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authorChristoph Hellwig <hch@lst.de>2024-03-03 07:01:43 -0700
committerSong Liu <song@kernel.org>2024-03-06 08:59:53 -0800
commite305fce1883128a9468efe1876a057df48a261d6 (patch)
treedfc4adba4432e5d383a607bfb11bd90c38490827 /drivers/md/md.c
parent176df894d7974166c65d0cce3b3b019678f9e698 (diff)
md: add queue limit helpers
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
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2d93ea127b82..7c9fb7dcf0d4 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -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);