linux-kernel - [PATCH 2/9] aio: remove an outdated comment in aio

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Message-Id: <20180321073232.13366-3-hch@lst.de>
Date:   Wed, 21 Mar 2018 08:32:25 +0100
From:   Christoph Hellwig <hch@....de>
To:     viro@...iv.linux.org.uk
Cc:     Avi Kivity <avi@...lladb.com>, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/9] aio: remove an outdated comment in aio_complete

These days we don't treat sync iocbs special in the aio completion code as
they never use it.  Remove the old comment, and move the BUG_ON for a sync
iocb to the top of the function.

Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Jeff Moyer <jmoyer@...hat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/aio.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 03d59593912d..41fc8ce6bc7f 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1088,6 +1088,8 @@ static void aio_complete(struct kiocb *kiocb, long res, long res2)
 	unsigned tail, pos, head;
 	unsigned long	flags;
 
+	BUG_ON(is_sync_kiocb(kiocb));
+
 	if (kiocb->ki_flags & IOCB_WRITE) {
 		struct file *file = kiocb->ki_filp;
 
@@ -1100,15 +1102,6 @@ static void aio_complete(struct kiocb *kiocb, long res, long res2)
 		file_end_write(file);
 	}
 
-	/*
-	 * Special case handling for sync iocbs:
-	 *  - events go directly into the iocb for fast handling
-	 *  - the sync task with the iocb in its stack holds the single iocb
-	 *    ref, no other paths have a way to get another ref
-	 *  - the sync task helpfully left a reference to itself in the iocb
-	 */
-	BUG_ON(is_sync_kiocb(kiocb));
-
 	if (iocb->ki_list.next) {
 		unsigned long flags;
 
-- 
2.14.2