This is a note to let you know that I've just added the patch titled
block: Fix where bio IO priority gets set
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
block-fix-where-bio-io-priority-gets-set.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 659df859dc84a4b0db91d177c7e90c4ec7bf663c
Author: Hongyu Jin <hongyu.jin@xxxxxxxxxx>
Date: Tue Jan 30 15:26:34 2024 -0500
block: Fix where bio IO priority gets set
[ Upstream commit f3c89983cb4fc00be64eb0d5cbcfcdf2cacb965e ]
Commit 82b74cac2849 ("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: a78418e6a04c ("block: Always initialize bio IO priority on submit")
Co-developed-by: Yibin Ding <yibin.ding@xxxxxxxxxx>
Signed-off-by: Yibin Ding <yibin.ding@xxxxxxxxxx>
Signed-off-by: Hongyu Jin <hongyu.jin@xxxxxxxxxx>
Reviewed-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Reviewed-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
[snitzer: revised commit header]
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240130202638.62600-2-snitzer@xxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/block/blk-core.c b/block/blk-core.c
index bf058cea9016a..4f25d2c4bc705 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -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;
@@ -819,6 +820,14 @@ void submit_bio_noacct(struct bio *bio)
}
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
@@ -841,6 +850,7 @@ 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);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7cc315527a44c..733d72f4d1cc9 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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);
@@ -2956,14 +2955,6 @@ static bool blk_mq_can_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.
@@ -2988,7 +2979,6 @@ 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);
