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: NShuoran Liu <liushuoran@huawei.com> Acked-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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