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drbd: use blk_queue_max_discard_sectors helper 

We currently only set q->limits.max_discard_sectors, but that is not
enough. Another field, max_hw_discard_sectors, was introduced in
commit 0034af0365 ("block: make /sys/block/<dev>/queue/discard_max_bytes
writeable").

The difference is that max_discard_sectors can be changed from user
space via sysfs, while max_hw_discard_sectors is the "hardware" upper
limit.

So use this helper, which sets both.

This is also a fixup for commit 998e9cbcd6 ("drbd: cleanup
decide_on_discard_support"): if discards are not supported, that does
not necessarily mean we also want to disable write_zeroes.

Fixes: 998e9cbcd6 ("drbd: cleanup decide_on_discard_support")
Reviewed-by: Joel Colledge <joel.colledge@linbit.com>
Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20221109133453.51652-2-christoph.boehmwalder@linbit.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Böhmwalder 2022-11-09 14:34:51 +01:00 committed by Jens Axboe
parent 6d4338cb40
commit 258bea6388
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/block/drbd/drbd_nl.c
View File

@ -1210,6 +1210,7 @@ static void decide_on_discard_support(struct drbd_device *device,
struct drbd_connection *connection =
first_peer_device(device)->connection;
struct request_queue *q = device->rq_queue;
unsigned int max_discard_sectors;
if (bdev && !bdev_max_discard_sectors(bdev->backing_bdev))
goto not_supported;
@ -1230,15 +1231,14 @@ static void decide_on_discard_support(struct drbd_device *device,
* topology on all peers.
*/
blk_queue_discard_granularity(q, 512);
q->limits.max_discard_sectors = drbd_max_discard_sectors(connection);
q->limits.max_write_zeroes_sectors =
drbd_max_discard_sectors(connection);
max_discard_sectors = drbd_max_discard_sectors(connection);
blk_queue_max_discard_sectors(q, max_discard_sectors);
blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
return;
not_supported:
blk_queue_discard_granularity(q, 0);
q->limits.max_discard_sectors = 0;
q->limits.max_write_zeroes_sectors = 0;
blk_queue_max_discard_sectors(q, 0);
}
static void fixup_write_zeroes(struct drbd_device *device, struct request_queue *q)