root / qemu-img.c @ 20caf0f7
History | View | Annotate | Download (48.1 kB)
1 |
/*
|
---|---|
2 |
* QEMU disk image utility
|
3 |
*
|
4 |
* Copyright (c) 2003-2008 Fabrice Bellard
|
5 |
*
|
6 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
7 |
* of this software and associated documentation files (the "Software"), to deal
|
8 |
* in the Software without restriction, including without limitation the rights
|
9 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
10 |
* copies of the Software, and to permit persons to whom the Software is
|
11 |
* furnished to do so, subject to the following conditions:
|
12 |
*
|
13 |
* The above copyright notice and this permission notice shall be included in
|
14 |
* all copies or substantial portions of the Software.
|
15 |
*
|
16 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
17 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
18 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
19 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
20 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
21 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
22 |
* THE SOFTWARE.
|
23 |
*/
|
24 |
#include "qemu-common.h" |
25 |
#include "qemu-option.h" |
26 |
#include "qemu-error.h" |
27 |
#include "osdep.h" |
28 |
#include "sysemu.h" |
29 |
#include "block_int.h" |
30 |
#include <stdio.h> |
31 |
|
32 |
#ifdef _WIN32
|
33 |
#include <windows.h> |
34 |
#endif
|
35 |
|
36 |
typedef struct img_cmd_t { |
37 |
const char *name; |
38 |
int (*handler)(int argc, char **argv); |
39 |
} img_cmd_t; |
40 |
|
41 |
/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
|
42 |
#define BDRV_O_FLAGS BDRV_O_CACHE_WB
|
43 |
#define BDRV_DEFAULT_CACHE "writeback" |
44 |
|
45 |
static void format_print(void *opaque, const char *name) |
46 |
{ |
47 |
printf(" %s", name);
|
48 |
} |
49 |
|
50 |
/* Please keep in synch with qemu-img.texi */
|
51 |
static void help(void) |
52 |
{ |
53 |
const char *help_msg = |
54 |
"qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n" |
55 |
"usage: qemu-img command [command options]\n"
|
56 |
"QEMU disk image utility\n"
|
57 |
"\n"
|
58 |
"Command syntax:\n"
|
59 |
#define DEF(option, callback, arg_string) \
|
60 |
" " arg_string "\n" |
61 |
#include "qemu-img-cmds.h" |
62 |
#undef DEF
|
63 |
#undef GEN_DOCS
|
64 |
"\n"
|
65 |
"Command parameters:\n"
|
66 |
" 'filename' is a disk image filename\n"
|
67 |
" 'fmt' is the disk image format. It is guessed automatically in most cases\n"
|
68 |
" 'cache' is the cache mode used to write the output disk image, the valid\n"
|
69 |
" options are: 'none', 'writeback' (default, except for convert), 'writethrough',\n"
|
70 |
" 'directsync' and 'unsafe' (default for convert)\n"
|
71 |
" 'size' is the disk image size in bytes. Optional suffixes\n"
|
72 |
" 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n"
|
73 |
" and T (terabyte, 1024G) are supported. 'b' is ignored.\n"
|
74 |
" 'output_filename' is the destination disk image filename\n"
|
75 |
" 'output_fmt' is the destination format\n"
|
76 |
" 'options' is a comma separated list of format specific options in a\n"
|
77 |
" name=value format. Use -o ? for an overview of the options supported by the\n"
|
78 |
" used format\n"
|
79 |
" '-c' indicates that target image must be compressed (qcow format only)\n"
|
80 |
" '-u' enables unsafe rebasing. It is assumed that old and new backing file\n"
|
81 |
" match exactly. The image doesn't need a working backing file before\n"
|
82 |
" rebasing in this case (useful for renaming the backing file)\n"
|
83 |
" '-h' with or without a command shows this help and lists the supported formats\n"
|
84 |
" '-p' show progress of command (only certain commands)\n"
|
85 |
" '-S' indicates the consecutive number of bytes that must contain only zeros\n"
|
86 |
" for qemu-img to create a sparse image during conversion\n"
|
87 |
"\n"
|
88 |
"Parameters to check subcommand:\n"
|
89 |
" '-r' tries to repair any inconsistencies that are found during the check.\n"
|
90 |
" '-r leaks' repairs only cluster leaks, whereas '-r all' fixes all\n"
|
91 |
" kinds of errors, with a higher risk of choosing the wrong fix or\n"
|
92 |
" hiding corruption that has already occured.\n"
|
93 |
"\n"
|
94 |
"Parameters to snapshot subcommand:\n"
|
95 |
" 'snapshot' is the name of the snapshot to create, apply or delete\n"
|
96 |
" '-a' applies a snapshot (revert disk to saved state)\n"
|
97 |
" '-c' creates a snapshot\n"
|
98 |
" '-d' deletes a snapshot\n"
|
99 |
" '-l' lists all snapshots in the given image\n";
|
100 |
|
101 |
printf("%s\nSupported formats:", help_msg);
|
102 |
bdrv_iterate_format(format_print, NULL);
|
103 |
printf("\n");
|
104 |
exit(1);
|
105 |
} |
106 |
|
107 |
#if defined(WIN32)
|
108 |
/* XXX: put correct support for win32 */
|
109 |
static int read_password(char *buf, int buf_size) |
110 |
{ |
111 |
int c, i;
|
112 |
printf("Password: ");
|
113 |
fflush(stdout); |
114 |
i = 0;
|
115 |
for(;;) {
|
116 |
c = getchar(); |
117 |
if (c == '\n') |
118 |
break;
|
119 |
if (i < (buf_size - 1)) |
120 |
buf[i++] = c; |
121 |
} |
122 |
buf[i] = '\0';
|
123 |
return 0; |
124 |
} |
125 |
|
126 |
#else
|
127 |
|
128 |
#include <termios.h> |
129 |
|
130 |
static struct termios oldtty; |
131 |
|
132 |
static void term_exit(void) |
133 |
{ |
134 |
tcsetattr (0, TCSANOW, &oldtty);
|
135 |
} |
136 |
|
137 |
static void term_init(void) |
138 |
{ |
139 |
struct termios tty;
|
140 |
|
141 |
tcgetattr (0, &tty);
|
142 |
oldtty = tty; |
143 |
|
144 |
tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP |
145 |
|INLCR|IGNCR|ICRNL|IXON); |
146 |
tty.c_oflag |= OPOST; |
147 |
tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); |
148 |
tty.c_cflag &= ~(CSIZE|PARENB); |
149 |
tty.c_cflag |= CS8; |
150 |
tty.c_cc[VMIN] = 1;
|
151 |
tty.c_cc[VTIME] = 0;
|
152 |
|
153 |
tcsetattr (0, TCSANOW, &tty);
|
154 |
|
155 |
atexit(term_exit); |
156 |
} |
157 |
|
158 |
static int read_password(char *buf, int buf_size) |
159 |
{ |
160 |
uint8_t ch; |
161 |
int i, ret;
|
162 |
|
163 |
printf("password: ");
|
164 |
fflush(stdout); |
165 |
term_init(); |
166 |
i = 0;
|
167 |
for(;;) {
|
168 |
ret = read(0, &ch, 1); |
169 |
if (ret == -1) { |
170 |
if (errno == EAGAIN || errno == EINTR) {
|
171 |
continue;
|
172 |
} else {
|
173 |
ret = -1;
|
174 |
break;
|
175 |
} |
176 |
} else if (ret == 0) { |
177 |
ret = -1;
|
178 |
break;
|
179 |
} else {
|
180 |
if (ch == '\r') { |
181 |
ret = 0;
|
182 |
break;
|
183 |
} |
184 |
if (i < (buf_size - 1)) |
185 |
buf[i++] = ch; |
186 |
} |
187 |
} |
188 |
term_exit(); |
189 |
buf[i] = '\0';
|
190 |
printf("\n");
|
191 |
return ret;
|
192 |
} |
193 |
#endif
|
194 |
|
195 |
static int print_block_option_help(const char *filename, const char *fmt) |
196 |
{ |
197 |
BlockDriver *drv, *proto_drv; |
198 |
QEMUOptionParameter *create_options = NULL;
|
199 |
|
200 |
/* Find driver and parse its options */
|
201 |
drv = bdrv_find_format(fmt); |
202 |
if (!drv) {
|
203 |
error_report("Unknown file format '%s'", fmt);
|
204 |
return 1; |
205 |
} |
206 |
|
207 |
proto_drv = bdrv_find_protocol(filename); |
208 |
if (!proto_drv) {
|
209 |
error_report("Unknown protocol '%s'", filename);
|
210 |
return 1; |
211 |
} |
212 |
|
213 |
create_options = append_option_parameters(create_options, |
214 |
drv->create_options); |
215 |
create_options = append_option_parameters(create_options, |
216 |
proto_drv->create_options); |
217 |
print_option_help(create_options); |
218 |
free_option_parameters(create_options); |
219 |
return 0; |
220 |
} |
221 |
|
222 |
static BlockDriverState *bdrv_new_open(const char *filename, |
223 |
const char *fmt, |
224 |
int flags)
|
225 |
{ |
226 |
BlockDriverState *bs; |
227 |
BlockDriver *drv; |
228 |
char password[256]; |
229 |
int ret;
|
230 |
|
231 |
bs = bdrv_new("image");
|
232 |
|
233 |
if (fmt) {
|
234 |
drv = bdrv_find_format(fmt); |
235 |
if (!drv) {
|
236 |
error_report("Unknown file format '%s'", fmt);
|
237 |
goto fail;
|
238 |
} |
239 |
} else {
|
240 |
drv = NULL;
|
241 |
} |
242 |
|
243 |
ret = bdrv_open(bs, filename, flags, drv); |
244 |
if (ret < 0) { |
245 |
error_report("Could not open '%s': %s", filename, strerror(-ret));
|
246 |
goto fail;
|
247 |
} |
248 |
|
249 |
if (bdrv_is_encrypted(bs)) {
|
250 |
printf("Disk image '%s' is encrypted.\n", filename);
|
251 |
if (read_password(password, sizeof(password)) < 0) { |
252 |
error_report("No password given");
|
253 |
goto fail;
|
254 |
} |
255 |
if (bdrv_set_key(bs, password) < 0) { |
256 |
error_report("invalid password");
|
257 |
goto fail;
|
258 |
} |
259 |
} |
260 |
return bs;
|
261 |
fail:
|
262 |
if (bs) {
|
263 |
bdrv_delete(bs); |
264 |
} |
265 |
return NULL; |
266 |
} |
267 |
|
268 |
static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
269 |
const char *base_filename, |
270 |
const char *base_fmt) |
271 |
{ |
272 |
if (base_filename) {
|
273 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
|
274 |
error_report("Backing file not supported for file format '%s'",
|
275 |
fmt); |
276 |
return -1; |
277 |
} |
278 |
} |
279 |
if (base_fmt) {
|
280 |
if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
281 |
error_report("Backing file format not supported for file "
|
282 |
"format '%s'", fmt);
|
283 |
return -1; |
284 |
} |
285 |
} |
286 |
return 0; |
287 |
} |
288 |
|
289 |
static int img_create(int argc, char **argv) |
290 |
{ |
291 |
int c, ret = 0; |
292 |
uint64_t img_size = -1;
|
293 |
const char *fmt = "raw"; |
294 |
const char *base_fmt = NULL; |
295 |
const char *filename; |
296 |
const char *base_filename = NULL; |
297 |
char *options = NULL; |
298 |
|
299 |
for(;;) {
|
300 |
c = getopt(argc, argv, "F:b:f:he6o:");
|
301 |
if (c == -1) { |
302 |
break;
|
303 |
} |
304 |
switch(c) {
|
305 |
case '?': |
306 |
case 'h': |
307 |
help(); |
308 |
break;
|
309 |
case 'F': |
310 |
base_fmt = optarg; |
311 |
break;
|
312 |
case 'b': |
313 |
base_filename = optarg; |
314 |
break;
|
315 |
case 'f': |
316 |
fmt = optarg; |
317 |
break;
|
318 |
case 'e': |
319 |
error_report("option -e is deprecated, please use \'-o "
|
320 |
"encryption\' instead!");
|
321 |
return 1; |
322 |
case '6': |
323 |
error_report("option -6 is deprecated, please use \'-o "
|
324 |
"compat6\' instead!");
|
325 |
return 1; |
326 |
case 'o': |
327 |
options = optarg; |
328 |
break;
|
329 |
} |
330 |
} |
331 |
|
332 |
/* Get the filename */
|
333 |
if (optind >= argc) {
|
334 |
help(); |
335 |
} |
336 |
filename = argv[optind++]; |
337 |
|
338 |
/* Get image size, if specified */
|
339 |
if (optind < argc) {
|
340 |
int64_t sval; |
341 |
char *end;
|
342 |
sval = strtosz_suffix(argv[optind++], &end, STRTOSZ_DEFSUFFIX_B); |
343 |
if (sval < 0 || *end) { |
344 |
error_report("Invalid image size specified! You may use k, M, G or "
|
345 |
"T suffixes for ");
|
346 |
error_report("kilobytes, megabytes, gigabytes and terabytes.");
|
347 |
ret = -1;
|
348 |
goto out;
|
349 |
} |
350 |
img_size = (uint64_t)sval; |
351 |
} |
352 |
|
353 |
if (options && is_help_option(options)) {
|
354 |
ret = print_block_option_help(filename, fmt); |
355 |
goto out;
|
356 |
} |
357 |
|
358 |
ret = bdrv_img_create(filename, fmt, base_filename, base_fmt, |
359 |
options, img_size, BDRV_O_FLAGS); |
360 |
out:
|
361 |
if (ret) {
|
362 |
return 1; |
363 |
} |
364 |
return 0; |
365 |
} |
366 |
|
367 |
/*
|
368 |
* Checks an image for consistency. Exit codes:
|
369 |
*
|
370 |
* 0 - Check completed, image is good
|
371 |
* 1 - Check not completed because of internal errors
|
372 |
* 2 - Check completed, image is corrupted
|
373 |
* 3 - Check completed, image has leaked clusters, but is good otherwise
|
374 |
*/
|
375 |
static int img_check(int argc, char **argv) |
376 |
{ |
377 |
int c, ret;
|
378 |
const char *filename, *fmt; |
379 |
BlockDriverState *bs; |
380 |
BdrvCheckResult result; |
381 |
int fix = 0; |
382 |
int flags = BDRV_O_FLAGS;
|
383 |
|
384 |
fmt = NULL;
|
385 |
for(;;) {
|
386 |
c = getopt(argc, argv, "f:hr:");
|
387 |
if (c == -1) { |
388 |
break;
|
389 |
} |
390 |
switch(c) {
|
391 |
case '?': |
392 |
case 'h': |
393 |
help(); |
394 |
break;
|
395 |
case 'f': |
396 |
fmt = optarg; |
397 |
break;
|
398 |
case 'r': |
399 |
flags |= BDRV_O_RDWR; |
400 |
|
401 |
if (!strcmp(optarg, "leaks")) { |
402 |
fix = BDRV_FIX_LEAKS; |
403 |
} else if (!strcmp(optarg, "all")) { |
404 |
fix = BDRV_FIX_LEAKS | BDRV_FIX_ERRORS; |
405 |
} else {
|
406 |
help(); |
407 |
} |
408 |
break;
|
409 |
} |
410 |
} |
411 |
if (optind >= argc) {
|
412 |
help(); |
413 |
} |
414 |
filename = argv[optind++]; |
415 |
|
416 |
bs = bdrv_new_open(filename, fmt, flags); |
417 |
if (!bs) {
|
418 |
return 1; |
419 |
} |
420 |
ret = bdrv_check(bs, &result, fix); |
421 |
|
422 |
if (ret == -ENOTSUP) {
|
423 |
error_report("This image format does not support checks");
|
424 |
bdrv_delete(bs); |
425 |
return 1; |
426 |
} |
427 |
|
428 |
if (result.corruptions_fixed || result.leaks_fixed) {
|
429 |
printf("The following inconsistencies were found and repaired:\n\n"
|
430 |
" %d leaked clusters\n"
|
431 |
" %d corruptions\n\n"
|
432 |
"Double checking the fixed image now...\n",
|
433 |
result.leaks_fixed, |
434 |
result.corruptions_fixed); |
435 |
ret = bdrv_check(bs, &result, 0);
|
436 |
} |
437 |
|
438 |
if (!(result.corruptions || result.leaks || result.check_errors)) {
|
439 |
printf("No errors were found on the image.\n");
|
440 |
} else {
|
441 |
if (result.corruptions) {
|
442 |
printf("\n%d errors were found on the image.\n"
|
443 |
"Data may be corrupted, or further writes to the image "
|
444 |
"may corrupt it.\n",
|
445 |
result.corruptions); |
446 |
} |
447 |
|
448 |
if (result.leaks) {
|
449 |
printf("\n%d leaked clusters were found on the image.\n"
|
450 |
"This means waste of disk space, but no harm to data.\n",
|
451 |
result.leaks); |
452 |
} |
453 |
|
454 |
if (result.check_errors) {
|
455 |
printf("\n%d internal errors have occurred during the check.\n",
|
456 |
result.check_errors); |
457 |
} |
458 |
} |
459 |
|
460 |
if (result.bfi.total_clusters != 0 && result.bfi.allocated_clusters != 0) { |
461 |
printf("%" PRId64 "/%" PRId64 "= %0.2f%% allocated, %0.2f%% fragmented\n", |
462 |
result.bfi.allocated_clusters, result.bfi.total_clusters, |
463 |
result.bfi.allocated_clusters * 100.0 / result.bfi.total_clusters, |
464 |
result.bfi.fragmented_clusters * 100.0 / result.bfi.allocated_clusters); |
465 |
} |
466 |
|
467 |
bdrv_delete(bs); |
468 |
|
469 |
if (ret < 0 || result.check_errors) { |
470 |
printf("\nAn error has occurred during the check: %s\n"
|
471 |
"The check is not complete and may have missed error.\n",
|
472 |
strerror(-ret)); |
473 |
return 1; |
474 |
} |
475 |
|
476 |
if (result.corruptions) {
|
477 |
return 2; |
478 |
} else if (result.leaks) { |
479 |
return 3; |
480 |
} else {
|
481 |
return 0; |
482 |
} |
483 |
} |
484 |
|
485 |
static int img_commit(int argc, char **argv) |
486 |
{ |
487 |
int c, ret, flags;
|
488 |
const char *filename, *fmt, *cache; |
489 |
BlockDriverState *bs; |
490 |
|
491 |
fmt = NULL;
|
492 |
cache = BDRV_DEFAULT_CACHE; |
493 |
for(;;) {
|
494 |
c = getopt(argc, argv, "f:ht:");
|
495 |
if (c == -1) { |
496 |
break;
|
497 |
} |
498 |
switch(c) {
|
499 |
case '?': |
500 |
case 'h': |
501 |
help(); |
502 |
break;
|
503 |
case 'f': |
504 |
fmt = optarg; |
505 |
break;
|
506 |
case 't': |
507 |
cache = optarg; |
508 |
break;
|
509 |
} |
510 |
} |
511 |
if (optind >= argc) {
|
512 |
help(); |
513 |
} |
514 |
filename = argv[optind++]; |
515 |
|
516 |
flags = BDRV_O_RDWR; |
517 |
ret = bdrv_parse_cache_flags(cache, &flags); |
518 |
if (ret < 0) { |
519 |
error_report("Invalid cache option: %s", cache);
|
520 |
return -1; |
521 |
} |
522 |
|
523 |
bs = bdrv_new_open(filename, fmt, flags); |
524 |
if (!bs) {
|
525 |
return 1; |
526 |
} |
527 |
ret = bdrv_commit(bs); |
528 |
switch(ret) {
|
529 |
case 0: |
530 |
printf("Image committed.\n");
|
531 |
break;
|
532 |
case -ENOENT:
|
533 |
error_report("No disk inserted");
|
534 |
break;
|
535 |
case -EACCES:
|
536 |
error_report("Image is read-only");
|
537 |
break;
|
538 |
case -ENOTSUP:
|
539 |
error_report("Image is already committed");
|
540 |
break;
|
541 |
default:
|
542 |
error_report("Error while committing image");
|
543 |
break;
|
544 |
} |
545 |
|
546 |
bdrv_delete(bs); |
547 |
if (ret) {
|
548 |
return 1; |
549 |
} |
550 |
return 0; |
551 |
} |
552 |
|
553 |
/*
|
554 |
* Returns true iff the first sector pointed to by 'buf' contains at least
|
555 |
* a non-NUL byte.
|
556 |
*
|
557 |
* 'pnum' is set to the number of sectors (including and immediately following
|
558 |
* the first one) that are known to be in the same allocated/unallocated state.
|
559 |
*/
|
560 |
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
561 |
{ |
562 |
bool is_zero;
|
563 |
int i;
|
564 |
|
565 |
if (n <= 0) { |
566 |
*pnum = 0;
|
567 |
return 0; |
568 |
} |
569 |
is_zero = buffer_is_zero(buf, 512);
|
570 |
for(i = 1; i < n; i++) { |
571 |
buf += 512;
|
572 |
if (is_zero != buffer_is_zero(buf, 512)) { |
573 |
break;
|
574 |
} |
575 |
} |
576 |
*pnum = i; |
577 |
return !is_zero;
|
578 |
} |
579 |
|
580 |
/*
|
581 |
* Like is_allocated_sectors, but if the buffer starts with a used sector,
|
582 |
* up to 'min' consecutive sectors containing zeros are ignored. This avoids
|
583 |
* breaking up write requests for only small sparse areas.
|
584 |
*/
|
585 |
static int is_allocated_sectors_min(const uint8_t *buf, int n, int *pnum, |
586 |
int min)
|
587 |
{ |
588 |
int ret;
|
589 |
int num_checked, num_used;
|
590 |
|
591 |
if (n < min) {
|
592 |
min = n; |
593 |
} |
594 |
|
595 |
ret = is_allocated_sectors(buf, n, pnum); |
596 |
if (!ret) {
|
597 |
return ret;
|
598 |
} |
599 |
|
600 |
num_used = *pnum; |
601 |
buf += BDRV_SECTOR_SIZE * *pnum; |
602 |
n -= *pnum; |
603 |
num_checked = num_used; |
604 |
|
605 |
while (n > 0) { |
606 |
ret = is_allocated_sectors(buf, n, pnum); |
607 |
|
608 |
buf += BDRV_SECTOR_SIZE * *pnum; |
609 |
n -= *pnum; |
610 |
num_checked += *pnum; |
611 |
if (ret) {
|
612 |
num_used = num_checked; |
613 |
} else if (*pnum >= min) { |
614 |
break;
|
615 |
} |
616 |
} |
617 |
|
618 |
*pnum = num_used; |
619 |
return 1; |
620 |
} |
621 |
|
622 |
/*
|
623 |
* Compares two buffers sector by sector. Returns 0 if the first sector of both
|
624 |
* buffers matches, non-zero otherwise.
|
625 |
*
|
626 |
* pnum is set to the number of sectors (including and immediately following
|
627 |
* the first one) that are known to have the same comparison result
|
628 |
*/
|
629 |
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, |
630 |
int *pnum)
|
631 |
{ |
632 |
int res, i;
|
633 |
|
634 |
if (n <= 0) { |
635 |
*pnum = 0;
|
636 |
return 0; |
637 |
} |
638 |
|
639 |
res = !!memcmp(buf1, buf2, 512);
|
640 |
for(i = 1; i < n; i++) { |
641 |
buf1 += 512;
|
642 |
buf2 += 512;
|
643 |
|
644 |
if (!!memcmp(buf1, buf2, 512) != res) { |
645 |
break;
|
646 |
} |
647 |
} |
648 |
|
649 |
*pnum = i; |
650 |
return res;
|
651 |
} |
652 |
|
653 |
#define IO_BUF_SIZE (2 * 1024 * 1024) |
654 |
|
655 |
static int img_convert(int argc, char **argv) |
656 |
{ |
657 |
int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, cluster_sectors; |
658 |
int progress = 0, flags; |
659 |
const char *fmt, *out_fmt, *cache, *out_baseimg, *out_filename; |
660 |
BlockDriver *drv, *proto_drv; |
661 |
BlockDriverState **bs = NULL, *out_bs = NULL; |
662 |
int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
663 |
uint64_t bs_sectors; |
664 |
uint8_t * buf = NULL;
|
665 |
const uint8_t *buf1;
|
666 |
BlockDriverInfo bdi; |
667 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
668 |
QEMUOptionParameter *out_baseimg_param; |
669 |
char *options = NULL; |
670 |
const char *snapshot_name = NULL; |
671 |
float local_progress;
|
672 |
int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */ |
673 |
|
674 |
fmt = NULL;
|
675 |
out_fmt = "raw";
|
676 |
cache = "unsafe";
|
677 |
out_baseimg = NULL;
|
678 |
compress = 0;
|
679 |
for(;;) {
|
680 |
c = getopt(argc, argv, "f:O:B:s:hce6o:pS:t:");
|
681 |
if (c == -1) { |
682 |
break;
|
683 |
} |
684 |
switch(c) {
|
685 |
case '?': |
686 |
case 'h': |
687 |
help(); |
688 |
break;
|
689 |
case 'f': |
690 |
fmt = optarg; |
691 |
break;
|
692 |
case 'O': |
693 |
out_fmt = optarg; |
694 |
break;
|
695 |
case 'B': |
696 |
out_baseimg = optarg; |
697 |
break;
|
698 |
case 'c': |
699 |
compress = 1;
|
700 |
break;
|
701 |
case 'e': |
702 |
error_report("option -e is deprecated, please use \'-o "
|
703 |
"encryption\' instead!");
|
704 |
return 1; |
705 |
case '6': |
706 |
error_report("option -6 is deprecated, please use \'-o "
|
707 |
"compat6\' instead!");
|
708 |
return 1; |
709 |
case 'o': |
710 |
options = optarg; |
711 |
break;
|
712 |
case 's': |
713 |
snapshot_name = optarg; |
714 |
break;
|
715 |
case 'S': |
716 |
{ |
717 |
int64_t sval; |
718 |
char *end;
|
719 |
sval = strtosz_suffix(optarg, &end, STRTOSZ_DEFSUFFIX_B); |
720 |
if (sval < 0 || *end) { |
721 |
error_report("Invalid minimum zero buffer size for sparse output specified");
|
722 |
return 1; |
723 |
} |
724 |
|
725 |
min_sparse = sval / BDRV_SECTOR_SIZE; |
726 |
break;
|
727 |
} |
728 |
case 'p': |
729 |
progress = 1;
|
730 |
break;
|
731 |
case 't': |
732 |
cache = optarg; |
733 |
break;
|
734 |
} |
735 |
} |
736 |
|
737 |
bs_n = argc - optind - 1;
|
738 |
if (bs_n < 1) { |
739 |
help(); |
740 |
} |
741 |
|
742 |
out_filename = argv[argc - 1];
|
743 |
|
744 |
/* Initialize before goto out */
|
745 |
qemu_progress_init(progress, 2.0); |
746 |
|
747 |
if (options && is_help_option(options)) {
|
748 |
ret = print_block_option_help(out_filename, out_fmt); |
749 |
goto out;
|
750 |
} |
751 |
|
752 |
if (bs_n > 1 && out_baseimg) { |
753 |
error_report("-B makes no sense when concatenating multiple input "
|
754 |
"images");
|
755 |
ret = -1;
|
756 |
goto out;
|
757 |
} |
758 |
|
759 |
qemu_progress_print(0, 100); |
760 |
|
761 |
bs = g_malloc0(bs_n * sizeof(BlockDriverState *));
|
762 |
|
763 |
total_sectors = 0;
|
764 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
765 |
bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); |
766 |
if (!bs[bs_i]) {
|
767 |
error_report("Could not open '%s'", argv[optind + bs_i]);
|
768 |
ret = -1;
|
769 |
goto out;
|
770 |
} |
771 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
772 |
total_sectors += bs_sectors; |
773 |
} |
774 |
|
775 |
if (snapshot_name != NULL) { |
776 |
if (bs_n > 1) { |
777 |
error_report("No support for concatenating multiple snapshot");
|
778 |
ret = -1;
|
779 |
goto out;
|
780 |
} |
781 |
if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) { |
782 |
error_report("Failed to load snapshot");
|
783 |
ret = -1;
|
784 |
goto out;
|
785 |
} |
786 |
} |
787 |
|
788 |
/* Find driver and parse its options */
|
789 |
drv = bdrv_find_format(out_fmt); |
790 |
if (!drv) {
|
791 |
error_report("Unknown file format '%s'", out_fmt);
|
792 |
ret = -1;
|
793 |
goto out;
|
794 |
} |
795 |
|
796 |
proto_drv = bdrv_find_protocol(out_filename); |
797 |
if (!proto_drv) {
|
798 |
error_report("Unknown protocol '%s'", out_filename);
|
799 |
ret = -1;
|
800 |
goto out;
|
801 |
} |
802 |
|
803 |
create_options = append_option_parameters(create_options, |
804 |
drv->create_options); |
805 |
create_options = append_option_parameters(create_options, |
806 |
proto_drv->create_options); |
807 |
|
808 |
if (options) {
|
809 |
param = parse_option_parameters(options, create_options, param); |
810 |
if (param == NULL) { |
811 |
error_report("Invalid options for file format '%s'.", out_fmt);
|
812 |
ret = -1;
|
813 |
goto out;
|
814 |
} |
815 |
} else {
|
816 |
param = parse_option_parameters("", create_options, param);
|
817 |
} |
818 |
|
819 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
|
820 |
ret = add_old_style_options(out_fmt, param, out_baseimg, NULL);
|
821 |
if (ret < 0) { |
822 |
goto out;
|
823 |
} |
824 |
|
825 |
/* Get backing file name if -o backing_file was used */
|
826 |
out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
827 |
if (out_baseimg_param) {
|
828 |
out_baseimg = out_baseimg_param->value.s; |
829 |
} |
830 |
|
831 |
/* Check if compression is supported */
|
832 |
if (compress) {
|
833 |
QEMUOptionParameter *encryption = |
834 |
get_option_parameter(param, BLOCK_OPT_ENCRYPT); |
835 |
QEMUOptionParameter *preallocation = |
836 |
get_option_parameter(param, BLOCK_OPT_PREALLOC); |
837 |
|
838 |
if (!drv->bdrv_write_compressed) {
|
839 |
error_report("Compression not supported for this file format");
|
840 |
ret = -1;
|
841 |
goto out;
|
842 |
} |
843 |
|
844 |
if (encryption && encryption->value.n) {
|
845 |
error_report("Compression and encryption not supported at "
|
846 |
"the same time");
|
847 |
ret = -1;
|
848 |
goto out;
|
849 |
} |
850 |
|
851 |
if (preallocation && preallocation->value.s
|
852 |
&& strcmp(preallocation->value.s, "off"))
|
853 |
{ |
854 |
error_report("Compression and preallocation not supported at "
|
855 |
"the same time");
|
856 |
ret = -1;
|
857 |
goto out;
|
858 |
} |
859 |
} |
860 |
|
861 |
/* Create the new image */
|
862 |
ret = bdrv_create(drv, out_filename, param); |
863 |
if (ret < 0) { |
864 |
if (ret == -ENOTSUP) {
|
865 |
error_report("Formatting not supported for file format '%s'",
|
866 |
out_fmt); |
867 |
} else if (ret == -EFBIG) { |
868 |
error_report("The image size is too large for file format '%s'",
|
869 |
out_fmt); |
870 |
} else {
|
871 |
error_report("%s: error while converting %s: %s",
|
872 |
out_filename, out_fmt, strerror(-ret)); |
873 |
} |
874 |
goto out;
|
875 |
} |
876 |
|
877 |
flags = BDRV_O_RDWR; |
878 |
ret = bdrv_parse_cache_flags(cache, &flags); |
879 |
if (ret < 0) { |
880 |
error_report("Invalid cache option: %s", cache);
|
881 |
return -1; |
882 |
} |
883 |
|
884 |
out_bs = bdrv_new_open(out_filename, out_fmt, flags); |
885 |
if (!out_bs) {
|
886 |
ret = -1;
|
887 |
goto out;
|
888 |
} |
889 |
|
890 |
bs_i = 0;
|
891 |
bs_offset = 0;
|
892 |
bdrv_get_geometry(bs[0], &bs_sectors);
|
893 |
buf = qemu_blockalign(out_bs, IO_BUF_SIZE); |
894 |
|
895 |
if (compress) {
|
896 |
ret = bdrv_get_info(out_bs, &bdi); |
897 |
if (ret < 0) { |
898 |
error_report("could not get block driver info");
|
899 |
goto out;
|
900 |
} |
901 |
cluster_size = bdi.cluster_size; |
902 |
if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { |
903 |
error_report("invalid cluster size");
|
904 |
ret = -1;
|
905 |
goto out;
|
906 |
} |
907 |
cluster_sectors = cluster_size >> 9;
|
908 |
sector_num = 0;
|
909 |
|
910 |
nb_sectors = total_sectors; |
911 |
local_progress = (float)100 / |
912 |
(nb_sectors / MIN(nb_sectors, cluster_sectors)); |
913 |
|
914 |
for(;;) {
|
915 |
int64_t bs_num; |
916 |
int remainder;
|
917 |
uint8_t *buf2; |
918 |
|
919 |
nb_sectors = total_sectors - sector_num; |
920 |
if (nb_sectors <= 0) |
921 |
break;
|
922 |
if (nb_sectors >= cluster_sectors)
|
923 |
n = cluster_sectors; |
924 |
else
|
925 |
n = nb_sectors; |
926 |
|
927 |
bs_num = sector_num - bs_offset; |
928 |
assert (bs_num >= 0);
|
929 |
remainder = n; |
930 |
buf2 = buf; |
931 |
while (remainder > 0) { |
932 |
int nlow;
|
933 |
while (bs_num == bs_sectors) {
|
934 |
bs_i++; |
935 |
assert (bs_i < bs_n); |
936 |
bs_offset += bs_sectors; |
937 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
938 |
bs_num = 0;
|
939 |
/* printf("changing part: sector_num=%" PRId64 ", "
|
940 |
"bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64
|
941 |
"\n", sector_num, bs_i, bs_offset, bs_sectors); */
|
942 |
} |
943 |
assert (bs_num < bs_sectors); |
944 |
|
945 |
nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; |
946 |
|
947 |
ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); |
948 |
if (ret < 0) { |
949 |
error_report("error while reading sector %" PRId64 ": %s", |
950 |
bs_num, strerror(-ret)); |
951 |
goto out;
|
952 |
} |
953 |
|
954 |
buf2 += nlow * 512;
|
955 |
bs_num += nlow; |
956 |
|
957 |
remainder -= nlow; |
958 |
} |
959 |
assert (remainder == 0);
|
960 |
|
961 |
if (n < cluster_sectors) {
|
962 |
memset(buf + n * 512, 0, cluster_size - n * 512); |
963 |
} |
964 |
if (!buffer_is_zero(buf, cluster_size)) {
|
965 |
ret = bdrv_write_compressed(out_bs, sector_num, buf, |
966 |
cluster_sectors); |
967 |
if (ret != 0) { |
968 |
error_report("error while compressing sector %" PRId64
|
969 |
": %s", sector_num, strerror(-ret));
|
970 |
goto out;
|
971 |
} |
972 |
} |
973 |
sector_num += n; |
974 |
qemu_progress_print(local_progress, 100);
|
975 |
} |
976 |
/* signal EOF to align */
|
977 |
bdrv_write_compressed(out_bs, 0, NULL, 0); |
978 |
} else {
|
979 |
int has_zero_init = bdrv_has_zero_init(out_bs);
|
980 |
|
981 |
sector_num = 0; // total number of sectors converted so far |
982 |
nb_sectors = total_sectors - sector_num; |
983 |
local_progress = (float)100 / |
984 |
(nb_sectors / MIN(nb_sectors, IO_BUF_SIZE / 512));
|
985 |
|
986 |
for(;;) {
|
987 |
nb_sectors = total_sectors - sector_num; |
988 |
if (nb_sectors <= 0) { |
989 |
break;
|
990 |
} |
991 |
if (nb_sectors >= (IO_BUF_SIZE / 512)) { |
992 |
n = (IO_BUF_SIZE / 512);
|
993 |
} else {
|
994 |
n = nb_sectors; |
995 |
} |
996 |
|
997 |
while (sector_num - bs_offset >= bs_sectors) {
|
998 |
bs_i ++; |
999 |
assert (bs_i < bs_n); |
1000 |
bs_offset += bs_sectors; |
1001 |
bdrv_get_geometry(bs[bs_i], &bs_sectors); |
1002 |
/* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, "
|
1003 |
"bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n",
|
1004 |
sector_num, bs_i, bs_offset, bs_sectors); */
|
1005 |
} |
1006 |
|
1007 |
if (n > bs_offset + bs_sectors - sector_num) {
|
1008 |
n = bs_offset + bs_sectors - sector_num; |
1009 |
} |
1010 |
|
1011 |
if (has_zero_init) {
|
1012 |
/* If the output image is being created as a copy on write image,
|
1013 |
assume that sectors which are unallocated in the input image
|
1014 |
are present in both the output's and input's base images (no
|
1015 |
need to copy them). */
|
1016 |
if (out_baseimg) {
|
1017 |
if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
|
1018 |
n, &n1)) { |
1019 |
sector_num += n1; |
1020 |
continue;
|
1021 |
} |
1022 |
/* The next 'n1' sectors are allocated in the input image. Copy
|
1023 |
only those as they may be followed by unallocated sectors. */
|
1024 |
n = n1; |
1025 |
} |
1026 |
} else {
|
1027 |
n1 = n; |
1028 |
} |
1029 |
|
1030 |
ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); |
1031 |
if (ret < 0) { |
1032 |
error_report("error while reading sector %" PRId64 ": %s", |
1033 |
sector_num - bs_offset, strerror(-ret)); |
1034 |
goto out;
|
1035 |
} |
1036 |
/* NOTE: at the same time we convert, we do not write zero
|
1037 |
sectors to have a chance to compress the image. Ideally, we
|
1038 |
should add a specific call to have the info to go faster */
|
1039 |
buf1 = buf; |
1040 |
while (n > 0) { |
1041 |
/* If the output image is being created as a copy on write image,
|
1042 |
copy all sectors even the ones containing only NUL bytes,
|
1043 |
because they may differ from the sectors in the base image.
|
1044 |
|
1045 |
If the output is to a host device, we also write out
|
1046 |
sectors that are entirely 0, since whatever data was
|
1047 |
already there is garbage, not 0s. */
|
1048 |
if (!has_zero_init || out_baseimg ||
|
1049 |
is_allocated_sectors_min(buf1, n, &n1, min_sparse)) { |
1050 |
ret = bdrv_write(out_bs, sector_num, buf1, n1); |
1051 |
if (ret < 0) { |
1052 |
error_report("error while writing sector %" PRId64
|
1053 |
": %s", sector_num, strerror(-ret));
|
1054 |
goto out;
|
1055 |
} |
1056 |
} |
1057 |
sector_num += n1; |
1058 |
n -= n1; |
1059 |
buf1 += n1 * 512;
|
1060 |
} |
1061 |
qemu_progress_print(local_progress, 100);
|
1062 |
} |
1063 |
} |
1064 |
out:
|
1065 |
qemu_progress_end(); |
1066 |
free_option_parameters(create_options); |
1067 |
free_option_parameters(param); |
1068 |
qemu_vfree(buf); |
1069 |
if (out_bs) {
|
1070 |
bdrv_delete(out_bs); |
1071 |
} |
1072 |
if (bs) {
|
1073 |
for (bs_i = 0; bs_i < bs_n; bs_i++) { |
1074 |
if (bs[bs_i]) {
|
1075 |
bdrv_delete(bs[bs_i]); |
1076 |
} |
1077 |
} |
1078 |
g_free(bs); |
1079 |
} |
1080 |
if (ret) {
|
1081 |
return 1; |
1082 |
} |
1083 |
return 0; |
1084 |
} |
1085 |
|
1086 |
|
1087 |
static void dump_snapshots(BlockDriverState *bs) |
1088 |
{ |
1089 |
QEMUSnapshotInfo *sn_tab, *sn; |
1090 |
int nb_sns, i;
|
1091 |
char buf[256]; |
1092 |
|
1093 |
nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
1094 |
if (nb_sns <= 0) |
1095 |
return;
|
1096 |
printf("Snapshot list:\n");
|
1097 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); |
1098 |
for(i = 0; i < nb_sns; i++) { |
1099 |
sn = &sn_tab[i]; |
1100 |
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); |
1101 |
} |
1102 |
g_free(sn_tab); |
1103 |
} |
1104 |
|
1105 |
static int img_info(int argc, char **argv) |
1106 |
{ |
1107 |
int c;
|
1108 |
const char *filename, *fmt; |
1109 |
BlockDriverState *bs; |
1110 |
char size_buf[128], dsize_buf[128]; |
1111 |
uint64_t total_sectors; |
1112 |
int64_t allocated_size; |
1113 |
char backing_filename[1024]; |
1114 |
char backing_filename2[1024]; |
1115 |
BlockDriverInfo bdi; |
1116 |
|
1117 |
fmt = NULL;
|
1118 |
for(;;) {
|
1119 |
c = getopt(argc, argv, "f:h");
|
1120 |
if (c == -1) { |
1121 |
break;
|
1122 |
} |
1123 |
switch(c) {
|
1124 |
case '?': |
1125 |
case 'h': |
1126 |
help(); |
1127 |
break;
|
1128 |
case 'f': |
1129 |
fmt = optarg; |
1130 |
break;
|
1131 |
} |
1132 |
} |
1133 |
if (optind >= argc) {
|
1134 |
help(); |
1135 |
} |
1136 |
filename = argv[optind++]; |
1137 |
|
1138 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); |
1139 |
if (!bs) {
|
1140 |
return 1; |
1141 |
} |
1142 |
bdrv_get_geometry(bs, &total_sectors); |
1143 |
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); |
1144 |
allocated_size = bdrv_get_allocated_file_size(bs); |
1145 |
if (allocated_size < 0) { |
1146 |
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
1147 |
} else {
|
1148 |
get_human_readable_size(dsize_buf, sizeof(dsize_buf),
|
1149 |
allocated_size); |
1150 |
} |
1151 |
printf("image: %s\n"
|
1152 |
"file format: %s\n"
|
1153 |
"virtual size: %s (%" PRId64 " bytes)\n" |
1154 |
"disk size: %s\n",
|
1155 |
filename, bdrv_get_format_name(bs), size_buf, |
1156 |
(total_sectors * 512),
|
1157 |
dsize_buf); |
1158 |
if (bdrv_is_encrypted(bs)) {
|
1159 |
printf("encrypted: yes\n");
|
1160 |
} |
1161 |
if (bdrv_get_info(bs, &bdi) >= 0) { |
1162 |
if (bdi.cluster_size != 0) { |
1163 |
printf("cluster_size: %d\n", bdi.cluster_size);
|
1164 |
} |
1165 |
if (bdi.is_dirty) {
|
1166 |
printf("cleanly shut down: no\n");
|
1167 |
} |
1168 |
} |
1169 |
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
|
1170 |
if (backing_filename[0] != '\0') { |
1171 |
bdrv_get_full_backing_filename(bs, backing_filename2, |
1172 |
sizeof(backing_filename2));
|
1173 |
printf("backing file: %s", backing_filename);
|
1174 |
if (strcmp(backing_filename, backing_filename2) != 0) { |
1175 |
printf(" (actual path: %s)", backing_filename2);
|
1176 |
} |
1177 |
putchar('\n');
|
1178 |
} |
1179 |
dump_snapshots(bs); |
1180 |
bdrv_delete(bs); |
1181 |
return 0; |
1182 |
} |
1183 |
|
1184 |
#define SNAPSHOT_LIST 1 |
1185 |
#define SNAPSHOT_CREATE 2 |
1186 |
#define SNAPSHOT_APPLY 3 |
1187 |
#define SNAPSHOT_DELETE 4 |
1188 |
|
1189 |
static int img_snapshot(int argc, char **argv) |
1190 |
{ |
1191 |
BlockDriverState *bs; |
1192 |
QEMUSnapshotInfo sn; |
1193 |
char *filename, *snapshot_name = NULL; |
1194 |
int c, ret = 0, bdrv_oflags; |
1195 |
int action = 0; |
1196 |
qemu_timeval tv; |
1197 |
|
1198 |
bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR; |
1199 |
/* Parse commandline parameters */
|
1200 |
for(;;) {
|
1201 |
c = getopt(argc, argv, "la:c:d:h");
|
1202 |
if (c == -1) { |
1203 |
break;
|
1204 |
} |
1205 |
switch(c) {
|
1206 |
case '?': |
1207 |
case 'h': |
1208 |
help(); |
1209 |
return 0; |
1210 |
case 'l': |
1211 |
if (action) {
|
1212 |
help(); |
1213 |
return 0; |
1214 |
} |
1215 |
action = SNAPSHOT_LIST; |
1216 |
bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
|
1217 |
break;
|
1218 |
case 'a': |
1219 |
if (action) {
|
1220 |
help(); |
1221 |
return 0; |
1222 |
} |
1223 |
action = SNAPSHOT_APPLY; |
1224 |
snapshot_name = optarg; |
1225 |
break;
|
1226 |
case 'c': |
1227 |
if (action) {
|
1228 |
help(); |
1229 |
return 0; |
1230 |
} |
1231 |
action = SNAPSHOT_CREATE; |
1232 |
snapshot_name = optarg; |
1233 |
break;
|
1234 |
case 'd': |
1235 |
if (action) {
|
1236 |
help(); |
1237 |
return 0; |
1238 |
} |
1239 |
action = SNAPSHOT_DELETE; |
1240 |
snapshot_name = optarg; |
1241 |
break;
|
1242 |
} |
1243 |
} |
1244 |
|
1245 |
if (optind >= argc) {
|
1246 |
help(); |
1247 |
} |
1248 |
filename = argv[optind++]; |
1249 |
|
1250 |
/* Open the image */
|
1251 |
bs = bdrv_new_open(filename, NULL, bdrv_oflags);
|
1252 |
if (!bs) {
|
1253 |
return 1; |
1254 |
} |
1255 |
|
1256 |
/* Perform the requested action */
|
1257 |
switch(action) {
|
1258 |
case SNAPSHOT_LIST:
|
1259 |
dump_snapshots(bs); |
1260 |
break;
|
1261 |
|
1262 |
case SNAPSHOT_CREATE:
|
1263 |
memset(&sn, 0, sizeof(sn)); |
1264 |
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
|
1265 |
|
1266 |
qemu_gettimeofday(&tv); |
1267 |
sn.date_sec = tv.tv_sec; |
1268 |
sn.date_nsec = tv.tv_usec * 1000;
|
1269 |
|
1270 |
ret = bdrv_snapshot_create(bs, &sn); |
1271 |
if (ret) {
|
1272 |
error_report("Could not create snapshot '%s': %d (%s)",
|
1273 |
snapshot_name, ret, strerror(-ret)); |
1274 |
} |
1275 |
break;
|
1276 |
|
1277 |
case SNAPSHOT_APPLY:
|
1278 |
ret = bdrv_snapshot_goto(bs, snapshot_name); |
1279 |
if (ret) {
|
1280 |
error_report("Could not apply snapshot '%s': %d (%s)",
|
1281 |
snapshot_name, ret, strerror(-ret)); |
1282 |
} |
1283 |
break;
|
1284 |
|
1285 |
case SNAPSHOT_DELETE:
|
1286 |
ret = bdrv_snapshot_delete(bs, snapshot_name); |
1287 |
if (ret) {
|
1288 |
error_report("Could not delete snapshot '%s': %d (%s)",
|
1289 |
snapshot_name, ret, strerror(-ret)); |
1290 |
} |
1291 |
break;
|
1292 |
} |
1293 |
|
1294 |
/* Cleanup */
|
1295 |
bdrv_delete(bs); |
1296 |
if (ret) {
|
1297 |
return 1; |
1298 |
} |
1299 |
return 0; |
1300 |
} |
1301 |
|
1302 |
static int img_rebase(int argc, char **argv) |
1303 |
{ |
1304 |
BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; |
1305 |
BlockDriver *old_backing_drv, *new_backing_drv; |
1306 |
char *filename;
|
1307 |
const char *fmt, *cache, *out_basefmt, *out_baseimg; |
1308 |
int c, flags, ret;
|
1309 |
int unsafe = 0; |
1310 |
int progress = 0; |
1311 |
|
1312 |
/* Parse commandline parameters */
|
1313 |
fmt = NULL;
|
1314 |
cache = BDRV_DEFAULT_CACHE; |
1315 |
out_baseimg = NULL;
|
1316 |
out_basefmt = NULL;
|
1317 |
for(;;) {
|
1318 |
c = getopt(argc, argv, "uhf:F:b:pt:");
|
1319 |
if (c == -1) { |
1320 |
break;
|
1321 |
} |
1322 |
switch(c) {
|
1323 |
case '?': |
1324 |
case 'h': |
1325 |
help(); |
1326 |
return 0; |
1327 |
case 'f': |
1328 |
fmt = optarg; |
1329 |
break;
|
1330 |
case 'F': |
1331 |
out_basefmt = optarg; |
1332 |
break;
|
1333 |
case 'b': |
1334 |
out_baseimg = optarg; |
1335 |
break;
|
1336 |
case 'u': |
1337 |
unsafe = 1;
|
1338 |
break;
|
1339 |
case 'p': |
1340 |
progress = 1;
|
1341 |
break;
|
1342 |
case 't': |
1343 |
cache = optarg; |
1344 |
break;
|
1345 |
} |
1346 |
} |
1347 |
|
1348 |
if ((optind >= argc) || (!unsafe && !out_baseimg)) {
|
1349 |
help(); |
1350 |
} |
1351 |
filename = argv[optind++]; |
1352 |
|
1353 |
qemu_progress_init(progress, 2.0); |
1354 |
qemu_progress_print(0, 100); |
1355 |
|
1356 |
flags = BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
|
1357 |
ret = bdrv_parse_cache_flags(cache, &flags); |
1358 |
if (ret < 0) { |
1359 |
error_report("Invalid cache option: %s", cache);
|
1360 |
return -1; |
1361 |
} |
1362 |
|
1363 |
/*
|
1364 |
* Open the images.
|
1365 |
*
|
1366 |
* Ignore the old backing file for unsafe rebase in case we want to correct
|
1367 |
* the reference to a renamed or moved backing file.
|
1368 |
*/
|
1369 |
bs = bdrv_new_open(filename, fmt, flags); |
1370 |
if (!bs) {
|
1371 |
return 1; |
1372 |
} |
1373 |
|
1374 |
/* Find the right drivers for the backing files */
|
1375 |
old_backing_drv = NULL;
|
1376 |
new_backing_drv = NULL;
|
1377 |
|
1378 |
if (!unsafe && bs->backing_format[0] != '\0') { |
1379 |
old_backing_drv = bdrv_find_format(bs->backing_format); |
1380 |
if (old_backing_drv == NULL) { |
1381 |
error_report("Invalid format name: '%s'", bs->backing_format);
|
1382 |
ret = -1;
|
1383 |
goto out;
|
1384 |
} |
1385 |
} |
1386 |
|
1387 |
if (out_basefmt != NULL) { |
1388 |
new_backing_drv = bdrv_find_format(out_basefmt); |
1389 |
if (new_backing_drv == NULL) { |
1390 |
error_report("Invalid format name: '%s'", out_basefmt);
|
1391 |
ret = -1;
|
1392 |
goto out;
|
1393 |
} |
1394 |
} |
1395 |
|
1396 |
/* For safe rebasing we need to compare old and new backing file */
|
1397 |
if (unsafe) {
|
1398 |
/* Make the compiler happy */
|
1399 |
bs_old_backing = NULL;
|
1400 |
bs_new_backing = NULL;
|
1401 |
} else {
|
1402 |
char backing_name[1024]; |
1403 |
|
1404 |
bs_old_backing = bdrv_new("old_backing");
|
1405 |
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
|
1406 |
ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, |
1407 |
old_backing_drv); |
1408 |
if (ret) {
|
1409 |
error_report("Could not open old backing file '%s'", backing_name);
|
1410 |
goto out;
|
1411 |
} |
1412 |
|
1413 |
bs_new_backing = bdrv_new("new_backing");
|
1414 |
ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS, |
1415 |
new_backing_drv); |
1416 |
if (ret) {
|
1417 |
error_report("Could not open new backing file '%s'", out_baseimg);
|
1418 |
goto out;
|
1419 |
} |
1420 |
} |
1421 |
|
1422 |
/*
|
1423 |
* Check each unallocated cluster in the COW file. If it is unallocated,
|
1424 |
* accesses go to the backing file. We must therefore compare this cluster
|
1425 |
* in the old and new backing file, and if they differ we need to copy it
|
1426 |
* from the old backing file into the COW file.
|
1427 |
*
|
1428 |
* If qemu-img crashes during this step, no harm is done. The content of
|
1429 |
* the image is the same as the original one at any time.
|
1430 |
*/
|
1431 |
if (!unsafe) {
|
1432 |
uint64_t num_sectors; |
1433 |
uint64_t old_backing_num_sectors; |
1434 |
uint64_t new_backing_num_sectors; |
1435 |
uint64_t sector; |
1436 |
int n;
|
1437 |
uint8_t * buf_old; |
1438 |
uint8_t * buf_new; |
1439 |
float local_progress;
|
1440 |
|
1441 |
buf_old = qemu_blockalign(bs, IO_BUF_SIZE); |
1442 |
buf_new = qemu_blockalign(bs, IO_BUF_SIZE); |
1443 |
|
1444 |
bdrv_get_geometry(bs, &num_sectors); |
1445 |
bdrv_get_geometry(bs_old_backing, &old_backing_num_sectors); |
1446 |
bdrv_get_geometry(bs_new_backing, &new_backing_num_sectors); |
1447 |
|
1448 |
local_progress = (float)100 / |
1449 |
(num_sectors / MIN(num_sectors, IO_BUF_SIZE / 512));
|
1450 |
for (sector = 0; sector < num_sectors; sector += n) { |
1451 |
|
1452 |
/* How many sectors can we handle with the next read? */
|
1453 |
if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { |
1454 |
n = (IO_BUF_SIZE / 512);
|
1455 |
} else {
|
1456 |
n = num_sectors - sector; |
1457 |
} |
1458 |
|
1459 |
/* If the cluster is allocated, we don't need to take action */
|
1460 |
ret = bdrv_is_allocated(bs, sector, n, &n); |
1461 |
if (ret) {
|
1462 |
continue;
|
1463 |
} |
1464 |
|
1465 |
/*
|
1466 |
* Read old and new backing file and take into consideration that
|
1467 |
* backing files may be smaller than the COW image.
|
1468 |
*/
|
1469 |
if (sector >= old_backing_num_sectors) {
|
1470 |
memset(buf_old, 0, n * BDRV_SECTOR_SIZE);
|
1471 |
} else {
|
1472 |
if (sector + n > old_backing_num_sectors) {
|
1473 |
n = old_backing_num_sectors - sector; |
1474 |
} |
1475 |
|
1476 |
ret = bdrv_read(bs_old_backing, sector, buf_old, n); |
1477 |
if (ret < 0) { |
1478 |
error_report("error while reading from old backing file");
|
1479 |
goto out;
|
1480 |
} |
1481 |
} |
1482 |
|
1483 |
if (sector >= new_backing_num_sectors) {
|
1484 |
memset(buf_new, 0, n * BDRV_SECTOR_SIZE);
|
1485 |
} else {
|
1486 |
if (sector + n > new_backing_num_sectors) {
|
1487 |
n = new_backing_num_sectors - sector; |
1488 |
} |
1489 |
|
1490 |
ret = bdrv_read(bs_new_backing, sector, buf_new, n); |
1491 |
if (ret < 0) { |
1492 |
error_report("error while reading from new backing file");
|
1493 |
goto out;
|
1494 |
} |
1495 |
} |
1496 |
|
1497 |
/* If they differ, we need to write to the COW file */
|
1498 |
uint64_t written = 0;
|
1499 |
|
1500 |
while (written < n) {
|
1501 |
int pnum;
|
1502 |
|
1503 |
if (compare_sectors(buf_old + written * 512, |
1504 |
buf_new + written * 512, n - written, &pnum))
|
1505 |
{ |
1506 |
ret = bdrv_write(bs, sector + written, |
1507 |
buf_old + written * 512, pnum);
|
1508 |
if (ret < 0) { |
1509 |
error_report("Error while writing to COW image: %s",
|
1510 |
strerror(-ret)); |
1511 |
goto out;
|
1512 |
} |
1513 |
} |
1514 |
|
1515 |
written += pnum; |
1516 |
} |
1517 |
qemu_progress_print(local_progress, 100);
|
1518 |
} |
1519 |
|
1520 |
qemu_vfree(buf_old); |
1521 |
qemu_vfree(buf_new); |
1522 |
} |
1523 |
|
1524 |
/*
|
1525 |
* Change the backing file. All clusters that are different from the old
|
1526 |
* backing file are overwritten in the COW file now, so the visible content
|
1527 |
* doesn't change when we switch the backing file.
|
1528 |
*/
|
1529 |
ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
1530 |
if (ret == -ENOSPC) {
|
1531 |
error_report("Could not change the backing file to '%s': No "
|
1532 |
"space left in the file header", out_baseimg);
|
1533 |
} else if (ret < 0) { |
1534 |
error_report("Could not change the backing file to '%s': %s",
|
1535 |
out_baseimg, strerror(-ret)); |
1536 |
} |
1537 |
|
1538 |
qemu_progress_print(100, 0); |
1539 |
/*
|
1540 |
* TODO At this point it is possible to check if any clusters that are
|
1541 |
* allocated in the COW file are the same in the backing file. If so, they
|
1542 |
* could be dropped from the COW file. Don't do this before switching the
|
1543 |
* backing file, in case of a crash this would lead to corruption.
|
1544 |
*/
|
1545 |
out:
|
1546 |
qemu_progress_end(); |
1547 |
/* Cleanup */
|
1548 |
if (!unsafe) {
|
1549 |
if (bs_old_backing != NULL) { |
1550 |
bdrv_delete(bs_old_backing); |
1551 |
} |
1552 |
if (bs_new_backing != NULL) { |
1553 |
bdrv_delete(bs_new_backing); |
1554 |
} |
1555 |
} |
1556 |
|
1557 |
bdrv_delete(bs); |
1558 |
if (ret) {
|
1559 |
return 1; |
1560 |
} |
1561 |
return 0; |
1562 |
} |
1563 |
|
1564 |
static int img_resize(int argc, char **argv) |
1565 |
{ |
1566 |
int c, ret, relative;
|
1567 |
const char *filename, *fmt, *size; |
1568 |
int64_t n, total_size; |
1569 |
BlockDriverState *bs = NULL;
|
1570 |
QemuOpts *param; |
1571 |
static QemuOptsList resize_options = {
|
1572 |
.name = "resize_options",
|
1573 |
.head = QTAILQ_HEAD_INITIALIZER(resize_options.head), |
1574 |
.desc = { |
1575 |
{ |
1576 |
.name = BLOCK_OPT_SIZE, |
1577 |
.type = QEMU_OPT_SIZE, |
1578 |
.help = "Virtual disk size"
|
1579 |
}, { |
1580 |
/* end of list */
|
1581 |
} |
1582 |
}, |
1583 |
}; |
1584 |
|
1585 |
/* Remove size from argv manually so that negative numbers are not treated
|
1586 |
* as options by getopt. */
|
1587 |
if (argc < 3) { |
1588 |
help(); |
1589 |
return 1; |
1590 |
} |
1591 |
|
1592 |
size = argv[--argc]; |
1593 |
|
1594 |
/* Parse getopt arguments */
|
1595 |
fmt = NULL;
|
1596 |
for(;;) {
|
1597 |
c = getopt(argc, argv, "f:h");
|
1598 |
if (c == -1) { |
1599 |
break;
|
1600 |
} |
1601 |
switch(c) {
|
1602 |
case '?': |
1603 |
case 'h': |
1604 |
help(); |
1605 |
break;
|
1606 |
case 'f': |
1607 |
fmt = optarg; |
1608 |
break;
|
1609 |
} |
1610 |
} |
1611 |
if (optind >= argc) {
|
1612 |
help(); |
1613 |
} |
1614 |
filename = argv[optind++]; |
1615 |
|
1616 |
/* Choose grow, shrink, or absolute resize mode */
|
1617 |
switch (size[0]) { |
1618 |
case '+': |
1619 |
relative = 1;
|
1620 |
size++; |
1621 |
break;
|
1622 |
case '-': |
1623 |
relative = -1;
|
1624 |
size++; |
1625 |
break;
|
1626 |
default:
|
1627 |
relative = 0;
|
1628 |
break;
|
1629 |
} |
1630 |
|
1631 |
/* Parse size */
|
1632 |
param = qemu_opts_create(&resize_options, NULL, 0, NULL); |
1633 |
if (qemu_opt_set(param, BLOCK_OPT_SIZE, size)) {
|
1634 |
/* Error message already printed when size parsing fails */
|
1635 |
ret = -1;
|
1636 |
qemu_opts_del(param); |
1637 |
goto out;
|
1638 |
} |
1639 |
n = qemu_opt_get_size(param, BLOCK_OPT_SIZE, 0);
|
1640 |
qemu_opts_del(param); |
1641 |
|
1642 |
bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
1643 |
if (!bs) {
|
1644 |
ret = -1;
|
1645 |
goto out;
|
1646 |
} |
1647 |
|
1648 |
if (relative) {
|
1649 |
total_size = bdrv_getlength(bs) + n * relative; |
1650 |
} else {
|
1651 |
total_size = n; |
1652 |
} |
1653 |
if (total_size <= 0) { |
1654 |
error_report("New image size must be positive");
|
1655 |
ret = -1;
|
1656 |
goto out;
|
1657 |
} |
1658 |
|
1659 |
ret = bdrv_truncate(bs, total_size); |
1660 |
switch (ret) {
|
1661 |
case 0: |
1662 |
printf("Image resized.\n");
|
1663 |
break;
|
1664 |
case -ENOTSUP:
|
1665 |
error_report("This image does not support resize");
|
1666 |
break;
|
1667 |
case -EACCES:
|
1668 |
error_report("Image is read-only");
|
1669 |
break;
|
1670 |
default:
|
1671 |
error_report("Error resizing image (%d)", -ret);
|
1672 |
break;
|
1673 |
} |
1674 |
out:
|
1675 |
if (bs) {
|
1676 |
bdrv_delete(bs); |
1677 |
} |
1678 |
if (ret) {
|
1679 |
return 1; |
1680 |
} |
1681 |
return 0; |
1682 |
} |
1683 |
|
1684 |
static const img_cmd_t img_cmds[] = { |
1685 |
#define DEF(option, callback, arg_string) \
|
1686 |
{ option, callback }, |
1687 |
#include "qemu-img-cmds.h" |
1688 |
#undef DEF
|
1689 |
#undef GEN_DOCS
|
1690 |
{ NULL, NULL, }, |
1691 |
}; |
1692 |
|
1693 |
int main(int argc, char **argv) |
1694 |
{ |
1695 |
const img_cmd_t *cmd;
|
1696 |
const char *cmdname; |
1697 |
|
1698 |
error_set_progname(argv[0]);
|
1699 |
|
1700 |
bdrv_init(); |
1701 |
if (argc < 2) |
1702 |
help(); |
1703 |
cmdname = argv[1];
|
1704 |
argc--; argv++; |
1705 |
|
1706 |
qemu_init_main_loop(); |
1707 |
|
1708 |
/* find the command */
|
1709 |
for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
1710 |
if (!strcmp(cmdname, cmd->name)) {
|
1711 |
return cmd->handler(argc, argv);
|
1712 |
} |
1713 |
} |
1714 |
|
1715 |
/* not found */
|
1716 |
help(); |
1717 |
return 0; |
1718 |
} |