From 3f11723d7dd278329a3721bfc9c36835119f3a81 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Mon, 11 Mar 2013 15:47:33 -0400
Subject: [PATCH] discard_io: Little tool to send DISCARD commands.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 root_image/Makefile                      |  1 +
 root_image/tools/Makefile                |  1 +
 root_image/tools/discard_io/Makefile     | 25 +++++++++++++++++++
 root_image/tools/discard_io/discard_io.c | 31 ++++++++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 root_image/tools/discard_io/Makefile
 create mode 100644 root_image/tools/discard_io/discard_io.c

diff --git a/root_image/Makefile b/root_image/Makefile
index d152930..1d01231 100644
--- a/root_image/Makefile
+++ b/root_image/Makefile
@@ -941,6 +941,7 @@ xtt-tools-install:
 	$(INSTALL_PROG)   tools/debug/fb_test     userspace/usr/bin/
 	$(INSTALL_PROG)   tools/crashme/crashme     userspace/usr/bin/
 	$(INSTALL_PROG)   tools/eatmem/eatmem     userspace/usr/bin/
+	$(INSTALL_PROG)   tools/discard_io/discard_io     userspace/usr/bin/
 
 fio/fio: fio/fio
 	$(MAKE) -j$$(($(NCPUS) * 2)) -C fio
diff --git a/root_image/tools/Makefile b/root_image/tools/Makefile
index bf40b67..da5eeee 100644
--- a/root_image/tools/Makefile
+++ b/root_image/tools/Makefile
@@ -5,6 +5,7 @@ SUBDIRS += debug
 SUBDIRS += eatmem
 SUBDIRS += crashme
 SUBDIRS += read_intr
+SUBDIRS += discard_io
 
 .PHONY:	all
 all:
diff --git a/root_image/tools/discard_io/Makefile b/root_image/tools/discard_io/Makefile
new file mode 100644
index 0000000..a75bbf7
--- /dev/null
+++ b/root_image/tools/discard_io/Makefile
@@ -0,0 +1,25 @@
+TARGETS-y := discard_io
+TARGETS := $(TARGETS-y)
+
+INSTALL_BIN-y := discard_io
+INSTALL_BIN := $(INSTALL_BIN-y)
+
+
+.PHONY: all
+all: build
+
+.PHONY: build
+build: $(TARGETS)
+
+.PHONY: install
+install: build
+	$(INSTALL_DIR) $(DESTDIR)$(BINDIR)
+	$(INSTALL_DIR) $(DESTDIR)$(SBINDIR)
+
+.PHONY: clean
+clean:
+	$(RM) *.o $(TARGETS) *~ $(DEPS)
+
+%.o: %.c $(HDRS) Makefile
+	$(CC) -c $(CFLAGS) -o $@ $<
+
diff --git a/root_image/tools/discard_io/discard_io.c b/root_image/tools/discard_io/discard_io.c
new file mode 100644
index 0000000..b10562c
--- /dev/null
+++ b/root_image/tools/discard_io/discard_io.c
@@ -0,0 +1,31 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <errno.h>
+#include <string.h>
+
+
+int main(int argc, char *argv[])
+{
+	char *name = "/dev/xvda";
+	int disk;
+	unsigned long range[2];
+	int rc;
+
+	if (argc >= 1)
+		name = argv[1];
+
+	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);
+	rc = ioctl(disk,  BLKDISCARD, &range);
+	close(disk);
+	return rc;
+}
-- 
2.39.5