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md/raid1,raid10: strip REQ_NOWAIT from member bios

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RAID layers don't implement proper non-blocking semantics for
REQ_NOWAIT, making the flag potentially misleading when propagated
to member disks.

This patch clear REQ_NOWAIT from cloned bios in raid1/raid10. Retain
original bio's REQ_NOWAIT flag for upper layer error handling.

Maybe we can implement non-blocking I/O handling mechanisms within
RAID in future work.

Fixes: 9f346f7d4e ("md/raid1,raid10: don't handle IO error for
REQ_RAHEAD and REQ_NOWAIT")
Signed-off-by: Zheng Qixing <zhengqixing@huawei.com>
Link: https://lore.kernel.org/linux-raid/20250702102341.1969154-1-zhengqixing@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
This commit is contained in:
Zheng Qixing 2025-07-02 18:23:41 +08:00 committed by Yu Kuai
parent 43806c3d5b
commit 5fa31c4992
2 changed files with 4 additions and 1 deletions
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3
drivers/md/raid1.c
View File

@ -1399,7 +1399,7 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio,
}
read_bio = bio_alloc_clone(mirror->rdev->bdev, bio, gfp,
&mddev->bio_set);
read_bio->bi_opf &= ~REQ_NOWAIT;
r1_bio->bios[rdisk] = read_bio;
read_bio->bi_iter.bi_sector = r1_bio->sector +
@ -1649,6 +1649,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
wait_for_serialization(rdev, r1_bio);
}
mbio->bi_opf &= ~REQ_NOWAIT;
r1_bio->bios[i] = mbio;
mbio->bi_iter.bi_sector = (r1_bio->sector + rdev->data_offset);

2
drivers/md/raid10.c
View File

@ -1224,6 +1224,7 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
r10_bio->master_bio = bio;
}
read_bio = bio_alloc_clone(rdev->bdev, bio, gfp, &mddev->bio_set);
read_bio->bi_opf &= ~REQ_NOWAIT;
r10_bio->devs[slot].bio = read_bio;
r10_bio->devs[slot].rdev = rdev;
@ -1259,6 +1260,7 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
conf->mirrors[devnum].rdev;
mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO, &mddev->bio_set);
mbio->bi_opf &= ~REQ_NOWAIT;
if (replacement)
r10_bio->devs[n_copy].repl_bio = mbio;
else