6.15-stable review patch. If anyone has any objections, please let me know.
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From: Zheng Qixing zhengqixing@huawei.com
[ Upstream commit 5fa31c49928139fa948f078b094d80f12ed83f5f ]
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: 9f346f7d4ea7 ("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@huaw... Signed-off-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/raid1.c | 3 ++- drivers/md/raid10.c | 2 ++ 2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 80efe737010b5..3d99a4e38e1c6 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -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); diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 0443a479809f9..6a55374a6ba37 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -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