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Subject[PATCH 8/8] fs/aio: Use rcu_work instead of explicit rcu and work item
Date
Workqueue now has rcu_work.  Use it instead of open-coding rcu -> work
item bouncing.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
Hello,

If there's no objection, I'll route this together with rcu_work patch
through wq/for-4.17.

Thanks.

fs/aio.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 6bcd3fb..88d7927 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -115,8 +115,7 @@ struct kioctx {
struct page **ring_pages;
long nr_pages;

- struct rcu_head free_rcu;
- struct work_struct free_work; /* see free_ioctx() */
+ struct rcu_work free_rwork; /* see free_ioctx() */

/*
* signals when all in-flight requests are done
@@ -592,13 +591,12 @@ static int kiocb_cancel(struct aio_kiocb *kiocb)
/*
* free_ioctx() should be RCU delayed to synchronize against the RCU
* protected lookup_ioctx() and also needs process context to call
- * aio_free_ring(), so the double bouncing through kioctx->free_rcu and
- * ->free_work.
+ * aio_free_ring(). Use rcu_work.
*/
static void free_ioctx(struct work_struct *work)
{
- struct kioctx *ctx = container_of(work, struct kioctx, free_work);
-
+ struct kioctx *ctx = container_of(to_rcu_work(work), struct kioctx,
+ free_rwork);
pr_debug("freeing %p\n", ctx);

aio_free_ring(ctx);
@@ -608,14 +606,6 @@ static void free_ioctx(struct work_struct *work)
kmem_cache_free(kioctx_cachep, ctx);
}

-static void free_ioctx_rcufn(struct rcu_head *head)
-{
- struct kioctx *ctx = container_of(head, struct kioctx, free_rcu);
-
- INIT_WORK(&ctx->free_work, free_ioctx);
- schedule_work(&ctx->free_work);
-}
-
static void free_ioctx_reqs(struct percpu_ref *ref)
{
struct kioctx *ctx = container_of(ref, struct kioctx, reqs);
@@ -625,7 +615,8 @@ static void free_ioctx_reqs(struct percpu_ref *ref)
complete(&ctx->rq_wait->comp);

/* Synchronize against RCU protected table->table[] dereferences */
- call_rcu(&ctx->free_rcu, free_ioctx_rcufn);
+ INIT_RCU_WORK(&ctx->free_rwork, free_ioctx);
+ queue_rcu_work(system_wq, &ctx->free_rwork);
}

/*
--
2.9.5
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