btrfs: replace seed device followed by unmount causes kernel WARNING

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

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 096b4a3dc5a9ad51777eaecbbbff5460ff68128e..361a66e2c179699104c2b6e9fabf7dc557f15353 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1819,7 +1819,13 @@ void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
 
        WARN_ON(!mutex_is_locked(&fs_info->fs_devices->device_list_mutex));
 
-       fs_devices = fs_info->fs_devices;
+       /*
+        * in case of fs with no seed, srcdev->fs_devices will point
+        * to fs_devices of fs_info. However when the dev being replaced is
+        * a seed dev it will point to the seed's local fs_devices. In short
+        * srcdev will have its correct fs_devices in both the cases.
+        */
+       fs_devices = srcdev->fs_devices;
 
        list_del_rcu(&srcdev->dev_list);
        list_del_rcu(&srcdev->dev_alloc_list);