Btrfs: Let some locks go during defrag and snapshot dropping

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 338a7199363b..88b0752550b6 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -354,6 +354,7 @@ int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info)
                                 mutex_unlock(&info->fs_mutex);
 
                                 btrfs_btree_balance_dirty(root);
+                                cond_resched();
 
                                 mutex_lock(&info->fs_mutex);
                                 trans = btrfs_start_transaction(tree_root, 1);
@@ -394,6 +395,12 @@ static int drop_dirty_roots(struct btrfs_root *tree_root,
                                 ret = err;
                         ret = btrfs_end_transaction(trans, tree_root);
                         BUG_ON(ret);
+                        mutex_unlock(&tree_root->fs_info->fs_mutex);
+
+                        btrfs_btree_balance_dirty(tree_root);
+                        schedule();
+
+                        mutex_lock(&tree_root->fs_info->fs_mutex);
                 }
                 BUG_ON(ret);
                 ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key);
@@ -406,6 +413,7 @@ static int drop_dirty_roots(struct btrfs_root *tree_root,
                 kfree(dirty);
                 mutex_unlock(&tree_root->fs_info->fs_mutex);
                 btrfs_btree_balance_dirty(tree_root);
+                schedule();
         }
         return ret;
 }