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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 "osdep.h" | |
27 | #include "sysemu.h" | |
28 | #include "block_int.h" | |
29 | #include <stdio.h> | |
30 | ||
31 | #ifdef _WIN32 | |
32 | #include <windows.h> | |
33 | #endif | |
34 | ||
35 | typedef struct img_cmd_t { | |
36 | const char *name; | |
37 | int (*handler)(int argc, char **argv); | |
38 | } img_cmd_t; | |
39 | ||
40 | /* Default to cache=writeback as data integrity is not important for qemu-tcg. */ | |
41 | #define BDRV_O_FLAGS BDRV_O_CACHE_WB | |
42 | ||
43 | static void GCC_FMT_ATTR(1, 2) error(const char *fmt, ...) | |
44 | { | |
45 | va_list ap; | |
46 | va_start(ap, fmt); | |
47 | fprintf(stderr, "qemu-img: "); | |
48 | vfprintf(stderr, fmt, ap); | |
49 | fprintf(stderr, "\n"); | |
50 | va_end(ap); | |
51 | } | |
52 | ||
53 | static void format_print(void *opaque, const char *name) | |
54 | { | |
55 | printf(" %s", name); | |
56 | } | |
57 | ||
58 | /* Please keep in synch with qemu-img.texi */ | |
59 | static void help(void) | |
60 | { | |
61 | const char *help_msg = | |
62 | "qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n" | |
63 | "usage: qemu-img command [command options]\n" | |
64 | "QEMU disk image utility\n" | |
65 | "\n" | |
66 | "Command syntax:\n" | |
67 | #define DEF(option, callback, arg_string) \ | |
68 | " " arg_string "\n" | |
69 | #include "qemu-img-cmds.h" | |
70 | #undef DEF | |
71 | #undef GEN_DOCS | |
72 | "\n" | |
73 | "Command parameters:\n" | |
74 | " 'filename' is a disk image filename\n" | |
75 | " 'fmt' is the disk image format. It is guessed automatically in most cases\n" | |
76 | " 'size' is the disk image size in bytes. Optional suffixes\n" | |
77 | " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n" | |
78 | " and T (terabyte, 1024G) are supported. 'b' is ignored.\n" | |
79 | " 'output_filename' is the destination disk image filename\n" | |
80 | " 'output_fmt' is the destination format\n" | |
81 | " 'options' is a comma separated list of format specific options in a\n" | |
82 | " name=value format. Use -o ? for an overview of the options supported by the\n" | |
83 | " used format\n" | |
84 | " '-c' indicates that target image must be compressed (qcow format only)\n" | |
85 | " '-u' enables unsafe rebasing. It is assumed that old and new backing file\n" | |
86 | " match exactly. The image doesn't need a working backing file before\n" | |
87 | " rebasing in this case (useful for renaming the backing file)\n" | |
88 | " '-h' with or without a command shows this help and lists the supported formats\n" | |
89 | "\n" | |
90 | "Parameters to snapshot subcommand:\n" | |
91 | " 'snapshot' is the name of the snapshot to create, apply or delete\n" | |
92 | " '-a' applies a snapshot (revert disk to saved state)\n" | |
93 | " '-c' creates a snapshot\n" | |
94 | " '-d' deletes a snapshot\n" | |
95 | " '-l' lists all snapshots in the given image\n"; | |
96 | ||
97 | printf("%s\nSupported formats:", help_msg); | |
98 | bdrv_iterate_format(format_print, NULL); | |
99 | printf("\n"); | |
100 | exit(1); | |
101 | } | |
102 | ||
103 | #if defined(WIN32) | |
104 | /* XXX: put correct support for win32 */ | |
105 | static int read_password(char *buf, int buf_size) | |
106 | { | |
107 | int c, i; | |
108 | printf("Password: "); | |
109 | fflush(stdout); | |
110 | i = 0; | |
111 | for(;;) { | |
112 | c = getchar(); | |
113 | if (c == '\n') | |
114 | break; | |
115 | if (i < (buf_size - 1)) | |
116 | buf[i++] = c; | |
117 | } | |
118 | buf[i] = '\0'; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | #else | |
123 | ||
124 | #include <termios.h> | |
125 | ||
126 | static struct termios oldtty; | |
127 | ||
128 | static void term_exit(void) | |
129 | { | |
130 | tcsetattr (0, TCSANOW, &oldtty); | |
131 | } | |
132 | ||
133 | static void term_init(void) | |
134 | { | |
135 | struct termios tty; | |
136 | ||
137 | tcgetattr (0, &tty); | |
138 | oldtty = tty; | |
139 | ||
140 | tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP | |
141 | |INLCR|IGNCR|ICRNL|IXON); | |
142 | tty.c_oflag |= OPOST; | |
143 | tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); | |
144 | tty.c_cflag &= ~(CSIZE|PARENB); | |
145 | tty.c_cflag |= CS8; | |
146 | tty.c_cc[VMIN] = 1; | |
147 | tty.c_cc[VTIME] = 0; | |
148 | ||
149 | tcsetattr (0, TCSANOW, &tty); | |
150 | ||
151 | atexit(term_exit); | |
152 | } | |
153 | ||
154 | static int read_password(char *buf, int buf_size) | |
155 | { | |
156 | uint8_t ch; | |
157 | int i, ret; | |
158 | ||
159 | printf("password: "); | |
160 | fflush(stdout); | |
161 | term_init(); | |
162 | i = 0; | |
163 | for(;;) { | |
164 | ret = read(0, &ch, 1); | |
165 | if (ret == -1) { | |
166 | if (errno == EAGAIN || errno == EINTR) { | |
167 | continue; | |
168 | } else { | |
169 | ret = -1; | |
170 | break; | |
171 | } | |
172 | } else if (ret == 0) { | |
173 | ret = -1; | |
174 | break; | |
175 | } else { | |
176 | if (ch == '\r') { | |
177 | ret = 0; | |
178 | break; | |
179 | } | |
180 | if (i < (buf_size - 1)) | |
181 | buf[i++] = ch; | |
182 | } | |
183 | } | |
184 | term_exit(); | |
185 | buf[i] = '\0'; | |
186 | printf("\n"); | |
187 | return ret; | |
188 | } | |
189 | #endif | |
190 | ||
191 | static int print_block_option_help(const char *filename, const char *fmt) | |
192 | { | |
193 | BlockDriver *drv, *proto_drv; | |
194 | QEMUOptionParameter *create_options = NULL; | |
195 | ||
196 | /* Find driver and parse its options */ | |
197 | drv = bdrv_find_format(fmt); | |
198 | if (!drv) { | |
199 | error("Unknown file format '%s'", fmt); | |
200 | return 1; | |
201 | } | |
202 | ||
203 | proto_drv = bdrv_find_protocol(filename); | |
204 | if (!proto_drv) { | |
205 | error("Unknown protocol '%s'", filename); | |
206 | return 1; | |
207 | } | |
208 | ||
209 | create_options = append_option_parameters(create_options, | |
210 | drv->create_options); | |
211 | create_options = append_option_parameters(create_options, | |
212 | proto_drv->create_options); | |
213 | print_option_help(create_options); | |
214 | free_option_parameters(create_options); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static BlockDriverState *bdrv_new_open(const char *filename, | |
219 | const char *fmt, | |
220 | int flags) | |
221 | { | |
222 | BlockDriverState *bs; | |
223 | BlockDriver *drv; | |
224 | char password[256]; | |
225 | ||
226 | bs = bdrv_new(""); | |
227 | if (!bs) { | |
228 | error("Not enough memory"); | |
229 | goto fail; | |
230 | } | |
231 | if (fmt) { | |
232 | drv = bdrv_find_format(fmt); | |
233 | if (!drv) { | |
234 | error("Unknown file format '%s'", fmt); | |
235 | goto fail; | |
236 | } | |
237 | } else { | |
238 | drv = NULL; | |
239 | } | |
240 | if (bdrv_open(bs, filename, flags, drv) < 0) { | |
241 | error("Could not open '%s'", filename); | |
242 | goto fail; | |
243 | } | |
244 | if (bdrv_is_encrypted(bs)) { | |
245 | printf("Disk image '%s' is encrypted.\n", filename); | |
246 | if (read_password(password, sizeof(password)) < 0) { | |
247 | error("No password given"); | |
248 | goto fail; | |
249 | } | |
250 | if (bdrv_set_key(bs, password) < 0) { | |
251 | error("invalid password"); | |
252 | goto fail; | |
253 | } | |
254 | } | |
255 | return bs; | |
256 | fail: | |
257 | if (bs) { | |
258 | bdrv_delete(bs); | |
259 | } | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, | |
264 | const char *base_filename, | |
265 | const char *base_fmt) | |
266 | { | |
267 | if (base_filename) { | |
268 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) { | |
269 | error("Backing file not supported for file format '%s'", fmt); | |
270 | return -1; | |
271 | } | |
272 | } | |
273 | if (base_fmt) { | |
274 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
275 | error("Backing file format not supported for file format '%s'", fmt); | |
276 | return -1; | |
277 | } | |
278 | } | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int img_create(int argc, char **argv) | |
283 | { | |
284 | int c, ret = 0; | |
285 | uint64_t img_size = -1; | |
286 | const char *fmt = "raw"; | |
287 | const char *base_fmt = NULL; | |
288 | const char *filename; | |
289 | const char *base_filename = NULL; | |
290 | BlockDriver *drv, *proto_drv; | |
291 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
292 | QEMUOptionParameter *backing_fmt = NULL; | |
293 | char *options = NULL; | |
294 | ||
295 | for(;;) { | |
296 | c = getopt(argc, argv, "F:b:f:he6o:"); | |
297 | if (c == -1) { | |
298 | break; | |
299 | } | |
300 | switch(c) { | |
301 | case '?': | |
302 | case 'h': | |
303 | help(); | |
304 | break; | |
305 | case 'F': | |
306 | base_fmt = optarg; | |
307 | break; | |
308 | case 'b': | |
309 | base_filename = optarg; | |
310 | break; | |
311 | case 'f': | |
312 | fmt = optarg; | |
313 | break; | |
314 | case 'e': | |
315 | error("qemu-img: option -e is deprecated, please use \'-o " | |
316 | "encryption\' instead!"); | |
317 | return 1; | |
318 | case '6': | |
319 | error("qemu-img: option -6 is deprecated, please use \'-o " | |
320 | "compat6\' instead!"); | |
321 | return 1; | |
322 | case 'o': | |
323 | options = optarg; | |
324 | break; | |
325 | } | |
326 | } | |
327 | ||
328 | /* Get the filename */ | |
329 | if (optind >= argc) { | |
330 | help(); | |
331 | } | |
332 | filename = argv[optind++]; | |
333 | ||
334 | /* Get image size, if specified */ | |
335 | if (optind < argc) { | |
336 | ssize_t sval; | |
337 | sval = strtosz_suffix(argv[optind++], NULL, STRTOSZ_DEFSUFFIX_B); | |
338 | if (sval < 0) { | |
339 | error("Invalid image size specified! You may use k, M, G or " | |
340 | "T suffixes for "); | |
341 | error("kilobytes, megabytes, gigabytes and terabytes."); | |
342 | ret = -1; | |
343 | goto out; | |
344 | } | |
345 | img_size = (uint64_t)sval; | |
346 | } | |
347 | ||
348 | if (options && !strcmp(options, "?")) { | |
349 | ret = print_block_option_help(filename, fmt); | |
350 | goto out; | |
351 | } | |
352 | ||
353 | /* Find driver and parse its options */ | |
354 | drv = bdrv_find_format(fmt); | |
355 | if (!drv) { | |
356 | error("Unknown file format '%s'", fmt); | |
357 | ret = -1; | |
358 | goto out; | |
359 | } | |
360 | ||
361 | proto_drv = bdrv_find_protocol(filename); | |
362 | if (!proto_drv) { | |
363 | error("Unknown protocol '%s'", filename); | |
364 | ret = -1; | |
365 | goto out; | |
366 | } | |
367 | ||
368 | create_options = append_option_parameters(create_options, | |
369 | drv->create_options); | |
370 | create_options = append_option_parameters(create_options, | |
371 | proto_drv->create_options); | |
372 | ||
373 | /* Create parameter list with default values */ | |
374 | param = parse_option_parameters("", create_options, param); | |
375 | ||
376 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
377 | ||
378 | /* Parse -o options */ | |
379 | if (options) { | |
380 | param = parse_option_parameters(options, create_options, param); | |
381 | if (param == NULL) { | |
382 | error("Invalid options for file format '%s'.", fmt); | |
383 | ret = -1; | |
384 | goto out; | |
385 | } | |
386 | } | |
387 | ||
388 | /* Add old-style options to parameters */ | |
389 | ret = add_old_style_options(fmt, param, base_filename, base_fmt); | |
390 | if (ret < 0) { | |
391 | goto out; | |
392 | } | |
393 | ||
394 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); | |
395 | if (backing_fmt && backing_fmt->value.s) { | |
396 | if (!bdrv_find_format(backing_fmt->value.s)) { | |
397 | error("Unknown backing file format '%s'", | |
398 | backing_fmt->value.s); | |
399 | ret = -1; | |
400 | goto out; | |
401 | } | |
402 | } | |
403 | ||
404 | // The size for the image must always be specified, with one exception: | |
405 | // If we are using a backing file, we can obtain the size from there | |
406 | if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { | |
407 | ||
408 | QEMUOptionParameter *backing_file = | |
409 | get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
410 | ||
411 | if (backing_file && backing_file->value.s) { | |
412 | BlockDriverState *bs; | |
413 | uint64_t size; | |
414 | const char *fmt = NULL; | |
415 | char buf[32]; | |
416 | ||
417 | if (backing_fmt && backing_fmt->value.s) { | |
418 | fmt = backing_fmt->value.s; | |
419 | } | |
420 | ||
421 | bs = bdrv_new_open(backing_file->value.s, fmt, BDRV_O_FLAGS); | |
422 | if (!bs) { | |
423 | ret = -1; | |
424 | goto out; | |
425 | } | |
426 | bdrv_get_geometry(bs, &size); | |
427 | size *= 512; | |
428 | bdrv_delete(bs); | |
429 | ||
430 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
431 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
432 | } else { | |
433 | error("Image creation needs a size parameter"); | |
434 | ret = -1; | |
435 | goto out; | |
436 | } | |
437 | } | |
438 | ||
439 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
440 | print_option_parameters(param); | |
441 | puts(""); | |
442 | ||
443 | ret = bdrv_create(drv, filename, param); | |
444 | ||
445 | if (ret < 0) { | |
446 | if (ret == -ENOTSUP) { | |
447 | error("Formatting or formatting option not supported for file format '%s'", fmt); | |
448 | } else if (ret == -EFBIG) { | |
449 | error("The image size is too large for file format '%s'", fmt); | |
450 | } else { | |
451 | error("%s: error while creating %s: %s", filename, fmt, strerror(-ret)); | |
452 | } | |
453 | } | |
454 | out: | |
455 | free_option_parameters(create_options); | |
456 | free_option_parameters(param); | |
457 | if (ret) { | |
458 | return 1; | |
459 | } | |
460 | return 0; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Checks an image for consistency. Exit codes: | |
465 | * | |
466 | * 0 - Check completed, image is good | |
467 | * 1 - Check not completed because of internal errors | |
468 | * 2 - Check completed, image is corrupted | |
469 | * 3 - Check completed, image has leaked clusters, but is good otherwise | |
470 | */ | |
471 | static int img_check(int argc, char **argv) | |
472 | { | |
473 | int c, ret; | |
474 | const char *filename, *fmt; | |
475 | BlockDriverState *bs; | |
476 | BdrvCheckResult result; | |
477 | ||
478 | fmt = NULL; | |
479 | for(;;) { | |
480 | c = getopt(argc, argv, "f:h"); | |
481 | if (c == -1) { | |
482 | break; | |
483 | } | |
484 | switch(c) { | |
485 | case '?': | |
486 | case 'h': | |
487 | help(); | |
488 | break; | |
489 | case 'f': | |
490 | fmt = optarg; | |
491 | break; | |
492 | } | |
493 | } | |
494 | if (optind >= argc) { | |
495 | help(); | |
496 | } | |
497 | filename = argv[optind++]; | |
498 | ||
499 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); | |
500 | if (!bs) { | |
501 | return 1; | |
502 | } | |
503 | ret = bdrv_check(bs, &result); | |
504 | ||
505 | if (ret == -ENOTSUP) { | |
506 | error("This image format does not support checks"); | |
507 | bdrv_delete(bs); | |
508 | return 1; | |
509 | } | |
510 | ||
511 | if (!(result.corruptions || result.leaks || result.check_errors)) { | |
512 | printf("No errors were found on the image.\n"); | |
513 | } else { | |
514 | if (result.corruptions) { | |
515 | printf("\n%d errors were found on the image.\n" | |
516 | "Data may be corrupted, or further writes to the image " | |
517 | "may corrupt it.\n", | |
518 | result.corruptions); | |
519 | } | |
520 | ||
521 | if (result.leaks) { | |
522 | printf("\n%d leaked clusters were found on the image.\n" | |
523 | "This means waste of disk space, but no harm to data.\n", | |
524 | result.leaks); | |
525 | } | |
526 | ||
527 | if (result.check_errors) { | |
528 | printf("\n%d internal errors have occurred during the check.\n", | |
529 | result.check_errors); | |
530 | } | |
531 | } | |
532 | ||
533 | bdrv_delete(bs); | |
534 | ||
535 | if (ret < 0 || result.check_errors) { | |
536 | printf("\nAn error has occurred during the check: %s\n" | |
537 | "The check is not complete and may have missed error.\n", | |
538 | strerror(-ret)); | |
539 | return 1; | |
540 | } | |
541 | ||
542 | if (result.corruptions) { | |
543 | return 2; | |
544 | } else if (result.leaks) { | |
545 | return 3; | |
546 | } else { | |
547 | return 0; | |
548 | } | |
549 | } | |
550 | ||
551 | static int img_commit(int argc, char **argv) | |
552 | { | |
553 | int c, ret; | |
554 | const char *filename, *fmt; | |
555 | BlockDriverState *bs; | |
556 | ||
557 | fmt = NULL; | |
558 | for(;;) { | |
559 | c = getopt(argc, argv, "f:h"); | |
560 | if (c == -1) { | |
561 | break; | |
562 | } | |
563 | switch(c) { | |
564 | case '?': | |
565 | case 'h': | |
566 | help(); | |
567 | break; | |
568 | case 'f': | |
569 | fmt = optarg; | |
570 | break; | |
571 | } | |
572 | } | |
573 | if (optind >= argc) { | |
574 | help(); | |
575 | } | |
576 | filename = argv[optind++]; | |
577 | ||
578 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); | |
579 | if (!bs) { | |
580 | return 1; | |
581 | } | |
582 | ret = bdrv_commit(bs); | |
583 | switch(ret) { | |
584 | case 0: | |
585 | printf("Image committed.\n"); | |
586 | break; | |
587 | case -ENOENT: | |
588 | error("No disk inserted"); | |
589 | break; | |
590 | case -EACCES: | |
591 | error("Image is read-only"); | |
592 | break; | |
593 | case -ENOTSUP: | |
594 | error("Image is already committed"); | |
595 | break; | |
596 | default: | |
597 | error("Error while committing image"); | |
598 | break; | |
599 | } | |
600 | ||
601 | bdrv_delete(bs); | |
602 | if (ret) { | |
603 | return 1; | |
604 | } | |
605 | return 0; | |
606 | } | |
607 | ||
608 | static int is_not_zero(const uint8_t *sector, int len) | |
609 | { | |
610 | int i; | |
611 | len >>= 2; | |
612 | for(i = 0;i < len; i++) { | |
613 | if (((uint32_t *)sector)[i] != 0) | |
614 | return 1; | |
615 | } | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Returns true iff the first sector pointed to by 'buf' contains at least | |
621 | * a non-NUL byte. | |
622 | * | |
623 | * 'pnum' is set to the number of sectors (including and immediately following | |
624 | * the first one) that are known to be in the same allocated/unallocated state. | |
625 | */ | |
626 | static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) | |
627 | { | |
628 | int v, i; | |
629 | ||
630 | if (n <= 0) { | |
631 | *pnum = 0; | |
632 | return 0; | |
633 | } | |
634 | v = is_not_zero(buf, 512); | |
635 | for(i = 1; i < n; i++) { | |
636 | buf += 512; | |
637 | if (v != is_not_zero(buf, 512)) | |
638 | break; | |
639 | } | |
640 | *pnum = i; | |
641 | return v; | |
642 | } | |
643 | ||
644 | /* | |
645 | * Compares two buffers sector by sector. Returns 0 if the first sector of both | |
646 | * buffers matches, non-zero otherwise. | |
647 | * | |
648 | * pnum is set to the number of sectors (including and immediately following | |
649 | * the first one) that are known to have the same comparison result | |
650 | */ | |
651 | static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, | |
652 | int *pnum) | |
653 | { | |
654 | int res, i; | |
655 | ||
656 | if (n <= 0) { | |
657 | *pnum = 0; | |
658 | return 0; | |
659 | } | |
660 | ||
661 | res = !!memcmp(buf1, buf2, 512); | |
662 | for(i = 1; i < n; i++) { | |
663 | buf1 += 512; | |
664 | buf2 += 512; | |
665 | ||
666 | if (!!memcmp(buf1, buf2, 512) != res) { | |
667 | break; | |
668 | } | |
669 | } | |
670 | ||
671 | *pnum = i; | |
672 | return res; | |
673 | } | |
674 | ||
675 | #define IO_BUF_SIZE (2 * 1024 * 1024) | |
676 | ||
677 | static int img_convert(int argc, char **argv) | |
678 | { | |
679 | int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, cluster_sectors; | |
680 | const char *fmt, *out_fmt, *out_baseimg, *out_filename; | |
681 | BlockDriver *drv, *proto_drv; | |
682 | BlockDriverState **bs = NULL, *out_bs = NULL; | |
683 | int64_t total_sectors, nb_sectors, sector_num, bs_offset; | |
684 | uint64_t bs_sectors; | |
685 | uint8_t * buf = NULL; | |
686 | const uint8_t *buf1; | |
687 | BlockDriverInfo bdi; | |
688 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
689 | QEMUOptionParameter *out_baseimg_param; | |
690 | char *options = NULL; | |
691 | const char *snapshot_name = NULL; | |
692 | ||
693 | fmt = NULL; | |
694 | out_fmt = "raw"; | |
695 | out_baseimg = NULL; | |
696 | compress = 0; | |
697 | for(;;) { | |
698 | c = getopt(argc, argv, "f:O:B:s:hce6o:"); | |
699 | if (c == -1) { | |
700 | break; | |
701 | } | |
702 | switch(c) { | |
703 | case '?': | |
704 | case 'h': | |
705 | help(); | |
706 | break; | |
707 | case 'f': | |
708 | fmt = optarg; | |
709 | break; | |
710 | case 'O': | |
711 | out_fmt = optarg; | |
712 | break; | |
713 | case 'B': | |
714 | out_baseimg = optarg; | |
715 | break; | |
716 | case 'c': | |
717 | compress = 1; | |
718 | break; | |
719 | case 'e': | |
720 | error("qemu-img: option -e is deprecated, please use \'-o " | |
721 | "encryption\' instead!"); | |
722 | return 1; | |
723 | case '6': | |
724 | error("qemu-img: option -6 is deprecated, please use \'-o " | |
725 | "compat6\' instead!"); | |
726 | return 1; | |
727 | case 'o': | |
728 | options = optarg; | |
729 | break; | |
730 | case 's': | |
731 | snapshot_name = optarg; | |
732 | break; | |
733 | } | |
734 | } | |
735 | ||
736 | bs_n = argc - optind - 1; | |
737 | if (bs_n < 1) { | |
738 | help(); | |
739 | } | |
740 | ||
741 | out_filename = argv[argc - 1]; | |
742 | ||
743 | if (options && !strcmp(options, "?")) { | |
744 | ret = print_block_option_help(out_filename, out_fmt); | |
745 | goto out; | |
746 | } | |
747 | ||
748 | if (bs_n > 1 && out_baseimg) { | |
749 | error("-B makes no sense when concatenating multiple input images"); | |
750 | ret = -1; | |
751 | goto out; | |
752 | } | |
753 | ||
754 | bs = qemu_mallocz(bs_n * sizeof(BlockDriverState *)); | |
755 | ||
756 | total_sectors = 0; | |
757 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
758 | bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); | |
759 | if (!bs[bs_i]) { | |
760 | error("Could not open '%s'", argv[optind + bs_i]); | |
761 | ret = -1; | |
762 | goto out; | |
763 | } | |
764 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
765 | total_sectors += bs_sectors; | |
766 | } | |
767 | ||
768 | if (snapshot_name != NULL) { | |
769 | if (bs_n > 1) { | |
770 | error("No support for concatenating multiple snapshot\n"); | |
771 | ret = -1; | |
772 | goto out; | |
773 | } | |
774 | if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) { | |
775 | error("Failed to load snapshot\n"); | |
776 | ret = -1; | |
777 | goto out; | |
778 | } | |
779 | } | |
780 | ||
781 | /* Find driver and parse its options */ | |
782 | drv = bdrv_find_format(out_fmt); | |
783 | if (!drv) { | |
784 | error("Unknown file format '%s'", out_fmt); | |
785 | ret = -1; | |
786 | goto out; | |
787 | } | |
788 | ||
789 | proto_drv = bdrv_find_protocol(out_filename); | |
790 | if (!proto_drv) { | |
791 | error("Unknown protocol '%s'", out_filename); | |
792 | ret = -1; | |
793 | goto out; | |
794 | } | |
795 | ||
796 | create_options = append_option_parameters(create_options, | |
797 | drv->create_options); | |
798 | create_options = append_option_parameters(create_options, | |
799 | proto_drv->create_options); | |
800 | ||
801 | if (options) { | |
802 | param = parse_option_parameters(options, create_options, param); | |
803 | if (param == NULL) { | |
804 | error("Invalid options for file format '%s'.", out_fmt); | |
805 | ret = -1; | |
806 | goto out; | |
807 | } | |
808 | } else { | |
809 | param = parse_option_parameters("", create_options, param); | |
810 | } | |
811 | ||
812 | set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512); | |
813 | ret = add_old_style_options(out_fmt, param, out_baseimg, NULL); | |
814 | if (ret < 0) { | |
815 | goto out; | |
816 | } | |
817 | ||
818 | /* Get backing file name if -o backing_file was used */ | |
819 | out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
820 | if (out_baseimg_param) { | |
821 | out_baseimg = out_baseimg_param->value.s; | |
822 | } | |
823 | ||
824 | /* Check if compression is supported */ | |
825 | if (compress) { | |
826 | QEMUOptionParameter *encryption = | |
827 | get_option_parameter(param, BLOCK_OPT_ENCRYPT); | |
828 | ||
829 | if (!drv->bdrv_write_compressed) { | |
830 | error("Compression not supported for this file format"); | |
831 | ret = -1; | |
832 | goto out; | |
833 | } | |
834 | ||
835 | if (encryption && encryption->value.n) { | |
836 | error("Compression and encryption not supported at the same time"); | |
837 | ret = -1; | |
838 | goto out; | |
839 | } | |
840 | } | |
841 | ||
842 | /* Create the new image */ | |
843 | ret = bdrv_create(drv, out_filename, param); | |
844 | if (ret < 0) { | |
845 | if (ret == -ENOTSUP) { | |
846 | error("Formatting not supported for file format '%s'", out_fmt); | |
847 | } else if (ret == -EFBIG) { | |
848 | error("The image size is too large for file format '%s'", out_fmt); | |
849 | } else { | |
850 | error("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret)); | |
851 | } | |
852 | goto out; | |
853 | } | |
854 | ||
855 | out_bs = bdrv_new_open(out_filename, out_fmt, | |
856 | BDRV_O_FLAGS | BDRV_O_RDWR | BDRV_O_NO_FLUSH); | |
857 | if (!out_bs) { | |
858 | ret = -1; | |
859 | goto out; | |
860 | } | |
861 | ||
862 | bs_i = 0; | |
863 | bs_offset = 0; | |
864 | bdrv_get_geometry(bs[0], &bs_sectors); | |
865 | buf = qemu_malloc(IO_BUF_SIZE); | |
866 | ||
867 | if (compress) { | |
868 | ret = bdrv_get_info(out_bs, &bdi); | |
869 | if (ret < 0) { | |
870 | error("could not get block driver info"); | |
871 | goto out; | |
872 | } | |
873 | cluster_size = bdi.cluster_size; | |
874 | if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { | |
875 | error("invalid cluster size"); | |
876 | ret = -1; | |
877 | goto out; | |
878 | } | |
879 | cluster_sectors = cluster_size >> 9; | |
880 | sector_num = 0; | |
881 | for(;;) { | |
882 | int64_t bs_num; | |
883 | int remainder; | |
884 | uint8_t *buf2; | |
885 | ||
886 | nb_sectors = total_sectors - sector_num; | |
887 | if (nb_sectors <= 0) | |
888 | break; | |
889 | if (nb_sectors >= cluster_sectors) | |
890 | n = cluster_sectors; | |
891 | else | |
892 | n = nb_sectors; | |
893 | ||
894 | bs_num = sector_num - bs_offset; | |
895 | assert (bs_num >= 0); | |
896 | remainder = n; | |
897 | buf2 = buf; | |
898 | while (remainder > 0) { | |
899 | int nlow; | |
900 | while (bs_num == bs_sectors) { | |
901 | bs_i++; | |
902 | assert (bs_i < bs_n); | |
903 | bs_offset += bs_sectors; | |
904 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
905 | bs_num = 0; | |
906 | /* printf("changing part: sector_num=%" PRId64 ", " | |
907 | "bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64 | |
908 | "\n", sector_num, bs_i, bs_offset, bs_sectors); */ | |
909 | } | |
910 | assert (bs_num < bs_sectors); | |
911 | ||
912 | nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; | |
913 | ||
914 | ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); | |
915 | if (ret < 0) { | |
916 | error("error while reading"); | |
917 | goto out; | |
918 | } | |
919 | ||
920 | buf2 += nlow * 512; | |
921 | bs_num += nlow; | |
922 | ||
923 | remainder -= nlow; | |
924 | } | |
925 | assert (remainder == 0); | |
926 | ||
927 | if (n < cluster_sectors) { | |
928 | memset(buf + n * 512, 0, cluster_size - n * 512); | |
929 | } | |
930 | if (is_not_zero(buf, cluster_size)) { | |
931 | ret = bdrv_write_compressed(out_bs, sector_num, buf, | |
932 | cluster_sectors); | |
933 | if (ret != 0) { | |
934 | error("error while compressing sector %" PRId64, | |
935 | sector_num); | |
936 | goto out; | |
937 | } | |
938 | } | |
939 | sector_num += n; | |
940 | } | |
941 | /* signal EOF to align */ | |
942 | bdrv_write_compressed(out_bs, 0, NULL, 0); | |
943 | } else { | |
944 | int has_zero_init = bdrv_has_zero_init(out_bs); | |
945 | ||
946 | sector_num = 0; // total number of sectors converted so far | |
947 | for(;;) { | |
948 | nb_sectors = total_sectors - sector_num; | |
949 | if (nb_sectors <= 0) { | |
950 | break; | |
951 | } | |
952 | if (nb_sectors >= (IO_BUF_SIZE / 512)) { | |
953 | n = (IO_BUF_SIZE / 512); | |
954 | } else { | |
955 | n = nb_sectors; | |
956 | } | |
957 | ||
958 | while (sector_num - bs_offset >= bs_sectors) { | |
959 | bs_i ++; | |
960 | assert (bs_i < bs_n); | |
961 | bs_offset += bs_sectors; | |
962 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
963 | /* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, " | |
964 | "bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n", | |
965 | sector_num, bs_i, bs_offset, bs_sectors); */ | |
966 | } | |
967 | ||
968 | if (n > bs_offset + bs_sectors - sector_num) { | |
969 | n = bs_offset + bs_sectors - sector_num; | |
970 | } | |
971 | ||
972 | if (has_zero_init) { | |
973 | /* If the output image is being created as a copy on write image, | |
974 | assume that sectors which are unallocated in the input image | |
975 | are present in both the output's and input's base images (no | |
976 | need to copy them). */ | |
977 | if (out_baseimg) { | |
978 | if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, | |
979 | n, &n1)) { | |
980 | sector_num += n1; | |
981 | continue; | |
982 | } | |
983 | /* The next 'n1' sectors are allocated in the input image. Copy | |
984 | only those as they may be followed by unallocated sectors. */ | |
985 | n = n1; | |
986 | } | |
987 | } else { | |
988 | n1 = n; | |
989 | } | |
990 | ||
991 | ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); | |
992 | if (ret < 0) { | |
993 | error("error while reading"); | |
994 | goto out; | |
995 | } | |
996 | /* NOTE: at the same time we convert, we do not write zero | |
997 | sectors to have a chance to compress the image. Ideally, we | |
998 | should add a specific call to have the info to go faster */ | |
999 | buf1 = buf; | |
1000 | while (n > 0) { | |
1001 | /* If the output image is being created as a copy on write image, | |
1002 | copy all sectors even the ones containing only NUL bytes, | |
1003 | because they may differ from the sectors in the base image. | |
1004 | ||
1005 | If the output is to a host device, we also write out | |
1006 | sectors that are entirely 0, since whatever data was | |
1007 | already there is garbage, not 0s. */ | |
1008 | if (!has_zero_init || out_baseimg || | |
1009 | is_allocated_sectors(buf1, n, &n1)) { | |
1010 | ret = bdrv_write(out_bs, sector_num, buf1, n1); | |
1011 | if (ret < 0) { | |
1012 | error("error while writing"); | |
1013 | goto out; | |
1014 | } | |
1015 | } | |
1016 | sector_num += n1; | |
1017 | n -= n1; | |
1018 | buf1 += n1 * 512; | |
1019 | } | |
1020 | } | |
1021 | } | |
1022 | out: | |
1023 | free_option_parameters(create_options); | |
1024 | free_option_parameters(param); | |
1025 | qemu_free(buf); | |
1026 | if (out_bs) { | |
1027 | bdrv_delete(out_bs); | |
1028 | } | |
1029 | if (bs) { | |
1030 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
1031 | if (bs[bs_i]) { | |
1032 | bdrv_delete(bs[bs_i]); | |
1033 | } | |
1034 | } | |
1035 | qemu_free(bs); | |
1036 | } | |
1037 | if (ret) { | |
1038 | return 1; | |
1039 | } | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | #ifdef _WIN32 | |
1044 | static int64_t get_allocated_file_size(const char *filename) | |
1045 | { | |
1046 | typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); | |
1047 | get_compressed_t get_compressed; | |
1048 | struct _stati64 st; | |
1049 | ||
1050 | /* WinNT support GetCompressedFileSize to determine allocate size */ | |
1051 | get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); | |
1052 | if (get_compressed) { | |
1053 | DWORD high, low; | |
1054 | low = get_compressed(filename, &high); | |
1055 | if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) | |
1056 | return (((int64_t) high) << 32) + low; | |
1057 | } | |
1058 | ||
1059 | if (_stati64(filename, &st) < 0) | |
1060 | return -1; | |
1061 | return st.st_size; | |
1062 | } | |
1063 | #else | |
1064 | static int64_t get_allocated_file_size(const char *filename) | |
1065 | { | |
1066 | struct stat st; | |
1067 | if (stat(filename, &st) < 0) | |
1068 | return -1; | |
1069 | return (int64_t)st.st_blocks * 512; | |
1070 | } | |
1071 | #endif | |
1072 | ||
1073 | static void dump_snapshots(BlockDriverState *bs) | |
1074 | { | |
1075 | QEMUSnapshotInfo *sn_tab, *sn; | |
1076 | int nb_sns, i; | |
1077 | char buf[256]; | |
1078 | ||
1079 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
1080 | if (nb_sns <= 0) | |
1081 | return; | |
1082 | printf("Snapshot list:\n"); | |
1083 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); | |
1084 | for(i = 0; i < nb_sns; i++) { | |
1085 | sn = &sn_tab[i]; | |
1086 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); | |
1087 | } | |
1088 | qemu_free(sn_tab); | |
1089 | } | |
1090 | ||
1091 | static int img_info(int argc, char **argv) | |
1092 | { | |
1093 | int c; | |
1094 | const char *filename, *fmt; | |
1095 | BlockDriverState *bs; | |
1096 | char fmt_name[128], size_buf[128], dsize_buf[128]; | |
1097 | uint64_t total_sectors; | |
1098 | int64_t allocated_size; | |
1099 | char backing_filename[1024]; | |
1100 | char backing_filename2[1024]; | |
1101 | BlockDriverInfo bdi; | |
1102 | ||
1103 | fmt = NULL; | |
1104 | for(;;) { | |
1105 | c = getopt(argc, argv, "f:h"); | |
1106 | if (c == -1) { | |
1107 | break; | |
1108 | } | |
1109 | switch(c) { | |
1110 | case '?': | |
1111 | case 'h': | |
1112 | help(); | |
1113 | break; | |
1114 | case 'f': | |
1115 | fmt = optarg; | |
1116 | break; | |
1117 | } | |
1118 | } | |
1119 | if (optind >= argc) { | |
1120 | help(); | |
1121 | } | |
1122 | filename = argv[optind++]; | |
1123 | ||
1124 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); | |
1125 | if (!bs) { | |
1126 | return 1; | |
1127 | } | |
1128 | bdrv_get_format(bs, fmt_name, sizeof(fmt_name)); | |
1129 | bdrv_get_geometry(bs, &total_sectors); | |
1130 | get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); | |
1131 | allocated_size = get_allocated_file_size(filename); | |
1132 | if (allocated_size < 0) { | |
1133 | snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); | |
1134 | } else { | |
1135 | get_human_readable_size(dsize_buf, sizeof(dsize_buf), | |
1136 | allocated_size); | |
1137 | } | |
1138 | printf("image: %s\n" | |
1139 | "file format: %s\n" | |
1140 | "virtual size: %s (%" PRId64 " bytes)\n" | |
1141 | "disk size: %s\n", | |
1142 | filename, fmt_name, size_buf, | |
1143 | (total_sectors * 512), | |
1144 | dsize_buf); | |
1145 | if (bdrv_is_encrypted(bs)) { | |
1146 | printf("encrypted: yes\n"); | |
1147 | } | |
1148 | if (bdrv_get_info(bs, &bdi) >= 0) { | |
1149 | if (bdi.cluster_size != 0) { | |
1150 | printf("cluster_size: %d\n", bdi.cluster_size); | |
1151 | } | |
1152 | } | |
1153 | bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename)); | |
1154 | if (backing_filename[0] != '\0') { | |
1155 | path_combine(backing_filename2, sizeof(backing_filename2), | |
1156 | filename, backing_filename); | |
1157 | printf("backing file: %s (actual path: %s)\n", | |
1158 | backing_filename, | |
1159 | backing_filename2); | |
1160 | } | |
1161 | dump_snapshots(bs); | |
1162 | bdrv_delete(bs); | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | #define SNAPSHOT_LIST 1 | |
1167 | #define SNAPSHOT_CREATE 2 | |
1168 | #define SNAPSHOT_APPLY 3 | |
1169 | #define SNAPSHOT_DELETE 4 | |
1170 | ||
1171 | static int img_snapshot(int argc, char **argv) | |
1172 | { | |
1173 | BlockDriverState *bs; | |
1174 | QEMUSnapshotInfo sn; | |
1175 | char *filename, *snapshot_name = NULL; | |
1176 | int c, ret = 0, bdrv_oflags; | |
1177 | int action = 0; | |
1178 | qemu_timeval tv; | |
1179 | ||
1180 | bdrv_oflags = BDRV_O_RDWR; | |
1181 | /* Parse commandline parameters */ | |
1182 | for(;;) { | |
1183 | c = getopt(argc, argv, "la:c:d:h"); | |
1184 | if (c == -1) { | |
1185 | break; | |
1186 | } | |
1187 | switch(c) { | |
1188 | case '?': | |
1189 | case 'h': | |
1190 | help(); | |
1191 | return 0; | |
1192 | case 'l': | |
1193 | if (action) { | |
1194 | help(); | |
1195 | return 0; | |
1196 | } | |
1197 | action = SNAPSHOT_LIST; | |
1198 | bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */ | |
1199 | break; | |
1200 | case 'a': | |
1201 | if (action) { | |
1202 | help(); | |
1203 | return 0; | |
1204 | } | |
1205 | action = SNAPSHOT_APPLY; | |
1206 | snapshot_name = optarg; | |
1207 | break; | |
1208 | case 'c': | |
1209 | if (action) { | |
1210 | help(); | |
1211 | return 0; | |
1212 | } | |
1213 | action = SNAPSHOT_CREATE; | |
1214 | snapshot_name = optarg; | |
1215 | break; | |
1216 | case 'd': | |
1217 | if (action) { | |
1218 | help(); | |
1219 | return 0; | |
1220 | } | |
1221 | action = SNAPSHOT_DELETE; | |
1222 | snapshot_name = optarg; | |
1223 | break; | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | if (optind >= argc) { | |
1228 | help(); | |
1229 | } | |
1230 | filename = argv[optind++]; | |
1231 | ||
1232 | /* Open the image */ | |
1233 | bs = bdrv_new_open(filename, NULL, bdrv_oflags); | |
1234 | if (!bs) { | |
1235 | return 1; | |
1236 | } | |
1237 | ||
1238 | /* Perform the requested action */ | |
1239 | switch(action) { | |
1240 | case SNAPSHOT_LIST: | |
1241 | dump_snapshots(bs); | |
1242 | break; | |
1243 | ||
1244 | case SNAPSHOT_CREATE: | |
1245 | memset(&sn, 0, sizeof(sn)); | |
1246 | pstrcpy(sn.name, sizeof(sn.name), snapshot_name); | |
1247 | ||
1248 | qemu_gettimeofday(&tv); | |
1249 | sn.date_sec = tv.tv_sec; | |
1250 | sn.date_nsec = tv.tv_usec * 1000; | |
1251 | ||
1252 | ret = bdrv_snapshot_create(bs, &sn); | |
1253 | if (ret) { | |
1254 | error("Could not create snapshot '%s': %d (%s)", | |
1255 | snapshot_name, ret, strerror(-ret)); | |
1256 | } | |
1257 | break; | |
1258 | ||
1259 | case SNAPSHOT_APPLY: | |
1260 | ret = bdrv_snapshot_goto(bs, snapshot_name); | |
1261 | if (ret) { | |
1262 | error("Could not apply snapshot '%s': %d (%s)", | |
1263 | snapshot_name, ret, strerror(-ret)); | |
1264 | } | |
1265 | break; | |
1266 | ||
1267 | case SNAPSHOT_DELETE: | |
1268 | ret = bdrv_snapshot_delete(bs, snapshot_name); | |
1269 | if (ret) { | |
1270 | error("Could not delete snapshot '%s': %d (%s)", | |
1271 | snapshot_name, ret, strerror(-ret)); | |
1272 | } | |
1273 | break; | |
1274 | } | |
1275 | ||
1276 | /* Cleanup */ | |
1277 | bdrv_delete(bs); | |
1278 | if (ret) { | |
1279 | return 1; | |
1280 | } | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | static int img_rebase(int argc, char **argv) | |
1285 | { | |
1286 | BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; | |
1287 | BlockDriver *old_backing_drv, *new_backing_drv; | |
1288 | char *filename; | |
1289 | const char *fmt, *out_basefmt, *out_baseimg; | |
1290 | int c, flags, ret; | |
1291 | int unsafe = 0; | |
1292 | ||
1293 | /* Parse commandline parameters */ | |
1294 | fmt = NULL; | |
1295 | out_baseimg = NULL; | |
1296 | out_basefmt = NULL; | |
1297 | ||
1298 | for(;;) { | |
1299 | c = getopt(argc, argv, "uhf:F:b:"); | |
1300 | if (c == -1) { | |
1301 | break; | |
1302 | } | |
1303 | switch(c) { | |
1304 | case '?': | |
1305 | case 'h': | |
1306 | help(); | |
1307 | return 0; | |
1308 | case 'f': | |
1309 | fmt = optarg; | |
1310 | break; | |
1311 | case 'F': | |
1312 | out_basefmt = optarg; | |
1313 | break; | |
1314 | case 'b': | |
1315 | out_baseimg = optarg; | |
1316 | break; | |
1317 | case 'u': | |
1318 | unsafe = 1; | |
1319 | break; | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | if ((optind >= argc) || !out_baseimg) { | |
1324 | help(); | |
1325 | } | |
1326 | filename = argv[optind++]; | |
1327 | ||
1328 | /* | |
1329 | * Open the images. | |
1330 | * | |
1331 | * Ignore the old backing file for unsafe rebase in case we want to correct | |
1332 | * the reference to a renamed or moved backing file. | |
1333 | */ | |
1334 | flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0); | |
1335 | bs = bdrv_new_open(filename, fmt, flags); | |
1336 | if (!bs) { | |
1337 | return 1; | |
1338 | } | |
1339 | ||
1340 | /* Find the right drivers for the backing files */ | |
1341 | old_backing_drv = NULL; | |
1342 | new_backing_drv = NULL; | |
1343 | ||
1344 | if (!unsafe && bs->backing_format[0] != '\0') { | |
1345 | old_backing_drv = bdrv_find_format(bs->backing_format); | |
1346 | if (old_backing_drv == NULL) { | |
1347 | error("Invalid format name: '%s'", bs->backing_format); | |
1348 | ret = -1; | |
1349 | goto out; | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | if (out_basefmt != NULL) { | |
1354 | new_backing_drv = bdrv_find_format(out_basefmt); | |
1355 | if (new_backing_drv == NULL) { | |
1356 | error("Invalid format name: '%s'", out_basefmt); | |
1357 | ret = -1; | |
1358 | goto out; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | /* For safe rebasing we need to compare old and new backing file */ | |
1363 | if (unsafe) { | |
1364 | /* Make the compiler happy */ | |
1365 | bs_old_backing = NULL; | |
1366 | bs_new_backing = NULL; | |
1367 | } else { | |
1368 | char backing_name[1024]; | |
1369 | ||
1370 | bs_old_backing = bdrv_new("old_backing"); | |
1371 | bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); | |
1372 | ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, | |
1373 | old_backing_drv); | |
1374 | if (ret) { | |
1375 | error("Could not open old backing file '%s'", backing_name); | |
1376 | goto out; | |
1377 | } | |
1378 | ||
1379 | bs_new_backing = bdrv_new("new_backing"); | |
1380 | ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS, | |
1381 | new_backing_drv); | |
1382 | if (ret) { | |
1383 | error("Could not open new backing file '%s'", out_baseimg); | |
1384 | goto out; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | /* | |
1389 | * Check each unallocated cluster in the COW file. If it is unallocated, | |
1390 | * accesses go to the backing file. We must therefore compare this cluster | |
1391 | * in the old and new backing file, and if they differ we need to copy it | |
1392 | * from the old backing file into the COW file. | |
1393 | * | |
1394 | * If qemu-img crashes during this step, no harm is done. The content of | |
1395 | * the image is the same as the original one at any time. | |
1396 | */ | |
1397 | if (!unsafe) { | |
1398 | uint64_t num_sectors; | |
1399 | uint64_t sector; | |
1400 | int n; | |
1401 | uint8_t * buf_old; | |
1402 | uint8_t * buf_new; | |
1403 | ||
1404 | buf_old = qemu_malloc(IO_BUF_SIZE); | |
1405 | buf_new = qemu_malloc(IO_BUF_SIZE); | |
1406 | ||
1407 | bdrv_get_geometry(bs, &num_sectors); | |
1408 | ||
1409 | for (sector = 0; sector < num_sectors; sector += n) { | |
1410 | ||
1411 | /* How many sectors can we handle with the next read? */ | |
1412 | if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { | |
1413 | n = (IO_BUF_SIZE / 512); | |
1414 | } else { | |
1415 | n = num_sectors - sector; | |
1416 | } | |
1417 | ||
1418 | /* If the cluster is allocated, we don't need to take action */ | |
1419 | ret = bdrv_is_allocated(bs, sector, n, &n); | |
1420 | if (ret) { | |
1421 | continue; | |
1422 | } | |
1423 | ||
1424 | /* Read old and new backing file */ | |
1425 | ret = bdrv_read(bs_old_backing, sector, buf_old, n); | |
1426 | if (ret < 0) { | |
1427 | error("error while reading from old backing file"); | |
1428 | goto out; | |
1429 | } | |
1430 | ret = bdrv_read(bs_new_backing, sector, buf_new, n); | |
1431 | if (ret < 0) { | |
1432 | error("error while reading from new backing file"); | |
1433 | goto out; | |
1434 | } | |
1435 | ||
1436 | /* If they differ, we need to write to the COW file */ | |
1437 | uint64_t written = 0; | |
1438 | ||
1439 | while (written < n) { | |
1440 | int pnum; | |
1441 | ||
1442 | if (compare_sectors(buf_old + written * 512, | |
1443 | buf_new + written * 512, n - written, &pnum)) | |
1444 | { | |
1445 | ret = bdrv_write(bs, sector + written, | |
1446 | buf_old + written * 512, pnum); | |
1447 | if (ret < 0) { | |
1448 | error("Error while writing to COW image: %s", | |
1449 | strerror(-ret)); | |
1450 | goto out; | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | written += pnum; | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | qemu_free(buf_old); | |
1459 | qemu_free(buf_new); | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * Change the backing file. All clusters that are different from the old | |
1464 | * backing file are overwritten in the COW file now, so the visible content | |
1465 | * doesn't change when we switch the backing file. | |
1466 | */ | |
1467 | ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); | |
1468 | if (ret == -ENOSPC) { | |
1469 | error("Could not change the backing file to '%s': No space left in " | |
1470 | "the file header", out_baseimg); | |
1471 | } else if (ret < 0) { | |
1472 | error("Could not change the backing file to '%s': %s", | |
1473 | out_baseimg, strerror(-ret)); | |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * TODO At this point it is possible to check if any clusters that are | |
1478 | * allocated in the COW file are the same in the backing file. If so, they | |
1479 | * could be dropped from the COW file. Don't do this before switching the | |
1480 | * backing file, in case of a crash this would lead to corruption. | |
1481 | */ | |
1482 | out: | |
1483 | /* Cleanup */ | |
1484 | if (!unsafe) { | |
1485 | bdrv_delete(bs_old_backing); | |
1486 | bdrv_delete(bs_new_backing); | |
1487 | } | |
1488 | ||
1489 | bdrv_delete(bs); | |
1490 | if (ret) { | |
1491 | return 1; | |
1492 | } | |
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | static int img_resize(int argc, char **argv) | |
1497 | { | |
1498 | int c, ret, relative; | |
1499 | const char *filename, *fmt, *size; | |
1500 | int64_t n, total_size; | |
1501 | BlockDriverState *bs = NULL; | |
1502 | QEMUOptionParameter *param; | |
1503 | QEMUOptionParameter resize_options[] = { | |
1504 | { | |
1505 | .name = BLOCK_OPT_SIZE, | |
1506 | .type = OPT_SIZE, | |
1507 | .help = "Virtual disk size" | |
1508 | }, | |
1509 | { NULL } | |
1510 | }; | |
1511 | ||
1512 | fmt = NULL; | |
1513 | for(;;) { | |
1514 | c = getopt(argc, argv, "f:h"); | |
1515 | if (c == -1) { | |
1516 | break; | |
1517 | } | |
1518 | switch(c) { | |
1519 | case '?': | |
1520 | case 'h': | |
1521 | help(); | |
1522 | break; | |
1523 | case 'f': | |
1524 | fmt = optarg; | |
1525 | break; | |
1526 | } | |
1527 | } | |
1528 | if (optind + 1 >= argc) { | |
1529 | help(); | |
1530 | } | |
1531 | filename = argv[optind++]; | |
1532 | size = argv[optind++]; | |
1533 | ||
1534 | /* Choose grow, shrink, or absolute resize mode */ | |
1535 | switch (size[0]) { | |
1536 | case '+': | |
1537 | relative = 1; | |
1538 | size++; | |
1539 | break; | |
1540 | case '-': | |
1541 | relative = -1; | |
1542 | size++; | |
1543 | break; | |
1544 | default: | |
1545 | relative = 0; | |
1546 | break; | |
1547 | } | |
1548 | ||
1549 | /* Parse size */ | |
1550 | param = parse_option_parameters("", resize_options, NULL); | |
1551 | if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) { | |
1552 | /* Error message already printed when size parsing fails */ | |
1553 | ret = -1; | |
1554 | goto out; | |
1555 | } | |
1556 | n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n; | |
1557 | free_option_parameters(param); | |
1558 | ||
1559 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); | |
1560 | if (!bs) { | |
1561 | ret = -1; | |
1562 | goto out; | |
1563 | } | |
1564 | ||
1565 | if (relative) { | |
1566 | total_size = bdrv_getlength(bs) + n * relative; | |
1567 | } else { | |
1568 | total_size = n; | |
1569 | } | |
1570 | if (total_size <= 0) { | |
1571 | error("New image size must be positive"); | |
1572 | ret = -1; | |
1573 | goto out; | |
1574 | } | |
1575 | ||
1576 | ret = bdrv_truncate(bs, total_size); | |
1577 | switch (ret) { | |
1578 | case 0: | |
1579 | printf("Image resized.\n"); | |
1580 | break; | |
1581 | case -ENOTSUP: | |
1582 | error("This image format does not support resize"); | |
1583 | break; | |
1584 | case -EACCES: | |
1585 | error("Image is read-only"); | |
1586 | break; | |
1587 | default: | |
1588 | error("Error resizing image (%d)", -ret); | |
1589 | break; | |
1590 | } | |
1591 | out: | |
1592 | if (bs) { | |
1593 | bdrv_delete(bs); | |
1594 | } | |
1595 | if (ret) { | |
1596 | return 1; | |
1597 | } | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static const img_cmd_t img_cmds[] = { | |
1602 | #define DEF(option, callback, arg_string) \ | |
1603 | { option, callback }, | |
1604 | #include "qemu-img-cmds.h" | |
1605 | #undef DEF | |
1606 | #undef GEN_DOCS | |
1607 | { NULL, NULL, }, | |
1608 | }; | |
1609 | ||
1610 | int main(int argc, char **argv) | |
1611 | { | |
1612 | const img_cmd_t *cmd; | |
1613 | const char *cmdname; | |
1614 | ||
1615 | bdrv_init(); | |
1616 | if (argc < 2) | |
1617 | help(); | |
1618 | cmdname = argv[1]; | |
1619 | argc--; argv++; | |
1620 | ||
1621 | /* find the command */ | |
1622 | for(cmd = img_cmds; cmd->name != NULL; cmd++) { | |
1623 | if (!strcmp(cmdname, cmd->name)) { | |
1624 | return cmd->handler(argc, argv); | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | /* not found */ | |
1629 | help(); | |
1630 | return 0; | |
1631 | } |