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| author | Vishal Verma <vverma@digitalocean.com> | 2021-12-21 20:06:22 +0000 |
|---|---|---|
| committer | Song Liu <song@kernel.org> | 2022-01-06 08:37:02 -0800 |
| commit | bf2c411bb1cfc45f73eb6c55b5755bcb990063ae (patch) | |
| tree | 1a9a8189222bbd8f82f0436856c18dc5f6432b63 /drivers/md | |
| parent | c9aa889b035fca4598ae985a0f0c76ebbb547ad2 (diff) | |
| download | lwn-bf2c411bb1cfc45f73eb6c55b5755bcb990063ae.tar.gz lwn-bf2c411bb1cfc45f73eb6c55b5755bcb990063ae.zip | |
md: raid456 add nowait support
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>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 1240a5c16af8..beb544be9058 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -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)) { |