--- drivers/md/md.c

+++ drivers/md/md.c

@@ -2011,12 +2011,18 @@ repeat:

if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */

/* .. if the array isn't clean, an 'even' event must also go

* to spares. */

- if ((mddev->events&1)==0)

+ if ((mddev->events&1)==0) {

nospares = 0;

+ sync_req = 2; /* force a second update to get the

+ * even/odd in sync */

+ }

} else {

/* otherwise an 'odd' event must go to spares */

- if ((mddev->events&1))

+ if ((mddev->events&1)) {

nospares = 0;

+ sync_req = 2; /* force a second update to get the

+ * even/odd in sync */

+ }

}

}

@@ -5328,6 +5334,7 @@ static int md_ioctl(struct block_device

int err = 0;

void __user *argp = (void __user *)arg;

mddev_t *mddev = NULL;

+ int ro;

if (!capable(CAP_SYS_ADMIN))

return -EACCES;

@@ -5463,6 +5470,34 @@ static int md_ioctl(struct block_device

err = do_md_stop(mddev, 1, 1);

goto done_unlock;

+ case BLKROSET:

+ if (get_user(ro, (int __user *)(arg))) {

+ err = -EFAULT;

+ goto done_unlock;

+ }

+ err = -EINVAL;

+

+ /* if the bdev is going readonly the value of mddev->ro

+ * does not matter, no writes are coming

+ */

+ if (ro)

+ goto done_unlock;

+

+ /* are we are already prepared for writes? */

+ if (mddev->ro != 1)

+ goto done_unlock;

+

+ /* transitioning to readauto need only happen for

+ * arrays that call md_write_start

+ */

+ if (mddev->pers) {

+ err = restart_array(mddev);

+ if (err == 0) {

+ mddev->ro = 2;

+ set_disk_ro(mddev->gendisk, 0);

+ }

+ }

+ goto done_unlock;

}

/*