X-Git-Url: http://git.efficios.com/?p=test-ssd.git;a=blobdiff_plain;f=test-ssd-write.c;h=ea852481e6b94f776cf8df1b983fac7293249311;hp=102c72b74ddfafc0a2a133845ea64e7e29e31148;hb=HEAD;hpb=7d72dbf53fd2efec4ea71ffb10f1bade3867d8fe

diff --git a/test-ssd-write.c b/test-ssd-write.c
index 102c72b..ea85248 100644
--- a/test-ssd-write.c
+++ b/test-ssd-write.c
@@ -16,6 +16,7 @@
  * Intel (Lenovo) SSDSC2BW180A3L LE1i       SandForce 2281 1 (3.5 Debian kernel)   Lenovo x230        G2ET90WW (2.50) 2012-20-12
  * Intel (Lenovo) SSDSC2BW180A3L LF1i       SandForce 2281 2 (3.2 Debian kernel)   Lenovo x230        G2ET90WW (2.50) 2012-20-12
  * Intel (Lenovo) SSDSC2BW180A3L LF1i       SandForce 2281 1 (3.7.9 Arch kernel)   Lenovo x230        G2ET86WW (2.06) 2012-11-13
+ * Intel (Lenovo) SSDSC2BW180A3L LF1i       SandForce 2281 1 (3.2 Debian kernel)   Lenovo x200
  *
  * In order to narrow down the problem, we ran this test on a number of
  * other hardware configurations which don't show this problem:
@@ -28,7 +29,6 @@
  * Intel          SSDSC2CT120A3K5 ???????   SandForce 2281 1 (on HP SmartArray P212 with 3.2 kernel)
  * OCZ            OCZ-VERTEX3        2.25   SF-2281        1 (3.7.9 Arch kernel)
  * OCZ            OCZSSD2-2VTXE180G  1.37   SF-1200        1 (3.7.6 Arch kernel)
- * Intel (Lenovo) SSDSC2BW180A3L LF1i       SandForce 2281 3 (3.2 Debian kernel)   Lenovo x200
  *
  * Under Linux (Debian, Ubuntu, various kernels), after about 5 minutes,
  * we get this result:
@@ -146,13 +146,18 @@ static int rand_write(int fd, size_t len)
 	uint64_t valcount;
 	int ret;
 
+	if (len < BUFLEN) {
+		fprintf(stderr, "Error: File size needs to be at least %u\n", BUFLEN);
+		exit(EXIT_FAILURE);
+	}
+
 	memset(buf, 0, BUFLEN);
 
 	for (;;) {
 		if (len > UINT32_MAX) {
-			offset = (((size_t) rand() << 32) + (size_t) rand()) % len;
+			offset = (((size_t) rand() << 32) + (size_t) rand()) % (len - BUFLEN);
 		} else {
-			offset = rand() % len;
+			offset = rand() % (len - BUFLEN);
 		}
 
 		if ((offset >= validate_offset &&