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authorFelix Fietkau <nbd@openwrt.org>2015-04-10 11:52:59 +0000
committerFelix Fietkau <nbd@openwrt.org>2015-04-10 11:52:59 +0000
commit9428c5609bd02c456dafe5fa21da4190014bea75 (patch)
tree497b5445ad57e13341d9cd2b1471f82a9072dc74 /target/linux/generic/patches-4.0
parent42e950ec7532b34f8a047f003c43840a0bb11256 (diff)
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kernel: add jffs2 RENAME_WHITEOUT support, fixes overlayfs renames (#19432)
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 45362
Diffstat (limited to 'target/linux/generic/patches-4.0')
-rw-r--r--target/linux/generic/patches-4.0/110-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch86
1 files changed, 86 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.0/110-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch b/target/linux/generic/patches-4.0/110-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch
new file mode 100644
index 0000000000..4ffa3c26fe
--- /dev/null
+++ b/target/linux/generic/patches-4.0/110-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch
@@ -0,0 +1,86 @@
+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 */
+