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block: rate-limit capacity change info log

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commit 3179a5f7f86bcc3acd5d6fb2a29f891ef5615852 upstream.

loop devices under heavy stress-ng loop streessor can trigger many
capacity change events in a short time. Each event prints an info
message from set_capacity_and_notify(), flooding the console and
contributing to soft lockups on slow consoles.

Switch the printk in set_capacity_and_notify() to
pr_info_ratelimited() so frequent capacity changes do not spam
the log while still reporting occasional changes.

Cc: stable@vger.kernel.org
Signed-off-by: Li Chen <chenl311@chinatelecom.cn>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Li Chen 2025-11-17 13:34:07 +08:00 committed by Greg Kroah-Hartman
parent 3c35608d65
commit 2f945c9892
1 changed files with 1 additions and 1 deletions
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2
block/genhd.c
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@ -83,7 +83,7 @@ bool set_capacity_and_notify(struct gendisk *disk, sector_t size)
(disk->flags & GENHD_FL_HIDDEN))
return false;
pr_info("%s: detected capacity change from %lld to %lld\n",
pr_info_ratelimited("%s: detected capacity change from %lld to %lld\n",
disk->disk_name, capacity, size);
/*