diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-06-07 12:22:15 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-06-07 12:22:15 +0200 |
commit | 5f4457a4f62cc9d78e04c0eb12ff0540899aad89 (patch) | |
tree | 0b973d527ea6b2ae31e08da0746b4965a3c5a6d8 /drivers/md/dm-kcopyd.c | |
parent | 9b94b3a19b13e094c10f65f24bc358f6ffe4eacd (diff) | |
parent | b87297fb405ef13cac375f202d114323b076a56d (diff) |
Merge branch 'linus' into x86/cpu
Diffstat (limited to 'drivers/md/dm-kcopyd.c')
-rw-r--r-- | drivers/md/dm-kcopyd.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c index 0a225da2127..3e3fc06cb86 100644 --- a/drivers/md/dm-kcopyd.c +++ b/drivers/md/dm-kcopyd.c @@ -297,7 +297,8 @@ static int run_complete_job(struct kcopyd_job *job) dm_kcopyd_notify_fn fn = job->fn; struct dm_kcopyd_client *kc = job->kc; - kcopyd_put_pages(kc, job->pages); + if (job->pages) + kcopyd_put_pages(kc, job->pages); mempool_free(job, kc->job_pool); fn(read_err, write_err, context); @@ -461,6 +462,7 @@ static void segment_complete(int read_err, unsigned long write_err, sector_t progress = 0; sector_t count = 0; struct kcopyd_job *job = (struct kcopyd_job *) context; + struct dm_kcopyd_client *kc = job->kc; mutex_lock(&job->lock); @@ -490,7 +492,7 @@ static void segment_complete(int read_err, unsigned long write_err, if (count) { int i; - struct kcopyd_job *sub_job = mempool_alloc(job->kc->job_pool, + struct kcopyd_job *sub_job = mempool_alloc(kc->job_pool, GFP_NOIO); *sub_job = *job; @@ -509,13 +511,16 @@ static void segment_complete(int read_err, unsigned long write_err, } else if (atomic_dec_and_test(&job->sub_jobs)) { /* - * To avoid a race we must keep the job around - * until after the notify function has completed. - * Otherwise the client may try and stop the job - * after we've completed. + * Queue the completion callback to the kcopyd thread. + * + * Some callers assume that all the completions are called + * from a single thread and don't race with each other. + * + * We must not call the callback directly here because this + * code may not be executing in the thread. */ - job->fn(read_err, write_err, job->context); - mempool_free(job, job->kc->job_pool); + push(&kc->complete_jobs, job); + wake(kc); } } @@ -528,6 +533,8 @@ static void split_job(struct kcopyd_job *job) { int i; + atomic_inc(&job->kc->nr_jobs); + atomic_set(&job->sub_jobs, SPLIT_COUNT); for (i = 0; i < SPLIT_COUNT; i++) segment_complete(0, 0u, job); |