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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 <neilb@suse.com> Acked-by: Coly Li <colyli@suse.de> Signed-off-by: Shaohua Li <shli@fb.com>
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@ -1282,8 +1282,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
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unsigned long flags;
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const int op = bio_op(bio);
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const unsigned long do_sync = (bio->bi_opf & REQ_SYNC);
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const unsigned long do_flush_fua = (bio->bi_opf &
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(REQ_PREFLUSH | REQ_FUA));
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const unsigned long do_fua = (bio->bi_opf & REQ_FUA);
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struct md_rdev *blocked_rdev;
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struct blk_plug_cb *cb;
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struct raid1_plug_cb *plug = NULL;
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@ -1509,7 +1508,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
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conf->mirrors[i].rdev->data_offset);
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mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
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mbio->bi_end_io = raid1_end_write_request;
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bio_set_op_attrs(mbio, op, do_flush_fua | do_sync);
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bio_set_op_attrs(mbio, op, do_fua | do_sync);
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if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) &&
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!test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) &&
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conf->raid_disks - mddev->degraded > 1)
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@ -1565,6 +1564,11 @@ static void raid1_make_request(struct mddev *mddev, struct bio *bio)
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struct bio *split;
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sector_t sectors;
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if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
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md_flush_request(mddev, bio);
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return;
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}
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/* if bio exceeds barrier unit boundary, split it */
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do {
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sectors = align_to_barrier_unit_end(
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