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Merge tag 'md/4.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
Pull MD fixes from Shaohua Li: "A few fixes for MD. Mainly fix a problem introduced in 4.13, which we retry bio for some code paths but not all in some situations" * tag 'md/4.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md: md/raid5: cap worker count dm-raid: fix a race condition in request handling md: fix a race condition for flush request handling md: separate request handling
This commit is contained in:
commit
7b5ef82336
4 changed files with 50 additions and 32 deletions
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@ -3238,7 +3238,7 @@ static int raid_map(struct dm_target *ti, struct bio *bio)
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if (unlikely(bio_end_sector(bio) > mddev->array_sectors))
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return DM_MAPIO_REQUEUE;
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mddev->pers->make_request(mddev, bio);
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md_handle_request(mddev, bio);
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return DM_MAPIO_SUBMITTED;
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}
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@ -266,6 +266,37 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
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* call has finished, the bio has been linked into some internal structure
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* and so is visible to ->quiesce(), so we don't need the refcount any more.
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*/
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void md_handle_request(struct mddev *mddev, struct bio *bio)
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{
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check_suspended:
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rcu_read_lock();
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if (mddev->suspended) {
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DEFINE_WAIT(__wait);
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for (;;) {
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prepare_to_wait(&mddev->sb_wait, &__wait,
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TASK_UNINTERRUPTIBLE);
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if (!mddev->suspended)
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break;
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rcu_read_unlock();
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schedule();
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rcu_read_lock();
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}
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finish_wait(&mddev->sb_wait, &__wait);
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}
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atomic_inc(&mddev->active_io);
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rcu_read_unlock();
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if (!mddev->pers->make_request(mddev, bio)) {
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atomic_dec(&mddev->active_io);
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wake_up(&mddev->sb_wait);
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goto check_suspended;
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}
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if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
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wake_up(&mddev->sb_wait);
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}
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EXPORT_SYMBOL(md_handle_request);
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static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
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{
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const int rw = bio_data_dir(bio);
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@ -285,23 +316,6 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
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bio_endio(bio);
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return BLK_QC_T_NONE;
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}
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check_suspended:
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rcu_read_lock();
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if (mddev->suspended) {
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DEFINE_WAIT(__wait);
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for (;;) {
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prepare_to_wait(&mddev->sb_wait, &__wait,
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TASK_UNINTERRUPTIBLE);
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if (!mddev->suspended)
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break;
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rcu_read_unlock();
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schedule();
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rcu_read_lock();
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}
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finish_wait(&mddev->sb_wait, &__wait);
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}
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atomic_inc(&mddev->active_io);
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rcu_read_unlock();
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/*
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* save the sectors now since our bio can
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@ -310,20 +324,14 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
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sectors = bio_sectors(bio);
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/* bio could be mergeable after passing to underlayer */
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bio->bi_opf &= ~REQ_NOMERGE;
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if (!mddev->pers->make_request(mddev, bio)) {
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atomic_dec(&mddev->active_io);
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wake_up(&mddev->sb_wait);
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goto check_suspended;
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}
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md_handle_request(mddev, bio);
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cpu = part_stat_lock();
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part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
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part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
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part_stat_unlock();
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if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
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wake_up(&mddev->sb_wait);
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return BLK_QC_T_NONE;
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}
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@ -439,16 +447,22 @@ static void md_submit_flush_data(struct work_struct *ws)
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struct mddev *mddev = container_of(ws, struct mddev, flush_work);
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struct bio *bio = mddev->flush_bio;
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/*
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* must reset flush_bio before calling into md_handle_request to avoid a
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* deadlock, because other bios passed md_handle_request suspend check
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* could wait for this and below md_handle_request could wait for those
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* bios because of suspend check
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*/
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mddev->flush_bio = NULL;
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wake_up(&mddev->sb_wait);
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if (bio->bi_iter.bi_size == 0)
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/* an empty barrier - all done */
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bio_endio(bio);
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else {
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bio->bi_opf &= ~REQ_PREFLUSH;
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mddev->pers->make_request(mddev, bio);
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md_handle_request(mddev, bio);
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}
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mddev->flush_bio = NULL;
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wake_up(&mddev->sb_wait);
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}
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void md_flush_request(struct mddev *mddev, struct bio *bio)
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@ -692,6 +692,7 @@ extern void md_stop_writes(struct mddev *mddev);
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extern int md_rdev_init(struct md_rdev *rdev);
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extern void md_rdev_clear(struct md_rdev *rdev);
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extern void md_handle_request(struct mddev *mddev, struct bio *bio);
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extern void mddev_suspend(struct mddev *mddev);
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extern void mddev_resume(struct mddev *mddev);
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extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
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@ -6575,14 +6575,17 @@ static ssize_t
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raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
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{
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struct r5conf *conf;
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unsigned long new;
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unsigned int new;
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int err;
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struct r5worker_group *new_groups, *old_groups;
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int group_cnt, worker_cnt_per_group;
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if (len >= PAGE_SIZE)
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return -EINVAL;
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if (kstrtoul(page, 10, &new))
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if (kstrtouint(page, 10, &new))
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return -EINVAL;
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/* 8192 should be big enough */
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if (new > 8192)
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return -EINVAL;
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err = mddev_lock(mddev);
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