mirror of https://gitee.com/openkylin/qemu.git
1624 lines
44 KiB
C
1624 lines
44 KiB
C
/*
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* QEMU disk image utility
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#include "qemu-option.h"
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#include "qemu-error.h"
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#include "osdep.h"
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#include "sysemu.h"
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#include "block_int.h"
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#include <stdio.h>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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typedef struct img_cmd_t {
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const char *name;
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int (*handler)(int argc, char **argv);
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} img_cmd_t;
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/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
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#define BDRV_O_FLAGS BDRV_O_CACHE_WB
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#define BDRV_DEFAULT_CACHE "writeback"
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static void format_print(void *opaque, const char *name)
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{
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printf(" %s", name);
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}
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/* Please keep in synch with qemu-img.texi */
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static void help(void)
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{
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const char *help_msg =
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"qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
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"usage: qemu-img command [command options]\n"
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"QEMU disk image utility\n"
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"\n"
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"Command syntax:\n"
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#define DEF(option, callback, arg_string) \
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" " arg_string "\n"
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#include "qemu-img-cmds.h"
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#undef DEF
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#undef GEN_DOCS
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"\n"
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"Command parameters:\n"
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" 'filename' is a disk image filename\n"
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" 'fmt' is the disk image format. It is guessed automatically in most cases\n"
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" 'cache' is the cache mode used to write the output disk image, the valid\n"
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" options are: 'none', 'writeback' (default), 'writethrough' and 'unsafe'\n"
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" 'size' is the disk image size in bytes. Optional suffixes\n"
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" 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n"
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" and T (terabyte, 1024G) are supported. 'b' is ignored.\n"
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" 'output_filename' is the destination disk image filename\n"
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" 'output_fmt' is the destination format\n"
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" 'options' is a comma separated list of format specific options in a\n"
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" name=value format. Use -o ? for an overview of the options supported by the\n"
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" used format\n"
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" '-c' indicates that target image must be compressed (qcow format only)\n"
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" '-u' enables unsafe rebasing. It is assumed that old and new backing file\n"
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" match exactly. The image doesn't need a working backing file before\n"
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" rebasing in this case (useful for renaming the backing file)\n"
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" '-h' with or without a command shows this help and lists the supported formats\n"
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" '-p' show progress of command (only certain commands)\n"
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"\n"
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"Parameters to snapshot subcommand:\n"
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" 'snapshot' is the name of the snapshot to create, apply or delete\n"
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" '-a' applies a snapshot (revert disk to saved state)\n"
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" '-c' creates a snapshot\n"
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" '-d' deletes a snapshot\n"
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" '-l' lists all snapshots in the given image\n";
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printf("%s\nSupported formats:", help_msg);
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bdrv_iterate_format(format_print, NULL);
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printf("\n");
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exit(1);
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}
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#if defined(WIN32)
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/* XXX: put correct support for win32 */
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static int read_password(char *buf, int buf_size)
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{
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int c, i;
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printf("Password: ");
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fflush(stdout);
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i = 0;
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for(;;) {
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c = getchar();
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if (c == '\n')
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break;
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if (i < (buf_size - 1))
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buf[i++] = c;
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}
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buf[i] = '\0';
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return 0;
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}
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#else
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#include <termios.h>
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static struct termios oldtty;
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static void term_exit(void)
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{
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tcsetattr (0, TCSANOW, &oldtty);
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}
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static void term_init(void)
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{
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struct termios tty;
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tcgetattr (0, &tty);
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oldtty = tty;
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tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
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|INLCR|IGNCR|ICRNL|IXON);
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tty.c_oflag |= OPOST;
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tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
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tty.c_cflag &= ~(CSIZE|PARENB);
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tty.c_cflag |= CS8;
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tty.c_cc[VMIN] = 1;
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tty.c_cc[VTIME] = 0;
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tcsetattr (0, TCSANOW, &tty);
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atexit(term_exit);
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}
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static int read_password(char *buf, int buf_size)
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{
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uint8_t ch;
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int i, ret;
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printf("password: ");
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fflush(stdout);
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term_init();
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i = 0;
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for(;;) {
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ret = read(0, &ch, 1);
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if (ret == -1) {
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if (errno == EAGAIN || errno == EINTR) {
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continue;
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} else {
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ret = -1;
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break;
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}
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} else if (ret == 0) {
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ret = -1;
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break;
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} else {
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if (ch == '\r') {
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ret = 0;
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break;
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}
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if (i < (buf_size - 1))
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buf[i++] = ch;
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}
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}
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term_exit();
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buf[i] = '\0';
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printf("\n");
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return ret;
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}
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#endif
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static int set_cache_flag(const char *mode, int *flags)
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{
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*flags &= ~BDRV_O_CACHE_MASK;
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if (!strcmp(mode, "none") || !strcmp(mode, "off")) {
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*flags |= BDRV_O_CACHE_WB;
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*flags |= BDRV_O_NOCACHE;
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} else if (!strcmp(mode, "writeback")) {
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*flags |= BDRV_O_CACHE_WB;
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} else if (!strcmp(mode, "unsafe")) {
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*flags |= BDRV_O_CACHE_WB;
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*flags |= BDRV_O_NO_FLUSH;
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} else if (!strcmp(mode, "writethrough")) {
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/* this is the default */
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} else {
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return -1;
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}
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return 0;
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}
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static int print_block_option_help(const char *filename, const char *fmt)
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{
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BlockDriver *drv, *proto_drv;
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QEMUOptionParameter *create_options = NULL;
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/* Find driver and parse its options */
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drv = bdrv_find_format(fmt);
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if (!drv) {
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error_report("Unknown file format '%s'", fmt);
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return 1;
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}
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proto_drv = bdrv_find_protocol(filename);
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if (!proto_drv) {
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error_report("Unknown protocol '%s'", filename);
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return 1;
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}
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create_options = append_option_parameters(create_options,
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drv->create_options);
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create_options = append_option_parameters(create_options,
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proto_drv->create_options);
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print_option_help(create_options);
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free_option_parameters(create_options);
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return 0;
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}
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static BlockDriverState *bdrv_new_open(const char *filename,
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const char *fmt,
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int flags)
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{
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BlockDriverState *bs;
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BlockDriver *drv;
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char password[256];
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int ret;
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bs = bdrv_new("image");
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if (fmt) {
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drv = bdrv_find_format(fmt);
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if (!drv) {
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error_report("Unknown file format '%s'", fmt);
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goto fail;
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}
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} else {
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drv = NULL;
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}
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ret = bdrv_open(bs, filename, flags, drv);
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if (ret < 0) {
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error_report("Could not open '%s': %s", filename, strerror(-ret));
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goto fail;
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}
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if (bdrv_is_encrypted(bs)) {
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printf("Disk image '%s' is encrypted.\n", filename);
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if (read_password(password, sizeof(password)) < 0) {
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error_report("No password given");
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goto fail;
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}
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if (bdrv_set_key(bs, password) < 0) {
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error_report("invalid password");
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goto fail;
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}
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}
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return bs;
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fail:
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if (bs) {
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bdrv_delete(bs);
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}
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return NULL;
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}
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static int add_old_style_options(const char *fmt, QEMUOptionParameter *list,
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const char *base_filename,
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const char *base_fmt)
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{
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if (base_filename) {
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if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
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error_report("Backing file not supported for file format '%s'",
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fmt);
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return -1;
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}
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}
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if (base_fmt) {
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if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
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error_report("Backing file format not supported for file "
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"format '%s'", fmt);
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return -1;
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}
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}
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return 0;
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}
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static int img_create(int argc, char **argv)
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{
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int c, ret = 0;
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uint64_t img_size = -1;
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const char *fmt = "raw";
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const char *base_fmt = NULL;
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const char *filename;
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const char *base_filename = NULL;
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char *options = NULL;
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for(;;) {
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c = getopt(argc, argv, "F:b:f:he6o:");
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if (c == -1) {
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break;
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}
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switch(c) {
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case '?':
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case 'h':
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help();
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break;
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case 'F':
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base_fmt = optarg;
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break;
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case 'b':
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base_filename = optarg;
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break;
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case 'f':
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fmt = optarg;
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break;
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case 'e':
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error_report("option -e is deprecated, please use \'-o "
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"encryption\' instead!");
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return 1;
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case '6':
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error_report("option -6 is deprecated, please use \'-o "
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"compat6\' instead!");
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return 1;
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case 'o':
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options = optarg;
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break;
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}
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}
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/* Get the filename */
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if (optind >= argc) {
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help();
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}
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filename = argv[optind++];
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/* Get image size, if specified */
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if (optind < argc) {
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int64_t sval;
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sval = strtosz_suffix(argv[optind++], NULL, STRTOSZ_DEFSUFFIX_B);
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if (sval < 0) {
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error_report("Invalid image size specified! You may use k, M, G or "
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"T suffixes for ");
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error_report("kilobytes, megabytes, gigabytes and terabytes.");
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ret = -1;
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goto out;
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}
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img_size = (uint64_t)sval;
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}
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if (options && !strcmp(options, "?")) {
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ret = print_block_option_help(filename, fmt);
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goto out;
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}
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ret = bdrv_img_create(filename, fmt, base_filename, base_fmt,
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options, img_size, BDRV_O_FLAGS);
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out:
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if (ret) {
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return 1;
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}
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return 0;
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}
|
|
|
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/*
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* Checks an image for consistency. Exit codes:
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*
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* 0 - Check completed, image is good
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* 1 - Check not completed because of internal errors
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* 2 - Check completed, image is corrupted
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* 3 - Check completed, image has leaked clusters, but is good otherwise
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*/
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static int img_check(int argc, char **argv)
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{
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int c, ret;
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const char *filename, *fmt;
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BlockDriverState *bs;
|
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BdrvCheckResult result;
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fmt = NULL;
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for(;;) {
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c = getopt(argc, argv, "f:h");
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if (c == -1) {
|
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break;
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}
|
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switch(c) {
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case '?':
|
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case 'h':
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help();
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break;
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case 'f':
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fmt = optarg;
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break;
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}
|
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}
|
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if (optind >= argc) {
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help();
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}
|
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filename = argv[optind++];
|
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|
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bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS);
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if (!bs) {
|
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return 1;
|
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}
|
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ret = bdrv_check(bs, &result);
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|
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if (ret == -ENOTSUP) {
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error_report("This image format does not support checks");
|
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bdrv_delete(bs);
|
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return 1;
|
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}
|
|
|
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if (!(result.corruptions || result.leaks || result.check_errors)) {
|
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printf("No errors were found on the image.\n");
|
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} else {
|
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if (result.corruptions) {
|
|
printf("\n%d errors were found on the image.\n"
|
|
"Data may be corrupted, or further writes to the image "
|
|
"may corrupt it.\n",
|
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result.corruptions);
|
|
}
|
|
|
|
if (result.leaks) {
|
|
printf("\n%d leaked clusters were found on the image.\n"
|
|
"This means waste of disk space, but no harm to data.\n",
|
|
result.leaks);
|
|
}
|
|
|
|
if (result.check_errors) {
|
|
printf("\n%d internal errors have occurred during the check.\n",
|
|
result.check_errors);
|
|
}
|
|
}
|
|
|
|
bdrv_delete(bs);
|
|
|
|
if (ret < 0 || result.check_errors) {
|
|
printf("\nAn error has occurred during the check: %s\n"
|
|
"The check is not complete and may have missed error.\n",
|
|
strerror(-ret));
|
|
return 1;
|
|
}
|
|
|
|
if (result.corruptions) {
|
|
return 2;
|
|
} else if (result.leaks) {
|
|
return 3;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int img_commit(int argc, char **argv)
|
|
{
|
|
int c, ret, flags;
|
|
const char *filename, *fmt, *cache;
|
|
BlockDriverState *bs;
|
|
|
|
fmt = NULL;
|
|
cache = BDRV_DEFAULT_CACHE;
|
|
for(;;) {
|
|
c = getopt(argc, argv, "f:ht:");
|
|
if (c == -1) {
|
|
break;
|
|
}
|
|
switch(c) {
|
|
case '?':
|
|
case 'h':
|
|
help();
|
|
break;
|
|
case 'f':
|
|
fmt = optarg;
|
|
break;
|
|
case 't':
|
|
cache = optarg;
|
|
break;
|
|
}
|
|
}
|
|
if (optind >= argc) {
|
|
help();
|
|
}
|
|
filename = argv[optind++];
|
|
|
|
flags = BDRV_O_RDWR;
|
|
ret = set_cache_flag(cache, &flags);
|
|
if (ret < 0) {
|
|
error_report("Invalid cache option: %s", cache);
|
|
return -1;
|
|
}
|
|
|
|
bs = bdrv_new_open(filename, fmt, flags);
|
|
if (!bs) {
|
|
return 1;
|
|
}
|
|
ret = bdrv_commit(bs);
|
|
switch(ret) {
|
|
case 0:
|
|
printf("Image committed.\n");
|
|
break;
|
|
case -ENOENT:
|
|
error_report("No disk inserted");
|
|
break;
|
|
case -EACCES:
|
|
error_report("Image is read-only");
|
|
break;
|
|
case -ENOTSUP:
|
|
error_report("Image is already committed");
|
|
break;
|
|
default:
|
|
error_report("Error while committing image");
|
|
break;
|
|
}
|
|
|
|
bdrv_delete(bs);
|
|
if (ret) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Checks whether the sector is not a zero sector.
|
|
*
|
|
* Attention! The len must be a multiple of 4 * sizeof(long) due to
|
|
* restriction of optimizations in this function.
|
|
*/
|
|
static int is_not_zero(const uint8_t *sector, int len)
|
|
{
|
|
/*
|
|
* Use long as the biggest available internal data type that fits into the
|
|
* CPU register and unroll the loop to smooth out the effect of memory
|
|
* latency.
|
|
*/
|
|
|
|
int i;
|
|
long d0, d1, d2, d3;
|
|
const long * const data = (const long *) sector;
|
|
|
|
len /= sizeof(long);
|
|
|
|
for(i = 0; i < len; i += 4) {
|
|
d0 = data[i + 0];
|
|
d1 = data[i + 1];
|
|
d2 = data[i + 2];
|
|
d3 = data[i + 3];
|
|
|
|
if (d0 || d1 || d2 || d3) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Compares two buffers sector by sector. Returns 0 if the first sector of both
|
|
* buffers matches, non-zero otherwise.
|
|
*
|
|
* pnum is set to the number of sectors (including and immediately following
|
|
* the first one) that are known to have the same comparison result
|
|
*/
|
|
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n,
|
|
int *pnum)
|
|
{
|
|
int res, i;
|
|
|
|
if (n <= 0) {
|
|
*pnum = 0;
|
|
return 0;
|
|
}
|
|
|
|
res = !!memcmp(buf1, buf2, 512);
|
|
for(i = 1; i < n; i++) {
|
|
buf1 += 512;
|
|
buf2 += 512;
|
|
|
|
if (!!memcmp(buf1, buf2, 512) != res) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
*pnum = i;
|
|
return res;
|
|
}
|
|
|
|
#define IO_BUF_SIZE (2 * 1024 * 1024)
|
|
|
|
static int img_convert(int argc, char **argv)
|
|
{
|
|
int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, cluster_sectors;
|
|
int progress = 0, flags;
|
|
const char *fmt, *out_fmt, *cache, *out_baseimg, *out_filename;
|
|
BlockDriver *drv, *proto_drv;
|
|
BlockDriverState **bs = NULL, *out_bs = NULL;
|
|
int64_t total_sectors, nb_sectors, sector_num, bs_offset;
|
|
uint64_t bs_sectors;
|
|
uint8_t * buf = NULL;
|
|
const uint8_t *buf1;
|
|
BlockDriverInfo bdi;
|
|
QEMUOptionParameter *param = NULL, *create_options = NULL;
|
|
QEMUOptionParameter *out_baseimg_param;
|
|
char *options = NULL;
|
|
const char *snapshot_name = NULL;
|
|
float local_progress;
|
|
|
|
fmt = NULL;
|
|
out_fmt = "raw";
|
|
cache = "unsafe";
|
|
out_baseimg = NULL;
|
|
compress = 0;
|
|
for(;;) {
|
|
c = getopt(argc, argv, "f:O:B:s:hce6o:pt:");
|
|
if (c == -1) {
|
|
break;
|
|
}
|
|
switch(c) {
|
|
case '?':
|
|
case 'h':
|
|
help();
|
|
break;
|
|
case 'f':
|
|
fmt = optarg;
|
|
break;
|
|
case 'O':
|
|
out_fmt = optarg;
|
|
break;
|
|
case 'B':
|
|
out_baseimg = optarg;
|
|
break;
|
|
case 'c':
|
|
compress = 1;
|
|
break;
|
|
case 'e':
|
|
error_report("option -e is deprecated, please use \'-o "
|
|
"encryption\' instead!");
|
|
return 1;
|
|
case '6':
|
|
error_report("option -6 is deprecated, please use \'-o "
|
|
"compat6\' instead!");
|
|
return 1;
|
|
case 'o':
|
|
options = optarg;
|
|
break;
|
|
case 's':
|
|
snapshot_name = optarg;
|
|
break;
|
|
case 'p':
|
|
progress = 1;
|
|
break;
|
|
case 't':
|
|
cache = optarg;
|
|
break;
|
|
}
|
|
}
|
|
|
|
bs_n = argc - optind - 1;
|
|
if (bs_n < 1) {
|
|
help();
|
|
}
|
|
|
|
out_filename = argv[argc - 1];
|
|
|
|
if (options && !strcmp(options, "?")) {
|
|
ret = print_block_option_help(out_filename, out_fmt);
|
|
goto out;
|
|
}
|
|
|
|
if (bs_n > 1 && out_baseimg) {
|
|
error_report("-B makes no sense when concatenating multiple input "
|
|
"images");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
qemu_progress_init(progress, 2.0);
|
|
qemu_progress_print(0, 100);
|
|
|
|
bs = g_malloc0(bs_n * sizeof(BlockDriverState *));
|
|
|
|
total_sectors = 0;
|
|
for (bs_i = 0; bs_i < bs_n; bs_i++) {
|
|
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS);
|
|
if (!bs[bs_i]) {
|
|
error_report("Could not open '%s'", argv[optind + bs_i]);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
bdrv_get_geometry(bs[bs_i], &bs_sectors);
|
|
total_sectors += bs_sectors;
|
|
}
|
|
|
|
if (snapshot_name != NULL) {
|
|
if (bs_n > 1) {
|
|
error_report("No support for concatenating multiple snapshot");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) {
|
|
error_report("Failed to load snapshot");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Find driver and parse its options */
|
|
drv = bdrv_find_format(out_fmt);
|
|
if (!drv) {
|
|
error_report("Unknown file format '%s'", out_fmt);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
proto_drv = bdrv_find_protocol(out_filename);
|
|
if (!proto_drv) {
|
|
error_report("Unknown protocol '%s'", out_filename);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
create_options = append_option_parameters(create_options,
|
|
drv->create_options);
|
|
create_options = append_option_parameters(create_options,
|
|
proto_drv->create_options);
|
|
|
|
if (options) {
|
|
param = parse_option_parameters(options, create_options, param);
|
|
if (param == NULL) {
|
|
error_report("Invalid options for file format '%s'.", out_fmt);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
} else {
|
|
param = parse_option_parameters("", create_options, param);
|
|
}
|
|
|
|
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
|
|
ret = add_old_style_options(out_fmt, param, out_baseimg, NULL);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
/* Get backing file name if -o backing_file was used */
|
|
out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
|
|
if (out_baseimg_param) {
|
|
out_baseimg = out_baseimg_param->value.s;
|
|
}
|
|
|
|
/* Check if compression is supported */
|
|
if (compress) {
|
|
QEMUOptionParameter *encryption =
|
|
get_option_parameter(param, BLOCK_OPT_ENCRYPT);
|
|
|
|
if (!drv->bdrv_write_compressed) {
|
|
error_report("Compression not supported for this file format");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (encryption && encryption->value.n) {
|
|
error_report("Compression and encryption not supported at "
|
|
"the same time");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Create the new image */
|
|
ret = bdrv_create(drv, out_filename, param);
|
|
if (ret < 0) {
|
|
if (ret == -ENOTSUP) {
|
|
error_report("Formatting not supported for file format '%s'",
|
|
out_fmt);
|
|
} else if (ret == -EFBIG) {
|
|
error_report("The image size is too large for file format '%s'",
|
|
out_fmt);
|
|
} else {
|
|
error_report("%s: error while converting %s: %s",
|
|
out_filename, out_fmt, strerror(-ret));
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
flags = BDRV_O_RDWR;
|
|
ret = set_cache_flag(cache, &flags);
|
|
if (ret < 0) {
|
|
error_report("Invalid cache option: %s", cache);
|
|
return -1;
|
|
}
|
|
|
|
out_bs = bdrv_new_open(out_filename, out_fmt, flags);
|
|
if (!out_bs) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
bs_i = 0;
|
|
bs_offset = 0;
|
|
bdrv_get_geometry(bs[0], &bs_sectors);
|
|
buf = g_malloc(IO_BUF_SIZE);
|
|
|
|
if (compress) {
|
|
ret = bdrv_get_info(out_bs, &bdi);
|
|
if (ret < 0) {
|
|
error_report("could not get block driver info");
|
|
goto out;
|
|
}
|
|
cluster_size = bdi.cluster_size;
|
|
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) {
|
|
error_report("invalid cluster size");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
cluster_sectors = cluster_size >> 9;
|
|
sector_num = 0;
|
|
|
|
nb_sectors = total_sectors;
|
|
local_progress = (float)100 /
|
|
(nb_sectors / MIN(nb_sectors, cluster_sectors));
|
|
|
|
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=%" PRId64 ", "
|
|
"bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64
|
|
"\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;
|
|
|
|
ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow);
|
|
if (ret < 0) {
|
|
error_report("error while reading");
|
|
goto out;
|
|
}
|
|
|
|
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)) {
|
|
ret = bdrv_write_compressed(out_bs, sector_num, buf,
|
|
cluster_sectors);
|
|
if (ret != 0) {
|
|
error_report("error while compressing sector %" PRId64,
|
|
sector_num);
|
|
goto out;
|
|
}
|
|
}
|
|
sector_num += n;
|
|
qemu_progress_print(local_progress, 100);
|
|
}
|
|
/* signal EOF to align */
|
|
bdrv_write_compressed(out_bs, 0, NULL, 0);
|
|
} else {
|
|
int has_zero_init = bdrv_has_zero_init(out_bs);
|
|
|
|
sector_num = 0; // total number of sectors converted so far
|
|
nb_sectors = total_sectors - sector_num;
|
|
local_progress = (float)100 /
|
|
(nb_sectors / MIN(nb_sectors, IO_BUF_SIZE / 512));
|
|
|
|
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=%" PRId64 ", bs_i=%d, "
|
|
"bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\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 (has_zero_init) {
|
|
/* 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;
|
|
}
|
|
|
|
ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n);
|
|
if (ret < 0) {
|
|
error_report("error while reading");
|
|
goto out;
|
|
}
|
|
/* 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 (!has_zero_init || out_baseimg ||
|
|
is_allocated_sectors(buf1, n, &n1)) {
|
|
ret = bdrv_write(out_bs, sector_num, buf1, n1);
|
|
if (ret < 0) {
|
|
error_report("error while writing");
|
|
goto out;
|
|
}
|
|
}
|
|
sector_num += n1;
|
|
n -= n1;
|
|
buf1 += n1 * 512;
|
|
}
|
|
qemu_progress_print(local_progress, 100);
|
|
}
|
|
}
|
|
out:
|
|
qemu_progress_end();
|
|
free_option_parameters(create_options);
|
|
free_option_parameters(param);
|
|
g_free(buf);
|
|
if (out_bs) {
|
|
bdrv_delete(out_bs);
|
|
}
|
|
if (bs) {
|
|
for (bs_i = 0; bs_i < bs_n; bs_i++) {
|
|
if (bs[bs_i]) {
|
|
bdrv_delete(bs[bs_i]);
|
|
}
|
|
}
|
|
g_free(bs);
|
|
}
|
|
if (ret) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
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));
|
|
}
|
|
g_free(sn_tab);
|
|
}
|
|
|
|
static int img_info(int argc, char **argv)
|
|
{
|
|
int c;
|
|
const char *filename, *fmt;
|
|
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 '?':
|
|
case 'h':
|
|
help();
|
|
break;
|
|
case 'f':
|
|
fmt = optarg;
|
|
break;
|
|
}
|
|
}
|
|
if (optind >= argc) {
|
|
help();
|
|
}
|
|
filename = argv[optind++];
|
|
|
|
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING);
|
|
if (!bs) {
|
|
return 1;
|
|
}
|
|
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 = bdrv_get_allocated_file_size(bs);
|
|
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 = 0, bdrv_oflags;
|
|
int action = 0;
|
|
qemu_timeval tv;
|
|
|
|
bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR;
|
|
/* Parse commandline parameters */
|
|
for(;;) {
|
|
c = getopt(argc, argv, "la:c:d:h");
|
|
if (c == -1) {
|
|
break;
|
|
}
|
|
switch(c) {
|
|
case '?':
|
|
case 'h':
|
|
help();
|
|
return 0;
|
|
case 'l':
|
|
if (action) {
|
|
help();
|
|
return 0;
|
|
}
|
|
action = SNAPSHOT_LIST;
|
|
bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
|
|
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_open(filename, NULL, bdrv_oflags);
|
|
if (!bs) {
|
|
return 1;
|
|
}
|
|
|
|
/* 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_report("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_report("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_report("Could not delete snapshot '%s': %d (%s)",
|
|
snapshot_name, ret, strerror(-ret));
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Cleanup */
|
|
bdrv_delete(bs);
|
|
if (ret) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int img_rebase(int argc, char **argv)
|
|
{
|
|
BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL;
|
|
BlockDriver *old_backing_drv, *new_backing_drv;
|
|
char *filename;
|
|
const char *fmt, *cache, *out_basefmt, *out_baseimg;
|
|
int c, flags, ret;
|
|
int unsafe = 0;
|
|
int progress = 0;
|
|
|
|
/* Parse commandline parameters */
|
|
fmt = NULL;
|
|
cache = BDRV_DEFAULT_CACHE;
|
|
out_baseimg = NULL;
|
|
out_basefmt = NULL;
|
|
for(;;) {
|
|
c = getopt(argc, argv, "uhf:F:b:pt:");
|
|
if (c == -1) {
|
|
break;
|
|
}
|
|
switch(c) {
|
|
case '?':
|
|
case 'h':
|
|
help();
|
|
return 0;
|
|
case 'f':
|
|
fmt = optarg;
|
|
break;
|
|
case 'F':
|
|
out_basefmt = optarg;
|
|
break;
|
|
case 'b':
|
|
out_baseimg = optarg;
|
|
break;
|
|
case 'u':
|
|
unsafe = 1;
|
|
break;
|
|
case 'p':
|
|
progress = 1;
|
|
break;
|
|
case 't':
|
|
cache = optarg;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((optind >= argc) || (!unsafe && !out_baseimg)) {
|
|
help();
|
|
}
|
|
filename = argv[optind++];
|
|
|
|
qemu_progress_init(progress, 2.0);
|
|
qemu_progress_print(0, 100);
|
|
|
|
flags = BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
|
ret = set_cache_flag(cache, &flags);
|
|
if (ret < 0) {
|
|
error_report("Invalid cache option: %s", cache);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Open the images.
|
|
*
|
|
* Ignore the old backing file for unsafe rebase in case we want to correct
|
|
* the reference to a renamed or moved backing file.
|
|
*/
|
|
bs = bdrv_new_open(filename, fmt, flags);
|
|
if (!bs) {
|
|
return 1;
|
|
}
|
|
|
|
/* Find the right drivers for the backing files */
|
|
old_backing_drv = NULL;
|
|
new_backing_drv = NULL;
|
|
|
|
if (!unsafe && bs->backing_format[0] != '\0') {
|
|
old_backing_drv = bdrv_find_format(bs->backing_format);
|
|
if (old_backing_drv == NULL) {
|
|
error_report("Invalid format name: '%s'", bs->backing_format);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (out_basefmt != NULL) {
|
|
new_backing_drv = bdrv_find_format(out_basefmt);
|
|
if (new_backing_drv == NULL) {
|
|
error_report("Invalid format name: '%s'", out_basefmt);
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* For safe rebasing we need to compare old and new backing file */
|
|
if (unsafe) {
|
|
/* Make the compiler happy */
|
|
bs_old_backing = NULL;
|
|
bs_new_backing = NULL;
|
|
} else {
|
|
char backing_name[1024];
|
|
|
|
bs_old_backing = bdrv_new("old_backing");
|
|
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
|
ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS,
|
|
old_backing_drv);
|
|
if (ret) {
|
|
error_report("Could not open old backing file '%s'", backing_name);
|
|
goto out;
|
|
}
|
|
|
|
bs_new_backing = bdrv_new("new_backing");
|
|
ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS,
|
|
new_backing_drv);
|
|
if (ret) {
|
|
error_report("Could not open new backing file '%s'", out_baseimg);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check each unallocated cluster in the COW file. If it is unallocated,
|
|
* accesses go to the backing file. We must therefore compare this cluster
|
|
* in the old and new backing file, and if they differ we need to copy it
|
|
* from the old backing file into the COW file.
|
|
*
|
|
* If qemu-img crashes during this step, no harm is done. The content of
|
|
* the image is the same as the original one at any time.
|
|
*/
|
|
if (!unsafe) {
|
|
uint64_t num_sectors;
|
|
uint64_t sector;
|
|
int n;
|
|
uint8_t * buf_old;
|
|
uint8_t * buf_new;
|
|
float local_progress;
|
|
|
|
buf_old = g_malloc(IO_BUF_SIZE);
|
|
buf_new = g_malloc(IO_BUF_SIZE);
|
|
|
|
bdrv_get_geometry(bs, &num_sectors);
|
|
|
|
local_progress = (float)100 /
|
|
(num_sectors / MIN(num_sectors, IO_BUF_SIZE / 512));
|
|
for (sector = 0; sector < num_sectors; sector += n) {
|
|
|
|
/* How many sectors can we handle with the next read? */
|
|
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) {
|
|
n = (IO_BUF_SIZE / 512);
|
|
} else {
|
|
n = num_sectors - sector;
|
|
}
|
|
|
|
/* If the cluster is allocated, we don't need to take action */
|
|
ret = bdrv_is_allocated(bs, sector, n, &n);
|
|
if (ret) {
|
|
continue;
|
|
}
|
|
|
|
/* Read old and new backing file */
|
|
ret = bdrv_read(bs_old_backing, sector, buf_old, n);
|
|
if (ret < 0) {
|
|
error_report("error while reading from old backing file");
|
|
goto out;
|
|
}
|
|
ret = bdrv_read(bs_new_backing, sector, buf_new, n);
|
|
if (ret < 0) {
|
|
error_report("error while reading from new backing file");
|
|
goto out;
|
|
}
|
|
|
|
/* If they differ, we need to write to the COW file */
|
|
uint64_t written = 0;
|
|
|
|
while (written < n) {
|
|
int pnum;
|
|
|
|
if (compare_sectors(buf_old + written * 512,
|
|
buf_new + written * 512, n - written, &pnum))
|
|
{
|
|
ret = bdrv_write(bs, sector + written,
|
|
buf_old + written * 512, pnum);
|
|
if (ret < 0) {
|
|
error_report("Error while writing to COW image: %s",
|
|
strerror(-ret));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
written += pnum;
|
|
}
|
|
qemu_progress_print(local_progress, 100);
|
|
}
|
|
|
|
g_free(buf_old);
|
|
g_free(buf_new);
|
|
}
|
|
|
|
/*
|
|
* Change the backing file. All clusters that are different from the old
|
|
* backing file are overwritten in the COW file now, so the visible content
|
|
* doesn't change when we switch the backing file.
|
|
*/
|
|
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt);
|
|
if (ret == -ENOSPC) {
|
|
error_report("Could not change the backing file to '%s': No "
|
|
"space left in the file header", out_baseimg);
|
|
} else if (ret < 0) {
|
|
error_report("Could not change the backing file to '%s': %s",
|
|
out_baseimg, strerror(-ret));
|
|
}
|
|
|
|
qemu_progress_print(100, 0);
|
|
/*
|
|
* TODO At this point it is possible to check if any clusters that are
|
|
* allocated in the COW file are the same in the backing file. If so, they
|
|
* could be dropped from the COW file. Don't do this before switching the
|
|
* backing file, in case of a crash this would lead to corruption.
|
|
*/
|
|
out:
|
|
qemu_progress_end();
|
|
/* Cleanup */
|
|
if (!unsafe) {
|
|
if (bs_old_backing != NULL) {
|
|
bdrv_delete(bs_old_backing);
|
|
}
|
|
if (bs_new_backing != NULL) {
|
|
bdrv_delete(bs_new_backing);
|
|
}
|
|
}
|
|
|
|
bdrv_delete(bs);
|
|
if (ret) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int img_resize(int argc, char **argv)
|
|
{
|
|
int c, ret, relative;
|
|
const char *filename, *fmt, *size;
|
|
int64_t n, total_size;
|
|
BlockDriverState *bs = NULL;
|
|
QEMUOptionParameter *param;
|
|
QEMUOptionParameter resize_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
/* Remove size from argv manually so that negative numbers are not treated
|
|
* as options by getopt. */
|
|
if (argc < 3) {
|
|
help();
|
|
return 1;
|
|
}
|
|
|
|
size = argv[--argc];
|
|
|
|
/* Parse getopt arguments */
|
|
fmt = NULL;
|
|
for(;;) {
|
|
c = getopt(argc, argv, "f:h");
|
|
if (c == -1) {
|
|
break;
|
|
}
|
|
switch(c) {
|
|
case '?':
|
|
case 'h':
|
|
help();
|
|
break;
|
|
case 'f':
|
|
fmt = optarg;
|
|
break;
|
|
}
|
|
}
|
|
if (optind >= argc) {
|
|
help();
|
|
}
|
|
filename = argv[optind++];
|
|
|
|
/* Choose grow, shrink, or absolute resize mode */
|
|
switch (size[0]) {
|
|
case '+':
|
|
relative = 1;
|
|
size++;
|
|
break;
|
|
case '-':
|
|
relative = -1;
|
|
size++;
|
|
break;
|
|
default:
|
|
relative = 0;
|
|
break;
|
|
}
|
|
|
|
/* Parse size */
|
|
param = parse_option_parameters("", resize_options, NULL);
|
|
if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) {
|
|
/* Error message already printed when size parsing fails */
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n;
|
|
free_option_parameters(param);
|
|
|
|
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
|
|
if (!bs) {
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
if (relative) {
|
|
total_size = bdrv_getlength(bs) + n * relative;
|
|
} else {
|
|
total_size = n;
|
|
}
|
|
if (total_size <= 0) {
|
|
error_report("New image size must be positive");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
ret = bdrv_truncate(bs, total_size);
|
|
switch (ret) {
|
|
case 0:
|
|
printf("Image resized.\n");
|
|
break;
|
|
case -ENOTSUP:
|
|
error_report("This image format does not support resize");
|
|
break;
|
|
case -EACCES:
|
|
error_report("Image is read-only");
|
|
break;
|
|
default:
|
|
error_report("Error resizing image (%d)", -ret);
|
|
break;
|
|
}
|
|
out:
|
|
if (bs) {
|
|
bdrv_delete(bs);
|
|
}
|
|
if (ret) {
|
|
return 1;
|
|
}
|
|
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;
|
|
|
|
error_set_progname(argv[0]);
|
|
|
|
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;
|
|
}
|