From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Mon, 10 Jun 2013 16:25:54 +0000 (-0400)
Subject: discard_io: Make it possible to give start and end LBA's.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=318100435cbded142941b3e491bcb30f1211d932;p=xentesttools%2Fbootstrap.git

discard_io: Make it possible to give start and end LBA's.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---

diff --git a/root_image/tools/discard_io/discard_io.c b/root_image/tools/discard_io/discard_io.c
index b10562c..d3b0e2d 100644
--- a/root_image/tools/discard_io/discard_io.c
+++ b/root_image/tools/discard_io/discard_io.c
@@ -10,22 +10,32 @@
 
 int main(int argc, char *argv[])
 {
-	char *name = "/dev/xvda";
+	char *name = "/dev/xvda1";
 	int disk;
 	unsigned long range[2];
+	unsigned long start = 0, end = 4096;
 	int rc;
 
-	if (argc >= 1)
+	if (argc >= 1) {
 		name = argv[1];
-
+		if (argc >= 2) {
+			start = atoi(argv[2]);
+			end = atoi(argv[3]);
+		}
+	}
 	disk = open(name, O_RDWR | O_EXCL | O_LARGEFILE);
 	if (disk == -1) {
 		fprintf(stderr,"Cannot open %s [%s]\n", name, strerror(errno));
 		return errno;
 	}
-	range[0] = 0;
-	range[1] = (-1ULL);
+	range[0] = start;
+	range[1] = end;
+	fprintf(stderr, "%s[%d->%d]\n", name, start, end);
 	rc = ioctl(disk,  BLKDISCARD, &range);
+	if (rc) {
+		fprintf(stderr, "%s[%d->%d]: %d, %s\n", name, range[0], range[1], rc, strerror(errno));
+	}
+
 	close(disk);
 	return rc;
 }