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-rw-r--r--fs/btrfs/volumes.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 3c1f7310421..5139a833f72 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -96,7 +96,12 @@ struct btrfs_fs_devices {
u64 rw_devices;
u64 total_rw_bytes;
struct block_device *latest_bdev;
- /* all of the devices in the FS */
+
+ /* all of the devices in the FS, protected by a mutex
+ * so we can safely walk it to write out the supers without
+ * worrying about add/remove by the multi-device code
+ */
+ struct mutex device_list_mutex;
struct list_head devices;
/* devices not currently being allocated */