[PATCH 1/2] f2fs: fix i_current_depth during inline dentry conversion

[PATCH 1/2] f2fs: fix i_current_depth during inline dentry conversion

[Chao Yu]

With below steps, we will see that dentry page becoming unaccessable later.
This is because we forget updating i_current_depth in inode during inline
dentry conversion, after that, once we failed at somewhere, it will leave
i_current_depth as 0 in non-inline directory. Then, during ->lookup, the
current_depth value makes all dentry pages in first level invisible. Fix
it.

1) mount f2fs with inline_dentry option
2) mkdir dir
3) touch 180 files named [0-179] in dir
4) touch 180 in dir (fail after inline dir conversion)
5) ll dir

ls: cannot access /mnt/f2fs/dir/0: No such file or directory
ls: cannot access /mnt/f2fs/dir/1: No such file or directory
ls: cannot access /mnt/f2fs/dir/2: No such file or directory
ls: cannot access /mnt/f2fs/dir/3: No such file or directory
ls: cannot access /mnt/f2fs/dir/4: No such file or directory

drwxr-xr-x 2 root root 4096  may 13 21:47 ./
drwxr-xr-x 3 root root 4096  may 13 21:46 ../
-????????? ? ?    ?       ?             ? 0
-????????? ? ?    ?       ?             ? 1
-????????? ? ?    ?       ?             ? 10
-????????? ? ?    ?       ?             ? 100
-????????? ? ?    ?       ?             ? 101
-????????? ? ?    ?       ?             ? 102

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
 fs/f2fs/inline.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 8a51955..60ba7ac 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -400,6 +400,7 @@ static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,
 	stat_dec_inline_dir(dir);
 	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 
+	F2FS_I(dir)->i_current_depth = 1;
 	if (i_size_read(dir) < PAGE_SIZE) {
 		i_size_write(dir, PAGE_SIZE);
 		set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
-- 
2.8.2.311.gee88674

[PATCH 2/2] f2fs: fix incorrect error path handling in f2fs_move_rehashed_dirents

[Chao Yu]

Fix two bugs in error path of f2fs_move_rehashed_dirents:
 - release dir's inode page if fail to call kmalloc
 - recover i_current_depth if fail to converting

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
 fs/f2fs/inline.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 60ba7ac..a4bb155 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -464,12 +464,15 @@ static int f2fs_move_rehashed_dirents(struct inode *dir, struct page *ipage,
 				struct f2fs_inline_dentry *inline_dentry)
 {
 	struct f2fs_inline_dentry *backup_dentry;
+	struct f2fs_inode_info *fi = F2FS_I(dir);
 	int err;
 
 	backup_dentry = f2fs_kmalloc(sizeof(struct f2fs_inline_dentry),
 							GFP_F2FS_ZERO);
-	if (!backup_dentry)
+	if (!backup_dentry) {
+		f2fs_put_page(ipage, 1);
 		return -ENOMEM;
+	}
 
 	memcpy(backup_dentry, inline_dentry, MAX_INLINE_DATA);
 	truncate_inline_inode(ipage, 0);
@@ -483,13 +486,14 @@ static int f2fs_move_rehashed_dirents(struct inode *dir, struct page *ipage,
 	lock_page(ipage);
 
 	stat_dec_inline_dir(dir);
-	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
+	clear_inode_flag(fi, FI_INLINE_DENTRY);
 	update_inode(dir, ipage);
 	kfree(backup_dentry);
 	return 0;
 recover:
 	lock_page(ipage);
 	memcpy(inline_dentry, backup_dentry, MAX_INLINE_DATA);
+	fi->i_current_depth = 0;
 	i_size_write(dir, MAX_INLINE_DATA);
 	update_inode(dir, ipage);
 	f2fs_put_page(ipage, 1);
-- 
2.8.2.311.gee88674