btrfs: drop incompat bit for raid1c34 after last block group is gone

When there are no raid1c3 or raid1c4 block groups left after balance
(either convert or with other filters applied), remove the incompat bit.
This is already done for RAID56, do the same for RAID1C34.

Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/block-group.c

@@ -828,27 +828,36 @@ static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
  *
  * - RAID56 - in case there's neither RAID5 nor RAID6 profile block group
  *            in the whole filesystem
+ *
+ * - RAID1C34 - same as above for RAID1C3 and RAID1C4 block groups
  */
 static void clear_incompat_bg_bits(struct btrfs_fs_info *fs_info, u64 flags)
 {
-	if (flags & BTRFS_BLOCK_GROUP_RAID56_MASK) {
+	bool found_raid56 = false;
+	bool found_raid1c34 = false;
+
+	if ((flags & BTRFS_BLOCK_GROUP_RAID56_MASK) ||
+	    (flags & BTRFS_BLOCK_GROUP_RAID1C3) ||
+	    (flags & BTRFS_BLOCK_GROUP_RAID1C4)) {
 		struct list_head *head = &fs_info->space_info;
 		struct btrfs_space_info *sinfo;
 
 		list_for_each_entry_rcu(sinfo, head, list) {
-			bool found = false;
-
 			down_read(&sinfo->groups_sem);
 			if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID5]))
-				found = true;
+				found_raid56 = true;
 			if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID6]))
-				found = true;
+				found_raid56 = true;
+			if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID1C3]))
+				found_raid1c34 = true;
+			if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID1C4]))
+				found_raid1c34 = true;
 			up_read(&sinfo->groups_sem);
-
-			if (found)
-				return;
 		}
-		btrfs_clear_fs_incompat(fs_info, RAID56);
+		if (found_raid56)
+			btrfs_clear_fs_incompat(fs_info, RAID56);
+		if (found_raid1c34)
+			btrfs_clear_fs_incompat(fs_info, RAID1C34);
 	}
 }