raid5: allow arbitrary max_hw_sectors
authorShaohua Li <shli@fb.com>
Thu, 8 Sep 2016 17:49:06 +0000 (10:49 -0700)
committerShaohua Li <shli@fb.com>
Wed, 21 Sep 2016 16:09:44 +0000 (09:09 -0700)
raid5 will split bio to proper size internally, there is no point to use
underlayer disk's max_hw_sectors. In my qemu system, without the change,
the raid5 only receives 128k size bio, which reduces the chance of bio
merge sending to underlayer disks.

Signed-off-by: Shaohua Li <shli@fb.com>
drivers/md/raid5.c

index ee7fc37..5883ef0 100644 (file)
@@ -7066,6 +7066,8 @@ static int raid5_run(struct mddev *mddev)
                else
                        queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD,
                                                mddev->queue);
+
+               blk_queue_max_hw_sectors(mddev->queue, UINT_MAX);
        }
 
        if (journal_dev) {