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