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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>
This commit is contained in:
Shuoran Liu 2016-08-25 20:42:09 +08:00 committed by Jaegeuk Kim
parent dfd02e4de1
commit 5d2b42ede7
1 changed files with 4 additions and 1 deletions
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5
fs/f2fs/dir.c
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@ -172,7 +172,10 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir,
int max_slots; int max_slots;
f2fs_hash_t namehash; 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); nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
nblock = bucket_blocks(level); nblock = bucket_blocks(level);