From aff8da09f2381f0869faaf6637b0d892a3ee99ed Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Tue, 21 Feb 2017 10:56:19 -0800 Subject: [PATCH] md/raid1: handle flush request correctly I got a warning triggered in align_to_barrier_unit_end. It's a flush request so sectors == 0. The flush request happens to work well without the new barrier patch, but we'd better handle it explictly. Cc: NeilBrown Acked-by: Coly Li Signed-off-by: Shaohua Li --- drivers/md/raid1.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 2e5e4805cbe1..8901f0c8c775 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1282,8 +1282,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio) unsigned long flags; const int op = bio_op(bio); const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); - const unsigned long do_flush_fua = (bio->bi_opf & - (REQ_PREFLUSH | REQ_FUA)); + const unsigned long do_fua = (bio->bi_opf & REQ_FUA); struct md_rdev *blocked_rdev; struct blk_plug_cb *cb; struct raid1_plug_cb *plug = NULL; @@ -1509,7 +1508,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio) conf->mirrors[i].rdev->data_offset); mbio->bi_bdev = conf->mirrors[i].rdev->bdev; mbio->bi_end_io = raid1_end_write_request; - bio_set_op_attrs(mbio, op, do_flush_fua | do_sync); + bio_set_op_attrs(mbio, op, do_fua | do_sync); if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && conf->raid_disks - mddev->degraded > 1) @@ -1565,6 +1564,11 @@ static void raid1_make_request(struct mddev *mddev, struct bio *bio) struct bio *split; sector_t sectors; + if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { + md_flush_request(mddev, bio); + return; + } + /* if bio exceeds barrier unit boundary, split it */ do { sectors = align_to_barrier_unit_end( -- 2.45.2