ext4: clean up return values in handle_mount_opt()

Clean up return values in handle_mount_opt() and rename the function to
ext4_parse_param()

Now we can use it in fs_context_operations as .parse_param.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Link: https://lore.kernel.org/r/20211027141857.33657-11-lczerner@redhat.comSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/super.c

@@ -92,6 +92,7 @@ static int ext4_validate_options(struct fs_context *fc);
 static int ext4_check_opt_consistency(struct fs_context *fc,
 				      struct super_block *sb);
 static int ext4_apply_options(struct fs_context *fc, struct super_block *sb);
+static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param);
 
 /*
  * Lock ordering
@@ -119,6 +120,11 @@ static int ext4_apply_options(struct fs_context *fc, struct super_block *sb);
  * transaction start -> page lock(s) -> i_data_sem (rw)
  */
 
+static const struct fs_context_operations ext4_context_ops = {
+	.parse_param	= ext4_parse_param,
+};
+
+
 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
 static struct file_system_type ext2_fs_type = {
 	.owner		= THIS_MODULE,
@@ -2276,7 +2282,7 @@ EXT4_SET_CTX(mount_opt);
 EXT4_SET_CTX(mount_opt2);
 EXT4_SET_CTX(mount_flags);
 
-static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param)
+static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
 {
 	struct ext4_fs_context *ctx = fc->fs_private;
 	struct fs_parse_result result;
@@ -2317,30 +2323,30 @@ static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param)
 			ctx->s_sb_block = result.uint_32;
 			ctx->spec |= EXT4_SPEC_s_sb_block;
 		}
-		return 1;
+		return 0;
 	case Opt_removed:
 		ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option",
 			 param->key);
-		return 1;
+		return 0;
 	case Opt_abort:
 		ctx_set_mount_flags(ctx, EXT4_MF_FS_ABORTED);
-		return 1;
+		return 0;
 	case Opt_i_version:
 		ctx_set_flags(ctx, SB_I_VERSION);
-		return 1;
+		return 0;
 	case Opt_lazytime:
 		ctx_set_flags(ctx, SB_LAZYTIME);
-		return 1;
+		return 0;
 	case Opt_nolazytime:
 		ctx_clear_flags(ctx, SB_LAZYTIME);
-		return 1;
+		return 0;
 	case Opt_inlinecrypt:
 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
 		ctx_set_flags(ctx, SB_INLINECRYPT);
 #else
 		ext4_msg(NULL, KERN_ERR, "inline encryption not supported");
 #endif
-		return 1;
+		return 0;
 	case Opt_errors:
 	case Opt_data:
 	case Opt_data_err:
@@ -2492,7 +2498,7 @@ static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param)
 		if (param->type == fs_value_is_flag) {
 			ctx->spec |= EXT4_SPEC_DUMMY_ENCRYPTION;
 			ctx->test_dummy_enc_arg = NULL;
-			return 1;
+			return 0;
 		}
 		if (*param->string &&
 		    !(!strcmp(param->string, "v1") ||
@@ -2583,7 +2589,7 @@ static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param)
 				ctx_clear_mount_opt(ctx, m->mount_opt);
 		}
 	}
-	return 1;
+	return 0;
 }
 
 static int parse_options(struct fs_context *fc, char *options)
@@ -2619,7 +2625,7 @@ static int parse_options(struct fs_context *fc, char *options)
 			param.key = key;
 			param.size = v_len;
 
-			ret = handle_mount_opt(fc, &param);
+			ret = ext4_parse_param(fc, &param);
 			if (param.string)
 				kfree(param.string);
 			if (ret < 0)