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raid10: refactor common wait code from regular read/write request 

Both raid10_read_request and raid10_write_request share
the same code at the beginning of them, so introduce
regular_request_wait to clean up code, and call it in
both request functions.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
hifive-unleashed-5.1
Guoqing Jiang 2018-12-07 18:24:21 +08:00 committed by Shaohua Li
parent 37b22c2894
commit caea3c47ad
1 changed files with 25 additions and 47 deletions
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72
drivers/md/raid10.c
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@ -1124,6 +1124,29 @@ static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
kfree(plug);
}
/*
* 1. Register the new request and wait if the reconstruction thread has put
* up a bar for new requests. Continue immediately if no resync is active
* currently.
* 2. If IO spans the reshape position. Need to wait for reshape to pass.
*/
static void regular_request_wait(struct mddev *mddev, struct r10conf *conf,
struct bio *bio, sector_t sectors)
{
wait_barrier(conf);
while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
bio->bi_iter.bi_sector < conf->reshape_progress &&
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
raid10_log(conf->mddev, "wait reshape");
allow_barrier(conf);
wait_event(conf->wait_barrier,
conf->reshape_progress <= bio->bi_iter.bi_sector ||
conf->reshape_progress >= bio->bi_iter.bi_sector +
sectors);
wait_barrier(conf);
}
}
static void raid10_read_request(struct mddev *mddev, struct bio *bio,
struct r10bio *r10_bio)
{
@ -1132,7 +1155,6 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
const int op = bio_op(bio);
const unsigned long do_sync = (bio->bi_opf & REQ_SYNC);
int max_sectors;
sector_t sectors;
struct md_rdev *rdev;
char b[BDEVNAME_SIZE];
int slot = r10_bio->read_slot;
@ -1166,30 +1188,8 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio,
}
rcu_read_unlock();
}
/*
* Register the new request and wait if the reconstruction
* thread has put up a bar for new requests.
* Continue immediately if no resync is active currently.
*/
wait_barrier(conf);
sectors = r10_bio->sectors;
while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
bio->bi_iter.bi_sector < conf->reshape_progress &&
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
/*
* IO spans the reshape position. Need to wait for reshape to
* pass
*/
raid10_log(conf->mddev, "wait reshape");
allow_barrier(conf);
wait_event(conf->wait_barrier,
conf->reshape_progress <= bio->bi_iter.bi_sector ||
conf->reshape_progress >= bio->bi_iter.bi_sector +
sectors);
wait_barrier(conf);
}
regular_request_wait(mddev, conf, bio, r10_bio->sectors);
rdev = read_balance(conf, r10_bio, &max_sectors);
if (!rdev) {
if (err_rdev) {
@ -1332,30 +1332,8 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
finish_wait(&conf->wait_barrier, &w);
}
/*
* Register the new request and wait if the reconstruction
* thread has put up a bar for new requests.
* Continue immediately if no resync is active currently.
*/
wait_barrier(conf);
sectors = r10_bio->sectors;
while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
bio->bi_iter.bi_sector < conf->reshape_progress &&
bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
/*
* IO spans the reshape position. Need to wait for reshape to
* pass
*/
raid10_log(conf->mddev, "wait reshape");
allow_barrier(conf);
wait_event(conf->wait_barrier,
conf->reshape_progress <= bio->bi_iter.bi_sector ||
conf->reshape_progress >= bio->bi_iter.bi_sector +
sectors);
wait_barrier(conf);
}
regular_request_wait(mddev, conf, bio, sectors);
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
(mddev->reshape_backwards
? (bio->bi_iter.bi_sector < conf->reshape_safe &&