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authorCesar Eduardo Barros <cesarb@cesarb.net>2011-03-23 02:33:21 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 03:44:07 +0300
commit83ef99befc324803a54cf2a5fab5a322df3a99d6 (patch)
treed56035f4683a387ac8bf0d37b21b15f7d04de672 /mm/swapfile.c
parent28b36bd741bd44db30e12b1048a659aa346e9b76 (diff)
downloadlinux-83ef99befc324803a54cf2a5fab5a322df3a99d6.tar.xz
sys_swapon: remove did_down variable
Since mutex_lock(&inode->i_mutex) is called just after setting inode, did_down is always equivalent to (inode && S_ISREG(inode->i_mode)). Use this fact to remove the did_down 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.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6f25ece88c4a..b261e55e0b82 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1907,7 +1907,6 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
unsigned char *swap_map = NULL;
struct page *page = NULL;
struct inode *inode = NULL;
- int did_down = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -1962,7 +1961,6 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
} else if (S_ISREG(inode->i_mode)) {
p->bdev = inode->i_sb->s_bdev;
mutex_lock(&inode->i_mutex);
- did_down = 1;
if (IS_SWAPFILE(inode)) {
error = -EBUSY;
goto bad_swap;
@@ -2154,10 +2152,8 @@ bad_swap_2:
spin_unlock(&swap_lock);
vfree(swap_map);
if (swap_file) {
- if (did_down) {
+ if (inode && S_ISREG(inode->i_mode))
mutex_unlock(&inode->i_mutex);
- did_down = 0;
- }
filp_close(swap_file, NULL);
}
out:
@@ -2167,7 +2163,7 @@ out:
}
if (name)
putname(name);
- if (did_down) {
+ if (inode && S_ISREG(inode->i_mode)) {
if (!error)
inode->i_flags |= S_SWAPFILE;
mutex_unlock(&inode->i_mutex);