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/*
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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 "osdep.h" |
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#include "block_int.h" |
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#include <stdio.h> |
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|
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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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|
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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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|
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static void QEMU_NORETURN error(const char *fmt, ...) |
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{ |
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va_list ap; |
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va_start(ap, fmt); |
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fprintf(stderr, "qemu-img: ");
|
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vfprintf(stderr, fmt, ap); |
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fprintf(stderr, "\n");
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exit(1);
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va_end(ap); |
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} |
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|
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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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|
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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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" '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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"\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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|
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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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|
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#else
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|
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#include <termios.h> |
125 |
|
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static struct termios oldtty; |
127 |
|
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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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} |
132 |
|
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static void term_init(void) |
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{ |
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struct termios tty;
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|
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tcgetattr (0, &tty);
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oldtty = tty; |
139 |
|
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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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|
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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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|
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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); |
165 |
if (ret == -1) { |
166 |
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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} |
180 |
if (i < (buf_size - 1)) |
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buf[i++] = ch; |
182 |
} |
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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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|
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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]; |
198 |
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bs = bdrv_new("");
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if (!bs)
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error("Not enough memory");
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if (fmt) {
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drv = bdrv_find_format(fmt); |
204 |
if (!drv)
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error("Unknown file format '%s'", fmt);
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} else {
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drv = NULL;
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} |
209 |
if (bdrv_open(bs, filename, flags, drv) < 0) { |
210 |
error("Could not open '%s'", filename);
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} |
212 |
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("No password given");
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if (bdrv_set_key(bs, password) < 0) |
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error("invalid password");
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} |
219 |
return bs;
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} |
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|
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static void add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
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int flags, const char *base_filename, const char *base_fmt) |
224 |
{ |
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if (flags & BLOCK_FLAG_ENCRYPT) {
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if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) { |
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error("Encryption not supported for file format '%s'", fmt);
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} |
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} |
230 |
if (flags & BLOCK_FLAG_COMPAT6) {
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if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) { |
232 |
error("VMDK version 6 not supported for file format '%s'", fmt);
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} |
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} |
235 |
|
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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("Backing file not supported for file format '%s'", fmt);
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} |
240 |
} |
241 |
if (base_fmt) {
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if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
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error("Backing file format not supported for file format '%s'", fmt);
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} |
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} |
246 |
} |
247 |
|
248 |
static int img_create(int argc, char **argv) |
249 |
{ |
250 |
int c, ret, flags;
|
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const char *fmt = "raw"; |
252 |
const char *base_fmt = NULL; |
253 |
const char *filename; |
254 |
const char *base_filename = NULL; |
255 |
BlockDriver *drv; |
256 |
QEMUOptionParameter *param = NULL;
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char *options = NULL; |
258 |
|
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flags = 0;
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for(;;) {
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c = getopt(argc, argv, "F:b:f:he6o:");
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if (c == -1) |
263 |
break;
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switch(c) {
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case 'h': |
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help(); |
267 |
break;
|
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case 'F': |
269 |
base_fmt = optarg; |
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break;
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case 'b': |
272 |
base_filename = optarg; |
273 |
break;
|
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case 'f': |
275 |
fmt = optarg; |
276 |
break;
|
277 |
case 'e': |
278 |
flags |= BLOCK_FLAG_ENCRYPT; |
279 |
break;
|
280 |
case '6': |
281 |
flags |= BLOCK_FLAG_COMPAT6; |
282 |
break;
|
283 |
case 'o': |
284 |
options = optarg; |
285 |
break;
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} |
287 |
} |
288 |
|
289 |
/* Find driver and parse its options */
|
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drv = bdrv_find_format(fmt); |
291 |
if (!drv)
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error("Unknown file format '%s'", fmt);
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293 |
|
294 |
if (options && !strcmp(options, "?")) { |
295 |
print_option_help(drv->create_options); |
296 |
return 0; |
297 |
} |
298 |
|
299 |
/* Create parameter list with default values */
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300 |
param = parse_option_parameters("", drv->create_options, param);
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301 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, -1);
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302 |
|
303 |
/* Parse -o options */
|
304 |
if (options) {
|
305 |
param = parse_option_parameters(options, drv->create_options, param); |
306 |
if (param == NULL) { |
307 |
error("Invalid options for file format '%s'.", fmt);
|
308 |
} |
309 |
} |
310 |
|
311 |
/* Get the filename */
|
312 |
if (optind >= argc)
|
313 |
help(); |
314 |
filename = argv[optind++]; |
315 |
|
316 |
/* Add size to parameters */
|
317 |
if (optind < argc) {
|
318 |
set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]); |
319 |
} |
320 |
|
321 |
/* Add old-style options to parameters */
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322 |
add_old_style_options(fmt, param, flags, base_filename, base_fmt); |
323 |
|
324 |
// The size for the image must always be specified, with one exception:
|
325 |
// If we are using a backing file, we can obtain the size from there
|
326 |
if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { |
327 |
|
328 |
QEMUOptionParameter *backing_file = |
329 |
get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
330 |
QEMUOptionParameter *backing_fmt = |
331 |
get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
332 |
|
333 |
if (backing_file && backing_file->value.s) {
|
334 |
BlockDriverState *bs; |
335 |
uint64_t size; |
336 |
const char *fmt = NULL; |
337 |
char buf[32]; |
338 |
|
339 |
if (backing_fmt && backing_fmt->value.s) {
|
340 |
if (bdrv_find_format(backing_fmt->value.s)) {
|
341 |
fmt = backing_fmt->value.s; |
342 |
} else {
|
343 |
error("Unknown backing file format '%s'",
|
344 |
backing_fmt->value.s); |
345 |
} |
346 |
} |
347 |
|
348 |
bs = bdrv_new_open(backing_file->value.s, fmt, BDRV_O_FLAGS); |
349 |
bdrv_get_geometry(bs, &size); |
350 |
size *= 512;
|
351 |
bdrv_delete(bs); |
352 |
|
353 |
snprintf(buf, sizeof(buf), "%" PRId64, size); |
354 |
set_option_parameter(param, BLOCK_OPT_SIZE, buf); |
355 |
} else {
|
356 |
error("Image creation needs a size parameter");
|
357 |
} |
358 |
} |
359 |
|
360 |
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
361 |
print_option_parameters(param); |
362 |
puts("");
|
363 |
|
364 |
ret = bdrv_create(drv, filename, param); |
365 |
free_option_parameters(param); |
366 |
|
367 |
if (ret < 0) { |
368 |
if (ret == -ENOTSUP) {
|
369 |
error("Formatting or formatting option not supported for file format '%s'", fmt);
|
370 |
} else if (ret == -EFBIG) { |
371 |
error("The image size is too large for file format '%s'", fmt);
|
372 |
} else {
|
373 |
error("%s: error while creating %s: %s", filename, fmt, strerror(-ret));
|
374 |
} |
375 |
} |
376 |
return 0; |
377 |
} |
378 |
|
379 |
static int img_check(int argc, char **argv) |
380 |
{ |
381 |
int c, ret;
|
382 |
const char *filename, *fmt; |
383 |
BlockDriverState *bs; |
384 |
|
385 |
fmt = NULL;
|
386 |
for(;;) {
|
387 |
c = getopt(argc, argv, "f:h");
|
388 |
if (c == -1) |
389 |
break;
|
390 |
switch(c) {
|
391 |
case 'h': |
392 |
help(); |
393 |
break;
|
394 |
case 'f': |
395 |
fmt = optarg; |
396 |
break;
|
397 |
} |
398 |
} |
399 |
if (optind >= argc)
|
400 |
help(); |
401 |
filename = argv[optind++]; |
402 |
|
403 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); |
404 |
ret = bdrv_check(bs); |
405 |
switch(ret) {
|
406 |
case 0: |
407 |
printf("No errors were found on the image.\n");
|
408 |
break;
|
409 |
case -ENOTSUP:
|
410 |
error("This image format does not support checks");
|
411 |
break;
|
412 |
default:
|
413 |
if (ret < 0) { |
414 |
error("An error occurred during the check");
|
415 |
} else {
|
416 |
printf("%d errors were found on the image.\n", ret);
|
417 |
} |
418 |
break;
|
419 |
} |
420 |
|
421 |
bdrv_delete(bs); |
422 |
return 0; |
423 |
} |
424 |
|
425 |
static int img_commit(int argc, char **argv) |
426 |
{ |
427 |
int c, ret;
|
428 |
const char *filename, *fmt; |
429 |
BlockDriverState *bs; |
430 |
|
431 |
fmt = NULL;
|
432 |
for(;;) {
|
433 |
c = getopt(argc, argv, "f:h");
|
434 |
if (c == -1) |
435 |
break;
|
436 |
switch(c) {
|
437 |
case 'h': |
438 |
help(); |
439 |
break;
|
440 |
case 'f': |
441 |
fmt = optarg; |
442 |
break;
|
443 |
} |
444 |
} |
445 |
if (optind >= argc)
|
446 |
help(); |
447 |
filename = argv[optind++]; |
448 |
|
449 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
450 |
ret = bdrv_commit(bs); |
451 |
switch(ret) {
|
452 |
case 0: |
453 |
printf("Image committed.\n");
|
454 |
break;
|
455 |
case -ENOENT:
|
456 |
error("No disk inserted");
|
457 |
break;
|
458 |
case -EACCES:
|
459 |
error("Image is read-only");
|
460 |
break;
|
461 |
case -ENOTSUP:
|
462 |
error("Image is already committed");
|
463 |
break;
|
464 |
default:
|
465 |
error("Error while committing image");
|
466 |
break;
|
467 |
} |
468 |
|
469 |
bdrv_delete(bs); |
470 |
return 0; |
471 |
} |
472 |
|
473 |
static int is_not_zero(const uint8_t *sector, int len) |
474 |
{ |
475 |
int i;
|
476 |
len >>= 2;
|
477 |
for(i = 0;i < len; i++) { |
478 |
if (((uint32_t *)sector)[i] != 0) |
479 |
return 1; |
480 |
} |
481 |
return 0; |
482 |
} |
483 |
|
484 |
/*
|
485 |
* Returns true iff the first sector pointed to by 'buf' contains at least
|
486 |
* a non-NUL byte.
|
487 |
*
|
488 |
* 'pnum' is set to the number of sectors (including and immediately following
|
489 |
* the first one) that are known to be in the same allocated/unallocated state.
|
490 |
*/
|
491 |
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
492 |
{ |
493 |
int v, i;
|
494 |
|
495 |
if (n <= 0) { |
496 |
*pnum = 0;
|
497 |
return 0; |
498 |
} |
499 |
v = is_not_zero(buf, 512);
|
500 |
for(i = 1; i < n; i++) { |
501 |
buf += 512;
|
502 |
if (v != is_not_zero(buf, 512)) |
503 |
break;
|
504 |
} |
505 |
*pnum = i; |
506 |
return v;
|
507 |
} |
508 |
|
509 |
/*
|
510 |
* Compares two buffers sector by sector. Returns 0 if the first sector of both
|
511 |
* buffers matches, non-zero otherwise.
|
512 |
*
|
513 |
* pnum is set to the number of sectors (including and immediately following
|
514 |
* the first one) that are known to have the same comparison result
|
515 |
*/
|
516 |
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, |
517 |
int *pnum)
|
518 |
{ |
519 |
int res, i;
|
520 |
|
521 |
if (n <= 0) { |
522 |
*pnum = 0;
|
523 |
return 0; |
524 |
} |
525 |
|
526 |
res = !!memcmp(buf1, buf2, 512);
|
527 |
for(i = 1; i < n; i++) { |
528 |
buf1 += 512;
|
529 |
buf2 += 512;
|
530 |
|
531 |
if (!!memcmp(buf1, buf2, 512) != res) { |
532 |
break;
|
533 |
} |
534 |
} |
535 |
|
536 |
*pnum = i; |
537 |
return res;
|
538 |
} |
539 |
|
540 |
#define IO_BUF_SIZE (2 * 1024 * 1024) |
541 |
|
542 |
static int img_convert(int argc, char **argv) |
543 |
{ |
544 |
int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
|
545 |
const char *fmt, *out_fmt, *out_baseimg, *out_filename; |
546 |
BlockDriver *drv; |
547 |
BlockDriverState **bs, *out_bs; |
548 |
int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
549 |
uint64_t bs_sectors; |
550 |
uint8_t * buf; |
551 |
const uint8_t *buf1;
|
552 |
BlockDriverInfo bdi; |
553 |
QEMUOptionParameter *param = NULL;
|
554 |
char *options = NULL; |
555 |
|
556 |
fmt = NULL;
|
557 |
out_fmt = "raw";
|
558 |
out_baseimg = NULL;
|
559 |
flags = 0;
|
560 |
for(;;) {
|
561 |
c = getopt(argc, argv, "f:O:B:hce6o:");
|
562 |
if (c == -1) |
563 |
break;
|
564 |
switch(c) {
|
565 |
case 'h': |
566 |
help(); |
567 |
break;
|
568 |
case 'f': |
569 |
fmt = optarg; |
570 |
break;
|
571 |
case 'O': |
572 |
out_fmt = optarg; |
573 |
break;
|
574 |
case 'B': |
575 |
out_baseimg = optarg; |
576 |
break;
|
577 |
case 'c': |
578 |
flags |= BLOCK_FLAG_COMPRESS; |
579 |
break;
|
580 |
case 'e': |
581 |
flags |= BLOCK_FLAG_ENCRYPT; |
582 |
break;
|
583 |
case '6': |
584 |
flags |= BLOCK_FLAG_COMPAT6; |
585 |
break;
|
586 |
case 'o': |
587 |
options = optarg; |
588 |
break;
|
589 |
} |
590 |
} |
591 |
|
592 |
bs_n = argc - optind - 1;
|
593 |
if (bs_n < 1) help(); |
594 |
|
595 |
out_filename = argv[argc - 1];
|
596 |
|
597 |
if (bs_n > 1 && out_baseimg) |
598 |
error("-B makes no sense when concatenating multiple input images");
|
599 |
|
600 |
bs = calloc(bs_n, sizeof(BlockDriverState *));
|
601 |
if (!bs)
|
602 |
error("Out of memory");
|
603 |
|
604 |
total_sectors = 0;
|
605 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
606 |
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); |
607 |
if (!bs[bs_i])
|
608 |
error("Could not open '%s'", argv[optind + bs_i]);
|
609 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
610 |
total_sectors += bs_sectors; |
611 |
} |
612 |
|
613 |
/* Find driver and parse its options */
|
614 |
drv = bdrv_find_format(out_fmt); |
615 |
if (!drv)
|
616 |
error("Unknown file format '%s'", out_fmt);
|
617 |
|
618 |
if (options && !strcmp(options, "?")) { |
619 |
print_option_help(drv->create_options); |
620 |
free(bs); |
621 |
return 0; |
622 |
} |
623 |
|
624 |
if (options) {
|
625 |
param = parse_option_parameters(options, drv->create_options, param); |
626 |
if (param == NULL) { |
627 |
error("Invalid options for file format '%s'.", out_fmt);
|
628 |
} |
629 |
} else {
|
630 |
param = parse_option_parameters("", drv->create_options, param);
|
631 |
} |
632 |
|
633 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
|
634 |
add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
|
635 |
|
636 |
/* Check if compression is supported */
|
637 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
638 |
QEMUOptionParameter *encryption = |
639 |
get_option_parameter(param, BLOCK_OPT_ENCRYPT); |
640 |
|
641 |
if (!drv->bdrv_write_compressed) {
|
642 |
error("Compression not supported for this file format");
|
643 |
} |
644 |
|
645 |
if (encryption && encryption->value.n) {
|
646 |
error("Compression and encryption not supported at the same time");
|
647 |
} |
648 |
} |
649 |
|
650 |
/* Create the new image */
|
651 |
ret = bdrv_create(drv, out_filename, param); |
652 |
free_option_parameters(param); |
653 |
|
654 |
if (ret < 0) { |
655 |
if (ret == -ENOTSUP) {
|
656 |
error("Formatting not supported for file format '%s'", out_fmt);
|
657 |
} else if (ret == -EFBIG) { |
658 |
error("The image size is too large for file format '%s'", out_fmt);
|
659 |
} else {
|
660 |
error("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret));
|
661 |
} |
662 |
} |
663 |
|
664 |
out_bs = bdrv_new_open(out_filename, out_fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
665 |
|
666 |
bs_i = 0;
|
667 |
bs_offset = 0;
|
668 |
bdrv_get_geometry(bs[0], &bs_sectors);
|
669 |
buf = qemu_malloc(IO_BUF_SIZE); |
670 |
|
671 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
672 |
if (bdrv_get_info(out_bs, &bdi) < 0) |
673 |
error("could not get block driver info");
|
674 |
cluster_size = bdi.cluster_size; |
675 |
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) |
676 |
error("invalid cluster size");
|
677 |
cluster_sectors = cluster_size >> 9;
|
678 |
sector_num = 0;
|
679 |
for(;;) {
|
680 |
int64_t bs_num; |
681 |
int remainder;
|
682 |
uint8_t *buf2; |
683 |
|
684 |
nb_sectors = total_sectors - sector_num; |
685 |
if (nb_sectors <= 0) |
686 |
break;
|
687 |
if (nb_sectors >= cluster_sectors)
|
688 |
n = cluster_sectors; |
689 |
else
|
690 |
n = nb_sectors; |
691 |
|
692 |
bs_num = sector_num - bs_offset; |
693 |
assert (bs_num >= 0);
|
694 |
remainder = n; |
695 |
buf2 = buf; |
696 |
while (remainder > 0) { |
697 |
int nlow;
|
698 |
while (bs_num == bs_sectors) {
|
699 |
bs_i++; |
700 |
assert (bs_i < bs_n); |
701 |
bs_offset += bs_sectors; |
702 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
703 |
bs_num = 0;
|
704 |
/* printf("changing part: sector_num=%lld, "
|
705 |
"bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
|
706 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
707 |
} |
708 |
assert (bs_num < bs_sectors); |
709 |
|
710 |
nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; |
711 |
|
712 |
if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0) |
713 |
error("error while reading");
|
714 |
|
715 |
buf2 += nlow * 512;
|
716 |
bs_num += nlow; |
717 |
|
718 |
remainder -= nlow; |
719 |
} |
720 |
assert (remainder == 0);
|
721 |
|
722 |
if (n < cluster_sectors)
|
723 |
memset(buf + n * 512, 0, cluster_size - n * 512); |
724 |
if (is_not_zero(buf, cluster_size)) {
|
725 |
if (bdrv_write_compressed(out_bs, sector_num, buf,
|
726 |
cluster_sectors) != 0)
|
727 |
error("error while compressing sector %" PRId64,
|
728 |
sector_num); |
729 |
} |
730 |
sector_num += n; |
731 |
} |
732 |
/* signal EOF to align */
|
733 |
bdrv_write_compressed(out_bs, 0, NULL, 0); |
734 |
} else {
|
735 |
sector_num = 0; // total number of sectors converted so far |
736 |
for(;;) {
|
737 |
nb_sectors = total_sectors - sector_num; |
738 |
if (nb_sectors <= 0) |
739 |
break;
|
740 |
if (nb_sectors >= (IO_BUF_SIZE / 512)) |
741 |
n = (IO_BUF_SIZE / 512);
|
742 |
else
|
743 |
n = nb_sectors; |
744 |
|
745 |
while (sector_num - bs_offset >= bs_sectors) {
|
746 |
bs_i ++; |
747 |
assert (bs_i < bs_n); |
748 |
bs_offset += bs_sectors; |
749 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
750 |
/* printf("changing part: sector_num=%lld, bs_i=%d, "
|
751 |
"bs_offset=%lld, bs_sectors=%lld\n",
|
752 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
753 |
} |
754 |
|
755 |
if (n > bs_offset + bs_sectors - sector_num)
|
756 |
n = bs_offset + bs_sectors - sector_num; |
757 |
|
758 |
if (!drv->no_zero_init) {
|
759 |
/* If the output image is being created as a copy on write image,
|
760 |
assume that sectors which are unallocated in the input image
|
761 |
are present in both the output's and input's base images (no
|
762 |
need to copy them). */
|
763 |
if (out_baseimg) {
|
764 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
|
765 |
n, &n1)) { |
766 |
sector_num += n1; |
767 |
continue;
|
768 |
} |
769 |
/* The next 'n1' sectors are allocated in the input image. Copy
|
770 |
only those as they may be followed by unallocated sectors. */
|
771 |
n = n1; |
772 |
} |
773 |
} else {
|
774 |
n1 = n; |
775 |
} |
776 |
|
777 |
if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) |
778 |
error("error while reading");
|
779 |
/* NOTE: at the same time we convert, we do not write zero
|
780 |
sectors to have a chance to compress the image. Ideally, we
|
781 |
should add a specific call to have the info to go faster */
|
782 |
buf1 = buf; |
783 |
while (n > 0) { |
784 |
/* If the output image is being created as a copy on write image,
|
785 |
copy all sectors even the ones containing only NUL bytes,
|
786 |
because they may differ from the sectors in the base image.
|
787 |
|
788 |
If the output is to a host device, we also write out
|
789 |
sectors that are entirely 0, since whatever data was
|
790 |
already there is garbage, not 0s. */
|
791 |
if (drv->no_zero_init || out_baseimg ||
|
792 |
is_allocated_sectors(buf1, n, &n1)) { |
793 |
if (bdrv_write(out_bs, sector_num, buf1, n1) < 0) |
794 |
error("error while writing");
|
795 |
} |
796 |
sector_num += n1; |
797 |
n -= n1; |
798 |
buf1 += n1 * 512;
|
799 |
} |
800 |
} |
801 |
} |
802 |
qemu_free(buf); |
803 |
bdrv_delete(out_bs); |
804 |
for (bs_i = 0; bs_i < bs_n; bs_i++) |
805 |
bdrv_delete(bs[bs_i]); |
806 |
free(bs); |
807 |
return 0; |
808 |
} |
809 |
|
810 |
#ifdef _WIN32
|
811 |
static int64_t get_allocated_file_size(const char *filename) |
812 |
{ |
813 |
typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
814 |
get_compressed_t get_compressed; |
815 |
struct _stati64 st;
|
816 |
|
817 |
/* WinNT support GetCompressedFileSize to determine allocate size */
|
818 |
get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); |
819 |
if (get_compressed) {
|
820 |
DWORD high, low; |
821 |
low = get_compressed(filename, &high); |
822 |
if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) |
823 |
return (((int64_t) high) << 32) + low; |
824 |
} |
825 |
|
826 |
if (_stati64(filename, &st) < 0) |
827 |
return -1; |
828 |
return st.st_size;
|
829 |
} |
830 |
#else
|
831 |
static int64_t get_allocated_file_size(const char *filename) |
832 |
{ |
833 |
struct stat st;
|
834 |
if (stat(filename, &st) < 0) |
835 |
return -1; |
836 |
return (int64_t)st.st_blocks * 512; |
837 |
} |
838 |
#endif
|
839 |
|
840 |
static void dump_snapshots(BlockDriverState *bs) |
841 |
{ |
842 |
QEMUSnapshotInfo *sn_tab, *sn; |
843 |
int nb_sns, i;
|
844 |
char buf[256]; |
845 |
|
846 |
nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
847 |
if (nb_sns <= 0) |
848 |
return;
|
849 |
printf("Snapshot list:\n");
|
850 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); |
851 |
for(i = 0; i < nb_sns; i++) { |
852 |
sn = &sn_tab[i]; |
853 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); |
854 |
} |
855 |
qemu_free(sn_tab); |
856 |
} |
857 |
|
858 |
static int img_info(int argc, char **argv) |
859 |
{ |
860 |
int c;
|
861 |
const char *filename, *fmt; |
862 |
BlockDriverState *bs; |
863 |
char fmt_name[128], size_buf[128], dsize_buf[128]; |
864 |
uint64_t total_sectors; |
865 |
int64_t allocated_size; |
866 |
char backing_filename[1024]; |
867 |
char backing_filename2[1024]; |
868 |
BlockDriverInfo bdi; |
869 |
|
870 |
fmt = NULL;
|
871 |
for(;;) {
|
872 |
c = getopt(argc, argv, "f:h");
|
873 |
if (c == -1) |
874 |
break;
|
875 |
switch(c) {
|
876 |
case 'h': |
877 |
help(); |
878 |
break;
|
879 |
case 'f': |
880 |
fmt = optarg; |
881 |
break;
|
882 |
} |
883 |
} |
884 |
if (optind >= argc)
|
885 |
help(); |
886 |
filename = argv[optind++]; |
887 |
|
888 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); |
889 |
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
|
890 |
bdrv_get_geometry(bs, &total_sectors); |
891 |
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); |
892 |
allocated_size = get_allocated_file_size(filename); |
893 |
if (allocated_size < 0) |
894 |
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
895 |
else
|
896 |
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
|
897 |
allocated_size); |
898 |
printf("image: %s\n"
|
899 |
"file format: %s\n"
|
900 |
"virtual size: %s (%" PRId64 " bytes)\n" |
901 |
"disk size: %s\n",
|
902 |
filename, fmt_name, size_buf, |
903 |
(total_sectors * 512),
|
904 |
dsize_buf); |
905 |
if (bdrv_is_encrypted(bs))
|
906 |
printf("encrypted: yes\n");
|
907 |
if (bdrv_get_info(bs, &bdi) >= 0) { |
908 |
if (bdi.cluster_size != 0) |
909 |
printf("cluster_size: %d\n", bdi.cluster_size);
|
910 |
} |
911 |
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
|
912 |
if (backing_filename[0] != '\0') { |
913 |
path_combine(backing_filename2, sizeof(backing_filename2),
|
914 |
filename, backing_filename); |
915 |
printf("backing file: %s (actual path: %s)\n",
|
916 |
backing_filename, |
917 |
backing_filename2); |
918 |
} |
919 |
dump_snapshots(bs); |
920 |
bdrv_delete(bs); |
921 |
return 0; |
922 |
} |
923 |
|
924 |
#define SNAPSHOT_LIST 1 |
925 |
#define SNAPSHOT_CREATE 2 |
926 |
#define SNAPSHOT_APPLY 3 |
927 |
#define SNAPSHOT_DELETE 4 |
928 |
|
929 |
static int img_snapshot(int argc, char **argv) |
930 |
{ |
931 |
BlockDriverState *bs; |
932 |
QEMUSnapshotInfo sn; |
933 |
char *filename, *snapshot_name = NULL; |
934 |
int c, ret, bdrv_oflags;
|
935 |
int action = 0; |
936 |
qemu_timeval tv; |
937 |
|
938 |
bdrv_oflags = BDRV_O_RDWR; |
939 |
/* Parse commandline parameters */
|
940 |
for(;;) {
|
941 |
c = getopt(argc, argv, "la:c:d:h");
|
942 |
if (c == -1) |
943 |
break;
|
944 |
switch(c) {
|
945 |
case 'h': |
946 |
help(); |
947 |
return 0; |
948 |
case 'l': |
949 |
if (action) {
|
950 |
help(); |
951 |
return 0; |
952 |
} |
953 |
action = SNAPSHOT_LIST; |
954 |
bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
|
955 |
break;
|
956 |
case 'a': |
957 |
if (action) {
|
958 |
help(); |
959 |
return 0; |
960 |
} |
961 |
action = SNAPSHOT_APPLY; |
962 |
snapshot_name = optarg; |
963 |
break;
|
964 |
case 'c': |
965 |
if (action) {
|
966 |
help(); |
967 |
return 0; |
968 |
} |
969 |
action = SNAPSHOT_CREATE; |
970 |
snapshot_name = optarg; |
971 |
break;
|
972 |
case 'd': |
973 |
if (action) {
|
974 |
help(); |
975 |
return 0; |
976 |
} |
977 |
action = SNAPSHOT_DELETE; |
978 |
snapshot_name = optarg; |
979 |
break;
|
980 |
} |
981 |
} |
982 |
|
983 |
if (optind >= argc)
|
984 |
help(); |
985 |
filename = argv[optind++]; |
986 |
|
987 |
/* Open the image */
|
988 |
bs = bdrv_new_open(filename, NULL, bdrv_oflags);
|
989 |
|
990 |
/* Perform the requested action */
|
991 |
switch(action) {
|
992 |
case SNAPSHOT_LIST:
|
993 |
dump_snapshots(bs); |
994 |
break;
|
995 |
|
996 |
case SNAPSHOT_CREATE:
|
997 |
memset(&sn, 0, sizeof(sn)); |
998 |
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
|
999 |
|
1000 |
qemu_gettimeofday(&tv); |
1001 |
sn.date_sec = tv.tv_sec; |
1002 |
sn.date_nsec = tv.tv_usec * 1000;
|
1003 |
|
1004 |
ret = bdrv_snapshot_create(bs, &sn); |
1005 |
if (ret)
|
1006 |
error("Could not create snapshot '%s': %d (%s)",
|
1007 |
snapshot_name, ret, strerror(-ret)); |
1008 |
break;
|
1009 |
|
1010 |
case SNAPSHOT_APPLY:
|
1011 |
ret = bdrv_snapshot_goto(bs, snapshot_name); |
1012 |
if (ret)
|
1013 |
error("Could not apply snapshot '%s': %d (%s)",
|
1014 |
snapshot_name, ret, strerror(-ret)); |
1015 |
break;
|
1016 |
|
1017 |
case SNAPSHOT_DELETE:
|
1018 |
ret = bdrv_snapshot_delete(bs, snapshot_name); |
1019 |
if (ret)
|
1020 |
error("Could not delete snapshot '%s': %d (%s)",
|
1021 |
snapshot_name, ret, strerror(-ret)); |
1022 |
break;
|
1023 |
} |
1024 |
|
1025 |
/* Cleanup */
|
1026 |
bdrv_delete(bs); |
1027 |
|
1028 |
return 0; |
1029 |
} |
1030 |
|
1031 |
static int img_rebase(int argc, char **argv) |
1032 |
{ |
1033 |
BlockDriverState *bs, *bs_old_backing, *bs_new_backing; |
1034 |
BlockDriver *old_backing_drv, *new_backing_drv; |
1035 |
char *filename;
|
1036 |
const char *fmt, *out_basefmt, *out_baseimg; |
1037 |
int c, flags, ret;
|
1038 |
int unsafe = 0; |
1039 |
|
1040 |
/* Parse commandline parameters */
|
1041 |
fmt = NULL;
|
1042 |
out_baseimg = NULL;
|
1043 |
out_basefmt = NULL;
|
1044 |
|
1045 |
for(;;) {
|
1046 |
c = getopt(argc, argv, "uhf:F:b:");
|
1047 |
if (c == -1) |
1048 |
break;
|
1049 |
switch(c) {
|
1050 |
case 'h': |
1051 |
help(); |
1052 |
return 0; |
1053 |
case 'f': |
1054 |
fmt = optarg; |
1055 |
break;
|
1056 |
case 'F': |
1057 |
out_basefmt = optarg; |
1058 |
break;
|
1059 |
case 'b': |
1060 |
out_baseimg = optarg; |
1061 |
break;
|
1062 |
case 'u': |
1063 |
unsafe = 1;
|
1064 |
break;
|
1065 |
} |
1066 |
} |
1067 |
|
1068 |
if ((optind >= argc) || !out_baseimg)
|
1069 |
help(); |
1070 |
filename = argv[optind++]; |
1071 |
|
1072 |
/*
|
1073 |
* Open the images.
|
1074 |
*
|
1075 |
* Ignore the old backing file for unsafe rebase in case we want to correct
|
1076 |
* the reference to a renamed or moved backing file.
|
1077 |
*/
|
1078 |
flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
1079 |
bs = bdrv_new_open(filename, fmt, flags); |
1080 |
|
1081 |
/* Find the right drivers for the backing files */
|
1082 |
old_backing_drv = NULL;
|
1083 |
new_backing_drv = NULL;
|
1084 |
|
1085 |
if (!unsafe && bs->backing_format[0] != '\0') { |
1086 |
old_backing_drv = bdrv_find_format(bs->backing_format); |
1087 |
if (old_backing_drv == NULL) { |
1088 |
error("Invalid format name: '%s'", bs->backing_format);
|
1089 |
} |
1090 |
} |
1091 |
|
1092 |
if (out_basefmt != NULL) { |
1093 |
new_backing_drv = bdrv_find_format(out_basefmt); |
1094 |
if (new_backing_drv == NULL) { |
1095 |
error("Invalid format name: '%s'", out_basefmt);
|
1096 |
} |
1097 |
} |
1098 |
|
1099 |
/* For safe rebasing we need to compare old and new backing file */
|
1100 |
if (unsafe) {
|
1101 |
/* Make the compiler happy */
|
1102 |
bs_old_backing = NULL;
|
1103 |
bs_new_backing = NULL;
|
1104 |
} else {
|
1105 |
char backing_name[1024]; |
1106 |
|
1107 |
bs_old_backing = bdrv_new("old_backing");
|
1108 |
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
1109 |
if (bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS,
|
1110 |
old_backing_drv)) |
1111 |
{ |
1112 |
error("Could not open old backing file '%s'", backing_name);
|
1113 |
return -1; |
1114 |
} |
1115 |
|
1116 |
bs_new_backing = bdrv_new("new_backing");
|
1117 |
if (bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS | BDRV_O_RDWR,
|
1118 |
new_backing_drv)) |
1119 |
{ |
1120 |
error("Could not open new backing file '%s'", out_baseimg);
|
1121 |
return -1; |
1122 |
} |
1123 |
} |
1124 |
|
1125 |
/*
|
1126 |
* Check each unallocated cluster in the COW file. If it is unallocated,
|
1127 |
* accesses go to the backing file. We must therefore compare this cluster
|
1128 |
* in the old and new backing file, and if they differ we need to copy it
|
1129 |
* from the old backing file into the COW file.
|
1130 |
*
|
1131 |
* If qemu-img crashes during this step, no harm is done. The content of
|
1132 |
* the image is the same as the original one at any time.
|
1133 |
*/
|
1134 |
if (!unsafe) {
|
1135 |
uint64_t num_sectors; |
1136 |
uint64_t sector; |
1137 |
int n, n1;
|
1138 |
uint8_t * buf_old; |
1139 |
uint8_t * buf_new; |
1140 |
|
1141 |
buf_old = qemu_malloc(IO_BUF_SIZE); |
1142 |
buf_new = qemu_malloc(IO_BUF_SIZE); |
1143 |
|
1144 |
bdrv_get_geometry(bs, &num_sectors); |
1145 |
|
1146 |
for (sector = 0; sector < num_sectors; sector += n) { |
1147 |
|
1148 |
/* How many sectors can we handle with the next read? */
|
1149 |
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { |
1150 |
n = (IO_BUF_SIZE / 512);
|
1151 |
} else {
|
1152 |
n = num_sectors - sector; |
1153 |
} |
1154 |
|
1155 |
/* If the cluster is allocated, we don't need to take action */
|
1156 |
if (bdrv_is_allocated(bs, sector, n, &n1)) {
|
1157 |
n = n1; |
1158 |
continue;
|
1159 |
} |
1160 |
|
1161 |
/* Read old and new backing file */
|
1162 |
if (bdrv_read(bs_old_backing, sector, buf_old, n) < 0) { |
1163 |
error("error while reading from old backing file");
|
1164 |
} |
1165 |
if (bdrv_read(bs_new_backing, sector, buf_new, n) < 0) { |
1166 |
error("error while reading from new backing file");
|
1167 |
} |
1168 |
|
1169 |
/* If they differ, we need to write to the COW file */
|
1170 |
uint64_t written = 0;
|
1171 |
|
1172 |
while (written < n) {
|
1173 |
int pnum;
|
1174 |
|
1175 |
if (compare_sectors(buf_old + written * 512, |
1176 |
buf_new + written * 512, n - written, &pnum))
|
1177 |
{ |
1178 |
ret = bdrv_write(bs, sector + written, |
1179 |
buf_old + written * 512, pnum);
|
1180 |
if (ret < 0) { |
1181 |
error("Error while writing to COW image: %s",
|
1182 |
strerror(-ret)); |
1183 |
} |
1184 |
} |
1185 |
|
1186 |
written += pnum; |
1187 |
} |
1188 |
} |
1189 |
|
1190 |
qemu_free(buf_old); |
1191 |
qemu_free(buf_new); |
1192 |
} |
1193 |
|
1194 |
/*
|
1195 |
* Change the backing file. All clusters that are different from the old
|
1196 |
* backing file are overwritten in the COW file now, so the visible content
|
1197 |
* doesn't change when we switch the backing file.
|
1198 |
*/
|
1199 |
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
1200 |
if (ret == -ENOSPC) {
|
1201 |
error("Could not change the backing file to '%s': No space left in "
|
1202 |
"the file header", out_baseimg);
|
1203 |
} else if (ret < 0) { |
1204 |
error("Could not change the backing file to '%s': %s",
|
1205 |
out_baseimg, strerror(-ret)); |
1206 |
} |
1207 |
|
1208 |
/*
|
1209 |
* TODO At this point it is possible to check if any clusters that are
|
1210 |
* allocated in the COW file are the same in the backing file. If so, they
|
1211 |
* could be dropped from the COW file. Don't do this before switching the
|
1212 |
* backing file, in case of a crash this would lead to corruption.
|
1213 |
*/
|
1214 |
|
1215 |
/* Cleanup */
|
1216 |
if (!unsafe) {
|
1217 |
bdrv_delete(bs_old_backing); |
1218 |
bdrv_delete(bs_new_backing); |
1219 |
} |
1220 |
|
1221 |
bdrv_delete(bs); |
1222 |
|
1223 |
return 0; |
1224 |
} |
1225 |
|
1226 |
static const img_cmd_t img_cmds[] = { |
1227 |
#define DEF(option, callback, arg_string) \
|
1228 |
{ option, callback }, |
1229 |
#include "qemu-img-cmds.h" |
1230 |
#undef DEF
|
1231 |
#undef GEN_DOCS
|
1232 |
{ NULL, NULL, }, |
1233 |
}; |
1234 |
|
1235 |
int main(int argc, char **argv) |
1236 |
{ |
1237 |
const img_cmd_t *cmd;
|
1238 |
const char *cmdname; |
1239 |
|
1240 |
bdrv_init(); |
1241 |
if (argc < 2) |
1242 |
help(); |
1243 |
cmdname = argv[1];
|
1244 |
argc--; argv++; |
1245 |
|
1246 |
/* find the command */
|
1247 |
for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
1248 |
if (!strcmp(cmdname, cmd->name)) {
|
1249 |
return cmd->handler(argc, argv);
|
1250 |
} |
1251 |
} |
1252 |
|
1253 |
/* not found */
|
1254 |
help(); |
1255 |
return 0; |
1256 |
} |