btrfs: synchronize incompat feature bits with sysfs files

The files under /sys/fs/UUID/features get out of sync with the actual
incompat bits set for the filesystem if they change after mount (eg. the
LZO compression).

Synchronize the feature bits with the sysfs files representing them
right after we set/clear them.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c
index 393e36bd5845..94e887f5ec4e 100644
--- a/fs/btrfs/free-space-tree.c
+++ b/fs/btrfs/free-space-tree.c
@@ -23,6 +23,7 @@
 #include "locking.h"
 #include "free-space-tree.h"
 #include "transaction.h"
+#include "sysfs.h"
 
 static int __add_block_group_free_space(struct btrfs_trans_handle *trans,
                                         struct btrfs_fs_info *fs_info,
@@ -1169,6 +1170,9 @@ int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info)
         }
 
         btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE);
+        btrfs_sysfs_feature_update(fs_info,
+                BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE, FEAT_COMPAT_RO);
+
         fs_info->creating_free_space_tree = 0;
 
         ret = btrfs_commit_transaction(trans, tree_root);
@@ -1237,6 +1241,9 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
                 return PTR_ERR(trans);
 
         btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE);
+        btrfs_sysfs_feature_update(fs_info,
+                BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE, FEAT_COMPAT_RO);
+
         fs_info->free_space_root = NULL;
 
         ret = clear_free_space_tree(trans, free_space_root);