EljakimHerrewijnen/Openwrt
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
dba1ec6535
Openwrt/target/linux/rb532-2.6/patches/510-Yaffs.patch

11287 lines
280 KiB
Diff
Raw Blame History

diff --git a/fs/Kconfig b/fs/Kconfig
index f9b5842..556f12a 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1022,6 +1022,15 @@ config EFS_FS
To compile the EFS file system support as a module, choose M here: the
module will be called efs.
+config YAFFS_FS
+ tristate "Yet Another Flash File System (YAFFS) support"
+ depends on MTD
+ help
+ JFFS is the Journaling Flash File System developed by Axis
+ Communications in Sweden, aimed at providing a crash/powerdown-safe
+ file system for disk-less embedded devices. Further information is
+ available at (<http://developer.axis.com/software/jffs/>).
+
config JFFS_FS
tristate "Journalling Flash File System (JFFS) support"
depends on MTD
diff --git a/fs/Makefile b/fs/Makefile
index 078d3d1..2062d2f 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -84,6 +85,7 @@ obj-$(CONFIG_UFS_FS) += ufs/
obj-$(CONFIG_EFS_FS) += efs/
obj-$(CONFIG_JFFS_FS) += jffs/
obj-$(CONFIG_JFFS2_FS) += jffs2/
+obj-$(CONFIG_YAFFS_FS) += yaffs/
obj-$(CONFIG_AFFS_FS) += affs/
obj-$(CONFIG_ROMFS_FS) += romfs/
obj-$(CONFIG_QNX4FS_FS) += qnx4/
diff --git a/fs/yaffs/Makefile b/fs/yaffs/Makefile
new file mode 100644
index 0000000..615c2b2
--- /dev/null
+++ b/fs/yaffs/Makefile
@@ -0,0 +1,18 @@
+#
+# Makefile for the Linux msdos filesystem routines.
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+# Note 2! The CFLAGS definitions are now in the main makefile.
+
+
+EXTRA_CFLAGS += -DCONFIG_YAFFS_YAFFS1 -DCONFIG_YAFFS_YAFFS2
+
+
+obj-$(CONFIG_YAFFS_FS) += yaffs.o
+
+yaffs-y = yaffs_fs.o yaffs_guts.o yaffs_mtdif.o yaffs_tagscompat.o \
+ yaffs_packedtags2.o yaffs_mtdif2.o yaffs_tagsvalidity.o \
+ yaffs_ecc.o
diff --git a/fs/yaffs/devextras.h b/fs/yaffs/devextras.h
new file mode 100644
index 0000000..752c2cc
--- /dev/null
+++ b/fs/yaffs/devextras.h
@@ -0,0 +1,271 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * devextras.h
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * This file is just holds extra declarations used during development.
+ * Most of these are from kernel includes placed here so we can use them in
+ * applications.
+ *
+ * $Id: devextras.h,v 1.1 2004/11/03 08:14:07 charles Exp $
+ *
+ */
+
+#ifndef __EXTRAS_H__
+#define __EXTRAS_H__
+
+#if defined WIN32
+#define __inline__ __inline
+#define new newHack
+#endif
+
+#if !(defined __KERNEL__) || (defined WIN32)
+
+// User space defines
+
+typedef unsigned char __u8;
+typedef unsigned short __u16;
+typedef unsigned __u32;
+
+
+/*
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ */
+
+ #define prefetch(x) 1
+
+
+struct list_head {
+ struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+ struct list_head name = LIST_HEAD_INIT(name)
+
+#define INIT_LIST_HEAD(ptr) do { \
+ (ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ void __list_add(struct list_head * new,
+ struct list_head * prev,
+ struct list_head * next)
+{
+ next->prev = new;
+ new->next = next;
+ new->prev = prev;
+ prev->next = new;
+}
+
+/**
+ * list_add - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ */
+static __inline__ void list_add(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head, head->next);
+}
+
+/**
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static __inline__ void list_add_tail(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ void __list_del(struct list_head * prev,
+ struct list_head * next)
+{
+ next->prev = prev;
+ prev->next = next;
+}
+
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty on entry does not return true after this, the entry is in an undefined state.
+ */
+static __inline__ void list_del(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+}
+
+/**
+ * list_del_init - deletes entry from list and reinitialize it.
+ * @entry: the element to delete from the list.
+ */
+static __inline__ void list_del_init(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+ INIT_LIST_HEAD(entry);
+}
+
+/**
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static __inline__ int list_empty(struct list_head *head)
+{
+ return head->next == head;
+}
+
+/**
+ * list_splice - join two lists
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static __inline__ void list_splice(struct list_head *list, struct list_head *head)
+{
+ struct list_head *first = list->next;
+
+ if (first != list) {
+ struct list_head *last = list->prev;
+ struct list_head *at = head->next;
+
+ first->prev = head;
+ head->next = first;
+
+ last->next = at;
+ at->prev = last;
+ }
+}
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr: the &struct list_head pointer.
+ * @type: the type of the struct this is embedded in.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+ ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+/**
+ * list_for_each - iterate over a list
+ * @pos: the &struct list_head to use as a loop counter.
+ * @head: the head for your list.
+ */
+#define list_for_each(pos, head) \
+ for (pos = (head)->next, prefetch(pos->next); pos != (head); \
+ pos = pos->next, prefetch(pos->next))
+
+/**
+ * list_for_each_safe - iterate over a list safe against removal of list entry
+ * @pos: the &struct list_head to use as a loop counter.
+ * @n: another &struct list_head to use as temporary storage
+ * @head: the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+ for (pos = (head)->next, n = pos->next; pos != (head); \
+ pos = n, n = pos->next)
+
+
+
+
+/*
+ * File types
+ */
+#define DT_UNKNOWN 0
+#define DT_FIFO 1
+#define DT_CHR 2
+#define DT_DIR 4
+#define DT_BLK 6
+#define DT_REG 8
+#define DT_LNK 10
+#define DT_SOCK 12
+#define DT_WHT 14
+
+#ifndef WIN32
+#include <sys/stat.h>
+#endif
+
+/*
+ * Attribute flags. These should be or-ed together to figure out what
+ * has been changed!
+ */
+#define ATTR_MODE 1
+#define ATTR_UID 2
+#define ATTR_GID 4
+#define ATTR_SIZE 8
+#define ATTR_ATIME 16
+#define ATTR_MTIME 32
+#define ATTR_CTIME 64
+#define ATTR_ATIME_SET 128
+#define ATTR_MTIME_SET 256
+#define ATTR_FORCE 512 /* Not a change, but a change it */
+#define ATTR_ATTR_FLAG 1024
+
+
+struct iattr {
+ unsigned int ia_valid;
+ unsigned ia_mode;
+ unsigned ia_uid;
+ unsigned ia_gid;
+ unsigned ia_size;
+ unsigned ia_atime;
+ unsigned ia_mtime;
+ unsigned ia_ctime;
+ unsigned int ia_attr_flags;
+};
+
+#define KERN_DEBUG
+
+
+#else
+
+#ifndef WIN32
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#endif
+
+#endif
+
+
+
+#if defined WIN32
+#undef new
+#endif
+
+#endif
+
diff --git a/fs/yaffs/yaffs_ecc.c b/fs/yaffs/yaffs_ecc.c
new file mode 100644
index 0000000..166bcad
--- /dev/null
+++ b/fs/yaffs/yaffs_ecc.c
@@ -0,0 +1,287 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * yaffs_ecc.c: ECC generation/correction algorithms.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ */
+
+ /*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
+ * blocks are used on a 512-byte NAND page.
+ *
+ */
+
+// Table generated by gen-ecc.c
+// Using a table means we do not have to calculate p1..p4 and p1'..p4'
+// for each byte of data. These are instead provided in a table in bits7..2.
+// Bit 0 of each entry indicates whether the entry has an odd or even parity, and therefore
+// this bytes influence on the line parity.
+
+const char *yaffs_ecc_c_version = "$Id: yaffs_ecc.c,v 1.4 2005/07/31 00:28:04 charles Exp $";
+
+#include "yportenv.h"
+
+#include "yaffs_ecc.h"
+
+static const unsigned char column_parity_table[] = {
+0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69, 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc, 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0, 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65, 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc, 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59, 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55, 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0, 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0, 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55, 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59, 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc, 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65, 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0, 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc, 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69, 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+};
+
+
+static int yaffs_CountBits(unsigned char x)
+{
+ int r = 0;
+ while(x)
+ {
+ if(x & 1) r++;
+ x >>= 1;
+ }
+ return r;
+}
+
+static int yaffs_CountBits32(unsigned x)
+{
+ int r = 0;
+ while(x)
+ {
+ if(x & 1) r++;
+ x >>= 1;
+ }
+ return r;
+}
+
+
+void yaffs_ECCCalculate(const unsigned char *data,unsigned char *ecc)
+{
+ unsigned int i;
+
+ unsigned char col_parity = 0;
+ unsigned char line_parity = 0;
+ unsigned char line_parity_prime = 0;
+ unsigned char t;
+ unsigned char b;
+
+ for(i = 0; i < 256; i++)
+ {
+ b = column_parity_table[*data++];
+ col_parity ^= b;
+
+ if(b & 0x01) // odd number of bits in the byte
+ {
+ line_parity ^= i;
+ line_parity_prime ^= ~i;
+ }
+
+ }
+
+ ecc[2] = (~col_parity) | 0x03;
+
+ t = 0;
+ if(line_parity & 0x80) t |= 0x80;
+ if(line_parity_prime & 0x80) t |= 0x40;
+ if(line_parity & 0x40) t |= 0x20;
+ if(line_parity_prime & 0x40) t |= 0x10;
+ if(line_parity & 0x20) t |= 0x08;
+ if(line_parity_prime & 0x20) t |= 0x04;
+ if(line_parity & 0x10) t |= 0x02;
+ if(line_parity_prime & 0x10) t |= 0x01;
+ ecc[1] = ~t;
+
+ t = 0;
+ if(line_parity & 0x08) t |= 0x80;
+ if(line_parity_prime & 0x08) t |= 0x40;
+ if(line_parity & 0x04) t |= 0x20;
+ if(line_parity_prime & 0x04) t |= 0x10;
+ if(line_parity & 0x02) t |= 0x08;
+ if(line_parity_prime & 0x02) t |= 0x04;
+ if(line_parity & 0x01) t |= 0x02;
+ if(line_parity_prime & 0x01) t |= 0x01;
+ ecc[0] = ~t;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+ // Swap the bytes into the wrong order
+ t = ecc[0];
+ ecc[0] = ecc[1];
+ ecc[1] = t;
+#endif
+}
+
+int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc, const unsigned char *test_ecc)
+{
+ unsigned char d0, d1, d2; // deltas
+
+ d0 = read_ecc[0] ^ test_ecc[0];
+ d1 = read_ecc[1] ^ test_ecc[1];
+ d2 = read_ecc[2] ^ test_ecc[2];
+
+
+
+ if((d0 | d1 | d2) == 0)
+ {
+ // no error
+ return 0;
+ }
+
+ if( ((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
+ ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
+ ((d2 ^ (d2 >> 1)) & 0x54) == 0x54)
+ {
+ // Single bit (recoverable) error in data
+
+ unsigned byte;
+ unsigned bit;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+ // swap the bytes to correct for the wrong order
+ unsigned char t;
+
+ t = d0;
+ d0 = d1;
+ d1 = t;
+#endif
+
+ bit = byte = 0;
+
+
+ if(d1 & 0x80) byte |= 0x80;
+ if(d1 & 0x20) byte |= 0x40;
+ if(d1 & 0x08) byte |= 0x20;
+ if(d1 & 0x02) byte |= 0x10;
+ if(d0 & 0x80) byte |= 0x08;
+ if(d0 & 0x20) byte |= 0x04;
+ if(d0 & 0x08) byte |= 0x02;
+ if(d0 & 0x02) byte |= 0x01;
+
+ if(d2 & 0x80) bit |= 0x04;
+ if(d2 & 0x20) bit |= 0x02;
+ if(d2 & 0x08) bit |= 0x01;
+
+ data[byte] ^= (1 << bit);
+
+ return 1;
+ }
+
+ if((yaffs_CountBits(d0)+yaffs_CountBits(d1)+yaffs_CountBits(d2)) == 1)
+ {
+ // Reccoverable error in ecc
+
+ read_ecc[0] = test_ecc[0];
+ read_ecc[1] = test_ecc[1];
+ read_ecc[2] = test_ecc[2];
+
+ return 1;
+ }
+
+ // Unrecoverable error
+
+ return -1;
+
+
+}
+
+
+
+void yaffs_ECCCalculateOther(const unsigned char *data,unsigned nBytes, yaffs_ECCOther *eccOther)
+{
+ unsigned int i;
+
+ unsigned char col_parity = 0;
+ unsigned line_parity = 0;
+ unsigned line_parity_prime = 0;
+ unsigned char b;
+
+ for(i = 0; i < nBytes; i++)
+ {
+ b = column_parity_table[*data++];
+ col_parity ^= b;
+
+ if(b & 0x01) // odd number of bits in the byte
+ {
+ line_parity ^= i;
+ line_parity_prime ^= ~i;
+ }
+
+ }
+
+ eccOther->colParity = (col_parity >> 2) & 0x3f;
+ eccOther->lineParity = line_parity;
+ eccOther->lineParityPrime = line_parity_prime;
+}
+
+int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes, yaffs_ECCOther *read_ecc, const yaffs_ECCOther *test_ecc)
+{
+ unsigned char cDelta; // column parity delta
+ unsigned lDelta; // line parity delta
+ unsigned lDeltaPrime; // line parity delta
+ unsigned bit;
+
+ cDelta = read_ecc->colParity ^ test_ecc->colParity;
+ lDelta = read_ecc->lineParity ^ test_ecc->lineParity;
+ lDeltaPrime = read_ecc->lineParityPrime ^ test_ecc->lineParityPrime;
+
+ if((cDelta | lDelta | lDeltaPrime) == 0)
+ {
+ // no error
+ return 0;
+ }
+
+ if( lDelta == ~lDeltaPrime &&
+ (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15)) // Not correct
+ {
+ // Single bit (recoverable) error in data
+
+ bit = 0;
+
+ if(cDelta & 0x20) bit |= 0x04;
+ if(cDelta & 0x08) bit |= 0x02;
+ if(cDelta & 0x02) bit |= 0x01;
+
+ data[lDelta] ^= (1 << bit);
+
+ return 1;
+ }
+
+ if((yaffs_CountBits32(lDelta) + yaffs_CountBits32(lDeltaPrime) + yaffs_CountBits(cDelta)) == 1)
+ {
+ // Reccoverable error in ecc
+
+ *read_ecc = *test_ecc;
+ return 1;
+ }
+
+ // Unrecoverable error
+
+ return -1;
+
+
+}
+
+
+
diff --git a/fs/yaffs/yaffs_ecc.h b/fs/yaffs/yaffs_ecc.h
new file mode 100644
index 0000000..f96d707
--- /dev/null
+++ b/fs/yaffs/yaffs_ecc.h
@@ -0,0 +1,41 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * yaffs_ecc.c: ECC generation/correction algorithms.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+ /*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
+ * blocks are used on a 512-byte NAND page.
+ *
+ */
+
+#ifndef __YAFFS_ECC_H__
+#define __YAFFS_ECC_H__
+
+typedef struct
+{
+ unsigned char colParity;
+ unsigned lineParity;
+ unsigned lineParityPrime;
+} yaffs_ECCOther;
+
+void yaffs_ECCCalculate(const unsigned char *data,unsigned char *ecc);
+int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc, const unsigned char *test_ecc);
+
+void yaffs_ECCCalculateOther(const unsigned char *data,unsigned nBytes, yaffs_ECCOther *ecc);
+int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes, yaffs_ECCOther *read_ecc, const yaffs_ECCOther *test_ecc);
+#endif
diff --git a/fs/yaffs/yaffs_fs.c b/fs/yaffs/yaffs_fs.c
new file mode 100644
index 0000000..717f41a
--- /dev/null
+++ b/fs/yaffs/yaffs_fs.c
@@ -0,0 +1,1727 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_fs.c
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This is the file system front-end to YAFFS that hooks it up to
+ * the VFS.
+ *
+ * Special notes:
+ * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with this superblock
+ * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this superblock
+ * >> inode->u.generic_ip points to the associated yaffs_Object.
+ *
+ *
+ * Acknowledgements:
+ * * Luc van OostenRyck for numerous patches.
+ * * Nick Bane for numerous patches.
+ * * Nick Bane for 2.5/2.6 integration.
+ * * Andras Toth for mknod rdev issue.
+ * * Michael Fischer for finding the problem with inode inconsistency.
+ * * Some code bodily lifted from JFFS2.
+ */
+
+
+const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.27 2005/08/04 22:47:36 luc Exp $";
+extern const char *yaffs_guts_c_version;
+
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+
+#include <linux/statfs.h> /* Added NCB 15-8-2003 */
+#include <asm/statfs.h>
+#define UnlockPage(p) unlock_page(p)
+#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
+#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) // FIXME: use sb->s_id instead ?
+
+#else
+
+#include <linux/locks.h>
+#define BDEVNAME_SIZE 0
+#define yaffs_devname(sb, buf) kdevname(sb->s_dev)
+
+#endif
+
+#include <asm/uaccess.h>
+
+#include "yportenv.h"
+#include "yaffs_guts.h"
+
+
+
+
+unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
+//unsigned yaffs_traceMask = 0xFFFFFFFF;
+
+
+#ifdef CONFIG_YAFFS_YAFFS1
+#include <linux/mtd/mtd.h>
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif2.h"
+#endif //CONFIG_YAFFS_YAFFS1
+
+//#define T(x) printk x
+
+
+
+#define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
+#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
+#else
+#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
+#endif
+
+
+static void yaffs_put_super(struct super_block *sb);
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
+
+static int yaffs_file_flush(struct file* file);
+
+static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
+static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
+static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
+#endif
+static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
+static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
+static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
+static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
+#endif
+static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
+#endif
+static void yaffs_read_inode (struct inode *inode);
+
+static void yaffs_put_inode (struct inode *inode);
+static void yaffs_delete_inode(struct inode *);
+static void yaffs_clear_inode(struct inode *);
+
+static int yaffs_readpage(struct file *file, struct page * page);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
+#else
+static int yaffs_writepage(struct page *page);
+#endif
+static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+
+
+
+static struct address_space_operations yaffs_file_address_operations = {
+ .readpage = yaffs_readpage,
+ .writepage = yaffs_writepage,
+ .prepare_write = yaffs_prepare_write,
+ .commit_write = yaffs_commit_write,
+};
+
+static struct file_operations yaffs_file_operations = {
+ .read = generic_file_read,
+ .write = generic_file_write,
+ .mmap = generic_file_mmap,
+ .flush = yaffs_file_flush,
+ .fsync = yaffs_sync_object,
+};
+
+static struct inode_operations yaffs_file_inode_operations = {
+ .setattr = yaffs_setattr,
+};
+
+static struct inode_operations yaffs_symlink_inode_operations = {
+ .readlink = yaffs_readlink,
+ .follow_link = yaffs_follow_link,
+ .setattr = yaffs_setattr,
+};
+
+static struct inode_operations yaffs_dir_inode_operations = {
+ .create = yaffs_create,
+ .lookup = yaffs_lookup,
+ .link = yaffs_link,
+ .unlink = yaffs_unlink,
+ .symlink = yaffs_symlink,
+ .mkdir = yaffs_mkdir,
+ .rmdir = yaffs_unlink,
+ .mknod = yaffs_mknod,
+ .rename = yaffs_rename,
+ .setattr = yaffs_setattr,
+};
+
+static struct file_operations yaffs_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = yaffs_readdir,
+ .fsync = yaffs_sync_object,
+};
+
+static struct super_operations yaffs_super_ops = {
+ .statfs = yaffs_statfs,
+ .read_inode = yaffs_read_inode,
+ .put_inode = yaffs_put_inode,
+ .put_super = yaffs_put_super,
+ .delete_inode = yaffs_delete_inode,
+ .clear_inode = yaffs_clear_inode,
+};
+
+
+
+static void yaffs_GrossLock(yaffs_Device *dev)
+{
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
+
+ down(&dev->grossLock);
+}
+
+static void yaffs_GrossUnlock(yaffs_Device *dev)
+{
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
+ up(&dev->grossLock);
+
+}
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
+{
+ unsigned char *alias;
+ int ret;
+
+ yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+
+ yaffs_GrossLock(dev);
+
+ alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+
+ yaffs_GrossUnlock(dev);
+
+ if(!alias)
+ return -ENOMEM;
+
+ ret = vfs_readlink(dentry, buffer, buflen, alias);
+ kfree(alias);
+ return ret;
+}
+
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ unsigned char *alias;
+ int ret;
+ yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+
+ yaffs_GrossLock(dev);
+
+ alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+
+ yaffs_GrossUnlock(dev);
+
+ if(!alias)
+ ret = -ENOMEM;
+ else {
+ ret = vfs_follow_link(nd,alias);
+ kfree(alias);
+ }
+ return ERR_PTR (ret);
+}
+
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
+
+/*
+ * Lookup is used to find objects in the fs
+ */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+
+static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
+#else
+static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
+#endif
+{
+ yaffs_Object *obj;
+ struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
+
+ yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
+
+
+ yaffs_GrossLock(dev);
+
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
+
+ obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
+
+ obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
+
+
+
+ if(obj)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
+
+ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode,0,obj);
+
+ if(inode)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
+/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
+#if 0
+ //dget(dentry); // try to solve directory bug
+ d_add(dentry,inode);
+
+ yaffs_GrossUnlock(dev);
+
+ // return dentry;
+ return NULL;
+#endif
+ }
+
+ }
+ else
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
+
+ }
+ yaffs_GrossUnlock(dev);
+
+/* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
+ d_add(dentry,inode);
+
+ return NULL;
+ // return (ERR_PTR(-EIO));
+
+}
+
+// For now put inode is just for debugging
+// Put inode is called when the inode **structure** is put.
+static void yaffs_put_inode(struct inode *inode)
+{
+ T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
+
+}
+
+// clear is called to tell the fs to release any per-inode data it holds
+static void yaffs_clear_inode(struct inode *inode)
+{
+ yaffs_Object *obj;
+ yaffs_Device *dev;
+
+ obj = yaffs_InodeToObject(inode);
+
+ T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object"));
+
+ if(obj)
+ {
+ dev = obj->myDev;
+ yaffs_GrossLock(dev);
+
+ // Clear the association between the inode ant the yaffs_Object.
+ obj->myInode = NULL;
+ inode->u.generic_ip = NULL;
+
+ // If the object freeing was deferred, then the real free happens now.
+ // This should fix the inode inconsistency problem.
+
+ yaffs_HandleDeferedFree(obj);
+
+ yaffs_GrossUnlock(dev);
+ }
+
+
+}
+
+// delete is called when the link count is zero and the inode
+// is put (ie. nobody wants to know about it anymore, time to
+// delete the file).
+// NB Must call clear_inode()
+static void yaffs_delete_inode(struct inode *inode)
+{
+ yaffs_Object *obj = yaffs_InodeToObject(inode);
+ yaffs_Device *dev;
+
+ T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object"));
+
+ if(obj)
+ {
+ dev = obj->myDev;
+ yaffs_GrossLock(dev);
+ yaffs_DeleteFile(obj);
+ yaffs_GrossUnlock(dev);
+ }
+ clear_inode(inode);
+}
+
+
+static int yaffs_file_flush(struct file* file)
+{
+ yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
+
+ yaffs_Device *dev = obj->myDev;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
+ obj->dirty ? "dirty" : "clean"));
+
+ yaffs_GrossLock(dev);
+
+ yaffs_FlushFile(obj,1);
+
+ yaffs_GrossUnlock(dev);
+
+ return 0;
+}
+
+
+
+static int yaffs_readpage_nolock(struct file *f, struct page * pg)
+{
+ // Lifted from jffs2
+
+ yaffs_Object *obj;
+ unsigned char *pg_buf;
+ int ret;
+
+ yaffs_Device *dev;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
+ (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
+
+ obj = yaffs_DentryToObject(f->f_dentry);
+
+ dev = obj->myDev;
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+ BUG_ON(!PageLocked(pg));
+#else
+ if (!PageLocked(pg))
+ PAGE_BUG(pg);
+#endif
+
+ pg_buf = kmap(pg);
+ /* FIXME: Can kmap fail? */
+
+ yaffs_GrossLock(dev);
+
+ ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
+
+ yaffs_GrossUnlock(dev);
+
+ if(ret >= 0) ret = 0;
+
+ if (ret) {
+ ClearPageUptodate(pg);
+ SetPageError(pg);
+ } else {
+ SetPageUptodate(pg);
+ ClearPageError(pg);
+ }
+
+ flush_dcache_page(pg);
+ kunmap(pg);
+
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
+ return ret;
+}
+
+static int yaffs_readpage_unlock(struct file *f, struct page *pg)
+{
+ int ret = yaffs_readpage_nolock(f,pg);
+ UnlockPage(pg);
+ return ret;
+}
+
+static int yaffs_readpage(struct file *f, struct page * pg)
+{
+ return yaffs_readpage_unlock(f,pg);
+}
+
+// writepage inspired by/stolen from smbfs
+//
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
+#else
+static int yaffs_writepage(struct page *page)
+#endif
+{
+ struct address_space *mapping = page->mapping;
+ loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
+ struct inode *inode;
+ unsigned long end_index;
+ char *buffer;
+ yaffs_Object *obj;
+ int nWritten = 0;
+ unsigned nBytes;
+
+ if (!mapping)
+ BUG();
+ inode = mapping->host;
+ if (!inode)
+ BUG();
+
+ if (offset > inode->i_size)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_writepage at %08x, inode size = %08x!!!\n", (unsigned)(page->index << PAGE_CACHE_SHIFT), (unsigned) inode->i_size));
+ T(YAFFS_TRACE_OS,(KERN_DEBUG" -> don't care!!\n"));
+ unlock_page(page);
+ return 0;
+ }
+
+ end_index = inode->i_size >> PAGE_CACHE_SHIFT;
+
+ /* easy case */
+ if (page->index < end_index)
+ {
+ nBytes = PAGE_CACHE_SIZE;
+ }
+ else
+ {
+ nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
+ }
+ // What's happening here?
+ ///* OK, are we completely out? */
+ //if (page->index >= end_index+1 || !offset)
+ // return -EIO;
+
+ get_page(page);
+
+
+ buffer = kmap(page);
+
+ obj = yaffs_InodeToObject(inode);
+ yaffs_GrossLock(obj->myDev);
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_writepage at %08x, size %08x\n", (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"writepag0: obj = %05x, ino = %05x\n", (int) obj->variant.fileVariant.fileSize, (int) inode->i_size));
+
+ nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes,0);
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"writepag1: obj = %05x, ino = %05x\n", (int) obj->variant.fileVariant.fileSize, (int) inode->i_size));
+
+ yaffs_GrossUnlock(obj->myDev);
+
+ kunmap(page);
+ SetPageUptodate(page);
+ UnlockPage(page);
+ put_page(page);
+
+ return (nWritten == nBytes) ? 0 : -ENOSPC;
+}
+
+
+
+static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
+{
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
+ if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
+ return yaffs_readpage_nolock(f,pg);
+
+ return 0;
+
+}
+
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
+{
+
+ void *addr = page_address(pg) + offset;
+ loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
+ int nBytes = to - offset;
+ int nWritten;
+
+ unsigned spos = pos;
+ unsigned saddr = (unsigned)addr;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
+
+ nWritten = yaffs_file_write(f,addr, nBytes, &pos);
+
+ if(nWritten != nBytes)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d nBytes %d\n",nWritten,nBytes));
+ SetPageError(pg);
+ ClearPageUptodate(pg);
+ }
+ else
+ {
+ SetPageUptodate(pg);
+ }
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
+
+ return nWritten;
+
+}
+
+
+
+static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
+{
+ if (inode && obj)
+ {
+ inode->i_ino = obj->objectId;
+ inode->i_mode = obj->yst_mode;
+ inode->i_uid = obj->yst_uid;
+ inode->i_gid = obj->yst_gid;
+ inode->i_blksize = inode->i_sb->s_blocksize;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+
+ inode->i_rdev = old_decode_dev(obj->yst_rdev);
+ inode->i_atime.tv_sec = (time_t)(obj->yst_atime);
+ inode->i_atime.tv_nsec = 0;
+ inode->i_mtime.tv_sec = (time_t)obj->yst_mtime;
+ inode->i_mtime.tv_nsec =0;
+ inode->i_ctime.tv_sec = (time_t)obj->yst_ctime;
+ inode->i_ctime.tv_nsec = 0;
+#else
+ inode->i_rdev = obj->yst_rdev;
+ inode->i_atime = obj->yst_atime;
+ inode->i_mtime = obj->yst_mtime;
+ inode->i_ctime = obj->yst_ctime;
+#endif
+ inode->i_size = yaffs_GetObjectFileLength(obj);
+ inode->i_blocks = (inode->i_size + 511) >> 9;
+
+ inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
+ inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
+
+ switch (obj->yst_mode & S_IFMT)
+ {
+ default: // fifo, device or socket
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+ init_special_inode(inode, obj->yst_mode,old_decode_dev(obj->yst_rdev));
+#else
+ init_special_inode(inode, obj->yst_mode,(dev_t)(obj->yst_rdev));
+#endif
+ break;
+ case S_IFREG: // file
+ inode->i_op = &yaffs_file_inode_operations;
+ inode->i_fop = &yaffs_file_operations;
+ inode->i_mapping->a_ops = &yaffs_file_address_operations;
+ break;
+ case S_IFDIR: // directory
+ inode->i_op = &yaffs_dir_inode_operations;
+ inode->i_fop = &yaffs_dir_operations;
+ break;
+ case S_IFLNK: // symlink
+ inode->i_op = &yaffs_symlink_inode_operations;
+ break;
+ }
+
+
+ inode->u.generic_ip = obj;
+ obj->myInode = inode;
+
+ }
+ else
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
+ }
+
+}
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
+{
+ struct inode * inode;
+
+ if(!sb)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
+ return NULL;
+
+ }
+
+ if(!obj)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
+ return NULL;
+
+ }
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
+
+ inode = iget(sb,obj->objectId);
+
+ // NB Side effect: iget calls back to yaffs_read_inode().
+ // iget also increments the inode's i_count
+
+ return inode;
+}
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
+{
+ yaffs_Object *obj;
+ int nWritten,ipos;
+ struct inode *inode;
+ yaffs_Device *dev;
+
+
+ obj = yaffs_DentryToObject(f->f_dentry);
+
+ dev = obj->myDev;
+
+ yaffs_GrossLock(dev);
+
+ inode = f->f_dentry->d_inode;
+
+ if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
+ {
+ ipos = inode->i_size;
+ }
+ else
+ {
+ ipos = *pos;
+ }
+
+
+ if(!obj)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
+ }
+ else
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos));
+ }
+
+ nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n,0);
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
+ if(nWritten > 0)
+ {
+ ipos += nWritten;
+ *pos = ipos;
+ if(ipos > inode->i_size)
+ {
+ inode->i_size = ipos;
+ inode->i_blocks = (ipos + 511)>>9;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
+ }
+
+ }
+ yaffs_GrossUnlock(dev);
+
+ return nWritten != n ? -ENOSPC : nWritten;
+}
+
+
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+ yaffs_Object *obj;
+ yaffs_Device *dev;
+ struct inode *inode = f->f_dentry->d_inode;
+ unsigned long offset, curoffs;
+ struct list_head *i;
+ yaffs_Object *l;
+
+ char name[YAFFS_MAX_NAME_LENGTH +1];
+
+ obj = yaffs_DentryToObject(f->f_dentry);
+ dev = obj->myDev;
+
+ yaffs_GrossLock(dev);
+
+ offset = f->f_pos;
+
+ T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
+
+ if(offset == 0)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
+ if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
+ {
+ goto out;
+ }
+ offset++;
+ f->f_pos++;
+ }
+ if(offset == 1)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
+ if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
+ {
+ goto out;
+ }
+ offset++;
+ f->f_pos++;
+ }
+
+ curoffs = 1;
+
+ list_for_each(i,&obj->variant.directoryVariant.children)
+ {
+ curoffs++;
+ if(curoffs >= offset)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+
+ yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
+
+ if(filldir(dirent,
+ name,
+ strlen(name),
+ offset,
+ yaffs_GetObjectInode(l),
+ yaffs_GetObjectType(l))
+ < 0)
+ {
+ goto up_and_out;
+ }
+
+ offset++;
+ f->f_pos++;
+ }
+ }
+
+ up_and_out:
+ out:
+
+ yaffs_GrossUnlock(dev);
+
+ return 0;
+}
+
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
+#endif
+{
+ struct inode *inode;
+
+ yaffs_Object *obj = NULL;
+ yaffs_Device *dev;
+
+ yaffs_Object *parent = yaffs_InodeToObject(dir);
+
+ int error = -ENOSPC;
+ uid_t uid = current->fsuid;
+ gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
+
+ if(parent)
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
+ parent->objectId,parent->variantType));
+ }
+ else
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
+ return -EPERM;
+ }
+
+ T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
+ dentry->d_name.name, mode,rdev));
+
+ dev = parent->myDev;
+
+ yaffs_GrossLock(dev);
+
+ switch (mode & S_IFMT)
+ {
+ default:
+ // Special (socket, fifo, device...)
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+ obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,uid, gid,old_encode_dev(rdev));
+#else
+ obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,uid, gid,rdev);
+#endif
+ break;
+ case S_IFREG: // file
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
+ obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,uid, gid);
+ break;
+ case S_IFDIR: // directory
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
+ obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,uid, gid);
+ break;
+ case S_IFLNK: // symlink
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
+ obj = NULL; // Do we ever get here?
+ break;
+ }
+
+ if(obj)
+ {
+ inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+ d_instantiate(dentry, inode);
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
+ error = 0;
+ }
+ else
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
+ error = -ENOMEM;
+ }
+
+ yaffs_GrossUnlock(dev);
+
+ return error;
+}
+
+static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
+{
+ int retVal;
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
+ retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+#if 0
+ // attempt to fix dir bug - didn't work
+ if(!retVal)
+ {
+ dget(dentry);
+ }
+#endif
+ return retVal;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
+ return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+
+static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
+{
+ int retVal;
+
+ yaffs_Device *dev;
+
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
+
+ dev = yaffs_InodeToObject(dir)->myDev;
+
+ yaffs_GrossLock(dev);
+
+
+ retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
+
+
+ yaffs_GrossUnlock(dev);
+
+ if( retVal == YAFFS_OK)
+ {
+ dentry->d_inode->i_nlink--;
+ mark_inode_dirty(dentry->d_inode);
+ return 0;
+ }
+ else
+ {
+ return -ENOTEMPTY;
+ }
+}
+
+
+/*
+ * Create a link...
+ */
+static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
+{
+ struct inode *inode = old_dentry->d_inode;
+ yaffs_Object *obj = NULL;
+ yaffs_Object *link=NULL;
+ yaffs_Device *dev;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
+
+ obj = yaffs_InodeToObject(inode);
+ dev = obj->myDev;
+
+ yaffs_GrossLock(dev);
+
+ if (!S_ISDIR(inode->i_mode)) // Don't link directories
+ {
+ link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
+ }
+
+
+ if(link)
+ {
+ old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+ d_instantiate(dentry, old_dentry->d_inode);
+ atomic_inc(&old_dentry->d_inode->i_count);
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
+ old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
+
+ }
+
+ yaffs_GrossUnlock(dev);
+
+
+ if(link)
+ {
+
+ return 0;
+ }
+
+
+ return -EPERM;
+}
+
+
+static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
+{
+ yaffs_Object *obj;
+ yaffs_Device *dev;
+ uid_t uid = current->fsuid;
+ gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
+
+ dev = yaffs_InodeToObject(dir)->myDev;
+ yaffs_GrossLock(dev);
+ obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
+ S_IFLNK | S_IRWXUGO, uid, gid,
+ symname);
+ yaffs_GrossUnlock(dev);
+
+ if(obj)
+ {
+
+ struct inode* inode;
+
+ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+ d_instantiate(dentry, inode);
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
+ return 0;
+ }
+ else
+ {
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
+
+ }
+
+ return -ENOMEM;
+}
+
+static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
+{
+
+ yaffs_Object *obj;
+ yaffs_Device *dev;
+
+ obj = yaffs_DentryToObject(dentry);
+
+ dev = obj->myDev;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
+ yaffs_GrossLock(dev);
+ yaffs_FlushFile(obj,1);
+ yaffs_GrossUnlock(dev);
+ return 0;
+}
+
+/*
+ * The VFS layer already does all the dentry stuff for rename.
+ *
+ * NB: POSIX says you can rename an object over an old object of the same name
+ */
+static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
+{
+ yaffs_Device *dev;
+ int retVal = YAFFS_FAIL;
+ int removed = 0;
+ yaffs_Object *target;
+
+ dev = yaffs_InodeToObject(old_dir)->myDev;
+
+ yaffs_GrossLock(dev);
+
+ // Check if the target is an existing directory that is not empty.
+ target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
+
+ if(target &&
+ target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+ !list_empty(&target->variant.directoryVariant.children))
+ {
+ retVal = YAFFS_FAIL;
+ }
+ else
+ {
+
+ // Unlink the target if it exists
+ removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
+
+
+ retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
+ yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
+
+ }
+ yaffs_GrossUnlock(dev);
+
+ if(retVal == YAFFS_OK)
+ {
+ if(removed == YAFFS_OK)
+ {
+ new_dentry->d_inode->i_nlink--;
+ mark_inode_dirty(new_dentry->d_inode);
+ }
+
+ return 0;
+ }
+ else
+ {
+ return -ENOTEMPTY;
+ }
+
+
+}
+
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+ yaffs_Device *dev;
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
+
+ if((error = inode_change_ok(inode,attr)) == 0)
+ {
+
+ dev = yaffs_InodeToObject(inode)->myDev;
+ yaffs_GrossLock(dev);
+ if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
+ {
+ error = 0;
+ }
+ else
+ {
+ error = -EPERM;
+ }
+ yaffs_GrossUnlock(dev);
+ if (!error)
+ error = inode_setattr(inode,attr);
+ }
+ return error;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
+#endif
+{
+
+
+ yaffs_Device *dev = yaffs_SuperToDevice(sb);
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
+
+ yaffs_GrossLock(dev);
+
+
+ buf->f_type = YAFFS_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_namelen = 255;
+ if(sb->s_blocksize > dev->nBytesPerChunk)
+ {
+
+ buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock/
+ (sb->s_blocksize/dev->nBytesPerChunk);
+ buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
+ (sb->s_blocksize/dev->nBytesPerChunk);
+ }
+ else
+ {
+
+ buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock *
+ (dev->nBytesPerChunk/sb->s_blocksize);
+ buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) *
+ (dev->nBytesPerChunk/sb->s_blocksize);
+ }
+ buf->f_files = 0;
+ buf->f_ffree = 0;
+ buf->f_bavail = buf->f_bfree;
+
+ yaffs_GrossUnlock(dev);
+ return 0;
+}
+
+static void yaffs_read_inode (struct inode *inode)
+{
+ // NB This is called as a side effect of other functions and
+ // thus gross locking should always be in place already.
+
+ yaffs_Object *obj ;
+ yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
+
+ T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
+
+ obj = yaffs_FindObjectByNumber(dev,inode->i_ino);
+
+ yaffs_FillInodeFromObject(inode,obj);
+
+}
+
+static LIST_HEAD(yaffs_dev_list);
+
+static void yaffs_put_super(struct super_block *sb)
+{
+ yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+ yaffs_GrossLock(dev);
+ if(dev->putSuperFunc)
+ {
+ dev->putSuperFunc(sb);
+ }
+ yaffs_Deinitialise(dev);
+ yaffs_GrossUnlock(dev);
+
+ /* we assume this is protected by lock_kernel() in mount/umount */
+ list_del(&dev->devList);
+
+ kfree(dev);
+}
+
+
+#ifdef CONFIG_YAFFS_YAFFS1
+
+static void yaffs_MTDPutSuper(struct super_block *sb)
+{
+
+ struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
+
+ if(mtd->sync)
+ {
+ mtd->sync(mtd);
+ }
+
+ put_mtd_device(mtd);
+}
+
+#endif
+
+
+static struct super_block *yaffs_internal_read_super(int yaffsVersion, struct super_block * sb, void * data, int silent)
+{
+ int nBlocks;
+ struct inode * inode = NULL;
+ struct dentry * root;
+ yaffs_Device *dev = 0;
+ char devname_buf[BDEVNAME_SIZE+1];
+ struct mtd_info *mtd;
+ int err;
+
+ sb->s_magic = YAFFS_MAGIC;
+ sb->s_op = &yaffs_super_ops;
+
+ if(!sb)
+ printk(KERN_INFO"yaffs: sb is NULL\n");
+ else if(!sb->s_dev)
+ printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
+ else if(!yaffs_devname(sb, devname_buf))
+ printk(KERN_INFO"yaffs: devname is NULL\n");
+ else
+ printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, yaffs_devname(sb, devname_buf));
+
+
+
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
+ T(YAFFS_TRACE_OS,("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
+
+#ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
+ T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
+#endif
+
+
+ T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
+ MAJOR(sb->s_dev),MINOR(sb->s_dev), yaffs_devname(sb, devname_buf)));
+
+ // Check it's an mtd device.....
+ if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
+ {
+ return NULL; // This isn't an mtd device
+ }
+
+ // Get the device
+ mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+ if (!mtd)
+ {
+ T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
+ return NULL;
+ }
+
+ // Check it's NAND
+ if(mtd->type != MTD_NANDFLASH)
+ {
+ T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
+ return NULL;
+ }
+
+ T(YAFFS_TRACE_OS,(" erase %p\n",mtd->erase));
+ T(YAFFS_TRACE_OS,(" read %p\n",mtd->read));
+ T(YAFFS_TRACE_OS,(" write %p\n",mtd->write));
+ T(YAFFS_TRACE_OS,(" readoob %p\n",mtd->read_oob));
+ T(YAFFS_TRACE_OS,(" writeoob %p\n",mtd->write_oob));
+// T(YAFFS_TRACE_OS,(" block_isbad %p\n",mtd->block_isbad));
+// T(YAFFS_TRACE_OS,(" block_markbad %p\n",mtd->block_markbad));
+ T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
+ T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
+ T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
+ T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
+
+ if(yaffsVersion == 2)
+ {
+ // Check for version 2 style functions
+ if(!mtd->erase ||
+// !mtd->block_isbad ||
+// !mtd->block_markbad ||
+ !mtd->read ||
+ !mtd->write ||
+ !mtd->write_ecc ||
+ !mtd->read_ecc ||
+ !mtd->read_oob ||
+ !mtd->write_oob )
+ {
+ T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
+ return NULL;
+ }
+
+ if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+ mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
+ {
+ T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
+ return NULL;
+ } }
+ else
+ {
+ // Check for V1 style functions
+ if(!mtd->erase ||
+ !mtd->read ||
+ !mtd->write ||
+ !mtd->write_ecc ||
+ !mtd->read_ecc ||
+ !mtd->read_oob ||
+ !mtd->write_oob )
+ {
+ T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
+ return NULL;
+ }
+
+ if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
+ mtd->oobsize != YAFFS_BYTES_PER_SPARE)
+ {
+ T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
+ return NULL;
+ }
+ }
+
+
+ // OK, so if we got here, we have an MTD that's NAND and looks
+ // like it has the right capabilities
+ // Set the yaffs_Device up for mtd
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+ sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
+#else
+ sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
+#endif
+ if(!dev)
+ {
+ // Deep shit could not allocate device structure
+ T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
+ return NULL;
+ }
+
+ memset(dev,0,sizeof(yaffs_Device));
+ dev->genericDevice = mtd;
+ dev->name = mtd->name;
+
+ // Set up the memory size parameters....
+
+ nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
+ dev->startBlock = 0;
+ dev->endBlock = nBlocks - 1;
+ dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
+ dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
+ dev->nReservedBlocks = 5;
+ dev->nShortOpCaches = 10; // Enable short op caching
+
+
+ // ... and the functions.
+ if(yaffsVersion == 2)
+ {
+ dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
+ dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
+ dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
+ dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
+ dev->spareBuffer = YMALLOC(mtd->oobsize);
+ dev->isYaffs2 = 1;
+ dev->nBytesPerChunk = mtd->oobblock;
+ dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
+ nBlocks = mtd->size / mtd->erasesize;
+ dev->startBlock = 0;
+ dev->endBlock = nBlocks - 1;
+ }
+ else
+ {
+ dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
+ dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
+ dev->isYaffs2 = 0;
+ }
+ // ... and common functions
+ dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
+ dev->initialiseNAND = nandmtd_InitialiseNAND;
+
+ dev->putSuperFunc = yaffs_MTDPutSuper;
+
+#ifndef CONFIG_YAFFS_DOES_ECC
+ dev->useNANDECC = 1;
+#endif
+
+ /* we assume this is protected by lock_kernel() in mount/umount */
+ list_add_tail(&dev->devList, &yaffs_dev_list);
+
+ init_MUTEX(&dev->grossLock);
+
+
+ yaffs_GrossLock(dev);
+
+ err = yaffs_GutsInitialise(dev);
+
+ T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
+
+ // Create root inode
+ if(err == YAFFS_OK)
+ inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
+
+ yaffs_GrossUnlock(dev);
+
+ if (!inode)
+ return NULL;
+
+// added NCB
+ inode->i_op = & yaffs_dir_inode_operations;
+ inode->i_fop = & yaffs_dir_operations;
+
+ T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
+
+
+ root = d_alloc_root(inode);
+
+ T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
+
+ if (!root) {
+ iput(inode);
+ return NULL;
+ }
+ sb->s_root = root;
+
+ T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
+ return sb;
+}
+
+
+
+#ifdef CONFIG_YAFFS_YAFFS1
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
+{
+ return yaffs_internal_read_super(1,sb,data,silent) ? 0 : -1;
+}
+
+static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
+{
+
+ return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
+}
+
+static struct file_system_type yaffs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "yaffs",
+ .get_sb = yaffs_read_super,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
+{
+ return yaffs_internal_read_super(1,sb,data,silent);
+}
+
+static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
+#endif
+
+#endif // CONFIG_YAFFS_YAFFS1
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
+{
+ return yaffs_internal_read_super(2,sb,data,silent) ? 0 : -1;
+}
+
+static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
+{
+
+ return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
+}
+
+static struct file_system_type yaffs2_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "yaffs2",
+ .get_sb = yaffs2_read_super,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
+{
+ return yaffs_internal_read_super(2,sb,data,silent);
+}
+
+static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
+#endif
+
+#endif // CONFIG_YAFFS_YAFFS2
+
+
+
+
+static struct proc_dir_entry *my_proc_entry;
+
+static char * yaffs_dump_dev(char *buf,yaffs_Device *dev)
+{
+ buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
+ buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
+ buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
+ buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
+ buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
+ buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
+ buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
+ buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
+ buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
+ buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
+ buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
+ buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
+ buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
+ buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
+ buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
+ buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
+ buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
+ buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
+ buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
+ buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
+ buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
+ buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
+ buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
+ buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
+ buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
+ buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
+ buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
+ buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
+
+ return buf;
+}
+
+static int yaffs_proc_read(
+ char *page,
+ char **start,
+ off_t offset,
+ int count,
+ int *eof,
+ void *data
+ )
+{
+ struct list_head *item;
+ char *buf = page;
+ int step = offset;
+ int n = 0;
+
+ /* Get proc_file_read() to step 'offset' by one on each sucessive call.
+ * We use 'offset' (*ppos) to indicate where we are in devList.
+ * This also assumes the user has posted a read buffer large
+ * enough to hold the complete output; but that's life in /proc.
+ */
+
+ *(int *)start = 1;
+
+ /* Print header first */
+ if (step == 0) {
+ buf += sprintf(buf, "YAFFS built:" __DATE__ " "__TIME__
+ "\n%s\n%s\n", yaffs_fs_c_version, yaffs_guts_c_version);
+ }
+
+ /* hold lock_kernel while traversing yaffs_dev_list */
+ lock_kernel();
+
+ /* Locate and print the Nth entry. Order N-squared but N is small. */
+ list_for_each(item, &yaffs_dev_list) {
+ yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
+ if (n < step) {
+ n++;
+ continue;
+ }
+ buf += sprintf(buf,"\nDevice %d \"%s\"\n", n, dev->name);
+ buf = yaffs_dump_dev(buf, dev);
+ break;
+ }
+ unlock_kernel();
+
+ return buf-page < count ? buf-page : count;
+}
+
+// Stuff to handle installation of file systems
+struct file_system_to_install
+{
+ struct file_system_type *fst;
+ int installed;
+};
+
+static struct file_system_to_install fs_to_install[] =
+{
+#ifdef CONFIG_YAFFS_YAFFS1
+ { &yaffs_fs_type,0},
+#endif
+#ifdef CONFIG_YAFFS_YAFFS2
+ { &yaffs2_fs_type,0},
+#endif
+ { NULL,0}
+};
+
+static int __init init_yaffs_fs(void)
+{
+ int error = 0;
+ struct file_system_to_install *fsinst;
+
+ T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
+
+
+
+ /* Install the proc_fs entry */
+ my_proc_entry = create_proc_read_entry("yaffs",
+ S_IRUGO | S_IFREG,
+ &proc_root,
+ yaffs_proc_read,
+ NULL);
+ if(!my_proc_entry)
+ {
+ return -ENOMEM;
+ }
+
+
+
+ // Now add the file system entries
+
+ fsinst = fs_to_install;
+
+ while(fsinst->fst && !error)
+ {
+ error = register_filesystem(fsinst->fst);
+ if(!error)
+ {
+ fsinst->installed = 1;
+ }
+ fsinst++;
+ }
+
+ // Any errors? uninstall
+ if(error)
+ {
+ fsinst = fs_to_install;
+
+ while(fsinst->fst)
+ {
+ if(fsinst->installed)
+ {
+ unregister_filesystem(fsinst->fst);
+ fsinst->installed = 0;
+ }
+ fsinst++;
+ }
+ }
+
+ return error;
+}
+
+static void __exit exit_yaffs_fs(void)
+{
+
+ struct file_system_to_install *fsinst;
+
+ T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
+
+ remove_proc_entry("yaffs",&proc_root);
+
+ fsinst = fs_to_install;
+
+ while(fsinst->fst)
+ {
+ if(fsinst->installed)
+ {
+ unregister_filesystem(fsinst->fst);
+ fsinst->installed = 0;
+ }
+ fsinst++;
+ }
+
+}
+
+module_init(init_yaffs_fs)
+module_exit(exit_yaffs_fs)
+
+MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
+MODULE_LICENSE("GPL");
+
+
diff --git a/fs/yaffs/yaffs_guts.c b/fs/yaffs/yaffs_guts.c
new file mode 100644
index 0000000..bf13f91
--- /dev/null
+++ b/fs/yaffs/yaffs_guts.c
@@ -0,0 +1,6346 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+ //yaffs_guts.c
+
+const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.15 2005/08/02 04:24:22 charles Exp $";
+
+#include "yportenv.h"
+
+#include "yaffsinterface.h"
+#include "yaffs_guts.h"
+#include "yaffs_tagsvalidity.h"
+
+
+#include "yaffs_tagscompat.h"
+
+#ifdef CONFIG_YAFFS_WINCE
+void yfsd_LockYAFFS(BOOL fsLockOnly);
+void yfsd_UnlockYAFFS(BOOL fsLockOnly);
+#endif
+
+#define YAFFS_PASSIVE_GC_CHUNKS 2
+
+#if 0
+// Use Steven Hill's ECC struff instead
+// External functions for ECC on data
+void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
+int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
+#define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc)
+#define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc)
+#else
+#include "yaffs_ecc.h"
+#endif
+
+#if 0
+// countBits is a quick way of counting the number of bits in a byte.
+// ie. countBits[n] holds the number of 1 bits in a byte with the value n.
+
+static const char yaffs_countBitsTable[256] =
+{
+0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
+};
+
+static int yaffs_CountBits(__u8 x)
+{
+ int retVal;
+ retVal = yaffs_countBitsTable[x];
+ return retVal;
+}
+
+#endif
+
+
+#if 0
+// Stuff using yea olde tags
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
+static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
+
+static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
+static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
+#else
+#endif
+
+// NAND access
+
+
+static Y_INLINE int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags);
+static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
+static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo);
+static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state,unsigned *sequenceNumber);
+// Local prototypes
+static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve);
+#if 0
+static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
+#endif
+static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);
+
+static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type);
+static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj);
+static int yaffs_UpdateObjectHeader(yaffs_Object *in,const YCHAR *name, int force,int isShrink, int shadows);
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
+static int yaffs_CheckStructures(void);
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit);
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
+
+static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);
+
+static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo);
+static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo);
+
+
+// Robustification (if it ever comes about...)
+static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
+#if 0
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
+#endif
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags);
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_ExtendedTags *tags);
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
+
+static int yaffs_UnlinkWorker(yaffs_Object *obj);
+static void yaffs_DestroyObject(yaffs_Object *obj);
+
+#if 0
+static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize);
+#endif
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject);
+
+
+loff_t yaffs_GetFileSize(yaffs_Object *obj);
+
+
+static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);
+
+static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
+
+#ifdef YAFFS_PARANOID
+static int yaffs_CheckFileSanity(yaffs_Object *in);
+#else
+#define yaffs_CheckFileSanity(in)
+#endif
+
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
+static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
+
+static int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags)
+{
+ chunkInNAND -= dev->chunkOffset;
+
+ if(dev->readChunkWithTagsFromNAND)
+ return dev->readChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
+ else
+ return yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
+}
+
+static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_ExtendedTags *tags)
+{
+ chunkInNAND -= dev->chunkOffset;
+
+ if(tags)
+ {
+ tags->sequenceNumber = dev->sequenceNumber;
+ tags->chunkUsed = 1;
+ if(!yaffs_ValidateTags(tags))
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("Writing uninitialised tags" TENDSTR)));
+ YBUG();
+ }
+ T(YAFFS_TRACE_WRITE,(TSTR("Writing chunk %d tags %d %d"TENDSTR),chunkInNAND,tags->objectId,tags->chunkId));
+ }
+ else
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("Writing with no tags" TENDSTR)));
+ YBUG();
+ }
+
+ if(dev->writeChunkWithTagsToNAND)
+ return dev->writeChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
+ else
+ return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
+}
+
+static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
+{
+ blockNo -= dev->blockOffset;
+
+ if(dev->markNANDBlockBad)
+ return dev->markNANDBlockBad(dev,blockNo);
+ else
+ return yaffs_TagsCompatabilityMarkNANDBlockBad(dev,blockNo);
+}
+static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state, unsigned *sequenceNumber)
+{
+ blockNo -= dev->blockOffset;
+
+ if(dev->queryNANDBlock)
+ return dev->queryNANDBlock(dev,blockNo,state,sequenceNumber);
+ else
+ return yaffs_TagsCompatabilityQueryNANDBlock(dev,blockNo,state,sequenceNumber);
+}
+
+static int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
+{
+ int result;
+
+ blockInNAND -= dev->blockOffset;
+
+ dev->nBlockErasures++;
+ result = dev->eraseBlockInNAND(dev,blockInNAND);
+
+ if(!result)result = dev->eraseBlockInNAND(dev,blockInNAND); // If at first we don't succeed, try again *once*.
+ return result;
+}
+
+static int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
+{
+ return dev->initialiseNAND(dev);
+}
+
+
+
+
+// Temporary buffer manipulations
+
+static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo)
+{
+ int i,j;
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ if(dev->tempBuffer[i].line == 0)
+ {
+ dev->tempBuffer[i].line = lineNo;
+ if((i+1) > dev->maxTemp)
+ {
+ dev->maxTemp = i + 1;
+ for(j = 0; j <= i; j++)
+ dev->tempBuffer[j].maxLine = dev->tempBuffer[j].line;
+ }
+
+ return dev->tempBuffer[i].buffer;
+ }
+ }
+
+ T(YAFFS_TRACE_BUFFERS,(TSTR("Out of temp buffers at line %d, other held by lines:"),lineNo));
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ T(YAFFS_TRACE_BUFFERS,(TSTR(" %d "),dev->tempBuffer[i].line));
+ }
+ T(YAFFS_TRACE_BUFFERS,(TSTR(" "TENDSTR)));
+
+ dev->unmanagedTempAllocations++;
+ // Get an unmanaged one
+ return YMALLOC(dev->nBytesPerChunk);
+
+
+}
+
+static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo)
+{
+ int i;
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ if(dev->tempBuffer[i].buffer == buffer)
+ {
+ dev->tempBuffer[i].line = 0;
+ return;
+ }
+ }
+
+ if(buffer)
+ {
+ // assume it is an unmanaged one.
+ T(YAFFS_TRACE_BUFFERS,(TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),lineNo));
+ YFREE(buffer);
+ dev->unmanagedTempDeallocations++;
+ }
+
+}
+
+
+// Chunk bitmap manipulations
+
+static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
+{
+ if(blk < dev->internalStartBlock || blk > dev->internalEndBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),blk));
+ YBUG();
+ }
+ return dev->chunkBits + (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+}
+
+static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev,int blk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+
+ memset(blkBits,0,dev->chunkBitmapStride);
+}
+
+static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+
+ blkBits[chunk/8] &= ~ (1<<(chunk & 7));
+}
+
+static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+
+ blkBits[chunk/8] |= (1<<(chunk & 7));
+}
+
+static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev,int blk,int chunk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+ return (blkBits[chunk/8] & (1<<(chunk & 7))) ? 1 :0;
+}
+
+static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+ int i;
+ for(i = 0; i < dev->chunkBitmapStride; i++)
+ {
+ if(*blkBits) return 1;
+ blkBits++;
+ }
+ return 0;
+}
+
+
+static Y_INLINE int yaffs_HashFunction(int n)
+{
+ return (n % YAFFS_NOBJECT_BUCKETS);
+}
+
+
+yaffs_Object *yaffs_Root(yaffs_Device *dev)
+{
+ return dev->rootDir;
+}
+
+yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
+{
+ return dev->lostNFoundDir;
+}
+
+
+
+
+int yaffs_CheckFF(__u8 *buffer,int nBytes)
+{
+ //Horrible, slow implementation
+ while(nBytes--)
+ {
+ if(*buffer != 0xFF) return 0;
+ buffer++;
+ }
+ return 1;
+}
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
+{
+
+ int retval = YAFFS_OK;
+ __u8 *data = yaffs_GetTempBuffer(dev,__LINE__);
+ yaffs_ExtendedTags tags;
+
+// NCB dev->readChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
+
+ if(!yaffs_CheckFF(data,dev->nBytesPerChunk) || tags.chunkUsed)
+ {
+ T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not erased" TENDSTR),chunkInNAND));
+ retval = YAFFS_FAIL;
+ }
+
+ yaffs_ReleaseTempBuffer(dev,data,__LINE__);
+
+ return retval;
+
+}
+
+
+
+#if 1
+static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_ExtendedTags *tags,int useReserve)
+{
+ int chunk;
+
+ int writeOk = 1;
+ int attempts = 0;
+
+
+
+ do{
+ chunk = yaffs_AllocateChunk(dev,useReserve);
+
+ if(chunk >= 0)
+ {
+
+ // First check this chunk is erased...
+#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
+ writeOk = yaffs_CheckChunkErased(dev,chunk);
+#endif
+ if(!writeOk)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
+ }
+ else
+ {
+ writeOk = yaffs_WriteChunkWithTagsToNAND(dev,chunk,data,tags);
+ }
+ attempts++;
+
+ if(writeOk)
+ {
+ // Copy the data into the robustification buffer.
+ // NB We do this at the end to prevent duplicates in the case of a write error.
+ //Todo
+ yaffs_HandleWriteChunkOk(dev,chunk,data,tags);
+ }
+ else
+ {
+ yaffs_HandleWriteChunkError(dev,chunk);
+ }
+ }
+
+ } while(chunk >= 0 && ! writeOk);
+
+ if(attempts > 1)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
+ dev->nRetriedWrites+= (attempts - 1);
+ }
+
+
+
+ return chunk;
+}
+#endif
+
+
+///
+// Functions for robustisizing
+//
+//
+
+static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
+{
+
+ yaffs_MarkBlockBad(dev,blockInNAND);
+
+ yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
+
+ dev->nRetiredBlocks++;
+}
+
+
+#if 0
+static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
+{
+ dev->doingBufferedBlockRewrite = 1;
+ //
+ // Remove erased chunks
+ // Rewrite existing chunks to a new block
+ // Set current write block to the new block
+
+ dev->doingBufferedBlockRewrite = 0;
+
+ return 1;
+}
+
+
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
+
+
+ //TODO
+ // Just do a garbage collection on the affected block then retire the block
+ // NB recursion
+}
+
+
+static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
+{
+}
+
+#endif
+
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
+{
+}
+
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_ExtendedTags *tags)
+{
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ // Delete the chunk
+ yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
+}
+
+
+
+#if 0
+static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize)
+{
+
+
+ if( memcmp(d0,d1,dataSize) != 0 ||
+ s0->tagByte0 != s1->tagByte0 ||
+ s0->tagByte1 != s1->tagByte1 ||
+ s0->tagByte2 != s1->tagByte2 ||
+ s0->tagByte3 != s1->tagByte3 ||
+ s0->tagByte4 != s1->tagByte4 ||
+ s0->tagByte5 != s1->tagByte5 ||
+ s0->tagByte6 != s1->tagByte6 ||
+ s0->tagByte7 != s1->tagByte7 ||
+ s0->ecc1[0] != s1->ecc1[0] ||
+ s0->ecc1[1] != s1->ecc1[1] ||
+ s0->ecc1[2] != s1->ecc1[2] ||
+ s0->ecc2[0] != s1->ecc2[0] ||
+ s0->ecc2[1] != s1->ecc2[1] ||
+ s0->ecc2[2] != s1->ecc2[2] )
+ {
+ return 0;
+ }
+
+ return 1;
+}
+#endif
+
+
+///////////////////////// Object management //////////////////
+// List of spare objects
+// The list is hooked together using the first pointer
+// in the object
+
+// static yaffs_Object *yaffs_freeObjects = NULL;
+
+// static int yaffs_nFreeObjects;
+
+// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
+
+// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
+
+
+static __u16 yaffs_CalcNameSum(const YCHAR *name)
+{
+ __u16 sum = 0;
+ __u16 i = 1;
+
+ YUCHAR *bname = (YUCHAR *)name;
+ if(bname)
+ {
+ while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
+ {
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ sum += yaffs_toupper(*bname) * i;
+#else
+ sum += (*bname) * i;
+#endif
+ i++;
+ bname++;
+ }
+ }
+ return sum;
+}
+
+static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
+{
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+ if(name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
+ {
+ yaffs_strcpy(obj->shortName,name);
+ }
+ else
+ {
+ obj->shortName[0]=_Y('\0');
+ }
+#endif
+ obj->sum = yaffs_CalcNameSum(name);
+}
+
+#if 0
+void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
+{
+ yaffs_ECCCalculate(data , spare->ecc1);
+ yaffs_ECCCalculate(&data[256] , spare->ecc2);
+}
+#endif
+
+
+///////////////////////// TNODES ///////////////////////
+
+// List of spare tnodes
+// The list is hooked together using the first pointer
+// in the tnode.
+
+//static yaffs_Tnode *yaffs_freeTnodes = NULL;
+
+// static int yaffs_nFreeTnodes;
+
+//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
+
+
+
+// yaffs_CreateTnodes creates a bunch more tnodes and
+// adds them to the tnode free list.
+// Don't use this function directly
+
+static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)
+{
+ int i;
+ yaffs_Tnode *newTnodes;
+ yaffs_TnodeList *tnl;
+
+ if(nTnodes < 1) return YAFFS_OK;
+
+ // make these things
+
+ newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
+
+ if (!newTnodes)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Hook them into the free list
+ for(i = 0; i < nTnodes - 1; i++)
+ {
+ newTnodes[i].internal[0] = &newTnodes[i+1];
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+ newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+ }
+
+ newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+ newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+ dev->freeTnodes = newTnodes;
+ dev->nFreeTnodes+= nTnodes;
+ dev->nTnodesCreated += nTnodes;
+
+ // Now add this bunch of tnodes to a list for freeing up.
+ // NB If we can't add this to the management list it isn't fatal
+ // but it just means we can't free this bunch of tnodes later.
+ tnl = YMALLOC(sizeof(yaffs_TnodeList));
+ if(!tnl)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));
+
+ }
+ else
+ {
+ tnl->tnodes = newTnodes;
+ tnl->next = dev->allocatedTnodeList;
+ dev->allocatedTnodeList = tnl;
+ }
+
+
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
+
+
+ return YAFFS_OK;
+}
+
+
+// GetTnode gets us a clean tnode. Tries to make allocate more if we run out
+static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
+{
+ yaffs_Tnode *tn = NULL;
+
+ // If there are none left make more
+ if(!dev->freeTnodes)
+ {
+ yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES);
+ }
+
+ if(dev->freeTnodes)
+ {
+ tn = dev->freeTnodes;
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+ if(tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1)
+ {
+ // Hoosterman, this thing looks like it isn't in the list
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 1" TENDSTR)));
+ }
+#endif
+ dev->freeTnodes = dev->freeTnodes->internal[0];
+ dev->nFreeTnodes--;
+ // zero out
+ memset(tn,0,sizeof(yaffs_Tnode));
+ }
+
+
+ return tn;
+}
+
+
+// FreeTnode frees up a tnode and puts it back on the free list
+static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)
+{
+ if(tn)
+ {
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+ if(tn->internal[YAFFS_NTNODES_INTERNAL] != 0)
+ {
+ // Hoosterman, this thing looks like it is already in the list
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 2" TENDSTR)));
+ }
+ tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+ tn->internal[0] = dev->freeTnodes;
+ dev->freeTnodes = tn;
+ dev->nFreeTnodes++;
+ }
+}
+
+
+static void yaffs_DeinitialiseTnodes(yaffs_Device*dev)
+{
+ // Free the list of allocated tnodes
+ yaffs_TnodeList *tmp;
+
+ while(dev->allocatedTnodeList)
+ {
+ tmp = dev->allocatedTnodeList->next;
+
+ YFREE(dev->allocatedTnodeList->tnodes);
+ YFREE(dev->allocatedTnodeList);
+ dev->allocatedTnodeList = tmp;
+
+ }
+
+ dev->freeTnodes = NULL;
+ dev->nFreeTnodes = 0;
+}
+
+static void yaffs_InitialiseTnodes(yaffs_Device*dev)
+{
+ dev->allocatedTnodeList = NULL;
+ dev->freeTnodes = NULL;
+ dev->nFreeTnodes = 0;
+ dev->nTnodesCreated = 0;
+
+}
+
+#if 0
+void yaffs_TnodeTest(yaffs_Device *dev)
+{
+
+ int i;
+ int j;
+ yaffs_Tnode *tn[1000];
+
+ YINFO("Testing TNodes");
+
+ for(j = 0; j < 50; j++)
+ {
+ for(i = 0; i < 1000; i++)
+ {
+ tn[i] = yaffs_GetTnode(dev);
+ if(!tn[i])
+ {
+ YALERT("Getting tnode failed");
+ }
+ }
+ for(i = 0; i < 1000; i+=3)
+ {
+ yaffs_FreeTnode(dev,tn[i]);
+ tn[i] = NULL;
+ }
+
+ }
+}
+#endif
+
+
+////////////////// END OF TNODE MANIPULATION ///////////////////////////
+
+/////////////// Functions to manipulate the look-up tree (made up of tnodes)
+// The look up tree is represented by the top tnode and the number of topLevel
+// in the tree. 0 means only the level 0 tnode is in the tree.
+
+
+// FindLevel0Tnode finds the level 0 tnode, if one exists.
+// Used when reading.....
+static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)
+{
+
+ yaffs_Tnode *tn = fStruct->top;
+ __u32 i;
+ int requiredTallness;
+ int level = fStruct->topLevel;
+
+ // Check sane level and chunk Id
+ if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+ {
+// char str[50];
+// sprintf(str,"Bad level %d",level);
+// YALERT(str);
+ return NULL;
+ }
+
+ if(chunkId > YAFFS_MAX_CHUNK_ID)
+ {
+// char str[50];
+// sprintf(str,"Bad chunkId %d",chunkId);
+// YALERT(str);
+ return NULL;
+ }
+
+ // First check we're tall enough (ie enough topLevel)
+
+ i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
+ requiredTallness = 0;
+ while(i)
+ {
+ i >>= YAFFS_TNODES_INTERNAL_BITS;
+ requiredTallness++;
+ }
+
+
+ if(requiredTallness > fStruct->topLevel)
+ {
+ // Not tall enough, so we can't find it, return NULL.
+ return NULL;
+ }
+
+
+ // Traverse down to level 0
+ while (level > 0 && tn)
+ {
+ tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
+ YAFFS_TNODES_INTERNAL_MASK];
+ level--;
+
+ }
+
+ return tn;
+}
+
+// AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+// This happens in two steps:
+// 1. If the tree isn't tall enough, then make it taller.
+// 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+//
+// Used when modifying the tree.
+//
+static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
+{
+
+ yaffs_Tnode *tn;
+
+ int requiredTallness;
+ int i;
+ int l;
+
+ __u32 x;
+
+
+ //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
+
+ // Check sane level and page Id
+ if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
+ {
+// char str[50];
+// sprintf(str,"Bad level %d",fStruct->topLevel);
+// YALERT(str);
+ return NULL;
+ }
+
+ if(chunkId > YAFFS_MAX_CHUNK_ID)
+ {
+// char str[50];
+// sprintf(str,"Bad chunkId %d",chunkId);
+// YALERT(str);
+ return NULL;
+ }
+
+ // First check we're tall enough (ie enough topLevel)
+
+ x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
+ requiredTallness = 0;
+ while(x)
+ {
+ x >>= YAFFS_TNODES_INTERNAL_BITS;
+ requiredTallness++;
+ }
+
+ //T((TSTR(" required=%d"),requiredTallness));
+
+
+ if(requiredTallness > fStruct->topLevel)
+ {
+ // Not tall enough,gotta make the tree taller
+ for(i = fStruct->topLevel; i < requiredTallness; i++)
+ {
+ //T((TSTR(" add new top")));
+
+ tn = yaffs_GetTnode(dev);
+
+ if(tn)
+ {
+ tn->internal[0] = fStruct->top;
+ fStruct->top = tn;
+ }
+ else
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
+ }
+ }
+
+ fStruct->topLevel = requiredTallness;
+ }
+
+
+ // Traverse down to level 0, adding anything we need
+
+ l = fStruct->topLevel;
+ tn = fStruct->top;
+ while (l > 0 && tn)
+ {
+ x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
+ YAFFS_TNODES_INTERNAL_MASK;
+
+ //T((TSTR(" [%d:%d]"),l,i));
+
+ if(!tn->internal[x])
+ {
+ //T((TSTR(" added")));
+
+ tn->internal[x] = yaffs_GetTnode(dev);
+ }
+
+ tn = tn->internal[x];
+ l--;
+
+ }
+
+ //TSTR(TENDSTR)));
+
+ return tn;
+}
+
+
+static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk, yaffs_ExtendedTags *tags, int objectId, int chunkInInode)
+{
+ int j;
+
+
+ for(j = 0; theChunk && j < dev->chunkGroupSize; j++)
+ {
+ if(yaffs_CheckChunkBit(dev,theChunk / dev->nChunksPerBlock,theChunk % dev->nChunksPerBlock))
+ {
+ yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL,tags);
+ if(yaffs_TagsMatch(tags,objectId,chunkInInode))
+ {
+ // found it;
+ return theChunk;
+
+ }
+ }
+ theChunk++;
+ }
+ return -1;
+}
+
+// DeleteWorker scans backwards through the tnode tree and deletes all the
+// chunks and tnodes in the file
+// Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
+
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)
+{
+ int i;
+ int chunkInInode;
+ int theChunk;
+ yaffs_ExtendedTags tags;
+ int foundChunk;
+ yaffs_Device *dev = in->myDev;
+
+ int allDone = 1;
+
+
+ if(tn)
+ {
+ if(level > 0)
+ {
+
+ for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
+ {
+ if(tn->internal[i])
+ {
+ if(limit && (*limit) < 0)
+ {
+ allDone = 0;
+ }
+ else
+ {
+ allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,
+ (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);
+ }
+ if(allDone)
+ {
+ yaffs_FreeTnode(dev,tn->internal[i]);
+ tn->internal[i] = NULL;
+ }
+ }
+
+ }
+ return (allDone) ? 1 : 0;
+ }
+ else if(level == 0)
+ {
+ int hitLimit = 0;
+
+ for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--)
+ {
+ if(tn->level0[i])
+ {
+
+ chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
+
+ theChunk = tn->level0[i] << dev->chunkGroupBits;
+
+ foundChunk = yaffs_FindChunkInGroup(dev,theChunk,&tags,in->objectId,chunkInInode);
+
+ if(foundChunk > 0)
+ {
+ yaffs_DeleteChunk(dev,foundChunk,1,__LINE__);
+ in->nDataChunks--;
+ if(limit)
+ {
+ *limit = *limit-1;
+ if(*limit <= 0)
+ {
+ hitLimit = 1;
+ }
+ }
+
+ }
+
+ tn->level0[i] = 0;
+ }
+
+ }
+ return (i < 0) ? 1 : 0;
+
+
+ }
+
+ }
+
+ return 1;
+
+}
+
+
+static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
+{
+
+ yaffs_BlockInfo *theBlock;
+
+ T(YAFFS_TRACE_DELETION,(TSTR("soft delete chunk %d" TENDSTR),chunk));
+
+ theBlock = yaffs_GetBlockInfo(dev, chunk/dev->nChunksPerBlock);
+ if(theBlock)
+ {
+ theBlock->softDeletions++;
+ dev->nFreeChunks++;
+ }
+}
+
+// SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+// All soft deleting does is increment the block's softdelete count and pulls the chunk out
+// of the tnode.
+// THus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+//
+static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset)
+{
+ int i;
+ int theChunk;
+ int allDone = 1;
+ yaffs_Device *dev = in->myDev;
+
+
+ if(tn)
+ {
+ if(level > 0)
+ {
+
+ for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
+ {
+ if(tn->internal[i])
+ {
+ allDone = yaffs_SoftDeleteWorker(in,tn->internal[i],level - 1,
+ (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i);
+ if(allDone)
+ {
+ yaffs_FreeTnode(dev,tn->internal[i]);
+ tn->internal[i] = NULL;
+ }
+ else
+ {
+ //Hoosterman... how could this happen.
+ }
+ }
+ }
+ return (allDone) ? 1 : 0;
+ }
+ else if(level == 0)
+ {
+
+ for(i = YAFFS_NTNODES_LEVEL0 -1; i >=0; i--)
+ {
+ if(tn->level0[i])
+ {
+ // Note this does not find the real chunk, only the chunk group.
+ // We make an assumption that a chunk group is niot larger than a block.
+ theChunk = (tn->level0[i] << dev->chunkGroupBits);
+
+ yaffs_SoftDeleteChunk(dev,theChunk);
+ tn->level0[i] = 0;
+ }
+
+ }
+ return 1;
+
+ }
+
+ }
+
+ return 1;
+
+}
+
+
+
+static void yaffs_SoftDeleteFile(yaffs_Object *obj)
+{
+ if(obj->deleted &&
+ obj->variantType == YAFFS_OBJECT_TYPE_FILE &&
+ !obj->softDeleted)
+ {
+ if(obj->nDataChunks <= 0)
+ {
+ // Empty file with no duplicate object headers, just delete it immediately
+ yaffs_FreeTnode(obj->myDev,obj->variant.fileVariant.top);
+ obj->variant.fileVariant.top = NULL;
+ T(YAFFS_TRACE_TRACING,(TSTR("yaffs: Deleting empty file %d" TENDSTR),obj->objectId));
+ yaffs_DoGenericObjectDeletion(obj);
+ }
+ else
+ {
+ yaffs_SoftDeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0);
+ obj->softDeleted = 1;
+ }
+ }
+}
+
+
+
+
+
+// Pruning removes any part of the file structure tree that is beyond the
+// bounds of the file (ie that does not point to chunks).
+//
+// A file should only get pruned when its size is reduced.
+//
+// Before pruning, the chunks must be pulled from the tree and the
+// level 0 tnode entries must be zeroed out.
+// Could also use this for file deletion, but that's probably better handled
+// by a special case.
+
+// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
+{
+ int i;
+ int hasData;
+
+ if(tn)
+ {
+ hasData = 0;
+
+ for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
+ {
+ if(tn->internal[i] && level > 0)
+ {
+ tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
+ }
+
+ if(tn->internal[i])
+ {
+ hasData++;
+ }
+ }
+
+ if(hasData == 0 && del0)
+ {
+ // Free and return NULL
+
+ yaffs_FreeTnode(dev,tn);
+ tn = NULL;
+ }
+
+ }
+
+ return tn;
+
+}
+
+static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
+{
+ int i;
+ int hasData;
+ int done = 0;
+ yaffs_Tnode *tn;
+
+ if(fStruct->topLevel > 0)
+ {
+ fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
+
+ // Now we have a tree with all the non-zero branches NULL but the height
+ // is the same as it was.
+ // Let's see if we can trim internal tnodes to shorten the tree.
+ // We can do this if only the 0th element in the tnode is in use
+ // (ie all the non-zero are NULL)
+
+ while(fStruct->topLevel && !done)
+ {
+ tn = fStruct->top;
+
+ hasData = 0;
+ for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
+ {
+ if(tn->internal[i])
+ {
+ hasData++;
+ }
+ }
+
+ if(!hasData)
+ {
+ fStruct->top = tn->internal[0];
+ fStruct->topLevel--;
+ yaffs_FreeTnode(dev,tn);
+ }
+ else
+ {
+ done = 1;
+ }
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+
+
+
+
+/////////////////////// End of File Structure functions. /////////////////
+
+// yaffs_CreateFreeObjects creates a bunch more objects and
+// adds them to the object free list.
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+ int i;
+ yaffs_Object *newObjects;
+ yaffs_ObjectList *list;
+
+ if(nObjects < 1) return YAFFS_OK;
+
+ // make these things
+
+ newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+
+ if (!newObjects)
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Hook them into the free list
+ for(i = 0; i < nObjects - 1; i++)
+ {
+ newObjects[i].siblings.next = (struct list_head *)(&newObjects[i+1]);
+ }
+
+ newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
+ dev->freeObjects = newObjects;
+ dev->nFreeObjects+= nObjects;
+ dev->nObjectsCreated+= nObjects;
+
+ // Now add this bunch of Objects to a list for freeing up.
+
+ list = YMALLOC(sizeof(yaffs_ObjectList));
+ if(!list)
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
+ }
+ else
+ {
+ list->objects = newObjects;
+ list->next = dev->allocatedObjectList;
+ dev->allocatedObjectList = list;
+ }
+
+
+
+ return YAFFS_OK;
+}
+
+
+// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
+{
+ yaffs_Object *tn = NULL;
+
+ // If there are none left make more
+ if(!dev->freeObjects)
+ {
+ yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
+ }
+
+ if(dev->freeObjects)
+ {
+ tn = dev->freeObjects;
+ dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
+ dev->nFreeObjects--;
+
+ // Now sweeten it up...
+
+ memset(tn,0,sizeof(yaffs_Object));
+ tn->myDev = dev;
+ tn->chunkId = -1;
+ tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+ INIT_LIST_HEAD(&(tn->hardLinks));
+ INIT_LIST_HEAD(&(tn->hashLink));
+ INIT_LIST_HEAD(&tn->siblings);
+
+ // Add it to the lost and found directory.
+ // NB Can't put root or lostNFound in lostNFound so
+ // check if lostNFound exists first
+ if(dev->lostNFoundDir)
+ {
+ yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
+ }
+ }
+
+
+ return tn;
+}
+
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
+{
+
+ yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
+ if(obj)
+ {
+ obj->fake = 1; // it is fake so it has no NAND presence...
+ obj->renameAllowed= 0; // ... and we're not allowed to rename it...
+ obj->unlinkAllowed= 0; // ... or unlink it
+ obj->deleted = 0;
+ obj->unlinked = 0;
+ obj->yst_mode = mode;
+ obj->myDev = dev;
+ obj->chunkId = 0; // Not a valid chunk.
+ }
+
+ return obj;
+
+}
+
+
+static void yaffs_UnhashObject(yaffs_Object *tn)
+{
+ int bucket;
+ yaffs_Device *dev = tn->myDev;
+
+
+ // If it is still linked into the bucket list, free from the list
+ if(!list_empty(&tn->hashLink))
+ {
+ list_del_init(&tn->hashLink);
+ bucket = yaffs_HashFunction(tn->objectId);
+ dev->objectBucket[bucket].count--;
+ }
+
+}
+
+
+// FreeObject frees up a Object and puts it back on the free list
+static void yaffs_FreeObject(yaffs_Object *tn)
+{
+
+ yaffs_Device *dev = tn->myDev;
+
+#ifdef __KERNEL__
+ if(tn->myInode)
+ {
+ // We're still hooked up to a cached inode.
+ // Don't delete now, but mark for later deletion
+ tn->deferedFree = 1;
+ return;
+ }
+#endif
+
+ yaffs_UnhashObject(tn);
+
+ // Link into the free list.
+ tn->siblings.next = (struct list_head *)(dev->freeObjects);
+ dev->freeObjects = tn;
+ dev->nFreeObjects++;
+}
+
+
+
+#ifdef __KERNEL__
+
+void yaffs_HandleDeferedFree(yaffs_Object *obj)
+{
+ if(obj->deferedFree)
+ {
+ yaffs_FreeObject(obj);
+ }
+}
+
+#endif
+
+
+
+static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
+{
+ // Free the list of allocated Objects
+
+ yaffs_ObjectList *tmp;
+
+ while( dev->allocatedObjectList)
+ {
+ tmp = dev->allocatedObjectList->next;
+ YFREE(dev->allocatedObjectList->objects);
+ YFREE(dev->allocatedObjectList);
+
+ dev->allocatedObjectList = tmp;
+ }
+
+ dev->freeObjects = NULL;
+ dev->nFreeObjects = 0;
+}
+
+static void yaffs_InitialiseObjects(yaffs_Device *dev)
+{
+ int i;
+
+ dev->allocatedObjectList = NULL;
+ dev->freeObjects = NULL;
+ dev->nFreeObjects = 0;
+
+ for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
+ {
+ INIT_LIST_HEAD(&dev->objectBucket[i].list);
+ dev->objectBucket[i].count = 0;
+ }
+
+}
+
+
+
+
+
+
+static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
+{
+ static int x = 0;
+ int i;
+ int l = 999;
+ int lowest = 999999;
+
+
+ // First let's see if we can find one that's empty.
+
+ for(i = 0; i < 10 && lowest > 0; i++)
+ {
+ x++;
+ x %= YAFFS_NOBJECT_BUCKETS;
+ if(dev->objectBucket[x].count < lowest)
+ {
+ lowest = dev->objectBucket[x].count;
+ l = x;
+ }
+
+ }
+
+ // If we didn't find an empty list, then try
+ // looking a bit further for a short one
+
+ for(i = 0; i < 10 && lowest > 3; i++)
+ {
+ x++;
+ x %= YAFFS_NOBJECT_BUCKETS;
+ if(dev->objectBucket[x].count < lowest)
+ {
+ lowest = dev->objectBucket[x].count;
+ l = x;
+ }
+
+ }
+
+ return l;
+}
+
+static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
+{
+ int bucket = yaffs_FindNiceObjectBucket(dev);
+
+ // Now find an object value that has not already been taken
+ // by scanning the list.
+
+ int found = 0;
+ struct list_head *i;
+
+ __u32 n = (__u32)bucket;
+
+ //yaffs_CheckObjectHashSanity();
+
+ while(!found)
+ {
+ found = 1;
+ n += YAFFS_NOBJECT_BUCKETS;
+ if(1 ||dev->objectBucket[bucket].count > 0)
+ {
+ list_for_each(i,&dev->objectBucket[bucket].list)
+ {
+ // If there is already one in the list
+ if(i && list_entry(i, yaffs_Object,hashLink)->objectId == n)
+ {
+ found = 0;
+ }
+ }
+ }
+ }
+
+ //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
+
+ return n;
+}
+
+static void yaffs_HashObject(yaffs_Object *in)
+{
+ int bucket = yaffs_HashFunction(in->objectId);
+ yaffs_Device *dev = in->myDev;
+
+ if(!list_empty(&in->hashLink))
+ {
+ //YINFO("!!!");
+ }
+
+
+ list_add(&in->hashLink,&dev->objectBucket[bucket].list);
+ dev->objectBucket[bucket].count++;
+
+}
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
+{
+ int bucket = yaffs_HashFunction(number);
+ struct list_head *i;
+ yaffs_Object *in;
+
+ list_for_each(i,&dev->objectBucket[bucket].list)
+ {
+ // Look if it is in the list
+ if(i)
+ {
+ in = list_entry(i, yaffs_Object,hashLink);
+ if(in->objectId == number)
+ {
+#ifdef __KERNEL__
+ // Don't tell the VFS about this one if it is defered free
+ if(in->deferedFree)
+ return NULL;
+#endif
+
+ return in;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+
+
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
+{
+
+ yaffs_Object *theObject;
+
+ if(number < 0)
+ {
+ number = yaffs_CreateNewObjectNumber(dev);
+ }
+
+ theObject = yaffs_AllocateEmptyObject(dev);
+
+ if(theObject)
+ {
+ theObject->fake = 0;
+ theObject->renameAllowed = 1;
+ theObject->unlinkAllowed = 1;
+ theObject->objectId = number;
+ yaffs_HashObject(theObject);
+ theObject->variantType = type;
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(theObject->win_atime);
+ theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
+ theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
+
+#else
+
+ theObject->yst_atime = theObject->yst_mtime = theObject->yst_ctime = Y_CURRENT_TIME;
+#endif
+ switch(type)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ theObject->variant.fileVariant.fileSize = 0;
+ theObject->variant.fileVariant.scannedFileSize = 0;
+ theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; // max __u32
+ theObject->variant.fileVariant.topLevel = 0;
+ theObject->variant.fileVariant.top = yaffs_GetTnode(dev);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ // todo this should not happen
+ break;
+ }
+ }
+
+ return theObject;
+}
+
+static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
+{
+ yaffs_Object *theObject = NULL;
+
+ if(number > 0)
+ {
+ theObject = yaffs_FindObjectByNumber(dev,number);
+ }
+
+ if(!theObject)
+ {
+ theObject = yaffs_CreateNewObject(dev,number,type);
+ }
+
+ return theObject;
+
+}
+
+static YCHAR *yaffs_CloneString(const YCHAR *str)
+{
+ YCHAR *newStr = NULL;
+
+ if(str && *str)
+ {
+ newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
+ yaffs_strcpy(newStr,str);
+ }
+
+ return newStr;
+
+}
+
+//
+// Mknod (create) a new object.
+// equivalentObject only has meaning for a hard link;
+// aliasString only has meaning for a sumlink.
+// rdev only has meaning for devices (a subset of special objects)
+static yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
+ yaffs_Object *parent,
+ const YCHAR *name,
+ __u32 mode,
+ __u32 uid,
+ __u32 gid,
+ yaffs_Object *equivalentObject,
+ const YCHAR *aliasString,
+ __u32 rdev)
+{
+ yaffs_Object *in;
+
+ yaffs_Device *dev = parent->myDev;
+
+ // Check if the entry exists. If it does then fail the call since we don't want a dup.
+ if(yaffs_FindObjectByName(parent,name))
+ {
+ return NULL;
+ }
+
+ in = yaffs_CreateNewObject(dev,-1,type);
+
+ if(in)
+ {
+ in->chunkId = -1;
+ in->valid = 1;
+ in->variantType = type;
+
+ in->yst_mode = mode;
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(in->win_atime);
+ in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+ in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
+
+#else
+ in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
+
+ in->yst_rdev = rdev;
+ in->yst_uid = uid;
+ in->yst_gid = gid;
+#endif
+ in->nDataChunks = 0;
+
+ yaffs_SetObjectName(in,name);
+ in->dirty = 1;
+
+ yaffs_AddObjectToDirectory(parent,in);
+
+ in->myDev = parent->myDev;
+
+
+ switch(type)
+ {
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardLinkVariant.equivalentObject = equivalentObject;
+ in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
+ list_add(&in->hardLinks,&equivalentObject->hardLinks);
+ break;
+ case YAFFS_OBJECT_TYPE_FILE: // do nothing
+ case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
+ case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ break;
+ }
+
+ if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
+ yaffs_UpdateObjectHeader(in,name,0,0,0) < 0)
+ {
+ // Could not create the object header, fail the creation
+ yaffs_DestroyObject(in);
+ in = NULL;
+ }
+
+ }
+
+ return in;
+}
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);
+}
+
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
+}
+
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL,parent,name,mode,uid,gid,NULL,NULL,rdev);
+}
+
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid,const YCHAR *alias)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);
+}
+
+// NB yaffs_Link returns the object id of the equivalent object.
+yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, yaffs_Object *equivalentObject)
+{
+ // Get the real object in case we were fed a hard link as an equivalent object
+ equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
+
+ if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))
+ {
+ return equivalentObject;
+ }
+ else
+ {
+ return NULL;
+ }
+
+}
+
+
+static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const YCHAR *newName,int force,int shadows)
+{
+ int unlinkOp;
+ int deleteOp;
+
+ yaffs_Object * existingTarget;
+
+ if(newDir == NULL)
+ {
+ newDir = obj->parent; // use the old directory
+ }
+
+ if(newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("tragendy: yaffs_ChangeObjectName: newDir is not a directory"TENDSTR)));
+ YBUG();
+ }
+
+ // TODO: Do we need this different handling for YAFFS2 and YAFFS1??
+ if(obj->myDev->isYaffs2)
+ {
+ unlinkOp = (newDir == obj->myDev->unlinkedDir);
+ }
+ else
+ {
+ unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
+ }
+
+ deleteOp = (newDir == obj->myDev->deletedDir);
+
+ existingTarget = yaffs_FindObjectByName(newDir,newName);
+
+ // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since
+ // duplicate names are allowed.
+ // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
+ if( (unlinkOp||
+ deleteOp ||
+ force ||
+ (shadows > 0) ||
+ !existingTarget) &&
+ newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ yaffs_SetObjectName(obj,newName);
+ obj->dirty = 1;
+
+ yaffs_AddObjectToDirectory(newDir,obj);
+
+ if(unlinkOp) obj->unlinked = 1;
+
+ // If it is a deletion then we mark it as a shrink for gc purposes.
+ if(yaffs_UpdateObjectHeader(obj,newName,0,deleteOp,shadows) >= 0)
+ {
+ return YAFFS_OK;
+ }
+ }
+
+ return YAFFS_FAIL;
+}
+
+
+
+int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, yaffs_Object *newDir, const YCHAR *newName)
+{
+ yaffs_Object *obj;
+ yaffs_Object *existingTarget;
+ int force = 0;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ // Special case for case insemsitive systems (eg. WinCE).
+ // While look-up is case insensitive, the name isn't.
+ // THerefore we might want to change x.txt to X.txt
+ if(oldDir == newDir && yaffs_strcmp(oldName,newName) == 0)
+ {
+ force = 1;
+ }
+#endif
+
+ obj = yaffs_FindObjectByName(oldDir,oldName);
+
+ if(obj && obj->renameAllowed)
+ {
+
+ // Now do the handling for an existing target, if there is one
+
+ existingTarget = yaffs_FindObjectByName(newDir,newName);
+ if(existingTarget &&
+ existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+ !list_empty(&existingTarget->variant.directoryVariant.children))
+ {
+ // There is a target that is a non-empty directory, so we have to fail
+ return YAFFS_FAIL; // EEXIST or ENOTEMPTY
+ }
+ else if(existingTarget)
+ {
+ // Nuke the target first, using shadowing
+ yaffs_ChangeObjectName(obj,newDir,newName,force,existingTarget->objectId);
+ yaffs_Unlink(newDir,newName);
+ }
+
+
+ return yaffs_ChangeObjectName(obj,newDir,newName,force,0);
+ }
+ return YAFFS_FAIL;
+}
+
+
+#if 0
+
+static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
+{
+ // Scan the buckets and check that the lists
+ // have as many members as the count says there are
+ int bucket;
+ int countEm;
+ struct list_head *j;
+ int ok = YAFFS_OK;
+
+ for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
+ {
+ countEm = 0;
+
+ list_for_each(j,&dev->objectBucket[bucket].list)
+ {
+ countEm++;
+ }
+
+ if(countEm != dev->objectBucket[bucket].count)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
+ ok = YAFFS_FAIL;
+ }
+ }
+
+ return ok;
+}
+
+
+void yaffs_ObjectTest(yaffs_Device *dev)
+{
+ yaffs_Object *in[1000];
+ int inNo[1000];
+ yaffs_Object *inold[1000];
+ int i;
+ int j;
+
+ memset(in,0,1000*sizeof(yaffs_Object *));
+ memset(inold,0,1000*sizeof(yaffs_Object *));
+
+ yaffs_CheckObjectHashSanity(dev);
+
+ for(j = 0; j < 10; j++)
+ {
+ //T(("%d\n",j));
+
+ for(i = 0; i < 1000; i++)
+ {
+ in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
+ if(!in[i])
+ {
+ YINFO("No more inodes");
+ }
+ else
+ {
+ inNo[i] = in[i]->objectId;
+ }
+ }
+
+ for(i = 0; i < 1000; i++)
+ {
+ if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
+ {
+ //T(("Differnce in look up test\n"));
+ }
+ else
+ {
+ // T(("Look up ok\n"));
+ }
+ }
+
+ yaffs_CheckObjectHashSanity(dev);
+
+ for(i = 0; i < 1000; i+=3)
+ {
+ yaffs_FreeObject(in[i]);
+ in[i] = NULL;
+ }
+
+
+ yaffs_CheckObjectHashSanity(dev);
+ }
+
+}
+
+#endif
+
+/////////////////////////// Block Management and Page Allocation ///////////////////
+
+
+static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
+{
+ dev->allocationBlock = -1; // force it to get a new one
+ //Todo we're assuming the malloc will pass.
+ dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+ // Set up dynamic blockinfo stuff.
+ dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
+ dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+ if(dev->blockInfo && dev->chunkBits)
+ {
+ memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
+ memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks);
+ return YAFFS_OK;
+ }
+
+ return YAFFS_FAIL;
+
+}
+
+static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
+{
+ YFREE(dev->blockInfo);
+ dev->blockInfo = NULL;
+ YFREE(dev->chunkBits);
+ dev->chunkBits = NULL;
+}
+
+
+static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+ int i;
+ __u32 seq;
+ yaffs_BlockInfo *b;
+
+ if(!dev->isYaffs2) return 1; // disqualification only applies to yaffs2.
+
+ if(!bi->hasShrinkHeader) return 1; // can gc
+
+
+ // Find the oldest dirty sequence number if we don't know it and save it
+ // so we don't have to keep recomputing it.
+ if(!dev->oldestDirtySequence)
+ {
+ seq = dev->sequenceNumber;
+
+ for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++)
+ {
+ b = yaffs_GetBlockInfo(dev,i);
+ if(b->blockState == YAFFS_BLOCK_STATE_FULL &&
+ (b->pagesInUse - b->softDeletions )< dev->nChunksPerBlock &&
+ b->sequenceNumber < seq)
+ {
+ seq = b->sequenceNumber;
+ }
+ }
+ dev->oldestDirtySequence = seq;
+ }
+
+
+ // Can't do gc of this block if there are any blocks older than this one that have
+ // discarded pages.
+ return (bi->sequenceNumber <= dev->oldestDirtySequence);
+
+
+ return 1;
+
+}
+
+// FindDiretiestBlock is used to select the dirtiest block (or close enough)
+// for garbage collection.
+//
+
+
+
+static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,int aggressive)
+{
+
+ int b = dev->currentDirtyChecker;
+
+ int i;
+ int iterations;
+ int dirtiest = -1;
+ int pagesInUse;
+ yaffs_BlockInfo *bi;
+ static int nonAggressiveSkip = 0;
+
+ // If we're doing aggressive GC then we are happy to take a less-dirty block, and
+ // search harder.
+ // else (we're doing a leasurely gc), then we only bother to do this if the
+ // block has only a few pages in use.
+
+
+ nonAggressiveSkip--;
+
+ if(!aggressive &&(nonAggressiveSkip > 0))
+ {
+ return -1;
+ }
+
+ pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
+
+ if(aggressive)
+ {
+ iterations = dev->internalEndBlock - dev->internalStartBlock + 1;
+ }
+ else
+ {
+ iterations = dev->internalEndBlock - dev->internalStartBlock + 1;
+ iterations = iterations / 16;
+ if(iterations > 200)
+ {
+ iterations = 200;
+ }
+ }
+
+ for(i = 0; i <= iterations && pagesInUse > 0 ; i++)
+ {
+ b++;
+ if ( b < dev->internalStartBlock || b > dev->internalEndBlock)
+ {
+ b = dev->internalStartBlock;
+ }
+
+ if(b < dev->internalStartBlock || b > dev->internalEndBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
+ YBUG();
+ }
+
+ bi = yaffs_GetBlockInfo(dev,b);
+
+ if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+ (bi->pagesInUse - bi->softDeletions )< pagesInUse &&
+ yaffs_BlockNotDisqualifiedFromGC(dev,bi))
+ {
+ dirtiest = b;
+ pagesInUse = (bi->pagesInUse - bi->softDeletions);
+ }
+ }
+
+ dev->currentDirtyChecker = b;
+
+ if(dirtiest > 0)
+ {
+ T(YAFFS_TRACE_GC,(TSTR("GC Selected block %d with %d free" TENDSTR),dirtiest,dev->nChunksPerBlock - pagesInUse));
+ }
+
+ dev->oldestDirtySequence = 0; // clear this
+
+ if(dirtiest > 0)
+ {
+ nonAggressiveSkip = 4;
+ }
+
+ return dirtiest;
+}
+
+
+static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
+{
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
+
+ int erasedOk = 0;
+
+ // If the block is still healthy erase it and mark as clean.
+ // If the block has had a data failure, then retire it.
+ bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+
+ if(!bi->needsRetiring)
+ {
+ erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
+ if(!erasedOk)
+ {
+ dev->nErasureFailures++;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
+ }
+ }
+
+ if(erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE))
+ {
+ int i;
+ for(i = 0; i < dev->nChunksPerBlock; i++)
+ {
+ if(!yaffs_CheckChunkErased(dev,blockNo * dev->nChunksPerBlock + i))
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR(">>Block %d erasure supposedly OK, but chunk %d not erased" TENDSTR),blockNo,i));
+ }
+ }
+ }
+
+ if( erasedOk )
+ {
+ // Clean it up...
+ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ bi->pagesInUse = 0;
+ bi->softDeletions = 0;
+ bi->hasShrinkHeader=0;
+ yaffs_ClearChunkBits(dev,blockNo);
+
+ T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
+ }
+ else
+ {
+ dev->nFreeChunks -= dev->nChunksPerBlock; // We lost a block of free space
+
+ yaffs_RetireBlock(dev,blockNo);
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
+ }
+}
+
+#if 0
+static void yaffs_DumpBlockStats(yaffs_Device *dev)
+{
+ int i,j;
+ yaffs_BlockInfo *bi;
+
+ for(i= dev->internalStartBlock; i <=dev->internalEndBlock; i++)
+ {
+ bi = yaffs_GetBlockInfo(dev,i);
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("%3d state %d shrink %d inuse %d/%d seq %d pages"),i,
+ bi->blockState,bi->hasShrinkHeader,bi->pagesInUse,bi->softDeletions,bi->sequenceNumber));
+
+ for(j = 0; j < dev->nChunksPerBlock; j++)
+ {
+ if(yaffs_CheckChunkBit(dev,i,j))
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR(" %d"),j));
+
+ }
+ }
+ T(YAFFS_TRACE_ALLOCATE,(TSTR(" " TENDSTR)));
+
+ }
+}
+#endif
+
+
+static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
+{
+ int i;
+
+ yaffs_BlockInfo *bi;
+
+#if 0
+ static int j = 0;
+ j++;
+ if(j < 0 || j > 100)
+ {
+ j = 0;
+ yaffs_DumpBlockStats(dev);
+ }
+
+#endif
+
+ if(dev->nErasedBlocks < 1)
+ {
+ // Hoosterman we've got a problem.
+ // Can't get space to gc
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
+
+ return -1;
+ }
+
+ // Find an empty block.
+
+ for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++)
+ {
+ dev->allocationBlockFinder++;
+ if(dev->allocationBlockFinder < dev->internalStartBlock || dev->allocationBlockFinder> dev->internalEndBlock)
+ {
+ dev->allocationBlockFinder = dev->internalStartBlock;
+ }
+
+ bi = yaffs_GetBlockInfo(dev,dev->allocationBlockFinder);
+
+ if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
+ {
+ bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->sequenceNumber++;
+ bi->sequenceNumber = dev->sequenceNumber;
+ dev->nErasedBlocks--;
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("Allocated block %d, seq %d, %d left" TENDSTR),dev->allocationBlockFinder,dev->sequenceNumber, dev->nErasedBlocks));
+ return dev->allocationBlockFinder;
+ }
+ }
+
+
+ T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs tragedy: no more eraased blocks, but there should have been %d" TENDSTR),dev->nErasedBlocks));
+
+
+
+
+
+ return -1;
+}
+
+
+// To determine if we have enough space we just look at the
+// number of erased blocks.
+
+static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
+{
+ int reservedChunks = (dev->nReservedBlocks * dev->nChunksPerBlock);
+ return (dev->nFreeChunks > reservedChunks);
+}
+
+
+static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
+{
+ int retVal;
+ yaffs_BlockInfo *bi;
+
+ if(dev->allocationBlock < 0)
+ {
+ // Get next block to allocate off
+ dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
+ dev->allocationPage = 0;
+ }
+
+ if(!useReserve && !yaffs_CheckSpaceForAllocation(dev))
+ {
+ // Not enough space to allocate unless we're allowed to use the reserve.
+ return -1;
+ }
+
+ if(dev->nErasedBlocks < dev->nReservedBlocks && dev->allocationPage == 0)
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("Allocating reserve" TENDSTR)));
+ }
+
+
+ // Next page please....
+ if(dev->allocationBlock >= 0)
+ {
+ bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
+
+ retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
+ dev->allocationPage;
+ bi->pagesInUse++;
+ yaffs_SetChunkBit(dev,dev->allocationBlock,dev->allocationPage);
+
+ dev->allocationPage++;
+
+ dev->nFreeChunks--;
+
+ // If the block is full set the state to full
+ if(dev->allocationPage >= dev->nChunksPerBlock)
+ {
+ bi->blockState = YAFFS_BLOCK_STATE_FULL;
+ dev->allocationBlock = -1;
+ }
+
+
+ return retVal;
+
+ }
+ T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+ return -1;
+}
+
+
+
+
+static int yaffs_GetErasedChunks(yaffs_Device *dev)
+{
+ int n;
+
+ n = dev->nErasedBlocks * dev->nChunksPerBlock;
+
+ if(dev->allocationBlock> 0)
+ {
+ n += (dev->nChunksPerBlock - dev->allocationPage);
+ }
+
+ return n;
+
+}
+
+static int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
+{
+ int oldChunk;
+ int newChunk;
+ int chunkInBlock;
+ int markNAND;
+ int retVal = YAFFS_OK;
+ int cleanups = 0;
+ int i;
+
+ int chunksBefore = yaffs_GetErasedChunks(dev);
+ int chunksAfter;
+
+ yaffs_ExtendedTags tags;
+
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
+
+ yaffs_Object *object;
+
+ bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
+
+ T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR),block,bi->pagesInUse,bi->hasShrinkHeader));
+ //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
+
+ //yaffs_VerifyFreeChunks(dev);
+
+ bi->hasShrinkHeader = 0; // clear the flag so that the block can erase
+
+ dev->nFreeChunks -= bi->softDeletions; // Take off the number of soft deleted entries because
+ // they're going to get really deleted during GC.
+
+ dev->isDoingGC = 1;
+
+ if(!yaffs_StillSomeChunkBits(dev,block))
+ {
+ T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d that has no chunks in use" TENDSTR),block));
+ yaffs_BlockBecameDirty(dev,block);
+ }
+ else
+ {
+
+ __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+
+ for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
+ chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
+ chunkInBlock++, oldChunk++ )
+ {
+ if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
+ {
+
+ // This page is in use and might need to be copied off
+
+ markNAND = 1;
+
+ //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
+
+ yaffs_InitialiseTags(&tags);
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,oldChunk,buffer, &tags);
+
+ object = yaffs_FindObjectByNumber(dev,tags.objectId);
+
+ T(YAFFS_TRACE_GC_DETAIL,(TSTR("Collecting page %d, %d %d %d " TENDSTR),chunkInBlock,tags.objectId,tags.chunkId,tags.byteCount));
+
+ if(!object)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("page %d in gc has no object " TENDSTR),oldChunk));
+ }
+
+ if(object && object->deleted && tags.chunkId != 0)
+ {
+ // Data chunk in a deleted file, throw it away
+ // It's a soft deleted data chunk,
+ // No need to copy this, just forget about it and fix up the
+ // object.
+
+ //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
+ object->nDataChunks--;
+
+ if(object->nDataChunks <= 0)
+ {
+ // remeber to clean up the object
+ dev->gcCleanupList[cleanups] = tags.objectId;
+ cleanups++;
+ }
+ markNAND = 0;
+ }
+ else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)
+ {
+ // Deleted object header with no data chunks.
+ // Can be discarded and the file deleted.
+ object->chunkId = 0;
+ yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
+ object->variant.fileVariant.top = NULL;
+ yaffs_DoGenericObjectDeletion(object);
+
+ }
+ else if(object)
+ {
+ // It's either a data chunk in a live file or
+ // an ObjectHeader, so we're interested in it.
+ // NB Need to keep the ObjectHeaders of deleted files
+ // until the whole file has been deleted off
+ tags.serialNumber++;
+
+ dev->nGCCopies++;
+
+ if(tags.chunkId == 0)
+ {
+ // It is an object Id,
+ // We need to nuke the shrinkheader flags first
+ // We no longer want the shrinkHeader flag since its work is done
+ // and if it is left in place it will mess up scanning.
+
+ yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
+ oh->isShrink = 0;
+ tags.extraIsShrinkHeader = 0;
+ }
+
+ newChunk = yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags,1);
+
+ if(newChunk < 0)
+ {
+ retVal = YAFFS_FAIL;
+ }
+ else
+ {
+
+ // Ok, now fix up the Tnodes etc.
+
+ if(tags.chunkId == 0)
+ {
+ // It's a header
+ object->chunkId = newChunk;
+ object->serial = tags.serialNumber;
+ }
+ else
+ {
+ // It's a data chunk
+ yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
+ }
+ }
+ }
+
+ yaffs_DeleteChunk(dev,oldChunk,markNAND,__LINE__);
+
+ }
+ }
+
+ yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
+
+ //yaffs_VerifyFreeChunks(dev);
+
+ // Do any required cleanups
+ for(i = 0; i < cleanups; i++)
+ {
+ // Time to delete the file too
+ object = yaffs_FindObjectByNumber(dev,dev->gcCleanupList[i]);
+ if(object)
+ {
+ yaffs_FreeTnode(dev,object->variant.fileVariant.top);
+ object->variant.fileVariant.top = NULL;
+ T(YAFFS_TRACE_GC,(TSTR("yaffs: About to finally delete object %d" TENDSTR),object->objectId));
+ yaffs_DoGenericObjectDeletion(object);
+ }
+
+ }
+
+ }
+
+ if(chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev)))
+ {
+ T(YAFFS_TRACE_GC,(TSTR("gc did not increase free chunks before %d after %d" TENDSTR),chunksBefore,chunksAfter));
+ }
+
+
+ dev->isDoingGC = 0;
+
+ //yaffs_VerifyFreeChunks(dev);
+
+ return YAFFS_OK;
+}
+
+#if 0
+static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
+{
+ // find a file to delete
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ //Scan the unlinked files looking for one to delete
+ list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l->deleted)
+ {
+ return l;
+ }
+ }
+ }
+ return NULL;
+}
+
+
+static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
+{
+ // This does background deletion on unlinked files.. only deleted ones.
+ // If we don't have a file we're working on then find one
+ if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
+ {
+ dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
+ }
+
+ // OK, we're working on a file...
+ if(dev->unlinkedDeletion)
+ {
+ yaffs_Object *obj = dev->unlinkedDeletion;
+ int delresult;
+ int limit; // Number of chunks to delete in a file.
+ // NB this can be exceeded, but not by much.
+
+ limit = -1;
+
+ delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
+
+ if(obj->nDataChunks == 0)
+ {
+ // Done all the deleting of data chunks.
+ // Now dump the header and clean up
+ yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
+ obj->variant.fileVariant.top = NULL;
+ yaffs_DoGenericObjectDeletion(obj);
+ dev->nDeletedFiles--;
+ dev->nUnlinkedFiles--;
+ dev->nBackgroundDeletions++;
+ dev->unlinkedDeletion = NULL;
+ }
+ }
+}
+
+#endif
+
+
+
+// New garbage collector
+// If we're very low on erased blocks then we do aggressive garbage collection
+// otherwise we do "leasurely" garbage collection.
+// Aggressive gc looks further (whole array) and will accept dirtier blocks.
+// Passive gc only inspects smaller areas and will only accept cleaner blocks.
+//
+// The idea is to help clear out space in a more spread-out manner.
+// Dunno if it really does anything useful.
+//
+static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
+{
+ int block;
+ int aggressive;
+ int gcOk = YAFFS_OK;
+ int maxTries = 0;
+
+ //yaffs_VerifyFreeChunks(dev);
+
+ if(dev->isDoingGC)
+ {
+ // Bail out so we don't get recursive gc
+ return YAFFS_OK;
+ }
+
+ // This loop should pass the first time.
+ // We'll only see looping here if the erase of the collected block fails.
+
+ do{
+ maxTries++;
+ if(dev->nErasedBlocks < dev->nReservedBlocks)
+ {
+ // We need a block soon...
+ aggressive = 1;
+ }
+ else
+ {
+ // We're in no hurry
+ aggressive = 0;
+ }
+
+ block = yaffs_FindBlockForGarbageCollection(dev,aggressive);
+
+ if(block > 0)
+ {
+ dev->garbageCollections++;
+ if(!aggressive)
+ {
+ dev->passiveGarbageCollections++;
+ }
+
+ T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive));
+
+ gcOk = yaffs_GarbageCollectBlock(dev,block);
+ }
+
+ if(dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0)
+ {
+ T(YAFFS_TRACE_GC,(TSTR("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d" TENDSTR),dev->nErasedBlocks,maxTries,block));
+ }
+ } while((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0) && (maxTries < 2));
+
+ return aggressive ? gcOk: YAFFS_OK;
+}
+
+
+//////////////////////////// TAGS ///////////////////////////////////////
+
+
+
+#if 0
+
+void yaffs_CalcTagsECC(yaffs_Tags *tags)
+{
+ // Calculate an ecc
+
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+ unsigned i,j;
+ unsigned ecc = 0;
+ unsigned bit = 0;
+
+ tags->ecc = 0;
+
+ for(i = 0; i < 8; i++)
+ {
+ for(j = 1; j &0xff; j<<=1)
+ {
+ bit++;
+ if(b[i] & j)
+ {
+ ecc ^= bit;
+ }
+ }
+ }
+
+ tags->ecc = ecc;
+
+
+}
+
+int yaffs_CheckECCOnTags(yaffs_Tags *tags)
+{
+ unsigned ecc = tags->ecc;
+
+ yaffs_CalcTagsECC(tags);
+
+ ecc ^= tags->ecc;
+
+ if(ecc && ecc <= 64)
+ {
+ // TODO: Handle the failure better. Retire?
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+
+ ecc--;
+
+ b[ecc / 8] ^= (1 << (ecc & 7));
+
+ // Now recvalc the ecc
+ yaffs_CalcTagsECC(tags);
+
+ return 1; // recovered error
+ }
+ else if(ecc)
+ {
+ // Wierd ecc failure value
+ // TODO Need to do somethiong here
+ return -1; //unrecovered error
+ }
+
+ return 0;
+}
+
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+
+ yaffs_CalcTagsECC(tagsPtr);
+
+ sparePtr->tagByte0 = tu->asBytes[0];
+ sparePtr->tagByte1 = tu->asBytes[1];
+ sparePtr->tagByte2 = tu->asBytes[2];
+ sparePtr->tagByte3 = tu->asBytes[3];
+ sparePtr->tagByte4 = tu->asBytes[4];
+ sparePtr->tagByte5 = tu->asBytes[5];
+ sparePtr->tagByte6 = tu->asBytes[6];
+ sparePtr->tagByte7 = tu->asBytes[7];
+}
+
+static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+ int result;
+
+ tu->asBytes[0]= sparePtr->tagByte0;
+ tu->asBytes[1]= sparePtr->tagByte1;
+ tu->asBytes[2]= sparePtr->tagByte2;
+ tu->asBytes[3]= sparePtr->tagByte3;
+ tu->asBytes[4]= sparePtr->tagByte4;
+ tu->asBytes[5]= sparePtr->tagByte5;
+ tu->asBytes[6]= sparePtr->tagByte6;
+ tu->asBytes[7]= sparePtr->tagByte7;
+
+ result = yaffs_CheckECCOnTags(tagsPtr);
+ if(result> 0)
+ {
+ dev->tagsEccFixed++;
+ }
+ else if(result <0)
+ {
+ dev->tagsEccUnfixed++;
+ }
+}
+
+static void yaffs_SpareInitialise(yaffs_Spare *spare)
+{
+ memset(spare,0xFF,sizeof(yaffs_Spare));
+}
+
+#endif
+
+#if 0
+static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve)
+{
+ // NB There must be tags, data is optional
+ // If there is data, then an ECC is calculated on it.
+
+ yaffs_Spare spare;
+
+ if(!tags)
+ {
+ return YAFFS_FAIL;
+ }
+
+ //yaffs_SpareInitialise(&spare);
+
+ //if(!dev->useNANDECC && buffer)
+ //{
+ // yaffs_CalcECC(buffer,&spare);
+ //}
+
+ //yaffs_LoadTagsIntoSpare(&spare,tags);
+
+ return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
+
+}
+#endif
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject)
+{
+ return ( tags->chunkId == chunkInObject &&
+ tags->objectId == objectId &&
+ !tags->chunkDeleted) ? 1 : 0;
+
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+
+static int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_ExtendedTags *tags)
+{
+ //Get the Tnode, then get the level 0 offset chunk offset
+ yaffs_Tnode *tn;
+ int theChunk = -1;
+ yaffs_ExtendedTags localTags;
+ int retVal = -1;
+
+ yaffs_Device *dev = in->myDev;
+
+
+ if(!tags)
+ {
+ // Passed a NULL, so use our own tags space
+ tags = &localTags;
+ }
+
+ tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
+
+ if(tn)
+ {
+ theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
+
+ retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
+ }
+ return retVal;
+}
+
+static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_ExtendedTags *tags)
+{
+ //Get the Tnode, then get the level 0 offset chunk offset
+ yaffs_Tnode *tn;
+ int theChunk = -1;
+ yaffs_ExtendedTags localTags;
+
+ yaffs_Device *dev = in->myDev;
+ int retVal = -1;
+
+ if(!tags)
+ {
+ // Passed a NULL, so use our own tags space
+ tags = &localTags;
+ }
+
+ tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
+
+ if(tn)
+ {
+
+ theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
+
+ retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
+
+ // Delete the entry in the filestructure (if found)
+ if(retVal != -1)
+ {
+ tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
+ }
+ }
+ else
+ {
+ //T(("No level 0 found for %d\n", chunkInInode));
+ }
+
+ if(retVal == -1)
+ {
+ //T(("Could not find %d to delete\n",chunkInInode));
+ }
+ return retVal;
+}
+
+
+#ifdef YAFFS_PARANOID
+
+static int yaffs_CheckFileSanity(yaffs_Object *in)
+{
+ int chunk;
+ int nChunks;
+ int fSize;
+ int failed = 0;
+ int objId;
+ yaffs_Tnode *tn;
+ yaffs_Tags localTags;
+ yaffs_Tags *tags = &localTags;
+ int theChunk;
+ int chunkDeleted;
+
+
+ if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
+ {
+ //T(("Object not a file\n"));
+ return YAFFS_FAIL;
+ }
+
+ objId = in->objectId;
+ fSize = in->variant.fileVariant.fileSize;
+ nChunks = (fSize + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
+
+ for(chunk = 1; chunk <= nChunks; chunk++)
+ {
+ tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
+
+ if(tn)
+ {
+
+ theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
+
+ if(yaffs_CheckChunkBits(dev,theChunk/dev->nChunksPerBlock,theChunk%dev->nChunksPerBlock))
+ {
+
+
+ yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
+ if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
+ {
+ // found it;
+
+ }
+ }
+ else
+ {
+ //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n",
+ // objId,chunk,theChunk,tags->chunkId,tags->objectId);
+
+ failed = 1;
+
+ }
+
+ }
+ else
+ {
+ //T(("No level 0 found for %d\n", chunk));
+ }
+ }
+
+ return failed ? YAFFS_FAIL : YAFFS_OK;
+}
+
+#endif
+
+static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)
+{
+ // NB inScan is zero unless scanning. For forward scanning, inScan is > 0; for backward scanning inScan is < 0
+ yaffs_Tnode *tn;
+ yaffs_Device *dev = in->myDev;
+ int existingChunk;
+ yaffs_ExtendedTags existingTags;
+ yaffs_ExtendedTags newTags;
+ unsigned existingSerial, newSerial;
+
+ if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
+ {
+ // Just ignore an attempt at putting a chunk into a non-file during scanning
+ // If it is not during Scanning then something went wrong!
+ if(!inScan)
+ {
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy:attempt to put data chunk into a non-file" TENDSTR)));
+ YBUG();
+ }
+
+ yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
+ return YAFFS_OK;
+ }
+
+ tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
+ if(!tn)
+ {
+ return YAFFS_FAIL;
+ }
+
+ existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
+
+ if(inScan != 0)
+ {
+ // If we're scanning then we need to test for duplicates
+ // NB This does not need to be efficient since it should only ever
+ // happen when the power fails during a write, then only one
+ // chunk should ever be affected.
+ //
+ // Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+ // Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+
+
+
+ if(existingChunk != 0)
+ {
+ // NB Right now existing chunk will not be real chunkId if the device >= 32MB
+ // thus we have to do a FindChunkInFile to get the real chunk id.
+ //
+ // We have a duplicate now we need to decide which one to use:
+ //
+ // Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+ // Forward scanning YAFFS2: The new one is what we use, dump the old one.
+ // YAFFS1: Get both sets of tags and compare serial numbers.
+ //
+ //
+
+ if(inScan > 0)
+ {
+ // Only do this for forward scanning
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND, NULL,&newTags);
+
+
+ // Do a proper find
+ existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);
+ }
+
+ if(existingChunk <=0)
+ {
+ //Hoosterman - how did this happen?
+
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: existing chunk < 0 in scan" TENDSTR)));
+
+ }
+
+
+ // NB The deleted flags should be false, otherwise the chunks will
+ // not be loaded during a scan
+
+ newSerial = newTags.serialNumber;
+ existingSerial = existingTags.serialNumber;
+
+ if( (inScan > 0) &&
+ ( in->myDev->isYaffs2 ||
+ existingChunk <= 0 ||
+ ((existingSerial+1) & 3) == newSerial))
+ {
+ // Forward scanning.
+ // Use new
+ // Delete the old one and drop through to update the tnode
+ yaffs_DeleteChunk(dev,existingChunk,1,__LINE__);
+ }
+ else
+ {
+ // Backward scanning or we want to use the existing one
+ // Use existing.
+ // Delete the new one and return early so that the tnode isn't changed
+ yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
+ return YAFFS_OK;
+ }
+ }
+
+ }
+
+ if(existingChunk == 0)
+ {
+ in->nDataChunks++;
+ }
+
+ tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
+
+ return YAFFS_OK;
+}
+
+
+
+static int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)
+{
+ int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);
+
+ if(chunkInNAND >= 0)
+ {
+ return yaffs_ReadChunkWithTagsFromNAND(in->myDev,chunkInNAND,buffer,NULL);
+ }
+ else
+ {
+ T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not found zero instead" TENDSTR),chunkInNAND));
+
+ memset(buffer,0,in->myDev->nBytesPerChunk); // get sane data if you read a hole
+ return 0;
+ }
+
+}
+
+
+void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND,int lyn)
+{
+ int block;
+ int page;
+ yaffs_ExtendedTags tags;
+ yaffs_BlockInfo *bi;
+
+ if(chunkId <= 0) return;
+
+ dev->nDeletions++;
+ block = chunkId / dev->nChunksPerBlock;
+ page = chunkId % dev->nChunksPerBlock;
+
+ bi = yaffs_GetBlockInfo(dev,block);
+
+ T(YAFFS_TRACE_DELETION,(TSTR("line %d delete of chunk %d" TENDSTR),lyn,chunkId));
+
+ if(markNAND &&
+ bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
+ !dev->isYaffs2)
+ {
+// yaffs_SpareInitialise(&spare);
+
+#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
+
+ //read data before write, to ensure correct ecc
+ //if we're using MTD verification under Linux
+// yaffs_ReadChunkFromNAND(dev,chunkId,NULL,&spare,0);
+#endif
+
+ yaffs_InitialiseTags(&tags);
+
+ tags.chunkDeleted = 1;
+
+
+ yaffs_WriteChunkWithTagsToNAND(dev,chunkId,NULL,&tags);
+ yaffs_HandleUpdateChunk(dev,chunkId,&tags);
+ }
+ else
+ {
+ dev->nUnmarkedDeletions++;
+ }
+
+
+ // Pull out of the management area.
+ // If the whole block became dirty, this will kick off an erasure.
+ if( bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
+ bi->blockState == YAFFS_BLOCK_STATE_FULL ||
+ bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+ bi->blockState == YAFFS_BLOCK_STATE_COLLECTING)
+ {
+ dev->nFreeChunks++;
+
+ yaffs_ClearChunkBit(dev,block,page);
+
+ bi->pagesInUse--;
+
+ if(bi->pagesInUse == 0 &&
+ !bi->hasShrinkHeader &&
+ bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
+ bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING)
+ {
+ yaffs_BlockBecameDirty(dev,block);
+ }
+
+ }
+ else
+ {
+ // T(("Bad news deleting chunk %d\n",chunkId));
+ }
+
+}
+
+
+
+
+static int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
+{
+ // Find old chunk Need to do this to get serial number
+ // Write new one and patch into tree.
+ // Invalidate old tags.
+
+ int prevChunkId;
+ yaffs_ExtendedTags prevTags;
+
+ int newChunkId;
+ yaffs_ExtendedTags newTags;
+
+ yaffs_Device *dev = in->myDev;
+
+ yaffs_CheckGarbageCollection(dev);
+
+ // Get the previous chunk at this location in the file if it exists
+ prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
+
+ // Set up new tags
+ yaffs_InitialiseTags(&newTags);
+
+ newTags.chunkId = chunkInInode;
+ newTags.objectId = in->objectId;
+ newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
+ newTags.byteCount = nBytes;
+
+// yaffs_CalcTagsECC(&newTags);
+
+ newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);
+
+ if(newChunkId >= 0)
+ {
+ yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);
+
+
+ if(prevChunkId >= 0)
+ {
+ yaffs_DeleteChunk(dev,prevChunkId,1,__LINE__);
+
+ }
+
+ yaffs_CheckFileSanity(in);
+ }
+ return newChunkId;
+
+
+
+
+
+}
+
+
+// UpdateObjectHeader updates the header on NAND for an object.
+// If name is not NULL, then that new name is used.
+//
+int yaffs_UpdateObjectHeader(yaffs_Object *in,const YCHAR *name, int force,int isShrink,int shadows)
+{
+
+ yaffs_BlockInfo *bi;
+
+ yaffs_Device *dev = in->myDev;
+
+ int prevChunkId;
+ int retVal = 0;
+
+ int newChunkId;
+ yaffs_ExtendedTags newTags;
+
+ __u8 *buffer = NULL;
+ YCHAR oldName[YAFFS_MAX_NAME_LENGTH+1];
+
+ // __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
+
+ yaffs_ObjectHeader *oh = NULL;
+ // yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
+
+
+ if(!in->fake || force)
+ {
+
+ yaffs_CheckGarbageCollection(dev);
+
+ buffer = yaffs_GetTempBuffer(in->myDev,__LINE__);
+ oh = (yaffs_ObjectHeader *)buffer;
+
+ prevChunkId = in->chunkId;
+
+ if(prevChunkId >= 0)
+ {
+ yaffs_ReadChunkWithTagsFromNAND(dev,prevChunkId,buffer,NULL);
+ memcpy(oldName,oh->name,sizeof(oh->name));
+ }
+
+ memset(buffer,0xFF,dev->nBytesPerChunk);
+
+ // Header data
+ oh->type = in->variantType;
+
+ oh->yst_mode = in->yst_mode;
+
+ // shadowing
+ oh->shadowsObject = shadows;
+
+#ifdef CONFIG_YAFFS_WINCE
+ oh->win_atime[0] = in->win_atime[0];
+ oh->win_ctime[0] = in->win_ctime[0];
+ oh->win_mtime[0] = in->win_mtime[0];
+ oh->win_atime[1] = in->win_atime[1];
+ oh->win_ctime[1] = in->win_ctime[1];
+ oh->win_mtime[1] = in->win_mtime[1];
+#else
+ oh->yst_uid = in->yst_uid;
+ oh->yst_gid = in->yst_gid;
+ oh->yst_atime = in->yst_atime;
+ oh->yst_mtime = in->yst_mtime;
+ oh->yst_ctime = in->yst_ctime;
+ oh->yst_rdev = in->yst_rdev;
+#endif
+ if(in->parent)
+ {
+ oh->parentObjectId = in->parent->objectId;
+ }
+ else
+ {
+ oh->parentObjectId = 0;
+ }
+
+ //oh->sum = in->sum;
+ if(name && *name)
+ {
+ memset(oh->name,0,sizeof(oh->name));
+ yaffs_strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
+ }
+ else if(prevChunkId)
+ {
+ memcpy(oh->name, oldName,sizeof(oh->name));
+ }
+ else
+ {
+ memset(oh->name,0,sizeof(oh->name));
+ }
+
+ oh->isShrink = isShrink;
+
+ switch(in->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ // Should not happen
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ oh->fileSize = (oh->parentObjectId == YAFFS_OBJECTID_DELETED ||
+ oh->parentObjectId == YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.fileVariant.fileSize;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ yaffs_strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
+ oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+ break;
+ }
+
+ // Tags
+ yaffs_InitialiseTags(&newTags);
+ in->serial++;
+ newTags.chunkId = 0;
+ newTags.objectId = in->objectId;
+ newTags.serialNumber = in->serial;
+
+ // Add extra info for file header
+
+ newTags.extraHeaderInfoAvailable = 1;
+ newTags.extraParentObjectId = oh->parentObjectId;
+ newTags.extraFileLength = oh->fileSize;
+ newTags.extraIsShrinkHeader = oh->isShrink;
+ newTags.extraEquivalentObjectId = oh->equivalentObjectId;
+ newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
+ newTags.extraObjectType = in->variantType;
+
+ // Create new chunk in NAND
+ newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags, (prevChunkId >= 0) ? 1 : 0 );
+
+ if(newChunkId >= 0)
+ {
+
+ in->chunkId = newChunkId;
+
+ if(prevChunkId >= 0)
+ {
+ yaffs_DeleteChunk(dev,prevChunkId,1,__LINE__);
+ }
+
+ in->dirty = 0;
+
+ // If this was a shrink, then mark the block that the chunk lives on
+ if(isShrink)
+ {
+ bi = yaffs_GetBlockInfo(in->myDev,newChunkId / in->myDev->nChunksPerBlock);
+ bi->hasShrinkHeader = 1;
+ }
+
+ }
+
+ retVal = newChunkId;
+
+ }
+
+ if(buffer)
+ yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
+
+ return retVal;
+}
+
+
+/////////////////////// Short Operations Cache ////////////////////////////////
+// In many siturations where there is no high level buffering (eg WinCE) a lot of
+// reads might be short sequential reads, and a lot of writes may be short
+// sequential writes. eg. scanning/writing a jpeg file.
+// In these cases, a short read/write cache can provide a huge perfomance benefit
+// with dumb-as-a-rock code.
+// There are a limited number (~10) of cache chunks per device so that we don't
+// need a very intelligent search.
+
+
+
+
+
+static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
+{
+ yaffs_Device *dev = obj->myDev;
+ int lowest = -99; // Stop compiler whining.
+ int i;
+ yaffs_ChunkCache *cache;
+ int chunkWritten = 0;
+ //int nBytes;
+ int nCaches = obj->myDev->nShortOpCaches;
+
+ if (nCaches > 0)
+ {
+ do{
+ cache = NULL;
+
+ // Find the dirty cache for this object with the lowest chunk id.
+ for(i = 0; i < nCaches; i++)
+ {
+ if(dev->srCache[i].object == obj &&
+ dev->srCache[i].dirty)
+ {
+ if(!cache || dev->srCache[i].chunkId < lowest)
+ {
+ cache = &dev->srCache[i];
+ lowest = cache->chunkId;
+ }
+ }
+ }
+
+ if(cache && !cache->locked)
+ {
+ //Write it out and free it up
+
+#if 0
+ nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
+
+ if(nBytes > YAFFS_BYTES_PER_CHUNK)
+ {
+ nBytes= YAFFS_BYTES_PER_CHUNK;
+ }
+#endif
+ chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
+ cache->chunkId,
+ cache->data,
+ cache->nBytes,1);
+
+ cache->dirty = 0;
+ cache->object = NULL;
+ }
+
+ } while(cache && chunkWritten > 0);
+
+ if(cache)
+ {
+ //Hoosterman, disk full while writing cache out.
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+
+ }
+ }
+
+}
+
+
+// Grab us a chunk for use.
+// First look for an empty one.
+// Then look for the least recently used non-dirty one.
+// Then look for the least recently used dirty one...., flush and look again.
+static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
+{
+ int i;
+ int usage;
+ int theOne;
+
+ if(dev->nShortOpCaches > 0)
+ {
+ for(i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if(!dev->srCache[i].object)
+ {
+ //T(("Grabbing empty %d\n",i));
+
+ //printf("Grabbing empty %d\n",i);
+
+ return &dev->srCache[i];
+ }
+ }
+
+ return NULL;
+
+ theOne = -1;
+ usage = 0; // just to stop the compiler grizzling
+
+ for(i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if(!dev->srCache[i].dirty &&
+ ((dev->srCache[i].lastUse < usage && theOne >= 0)||
+ theOne < 0))
+ {
+ usage = dev->srCache[i].lastUse;
+ theOne = i;
+ }
+ }
+
+ //T(("Grabbing non-empty %d\n",theOne));
+
+ //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
+
+ return theOne >= 0 ? &dev->srCache[theOne] : NULL;
+ }
+ else
+ {
+ return NULL;
+ }
+
+}
+
+
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
+{
+ yaffs_ChunkCache *cache;
+ yaffs_Object *theObj;
+ int usage;
+ int i;
+ int pushout;
+
+ if(dev->nShortOpCaches > 0)
+ {
+ // Try find a non-dirty one...
+
+ cache = yaffs_GrabChunkCacheWorker(dev);
+
+ if(!cache)
+ {
+ // They were all dirty, find the last recently used object and flush
+ // its cache, then find again.
+ // NB what's here is not very accurate, we actually flush the object
+ // the last recently used page.
+
+ // With locking we can't assume we can use entry zero
+
+
+ theObj = NULL;
+ usage = -1;
+ cache = NULL;
+ pushout = -1;
+
+ for(i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if( dev->srCache[i].object &&
+ !dev->srCache[i].locked &&
+ (dev->srCache[i].lastUse < usage || !cache))
+ {
+ usage = dev->srCache[i].lastUse;
+ theObj = dev->srCache[i].object;
+ cache = &dev->srCache[i];
+ pushout = i;
+ }
+ }
+
+ if(!cache || cache->dirty)
+ {
+
+ //printf("Dirty ");
+ yaffs_FlushFilesChunkCache(theObj);
+
+ // Try again
+ cache = yaffs_GrabChunkCacheWorker(dev);
+ }
+ else
+ {
+ //printf(" pushout %d\n",pushout);
+ }
+
+ }
+ return cache;
+ }
+ else
+ return NULL;
+
+}
+
+
+// Find a cached chunk
+static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
+{
+ yaffs_Device *dev = obj->myDev;
+ int i;
+ if(dev->nShortOpCaches > 0)
+ {
+ for(i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if(dev->srCache[i].object == obj &&
+ dev->srCache[i].chunkId == chunkId)
+ {
+ dev->cacheHits++;
+
+ return &dev->srCache[i];
+ }
+ }
+ }
+ return NULL;
+}
+
+// Mark the chunk for the least recently used algorithym
+static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
+{
+
+ if(dev->nShortOpCaches > 0)
+ {
+ if( dev->srLastUse < 0 ||
+ dev->srLastUse > 100000000)
+ {
+ // Reset the cache usages
+ int i;
+ for(i = 1; i < dev->nShortOpCaches; i++)
+ {
+ dev->srCache[i].lastUse = 0;
+ }
+ dev->srLastUse = 0;
+ }
+
+ dev->srLastUse++;
+
+ cache->lastUse = dev->srLastUse;
+
+ if(isAWrite)
+ {
+ cache->dirty = 1;
+ }
+ }
+}
+
+// Invalidate a single cache page.
+// Do this when a whole page gets written,
+// ie the short cache for this page is no longer valid.
+static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
+{
+ if(object->myDev->nShortOpCaches > 0)
+ {
+ yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
+
+ if(cache)
+ {
+ cache->object = NULL;
+ }
+ }
+}
+
+
+// Invalidate all the cache pages associated with this object
+// Do this whenever ther file is deleted or resized.
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
+{
+ int i;
+ yaffs_Device *dev = in->myDev;
+
+ if(dev->nShortOpCaches > 0)
+ {
+ // Now invalidate it.
+ for(i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if(dev->srCache[i].object == in)
+ {
+ dev->srCache[i].object = NULL;
+ }
+ }
+ }
+}
+
+
+
+
+
+///////////////////////// File read/write ///////////////////////////////
+// Read and write have very similar structures.
+// In general the read/write has three parts to it
+// * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+// * Some complete chunks
+// * An incomplete chunk to end off with
+//
+// Curve-balls: the first chunk might also be the last chunk.
+
+int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
+{
+
+
+ int chunk;
+ int start;
+ int nToCopy;
+ int n = nBytes;
+ int nDone = 0;
+ yaffs_ChunkCache *cache;
+
+ yaffs_Device *dev;
+
+ dev = in->myDev;
+
+ while(n > 0)
+ {
+ chunk = offset / dev->nBytesPerChunk + 1; // The first chunk is 1
+ start = offset % dev->nBytesPerChunk;
+
+ // OK now check for the curveball where the start and end are in
+ // the same chunk.
+ if( (start + n) < dev->nBytesPerChunk)
+ {
+ nToCopy = n;
+ }
+ else
+ {
+ nToCopy = dev->nBytesPerChunk - start;
+ }
+
+ cache = yaffs_FindChunkCache(in,chunk);
+
+ // If the chunk is already in the cache or it is less than a whole chunk
+ // then use the cache (if there is caching)
+ // else bypass the cache.
+ if( cache || nToCopy != dev->nBytesPerChunk)
+ {
+ if(dev->nShortOpCaches > 0)
+ {
+
+ // If we can't find the data in the cache, then load it up.
+
+ if(!cache)
+ {
+ cache = yaffs_GrabChunkCache(in->myDev);
+ cache->object = in;
+ cache->chunkId = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
+ cache->nBytes = 0;
+ }
+
+ yaffs_UseChunkCache(dev,cache,0);
+
+ cache->locked = 1;
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(buffer,&cache->data[start],nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ cache->locked = 0;
+ }
+ else
+ {
+ // Read into the local buffer then copy...
+
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
+ yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(buffer,&localBuffer[start],nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+ }
+
+ }
+ else
+ {
+#ifdef CONFIG_YAFFS_WINCE
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
+
+ // Under WinCE can't do direct transfer. Need to use a local buffer.
+ // This is because we otherwise screw up WinCE's memory mapper
+ yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(buffer,localBuffer,dev->nBytesPerChunk);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+ yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+#endif
+
+#else
+ // A full chunk. Read directly into the supplied buffer.
+ yaffs_ReadChunkDataFromObject(in,chunk,buffer);
+#endif
+ }
+
+ n -= nToCopy;
+ offset += nToCopy;
+ buffer += nToCopy;
+ nDone += nToCopy;
+
+ }
+
+ return nDone;
+}
+
+
+
+int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes, int writeThrough)
+{
+
+ int chunk;
+ int start;
+ int nToCopy;
+ int n = nBytes;
+ int nDone = 0;
+ int nToWriteBack;
+ int startOfWrite = offset;
+ int chunkWritten = 0;
+ int nBytesRead;
+
+ yaffs_Device *dev;
+
+ dev = in->myDev;
+
+
+ while(n > 0 && chunkWritten >= 0)
+ {
+ chunk = offset / dev->nBytesPerChunk + 1;
+ start = offset % dev->nBytesPerChunk;
+
+
+ // OK now check for the curveball where the start and end are in
+ // the same chunk.
+
+ if((start + n) < dev->nBytesPerChunk)
+ {
+ nToCopy = n;
+
+ // Now folks, to calculate how many bytes to write back....
+ // If we're overwriting and not writing to then end of file then
+ // we need to write back as much as was there before.
+
+ nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * dev->nBytesPerChunk);
+
+ if(nBytesRead > dev->nBytesPerChunk)
+ {
+ nBytesRead = dev->nBytesPerChunk;
+ }
+
+ nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
+
+ }
+ else
+ {
+ nToCopy = dev->nBytesPerChunk - start;
+ nToWriteBack = dev->nBytesPerChunk;
+ }
+
+ if(nToCopy != dev->nBytesPerChunk)
+ {
+ // An incomplete start or end chunk (or maybe both start and end chunk)
+ if(dev->nShortOpCaches > 0)
+ {
+ yaffs_ChunkCache *cache;
+ // If we can't find the data in the cache, then load it up.
+ cache = yaffs_FindChunkCache(in,chunk);
+ if(!cache && yaffs_CheckSpaceForAllocation(in->myDev))
+ {
+ cache = yaffs_GrabChunkCache(in->myDev);
+ cache->object = in;
+ cache->chunkId = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
+ }
+
+ if(cache)
+ {
+ yaffs_UseChunkCache(dev,cache,1);
+ cache->locked = 1;
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+
+ memcpy(&cache->data[start],buffer,nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ cache->locked = 0;
+ cache->nBytes = nToWriteBack;
+
+ if(writeThrough)
+ {
+ chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
+ cache->chunkId,
+ cache->data,
+ cache->nBytes,1);
+ cache->dirty = 0;
+ }
+
+ }
+ else
+ {
+ chunkWritten = -1; // fail the write
+ }
+ }
+ else
+ {
+ // An incomplete start or end chunk (or maybe both start and end chunk)
+ // Read into the local buffer then copy, then copy over and write back.
+
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
+
+ yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+
+ memcpy(&localBuffer[start],buffer,nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0);
+
+ yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+
+ //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
+ }
+
+ }
+ else
+ {
+
+#ifdef CONFIG_YAFFS_WINCE
+ // Under WinCE can't do direct transfer. Need to use a local buffer.
+ // This is because we otherwise screw up WinCE's memory mapper
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_UnlockYAFFS(TRUE);
+#endif
+ memcpy(localBuffer,buffer,dev->nBytesPerChunk);
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,dev->nBytesPerChunk,0);
+ yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+#else
+ // A full chunk. Write directly from the supplied buffer.
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,dev->nBytesPerChunk,0);
+#endif
+ // Since we've overwritten the cached data, we better invalidate it.
+ yaffs_InvalidateChunkCache(in,chunk);
+ //T(("Write to chunk %d %d\n",chunk,chunkWritten));
+ }
+
+ if(chunkWritten >= 0)
+ {
+ n -= nToCopy;
+ offset += nToCopy;
+ buffer += nToCopy;
+ nDone += nToCopy;
+ }
+
+ }
+
+ // Update file object
+
+ if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
+ {
+ in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+ }
+
+ in->dirty = 1;
+
+ return nDone;
+}
+
+static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
+{
+
+ yaffs_Device *dev = in->myDev;
+ int oldFileSize = in->variant.fileVariant.fileSize;
+
+
+ int lastDel = 1 + (oldFileSize-1)/dev->nBytesPerChunk;
+
+ int startDel = 1 + (newSize + dev->nBytesPerChunk - 1)/
+ dev->nBytesPerChunk;
+ int i;
+ int chunkId;
+
+ // Delete backwards so that we don't end up with holes if
+ // power is lost part-way through the operation.
+ for(i = lastDel; i >= startDel; i--)
+ {
+ // NB this could be optimised somewhat,
+ // eg. could retrieve the tags and write them without
+ // using yaffs_DeleteChunk
+
+ chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
+ if(chunkId > 0)
+ {
+ if(chunkId < (dev->internalStartBlock * dev->nChunksPerBlock) ||
+ chunkId >= ((dev->internalEndBlock+1) * dev->nChunksPerBlock))
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("Found daft chunkId %d for %d"TENDSTR),chunkId,i));
+ }
+ else
+ {
+ in->nDataChunks--;
+ yaffs_DeleteChunk(dev,chunkId,1,__LINE__);
+ }
+ }
+ }
+
+}
+
+int yaffs_ResizeFile(yaffs_Object *in, int newSize)
+{
+
+ int oldFileSize = in->variant.fileVariant.fileSize;
+ int sizeOfPartialChunk;
+ yaffs_Device *dev = in->myDev;
+
+ sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
+
+
+ yaffs_FlushFilesChunkCache(in);
+ yaffs_InvalidateWholeChunkCache(in);
+
+ yaffs_CheckGarbageCollection(dev);
+
+ if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
+ {
+ return yaffs_GetFileSize(in);
+ }
+
+ if(newSize < oldFileSize)
+ {
+
+ yaffs_PruneResizedChunks(in,newSize);
+
+ if(sizeOfPartialChunk != 0)
+ {
+ int lastChunk = 1+ newSize/dev->nBytesPerChunk;
+ __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
+
+ // Got to read and rewrite the last chunk with its new size and zero pad
+ yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer);
+
+ memset(localBuffer + sizeOfPartialChunk,0, dev->nBytesPerChunk - sizeOfPartialChunk);
+
+ yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1);
+
+ yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+ }
+
+ in->variant.fileVariant.fileSize = newSize;
+
+ yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
+
+ // Write a new object header to show we've shrunk the file
+ // Do this only if the file is not in the deleted directories.
+ if(in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+ in->parent->objectId != YAFFS_OBJECTID_DELETED
+ )
+ {
+ yaffs_UpdateObjectHeader(in,NULL, 0, 1,0);
+ }
+
+
+ return newSize;
+
+ }
+ else
+ {
+ return oldFileSize;
+ }
+}
+
+
+loff_t yaffs_GetFileSize(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return obj->variant.fileVariant.fileSize;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return yaffs_strlen(obj->variant.symLinkVariant.alias);
+ default:
+ return 0;
+ }
+}
+
+
+
+// yaffs_FlushFile() updates the file's
+// objectId in NAND
+
+int yaffs_FlushFile(yaffs_Object *in, int updateTime)
+{
+ int retVal;
+ if(in->dirty)
+ {
+ //T(("flushing object header\n"));
+
+ yaffs_FlushFilesChunkCache(in);
+ if(updateTime)
+ {
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(in->win_mtime);
+#else
+
+ in->yst_mtime = Y_CURRENT_TIME;
+
+#endif
+ }
+
+ retVal = (yaffs_UpdateObjectHeader(in,NULL,0,0,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
+ }
+ else
+ {
+ retVal = YAFFS_OK;
+ }
+
+ return retVal;
+
+}
+
+
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
+{
+
+ // First off, invalidate the file's data in the cache, without flushing.
+ yaffs_InvalidateWholeChunkCache(in);
+
+ if(in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir))
+ {
+ // Move to the unlinked directory so we have a record that it was deleted.
+ yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0,0);
+
+ }
+
+
+ yaffs_RemoveObjectFromDirectory(in);
+ yaffs_DeleteChunk(in->myDev,in->chunkId,1,__LINE__);
+ in->chunkId = -1;
+#if 0
+#ifdef __KERNEL__
+ if(in->myInode)
+ {
+ in->myInode->u.generic_ip = NULL;
+ in->myInode = 0;
+ }
+#endif
+#endif
+
+ yaffs_FreeObject(in);
+ return YAFFS_OK;
+
+}
+
+// yaffs_DeleteFile deletes the whole file data
+// and the inode associated with the file.
+// It does not delete the links associated with the file.
+static int yaffs_UnlinkFile(yaffs_Object *in)
+{
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
+
+ // Delete the file data & tnodes
+
+ yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
+
+
+ yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
+
+ return yaffs_DoGenericObjectDeletion(in);
+#else
+ int retVal;
+ int immediateDeletion=0;
+
+ if(1)
+ {
+ //in->unlinked = 1;
+ //in->myDev->nUnlinkedFiles++;
+ //in->renameAllowed = 0;
+#ifdef __KERNEL__
+ if(!in->myInode)
+ {
+ immediateDeletion = 1;
+
+ }
+#else
+ if(in->inUse <= 0)
+ {
+ immediateDeletion = 1;
+
+ }
+#endif
+ if(immediateDeletion)
+ {
+ retVal = yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0,0);
+ T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
+ in->deleted=1;
+ in->myDev->nDeletedFiles++;
+ if( 0 && in->myDev->isYaffs2)
+ {
+ yaffs_ResizeFile(in,0);
+ }
+ yaffs_SoftDeleteFile(in);
+ }
+ else
+ {
+ retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0,0);
+ }
+
+ }
+ return retVal;
+
+
+#endif
+}
+
+int yaffs_DeleteFile(yaffs_Object *in)
+{
+ int retVal = YAFFS_OK;
+
+ if(in->nDataChunks > 0)
+ {
+ // Use soft deletion
+ if(!in->unlinked)
+ {
+ retVal = yaffs_UnlinkFile(in);
+ }
+ if(retVal == YAFFS_OK &&
+ in->unlinked &&
+ !in->deleted)
+ {
+ in->deleted = 1;
+ in->myDev->nDeletedFiles++;
+ yaffs_SoftDeleteFile(in);
+ }
+ return in->deleted ? YAFFS_OK : YAFFS_FAIL;
+ }
+ else
+ {
+ // The file has no data chunks so we toss it immediately
+ yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
+ in->variant.fileVariant.top = NULL;
+ yaffs_DoGenericObjectDeletion(in);
+
+ return YAFFS_OK;
+ }
+}
+
+static int yaffs_DeleteDirectory(yaffs_Object *in)
+{
+ //First check that the directory is empty.
+ if(list_empty(&in->variant.directoryVariant.children))
+ {
+ return yaffs_DoGenericObjectDeletion(in);
+ }
+
+ return YAFFS_FAIL;
+
+}
+
+static int yaffs_DeleteSymLink(yaffs_Object *in)
+{
+ YFREE(in->variant.symLinkVariant.alias);
+
+ return yaffs_DoGenericObjectDeletion(in);
+}
+
+static int yaffs_DeleteHardLink(yaffs_Object *in)
+{
+ // remove this hardlink from the list assocaited with the equivalent
+ // object
+ list_del(&in->hardLinks);
+ return yaffs_DoGenericObjectDeletion(in);
+}
+
+
+static void yaffs_DestroyObject(yaffs_Object *obj)
+{
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break;
+ case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break;
+ case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break;
+ case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen.
+ }
+}
+
+
+static int yaffs_UnlinkWorker(yaffs_Object *obj)
+{
+
+
+ if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+ {
+ return yaffs_DeleteHardLink(obj);
+ }
+ else if(!list_empty(&obj->hardLinks))
+ {
+ // Curve ball: We're unlinking an object that has a hardlink.
+ //
+ // This problem arises because we are not strictly following
+ // The Linux link/inode model.
+ //
+ // We can't really delete the object.
+ // Instead, we do the following:
+ // - Select a hardlink.
+ // - Unhook it from the hard links
+ // - Unhook it from its parent directory (so that the rename can work)
+ // - Rename the object to the hardlink's name.
+ // - Delete the hardlink
+
+
+ yaffs_Object *hl;
+ int retVal;
+ YCHAR name[YAFFS_MAX_NAME_LENGTH+1];
+
+ hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
+
+ list_del_init(&hl->hardLinks);
+ list_del_init(&hl->siblings);
+
+ yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
+
+ retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0,0);
+
+ if(retVal == YAFFS_OK)
+ {
+ retVal = yaffs_DoGenericObjectDeletion(hl);
+ }
+ return retVal;
+
+ }
+ else
+ {
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return yaffs_UnlinkFile(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ return yaffs_DeleteDirectory(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return yaffs_DeleteSymLink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ return yaffs_DoGenericObjectDeletion(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ return YAFFS_FAIL;
+ }
+ }
+}
+
+int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+{
+ yaffs_Object *obj;
+
+ obj = yaffs_FindObjectByName(dir,name);
+
+ if(obj && obj->unlinkAllowed)
+ {
+ return yaffs_UnlinkWorker(obj);
+ }
+
+ return YAFFS_FAIL;
+
+}
+
+//////////////// Initialisation Scanning /////////////////
+
+
+void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId, int backwardScanning)
+{
+ //Todo
+}
+
+#if 0
+// For now we use the SmartMedia check.
+// We look at the blockStatus byte in the first two chunks
+// These must be 0xFF to pass as OK.
+// todo: this function needs to be modifyable foir different NAND types
+// and different chunk sizes. Suggest make this into a per-device configurable
+// function.
+static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
+{
+ yaffsExtendedTags *tags;
+
+ yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&tags,1);
+#if 1
+ if(yaffs_CountBits(spare.blockStatus) < 7)
+ {
+ return 1;
+ }
+#else
+ if(spare.blockStatus != 0xFF)
+ {
+ return 1;
+ }
+#endif
+ yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
+
+#if 1
+ if(yaffs_CountBits(spare.blockStatus) < 7)
+ {
+ return 1;
+ }
+#else
+ if(spare.blockStatus != 0xFF)
+ {
+ return 1;
+ }
+#endif
+
+ return 0;
+
+}
+
+#endif
+
+
+typedef struct
+{
+ int seq;
+ int block;
+} yaffs_BlockIndex;
+
+
+
+static int yaffs_Scan(yaffs_Device *dev)
+{
+ yaffs_ExtendedTags tags;
+ int blk;
+ int blockIterator;
+ int startIterator;
+ int endIterator;
+ int nBlocksToScan = 0;
+
+ int chunk;
+ int c;
+ int deleted;
+ yaffs_BlockState state;
+ yaffs_Object *hardList = NULL;
+ yaffs_Object *hl;
+ yaffs_BlockInfo *bi;
+ int sequenceNumber;
+ yaffs_ObjectHeader *oh;
+ yaffs_Object *in;
+ yaffs_Object *parent;
+ int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+
+ __u8 *chunkData;
+
+ yaffs_BlockIndex *blockIndex = NULL;
+
+ T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),dev->internalStartBlock,dev->internalEndBlock));
+
+ chunkData = yaffs_GetTempBuffer(dev,__LINE__);
+
+
+ dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+ if(dev->isYaffs2)
+ {
+ blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+ }
+
+
+ // Scan all the blocks to determine their state
+ for(blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++)
+ {
+ bi = yaffs_GetBlockInfo(dev,blk);
+ yaffs_ClearChunkBits(dev,blk);
+ bi->pagesInUse = 0;
+ bi->softDeletions = 0;
+
+ yaffs_QueryInitialBlockState(dev,blk,&state,&sequenceNumber);
+
+ bi->blockState = state;
+ bi->sequenceNumber = sequenceNumber;
+
+ T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
+
+ if(state == YAFFS_BLOCK_STATE_DEAD)
+ {
+ T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
+ }
+ else if(state == YAFFS_BLOCK_STATE_EMPTY)
+ {
+ T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
+ dev->nErasedBlocks++;
+ dev->nFreeChunks += dev->nChunksPerBlock;
+ }
+ else if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
+ {
+
+ // Determine the highest sequence number
+ if( dev->isYaffs2 &&
+ sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+ sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER)
+ {
+
+ blockIndex[nBlocksToScan].seq = sequenceNumber;
+ blockIndex[nBlocksToScan].block = blk;
+
+ nBlocksToScan++;
+
+ if(sequenceNumber >= dev->sequenceNumber)
+ {
+ dev->sequenceNumber = sequenceNumber;
+ }
+ }
+ else if(dev->isYaffs2)
+ {
+ // TODO: Nasty sequence number!
+ T(YAFFS_TRACE_SCAN,(TSTR("Block scanning block %d has bad sequence number %d" TENDSTR),blk,sequenceNumber));
+
+ }
+ }
+ }
+
+ // Sort the blocks
+ // Dungy old bubble sort for now...
+ if(dev->isYaffs2)
+ {
+ yaffs_BlockIndex temp;
+ int i;
+ int j;
+
+ for(i = 0; i < nBlocksToScan; i++)
+ for(j = i+1; j < nBlocksToScan; j++)
+ if(blockIndex[i].seq > blockIndex[j].seq)
+ {
+ temp = blockIndex[j];
+ blockIndex[j] = blockIndex[i];
+ blockIndex[i] = temp;
+ }
+ }
+
+
+ // Now scan the blocks looking at the data.
+ if(dev->isYaffs2)
+ {
+ startIterator = 0;
+ endIterator = nBlocksToScan-1;
+ T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
+ }
+ else
+ {
+ startIterator = dev->internalStartBlock;
+ endIterator = dev->internalEndBlock;
+ }
+
+ // For each block....
+ for(blockIterator = startIterator; blockIterator <= endIterator; blockIterator++)
+ {
+
+ if(dev->isYaffs2)
+ {
+ // get the block to scan in the correct order
+ blk = blockIndex[blockIterator].block;
+ }
+ else
+ {
+ blk = blockIterator;
+ }
+
+
+ bi = yaffs_GetBlockInfo(dev,blk);
+ state = bi->blockState;
+
+ deleted = 0;
+
+ // For each chunk in each block that needs scanning....
+ for(c = 0; c < dev->nChunksPerBlock &&
+ state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++)
+ {
+ // Read the tags and decide what to do
+ chunk = blk * dev->nChunksPerBlock + c;
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
+
+ // Let's have a good look at this chunk...
+
+
+ if(!dev->isYaffs2 && tags.chunkDeleted)
+ {
+ // YAFFS1 only...
+ // A deleted chunk
+ deleted++;
+ dev->nFreeChunks ++;
+ //T((" %d %d deleted\n",blk,c));
+ }
+ else if(!tags.chunkUsed)
+ {
+ // An unassigned chunk in the block
+ // This means that either the block is empty or
+ // this is the one being allocated from
+
+ if(c == 0)
+ {
+ // We're looking at the first chunk in the block so the block is unused
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ }
+ else
+ {
+ // this is the block being allocated from
+ T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
+ state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->allocationBlock = blk;
+ dev->allocationPage = c;
+ dev->allocationBlockFinder = blk; // Set it to here to encourage the allocator to
+ // go forth from here.
+ //Yaffs2 sanity check:
+ // This should be the one with the highest sequence number
+ if(dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber))
+ {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d" TENDSTR),
+ blk,bi->sequenceNumber,dev->sequenceNumber));
+ }
+ }
+
+ dev->nFreeChunks += (dev->nChunksPerBlock - c);
+ }
+ else if(tags.chunkId > 0)
+ {
+ // chunkId > 0 so it is a data chunk...
+ unsigned int endpos;
+
+ yaffs_SetChunkBit(dev,blk,c);
+ bi->pagesInUse++;
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
+ // PutChunkIntoFile checks for a clash (two data chunks with
+ // the same chunkId).
+ yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
+ endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
+ if(in->variantType == YAFFS_OBJECT_TYPE_FILE && in->variant.fileVariant.scannedFileSize <endpos)
+ {
+ in->variant.fileVariant.scannedFileSize = endpos;
+ if(!dev->useHeaderFileSize)
+ {
+ in->variant.fileVariant.fileSize = in->variant.fileVariant.scannedFileSize;
+ }
+
+ }
+ //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
+ }
+ else
+ {
+ // chunkId == 0, so it is an ObjectHeader.
+ // Thus, we read in the object header and make the object
+ yaffs_SetChunkBit(dev,blk,c);
+ bi->pagesInUse++;
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
+
+ oh = (yaffs_ObjectHeader *)chunkData;
+
+ in = yaffs_FindObjectByNumber(dev,tags.objectId);
+ if(in && in->variantType != oh->type)
+ {
+ // This should not happen, but somehow
+ // Wev'e ended up with an objectId that has been reused but not yet
+ // deleted, and worse still it has changed type. Delete the old object.
+
+ yaffs_DestroyObject(in);
+
+ in = 0;
+ }
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
+
+ if(oh->shadowsObject > 0)
+ {
+ yaffs_HandleShadowedObject(dev,oh->shadowsObject,0);
+ }
+
+ if(in->valid)
+ {
+ // We have already filled this one. We have a duplicate and need to resolve it.
+
+ unsigned existingSerial = in->serial;
+ unsigned newSerial = tags.serialNumber;
+
+ if( dev->isYaffs2 ||
+ ((existingSerial+1) & 3) == newSerial)
+ {
+ // Use new one - destroy the exisiting one
+ yaffs_DeleteChunk(dev,in->chunkId,1,__LINE__);
+ in->valid = 0;
+ }
+ else
+ {
+ // Use existing - destroy this one.
+ yaffs_DeleteChunk(dev,chunk,1,__LINE__);
+ }
+ }
+
+ if(!in->valid &&
+ (tags.objectId == YAFFS_OBJECTID_ROOT ||
+ tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
+ {
+ // We only load some info, don't fiddle with directory structure
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->yst_uid = oh->yst_uid;
+ in->yst_gid = oh->yst_gid;
+ in->yst_atime = oh->yst_atime;
+ in->yst_mtime = oh->yst_mtime;
+ in->yst_ctime = oh->yst_ctime;
+ in->yst_rdev = oh->yst_rdev;
+#endif
+ in->chunkId = chunk;
+
+ }
+ else if(!in->valid)
+ {
+ // we need to load this info
+
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->yst_uid = oh->yst_uid;
+ in->yst_gid = oh->yst_gid;
+ in->yst_atime = oh->yst_atime;
+ in->yst_mtime = oh->yst_mtime;
+ in->yst_ctime = oh->yst_ctime;
+ in->yst_rdev = oh->yst_rdev;
+#endif
+ in->chunkId = chunk;
+
+ yaffs_SetObjectName(in,oh->name);
+ in->dirty = 0;
+
+ // directory stuff...
+ // hook up to parent
+
+ parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
+ if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
+ {
+ // Set up as a directory
+ parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
+ INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
+ }
+ else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ // Hoosterman, another problem....
+ // We're trying to use a non-directory as a directory
+
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
+ parent = dev->lostNFoundDir;
+ }
+
+ yaffs_AddObjectToDirectory(parent,in);
+
+ if(0 && (parent == dev->deletedDir ||
+ parent == dev->unlinkedDir))
+ {
+ in->deleted = 1; // If it is unlinked at start up then it wants deleting
+ dev->nDeletedFiles++;
+ }
+
+ // Note re hardlinks.
+ // Since we might scan a hardlink before its equivalent object is scanned
+ // we put them all in a list.
+ // After scanning is complete, we should have all the objects, so we run through this
+ // list and fix up all the chains.
+
+ switch(in->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ if(dev->isYaffs2 && oh->isShrink)
+ {
+ // Prune back the shrunken chunks
+ yaffs_PruneResizedChunks(in,oh->fileSize);
+ // Mark the block as having a shrinkHeader
+ bi->hasShrinkHeader = 1;
+ }
+
+ if(dev->useHeaderFileSize)
+
+ in->variant.fileVariant.fileSize = oh->fileSize;
+
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
+ in->hardLinks.next = (struct list_head *)hardList;
+ hardList = in;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing
+ in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
+ break;
+ }
+
+ if(parent == dev->deletedDir)
+ {
+ yaffs_DestroyObject(in);
+ bi->hasShrinkHeader = 1;
+ }
+ //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
+ }
+ }
+ }
+
+ if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
+ {
+ // If we got this far while scanning, then the block is fully allocated.
+ state = YAFFS_BLOCK_STATE_FULL;
+ }
+
+ bi->blockState = state;
+
+ // Now let's see if it was dirty
+ if( bi->pagesInUse == 0 &&
+ !bi->hasShrinkHeader &&
+ bi->blockState == YAFFS_BLOCK_STATE_FULL)
+ {
+ yaffs_BlockBecameDirty(dev,blk);
+ }
+
+ }
+
+ if(blockIndex)
+ {
+ YFREE(blockIndex);
+ }
+
+ // Ok, we've done all the scanning.
+
+ // Fix up the hard link chains.
+ // We should now have scanned all the objects, now it's time to add these
+ // hardlinks.
+ while(hardList)
+ {
+ hl = hardList;
+ hardList = (yaffs_Object *)(hardList->hardLinks.next);
+
+ in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
+
+ if(in)
+ {
+ // Add the hardlink pointers
+ hl->variant.hardLinkVariant.equivalentObject=in;
+ list_add(&hl->hardLinks,&in->hardLinks);
+ }
+ else
+ {
+ //Todo Need to report/handle this better.
+ // Got a problem... hardlink to a non-existant object
+ hl->variant.hardLinkVariant.equivalentObject=NULL;
+ INIT_LIST_HEAD(&hl->hardLinks);
+
+ }
+
+ }
+
+ // Handle the unlinked files. Since they were left in an unlinked state we should
+ // just delete them.
+ {
+ struct list_head *i;
+ struct list_head *n;
+
+ yaffs_Object *l;
+ // Soft delete all the unlinked files
+ list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ yaffs_DestroyObject(l);
+ }
+ }
+ }
+
+ yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
+
+ T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan ends" TENDSTR)));
+
+ return YAFFS_OK;
+}
+
+
+static int yaffs_ScanBackwards(yaffs_Device *dev)
+{
+ yaffs_ExtendedTags tags;
+ int blk;
+ int blockIterator;
+ int startIterator;
+ int endIterator;
+ int nBlocksToScan = 0;
+
+ int chunk;
+ int c;
+ int deleted;
+ yaffs_BlockState state;
+ yaffs_Object *hardList = NULL;
+ yaffs_Object *hl;
+ yaffs_BlockInfo *bi;
+ int sequenceNumber;
+ yaffs_ObjectHeader *oh;
+ yaffs_Object *in;
+ yaffs_Object *parent;
+ int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+
+ __u8 *chunkData;
+
+ yaffs_BlockIndex *blockIndex = NULL;
+
+
+ if(!dev->isYaffs2)
+ {
+ T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards starts intstartblk %d intendblk %d..." TENDSTR),dev->internalStartBlock,dev->internalEndBlock));
+
+ chunkData = yaffs_GetTempBuffer(dev,__LINE__);
+
+
+ dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+ blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+
+
+ // Scan all the blocks to determine their state
+ for(blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++)
+ {
+ bi = yaffs_GetBlockInfo(dev,blk);
+ yaffs_ClearChunkBits(dev,blk);
+ bi->pagesInUse = 0;
+ bi->softDeletions = 0;
+
+ yaffs_QueryInitialBlockState(dev,blk,&state,&sequenceNumber);
+
+ bi->blockState = state;
+ bi->sequenceNumber = sequenceNumber;
+
+ T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
+
+ if(state == YAFFS_BLOCK_STATE_DEAD)
+ {
+ T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
+ }
+ else if(state == YAFFS_BLOCK_STATE_EMPTY)
+ {
+ T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
+ dev->nErasedBlocks++;
+ dev->nFreeChunks += dev->nChunksPerBlock;
+ }
+ else if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
+ {
+
+ // Determine the highest sequence number
+ if( dev->isYaffs2 &&
+ sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+ sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER)
+ {
+
+ blockIndex[nBlocksToScan].seq = sequenceNumber;
+ blockIndex[nBlocksToScan].block = blk;
+
+ nBlocksToScan++;
+
+ if(sequenceNumber >= dev->sequenceNumber)
+ {
+ dev->sequenceNumber = sequenceNumber;
+ }
+ }
+ else if(dev->isYaffs2)
+ {
+ // TODO: Nasty sequence number!
+ T(YAFFS_TRACE_SCAN,(TSTR("Block scanning block %d has bad sequence number %d" TENDSTR),blk,sequenceNumber));
+
+ }
+ }
+ }
+
+ // Sort the blocks
+ // Dungy old bubble sort for now...
+ {
+ yaffs_BlockIndex temp;
+ int i;
+ int j;
+
+ for(i = 0; i < nBlocksToScan; i++)
+ for(j = i+1; j < nBlocksToScan; j++)
+ if(blockIndex[i].seq > blockIndex[j].seq)
+ {
+ temp = blockIndex[j];
+ blockIndex[j] = blockIndex[i];
+ blockIndex[i] = temp;
+ }
+ }
+
+
+ // Now scan the blocks looking at the data.
+ startIterator = 0;
+ endIterator = nBlocksToScan-1;
+ T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
+
+
+ // For each block.... backwards
+ for(blockIterator = endIterator; blockIterator >= startIterator; blockIterator--)
+ {
+
+ // get the block to scan in the correct order
+ blk = blockIndex[blockIterator].block;
+
+
+ bi = yaffs_GetBlockInfo(dev,blk);
+ state = bi->blockState;
+
+ deleted = 0;
+
+ if( 0 && // Disable since this is redundant.
+ state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
+ {
+ // Let's look at the first chunk in the block
+ chunk = blk * dev->nChunksPerBlock;
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
+
+ // Let's have a good look at this chunk...
+
+ if(!tags.chunkUsed)
+ {
+ // An unassigned chunk in the block
+ // This means that either the block is empty or
+ // this is the one being allocated from
+
+ // We're looking at the first chunk in the block so the block is unused
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ dev->nFreeChunks += dev->nChunksPerBlock;
+ }
+
+ }
+
+ // For each chunk in each block that needs scanning....
+ for(c = dev->nChunksPerBlock-1; c >= 0 &&
+ (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+ state == YAFFS_BLOCK_STATE_ALLOCATING); c--)
+ {
+ // Scan backwards...
+ // Read the tags and decide what to do
+ chunk = blk * dev->nChunksPerBlock + c;
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
+
+ // Let's have a good look at this chunk...
+
+ if(!tags.chunkUsed)
+ {
+ // An unassigned chunk in the block
+ // This means that either the block is empty or
+ // this is the one being allocated from
+
+ if(c == 0)
+ {
+ // We're looking at the first chunk in the block so the block is unused
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ }
+ else
+ {
+ // this is the block being allocated from
+ if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
+ {
+ T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
+ }
+ state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->allocationBlock = blk;
+ dev->allocationPage = c;
+ dev->allocationBlockFinder = blk; // Set it to here to encourage the allocator to
+ // go forth from here.
+ //Yaffs2 sanity check:
+ // This should be the one with the highest sequence number
+ if(dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber))
+ {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d" TENDSTR),
+ blk,bi->sequenceNumber,dev->sequenceNumber));
+ }
+ }
+
+ dev->nFreeChunks ++;
+ }
+ else if(tags.chunkId > 0)
+ {
+ // chunkId > 0 so it is a data chunk...
+ unsigned int endpos;
+
+ __u32 chunkBase = (tags.chunkId - 1)* dev->nBytesPerChunk;
+
+ yaffs_SetChunkBit(dev,blk,c);
+ bi->pagesInUse++;
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
+ if(in->variantType == YAFFS_OBJECT_TYPE_FILE &&
+ chunkBase < in->variant.fileVariant.shrinkSize)
+ {
+ // This has not been invalidated by a resize
+ yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,-1);
+
+
+ // File size is calculated by looking at the data chunks if we have not
+ // seen an object header yet. Stop this practice once we find an object header.
+ endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
+ if(!in->valid && // have not got an object header yet
+ in->variant.fileVariant.scannedFileSize <endpos)
+ {
+ in->variant.fileVariant.scannedFileSize = endpos;
+ in->variant.fileVariant.fileSize = in->variant.fileVariant.scannedFileSize;
+ }
+
+ }
+ else
+ {
+ // This chunk has been invalidated by a resize, so delete
+ yaffs_DeleteChunk(dev,chunk,1,__LINE__);
+
+
+ }
+ //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
+ }
+ else
+ {
+ // chunkId == 0, so it is an ObjectHeader.
+ // Thus, we read in the object header and make the object
+ yaffs_SetChunkBit(dev,blk,c);
+ bi->pagesInUse++;
+
+ oh = NULL;
+ in = NULL;
+
+ if(tags.extraHeaderInfoAvailable)
+ {
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,tags.extraObjectType);
+ }
+
+
+ if(!in || !in->valid)
+ {
+
+ // If we don't have valid info then we need to read the chunk
+ // TODO In future we can probably defer reading the chunk and
+ // living with invalid data until needed.
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
+
+ oh = (yaffs_ObjectHeader *)chunkData;
+
+ if(!in)
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
+
+ }
+
+ if(!in)
+ {
+ // TODO Hoosterman we have a problem!
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: Could not make object for object %d at chunk %d during scan" TENDSTR),tags.objectId,chunk));
+
+ }
+
+ if(in->valid)
+ {
+ // We have already filled this one. We have a duplicate that will be discarded, but
+ // we first have to suck out resize info if it is a file.
+
+ if( (in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
+ ((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
+ (tags.extraHeaderInfoAvailable && tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
+ )
+ {
+ __u32 thisSize = (oh) ? oh->fileSize : tags.extraFileLength;
+ __u32 parentObjectId = (oh) ? oh->parentObjectId : tags.extraParentObjectId;
+ unsigned isShrink = (oh) ? oh->isShrink : tags.extraIsShrinkHeader;
+
+ // If it is deleted (unlinked at start also means deleted)
+ // we treat the file size as being zeroed at this point.
+ if(parentObjectId == YAFFS_OBJECTID_DELETED ||
+ parentObjectId == YAFFS_OBJECTID_UNLINKED)
+ {
+ thisSize = 0;
+ isShrink = 1;
+ }
+
+ if(isShrink &&
+ in->variant.fileVariant.shrinkSize > thisSize)
+ {
+ in->variant.fileVariant.shrinkSize = thisSize;
+ }
+
+ if(isShrink)
+ {
+ bi->hasShrinkHeader = 1;
+ }
+
+ }
+ // Use existing - destroy this one.
+ yaffs_DeleteChunk(dev,chunk,1,__LINE__);
+
+ }
+
+ if(!in->valid &&
+ (tags.objectId == YAFFS_OBJECTID_ROOT ||
+ tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
+ {
+ // We only load some info, don't fiddle with directory structure
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->yst_uid = oh->yst_uid;
+ in->yst_gid = oh->yst_gid;
+ in->yst_atime = oh->yst_atime;
+ in->yst_mtime = oh->yst_mtime;
+ in->yst_ctime = oh->yst_ctime;
+ in->yst_rdev = oh->yst_rdev;
+#endif
+ in->chunkId = chunk;
+
+ }
+ else if(!in->valid)
+ {
+ // we need to load this info
+
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->yst_uid = oh->yst_uid;
+ in->yst_gid = oh->yst_gid;
+ in->yst_atime = oh->yst_atime;
+ in->yst_mtime = oh->yst_mtime;
+ in->yst_ctime = oh->yst_ctime;
+ in->yst_rdev = oh->yst_rdev;
+#endif
+ in->chunkId = chunk;
+
+ if(oh->shadowsObject > 0)
+ {
+ yaffs_HandleShadowedObject(dev,oh->shadowsObject,0);
+ }
+
+
+ yaffs_SetObjectName(in,oh->name);
+ in->dirty = 0;
+
+ // directory stuff...
+ // hook up to parent
+
+ parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
+ if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
+ {
+ // Set up as a directory
+ parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
+ INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
+ }
+ else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ // Hoosterman, another problem....
+ // We're trying to use a non-directory as a directory
+
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
+ parent = dev->lostNFoundDir;
+ }
+
+ yaffs_AddObjectToDirectory(parent,in);
+
+ if((parent == dev->deletedDir ||
+ parent == dev->unlinkedDir))
+ {
+ in->deleted = 1; // If it is unlinked at start up then it wants deleting
+ }
+
+ if( oh->isShrink)
+ {
+ // Mark the block as having a shrinkHeader
+ bi->hasShrinkHeader = 1;
+ }
+
+
+ // Note re hardlinks.
+ // Since we might scan a hardlink before its equivalent object is scanned
+ // we put them all in a list.
+ // After scanning is complete, we should have all the objects, so we run through this
+ // list and fix up all the chains.
+
+ switch(in->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+
+
+ if(in->variant.fileVariant.scannedFileSize < oh->fileSize)
+ {
+ in->variant.fileVariant.fileSize = oh->fileSize;
+ in->variant.fileVariant.scannedFileSize = in->variant.fileVariant.fileSize;
+ }
+
+ if(oh->isShrink &&
+ in->variant.fileVariant.shrinkSize > oh->fileSize)
+ {
+ in->variant.fileVariant.shrinkSize = oh->fileSize;
+ }
+
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
+ in->hardLinks.next = (struct list_head *)hardList;
+ hardList = in;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing
+ in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
+ break;
+ }
+
+#if 0
+ if(parent == dev->deletedDir)
+ {
+ yaffs_DestroyObject(in);
+ bi->hasShrinkHeader = 1;
+ }
+#endif
+ //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
+ }
+ }
+ }
+
+ if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
+ {
+ // If we got this far while scanning, then the block is fully allocated.
+ state = YAFFS_BLOCK_STATE_FULL;
+ }
+
+ bi->blockState = state;
+
+ // Now let's see if it was dirty
+ if( bi->pagesInUse == 0 &&
+ !bi->hasShrinkHeader &&
+ bi->blockState == YAFFS_BLOCK_STATE_FULL)
+ {
+ yaffs_BlockBecameDirty(dev,blk);
+ }
+
+ }
+
+ if(blockIndex)
+ {
+ YFREE(blockIndex);
+ }
+
+ // Ok, we've done all the scanning.
+
+ // Fix up the hard link chains.
+ // We should now have scanned all the objects, now it's time to add these
+ // hardlinks.
+ while(hardList)
+ {
+ hl = hardList;
+ hardList = (yaffs_Object *)(hardList->hardLinks.next);
+
+ in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
+
+ if(in)
+ {
+ // Add the hardlink pointers
+ hl->variant.hardLinkVariant.equivalentObject=in;
+ list_add(&hl->hardLinks,&in->hardLinks);
+ }
+ else
+ {
+ //Todo Need to report/handle this better.
+ // Got a problem... hardlink to a non-existant object
+ hl->variant.hardLinkVariant.equivalentObject=NULL;
+ INIT_LIST_HEAD(&hl->hardLinks);
+
+ }
+
+ }
+
+ {
+ struct list_head *i;
+ struct list_head *n;
+
+ yaffs_Object *l;
+
+ // Soft delete all the unlinked files
+ list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ yaffs_DestroyObject(l);
+ }
+ }
+
+ // Soft delete all the deletedDir files
+ list_for_each_safe(i,n,&dev->deletedDir->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ yaffs_DestroyObject(l);
+
+ }
+ }
+ }
+
+ yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
+
+ T(YAFFS_TRACE_SCAN,(TSTR("yaffs_ScanBackwards ends" TENDSTR)));
+
+ return YAFFS_OK;
+}
+
+
+
+////////////////////////// Directory Functions /////////////////////////
+
+
+static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
+{
+
+ if(!directory)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: Trying to add an object to a null pointer directory" TENDSTR)));
+ YBUG();
+ }
+ if(directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: Trying to add an object to a non-directory" TENDSTR)));
+ YBUG();
+ }
+
+ if(obj->siblings.prev == NULL)
+ {
+ // Not initialised
+ INIT_LIST_HEAD(&obj->siblings);
+
+ }
+ else if(!list_empty(&obj->siblings))
+ {
+ // If it is holed up somewhere else, un hook it
+ list_del_init(&obj->siblings);
+ }
+ // Now add it
+ list_add(&obj->siblings,&directory->variant.directoryVariant.children);
+ obj->parent = directory;
+
+ if(directory == obj->myDev->unlinkedDir || directory == obj->myDev->deletedDir)
+ {
+ obj->unlinked = 1;
+ obj->myDev->nUnlinkedFiles++;
+ obj->renameAllowed = 0;
+ }
+}
+
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
+{
+ list_del_init(&obj->siblings);
+ obj->parent = NULL;
+}
+
+yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const YCHAR *name)
+{
+ int sum;
+
+ struct list_head *i;
+ YCHAR buffer[YAFFS_MAX_NAME_LENGTH+1];
+
+ yaffs_Object *l;
+
+ if(!name)
+ {
+ return NULL;
+ }
+
+ if(!directory)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: null pointer directory"TENDSTR)));
+ YBUG();
+ }
+ if(directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: non-directory"TENDSTR)));
+ YBUG();
+ }
+
+ sum = yaffs_CalcNameSum(name);
+
+ list_for_each(i,&directory->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+
+ // Special case for lost-n-found
+ if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
+ {
+ if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
+ {
+ return l;
+ }
+ }
+ else if(yaffs_SumCompare(l->sum, sum)||
+ l->chunkId <= 0) //LostnFound cunk called Objxxx
+ {
+ // Do a real check
+ yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
+ if(yaffs_strcmp(name,buffer) == 0)
+ {
+ return l;
+ }
+
+ }
+ }
+ }
+
+ return NULL;
+}
+
+
+int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
+{
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ if(!theDir)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: null pointer directory"TENDSTR)));
+ YBUG();
+ }
+ if(theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("tragedy: yaffs_FindObjectByName: non-directory"TENDSTR)));
+ YBUG();
+ }
+
+ list_for_each(i,&theDir->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l && !fn(l))
+ {
+ return YAFFS_FAIL;
+ }
+ }
+ }
+
+ return YAFFS_OK;
+
+}
+
+
+// GetEquivalentObject dereferences any hard links to get to the
+// actual object.
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
+{
+ if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+ {
+ // We want the object id of the equivalent object, not this one
+ obj = obj->variant.hardLinkVariant.equivalentObject;
+ }
+ return obj;
+
+}
+
+int yaffs_GetObjectName(yaffs_Object *obj,YCHAR *name,int buffSize)
+{
+ memset(name,0,buffSize * sizeof(YCHAR));
+
+ if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
+ {
+ yaffs_strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
+ }
+ else if(obj->chunkId <= 0)
+ {
+ YCHAR locName[20];
+ // make up a name
+ yaffs_sprintf(locName,_Y("%s%d"),YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
+ yaffs_strncpy(name,locName,buffSize - 1);
+
+ }
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+ else if(obj->shortName[0])
+ {
+ yaffs_strcpy(name,obj->shortName);
+ }
+#endif
+ else
+ {
+ __u8 *buffer = yaffs_GetTempBuffer(obj->myDev,__LINE__);
+
+ yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
+
+ memset(buffer,0,obj->myDev->nBytesPerChunk);
+
+ if(obj->chunkId >= 0)
+ {
+ yaffs_ReadChunkWithTagsFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
+ }
+ yaffs_strncpy(name,oh->name,buffSize - 1);
+
+ yaffs_ReleaseTempBuffer(obj->myDev,buffer,__LINE__);
+ }
+
+ return yaffs_strlen(name);
+}
+
+int yaffs_GetObjectFileLength(yaffs_Object *obj)
+{
+
+ // Dereference any hard linking
+ obj = yaffs_GetEquivalentObject(obj);
+
+ if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+ {
+ return obj->variant.fileVariant.fileSize;
+ }
+ if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+ {
+ return yaffs_strlen(obj->variant.symLinkVariant.alias);
+ }
+ else
+ {
+ // Only a directory should drop through to here
+ return obj->myDev->nBytesPerChunk;
+ }
+}
+
+int yaffs_GetObjectLinkCount(yaffs_Object *obj)
+{
+ int count = 0;
+ struct list_head *i;
+
+ if(!obj->unlinked)
+ {
+ count++; // the object itself
+ }
+ list_for_each(i,&obj->hardLinks)
+ {
+ count++; // add the hard links;
+ }
+ return count;
+
+}
+
+
+int yaffs_GetObjectInode(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+
+ return obj->objectId;
+}
+
+unsigned yaffs_GetObjectType(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break;
+ case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break;
+ case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ if(S_ISFIFO(obj->yst_mode)) return DT_FIFO;
+ if(S_ISCHR(obj->yst_mode)) return DT_CHR;
+ if(S_ISBLK(obj->yst_mode)) return DT_BLK;
+ if(S_ISSOCK(obj->yst_mode)) return DT_SOCK;
+ default: return DT_REG; break;
+ }
+}
+
+YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+ if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+ {
+ return yaffs_CloneString(obj->variant.symLinkVariant.alias);
+ }
+ else
+ {
+ return yaffs_CloneString(_Y(""));
+ }
+}
+
+#ifndef CONFIG_YAFFS_WINCE
+
+int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
+{
+ unsigned int valid = attr->ia_valid;
+
+ if(valid & ATTR_MODE) obj->yst_mode = attr->ia_mode;
+ if(valid & ATTR_UID) obj->yst_uid = attr->ia_uid;
+ if(valid & ATTR_GID) obj->yst_gid = attr->ia_gid;
+
+ if(valid & ATTR_ATIME) obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+ if(valid & ATTR_CTIME) obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+ if(valid & ATTR_MTIME) obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+ if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
+
+ yaffs_UpdateObjectHeader(obj,NULL,1,0,0);
+
+ return YAFFS_OK;
+
+}
+int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
+{
+ unsigned int valid = 0;
+
+ attr->ia_mode = obj->yst_mode; valid |= ATTR_MODE;
+ attr->ia_uid = obj->yst_uid; valid |= ATTR_UID;
+ attr->ia_gid = obj->yst_gid; valid |= ATTR_GID;
+
+ Y_TIME_CONVERT(attr->ia_atime)= obj->yst_atime; valid |= ATTR_ATIME;
+ Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime; valid |= ATTR_CTIME;
+ Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime; valid |= ATTR_MTIME;
+
+ attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
+
+ attr->ia_valid = valid;
+
+ return YAFFS_OK;
+
+}
+
+#endif
+
+int yaffs_DumpObject(yaffs_Object *obj)
+{
+// __u8 buffer[YAFFS_BYTES_PER_CHUNK];
+ YCHAR name[257];
+// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
+
+// memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
+
+// if(obj->chunkId >= 0)
+// {
+// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
+// }
+
+ yaffs_GetObjectName(obj,name,256);
+
+ T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR),
+ obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
+ obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
+
+#if 0
+ YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
+ obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
+ obj->sum, obj->chunkId));
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ YPRINTF((" DIRECTORY\n"));
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK: //todo
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ }
+#endif
+
+ return YAFFS_OK;
+}
+
+
+///////////////////////// Initialisation code ///////////////////////////
+
+
+static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
+{
+
+ // Common functions, gotta have
+ if(!dev->eraseBlockInNAND ||
+ !dev->initialiseNAND) return 0;
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+ // Can use the "with tags" style interface for yaffs1 or yaffs2
+ if(dev->writeChunkWithTagsToNAND &&
+ dev->readChunkWithTagsFromNAND &&
+ !dev->writeChunkToNAND &&
+ !dev->readChunkFromNAND &&
+ dev->markNANDBlockBad &&
+ dev->queryNANDBlock) return 1;
+#endif
+
+ // Can use the "spare" style interface for yaffs1
+ if(!dev->isYaffs2 &&
+ !dev->writeChunkWithTagsToNAND &&
+ !dev->readChunkWithTagsFromNAND &&
+ dev->writeChunkToNAND &&
+ dev->readChunkFromNAND &&
+ !dev->markNANDBlockBad &&
+ !dev->queryNANDBlock) return 1;
+
+ return 0; // bad
+}
+
+
+int yaffs_GutsInitialise(yaffs_Device *dev)
+{
+ unsigned x;
+ int bits;
+ int extraBits;
+ int nBlocks;
+
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
+ // Check stuff that must be set
+
+ if(!dev)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Need a device" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ dev->internalStartBlock = dev->startBlock;
+ dev->internalEndBlock = dev->endBlock;
+ dev->blockOffset = 0;
+ dev->chunkOffset = 0;
+ dev->nFreeChunks = 0;
+
+ if(dev->startBlock == 0)
+ {
+ dev->internalStartBlock = dev->startBlock + 1;
+ dev->internalEndBlock = dev->endBlock + 1;
+ dev->blockOffset = 1;
+ dev->chunkOffset = dev->nChunksPerBlock;
+ }
+
+ // Check geometry parameters.
+
+ if( (dev->isYaffs2 && dev->nBytesPerChunk <1024) ||
+ (!dev->isYaffs2 && dev->nBytesPerChunk !=512) ||
+ dev->nChunksPerBlock < 2 ||
+ dev->nReservedBlocks < 2 ||
+ dev->internalStartBlock <= 0 ||
+ dev->internalEndBlock <= 0 ||
+ dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
+ )
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s " TENDSTR),
+ dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
+ return YAFFS_FAIL;
+ }
+
+ if(yaffs_InitialiseNAND(dev) != YAFFS_OK)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Got the right mix of functions?
+ //
+ if(!yaffs_CheckDevFunctions(dev))
+ {
+ //Function missing
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device function(s) missing or wrong\n" TENDSTR)));
+
+ return YAFFS_FAIL;
+ }
+
+ // This is really a compilation check.
+ if(!yaffs_CheckStructures())
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ if(dev->isMounted)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ //
+ //
+ // Finished with most checks. One or two more checks happen later on too.
+ //
+
+ dev->isMounted = 1;
+
+
+ nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+
+
+
+ // OK now calculate a few things for the device
+ // Calculate chunkGroupBits.
+ // We need to find the next power of 2 > than internalEndBlock
+
+ x = dev->nChunksPerBlock * (dev->internalEndBlock+1);
+
+ for(bits = extraBits = 0; x > 1; bits++)
+ {
+ if(x & 1) extraBits++;
+ x >>= 1;
+ }
+
+ if(extraBits > 0) bits++;
+
+
+ // Level0 Tnodes are 16 bits, so if the bitwidth of the
+ // chunk range we're using is greater than 16 we need
+ // to figure out chunk shift and chunkGroupSize
+ if(bits <= 16)
+ {
+ dev->chunkGroupBits = 0;
+ }
+ else
+ {
+ dev->chunkGroupBits = bits - 16;
+ }
+
+ dev->chunkGroupSize = 1 << dev->chunkGroupBits;
+
+ if(dev->nChunksPerBlock < dev->chunkGroupSize)
+ {
+ // We have a problem because the soft delete won't work if
+ // the chunk group size > chunks per block.
+ // This can be remedied by using larger "virtual blocks".
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: chunk group too large\n" TENDSTR)));
+
+ return YAFFS_FAIL;
+ }
+
+
+ // OK, we've finished verifying the device, lets continue with initialisation
+
+ // More device initialisation
+ dev->garbageCollections = 0;
+ dev->passiveGarbageCollections = 0;
+ dev->currentDirtyChecker = 0;
+ dev->bufferedBlock = -1;
+ dev->doingBufferedBlockRewrite = 0;
+ dev->nDeletedFiles = 0;
+ dev->nBackgroundDeletions=0;
+ dev->nUnlinkedFiles = 0;
+ dev->eccFixed=0;
+ dev->eccUnfixed=0;
+ dev->tagsEccFixed=0;
+ dev->tagsEccUnfixed=0;
+ dev->nErasureFailures = 0;
+ dev->nErasedBlocks = 0;
+ dev->isDoingGC = 0;
+
+ //dev->localBuffer = YMALLOC(dev->nBytesPerChunk);
+ // Initialise temporary buffers
+ {
+ int i;
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ dev->tempBuffer[i].line = 0; // not in use
+ dev->tempBuffer[i].buffer = YMALLOC(dev->nBytesPerChunk);
+ }
+ }
+
+
+
+ yaffs_InitialiseBlocks(dev,nBlocks);
+
+ yaffs_InitialiseTnodes(dev);
+
+ yaffs_InitialiseObjects(dev);
+
+ dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
+
+ if(dev->nShortOpCaches > 0)
+ {
+ int i;
+
+ if(dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
+ {
+ dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
+ }
+
+ dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
+
+ for(i=0; i < dev->nShortOpCaches; i++)
+ {
+ dev->srCache[i].object = NULL;
+ dev->srCache[i].lastUse = 0;
+ dev->srCache[i].dirty = 0;
+ dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
+ }
+ dev->srLastUse = 0;
+ }
+
+ dev->cacheHits = 0;
+
+
+ // Initialise the unlinked, root and lost and found directories
+ dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = dev->deletedDir = NULL;
+
+ dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+ dev->deletedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_DELETED, S_IFDIR);
+
+ dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
+ dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+ yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
+
+ if(dev->isYaffs2)
+ {
+ dev->useHeaderFileSize = 1;
+ }
+
+ // Now scan the flash.
+
+ if(dev->isYaffs2)
+ yaffs_ScanBackwards(dev);
+ else
+ yaffs_Scan(dev);
+
+ // Zero out stats
+ dev->nPageReads = 0;
+ dev->nPageWrites = 0;
+ dev->nBlockErasures = 0;
+ dev->nGCCopies = 0;
+ dev->nRetriedWrites = 0;
+
+ dev->nRetiredBlocks = 0;
+
+ yaffs_VerifyFreeChunks(dev);
+
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
+ return YAFFS_OK;
+
+}
+
+void yaffs_Deinitialise(yaffs_Device *dev)
+{
+ if(dev->isMounted)
+ {
+ int i;
+
+ yaffs_DeinitialiseBlocks(dev);
+ yaffs_DeinitialiseTnodes(dev);
+ yaffs_DeinitialiseObjects(dev);
+ if(dev->nShortOpCaches > 0)
+ {
+
+ for(i=0; i < dev->nShortOpCaches; i++)
+ {
+ YFREE(dev->srCache[i].data);
+ }
+
+ YFREE(dev->srCache);
+ }
+
+ YFREE(dev->gcCleanupList);
+
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ YFREE(dev->tempBuffer[i].buffer);
+ }
+
+ dev->isMounted = 0;
+ }
+
+}
+
+#if 0
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
+{
+ int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
+
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ // To the free chunks add the chunks that are in the deleted unlinked files.
+ list_for_each(i,&dev->deletedDir->variant.directoryVariant.children)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l->deleted)
+ {
+ nFree++;
+ nFree += l->nDataChunks;
+ }
+ }
+
+
+ // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
+
+ if(nFree < 0) nFree = 0;
+
+ return nFree;
+
+}
+
+#endif
+
+static int yaffs_CountFreeChunks(yaffs_Device *dev)
+{
+ int nFree;
+ int b;
+
+ yaffs_BlockInfo *blk;
+
+
+ for(nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock; b++)
+ {
+ blk = yaffs_GetBlockInfo(dev,b);
+
+ switch(blk->blockState)
+ {
+ case YAFFS_BLOCK_STATE_EMPTY:
+ case YAFFS_BLOCK_STATE_ALLOCATING:
+ case YAFFS_BLOCK_STATE_COLLECTING:
+ case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse + blk->softDeletions); break;
+ default: break;
+ }
+
+ }
+
+ return nFree;
+}
+
+
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
+{
+ // This is what we report to the outside world
+
+ int nFree;
+ int nDirtyCacheChunks;
+
+#if 1
+ nFree = dev->nFreeChunks;
+#else
+ nFree = yaffs_CountFreeChunks(dev);
+#endif
+
+ // Now count the number of dirty chunks in the cache and subtract those
+
+ {
+ int i;
+ for( nDirtyCacheChunks = 0,i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if(dev->srCache[i].dirty) nDirtyCacheChunks++;
+ }
+ }
+
+ nFree -= nDirtyCacheChunks;
+
+ nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
+
+ if(nFree < 0) nFree = 0;
+
+ return nFree;
+
+}
+
+static int yaffs_freeVerificationFailures;
+
+static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
+{
+ int counted = yaffs_CountFreeChunks(dev);
+
+ int difference = dev->nFreeChunks - counted;
+
+ if(difference)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("Freechunks verification failure %d %d %d" TENDSTR),dev->nFreeChunks,counted,difference));
+ yaffs_freeVerificationFailures++;
+ }
+}
+
+/////////////////// YAFFS test code //////////////////////////////////
+
+#define yaffs_CheckStruct(structure,syze, name) \
+ if(sizeof(structure) != syze) \
+ { \
+ T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
+ return YAFFS_FAIL; \
+ }
+
+
+static int yaffs_CheckStructures(void)
+{
+// yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
+// yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
+// yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
+#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
+ yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
+#endif
+ yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
+
+
+ return YAFFS_OK;
+}
+
+#if 0
+void yaffs_GutsTest(yaffs_Device *dev)
+{
+
+ if(yaffs_CheckStructures() != YAFFS_OK)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
+ return;
+ }
+
+ yaffs_TnodeTest(dev);
+ yaffs_ObjectTest(dev);
+}
+#endif
+
+
diff --git a/fs/yaffs/yaffs_guts.h b/fs/yaffs/yaffs_guts.h
new file mode 100644
index 0000000..58c52e0
--- /dev/null
+++ b/fs/yaffs/yaffs_guts.h
@@ -0,0 +1,759 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_guts.h: Configuration etc for yaffs_guts
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * $Id: yaffs_guts.h,v 1.11 2005/07/31 06:52:40 charles Exp $
+ */
+
+#ifndef __YAFFS_GUTS_H__
+#define __YAFFS_GUTS_H__
+
+#include "devextras.h"
+#include "yportenv.h"
+
+#define YAFFS_OK 1
+#define YAFFS_FAIL 0
+
+// Give us a Y=0x59,
+// Give us an A=0x41,
+// Give us an FF=0xFF
+// Give us an S=0x53
+// And what have we got...
+#define YAFFS_MAGIC 0x5941FF53
+
+#define YAFFS_NTNODES_LEVEL0 16
+#define YAFFS_TNODES_LEVEL0_BITS 4
+#define YAFFS_TNODES_LEVEL0_MASK 0xf
+
+#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2)
+#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1)
+#define YAFFS_TNODES_INTERNAL_MASK 0x7
+#define YAFFS_TNODES_MAX_LEVEL 6
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+#define YAFFS_BYTES_PER_SPARE 16
+#define YAFFS_BYTES_PER_CHUNK 512
+#define YAFFS_CHUNK_SIZE_SHIFT 9
+#define YAFFS_CHUNKS_PER_BLOCK 32
+#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
+#endif
+
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
+#define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
+
+#define YAFFS_MAX_CHUNK_ID 0x000FFFFF
+
+#define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF
+
+#define YAFFS_ALLOCATION_NOBJECTS 100
+#define YAFFS_ALLOCATION_NTNODES 100
+#define YAFFS_ALLOCATION_NLINKS 100
+
+#define YAFFS_NOBJECT_BUCKETS 256
+
+
+#define YAFFS_OBJECT_SPACE 0x40000
+
+#ifdef CONFIG_YAFFS_UNICODE
+#define YAFFS_MAX_NAME_LENGTH 127
+#define YAFFS_MAX_ALIAS_LENGTH 79
+#else
+#define YAFFS_MAX_NAME_LENGTH 255
+#define YAFFS_MAX_ALIAS_LENGTH 159
+#endif
+
+#define YAFFS_SHORT_NAME_LENGTH 15
+
+
+#define YAFFS_OBJECTID_ROOT 1
+#define YAFFS_OBJECTID_LOSTNFOUND 2
+#define YAFFS_OBJECTID_UNLINKED 3
+#define YAFFS_OBJECTID_DELETED 4
+
+#define YAFFS_MAX_SHORT_OP_CACHES 20
+
+#define YAFFS_N_TEMP_BUFFERS 4
+
+// Sequence numbers are used in YAFFS2 to determine block allocation order.
+// The range is limited slightly to help distinguish bad numbers from good.
+// This also allows us to perhaps in the future use special numbers for
+// special purposes.
+// EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
+// and is a larger number than the lifetime of a 2GB device.
+
+#define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000
+#define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00
+
+
+// ChunkCache is used for short read/write operations.
+typedef struct
+{
+ struct yaffs_ObjectStruct *object;
+ int chunkId;
+ int lastUse;
+ int dirty;
+ int nBytes; // Only valid if the cache is dirty
+ int locked; // Can't push out or flush while locked..
+#ifdef CONFIG_YAFFS_YAFFS2
+ __u8 *data;
+#else
+ __u8 data[YAFFS_BYTES_PER_CHUNK];
+#endif
+} yaffs_ChunkCache;
+
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+// Tags structures in RAM
+// NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
+// the structure size will get blown out.
+
+typedef struct
+{
+ unsigned chunkId:20;
+ unsigned serialNumber:2;
+ unsigned byteCount:10;
+ unsigned objectId:18;
+ unsigned ecc:12;
+ unsigned unusedStuff:2;
+
+} yaffs_Tags;
+
+typedef union
+{
+ yaffs_Tags asTags;
+ __u8 asBytes[8];
+} yaffs_TagsUnion;
+
+#endif
+
+typedef enum
+{
+ YAFFS_ECC_RESULT_UNKNOWN,
+ YAFFS_ECC_RESULT_NO_ERROR,
+ YAFFS_ECC_RESULT_FIXED,
+ YAFFS_ECC_RESULT_UNFIXED
+} yaffs_ECCResult;
+
+typedef enum
+{
+ YAFFS_OBJECT_TYPE_UNKNOWN,
+ YAFFS_OBJECT_TYPE_FILE,
+ YAFFS_OBJECT_TYPE_SYMLINK,
+ YAFFS_OBJECT_TYPE_DIRECTORY,
+ YAFFS_OBJECT_TYPE_HARDLINK,
+ YAFFS_OBJECT_TYPE_SPECIAL
+} yaffs_ObjectType;
+
+
+typedef struct
+{
+
+ unsigned validMarker0;
+ unsigned chunkUsed; // Status of the chunk: used or unused
+ unsigned objectId; // If 0 then this is not part of an object (unused)
+ unsigned chunkId; // If 0 then this is a header, else a data chunk
+ unsigned byteCount; // Only valid for data chunks
+
+
+ // The following stuff only has meaning when we read
+ yaffs_ECCResult eccResult; // Only valid when we read.
+ unsigned blockBad; // Only valid on reading
+
+ // YAFFS 1 stuff
+ unsigned chunkDeleted; // The chunk is marked deleted
+ unsigned serialNumber; // Yaffs1 2-bit serial number
+
+ // YAFFS2 stuff
+ unsigned sequenceNumber; // The sequence number of this block
+
+ // Extra info if this is an object header (YAFFS2 only)
+
+ unsigned extraHeaderInfoAvailable; // There is extra info available if this is not zero
+ unsigned extraParentObjectId; // The parent object
+ unsigned extraIsShrinkHeader; // Is it a shrink header?
+ unsigned extraShadows; // Does this shadow another object?
+
+ yaffs_ObjectType extraObjectType; // What object type?
+
+ unsigned extraFileLength; // Length if it is a file
+ unsigned extraEquivalentObjectId; // Equivalent object Id if it is a hard link
+
+ unsigned validMarker1;
+
+} yaffs_ExtendedTags;
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+// Spare structure
+typedef struct
+{
+ __u8 tagByte0;
+ __u8 tagByte1;
+ __u8 tagByte2;
+ __u8 tagByte3;
+ __u8 pageStatus; // set to 0 to delete the chunk
+ __u8 blockStatus;
+ __u8 tagByte4;
+ __u8 tagByte5;
+ __u8 ecc1[3];
+ __u8 tagByte6;
+ __u8 tagByte7;
+ __u8 ecc2[3];
+} yaffs_Spare;
+
+//Special structure for passing through to mtd
+struct yaffs_NANDSpare {
+ yaffs_Spare spare;
+ int eccres1;
+ int eccres2;
+};
+#endif
+
+
+// Block data in RAM
+
+typedef enum {
+ YAFFS_BLOCK_STATE_UNKNOWN = 0,
+
+ YAFFS_BLOCK_STATE_SCANNING,
+ YAFFS_BLOCK_STATE_NEEDS_SCANNING,// The block might have something on it (ie it is allocating or full, perhaps empty)
+ // but it needs to be scanned to determine its true state.
+ // This state is only valid during yaffs_Scan.
+ // NB We tolerate empty because the pre-scanner might be incapable of deciding
+ // However, if this state is returned on a YAFFS2 device, then we expect a sequence number
+
+ YAFFS_BLOCK_STATE_EMPTY, // This block is empty
+
+ YAFFS_BLOCK_STATE_ALLOCATING, // This block is partially allocated.
+ // This is the one currently being used for page
+ // allocation. Should never be more than one of these
+
+
+ YAFFS_BLOCK_STATE_FULL, // All the pages in this block have been allocated.
+ // At least one page holds valid data.
+
+ YAFFS_BLOCK_STATE_DIRTY, // All pages have been allocated and deleted.
+ // Erase me, reuse me.
+
+ YAFFS_BLOCK_STATE_COLLECTING, // This block is being garbage collected
+
+ YAFFS_BLOCK_STATE_DEAD // This block has failed and is not in use
+
+} yaffs_BlockState;
+
+
+
+
+typedef struct
+{
+
+ int softDeletions:12; // number of soft deleted pages
+ int pagesInUse:12; // number of pages in use
+ yaffs_BlockState blockState:4; // One of the above block states
+ __u32 needsRetiring:1; // Data has failed on this block, need to get valid data off
+ // and retire the block.
+#ifdef CONFIG_YAFFS_YAFFS2
+ __u32 hasShrinkHeader:1;// This block has at least one object header that does a shrink
+ __u32 sequenceNumber; // block sequence number for yaffs2
+#endif
+
+} yaffs_BlockInfo;
+
+
+//////////////////// Object structure ///////////////////////////
+// This is the object structure as stored on NAND
+
+typedef struct
+{
+ yaffs_ObjectType type;
+
+ // Apply to everything
+ int parentObjectId;
+ __u16 sum__NoLongerUsed; // checksum of name. Calc this off the name to prevent inconsistencies
+ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ // Thes following apply to directories, files, symlinks - not hard links
+ __u32 yst_mode; // protection
+
+#ifdef CONFIG_YAFFS_WINCE
+ __u32 notForWinCE[5];
+#else
+ __u32 yst_uid; // user ID of owner
+ __u32 yst_gid; // group ID of owner
+ __u32 yst_atime; // time of last access
+ __u32 yst_mtime; // time of last modification
+ __u32 yst_ctime; // time of last change
+#endif
+
+ // File size applies to files only
+ int fileSize;
+
+ // Equivalent object id applies to hard links only.
+ int equivalentObjectId;
+
+ // Alias is for symlinks only.
+ YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
+
+ __u32 yst_rdev; // device stuff for block and char devices (maj/min)
+
+#ifdef CONFIG_YAFFS_WINCE
+ __u32 win_ctime[2];
+ __u32 win_atime[2];
+ __u32 win_mtime[2];
+ __u32 roomToGrow[4];
+#else
+ __u32 roomToGrow[10];
+#endif
+
+ int shadowsObject; // This object header shadows the specified object if not > 0
+
+ // isShrink applies to object headers written when we shrink the file (ie resize)
+ __u32 isShrink;
+
+} yaffs_ObjectHeader;
+
+
+
+//////////////////// Tnode ///////////////////////////
+
+union yaffs_Tnode_union
+{
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+ union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL+1];
+#else
+ union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
+#endif
+ __u16 level0[YAFFS_NTNODES_LEVEL0];
+
+};
+
+typedef union yaffs_Tnode_union yaffs_Tnode;
+
+struct yaffs_TnodeList_struct
+{
+ struct yaffs_TnodeList_struct *next;
+ yaffs_Tnode *tnodes;
+};
+
+typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
+
+
+
+/////////////////// Object ////////////////////////////////
+// An object can be one of:
+// - a directory (no data, has children links
+// - a regular file (data.... not prunes :->).
+// - a symlink [symbolic link] (the alias).
+// - a hard link
+
+
+typedef struct
+{
+ __u32 fileSize;
+ __u32 scannedFileSize;
+ __u32 shrinkSize;
+ int topLevel;
+ yaffs_Tnode *top;
+} yaffs_FileStructure;
+
+typedef struct
+{
+ struct list_head children; // list of child links
+} yaffs_DirectoryStructure;
+
+typedef struct
+{
+ YCHAR *alias;
+} yaffs_SymLinkStructure;
+
+typedef struct
+{
+ struct yaffs_ObjectStruct *equivalentObject;
+ __u32 equivalentObjectId;
+} yaffs_HardLinkStructure;
+
+typedef union
+{
+ yaffs_FileStructure fileVariant;
+ yaffs_DirectoryStructure directoryVariant;
+ yaffs_SymLinkStructure symLinkVariant;
+ yaffs_HardLinkStructure hardLinkVariant;
+} yaffs_ObjectVariant;
+
+
+struct yaffs_ObjectStruct
+{
+ __u8 deleted: 1; // This should only apply to unlinked files.
+ __u8 softDeleted: 1; // it has also been soft deleted
+ __u8 unlinked: 1; // An unlinked file. The file should be in the unlinked pseudo directory.
+ __u8 fake:1; // A fake object has no presence on NAND.
+ __u8 renameAllowed:1; // Some objects are not allowed to be renamed.
+ __u8 unlinkAllowed:1;
+ __u8 dirty:1; // the object needs to be written to flash
+ __u8 valid:1; // When the file system is being loaded up, this
+ // object might be created before the data
+ // is available (ie. file data records appear before the header).
+ __u8 serial; // serial number of chunk in NAND. Store here so we don't have to
+
+ __u8 deferedFree: 1; // For Linux kernel. Object is removed from NAND, but still in the inode cache.
+ // Free of object is defered.
+
+ __u8 lazyLoaded; // Vital info has been loaded from tags. Not all info available.
+ //
+
+ // read back the old one to update.
+ __u16 sum; // sum of the name to speed searching
+
+ struct yaffs_DeviceStruct *myDev; // The device I'm on
+
+
+ struct list_head hashLink; // list of objects in this hash bucket
+
+
+ struct list_head hardLinks; // all the equivalent hard linked objects
+ // live on this list
+ // directory structure stuff
+ struct yaffs_ObjectStruct *parent; //my parent directory
+ struct list_head siblings; // siblings in a directory
+ // also used for linking up the free list
+
+ // Where's my object header in NAND?
+ int chunkId; // where it lives
+
+ int nDataChunks; // Number of data chunks attached to the file.
+
+ __u32 objectId; // the object id value
+
+
+ __u32 yst_mode; // protection
+
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+ YCHAR shortName[YAFFS_SHORT_NAME_LENGTH+1];
+#endif
+
+#ifndef __KERNEL__
+ __u32 inUse;
+#endif
+
+#ifdef CONFIG_YAFFS_WINCE
+ __u32 win_ctime[2];
+ __u32 win_mtime[2];
+ __u32 win_atime[2];
+#else
+ __u32 yst_uid; // user ID of owner
+ __u32 yst_gid; // group ID of owner
+ __u32 yst_atime; // time of last access
+ __u32 yst_mtime; // time of last modification
+ __u32 yst_ctime; // time of last change
+#endif
+
+ __u32 yst_rdev; // device stuff for block and char devices
+
+
+
+#ifdef __KERNEL__
+ struct inode *myInode;
+
+#endif
+
+
+
+ yaffs_ObjectType variantType;
+
+ yaffs_ObjectVariant variant;
+
+};
+
+
+
+typedef struct yaffs_ObjectStruct yaffs_Object;
+
+
+struct yaffs_ObjectList_struct
+{
+ yaffs_Object *objects;
+ struct yaffs_ObjectList_struct *next;
+};
+
+typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
+
+typedef struct
+{
+ struct list_head list;
+ int count;
+} yaffs_ObjectBucket;
+
+///////////////////// Temporary buffers ////////////////////
+//
+// These are chunk-sized working buffers. Each device has a few
+
+typedef struct {
+ __u8 *buffer;
+ int line; // track from whence this buffer was allocated
+ int maxLine;
+} yaffs_TempBuffer;
+
+//////////////////// Device ////////////////////////////////
+
+struct yaffs_DeviceStruct
+{
+ struct list_head devList;
+ const char *name;
+
+ // Entry parameters set up way early. Yaffs sets up the rest.
+ int nBytesPerChunk; // Should be a power of 2 >= 512
+ int nChunksPerBlock; // does not need to be a power of 2
+ int nBytesPerSpare; // spare area size
+ int startBlock; // Start block we're allowed to use
+ int endBlock; // End block we're allowed to use
+ int nReservedBlocks; // We want this tuneable so that we can reduce
+ // reserved blocks on NOR and RAM.
+
+ int nShortOpCaches; // If <= 0, then short op caching is disabled, else
+ // the number of short op caches (don't use too many).
+
+ int useHeaderFileSize; // Flag to determine if we should use file sizes from the header
+
+ int useNANDECC; // Flag to decide whether or not to use NANDECC
+
+
+ void *genericDevice; // Pointer to device context
+ // On an mtd this holds the mtd pointer.
+
+ // NAND access functions (Must be set before calling YAFFS)
+
+
+ int (*writeChunkToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, const yaffs_Spare *spare);
+ int (*readChunkFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
+ int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev,int blockInNAND);
+ int (*initialiseNAND)(struct yaffs_DeviceStruct *dev);
+
+#ifdef CONFIG_YAFFS_YAFFS2
+ int (*writeChunkWithTagsToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, const yaffs_ExtendedTags *tags);
+ int (*readChunkWithTagsFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+ int (*markNANDBlockBad)(struct yaffs_DeviceStruct *dev, int blockNo);
+ int (*queryNANDBlock)(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+#endif
+
+ int isYaffs2;
+
+ // End of stuff that must be set before initialisation.
+
+ // Runtime parameters. Set up by YAFFS.
+
+ __u16 chunkGroupBits; // 0 for devices <= 32MB. else log2(nchunks) - 16
+ __u16 chunkGroupSize; // == 2^^chunkGroupBits
+
+#ifdef __KERNEL__
+
+ struct semaphore sem;// Semaphore for waiting on erasure.
+ struct semaphore grossLock; // Gross locking semaphore
+ __u8 * spareBuffer; // For mtdif2 use. Don't know the size of the buffer at compile time so we have to allocate it.
+ void (*putSuperFunc)(struct super_block *sb);
+#endif
+
+ int isMounted;
+
+ // Stuff to support block offsetting to support start block zero
+ int internalStartBlock;
+ int internalEndBlock;
+ int blockOffset;
+ int chunkOffset;
+
+ // Block Info
+ yaffs_BlockInfo *blockInfo;
+ __u8 *chunkBits; // bitmap of chunks in use
+ int chunkBitmapStride; // Number of bytes of chunkBits per block.
+ // Must be consistent with nChunksPerBlock.
+
+
+ int nErasedBlocks;
+ int allocationBlock; // Current block being allocated off
+ __u32 allocationPage;
+ int allocationBlockFinder; // Used to search for next allocation block
+
+ // Runtime state
+ int nTnodesCreated;
+ yaffs_Tnode *freeTnodes;
+ int nFreeTnodes;
+ yaffs_TnodeList *allocatedTnodeList;
+
+ int isDoingGC;
+
+ int nObjectsCreated;
+ yaffs_Object *freeObjects;
+ int nFreeObjects;
+
+ yaffs_ObjectList *allocatedObjectList;
+
+ yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
+
+ int nFreeChunks;
+
+ int currentDirtyChecker; // Used to find current dirtiest block
+
+ __u32 *gcCleanupList; // objects to delete at the end of a GC.
+
+ // Operations since mount
+ int nPageWrites;
+ int nPageReads;
+ int nBlockErasures;
+ int nErasureFailures;
+ int nGCCopies;
+ int garbageCollections;
+ int passiveGarbageCollections;
+ int nRetriedWrites;
+ int nRetiredBlocks;
+ int eccFixed;
+ int eccUnfixed;
+ int tagsEccFixed;
+ int tagsEccUnfixed;
+ int nDeletions;
+ int nUnmarkedDeletions;
+
+ yaffs_Object *rootDir;
+ yaffs_Object *lostNFoundDir;
+
+ // Buffer areas for storing data to recover from write failures
+// __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
+// yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];
+ int bufferedBlock; // Which block is buffered here?
+ int doingBufferedBlockRewrite;
+
+ yaffs_ChunkCache *srCache;
+ int srLastUse;
+
+ int cacheHits;
+
+ // Stuff for background deletion and unlinked files.
+ yaffs_Object *unlinkedDir; // Directory where unlinked and deleted files live.
+ yaffs_Object *deletedDir; // Directory where deleted objects are sent to disappear.
+ yaffs_Object *unlinkedDeletion; // Current file being background deleted.
+ int nDeletedFiles; // Count of files awaiting deletion;
+ int nUnlinkedFiles; // Count of unlinked files.
+ int nBackgroundDeletions; // Count of background deletions.
+
+ //__u8 *localBuffer;
+
+ yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
+ int maxTemp;
+ int unmanagedTempAllocations;
+ int unmanagedTempDeallocations;
+
+ // yaffs2 runtime stuff
+ unsigned sequenceNumber; //Sequence number of currently allocating block
+ unsigned oldestDirtySequence;
+
+};
+
+typedef struct yaffs_DeviceStruct yaffs_Device;
+
+
+// Function to manipulate block info
+static Y_INLINE yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)
+{
+ if(blk < dev->internalStartBlock || blk > dev->internalEndBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),blk));
+ YBUG();
+ }
+ return &dev->blockInfo[blk - dev->internalStartBlock];
+}
+
+
+//////////// YAFFS Functions //////////////////
+
+int yaffs_GutsInitialise(yaffs_Device *dev);
+void yaffs_Deinitialise(yaffs_Device *dev);
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev);
+
+
+// Rename
+int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, yaffs_Object *newDir, const YCHAR *newName);
+
+// generic Object functions
+int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name);
+int yaffs_DeleteFile(yaffs_Object *obj);
+
+// Object access functions.
+int yaffs_GetObjectName(yaffs_Object *obj,YCHAR *name,int buffSize);
+int yaffs_GetObjectFileLength(yaffs_Object *obj);
+int yaffs_GetObjectInode(yaffs_Object *obj);
+unsigned yaffs_GetObjectType(yaffs_Object *obj);
+int yaffs_GetObjectLinkCount(yaffs_Object *obj);
+
+// Change inode attributes
+int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr);
+int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr);
+
+// File operations
+int yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, __u32 offset, int nBytes);
+int yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, __u32 offset, int nBytes, int writeThrough);
+int yaffs_ResizeFile(yaffs_Object *obj, int newSize);
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid);
+int yaffs_FlushFile(yaffs_Object *obj,int updateTime);
+
+
+// Directory operations
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid);
+yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir,const YCHAR *name);
+int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *));
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number);
+
+// Link operations
+yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, yaffs_Object *equivalentObject);
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj);
+
+// Symlink operations
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name, __u32 mode, __u32 uid, __u32 gid, const YCHAR *alias);
+YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj);
+
+// Special inodes (fifos, sockets and devices)
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid,__u32 rdev);
+
+
+// Special directories
+yaffs_Object *yaffs_Root(yaffs_Device *dev);
+yaffs_Object *yaffs_LostNFound(yaffs_Device *dev);
+
+#ifdef CONFIG_YAFFS_WINCE
+// CONFIG_YAFFS_WINCE special stuff
+void yfsd_WinFileTimeNow(__u32 target[2]);
+#endif
+
+#ifdef __KERNEL__
+
+void yaffs_HandleDeferedFree(yaffs_Object *obj);
+#endif
+
+
+
+
+// Debug dump
+int yaffs_DumpObject(yaffs_Object *obj);
+
+
+void yaffs_GutsTest(yaffs_Device *dev);
+
+
+void yaffs_InitialiseTags(yaffs_ExtendedTags *tags);
+void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND,int lyn);
+int yaffs_CheckFF(__u8 *buffer,int nBytes);
+
+#endif
+
diff --git a/fs/yaffs/yaffs_mtdif.c b/fs/yaffs/yaffs_mtdif.c
new file mode 100644
index 0000000..90146fb
--- /dev/null
+++ b/fs/yaffs/yaffs_mtdif.c
@@ -0,0 +1,153 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_mtdif.c NAND mtd wrapper functions.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.7 2005/08/01 20:52:35 luc Exp $";
+
+#include "yportenv.h"
+
+#ifdef CONFIG_YAFFS_YAFFS1
+
+#include "yaffs_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+#include "linux/mtd/nand.h"
+
+static struct nand_oobinfo yaffs_oobinfo = {
+ .useecc = 1,
+ .eccbytes = 6,
+ .eccpos = {8, 9, 10, 13, 14, 15}
+};
+
+static struct nand_oobinfo yaffs_noeccinfo = {
+ .useecc = 0,
+};
+
+
+int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
+{
+ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+ size_t dummy;
+ int retval = 0;
+
+ loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+
+ __u8 *spareAsBytes = (__u8 *)spare;
+
+ if(data && spare)
+ {
+ if(dev->useNANDECC)
+ retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
+ else
+ retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
+ }
+ else
+ {
+ if(data)
+ retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+ if(spare)
+ retval = mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
+ }
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+}
+
+int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
+{
+ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+ size_t dummy;
+ int retval = 0;
+
+ loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+
+ __u8 *spareAsBytes = (__u8 *)spare;
+
+ if(data && spare)
+ {
+ if(dev->useNANDECC)
+ { // Careful, this call adds 2 ints to the end of the spare data. Calling function should
+ // allocate enough memory for spare, i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)].
+ retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_oobinfo);
+ }
+ else
+ {
+ retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,spareAsBytes,&yaffs_noeccinfo);
+ }
+ }
+ else
+ {
+ if(data)
+ retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+ if(spare)
+ retval = mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
+ }
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+}
+
+// Callback not needed for NAND
+#if 0
+static void nandmtd_EraseCallback(struct erase_info *ei)
+{
+ yaffs_Device *dev = (yaffs_Device *)ei->priv;
+ up(&dev->sem);
+}
+#endif
+
+
+int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+ __u32 addr = ((loff_t) blockNumber) * dev->nBytesPerChunk * dev->nChunksPerBlock;
+ struct erase_info ei;
+ int retval = 0;
+
+ ei.mtd = mtd;
+ ei.addr = addr;
+ ei.len = dev->nBytesPerChunk * dev->nChunksPerBlock;
+ ei.time = 1000;
+ ei.retries = 2;
+ ei.callback = NULL;
+ ei.priv = (u_long)dev;
+
+ // Todo finish off the ei if required
+
+ sema_init(&dev->sem,0);
+
+ retval = mtd->erase(mtd,&ei);
+
+ //No need for callback
+ // down(&dev->sem); // Wait for the erasure to complete
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+}
+
+int nandmtd_InitialiseNAND(yaffs_Device *dev)
+{
+ return YAFFS_OK;
+}
+
+#endif // CONFIG_YAFFS_YAFFS1
+
diff --git a/fs/yaffs/yaffs_mtdif.h b/fs/yaffs/yaffs_mtdif.h
new file mode 100644
index 0000000..8846828
--- /dev/null
+++ b/fs/yaffs/yaffs_mtdif.h
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_mtdif.h NAND mtd interface wrappers
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * $Id: yaffs_mtdif.h,v 1.2 2005/07/19 20:41:59 charles Exp $
+ */
+
+#ifndef __YAFFS_MTDIF_H__
+#define __YAFFS_MTDIF_H__
+
+#include "yaffs_guts.h"
+
+int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);
+int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
+int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
+int nandmtd_InitialiseNAND(yaffs_Device *dev);
+#endif
+
+
+
+
diff --git a/fs/yaffs/yaffs_mtdif2.c b/fs/yaffs/yaffs_mtdif2.c
new file mode 100644
index 0000000..0c4cc39
--- /dev/null
+++ b/fs/yaffs/yaffs_mtdif2.c
@@ -0,0 +1,177 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_mtdif.c NAND mtd wrapper functions.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+// mtd interface for YAFFS2
+
+const char *yaffs_mtdif2_c_version = "$Id: yaffs_mtdif2.c,v 1.6 2005/08/01 20:52:35 luc Exp $";
+
+#include "yportenv.h"
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+#include "yaffs_mtdif2.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#include "yaffs_packedtags2.h"
+
+
+
+
+int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
+{
+ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+ size_t dummy;
+ int retval = 0;
+
+
+ loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+
+ yaffs_PackedTags2 pt;
+
+ T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p" TENDSTR),chunkInNAND,data,tags));
+
+ if(tags)
+ {
+ yaffs_PackTags2(&pt,tags);
+ }
+
+ if(data && tags)
+ {
+ if(dev->useNANDECC)
+ retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
+ else
+ retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
+ }
+ else
+ {
+ if(data)
+ retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+ if(tags)
+ retval = mtd->write_oob(mtd,addr,mtd->oobsize,&dummy,(__u8 *)&pt);
+
+ }
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+}
+
+int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
+{
+ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+ size_t dummy;
+ int retval = 0;
+
+
+ loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
+
+ yaffs_PackedTags2 pt;
+
+ T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_ReadChunkWithTagsToNAND chunk %d data %p tags %p" TENDSTR),chunkInNAND,data,tags));
+
+ if(data && tags)
+ {
+ if(dev->useNANDECC)
+ {
+ retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);
+ }
+ else
+ {
+ retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);
+ }
+ memcpy(&pt,dev->spareBuffer,sizeof(pt));
+ }
+ else
+ {
+ if(data)
+ retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
+ if(tags) {
+ retval = mtd->read_oob(mtd,addr,mtd->oobsize,&dummy,dev->spareBuffer);
+ memcpy(&pt, mtd->oobinfo.oobfree[0][0] + (char *)dev->spareBuffer, sizeof(pt));
+ }
+ }
+
+ if(tags)
+ yaffs_UnpackTags2(tags,&pt);
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+}
+
+int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+{
+ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+ int retval;
+ T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR),blockNo));
+
+
+ retval = mtd->block_markbad(mtd,blockNo * dev->nChunksPerBlock * dev->nBytesPerChunk);
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+
+}
+
+int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
+{
+ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+ int retval;
+
+ T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR),blockNo));
+ retval = mtd->block_isbad(mtd,blockNo* dev->nChunksPerBlock * dev->nBytesPerChunk);
+
+ if(retval)
+ {
+ T(YAFFS_TRACE_MTD,(TSTR("block is bad" TENDSTR)));
+
+ *state = YAFFS_BLOCK_STATE_DEAD;
+ *sequenceNumber = 0;
+ }
+ else
+ {
+ yaffs_ExtendedTags t;
+ nandmtd2_ReadChunkWithTagsFromNAND(dev,blockNo * dev->nChunksPerBlock,NULL, &t);
+
+ if(t.chunkUsed)
+ {
+ *sequenceNumber = t.sequenceNumber;
+ *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+ }
+ else
+ {
+ *sequenceNumber = 0;
+ *state = YAFFS_BLOCK_STATE_EMPTY;
+ }
+ }
+ T(YAFFS_TRACE_MTD,(TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,*state));
+
+ if (retval == 0)
+ return YAFFS_OK;
+ else
+ return YAFFS_FAIL;
+}
+
+#endif
+
+
+
diff --git a/fs/yaffs/yaffs_mtdif2.h b/fs/yaffs/yaffs_mtdif2.h
new file mode 100644
index 0000000..5b308ee
--- /dev/null
+++ b/fs/yaffs/yaffs_mtdif2.h
@@ -0,0 +1,27 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_mtdif.c NAND mtd wrapper functions.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+
+#ifndef __YAFFS_MTDIF2_H__
+#define __YAFFS_MTDIF2_H__
+
+
+#include "yaffs_guts.h"
+int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags);
+int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+
+#endif
diff --git a/fs/yaffs/yaffs_nandemul2k.h b/fs/yaffs/yaffs_nandemul2k.h
new file mode 100644
index 0000000..b35d474
--- /dev/null
+++ b/fs/yaffs/yaffs_nandemul2k.h
@@ -0,0 +1,38 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * yaffs_nandemul2k.h: Interface to emulated NAND functions (2k page size)
+ *
+ * $Id: yaffs_nandemul2k.h,v 1.1 2004/12/17 04:39:04 charles Exp $
+ */
+
+#ifndef __YAFFS_NANDEMUL2K_H__
+#define __YAFFS_NANDEMUL2K_H__
+
+#include "yaffs_guts.h"
+
+
+int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
+int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+int nandemul2k_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND);
+int nandemul2k_InitialiseNAND(struct yaffs_DeviceStruct *dev);
+int nandemul2k_GetBytesPerChunk(void);
+int nandemul2k_GetChunksPerBlock(void);
+int nandemul2k_GetNumberOfBlocks(void);
+
+#endif
+
diff --git a/fs/yaffs/yaffs_packedtags1.c b/fs/yaffs/yaffs_packedtags1.c
new file mode 100644
index 0000000..bab338f
--- /dev/null
+++ b/fs/yaffs/yaffs_packedtags1.c
@@ -0,0 +1,42 @@
+#include "yaffs_packedtags1.h"
+#include "yportenv.h"
+
+void yaffs_PackTags1(yaffs_PackedTags1 *pt, const yaffs_ExtendedTags *t)
+{
+ pt->chunkId = t->chunkId;
+ pt->serialNumber = t->serialNumber;
+ pt->byteCount = t->byteCount;
+ pt->objectId = t->objectId;
+ pt->ecc = 0;
+ pt->deleted = (t->chunkDeleted) ? 0 : 1;
+ pt->unusedStuff = 0;
+ pt->shouldBeFF = 0xFFFFFFFF;
+
+}
+
+void yaffs_UnpackTags1(yaffs_ExtendedTags *t, const yaffs_PackedTags1 *pt)
+{
+ static const __u8 allFF[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff};
+
+ if(memcmp(allFF,pt,sizeof(yaffs_PackedTags1)))
+ {
+ t->blockBad = 0;
+ if(pt->shouldBeFF != 0xFFFFFFFF)
+ {
+ t->blockBad = 1;
+ }
+ t->chunkUsed = 1;
+ t->objectId = pt->objectId;
+ t->chunkId = pt->chunkId;
+ t->byteCount = pt->byteCount;
+ t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+ t->chunkDeleted = (pt->deleted) ? 0 : 1;
+ t->serialNumber = pt->serialNumber;
+ }
+ else
+ {
+ memset(t,0,sizeof(yaffs_ExtendedTags));
+
+ }
+}
+
diff --git a/fs/yaffs/yaffs_packedtags1.h b/fs/yaffs/yaffs_packedtags1.h
new file mode 100644
index 0000000..0f76615
--- /dev/null
+++ b/fs/yaffs/yaffs_packedtags1.h
@@ -0,0 +1,28 @@
+// This is used to pack YAFFS1 tags, not YAFFS2 tags.
+
+#ifndef __YAFFS_PACKEDTAGS1_H__
+#define __YAFFS_PACKEDTAGS1_H__
+
+
+#include "yaffs_guts.h"
+
+typedef struct
+{
+ unsigned chunkId:20;
+ unsigned serialNumber:2;
+ unsigned byteCount:10;
+ unsigned objectId:18;
+ unsigned ecc:12;
+ unsigned deleted:1;
+ unsigned unusedStuff:1;
+ unsigned shouldBeFF;
+
+} yaffs_PackedTags1;
+
+
+
+void yaffs_PackTags1(yaffs_PackedTags1 *pt, const yaffs_ExtendedTags *t);
+void yaffs_UnpackTags1(yaffs_ExtendedTags *t, const yaffs_PackedTags1 *pt);
+#endif
+
+
diff --git a/fs/yaffs/yaffs_packedtags2.c b/fs/yaffs/yaffs_packedtags2.c
new file mode 100644
index 0000000..f4de18d
--- /dev/null
+++ b/fs/yaffs/yaffs_packedtags2.c
@@ -0,0 +1,164 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * yaffs_packedtags2.c: Tags packing for YAFFS2
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ */
+
+#include "yaffs_packedtags2.h"
+#include "yportenv.h"
+#include "yaffs_tagsvalidity.h"
+
+
+
+// This code packs a set of extended tags into a binary structure for NAND storage
+
+// Some of the information is "extra" struff which can be packed in to speed scanning
+// This is defined by having the EXTRA_HEADER_INFO_FLAG set.
+
+
+// Extra flags applied to chunkId
+
+#define EXTRA_HEADER_INFO_FLAG 0x80000000
+#define EXTRA_SHRINK_FLAG 0x40000000
+#define EXTRA_SHADOWS_FLAG 0x20000000
+#define EXTRA_SPARE_FLAGS 0x10000000
+
+#define ALL_EXTRA_FLAGS 0xF0000000
+
+
+
+// Also, the top 4 bits of the object Id are set to the object type.
+#define EXTRA_OBJECT_TYPE_SHIFT (28)
+#define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
+
+
+
+static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
+{
+ T(YAFFS_TRACE_MTD,(TSTR("packed tags obj %d chunk %d byte %d seq %d"TENDSTR),pt->t.objectId,pt->t.chunkId,pt->t.byteCount,pt->t.sequenceNumber));
+}
+
+static void yaffs_DumpTags2(const yaffs_ExtendedTags *t)
+{
+ T(YAFFS_TRACE_MTD,(TSTR("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"TENDSTR),
+ t->eccResult, t->blockBad, t->chunkUsed, t->objectId, t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber, t->sequenceNumber));
+
+}
+
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t)
+{
+ pt->t.chunkId = t->chunkId;
+ pt->t.sequenceNumber = t->sequenceNumber;
+ pt->t.byteCount = t->byteCount;
+ pt->t.objectId = t->objectId;
+
+ if(t->chunkId == 0 && t->extraHeaderInfoAvailable)
+ {
+ // Store the extra header info instead
+ pt->t.chunkId = EXTRA_HEADER_INFO_FLAG | t->extraParentObjectId; // We save the parent object in the chunkId
+ if(t->extraIsShrinkHeader)
+ {
+ pt->t.chunkId |= EXTRA_SHRINK_FLAG;
+ }
+ if(t->extraShadows)
+ {
+ pt->t.chunkId |= EXTRA_SHADOWS_FLAG;
+ }
+
+ pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
+ pt->t.objectId |= (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
+
+ if(t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
+ {
+ pt->t.byteCount = t->extraEquivalentObjectId;
+ }
+ else if(t->extraObjectType == YAFFS_OBJECT_TYPE_FILE)
+ {
+ pt->t.byteCount = t->extraFileLength;
+ }
+ else
+ {
+ pt->t.byteCount = 0;
+ }
+ }
+
+ yaffs_DumpPackedTags2(pt);
+ yaffs_DumpTags2(t);
+
+#ifndef YAFFS_IGNORE_TAGS_ECC
+ {
+ yaffs_ECCCalculateOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&pt->ecc);
+ }
+#endif
+}
+
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
+{
+
+
+ memset(t,0,sizeof(yaffs_ExtendedTags));
+
+ yaffs_InitialiseTags(t);
+
+ if(pt->t.sequenceNumber != 0xFFFFFFFF)
+ {
+ // Page is in use
+#ifdef YAFFS_IGNORE_TAGS_ECC
+ {
+ t->eccResult = 0;
+ }
+#else
+ {
+ yaffs_ECCOther ecc;
+ yaffs_ECCCalculateOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&ecc);
+ t->eccResult = yaffs_ECCCorrectOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&pt->ecc,&ecc);
+ }
+#endif
+ t->blockBad = 0;
+ t->chunkUsed = 1;
+ t->objectId = pt->t.objectId;
+ t->chunkId = pt->t.chunkId;
+ t->byteCount = pt->t.byteCount;
+ t->chunkDeleted = 0;
+ t->serialNumber = 0;
+ t->sequenceNumber = pt->t.sequenceNumber;
+
+ // Do extra header info stuff
+
+ if(pt->t.chunkId & EXTRA_HEADER_INFO_FLAG)
+ {
+ t->chunkId = 0;
+ t->byteCount = 0;
+
+ t->extraHeaderInfoAvailable = 1;
+ t->extraParentObjectId = pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
+ t->extraIsShrinkHeader = (pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
+ t->extraShadows = (pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
+ t->extraObjectType = pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
+ t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
+
+ if(t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
+ {
+ t->extraEquivalentObjectId = pt->t.byteCount;
+ }
+ else
+ {
+ t->extraFileLength = pt->t.byteCount;
+ }
+ }
+ }
+
+ yaffs_DumpPackedTags2(pt);
+ yaffs_DumpTags2(t);
+
+}
+
diff --git a/fs/yaffs/yaffs_packedtags2.h b/fs/yaffs/yaffs_packedtags2.h
new file mode 100644
index 0000000..564dd58
--- /dev/null
+++ b/fs/yaffs/yaffs_packedtags2.h
@@ -0,0 +1,30 @@
+// This is used to pack YAFFS2 tags, not YAFFS1tags.
+
+#ifndef __YAFFS_PACKEDTAGS2_H__
+#define __YAFFS_PACKEDTAGS2_H__
+
+
+#include "yaffs_guts.h"
+#include "yaffs_ecc.h"
+
+
+typedef struct
+{
+ unsigned sequenceNumber;
+ unsigned objectId;
+ unsigned chunkId;
+ unsigned byteCount;
+} yaffs_PackedTags2TagsPart;
+
+typedef struct
+{
+ yaffs_PackedTags2TagsPart t;
+ yaffs_ECCOther ecc;
+} yaffs_PackedTags2;
+
+
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t);
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt);
+#endif
+
+
diff --git a/fs/yaffs/yaffs_tagscompat.c b/fs/yaffs/yaffs_tagscompat.c
new file mode 100644
index 0000000..fdf1cbc
--- /dev/null
+++ b/fs/yaffs/yaffs_tagscompat.c
@@ -0,0 +1,698 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_tagscompat.h: Tags compatability layer to use YAFFS1 formatted NAND.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * $Id: yaffs_tagscompat.c,v 1.3 2005/07/31 06:47:12 marty Exp $
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_ecc.h"
+
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
+#ifdef NOTYET
+static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND);
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare);
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
+#endif
+
+
+static const char yaffs_countBitsTable[256] =
+{
+0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
+};
+
+static int yaffs_CountBits(__u8 x)
+{
+ int retVal;
+ retVal = yaffs_countBitsTable[x];
+ return retVal;
+}
+
+
+/////////////// Tags ECC calculations ///////////////////
+
+void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
+{
+ yaffs_ECCCalculate(data , spare->ecc1);
+ yaffs_ECCCalculate(&data[256] , spare->ecc2);
+}
+
+void yaffs_CalcTagsECC(yaffs_Tags *tags)
+{
+ // Calculate an ecc
+
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+ unsigned i,j;
+ unsigned ecc = 0;
+ unsigned bit = 0;
+
+ tags->ecc = 0;
+
+ for(i = 0; i < 8; i++)
+ {
+ for(j = 1; j &0xff; j<<=1)
+ {
+ bit++;
+ if(b[i] & j)
+ {
+ ecc ^= bit;
+ }
+ }
+ }
+
+ tags->ecc = ecc;
+
+
+}
+
+int yaffs_CheckECCOnTags(yaffs_Tags *tags)
+{
+ unsigned ecc = tags->ecc;
+
+ yaffs_CalcTagsECC(tags);
+
+ ecc ^= tags->ecc;
+
+ if(ecc && ecc <= 64)
+ {
+ // TODO: Handle the failure better. Retire?
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+
+ ecc--;
+
+ b[ecc / 8] ^= (1 << (ecc & 7));
+
+ // Now recvalc the ecc
+ yaffs_CalcTagsECC(tags);
+
+ return 1; // recovered error
+ }
+ else if(ecc)
+ {
+ // Wierd ecc failure value
+ // TODO Need to do somethiong here
+ return -1; //unrecovered error
+ }
+
+ return 0;
+}
+
+//////////////////////////// Tags ///////////////////////////////////////
+
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+
+ yaffs_CalcTagsECC(tagsPtr);
+
+ sparePtr->tagByte0 = tu->asBytes[0];
+ sparePtr->tagByte1 = tu->asBytes[1];
+ sparePtr->tagByte2 = tu->asBytes[2];
+ sparePtr->tagByte3 = tu->asBytes[3];
+ sparePtr->tagByte4 = tu->asBytes[4];
+ sparePtr->tagByte5 = tu->asBytes[5];
+ sparePtr->tagByte6 = tu->asBytes[6];
+ sparePtr->tagByte7 = tu->asBytes[7];
+}
+
+static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+ int result;
+
+ tu->asBytes[0]= sparePtr->tagByte0;
+ tu->asBytes[1]= sparePtr->tagByte1;
+ tu->asBytes[2]= sparePtr->tagByte2;
+ tu->asBytes[3]= sparePtr->tagByte3;
+ tu->asBytes[4]= sparePtr->tagByte4;
+ tu->asBytes[5]= sparePtr->tagByte5;
+ tu->asBytes[6]= sparePtr->tagByte6;
+ tu->asBytes[7]= sparePtr->tagByte7;
+
+ result = yaffs_CheckECCOnTags(tagsPtr);
+ if(result> 0)
+ {
+ dev->tagsEccFixed++;
+ }
+ else if(result <0)
+ {
+ dev->tagsEccUnfixed++;
+ }
+}
+
+static void yaffs_SpareInitialise(yaffs_Spare *spare)
+{
+ memset(spare,0xFF,sizeof(yaffs_Spare));
+}
+
+
+
+
+static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare)
+{
+ if(chunkInNAND < dev->startBlock * dev->nChunksPerBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND));
+ return YAFFS_FAIL;
+ }
+
+ dev->nPageWrites++;
+ return dev->writeChunkToNAND(dev,chunkInNAND,data,spare);
+}
+
+
+
+static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
+ int chunkInNAND,
+ __u8 *data,
+ yaffs_Spare *spare,
+ yaffs_ECCResult *eccResult,
+ int doErrorCorrection)
+{
+ int retVal;
+ yaffs_Spare localSpare;
+
+ dev->nPageReads++;
+
+
+
+
+ if(!spare && data)
+ {
+ // If we don't have a real spare, then we use a local one.
+ // Need this for the calculation of the ecc
+ spare = &localSpare;
+ }
+
+
+ if(!dev->useNANDECC)
+ {
+ retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare);
+ if(data && doErrorCorrection)
+ {
+ // Do ECC correction
+ //Todo handle any errors
+ int eccResult1,eccResult2;
+ __u8 calcEcc[3];
+
+ yaffs_ECCCalculate(data,calcEcc);
+ eccResult1 = yaffs_ECCCorrect (data,spare->ecc1, calcEcc);
+ yaffs_ECCCalculate(&data[256],calcEcc);
+ eccResult2 = yaffs_ECCCorrect(&data[256],spare->ecc2, calcEcc);
+
+ if(eccResult1>0)
+ {
+ T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
+ dev->eccFixed++;
+ }
+ else if(eccResult1<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
+ dev->eccUnfixed++;
+ }
+
+ if(eccResult2>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
+ dev->eccFixed++;
+ }
+ else if(eccResult2<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
+ dev->eccUnfixed++;
+ }
+
+ if(eccResult1 || eccResult2)
+ {
+ // Hoosterman, we had a data problem on this page
+ yaffs_HandleReadDataError(dev,chunkInNAND);
+ }
+
+ if(eccResult1 < 0 || eccResult2 < 0)
+ *eccResult = YAFFS_ECC_RESULT_UNFIXED;
+ else if(eccResult1 > 0 || eccResult2 > 0)
+ *eccResult = YAFFS_ECC_RESULT_FIXED;
+ else
+ *eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+ }
+ }
+ else
+ {
+ // Must allocate enough memory for spare+2*sizeof(int) for ecc results from device.
+ struct yaffs_NANDSpare nspare;
+ retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare*)&nspare);
+ memcpy (spare, &nspare, sizeof(yaffs_Spare));
+ if(data && doErrorCorrection)
+ {
+ if(nspare.eccres1>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
+ }
+ else if(nspare.eccres1<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
+ }
+
+ if(nspare.eccres2>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
+ }
+ else if(nspare.eccres2<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
+ }
+
+ if(nspare.eccres1 || nspare.eccres2)
+ {
+ // Hoosterman, we had a data problem on this page
+ yaffs_HandleReadDataError(dev,chunkInNAND);
+ }
+
+ if(nspare.eccres1 < 0 || nspare.eccres2 < 0)
+ *eccResult = YAFFS_ECC_RESULT_UNFIXED;
+ else if(nspare.eccres1 > 0 || nspare.eccres2 > 0)
+ *eccResult = YAFFS_ECC_RESULT_FIXED;
+ else
+ *eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+
+
+ }
+ }
+ return retVal;
+}
+
+#ifdef NOTYET
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
+{
+
+ static int init = 0;
+ static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
+ static __u8 data[YAFFS_BYTES_PER_CHUNK];
+ // Might as well always allocate the larger size for dev->useNANDECC == true;
+ static __u8 spare[sizeof(struct yaffs_NANDSpare)];
+
+ dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare);
+
+ if(!init)
+ {
+ memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK);
+ init = 1;
+ }
+
+ if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) return YAFFS_FAIL;
+ if(memcmp(cmpbuf,spare,16)) return YAFFS_FAIL;
+
+
+ return YAFFS_OK;
+
+}
+#endif
+
+#if 0
+int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
+{
+ dev->nBlockErasures++;
+ return dev->eraseBlockInNAND(dev,blockInNAND);
+}
+
+int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
+{
+ return dev->initialiseNAND(dev);
+}
+
+#endif
+
+#if 0
+static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve)
+{
+ int chunk;
+
+ int writeOk = 1;
+ int attempts = 0;
+
+ unsigned char rbData[YAFFS_BYTES_PER_CHUNK];
+ yaffs_Spare rbSpare;
+
+ do{
+ chunk = yaffs_AllocateChunk(dev,useReserve);
+
+ if(chunk >= 0)
+ {
+
+ // First check this chunk is erased...
+#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
+ writeOk = yaffs_CheckChunkErased(dev,chunk);
+#endif
+ if(!writeOk)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
+ }
+ else
+ {
+ writeOk = yaffs_WriteChunkToNAND(dev,chunk,data,spare);
+ }
+ attempts++;
+ if(writeOk)
+ {
+ // Readback & verify
+ // If verify fails, then delete this chunk and try again
+ // To verify we compare everything except the block and
+ // page status bytes.
+ // NB We check a raw read without ECC correction applied
+ yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare,0);
+
+#ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
+ if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare))
+ {
+ // Didn't verify
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write verify failed on chunk %d" TENDSTR), chunk));
+
+ writeOk = 0;
+ }
+#endif
+
+ }
+ if(writeOk)
+ {
+ // Copy the data into the write buffer.
+ // NB We do this at the end to prevent duplicates in the case of a write error.
+ //Todo
+ yaffs_HandleWriteChunkOk(dev,chunk,data,spare);
+ }
+ else
+ {
+ yaffs_HandleWriteChunkError(dev,chunk);
+ }
+ }
+
+ } while(chunk >= 0 && ! writeOk);
+
+ if(attempts > 1)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
+ dev->nRetriedWrites+= (attempts - 1);
+ }
+
+ return chunk;
+}
+
+#endif
+
+///
+// Functions for robustisizing
+//
+//
+#if 0
+
+static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
+{
+ // Ding the blockStatus in the first two pages of the block.
+
+ yaffs_Spare spare;
+
+ memset(&spare, 0xff,sizeof(yaffs_Spare));
+
+ spare.blockStatus = 0;
+
+ // TODO change this retirement marking for other NAND types
+ yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL , &spare);
+ yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1, NULL , &spare);
+
+ yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
+ dev->nRetiredBlocks++;
+}
+
+#endif
+
+#if 0
+static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
+{
+ dev->doingBufferedBlockRewrite = 1;
+ //
+ // Remove erased chunks
+ // Rewrite existing chunks to a new block
+ // Set current write block to the new block
+
+ dev->doingBufferedBlockRewrite = 0;
+
+ return 1;
+}
+
+#endif
+
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
+
+
+ //TODO
+ // Just do a garbage collection on the affected block then retire the block
+ // NB recursion
+}
+
+
+#ifdef NOTYET
+static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
+{
+}
+
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
+{
+}
+
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare)
+{
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ // Delete the chunk
+ yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
+}
+
+
+
+
+static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1)
+{
+
+
+ if( memcmp(d0,d1,YAFFS_BYTES_PER_CHUNK) != 0 ||
+ s0->tagByte0 != s1->tagByte0 ||
+ s0->tagByte1 != s1->tagByte1 ||
+ s0->tagByte2 != s1->tagByte2 ||
+ s0->tagByte3 != s1->tagByte3 ||
+ s0->tagByte4 != s1->tagByte4 ||
+ s0->tagByte5 != s1->tagByte5 ||
+ s0->tagByte6 != s1->tagByte6 ||
+ s0->tagByte7 != s1->tagByte7 ||
+ s0->ecc1[0] != s1->ecc1[0] ||
+ s0->ecc1[1] != s1->ecc1[1] ||
+ s0->ecc1[2] != s1->ecc1[2] ||
+ s0->ecc2[0] != s1->ecc2[0] ||
+ s0->ecc2[1] != s1->ecc2[1] ||
+ s0->ecc2[2] != s1->ecc2[2] )
+ {
+ return 0;
+ }
+
+ return 1;
+}
+#endif /* NOTYET */
+
+#if 0
+typedef struct
+{
+
+ unsigned validMarker0;
+ unsigned chunkUsed; // Status of the chunk: used or unused
+ unsigned objectId; // If 0 then this is not part of an object (unused)
+ unsigned chunkId; // If 0 then this is a header
+ unsigned byteCount; // Only valid for data chunks
+ // The following stuff only has meaning when we read
+ yaffs_ECCResult eccResult; // Only valid when we read.
+ unsigned blockBad; // Only valid on reading
+
+ // YAFFS 1 stuff
+ unsigned chunkDeleted; // The chunk is marked deleted
+ unsigned serialNumber; // Yaffs1 2-bit serial number
+
+ // YAFFS2 stuff
+ unsigned sequenceNumber; // The sequence number of this block
+
+ unsigned validMarker1;
+
+} yaffs_ExtendedTags;
+
+
+typedef struct
+{
+ unsigned chunkId:20;
+ unsigned serialNumber:2;
+ unsigned byteCount:10;
+ unsigned objectId:18;
+ unsigned ecc:12;
+ unsigned unusedStuff:2;
+} yaffs_Tags;
+
+
+#endif
+
+int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *eTags)
+{
+ yaffs_Spare spare;
+ yaffs_Tags tags;
+
+ yaffs_SpareInitialise(&spare);
+
+ if(eTags->chunkDeleted)
+ {
+ spare.pageStatus = 0;
+ }
+ else
+ {
+ tags.objectId = eTags->objectId;
+ tags.chunkId = eTags->chunkId;
+ tags.byteCount = eTags->byteCount;
+ tags.serialNumber = eTags->serialNumber;
+
+// NCB
+ if (!dev->useNANDECC && data)
+ {
+ yaffs_CalcECC(data,&spare);
+ }
+
+// /NCB
+ yaffs_LoadTagsIntoSpare(&spare,&tags);
+
+ }
+
+ return yaffs_WriteChunkToNAND(dev,chunkInNAND,data,&spare);
+}
+
+
+int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *eTags)
+{
+
+ yaffs_Spare spare;
+ yaffs_Tags tags;
+ yaffs_ECCResult eccResult;
+
+// NCB
+ static yaffs_Spare spareFF;
+ static int init;
+
+ if(!init)
+ {
+ memset(&spareFF,0xFF,sizeof(spareFF));
+ init = 1;
+ }
+// /NCB
+ if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,data,&spare,&eccResult,1))
+ {
+// added NCB - eTags may be NULL
+ if (eTags) {
+
+ int deleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
+
+ yaffs_GetTagsFromSpare(dev,&spare,&tags);
+
+ eTags->chunkDeleted = deleted;
+ eTags->objectId = tags.objectId;
+ eTags->chunkId = tags.chunkId;
+ eTags->byteCount = tags.byteCount;
+ eTags->serialNumber = tags.serialNumber;
+ eTags->eccResult = eccResult;
+ eTags->blockBad = 0; // We're reading it therefore it is not a bad block
+
+// NCB added 18/2/2005
+ eTags->chunkUsed = (memcmp(&spareFF,&spare,sizeof(spareFF)) != 0) ? 1:0;
+ }
+
+ return YAFFS_OK;
+ }
+ else
+ {
+ return YAFFS_FAIL;
+ }
+}
+
+int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockInNAND)
+{
+
+ yaffs_Spare spare;
+
+ memset(&spare, 0xff,sizeof(yaffs_Spare));
+
+ spare.blockStatus = 0;
+
+ yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL , &spare);
+ yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1, NULL , &spare);
+
+ return YAFFS_OK;
+
+}
+
+
+int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
+{
+
+ yaffs_Spare spare0,spare1;
+ static yaffs_Spare spareFF;
+ static int init;
+ yaffs_ECCResult dummy;
+
+ if(!init)
+ {
+ memset(&spareFF,0xFF,sizeof(spareFF));
+ init = 1;
+ }
+
+ *sequenceNumber = 0;
+
+ yaffs_ReadChunkFromNAND(dev,blockNo * dev->nChunksPerBlock,NULL,&spare0,&dummy,1);
+ yaffs_ReadChunkFromNAND(dev,blockNo * dev->nChunksPerBlock + 1,NULL,&spare1,&dummy,1);
+
+ if(yaffs_CountBits(spare0.blockStatus & spare1.blockStatus) < 7)
+ *state = YAFFS_BLOCK_STATE_DEAD;
+ else if(memcmp(&spareFF,&spare0,sizeof(spareFF)) == 0)
+ *state = YAFFS_BLOCK_STATE_EMPTY;
+ else
+ *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+
+ return YAFFS_OK;
+}
+
diff --git a/fs/yaffs/yaffs_tagscompat.h b/fs/yaffs/yaffs_tagscompat.h
new file mode 100644
index 0000000..20b627f
--- /dev/null
+++ b/fs/yaffs/yaffs_tagscompat.h
@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_ramdisk.h: yaffs ram disk component
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * $Id: yaffs_tagscompat.h,v 1.1 2004/11/03 08:14:07 charles Exp $
+ */
+
+// This provides a rma disk under yaffs.
+// NB this is not intended for NAND emulation.
+// Use this with dev->useNANDECC enabled, then ECC overheads are not required.
+
+#ifndef __YAFFS_TAGSCOMPAT_H__
+#define __YAFFS_TAGSCOMPAT_H__
+
+
+#include "yaffs_guts.h"
+int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags);
+int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+
+#endif
diff --git a/fs/yaffs/yaffs_tagsvalidity.c b/fs/yaffs/yaffs_tagsvalidity.c
new file mode 100644
index 0000000..2cbbeaa
--- /dev/null
+++ b/fs/yaffs/yaffs_tagsvalidity.c
@@ -0,0 +1,35 @@
+
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * $Id: yaffs_tagsvalidity.c,v 1.1 2005/04/29 18:09:16 charles Exp $
+ */
+//yaffs_tagsvalidity.c
+
+#include "yaffs_tagsvalidity.h"
+
+
+
+void yaffs_InitialiseTags(yaffs_ExtendedTags *tags)
+{
+ memset(tags,0,sizeof(yaffs_ExtendedTags));
+ tags->validMarker0 = 0xAAAAAAAA;
+ tags->validMarker1 = 0x55555555;
+}
+
+int yaffs_ValidateTags(yaffs_ExtendedTags *tags)
+{
+ return (tags->validMarker0 == 0xAAAAAAAA &&
+ tags->validMarker1 == 0x55555555);
+
+}
+
diff --git a/fs/yaffs/yaffs_tagsvalidity.h b/fs/yaffs/yaffs_tagsvalidity.h
new file mode 100644
index 0000000..26673d1
--- /dev/null
+++ b/fs/yaffs/yaffs_tagsvalidity.h
@@ -0,0 +1,27 @@
+
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * $Id: yaffs_tagsvalidity.h,v 1.1 2005/04/29 18:09:16 charles Exp $
+ */
+//yaffs_tagsvalidity.h
+
+
+#ifndef __YAFFS_TAGS_VALIDITY_H__
+#define __YAFFS_TAGS_VALIDITY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_InitialiseTags(yaffs_ExtendedTags *tags);
+int yaffs_ValidateTags(yaffs_ExtendedTags *tags);
+#endif
+
diff --git a/fs/yaffs/yaffsinterface.h b/fs/yaffs/yaffsinterface.h
new file mode 100644
index 0000000..e4b0ff1
--- /dev/null
+++ b/fs/yaffs/yaffsinterface.h
@@ -0,0 +1,25 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffsinterface.h: Interface to the guts of yaffs.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ */
+
+#ifndef __YAFFSINTERFACE_H__
+#define __YAFFSINTERFACE_H__
+
+
+int yaffs_Initialise(unsigned nBlocks);
+
+#endif
+
diff --git a/fs/yaffs/yportenv.h b/fs/yaffs/yportenv.h
new file mode 100644
index 0000000..13c63bb
--- /dev/null
+++ b/fs/yaffs/yportenv.h
@@ -0,0 +1,165 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yportenv.h: Portable services used by yaffs. This is done to allow
+ * simple migration from kernel space into app space for testing.
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * $Id: yportenv.h,v 1.6 2005/07/31 00:26:57 charles Exp $
+ *
+ */
+
+#ifndef __YPORTENV_H__
+#define __YPORTENV_H__
+
+
+#if defined CONFIG_YAFFS_WINCE
+
+#include "ywinceenv.h"
+
+#elif defined __KERNEL__
+
+
+
+// Linux kernel
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x) x
+#define yaffs_strcpy(a,b) strcpy(a,b)
+#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
+#define yaffs_strlen(s) strlen(s)
+#define yaffs_sprintf sprintf
+#define yaffs_toupper(a) toupper(a)
+
+#define Y_INLINE inline
+
+#define YAFFS_LOSTNFOUND_NAME "lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX "obj"
+
+//#define YPRINTF(x) printk x
+#define YMALLOC(x) kmalloc(x,GFP_KERNEL)
+#define YFREE(x) kfree(x)
+
+#define YAFFS_ROOT_MODE 0666
+#define YAFFS_LOSTNFOUND_MODE 0666
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
+#define Y_TIME_CONVERT(x) (x).tv_sec
+#else
+#define Y_CURRENT_TIME CURRENT_TIME
+#define Y_TIME_CONVERT(x) (x)
+#endif
+
+#define yaffs_SumCompare(x,y) ((x) == (y))
+#define yaffs_strcmp(a,b) strcmp(a,b)
+
+#define TENDSTR "\n"
+#define TSTR(x) KERN_WARNING x
+#define TOUT(p) printk p
+
+
+#elif defined CONFIG_YAFFS_DIRECT
+
+// Direct interface
+#include "ydirectenv.h"
+
+#elif defined CONFIG_YAFFS_UTIL
+
+// Stuff for YAFFS utilities
+
+#include "stdlib.h"
+#include "stdio.h"
+#include "string.h"
+
+#include "devextras.h"
+
+#define YMALLOC(x) malloc(x)
+#define YFREE(x) free(x)
+
+
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x) x
+#define yaffs_strcpy(a,b) strcpy(a,b)
+#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
+#define yaffs_strlen(s) strlen(s)
+#define yaffs_sprintf sprintf
+#define yaffs_toupper(a) toupper(a)
+
+#define Y_INLINE inline
+
+//#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s))
+//#define YALERT(s) YINFO(s)
+
+
+#define TENDSTR "\n"
+#define TSTR(x) x
+#define TOUT(p) printf p
+
+
+#define YAFFS_LOSTNFOUND_NAME "lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX "obj"
+//#define YPRINTF(x) printf x
+
+
+#define YAFFS_ROOT_MODE 0666
+#define YAFFS_LOSTNFOUND_MODE 0666
+
+#define yaffs_SumCompare(x,y) ((x) == (y))
+#define yaffs_strcmp(a,b) strcmp(a,b)
+
+#else
+// Should have specified a configuration type
+#error Unknown configuration
+
+#endif
+
+
+extern unsigned yaffs_traceMask;
+
+#define YAFFS_TRACE_ERROR 0x00000001
+#define YAFFS_TRACE_OS 0x00000002
+#define YAFFS_TRACE_ALLOCATE 0x00000004
+#define YAFFS_TRACE_SCAN 0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS 0x00000010
+#define YAFFS_TRACE_ERASE 0x00000020
+#define YAFFS_TRACE_GC 0x00000040
+#define YAFFS_TRACE_WRITE 0x00000080
+#define YAFFS_TRACE_TRACING 0x00000100
+#define YAFFS_TRACE_DELETION 0x00000200
+#define YAFFS_TRACE_BUFFERS 0x00000400
+#define YAFFS_TRACE_NANDACCESS 0x00000800
+#define YAFFS_TRACE_GC_DETAIL 0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG 0x00002000
+#define YAFFS_TRACE_MTD 0x00004000
+#define YAFFS_TRACE_ALWAYS 0x40000000
+#define YAFFS_TRACE_BUG 0x80000000
+
+#define T(mask,p) do{ if((mask) & (yaffs_traceMask | YAFFS_TRACE_ERROR)) TOUT(p);} while(0)
+
+
+#ifndef CONFIG_YAFFS_WINCE
+#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),__LINE__))
+#endif
+
+#endif
+
+
Reference in New Issue View Git Blame Copy Permalink