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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 BRDV_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> |
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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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tcsetattr (0, TCSANOW, &tty);
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atexit(term_exit); |
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} |
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static int read_password(char *buf, int buf_size) |
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{ |
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uint8_t ch; |
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int i, ret;
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printf("password: ");
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fflush(stdout); |
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term_init(); |
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i = 0;
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for(;;) {
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ret = read(0, &ch, 1); |
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if (ret == -1) { |
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if (errno == EAGAIN || errno == EINTR) {
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continue;
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} else {
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ret = -1;
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break;
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} |
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} else if (ret == 0) { |
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ret = -1;
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break;
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} else {
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if (ch == '\r') { |
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ret = 0;
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break;
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} |
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if (i < (buf_size - 1)) |
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buf[i++] = ch; |
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} |
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} |
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term_exit(); |
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buf[i] = '\0';
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printf("\n");
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return ret;
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} |
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#endif
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|
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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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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); |
205 |
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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{ |
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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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} |
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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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} |
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|
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if (base_filename) {
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if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
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error("Backing file not supported for file format '%s'", fmt);
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} |
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} |
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if (base_fmt) {
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if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
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error("Backing file format not supported for file format '%s'", fmt);
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} |
249 |
} |
250 |
} |
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; |
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const char *filename; |
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const char *base_filename = NULL; |
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BlockDriver *drv; |
260 |
QEMUOptionParameter *param = NULL;
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char *options = NULL; |
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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) |
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break;
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switch(c) {
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case 'h': |
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help(); |
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break;
|
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case 'F': |
273 |
base_fmt = optarg; |
274 |
break;
|
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case 'b': |
276 |
base_filename = optarg; |
277 |
break;
|
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case 'f': |
279 |
fmt = optarg; |
280 |
break;
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case 'e': |
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flags |= BLOCK_FLAG_ENCRYPT; |
283 |
break;
|
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case '6': |
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flags |= BLOCK_FLAG_COMPAT6; |
286 |
break;
|
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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, "?")) { |
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print_option_help(drv->create_options); |
300 |
return 0; |
301 |
} |
302 |
|
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/* Create parameter list with default values */
|
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param = parse_option_parameters("", drv->create_options, param);
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set_option_parameter_int(param, BLOCK_OPT_SIZE, -1);
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|
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/* Parse -o options */
|
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if (options) {
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param = parse_option_parameters(options, drv->create_options, param); |
310 |
if (param == NULL) { |
311 |
error("Invalid options for file format '%s'.", fmt);
|
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} |
313 |
} |
314 |
|
315 |
/* Get the filename */
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if (optind >= argc)
|
317 |
help(); |
318 |
filename = argv[optind++]; |
319 |
|
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/* Add size to parameters */
|
321 |
if (optind < argc) {
|
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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("%s: error while creating %s: %s", filename, fmt, strerror(-ret));
|
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("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret));
|
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 *drv, *old_backing_drv, *new_backing_drv; |
1084 |
char *filename;
|
1085 |
const char *fmt, *out_basefmt, *out_baseimg; |
1086 |
int c, flags, ret;
|
1087 |
int unsafe = 0; |
1088 |
|
1089 |
/* Parse commandline parameters */
|
1090 |
fmt = NULL;
|
1091 |
out_baseimg = NULL;
|
1092 |
out_basefmt = NULL;
|
1093 |
|
1094 |
for(;;) {
|
1095 |
c = getopt(argc, argv, "uhf:F:b:");
|
1096 |
if (c == -1) |
1097 |
break;
|
1098 |
switch(c) {
|
1099 |
case 'h': |
1100 |
help(); |
1101 |
return 0; |
1102 |
case 'f': |
1103 |
fmt = optarg; |
1104 |
break;
|
1105 |
case 'F': |
1106 |
out_basefmt = optarg; |
1107 |
break;
|
1108 |
case 'b': |
1109 |
out_baseimg = optarg; |
1110 |
break;
|
1111 |
case 'u': |
1112 |
unsafe = 1;
|
1113 |
break;
|
1114 |
} |
1115 |
} |
1116 |
|
1117 |
if ((optind >= argc) || !out_baseimg)
|
1118 |
help(); |
1119 |
filename = argv[optind++]; |
1120 |
|
1121 |
/*
|
1122 |
* Open the images.
|
1123 |
*
|
1124 |
* Ignore the old backing file for unsafe rebase in case we want to correct
|
1125 |
* the reference to a renamed or moved backing file.
|
1126 |
*/
|
1127 |
bs = bdrv_new("");
|
1128 |
if (!bs)
|
1129 |
error("Not enough memory");
|
1130 |
|
1131 |
drv = NULL;
|
1132 |
if (fmt) {
|
1133 |
drv = bdrv_find_format(fmt); |
1134 |
if (drv == NULL) { |
1135 |
error("Invalid format name: '%s'", fmt);
|
1136 |
} |
1137 |
} |
1138 |
|
1139 |
flags = BRDV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
1140 |
if (bdrv_open2(bs, filename, flags, drv) < 0) { |
1141 |
error("Could not open '%s'", filename);
|
1142 |
} |
1143 |
|
1144 |
/* Find the right drivers for the backing files */
|
1145 |
old_backing_drv = NULL;
|
1146 |
new_backing_drv = NULL;
|
1147 |
|
1148 |
if (!unsafe && bs->backing_format[0] != '\0') { |
1149 |
old_backing_drv = bdrv_find_format(bs->backing_format); |
1150 |
if (old_backing_drv == NULL) { |
1151 |
error("Invalid format name: '%s'", bs->backing_format);
|
1152 |
} |
1153 |
} |
1154 |
|
1155 |
if (out_basefmt != NULL) { |
1156 |
new_backing_drv = bdrv_find_format(out_basefmt); |
1157 |
if (new_backing_drv == NULL) { |
1158 |
error("Invalid format name: '%s'", out_basefmt);
|
1159 |
} |
1160 |
} |
1161 |
|
1162 |
/* For safe rebasing we need to compare old and new backing file */
|
1163 |
if (unsafe) {
|
1164 |
/* Make the compiler happy */
|
1165 |
bs_old_backing = NULL;
|
1166 |
bs_new_backing = NULL;
|
1167 |
} else {
|
1168 |
char backing_name[1024]; |
1169 |
|
1170 |
bs_old_backing = bdrv_new("old_backing");
|
1171 |
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
1172 |
if (bdrv_open2(bs_old_backing, backing_name, BRDV_O_FLAGS,
|
1173 |
old_backing_drv)) |
1174 |
{ |
1175 |
error("Could not open old backing file '%s'", backing_name);
|
1176 |
return -1; |
1177 |
} |
1178 |
|
1179 |
bs_new_backing = bdrv_new("new_backing");
|
1180 |
if (bdrv_open2(bs_new_backing, out_baseimg, BRDV_O_FLAGS | BDRV_O_RDWR,
|
1181 |
new_backing_drv)) |
1182 |
{ |
1183 |
error("Could not open new backing file '%s'", out_baseimg);
|
1184 |
return -1; |
1185 |
} |
1186 |
} |
1187 |
|
1188 |
/*
|
1189 |
* Check each unallocated cluster in the COW file. If it is unallocated,
|
1190 |
* accesses go to the backing file. We must therefore compare this cluster
|
1191 |
* in the old and new backing file, and if they differ we need to copy it
|
1192 |
* from the old backing file into the COW file.
|
1193 |
*
|
1194 |
* If qemu-img crashes during this step, no harm is done. The content of
|
1195 |
* the image is the same as the original one at any time.
|
1196 |
*/
|
1197 |
if (!unsafe) {
|
1198 |
uint64_t num_sectors; |
1199 |
uint64_t sector; |
1200 |
int n, n1;
|
1201 |
uint8_t * buf_old; |
1202 |
uint8_t * buf_new; |
1203 |
|
1204 |
buf_old = qemu_malloc(IO_BUF_SIZE); |
1205 |
buf_new = qemu_malloc(IO_BUF_SIZE); |
1206 |
|
1207 |
bdrv_get_geometry(bs, &num_sectors); |
1208 |
|
1209 |
for (sector = 0; sector < num_sectors; sector += n) { |
1210 |
|
1211 |
/* How many sectors can we handle with the next read? */
|
1212 |
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { |
1213 |
n = (IO_BUF_SIZE / 512);
|
1214 |
} else {
|
1215 |
n = num_sectors - sector; |
1216 |
} |
1217 |
|
1218 |
/* If the cluster is allocated, we don't need to take action */
|
1219 |
if (bdrv_is_allocated(bs, sector, n, &n1)) {
|
1220 |
n = n1; |
1221 |
continue;
|
1222 |
} |
1223 |
|
1224 |
/* Read old and new backing file */
|
1225 |
if (bdrv_read(bs_old_backing, sector, buf_old, n) < 0) { |
1226 |
error("error while reading from old backing file");
|
1227 |
} |
1228 |
if (bdrv_read(bs_new_backing, sector, buf_new, n) < 0) { |
1229 |
error("error while reading from new backing file");
|
1230 |
} |
1231 |
|
1232 |
/* If they differ, we need to write to the COW file */
|
1233 |
uint64_t written = 0;
|
1234 |
|
1235 |
while (written < n) {
|
1236 |
int pnum;
|
1237 |
|
1238 |
if (compare_sectors(buf_old + written * 512, |
1239 |
buf_new + written * 512, n - written, &pnum))
|
1240 |
{ |
1241 |
ret = bdrv_write(bs, sector + written, |
1242 |
buf_old + written * 512, pnum);
|
1243 |
if (ret < 0) { |
1244 |
error("Error while writing to COW image: %s",
|
1245 |
strerror(-ret)); |
1246 |
} |
1247 |
} |
1248 |
|
1249 |
written += pnum; |
1250 |
} |
1251 |
} |
1252 |
|
1253 |
qemu_free(buf_old); |
1254 |
qemu_free(buf_new); |
1255 |
} |
1256 |
|
1257 |
/*
|
1258 |
* Change the backing file. All clusters that are different from the old
|
1259 |
* backing file are overwritten in the COW file now, so the visible content
|
1260 |
* doesn't change when we switch the backing file.
|
1261 |
*/
|
1262 |
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
1263 |
if (ret == -ENOSPC) {
|
1264 |
error("Could not change the backing file to '%s': No space left in "
|
1265 |
"the file header", out_baseimg);
|
1266 |
} else if (ret < 0) { |
1267 |
error("Could not change the backing file to '%s': %s",
|
1268 |
out_baseimg, strerror(-ret)); |
1269 |
} |
1270 |
|
1271 |
/*
|
1272 |
* TODO At this point it is possible to check if any clusters that are
|
1273 |
* allocated in the COW file are the same in the backing file. If so, they
|
1274 |
* could be dropped from the COW file. Don't do this before switching the
|
1275 |
* backing file, in case of a crash this would lead to corruption.
|
1276 |
*/
|
1277 |
|
1278 |
/* Cleanup */
|
1279 |
if (!unsafe) {
|
1280 |
bdrv_delete(bs_old_backing); |
1281 |
bdrv_delete(bs_new_backing); |
1282 |
} |
1283 |
|
1284 |
bdrv_delete(bs); |
1285 |
|
1286 |
return 0; |
1287 |
} |
1288 |
|
1289 |
static const img_cmd_t img_cmds[] = { |
1290 |
#define DEF(option, callback, arg_string) \
|
1291 |
{ option, callback }, |
1292 |
#include "qemu-img-cmds.h" |
1293 |
#undef DEF
|
1294 |
#undef GEN_DOCS
|
1295 |
{ NULL, NULL, }, |
1296 |
}; |
1297 |
|
1298 |
int main(int argc, char **argv) |
1299 |
{ |
1300 |
const img_cmd_t *cmd;
|
1301 |
const char *cmdname; |
1302 |
|
1303 |
bdrv_init(); |
1304 |
if (argc < 2) |
1305 |
help(); |
1306 |
cmdname = argv[1];
|
1307 |
argc--; argv++; |
1308 |
|
1309 |
/* find the command */
|
1310 |
for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
1311 |
if (!strcmp(cmdname, cmd->name)) {
|
1312 |
return cmd->handler(argc, argv);
|
1313 |
} |
1314 |
} |
1315 |
|
1316 |
/* not found */
|
1317 |
help(); |
1318 |
return 0; |
1319 |
} |