btrfs: use the new bit BTRFS_FS_TREE_MOD_LOG_USERS at btrfs_free_tree_block()

Instead of exposing implementation details of the tree mod log to check
if there are active tree mod log users at btrfs_free_tree_block(), use
the new bit BTRFS_FS_TREE_MOD_LOG_USERS for fs_info->flags instead. This
way extent-tree.c does not need to known about any of the internals of
the tree mod log and avoids taking a lock unnecessarily as well.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2482b26b19714acf44a0f3fdfc24599cb82f54d0..7a28314189b4a3c0e05aeb14990adcbc33c3d686 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3342,11 +3342,9 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
                 * find a node pointing to this leaf and record operations that
                 * point to this leaf.
                 */
-               if (btrfs_header_level(buf) == 0) {
-                       read_lock(&fs_info->tree_mod_log_lock);
-                       must_pin = !list_empty(&fs_info->tree_mod_seq_list);
-                       read_unlock(&fs_info->tree_mod_log_lock);
-               }
+               if (btrfs_header_level(buf) == 0 &&
+                   test_bit(BTRFS_FS_TREE_MOD_LOG_USERS, &fs_info->flags))
+                       must_pin = true;
 
                if (must_pin || btrfs_is_zoned(fs_info)) {
                        btrfs_redirty_list_add(trans->transaction, buf);