63 lines
1.7 KiB
Diff
63 lines
1.7 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
|
|
Subject: jffs2: use .rename2 and add RENAME_WHITEOUT support
|
|
|
|
It is required for renames on overlayfs
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
|
|
--- a/fs/jffs2/dir.c
|
|
+++ b/fs/jffs2/dir.c
|
|
@@ -756,6 +756,24 @@ 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,
|
|
unsigned int flags)
|
|
@@ -766,7 +784,7 @@ static int jffs2_rename (struct inode *o
|
|
uint8_t type;
|
|
uint32_t now;
|
|
|
|
- if (flags & ~RENAME_NOREPLACE)
|
|
+ if (flags & ~(RENAME_NOREPLACE|RENAME_WHITEOUT))
|
|
return -EINVAL;
|
|
|
|
/* The VFS will check for us and prevent trying to rename a
|
|
@@ -832,9 +850,14 @@ static int jffs2_rename (struct inode *o
|
|
if (d_is_dir(old_dentry) && !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 */
|
|
|