diff options
Diffstat (limited to 'drivers/md/dm-kcopyd.c')
| -rw-r--r-- | drivers/md/dm-kcopyd.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c index 2fc4213e02b5..671c24332802 100644 --- a/drivers/md/dm-kcopyd.c +++ b/drivers/md/dm-kcopyd.c @@ -56,15 +56,17 @@ struct dm_kcopyd_client { atomic_t nr_jobs; /* - * We maintain three lists of jobs: + * We maintain four lists of jobs: * * i) jobs waiting for pages * ii) jobs that have pages, and are waiting for the io to be issued. - * iii) jobs that have completed. + * iii) jobs that don't need to do any IO and just run a callback + * iv) jobs that have completed. * - * All three of these are protected by job_lock. + * All four of these are protected by job_lock. */ spinlock_t job_lock; + struct list_head callback_jobs; struct list_head complete_jobs; struct list_head io_jobs; struct list_head pages_jobs; @@ -625,6 +627,7 @@ static void do_work(struct work_struct *work) struct dm_kcopyd_client *kc = container_of(work, struct dm_kcopyd_client, kcopyd_work); struct blk_plug plug; + unsigned long flags; /* * The order that these are called is *very* important. @@ -633,6 +636,10 @@ static void do_work(struct work_struct *work) * list. io jobs call wake when they complete and it all * starts again. */ + spin_lock_irqsave(&kc->job_lock, flags); + list_splice_tail_init(&kc->callback_jobs, &kc->complete_jobs); + spin_unlock_irqrestore(&kc->job_lock, flags); + blk_start_plug(&plug); process_jobs(&kc->complete_jobs, kc, run_complete_job); process_jobs(&kc->pages_jobs, kc, run_pages_job); @@ -650,7 +657,7 @@ static void dispatch_job(struct kcopyd_job *job) struct dm_kcopyd_client *kc = job->kc; atomic_inc(&kc->nr_jobs); if (unlikely(!job->source.count)) - push(&kc->complete_jobs, job); + push(&kc->callback_jobs, job); else if (job->pages == &zero_page_list) push(&kc->io_jobs, job); else @@ -858,7 +865,7 @@ void dm_kcopyd_do_callback(void *j, int read_err, unsigned long write_err) job->read_err = read_err; job->write_err = write_err; - push(&kc->complete_jobs, job); + push(&kc->callback_jobs, job); wake(kc); } EXPORT_SYMBOL(dm_kcopyd_do_callback); @@ -888,6 +895,7 @@ struct dm_kcopyd_client *dm_kcopyd_client_create(struct dm_kcopyd_throttle *thro return ERR_PTR(-ENOMEM); spin_lock_init(&kc->job_lock); + INIT_LIST_HEAD(&kc->callback_jobs); INIT_LIST_HEAD(&kc->complete_jobs); INIT_LIST_HEAD(&kc->io_jobs); INIT_LIST_HEAD(&kc->pages_jobs); @@ -939,6 +947,7 @@ void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc) /* Wait for completion of all jobs submitted by this client. */ wait_event(kc->destroyq, !atomic_read(&kc->nr_jobs)); + BUG_ON(!list_empty(&kc->callback_jobs)); BUG_ON(!list_empty(&kc->complete_jobs)); BUG_ON(!list_empty(&kc->io_jobs)); BUG_ON(!list_empty(&kc->pages_jobs)); |