Commit e305fce1 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Song Liu
Browse files

md: add queue limit helpers 



Add a few helpers that wrap the block queue limits API for use in MD.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed--by: default avatarSong Liu <song@kernel.org>
Tested-by: default avatarSong Liu <song@kernel.org>
Signed-off-by: default avatarSong Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240303140150.5435-5-hch@lst.de
parent 176df894

drivers/md/md.c

+45 −0
Original line number Diff line number Diff line
@@ -5751,6 +5751,51 @@ static const struct kobj_type md_ktype = { 


int mdp_major = 0;



/* stack the limit for all rdevs into lim */

void mddev_stack_rdev_limits(struct mddev *mddev, struct queue_limits *lim)

{

	struct md_rdev *rdev;



	rdev_for_each(rdev, mddev) {

		queue_limits_stack_bdev(lim, rdev->bdev, rdev->data_offset,

					mddev->gendisk->disk_name);

	}

}

EXPORT_SYMBOL_GPL(mddev_stack_rdev_limits);



/* apply the extra stacking limits from a new rdev into mddev */

int mddev_stack_new_rdev(struct mddev *mddev, struct md_rdev *rdev)

{

	struct queue_limits lim;



	if (mddev_is_dm(mddev))

		return 0;



	lim = queue_limits_start_update(mddev->queue);

	queue_limits_stack_bdev(&lim, rdev->bdev, rdev->data_offset,

				mddev->gendisk->disk_name);

	return queue_limits_commit_update(mddev->queue, &lim);

}

EXPORT_SYMBOL_GPL(mddev_stack_new_rdev);



/* update the optimal I/O size after a reshape */

void mddev_update_io_opt(struct mddev *mddev, unsigned int nr_stripes)

{

	struct queue_limits lim;



	if (mddev_is_dm(mddev))

		return;



	/* don't bother updating io_opt if we can't suspend the array */

	if (mddev_suspend(mddev, false) < 0)

		return;

	lim = queue_limits_start_update(mddev->gendisk->queue);

	lim.io_opt = lim.io_min * nr_stripes;

	queue_limits_commit_update(mddev->gendisk->queue, &lim);

	mddev_resume(mddev);

}

EXPORT_SYMBOL_GPL(mddev_update_io_opt);



static void mddev_delayed_delete(struct work_struct *ws)

{

	struct mddev *mddev = container_of(ws, struct mddev, del_work);

drivers/md/md.h

+3 −0
Original line number Diff line number Diff line
@@ -908,6 +908,9 @@ void md_autostart_arrays(int part); 
int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info);

int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info);

int do_md_run(struct mddev *mddev);

void mddev_stack_rdev_limits(struct mddev *mddev, struct queue_limits *lim);

int mddev_stack_new_rdev(struct mddev *mddev, struct md_rdev *rdev);

void mddev_update_io_opt(struct mddev *mddev, unsigned int nr_stripes);



extern const struct block_device_operations md_fops;