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md: add queue limit helpers

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed--by: Song Liu <song@kernel.org>
Tested-by: Song Liu <song@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240303140150.5435-5-hch@lst.de
This commit is contained in:
Christoph Hellwig 2024-03-03 07:01:43 -07:00 committed by Song Liu
parent 176df894d7
commit e305fce188
2 changed files with 48 additions and 0 deletions
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45
drivers/md/md.c
View File

@ -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);

3
drivers/md/md.h
View File

@ -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;