Test for holes in swapfiles
-Erik
diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index a57dfe4..918a5bc 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -48,6 +48,18 @@
static int swap_enable_disable(const char *device)
{
int status;
+ struct stat st;
+
+ if (stat(device, &st) < 0) {
+ perror_msg_and_die("cannot stat %s");
+ }
+
+ /* test for holes */
+ if (S_ISREG(st.st_mode)) {
+ if (st.st_blocks * 512 < st.st_size) {
+ error_msg_and_die("swap file has holes");
+ }
+ }
if (whichApp == SWAPON_APP)
status = swapon(device, 0);