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fs/aio: Use rcu_work instead of explicit rcu and work item 

Workqueue now has rcu_work.  Use it instead of open-coding rcu -> work
item bouncing.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2018-03-14 12:45:15 -07:00
parent 8f36aaec9c
commit f729863a8c
1 changed files with 6 additions and 15 deletions
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21
fs/aio.c
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@ -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);
}
/*