Btrfs: mark delayed refs as for cow

[karo-tx-linux.git] / fs / btrfs / transaction.c

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 6a0574e923bc6a33b4965976328222dcf0a61cb0..a2bfedcbcabcb0f19b042d1cba1b5ede91e640bb 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -785,6 +785,10 @@ static noinline int commit_fs_roots(struct btrfs_trans_handle *trans,
 
                        btrfs_save_ino_cache(root, trans);
 
+                       /* see comments in should_cow_block() */
+                       root->force_cow = 0;
+                       smp_wmb();
+
                        if (root->commit_root != root->node) {
                                mutex_lock(&root->fs_commit_mutex);
                                switch_commit_root(root);
@@ -947,6 +951,10 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
        btrfs_tree_unlock(old);
        free_extent_buffer(old);
 
+       /* see comments in should_cow_block() */
+       root->force_cow = 1;
+       smp_wmb();
+
        btrfs_set_root_node(new_root_item, tmp);
        /* record when the snapshot was created in key.offset */
        key.offset = trans->transid;
@@ -1385,9 +1393,9 @@ int btrfs_clean_old_snapshots(struct btrfs_root *root)
 
                if (btrfs_header_backref_rev(root->node) <
                    BTRFS_MIXED_BACKREF_REV)
-                       btrfs_drop_snapshot(root, NULL, 0);
+                       btrfs_drop_snapshot(root, NULL, 0, 0);
                else
-                       btrfs_drop_snapshot(root, NULL, 1);
+                       btrfs_drop_snapshot(root, NULL, 1, 0);
        }
        return 0;
 }