Add sync and transaction ioctl defs

btrfsctl -c forces a single FS sync

The transaction ioctls are unsafe for general use because they can lead
to deadlocks if the application is not very careful.  But, ceph is
experimenting with btrfs as a backing store, and these ioctls are required
for testing.

1 files changed, 3 insertions, 0 deletions

diff --git a/btrfsctl.c b/btrfsctl.c
index e90c6fc5..7e7e79b5 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -51,6 +51,7 @@ void print_usage(void)
 	printf("\t-r [+-]size[gkm] resize the FS\n");
 	printf("\t-A device scans the device for a Btrfs filesystem\n");
 	printf("\t-a scans all devices for Btrfs filesystems\n");
+	printf("\t-c forces a single FS sync\n");
 	exit(1);
 }
 
@@ -115,6 +116,8 @@ int main(int ac, char **av)
 				exit(1);
 			}
 			command = BTRFS_IOC_RESIZE;
+		} else if (strcmp(av[i], "-c") == 0) {
+			command = BTRFS_IOC_SYNC;
 		}
 	}
 	if (command == 0) {