From f2090d2df51d7cdb2f952dcfdcd8baaac0aec444 Mon Sep 17 00:00:00 2001 From: Cesar Eduardo Barros Date: Tue, 22 Mar 2011 16:33:23 -0700 Subject: [PATCH] sys_swapon: remove bdev variable 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 Reviewed-by: KAMEZAWA Hiroyuki Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/swapfile.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index e4dc94996c58..a314d42c0fa5 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); -- 2.30.2