raid5: allow arbitrary max_hw_sectors

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>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ee7fc37017007a2d6cf4b440f95063535d928522..5883ef0d95bf9a6f17eadb243fc40d61cc9909ed 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -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) {