btrfS: collapse btrfs_handle_error() into __btrfs_handle_fs_error()

There is no other consumer for btrfs_handle_error() other than
__btrfs_handle_fs_error(), further this function quite small.
Merge it into its parent.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
[ reformat comment ]
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/super.c

@@ -107,28 +107,6 @@ const char *btrfs_decode_error(int errno)
 	return errstr;
 }
 
-/* btrfs handle error by forcing the filesystem readonly */
-static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
-{
-	struct super_block *sb = fs_info->sb;
-
-	if (sb_rdonly(sb))
-		return;
-
-	sb->s_flags |= SB_RDONLY;
-	btrfs_info(fs_info, "forced readonly");
-	/*
-	 * Note that a running device replace operation is not
-	 * canceled here although there is no way to update
-	 * the progress. It would add the risk of a deadlock,
-	 * therefore the canceling is omitted. The only penalty
-	 * is that some I/O remains active until the procedure
-	 * completes. The next time when the filesystem is
-	 * mounted writeable again, the device replace
-	 * operation continues.
-	 */
-}
-
 /*
  * __btrfs_handle_fs_error decodes expected errors from the caller and
  * invokes the approciate error response.
@@ -175,8 +153,23 @@ void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function
 	set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
 
 	/* Don't go through full error handling during mount */
-	if (sb->s_flags & SB_BORN)
-		btrfs_handle_error(fs_info);
+	if (!(sb->s_flags & SB_BORN))
+		return;
+
+	if (sb_rdonly(sb))
+		return;
+
+	/* btrfs handle error by forcing the filesystem readonly */
+	sb->s_flags |= SB_RDONLY;
+	btrfs_info(fs_info, "forced readonly");
+	/*
+	 * Note that a running device replace operation is not canceled here
+	 * although there is no way to update the progress. It would add the
+	 * risk of a deadlock, therefore the canceling is omitted. The only
+	 * penalty is that some I/O remains active until the procedure
+	 * completes. The next time when the filesystem is mounted writeable
+	 * again, the device replace operation continues.
+	 */
 }
 
 #ifdef CONFIG_PRINTK