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Diffstat (limited to 'target/linux/generic/patches-4.9/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch')
-rw-r--r--target/linux/generic/patches-4.9/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch63
1 files changed, 63 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.9/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch b/target/linux/generic/patches-4.9/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch
new file mode 100644
index 0000000..1054802
--- /dev/null
+++ b/target/linux/generic/patches-4.9/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch
@@ -0,0 +1,63 @@
+From: Felix Fietkau <nbd@nbd.name>
+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@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 */
+