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md: raid456 add nowait support

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Returns EAGAIN in case the raid456 driver would block waiting for reshape.

Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Vishal Verma <vverma@digitalocean.com>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Vishal Verma 2021-12-21 20:06:22 +00:00 committed by Song Liu
parent c9aa889b03
commit bf2c411bb1
1 changed files with 15 additions and 0 deletions
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15
drivers/md/raid5.c
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@ -5686,6 +5686,10 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
struct stripe_head *sh;
int stripe_sectors;
/* We need to handle this when io_uring supports discard/trim */
if (WARN_ON_ONCE(bi->bi_opf & REQ_NOWAIT))
return;
if (mddev->reshape_position != MaxSector)
/* Skip discard while reshape is happening */
return;
@ -5819,6 +5823,17 @@ static bool raid5_make_request(struct mddev *mddev, struct bio * bi)
last_sector = bio_end_sector(bi);
bi->bi_next = NULL;
/* Bail out if conflicts with reshape and REQ_NOWAIT is set */
if ((bi->bi_opf & REQ_NOWAIT) &&
(conf->reshape_progress != MaxSector) &&
(mddev->reshape_backwards
? (logical_sector > conf->reshape_progress && logical_sector <= conf->reshape_safe)
: (logical_sector >= conf->reshape_safe && logical_sector < conf->reshape_progress))) {
bio_wouldblock_error(bi);
if (rw == WRITE)
md_write_end(mddev);
return true;
}
md_account_bio(mddev, &bi);
prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
for (; logical_sector < last_sector; logical_sector += RAID5_STRIPE_SECTORS(conf)) {