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block: use queue_limits_commit_update in queue_discard_max_store 

Convert queue_discard_max_store to use queue_limits_commit_update to
check and update the max_discard_sectors limit and freeze the queue
before doing so to ensure we don't have requests in flight while
changing the limits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240213073425.1621680-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-02-13 08:34:17 +01:00 committed by Jens Axboe
parent 4f563a6473
commit ff956a3be9
1 changed files with 10 additions and 3 deletions
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13
block/blk-sysfs.c
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@ -175,7 +175,9 @@ static ssize_t queue_discard_max_store(struct request_queue *q,
const char *page, size_t count)
{
unsigned long max_discard_bytes;
struct queue_limits lim;
ssize_t ret;
int err;
ret = queue_var_store(&max_discard_bytes, page, count);
if (ret < 0)
@ -187,9 +189,14 @@ static ssize_t queue_discard_max_store(struct request_queue *q,
if ((max_discard_bytes >> SECTOR_SHIFT) > UINT_MAX)
return -EINVAL;
q->limits.max_user_discard_sectors = max_discard_bytes >> SECTOR_SHIFT;
q->limits.max_discard_sectors = min(q->limits.max_hw_discard_sectors,
q->limits.max_user_discard_sectors);
blk_mq_freeze_queue(q);
lim = queue_limits_start_update(q);
lim.max_user_discard_sectors = max_discard_bytes >> SECTOR_SHIFT;
err = queue_limits_commit_update(q, &lim);
blk_mq_unfreeze_queue(q);
if (err)
return err;
return ret;
}