ext4: factor out ext4_hash_info_init()

Factor out ext4_hash_info_init() to simplify __ext4_fill_super(). No
functional change.
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20230323140517.1070239-2-yanaijie@huawei.comSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/super.c

@@ -5024,6 +5024,35 @@ static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb,
 	return ret;
 }
 
+static void ext4_hash_info_init(struct super_block *sb)
+{
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+	struct ext4_super_block *es = sbi->s_es;
+	unsigned int i;
+
+	for (i = 0; i < 4; i++)
+		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
+
+	sbi->s_def_hash_version = es->s_def_hash_version;
+	if (ext4_has_feature_dir_index(sb)) {
+		i = le32_to_cpu(es->s_flags);
+		if (i & EXT2_FLAGS_UNSIGNED_HASH)
+			sbi->s_hash_unsigned = 3;
+		else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
+#ifdef __CHAR_UNSIGNED__
+			if (!sb_rdonly(sb))
+				es->s_flags |=
+					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
+			sbi->s_hash_unsigned = 3;
+#else
+			if (!sb_rdonly(sb))
+				es->s_flags |=
+					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
+#endif
+		}
+	}
+}
+
 static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 {
 	struct ext4_super_block *es = NULL;
@@ -5179,26 +5208,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
 	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
 
-	for (i = 0; i < 4; i++)
-		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
-	sbi->s_def_hash_version = es->s_def_hash_version;
-	if (ext4_has_feature_dir_index(sb)) {
-		i = le32_to_cpu(es->s_flags);
-		if (i & EXT2_FLAGS_UNSIGNED_HASH)
-			sbi->s_hash_unsigned = 3;
-		else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
-#ifdef __CHAR_UNSIGNED__
-			if (!sb_rdonly(sb))
-				es->s_flags |=
-					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
-			sbi->s_hash_unsigned = 3;
-#else
-			if (!sb_rdonly(sb))
-				es->s_flags |=
-					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
-#endif
-		}
-	}
+	ext4_hash_info_init(sb);
 
 	if (ext4_handle_clustersize(sb))
 		goto failed_mount;