btrfs: update sprout seed pointer when seed fs is relinquished

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

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 361a66e..27a14f1 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1848,6 +1848,27 @@ void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
        }
 
        call_rcu(&srcdev->rcu, free_device);
+
+       /*
+        * unless fs_devices is seed fs, num_devices shouldn't go
+        * zero
+        */
+       BUG_ON(!fs_devices->num_devices && !fs_devices->seeding);
+
+       /* if this is no devs we rather delete the fs_devices */
+       if (!fs_devices->num_devices) {
+               struct btrfs_fs_devices *tmp_fs_devices;
+
+               tmp_fs_devices = fs_info->fs_devices;
+               while (tmp_fs_devices) {
+                       if (tmp_fs_devices->seed == fs_devices) {
+                               tmp_fs_devices->seed = fs_devices->seed;
+                               break;
+                       }
+                       tmp_fs_devices = tmp_fs_devices->seed;
+               }
+               fs_devices->seed = NULL;
+       }
 }
 
 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,