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 <bob.liu@xxxxxxxxxx>
---
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
