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md/raid1-10: factor out a helper to add bio to plug 

The code in raid1 and raid10 is identical, prepare to limit the number
of plugged bios.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230529131106.2123367-3-yukuai1@huaweicloud.com
This commit is contained in:
Yu Kuai 2023-05-29 21:11:01 +08:00 committed by Song Liu
parent 010444623e
commit 5ec6ca140a
3 changed files with 18 additions and 21 deletions
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16
drivers/md/raid1-10.c
View File

@ -110,3 +110,19 @@ static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp,
size -= len;
} while (idx++ < RESYNC_PAGES && size > 0);
}
static inline bool raid1_add_bio_to_plug(struct mddev *mddev, struct bio *bio,
blk_plug_cb_fn unplug)
{
struct raid1_plug_cb *plug = NULL;
struct blk_plug_cb *cb = blk_check_plugged(unplug, mddev,
sizeof(*plug));
if (!cb)
return false;
plug = container_of(cb, struct raid1_plug_cb, cb);
bio_list_add(&plug->pending, bio);
return true;
}

12
drivers/md/raid1.c
View File

@ -1346,8 +1346,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
struct bitmap *bitmap = mddev->bitmap;
unsigned long flags;
struct md_rdev *blocked_rdev;
struct blk_plug_cb *cb;
struct raid1_plug_cb *plug = NULL;
int first_clone;
int max_sectors;
bool write_behind = false;
@ -1576,15 +1574,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
r1_bio->sector);
/* flush_pending_writes() needs access to the rdev so...*/
mbio->bi_bdev = (void *)rdev;
cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug));
if (cb)
plug = container_of(cb, struct raid1_plug_cb, cb);
else
plug = NULL;
if (plug) {
bio_list_add(&plug->pending, mbio);
} else {
if (!raid1_add_bio_to_plug(mddev, mbio, raid1_unplug)) {
spin_lock_irqsave(&conf->device_lock, flags);
bio_list_add(&conf->pending_bio_list, mbio);
spin_unlock_irqrestore(&conf->device_lock, flags);

11
drivers/md/raid10.c
View File

@ -1295,8 +1295,6 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
const blk_opf_t do_sync = bio->bi_opf & REQ_SYNC;
const blk_opf_t do_fua = bio->bi_opf & REQ_FUA;
unsigned long flags;
struct blk_plug_cb *cb;
struct raid1_plug_cb *plug = NULL;
struct r10conf *conf = mddev->private;
struct md_rdev *rdev;
int devnum = r10_bio->devs[n_copy].devnum;
@ -1336,14 +1334,7 @@ static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio,
atomic_inc(&r10_bio->remaining);
cb = blk_check_plugged(raid10_unplug, mddev, sizeof(*plug));
if (cb)
plug = container_of(cb, struct raid1_plug_cb, cb);
else
plug = NULL;
if (plug) {
bio_list_add(&plug->pending, mbio);
} else {
if (!raid1_add_bio_to_plug(mddev, mbio, raid10_unplug)) {
spin_lock_irqsave(&conf->device_lock, flags);
bio_list_add(&conf->pending_bio_list, mbio);
spin_unlock_irqrestore(&conf->device_lock, flags);