From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754254Ab1CEQw3 (ORCPT ); Sat, 5 Mar 2011 11:52:29 -0500 Received: from smtp-03.mandic.com.br ([200.225.81.143]:33422 "EHLO smtp-03.mandic.com.br" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753286Ab1CEQtS (ORCPT ); Sat, 5 Mar 2011 11:49:18 -0500 From: Cesar Eduardo Barros To: linux-mm@kvack.org Cc: Andrew Morton , Hugh Dickins , KAMEZAWA Hiroyuki , Minchan Kim , Jens Axboe , linux-kernel@vger.kernel.org, Eric B Munson , Cesar Eduardo Barros Subject: [PATCHv2 10/24] sys_swapon: remove bdev variable Date: Sat, 5 Mar 2011 13:42:11 -0300 Message-Id: <1299343345-3984-11-git-send-email-cesarb@cesarb.net> X-Mailer: git-send-email 1.7.4 In-Reply-To: <1299343345-3984-1-git-send-email-cesarb@cesarb.net> References: <1299343345-3984-1-git-send-email-cesarb@cesarb.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The bdev variable is always equivalent to (S_ISBLK(inode->i_mode) ? p->bdev : NULL), as long as it being set is moved to a bit earlier. Use this fact to remove the bdev variable. Signed-off-by: Cesar Eduardo Barros Tested-by: Eric B Munson Acked-by: Eric B Munson --- mm/swapfile.c | 19 +++++++++---------- 1 files changed, 9 insertions(+), 10 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index c655389..bc00c1a 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1893,7 +1893,6 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) { struct swap_info_struct *p; char *name; - struct block_device *bdev = NULL; struct file *swap_file = NULL; struct address_space *mapping; int i, prev; @@ -1944,19 +1943,19 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) } if (S_ISBLK(inode->i_mode)) { - bdev = bdgrab(I_BDEV(inode)); - error = blkdev_get(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL, + p->bdev = bdgrab(I_BDEV(inode)); + error = blkdev_get(p->bdev, + FMODE_READ | FMODE_WRITE | FMODE_EXCL, sys_swapon); if (error < 0) { - bdev = NULL; + p->bdev = NULL; error = -EINVAL; goto bad_swap; } - p->old_block_size = block_size(bdev); - error = set_blocksize(bdev, PAGE_SIZE); + p->old_block_size = block_size(p->bdev); + error = set_blocksize(p->bdev, PAGE_SIZE); if (error < 0) goto bad_swap; - p->bdev = bdev; p->flags |= SWP_BLKDEV; } else if (S_ISREG(inode->i_mode)) { p->bdev = inode->i_sb->s_bdev; @@ -2140,9 +2139,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) error = 0; goto out; bad_swap: - if (bdev) { - set_blocksize(bdev, p->old_block_size); - blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); + if (S_ISBLK(inode->i_mode) && p->bdev) { + set_blocksize(p->bdev, p->old_block_size); + blkdev_put(p->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); } destroy_swap_extents(p); swap_cgroup_swapoff(p->type); -- 1.7.4