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authorHugh Dickins <hughd@google.com>2012-03-29 01:42:42 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-29 04:14:35 +0400
commitd15cab975459fb6092eeba1be72c13621337784f (patch)
tree5c1d8d18c65a34eb738c97d75f2c44becdff1de3 /include
parent29fd66d289f2981e11c550f8b411a6d3d38be0cf (diff)
downloadlinux-d15cab975459fb6092eeba1be72c13621337784f.tar.xz
swapon: check validity of swap_flags
Most system calls taking flags first check that the flags passed in are valid, and that helps userspace to detect when new flags are supported. But swapon never did so: start checking now, to help if we ever want to support more swap_flags in future. It's difficult to get stray bits set in an int, and swapon is not widely used, so this is most unlikely to break any userspace; but we can just revert if it turns out to do so. Signed-off-by: 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 'include')
-rw-r--r--include/linux/swap.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index b86b5c20617d..8dc0ea7caf02 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -21,6 +21,9 @@ struct bio;
#define SWAP_FLAG_PRIO_SHIFT 0
#define SWAP_FLAG_DISCARD 0x10000 /* discard swap cluster after use */
+#define SWAP_FLAGS_VALID (SWAP_FLAG_PRIO_MASK | SWAP_FLAG_PREFER | \
+ SWAP_FLAG_DISCARD)
+
static inline int current_is_kswapd(void)
{
return current->flags & PF_KSWAPD;