1 files changed, 30 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 862df2066e7a..f24ef9020323 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -10606,6 +10606,35 @@ static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
         write_sequnlock(&fs_info->profiles_lock);
 }
 
+/*
+ * Clear incompat bits for the following feature(s):
+ *
+ * - RAID56 - in case there's neither RAID5 nor RAID6 profile block group
+ *            in the whole filesystem
+ */
+static void clear_incompat_bg_bits(struct btrfs_fs_info *fs_info, u64 flags)
+{
+        if (flags & BTRFS_BLOCK_GROUP_RAID56_MASK) {
+                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;
+                        if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID6]))
+                                found = true;
+                        up_read(&sinfo->groups_sem);
+
+                        if (found)
+                                return;
+                }
+                btrfs_clear_fs_incompat(fs_info, RAID56);
+        }
+}
+
 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
                              u64 group_start, struct extent_map *em)
 {
@@ -10752,6 +10781,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
                 clear_avail_alloc_bits(fs_info, block_group->flags);
         }
         up_write(&block_group->space_info->groups_sem);
+        clear_incompat_bg_bits(fs_info, block_group->flags);
         if (kobj) {
                 kobject_del(kobj);
                 kobject_put(kobj);