[PATCH 07/15] block: use queue_limits_commit_update in queue_discard_max_store

Christoph Hellwig
2024-01-22T17:37:12Z

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/blk-sysfs.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 54e10604ddb1dd..8c8f69d8ba48ee 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -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)
@@ -187,10 +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_not_zero(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;
}

--
2.39.2