f2fs: fix a bug when using namehash to locate dentry bucket

In the following scenario,

1) we don't have the key and doing a lookup for encrypted file,
2) and the encrypted filename is big name

we should use fname->hash as name hash value instead of what is
calculated by fname->disk_name. Because in such case,
fname->disk_name is empty.

Signed-off-by: Shuoran Liu <liushuoran@huawei.com>
Acked-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 9054aea..b3e6f7f 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -172,7 +172,10 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir,
        int max_slots;
        f2fs_hash_t namehash;
 
-       namehash = f2fs_dentry_hash(&name);
+       if(fname->hash)
+               namehash = cpu_to_le32(fname->hash);
+       else
+               namehash = f2fs_dentry_hash(&name);
 
        nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
        nblock = bucket_blocks(level);