btrfs: Remove redundant local zero structure
Remove redundant local zero structure, replacing it by the kernel's
global ZERO_PAGE.
Signed-off-by: Dulshani Gunawardhana <dulshani.gunawardhana89@gmail.com>
Reviewed-by: Zach Brown <zab@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9ea0550..78d2048 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -368,9 +368,8 @@
int btrfs_is_empty_uuid(u8 *uuid)
{
- static char empty_uuid[BTRFS_UUID_SIZE] = {0};
-
- return !memcmp(uuid, empty_uuid, BTRFS_UUID_SIZE);
+ BUILD_BUG_ON(BTRFS_UUID_SIZE > PAGE_SIZE);
+ return !memcmp(uuid, empty_zero_page, BTRFS_UUID_SIZE);
}
static noinline int create_subvol(struct inode *dir,
