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qemu/qemu-img.c
Kevin Wolf 80ee15a6b2 qcow2: Increase maximum cluster size to 2 MB 
This patch increases the maximum qcow2 cluster size to 2 MB. Starting with 128k
clusters, L2 tables span 2 GB or more of virtual disk space, causing 32 bit
truncation and wraparound of signed integers. Therefore some variables need to
use a larger data type.

While being at reviewing data types, change some integers that are used for
array indices to unsigned. In some places they were checked against some upper
limit but not for negative values. This could avoid potential segfaults with
corrupted qcow2 images.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-10-05 09:32:52 -05:00

1069 lines
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/*
* QEMU disk image utility
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "qemu-option.h"
#include "osdep.h"
#include "block_int.h"
#include <stdio.h>
#ifdef _WIN32
#include <windows.h>
#endif
typedef struct img_cmd_t {
const char *name;
int (*handler)(int argc, char **argv);
} img_cmd_t;
/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
#define BRDV_O_FLAGS BDRV_O_CACHE_WB
static void QEMU_NORETURN error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "qemu-img: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
exit(1);
va_end(ap);
}
static void format_print(void *opaque, const char *name)
{
printf(" %s", name);
}
/* Please keep in synch with qemu-img.texi */
static void help(void)
{
printf("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
"usage: qemu-img command [command options]\n"
"QEMU disk image utility\n"
"\n"
"Command syntax:\n"
#define DEF(option, callback, arg_string) \
" " arg_string "\n"
#include "qemu-img-cmds.h"
#undef DEF
#undef GEN_DOCS
"\n"
"Command parameters:\n"
" 'filename' is a disk image filename\n"
" 'base_image' is the read-only disk image which is used as base for a copy on\n"
" write image; the copy on write image only stores the modified data\n"
" 'output_base_image' forces the output image to be created as a copy on write\n"
" image of the specified base image; 'output_base_image' should have the same\n"
" content as the input's base image, however the path, image format, etc may\n"
" differ\n"
" 'fmt' is the disk image format. It is guessed automatically in most cases\n"
" 'size' is the disk image size in kilobytes. Optional suffixes\n"
" 'M' (megabyte, 1024 * 1024) and 'G' (gigabyte, 1024 * 1024 * 1024) are\n"
" supported any 'k' or 'K' is ignored\n"
" 'output_filename' is the destination disk image filename\n"
" 'output_fmt' is the destination format\n"
" 'options' is a comma separated list of format specific options in a\n"
" name=value format. Use -o ? for an overview of the options supported by the\n"
" used format\n"
" '-c' indicates that target image must be compressed (qcow format only)\n"
" '-h' with or without a command shows this help and lists the supported formats\n"
"\n"
"Parameters to snapshot subcommand:\n"
" 'snapshot' is the name of the snapshot to create, apply or delete\n"
" '-a' applies a snapshot (revert disk to saved state)\n"
" '-c' creates a snapshot\n"
" '-d' deletes a snapshot\n"
" '-l' lists all snapshots in the given image\n"
);
printf("\nSupported formats:");
bdrv_iterate_format(format_print, NULL);
printf("\n");
exit(1);
}
#if defined(WIN32)
/* XXX: put correct support for win32 */
static int read_password(char *buf, int buf_size)
{
int c, i;
printf("Password: ");
fflush(stdout);
i = 0;
for(;;) {
c = getchar();
if (c == '\n')
break;
if (i < (buf_size - 1))
buf[i++] = c;
}
buf[i] = '\0';
return 0;
}
#else
#include <termios.h>
static struct termios oldtty;
static void term_exit(void)
{
tcsetattr (0, TCSANOW, &oldtty);
}
static void term_init(void)
{
struct termios tty;
tcgetattr (0, &tty);
oldtty = tty;
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
|INLCR|IGNCR|ICRNL|IXON);
tty.c_oflag |= OPOST;
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
tty.c_cflag &= ~(CSIZE|PARENB);
tty.c_cflag |= CS8;
tty.c_cc[VMIN] = 1;
tty.c_cc[VTIME] = 0;
tcsetattr (0, TCSANOW, &tty);
atexit(term_exit);
}
static int read_password(char *buf, int buf_size)
{
uint8_t ch;
int i, ret;
printf("password: ");
fflush(stdout);
term_init();
i = 0;
for(;;) {
ret = read(0, &ch, 1);
if (ret == -1) {
if (errno == EAGAIN || errno == EINTR) {
continue;
} else {
ret = -1;
break;
}
} else if (ret == 0) {
ret = -1;
break;
} else {
if (ch == '\r') {
ret = 0;
break;
}
if (i < (buf_size - 1))
buf[i++] = ch;
}
}
term_exit();
buf[i] = '\0';
printf("\n");
return ret;
}
#endif
static BlockDriverState *bdrv_new_open(const char *filename,
const char *fmt)
{
BlockDriverState *bs;
BlockDriver *drv;
char password[256];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
error("Could not open '%s'", filename);
}
if (bdrv_is_encrypted(bs)) {
printf("Disk image '%s' is encrypted.\n", filename);
if (read_password(password, sizeof(password)) < 0)
error("No password given");
if (bdrv_set_key(bs, password) < 0)
error("invalid password");
}
return bs;
}
static void add_old_style_options(const char *fmt, QEMUOptionParameter *list,
int flags, const char *base_filename, const char *base_fmt)
{
if (flags & BLOCK_FLAG_ENCRYPT) {
if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) {
error("Encryption not supported for file format '%s'", fmt);
}
}
if (flags & BLOCK_FLAG_COMPAT6) {
if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) {
error("VMDK version 6 not supported for file format '%s'", fmt);
}
}
if (base_filename) {
if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
error("Backing file not supported for file format '%s'", fmt);
}
}
if (base_fmt) {
if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
error("Backing file format not supported for file format '%s'", fmt);
}
}
}
static int img_create(int argc, char **argv)
{
int c, ret, flags;
const char *fmt = "raw";
const char *base_fmt = NULL;
const char *filename;
const char *base_filename = NULL;
BlockDriver *drv;
QEMUOptionParameter *param = NULL;
char *options = NULL;
flags = 0;
for(;;) {
c = getopt(argc, argv, "F:b:f:he6o:");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'F':
base_fmt = optarg;
break;
case 'b':
base_filename = optarg;
break;
case 'f':
fmt = optarg;
break;
case 'e':
flags |= BLOCK_FLAG_ENCRYPT;
break;
case '6':
flags |= BLOCK_FLAG_COMPAT6;
break;
case 'o':
options = optarg;
break;
}
}
/* Find driver and parse its options */
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
if (options && !strcmp(options, "?")) {
print_option_help(drv->create_options);
return 0;
}
if (options) {
param = parse_option_parameters(options, drv->create_options, param);
if (param == NULL) {
error("Invalid options for file format '%s'.", fmt);
}
} else {
param = parse_option_parameters("", drv->create_options, param);
}
/* Get the filename */
if (optind >= argc)
help();
filename = argv[optind++];
/* Add size to parameters */
if (optind < argc) {
set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]);
}
/* Add old-style options to parameters */
add_old_style_options(fmt, param, flags, base_filename, base_fmt);
// The size for the image must always be specified, with one exception:
// If we are using a backing file, we can obtain the size from there
if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == 0) {
QEMUOptionParameter *backing_file =
get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
QEMUOptionParameter *backing_fmt =
get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
if (backing_file && backing_file->value.s) {
BlockDriverState *bs;
uint64_t size;
const char *fmt = NULL;
char buf[32];
if (backing_fmt && backing_fmt->value.s) {
if (bdrv_find_format(backing_fmt->value.s)) {
fmt = backing_fmt->value.s;
} else {
error("Unknown backing file format '%s'",
backing_fmt->value.s);
}
}
bs = bdrv_new_open(backing_file->value.s, fmt);
bdrv_get_geometry(bs, &size);
size *= 512;
bdrv_delete(bs);
snprintf(buf, sizeof(buf), "%" PRId64, size);
set_option_parameter(param, BLOCK_OPT_SIZE, buf);
} else {
error("Image creation needs a size parameter");
}
}
printf("Formatting '%s', fmt=%s ", filename, fmt);
print_option_parameters(param);
puts("");
ret = bdrv_create(drv, filename, param);
free_option_parameters(param);
if (ret < 0) {
if (ret == -ENOTSUP) {
error("Formatting or formatting option not supported for file format '%s'", fmt);
} else if (ret == -EFBIG) {
error("The image size is too large for file format '%s'", fmt);
} else {
error("Error while formatting");
}
}
return 0;
}
static int img_check(int argc, char **argv)
{
int c, ret;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
fmt = NULL;
for(;;) {
c = getopt(argc, argv, "f:h");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
}
}
if (optind >= argc)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
error("Could not open '%s'", filename);
}
ret = bdrv_check(bs);
switch(ret) {
case 0:
printf("No errors were found on the image.\n");
break;
case -ENOTSUP:
error("This image format does not support checks");
break;
default:
if (ret < 0) {
error("An error occurred during the check");
} else {
printf("%d errors were found on the image.\n", ret);
}
break;
}
bdrv_delete(bs);
return 0;
}
static int img_commit(int argc, char **argv)
{
int c, ret;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
fmt = NULL;
for(;;) {
c = getopt(argc, argv, "f:h");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
}
}
if (optind >= argc)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
error("Could not open '%s'", filename);
}
ret = bdrv_commit(bs);
switch(ret) {
case 0:
printf("Image committed.\n");
break;
case -ENOENT:
error("No disk inserted");
break;
case -EACCES:
error("Image is read-only");
break;
case -ENOTSUP:
error("Image is already committed");
break;
default:
error("Error while committing image");
break;
}
bdrv_delete(bs);
return 0;
}
static int is_not_zero(const uint8_t *sector, int len)
{
int i;
len >>= 2;
for(i = 0;i < len; i++) {
if (((uint32_t *)sector)[i] != 0)
return 1;
}
return 0;
}
/*
* Returns true iff the first sector pointed to by 'buf' contains at least
* a non-NUL byte.
*
* 'pnum' is set to the number of sectors (including and immediately following
* the first one) that are known to be in the same allocated/unallocated state.
*/
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
{
int v, i;
if (n <= 0) {
*pnum = 0;
return 0;
}
v = is_not_zero(buf, 512);
for(i = 1; i < n; i++) {
buf += 512;
if (v != is_not_zero(buf, 512))
break;
}
*pnum = i;
return v;
}
#define IO_BUF_SIZE (2 * 1024 * 1024)
static int img_convert(int argc, char **argv)
{
int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
const char *fmt, *out_fmt, *out_baseimg, *out_filename;
BlockDriver *drv;
BlockDriverState **bs, *out_bs;
int64_t total_sectors, nb_sectors, sector_num, bs_offset;
uint64_t bs_sectors;
uint8_t buf[IO_BUF_SIZE];
const uint8_t *buf1;
BlockDriverInfo bdi;
QEMUOptionParameter *param = NULL;
char *options = NULL;
fmt = NULL;
out_fmt = "raw";
out_baseimg = NULL;
flags = 0;
for(;;) {
c = getopt(argc, argv, "f:O:B:hce6o:");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
case 'O':
out_fmt = optarg;
break;
case 'B':
out_baseimg = optarg;
break;
case 'c':
flags |= BLOCK_FLAG_COMPRESS;
break;
case 'e':
flags |= BLOCK_FLAG_ENCRYPT;
break;
case '6':
flags |= BLOCK_FLAG_COMPAT6;
break;
case 'o':
options = optarg;
break;
}
}
bs_n = argc - optind - 1;
if (bs_n < 1) help();
out_filename = argv[argc - 1];
if (bs_n > 1 && out_baseimg)
error("-B makes no sense when concatenating multiple input images");
bs = calloc(bs_n, sizeof(BlockDriverState *));
if (!bs)
error("Out of memory");
total_sectors = 0;
for (bs_i = 0; bs_i < bs_n; bs_i++) {
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);
if (!bs[bs_i])
error("Could not open '%s'", argv[optind + bs_i]);
bdrv_get_geometry(bs[bs_i], &bs_sectors);
total_sectors += bs_sectors;
}
/* Find driver and parse its options */
drv = bdrv_find_format(out_fmt);
if (!drv)
error("Unknown file format '%s'", out_fmt);
if (options && !strcmp(options, "?")) {
print_option_help(drv->create_options);
return 0;
}
if (options) {
param = parse_option_parameters(options, drv->create_options, param);
if (param == NULL) {
error("Invalid options for file format '%s'.", out_fmt);
}
} else {
param = parse_option_parameters("", drv->create_options, param);
}
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
/* Check if compression is supported */
if (flags & BLOCK_FLAG_COMPRESS) {
QEMUOptionParameter *encryption =
get_option_parameter(param, BLOCK_OPT_ENCRYPT);
if (!drv->bdrv_write_compressed) {
error("Compression not supported for this file format");
}
if (encryption && encryption->value.n) {
error("Compression and encryption not supported at the same time");
}
}
/* Create the new image */
ret = bdrv_create(drv, out_filename, param);
free_option_parameters(param);
if (ret < 0) {
if (ret == -ENOTSUP) {
error("Formatting not supported for file format '%s'", out_fmt);
} else if (ret == -EFBIG) {
error("The image size is too large for file format '%s'", out_fmt);
} else {
error("Error while formatting '%s'", out_filename);
}
}
out_bs = bdrv_new_open(out_filename, out_fmt);
bs_i = 0;
bs_offset = 0;
bdrv_get_geometry(bs[0], &bs_sectors);
if (flags & BLOCK_FLAG_COMPRESS) {
if (bdrv_get_info(out_bs, &bdi) < 0)
error("could not get block driver info");
cluster_size = bdi.cluster_size;
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
error("invalid cluster size");
cluster_sectors = cluster_size >> 9;
sector_num = 0;
for(;;) {
int64_t bs_num;
int remainder;
uint8_t *buf2;
nb_sectors = total_sectors - sector_num;
if (nb_sectors <= 0)
break;
if (nb_sectors >= cluster_sectors)
n = cluster_sectors;
else
n = nb_sectors;
bs_num = sector_num - bs_offset;
assert (bs_num >= 0);
remainder = n;
buf2 = buf;
while (remainder > 0) {
int nlow;
while (bs_num == bs_sectors) {
bs_i++;
assert (bs_i < bs_n);
bs_offset += bs_sectors;
bdrv_get_geometry(bs[bs_i], &bs_sectors);
bs_num = 0;
/* printf("changing part: sector_num=%lld, "
"bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
sector_num, bs_i, bs_offset, bs_sectors); */
}
assert (bs_num < bs_sectors);
nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;
if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0)
error("error while reading");
buf2 += nlow * 512;
bs_num += nlow;
remainder -= nlow;
}
assert (remainder == 0);
if (n < cluster_sectors)
memset(buf + n * 512, 0, cluster_size - n * 512);
if (is_not_zero(buf, cluster_size)) {
if (bdrv_write_compressed(out_bs, sector_num, buf,
cluster_sectors) != 0)
error("error while compressing sector %" PRId64,
sector_num);
}
sector_num += n;
}
/* signal EOF to align */
bdrv_write_compressed(out_bs, 0, NULL, 0);
} else {
sector_num = 0; // total number of sectors converted so far
for(;;) {
nb_sectors = total_sectors - sector_num;
if (nb_sectors <= 0)
break;
if (nb_sectors >= (IO_BUF_SIZE / 512))
n = (IO_BUF_SIZE / 512);
else
n = nb_sectors;
while (sector_num - bs_offset >= bs_sectors) {
bs_i ++;
assert (bs_i < bs_n);
bs_offset += bs_sectors;
bdrv_get_geometry(bs[bs_i], &bs_sectors);
/* printf("changing part: sector_num=%lld, bs_i=%d, "
"bs_offset=%lld, bs_sectors=%lld\n",
sector_num, bs_i, bs_offset, bs_sectors); */
}
if (n > bs_offset + bs_sectors - sector_num)
n = bs_offset + bs_sectors - sector_num;
if (strcmp(drv->format_name, "host_device")) {
/* If the output image is being created as a copy on write image,
assume that sectors which are unallocated in the input image
are present in both the output's and input's base images (no
need to copy them). */
if (out_baseimg) {
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
n, &n1)) {
sector_num += n1;
continue;
}
/* The next 'n1' sectors are allocated in the input image. Copy
only those as they may be followed by unallocated sectors. */
n = n1;
}
} else {
n1 = n;
}
if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0)
error("error while reading");
/* NOTE: at the same time we convert, we do not write zero
sectors to have a chance to compress the image. Ideally, we
should add a specific call to have the info to go faster */
buf1 = buf;
while (n > 0) {
/* If the output image is being created as a copy on write image,
copy all sectors even the ones containing only NUL bytes,
because they may differ from the sectors in the base image.
If the output is to a host device, we also write out
sectors that are entirely 0, since whatever data was
already there is garbage, not 0s. */
if (strcmp(drv->format_name, "host_device") == 0 || out_baseimg ||
is_allocated_sectors(buf1, n, &n1)) {
if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
error("error while writing");
}
sector_num += n1;
n -= n1;
buf1 += n1 * 512;
}
}
}
bdrv_delete(out_bs);
for (bs_i = 0; bs_i < bs_n; bs_i++)
bdrv_delete(bs[bs_i]);
free(bs);
return 0;
}
#ifdef _WIN32
static int64_t get_allocated_file_size(const char *filename)
{
typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
get_compressed_t get_compressed;
struct _stati64 st;
/* WinNT support GetCompressedFileSize to determine allocate size */
get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");
if (get_compressed) {
DWORD high, low;
low = get_compressed(filename, &high);
if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)
return (((int64_t) high) << 32) + low;
}
if (_stati64(filename, &st) < 0)
return -1;
return st.st_size;
}
#else
static int64_t get_allocated_file_size(const char *filename)
{
struct stat st;
if (stat(filename, &st) < 0)
return -1;
return (int64_t)st.st_blocks * 512;
}
#endif
static void dump_snapshots(BlockDriverState *bs)
{
QEMUSnapshotInfo *sn_tab, *sn;
int nb_sns, i;
char buf[256];
nb_sns = bdrv_snapshot_list(bs, &sn_tab);
if (nb_sns <= 0)
return;
printf("Snapshot list:\n");
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
for(i = 0; i < nb_sns; i++) {
sn = &sn_tab[i];
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
}
qemu_free(sn_tab);
}
static int img_info(int argc, char **argv)
{
int c;
const char *filename, *fmt;
BlockDriver *drv;
BlockDriverState *bs;
char fmt_name[128], size_buf[128], dsize_buf[128];
uint64_t total_sectors;
int64_t allocated_size;
char backing_filename[1024];
char backing_filename2[1024];
BlockDriverInfo bdi;
fmt = NULL;
for(;;) {
c = getopt(argc, argv, "f:h");
if (c == -1)
break;
switch(c) {
case 'h':
help();
break;
case 'f':
fmt = optarg;
break;
}
}
if (optind >= argc)
help();
filename = argv[optind++];
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (fmt) {
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
} else {
drv = NULL;
}
if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
error("Could not open '%s'", filename);
}
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
bdrv_get_geometry(bs, &total_sectors);
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
allocated_size = get_allocated_file_size(filename);
if (allocated_size < 0)
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
else
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
allocated_size);
printf("image: %s\n"
"file format: %s\n"
"virtual size: %s (%" PRId64 " bytes)\n"
"disk size: %s\n",
filename, fmt_name, size_buf,
(total_sectors * 512),
dsize_buf);
if (bdrv_is_encrypted(bs))
printf("encrypted: yes\n");
if (bdrv_get_info(bs, &bdi) >= 0) {
if (bdi.cluster_size != 0)
printf("cluster_size: %d\n", bdi.cluster_size);
}
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
if (backing_filename[0] != '\0') {
path_combine(backing_filename2, sizeof(backing_filename2),
filename, backing_filename);
printf("backing file: %s (actual path: %s)\n",
backing_filename,
backing_filename2);
}
dump_snapshots(bs);
bdrv_delete(bs);
return 0;
}
#define SNAPSHOT_LIST 1
#define SNAPSHOT_CREATE 2
#define SNAPSHOT_APPLY 3
#define SNAPSHOT_DELETE 4
static int img_snapshot(int argc, char **argv)
{
BlockDriverState *bs;
QEMUSnapshotInfo sn;
char *filename, *snapshot_name = NULL;
int c, ret;
int action = 0;
qemu_timeval tv;
/* Parse commandline parameters */
for(;;) {
c = getopt(argc, argv, "la:c:d:h");
if (c == -1)
break;
switch(c) {
case 'h':
help();
return 0;
case 'l':
if (action) {
help();
return 0;
}
action = SNAPSHOT_LIST;
break;
case 'a':
if (action) {
help();
return 0;
}
action = SNAPSHOT_APPLY;
snapshot_name = optarg;
break;
case 'c':
if (action) {
help();
return 0;
}
action = SNAPSHOT_CREATE;
snapshot_name = optarg;
break;
case 'd':
if (action) {
help();
return 0;
}
action = SNAPSHOT_DELETE;
snapshot_name = optarg;
break;
}
}
if (optind >= argc)
help();
filename = argv[optind++];
/* Open the image */
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (bdrv_open2(bs, filename, 0, NULL) < 0) {
error("Could not open '%s'", filename);
}
/* Perform the requested action */
switch(action) {
case SNAPSHOT_LIST:
dump_snapshots(bs);
break;
case SNAPSHOT_CREATE:
memset(&sn, 0, sizeof(sn));
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
qemu_gettimeofday(&tv);
sn.date_sec = tv.tv_sec;
sn.date_nsec = tv.tv_usec * 1000;
ret = bdrv_snapshot_create(bs, &sn);
if (ret)
error("Could not create snapshot '%s': %d (%s)",
snapshot_name, ret, strerror(-ret));
break;
case SNAPSHOT_APPLY:
ret = bdrv_snapshot_goto(bs, snapshot_name);
if (ret)
error("Could not apply snapshot '%s': %d (%s)",
snapshot_name, ret, strerror(-ret));
break;
case SNAPSHOT_DELETE:
ret = bdrv_snapshot_delete(bs, snapshot_name);
if (ret)
error("Could not delete snapshot '%s': %d (%s)",
snapshot_name, ret, strerror(-ret));
break;
}
/* Cleanup */
bdrv_delete(bs);
return 0;
}
static const img_cmd_t img_cmds[] = {
#define DEF(option, callback, arg_string) \
{ option, callback },
#include "qemu-img-cmds.h"
#undef DEF
#undef GEN_DOCS
{ NULL, NULL, },
};
int main(int argc, char **argv)
{
const img_cmd_t *cmd;
const char *cmdname;
bdrv_init();
if (argc < 2)
help();
cmdname = argv[1];
argc--; argv++;
/* find the command */
for(cmd = img_cmds; cmd->name != NULL; cmd++) {
if (!strcmp(cmdname, cmd->name)) {
return cmd->handler(argc, argv);
}
}
/* not found */
help();
return 0;
}
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