redonkable/alistair23-linux
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raid1: serialize the overlap write

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Before dispatch write bio, raid1 array which enables
serialize_policy need to check if overlap exists between
this bio and previous on-flying bios. If there is overlap,
then it has to wait until the collision is disappeared.

Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Guoqing Jiang 2019-12-23 10:48:58 +01:00 committed by Song Liu
parent de31ee9497
commit 69df9cfc70
1 changed files with 13 additions and 14 deletions
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27
drivers/md/raid1.c
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@ -430,6 +430,8 @@ static void raid1_end_write_request(struct bio *bio)
int mirror = find_bio_disk(r1_bio, bio);
struct md_rdev *rdev = conf->mirrors[mirror].rdev;
bool discard_error;
sector_t lo = r1_bio->sector;
sector_t hi = r1_bio->sector + r1_bio->sectors;
discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD;
@ -499,12 +501,8 @@ static void raid1_end_write_request(struct bio *bio)
}
if (behind) {
if (test_bit(CollisionCheck, &rdev->flags)) {
sector_t lo = r1_bio->sector;
sector_t hi = r1_bio->sector + r1_bio->sectors;
if (test_bit(CollisionCheck, &rdev->flags))
remove_serial(rdev, lo, hi);
}
if (test_bit(WriteMostly, &rdev->flags))
atomic_dec(&r1_bio->behind_remaining);
@ -527,7 +525,8 @@ static void raid1_end_write_request(struct bio *bio)
call_bio_endio(r1_bio);
}
}
}
} else if (rdev->mddev->serialize_policy)
remove_serial(rdev, lo, hi);
if (r1_bio->bios[mirror] == NULL)
rdev_dec_pending(rdev, conf->mddev);
@ -1337,6 +1336,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
struct raid1_plug_cb *plug = NULL;
int first_clone;
int max_sectors;
sector_t lo, hi;
if (mddev_is_clustered(mddev) &&
md_cluster_ops->area_resyncing(mddev, WRITE,
@ -1364,6 +1364,8 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
r1_bio = alloc_r1bio(mddev, bio);
r1_bio->sectors = max_write_sectors;
lo = r1_bio->sector;
hi = r1_bio->sector + r1_bio->sectors;
if (conf->pending_count >= max_queued_requests) {
md_wakeup_thread(mddev->thread);
@ -1479,6 +1481,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
for (i = 0; i < disks; i++) {
struct bio *mbio = NULL;
struct md_rdev *rdev = conf->mirrors[i].rdev;
if (!r1_bio->bios[i])
continue;
@ -1506,19 +1509,15 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set);
if (r1_bio->behind_master_bio) {
struct md_rdev *rdev = conf->mirrors[i].rdev;
if (test_bit(CollisionCheck, &rdev->flags)) {
sector_t lo = r1_bio->sector;
sector_t hi = r1_bio->sector + r1_bio->sectors;
if (test_bit(CollisionCheck, &rdev->flags))
wait_event(rdev->serial_io_wait,
check_and_add_serial(rdev, lo, hi)
== 0);
}
if (test_bit(WriteMostly, &rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
}
} else if (mddev->serialize_policy)
wait_event(rdev->serial_io_wait,
check_and_add_serial(rdev, lo, hi) == 0);
r1_bio->bios[i] = mbio;