qemu/qemu-io-cmds.c

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/*
* Command line utility to exercise the QEMU I/O path.
*
* Copyright (C) 2009-2016 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 "qemu/osdep.h"
2016-03-14 11:01:28 +03:00
#include "qapi/error.h"
#include "qemu-io.h"
#include "sysemu/block-backend.h"
#include "block/block.h"
#include "block/block_int.h" /* for info_f() */
#include "block/qapi.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qemu/timer.h"
#include "qemu/cutils.h"
#define CMD_NOFILE_OK 0x01
bool qemuio_misalign;
static cmdinfo_t *cmdtab;
static int ncmds;
static int compare_cmdname(const void *a, const void *b)
{
return strcmp(((const cmdinfo_t *)a)->name,
((const cmdinfo_t *)b)->name);
}
void qemuio_add_command(const cmdinfo_t *ci)
{
/* ci->perm assumes a file is open, but the GLOBAL and NOFILE_OK
* flags allow it not to be, so that combination is invalid.
* Catch it now rather than letting it manifest as a crash if a
* particular set of command line options are used.
*/
assert(ci->perm == 0 ||
(ci->flags & (CMD_FLAG_GLOBAL | CMD_NOFILE_OK)) == 0);
cmdtab = g_renew(cmdinfo_t, cmdtab, ++ncmds);
cmdtab[ncmds - 1] = *ci;
qsort(cmdtab, ncmds, sizeof(*cmdtab), compare_cmdname);
}
int qemuio_command_usage(const cmdinfo_t *ci)
{
printf("%s %s -- %s\n", ci->name, ci->args, ci->oneline);
return 0;
}
static int init_check_command(BlockBackend *blk, const cmdinfo_t *ct)
{
if (ct->flags & CMD_FLAG_GLOBAL) {
return 1;
}
if (!(ct->flags & CMD_NOFILE_OK) && !blk) {
fprintf(stderr, "no file open, try 'help open'\n");
return 0;
}
return 1;
}
static int command(BlockBackend *blk, const cmdinfo_t *ct, int argc,
char **argv)
{
char *cmd = argv[0];
if (!init_check_command(blk, ct)) {
return 0;
}
if (argc - 1 < ct->argmin || (ct->argmax != -1 && argc - 1 > ct->argmax)) {
if (ct->argmax == -1) {
fprintf(stderr,
"bad argument count %d to %s, expected at least %d arguments\n",
argc-1, cmd, ct->argmin);
} else if (ct->argmin == ct->argmax) {
fprintf(stderr,
"bad argument count %d to %s, expected %d arguments\n",
argc-1, cmd, ct->argmin);
} else {
fprintf(stderr,
"bad argument count %d to %s, expected between %d and %d arguments\n",
argc-1, cmd, ct->argmin, ct->argmax);
}
return 0;
}
/* Request additional permissions if necessary for this command. The caller
* is responsible for restoring the original permissions afterwards if this
* is what it wants. */
if (ct->perm && blk_is_available(blk)) {
uint64_t orig_perm, orig_shared_perm;
blk_get_perm(blk, &orig_perm, &orig_shared_perm);
if (ct->perm & ~orig_perm) {
uint64_t new_perm;
Error *local_err = NULL;
int ret;
new_perm = orig_perm | ct->perm;
ret = blk_set_perm(blk, new_perm, orig_shared_perm, &local_err);
if (ret < 0) {
error_report_err(local_err);
return 0;
}
}
}
optind = 0;
return ct->cfunc(blk, argc, argv);
}
static const cmdinfo_t *find_command(const char *cmd)
{
cmdinfo_t *ct;
for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) {
if (strcmp(ct->name, cmd) == 0 ||
(ct->altname && strcmp(ct->altname, cmd) == 0))
{
return (const cmdinfo_t *)ct;
}
}
return NULL;
}
/* Invoke fn() for commands with a matching prefix */
void qemuio_complete_command(const char *input,
void (*fn)(const char *cmd, void *opaque),
void *opaque)
{
cmdinfo_t *ct;
size_t input_len = strlen(input);
for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) {
if (strncmp(input, ct->name, input_len) == 0) {
fn(ct->name, opaque);
}
}
}
static char **breakline(char *input, int *count)
{
int c = 0;
char *p;
char **rval = g_new0(char *, 1);
while (rval && (p = qemu_strsep(&input, " ")) != NULL) {
if (!*p) {
continue;
}
c++;
rval = g_renew(char *, rval, (c + 1));
rval[c - 1] = p;
rval[c] = NULL;
}
*count = c;
return rval;
}
static int64_t cvtnum(const char *s)
{
int err;
uint64_t value;
err = qemu_strtosz(s, NULL, &value);
if (err < 0) {
return err;
}
if (value > INT64_MAX) {
return -ERANGE;
}
return value;
}
static void print_cvtnum_err(int64_t rc, const char *arg)
{
switch (rc) {
case -EINVAL:
printf("Parsing error: non-numeric argument,"
" or extraneous/unrecognized suffix -- %s\n", arg);
break;
case -ERANGE:
printf("Parsing error: argument too large -- %s\n", arg);
break;
default:
printf("Parsing error: %s\n", arg);
}
}
#define EXABYTES(x) ((long long)(x) << 60)
#define PETABYTES(x) ((long long)(x) << 50)
#define TERABYTES(x) ((long long)(x) << 40)
#define GIGABYTES(x) ((long long)(x) << 30)
#define MEGABYTES(x) ((long long)(x) << 20)
#define KILOBYTES(x) ((long long)(x) << 10)
#define TO_EXABYTES(x) ((x) / EXABYTES(1))
#define TO_PETABYTES(x) ((x) / PETABYTES(1))
#define TO_TERABYTES(x) ((x) / TERABYTES(1))
#define TO_GIGABYTES(x) ((x) / GIGABYTES(1))
#define TO_MEGABYTES(x) ((x) / MEGABYTES(1))
#define TO_KILOBYTES(x) ((x) / KILOBYTES(1))
static void cvtstr(double value, char *str, size_t size)
{
char *trim;
const char *suffix;
if (value >= EXABYTES(1)) {
suffix = " EiB";
snprintf(str, size - 4, "%.3f", TO_EXABYTES(value));
} else if (value >= PETABYTES(1)) {
suffix = " PiB";
snprintf(str, size - 4, "%.3f", TO_PETABYTES(value));
} else if (value >= TERABYTES(1)) {
suffix = " TiB";
snprintf(str, size - 4, "%.3f", TO_TERABYTES(value));
} else if (value >= GIGABYTES(1)) {
suffix = " GiB";
snprintf(str, size - 4, "%.3f", TO_GIGABYTES(value));
} else if (value >= MEGABYTES(1)) {
suffix = " MiB";
snprintf(str, size - 4, "%.3f", TO_MEGABYTES(value));
} else if (value >= KILOBYTES(1)) {
suffix = " KiB";
snprintf(str, size - 4, "%.3f", TO_KILOBYTES(value));
} else {
suffix = " bytes";
snprintf(str, size - 6, "%f", value);
}
trim = strstr(str, ".000");
if (trim) {
strcpy(trim, suffix);
} else {
strcat(str, suffix);
}
}
static struct timeval tsub(struct timeval t1, struct timeval t2)
{
t1.tv_usec -= t2.tv_usec;
if (t1.tv_usec < 0) {
t1.tv_usec += 1000000;
t1.tv_sec--;
}
t1.tv_sec -= t2.tv_sec;
return t1;
}
static double tdiv(double value, struct timeval tv)
{
return value / ((double)tv.tv_sec + ((double)tv.tv_usec / 1000000.0));
}
#define HOURS(sec) ((sec) / (60 * 60))
#define MINUTES(sec) (((sec) % (60 * 60)) / 60)
#define SECONDS(sec) ((sec) % 60)
enum {
DEFAULT_TIME = 0x0,
TERSE_FIXED_TIME = 0x1,
VERBOSE_FIXED_TIME = 0x2,
};
static void timestr(struct timeval *tv, char *ts, size_t size, int format)
{
double usec = (double)tv->tv_usec / 1000000.0;
if (format & TERSE_FIXED_TIME) {
if (!HOURS(tv->tv_sec)) {
snprintf(ts, size, "%u:%02u.%02u",
(unsigned int) MINUTES(tv->tv_sec),
(unsigned int) SECONDS(tv->tv_sec),
(unsigned int) (usec * 100));
return;
}
format |= VERBOSE_FIXED_TIME; /* fallback if hours needed */
}
if ((format & VERBOSE_FIXED_TIME) || tv->tv_sec) {
snprintf(ts, size, "%u:%02u:%02u.%02u",
(unsigned int) HOURS(tv->tv_sec),
(unsigned int) MINUTES(tv->tv_sec),
(unsigned int) SECONDS(tv->tv_sec),
(unsigned int) (usec * 100));
} else {
snprintf(ts, size, "0.%04u sec", (unsigned int) (usec * 10000));
}
}
/*
* Parse the pattern argument to various sub-commands.
*
* Because the pattern is used as an argument to memset it must evaluate
* to an unsigned integer that fits into a single byte.
*/
static int parse_pattern(const char *arg)
{
char *endptr = NULL;
long pattern;
pattern = strtol(arg, &endptr, 0);
if (pattern < 0 || pattern > UCHAR_MAX || *endptr != '\0') {
printf("%s is not a valid pattern byte\n", arg);
return -1;
}
return pattern;
}
/*
* 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(BlockBackend *blk, size_t len, int pattern)
{
void *buf;
if (qemuio_misalign) {
len += MISALIGN_OFFSET;
}
buf = blk_blockalign(blk, len);
memset(buf, pattern, len);
if (qemuio_misalign) {
buf += MISALIGN_OFFSET;
}
return buf;
}
static void qemu_io_free(void *p)
{
if (qemuio_misalign) {
p -= MISALIGN_OFFSET;
}
qemu_vfree(p);
}
static void dump_buffer(const void *buffer, int64_t offset, int64_t len)
{
uint64_t i;
int j;
const uint8_t *p;
for (i = 0, p = buffer; i < len; i += 16) {
const uint8_t *s = p;
printf("%08" PRIx64 ": ", 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(*s)) {
printf("%c", *s);
} else {
printf(".");
}
}
printf("\n");
}
}
static void print_report(const char *op, struct timeval *t, int64_t offset,
int64_t count, int64_t total, int cnt, bool 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 %"PRId64"/%"PRId64" bytes at offset %" PRId64 "\n",
op, total, count, 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("%"PRId64",%d,%s,%.3f,%.3f\n",
total, cnt, ts,
tdiv((double)total, *t),
tdiv((double)cnt, *t));
}
}
/*
* Parse multiple length statements for vectored I/O, and construct an I/O
* vector matching it.
*/
static void *
create_iovec(BlockBackend *blk, QEMUIOVector *qiov, char **argv, int nr_iov,
int pattern)
{
size_t *sizes = g_new0(size_t, nr_iov);
size_t count = 0;
void *buf = NULL;
void *p;
int i;
for (i = 0; i < nr_iov; i++) {
char *arg = argv[i];
int64_t len;
len = cvtnum(arg);
if (len < 0) {
print_cvtnum_err(len, arg);
goto fail;
}
if (len > BDRV_REQUEST_MAX_BYTES) {
printf("Argument '%s' exceeds maximum size %" PRIu64 "\n", arg,
(uint64_t)BDRV_REQUEST_MAX_BYTES);
goto fail;
}
if (count > BDRV_REQUEST_MAX_BYTES - len) {
printf("The total number of bytes exceed the maximum size %" PRIu64
"\n", (uint64_t)BDRV_REQUEST_MAX_BYTES);
goto fail;
}
sizes[i] = len;
count += len;
}
qemu_iovec_init(qiov, nr_iov);
buf = p = qemu_io_alloc(blk, count, pattern);
for (i = 0; i < nr_iov; i++) {
qemu_iovec_add(qiov, p, sizes[i]);
p += sizes[i];
}
fail:
g_free(sizes);
return buf;
}
static int do_pread(BlockBackend *blk, char *buf, int64_t offset,
int64_t count, int64_t *total)
{
if (count > INT_MAX) {
return -ERANGE;
}
*total = blk_pread(blk, offset, (uint8_t *)buf, count);
if (*total < 0) {
return *total;
}
return 1;
}
static int do_pwrite(BlockBackend *blk, char *buf, int64_t offset,
int64_t count, int flags, int64_t *total)
{
if (count > INT_MAX) {
return -ERANGE;
}
*total = blk_pwrite(blk, offset, (uint8_t *)buf, count, flags);
if (*total < 0) {
return *total;
}
return 1;
}
typedef struct {
BlockBackend *blk;
int64_t offset;
int64_t count;
int64_t *total;
int flags;
int ret;
bool done;
} CoWriteZeroes;
static void coroutine_fn co_pwrite_zeroes_entry(void *opaque)
{
CoWriteZeroes *data = opaque;
data->ret = blk_co_pwrite_zeroes(data->blk, data->offset, data->count,
data->flags);
data->done = true;
if (data->ret < 0) {
*data->total = data->ret;
return;
}
*data->total = data->count;
}
static int do_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
int64_t count, int flags, int64_t *total)
{
Coroutine *co;
CoWriteZeroes data = {
.blk = blk,
.offset = offset,
.count = count,
.total = total,
.flags = flags,
.done = false,
};
if (count > INT_MAX) {
return -ERANGE;
}
co = qemu_coroutine_create(co_pwrite_zeroes_entry, &data);
qemu_coroutine_enter(co);
while (!data.done) {
aio_poll(blk_get_aio_context(blk), true);
}
if (data.ret < 0) {
return data.ret;
} else {
return 1;
}
}
static int do_write_compressed(BlockBackend *blk, char *buf, int64_t offset,
int64_t count, int64_t *total)
{
int ret;
if (count >> 9 > BDRV_REQUEST_MAX_SECTORS) {
return -ERANGE;
}
ret = blk_pwrite_compressed(blk, offset, buf, count);
if (ret < 0) {
return ret;
}
*total = count;
return 1;
}
static int do_load_vmstate(BlockBackend *blk, char *buf, int64_t offset,
int64_t count, int64_t *total)
{
if (count > INT_MAX) {
return -ERANGE;
}
*total = blk_load_vmstate(blk, (uint8_t *)buf, offset, count);
if (*total < 0) {
return *total;
}
return 1;
}
static int do_save_vmstate(BlockBackend *blk, char *buf, int64_t offset,
int64_t count, int64_t *total)
{
if (count > INT_MAX) {
return -ERANGE;
}
*total = blk_save_vmstate(blk, (uint8_t *)buf, offset, 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(BlockBackend *blk, QEMUIOVector *qiov,
int64_t offset, int *total)
{
int async_ret = NOT_DONE;
blk_aio_preadv(blk, offset, qiov, 0, aio_rw_done, &async_ret);
while (async_ret == NOT_DONE) {
main_loop_wait(false);
}
*total = qiov->size;
return async_ret < 0 ? async_ret : 1;
}
static int do_aio_writev(BlockBackend *blk, QEMUIOVector *qiov,
int64_t offset, int flags, int *total)
{
int async_ret = NOT_DONE;
blk_aio_pwritev(blk, offset, qiov, flags, aio_rw_done, &async_ret);
while (async_ret == NOT_DONE) {
main_loop_wait(false);
}
*total = qiov->size;
return async_ret < 0 ? async_ret : 1;
}
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"
" -b, -- read from the VM state rather than the virtual disk\n"
" -C, -- report statistics in a machine parsable format\n"
" -l, -- length for pattern verification (only with -P)\n"
" -p, -- ignored for backwards compatibility\n"
" -P, -- use a pattern to verify read data\n"
" -q, -- quiet mode, do not show I/O statistics\n"
" -s, -- start offset for pattern verification (only with -P)\n"
" -v, -- dump buffer to standard output\n"
"\n");
}
static int read_f(BlockBackend *blk, int argc, char **argv);
static const cmdinfo_t read_cmd = {
.name = "read",
.altname = "r",
.cfunc = read_f,
.argmin = 2,
.argmax = -1,
.args = "[-abCqv] [-P pattern [-s off] [-l len]] off len",
.oneline = "reads a number of bytes at a specified offset",
.help = read_help,
};
static int read_f(BlockBackend *blk, int argc, char **argv)
{
struct timeval t1, t2;
bool Cflag = false, qflag = false, vflag = false;
bool Pflag = false, sflag = false, lflag = false, bflag = false;
int c, cnt;
char *buf;
int64_t offset;
int64_t count;
/* Some compilers get confused and warn if this is not initialized. */
int64_t total = 0;
int pattern = 0;
int64_t pattern_offset = 0, pattern_count = 0;
while ((c = getopt(argc, argv, "bCl:pP:qs:v")) != -1) {
switch (c) {
case 'b':
bflag = true;
break;
case 'C':
Cflag = true;
break;
case 'l':
lflag = true;
pattern_count = cvtnum(optarg);
if (pattern_count < 0) {
print_cvtnum_err(pattern_count, optarg);
return 0;
}
break;
case 'p':
/* Ignored for backwards compatibility */
break;
case 'P':
Pflag = true;
pattern = parse_pattern(optarg);
if (pattern < 0) {
return 0;
}
break;
case 'q':
qflag = true;
break;
case 's':
sflag = true;
pattern_offset = cvtnum(optarg);
if (pattern_offset < 0) {
print_cvtnum_err(pattern_offset, optarg);
return 0;
}
break;
case 'v':
vflag = true;
break;
default:
return qemuio_command_usage(&read_cmd);
}
}
if (optind != argc - 2) {
return qemuio_command_usage(&read_cmd);
}
offset = cvtnum(argv[optind]);
if (offset < 0) {
print_cvtnum_err(offset, argv[optind]);
return 0;
}
optind++;
count = cvtnum(argv[optind]);
if (count < 0) {
print_cvtnum_err(count, argv[optind]);
return 0;