87 lines
2.6 KiB
Diff
87 lines
2.6 KiB
Diff
From: Felix Fietkau <nbd@openwrt.org>
|
|
Date: Fri, 10 Apr 2015 13:35:29 +0200
|
|
Subject: [PATCH] jffs2: use .rename2 and add RENAME_WHITEOUT support
|
|
|
|
It is required for renames on overlayfs
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
|
|
---
|
|
|
|
--- a/fs/jffs2/dir.c
|
|
+++ b/fs/jffs2/dir.c
|
|
@@ -35,7 +35,7 @@ static int jffs2_mkdir (struct inode *,s
|
|
static int jffs2_rmdir (struct inode *,struct dentry *);
|
|
static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
|
|
static int jffs2_rename (struct inode *, struct dentry *,
|
|
- struct inode *, struct dentry *);
|
|
+ struct inode *, struct dentry *, unsigned int);
|
|
|
|
const struct file_operations jffs2_dir_operations =
|
|
{
|
|
@@ -57,7 +57,7 @@ const struct inode_operations jffs2_dir_
|
|
.mkdir = jffs2_mkdir,
|
|
.rmdir = jffs2_rmdir,
|
|
.mknod = jffs2_mknod,
|
|
- .rename = jffs2_rename,
|
|
+ .rename2 = jffs2_rename,
|
|
.get_acl = jffs2_get_acl,
|
|
.set_acl = jffs2_set_acl,
|
|
.setattr = jffs2_setattr,
|
|
@@ -756,8 +756,27 @@ static int jffs2_mknod (struct inode *di
|
|
return ret;
|
|
}
|
|
|
|
+static int jffs2_whiteout(struct inode *old_dir, struct dentry *old_dentry)
|
|
+{
|
|
+ struct dentry *wh;
|
|
+ int err;
|
|
+
|
|
+ wh = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
|
|
+ if (!wh)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ err = jffs2_mknod(old_dir, wh, S_IFCHR | WHITEOUT_MODE,
|
|
+ WHITEOUT_DEV);
|
|
+ if (err)
|
|
+ return err;
|
|
+
|
|
+ d_rehash(wh);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
|
|
- struct inode *new_dir_i, struct dentry *new_dentry)
|
|
+ struct inode *new_dir_i, struct dentry *new_dentry,
|
|
+ unsigned int flags)
|
|
{
|
|
int ret;
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
|
|
@@ -765,6 +784,9 @@ static int jffs2_rename (struct inode *o
|
|
uint8_t type;
|
|
uint32_t now;
|
|
|
|
+ if (flags & ~RENAME_WHITEOUT)
|
|
+ return -EINVAL;
|
|
+
|
|
/* The VFS will check for us and prevent trying to rename a
|
|
* file over a directory and vice versa, but if it's a directory,
|
|
* the VFS can't check whether the victim is empty. The filesystem
|
|
@@ -828,9 +850,14 @@ static int jffs2_rename (struct inode *o
|
|
if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
|
|
inc_nlink(new_dir_i);
|
|
|
|
- /* Unlink the original */
|
|
- ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
|
|
- old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
|
|
+ if (flags & RENAME_WHITEOUT)
|
|
+ /* Replace with whiteout */
|
|
+ ret = jffs2_whiteout(old_dir_i, old_dentry);
|
|
+ else
|
|
+ /* Unlink the original */
|
|
+ ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
|
|
+ old_dentry->d_name.name,
|
|
+ old_dentry->d_name.len, NULL, now);
|
|
|
|
/* We don't touch inode->i_nlink */
|
|
|