btrfs: add readonly flag

setting the readonly flag prevents writes in case an error is detected

Signed-off-by: Arne Jansen <sensille@gmx.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 1a638ceeead8..e5e0ee2cad4e 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -81,6 +81,7 @@ struct btrfs_scrub_progress {
                                          * Intermittent error. */
 };
 
+#define BTRFS_SCRUB_READONLY    1
 struct btrfs_ioctl_scrub_args {
         __u64 devid;                            /* in */
         __u64 start;                            /* in */