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block: Fix where bio IO priority gets set 

Commit 82b74cac28 ("blk-ioprio: Convert from rqos policy to direct
call") pushed setting bio I/O priority down into blk_mq_submit_bio()
-- which is too low within block core's submit_bio() because it
skips setting I/O priority for block drivers that implement
fops->submit_bio() (e.g. DM, MD, etc).

Fix this by moving bio_set_ioprio() up from blk-mq.c to blk-core.c and
call it from submit_bio().  This ensures all block drivers call
bio_set_ioprio() during initial bio submission.

Fixes: a78418e6a0 ("block: Always initialize bio IO priority on submit")
Co-developed-by: Yibin Ding <yibin.ding@unisoc.com>
Signed-off-by: Yibin Ding <yibin.ding@unisoc.com>
Signed-off-by: Hongyu Jin <hongyu.jin@unisoc.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
[snitzer: revised commit header]
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240130202638.62600-2-snitzer@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hongyu Jin 2024-01-30 15:26:34 -05:00 committed by Jens Axboe
parent 373581643d
commit f3c89983cb
2 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
block/blk-core.c
View File

@ -49,6 +49,7 @@
#include "blk-pm.h"
#include "blk-cgroup.h"
#include "blk-throttle.h"
#include "blk-ioprio.h"
struct dentry *blk_debugfs_root;
@ -833,6 +834,14 @@ end_io:
}
EXPORT_SYMBOL(submit_bio_noacct);
static void bio_set_ioprio(struct bio *bio)
{
/* Nobody set ioprio so far? Initialize it based on task's nice value */
if (IOPRIO_PRIO_CLASS(bio->bi_ioprio) == IOPRIO_CLASS_NONE)
bio->bi_ioprio = get_current_ioprio();
blkcg_set_ioprio(bio);
}
/**
* submit_bio - submit a bio to the block device layer for I/O
* @bio: The &struct bio which describes the I/O
@ -855,6 +864,7 @@ void submit_bio(struct bio *bio)
count_vm_events(PGPGOUT, bio_sectors(bio));
}
bio_set_ioprio(bio);
submit_bio_noacct(bio);
}
EXPORT_SYMBOL(submit_bio);

10
block/blk-mq.c
View File

@ -40,7 +40,6 @@
#include "blk-stat.h"
#include "blk-mq-sched.h"
#include "blk-rq-qos.h"
#include "blk-ioprio.h"
static DEFINE_PER_CPU(struct llist_head, blk_cpu_done);
static DEFINE_PER_CPU(call_single_data_t, blk_cpu_csd);
@ -2944,14 +2943,6 @@ static bool blk_mq_use_cached_rq(struct request *rq, struct blk_plug *plug,
return true;
}
static void bio_set_ioprio(struct bio *bio)
{
/* Nobody set ioprio so far? Initialize it based on task's nice value */
if (IOPRIO_PRIO_CLASS(bio->bi_ioprio) == IOPRIO_CLASS_NONE)
bio->bi_ioprio = get_current_ioprio();
blkcg_set_ioprio(bio);
}
/**
* blk_mq_submit_bio - Create and send a request to block device.
* @bio: Bio pointer.
@ -2976,7 +2967,6 @@ void blk_mq_submit_bio(struct bio *bio)
blk_status_t ret;
bio = blk_queue_bounce(bio, q);
bio_set_ioprio(bio);
if (plug) {
rq = rq_list_peek(&plug->cached_rq);