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authorTejun Heo <tj@kernel.org>2011-01-13 19:59:59 +0000
committerAlasdair G Kergon <agk@redhat.com>2011-01-13 19:59:59 +0000
commit239c8dd533e74de4a7f3c85c4f9f430eb08867c1 (patch)
tree0dfb9e39aad0f2ab09a4f278a6e7f1b46bf64307 /drivers/md/dm-snap-persistent.c
parent9c4376de98719d2768dd919553843de34bb094a6 (diff)
downloadop-kernel-dev-239c8dd533e74de4a7f3c85c4f9f430eb08867c1.zip
op-kernel-dev-239c8dd533e74de4a7f3c85c4f9f430eb08867c1.tar.gz
dm snapshot: persistent make metadata_wq multithreaded
metadata_wq serves on-stack work items from chunk_io(). Even if multiple chunk_io() are simultaneously in progress, each is independent and queued only once, so multithreaded workqueue can be safely used. Switch metadata_wq to multithread and flush the work item instead of the workqueue in chunk_io(). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-snap-persistent.c')
-rw-r--r--drivers/md/dm-snap-persistent.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index d3021a6..95891df 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -256,7 +256,7 @@ static int chunk_io(struct pstore *ps, void *area, chunk_t chunk, int rw,
*/
INIT_WORK_ONSTACK(&req.work, do_metadata);
queue_work(ps->metadata_wq, &req.work);
- flush_workqueue(ps->metadata_wq);
+ flush_work(&req.work);
return req.result;
}
@@ -818,7 +818,7 @@ static int persistent_ctr(struct dm_exception_store *store,
atomic_set(&ps->pending_count, 0);
ps->callbacks = NULL;
- ps->metadata_wq = alloc_ordered_workqueue("ksnaphd", WQ_MEM_RECLAIM);
+ ps->metadata_wq = alloc_workqueue("ksnaphd", WQ_MEM_RECLAIM, 0);
if (!ps->metadata_wq) {
kfree(ps);
DMERR("couldn't start header metadata update thread");
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