linux-kernel - [PATCHv2 11/24] sys_swapon: do only cleanup in the cleanup blocks

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Message-Id: <1299343345-3984-12-git-send-email-cesarb@cesarb.net>
Date:	Sat,  5 Mar 2011 13:42:12 -0300
From:	Cesar Eduardo Barros <cesarb@...arb.net>
To:	linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>, linux-kernel@...r.kernel.org,
	Eric B Munson <emunson@...bm.net>,
	Cesar Eduardo Barros <cesarb@...arb.net>
Subject: [PATCHv2 11/24] sys_swapon: do only cleanup in the cleanup blocks

The only way error is 0 in the cleanup blocks is when the function is
returning successfully. In this case, the cleanup blocks were setting
S_SWAPFILE in the S_ISREG case. But this is not a cleanup.

Move the setting of S_SWAPFILE to just before the "goto out;" to make
this more clear. At this point, we do not need to test for inode because
it will never be NULL.

Signed-off-by: Cesar Eduardo Barros <cesarb@...arb.net>
Tested-by: Eric B Munson <emunson@...bm.net>
Acked-by: Eric B Munson <emunson@...bm.net>
---
 mm/swapfile.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index bc00c1a..ebc0307 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2136,6 +2136,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 	atomic_inc(&proc_poll_event);
 	wake_up_interruptible(&proc_poll_wait);
 
+	if (S_ISREG(inode->i_mode))
+		inode->i_flags |= S_SWAPFILE;
 	error = 0;
 	goto out;
 bad_swap:
@@ -2160,11 +2162,8 @@ out:
 	}
 	if (name)
 		putname(name);
-	if (inode && S_ISREG(inode->i_mode)) {
-		if (!error)
-			inode->i_flags |= S_SWAPFILE;
+	if (inode && S_ISREG(inode->i_mode))
 		mutex_unlock(&inode->i_mutex);
-	}
 	return error;
 }
 
-- 
1.7.4

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