1 files changed, 12 insertions, 2 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d8da538d01fb..83bffbea7d97 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4079,9 +4079,19 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig,
                  * We need to wait for the async pages to actually start before
                  * we do anything.
                  */
-                wait_event(root->fs_info->async_submit_wait,
-                           !atomic_read(&root->fs_info->async_delalloc_pages));
+                max_reclaim = atomic_read(&root->fs_info->async_delalloc_pages);
+                if (!max_reclaim)
+                        goto skip_async;
+
+                if (max_reclaim <= nr_pages)
+                        max_reclaim = 0;
+                else
+                        max_reclaim -= nr_pages;
 
+                wait_event(root->fs_info->async_submit_wait,
+                           atomic_read(&root->fs_info->async_delalloc_pages) <=
+                           (int)max_reclaim);
+skip_async:
                 if (!trans)
                         flush = BTRFS_RESERVE_FLUSH_ALL;
                 else