In stack layer case, the mirror of upper layer device is the sum of mirrors of all lower layer devices.
Signed-off-by: Bob Liu <[email protected]> --- drivers/md/raid1.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 1e5a51f22332..0de28714e9b5 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -3050,6 +3050,7 @@ static int raid1_run(struct mddev *mddev) struct md_rdev *rdev; int ret; bool discard_supported = false; + unsigned long mirrors = 0; if (mddev->level != 1) { pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", @@ -3084,11 +3085,15 @@ static int raid1_run(struct mddev *mddev) rdev_for_each(rdev, mddev) { if (!mddev->gendisk) continue; + mirrors += blk_queue_get_mirrors(bdev_get_queue(rdev->bdev)); disk_stack_limits(mddev->gendisk, rdev->bdev, rdev->data_offset << 9); if (blk_queue_discard(bdev_get_queue(rdev->bdev))) discard_supported = true; } + if (mddev->queue) + if (!blk_queue_set_mirrors(mddev->queue, mirrors)) + return -EINVAL; mddev->degraded = 0; for (i=0; i < conf->raid_disks; i++) -- 2.17.1
