diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 7 |
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 */ |