root / qemu-img.c @ 60b1bd4f
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| 1 |
/*
|
|---|---|
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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
|
| 8 |
* 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" |
| 28 |
#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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|
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typedef struct img_cmd_t { |
| 35 |
const char *name; |
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int (*handler)(int argc, char **argv); |
| 37 |
} img_cmd_t; |
| 38 |
|
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/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
|
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#define BRDV_O_FLAGS BDRV_O_CACHE_WB
|
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|
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static void QEMU_NORETURN error(const char *fmt, ...) |
| 43 |
{
|
| 44 |
va_list ap; |
| 45 |
va_start(ap, fmt); |
| 46 |
fprintf(stderr, "qemu-img: ");
|
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vfprintf(stderr, fmt, ap); |
| 48 |
fprintf(stderr, "\n");
|
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exit(1);
|
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va_end(ap); |
| 51 |
} |
| 52 |
|
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static void format_print(void *opaque, const char *name) |
| 54 |
{
|
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printf(" %s", name);
|
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} |
| 57 |
|
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/* Please keep in synch with qemu-img.texi */
|
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static void help(void) |
| 60 |
{
|
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const char *help_msg = |
| 62 |
"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" |
| 69 |
#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> |
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|
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static struct termios oldtty; |
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|
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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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|
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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; |
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|
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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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|
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atexit(term_exit); |
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} |
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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); |
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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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|
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static BlockDriverState *bdrv_new_open(const char *filename, |
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const char *fmt, |
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int readonly)
|
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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 flags = BRDV_O_FLAGS;
|
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|
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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); |
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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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} |
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if (!readonly) {
|
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flags |= BDRV_O_RDWR; |
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} |
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if (bdrv_open2(bs, filename, flags, drv) < 0) { |
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error("Could not open '%s'", filename);
|
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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("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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} |
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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) |
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{
|
| 229 |
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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} |
| 233 |
} |
| 234 |
if (flags & BLOCK_FLAG_COMPAT6) {
|
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if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) { |
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error("VMDK version 6 not supported for file format '%s'", fmt);
|
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} |
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} |
| 239 |
|
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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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} |
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} |
| 245 |
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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} |
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} |
| 251 |
|
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static int img_create(int argc, char **argv) |
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{
|
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int c, ret, flags;
|
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const char *fmt = "raw"; |
| 256 |
const char *base_fmt = NULL; |
| 257 |
const char *filename; |
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const char *base_filename = NULL; |
| 259 |
BlockDriver *drv; |
| 260 |
QEMUOptionParameter *param = NULL;
|
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char *options = NULL; |
| 262 |
|
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flags = 0;
|
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for(;;) {
|
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c = getopt(argc, argv, "F:b:f:he6o:");
|
| 266 |
if (c == -1) |
| 267 |
break;
|
| 268 |
switch(c) {
|
| 269 |
case 'h': |
| 270 |
help(); |
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break;
|
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case 'F': |
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base_fmt = optarg; |
| 274 |
break;
|
| 275 |
case 'b': |
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base_filename = optarg; |
| 277 |
break;
|
| 278 |
case 'f': |
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fmt = optarg; |
| 280 |
break;
|
| 281 |
case 'e': |
| 282 |
flags |= BLOCK_FLAG_ENCRYPT; |
| 283 |
break;
|
| 284 |
case '6': |
| 285 |
flags |= BLOCK_FLAG_COMPAT6; |
| 286 |
break;
|
| 287 |
case 'o': |
| 288 |
options = optarg; |
| 289 |
break;
|
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} |
| 291 |
} |
| 292 |
|
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/* Find driver and parse its options */
|
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drv = bdrv_find_format(fmt); |
| 295 |
if (!drv)
|
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error("Unknown file format '%s'", fmt);
|
| 297 |
|
| 298 |
if (options && !strcmp(options, "?")) { |
| 299 |
print_option_help(drv->create_options); |
| 300 |
return 0; |
| 301 |
} |
| 302 |
|
| 303 |
/* Create parameter list with default values */
|
| 304 |
param = parse_option_parameters("", drv->create_options, param);
|
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set_option_parameter_int(param, BLOCK_OPT_SIZE, -1);
|
| 306 |
|
| 307 |
/* Parse -o options */
|
| 308 |
if (options) {
|
| 309 |
param = parse_option_parameters(options, drv->create_options, param); |
| 310 |
if (param == NULL) { |
| 311 |
error("Invalid options for file format '%s'.", fmt);
|
| 312 |
} |
| 313 |
} |
| 314 |
|
| 315 |
/* Get the filename */
|
| 316 |
if (optind >= argc)
|
| 317 |
help(); |
| 318 |
filename = argv[optind++]; |
| 319 |
|
| 320 |
/* Add size to parameters */
|
| 321 |
if (optind < argc) {
|
| 322 |
set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]); |
| 323 |
} |
| 324 |
|
| 325 |
/* Add old-style options to parameters */
|
| 326 |
add_old_style_options(fmt, param, flags, base_filename, base_fmt); |
| 327 |
|
| 328 |
// The size for the image must always be specified, with one exception:
|
| 329 |
// If we are using a backing file, we can obtain the size from there
|
| 330 |
if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { |
| 331 |
|
| 332 |
QEMUOptionParameter *backing_file = |
| 333 |
get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
| 334 |
QEMUOptionParameter *backing_fmt = |
| 335 |
get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
| 336 |
|
| 337 |
if (backing_file && backing_file->value.s) {
|
| 338 |
BlockDriverState *bs; |
| 339 |
uint64_t size; |
| 340 |
const char *fmt = NULL; |
| 341 |
char buf[32]; |
| 342 |
|
| 343 |
if (backing_fmt && backing_fmt->value.s) {
|
| 344 |
if (bdrv_find_format(backing_fmt->value.s)) {
|
| 345 |
fmt = backing_fmt->value.s; |
| 346 |
} else {
|
| 347 |
error("Unknown backing file format '%s'",
|
| 348 |
backing_fmt->value.s); |
| 349 |
} |
| 350 |
} |
| 351 |
|
| 352 |
bs = bdrv_new_open(backing_file->value.s, fmt, 1);
|
| 353 |
bdrv_get_geometry(bs, &size); |
| 354 |
size *= 512;
|
| 355 |
bdrv_delete(bs); |
| 356 |
|
| 357 |
snprintf(buf, sizeof(buf), "%" PRId64, size); |
| 358 |
set_option_parameter(param, BLOCK_OPT_SIZE, buf); |
| 359 |
} else {
|
| 360 |
error("Image creation needs a size parameter");
|
| 361 |
} |
| 362 |
} |
| 363 |
|
| 364 |
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
| 365 |
print_option_parameters(param); |
| 366 |
puts("");
|
| 367 |
|
| 368 |
ret = bdrv_create(drv, filename, param); |
| 369 |
free_option_parameters(param); |
| 370 |
|
| 371 |
if (ret < 0) { |
| 372 |
if (ret == -ENOTSUP) {
|
| 373 |
error("Formatting or formatting option not supported for file format '%s'", fmt);
|
| 374 |
} else if (ret == -EFBIG) { |
| 375 |
error("The image size is too large for file format '%s'", fmt);
|
| 376 |
} else {
|
| 377 |
error("Error while formatting");
|
| 378 |
} |
| 379 |
} |
| 380 |
return 0; |
| 381 |
} |
| 382 |
|
| 383 |
static int img_check(int argc, char **argv) |
| 384 |
{
|
| 385 |
int c, ret;
|
| 386 |
const char *filename, *fmt; |
| 387 |
BlockDriver *drv; |
| 388 |
BlockDriverState *bs; |
| 389 |
|
| 390 |
fmt = NULL;
|
| 391 |
for(;;) {
|
| 392 |
c = getopt(argc, argv, "f:h");
|
| 393 |
if (c == -1) |
| 394 |
break;
|
| 395 |
switch(c) {
|
| 396 |
case 'h': |
| 397 |
help(); |
| 398 |
break;
|
| 399 |
case 'f': |
| 400 |
fmt = optarg; |
| 401 |
break;
|
| 402 |
} |
| 403 |
} |
| 404 |
if (optind >= argc)
|
| 405 |
help(); |
| 406 |
filename = argv[optind++]; |
| 407 |
|
| 408 |
bs = bdrv_new("");
|
| 409 |
if (!bs)
|
| 410 |
error("Not enough memory");
|
| 411 |
if (fmt) {
|
| 412 |
drv = bdrv_find_format(fmt); |
| 413 |
if (!drv)
|
| 414 |
error("Unknown file format '%s'", fmt);
|
| 415 |
} else {
|
| 416 |
drv = NULL;
|
| 417 |
} |
| 418 |
if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) { |
| 419 |
error("Could not open '%s'", filename);
|
| 420 |
} |
| 421 |
ret = bdrv_check(bs); |
| 422 |
switch(ret) {
|
| 423 |
case 0: |
| 424 |
printf("No errors were found on the image.\n");
|
| 425 |
break;
|
| 426 |
case -ENOTSUP:
|
| 427 |
error("This image format does not support checks");
|
| 428 |
break;
|
| 429 |
default:
|
| 430 |
if (ret < 0) { |
| 431 |
error("An error occurred during the check");
|
| 432 |
} else {
|
| 433 |
printf("%d errors were found on the image.\n", ret);
|
| 434 |
} |
| 435 |
break;
|
| 436 |
} |
| 437 |
|
| 438 |
bdrv_delete(bs); |
| 439 |
return 0; |
| 440 |
} |
| 441 |
|
| 442 |
static int img_commit(int argc, char **argv) |
| 443 |
{
|
| 444 |
int c, ret;
|
| 445 |
const char *filename, *fmt; |
| 446 |
BlockDriver *drv; |
| 447 |
BlockDriverState *bs; |
| 448 |
|
| 449 |
fmt = NULL;
|
| 450 |
for(;;) {
|
| 451 |
c = getopt(argc, argv, "f:h");
|
| 452 |
if (c == -1) |
| 453 |
break;
|
| 454 |
switch(c) {
|
| 455 |
case 'h': |
| 456 |
help(); |
| 457 |
break;
|
| 458 |
case 'f': |
| 459 |
fmt = optarg; |
| 460 |
break;
|
| 461 |
} |
| 462 |
} |
| 463 |
if (optind >= argc)
|
| 464 |
help(); |
| 465 |
filename = argv[optind++]; |
| 466 |
|
| 467 |
bs = bdrv_new("");
|
| 468 |
if (!bs)
|
| 469 |
error("Not enough memory");
|
| 470 |
if (fmt) {
|
| 471 |
drv = bdrv_find_format(fmt); |
| 472 |
if (!drv)
|
| 473 |
error("Unknown file format '%s'", fmt);
|
| 474 |
} else {
|
| 475 |
drv = NULL;
|
| 476 |
} |
| 477 |
if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_RDWR, drv) < 0) { |
| 478 |
error("Could not open '%s'", filename);
|
| 479 |
} |
| 480 |
ret = bdrv_commit(bs); |
| 481 |
switch(ret) {
|
| 482 |
case 0: |
| 483 |
printf("Image committed.\n");
|
| 484 |
break;
|
| 485 |
case -ENOENT:
|
| 486 |
error("No disk inserted");
|
| 487 |
break;
|
| 488 |
case -EACCES:
|
| 489 |
error("Image is read-only");
|
| 490 |
break;
|
| 491 |
case -ENOTSUP:
|
| 492 |
error("Image is already committed");
|
| 493 |
break;
|
| 494 |
default:
|
| 495 |
error("Error while committing image");
|
| 496 |
break;
|
| 497 |
} |
| 498 |
|
| 499 |
bdrv_delete(bs); |
| 500 |
return 0; |
| 501 |
} |
| 502 |
|
| 503 |
static int is_not_zero(const uint8_t *sector, int len) |
| 504 |
{
|
| 505 |
int i;
|
| 506 |
len >>= 2;
|
| 507 |
for(i = 0;i < len; i++) { |
| 508 |
if (((uint32_t *)sector)[i] != 0) |
| 509 |
return 1; |
| 510 |
} |
| 511 |
return 0; |
| 512 |
} |
| 513 |
|
| 514 |
/*
|
| 515 |
* Returns true iff the first sector pointed to by 'buf' contains at least
|
| 516 |
* a non-NUL byte.
|
| 517 |
*
|
| 518 |
* 'pnum' is set to the number of sectors (including and immediately following
|
| 519 |
* the first one) that are known to be in the same allocated/unallocated state.
|
| 520 |
*/
|
| 521 |
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
| 522 |
{
|
| 523 |
int v, i;
|
| 524 |
|
| 525 |
if (n <= 0) { |
| 526 |
*pnum = 0;
|
| 527 |
return 0; |
| 528 |
} |
| 529 |
v = is_not_zero(buf, 512);
|
| 530 |
for(i = 1; i < n; i++) { |
| 531 |
buf += 512;
|
| 532 |
if (v != is_not_zero(buf, 512)) |
| 533 |
break;
|
| 534 |
} |
| 535 |
*pnum = i; |
| 536 |
return v;
|
| 537 |
} |
| 538 |
|
| 539 |
/*
|
| 540 |
* Compares two buffers sector by sector. Returns 0 if the first sector of both
|
| 541 |
* buffers matches, non-zero otherwise.
|
| 542 |
*
|
| 543 |
* pnum is set to the number of sectors (including and immediately following
|
| 544 |
* the first one) that are known to have the same comparison result
|
| 545 |
*/
|
| 546 |
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, |
| 547 |
int *pnum)
|
| 548 |
{
|
| 549 |
int res, i;
|
| 550 |
|
| 551 |
if (n <= 0) { |
| 552 |
*pnum = 0;
|
| 553 |
return 0; |
| 554 |
} |
| 555 |
|
| 556 |
res = !!memcmp(buf1, buf2, 512);
|
| 557 |
for(i = 1; i < n; i++) { |
| 558 |
buf1 += 512;
|
| 559 |
buf2 += 512;
|
| 560 |
|
| 561 |
if (!!memcmp(buf1, buf2, 512) != res) { |
| 562 |
break;
|
| 563 |
} |
| 564 |
} |
| 565 |
|
| 566 |
*pnum = i; |
| 567 |
return res;
|
| 568 |
} |
| 569 |
|
| 570 |
#define IO_BUF_SIZE (2 * 1024 * 1024) |
| 571 |
|
| 572 |
static int img_convert(int argc, char **argv) |
| 573 |
{
|
| 574 |
int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
|
| 575 |
const char *fmt, *out_fmt, *out_baseimg, *out_filename; |
| 576 |
BlockDriver *drv; |
| 577 |
BlockDriverState **bs, *out_bs; |
| 578 |
int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
| 579 |
uint64_t bs_sectors; |
| 580 |
uint8_t * buf; |
| 581 |
const uint8_t *buf1;
|
| 582 |
BlockDriverInfo bdi; |
| 583 |
QEMUOptionParameter *param = NULL;
|
| 584 |
char *options = NULL; |
| 585 |
|
| 586 |
fmt = NULL;
|
| 587 |
out_fmt = "raw";
|
| 588 |
out_baseimg = NULL;
|
| 589 |
flags = 0;
|
| 590 |
for(;;) {
|
| 591 |
c = getopt(argc, argv, "f:O:B:hce6o:");
|
| 592 |
if (c == -1) |
| 593 |
break;
|
| 594 |
switch(c) {
|
| 595 |
case 'h': |
| 596 |
help(); |
| 597 |
break;
|
| 598 |
case 'f': |
| 599 |
fmt = optarg; |
| 600 |
break;
|
| 601 |
case 'O': |
| 602 |
out_fmt = optarg; |
| 603 |
break;
|
| 604 |
case 'B': |
| 605 |
out_baseimg = optarg; |
| 606 |
break;
|
| 607 |
case 'c': |
| 608 |
flags |= BLOCK_FLAG_COMPRESS; |
| 609 |
break;
|
| 610 |
case 'e': |
| 611 |
flags |= BLOCK_FLAG_ENCRYPT; |
| 612 |
break;
|
| 613 |
case '6': |
| 614 |
flags |= BLOCK_FLAG_COMPAT6; |
| 615 |
break;
|
| 616 |
case 'o': |
| 617 |
options = optarg; |
| 618 |
break;
|
| 619 |
} |
| 620 |
} |
| 621 |
|
| 622 |
bs_n = argc - optind - 1;
|
| 623 |
if (bs_n < 1) help(); |
| 624 |
|
| 625 |
out_filename = argv[argc - 1];
|
| 626 |
|
| 627 |
if (bs_n > 1 && out_baseimg) |
| 628 |
error("-B makes no sense when concatenating multiple input images");
|
| 629 |
|
| 630 |
bs = calloc(bs_n, sizeof(BlockDriverState *));
|
| 631 |
if (!bs)
|
| 632 |
error("Out of memory");
|
| 633 |
|
| 634 |
total_sectors = 0;
|
| 635 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
| 636 |
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, 1);
|
| 637 |
if (!bs[bs_i])
|
| 638 |
error("Could not open '%s'", argv[optind + bs_i]);
|
| 639 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
| 640 |
total_sectors += bs_sectors; |
| 641 |
} |
| 642 |
|
| 643 |
/* Find driver and parse its options */
|
| 644 |
drv = bdrv_find_format(out_fmt); |
| 645 |
if (!drv)
|
| 646 |
error("Unknown file format '%s'", out_fmt);
|
| 647 |
|
| 648 |
if (options && !strcmp(options, "?")) { |
| 649 |
print_option_help(drv->create_options); |
| 650 |
free(bs); |
| 651 |
return 0; |
| 652 |
} |
| 653 |
|
| 654 |
if (options) {
|
| 655 |
param = parse_option_parameters(options, drv->create_options, param); |
| 656 |
if (param == NULL) { |
| 657 |
error("Invalid options for file format '%s'.", out_fmt);
|
| 658 |
} |
| 659 |
} else {
|
| 660 |
param = parse_option_parameters("", drv->create_options, param);
|
| 661 |
} |
| 662 |
|
| 663 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
|
| 664 |
add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
|
| 665 |
|
| 666 |
/* Check if compression is supported */
|
| 667 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
| 668 |
QEMUOptionParameter *encryption = |
| 669 |
get_option_parameter(param, BLOCK_OPT_ENCRYPT); |
| 670 |
|
| 671 |
if (!drv->bdrv_write_compressed) {
|
| 672 |
error("Compression not supported for this file format");
|
| 673 |
} |
| 674 |
|
| 675 |
if (encryption && encryption->value.n) {
|
| 676 |
error("Compression and encryption not supported at the same time");
|
| 677 |
} |
| 678 |
} |
| 679 |
|
| 680 |
/* Create the new image */
|
| 681 |
ret = bdrv_create(drv, out_filename, param); |
| 682 |
free_option_parameters(param); |
| 683 |
|
| 684 |
if (ret < 0) { |
| 685 |
if (ret == -ENOTSUP) {
|
| 686 |
error("Formatting not supported for file format '%s'", out_fmt);
|
| 687 |
} else if (ret == -EFBIG) { |
| 688 |
error("The image size is too large for file format '%s'", out_fmt);
|
| 689 |
} else {
|
| 690 |
error("Error while formatting '%s'", out_filename);
|
| 691 |
} |
| 692 |
} |
| 693 |
|
| 694 |
out_bs = bdrv_new_open(out_filename, out_fmt, 0);
|
| 695 |
|
| 696 |
bs_i = 0;
|
| 697 |
bs_offset = 0;
|
| 698 |
bdrv_get_geometry(bs[0], &bs_sectors);
|
| 699 |
buf = qemu_malloc(IO_BUF_SIZE); |
| 700 |
|
| 701 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
| 702 |
if (bdrv_get_info(out_bs, &bdi) < 0) |
| 703 |
error("could not get block driver info");
|
| 704 |
cluster_size = bdi.cluster_size; |
| 705 |
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) |
| 706 |
error("invalid cluster size");
|
| 707 |
cluster_sectors = cluster_size >> 9;
|
| 708 |
sector_num = 0;
|
| 709 |
for(;;) {
|
| 710 |
int64_t bs_num; |
| 711 |
int remainder;
|
| 712 |
uint8_t *buf2; |
| 713 |
|
| 714 |
nb_sectors = total_sectors - sector_num; |
| 715 |
if (nb_sectors <= 0) |
| 716 |
break;
|
| 717 |
if (nb_sectors >= cluster_sectors)
|
| 718 |
n = cluster_sectors; |
| 719 |
else
|
| 720 |
n = nb_sectors; |
| 721 |
|
| 722 |
bs_num = sector_num - bs_offset; |
| 723 |
assert (bs_num >= 0);
|
| 724 |
remainder = n; |
| 725 |
buf2 = buf; |
| 726 |
while (remainder > 0) { |
| 727 |
int nlow;
|
| 728 |
while (bs_num == bs_sectors) {
|
| 729 |
bs_i++; |
| 730 |
assert (bs_i < bs_n); |
| 731 |
bs_offset += bs_sectors; |
| 732 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
| 733 |
bs_num = 0;
|
| 734 |
/* printf("changing part: sector_num=%lld, "
|
| 735 |
"bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
|
| 736 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
| 737 |
} |
| 738 |
assert (bs_num < bs_sectors); |
| 739 |
|
| 740 |
nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; |
| 741 |
|
| 742 |
if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0) |
| 743 |
error("error while reading");
|
| 744 |
|
| 745 |
buf2 += nlow * 512;
|
| 746 |
bs_num += nlow; |
| 747 |
|
| 748 |
remainder -= nlow; |
| 749 |
} |
| 750 |
assert (remainder == 0);
|
| 751 |
|
| 752 |
if (n < cluster_sectors)
|
| 753 |
memset(buf + n * 512, 0, cluster_size - n * 512); |
| 754 |
if (is_not_zero(buf, cluster_size)) {
|
| 755 |
if (bdrv_write_compressed(out_bs, sector_num, buf,
|
| 756 |
cluster_sectors) != 0)
|
| 757 |
error("error while compressing sector %" PRId64,
|
| 758 |
sector_num); |
| 759 |
} |
| 760 |
sector_num += n; |
| 761 |
} |
| 762 |
/* signal EOF to align */
|
| 763 |
bdrv_write_compressed(out_bs, 0, NULL, 0); |
| 764 |
} else {
|
| 765 |
sector_num = 0; // total number of sectors converted so far |
| 766 |
for(;;) {
|
| 767 |
nb_sectors = total_sectors - sector_num; |
| 768 |
if (nb_sectors <= 0) |
| 769 |
break;
|
| 770 |
if (nb_sectors >= (IO_BUF_SIZE / 512)) |
| 771 |
n = (IO_BUF_SIZE / 512);
|
| 772 |
else
|
| 773 |
n = nb_sectors; |
| 774 |
|
| 775 |
while (sector_num - bs_offset >= bs_sectors) {
|
| 776 |
bs_i ++; |
| 777 |
assert (bs_i < bs_n); |
| 778 |
bs_offset += bs_sectors; |
| 779 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
| 780 |
/* printf("changing part: sector_num=%lld, bs_i=%d, "
|
| 781 |
"bs_offset=%lld, bs_sectors=%lld\n",
|
| 782 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
| 783 |
} |
| 784 |
|
| 785 |
if (n > bs_offset + bs_sectors - sector_num)
|
| 786 |
n = bs_offset + bs_sectors - sector_num; |
| 787 |
|
| 788 |
if (!drv->no_zero_init) {
|
| 789 |
/* If the output image is being created as a copy on write image,
|
| 790 |
assume that sectors which are unallocated in the input image
|
| 791 |
are present in both the output's and input's base images (no
|
| 792 |
need to copy them). */
|
| 793 |
if (out_baseimg) {
|
| 794 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
|
| 795 |
n, &n1)) {
|
| 796 |
sector_num += n1; |
| 797 |
continue;
|
| 798 |
} |
| 799 |
/* The next 'n1' sectors are allocated in the input image. Copy
|
| 800 |
only those as they may be followed by unallocated sectors. */
|
| 801 |
n = n1; |
| 802 |
} |
| 803 |
} else {
|
| 804 |
n1 = n; |
| 805 |
} |
| 806 |
|
| 807 |
if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) |
| 808 |
error("error while reading");
|
| 809 |
/* NOTE: at the same time we convert, we do not write zero
|
| 810 |
sectors to have a chance to compress the image. Ideally, we
|
| 811 |
should add a specific call to have the info to go faster */
|
| 812 |
buf1 = buf; |
| 813 |
while (n > 0) { |
| 814 |
/* If the output image is being created as a copy on write image,
|
| 815 |
copy all sectors even the ones containing only NUL bytes,
|
| 816 |
because they may differ from the sectors in the base image.
|
| 817 |
|
| 818 |
If the output is to a host device, we also write out
|
| 819 |
sectors that are entirely 0, since whatever data was
|
| 820 |
already there is garbage, not 0s. */
|
| 821 |
if (drv->no_zero_init || out_baseimg ||
|
| 822 |
is_allocated_sectors(buf1, n, &n1)) {
|
| 823 |
if (bdrv_write(out_bs, sector_num, buf1, n1) < 0) |
| 824 |
error("error while writing");
|
| 825 |
} |
| 826 |
sector_num += n1; |
| 827 |
n -= n1; |
| 828 |
buf1 += n1 * 512;
|
| 829 |
} |
| 830 |
} |
| 831 |
} |
| 832 |
qemu_free(buf); |
| 833 |
bdrv_delete(out_bs); |
| 834 |
for (bs_i = 0; bs_i < bs_n; bs_i++) |
| 835 |
bdrv_delete(bs[bs_i]); |
| 836 |
free(bs); |
| 837 |
return 0; |
| 838 |
} |
| 839 |
|
| 840 |
#ifdef _WIN32
|
| 841 |
static int64_t get_allocated_file_size(const char *filename) |
| 842 |
{
|
| 843 |
typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
| 844 |
get_compressed_t get_compressed; |
| 845 |
struct _stati64 st;
|
| 846 |
|
| 847 |
/* WinNT support GetCompressedFileSize to determine allocate size */
|
| 848 |
get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); |
| 849 |
if (get_compressed) {
|
| 850 |
DWORD high, low; |
| 851 |
low = get_compressed(filename, &high); |
| 852 |
if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) |
| 853 |
return (((int64_t) high) << 32) + low; |
| 854 |
} |
| 855 |
|
| 856 |
if (_stati64(filename, &st) < 0) |
| 857 |
return -1; |
| 858 |
return st.st_size;
|
| 859 |
} |
| 860 |
#else
|
| 861 |
static int64_t get_allocated_file_size(const char *filename) |
| 862 |
{
|
| 863 |
struct stat st;
|
| 864 |
if (stat(filename, &st) < 0) |
| 865 |
return -1; |
| 866 |
return (int64_t)st.st_blocks * 512; |
| 867 |
} |
| 868 |
#endif
|
| 869 |
|
| 870 |
static void dump_snapshots(BlockDriverState *bs) |
| 871 |
{
|
| 872 |
QEMUSnapshotInfo *sn_tab, *sn; |
| 873 |
int nb_sns, i;
|
| 874 |
char buf[256]; |
| 875 |
|
| 876 |
nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
| 877 |
if (nb_sns <= 0) |
| 878 |
return;
|
| 879 |
printf("Snapshot list:\n");
|
| 880 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); |
| 881 |
for(i = 0; i < nb_sns; i++) { |
| 882 |
sn = &sn_tab[i]; |
| 883 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); |
| 884 |
} |
| 885 |
qemu_free(sn_tab); |
| 886 |
} |
| 887 |
|
| 888 |
static int img_info(int argc, char **argv) |
| 889 |
{
|
| 890 |
int c;
|
| 891 |
const char *filename, *fmt; |
| 892 |
BlockDriver *drv; |
| 893 |
BlockDriverState *bs; |
| 894 |
char fmt_name[128], size_buf[128], dsize_buf[128]; |
| 895 |
uint64_t total_sectors; |
| 896 |
int64_t allocated_size; |
| 897 |
char backing_filename[1024]; |
| 898 |
char backing_filename2[1024]; |
| 899 |
BlockDriverInfo bdi; |
| 900 |
|
| 901 |
fmt = NULL;
|
| 902 |
for(;;) {
|
| 903 |
c = getopt(argc, argv, "f:h");
|
| 904 |
if (c == -1) |
| 905 |
break;
|
| 906 |
switch(c) {
|
| 907 |
case 'h': |
| 908 |
help(); |
| 909 |
break;
|
| 910 |
case 'f': |
| 911 |
fmt = optarg; |
| 912 |
break;
|
| 913 |
} |
| 914 |
} |
| 915 |
if (optind >= argc)
|
| 916 |
help(); |
| 917 |
filename = argv[optind++]; |
| 918 |
|
| 919 |
bs = bdrv_new("");
|
| 920 |
if (!bs)
|
| 921 |
error("Not enough memory");
|
| 922 |
if (fmt) {
|
| 923 |
drv = bdrv_find_format(fmt); |
| 924 |
if (!drv)
|
| 925 |
error("Unknown file format '%s'", fmt);
|
| 926 |
} else {
|
| 927 |
drv = NULL;
|
| 928 |
} |
| 929 |
if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_NO_BACKING, drv) < 0) { |
| 930 |
error("Could not open '%s'", filename);
|
| 931 |
} |
| 932 |
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
|
| 933 |
bdrv_get_geometry(bs, &total_sectors); |
| 934 |
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); |
| 935 |
allocated_size = get_allocated_file_size(filename); |
| 936 |
if (allocated_size < 0) |
| 937 |
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
| 938 |
else
|
| 939 |
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
|
| 940 |
allocated_size); |
| 941 |
printf("image: %s\n"
|
| 942 |
"file format: %s\n"
|
| 943 |
"virtual size: %s (%" PRId64 " bytes)\n" |
| 944 |
"disk size: %s\n",
|
| 945 |
filename, fmt_name, size_buf, |
| 946 |
(total_sectors * 512),
|
| 947 |
dsize_buf); |
| 948 |
if (bdrv_is_encrypted(bs))
|
| 949 |
printf("encrypted: yes\n");
|
| 950 |
if (bdrv_get_info(bs, &bdi) >= 0) { |
| 951 |
if (bdi.cluster_size != 0) |
| 952 |
printf("cluster_size: %d\n", bdi.cluster_size);
|
| 953 |
} |
| 954 |
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
|
| 955 |
if (backing_filename[0] != '\0') { |
| 956 |
path_combine(backing_filename2, sizeof(backing_filename2),
|
| 957 |
filename, backing_filename); |
| 958 |
printf("backing file: %s (actual path: %s)\n",
|
| 959 |
backing_filename, |
| 960 |
backing_filename2); |
| 961 |
} |
| 962 |
dump_snapshots(bs); |
| 963 |
bdrv_delete(bs); |
| 964 |
return 0; |
| 965 |
} |
| 966 |
|
| 967 |
#define SNAPSHOT_LIST 1 |
| 968 |
#define SNAPSHOT_CREATE 2 |
| 969 |
#define SNAPSHOT_APPLY 3 |
| 970 |
#define SNAPSHOT_DELETE 4 |
| 971 |
|
| 972 |
static int img_snapshot(int argc, char **argv) |
| 973 |
{
|
| 974 |
BlockDriverState *bs; |
| 975 |
QEMUSnapshotInfo sn; |
| 976 |
char *filename, *snapshot_name = NULL; |
| 977 |
int c, ret, bdrv_oflags;
|
| 978 |
int action = 0; |
| 979 |
qemu_timeval tv; |
| 980 |
|
| 981 |
bdrv_oflags = BDRV_O_RDWR; |
| 982 |
/* Parse commandline parameters */
|
| 983 |
for(;;) {
|
| 984 |
c = getopt(argc, argv, "la:c:d:h");
|
| 985 |
if (c == -1) |
| 986 |
break;
|
| 987 |
switch(c) {
|
| 988 |
case 'h': |
| 989 |
help(); |
| 990 |
return 0; |
| 991 |
case 'l': |
| 992 |
if (action) {
|
| 993 |
help(); |
| 994 |
return 0; |
| 995 |
} |
| 996 |
action = SNAPSHOT_LIST; |
| 997 |
bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
|
| 998 |
break;
|
| 999 |
case 'a': |
| 1000 |
if (action) {
|
| 1001 |
help(); |
| 1002 |
return 0; |
| 1003 |
} |
| 1004 |
action = SNAPSHOT_APPLY; |
| 1005 |
snapshot_name = optarg; |
| 1006 |
break;
|
| 1007 |
case 'c': |
| 1008 |
if (action) {
|
| 1009 |
help(); |
| 1010 |
return 0; |
| 1011 |
} |
| 1012 |
action = SNAPSHOT_CREATE; |
| 1013 |
snapshot_name = optarg; |
| 1014 |
break;
|
| 1015 |
case 'd': |
| 1016 |
if (action) {
|
| 1017 |
help(); |
| 1018 |
return 0; |
| 1019 |
} |
| 1020 |
action = SNAPSHOT_DELETE; |
| 1021 |
snapshot_name = optarg; |
| 1022 |
break;
|
| 1023 |
} |
| 1024 |
} |
| 1025 |
|
| 1026 |
if (optind >= argc)
|
| 1027 |
help(); |
| 1028 |
filename = argv[optind++]; |
| 1029 |
|
| 1030 |
/* Open the image */
|
| 1031 |
bs = bdrv_new("");
|
| 1032 |
if (!bs)
|
| 1033 |
error("Not enough memory");
|
| 1034 |
|
| 1035 |
if (bdrv_open2(bs, filename, bdrv_oflags, NULL) < 0) { |
| 1036 |
error("Could not open '%s'", filename);
|
| 1037 |
} |
| 1038 |
|
| 1039 |
/* Perform the requested action */
|
| 1040 |
switch(action) {
|
| 1041 |
case SNAPSHOT_LIST:
|
| 1042 |
dump_snapshots(bs); |
| 1043 |
break;
|
| 1044 |
|
| 1045 |
case SNAPSHOT_CREATE:
|
| 1046 |
memset(&sn, 0, sizeof(sn)); |
| 1047 |
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
|
| 1048 |
|
| 1049 |
qemu_gettimeofday(&tv); |
| 1050 |
sn.date_sec = tv.tv_sec; |
| 1051 |
sn.date_nsec = tv.tv_usec * 1000;
|
| 1052 |
|
| 1053 |
ret = bdrv_snapshot_create(bs, &sn); |
| 1054 |
if (ret)
|
| 1055 |
error("Could not create snapshot '%s': %d (%s)",
|
| 1056 |
snapshot_name, ret, strerror(-ret)); |
| 1057 |
break;
|
| 1058 |
|
| 1059 |
case SNAPSHOT_APPLY:
|
| 1060 |
ret = bdrv_snapshot_goto(bs, snapshot_name); |
| 1061 |
if (ret)
|
| 1062 |
error("Could not apply snapshot '%s': %d (%s)",
|
| 1063 |
snapshot_name, ret, strerror(-ret)); |
| 1064 |
break;
|
| 1065 |
|
| 1066 |
case SNAPSHOT_DELETE:
|
| 1067 |
ret = bdrv_snapshot_delete(bs, snapshot_name); |
| 1068 |
if (ret)
|
| 1069 |
error("Could not delete snapshot '%s': %d (%s)",
|
| 1070 |
snapshot_name, ret, strerror(-ret)); |
| 1071 |
break;
|
| 1072 |
} |
| 1073 |
|
| 1074 |
/* Cleanup */
|
| 1075 |
bdrv_delete(bs); |
| 1076 |
|
| 1077 |
return 0; |
| 1078 |
} |
| 1079 |
|
| 1080 |
static int img_rebase(int argc, char **argv) |
| 1081 |
{
|
| 1082 |
BlockDriverState *bs, *bs_old_backing, *bs_new_backing; |
| 1083 |
BlockDriver *old_backing_drv, *new_backing_drv; |
| 1084 |
char *filename;
|
| 1085 |
const char *out_basefmt, *out_baseimg; |
| 1086 |
int c, flags, ret;
|
| 1087 |
int unsafe = 0; |
| 1088 |
|
| 1089 |
/* Parse commandline parameters */
|
| 1090 |
out_baseimg = NULL;
|
| 1091 |
out_basefmt = NULL;
|
| 1092 |
|
| 1093 |
for(;;) {
|
| 1094 |
c = getopt(argc, argv, "uhF:b:");
|
| 1095 |
if (c == -1) |
| 1096 |
break;
|
| 1097 |
switch(c) {
|
| 1098 |
case 'h': |
| 1099 |
help(); |
| 1100 |
return 0; |
| 1101 |
case 'F': |
| 1102 |
out_basefmt = optarg; |
| 1103 |
break;
|
| 1104 |
case 'b': |
| 1105 |
out_baseimg = optarg; |
| 1106 |
break;
|
| 1107 |
case 'u': |
| 1108 |
unsafe = 1;
|
| 1109 |
break;
|
| 1110 |
} |
| 1111 |
} |
| 1112 |
|
| 1113 |
if ((optind >= argc) || !out_baseimg)
|
| 1114 |
help(); |
| 1115 |
filename = argv[optind++]; |
| 1116 |
|
| 1117 |
/*
|
| 1118 |
* Open the images.
|
| 1119 |
*
|
| 1120 |
* Ignore the old backing file for unsafe rebase in case we want to correct
|
| 1121 |
* the reference to a renamed or moved backing file.
|
| 1122 |
*/
|
| 1123 |
bs = bdrv_new("");
|
| 1124 |
if (!bs)
|
| 1125 |
error("Not enough memory");
|
| 1126 |
|
| 1127 |
flags = BRDV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
| 1128 |
if (bdrv_open2(bs, filename, flags, NULL) < 0) { |
| 1129 |
error("Could not open '%s'", filename);
|
| 1130 |
} |
| 1131 |
|
| 1132 |
/* Find the right drivers for the backing files */
|
| 1133 |
old_backing_drv = NULL;
|
| 1134 |
new_backing_drv = NULL;
|
| 1135 |
|
| 1136 |
if (!unsafe && bs->backing_format[0] != '\0') { |
| 1137 |
old_backing_drv = bdrv_find_format(bs->backing_format); |
| 1138 |
if (old_backing_drv == NULL) { |
| 1139 |
error("Invalid format name: '%s'", bs->backing_format);
|
| 1140 |
} |
| 1141 |
} |
| 1142 |
|
| 1143 |
if (out_basefmt != NULL) { |
| 1144 |
new_backing_drv = bdrv_find_format(out_basefmt); |
| 1145 |
if (new_backing_drv == NULL) { |
| 1146 |
error("Invalid format name: '%s'", out_basefmt);
|
| 1147 |
} |
| 1148 |
} |
| 1149 |
|
| 1150 |
/* For safe rebasing we need to compare old and new backing file */
|
| 1151 |
if (unsafe) {
|
| 1152 |
/* Make the compiler happy */
|
| 1153 |
bs_old_backing = NULL;
|
| 1154 |
bs_new_backing = NULL;
|
| 1155 |
} else {
|
| 1156 |
char backing_name[1024]; |
| 1157 |
|
| 1158 |
bs_old_backing = bdrv_new("old_backing");
|
| 1159 |
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
| 1160 |
if (bdrv_open2(bs_old_backing, backing_name, BRDV_O_FLAGS,
|
| 1161 |
old_backing_drv)) |
| 1162 |
{
|
| 1163 |
error("Could not open old backing file '%s'", backing_name);
|
| 1164 |
return -1; |
| 1165 |
} |
| 1166 |
|
| 1167 |
bs_new_backing = bdrv_new("new_backing");
|
| 1168 |
if (bdrv_open2(bs_new_backing, out_baseimg, BRDV_O_FLAGS | BDRV_O_RDWR,
|
| 1169 |
new_backing_drv)) |
| 1170 |
{
|
| 1171 |
error("Could not open new backing file '%s'", backing_name);
|
| 1172 |
return -1; |
| 1173 |
} |
| 1174 |
} |
| 1175 |
|
| 1176 |
/*
|
| 1177 |
* Check each unallocated cluster in the COW file. If it is unallocated,
|
| 1178 |
* accesses go to the backing file. We must therefore compare this cluster
|
| 1179 |
* in the old and new backing file, and if they differ we need to copy it
|
| 1180 |
* from the old backing file into the COW file.
|
| 1181 |
*
|
| 1182 |
* If qemu-img crashes during this step, no harm is done. The content of
|
| 1183 |
* the image is the same as the original one at any time.
|
| 1184 |
*/
|
| 1185 |
if (!unsafe) {
|
| 1186 |
uint64_t num_sectors; |
| 1187 |
uint64_t sector; |
| 1188 |
int n, n1;
|
| 1189 |
uint8_t * buf_old; |
| 1190 |
uint8_t * buf_new; |
| 1191 |
|
| 1192 |
buf_old = qemu_malloc(IO_BUF_SIZE); |
| 1193 |
buf_new = qemu_malloc(IO_BUF_SIZE); |
| 1194 |
|
| 1195 |
bdrv_get_geometry(bs, &num_sectors); |
| 1196 |
|
| 1197 |
for (sector = 0; sector < num_sectors; sector += n) { |
| 1198 |
|
| 1199 |
/* How many sectors can we handle with the next read? */
|
| 1200 |
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { |
| 1201 |
n = (IO_BUF_SIZE / 512);
|
| 1202 |
} else {
|
| 1203 |
n = num_sectors - sector; |
| 1204 |
} |
| 1205 |
|
| 1206 |
/* If the cluster is allocated, we don't need to take action */
|
| 1207 |
if (bdrv_is_allocated(bs, sector, n, &n1)) {
|
| 1208 |
n = n1; |
| 1209 |
continue;
|
| 1210 |
} |
| 1211 |
|
| 1212 |
/* Read old and new backing file */
|
| 1213 |
if (bdrv_read(bs_old_backing, sector, buf_old, n) < 0) { |
| 1214 |
error("error while reading from old backing file");
|
| 1215 |
} |
| 1216 |
if (bdrv_read(bs_new_backing, sector, buf_new, n) < 0) { |
| 1217 |
error("error while reading from new backing file");
|
| 1218 |
} |
| 1219 |
|
| 1220 |
/* If they differ, we need to write to the COW file */
|
| 1221 |
uint64_t written = 0;
|
| 1222 |
|
| 1223 |
while (written < n) {
|
| 1224 |
int pnum;
|
| 1225 |
|
| 1226 |
if (compare_sectors(buf_old + written * 512, |
| 1227 |
buf_new + written * 512, n - written, &pnum))
|
| 1228 |
{
|
| 1229 |
ret = bdrv_write(bs, sector + written, |
| 1230 |
buf_old + written * 512, pnum);
|
| 1231 |
if (ret < 0) { |
| 1232 |
error("Error while writing to COW image: %s",
|
| 1233 |
strerror(-ret)); |
| 1234 |
} |
| 1235 |
} |
| 1236 |
|
| 1237 |
written += pnum; |
| 1238 |
} |
| 1239 |
} |
| 1240 |
|
| 1241 |
qemu_free(buf_old); |
| 1242 |
qemu_free(buf_new); |
| 1243 |
} |
| 1244 |
|
| 1245 |
/*
|
| 1246 |
* Change the backing file. All clusters that are different from the old
|
| 1247 |
* backing file are overwritten in the COW file now, so the visible content
|
| 1248 |
* doesn't change when we switch the backing file.
|
| 1249 |
*/
|
| 1250 |
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
| 1251 |
if (ret == -ENOSPC) {
|
| 1252 |
error("Could not change the backing file to '%s': No space left in "
|
| 1253 |
"the file header", out_baseimg);
|
| 1254 |
} else if (ret < 0) { |
| 1255 |
error("Could not change the backing file to '%s': %s",
|
| 1256 |
out_baseimg, strerror(-ret)); |
| 1257 |
} |
| 1258 |
|
| 1259 |
/*
|
| 1260 |
* TODO At this point it is possible to check if any clusters that are
|
| 1261 |
* allocated in the COW file are the same in the backing file. If so, they
|
| 1262 |
* could be dropped from the COW file. Don't do this before switching the
|
| 1263 |
* backing file, in case of a crash this would lead to corruption.
|
| 1264 |
*/
|
| 1265 |
|
| 1266 |
/* Cleanup */
|
| 1267 |
if (!unsafe) {
|
| 1268 |
bdrv_delete(bs_old_backing); |
| 1269 |
bdrv_delete(bs_new_backing); |
| 1270 |
} |
| 1271 |
|
| 1272 |
bdrv_delete(bs); |
| 1273 |
|
| 1274 |
return 0; |
| 1275 |
} |
| 1276 |
|
| 1277 |
static const img_cmd_t img_cmds[] = { |
| 1278 |
#define DEF(option, callback, arg_string) \
|
| 1279 |
{ option, callback },
|
| 1280 |
#include "qemu-img-cmds.h" |
| 1281 |
#undef DEF
|
| 1282 |
#undef GEN_DOCS
|
| 1283 |
{ NULL, NULL, },
|
| 1284 |
}; |
| 1285 |
|
| 1286 |
int main(int argc, char **argv) |
| 1287 |
{
|
| 1288 |
const img_cmd_t *cmd;
|
| 1289 |
const char *cmdname; |
| 1290 |
|
| 1291 |
bdrv_init(); |
| 1292 |
if (argc < 2) |
| 1293 |
help(); |
| 1294 |
cmdname = argv[1];
|
| 1295 |
argc--; argv++; |
| 1296 |
|
| 1297 |
/* find the command */
|
| 1298 |
for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
| 1299 |
if (!strcmp(cmdname, cmd->name)) {
|
| 1300 |
return cmd->handler(argc, argv);
|
| 1301 |
} |
| 1302 |
} |
| 1303 |
|
| 1304 |
/* not found */
|
| 1305 |
help(); |
| 1306 |
return 0; |
| 1307 |
} |