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/*
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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" |
26 |
#include "osdep.h" |
27 |
#include "block_int.h" |
28 |
#include <stdio.h> |
29 |
|
30 |
#ifdef _WIN32
|
31 |
#include <windows.h> |
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#endif
|
33 |
|
34 |
typedef struct img_cmd_t { |
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const char *name; |
36 |
int (*handler)(int argc, char **argv); |
37 |
} img_cmd_t; |
38 |
|
39 |
/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
|
40 |
#define BDRV_O_FLAGS BDRV_O_CACHE_WB
|
41 |
|
42 |
static void error(const char *fmt, ...) |
43 |
{ |
44 |
va_list ap; |
45 |
va_start(ap, fmt); |
46 |
fprintf(stderr, "qemu-img: ");
|
47 |
vfprintf(stderr, fmt, ap); |
48 |
fprintf(stderr, "\n");
|
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va_end(ap); |
50 |
} |
51 |
|
52 |
static void format_print(void *opaque, const char *name) |
53 |
{ |
54 |
printf(" %s", name);
|
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} |
56 |
|
57 |
/* Please keep in synch with qemu-img.texi */
|
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static void help(void) |
59 |
{ |
60 |
const char *help_msg = |
61 |
"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" |
68 |
#include "qemu-img-cmds.h" |
69 |
#undef DEF
|
70 |
#undef GEN_DOCS
|
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"\n"
|
72 |
"Command parameters:\n"
|
73 |
" 'filename' is a disk image filename\n"
|
74 |
" 'fmt' is the disk image format. It is guessed automatically in most cases\n"
|
75 |
" 'size' is the disk image size in bytes. Optional suffixes\n"
|
76 |
" 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n"
|
77 |
" and T (terabyte, 1024G) are supported. 'b' is ignored.\n"
|
78 |
" 'output_filename' is the destination disk image filename\n"
|
79 |
" 'output_fmt' is the destination format\n"
|
80 |
" '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"
|
82 |
" used format\n"
|
83 |
" '-c' indicates that target image must be compressed (qcow format only)\n"
|
84 |
" '-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"
|
89 |
"Parameters to snapshot subcommand:\n"
|
90 |
" '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"
|
92 |
" '-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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} |
101 |
|
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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) |
105 |
{ |
106 |
int c, i;
|
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printf("Password: ");
|
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fflush(stdout); |
109 |
i = 0;
|
110 |
for(;;) {
|
111 |
c = getchar(); |
112 |
if (c == '\n') |
113 |
break;
|
114 |
if (i < (buf_size - 1)) |
115 |
buf[i++] = c; |
116 |
} |
117 |
buf[i] = '\0';
|
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return 0; |
119 |
} |
120 |
|
121 |
#else
|
122 |
|
123 |
#include <termios.h> |
124 |
|
125 |
static struct termios oldtty; |
126 |
|
127 |
static void term_exit(void) |
128 |
{ |
129 |
tcsetattr (0, TCSANOW, &oldtty);
|
130 |
} |
131 |
|
132 |
static void term_init(void) |
133 |
{ |
134 |
struct termios tty;
|
135 |
|
136 |
tcgetattr (0, &tty);
|
137 |
oldtty = tty; |
138 |
|
139 |
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP |
140 |
|INLCR|IGNCR|ICRNL|IXON); |
141 |
tty.c_oflag |= OPOST; |
142 |
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); |
143 |
tty.c_cflag &= ~(CSIZE|PARENB); |
144 |
tty.c_cflag |= CS8; |
145 |
tty.c_cc[VMIN] = 1;
|
146 |
tty.c_cc[VTIME] = 0;
|
147 |
|
148 |
tcsetattr (0, TCSANOW, &tty);
|
149 |
|
150 |
atexit(term_exit); |
151 |
} |
152 |
|
153 |
static int read_password(char *buf, int buf_size) |
154 |
{ |
155 |
uint8_t ch; |
156 |
int i, ret;
|
157 |
|
158 |
printf("password: ");
|
159 |
fflush(stdout); |
160 |
term_init(); |
161 |
i = 0;
|
162 |
for(;;) {
|
163 |
ret = read(0, &ch, 1); |
164 |
if (ret == -1) { |
165 |
if (errno == EAGAIN || errno == EINTR) {
|
166 |
continue;
|
167 |
} else {
|
168 |
ret = -1;
|
169 |
break;
|
170 |
} |
171 |
} else if (ret == 0) { |
172 |
ret = -1;
|
173 |
break;
|
174 |
} else {
|
175 |
if (ch == '\r') { |
176 |
ret = 0;
|
177 |
break;
|
178 |
} |
179 |
if (i < (buf_size - 1)) |
180 |
buf[i++] = ch; |
181 |
} |
182 |
} |
183 |
term_exit(); |
184 |
buf[i] = '\0';
|
185 |
printf("\n");
|
186 |
return ret;
|
187 |
} |
188 |
#endif
|
189 |
|
190 |
static BlockDriverState *bdrv_new_open(const char *filename, |
191 |
const char *fmt, |
192 |
int flags)
|
193 |
{ |
194 |
BlockDriverState *bs; |
195 |
BlockDriver *drv; |
196 |
char password[256]; |
197 |
|
198 |
bs = bdrv_new("");
|
199 |
if (!bs) {
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200 |
error("Not enough memory");
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201 |
goto fail;
|
202 |
} |
203 |
if (fmt) {
|
204 |
drv = bdrv_find_format(fmt); |
205 |
if (!drv) {
|
206 |
error("Unknown file format '%s'", fmt);
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207 |
goto fail;
|
208 |
} |
209 |
} else {
|
210 |
drv = NULL;
|
211 |
} |
212 |
if (bdrv_open(bs, filename, flags, drv) < 0) { |
213 |
error("Could not open '%s'", filename);
|
214 |
goto fail;
|
215 |
} |
216 |
if (bdrv_is_encrypted(bs)) {
|
217 |
printf("Disk image '%s' is encrypted.\n", filename);
|
218 |
if (read_password(password, sizeof(password)) < 0) { |
219 |
error("No password given");
|
220 |
goto fail;
|
221 |
} |
222 |
if (bdrv_set_key(bs, password) < 0) { |
223 |
error("invalid password");
|
224 |
goto fail;
|
225 |
} |
226 |
} |
227 |
return bs;
|
228 |
fail:
|
229 |
if (bs) {
|
230 |
bdrv_delete(bs); |
231 |
} |
232 |
return NULL; |
233 |
} |
234 |
|
235 |
static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
236 |
int flags, const char *base_filename, const char *base_fmt) |
237 |
{ |
238 |
if (flags & BLOCK_FLAG_ENCRYPT) {
|
239 |
if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) { |
240 |
error("Encryption not supported for file format '%s'", fmt);
|
241 |
return -1; |
242 |
} |
243 |
} |
244 |
if (flags & BLOCK_FLAG_COMPAT6) {
|
245 |
if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) { |
246 |
error("VMDK version 6 not supported for file format '%s'", fmt);
|
247 |
return -1; |
248 |
} |
249 |
} |
250 |
|
251 |
if (base_filename) {
|
252 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
|
253 |
error("Backing file not supported for file format '%s'", fmt);
|
254 |
return -1; |
255 |
} |
256 |
} |
257 |
if (base_fmt) {
|
258 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
259 |
error("Backing file format not supported for file format '%s'", fmt);
|
260 |
return -1; |
261 |
} |
262 |
} |
263 |
return 0; |
264 |
} |
265 |
|
266 |
static int img_create(int argc, char **argv) |
267 |
{ |
268 |
int c, ret = 0, flags; |
269 |
const char *fmt = "raw"; |
270 |
const char *base_fmt = NULL; |
271 |
const char *filename; |
272 |
const char *base_filename = NULL; |
273 |
BlockDriver *drv, *proto_drv; |
274 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
275 |
char *options = NULL; |
276 |
|
277 |
flags = 0;
|
278 |
for(;;) {
|
279 |
c = getopt(argc, argv, "F:b:f:he6o:");
|
280 |
if (c == -1) |
281 |
break;
|
282 |
switch(c) {
|
283 |
case 'h': |
284 |
help(); |
285 |
break;
|
286 |
case 'F': |
287 |
base_fmt = optarg; |
288 |
break;
|
289 |
case 'b': |
290 |
base_filename = optarg; |
291 |
break;
|
292 |
case 'f': |
293 |
fmt = optarg; |
294 |
break;
|
295 |
case 'e': |
296 |
flags |= BLOCK_FLAG_ENCRYPT; |
297 |
break;
|
298 |
case '6': |
299 |
flags |= BLOCK_FLAG_COMPAT6; |
300 |
break;
|
301 |
case 'o': |
302 |
options = optarg; |
303 |
break;
|
304 |
} |
305 |
} |
306 |
|
307 |
/* Get the filename */
|
308 |
if (optind >= argc)
|
309 |
help(); |
310 |
filename = argv[optind++]; |
311 |
|
312 |
/* Find driver and parse its options */
|
313 |
drv = bdrv_find_format(fmt); |
314 |
if (!drv) {
|
315 |
error("Unknown file format '%s'", fmt);
|
316 |
return 1; |
317 |
} |
318 |
|
319 |
proto_drv = bdrv_find_protocol(filename); |
320 |
if (!proto_drv) {
|
321 |
error("Unknown protocol '%s'", filename);
|
322 |
return 1; |
323 |
} |
324 |
|
325 |
create_options = append_option_parameters(create_options, |
326 |
drv->create_options); |
327 |
create_options = append_option_parameters(create_options, |
328 |
proto_drv->create_options); |
329 |
|
330 |
if (options && !strcmp(options, "?")) { |
331 |
print_option_help(create_options); |
332 |
goto out;
|
333 |
} |
334 |
|
335 |
/* Create parameter list with default values */
|
336 |
param = parse_option_parameters("", create_options, param);
|
337 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, -1);
|
338 |
|
339 |
/* Parse -o options */
|
340 |
if (options) {
|
341 |
param = parse_option_parameters(options, create_options, param); |
342 |
if (param == NULL) { |
343 |
error("Invalid options for file format '%s'.", fmt);
|
344 |
ret = -1;
|
345 |
goto out;
|
346 |
} |
347 |
} |
348 |
|
349 |
/* Add size to parameters */
|
350 |
if (optind < argc) {
|
351 |
set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]); |
352 |
} |
353 |
|
354 |
/* Add old-style options to parameters */
|
355 |
ret = add_old_style_options(fmt, param, flags, base_filename, base_fmt); |
356 |
if (ret < 0) { |
357 |
goto out;
|
358 |
} |
359 |
|
360 |
// The size for the image must always be specified, with one exception:
|
361 |
// If we are using a backing file, we can obtain the size from there
|
362 |
if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { |
363 |
|
364 |
QEMUOptionParameter *backing_file = |
365 |
get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
366 |
QEMUOptionParameter *backing_fmt = |
367 |
get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
368 |
|
369 |
if (backing_file && backing_file->value.s) {
|
370 |
BlockDriverState *bs; |
371 |
uint64_t size; |
372 |
const char *fmt = NULL; |
373 |
char buf[32]; |
374 |
|
375 |
if (backing_fmt && backing_fmt->value.s) {
|
376 |
if (bdrv_find_format(backing_fmt->value.s)) {
|
377 |
fmt = backing_fmt->value.s; |
378 |
} else {
|
379 |
error("Unknown backing file format '%s'",
|
380 |
backing_fmt->value.s); |
381 |
ret = -1;
|
382 |
goto out;
|
383 |
} |
384 |
} |
385 |
|
386 |
bs = bdrv_new_open(backing_file->value.s, fmt, BDRV_O_FLAGS); |
387 |
if (!bs) {
|
388 |
ret = -1;
|
389 |
goto out;
|
390 |
} |
391 |
bdrv_get_geometry(bs, &size); |
392 |
size *= 512;
|
393 |
bdrv_delete(bs); |
394 |
|
395 |
snprintf(buf, sizeof(buf), "%" PRId64, size); |
396 |
set_option_parameter(param, BLOCK_OPT_SIZE, buf); |
397 |
} else {
|
398 |
error("Image creation needs a size parameter");
|
399 |
ret = -1;
|
400 |
goto out;
|
401 |
} |
402 |
} |
403 |
|
404 |
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
405 |
print_option_parameters(param); |
406 |
puts("");
|
407 |
|
408 |
ret = bdrv_create(drv, filename, param); |
409 |
free_option_parameters(create_options); |
410 |
free_option_parameters(param); |
411 |
|
412 |
if (ret < 0) { |
413 |
if (ret == -ENOTSUP) {
|
414 |
error("Formatting or formatting option not supported for file format '%s'", fmt);
|
415 |
} else if (ret == -EFBIG) { |
416 |
error("The image size is too large for file format '%s'", fmt);
|
417 |
} else {
|
418 |
error("%s: error while creating %s: %s", filename, fmt, strerror(-ret));
|
419 |
} |
420 |
} |
421 |
out:
|
422 |
if (ret) {
|
423 |
return 1; |
424 |
} |
425 |
return 0; |
426 |
} |
427 |
|
428 |
/*
|
429 |
* Checks an image for consistency. Exit codes:
|
430 |
*
|
431 |
* 0 - Check completed, image is good
|
432 |
* 1 - Check not completed because of internal errors
|
433 |
* 2 - Check completed, image is corrupted
|
434 |
* 3 - Check completed, image has leaked clusters, but is good otherwise
|
435 |
*/
|
436 |
static int img_check(int argc, char **argv) |
437 |
{ |
438 |
int c, ret;
|
439 |
const char *filename, *fmt; |
440 |
BlockDriverState *bs; |
441 |
BdrvCheckResult result; |
442 |
|
443 |
fmt = NULL;
|
444 |
for(;;) {
|
445 |
c = getopt(argc, argv, "f:h");
|
446 |
if (c == -1) |
447 |
break;
|
448 |
switch(c) {
|
449 |
case 'h': |
450 |
help(); |
451 |
break;
|
452 |
case 'f': |
453 |
fmt = optarg; |
454 |
break;
|
455 |
} |
456 |
} |
457 |
if (optind >= argc)
|
458 |
help(); |
459 |
filename = argv[optind++]; |
460 |
|
461 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); |
462 |
if (!bs) {
|
463 |
return 1; |
464 |
} |
465 |
ret = bdrv_check(bs, &result); |
466 |
|
467 |
if (ret == -ENOTSUP) {
|
468 |
error("This image format does not support checks");
|
469 |
bdrv_delete(bs); |
470 |
return 1; |
471 |
} |
472 |
|
473 |
if (!(result.corruptions || result.leaks || result.check_errors)) {
|
474 |
printf("No errors were found on the image.\n");
|
475 |
} else {
|
476 |
if (result.corruptions) {
|
477 |
printf("\n%d errors were found on the image.\n"
|
478 |
"Data may be corrupted, or further writes to the image "
|
479 |
"may corrupt it.\n",
|
480 |
result.corruptions); |
481 |
} |
482 |
|
483 |
if (result.leaks) {
|
484 |
printf("\n%d leaked clusters were found on the image.\n"
|
485 |
"This means waste of disk space, but no harm to data.\n",
|
486 |
result.leaks); |
487 |
} |
488 |
|
489 |
if (result.check_errors) {
|
490 |
printf("\n%d internal errors have occurred during the check.\n",
|
491 |
result.check_errors); |
492 |
} |
493 |
} |
494 |
|
495 |
bdrv_delete(bs); |
496 |
|
497 |
if (ret < 0 || result.check_errors) { |
498 |
printf("\nAn error has occurred during the check: %s\n"
|
499 |
"The check is not complete and may have missed error.\n",
|
500 |
strerror(-ret)); |
501 |
return 1; |
502 |
} |
503 |
|
504 |
if (result.corruptions) {
|
505 |
return 2; |
506 |
} else if (result.leaks) { |
507 |
return 3; |
508 |
} else {
|
509 |
return 0; |
510 |
} |
511 |
} |
512 |
|
513 |
static int img_commit(int argc, char **argv) |
514 |
{ |
515 |
int c, ret;
|
516 |
const char *filename, *fmt; |
517 |
BlockDriverState *bs; |
518 |
|
519 |
fmt = NULL;
|
520 |
for(;;) {
|
521 |
c = getopt(argc, argv, "f:h");
|
522 |
if (c == -1) |
523 |
break;
|
524 |
switch(c) {
|
525 |
case 'h': |
526 |
help(); |
527 |
break;
|
528 |
case 'f': |
529 |
fmt = optarg; |
530 |
break;
|
531 |
} |
532 |
} |
533 |
if (optind >= argc)
|
534 |
help(); |
535 |
filename = argv[optind++]; |
536 |
|
537 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
538 |
if (!bs) {
|
539 |
return 1; |
540 |
} |
541 |
ret = bdrv_commit(bs); |
542 |
switch(ret) {
|
543 |
case 0: |
544 |
printf("Image committed.\n");
|
545 |
break;
|
546 |
case -ENOENT:
|
547 |
error("No disk inserted");
|
548 |
break;
|
549 |
case -EACCES:
|
550 |
error("Image is read-only");
|
551 |
break;
|
552 |
case -ENOTSUP:
|
553 |
error("Image is already committed");
|
554 |
break;
|
555 |
default:
|
556 |
error("Error while committing image");
|
557 |
break;
|
558 |
} |
559 |
|
560 |
bdrv_delete(bs); |
561 |
if (ret) {
|
562 |
return 1; |
563 |
} |
564 |
return 0; |
565 |
} |
566 |
|
567 |
static int is_not_zero(const uint8_t *sector, int len) |
568 |
{ |
569 |
int i;
|
570 |
len >>= 2;
|
571 |
for(i = 0;i < len; i++) { |
572 |
if (((uint32_t *)sector)[i] != 0) |
573 |
return 1; |
574 |
} |
575 |
return 0; |
576 |
} |
577 |
|
578 |
/*
|
579 |
* Returns true iff the first sector pointed to by 'buf' contains at least
|
580 |
* a non-NUL byte.
|
581 |
*
|
582 |
* 'pnum' is set to the number of sectors (including and immediately following
|
583 |
* the first one) that are known to be in the same allocated/unallocated state.
|
584 |
*/
|
585 |
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
586 |
{ |
587 |
int v, i;
|
588 |
|
589 |
if (n <= 0) { |
590 |
*pnum = 0;
|
591 |
return 0; |
592 |
} |
593 |
v = is_not_zero(buf, 512);
|
594 |
for(i = 1; i < n; i++) { |
595 |
buf += 512;
|
596 |
if (v != is_not_zero(buf, 512)) |
597 |
break;
|
598 |
} |
599 |
*pnum = i; |
600 |
return v;
|
601 |
} |
602 |
|
603 |
/*
|
604 |
* Compares two buffers sector by sector. Returns 0 if the first sector of both
|
605 |
* buffers matches, non-zero otherwise.
|
606 |
*
|
607 |
* pnum is set to the number of sectors (including and immediately following
|
608 |
* the first one) that are known to have the same comparison result
|
609 |
*/
|
610 |
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, |
611 |
int *pnum)
|
612 |
{ |
613 |
int res, i;
|
614 |
|
615 |
if (n <= 0) { |
616 |
*pnum = 0;
|
617 |
return 0; |
618 |
} |
619 |
|
620 |
res = !!memcmp(buf1, buf2, 512);
|
621 |
for(i = 1; i < n; i++) { |
622 |
buf1 += 512;
|
623 |
buf2 += 512;
|
624 |
|
625 |
if (!!memcmp(buf1, buf2, 512) != res) { |
626 |
break;
|
627 |
} |
628 |
} |
629 |
|
630 |
*pnum = i; |
631 |
return res;
|
632 |
} |
633 |
|
634 |
#define IO_BUF_SIZE (2 * 1024 * 1024) |
635 |
|
636 |
static int img_convert(int argc, char **argv) |
637 |
{ |
638 |
int c, ret = 0, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors; |
639 |
const char *fmt, *out_fmt, *out_baseimg, *out_filename; |
640 |
BlockDriver *drv, *proto_drv; |
641 |
BlockDriverState **bs = NULL, *out_bs = NULL; |
642 |
int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
643 |
uint64_t bs_sectors; |
644 |
uint8_t * buf = NULL;
|
645 |
const uint8_t *buf1;
|
646 |
BlockDriverInfo bdi; |
647 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
648 |
char *options = NULL; |
649 |
|
650 |
fmt = NULL;
|
651 |
out_fmt = "raw";
|
652 |
out_baseimg = NULL;
|
653 |
flags = 0;
|
654 |
for(;;) {
|
655 |
c = getopt(argc, argv, "f:O:B:hce6o:");
|
656 |
if (c == -1) |
657 |
break;
|
658 |
switch(c) {
|
659 |
case 'h': |
660 |
help(); |
661 |
break;
|
662 |
case 'f': |
663 |
fmt = optarg; |
664 |
break;
|
665 |
case 'O': |
666 |
out_fmt = optarg; |
667 |
break;
|
668 |
case 'B': |
669 |
out_baseimg = optarg; |
670 |
break;
|
671 |
case 'c': |
672 |
flags |= BLOCK_FLAG_COMPRESS; |
673 |
break;
|
674 |
case 'e': |
675 |
flags |= BLOCK_FLAG_ENCRYPT; |
676 |
break;
|
677 |
case '6': |
678 |
flags |= BLOCK_FLAG_COMPAT6; |
679 |
break;
|
680 |
case 'o': |
681 |
options = optarg; |
682 |
break;
|
683 |
} |
684 |
} |
685 |
|
686 |
bs_n = argc - optind - 1;
|
687 |
if (bs_n < 1) help(); |
688 |
|
689 |
out_filename = argv[argc - 1];
|
690 |
|
691 |
if (bs_n > 1 && out_baseimg) { |
692 |
error("-B makes no sense when concatenating multiple input images");
|
693 |
return 1; |
694 |
} |
695 |
|
696 |
bs = calloc(bs_n, sizeof(BlockDriverState *));
|
697 |
if (!bs) {
|
698 |
error("Out of memory");
|
699 |
return 1; |
700 |
} |
701 |
|
702 |
total_sectors = 0;
|
703 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
704 |
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); |
705 |
if (!bs[bs_i]) {
|
706 |
error("Could not open '%s'", argv[optind + bs_i]);
|
707 |
ret = -1;
|
708 |
goto out;
|
709 |
} |
710 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
711 |
total_sectors += bs_sectors; |
712 |
} |
713 |
|
714 |
/* Find driver and parse its options */
|
715 |
drv = bdrv_find_format(out_fmt); |
716 |
if (!drv) {
|
717 |
error("Unknown file format '%s'", out_fmt);
|
718 |
ret = -1;
|
719 |
goto out;
|
720 |
} |
721 |
|
722 |
proto_drv = bdrv_find_protocol(out_filename); |
723 |
if (!proto_drv) {
|
724 |
error("Unknown protocol '%s'", out_filename);
|
725 |
ret = -1;
|
726 |
goto out;
|
727 |
} |
728 |
|
729 |
create_options = append_option_parameters(create_options, |
730 |
drv->create_options); |
731 |
create_options = append_option_parameters(create_options, |
732 |
proto_drv->create_options); |
733 |
if (options && !strcmp(options, "?")) { |
734 |
print_option_help(create_options); |
735 |
goto out;
|
736 |
} |
737 |
|
738 |
if (options) {
|
739 |
param = parse_option_parameters(options, create_options, param); |
740 |
if (param == NULL) { |
741 |
error("Invalid options for file format '%s'.", out_fmt);
|
742 |
ret = -1;
|
743 |
goto out;
|
744 |
} |
745 |
} else {
|
746 |
param = parse_option_parameters("", create_options, param);
|
747 |
} |
748 |
|
749 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
|
750 |
ret = add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
|
751 |
if (ret < 0) { |
752 |
goto out;
|
753 |
} |
754 |
|
755 |
/* Check if compression is supported */
|
756 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
757 |
QEMUOptionParameter *encryption = |
758 |
get_option_parameter(param, BLOCK_OPT_ENCRYPT); |
759 |
|
760 |
if (!drv->bdrv_write_compressed) {
|
761 |
error("Compression not supported for this file format");
|
762 |
ret = -1;
|
763 |
goto out;
|
764 |
} |
765 |
|
766 |
if (encryption && encryption->value.n) {
|
767 |
error("Compression and encryption not supported at the same time");
|
768 |
ret = -1;
|
769 |
goto out;
|
770 |
} |
771 |
} |
772 |
|
773 |
/* Create the new image */
|
774 |
ret = bdrv_create(drv, out_filename, param); |
775 |
if (ret < 0) { |
776 |
if (ret == -ENOTSUP) {
|
777 |
error("Formatting not supported for file format '%s'", out_fmt);
|
778 |
} else if (ret == -EFBIG) { |
779 |
error("The image size is too large for file format '%s'", out_fmt);
|
780 |
} else {
|
781 |
error("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret));
|
782 |
} |
783 |
goto out;
|
784 |
} |
785 |
|
786 |
out_bs = bdrv_new_open(out_filename, out_fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
787 |
if (!out_bs) {
|
788 |
ret = -1;
|
789 |
goto out;
|
790 |
} |
791 |
|
792 |
bs_i = 0;
|
793 |
bs_offset = 0;
|
794 |
bdrv_get_geometry(bs[0], &bs_sectors);
|
795 |
buf = qemu_malloc(IO_BUF_SIZE); |
796 |
|
797 |
if (flags & BLOCK_FLAG_COMPRESS) {
|
798 |
ret = bdrv_get_info(out_bs, &bdi); |
799 |
if (ret < 0) { |
800 |
error("could not get block driver info");
|
801 |
goto out;
|
802 |
} |
803 |
cluster_size = bdi.cluster_size; |
804 |
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { |
805 |
error("invalid cluster size");
|
806 |
ret = -1;
|
807 |
goto out;
|
808 |
} |
809 |
cluster_sectors = cluster_size >> 9;
|
810 |
sector_num = 0;
|
811 |
for(;;) {
|
812 |
int64_t bs_num; |
813 |
int remainder;
|
814 |
uint8_t *buf2; |
815 |
|
816 |
nb_sectors = total_sectors - sector_num; |
817 |
if (nb_sectors <= 0) |
818 |
break;
|
819 |
if (nb_sectors >= cluster_sectors)
|
820 |
n = cluster_sectors; |
821 |
else
|
822 |
n = nb_sectors; |
823 |
|
824 |
bs_num = sector_num - bs_offset; |
825 |
assert (bs_num >= 0);
|
826 |
remainder = n; |
827 |
buf2 = buf; |
828 |
while (remainder > 0) { |
829 |
int nlow;
|
830 |
while (bs_num == bs_sectors) {
|
831 |
bs_i++; |
832 |
assert (bs_i < bs_n); |
833 |
bs_offset += bs_sectors; |
834 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
835 |
bs_num = 0;
|
836 |
/* printf("changing part: sector_num=%" PRId64 ", "
|
837 |
"bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64
|
838 |
"\n", sector_num, bs_i, bs_offset, bs_sectors); */
|
839 |
} |
840 |
assert (bs_num < bs_sectors); |
841 |
|
842 |
nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; |
843 |
|
844 |
ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); |
845 |
if (ret < 0) { |
846 |
error("error while reading");
|
847 |
goto out;
|
848 |
} |
849 |
|
850 |
buf2 += nlow * 512;
|
851 |
bs_num += nlow; |
852 |
|
853 |
remainder -= nlow; |
854 |
} |
855 |
assert (remainder == 0);
|
856 |
|
857 |
if (n < cluster_sectors)
|
858 |
memset(buf + n * 512, 0, cluster_size - n * 512); |
859 |
if (is_not_zero(buf, cluster_size)) {
|
860 |
ret = bdrv_write_compressed(out_bs, sector_num, buf, |
861 |
cluster_sectors); |
862 |
if (ret != 0) { |
863 |
error("error while compressing sector %" PRId64,
|
864 |
sector_num); |
865 |
goto out;
|
866 |
} |
867 |
} |
868 |
sector_num += n; |
869 |
} |
870 |
/* signal EOF to align */
|
871 |
bdrv_write_compressed(out_bs, 0, NULL, 0); |
872 |
} else {
|
873 |
int has_zero_init = bdrv_has_zero_init(out_bs);
|
874 |
|
875 |
sector_num = 0; // total number of sectors converted so far |
876 |
for(;;) {
|
877 |
nb_sectors = total_sectors - sector_num; |
878 |
if (nb_sectors <= 0) |
879 |
break;
|
880 |
if (nb_sectors >= (IO_BUF_SIZE / 512)) |
881 |
n = (IO_BUF_SIZE / 512);
|
882 |
else
|
883 |
n = nb_sectors; |
884 |
|
885 |
while (sector_num - bs_offset >= bs_sectors) {
|
886 |
bs_i ++; |
887 |
assert (bs_i < bs_n); |
888 |
bs_offset += bs_sectors; |
889 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
890 |
/* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, "
|
891 |
"bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n",
|
892 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
893 |
} |
894 |
|
895 |
if (n > bs_offset + bs_sectors - sector_num)
|
896 |
n = bs_offset + bs_sectors - sector_num; |
897 |
|
898 |
if (has_zero_init) {
|
899 |
/* If the output image is being created as a copy on write image,
|
900 |
assume that sectors which are unallocated in the input image
|
901 |
are present in both the output's and input's base images (no
|
902 |
need to copy them). */
|
903 |
if (out_baseimg) {
|
904 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
|
905 |
n, &n1)) { |
906 |
sector_num += n1; |
907 |
continue;
|
908 |
} |
909 |
/* The next 'n1' sectors are allocated in the input image. Copy
|
910 |
only those as they may be followed by unallocated sectors. */
|
911 |
n = n1; |
912 |
} |
913 |
} else {
|
914 |
n1 = n; |
915 |
} |
916 |
|
917 |
ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); |
918 |
if (ret < 0) { |
919 |
error("error while reading");
|
920 |
goto out;
|
921 |
} |
922 |
/* NOTE: at the same time we convert, we do not write zero
|
923 |
sectors to have a chance to compress the image. Ideally, we
|
924 |
should add a specific call to have the info to go faster */
|
925 |
buf1 = buf; |
926 |
while (n > 0) { |
927 |
/* If the output image is being created as a copy on write image,
|
928 |
copy all sectors even the ones containing only NUL bytes,
|
929 |
because they may differ from the sectors in the base image.
|
930 |
|
931 |
If the output is to a host device, we also write out
|
932 |
sectors that are entirely 0, since whatever data was
|
933 |
already there is garbage, not 0s. */
|
934 |
if (!has_zero_init || out_baseimg ||
|
935 |
is_allocated_sectors(buf1, n, &n1)) { |
936 |
ret = bdrv_write(out_bs, sector_num, buf1, n1); |
937 |
if (ret < 0) { |
938 |
error("error while writing");
|
939 |
goto out;
|
940 |
} |
941 |
} |
942 |
sector_num += n1; |
943 |
n -= n1; |
944 |
buf1 += n1 * 512;
|
945 |
} |
946 |
} |
947 |
} |
948 |
out:
|
949 |
free_option_parameters(create_options); |
950 |
free_option_parameters(param); |
951 |
qemu_free(buf); |
952 |
if (out_bs) {
|
953 |
bdrv_delete(out_bs); |
954 |
} |
955 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
956 |
if (bs[bs_i]) {
|
957 |
bdrv_delete(bs[bs_i]); |
958 |
} |
959 |
} |
960 |
free(bs); |
961 |
if (ret) {
|
962 |
return 1; |
963 |
} |
964 |
return 0; |
965 |
} |
966 |
|
967 |
#ifdef _WIN32
|
968 |
static int64_t get_allocated_file_size(const char *filename) |
969 |
{ |
970 |
typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
971 |
get_compressed_t get_compressed; |
972 |
struct _stati64 st;
|
973 |
|
974 |
/* WinNT support GetCompressedFileSize to determine allocate size */
|
975 |
get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); |
976 |
if (get_compressed) {
|
977 |
DWORD high, low; |
978 |
low = get_compressed(filename, &high); |
979 |
if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) |
980 |
return (((int64_t) high) << 32) + low; |
981 |
} |
982 |
|
983 |
if (_stati64(filename, &st) < 0) |
984 |
return -1; |
985 |
return st.st_size;
|
986 |
} |
987 |
#else
|
988 |
static int64_t get_allocated_file_size(const char *filename) |
989 |
{ |
990 |
struct stat st;
|
991 |
if (stat(filename, &st) < 0) |
992 |
return -1; |
993 |
return (int64_t)st.st_blocks * 512; |
994 |
} |
995 |
#endif
|
996 |
|
997 |
static void dump_snapshots(BlockDriverState *bs) |
998 |
{ |
999 |
QEMUSnapshotInfo *sn_tab, *sn; |
1000 |
int nb_sns, i;
|
1001 |
char buf[256]; |
1002 |
|
1003 |
nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
1004 |
if (nb_sns <= 0) |
1005 |
return;
|
1006 |
printf("Snapshot list:\n");
|
1007 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); |
1008 |
for(i = 0; i < nb_sns; i++) { |
1009 |
sn = &sn_tab[i]; |
1010 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); |
1011 |
} |
1012 |
qemu_free(sn_tab); |
1013 |
} |
1014 |
|
1015 |
static int img_info(int argc, char **argv) |
1016 |
{ |
1017 |
int c;
|
1018 |
const char *filename, *fmt; |
1019 |
BlockDriverState *bs; |
1020 |
char fmt_name[128], size_buf[128], dsize_buf[128]; |
1021 |
uint64_t total_sectors; |
1022 |
int64_t allocated_size; |
1023 |
char backing_filename[1024]; |
1024 |
char backing_filename2[1024]; |
1025 |
BlockDriverInfo bdi; |
1026 |
|
1027 |
fmt = NULL;
|
1028 |
for(;;) {
|
1029 |
c = getopt(argc, argv, "f:h");
|
1030 |
if (c == -1) |
1031 |
break;
|
1032 |
switch(c) {
|
1033 |
case 'h': |
1034 |
help(); |
1035 |
break;
|
1036 |
case 'f': |
1037 |
fmt = optarg; |
1038 |
break;
|
1039 |
} |
1040 |
} |
1041 |
if (optind >= argc)
|
1042 |
help(); |
1043 |
filename = argv[optind++]; |
1044 |
|
1045 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); |
1046 |
if (!bs) {
|
1047 |
return 1; |
1048 |
} |
1049 |
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
|
1050 |
bdrv_get_geometry(bs, &total_sectors); |
1051 |
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); |
1052 |
allocated_size = get_allocated_file_size(filename); |
1053 |
if (allocated_size < 0) |
1054 |
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
1055 |
else
|
1056 |
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
|
1057 |
allocated_size); |
1058 |
printf("image: %s\n"
|
1059 |
"file format: %s\n"
|
1060 |
"virtual size: %s (%" PRId64 " bytes)\n" |
1061 |
"disk size: %s\n",
|
1062 |
filename, fmt_name, size_buf, |
1063 |
(total_sectors * 512),
|
1064 |
dsize_buf); |
1065 |
if (bdrv_is_encrypted(bs))
|
1066 |
printf("encrypted: yes\n");
|
1067 |
if (bdrv_get_info(bs, &bdi) >= 0) { |
1068 |
if (bdi.cluster_size != 0) |
1069 |
printf("cluster_size: %d\n", bdi.cluster_size);
|
1070 |
} |
1071 |
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
|
1072 |
if (backing_filename[0] != '\0') { |
1073 |
path_combine(backing_filename2, sizeof(backing_filename2),
|
1074 |
filename, backing_filename); |
1075 |
printf("backing file: %s (actual path: %s)\n",
|
1076 |
backing_filename, |
1077 |
backing_filename2); |
1078 |
} |
1079 |
dump_snapshots(bs); |
1080 |
bdrv_delete(bs); |
1081 |
return 0; |
1082 |
} |
1083 |
|
1084 |
#define SNAPSHOT_LIST 1 |
1085 |
#define SNAPSHOT_CREATE 2 |
1086 |
#define SNAPSHOT_APPLY 3 |
1087 |
#define SNAPSHOT_DELETE 4 |
1088 |
|
1089 |
static int img_snapshot(int argc, char **argv) |
1090 |
{ |
1091 |
BlockDriverState *bs; |
1092 |
QEMUSnapshotInfo sn; |
1093 |
char *filename, *snapshot_name = NULL; |
1094 |
int c, ret = 0, bdrv_oflags; |
1095 |
int action = 0; |
1096 |
qemu_timeval tv; |
1097 |
|
1098 |
bdrv_oflags = BDRV_O_RDWR; |
1099 |
/* Parse commandline parameters */
|
1100 |
for(;;) {
|
1101 |
c = getopt(argc, argv, "la:c:d:h");
|
1102 |
if (c == -1) |
1103 |
break;
|
1104 |
switch(c) {
|
1105 |
case 'h': |
1106 |
help(); |
1107 |
return 0; |
1108 |
case 'l': |
1109 |
if (action) {
|
1110 |
help(); |
1111 |
return 0; |
1112 |
} |
1113 |
action = SNAPSHOT_LIST; |
1114 |
bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
|
1115 |
break;
|
1116 |
case 'a': |
1117 |
if (action) {
|
1118 |
help(); |
1119 |
return 0; |
1120 |
} |
1121 |
action = SNAPSHOT_APPLY; |
1122 |
snapshot_name = optarg; |
1123 |
break;
|
1124 |
case 'c': |
1125 |
if (action) {
|
1126 |
help(); |
1127 |
return 0; |
1128 |
} |
1129 |
action = SNAPSHOT_CREATE; |
1130 |
snapshot_name = optarg; |
1131 |
break;
|
1132 |
case 'd': |
1133 |
if (action) {
|
1134 |
help(); |
1135 |
return 0; |
1136 |
} |
1137 |
action = SNAPSHOT_DELETE; |
1138 |
snapshot_name = optarg; |
1139 |
break;
|
1140 |
} |
1141 |
} |
1142 |
|
1143 |
if (optind >= argc)
|
1144 |
help(); |
1145 |
filename = argv[optind++]; |
1146 |
|
1147 |
/* Open the image */
|
1148 |
bs = bdrv_new_open(filename, NULL, bdrv_oflags);
|
1149 |
if (!bs) {
|
1150 |
return 1; |
1151 |
} |
1152 |
|
1153 |
/* Perform the requested action */
|
1154 |
switch(action) {
|
1155 |
case SNAPSHOT_LIST:
|
1156 |
dump_snapshots(bs); |
1157 |
break;
|
1158 |
|
1159 |
case SNAPSHOT_CREATE:
|
1160 |
memset(&sn, 0, sizeof(sn)); |
1161 |
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
|
1162 |
|
1163 |
qemu_gettimeofday(&tv); |
1164 |
sn.date_sec = tv.tv_sec; |
1165 |
sn.date_nsec = tv.tv_usec * 1000;
|
1166 |
|
1167 |
ret = bdrv_snapshot_create(bs, &sn); |
1168 |
if (ret)
|
1169 |
error("Could not create snapshot '%s': %d (%s)",
|
1170 |
snapshot_name, ret, strerror(-ret)); |
1171 |
break;
|
1172 |
|
1173 |
case SNAPSHOT_APPLY:
|
1174 |
ret = bdrv_snapshot_goto(bs, snapshot_name); |
1175 |
if (ret)
|
1176 |
error("Could not apply snapshot '%s': %d (%s)",
|
1177 |
snapshot_name, ret, strerror(-ret)); |
1178 |
break;
|
1179 |
|
1180 |
case SNAPSHOT_DELETE:
|
1181 |
ret = bdrv_snapshot_delete(bs, snapshot_name); |
1182 |
if (ret)
|
1183 |
error("Could not delete snapshot '%s': %d (%s)",
|
1184 |
snapshot_name, ret, strerror(-ret)); |
1185 |
break;
|
1186 |
} |
1187 |
|
1188 |
/* Cleanup */
|
1189 |
bdrv_delete(bs); |
1190 |
if (ret) {
|
1191 |
return 1; |
1192 |
} |
1193 |
return 0; |
1194 |
} |
1195 |
|
1196 |
static int img_rebase(int argc, char **argv) |
1197 |
{ |
1198 |
BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; |
1199 |
BlockDriver *old_backing_drv, *new_backing_drv; |
1200 |
char *filename;
|
1201 |
const char *fmt, *out_basefmt, *out_baseimg; |
1202 |
int c, flags, ret;
|
1203 |
int unsafe = 0; |
1204 |
|
1205 |
/* Parse commandline parameters */
|
1206 |
fmt = NULL;
|
1207 |
out_baseimg = NULL;
|
1208 |
out_basefmt = NULL;
|
1209 |
|
1210 |
for(;;) {
|
1211 |
c = getopt(argc, argv, "uhf:F:b:");
|
1212 |
if (c == -1) |
1213 |
break;
|
1214 |
switch(c) {
|
1215 |
case 'h': |
1216 |
help(); |
1217 |
return 0; |
1218 |
case 'f': |
1219 |
fmt = optarg; |
1220 |
break;
|
1221 |
case 'F': |
1222 |
out_basefmt = optarg; |
1223 |
break;
|
1224 |
case 'b': |
1225 |
out_baseimg = optarg; |
1226 |
break;
|
1227 |
case 'u': |
1228 |
unsafe = 1;
|
1229 |
break;
|
1230 |
} |
1231 |
} |
1232 |
|
1233 |
if ((optind >= argc) || !out_baseimg)
|
1234 |
help(); |
1235 |
filename = argv[optind++]; |
1236 |
|
1237 |
/*
|
1238 |
* Open the images.
|
1239 |
*
|
1240 |
* Ignore the old backing file for unsafe rebase in case we want to correct
|
1241 |
* the reference to a renamed or moved backing file.
|
1242 |
*/
|
1243 |
flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
1244 |
bs = bdrv_new_open(filename, fmt, flags); |
1245 |
if (!bs) {
|
1246 |
return 1; |
1247 |
} |
1248 |
|
1249 |
/* Find the right drivers for the backing files */
|
1250 |
old_backing_drv = NULL;
|
1251 |
new_backing_drv = NULL;
|
1252 |
|
1253 |
if (!unsafe && bs->backing_format[0] != '\0') { |
1254 |
old_backing_drv = bdrv_find_format(bs->backing_format); |
1255 |
if (old_backing_drv == NULL) { |
1256 |
error("Invalid format name: '%s'", bs->backing_format);
|
1257 |
ret = -1;
|
1258 |
goto out;
|
1259 |
} |
1260 |
} |
1261 |
|
1262 |
if (out_basefmt != NULL) { |
1263 |
new_backing_drv = bdrv_find_format(out_basefmt); |
1264 |
if (new_backing_drv == NULL) { |
1265 |
error("Invalid format name: '%s'", out_basefmt);
|
1266 |
ret = -1;
|
1267 |
goto out;
|
1268 |
} |
1269 |
} |
1270 |
|
1271 |
/* For safe rebasing we need to compare old and new backing file */
|
1272 |
if (unsafe) {
|
1273 |
/* Make the compiler happy */
|
1274 |
bs_old_backing = NULL;
|
1275 |
bs_new_backing = NULL;
|
1276 |
} else {
|
1277 |
char backing_name[1024]; |
1278 |
|
1279 |
bs_old_backing = bdrv_new("old_backing");
|
1280 |
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
1281 |
ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, |
1282 |
old_backing_drv); |
1283 |
if (ret) {
|
1284 |
error("Could not open old backing file '%s'", backing_name);
|
1285 |
goto out;
|
1286 |
} |
1287 |
|
1288 |
bs_new_backing = bdrv_new("new_backing");
|
1289 |
ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS | BDRV_O_RDWR, |
1290 |
new_backing_drv); |
1291 |
if (ret) {
|
1292 |
error("Could not open new backing file '%s'", out_baseimg);
|
1293 |
goto out;
|
1294 |
} |
1295 |
} |
1296 |
|
1297 |
/*
|
1298 |
* Check each unallocated cluster in the COW file. If it is unallocated,
|
1299 |
* accesses go to the backing file. We must therefore compare this cluster
|
1300 |
* in the old and new backing file, and if they differ we need to copy it
|
1301 |
* from the old backing file into the COW file.
|
1302 |
*
|
1303 |
* If qemu-img crashes during this step, no harm is done. The content of
|
1304 |
* the image is the same as the original one at any time.
|
1305 |
*/
|
1306 |
if (!unsafe) {
|
1307 |
uint64_t num_sectors; |
1308 |
uint64_t sector; |
1309 |
int n;
|
1310 |
uint8_t * buf_old; |
1311 |
uint8_t * buf_new; |
1312 |
|
1313 |
buf_old = qemu_malloc(IO_BUF_SIZE); |
1314 |
buf_new = qemu_malloc(IO_BUF_SIZE); |
1315 |
|
1316 |
bdrv_get_geometry(bs, &num_sectors); |
1317 |
|
1318 |
for (sector = 0; sector < num_sectors; sector += n) { |
1319 |
|
1320 |
/* How many sectors can we handle with the next read? */
|
1321 |
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { |
1322 |
n = (IO_BUF_SIZE / 512);
|
1323 |
} else {
|
1324 |
n = num_sectors - sector; |
1325 |
} |
1326 |
|
1327 |
/* If the cluster is allocated, we don't need to take action */
|
1328 |
ret = bdrv_is_allocated(bs, sector, n, &n); |
1329 |
if (ret) {
|
1330 |
continue;
|
1331 |
} |
1332 |
|
1333 |
/* Read old and new backing file */
|
1334 |
ret = bdrv_read(bs_old_backing, sector, buf_old, n); |
1335 |
if (ret < 0) { |
1336 |
error("error while reading from old backing file");
|
1337 |
goto out;
|
1338 |
} |
1339 |
ret = bdrv_read(bs_new_backing, sector, buf_new, n); |
1340 |
if (ret < 0) { |
1341 |
error("error while reading from new backing file");
|
1342 |
goto out;
|
1343 |
} |
1344 |
|
1345 |
/* If they differ, we need to write to the COW file */
|
1346 |
uint64_t written = 0;
|
1347 |
|
1348 |
while (written < n) {
|
1349 |
int pnum;
|
1350 |
|
1351 |
if (compare_sectors(buf_old + written * 512, |
1352 |
buf_new + written * 512, n - written, &pnum))
|
1353 |
{ |
1354 |
ret = bdrv_write(bs, sector + written, |
1355 |
buf_old + written * 512, pnum);
|
1356 |
if (ret < 0) { |
1357 |
error("Error while writing to COW image: %s",
|
1358 |
strerror(-ret)); |
1359 |
goto out;
|
1360 |
} |
1361 |
} |
1362 |
|
1363 |
written += pnum; |
1364 |
} |
1365 |
} |
1366 |
|
1367 |
qemu_free(buf_old); |
1368 |
qemu_free(buf_new); |
1369 |
} |
1370 |
|
1371 |
/*
|
1372 |
* Change the backing file. All clusters that are different from the old
|
1373 |
* backing file are overwritten in the COW file now, so the visible content
|
1374 |
* doesn't change when we switch the backing file.
|
1375 |
*/
|
1376 |
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
1377 |
if (ret == -ENOSPC) {
|
1378 |
error("Could not change the backing file to '%s': No space left in "
|
1379 |
"the file header", out_baseimg);
|
1380 |
} else if (ret < 0) { |
1381 |
error("Could not change the backing file to '%s': %s",
|
1382 |
out_baseimg, strerror(-ret)); |
1383 |
} |
1384 |
|
1385 |
/*
|
1386 |
* TODO At this point it is possible to check if any clusters that are
|
1387 |
* allocated in the COW file are the same in the backing file. If so, they
|
1388 |
* could be dropped from the COW file. Don't do this before switching the
|
1389 |
* backing file, in case of a crash this would lead to corruption.
|
1390 |
*/
|
1391 |
out:
|
1392 |
/* Cleanup */
|
1393 |
if (!unsafe) {
|
1394 |
bdrv_delete(bs_old_backing); |
1395 |
bdrv_delete(bs_new_backing); |
1396 |
} |
1397 |
|
1398 |
bdrv_delete(bs); |
1399 |
if (ret) {
|
1400 |
return 1; |
1401 |
} |
1402 |
return 0; |
1403 |
} |
1404 |
|
1405 |
static int img_resize(int argc, char **argv) |
1406 |
{ |
1407 |
int c, ret, relative;
|
1408 |
const char *filename, *fmt, *size; |
1409 |
int64_t n, total_size; |
1410 |
BlockDriverState *bs; |
1411 |
QEMUOptionParameter *param; |
1412 |
QEMUOptionParameter resize_options[] = { |
1413 |
{ |
1414 |
.name = BLOCK_OPT_SIZE, |
1415 |
.type = OPT_SIZE, |
1416 |
.help = "Virtual disk size"
|
1417 |
}, |
1418 |
{ NULL }
|
1419 |
}; |
1420 |
|
1421 |
fmt = NULL;
|
1422 |
for(;;) {
|
1423 |
c = getopt(argc, argv, "f:h");
|
1424 |
if (c == -1) { |
1425 |
break;
|
1426 |
} |
1427 |
switch(c) {
|
1428 |
case 'h': |
1429 |
help(); |
1430 |
break;
|
1431 |
case 'f': |
1432 |
fmt = optarg; |
1433 |
break;
|
1434 |
} |
1435 |
} |
1436 |
if (optind + 1 >= argc) { |
1437 |
help(); |
1438 |
} |
1439 |
filename = argv[optind++]; |
1440 |
size = argv[optind++]; |
1441 |
|
1442 |
/* Choose grow, shrink, or absolute resize mode */
|
1443 |
switch (size[0]) { |
1444 |
case '+': |
1445 |
relative = 1;
|
1446 |
size++; |
1447 |
break;
|
1448 |
case '-': |
1449 |
relative = -1;
|
1450 |
size++; |
1451 |
break;
|
1452 |
default:
|
1453 |
relative = 0;
|
1454 |
break;
|
1455 |
} |
1456 |
|
1457 |
/* Parse size */
|
1458 |
param = parse_option_parameters("", resize_options, NULL); |
1459 |
if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) {
|
1460 |
/* Error message already printed when size parsing fails */
|
1461 |
exit(1);
|
1462 |
} |
1463 |
n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n; |
1464 |
free_option_parameters(param); |
1465 |
|
1466 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
1467 |
if (!bs) {
|
1468 |
return 1; |
1469 |
} |
1470 |
|
1471 |
if (relative) {
|
1472 |
total_size = bdrv_getlength(bs) + n * relative; |
1473 |
} else {
|
1474 |
total_size = n; |
1475 |
} |
1476 |
if (total_size <= 0) { |
1477 |
error("New image size must be positive");
|
1478 |
ret = -1;
|
1479 |
goto out;
|
1480 |
} |
1481 |
|
1482 |
ret = bdrv_truncate(bs, total_size); |
1483 |
switch (ret) {
|
1484 |
case 0: |
1485 |
printf("Image resized.\n");
|
1486 |
break;
|
1487 |
case -ENOTSUP:
|
1488 |
error("This image format does not support resize");
|
1489 |
break;
|
1490 |
case -EACCES:
|
1491 |
error("Image is read-only");
|
1492 |
break;
|
1493 |
default:
|
1494 |
error("Error resizing image (%d)", -ret);
|
1495 |
break;
|
1496 |
} |
1497 |
out:
|
1498 |
bdrv_delete(bs); |
1499 |
if (ret) {
|
1500 |
return 1; |
1501 |
} |
1502 |
return 0; |
1503 |
} |
1504 |
|
1505 |
static const img_cmd_t img_cmds[] = { |
1506 |
#define DEF(option, callback, arg_string) \
|
1507 |
{ option, callback }, |
1508 |
#include "qemu-img-cmds.h" |
1509 |
#undef DEF
|
1510 |
#undef GEN_DOCS
|
1511 |
{ NULL, NULL, }, |
1512 |
}; |
1513 |
|
1514 |
int main(int argc, char **argv) |
1515 |
{ |
1516 |
const img_cmd_t *cmd;
|
1517 |
const char *cmdname; |
1518 |
|
1519 |
bdrv_init(); |
1520 |
if (argc < 2) |
1521 |
help(); |
1522 |
cmdname = argv[1];
|
1523 |
argc--; argv++; |
1524 |
|
1525 |
/* find the command */
|
1526 |
for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
1527 |
if (!strcmp(cmdname, cmd->name)) {
|
1528 |
return cmd->handler(argc, argv);
|
1529 |
} |
1530 |
} |
1531 |
|
1532 |
/* not found */
|
1533 |
help(); |
1534 |
return 0; |
1535 |
} |