Btrfs: Catch missed bios in the async bio submission thread

[deliverable/linux.git] / fs / btrfs / volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index fd0bedb07a6405d78f66ef7de63965b17d5617d3..bcd14ebccae16e751e67a73cf79c2dfbbf0db465 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -154,6 +154,7 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
 loop:
        spin_lock(&device->io_lock);
 
+loop_lock:
        /* take all the bios off the list at once and process them
         * later on (without the lock held).  But, remember the
         * tail and other pointers so the bios can be properly reinserted
@@ -203,7 +204,7 @@ loop:
                 * is now congested.  Back off and let other work structs
                 * run instead
                 */
-               if (pending && bdi_write_congested(bdi) &&
+               if (pending && bdi_write_congested(bdi) && num_run > 16 &&
                    fs_info->fs_devices->open_devices > 1) {
                        struct bio *old_head;
 
@@ -215,7 +216,8 @@ loop:
                                tail->bi_next = old_head;
                        else
                                device->pending_bio_tail = tail;
-                       device->running_pending = 0;
+
+                       device->running_pending = 1;
 
                        spin_unlock(&device->io_lock);
                        btrfs_requeue_work(&device->work);
@@ -224,6 +226,11 @@ loop:
        }
        if (again)
                goto loop;
+
+       spin_lock(&device->io_lock);
+       if (device->pending_bios)
+               goto loop_lock;
+       spin_unlock(&device->io_lock);
 done:
        return 0;
 }