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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
@@ -609,7 +609,8 @@ static int jffs2_rmdir (struct inode *di
return ret;
}
-static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
+static int __jffs2_mknod (struct inode *dir_i, struct dentry *dentry,
+ umode_t mode, dev_t rdev, bool whiteout)
{
struct jffs2_inode_info *f, *dir_f;
struct jffs2_sb_info *c;
@@ -748,7 +749,11 @@ static int jffs2_mknod (struct inode *di
mutex_unlock(&dir_f->sem);
jffs2_complete_reservation(c);
- d_instantiate_new(dentry, inode);
+ if (!whiteout)
+ d_instantiate_new(dentry, inode);
+ else
+ unlock_new_inode(inode);
+
return 0;
fail:
@@ -756,6 +761,17 @@ static int jffs2_mknod (struct inode *di
return ret;
}
+static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+ return __jffs2_mknod(dir_i, dentry, mode, rdev, false);
+}
+
+static int jffs2_whiteout (struct inode *old_dir, struct dentry *old_dentry)
+{
+ return __jffs2_mknod(old_dir, old_dentry, S_IFCHR | WHITEOUT_MODE,
+ WHITEOUT_DEV, true);
+}
+
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 +782,7 @@ 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 +848,14 @@ 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 */
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