6.12-stable review patch. If anyone has any objections, please let me know.
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From: Zheng Qixing zhengqixing@huawei.com
commit 5fa31c49928139fa948f078b094d80f12ed83f5f upstream.
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: Harshit Mogalapalli harshit.m.mogalapalli@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/raid1.c | 3 ++- drivers/md/raid10.c | 2 ++ 2 files changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1392,7 +1392,7 @@ static void raid1_read_request(struct md } 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 + @@ -1613,6 +1613,7 @@ static void raid1_write_request(struct m 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); --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1218,6 +1218,7 @@ static void raid10_read_request(struct m 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; @@ -1248,6 +1249,7 @@ static void raid10_write_one_disk(struct 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