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>
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6f25ece..b261e55 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1907,7 +1907,6 @@
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 @@
} 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 @@
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 @@
}
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);