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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" |
25 |
#include "qemu-option.h" |
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#include "qemu-error.h" |
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#include "osdep.h" |
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#include "sysemu.h" |
29 |
#include "block_int.h" |
30 |
#include <stdio.h> |
31 |
|
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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 { |
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const char *name; |
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int (*handler)(int argc, char **argv); |
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} img_cmd_t; |
40 |
|
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/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
|
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#define BDRV_O_FLAGS BDRV_O_CACHE_WB
|
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|
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static void format_print(void *opaque, const char *name) |
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{ |
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printf(" %s", name);
|
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} |
48 |
|
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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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|
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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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} |
93 |
|
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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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} |
112 |
|
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#else
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|
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#include <termios.h> |
116 |
|
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static struct termios oldtty; |
118 |
|
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static void term_exit(void) |
120 |
{ |
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tcsetattr (0, TCSANOW, &oldtty);
|
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} |
123 |
|
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static void term_init(void) |
125 |
{ |
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struct termios tty;
|
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|
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tcgetattr (0, &tty);
|
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oldtty = tty; |
130 |
|
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tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP |
132 |
|INLCR|IGNCR|ICRNL|IXON); |
133 |
tty.c_oflag |= OPOST; |
134 |
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); |
135 |
tty.c_cflag &= ~(CSIZE|PARENB); |
136 |
tty.c_cflag |= CS8; |
137 |
tty.c_cc[VMIN] = 1;
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tty.c_cc[VTIME] = 0;
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139 |
|
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tcsetattr (0, TCSANOW, &tty);
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141 |
|
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atexit(term_exit); |
143 |
} |
144 |
|
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static int read_password(char *buf, int buf_size) |
146 |
{ |
147 |
uint8_t ch; |
148 |
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(); |
153 |
i = 0;
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for(;;) {
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ret = read(0, &ch, 1); |
156 |
if (ret == -1) { |
157 |
if (errno == EAGAIN || errno == EINTR) {
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continue;
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159 |
} else {
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ret = -1;
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break;
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162 |
} |
163 |
} else if (ret == 0) { |
164 |
ret = -1;
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break;
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} else {
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167 |
if (ch == '\r') { |
168 |
ret = 0;
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break;
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170 |
} |
171 |
if (i < (buf_size - 1)) |
172 |
buf[i++] = ch; |
173 |
} |
174 |
} |
175 |
term_exit(); |
176 |
buf[i] = '\0';
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printf("\n");
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return ret;
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} |
180 |
#endif
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181 |
|
182 |
static int print_block_option_help(const char *filename, const char *fmt) |
183 |
{ |
184 |
BlockDriver *drv, *proto_drv; |
185 |
QEMUOptionParameter *create_options = NULL;
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|
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/* Find driver and parse its options */
|
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drv = bdrv_find_format(fmt); |
189 |
if (!drv) {
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error_report("Unknown file format '%s'", fmt);
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return 1; |
192 |
} |
193 |
|
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proto_drv = bdrv_find_protocol(filename); |
195 |
if (!proto_drv) {
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error_report("Unknown protocol '%s'", filename);
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return 1; |
198 |
} |
199 |
|
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create_options = append_option_parameters(create_options, |
201 |
drv->create_options); |
202 |
create_options = append_option_parameters(create_options, |
203 |
proto_drv->create_options); |
204 |
print_option_help(create_options); |
205 |
free_option_parameters(create_options); |
206 |
return 0; |
207 |
} |
208 |
|
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static BlockDriverState *bdrv_new_open(const char *filename, |
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const char *fmt, |
211 |
int flags)
|
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{ |
213 |
BlockDriverState *bs; |
214 |
BlockDriver *drv; |
215 |
char password[256]; |
216 |
int ret;
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217 |
|
218 |
bs = bdrv_new("image");
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219 |
|
220 |
if (fmt) {
|
221 |
drv = bdrv_find_format(fmt); |
222 |
if (!drv) {
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error_report("Unknown file format '%s'", fmt);
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224 |
goto fail;
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225 |
} |
226 |
} else {
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227 |
drv = NULL;
|
228 |
} |
229 |
|
230 |
ret = bdrv_open(bs, filename, flags, drv); |
231 |
if (ret < 0) { |
232 |
error_report("Could not open '%s': %s", filename, strerror(-ret));
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goto fail;
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234 |
} |
235 |
|
236 |
if (bdrv_is_encrypted(bs)) {
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printf("Disk image '%s' is encrypted.\n", filename);
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238 |
if (read_password(password, sizeof(password)) < 0) { |
239 |
error_report("No password given");
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240 |
goto fail;
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241 |
} |
242 |
if (bdrv_set_key(bs, password) < 0) { |
243 |
error_report("invalid password");
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244 |
goto fail;
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245 |
} |
246 |
} |
247 |
return bs;
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248 |
fail:
|
249 |
if (bs) {
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bdrv_delete(bs); |
251 |
} |
252 |
return NULL; |
253 |
} |
254 |
|
255 |
static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
256 |
const char *base_filename, |
257 |
const char *base_fmt) |
258 |
{ |
259 |
if (base_filename) {
|
260 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
|
261 |
error_report("Backing file not supported for file format '%s'",
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262 |
fmt); |
263 |
return -1; |
264 |
} |
265 |
} |
266 |
if (base_fmt) {
|
267 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
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error_report("Backing file format not supported for file "
|
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"format '%s'", fmt);
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270 |
return -1; |
271 |
} |
272 |
} |
273 |
return 0; |
274 |
} |
275 |
|
276 |
static int img_create(int argc, char **argv) |
277 |
{ |
278 |
int c, ret = 0; |
279 |
uint64_t img_size = -1;
|
280 |
const char *fmt = "raw"; |
281 |
const char *base_fmt = NULL; |
282 |
const char *filename; |
283 |
const char *base_filename = NULL; |
284 |
char *options = NULL; |
285 |
|
286 |
for(;;) {
|
287 |
c = getopt(argc, argv, "F:b:f:he6o:");
|
288 |
if (c == -1) { |
289 |
break;
|
290 |
} |
291 |
switch(c) {
|
292 |
case '?': |
293 |
case 'h': |
294 |
help(); |
295 |
break;
|
296 |
case 'F': |
297 |
base_fmt = optarg; |
298 |
break;
|
299 |
case 'b': |
300 |
base_filename = optarg; |
301 |
break;
|
302 |
case 'f': |
303 |
fmt = optarg; |
304 |
break;
|
305 |
case 'e': |
306 |
error_report("qemu-img: option -e is deprecated, please use \'-o "
|
307 |
"encryption\' instead!");
|
308 |
return 1; |
309 |
case '6': |
310 |
error_report("qemu-img: option -6 is deprecated, please use \'-o "
|
311 |
"compat6\' instead!");
|
312 |
return 1; |
313 |
case 'o': |
314 |
options = optarg; |
315 |
break;
|
316 |
} |
317 |
} |
318 |
|
319 |
/* Get the filename */
|
320 |
if (optind >= argc) {
|
321 |
help(); |
322 |
} |
323 |
filename = argv[optind++]; |
324 |
|
325 |
/* Get image size, if specified */
|
326 |
if (optind < argc) {
|
327 |
int64_t sval; |
328 |
sval = strtosz_suffix(argv[optind++], NULL, STRTOSZ_DEFSUFFIX_B);
|
329 |
if (sval < 0) { |
330 |
error_report("Invalid image size specified! You may use k, M, G or "
|
331 |
"T suffixes for ");
|
332 |
error_report("kilobytes, megabytes, gigabytes and terabytes.");
|
333 |
ret = -1;
|
334 |
goto out;
|
335 |
} |
336 |
img_size = (uint64_t)sval; |
337 |
} |
338 |
|
339 |
if (options && !strcmp(options, "?")) { |
340 |
ret = print_block_option_help(filename, fmt); |
341 |
goto out;
|
342 |
} |
343 |
|
344 |
ret = bdrv_img_create(filename, fmt, base_filename, base_fmt, |
345 |
options, img_size, BDRV_O_FLAGS); |
346 |
out:
|
347 |
if (ret) {
|
348 |
return 1; |
349 |
} |
350 |
return 0; |
351 |
} |
352 |
|
353 |
/*
|
354 |
* Checks an image for consistency. Exit codes:
|
355 |
*
|
356 |
* 0 - Check completed, image is good
|
357 |
* 1 - Check not completed because of internal errors
|
358 |
* 2 - Check completed, image is corrupted
|
359 |
* 3 - Check completed, image has leaked clusters, but is good otherwise
|
360 |
*/
|
361 |
static int img_check(int argc, char **argv) |
362 |
{ |
363 |
int c, ret;
|
364 |
const char *filename, *fmt; |
365 |
BlockDriverState *bs; |
366 |
BdrvCheckResult result; |
367 |
|
368 |
fmt = NULL;
|
369 |
for(;;) {
|
370 |
c = getopt(argc, argv, "f:h");
|
371 |
if (c == -1) { |
372 |
break;
|
373 |
} |
374 |
switch(c) {
|
375 |
case '?': |
376 |
case 'h': |
377 |
help(); |
378 |
break;
|
379 |
case 'f': |
380 |
fmt = optarg; |
381 |
break;
|
382 |
} |
383 |
} |
384 |
if (optind >= argc) {
|
385 |
help(); |
386 |
} |
387 |
filename = argv[optind++]; |
388 |
|
389 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); |
390 |
if (!bs) {
|
391 |
return 1; |
392 |
} |
393 |
ret = bdrv_check(bs, &result); |
394 |
|
395 |
if (ret == -ENOTSUP) {
|
396 |
error_report("This image format does not support checks");
|
397 |
bdrv_delete(bs); |
398 |
return 1; |
399 |
} |
400 |
|
401 |
if (!(result.corruptions || result.leaks || result.check_errors)) {
|
402 |
printf("No errors were found on the image.\n");
|
403 |
} else {
|
404 |
if (result.corruptions) {
|
405 |
printf("\n%d errors were found on the image.\n"
|
406 |
"Data may be corrupted, or further writes to the image "
|
407 |
"may corrupt it.\n",
|
408 |
result.corruptions); |
409 |
} |
410 |
|
411 |
if (result.leaks) {
|
412 |
printf("\n%d leaked clusters were found on the image.\n"
|
413 |
"This means waste of disk space, but no harm to data.\n",
|
414 |
result.leaks); |
415 |
} |
416 |
|
417 |
if (result.check_errors) {
|
418 |
printf("\n%d internal errors have occurred during the check.\n",
|
419 |
result.check_errors); |
420 |
} |
421 |
} |
422 |
|
423 |
bdrv_delete(bs); |
424 |
|
425 |
if (ret < 0 || result.check_errors) { |
426 |
printf("\nAn error has occurred during the check: %s\n"
|
427 |
"The check is not complete and may have missed error.\n",
|
428 |
strerror(-ret)); |
429 |
return 1; |
430 |
} |
431 |
|
432 |
if (result.corruptions) {
|
433 |
return 2; |
434 |
} else if (result.leaks) { |
435 |
return 3; |
436 |
} else {
|
437 |
return 0; |
438 |
} |
439 |
} |
440 |
|
441 |
static int img_commit(int argc, char **argv) |
442 |
{ |
443 |
int c, ret;
|
444 |
const char *filename, *fmt; |
445 |
BlockDriverState *bs; |
446 |
|
447 |
fmt = NULL;
|
448 |
for(;;) {
|
449 |
c = getopt(argc, argv, "f:h");
|
450 |
if (c == -1) { |
451 |
break;
|
452 |
} |
453 |
switch(c) {
|
454 |
case '?': |
455 |
case 'h': |
456 |
help(); |
457 |
break;
|
458 |
case 'f': |
459 |
fmt = optarg; |
460 |
break;
|
461 |
} |
462 |
} |
463 |
if (optind >= argc) {
|
464 |
help(); |
465 |
} |
466 |
filename = argv[optind++]; |
467 |
|
468 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
469 |
if (!bs) {
|
470 |
return 1; |
471 |
} |
472 |
ret = bdrv_commit(bs); |
473 |
switch(ret) {
|
474 |
case 0: |
475 |
printf("Image committed.\n");
|
476 |
break;
|
477 |
case -ENOENT:
|
478 |
error_report("No disk inserted");
|
479 |
break;
|
480 |
case -EACCES:
|
481 |
error_report("Image is read-only");
|
482 |
break;
|
483 |
case -ENOTSUP:
|
484 |
error_report("Image is already committed");
|
485 |
break;
|
486 |
default:
|
487 |
error_report("Error while committing image");
|
488 |
break;
|
489 |
} |
490 |
|
491 |
bdrv_delete(bs); |
492 |
if (ret) {
|
493 |
return 1; |
494 |
} |
495 |
return 0; |
496 |
} |
497 |
|
498 |
static int is_not_zero(const uint8_t *sector, int len) |
499 |
{ |
500 |
int i;
|
501 |
len >>= 2;
|
502 |
for(i = 0;i < len; i++) { |
503 |
if (((uint32_t *)sector)[i] != 0) |
504 |
return 1; |
505 |
} |
506 |
return 0; |
507 |
} |
508 |
|
509 |
/*
|
510 |
* Returns true iff the first sector pointed to by 'buf' contains at least
|
511 |
* a non-NUL byte.
|
512 |
*
|
513 |
* 'pnum' is set to the number of sectors (including and immediately following
|
514 |
* the first one) that are known to be in the same allocated/unallocated state.
|
515 |
*/
|
516 |
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
517 |
{ |
518 |
int v, i;
|
519 |
|
520 |
if (n <= 0) { |
521 |
*pnum = 0;
|
522 |
return 0; |
523 |
} |
524 |
v = is_not_zero(buf, 512);
|
525 |
for(i = 1; i < n; i++) { |
526 |
buf += 512;
|
527 |
if (v != is_not_zero(buf, 512)) |
528 |
break;
|
529 |
} |
530 |
*pnum = i; |
531 |
return v;
|
532 |
} |
533 |
|
534 |
/*
|
535 |
* Compares two buffers sector by sector. Returns 0 if the first sector of both
|
536 |
* buffers matches, non-zero otherwise.
|
537 |
*
|
538 |
* pnum is set to the number of sectors (including and immediately following
|
539 |
* the first one) that are known to have the same comparison result
|
540 |
*/
|
541 |
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, |
542 |
int *pnum)
|
543 |
{ |
544 |
int res, i;
|
545 |
|
546 |
if (n <= 0) { |
547 |
*pnum = 0;
|
548 |
return 0; |
549 |
} |
550 |
|
551 |
res = !!memcmp(buf1, buf2, 512);
|
552 |
for(i = 1; i < n; i++) { |
553 |
buf1 += 512;
|
554 |
buf2 += 512;
|
555 |
|
556 |
if (!!memcmp(buf1, buf2, 512) != res) { |
557 |
break;
|
558 |
} |
559 |
} |
560 |
|
561 |
*pnum = i; |
562 |
return res;
|
563 |
} |
564 |
|
565 |
#define IO_BUF_SIZE (2 * 1024 * 1024) |
566 |
|
567 |
static int img_convert(int argc, char **argv) |
568 |
{ |
569 |
int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, cluster_sectors; |
570 |
const char *fmt, *out_fmt, *out_baseimg, *out_filename; |
571 |
BlockDriver *drv, *proto_drv; |
572 |
BlockDriverState **bs = NULL, *out_bs = NULL; |
573 |
int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
574 |
uint64_t bs_sectors; |
575 |
uint8_t * buf = NULL;
|
576 |
const uint8_t *buf1;
|
577 |
BlockDriverInfo bdi; |
578 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
579 |
QEMUOptionParameter *out_baseimg_param; |
580 |
char *options = NULL; |
581 |
const char *snapshot_name = NULL; |
582 |
|
583 |
fmt = NULL;
|
584 |
out_fmt = "raw";
|
585 |
out_baseimg = NULL;
|
586 |
compress = 0;
|
587 |
for(;;) {
|
588 |
c = getopt(argc, argv, "f:O:B:s:hce6o:");
|
589 |
if (c == -1) { |
590 |
break;
|
591 |
} |
592 |
switch(c) {
|
593 |
case '?': |
594 |
case 'h': |
595 |
help(); |
596 |
break;
|
597 |
case 'f': |
598 |
fmt = optarg; |
599 |
break;
|
600 |
case 'O': |
601 |
out_fmt = optarg; |
602 |
break;
|
603 |
case 'B': |
604 |
out_baseimg = optarg; |
605 |
break;
|
606 |
case 'c': |
607 |
compress = 1;
|
608 |
break;
|
609 |
case 'e': |
610 |
error_report("qemu-img: option -e is deprecated, please use \'-o "
|
611 |
"encryption\' instead!");
|
612 |
return 1; |
613 |
case '6': |
614 |
error_report("qemu-img: option -6 is deprecated, please use \'-o "
|
615 |
"compat6\' instead!");
|
616 |
return 1; |
617 |
case 'o': |
618 |
options = optarg; |
619 |
break;
|
620 |
case 's': |
621 |
snapshot_name = optarg; |
622 |
break;
|
623 |
} |
624 |
} |
625 |
|
626 |
bs_n = argc - optind - 1;
|
627 |
if (bs_n < 1) { |
628 |
help(); |
629 |
} |
630 |
|
631 |
out_filename = argv[argc - 1];
|
632 |
|
633 |
if (options && !strcmp(options, "?")) { |
634 |
ret = print_block_option_help(out_filename, out_fmt); |
635 |
goto out;
|
636 |
} |
637 |
|
638 |
if (bs_n > 1 && out_baseimg) { |
639 |
error_report("-B makes no sense when concatenating multiple input "
|
640 |
"images");
|
641 |
ret = -1;
|
642 |
goto out;
|
643 |
} |
644 |
|
645 |
bs = qemu_mallocz(bs_n * sizeof(BlockDriverState *));
|
646 |
|
647 |
total_sectors = 0;
|
648 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
649 |
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); |
650 |
if (!bs[bs_i]) {
|
651 |
error_report("Could not open '%s'", argv[optind + bs_i]);
|
652 |
ret = -1;
|
653 |
goto out;
|
654 |
} |
655 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
656 |
total_sectors += bs_sectors; |
657 |
} |
658 |
|
659 |
if (snapshot_name != NULL) { |
660 |
if (bs_n > 1) { |
661 |
error_report("No support for concatenating multiple snapshot\n");
|
662 |
ret = -1;
|
663 |
goto out;
|
664 |
} |
665 |
if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) { |
666 |
error_report("Failed to load snapshot\n");
|
667 |
ret = -1;
|
668 |
goto out;
|
669 |
} |
670 |
} |
671 |
|
672 |
/* Find driver and parse its options */
|
673 |
drv = bdrv_find_format(out_fmt); |
674 |
if (!drv) {
|
675 |
error_report("Unknown file format '%s'", out_fmt);
|
676 |
ret = -1;
|
677 |
goto out;
|
678 |
} |
679 |
|
680 |
proto_drv = bdrv_find_protocol(out_filename); |
681 |
if (!proto_drv) {
|
682 |
error_report("Unknown protocol '%s'", out_filename);
|
683 |
ret = -1;
|
684 |
goto out;
|
685 |
} |
686 |
|
687 |
create_options = append_option_parameters(create_options, |
688 |
drv->create_options); |
689 |
create_options = append_option_parameters(create_options, |
690 |
proto_drv->create_options); |
691 |
|
692 |
if (options) {
|
693 |
param = parse_option_parameters(options, create_options, param); |
694 |
if (param == NULL) { |
695 |
error_report("Invalid options for file format '%s'.", out_fmt);
|
696 |
ret = -1;
|
697 |
goto out;
|
698 |
} |
699 |
} else {
|
700 |
param = parse_option_parameters("", create_options, param);
|
701 |
} |
702 |
|
703 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
|
704 |
ret = add_old_style_options(out_fmt, param, out_baseimg, NULL);
|
705 |
if (ret < 0) { |
706 |
goto out;
|
707 |
} |
708 |
|
709 |
/* Get backing file name if -o backing_file was used */
|
710 |
out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
711 |
if (out_baseimg_param) {
|
712 |
out_baseimg = out_baseimg_param->value.s; |
713 |
} |
714 |
|
715 |
/* Check if compression is supported */
|
716 |
if (compress) {
|
717 |
QEMUOptionParameter *encryption = |
718 |
get_option_parameter(param, BLOCK_OPT_ENCRYPT); |
719 |
|
720 |
if (!drv->bdrv_write_compressed) {
|
721 |
error_report("Compression not supported for this file format");
|
722 |
ret = -1;
|
723 |
goto out;
|
724 |
} |
725 |
|
726 |
if (encryption && encryption->value.n) {
|
727 |
error_report("Compression and encryption not supported at "
|
728 |
"the same time");
|
729 |
ret = -1;
|
730 |
goto out;
|
731 |
} |
732 |
} |
733 |
|
734 |
/* Create the new image */
|
735 |
ret = bdrv_create(drv, out_filename, param); |
736 |
if (ret < 0) { |
737 |
if (ret == -ENOTSUP) {
|
738 |
error_report("Formatting not supported for file format '%s'",
|
739 |
out_fmt); |
740 |
} else if (ret == -EFBIG) { |
741 |
error_report("The image size is too large for file format '%s'",
|
742 |
out_fmt); |
743 |
} else {
|
744 |
error_report("%s: error while converting %s: %s",
|
745 |
out_filename, out_fmt, strerror(-ret)); |
746 |
} |
747 |
goto out;
|
748 |
} |
749 |
|
750 |
out_bs = bdrv_new_open(out_filename, out_fmt, |
751 |
BDRV_O_FLAGS | BDRV_O_RDWR | BDRV_O_NO_FLUSH); |
752 |
if (!out_bs) {
|
753 |
ret = -1;
|
754 |
goto out;
|
755 |
} |
756 |
|
757 |
bs_i = 0;
|
758 |
bs_offset = 0;
|
759 |
bdrv_get_geometry(bs[0], &bs_sectors);
|
760 |
buf = qemu_malloc(IO_BUF_SIZE); |
761 |
|
762 |
if (compress) {
|
763 |
ret = bdrv_get_info(out_bs, &bdi); |
764 |
if (ret < 0) { |
765 |
error_report("could not get block driver info");
|
766 |
goto out;
|
767 |
} |
768 |
cluster_size = bdi.cluster_size; |
769 |
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { |
770 |
error_report("invalid cluster size");
|
771 |
ret = -1;
|
772 |
goto out;
|
773 |
} |
774 |
cluster_sectors = cluster_size >> 9;
|
775 |
sector_num = 0;
|
776 |
for(;;) {
|
777 |
int64_t bs_num; |
778 |
int remainder;
|
779 |
uint8_t *buf2; |
780 |
|
781 |
nb_sectors = total_sectors - sector_num; |
782 |
if (nb_sectors <= 0) |
783 |
break;
|
784 |
if (nb_sectors >= cluster_sectors)
|
785 |
n = cluster_sectors; |
786 |
else
|
787 |
n = nb_sectors; |
788 |
|
789 |
bs_num = sector_num - bs_offset; |
790 |
assert (bs_num >= 0);
|
791 |
remainder = n; |
792 |
buf2 = buf; |
793 |
while (remainder > 0) { |
794 |
int nlow;
|
795 |
while (bs_num == bs_sectors) {
|
796 |
bs_i++; |
797 |
assert (bs_i < bs_n); |
798 |
bs_offset += bs_sectors; |
799 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
800 |
bs_num = 0;
|
801 |
/* printf("changing part: sector_num=%" PRId64 ", "
|
802 |
"bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64
|
803 |
"\n", sector_num, bs_i, bs_offset, bs_sectors); */
|
804 |
} |
805 |
assert (bs_num < bs_sectors); |
806 |
|
807 |
nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; |
808 |
|
809 |
ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); |
810 |
if (ret < 0) { |
811 |
error_report("error while reading");
|
812 |
goto out;
|
813 |
} |
814 |
|
815 |
buf2 += nlow * 512;
|
816 |
bs_num += nlow; |
817 |
|
818 |
remainder -= nlow; |
819 |
} |
820 |
assert (remainder == 0);
|
821 |
|
822 |
if (n < cluster_sectors) {
|
823 |
memset(buf + n * 512, 0, cluster_size - n * 512); |
824 |
} |
825 |
if (is_not_zero(buf, cluster_size)) {
|
826 |
ret = bdrv_write_compressed(out_bs, sector_num, buf, |
827 |
cluster_sectors); |
828 |
if (ret != 0) { |
829 |
error_report("error while compressing sector %" PRId64,
|
830 |
sector_num); |
831 |
goto out;
|
832 |
} |
833 |
} |
834 |
sector_num += n; |
835 |
} |
836 |
/* signal EOF to align */
|
837 |
bdrv_write_compressed(out_bs, 0, NULL, 0); |
838 |
} else {
|
839 |
int has_zero_init = bdrv_has_zero_init(out_bs);
|
840 |
|
841 |
sector_num = 0; // total number of sectors converted so far |
842 |
for(;;) {
|
843 |
nb_sectors = total_sectors - sector_num; |
844 |
if (nb_sectors <= 0) { |
845 |
break;
|
846 |
} |
847 |
if (nb_sectors >= (IO_BUF_SIZE / 512)) { |
848 |
n = (IO_BUF_SIZE / 512);
|
849 |
} else {
|
850 |
n = nb_sectors; |
851 |
} |
852 |
|
853 |
while (sector_num - bs_offset >= bs_sectors) {
|
854 |
bs_i ++; |
855 |
assert (bs_i < bs_n); |
856 |
bs_offset += bs_sectors; |
857 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
858 |
/* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, "
|
859 |
"bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n",
|
860 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
861 |
} |
862 |
|
863 |
if (n > bs_offset + bs_sectors - sector_num) {
|
864 |
n = bs_offset + bs_sectors - sector_num; |
865 |
} |
866 |
|
867 |
if (has_zero_init) {
|
868 |
/* If the output image is being created as a copy on write image,
|
869 |
assume that sectors which are unallocated in the input image
|
870 |
are present in both the output's and input's base images (no
|
871 |
need to copy them). */
|
872 |
if (out_baseimg) {
|
873 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
|
874 |
n, &n1)) { |
875 |
sector_num += n1; |
876 |
continue;
|
877 |
} |
878 |
/* The next 'n1' sectors are allocated in the input image. Copy
|
879 |
only those as they may be followed by unallocated sectors. */
|
880 |
n = n1; |
881 |
} |
882 |
} else {
|
883 |
n1 = n; |
884 |
} |
885 |
|
886 |
ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); |
887 |
if (ret < 0) { |
888 |
error_report("error while reading");
|
889 |
goto out;
|
890 |
} |
891 |
/* NOTE: at the same time we convert, we do not write zero
|
892 |
sectors to have a chance to compress the image. Ideally, we
|
893 |
should add a specific call to have the info to go faster */
|
894 |
buf1 = buf; |
895 |
while (n > 0) { |
896 |
/* If the output image is being created as a copy on write image,
|
897 |
copy all sectors even the ones containing only NUL bytes,
|
898 |
because they may differ from the sectors in the base image.
|
899 |
|
900 |
If the output is to a host device, we also write out
|
901 |
sectors that are entirely 0, since whatever data was
|
902 |
already there is garbage, not 0s. */
|
903 |
if (!has_zero_init || out_baseimg ||
|
904 |
is_allocated_sectors(buf1, n, &n1)) { |
905 |
ret = bdrv_write(out_bs, sector_num, buf1, n1); |
906 |
if (ret < 0) { |
907 |
error_report("error while writing");
|
908 |
goto out;
|
909 |
} |
910 |
} |
911 |
sector_num += n1; |
912 |
n -= n1; |
913 |
buf1 += n1 * 512;
|
914 |
} |
915 |
} |
916 |
} |
917 |
out:
|
918 |
free_option_parameters(create_options); |
919 |
free_option_parameters(param); |
920 |
qemu_free(buf); |
921 |
if (out_bs) {
|
922 |
bdrv_delete(out_bs); |
923 |
} |
924 |
if (bs) {
|
925 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
926 |
if (bs[bs_i]) {
|
927 |
bdrv_delete(bs[bs_i]); |
928 |
} |
929 |
} |
930 |
qemu_free(bs); |
931 |
} |
932 |
if (ret) {
|
933 |
return 1; |
934 |
} |
935 |
return 0; |
936 |
} |
937 |
|
938 |
#ifdef _WIN32
|
939 |
static int64_t get_allocated_file_size(const char *filename) |
940 |
{ |
941 |
typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
942 |
get_compressed_t get_compressed; |
943 |
struct _stati64 st;
|
944 |
|
945 |
/* WinNT support GetCompressedFileSize to determine allocate size */
|
946 |
get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); |
947 |
if (get_compressed) {
|
948 |
DWORD high, low; |
949 |
low = get_compressed(filename, &high); |
950 |
if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) |
951 |
return (((int64_t) high) << 32) + low; |
952 |
} |
953 |
|
954 |
if (_stati64(filename, &st) < 0) |
955 |
return -1; |
956 |
return st.st_size;
|
957 |
} |
958 |
#else
|
959 |
static int64_t get_allocated_file_size(const char *filename) |
960 |
{ |
961 |
struct stat st;
|
962 |
if (stat(filename, &st) < 0) |
963 |
return -1; |
964 |
return (int64_t)st.st_blocks * 512; |
965 |
} |
966 |
#endif
|
967 |
|
968 |
static void dump_snapshots(BlockDriverState *bs) |
969 |
{ |
970 |
QEMUSnapshotInfo *sn_tab, *sn; |
971 |
int nb_sns, i;
|
972 |
char buf[256]; |
973 |
|
974 |
nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
975 |
if (nb_sns <= 0) |
976 |
return;
|
977 |
printf("Snapshot list:\n");
|
978 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); |
979 |
for(i = 0; i < nb_sns; i++) { |
980 |
sn = &sn_tab[i]; |
981 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); |
982 |
} |
983 |
qemu_free(sn_tab); |
984 |
} |
985 |
|
986 |
static int img_info(int argc, char **argv) |
987 |
{ |
988 |
int c;
|
989 |
const char *filename, *fmt; |
990 |
BlockDriverState *bs; |
991 |
char fmt_name[128], size_buf[128], dsize_buf[128]; |
992 |
uint64_t total_sectors; |
993 |
int64_t allocated_size; |
994 |
char backing_filename[1024]; |
995 |
char backing_filename2[1024]; |
996 |
BlockDriverInfo bdi; |
997 |
|
998 |
fmt = NULL;
|
999 |
for(;;) {
|
1000 |
c = getopt(argc, argv, "f:h");
|
1001 |
if (c == -1) { |
1002 |
break;
|
1003 |
} |
1004 |
switch(c) {
|
1005 |
case '?': |
1006 |
case 'h': |
1007 |
help(); |
1008 |
break;
|
1009 |
case 'f': |
1010 |
fmt = optarg; |
1011 |
break;
|
1012 |
} |
1013 |
} |
1014 |
if (optind >= argc) {
|
1015 |
help(); |
1016 |
} |
1017 |
filename = argv[optind++]; |
1018 |
|
1019 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); |
1020 |
if (!bs) {
|
1021 |
return 1; |
1022 |
} |
1023 |
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
|
1024 |
bdrv_get_geometry(bs, &total_sectors); |
1025 |
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); |
1026 |
allocated_size = get_allocated_file_size(filename); |
1027 |
if (allocated_size < 0) { |
1028 |
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
1029 |
} else {
|
1030 |
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
|
1031 |
allocated_size); |
1032 |
} |
1033 |
printf("image: %s\n"
|
1034 |
"file format: %s\n"
|
1035 |
"virtual size: %s (%" PRId64 " bytes)\n" |
1036 |
"disk size: %s\n",
|
1037 |
filename, fmt_name, size_buf, |
1038 |
(total_sectors * 512),
|
1039 |
dsize_buf); |
1040 |
if (bdrv_is_encrypted(bs)) {
|
1041 |
printf("encrypted: yes\n");
|
1042 |
} |
1043 |
if (bdrv_get_info(bs, &bdi) >= 0) { |
1044 |
if (bdi.cluster_size != 0) { |
1045 |
printf("cluster_size: %d\n", bdi.cluster_size);
|
1046 |
} |
1047 |
} |
1048 |
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
|
1049 |
if (backing_filename[0] != '\0') { |
1050 |
path_combine(backing_filename2, sizeof(backing_filename2),
|
1051 |
filename, backing_filename); |
1052 |
printf("backing file: %s (actual path: %s)\n",
|
1053 |
backing_filename, |
1054 |
backing_filename2); |
1055 |
} |
1056 |
dump_snapshots(bs); |
1057 |
bdrv_delete(bs); |
1058 |
return 0; |
1059 |
} |
1060 |
|
1061 |
#define SNAPSHOT_LIST 1 |
1062 |
#define SNAPSHOT_CREATE 2 |
1063 |
#define SNAPSHOT_APPLY 3 |
1064 |
#define SNAPSHOT_DELETE 4 |
1065 |
|
1066 |
static int img_snapshot(int argc, char **argv) |
1067 |
{ |
1068 |
BlockDriverState *bs; |
1069 |
QEMUSnapshotInfo sn; |
1070 |
char *filename, *snapshot_name = NULL; |
1071 |
int c, ret = 0, bdrv_oflags; |
1072 |
int action = 0; |
1073 |
qemu_timeval tv; |
1074 |
|
1075 |
bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR; |
1076 |
/* Parse commandline parameters */
|
1077 |
for(;;) {
|
1078 |
c = getopt(argc, argv, "la:c:d:h");
|
1079 |
if (c == -1) { |
1080 |
break;
|
1081 |
} |
1082 |
switch(c) {
|
1083 |
case '?': |
1084 |
case 'h': |
1085 |
help(); |
1086 |
return 0; |
1087 |
case 'l': |
1088 |
if (action) {
|
1089 |
help(); |
1090 |
return 0; |
1091 |
} |
1092 |
action = SNAPSHOT_LIST; |
1093 |
bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
|
1094 |
break;
|
1095 |
case 'a': |
1096 |
if (action) {
|
1097 |
help(); |
1098 |
return 0; |
1099 |
} |
1100 |
action = SNAPSHOT_APPLY; |
1101 |
snapshot_name = optarg; |
1102 |
break;
|
1103 |
case 'c': |
1104 |
if (action) {
|
1105 |
help(); |
1106 |
return 0; |
1107 |
} |
1108 |
action = SNAPSHOT_CREATE; |
1109 |
snapshot_name = optarg; |
1110 |
break;
|
1111 |
case 'd': |
1112 |
if (action) {
|
1113 |
help(); |
1114 |
return 0; |
1115 |
} |
1116 |
action = SNAPSHOT_DELETE; |
1117 |
snapshot_name = optarg; |
1118 |
break;
|
1119 |
} |
1120 |
} |
1121 |
|
1122 |
if (optind >= argc) {
|
1123 |
help(); |
1124 |
} |
1125 |
filename = argv[optind++]; |
1126 |
|
1127 |
/* Open the image */
|
1128 |
bs = bdrv_new_open(filename, NULL, bdrv_oflags);
|
1129 |
if (!bs) {
|
1130 |
return 1; |
1131 |
} |
1132 |
|
1133 |
/* Perform the requested action */
|
1134 |
switch(action) {
|
1135 |
case SNAPSHOT_LIST:
|
1136 |
dump_snapshots(bs); |
1137 |
break;
|
1138 |
|
1139 |
case SNAPSHOT_CREATE:
|
1140 |
memset(&sn, 0, sizeof(sn)); |
1141 |
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
|
1142 |
|
1143 |
qemu_gettimeofday(&tv); |
1144 |
sn.date_sec = tv.tv_sec; |
1145 |
sn.date_nsec = tv.tv_usec * 1000;
|
1146 |
|
1147 |
ret = bdrv_snapshot_create(bs, &sn); |
1148 |
if (ret) {
|
1149 |
error_report("Could not create snapshot '%s': %d (%s)",
|
1150 |
snapshot_name, ret, strerror(-ret)); |
1151 |
} |
1152 |
break;
|
1153 |
|
1154 |
case SNAPSHOT_APPLY:
|
1155 |
ret = bdrv_snapshot_goto(bs, snapshot_name); |
1156 |
if (ret) {
|
1157 |
error_report("Could not apply snapshot '%s': %d (%s)",
|
1158 |
snapshot_name, ret, strerror(-ret)); |
1159 |
} |
1160 |
break;
|
1161 |
|
1162 |
case SNAPSHOT_DELETE:
|
1163 |
ret = bdrv_snapshot_delete(bs, snapshot_name); |
1164 |
if (ret) {
|
1165 |
error_report("Could not delete snapshot '%s': %d (%s)",
|
1166 |
snapshot_name, ret, strerror(-ret)); |
1167 |
} |
1168 |
break;
|
1169 |
} |
1170 |
|
1171 |
/* Cleanup */
|
1172 |
bdrv_delete(bs); |
1173 |
if (ret) {
|
1174 |
return 1; |
1175 |
} |
1176 |
return 0; |
1177 |
} |
1178 |
|
1179 |
static int img_rebase(int argc, char **argv) |
1180 |
{ |
1181 |
BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; |
1182 |
BlockDriver *old_backing_drv, *new_backing_drv; |
1183 |
char *filename;
|
1184 |
const char *fmt, *out_basefmt, *out_baseimg; |
1185 |
int c, flags, ret;
|
1186 |
int unsafe = 0; |
1187 |
|
1188 |
/* Parse commandline parameters */
|
1189 |
fmt = NULL;
|
1190 |
out_baseimg = NULL;
|
1191 |
out_basefmt = NULL;
|
1192 |
|
1193 |
for(;;) {
|
1194 |
c = getopt(argc, argv, "uhf:F:b:");
|
1195 |
if (c == -1) { |
1196 |
break;
|
1197 |
} |
1198 |
switch(c) {
|
1199 |
case '?': |
1200 |
case 'h': |
1201 |
help(); |
1202 |
return 0; |
1203 |
case 'f': |
1204 |
fmt = optarg; |
1205 |
break;
|
1206 |
case 'F': |
1207 |
out_basefmt = optarg; |
1208 |
break;
|
1209 |
case 'b': |
1210 |
out_baseimg = optarg; |
1211 |
break;
|
1212 |
case 'u': |
1213 |
unsafe = 1;
|
1214 |
break;
|
1215 |
} |
1216 |
} |
1217 |
|
1218 |
if ((optind >= argc) || !out_baseimg) {
|
1219 |
help(); |
1220 |
} |
1221 |
filename = argv[optind++]; |
1222 |
|
1223 |
/*
|
1224 |
* Open the images.
|
1225 |
*
|
1226 |
* Ignore the old backing file for unsafe rebase in case we want to correct
|
1227 |
* the reference to a renamed or moved backing file.
|
1228 |
*/
|
1229 |
flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
1230 |
bs = bdrv_new_open(filename, fmt, flags); |
1231 |
if (!bs) {
|
1232 |
return 1; |
1233 |
} |
1234 |
|
1235 |
/* Find the right drivers for the backing files */
|
1236 |
old_backing_drv = NULL;
|
1237 |
new_backing_drv = NULL;
|
1238 |
|
1239 |
if (!unsafe && bs->backing_format[0] != '\0') { |
1240 |
old_backing_drv = bdrv_find_format(bs->backing_format); |
1241 |
if (old_backing_drv == NULL) { |
1242 |
error_report("Invalid format name: '%s'", bs->backing_format);
|
1243 |
ret = -1;
|
1244 |
goto out;
|
1245 |
} |
1246 |
} |
1247 |
|
1248 |
if (out_basefmt != NULL) { |
1249 |
new_backing_drv = bdrv_find_format(out_basefmt); |
1250 |
if (new_backing_drv == NULL) { |
1251 |
error_report("Invalid format name: '%s'", out_basefmt);
|
1252 |
ret = -1;
|
1253 |
goto out;
|
1254 |
} |
1255 |
} |
1256 |
|
1257 |
/* For safe rebasing we need to compare old and new backing file */
|
1258 |
if (unsafe) {
|
1259 |
/* Make the compiler happy */
|
1260 |
bs_old_backing = NULL;
|
1261 |
bs_new_backing = NULL;
|
1262 |
} else {
|
1263 |
char backing_name[1024]; |
1264 |
|
1265 |
bs_old_backing = bdrv_new("old_backing");
|
1266 |
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
1267 |
ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, |
1268 |
old_backing_drv); |
1269 |
if (ret) {
|
1270 |
error_report("Could not open old backing file '%s'", backing_name);
|
1271 |
goto out;
|
1272 |
} |
1273 |
|
1274 |
bs_new_backing = bdrv_new("new_backing");
|
1275 |
ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS, |
1276 |
new_backing_drv); |
1277 |
if (ret) {
|
1278 |
error_report("Could not open new backing file '%s'", out_baseimg);
|
1279 |
goto out;
|
1280 |
} |
1281 |
} |
1282 |
|
1283 |
/*
|
1284 |
* Check each unallocated cluster in the COW file. If it is unallocated,
|
1285 |
* accesses go to the backing file. We must therefore compare this cluster
|
1286 |
* in the old and new backing file, and if they differ we need to copy it
|
1287 |
* from the old backing file into the COW file.
|
1288 |
*
|
1289 |
* If qemu-img crashes during this step, no harm is done. The content of
|
1290 |
* the image is the same as the original one at any time.
|
1291 |
*/
|
1292 |
if (!unsafe) {
|
1293 |
uint64_t num_sectors; |
1294 |
uint64_t sector; |
1295 |
int n;
|
1296 |
uint8_t * buf_old; |
1297 |
uint8_t * buf_new; |
1298 |
|
1299 |
buf_old = qemu_malloc(IO_BUF_SIZE); |
1300 |
buf_new = qemu_malloc(IO_BUF_SIZE); |
1301 |
|
1302 |
bdrv_get_geometry(bs, &num_sectors); |
1303 |
|
1304 |
for (sector = 0; sector < num_sectors; sector += n) { |
1305 |
|
1306 |
/* How many sectors can we handle with the next read? */
|
1307 |
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { |
1308 |
n = (IO_BUF_SIZE / 512);
|
1309 |
} else {
|
1310 |
n = num_sectors - sector; |
1311 |
} |
1312 |
|
1313 |
/* If the cluster is allocated, we don't need to take action */
|
1314 |
ret = bdrv_is_allocated(bs, sector, n, &n); |
1315 |
if (ret) {
|
1316 |
continue;
|
1317 |
} |
1318 |
|
1319 |
/* Read old and new backing file */
|
1320 |
ret = bdrv_read(bs_old_backing, sector, buf_old, n); |
1321 |
if (ret < 0) { |
1322 |
error_report("error while reading from old backing file");
|
1323 |
goto out;
|
1324 |
} |
1325 |
ret = bdrv_read(bs_new_backing, sector, buf_new, n); |
1326 |
if (ret < 0) { |
1327 |
error_report("error while reading from new backing file");
|
1328 |
goto out;
|
1329 |
} |
1330 |
|
1331 |
/* If they differ, we need to write to the COW file */
|
1332 |
uint64_t written = 0;
|
1333 |
|
1334 |
while (written < n) {
|
1335 |
int pnum;
|
1336 |
|
1337 |
if (compare_sectors(buf_old + written * 512, |
1338 |
buf_new + written * 512, n - written, &pnum))
|
1339 |
{ |
1340 |
ret = bdrv_write(bs, sector + written, |
1341 |
buf_old + written * 512, pnum);
|
1342 |
if (ret < 0) { |
1343 |
error_report("Error while writing to COW image: %s",
|
1344 |
strerror(-ret)); |
1345 |
goto out;
|
1346 |
} |
1347 |
} |
1348 |
|
1349 |
written += pnum; |
1350 |
} |
1351 |
} |
1352 |
|
1353 |
qemu_free(buf_old); |
1354 |
qemu_free(buf_new); |
1355 |
} |
1356 |
|
1357 |
/*
|
1358 |
* Change the backing file. All clusters that are different from the old
|
1359 |
* backing file are overwritten in the COW file now, so the visible content
|
1360 |
* doesn't change when we switch the backing file.
|
1361 |
*/
|
1362 |
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
1363 |
if (ret == -ENOSPC) {
|
1364 |
error_report("Could not change the backing file to '%s': No "
|
1365 |
"space left in the file header", out_baseimg);
|
1366 |
} else if (ret < 0) { |
1367 |
error_report("Could not change the backing file to '%s': %s",
|
1368 |
out_baseimg, strerror(-ret)); |
1369 |
} |
1370 |
|
1371 |
/*
|
1372 |
* TODO At this point it is possible to check if any clusters that are
|
1373 |
* allocated in the COW file are the same in the backing file. If so, they
|
1374 |
* could be dropped from the COW file. Don't do this before switching the
|
1375 |
* backing file, in case of a crash this would lead to corruption.
|
1376 |
*/
|
1377 |
out:
|
1378 |
/* Cleanup */
|
1379 |
if (!unsafe) {
|
1380 |
bdrv_delete(bs_old_backing); |
1381 |
bdrv_delete(bs_new_backing); |
1382 |
} |
1383 |
|
1384 |
bdrv_delete(bs); |
1385 |
if (ret) {
|
1386 |
return 1; |
1387 |
} |
1388 |
return 0; |
1389 |
} |
1390 |
|
1391 |
static int img_resize(int argc, char **argv) |
1392 |
{ |
1393 |
int c, ret, relative;
|
1394 |
const char *filename, *fmt, *size; |
1395 |
int64_t n, total_size; |
1396 |
BlockDriverState *bs = NULL;
|
1397 |
QEMUOptionParameter *param; |
1398 |
QEMUOptionParameter resize_options[] = { |
1399 |
{ |
1400 |
.name = BLOCK_OPT_SIZE, |
1401 |
.type = OPT_SIZE, |
1402 |
.help = "Virtual disk size"
|
1403 |
}, |
1404 |
{ NULL }
|
1405 |
}; |
1406 |
|
1407 |
fmt = NULL;
|
1408 |
for(;;) {
|
1409 |
c = getopt(argc, argv, "f:h");
|
1410 |
if (c == -1) { |
1411 |
break;
|
1412 |
} |
1413 |
switch(c) {
|
1414 |
case '?': |
1415 |
case 'h': |
1416 |
help(); |
1417 |
break;
|
1418 |
case 'f': |
1419 |
fmt = optarg; |
1420 |
break;
|
1421 |
} |
1422 |
} |
1423 |
if (optind + 1 >= argc) { |
1424 |
help(); |
1425 |
} |
1426 |
filename = argv[optind++]; |
1427 |
size = argv[optind++]; |
1428 |
|
1429 |
/* Choose grow, shrink, or absolute resize mode */
|
1430 |
switch (size[0]) { |
1431 |
case '+': |
1432 |
relative = 1;
|
1433 |
size++; |
1434 |
break;
|
1435 |
case '-': |
1436 |
relative = -1;
|
1437 |
size++; |
1438 |
break;
|
1439 |
default:
|
1440 |
relative = 0;
|
1441 |
break;
|
1442 |
} |
1443 |
|
1444 |
/* Parse size */
|
1445 |
param = parse_option_parameters("", resize_options, NULL); |
1446 |
if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) {
|
1447 |
/* Error message already printed when size parsing fails */
|
1448 |
ret = -1;
|
1449 |
goto out;
|
1450 |
} |
1451 |
n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n; |
1452 |
free_option_parameters(param); |
1453 |
|
1454 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
1455 |
if (!bs) {
|
1456 |
ret = -1;
|
1457 |
goto out;
|
1458 |
} |
1459 |
|
1460 |
if (relative) {
|
1461 |
total_size = bdrv_getlength(bs) + n * relative; |
1462 |
} else {
|
1463 |
total_size = n; |
1464 |
} |
1465 |
if (total_size <= 0) { |
1466 |
error_report("New image size must be positive");
|
1467 |
ret = -1;
|
1468 |
goto out;
|
1469 |
} |
1470 |
|
1471 |
ret = bdrv_truncate(bs, total_size); |
1472 |
switch (ret) {
|
1473 |
case 0: |
1474 |
printf("Image resized.\n");
|
1475 |
break;
|
1476 |
case -ENOTSUP:
|
1477 |
error_report("This image format does not support resize");
|
1478 |
break;
|
1479 |
case -EACCES:
|
1480 |
error_report("Image is read-only");
|
1481 |
break;
|
1482 |
default:
|
1483 |
error_report("Error resizing image (%d)", -ret);
|
1484 |
break;
|
1485 |
} |
1486 |
out:
|
1487 |
if (bs) {
|
1488 |
bdrv_delete(bs); |
1489 |
} |
1490 |
if (ret) {
|
1491 |
return 1; |
1492 |
} |
1493 |
return 0; |
1494 |
} |
1495 |
|
1496 |
static const img_cmd_t img_cmds[] = { |
1497 |
#define DEF(option, callback, arg_string) \
|
1498 |
{ option, callback }, |
1499 |
#include "qemu-img-cmds.h" |
1500 |
#undef DEF
|
1501 |
#undef GEN_DOCS
|
1502 |
{ NULL, NULL, }, |
1503 |
}; |
1504 |
|
1505 |
int main(int argc, char **argv) |
1506 |
{ |
1507 |
const img_cmd_t *cmd;
|
1508 |
const char *cmdname; |
1509 |
|
1510 |
error_set_progname(argv[0]);
|
1511 |
|
1512 |
bdrv_init(); |
1513 |
if (argc < 2) |
1514 |
help(); |
1515 |
cmdname = argv[1];
|
1516 |
argc--; argv++; |
1517 |
|
1518 |
/* find the command */
|
1519 |
for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
1520 |
if (!strcmp(cmdname, cmd->name)) {
|
1521 |
return cmd->handler(argc, argv);
|
1522 |
} |
1523 |
} |
1524 |
|
1525 |
/* not found */
|
1526 |
help(); |
1527 |
return 0; |
1528 |
} |