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| author | Cesar Eduardo Barros <cesarb@cesarb.net> | 2011-03-22 16:33:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:07 -0700 |
| commit | f2090d2df51d7cdb2f952dcfdcd8baaac0aec444 (patch) | |
| tree | 474daba281f890d44ee22b23137d99cb5021f381 /mm/swapfile.c | |
| parent | 7de7fb6b3422e6d1dac00666a992834085e745dc (diff) | |
| download | lwn-f2090d2df51d7cdb2f952dcfdcd8baaac0aec444.tar.gz lwn-f2090d2df51d7cdb2f952dcfdcd8baaac0aec444.zip | |
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 <cesarb@cesarb.net>
Tested-by: Eric B Munson <emunson@mgebm.net>
Acked-by: Eric B Munson <emunson@mgebm.net>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 19 |
1 files 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); |