linux-kernel - [PATCH 3.16 351/357] aio: block exit_aio() until all context requests are completed

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Message-Id: <20141003212944.003662008@linuxfoundation.org>
Date:	Fri,  3 Oct 2014 14:32:17 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Gu Zheng <guz.fnst@...fujitsu.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Ben Hutchings <ben@...adent.org.uk>
Subject: [PATCH 3.16 351/357] aio: block exit_aio() until all context requests are completed

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gu Zheng <guz.fnst@...fujitsu.com>

commit 6098b45b32e6baeacc04790773ced9340601d511 upstream.

It seems that exit_aio() also needs to wait for all iocbs to complete (like
io_destroy), but we missed the wait step in current implemention, so fix
it in the same way as we did in io_destroy.

Signed-off-by: Gu Zheng <guz.fnst@...fujitsu.com>
Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>

---
 fs/aio.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/fs/aio.c
+++ b/fs/aio.c
@@ -797,6 +797,9 @@ void exit_aio(struct mm_struct *mm)
 	unsigned i = 0;
 
 	while (1) {
+		struct completion requests_done =
+			COMPLETION_INITIALIZER_ONSTACK(requests_done);
+
 		rcu_read_lock();
 		table = rcu_dereference(mm->ioctx_table);
 
@@ -824,7 +827,10 @@ void exit_aio(struct mm_struct *mm)
 		 */
 		ctx->mmap_size = 0;
 
-		kill_ioctx(mm, ctx, NULL);
+		kill_ioctx(mm, ctx, &requests_done);
+
+		/* Wait until all IO for the context are done. */
+		wait_for_completion(&requests_done);
 	}
 }
 


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