* THE SOFTWARE.
*/
#include "qemu-common.h"
+#include "qemu-option.h"
+#include "osdep.h"
#include "block_int.h"
-#include <assert.h>
+#include <stdio.h>
#ifdef _WIN32
-#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
-static void __attribute__((noreturn)) error(const char *fmt, ...)
+/* 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);
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"
"QEMU disk image utility\n"
"\n"
"Command syntax:\n"
- " create [-e] [-6] [-b base_image] [-f fmt] filename [size]\n"
+ " check [-f fmt] filename\n"
+ " create [-e] [-6] [-F fmt] [-b base_image] [-f fmt] filename [size]\n"
" commit [-f fmt] filename\n"
- " convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] filename [filename2 [...]] output_filename\n"
+ " convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] [-B output_base_image] filename [filename2 [...]] output_filename\n"
" info [-f fmt] filename\n"
+ " snapshot [-l | -a snapshot | -c snapshot | -d snapshot] filename\n"
"\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 'M' (megabyte)\n"
- " and 'G' (gigabyte) are supported\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"
" '-c' indicates that target image must be compressed (qcow format only)\n"
" '-e' indicates that the target image must be encrypted (qcow format only)\n"
" '-6' indicates that the target image must use compatibility level 6 (vmdk 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 format:");
+ printf("\nSupported formats:");
bdrv_iterate_format(format_print, NULL);
printf("\n");
exit(1);
} else {
drv = NULL;
}
- if (bdrv_open2(bs, filename, 0, drv) < 0) {
+ if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
error("Could not open '%s'", filename);
}
if (bdrv_is_encrypted(bs)) {
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;
- uint64_t size;
- const char *p;
BlockDriver *drv;
+ QEMUOptionParameter *param = NULL;
+ char *options = NULL;
flags = 0;
for(;;) {
- c = getopt(argc, argv, "b:f:he6");
+ 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 '6':
flags |= BLOCK_FLAG_COMPAT6;
break;
+ case 'o':
+ options = optarg;
+ break;
}
}
if (optind >= argc)
help();
filename = argv[optind++];
- size = 0;
- if (base_filename) {
- BlockDriverState *bs;
- bs = bdrv_new_open(base_filename, NULL);
- bdrv_get_geometry(bs, &size);
- size *= 512;
- bdrv_delete(bs);
- } else {
- if (optind >= argc)
- help();
- p = argv[optind];
- size = strtoul(p, (char **)&p, 0);
- if (*p == 'M') {
- size *= 1024 * 1024;
- } else if (*p == 'G') {
- size *= 1024 * 1024 * 1024;
- } else if (*p == 'k' || *p == 'K' || *p == '\0') {
- size *= 1024;
- } else {
- help();
- }
- }
+
+ /* Find driver and parse its options */
drv = bdrv_find_format(fmt);
if (!drv)
error("Unknown file format '%s'", fmt);
- printf("Formatting '%s', fmt=%s",
- filename, fmt);
- if (flags & BLOCK_FLAG_ENCRYPT)
- printf(", encrypted");
- if (flags & BLOCK_FLAG_COMPAT6)
- printf(", compatibility level=6");
- if (base_filename) {
- printf(", backing_file=%s",
- base_filename);
+
+ 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);
+ }
+
+ /* 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(", size=%" PRIu64 " kB\n", size / 1024);
- ret = bdrv_create(drv, filename, size / 512, base_filename, flags);
+
+ 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;
} else {
drv = NULL;
}
- if (bdrv_open2(bs, filename, 0, drv) < 0) {
+ if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
error("Could not open '%s'", filename);
}
ret = bdrv_commit(bs);
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;
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_filename;
+ 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;
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:hce6");
+ c = getopt(argc, argv, "f:O:B:hce6o:");
if (c == -1)
break;
switch(c) {
case 'O':
out_fmt = optarg;
break;
+ case 'B':
+ out_baseimg = optarg;
+ break;
case 'c':
flags |= BLOCK_FLAG_COMPRESS;
break;
case '6':
flags |= BLOCK_FLAG_COMPAT6;
break;
+ case 'o':
+ options = optarg;
+ break;
}
}
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)
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 (flags & BLOCK_FLAG_COMPRESS && drv != &bdrv_qcow && drv != &bdrv_qcow2)
- error("Compression not supported for this file format");
- if (flags & BLOCK_FLAG_ENCRYPT && drv != &bdrv_qcow && drv != &bdrv_qcow2)
- error("Encryption not supported for this file format");
- if (flags & BLOCK_FLAG_COMPAT6 && drv != &bdrv_vmdk)
- error("Alternative compatibility level not supported for this file format");
- if (flags & BLOCK_FLAG_ENCRYPT && flags & BLOCK_FLAG_COMPRESS)
- error("Compression and encryption not supported at the same time");
-
- ret = bdrv_create(drv, out_filename, total_sectors, NULL, flags);
+
+ 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'", fmt);
+ 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);
}
/* signal EOF to align */
bdrv_write_compressed(out_bs, 0, NULL, 0);
} else {
- sector_num = 0;
+ sector_num = 0; // total number of sectors converted so far
for(;;) {
nb_sectors = total_sectors - sector_num;
if (nb_sectors <= 0)
if (n > bs_offset + bs_sectors - sector_num)
n = bs_offset + bs_sectors - sector_num;
+ if (strcmp(drv->format_name, "host_device")) {
+ 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
should add a specific call to have the info to go faster */
buf1 = buf;
while (n > 0) {
- if (is_allocated_sectors(buf1, n, &n1)) {
+ /* 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");
}
} else {
drv = NULL;
}
- if (bdrv_open2(bs, filename, 0, drv) < 0) {
+ 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));
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
allocated_size = get_allocated_file_size(filename);
if (allocated_size < 0)
- sprintf(dsize_buf, "unavailable");
+ snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
else
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
allocated_size);
return 0;
}
+#define SNAPSHOT_LIST 1
+#define SNAPSHOT_CREATE 2
+#define SNAPSHOT_APPLY 3
+#define SNAPSHOT_DELETE 4
+
+static void 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;
+ case 'l':
+ if (action) {
+ help();
+ return;
+ }
+ action = SNAPSHOT_LIST;
+ break;
+ case 'a':
+ if (action) {
+ help();
+ return;
+ }
+ action = SNAPSHOT_APPLY;
+ snapshot_name = optarg;
+ break;
+ case 'c':
+ if (action) {
+ help();
+ return;
+ }
+ action = SNAPSHOT_CREATE;
+ snapshot_name = optarg;
+ break;
+ case 'd':
+ if (action) {
+ help();
+ return;
+ }
+ 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);
+}
+
int main(int argc, char **argv)
{
const char *cmd;
if (argc < 2)
help();
cmd = argv[1];
- optind++;
+ argc--; argv++;
if (!strcmp(cmd, "create")) {
img_create(argc, argv);
+ } else if (!strcmp(cmd, "check")) {
+ img_check(argc, argv);
} else if (!strcmp(cmd, "commit")) {
img_commit(argc, argv);
} else if (!strcmp(cmd, "convert")) {
img_convert(argc, argv);
} else if (!strcmp(cmd, "info")) {
img_info(argc, argv);
+ } else if (!strcmp(cmd, "snapshot")) {
+ img_snapshot(argc, argv);
} else {
help();
}
projects / qemu / blobdiff