f2fs: switch to using fscrypt_match_name()

Switch f2fs directory searches to use the fscrypt_match_name() helper
function.  There should be no functional change.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/f2fs/dir.c

@@ -111,8 +111,6 @@ struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname,
 	struct f2fs_dir_entry *de;
 	unsigned long bit_pos = 0;
 	int max_len = 0;
-	struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
-	struct fscrypt_str *name = &fname->disk_name;
 
 	if (max_slots)
 		*max_slots = 0;
@@ -130,29 +128,11 @@ struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname,
 			continue;
 		}
 
-		if (de->hash_code != namehash)
-			goto not_match;
-
-		de_name.name = d->filename[bit_pos];
-		de_name.len = le16_to_cpu(de->name_len);
-
-#ifdef CONFIG_F2FS_FS_ENCRYPTION
-		if (unlikely(!name->name)) {
-			if (fname->usr_fname->name[0] == '_') {
-				if (de_name.len > 32 &&
-					!memcmp(de_name.name + ((de_name.len - 17) & ~15),
-						fname->crypto_buf.name + 8, 16))
-					goto found;
-				goto not_match;
-			}
-			name->name = fname->crypto_buf.name;
-			name->len = fname->crypto_buf.len;
-		}
-#endif
-		if (de_name.len == name->len &&
-				!memcmp(de_name.name, name->name, name->len))
+		if (de->hash_code == namehash &&
+		    fscrypt_match_name(fname, d->filename[bit_pos],
+				       le16_to_cpu(de->name_len)))
 			goto found;
-not_match:
+
 		if (max_slots && max_len > *max_slots)
 			*max_slots = max_len;
 		max_len = 0;