Add files not included in previous commit.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6995 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 1074 insertions, 0 deletions

diff --git a/qemu-io.c b/qemu-io.c
new file mode 100644
index 0000000..466d22c
--- /dev/null
+++ b/qemu-io.c
@@ -0,0 +1,1074 @@
+/*
+ * Command line utility to exercise the QEMU I/O path.
+ *
+ * Copyright (C) 2009 Red Hat, Inc.
+ * Copyright (c) 2003-2005 Silicon Graphics, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#include <sys/types.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <getopt.h>
+
+#include "qemu-common.h"
+#include "block_int.h"
+#include "cmd.h"
+
+#define VERSION	"0.0.1"
+
+#define CMD_NOFILE_OK	0x01
+
+char *progname;
+static BlockDriverState *bs;
+
+static int misalign;
+
+/*
+ * Memory allocation helpers.
+ *
+ * Make sure memory is aligned by default, or purposefully misaligned if
+ * that is specified on the command line.
+ */
+
+#define MISALIGN_OFFSET		16
+static void *qemu_io_alloc(size_t len, int pattern)
+{
+	void *buf;
+
+	if (misalign)
+		len += MISALIGN_OFFSET;
+	buf = qemu_memalign(512, len);
+	memset(buf, pattern, len);
+	if (misalign)
+		buf += MISALIGN_OFFSET;
+	return buf;
+}
+
+static void qemu_io_free(void *p)
+{
+	if (misalign)
+		p -= MISALIGN_OFFSET;
+	qemu_vfree(p);
+}
+
+static void
+dump_buffer(char *buffer, int64_t offset, int len)
+{
+	int i, j;
+	char *p;
+
+	for (i = 0, p = buffer; i < len; i += 16) {
+		char    *s = p;
+
+		printf("%08llx:  ", (unsigned long long)offset + i);
+		for (j = 0; j < 16 && i + j < len; j++, p++)
+			printf("%02x ", *p);
+		printf(" ");
+		for (j = 0; j < 16 && i + j < len; j++, s++) {
+			if (isalnum((int)*s))
+				printf("%c", *s);
+			else
+				printf(".");
+		}
+		printf("\n");
+	}
+}
+
+static void
+print_report(const char *op, struct timeval *t, int64_t offset,
+		int count, int total, int cnt, int Cflag)
+{
+	char s1[64], s2[64], ts[64];
+
+	timestr(t, ts, sizeof(ts), Cflag ? VERBOSE_FIXED_TIME : 0);
+	if (!Cflag) {
+		cvtstr((double)total, s1, sizeof(s1));
+		cvtstr(tdiv((double)total, *t), s2, sizeof(s2));
+		printf("%s %d/%d bytes at offset %lld\n",
+			op, total, count, (long long)offset);
+		printf("%s, %d ops; %s (%s/sec and %.4f ops/sec)\n",
+			s1, cnt, ts, s2, tdiv((double)cnt, *t));
+	} else {/* bytes,ops,time,bytes/sec,ops/sec */
+		printf("%d,%d,%s,%.3f,%.3f\n",
+			total, cnt, ts,
+			tdiv((double)total, *t),
+			tdiv((double)cnt, *t));
+	}
+}
+
+static int do_read(char *buf, int64_t offset, int count, int *total)
+{
+	int ret;
+
+	ret = bdrv_read(bs, offset >> 9, (uint8_t *)buf, count >> 9);
+	if (ret < 0)
+		return ret;
+	*total = count;
+	return 1;
+}
+
+static int do_write(char *buf, int64_t offset, int count, int *total)
+{
+	int ret;
+
+	ret = bdrv_write(bs, offset >> 9, (uint8_t *)buf, count >> 9);
+	if (ret < 0)
+		return ret;
+	*total = count;
+	return 1;
+}
+
+static int do_pread(char *buf, int64_t offset, int count, int *total)
+{
+	*total = bdrv_pread(bs, offset, (uint8_t *)buf, count);
+	if (*total < 0)
+		return *total;
+	return 1;
+}
+
+static int do_pwrite(char *buf, int64_t offset, int count, int *total)
+{
+	*total = bdrv_pwrite(bs, offset, (uint8_t *)buf, count);
+	if (*total < 0)
+		return *total;
+	return 1;
+}
+
+#define NOT_DONE 0x7fffffff
+static void aio_rw_done(void *opaque, int ret)
+{
+	*(int *)opaque = ret;
+}
+
+static int do_aio_readv(QEMUIOVector *qiov, int64_t offset, int *total)
+{
+	BlockDriverAIOCB *acb;
+	int async_ret = NOT_DONE;
+
+	acb = bdrv_aio_readv(bs, offset >> 9, qiov, qiov->size >> 9,
+			     aio_rw_done, &async_ret);
+	if (!acb)
+		return -EIO;
+
+	while (async_ret == NOT_DONE)
+		qemu_aio_wait();
+
+	*total = qiov->size;
+	return async_ret < 0 ? async_ret : 1;
+}
+
+static int do_aio_writev(QEMUIOVector *qiov, int64_t offset, int *total)
+{
+	BlockDriverAIOCB *acb;
+	int async_ret = NOT_DONE;
+
+	acb = bdrv_aio_writev(bs, offset >> 9, qiov, qiov->size >> 9,
+			      aio_rw_done, &async_ret);
+	if (!acb)
+		return -EIO;
+
+	while (async_ret == NOT_DONE)
+		qemu_aio_wait();
+
+	*total = qiov->size >> 9;
+	return async_ret < 0 ? async_ret : 1;
+}
+
+
+static const cmdinfo_t read_cmd;
+
+static void
+read_help(void)
+{
+	printf(
+"\n"
+" reads a range of bytes from the given offset\n"
+"\n"
+" Example:\n"
+" 'read -v 512 1k' - dumps 1 kilobyte read from 512 bytes into the file\n"
+"\n"
+" Reads a segment of the currently open file, optionally dumping it to the\n"
+" standard output stream (with -v option) for subsequent inspection.\n"
+" -p, -- use bdrv_pread to read the file\n"
+" -C, -- report statistics in a machine parsable format\n"
+" -v, -- dump buffer to standard output\n"
+" -q, -- quite mode, do not show I/O statistics\n"
+"\n");
+}
+
+static int
+read_f(int argc, char **argv)
+{
+	struct timeval t1, t2;
+	int Cflag = 0, pflag = 0, qflag = 0, vflag = 0;
+	int c, cnt;
+	char *buf;
+	int64_t offset;
+	int count, total;
+
+	while ((c = getopt(argc, argv, "Cpqv")) != EOF) {
+		switch (c) {
+		case 'C':
+			Cflag = 1;
+			break;
+		case 'p':
+			pflag = 1;
+			break;
+		case 'q':
+			qflag = 1;
+			break;
+		case 'v':
+			vflag = 1;
+			break;
+		default:
+			return command_usage(&read_cmd);
+		}
+	}
+
+	if (optind != argc - 2)
+		return command_usage(&read_cmd);
+
+	offset = cvtnum(argv[optind]);
+	if (offset < 0) {
+		printf("non-numeric length argument -- %s\n", argv[optind]);
+		return 0;
+	}
+
+	optind++;
+	count = cvtnum(argv[optind]);
+	if (count < 0) {
+		printf("non-numeric length argument -- %s\n", argv[optind]);
+		return 0;
+	}
+
+	if (!pflag)
+		if (offset & 0x1ff) {
+			printf("offset %lld is not sector aligned\n",
+				(long long)offset);
+			return 0;
+
+		if (count & 0x1ff) {
+			printf("count %d is not sector aligned\n",
+				count);
+			return 0;
+		}
+	}
+
+	buf = qemu_io_alloc(count, 0xab);
+
+	gettimeofday(&t1, NULL);
+	if (pflag)
+		cnt = do_pread(buf, offset, count, &total);
+	else
+		cnt = do_read(buf, offset, count, &total);
+	gettimeofday(&t2, NULL);
+
+	if (cnt < 0) {
+		printf("read failed: %s\n", strerror(-cnt));
+		return 0;
+	}
+
+	if (qflag)
+		return 0;
+
+        if (vflag)
+		dump_buffer(buf, offset, count);
+
+	/* Finally, report back -- -C gives a parsable format */
+	t2 = tsub(t2, t1);
+	print_report("read", &t2, offset, count, total, cnt, Cflag);
+
+	qemu_io_free(buf);
+
+	return 0;
+}
+
+static const cmdinfo_t read_cmd = {
+	.name		= "read",
+	.altname	= "r",
+	.cfunc		= read_f,
+	.argmin		= 2,
+	.argmax		= -1,
+	.args		= "[-aCpqv] off len",
+	.oneline	= "reads a number of bytes at a specified offset",
+	.help		= read_help,
+};
+
+static const cmdinfo_t readv_cmd;
+
+static void
+readv_help(void)
+{
+	printf(
+"\n"
+" reads a range of bytes from the given offset into multiple buffers\n"
+"\n"
+" Example:\n"
+" 'readv -v 512 1k 1k ' - dumps 2 kilobytes read from 512 bytes into the file\n"
+"\n"
+" Reads a segment of the currently open file, optionally dumping it to the\n"
+" standard output stream (with -v option) for subsequent inspection.\n"
+" Uses multiple iovec buffers if more than one byte range is specified.\n"
+" -C, -- report statistics in a machine parsable format\n"
+" -v, -- dump buffer to standard output\n"
+" -q, -- quite mode, do not show I/O statistics\n"
+"\n");
+}
+
+static int
+readv_f(int argc, char **argv)
+{
+	struct timeval t1, t2;
+	int Cflag = 0, qflag = 0, vflag = 0;
+	int c, cnt;
+	char *buf, *p;
+	int64_t offset;
+	int count = 0, total;
+	int nr_iov, i;
+	QEMUIOVector qiov;
+
+	while ((c = getopt(argc, argv, "Cqv")) != EOF) {
+		switch (c) {
+		case 'C':
+			Cflag = 1;
+			break;
+		case 'q':
+			qflag = 1;
+			break;
+		case 'v':
+			vflag = 1;
+			break;
+		default:
+			return command_usage(&readv_cmd);
+		}
+	}
+
+	if (optind > argc - 2)
+		return command_usage(&readv_cmd);
+
+
+	offset = cvtnum(argv[optind]);
+	if (offset < 0) {
+		printf("non-numeric length argument -- %s\n", argv[optind]);
+		return 0;
+	}
+	optind++;
+
+	if (offset & 0x1ff) {
+		printf("offset %lld is not sector aligned\n",
+			(long long)offset);
+		return 0;
+	}
+
+	if (count & 0x1ff) {
+		printf("count %d is not sector aligned\n",
+			count);
+		return 0;
+	}
+
+	for (i = optind; i < argc; i++) {
+	        size_t len;
+
+		len = cvtnum(argv[i]);
+		if (len < 0) {
+			printf("non-numeric length argument -- %s\n", argv[i]);
+			return 0;
+		}
+		count += len;
+	}
+
+	nr_iov = argc - optind;
+	qemu_iovec_init(&qiov, nr_iov);
+	buf = p = qemu_io_alloc(count, 0xab);
+	for (i = 0; i < nr_iov; i++) {
+	        size_t len;
+
+		len = cvtnum(argv[optind]);
+		if (len < 0) {
+			printf("non-numeric length argument -- %s\n",
+				argv[optind]);
+			return 0;
+		}
+
+		qemu_iovec_add(&qiov, p, len);
+		p += len;
+		optind++;
+	}
+
+	gettimeofday(&t1, NULL);
+	cnt = do_aio_readv(&qiov, offset, &total);
+	gettimeofday(&t2, NULL);
+
+	if (cnt < 0) {
+		printf("readv failed: %s\n", strerror(-cnt));
+		return 0;
+	}
+
+	if (qflag)
+		return 0;
+
+        if (vflag)
+		dump_buffer(buf, offset, qiov.size);
+
+	/* Finally, report back -- -C gives a parsable format */
+	t2 = tsub(t2, t1);
+	print_report("read", &t2, offset, qiov.size, total, cnt, Cflag);
+
+	qemu_io_free(buf);
+
+	return 0;
+}
+
+static const cmdinfo_t readv_cmd = {
+	.name		= "readv",
+	.cfunc		= readv_f,
+	.argmin		= 2,
+	.argmax		= -1,
+	.args		= "[-Cqv] off len [len..]",
+	.oneline	= "reads a number of bytes at a specified offset",
+	.help		= readv_help,
+};
+
+static const cmdinfo_t write_cmd;
+
+static void
+write_help(void)
+{
+	printf(
+"\n"
+" writes a range of bytes from the given offset\n"
+"\n"
+" Example:\n"
+" 'write 512 1k' - writes 1 kilobyte at 512 bytes into the open file\n"
+"\n"
+" Writes into a segment of the currently open file, using a buffer\n"
+" filled with a set pattern (0xcdcdcdcd).\n"
+" -p, -- use bdrv_pwrite to write the file\n"
+" -P, -- use different pattern to fill file\n"
+" -C, -- report statistics in a machine parsable format\n"
+" -q, -- quite mode, do not show I/O statistics\n"
+"\n");
+}
+
+static int
+write_f(int argc, char **argv)
+{
+	struct timeval t1, t2;
+	int Cflag = 0, pflag = 0, qflag = 0;
+	int c, cnt;
+	char *buf;
+	int64_t offset;
+	int count, total;
+	int pattern = 0xcd;
+
+	while ((c = getopt(argc, argv, "CpP:q")) != EOF) {
+		switch (c) {
+		case 'C':
+			Cflag = 1;
+			break;
+		case 'p':
+			pflag = 1;
+			break;
+		case 'P':
+			pattern = atoi(optarg);
+			break;
+		case 'q':
+			qflag = 1;
+			break;
+		default:
+			return command_usage(&write_cmd);
+		}
+	}
+
+	if (optind != argc - 2)
+		return command_usage(&write_cmd);
+
+	offset = cvtnum(argv[optind]);
+	if (offset < 0) {
+		printf("non-numeric length argument -- %s\n", argv[optind]);
+		return 0;
+	}
+
+	optind++;
+	count = cvtnum(argv[optind]);
+	if (count < 0) {
+		printf("non-numeric length argument -- %s\n", argv[optind]);
+		return 0;
+	}
+
+	if (!pflag) {
+		if (offset & 0x1ff) {
+			printf("offset %lld is not sector aligned\n",
+				(long long)offset);
+			return 0;
+		}
+
+		if (count & 0x1ff) {
+			printf("count %d is not sector aligned\n",
+				count);
+			return 0;
+		}
+	}
+
+	buf = qemu_io_alloc(count, pattern);
+
+	gettimeofday(&t1, NULL);
+	if (pflag)
+		cnt = do_pwrite(buf, offset, count, &total);
+	else
+		cnt = do_write(buf, offset, count, &total);
+	gettimeofday(&t2, NULL);
+
+	if (cnt < 0) {
+		printf("write failed: %s\n", strerror(-cnt));
+		return 0;
+	}
+
+	if (qflag)
+		return 0;
+
+	/* Finally, report back -- -C gives a parsable format */
+	t2 = tsub(t2, t1);
+	print_report("wrote", &t2, offset, count, total, cnt, Cflag);
+
+	qemu_io_free(buf);
+
+	return 0;
+}
+
+static const cmdinfo_t write_cmd = {
+	.name		= "write",
+	.altname	= "w",
+	.cfunc		= write_f,
+	.argmin		= 2,
+	.argmax		= -1,
+	.args		= "[-aCpq] [-P pattern ] off len",
+	.oneline	= "writes a number of bytes at a specified offset",
+	.help		= write_help,
+};
+
+static const cmdinfo_t writev_cmd;
+
+static void
+writev_help(void)
+{
+	printf(
+"\n"
+" writes a range of bytes from the given offset source from multiple buffers\n"
+"\n"
+" Example:\n"
+" 'write 512 1k 1k' - writes 2 kilobytes at 512 bytes into the open file\n"
+"\n"
+" Writes into a segment of the currently open file, using a buffer\n"
+" filled with a set pattern (0xcdcdcdcd).\n"
+" -P, -- use different pattern to fill file\n"
+" -C, -- report statistics in a machine parsable format\n"
+" -q, -- quite mode, do not show I/O statistics\n"
+"\n");
+}
+
+static int
+writev_f(int argc, char **argv)
+{
+	struct timeval t1, t2;
+	int Cflag = 0, qflag = 0;
+	int c, cnt;
+	char *buf, *p;
+	int64_t offset;
+	int count = 0, total;
+	int nr_iov, i;
+	int pattern = 0xcd;
+	QEMUIOVector qiov;
+
+	while ((c = getopt(argc, argv, "CqP:")) != EOF) {
+		switch (c) {
+		case 'C':
+			Cflag = 1;
+			break;
+		case 'q':
+			qflag = 1;
+			break;
+		case 'P':
+			pattern = atoi(optarg);
+			break;
+		default:
+			return command_usage(&writev_cmd);
+		}
+	}
+
+	if (optind > argc - 2)
+		return command_usage(&writev_cmd);
+
+	offset = cvtnum(argv[optind]);
+	if (offset < 0) {
+		printf("non-numeric length argument -- %s\n", argv[optind]);
+		return 0;
+	}
+	optind++;
+
+	if (offset & 0x1ff) {
+		printf("offset %lld is not sector aligned\n",
+			(long long)offset);
+		return 0;
+	}
+
+	if (count & 0x1ff) {
+		printf("count %d is not sector aligned\n",
+			count);
+		return 0;
+	}
+
+
+	for (i = optind; i < argc; i++) {
+	        size_t len;
+
+		len = cvtnum(argv[optind]);
+		if (len < 0) {
+			printf("non-numeric length argument -- %s\n", argv[i]);
+			return 0;
+		}
+		count += len;
+	}
+
+	nr_iov = argc - optind;
+	qemu_iovec_init(&qiov, nr_iov);
+	buf = p = qemu_io_alloc(count, 0xab);
+	for (i = 0; i < nr_iov; i++) {
+	        size_t len;
+
+		len = cvtnum(argv[optind]);
+		if (len < 0) {
+			printf("non-numeric length argument -- %s\n",
+				argv[optind]);
+			return 0;
+		}
+
+		qemu_iovec_add(&qiov, p, len);
+		p += len;
+		optind++;
+	}
+
+	gettimeofday(&t1, NULL);
+	cnt = do_aio_writev(&qiov, offset, &total);
+	gettimeofday(&t2, NULL);
+
+	if (cnt < 0) {
+		printf("writev failed: %s\n", strerror(-cnt));
+		return 0;
+	}
+
+	if (qflag)
+		return 0;
+
+	/* Finally, report back -- -C gives a parsable format */
+	t2 = tsub(t2, t1);
+	print_report("wrote", &t2, offset, qiov.size, total, cnt, Cflag);
+
+	qemu_io_free(buf);
+
+	return 0;
+}
+
+static const cmdinfo_t writev_cmd = {
+	.name		= "writev",
+	.cfunc		= writev_f,
+	.argmin		= 2,
+	.argmax		= -1,
+	.args		= "[-Cq] [-P pattern ] off len [len..]",
+	.oneline	= "writes a number of bytes at a specified offset",
+	.help		= writev_help,
+};
+
+static int
+flush_f(int argc, char **argv)
+{
+	bdrv_flush(bs);
+	return 0;
+}
+
+static const cmdinfo_t flush_cmd = {
+	.name		= "flush",
+	.altname	= "f",
+	.cfunc		= flush_f,
+	.oneline	= "flush all in-core file state to disk",
+};
+
+static int
+truncate_f(int argc, char **argv)
+{
+	int64_t offset;
+	int ret;
+
+	offset = cvtnum(argv[1]);
+	if (offset < 0) {
+		printf("non-numeric truncate argument -- %s\n", argv[1]);
+		return 0;
+	}
+
+	ret = bdrv_truncate(bs, offset);
+	if (ret < 0) {
+		printf("truncate: %s", strerror(ret));
+		return 0;
+	}
+
+	return 0;
+}
+
+static const cmdinfo_t truncate_cmd = {
+	.name		= "truncate",
+	.altname	= "t",
+	.cfunc		= truncate_f,
+	.argmin		= 1,
+	.argmax		= 1,
+	.args		= "off",
+	.oneline	= "truncates the current file at the given offset",
+};
+
+static int
+length_f(int argc, char **argv)
+{
+        int64_t size;
+	char s1[64];
+
+	size = bdrv_getlength(bs);
+	if (size < 0) {
+		printf("getlength: %s", strerror(size));
+		return 0;
+	}
+
+	cvtstr(size, s1, sizeof(s1));
+	printf("%s\n", s1);
+	return 0;
+}
+
+
+static const cmdinfo_t length_cmd = {
+	.name		= "length",
+	.altname	= "l",
+	.cfunc		= length_f,
+	.oneline	= "gets the length of the current file",
+};
+
+
+static int
+info_f(int argc, char **argv)
+{
+	BlockDriverInfo bdi;
+	char s1[64], s2[64];
+	int ret;
+
+	if (bs->drv && bs->drv->format_name)
+		printf("format name: %s\n", bs->drv->format_name);
+	if (bs->drv && bs->drv->protocol_name)
+		printf("format name: %s\n", bs->drv->protocol_name);
+
+	ret = bdrv_get_info(bs, &bdi);
+	if (ret)
+		return 0;
+
+	cvtstr(bdi.cluster_size, s1, sizeof(s1));
+	cvtstr(bdi.vm_state_offset, s2, sizeof(s2));
+
+	printf("cluster size: %s\n", s1);
+	printf("vm state offset: %s\n", s2);
+
+	return 0;
+}
+
+
+
+static const cmdinfo_t info_cmd = {
+	.name		= "info",
+	.altname	= "i",
+	.cfunc		= info_f,
+	.oneline	= "prints information about the current file",
+};
+
+static int
+alloc_f(int argc, char **argv)
+{
+	int64_t offset;
+	int nb_sectors;
+	char s1[64];
+	int num;
+	int ret;
+
+	offset = cvtnum(argv[1]);
+	if (offset & 0x1ff) {
+		printf("offset %lld is not sector aligned\n",
+			(long long)offset);
+		return 0;
+	}
+
+	if (argc == 3)
+		nb_sectors = cvtnum(argv[2]);
+	else
+		nb_sectors = 1;
+
+	ret = bdrv_is_allocated(bs, offset >> 9, nb_sectors, &num);
+	if (ret) {
+		printf("is_allocated: %s", strerror(ret));
+		return 0;
+	}
+
+	cvtstr(offset, s1, sizeof(s1));
+
+	if (nb_sectors == 1)
+		printf("sector allocated at offset %s\n", s1);
+	else
+		printf("%d/%d sectors allocated at offset %s\n",
+			num, nb_sectors, s1);
+	return 0;
+}
+
+static const cmdinfo_t alloc_cmd = {
+	.name		= "alloc",
+	.altname	= "a",
+	.argmin		= 1,
+	.argmax		= 2,
+	.cfunc		= alloc_f,
+	.args		= "off [sectors]",
+	.oneline	= "checks if a sector is present in the file",
+};
+
+static int
+close_f(int argc, char **argv)
+{
+	bdrv_close(bs);
+	bs = NULL;
+	return 0;
+}
+
+static const cmdinfo_t close_cmd = {
+	.name		= "close",
+	.altname	= "c",
+	.cfunc		= close_f,
+	.oneline	= "close the current open file",
+};
+
+static int openfile(char *name, int flags)
+{
+	if (bs) {
+		fprintf(stderr, "file open already, try 'help close'\n");
+		return 1;
+	}
+
+	bs = bdrv_new("hda");
+	if (!bs)
+		return 1;
+
+	if (bdrv_open(bs, name, flags) == -1) {
+		fprintf(stderr, "%s: can't open device %s\n", progname, name);
+		bs = NULL;
+		return 1;
+	}
+
+	return 0;
+}
+
+static void
+open_help(void)
+{
+	printf(
+"\n"
+" opens a new file in the requested mode\n"
+"\n"
+" Example:\n"
+" 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
+"\n"
+" Opens a file for subsequent use by all of the other qemu-io commands.\n"
+" -C, -- create new file if it doesn't exist\n"
+" -r, -- open file read-only\n"
+" -s, -- use snapshot file\n"
+" -n, -- disable host cache\n"
+"\n");
+}
+
+static const cmdinfo_t open_cmd;
+
+static int
+open_f(int argc, char **argv)
+{
+	int flags = 0;
+	int readonly = 0;
+	int c;
+
+	while ((c = getopt(argc, argv, "snCr")) != EOF) {
+		switch (c) {
+		case 's':
+			flags |= BDRV_O_SNAPSHOT;
+			break;
+		case 'n':
+			flags |= BDRV_O_NOCACHE;
+			break;
+		case 'C':
+			flags |= BDRV_O_CREAT;
+			break;
+		case 'r':
+			readonly = 1;
+			break;
+		default:
+			return command_usage(&open_cmd);
+		}
+	}
+
+	if (readonly)
+		flags |= BDRV_O_RDONLY;
+	else
+		flags |= BDRV_O_RDWR;
+
+	if (optind != argc - 1)
+		return command_usage(&open_cmd);
+
+	return openfile(argv[optind], flags);
+}
+
+static const cmdinfo_t open_cmd = {
+	.name		= "open",
+	.altname	= "o",
+	.cfunc		= open_f,
+	.argmin		= 1,
+	.argmax		= -1,
+	.flags		= CMD_NOFILE_OK,
+	.args		= "[-Crsn] [path]",
+	.oneline	= "open the file specified by path",
+	.help		= open_help,
+};
+
+static int
+init_args_command(
+        int     index)
+{
+	/* only one device allowed so far */
+	if (index >= 1)
+		return 0;
+	return ++index;
+}
+
+static int
+init_check_command(
+	const cmdinfo_t *ct)
+{
+	if (ct->flags & CMD_FLAG_GLOBAL)
+		return 1;
+	if (!(ct->flags & CMD_NOFILE_OK) && !bs) {
+		fprintf(stderr, "no file open, try 'help open'\n");
+		return 0;
+	}
+	return 1;
+}
+
+static void usage(const char *name)
+{
+	printf(
+"Usage: %s [-h] [-V] [-Crsnm] [-c cmd] ... [file]\n"
+"QEMU Disk excerciser\n"
+"\n"
+"  -C, --create         create new file if it doesn't exist\n"
+"  -c, --cmd            command to execute\n"
+"  -r, --read-only      export read-only\n"
+"  -s, --snapshot       use snapshot file\n"
+"  -n, --nocache        disable host cache\n"
+"  -m, --misalign       misalign allocations for O_DIRECT\n"
+"  -h, --help           display this help and exit\n"
+"  -V, --version        output version information and exit\n"
+"\n",
+	name);
+}
+
+
+int main(int argc, char **argv)
+{
+	int readonly = 0;
+	const char *sopt = "hVc:Crsnm";
+	struct option lopt[] = {
+		{ "help", 0, 0, 'h' },
+		{ "version", 0, 0, 'V' },
+		{ "offset", 1, 0, 'o' },
+		{ "cmd", 1, 0, 'c' },
+		{ "create", 0, 0, 'C' },
+		{ "read-only", 0, 0, 'r' },
+		{ "snapshot", 0, 0, 's' },
+		{ "nocache", 0, 0, 'n' },
+		{ "misalign", 0, 0, 'm' },
+		{ NULL, 0, 0, 0 }
+	};
+	int c;
+	int opt_index = 0;
+	int flags = 0;
+
+	progname = basename(argv[0]);
+
+	while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
+		switch (c) {
+		case 's':
+			flags |= BDRV_O_SNAPSHOT;
+			break;
+		case 'n':
+			flags |= BDRV_O_NOCACHE;
+			break;
+		case 'c':
+			add_user_command(optarg);
+			break;
+		case 'C':
+			flags |= BDRV_O_CREAT;
+			break;
+		case 'r':
+			readonly = 1;
+			break;
+		case 'm':
+			misalign = 1;
+			break;
+		case 'V':
+			printf("%s version %s\n", progname, VERSION);
+			exit(0);
+		case 'h':
+			usage(progname);
+			exit(0);
+		default:
+			usage(progname);
+			exit(1);
+		}
+	}
+
+	if ((argc - optind) > 1) {
+		usage(progname);
+		exit(1);
+	}
+
+	bdrv_init();
+
+	/* initialize commands */
+	quit_init();
+	help_init();
+	add_command(&open_cmd);
+	add_command(&close_cmd);
+	add_command(&read_cmd);
+	add_command(&readv_cmd);
+	add_command(&write_cmd);
+	add_command(&writev_cmd);
+	add_command(&flush_cmd);
+	add_command(&truncate_cmd);
+	add_command(&length_cmd);
+	add_command(&info_cmd);
+	add_command(&alloc_cmd);
+
+	add_args_command(init_args_command);
+	add_check_command(init_check_command);
+
+	/* open the device */
+	if (readonly)
+		flags |= BDRV_O_RDONLY;
+	else
+		flags |= BDRV_O_RDWR;
+
+	if ((argc - optind) == 1)
+		openfile(argv[optind], flags);
+	command_loop();
+
+	if (bs)
+		bdrv_close(bs);
+	return 0;
+}