Signed-off-by: Johannes Thumshirn <redacted>
---
 common/sg               |  2 +-
 src/.gitignore          |  1 +
 src/Makefile            |  2 +-
 src/sg/dxfer-from-dev.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/sg/sg-dxfer.c       | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 tests/sg/002            | 38 +++++++++++++++++++++++++++++++++
 tests/sg/002.out        |  3 +++
 7 files changed, 158 insertions(+), 2 deletions(-)
 create mode 100644 src/sg/dxfer-from-dev.c
 create mode 100644 src/sg/sg-dxfer.c
 create mode 100755 tests/sg/002
 create mode 100644 tests/sg/002.out

diff --git a/common/sg b/common/sg
index c306af500350..19732ec6a541 100644
--- a/common/sg
+++ b/common/sg

@@ -30,5 +30,5 @@ _test_dev_is_scsi() {
 }
 
 _get_sg_from_blockdev() {
-	echo /sys/block/"$1"/device/scsi_generic/sg+([0-9])
+	echo ${TEST_DEV_SYSFS}/device/scsi_generic/sg* | grep -Eo "sg[0-9]+"
 }

diff --git a/src/.gitignore b/src/.gitignore
index 722c137c7fca..0fca08a74fb1 100644
--- a/src/.gitignore
+++ b/src/.gitignore

@@ -1 +1,2 @@
 /sg/syzkaller1
+/sg/dxfer-from-dev

diff --git a/src/Makefile b/src/Makefile
index 0e8d74688db4..57b6bb25793a 100644
--- a/src/Makefile
+++ b/src/Makefile

@@ -1,4 +1,4 @@
-TARGETS := sg/syzkaller1
+TARGETS := sg/syzkaller1 sg/dxfer-from-dev
 
 CFLAGS := -O2
 

diff --git a/src/sg/dxfer-from-dev.c b/src/sg/dxfer-from-dev.c
new file mode 100644
index 000000000000..ca52f30e23af
--- /dev/null
+++ b/src/sg/dxfer-from-dev.c

@@ -0,0 +1,57 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <scsi/sg.h>
+
+int main(int argc, char **argv)
+{
+	int fd;
+	int rc;
+	int rsz = 131072;
+	int tout = 10800000;
+	char buf[42] = { 0 };
+
+	if (argc != 2) {
+		printf("usage: %s /dev/sgX\n", argv[0]);
+		return 1;
+	}
+
+	fd = open(argv[1], O_RDWR);
+	if (fd < 0) {
+		perror("open");
+		return 1;
+	}
+
+	rc = ioctl(fd, SG_SET_RESERVED_SIZE, &rsz);
+	if (rc < 0) {
+		perror("ioctl SG_SET_RESERVED_SIZE");
+		goto out_close;
+	}
+
+	rc = ioctl(fd, SG_SET_TIMEOUT, &tout);
+	if (rc < 0) {
+		perror("ioctl SG_SET_TIMEOUT");
+		goto out_close;
+	}
+
+	buf[4] = 'H';
+	rc = write(fd, &buf, sizeof(buf));
+	if (rc < 0) {
+		perror("write");
+		if (errno == EINVAL)
+			printf("FAIL\n");
+		goto out_close;
+	}
+
+	printf("PASS\n");
+
+out_close:
+	close(fd);
+}

diff --git a/src/sg/sg-dxfer.c b/src/sg/sg-dxfer.c
new file mode 100644
index 000000000000..ca52f30e23af
--- /dev/null
+++ b/src/sg/sg-dxfer.c

diff --git a/tests/sg/002 b/tests/sg/002
new file mode 100755
index 000000000000..c8b39091f82a
--- /dev/null
+++ b/tests/sg/002

@@ -0,0 +1,38 @@
+#!/bin/bash
+#
+# TODO: provide a description of the test here, i.e., what it tests and how. If
+# this is a regression test for a patch, reference the patch title: