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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 "block_int.h" | |
28 | #include <stdio.h> | |
29 | ||
30 | #ifdef _WIN32 | |
31 | #include <windows.h> | |
32 | #endif | |
33 | ||
34 | typedef struct img_cmd_t { | |
35 | const char *name; | |
36 | int (*handler)(int argc, char **argv); | |
37 | } img_cmd_t; | |
38 | ||
39 | /* Default to cache=writeback as data integrity is not important for qemu-tcg. */ | |
40 | #define BDRV_O_FLAGS BDRV_O_CACHE_WB | |
41 | ||
42 | static void error(const char *fmt, ...) | |
43 | { | |
44 | va_list ap; | |
45 | va_start(ap, fmt); | |
46 | fprintf(stderr, "qemu-img: "); | |
47 | vfprintf(stderr, fmt, ap); | |
48 | fprintf(stderr, "\n"); | |
49 | va_end(ap); | |
50 | } | |
51 | ||
52 | static void format_print(void *opaque, const char *name) | |
53 | { | |
54 | printf(" %s", name); | |
55 | } | |
56 | ||
57 | /* Please keep in synch with qemu-img.texi */ | |
58 | static void help(void) | |
59 | { | |
60 | const char *help_msg = | |
61 | "qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n" | |
62 | "usage: qemu-img command [command options]\n" | |
63 | "QEMU disk image utility\n" | |
64 | "\n" | |
65 | "Command syntax:\n" | |
66 | #define DEF(option, callback, arg_string) \ | |
67 | " " arg_string "\n" | |
68 | #include "qemu-img-cmds.h" | |
69 | #undef DEF | |
70 | #undef GEN_DOCS | |
71 | "\n" | |
72 | "Command parameters:\n" | |
73 | " 'filename' is a disk image filename\n" | |
74 | " 'fmt' is the disk image format. It is guessed automatically in most cases\n" | |
75 | " 'size' is the disk image size in bytes. Optional suffixes\n" | |
76 | " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n" | |
77 | " and T (terabyte, 1024G) are supported. 'b' is ignored.\n" | |
78 | " 'output_filename' is the destination disk image filename\n" | |
79 | " 'output_fmt' is the destination format\n" | |
80 | " 'options' is a comma separated list of format specific options in a\n" | |
81 | " name=value format. Use -o ? for an overview of the options supported by the\n" | |
82 | " used format\n" | |
83 | " '-c' indicates that target image must be compressed (qcow format only)\n" | |
84 | " '-u' enables unsafe rebasing. It is assumed that old and new backing file\n" | |
85 | " match exactly. The image doesn't need a working backing file before\n" | |
86 | " rebasing in this case (useful for renaming the backing file)\n" | |
87 | " '-h' with or without a command shows this help and lists the supported formats\n" | |
88 | "\n" | |
89 | "Parameters to snapshot subcommand:\n" | |
90 | " 'snapshot' is the name of the snapshot to create, apply or delete\n" | |
91 | " '-a' applies a snapshot (revert disk to saved state)\n" | |
92 | " '-c' creates a snapshot\n" | |
93 | " '-d' deletes a snapshot\n" | |
94 | " '-l' lists all snapshots in the given image\n"; | |
95 | ||
96 | printf("%s\nSupported formats:", help_msg); | |
97 | bdrv_iterate_format(format_print, NULL); | |
98 | printf("\n"); | |
99 | exit(1); | |
100 | } | |
101 | ||
102 | #if defined(WIN32) | |
103 | /* XXX: put correct support for win32 */ | |
104 | static int read_password(char *buf, int buf_size) | |
105 | { | |
106 | int c, i; | |
107 | printf("Password: "); | |
108 | fflush(stdout); | |
109 | i = 0; | |
110 | for(;;) { | |
111 | c = getchar(); | |
112 | if (c == '\n') | |
113 | break; | |
114 | if (i < (buf_size - 1)) | |
115 | buf[i++] = c; | |
116 | } | |
117 | buf[i] = '\0'; | |
118 | return 0; | |
119 | } | |
120 | ||
121 | #else | |
122 | ||
123 | #include <termios.h> | |
124 | ||
125 | static struct termios oldtty; | |
126 | ||
127 | static void term_exit(void) | |
128 | { | |
129 | tcsetattr (0, TCSANOW, &oldtty); | |
130 | } | |
131 | ||
132 | static void term_init(void) | |
133 | { | |
134 | struct termios tty; | |
135 | ||
136 | tcgetattr (0, &tty); | |
137 | oldtty = tty; | |
138 | ||
139 | tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP | |
140 | |INLCR|IGNCR|ICRNL|IXON); | |
141 | tty.c_oflag |= OPOST; | |
142 | tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); | |
143 | tty.c_cflag &= ~(CSIZE|PARENB); | |
144 | tty.c_cflag |= CS8; | |
145 | tty.c_cc[VMIN] = 1; | |
146 | tty.c_cc[VTIME] = 0; | |
147 | ||
148 | tcsetattr (0, TCSANOW, &tty); | |
149 | ||
150 | atexit(term_exit); | |
151 | } | |
152 | ||
153 | static int read_password(char *buf, int buf_size) | |
154 | { | |
155 | uint8_t ch; | |
156 | int i, ret; | |
157 | ||
158 | printf("password: "); | |
159 | fflush(stdout); | |
160 | term_init(); | |
161 | i = 0; | |
162 | for(;;) { | |
163 | ret = read(0, &ch, 1); | |
164 | if (ret == -1) { | |
165 | if (errno == EAGAIN || errno == EINTR) { | |
166 | continue; | |
167 | } else { | |
168 | ret = -1; | |
169 | break; | |
170 | } | |
171 | } else if (ret == 0) { | |
172 | ret = -1; | |
173 | break; | |
174 | } else { | |
175 | if (ch == '\r') { | |
176 | ret = 0; | |
177 | break; | |
178 | } | |
179 | if (i < (buf_size - 1)) | |
180 | buf[i++] = ch; | |
181 | } | |
182 | } | |
183 | term_exit(); | |
184 | buf[i] = '\0'; | |
185 | printf("\n"); | |
186 | return ret; | |
187 | } | |
188 | #endif | |
189 | ||
190 | static BlockDriverState *bdrv_new_open(const char *filename, | |
191 | const char *fmt, | |
192 | int flags) | |
193 | { | |
194 | BlockDriverState *bs; | |
195 | BlockDriver *drv; | |
196 | char password[256]; | |
197 | ||
198 | bs = bdrv_new(""); | |
199 | if (!bs) { | |
200 | error("Not enough memory"); | |
201 | goto fail; | |
202 | } | |
203 | if (fmt) { | |
204 | drv = bdrv_find_format(fmt); | |
205 | if (!drv) { | |
206 | error("Unknown file format '%s'", fmt); | |
207 | goto fail; | |
208 | } | |
209 | } else { | |
210 | drv = NULL; | |
211 | } | |
212 | if (bdrv_open(bs, filename, flags, drv) < 0) { | |
213 | error("Could not open '%s'", filename); | |
214 | goto fail; | |
215 | } | |
216 | if (bdrv_is_encrypted(bs)) { | |
217 | printf("Disk image '%s' is encrypted.\n", filename); | |
218 | if (read_password(password, sizeof(password)) < 0) { | |
219 | error("No password given"); | |
220 | goto fail; | |
221 | } | |
222 | if (bdrv_set_key(bs, password) < 0) { | |
223 | error("invalid password"); | |
224 | goto fail; | |
225 | } | |
226 | } | |
227 | return bs; | |
228 | fail: | |
229 | if (bs) { | |
230 | bdrv_delete(bs); | |
231 | } | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, | |
236 | int flags, const char *base_filename, const char *base_fmt) | |
237 | { | |
238 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
239 | if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) { | |
240 | error("Encryption not supported for file format '%s'", fmt); | |
241 | return -1; | |
242 | } | |
243 | } | |
244 | if (flags & BLOCK_FLAG_COMPAT6) { | |
245 | if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) { | |
246 | error("VMDK version 6 not supported for file format '%s'", fmt); | |
247 | return -1; | |
248 | } | |
249 | } | |
250 | ||
251 | if (base_filename) { | |
252 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) { | |
253 | error("Backing file not supported for file format '%s'", fmt); | |
254 | return -1; | |
255 | } | |
256 | } | |
257 | if (base_fmt) { | |
258 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
259 | error("Backing file format not supported for file format '%s'", fmt); | |
260 | return -1; | |
261 | } | |
262 | } | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static int img_create(int argc, char **argv) | |
267 | { | |
268 | int c, ret = 0, flags; | |
269 | const char *fmt = "raw"; | |
270 | const char *base_fmt = NULL; | |
271 | const char *filename; | |
272 | const char *base_filename = NULL; | |
273 | BlockDriver *drv, *proto_drv; | |
274 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
275 | char *options = NULL; | |
276 | ||
277 | flags = 0; | |
278 | for(;;) { | |
279 | c = getopt(argc, argv, "F:b:f:he6o:"); | |
280 | if (c == -1) | |
281 | break; | |
282 | switch(c) { | |
283 | case 'h': | |
284 | help(); | |
285 | break; | |
286 | case 'F': | |
287 | base_fmt = optarg; | |
288 | break; | |
289 | case 'b': | |
290 | base_filename = optarg; | |
291 | break; | |
292 | case 'f': | |
293 | fmt = optarg; | |
294 | break; | |
295 | case 'e': | |
296 | flags |= BLOCK_FLAG_ENCRYPT; | |
297 | break; | |
298 | case '6': | |
299 | flags |= BLOCK_FLAG_COMPAT6; | |
300 | break; | |
301 | case 'o': | |
302 | options = optarg; | |
303 | break; | |
304 | } | |
305 | } | |
306 | ||
307 | /* Get the filename */ | |
308 | if (optind >= argc) | |
309 | help(); | |
310 | filename = argv[optind++]; | |
311 | ||
312 | /* Find driver and parse its options */ | |
313 | drv = bdrv_find_format(fmt); | |
314 | if (!drv) { | |
315 | error("Unknown file format '%s'", fmt); | |
316 | return 1; | |
317 | } | |
318 | ||
319 | proto_drv = bdrv_find_protocol(filename); | |
320 | if (!proto_drv) { | |
321 | error("Unknown protocol '%s'", filename); | |
322 | return 1; | |
323 | } | |
324 | ||
325 | create_options = append_option_parameters(create_options, | |
326 | drv->create_options); | |
327 | create_options = append_option_parameters(create_options, | |
328 | proto_drv->create_options); | |
329 | ||
330 | if (options && !strcmp(options, "?")) { | |
331 | print_option_help(create_options); | |
332 | goto out; | |
333 | } | |
334 | ||
335 | /* Create parameter list with default values */ | |
336 | param = parse_option_parameters("", create_options, param); | |
337 | set_option_parameter_int(param, BLOCK_OPT_SIZE, -1); | |
338 | ||
339 | /* Parse -o options */ | |
340 | if (options) { | |
341 | param = parse_option_parameters(options, create_options, param); | |
342 | if (param == NULL) { | |
343 | error("Invalid options for file format '%s'.", fmt); | |
344 | ret = -1; | |
345 | goto out; | |
346 | } | |
347 | } | |
348 | ||
349 | /* Add size to parameters */ | |
350 | if (optind < argc) { | |
351 | set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]); | |
352 | } | |
353 | ||
354 | /* Add old-style options to parameters */ | |
355 | ret = add_old_style_options(fmt, param, flags, base_filename, base_fmt); | |
356 | if (ret < 0) { | |
357 | goto out; | |
358 | } | |
359 | ||
360 | // The size for the image must always be specified, with one exception: | |
361 | // If we are using a backing file, we can obtain the size from there | |
362 | if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { | |
363 | ||
364 | QEMUOptionParameter *backing_file = | |
365 | get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
366 | QEMUOptionParameter *backing_fmt = | |
367 | get_option_parameter(param, BLOCK_OPT_BACKING_FMT); | |
368 | ||
369 | if (backing_file && backing_file->value.s) { | |
370 | BlockDriverState *bs; | |
371 | uint64_t size; | |
372 | const char *fmt = NULL; | |
373 | char buf[32]; | |
374 | ||
375 | if (backing_fmt && backing_fmt->value.s) { | |
376 | if (bdrv_find_format(backing_fmt->value.s)) { | |
377 | fmt = backing_fmt->value.s; | |
378 | } else { | |
379 | error("Unknown backing file format '%s'", | |
380 | backing_fmt->value.s); | |
381 | ret = -1; | |
382 | goto out; | |
383 | } | |
384 | } | |
385 | ||
386 | bs = bdrv_new_open(backing_file->value.s, fmt, BDRV_O_FLAGS); | |
387 | if (!bs) { | |
388 | ret = -1; | |
389 | goto out; | |
390 | } | |
391 | bdrv_get_geometry(bs, &size); | |
392 | size *= 512; | |
393 | bdrv_delete(bs); | |
394 | ||
395 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
396 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
397 | } else { | |
398 | error("Image creation needs a size parameter"); | |
399 | ret = -1; | |
400 | goto out; | |
401 | } | |
402 | } | |
403 | ||
404 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
405 | print_option_parameters(param); | |
406 | puts(""); | |
407 | ||
408 | ret = bdrv_create(drv, filename, param); | |
409 | free_option_parameters(create_options); | |
410 | free_option_parameters(param); | |
411 | ||
412 | if (ret < 0) { | |
413 | if (ret == -ENOTSUP) { | |
414 | error("Formatting or formatting option not supported for file format '%s'", fmt); | |
415 | } else if (ret == -EFBIG) { | |
416 | error("The image size is too large for file format '%s'", fmt); | |
417 | } else { | |
418 | error("%s: error while creating %s: %s", filename, fmt, strerror(-ret)); | |
419 | } | |
420 | } | |
421 | out: | |
422 | if (ret) { | |
423 | return 1; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Checks an image for consistency. Exit codes: | |
430 | * | |
431 | * 0 - Check completed, image is good | |
432 | * 1 - Check not completed because of internal errors | |
433 | * 2 - Check completed, image is corrupted | |
434 | * 3 - Check completed, image has leaked clusters, but is good otherwise | |
435 | */ | |
436 | static int img_check(int argc, char **argv) | |
437 | { | |
438 | int c, ret; | |
439 | const char *filename, *fmt; | |
440 | BlockDriverState *bs; | |
441 | BdrvCheckResult result; | |
442 | ||
443 | fmt = NULL; | |
444 | for(;;) { | |
445 | c = getopt(argc, argv, "f:h"); | |
446 | if (c == -1) | |
447 | break; | |
448 | switch(c) { | |
449 | case 'h': | |
450 | help(); | |
451 | break; | |
452 | case 'f': | |
453 | fmt = optarg; | |
454 | break; | |
455 | } | |
456 | } | |
457 | if (optind >= argc) | |
458 | help(); | |
459 | filename = argv[optind++]; | |
460 | ||
461 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); | |
462 | if (!bs) { | |
463 | return 1; | |
464 | } | |
465 | ret = bdrv_check(bs, &result); | |
466 | ||
467 | if (ret == -ENOTSUP) { | |
468 | error("This image format does not support checks"); | |
469 | bdrv_delete(bs); | |
470 | return 1; | |
471 | } | |
472 | ||
473 | if (!(result.corruptions || result.leaks || result.check_errors)) { | |
474 | printf("No errors were found on the image.\n"); | |
475 | } else { | |
476 | if (result.corruptions) { | |
477 | printf("\n%d errors were found on the image.\n" | |
478 | "Data may be corrupted, or further writes to the image " | |
479 | "may corrupt it.\n", | |
480 | result.corruptions); | |
481 | } | |
482 | ||
483 | if (result.leaks) { | |
484 | printf("\n%d leaked clusters were found on the image.\n" | |
485 | "This means waste of disk space, but no harm to data.\n", | |
486 | result.leaks); | |
487 | } | |
488 | ||
489 | if (result.check_errors) { | |
490 | printf("\n%d internal errors have occurred during the check.\n", | |
491 | result.check_errors); | |
492 | } | |
493 | } | |
494 | ||
495 | bdrv_delete(bs); | |
496 | ||
497 | if (ret < 0 || result.check_errors) { | |
498 | printf("\nAn error has occurred during the check: %s\n" | |
499 | "The check is not complete and may have missed error.\n", | |
500 | strerror(-ret)); | |
501 | return 1; | |
502 | } | |
503 | ||
504 | if (result.corruptions) { | |
505 | return 2; | |
506 | } else if (result.leaks) { | |
507 | return 3; | |
508 | } else { | |
509 | return 0; | |
510 | } | |
511 | } | |
512 | ||
513 | static int img_commit(int argc, char **argv) | |
514 | { | |
515 | int c, ret; | |
516 | const char *filename, *fmt; | |
517 | BlockDriverState *bs; | |
518 | ||
519 | fmt = NULL; | |
520 | for(;;) { | |
521 | c = getopt(argc, argv, "f:h"); | |
522 | if (c == -1) | |
523 | break; | |
524 | switch(c) { | |
525 | case 'h': | |
526 | help(); | |
527 | break; | |
528 | case 'f': | |
529 | fmt = optarg; | |
530 | break; | |
531 | } | |
532 | } | |
533 | if (optind >= argc) | |
534 | help(); | |
535 | filename = argv[optind++]; | |
536 | ||
537 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); | |
538 | if (!bs) { | |
539 | return 1; | |
540 | } | |
541 | ret = bdrv_commit(bs); | |
542 | switch(ret) { | |
543 | case 0: | |
544 | printf("Image committed.\n"); | |
545 | break; | |
546 | case -ENOENT: | |
547 | error("No disk inserted"); | |
548 | break; | |
549 | case -EACCES: | |
550 | error("Image is read-only"); | |
551 | break; | |
552 | case -ENOTSUP: | |
553 | error("Image is already committed"); | |
554 | break; | |
555 | default: | |
556 | error("Error while committing image"); | |
557 | break; | |
558 | } | |
559 | ||
560 | bdrv_delete(bs); | |
561 | if (ret) { | |
562 | return 1; | |
563 | } | |
564 | return 0; | |
565 | } | |
566 | ||
567 | static int is_not_zero(const uint8_t *sector, int len) | |
568 | { | |
569 | int i; | |
570 | len >>= 2; | |
571 | for(i = 0;i < len; i++) { | |
572 | if (((uint32_t *)sector)[i] != 0) | |
573 | return 1; | |
574 | } | |
575 | return 0; | |
576 | } | |
577 | ||
578 | /* | |
579 | * Returns true iff the first sector pointed to by 'buf' contains at least | |
580 | * a non-NUL byte. | |
581 | * | |
582 | * 'pnum' is set to the number of sectors (including and immediately following | |
583 | * the first one) that are known to be in the same allocated/unallocated state. | |
584 | */ | |
585 | static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) | |
586 | { | |
587 | int v, i; | |
588 | ||
589 | if (n <= 0) { | |
590 | *pnum = 0; | |
591 | return 0; | |
592 | } | |
593 | v = is_not_zero(buf, 512); | |
594 | for(i = 1; i < n; i++) { | |
595 | buf += 512; | |
596 | if (v != is_not_zero(buf, 512)) | |
597 | break; | |
598 | } | |
599 | *pnum = i; | |
600 | return v; | |
601 | } | |
602 | ||
603 | /* | |
604 | * Compares two buffers sector by sector. Returns 0 if the first sector of both | |
605 | * buffers matches, non-zero otherwise. | |
606 | * | |
607 | * pnum is set to the number of sectors (including and immediately following | |
608 | * the first one) that are known to have the same comparison result | |
609 | */ | |
610 | static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, | |
611 | int *pnum) | |
612 | { | |
613 | int res, i; | |
614 | ||
615 | if (n <= 0) { | |
616 | *pnum = 0; | |
617 | return 0; | |
618 | } | |
619 | ||
620 | res = !!memcmp(buf1, buf2, 512); | |
621 | for(i = 1; i < n; i++) { | |
622 | buf1 += 512; | |
623 | buf2 += 512; | |
624 | ||
625 | if (!!memcmp(buf1, buf2, 512) != res) { | |
626 | break; | |
627 | } | |
628 | } | |
629 | ||
630 | *pnum = i; | |
631 | return res; | |
632 | } | |
633 | ||
634 | #define IO_BUF_SIZE (2 * 1024 * 1024) | |
635 | ||
636 | static int img_convert(int argc, char **argv) | |
637 | { | |
638 | int c, ret = 0, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors; | |
639 | const char *fmt, *out_fmt, *out_baseimg, *out_filename; | |
640 | BlockDriver *drv, *proto_drv; | |
641 | BlockDriverState **bs = NULL, *out_bs = NULL; | |
642 | int64_t total_sectors, nb_sectors, sector_num, bs_offset; | |
643 | uint64_t bs_sectors; | |
644 | uint8_t * buf = NULL; | |
645 | const uint8_t *buf1; | |
646 | BlockDriverInfo bdi; | |
647 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
648 | char *options = NULL; | |
649 | ||
650 | fmt = NULL; | |
651 | out_fmt = "raw"; | |
652 | out_baseimg = NULL; | |
653 | flags = 0; | |
654 | for(;;) { | |
655 | c = getopt(argc, argv, "f:O:B:hce6o:"); | |
656 | if (c == -1) | |
657 | break; | |
658 | switch(c) { | |
659 | case 'h': | |
660 | help(); | |
661 | break; | |
662 | case 'f': | |
663 | fmt = optarg; | |
664 | break; | |
665 | case 'O': | |
666 | out_fmt = optarg; | |
667 | break; | |
668 | case 'B': | |
669 | out_baseimg = optarg; | |
670 | break; | |
671 | case 'c': | |
672 | flags |= BLOCK_FLAG_COMPRESS; | |
673 | break; | |
674 | case 'e': | |
675 | flags |= BLOCK_FLAG_ENCRYPT; | |
676 | break; | |
677 | case '6': | |
678 | flags |= BLOCK_FLAG_COMPAT6; | |
679 | break; | |
680 | case 'o': | |
681 | options = optarg; | |
682 | break; | |
683 | } | |
684 | } | |
685 | ||
686 | bs_n = argc - optind - 1; | |
687 | if (bs_n < 1) help(); | |
688 | ||
689 | out_filename = argv[argc - 1]; | |
690 | ||
691 | if (bs_n > 1 && out_baseimg) { | |
692 | error("-B makes no sense when concatenating multiple input images"); | |
693 | return 1; | |
694 | } | |
695 | ||
696 | bs = calloc(bs_n, sizeof(BlockDriverState *)); | |
697 | if (!bs) { | |
698 | error("Out of memory"); | |
699 | return 1; | |
700 | } | |
701 | ||
702 | total_sectors = 0; | |
703 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
704 | bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); | |
705 | if (!bs[bs_i]) { | |
706 | error("Could not open '%s'", argv[optind + bs_i]); | |
707 | ret = -1; | |
708 | goto out; | |
709 | } | |
710 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
711 | total_sectors += bs_sectors; | |
712 | } | |
713 | ||
714 | /* Find driver and parse its options */ | |
715 | drv = bdrv_find_format(out_fmt); | |
716 | if (!drv) { | |
717 | error("Unknown file format '%s'", out_fmt); | |
718 | ret = -1; | |
719 | goto out; | |
720 | } | |
721 | ||
722 | proto_drv = bdrv_find_protocol(out_filename); | |
723 | if (!proto_drv) { | |
724 | error("Unknown protocol '%s'", out_filename); | |
725 | ret = -1; | |
726 | goto out; | |
727 | } | |
728 | ||
729 | create_options = append_option_parameters(create_options, | |
730 | drv->create_options); | |
731 | create_options = append_option_parameters(create_options, | |
732 | proto_drv->create_options); | |
733 | if (options && !strcmp(options, "?")) { | |
734 | print_option_help(create_options); | |
735 | goto out; | |
736 | } | |
737 | ||
738 | if (options) { | |
739 | param = parse_option_parameters(options, create_options, param); | |
740 | if (param == NULL) { | |
741 | error("Invalid options for file format '%s'.", out_fmt); | |
742 | ret = -1; | |
743 | goto out; | |
744 | } | |
745 | } else { | |
746 | param = parse_option_parameters("", create_options, param); | |
747 | } | |
748 | ||
749 | set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512); | |
750 | ret = add_old_style_options(out_fmt, param, flags, out_baseimg, NULL); | |
751 | if (ret < 0) { | |
752 | goto out; | |
753 | } | |
754 | ||
755 | /* Check if compression is supported */ | |
756 | if (flags & BLOCK_FLAG_COMPRESS) { | |
757 | QEMUOptionParameter *encryption = | |
758 | get_option_parameter(param, BLOCK_OPT_ENCRYPT); | |
759 | ||
760 | if (!drv->bdrv_write_compressed) { | |
761 | error("Compression not supported for this file format"); | |
762 | ret = -1; | |
763 | goto out; | |
764 | } | |
765 | ||
766 | if (encryption && encryption->value.n) { | |
767 | error("Compression and encryption not supported at the same time"); | |
768 | ret = -1; | |
769 | goto out; | |
770 | } | |
771 | } | |
772 | ||
773 | /* Create the new image */ | |
774 | ret = bdrv_create(drv, out_filename, param); | |
775 | if (ret < 0) { | |
776 | if (ret == -ENOTSUP) { | |
777 | error("Formatting not supported for file format '%s'", out_fmt); | |
778 | } else if (ret == -EFBIG) { | |
779 | error("The image size is too large for file format '%s'", out_fmt); | |
780 | } else { | |
781 | error("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret)); | |
782 | } | |
783 | goto out; | |
784 | } | |
785 | ||
786 | out_bs = bdrv_new_open(out_filename, out_fmt, BDRV_O_FLAGS | BDRV_O_RDWR); | |
787 | if (!out_bs) { | |
788 | ret = -1; | |
789 | goto out; | |
790 | } | |
791 | ||
792 | bs_i = 0; | |
793 | bs_offset = 0; | |
794 | bdrv_get_geometry(bs[0], &bs_sectors); | |
795 | buf = qemu_malloc(IO_BUF_SIZE); | |
796 | ||
797 | if (flags & BLOCK_FLAG_COMPRESS) { | |
798 | ret = bdrv_get_info(out_bs, &bdi); | |
799 | if (ret < 0) { | |
800 | error("could not get block driver info"); | |
801 | goto out; | |
802 | } | |
803 | cluster_size = bdi.cluster_size; | |
804 | if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { | |
805 | error("invalid cluster size"); | |
806 | ret = -1; | |
807 | goto out; | |
808 | } | |
809 | cluster_sectors = cluster_size >> 9; | |
810 | sector_num = 0; | |
811 | for(;;) { | |
812 | int64_t bs_num; | |
813 | int remainder; | |
814 | uint8_t *buf2; | |
815 | ||
816 | nb_sectors = total_sectors - sector_num; | |
817 | if (nb_sectors <= 0) | |
818 | break; | |
819 | if (nb_sectors >= cluster_sectors) | |
820 | n = cluster_sectors; | |
821 | else | |
822 | n = nb_sectors; | |
823 | ||
824 | bs_num = sector_num - bs_offset; | |
825 | assert (bs_num >= 0); | |
826 | remainder = n; | |
827 | buf2 = buf; | |
828 | while (remainder > 0) { | |
829 | int nlow; | |
830 | while (bs_num == bs_sectors) { | |
831 | bs_i++; | |
832 | assert (bs_i < bs_n); | |
833 | bs_offset += bs_sectors; | |
834 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
835 | bs_num = 0; | |
836 | /* printf("changing part: sector_num=%" PRId64 ", " | |
837 | "bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64 | |
838 | "\n", sector_num, bs_i, bs_offset, bs_sectors); */ | |
839 | } | |
840 | assert (bs_num < bs_sectors); | |
841 | ||
842 | nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; | |
843 | ||
844 | ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); | |
845 | if (ret < 0) { | |
846 | error("error while reading"); | |
847 | goto out; | |
848 | } | |
849 | ||
850 | buf2 += nlow * 512; | |
851 | bs_num += nlow; | |
852 | ||
853 | remainder -= nlow; | |
854 | } | |
855 | assert (remainder == 0); | |
856 | ||
857 | if (n < cluster_sectors) | |
858 | memset(buf + n * 512, 0, cluster_size - n * 512); | |
859 | if (is_not_zero(buf, cluster_size)) { | |
860 | ret = bdrv_write_compressed(out_bs, sector_num, buf, | |
861 | cluster_sectors); | |
862 | if (ret != 0) { | |
863 | error("error while compressing sector %" PRId64, | |
864 | sector_num); | |
865 | goto out; | |
866 | } | |
867 | } | |
868 | sector_num += n; | |
869 | } | |
870 | /* signal EOF to align */ | |
871 | bdrv_write_compressed(out_bs, 0, NULL, 0); | |
872 | } else { | |
873 | int has_zero_init = bdrv_has_zero_init(out_bs); | |
874 | ||
875 | sector_num = 0; // total number of sectors converted so far | |
876 | for(;;) { | |
877 | nb_sectors = total_sectors - sector_num; | |
878 | if (nb_sectors <= 0) | |
879 | break; | |
880 | if (nb_sectors >= (IO_BUF_SIZE / 512)) | |
881 | n = (IO_BUF_SIZE / 512); | |
882 | else | |
883 | n = nb_sectors; | |
884 | ||
885 | while (sector_num - bs_offset >= bs_sectors) { | |
886 | bs_i ++; | |
887 | assert (bs_i < bs_n); | |
888 | bs_offset += bs_sectors; | |
889 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
890 | /* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, " | |
891 | "bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n", | |
892 | sector_num, bs_i, bs_offset, bs_sectors); */ | |
893 | } | |
894 | ||
895 | if (n > bs_offset + bs_sectors - sector_num) | |
896 | n = bs_offset + bs_sectors - sector_num; | |
897 | ||
898 | if (has_zero_init) { | |
899 | /* If the output image is being created as a copy on write image, | |
900 | assume that sectors which are unallocated in the input image | |
901 | are present in both the output's and input's base images (no | |
902 | need to copy them). */ | |
903 | if (out_baseimg) { | |
904 | if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, | |
905 | n, &n1)) { | |
906 | sector_num += n1; | |
907 | continue; | |
908 | } | |
909 | /* The next 'n1' sectors are allocated in the input image. Copy | |
910 | only those as they may be followed by unallocated sectors. */ | |
911 | n = n1; | |
912 | } | |
913 | } else { | |
914 | n1 = n; | |
915 | } | |
916 | ||
917 | ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); | |
918 | if (ret < 0) { | |
919 | error("error while reading"); | |
920 | goto out; | |
921 | } | |
922 | /* NOTE: at the same time we convert, we do not write zero | |
923 | sectors to have a chance to compress the image. Ideally, we | |
924 | should add a specific call to have the info to go faster */ | |
925 | buf1 = buf; | |
926 | while (n > 0) { | |
927 | /* If the output image is being created as a copy on write image, | |
928 | copy all sectors even the ones containing only NUL bytes, | |
929 | because they may differ from the sectors in the base image. | |
930 | ||
931 | If the output is to a host device, we also write out | |
932 | sectors that are entirely 0, since whatever data was | |
933 | already there is garbage, not 0s. */ | |
934 | if (!has_zero_init || out_baseimg || | |
935 | is_allocated_sectors(buf1, n, &n1)) { | |
936 | ret = bdrv_write(out_bs, sector_num, buf1, n1); | |
937 | if (ret < 0) { | |
938 | error("error while writing"); | |
939 | goto out; | |
940 | } | |
941 | } | |
942 | sector_num += n1; | |
943 | n -= n1; | |
944 | buf1 += n1 * 512; | |
945 | } | |
946 | } | |
947 | } | |
948 | out: | |
949 | free_option_parameters(create_options); | |
950 | free_option_parameters(param); | |
951 | qemu_free(buf); | |
952 | if (out_bs) { | |
953 | bdrv_delete(out_bs); | |
954 | } | |
955 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
956 | if (bs[bs_i]) { | |
957 | bdrv_delete(bs[bs_i]); | |
958 | } | |
959 | } | |
960 | free(bs); | |
961 | if (ret) { | |
962 | return 1; | |
963 | } | |
964 | return 0; | |
965 | } | |
966 | ||
967 | #ifdef _WIN32 | |
968 | static int64_t get_allocated_file_size(const char *filename) | |
969 | { | |
970 | typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); | |
971 | get_compressed_t get_compressed; | |
972 | struct _stati64 st; | |
973 | ||
974 | /* WinNT support GetCompressedFileSize to determine allocate size */ | |
975 | get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); | |
976 | if (get_compressed) { | |
977 | DWORD high, low; | |
978 | low = get_compressed(filename, &high); | |
979 | if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) | |
980 | return (((int64_t) high) << 32) + low; | |
981 | } | |
982 | ||
983 | if (_stati64(filename, &st) < 0) | |
984 | return -1; | |
985 | return st.st_size; | |
986 | } | |
987 | #else | |
988 | static int64_t get_allocated_file_size(const char *filename) | |
989 | { | |
990 | struct stat st; | |
991 | if (stat(filename, &st) < 0) | |
992 | return -1; | |
993 | return (int64_t)st.st_blocks * 512; | |
994 | } | |
995 | #endif | |
996 | ||
997 | static void dump_snapshots(BlockDriverState *bs) | |
998 | { | |
999 | QEMUSnapshotInfo *sn_tab, *sn; | |
1000 | int nb_sns, i; | |
1001 | char buf[256]; | |
1002 | ||
1003 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
1004 | if (nb_sns <= 0) | |
1005 | return; | |
1006 | printf("Snapshot list:\n"); | |
1007 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); | |
1008 | for(i = 0; i < nb_sns; i++) { | |
1009 | sn = &sn_tab[i]; | |
1010 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); | |
1011 | } | |
1012 | qemu_free(sn_tab); | |
1013 | } | |
1014 | ||
1015 | static int img_info(int argc, char **argv) | |
1016 | { | |
1017 | int c; | |
1018 | const char *filename, *fmt; | |
1019 | BlockDriverState *bs; | |
1020 | char fmt_name[128], size_buf[128], dsize_buf[128]; | |
1021 | uint64_t total_sectors; | |
1022 | int64_t allocated_size; | |
1023 | char backing_filename[1024]; | |
1024 | char backing_filename2[1024]; | |
1025 | BlockDriverInfo bdi; | |
1026 | ||
1027 | fmt = NULL; | |
1028 | for(;;) { | |
1029 | c = getopt(argc, argv, "f:h"); | |
1030 | if (c == -1) | |
1031 | break; | |
1032 | switch(c) { | |
1033 | case 'h': | |
1034 | help(); | |
1035 | break; | |
1036 | case 'f': | |
1037 | fmt = optarg; | |
1038 | break; | |
1039 | } | |
1040 | } | |
1041 | if (optind >= argc) | |
1042 | help(); | |
1043 | filename = argv[optind++]; | |
1044 | ||
1045 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); | |
1046 | if (!bs) { | |
1047 | return 1; | |
1048 | } | |
1049 | bdrv_get_format(bs, fmt_name, sizeof(fmt_name)); | |
1050 | bdrv_get_geometry(bs, &total_sectors); | |
1051 | get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); | |
1052 | allocated_size = get_allocated_file_size(filename); | |
1053 | if (allocated_size < 0) | |
1054 | snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); | |
1055 | else | |
1056 | get_human_readable_size(dsize_buf, sizeof(dsize_buf), | |
1057 | allocated_size); | |
1058 | printf("image: %s\n" | |
1059 | "file format: %s\n" | |
1060 | "virtual size: %s (%" PRId64 " bytes)\n" | |
1061 | "disk size: %s\n", | |
1062 | filename, fmt_name, size_buf, | |
1063 | (total_sectors * 512), | |
1064 | dsize_buf); | |
1065 | if (bdrv_is_encrypted(bs)) | |
1066 | printf("encrypted: yes\n"); | |
1067 | if (bdrv_get_info(bs, &bdi) >= 0) { | |
1068 | if (bdi.cluster_size != 0) | |
1069 | printf("cluster_size: %d\n", bdi.cluster_size); | |
1070 | } | |
1071 | bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename)); | |
1072 | if (backing_filename[0] != '\0') { | |
1073 | path_combine(backing_filename2, sizeof(backing_filename2), | |
1074 | filename, backing_filename); | |
1075 | printf("backing file: %s (actual path: %s)\n", | |
1076 | backing_filename, | |
1077 | backing_filename2); | |
1078 | } | |
1079 | dump_snapshots(bs); | |
1080 | bdrv_delete(bs); | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | #define SNAPSHOT_LIST 1 | |
1085 | #define SNAPSHOT_CREATE 2 | |
1086 | #define SNAPSHOT_APPLY 3 | |
1087 | #define SNAPSHOT_DELETE 4 | |
1088 | ||
1089 | static int img_snapshot(int argc, char **argv) | |
1090 | { | |
1091 | BlockDriverState *bs; | |
1092 | QEMUSnapshotInfo sn; | |
1093 | char *filename, *snapshot_name = NULL; | |
1094 | int c, ret = 0, bdrv_oflags; | |
1095 | int action = 0; | |
1096 | qemu_timeval tv; | |
1097 | ||
1098 | bdrv_oflags = BDRV_O_RDWR; | |
1099 | /* Parse commandline parameters */ | |
1100 | for(;;) { | |
1101 | c = getopt(argc, argv, "la:c:d:h"); | |
1102 | if (c == -1) | |
1103 | break; | |
1104 | switch(c) { | |
1105 | case 'h': | |
1106 | help(); | |
1107 | return 0; | |
1108 | case 'l': | |
1109 | if (action) { | |
1110 | help(); | |
1111 | return 0; | |
1112 | } | |
1113 | action = SNAPSHOT_LIST; | |
1114 | bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */ | |
1115 | break; | |
1116 | case 'a': | |
1117 | if (action) { | |
1118 | help(); | |
1119 | return 0; | |
1120 | } | |
1121 | action = SNAPSHOT_APPLY; | |
1122 | snapshot_name = optarg; | |
1123 | break; | |
1124 | case 'c': | |
1125 | if (action) { | |
1126 | help(); | |
1127 | return 0; | |
1128 | } | |
1129 | action = SNAPSHOT_CREATE; | |
1130 | snapshot_name = optarg; | |
1131 | break; | |
1132 | case 'd': | |
1133 | if (action) { | |
1134 | help(); | |
1135 | return 0; | |
1136 | } | |
1137 | action = SNAPSHOT_DELETE; | |
1138 | snapshot_name = optarg; | |
1139 | break; | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | if (optind >= argc) | |
1144 | help(); | |
1145 | filename = argv[optind++]; | |
1146 | ||
1147 | /* Open the image */ | |
1148 | bs = bdrv_new_open(filename, NULL, bdrv_oflags); | |
1149 | if (!bs) { | |
1150 | return 1; | |
1151 | } | |
1152 | ||
1153 | /* Perform the requested action */ | |
1154 | switch(action) { | |
1155 | case SNAPSHOT_LIST: | |
1156 | dump_snapshots(bs); | |
1157 | break; | |
1158 | ||
1159 | case SNAPSHOT_CREATE: | |
1160 | memset(&sn, 0, sizeof(sn)); | |
1161 | pstrcpy(sn.name, sizeof(sn.name), snapshot_name); | |
1162 | ||
1163 | qemu_gettimeofday(&tv); | |
1164 | sn.date_sec = tv.tv_sec; | |
1165 | sn.date_nsec = tv.tv_usec * 1000; | |
1166 | ||
1167 | ret = bdrv_snapshot_create(bs, &sn); | |
1168 | if (ret) | |
1169 | error("Could not create snapshot '%s': %d (%s)", | |
1170 | snapshot_name, ret, strerror(-ret)); | |
1171 | break; | |
1172 | ||
1173 | case SNAPSHOT_APPLY: | |
1174 | ret = bdrv_snapshot_goto(bs, snapshot_name); | |
1175 | if (ret) | |
1176 | error("Could not apply snapshot '%s': %d (%s)", | |
1177 | snapshot_name, ret, strerror(-ret)); | |
1178 | break; | |
1179 | ||
1180 | case SNAPSHOT_DELETE: | |
1181 | ret = bdrv_snapshot_delete(bs, snapshot_name); | |
1182 | if (ret) | |
1183 | error("Could not delete snapshot '%s': %d (%s)", | |
1184 | snapshot_name, ret, strerror(-ret)); | |
1185 | break; | |
1186 | } | |
1187 | ||
1188 | /* Cleanup */ | |
1189 | bdrv_delete(bs); | |
1190 | if (ret) { | |
1191 | return 1; | |
1192 | } | |
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | static int img_rebase(int argc, char **argv) | |
1197 | { | |
1198 | BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; | |
1199 | BlockDriver *old_backing_drv, *new_backing_drv; | |
1200 | char *filename; | |
1201 | const char *fmt, *out_basefmt, *out_baseimg; | |
1202 | int c, flags, ret; | |
1203 | int unsafe = 0; | |
1204 | ||
1205 | /* Parse commandline parameters */ | |
1206 | fmt = NULL; | |
1207 | out_baseimg = NULL; | |
1208 | out_basefmt = NULL; | |
1209 | ||
1210 | for(;;) { | |
1211 | c = getopt(argc, argv, "uhf:F:b:"); | |
1212 | if (c == -1) | |
1213 | break; | |
1214 | switch(c) { | |
1215 | case 'h': | |
1216 | help(); | |
1217 | return 0; | |
1218 | case 'f': | |
1219 | fmt = optarg; | |
1220 | break; | |
1221 | case 'F': | |
1222 | out_basefmt = optarg; | |
1223 | break; | |
1224 | case 'b': | |
1225 | out_baseimg = optarg; | |
1226 | break; | |
1227 | case 'u': | |
1228 | unsafe = 1; | |
1229 | break; | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | if ((optind >= argc) || !out_baseimg) | |
1234 | help(); | |
1235 | filename = argv[optind++]; | |
1236 | ||
1237 | /* | |
1238 | * Open the images. | |
1239 | * | |
1240 | * Ignore the old backing file for unsafe rebase in case we want to correct | |
1241 | * the reference to a renamed or moved backing file. | |
1242 | */ | |
1243 | flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0); | |
1244 | bs = bdrv_new_open(filename, fmt, flags); | |
1245 | if (!bs) { | |
1246 | return 1; | |
1247 | } | |
1248 | ||
1249 | /* Find the right drivers for the backing files */ | |
1250 | old_backing_drv = NULL; | |
1251 | new_backing_drv = NULL; | |
1252 | ||
1253 | if (!unsafe && bs->backing_format[0] != '\0') { | |
1254 | old_backing_drv = bdrv_find_format(bs->backing_format); | |
1255 | if (old_backing_drv == NULL) { | |
1256 | error("Invalid format name: '%s'", bs->backing_format); | |
1257 | ret = -1; | |
1258 | goto out; | |
1259 | } | |
1260 | } | |
1261 | ||
1262 | if (out_basefmt != NULL) { | |
1263 | new_backing_drv = bdrv_find_format(out_basefmt); | |
1264 | if (new_backing_drv == NULL) { | |
1265 | error("Invalid format name: '%s'", out_basefmt); | |
1266 | ret = -1; | |
1267 | goto out; | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | /* For safe rebasing we need to compare old and new backing file */ | |
1272 | if (unsafe) { | |
1273 | /* Make the compiler happy */ | |
1274 | bs_old_backing = NULL; | |
1275 | bs_new_backing = NULL; | |
1276 | } else { | |
1277 | char backing_name[1024]; | |
1278 | ||
1279 | bs_old_backing = bdrv_new("old_backing"); | |
1280 | bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); | |
1281 | ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, | |
1282 | old_backing_drv); | |
1283 | if (ret) { | |
1284 | error("Could not open old backing file '%s'", backing_name); | |
1285 | goto out; | |
1286 | } | |
1287 | ||
1288 | bs_new_backing = bdrv_new("new_backing"); | |
1289 | ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS | BDRV_O_RDWR, | |
1290 | new_backing_drv); | |
1291 | if (ret) { | |
1292 | error("Could not open new backing file '%s'", out_baseimg); | |
1293 | goto out; | |
1294 | } | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Check each unallocated cluster in the COW file. If it is unallocated, | |
1299 | * accesses go to the backing file. We must therefore compare this cluster | |
1300 | * in the old and new backing file, and if they differ we need to copy it | |
1301 | * from the old backing file into the COW file. | |
1302 | * | |
1303 | * If qemu-img crashes during this step, no harm is done. The content of | |
1304 | * the image is the same as the original one at any time. | |
1305 | */ | |
1306 | if (!unsafe) { | |
1307 | uint64_t num_sectors; | |
1308 | uint64_t sector; | |
1309 | int n; | |
1310 | uint8_t * buf_old; | |
1311 | uint8_t * buf_new; | |
1312 | ||
1313 | buf_old = qemu_malloc(IO_BUF_SIZE); | |
1314 | buf_new = qemu_malloc(IO_BUF_SIZE); | |
1315 | ||
1316 | bdrv_get_geometry(bs, &num_sectors); | |
1317 | ||
1318 | for (sector = 0; sector < num_sectors; sector += n) { | |
1319 | ||
1320 | /* How many sectors can we handle with the next read? */ | |
1321 | if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { | |
1322 | n = (IO_BUF_SIZE / 512); | |
1323 | } else { | |
1324 | n = num_sectors - sector; | |
1325 | } | |
1326 | ||
1327 | /* If the cluster is allocated, we don't need to take action */ | |
1328 | ret = bdrv_is_allocated(bs, sector, n, &n); | |
1329 | if (ret) { | |
1330 | continue; | |
1331 | } | |
1332 | ||
1333 | /* Read old and new backing file */ | |
1334 | ret = bdrv_read(bs_old_backing, sector, buf_old, n); | |
1335 | if (ret < 0) { | |
1336 | error("error while reading from old backing file"); | |
1337 | goto out; | |
1338 | } | |
1339 | ret = bdrv_read(bs_new_backing, sector, buf_new, n); | |
1340 | if (ret < 0) { | |
1341 | error("error while reading from new backing file"); | |
1342 | goto out; | |
1343 | } | |
1344 | ||
1345 | /* If they differ, we need to write to the COW file */ | |
1346 | uint64_t written = 0; | |
1347 | ||
1348 | while (written < n) { | |
1349 | int pnum; | |
1350 | ||
1351 | if (compare_sectors(buf_old + written * 512, | |
1352 | buf_new + written * 512, n - written, &pnum)) | |
1353 | { | |
1354 | ret = bdrv_write(bs, sector + written, | |
1355 | buf_old + written * 512, pnum); | |
1356 | if (ret < 0) { | |
1357 | error("Error while writing to COW image: %s", | |
1358 | strerror(-ret)); | |
1359 | goto out; | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | written += pnum; | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | qemu_free(buf_old); | |
1368 | qemu_free(buf_new); | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * Change the backing file. All clusters that are different from the old | |
1373 | * backing file are overwritten in the COW file now, so the visible content | |
1374 | * doesn't change when we switch the backing file. | |
1375 | */ | |
1376 | ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); | |
1377 | if (ret == -ENOSPC) { | |
1378 | error("Could not change the backing file to '%s': No space left in " | |
1379 | "the file header", out_baseimg); | |
1380 | } else if (ret < 0) { | |
1381 | error("Could not change the backing file to '%s': %s", | |
1382 | out_baseimg, strerror(-ret)); | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * TODO At this point it is possible to check if any clusters that are | |
1387 | * allocated in the COW file are the same in the backing file. If so, they | |
1388 | * could be dropped from the COW file. Don't do this before switching the | |
1389 | * backing file, in case of a crash this would lead to corruption. | |
1390 | */ | |
1391 | out: | |
1392 | /* Cleanup */ | |
1393 | if (!unsafe) { | |
1394 | bdrv_delete(bs_old_backing); | |
1395 | bdrv_delete(bs_new_backing); | |
1396 | } | |
1397 | ||
1398 | bdrv_delete(bs); | |
1399 | if (ret) { | |
1400 | return 1; | |
1401 | } | |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | static int img_resize(int argc, char **argv) | |
1406 | { | |
1407 | int c, ret, relative; | |
1408 | const char *filename, *fmt, *size; | |
1409 | int64_t n, total_size; | |
1410 | BlockDriverState *bs; | |
1411 | QEMUOptionParameter *param; | |
1412 | QEMUOptionParameter resize_options[] = { | |
1413 | { | |
1414 | .name = BLOCK_OPT_SIZE, | |
1415 | .type = OPT_SIZE, | |
1416 | .help = "Virtual disk size" | |
1417 | }, | |
1418 | { NULL } | |
1419 | }; | |
1420 | ||
1421 | fmt = NULL; | |
1422 | for(;;) { | |
1423 | c = getopt(argc, argv, "f:h"); | |
1424 | if (c == -1) { | |
1425 | break; | |
1426 | } | |
1427 | switch(c) { | |
1428 | case 'h': | |
1429 | help(); | |
1430 | break; | |
1431 | case 'f': | |
1432 | fmt = optarg; | |
1433 | break; | |
1434 | } | |
1435 | } | |
1436 | if (optind + 1 >= argc) { | |
1437 | help(); | |
1438 | } | |
1439 | filename = argv[optind++]; | |
1440 | size = argv[optind++]; | |
1441 | ||
1442 | /* Choose grow, shrink, or absolute resize mode */ | |
1443 | switch (size[0]) { | |
1444 | case '+': | |
1445 | relative = 1; | |
1446 | size++; | |
1447 | break; | |
1448 | case '-': | |
1449 | relative = -1; | |
1450 | size++; | |
1451 | break; | |
1452 | default: | |
1453 | relative = 0; | |
1454 | break; | |
1455 | } | |
1456 | ||
1457 | /* Parse size */ | |
1458 | param = parse_option_parameters("", resize_options, NULL); | |
1459 | if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) { | |
1460 | /* Error message already printed when size parsing fails */ | |
1461 | exit(1); | |
1462 | } | |
1463 | n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n; | |
1464 | free_option_parameters(param); | |
1465 | ||
1466 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); | |
1467 | if (!bs) { | |
1468 | return 1; | |
1469 | } | |
1470 | ||
1471 | if (relative) { | |
1472 | total_size = bdrv_getlength(bs) + n * relative; | |
1473 | } else { | |
1474 | total_size = n; | |
1475 | } | |
1476 | if (total_size <= 0) { | |
1477 | error("New image size must be positive"); | |
1478 | ret = -1; | |
1479 | goto out; | |
1480 | } | |
1481 | ||
1482 | ret = bdrv_truncate(bs, total_size); | |
1483 | switch (ret) { | |
1484 | case 0: | |
1485 | printf("Image resized.\n"); | |
1486 | break; | |
1487 | case -ENOTSUP: | |
1488 | error("This image format does not support resize"); | |
1489 | break; | |
1490 | case -EACCES: | |
1491 | error("Image is read-only"); | |
1492 | break; | |
1493 | default: | |
1494 | error("Error resizing image (%d)", -ret); | |
1495 | break; | |
1496 | } | |
1497 | out: | |
1498 | bdrv_delete(bs); | |
1499 | if (ret) { | |
1500 | return 1; | |
1501 | } | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | static const img_cmd_t img_cmds[] = { | |
1506 | #define DEF(option, callback, arg_string) \ | |
1507 | { option, callback }, | |
1508 | #include "qemu-img-cmds.h" | |
1509 | #undef DEF | |
1510 | #undef GEN_DOCS | |
1511 | { NULL, NULL, }, | |
1512 | }; | |
1513 | ||
1514 | int main(int argc, char **argv) | |
1515 | { | |
1516 | const img_cmd_t *cmd; | |
1517 | const char *cmdname; | |
1518 | ||
1519 | bdrv_init(); | |
1520 | if (argc < 2) | |
1521 | help(); | |
1522 | cmdname = argv[1]; | |
1523 | argc--; argv++; | |
1524 | ||
1525 | /* find the command */ | |
1526 | for(cmd = img_cmds; cmd->name != NULL; cmd++) { | |
1527 | if (!strcmp(cmdname, cmd->name)) { | |
1528 | return cmd->handler(argc, argv); | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | /* not found */ | |
1533 | help(); | |
1534 | return 0; | |
1535 | } |