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-rw-r--r--fs/btrfs/volumes.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index fef46c0dbf19..5dd4ad775e5d 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -299,6 +299,10 @@ struct btrfs_fs_devices {
* - When the BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag is set:
* fs_devices->fsid == sb->fsid
* fs_devices->metadata_uuid == sb->metadata_uuid
+ *
+ * - When in-memory fs_devices->temp_fsid is true
+ * fs_devices->fsid = random
+ * fs_devices->metadata_uuid == sb->fsid
*/
u8 metadata_uuid[BTRFS_FSID_SIZE];