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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' and 'unsafe'\n" | |
70 | " 'size' is the disk image size in bytes. Optional suffixes\n" | |
71 | " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n" | |
72 | " and T (terabyte, 1024G) are supported. 'b' is ignored.\n" | |
73 | " 'output_filename' is the destination disk image filename\n" | |
74 | " 'output_fmt' is the destination format\n" | |
75 | " 'options' is a comma separated list of format specific options in a\n" | |
76 | " name=value format. Use -o ? for an overview of the options supported by the\n" | |
77 | " used format\n" | |
78 | " '-c' indicates that target image must be compressed (qcow format only)\n" | |
79 | " '-u' enables unsafe rebasing. It is assumed that old and new backing file\n" | |
80 | " match exactly. The image doesn't need a working backing file before\n" | |
81 | " rebasing in this case (useful for renaming the backing file)\n" | |
82 | " '-h' with or without a command shows this help and lists the supported formats\n" | |
83 | " '-p' show progress of command (only certain commands)\n" | |
84 | "\n" | |
85 | "Parameters to snapshot subcommand:\n" | |
86 | " 'snapshot' is the name of the snapshot to create, apply or delete\n" | |
87 | " '-a' applies a snapshot (revert disk to saved state)\n" | |
88 | " '-c' creates a snapshot\n" | |
89 | " '-d' deletes a snapshot\n" | |
90 | " '-l' lists all snapshots in the given image\n"; | |
91 | ||
92 | printf("%s\nSupported formats:", help_msg); | |
93 | bdrv_iterate_format(format_print, NULL); | |
94 | printf("\n"); | |
95 | exit(1); | |
96 | } | |
97 | ||
98 | #if defined(WIN32) | |
99 | /* XXX: put correct support for win32 */ | |
100 | static int read_password(char *buf, int buf_size) | |
101 | { | |
102 | int c, i; | |
103 | printf("Password: "); | |
104 | fflush(stdout); | |
105 | i = 0; | |
106 | for(;;) { | |
107 | c = getchar(); | |
108 | if (c == '\n') | |
109 | break; | |
110 | if (i < (buf_size - 1)) | |
111 | buf[i++] = c; | |
112 | } | |
113 | buf[i] = '\0'; | |
114 | return 0; | |
115 | } | |
116 | ||
117 | #else | |
118 | ||
119 | #include <termios.h> | |
120 | ||
121 | static struct termios oldtty; | |
122 | ||
123 | static void term_exit(void) | |
124 | { | |
125 | tcsetattr (0, TCSANOW, &oldtty); | |
126 | } | |
127 | ||
128 | static void term_init(void) | |
129 | { | |
130 | struct termios tty; | |
131 | ||
132 | tcgetattr (0, &tty); | |
133 | oldtty = tty; | |
134 | ||
135 | tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP | |
136 | |INLCR|IGNCR|ICRNL|IXON); | |
137 | tty.c_oflag |= OPOST; | |
138 | tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); | |
139 | tty.c_cflag &= ~(CSIZE|PARENB); | |
140 | tty.c_cflag |= CS8; | |
141 | tty.c_cc[VMIN] = 1; | |
142 | tty.c_cc[VTIME] = 0; | |
143 | ||
144 | tcsetattr (0, TCSANOW, &tty); | |
145 | ||
146 | atexit(term_exit); | |
147 | } | |
148 | ||
149 | static int read_password(char *buf, int buf_size) | |
150 | { | |
151 | uint8_t ch; | |
152 | int i, ret; | |
153 | ||
154 | printf("password: "); | |
155 | fflush(stdout); | |
156 | term_init(); | |
157 | i = 0; | |
158 | for(;;) { | |
159 | ret = read(0, &ch, 1); | |
160 | if (ret == -1) { | |
161 | if (errno == EAGAIN || errno == EINTR) { | |
162 | continue; | |
163 | } else { | |
164 | ret = -1; | |
165 | break; | |
166 | } | |
167 | } else if (ret == 0) { | |
168 | ret = -1; | |
169 | break; | |
170 | } else { | |
171 | if (ch == '\r') { | |
172 | ret = 0; | |
173 | break; | |
174 | } | |
175 | if (i < (buf_size - 1)) | |
176 | buf[i++] = ch; | |
177 | } | |
178 | } | |
179 | term_exit(); | |
180 | buf[i] = '\0'; | |
181 | printf("\n"); | |
182 | return ret; | |
183 | } | |
184 | #endif | |
185 | ||
186 | static int set_cache_flag(const char *mode, int *flags) | |
187 | { | |
188 | *flags &= ~BDRV_O_CACHE_MASK; | |
189 | ||
190 | if (!strcmp(mode, "none") || !strcmp(mode, "off")) { | |
191 | *flags |= BDRV_O_CACHE_WB; | |
192 | *flags |= BDRV_O_NOCACHE; | |
193 | } else if (!strcmp(mode, "writeback")) { | |
194 | *flags |= BDRV_O_CACHE_WB; | |
195 | } else if (!strcmp(mode, "unsafe")) { | |
196 | *flags |= BDRV_O_CACHE_WB; | |
197 | *flags |= BDRV_O_NO_FLUSH; | |
198 | } else if (!strcmp(mode, "writethrough")) { | |
199 | /* this is the default */ | |
200 | } else { | |
201 | return -1; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static int print_block_option_help(const char *filename, const char *fmt) | |
208 | { | |
209 | BlockDriver *drv, *proto_drv; | |
210 | QEMUOptionParameter *create_options = NULL; | |
211 | ||
212 | /* Find driver and parse its options */ | |
213 | drv = bdrv_find_format(fmt); | |
214 | if (!drv) { | |
215 | error_report("Unknown file format '%s'", fmt); | |
216 | return 1; | |
217 | } | |
218 | ||
219 | proto_drv = bdrv_find_protocol(filename); | |
220 | if (!proto_drv) { | |
221 | error_report("Unknown protocol '%s'", filename); | |
222 | return 1; | |
223 | } | |
224 | ||
225 | create_options = append_option_parameters(create_options, | |
226 | drv->create_options); | |
227 | create_options = append_option_parameters(create_options, | |
228 | proto_drv->create_options); | |
229 | print_option_help(create_options); | |
230 | free_option_parameters(create_options); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static BlockDriverState *bdrv_new_open(const char *filename, | |
235 | const char *fmt, | |
236 | int flags) | |
237 | { | |
238 | BlockDriverState *bs; | |
239 | BlockDriver *drv; | |
240 | char password[256]; | |
241 | int ret; | |
242 | ||
243 | bs = bdrv_new("image"); | |
244 | ||
245 | if (fmt) { | |
246 | drv = bdrv_find_format(fmt); | |
247 | if (!drv) { | |
248 | error_report("Unknown file format '%s'", fmt); | |
249 | goto fail; | |
250 | } | |
251 | } else { | |
252 | drv = NULL; | |
253 | } | |
254 | ||
255 | ret = bdrv_open(bs, filename, flags, drv); | |
256 | if (ret < 0) { | |
257 | error_report("Could not open '%s': %s", filename, strerror(-ret)); | |
258 | goto fail; | |
259 | } | |
260 | ||
261 | if (bdrv_is_encrypted(bs)) { | |
262 | printf("Disk image '%s' is encrypted.\n", filename); | |
263 | if (read_password(password, sizeof(password)) < 0) { | |
264 | error_report("No password given"); | |
265 | goto fail; | |
266 | } | |
267 | if (bdrv_set_key(bs, password) < 0) { | |
268 | error_report("invalid password"); | |
269 | goto fail; | |
270 | } | |
271 | } | |
272 | return bs; | |
273 | fail: | |
274 | if (bs) { | |
275 | bdrv_delete(bs); | |
276 | } | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, | |
281 | const char *base_filename, | |
282 | const char *base_fmt) | |
283 | { | |
284 | if (base_filename) { | |
285 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) { | |
286 | error_report("Backing file not supported for file format '%s'", | |
287 | fmt); | |
288 | return -1; | |
289 | } | |
290 | } | |
291 | if (base_fmt) { | |
292 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
293 | error_report("Backing file format not supported for file " | |
294 | "format '%s'", fmt); | |
295 | return -1; | |
296 | } | |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int img_create(int argc, char **argv) | |
302 | { | |
303 | int c, ret = 0; | |
304 | uint64_t img_size = -1; | |
305 | const char *fmt = "raw"; | |
306 | const char *base_fmt = NULL; | |
307 | const char *filename; | |
308 | const char *base_filename = NULL; | |
309 | char *options = NULL; | |
310 | ||
311 | for(;;) { | |
312 | c = getopt(argc, argv, "F:b:f:he6o:"); | |
313 | if (c == -1) { | |
314 | break; | |
315 | } | |
316 | switch(c) { | |
317 | case '?': | |
318 | case 'h': | |
319 | help(); | |
320 | break; | |
321 | case 'F': | |
322 | base_fmt = optarg; | |
323 | break; | |
324 | case 'b': | |
325 | base_filename = optarg; | |
326 | break; | |
327 | case 'f': | |
328 | fmt = optarg; | |
329 | break; | |
330 | case 'e': | |
331 | error_report("option -e is deprecated, please use \'-o " | |
332 | "encryption\' instead!"); | |
333 | return 1; | |
334 | case '6': | |
335 | error_report("option -6 is deprecated, please use \'-o " | |
336 | "compat6\' instead!"); | |
337 | return 1; | |
338 | case 'o': | |
339 | options = optarg; | |
340 | break; | |
341 | } | |
342 | } | |
343 | ||
344 | /* Get the filename */ | |
345 | if (optind >= argc) { | |
346 | help(); | |
347 | } | |
348 | filename = argv[optind++]; | |
349 | ||
350 | /* Get image size, if specified */ | |
351 | if (optind < argc) { | |
352 | int64_t sval; | |
353 | sval = strtosz_suffix(argv[optind++], NULL, STRTOSZ_DEFSUFFIX_B); | |
354 | if (sval < 0) { | |
355 | error_report("Invalid image size specified! You may use k, M, G or " | |
356 | "T suffixes for "); | |
357 | error_report("kilobytes, megabytes, gigabytes and terabytes."); | |
358 | ret = -1; | |
359 | goto out; | |
360 | } | |
361 | img_size = (uint64_t)sval; | |
362 | } | |
363 | ||
364 | if (options && !strcmp(options, "?")) { | |
365 | ret = print_block_option_help(filename, fmt); | |
366 | goto out; | |
367 | } | |
368 | ||
369 | ret = bdrv_img_create(filename, fmt, base_filename, base_fmt, | |
370 | options, img_size, BDRV_O_FLAGS); | |
371 | out: | |
372 | if (ret) { | |
373 | return 1; | |
374 | } | |
375 | return 0; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Checks an image for consistency. Exit codes: | |
380 | * | |
381 | * 0 - Check completed, image is good | |
382 | * 1 - Check not completed because of internal errors | |
383 | * 2 - Check completed, image is corrupted | |
384 | * 3 - Check completed, image has leaked clusters, but is good otherwise | |
385 | */ | |
386 | static int img_check(int argc, char **argv) | |
387 | { | |
388 | int c, ret; | |
389 | const char *filename, *fmt; | |
390 | BlockDriverState *bs; | |
391 | BdrvCheckResult result; | |
392 | ||
393 | fmt = NULL; | |
394 | for(;;) { | |
395 | c = getopt(argc, argv, "f:h"); | |
396 | if (c == -1) { | |
397 | break; | |
398 | } | |
399 | switch(c) { | |
400 | case '?': | |
401 | case 'h': | |
402 | help(); | |
403 | break; | |
404 | case 'f': | |
405 | fmt = optarg; | |
406 | break; | |
407 | } | |
408 | } | |
409 | if (optind >= argc) { | |
410 | help(); | |
411 | } | |
412 | filename = argv[optind++]; | |
413 | ||
414 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); | |
415 | if (!bs) { | |
416 | return 1; | |
417 | } | |
418 | ret = bdrv_check(bs, &result); | |
419 | ||
420 | if (ret == -ENOTSUP) { | |
421 | error_report("This image format does not support checks"); | |
422 | bdrv_delete(bs); | |
423 | return 1; | |
424 | } | |
425 | ||
426 | if (!(result.corruptions || result.leaks || result.check_errors)) { | |
427 | printf("No errors were found on the image.\n"); | |
428 | } else { | |
429 | if (result.corruptions) { | |
430 | printf("\n%d errors were found on the image.\n" | |
431 | "Data may be corrupted, or further writes to the image " | |
432 | "may corrupt it.\n", | |
433 | result.corruptions); | |
434 | } | |
435 | ||
436 | if (result.leaks) { | |
437 | printf("\n%d leaked clusters were found on the image.\n" | |
438 | "This means waste of disk space, but no harm to data.\n", | |
439 | result.leaks); | |
440 | } | |
441 | ||
442 | if (result.check_errors) { | |
443 | printf("\n%d internal errors have occurred during the check.\n", | |
444 | result.check_errors); | |
445 | } | |
446 | } | |
447 | ||
448 | bdrv_delete(bs); | |
449 | ||
450 | if (ret < 0 || result.check_errors) { | |
451 | printf("\nAn error has occurred during the check: %s\n" | |
452 | "The check is not complete and may have missed error.\n", | |
453 | strerror(-ret)); | |
454 | return 1; | |
455 | } | |
456 | ||
457 | if (result.corruptions) { | |
458 | return 2; | |
459 | } else if (result.leaks) { | |
460 | return 3; | |
461 | } else { | |
462 | return 0; | |
463 | } | |
464 | } | |
465 | ||
466 | static int img_commit(int argc, char **argv) | |
467 | { | |
468 | int c, ret, flags; | |
469 | const char *filename, *fmt, *cache; | |
470 | BlockDriverState *bs; | |
471 | ||
472 | fmt = NULL; | |
473 | cache = BDRV_DEFAULT_CACHE; | |
474 | for(;;) { | |
475 | c = getopt(argc, argv, "f:ht:"); | |
476 | if (c == -1) { | |
477 | break; | |
478 | } | |
479 | switch(c) { | |
480 | case '?': | |
481 | case 'h': | |
482 | help(); | |
483 | break; | |
484 | case 'f': | |
485 | fmt = optarg; | |
486 | break; | |
487 | case 't': | |
488 | cache = optarg; | |
489 | break; | |
490 | } | |
491 | } | |
492 | if (optind >= argc) { | |
493 | help(); | |
494 | } | |
495 | filename = argv[optind++]; | |
496 | ||
497 | flags = BDRV_O_RDWR; | |
498 | ret = set_cache_flag(cache, &flags); | |
499 | if (ret < 0) { | |
500 | error_report("Invalid cache option: %s", cache); | |
501 | return -1; | |
502 | } | |
503 | ||
504 | bs = bdrv_new_open(filename, fmt, flags); | |
505 | if (!bs) { | |
506 | return 1; | |
507 | } | |
508 | ret = bdrv_commit(bs); | |
509 | switch(ret) { | |
510 | case 0: | |
511 | printf("Image committed.\n"); | |
512 | break; | |
513 | case -ENOENT: | |
514 | error_report("No disk inserted"); | |
515 | break; | |
516 | case -EACCES: | |
517 | error_report("Image is read-only"); | |
518 | break; | |
519 | case -ENOTSUP: | |
520 | error_report("Image is already committed"); | |
521 | break; | |
522 | default: | |
523 | error_report("Error while committing image"); | |
524 | break; | |
525 | } | |
526 | ||
527 | bdrv_delete(bs); | |
528 | if (ret) { | |
529 | return 1; | |
530 | } | |
531 | return 0; | |
532 | } | |
533 | ||
534 | /* | |
535 | * Checks whether the sector is not a zero sector. | |
536 | * | |
537 | * Attention! The len must be a multiple of 4 * sizeof(long) due to | |
538 | * restriction of optimizations in this function. | |
539 | */ | |
540 | static int is_not_zero(const uint8_t *sector, int len) | |
541 | { | |
542 | /* | |
543 | * Use long as the biggest available internal data type that fits into the | |
544 | * CPU register and unroll the loop to smooth out the effect of memory | |
545 | * latency. | |
546 | */ | |
547 | ||
548 | int i; | |
549 | long d0, d1, d2, d3; | |
550 | const long * const data = (const long *) sector; | |
551 | ||
552 | len /= sizeof(long); | |
553 | ||
554 | for(i = 0; i < len; i += 4) { | |
555 | d0 = data[i + 0]; | |
556 | d1 = data[i + 1]; | |
557 | d2 = data[i + 2]; | |
558 | d3 = data[i + 3]; | |
559 | ||
560 | if (d0 || d1 || d2 || d3) { | |
561 | return 1; | |
562 | } | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | /* | |
569 | * Returns true iff the first sector pointed to by 'buf' contains at least | |
570 | * a non-NUL byte. | |
571 | * | |
572 | * 'pnum' is set to the number of sectors (including and immediately following | |
573 | * the first one) that are known to be in the same allocated/unallocated state. | |
574 | */ | |
575 | static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) | |
576 | { | |
577 | int v, i; | |
578 | ||
579 | if (n <= 0) { | |
580 | *pnum = 0; | |
581 | return 0; | |
582 | } | |
583 | v = is_not_zero(buf, 512); | |
584 | for(i = 1; i < n; i++) { | |
585 | buf += 512; | |
586 | if (v != is_not_zero(buf, 512)) | |
587 | break; | |
588 | } | |
589 | *pnum = i; | |
590 | return v; | |
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 | ||
644 | fmt = NULL; | |
645 | out_fmt = "raw"; | |
646 | cache = "unsafe"; | |
647 | out_baseimg = NULL; | |
648 | compress = 0; | |
649 | for(;;) { | |
650 | c = getopt(argc, argv, "f:O:B:s:hce6o:pt:"); | |
651 | if (c == -1) { | |
652 | break; | |
653 | } | |
654 | switch(c) { | |
655 | case '?': | |
656 | case 'h': | |
657 | help(); | |
658 | break; | |
659 | case 'f': | |
660 | fmt = optarg; | |
661 | break; | |
662 | case 'O': | |
663 | out_fmt = optarg; | |
664 | break; | |
665 | case 'B': | |
666 | out_baseimg = optarg; | |
667 | break; | |
668 | case 'c': | |
669 | compress = 1; | |
670 | break; | |
671 | case 'e': | |
672 | error_report("option -e is deprecated, please use \'-o " | |
673 | "encryption\' instead!"); | |
674 | return 1; | |
675 | case '6': | |
676 | error_report("option -6 is deprecated, please use \'-o " | |
677 | "compat6\' instead!"); | |
678 | return 1; | |
679 | case 'o': | |
680 | options = optarg; | |
681 | break; | |
682 | case 's': | |
683 | snapshot_name = optarg; | |
684 | break; | |
685 | case 'p': | |
686 | progress = 1; | |
687 | break; | |
688 | case 't': | |
689 | cache = optarg; | |
690 | break; | |
691 | } | |
692 | } | |
693 | ||
694 | bs_n = argc - optind - 1; | |
695 | if (bs_n < 1) { | |
696 | help(); | |
697 | } | |
698 | ||
699 | out_filename = argv[argc - 1]; | |
700 | ||
701 | if (options && !strcmp(options, "?")) { | |
702 | ret = print_block_option_help(out_filename, out_fmt); | |
703 | goto out; | |
704 | } | |
705 | ||
706 | if (bs_n > 1 && out_baseimg) { | |
707 | error_report("-B makes no sense when concatenating multiple input " | |
708 | "images"); | |
709 | ret = -1; | |
710 | goto out; | |
711 | } | |
712 | ||
713 | qemu_progress_init(progress, 2.0); | |
714 | qemu_progress_print(0, 100); | |
715 | ||
716 | bs = qemu_mallocz(bs_n * sizeof(BlockDriverState *)); | |
717 | ||
718 | total_sectors = 0; | |
719 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
720 | bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); | |
721 | if (!bs[bs_i]) { | |
722 | error_report("Could not open '%s'", argv[optind + bs_i]); | |
723 | ret = -1; | |
724 | goto out; | |
725 | } | |
726 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
727 | total_sectors += bs_sectors; | |
728 | } | |
729 | ||
730 | if (snapshot_name != NULL) { | |
731 | if (bs_n > 1) { | |
732 | error_report("No support for concatenating multiple snapshot"); | |
733 | ret = -1; | |
734 | goto out; | |
735 | } | |
736 | if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) { | |
737 | error_report("Failed to load snapshot"); | |
738 | ret = -1; | |
739 | goto out; | |
740 | } | |
741 | } | |
742 | ||
743 | /* Find driver and parse its options */ | |
744 | drv = bdrv_find_format(out_fmt); | |
745 | if (!drv) { | |
746 | error_report("Unknown file format '%s'", out_fmt); | |
747 | ret = -1; | |
748 | goto out; | |
749 | } | |
750 | ||
751 | proto_drv = bdrv_find_protocol(out_filename); | |
752 | if (!proto_drv) { | |
753 | error_report("Unknown protocol '%s'", out_filename); | |
754 | ret = -1; | |
755 | goto out; | |
756 | } | |
757 | ||
758 | create_options = append_option_parameters(create_options, | |
759 | drv->create_options); | |
760 | create_options = append_option_parameters(create_options, | |
761 | proto_drv->create_options); | |
762 | ||
763 | if (options) { | |
764 | param = parse_option_parameters(options, create_options, param); | |
765 | if (param == NULL) { | |
766 | error_report("Invalid options for file format '%s'.", out_fmt); | |
767 | ret = -1; | |
768 | goto out; | |
769 | } | |
770 | } else { | |
771 | param = parse_option_parameters("", create_options, param); | |
772 | } | |
773 | ||
774 | set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512); | |
775 | ret = add_old_style_options(out_fmt, param, out_baseimg, NULL); | |
776 | if (ret < 0) { | |
777 | goto out; | |
778 | } | |
779 | ||
780 | /* Get backing file name if -o backing_file was used */ | |
781 | out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
782 | if (out_baseimg_param) { | |
783 | out_baseimg = out_baseimg_param->value.s; | |
784 | } | |
785 | ||
786 | /* Check if compression is supported */ | |
787 | if (compress) { | |
788 | QEMUOptionParameter *encryption = | |
789 | get_option_parameter(param, BLOCK_OPT_ENCRYPT); | |
790 | ||
791 | if (!drv->bdrv_write_compressed) { | |
792 | error_report("Compression not supported for this file format"); | |
793 | ret = -1; | |
794 | goto out; | |
795 | } | |
796 | ||
797 | if (encryption && encryption->value.n) { | |
798 | error_report("Compression and encryption not supported at " | |
799 | "the same time"); | |
800 | ret = -1; | |
801 | goto out; | |
802 | } | |
803 | } | |
804 | ||
805 | /* Create the new image */ | |
806 | ret = bdrv_create(drv, out_filename, param); | |
807 | if (ret < 0) { | |
808 | if (ret == -ENOTSUP) { | |
809 | error_report("Formatting not supported for file format '%s'", | |
810 | out_fmt); | |
811 | } else if (ret == -EFBIG) { | |
812 | error_report("The image size is too large for file format '%s'", | |
813 | out_fmt); | |
814 | } else { | |
815 | error_report("%s: error while converting %s: %s", | |
816 | out_filename, out_fmt, strerror(-ret)); | |
817 | } | |
818 | goto out; | |
819 | } | |
820 | ||
821 | flags = BDRV_O_RDWR; | |
822 | ret = set_cache_flag(cache, &flags); | |
823 | if (ret < 0) { | |
824 | error_report("Invalid cache option: %s", cache); | |
825 | return -1; | |
826 | } | |
827 | ||
828 | out_bs = bdrv_new_open(out_filename, out_fmt, flags); | |
829 | if (!out_bs) { | |
830 | ret = -1; | |
831 | goto out; | |
832 | } | |
833 | ||
834 | bs_i = 0; | |
835 | bs_offset = 0; | |
836 | bdrv_get_geometry(bs[0], &bs_sectors); | |
837 | buf = qemu_malloc(IO_BUF_SIZE); | |
838 | ||
839 | if (compress) { | |
840 | ret = bdrv_get_info(out_bs, &bdi); | |
841 | if (ret < 0) { | |
842 | error_report("could not get block driver info"); | |
843 | goto out; | |
844 | } | |
845 | cluster_size = bdi.cluster_size; | |
846 | if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { | |
847 | error_report("invalid cluster size"); | |
848 | ret = -1; | |
849 | goto out; | |
850 | } | |
851 | cluster_sectors = cluster_size >> 9; | |
852 | sector_num = 0; | |
853 | ||
854 | nb_sectors = total_sectors; | |
855 | local_progress = (float)100 / | |
856 | (nb_sectors / MIN(nb_sectors, cluster_sectors)); | |
857 | ||
858 | for(;;) { | |
859 | int64_t bs_num; | |
860 | int remainder; | |
861 | uint8_t *buf2; | |
862 | ||
863 | nb_sectors = total_sectors - sector_num; | |
864 | if (nb_sectors <= 0) | |
865 | break; | |
866 | if (nb_sectors >= cluster_sectors) | |
867 | n = cluster_sectors; | |
868 | else | |
869 | n = nb_sectors; | |
870 | ||
871 | bs_num = sector_num - bs_offset; | |
872 | assert (bs_num >= 0); | |
873 | remainder = n; | |
874 | buf2 = buf; | |
875 | while (remainder > 0) { | |
876 | int nlow; | |
877 | while (bs_num == bs_sectors) { | |
878 | bs_i++; | |
879 | assert (bs_i < bs_n); | |
880 | bs_offset += bs_sectors; | |
881 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
882 | bs_num = 0; | |
883 | /* printf("changing part: sector_num=%" PRId64 ", " | |
884 | "bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64 | |
885 | "\n", sector_num, bs_i, bs_offset, bs_sectors); */ | |
886 | } | |
887 | assert (bs_num < bs_sectors); | |
888 | ||
889 | nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; | |
890 | ||
891 | ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); | |
892 | if (ret < 0) { | |
893 | error_report("error while reading"); | |
894 | goto out; | |
895 | } | |
896 | ||
897 | buf2 += nlow * 512; | |
898 | bs_num += nlow; | |
899 | ||
900 | remainder -= nlow; | |
901 | } | |
902 | assert (remainder == 0); | |
903 | ||
904 | if (n < cluster_sectors) { | |
905 | memset(buf + n * 512, 0, cluster_size - n * 512); | |
906 | } | |
907 | if (is_not_zero(buf, cluster_size)) { | |
908 | ret = bdrv_write_compressed(out_bs, sector_num, buf, | |
909 | cluster_sectors); | |
910 | if (ret != 0) { | |
911 | error_report("error while compressing sector %" PRId64, | |
912 | sector_num); | |
913 | goto out; | |
914 | } | |
915 | } | |
916 | sector_num += n; | |
917 | qemu_progress_print(local_progress, 100); | |
918 | } | |
919 | /* signal EOF to align */ | |
920 | bdrv_write_compressed(out_bs, 0, NULL, 0); | |
921 | } else { | |
922 | int has_zero_init = bdrv_has_zero_init(out_bs); | |
923 | ||
924 | sector_num = 0; // total number of sectors converted so far | |
925 | nb_sectors = total_sectors - sector_num; | |
926 | local_progress = (float)100 / | |
927 | (nb_sectors / MIN(nb_sectors, IO_BUF_SIZE / 512)); | |
928 | ||
929 | for(;;) { | |
930 | nb_sectors = total_sectors - sector_num; | |
931 | if (nb_sectors <= 0) { | |
932 | break; | |
933 | } | |
934 | if (nb_sectors >= (IO_BUF_SIZE / 512)) { | |
935 | n = (IO_BUF_SIZE / 512); | |
936 | } else { | |
937 | n = nb_sectors; | |
938 | } | |
939 | ||
940 | while (sector_num - bs_offset >= bs_sectors) { | |
941 | bs_i ++; | |
942 | assert (bs_i < bs_n); | |
943 | bs_offset += bs_sectors; | |
944 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
945 | /* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, " | |
946 | "bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n", | |
947 | sector_num, bs_i, bs_offset, bs_sectors); */ | |
948 | } | |
949 | ||
950 | if (n > bs_offset + bs_sectors - sector_num) { | |
951 | n = bs_offset + bs_sectors - sector_num; | |
952 | } | |
953 | ||
954 | if (has_zero_init) { | |
955 | /* If the output image is being created as a copy on write image, | |
956 | assume that sectors which are unallocated in the input image | |
957 | are present in both the output's and input's base images (no | |
958 | need to copy them). */ | |
959 | if (out_baseimg) { | |
960 | if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, | |
961 | n, &n1)) { | |
962 | sector_num += n1; | |
963 | continue; | |
964 | } | |
965 | /* The next 'n1' sectors are allocated in the input image. Copy | |
966 | only those as they may be followed by unallocated sectors. */ | |
967 | n = n1; | |
968 | } | |
969 | } else { | |
970 | n1 = n; | |
971 | } | |
972 | ||
973 | ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); | |
974 | if (ret < 0) { | |
975 | error_report("error while reading"); | |
976 | goto out; | |
977 | } | |
978 | /* NOTE: at the same time we convert, we do not write zero | |
979 | sectors to have a chance to compress the image. Ideally, we | |
980 | should add a specific call to have the info to go faster */ | |
981 | buf1 = buf; | |
982 | while (n > 0) { | |
983 | /* If the output image is being created as a copy on write image, | |
984 | copy all sectors even the ones containing only NUL bytes, | |
985 | because they may differ from the sectors in the base image. | |
986 | ||
987 | If the output is to a host device, we also write out | |
988 | sectors that are entirely 0, since whatever data was | |
989 | already there is garbage, not 0s. */ | |
990 | if (!has_zero_init || out_baseimg || | |
991 | is_allocated_sectors(buf1, n, &n1)) { | |
992 | ret = bdrv_write(out_bs, sector_num, buf1, n1); | |
993 | if (ret < 0) { | |
994 | error_report("error while writing"); | |
995 | goto out; | |
996 | } | |
997 | } | |
998 | sector_num += n1; | |
999 | n -= n1; | |
1000 | buf1 += n1 * 512; | |
1001 | } | |
1002 | qemu_progress_print(local_progress, 100); | |
1003 | } | |
1004 | } | |
1005 | out: | |
1006 | qemu_progress_end(); | |
1007 | free_option_parameters(create_options); | |
1008 | free_option_parameters(param); | |
1009 | qemu_free(buf); | |
1010 | if (out_bs) { | |
1011 | bdrv_delete(out_bs); | |
1012 | } | |
1013 | if (bs) { | |
1014 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
1015 | if (bs[bs_i]) { | |
1016 | bdrv_delete(bs[bs_i]); | |
1017 | } | |
1018 | } | |
1019 | qemu_free(bs); | |
1020 | } | |
1021 | if (ret) { | |
1022 | return 1; | |
1023 | } | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | #ifdef _WIN32 | |
1028 | static int64_t get_allocated_file_size(const char *filename) | |
1029 | { | |
1030 | typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); | |
1031 | get_compressed_t get_compressed; | |
1032 | struct _stati64 st; | |
1033 | ||
1034 | /* WinNT support GetCompressedFileSize to determine allocate size */ | |
1035 | get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); | |
1036 | if (get_compressed) { | |
1037 | DWORD high, low; | |
1038 | low = get_compressed(filename, &high); | |
1039 | if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) | |
1040 | return (((int64_t) high) << 32) + low; | |
1041 | } | |
1042 | ||
1043 | if (_stati64(filename, &st) < 0) | |
1044 | return -1; | |
1045 | return st.st_size; | |
1046 | } | |
1047 | #else | |
1048 | static int64_t get_allocated_file_size(const char *filename) | |
1049 | { | |
1050 | struct stat st; | |
1051 | if (stat(filename, &st) < 0) | |
1052 | return -1; | |
1053 | return (int64_t)st.st_blocks * 512; | |
1054 | } | |
1055 | #endif | |
1056 | ||
1057 | static void dump_snapshots(BlockDriverState *bs) | |
1058 | { | |
1059 | QEMUSnapshotInfo *sn_tab, *sn; | |
1060 | int nb_sns, i; | |
1061 | char buf[256]; | |
1062 | ||
1063 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
1064 | if (nb_sns <= 0) | |
1065 | return; | |
1066 | printf("Snapshot list:\n"); | |
1067 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); | |
1068 | for(i = 0; i < nb_sns; i++) { | |
1069 | sn = &sn_tab[i]; | |
1070 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); | |
1071 | } | |
1072 | qemu_free(sn_tab); | |
1073 | } | |
1074 | ||
1075 | static int img_info(int argc, char **argv) | |
1076 | { | |
1077 | int c; | |
1078 | const char *filename, *fmt; | |
1079 | BlockDriverState *bs; | |
1080 | char fmt_name[128], size_buf[128], dsize_buf[128]; | |
1081 | uint64_t total_sectors; | |
1082 | int64_t allocated_size; | |
1083 | char backing_filename[1024]; | |
1084 | char backing_filename2[1024]; | |
1085 | BlockDriverInfo bdi; | |
1086 | ||
1087 | fmt = NULL; | |
1088 | for(;;) { | |
1089 | c = getopt(argc, argv, "f:h"); | |
1090 | if (c == -1) { | |
1091 | break; | |
1092 | } | |
1093 | switch(c) { | |
1094 | case '?': | |
1095 | case 'h': | |
1096 | help(); | |
1097 | break; | |
1098 | case 'f': | |
1099 | fmt = optarg; | |
1100 | break; | |
1101 | } | |
1102 | } | |
1103 | if (optind >= argc) { | |
1104 | help(); | |
1105 | } | |
1106 | filename = argv[optind++]; | |
1107 | ||
1108 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); | |
1109 | if (!bs) { | |
1110 | return 1; | |
1111 | } | |
1112 | bdrv_get_format(bs, fmt_name, sizeof(fmt_name)); | |
1113 | bdrv_get_geometry(bs, &total_sectors); | |
1114 | get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); | |
1115 | allocated_size = get_allocated_file_size(filename); | |
1116 | if (allocated_size < 0) { | |
1117 | snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); | |
1118 | } else { | |
1119 | get_human_readable_size(dsize_buf, sizeof(dsize_buf), | |
1120 | allocated_size); | |
1121 | } | |
1122 | printf("image: %s\n" | |
1123 | "file format: %s\n" | |
1124 | "virtual size: %s (%" PRId64 " bytes)\n" | |
1125 | "disk size: %s\n", | |
1126 | filename, fmt_name, size_buf, | |
1127 | (total_sectors * 512), | |
1128 | dsize_buf); | |
1129 | if (bdrv_is_encrypted(bs)) { | |
1130 | printf("encrypted: yes\n"); | |
1131 | } | |
1132 | if (bdrv_get_info(bs, &bdi) >= 0) { | |
1133 | if (bdi.cluster_size != 0) { | |
1134 | printf("cluster_size: %d\n", bdi.cluster_size); | |
1135 | } | |
1136 | } | |
1137 | bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename)); | |
1138 | if (backing_filename[0] != '\0') { | |
1139 | path_combine(backing_filename2, sizeof(backing_filename2), | |
1140 | filename, backing_filename); | |
1141 | printf("backing file: %s (actual path: %s)\n", | |
1142 | backing_filename, | |
1143 | backing_filename2); | |
1144 | } | |
1145 | dump_snapshots(bs); | |
1146 | bdrv_delete(bs); | |
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | #define SNAPSHOT_LIST 1 | |
1151 | #define SNAPSHOT_CREATE 2 | |
1152 | #define SNAPSHOT_APPLY 3 | |
1153 | #define SNAPSHOT_DELETE 4 | |
1154 | ||
1155 | static int img_snapshot(int argc, char **argv) | |
1156 | { | |
1157 | BlockDriverState *bs; | |
1158 | QEMUSnapshotInfo sn; | |
1159 | char *filename, *snapshot_name = NULL; | |
1160 | int c, ret = 0, bdrv_oflags; | |
1161 | int action = 0; | |
1162 | qemu_timeval tv; | |
1163 | ||
1164 | bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR; | |
1165 | /* Parse commandline parameters */ | |
1166 | for(;;) { | |
1167 | c = getopt(argc, argv, "la:c:d:h"); | |
1168 | if (c == -1) { | |
1169 | break; | |
1170 | } | |
1171 | switch(c) { | |
1172 | case '?': | |
1173 | case 'h': | |
1174 | help(); | |
1175 | return 0; | |
1176 | case 'l': | |
1177 | if (action) { | |
1178 | help(); | |
1179 | return 0; | |
1180 | } | |
1181 | action = SNAPSHOT_LIST; | |
1182 | bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */ | |
1183 | break; | |
1184 | case 'a': | |
1185 | if (action) { | |
1186 | help(); | |
1187 | return 0; | |
1188 | } | |
1189 | action = SNAPSHOT_APPLY; | |
1190 | snapshot_name = optarg; | |
1191 | break; | |
1192 | case 'c': | |
1193 | if (action) { | |
1194 | help(); | |
1195 | return 0; | |
1196 | } | |
1197 | action = SNAPSHOT_CREATE; | |
1198 | snapshot_name = optarg; | |
1199 | break; | |
1200 | case 'd': | |
1201 | if (action) { | |
1202 | help(); | |
1203 | return 0; | |
1204 | } | |
1205 | action = SNAPSHOT_DELETE; | |
1206 | snapshot_name = optarg; | |
1207 | break; | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | if (optind >= argc) { | |
1212 | help(); | |
1213 | } | |
1214 | filename = argv[optind++]; | |
1215 | ||
1216 | /* Open the image */ | |
1217 | bs = bdrv_new_open(filename, NULL, bdrv_oflags); | |
1218 | if (!bs) { | |
1219 | return 1; | |
1220 | } | |
1221 | ||
1222 | /* Perform the requested action */ | |
1223 | switch(action) { | |
1224 | case SNAPSHOT_LIST: | |
1225 | dump_snapshots(bs); | |
1226 | break; | |
1227 | ||
1228 | case SNAPSHOT_CREATE: | |
1229 | memset(&sn, 0, sizeof(sn)); | |
1230 | pstrcpy(sn.name, sizeof(sn.name), snapshot_name); | |
1231 | ||
1232 | qemu_gettimeofday(&tv); | |
1233 | sn.date_sec = tv.tv_sec; | |
1234 | sn.date_nsec = tv.tv_usec * 1000; | |
1235 | ||
1236 | ret = bdrv_snapshot_create(bs, &sn); | |
1237 | if (ret) { | |
1238 | error_report("Could not create snapshot '%s': %d (%s)", | |
1239 | snapshot_name, ret, strerror(-ret)); | |
1240 | } | |
1241 | break; | |
1242 | ||
1243 | case SNAPSHOT_APPLY: | |
1244 | ret = bdrv_snapshot_goto(bs, snapshot_name); | |
1245 | if (ret) { | |
1246 | error_report("Could not apply snapshot '%s': %d (%s)", | |
1247 | snapshot_name, ret, strerror(-ret)); | |
1248 | } | |
1249 | break; | |
1250 | ||
1251 | case SNAPSHOT_DELETE: | |
1252 | ret = bdrv_snapshot_delete(bs, snapshot_name); | |
1253 | if (ret) { | |
1254 | error_report("Could not delete snapshot '%s': %d (%s)", | |
1255 | snapshot_name, ret, strerror(-ret)); | |
1256 | } | |
1257 | break; | |
1258 | } | |
1259 | ||
1260 | /* Cleanup */ | |
1261 | bdrv_delete(bs); | |
1262 | if (ret) { | |
1263 | return 1; | |
1264 | } | |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | static int img_rebase(int argc, char **argv) | |
1269 | { | |
1270 | BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; | |
1271 | BlockDriver *old_backing_drv, *new_backing_drv; | |
1272 | char *filename; | |
1273 | const char *fmt, *cache, *out_basefmt, *out_baseimg; | |
1274 | int c, flags, ret; | |
1275 | int unsafe = 0; | |
1276 | int progress = 0; | |
1277 | ||
1278 | /* Parse commandline parameters */ | |
1279 | fmt = NULL; | |
1280 | cache = BDRV_DEFAULT_CACHE; | |
1281 | out_baseimg = NULL; | |
1282 | out_basefmt = NULL; | |
1283 | for(;;) { | |
1284 | c = getopt(argc, argv, "uhf:F:b:pt:"); | |
1285 | if (c == -1) { | |
1286 | break; | |
1287 | } | |
1288 | switch(c) { | |
1289 | case '?': | |
1290 | case 'h': | |
1291 | help(); | |
1292 | return 0; | |
1293 | case 'f': | |
1294 | fmt = optarg; | |
1295 | break; | |
1296 | case 'F': | |
1297 | out_basefmt = optarg; | |
1298 | break; | |
1299 | case 'b': | |
1300 | out_baseimg = optarg; | |
1301 | break; | |
1302 | case 'u': | |
1303 | unsafe = 1; | |
1304 | break; | |
1305 | case 'p': | |
1306 | progress = 1; | |
1307 | break; | |
1308 | case 't': | |
1309 | cache = optarg; | |
1310 | break; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | if ((optind >= argc) || (!unsafe && !out_baseimg)) { | |
1315 | help(); | |
1316 | } | |
1317 | filename = argv[optind++]; | |
1318 | ||
1319 | qemu_progress_init(progress, 2.0); | |
1320 | qemu_progress_print(0, 100); | |
1321 | ||
1322 | flags = BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0); | |
1323 | ret = set_cache_flag(cache, &flags); | |
1324 | if (ret < 0) { | |
1325 | error_report("Invalid cache option: %s", cache); | |
1326 | return -1; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * Open the images. | |
1331 | * | |
1332 | * Ignore the old backing file for unsafe rebase in case we want to correct | |
1333 | * the reference to a renamed or moved backing file. | |
1334 | */ | |
1335 | bs = bdrv_new_open(filename, fmt, flags); | |
1336 | if (!bs) { | |
1337 | return 1; | |
1338 | } | |
1339 | ||
1340 | /* Find the right drivers for the backing files */ | |
1341 | old_backing_drv = NULL; | |
1342 | new_backing_drv = NULL; | |
1343 | ||
1344 | if (!unsafe && bs->backing_format[0] != '\0') { | |
1345 | old_backing_drv = bdrv_find_format(bs->backing_format); | |
1346 | if (old_backing_drv == NULL) { | |
1347 | error_report("Invalid format name: '%s'", bs->backing_format); | |
1348 | ret = -1; | |
1349 | goto out; | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | if (out_basefmt != NULL) { | |
1354 | new_backing_drv = bdrv_find_format(out_basefmt); | |
1355 | if (new_backing_drv == NULL) { | |
1356 | error_report("Invalid format name: '%s'", out_basefmt); | |
1357 | ret = -1; | |
1358 | goto out; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | /* For safe rebasing we need to compare old and new backing file */ | |
1363 | if (unsafe) { | |
1364 | /* Make the compiler happy */ | |
1365 | bs_old_backing = NULL; | |
1366 | bs_new_backing = NULL; | |
1367 | } else { | |
1368 | char backing_name[1024]; | |
1369 | ||
1370 | bs_old_backing = bdrv_new("old_backing"); | |
1371 | bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); | |
1372 | ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, | |
1373 | old_backing_drv); | |
1374 | if (ret) { | |
1375 | error_report("Could not open old backing file '%s'", backing_name); | |
1376 | goto out; | |
1377 | } | |
1378 | ||
1379 | bs_new_backing = bdrv_new("new_backing"); | |
1380 | ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS, | |
1381 | new_backing_drv); | |
1382 | if (ret) { | |
1383 | error_report("Could not open new backing file '%s'", out_baseimg); | |
1384 | goto out; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | /* | |
1389 | * Check each unallocated cluster in the COW file. If it is unallocated, | |
1390 | * accesses go to the backing file. We must therefore compare this cluster | |
1391 | * in the old and new backing file, and if they differ we need to copy it | |
1392 | * from the old backing file into the COW file. | |
1393 | * | |
1394 | * If qemu-img crashes during this step, no harm is done. The content of | |
1395 | * the image is the same as the original one at any time. | |
1396 | */ | |
1397 | if (!unsafe) { | |
1398 | uint64_t num_sectors; | |
1399 | uint64_t sector; | |
1400 | int n; | |
1401 | uint8_t * buf_old; | |
1402 | uint8_t * buf_new; | |
1403 | float local_progress; | |
1404 | ||
1405 | buf_old = qemu_malloc(IO_BUF_SIZE); | |
1406 | buf_new = qemu_malloc(IO_BUF_SIZE); | |
1407 | ||
1408 | bdrv_get_geometry(bs, &num_sectors); | |
1409 | ||
1410 | local_progress = (float)100 / | |
1411 | (num_sectors / MIN(num_sectors, IO_BUF_SIZE / 512)); | |
1412 | for (sector = 0; sector < num_sectors; sector += n) { | |
1413 | ||
1414 | /* How many sectors can we handle with the next read? */ | |
1415 | if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { | |
1416 | n = (IO_BUF_SIZE / 512); | |
1417 | } else { | |
1418 | n = num_sectors - sector; | |
1419 | } | |
1420 | ||
1421 | /* If the cluster is allocated, we don't need to take action */ | |
1422 | ret = bdrv_is_allocated(bs, sector, n, &n); | |
1423 | if (ret) { | |
1424 | continue; | |
1425 | } | |
1426 | ||
1427 | /* Read old and new backing file */ | |
1428 | ret = bdrv_read(bs_old_backing, sector, buf_old, n); | |
1429 | if (ret < 0) { | |
1430 | error_report("error while reading from old backing file"); | |
1431 | goto out; | |
1432 | } | |
1433 | ret = bdrv_read(bs_new_backing, sector, buf_new, n); | |
1434 | if (ret < 0) { | |
1435 | error_report("error while reading from new backing file"); | |
1436 | goto out; | |
1437 | } | |
1438 | ||
1439 | /* If they differ, we need to write to the COW file */ | |
1440 | uint64_t written = 0; | |
1441 | ||
1442 | while (written < n) { | |
1443 | int pnum; | |
1444 | ||
1445 | if (compare_sectors(buf_old + written * 512, | |
1446 | buf_new + written * 512, n - written, &pnum)) | |
1447 | { | |
1448 | ret = bdrv_write(bs, sector + written, | |
1449 | buf_old + written * 512, pnum); | |
1450 | if (ret < 0) { | |
1451 | error_report("Error while writing to COW image: %s", | |
1452 | strerror(-ret)); | |
1453 | goto out; | |
1454 | } | |
1455 | } | |
1456 | ||
1457 | written += pnum; | |
1458 | } | |
1459 | qemu_progress_print(local_progress, 100); | |
1460 | } | |
1461 | ||
1462 | qemu_free(buf_old); | |
1463 | qemu_free(buf_new); | |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * Change the backing file. All clusters that are different from the old | |
1468 | * backing file are overwritten in the COW file now, so the visible content | |
1469 | * doesn't change when we switch the backing file. | |
1470 | */ | |
1471 | ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); | |
1472 | if (ret == -ENOSPC) { | |
1473 | error_report("Could not change the backing file to '%s': No " | |
1474 | "space left in the file header", out_baseimg); | |
1475 | } else if (ret < 0) { | |
1476 | error_report("Could not change the backing file to '%s': %s", | |
1477 | out_baseimg, strerror(-ret)); | |
1478 | } | |
1479 | ||
1480 | qemu_progress_print(100, 0); | |
1481 | /* | |
1482 | * TODO At this point it is possible to check if any clusters that are | |
1483 | * allocated in the COW file are the same in the backing file. If so, they | |
1484 | * could be dropped from the COW file. Don't do this before switching the | |
1485 | * backing file, in case of a crash this would lead to corruption. | |
1486 | */ | |
1487 | out: | |
1488 | qemu_progress_end(); | |
1489 | /* Cleanup */ | |
1490 | if (!unsafe) { | |
1491 | if (bs_old_backing != NULL) { | |
1492 | bdrv_delete(bs_old_backing); | |
1493 | } | |
1494 | if (bs_new_backing != NULL) { | |
1495 | bdrv_delete(bs_new_backing); | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | bdrv_delete(bs); | |
1500 | if (ret) { | |
1501 | return 1; | |
1502 | } | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | static int img_resize(int argc, char **argv) | |
1507 | { | |
1508 | int c, ret, relative; | |
1509 | const char *filename, *fmt, *size; | |
1510 | int64_t n, total_size; | |
1511 | BlockDriverState *bs = NULL; | |
1512 | QEMUOptionParameter *param; | |
1513 | QEMUOptionParameter resize_options[] = { | |
1514 | { | |
1515 | .name = BLOCK_OPT_SIZE, | |
1516 | .type = OPT_SIZE, | |
1517 | .help = "Virtual disk size" | |
1518 | }, | |
1519 | { NULL } | |
1520 | }; | |
1521 | ||
1522 | /* Remove size from argv manually so that negative numbers are not treated | |
1523 | * as options by getopt. */ | |
1524 | if (argc < 3) { | |
1525 | help(); | |
1526 | return 1; | |
1527 | } | |
1528 | ||
1529 | size = argv[--argc]; | |
1530 | ||
1531 | /* Parse getopt arguments */ | |
1532 | fmt = NULL; | |
1533 | for(;;) { | |
1534 | c = getopt(argc, argv, "f:h"); | |
1535 | if (c == -1) { | |
1536 | break; | |
1537 | } | |
1538 | switch(c) { | |
1539 | case '?': | |
1540 | case 'h': | |
1541 | help(); | |
1542 | break; | |
1543 | case 'f': | |
1544 | fmt = optarg; | |
1545 | break; | |
1546 | } | |
1547 | } | |
1548 | if (optind >= argc) { | |
1549 | help(); | |
1550 | } | |
1551 | filename = argv[optind++]; | |
1552 | ||
1553 | /* Choose grow, shrink, or absolute resize mode */ | |
1554 | switch (size[0]) { | |
1555 | case '+': | |
1556 | relative = 1; | |
1557 | size++; | |
1558 | break; | |
1559 | case '-': | |
1560 | relative = -1; | |
1561 | size++; | |
1562 | break; | |
1563 | default: | |
1564 | relative = 0; | |
1565 | break; | |
1566 | } | |
1567 | ||
1568 | /* Parse size */ | |
1569 | param = parse_option_parameters("", resize_options, NULL); | |
1570 | if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) { | |
1571 | /* Error message already printed when size parsing fails */ | |
1572 | ret = -1; | |
1573 | goto out; | |
1574 | } | |
1575 | n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n; | |
1576 | free_option_parameters(param); | |
1577 | ||
1578 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); | |
1579 | if (!bs) { | |
1580 | ret = -1; | |
1581 | goto out; | |
1582 | } | |
1583 | ||
1584 | if (relative) { | |
1585 | total_size = bdrv_getlength(bs) + n * relative; | |
1586 | } else { | |
1587 | total_size = n; | |
1588 | } | |
1589 | if (total_size <= 0) { | |
1590 | error_report("New image size must be positive"); | |
1591 | ret = -1; | |
1592 | goto out; | |
1593 | } | |
1594 | ||
1595 | ret = bdrv_truncate(bs, total_size); | |
1596 | switch (ret) { | |
1597 | case 0: | |
1598 | printf("Image resized.\n"); | |
1599 | break; | |
1600 | case -ENOTSUP: | |
1601 | error_report("This image format does not support resize"); | |
1602 | break; | |
1603 | case -EACCES: | |
1604 | error_report("Image is read-only"); | |
1605 | break; | |
1606 | default: | |
1607 | error_report("Error resizing image (%d)", -ret); | |
1608 | break; | |
1609 | } | |
1610 | out: | |
1611 | if (bs) { | |
1612 | bdrv_delete(bs); | |
1613 | } | |
1614 | if (ret) { | |
1615 | return 1; | |
1616 | } | |
1617 | return 0; | |
1618 | } | |
1619 | ||
1620 | static const img_cmd_t img_cmds[] = { | |
1621 | #define DEF(option, callback, arg_string) \ | |
1622 | { option, callback }, | |
1623 | #include "qemu-img-cmds.h" | |
1624 | #undef DEF | |
1625 | #undef GEN_DOCS | |
1626 | { NULL, NULL, }, | |
1627 | }; | |
1628 | ||
1629 | int main(int argc, char **argv) | |
1630 | { | |
1631 | const img_cmd_t *cmd; | |
1632 | const char *cmdname; | |
1633 | ||
1634 | error_set_progname(argv[0]); | |
1635 | ||
1636 | bdrv_init(); | |
1637 | if (argc < 2) | |
1638 | help(); | |
1639 | cmdname = argv[1]; | |
1640 | argc--; argv++; | |
1641 | ||
1642 | /* find the command */ | |
1643 | for(cmd = img_cmds; cmd->name != NULL; cmd++) { | |
1644 | if (!strcmp(cmdname, cmd->name)) { | |
1645 | return cmd->handler(argc, argv); | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | /* not found */ | |
1650 | help(); | |
1651 | return 0; | |
1652 | } |