]>
Commit | Line | Data |
---|---|---|
ea2384d3 | 1 | /* |
fb43f4dd | 2 | * QEMU disk image utility |
5fafdf24 | 3 | * |
68d0f70e | 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
5fafdf24 | 5 | * |
ea2384d3 FB |
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 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
9ea2ea71 | 25 | #include "qemu-option.h" |
f7b4a940 | 26 | #include "osdep.h" |
ec36ba14 | 27 | #include "block_int.h" |
9230eaf6 | 28 | #include <stdio.h> |
ea2384d3 | 29 | |
e8445331 FB |
30 | #ifdef _WIN32 |
31 | #include <windows.h> | |
32 | #endif | |
33 | ||
c227f099 | 34 | typedef struct img_cmd_t { |
153859be SB |
35 | const char *name; |
36 | int (*handler)(int argc, char **argv); | |
c227f099 | 37 | } img_cmd_t; |
153859be | 38 | |
137519ce AJ |
39 | /* Default to cache=writeback as data integrity is not important for qemu-tcg. */ |
40 | #define BRDV_O_FLAGS BDRV_O_CACHE_WB | |
41 | ||
a5e50b26 | 42 | static void QEMU_NORETURN error(const char *fmt, ...) |
ea2384d3 FB |
43 | { |
44 | va_list ap; | |
45 | va_start(ap, fmt); | |
57d1a2b6 | 46 | fprintf(stderr, "qemu-img: "); |
ea2384d3 FB |
47 | vfprintf(stderr, fmt, ap); |
48 | fprintf(stderr, "\n"); | |
49 | exit(1); | |
50 | va_end(ap); | |
51 | } | |
52 | ||
53 | static void format_print(void *opaque, const char *name) | |
54 | { | |
55 | printf(" %s", name); | |
56 | } | |
57 | ||
d2c639d6 | 58 | /* Please keep in synch with qemu-img.texi */ |
3f379ab1 | 59 | static void help(void) |
ea2384d3 | 60 | { |
e00291c0 PB |
61 | const char *help_msg = |
62 | "qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n" | |
3f020d70 | 63 | "usage: qemu-img command [command options]\n" |
64 | "QEMU disk image utility\n" | |
65 | "\n" | |
66 | "Command syntax:\n" | |
153859be SB |
67 | #define DEF(option, callback, arg_string) \ |
68 | " " arg_string "\n" | |
69 | #include "qemu-img-cmds.h" | |
70 | #undef DEF | |
71 | #undef GEN_DOCS | |
3f020d70 | 72 | "\n" |
73 | "Command parameters:\n" | |
74 | " 'filename' is a disk image filename\n" | |
75 | " 'fmt' is the disk image format. It is guessed automatically in most cases\n" | |
76 | " 'size' is the disk image size in bytes. Optional suffixes\n" | |
77 | " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n" | |
78 | " and T (terabyte, 1024G) are supported. 'b' is ignored.\n" | |
79 | " 'output_filename' is the destination disk image filename\n" | |
80 | " 'output_fmt' is the destination format\n" | |
81 | " 'options' is a comma separated list of format specific options in a\n" | |
82 | " name=value format. Use -o ? for an overview of the options supported by the\n" | |
83 | " used format\n" | |
84 | " '-c' indicates that target image must be compressed (qcow format only)\n" | |
85 | " '-u' enables unsafe rebasing. It is assumed that old and new backing file\n" | |
86 | " match exactly. The image doesn't need a working backing file before\n" | |
87 | " rebasing in this case (useful for renaming the backing file)\n" | |
88 | " '-h' with or without a command shows this help and lists the supported formats\n" | |
89 | "\n" | |
90 | "Parameters to snapshot subcommand:\n" | |
91 | " 'snapshot' is the name of the snapshot to create, apply or delete\n" | |
92 | " '-a' applies a snapshot (revert disk to saved state)\n" | |
93 | " '-c' creates a snapshot\n" | |
94 | " '-d' deletes a snapshot\n" | |
e00291c0 PB |
95 | " '-l' lists all snapshots in the given image\n"; |
96 | ||
97 | printf("%s\nSupported formats:", help_msg); | |
ea2384d3 FB |
98 | bdrv_iterate_format(format_print, NULL); |
99 | printf("\n"); | |
100 | exit(1); | |
101 | } | |
102 | ||
ea2384d3 FB |
103 | #if defined(WIN32) |
104 | /* XXX: put correct support for win32 */ | |
105 | static int read_password(char *buf, int buf_size) | |
106 | { | |
107 | int c, i; | |
108 | printf("Password: "); | |
109 | fflush(stdout); | |
110 | i = 0; | |
111 | for(;;) { | |
112 | c = getchar(); | |
113 | if (c == '\n') | |
114 | break; | |
115 | if (i < (buf_size - 1)) | |
116 | buf[i++] = c; | |
117 | } | |
118 | buf[i] = '\0'; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | #else | |
123 | ||
124 | #include <termios.h> | |
125 | ||
126 | static struct termios oldtty; | |
127 | ||
128 | static void term_exit(void) | |
129 | { | |
130 | tcsetattr (0, TCSANOW, &oldtty); | |
131 | } | |
132 | ||
133 | static void term_init(void) | |
134 | { | |
135 | struct termios tty; | |
136 | ||
137 | tcgetattr (0, &tty); | |
138 | oldtty = tty; | |
139 | ||
140 | tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP | |
141 | |INLCR|IGNCR|ICRNL|IXON); | |
142 | tty.c_oflag |= OPOST; | |
143 | tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); | |
144 | tty.c_cflag &= ~(CSIZE|PARENB); | |
145 | tty.c_cflag |= CS8; | |
146 | tty.c_cc[VMIN] = 1; | |
147 | tty.c_cc[VTIME] = 0; | |
3b46e624 | 148 | |
ea2384d3 FB |
149 | tcsetattr (0, TCSANOW, &tty); |
150 | ||
151 | atexit(term_exit); | |
152 | } | |
153 | ||
3f379ab1 | 154 | static int read_password(char *buf, int buf_size) |
ea2384d3 FB |
155 | { |
156 | uint8_t ch; | |
157 | int i, ret; | |
158 | ||
159 | printf("password: "); | |
160 | fflush(stdout); | |
161 | term_init(); | |
162 | i = 0; | |
163 | for(;;) { | |
164 | ret = read(0, &ch, 1); | |
165 | if (ret == -1) { | |
166 | if (errno == EAGAIN || errno == EINTR) { | |
167 | continue; | |
168 | } else { | |
169 | ret = -1; | |
170 | break; | |
171 | } | |
172 | } else if (ret == 0) { | |
173 | ret = -1; | |
174 | break; | |
175 | } else { | |
176 | if (ch == '\r') { | |
177 | ret = 0; | |
178 | break; | |
179 | } | |
180 | if (i < (buf_size - 1)) | |
181 | buf[i++] = ch; | |
182 | } | |
183 | } | |
184 | term_exit(); | |
185 | buf[i] = '\0'; | |
186 | printf("\n"); | |
187 | return ret; | |
188 | } | |
189 | #endif | |
190 | ||
75c23805 FB |
191 | static BlockDriverState *bdrv_new_open(const char *filename, |
192 | const char *fmt) | |
193 | { | |
194 | BlockDriverState *bs; | |
195 | BlockDriver *drv; | |
196 | char password[256]; | |
197 | ||
198 | bs = bdrv_new(""); | |
199 | if (!bs) | |
200 | error("Not enough memory"); | |
201 | if (fmt) { | |
202 | drv = bdrv_find_format(fmt); | |
203 | if (!drv) | |
204 | error("Unknown file format '%s'", fmt); | |
205 | } else { | |
206 | drv = NULL; | |
207 | } | |
f5edb014 | 208 | if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_RDWR, drv) < 0) { |
75c23805 FB |
209 | error("Could not open '%s'", filename); |
210 | } | |
211 | if (bdrv_is_encrypted(bs)) { | |
212 | printf("Disk image '%s' is encrypted.\n", filename); | |
213 | if (read_password(password, sizeof(password)) < 0) | |
214 | error("No password given"); | |
215 | if (bdrv_set_key(bs, password) < 0) | |
216 | error("invalid password"); | |
217 | } | |
218 | return bs; | |
219 | } | |
220 | ||
efa84d43 KW |
221 | static void add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
222 | int flags, const char *base_filename, const char *base_fmt) | |
223 | { | |
224 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
225 | if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) { | |
226 | error("Encryption not supported for file format '%s'", fmt); | |
227 | } | |
228 | } | |
229 | if (flags & BLOCK_FLAG_COMPAT6) { | |
230 | if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) { | |
231 | error("VMDK version 6 not supported for file format '%s'", fmt); | |
232 | } | |
233 | } | |
234 | ||
235 | if (base_filename) { | |
236 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) { | |
237 | error("Backing file not supported for file format '%s'", fmt); | |
238 | } | |
239 | } | |
240 | if (base_fmt) { | |
241 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
242 | error("Backing file format not supported for file format '%s'", fmt); | |
243 | } | |
244 | } | |
245 | } | |
246 | ||
ea2384d3 FB |
247 | static int img_create(int argc, char **argv) |
248 | { | |
ec36ba14 | 249 | int c, ret, flags; |
ea2384d3 | 250 | const char *fmt = "raw"; |
9230eaf6 | 251 | const char *base_fmt = NULL; |
ea2384d3 FB |
252 | const char *filename; |
253 | const char *base_filename = NULL; | |
ea2384d3 | 254 | BlockDriver *drv; |
9ea2ea71 KW |
255 | QEMUOptionParameter *param = NULL; |
256 | char *options = NULL; | |
3b46e624 | 257 | |
ec36ba14 | 258 | flags = 0; |
ea2384d3 | 259 | for(;;) { |
9ea2ea71 | 260 | c = getopt(argc, argv, "F:b:f:he6o:"); |
ea2384d3 FB |
261 | if (c == -1) |
262 | break; | |
263 | switch(c) { | |
264 | case 'h': | |
265 | help(); | |
266 | break; | |
9230eaf6 AL |
267 | case 'F': |
268 | base_fmt = optarg; | |
269 | break; | |
ea2384d3 FB |
270 | case 'b': |
271 | base_filename = optarg; | |
272 | break; | |
273 | case 'f': | |
274 | fmt = optarg; | |
275 | break; | |
276 | case 'e': | |
ec36ba14 | 277 | flags |= BLOCK_FLAG_ENCRYPT; |
ea2384d3 | 278 | break; |
d8871c5a | 279 | case '6': |
ec36ba14 | 280 | flags |= BLOCK_FLAG_COMPAT6; |
d8871c5a | 281 | break; |
9ea2ea71 KW |
282 | case 'o': |
283 | options = optarg; | |
284 | break; | |
ea2384d3 FB |
285 | } |
286 | } | |
9230eaf6 | 287 | |
9ea2ea71 KW |
288 | /* Find driver and parse its options */ |
289 | drv = bdrv_find_format(fmt); | |
290 | if (!drv) | |
291 | error("Unknown file format '%s'", fmt); | |
9230eaf6 | 292 | |
db08adf5 KW |
293 | if (options && !strcmp(options, "?")) { |
294 | print_option_help(drv->create_options); | |
295 | return 0; | |
296 | } | |
297 | ||
9f56640c KW |
298 | /* Create parameter list with default values */ |
299 | param = parse_option_parameters("", drv->create_options, param); | |
300 | set_option_parameter_int(param, BLOCK_OPT_SIZE, -1); | |
301 | ||
302 | /* Parse -o options */ | |
9ea2ea71 KW |
303 | if (options) { |
304 | param = parse_option_parameters(options, drv->create_options, param); | |
305 | if (param == NULL) { | |
306 | error("Invalid options for file format '%s'.", fmt); | |
307 | } | |
9ea2ea71 KW |
308 | } |
309 | ||
db08adf5 KW |
310 | /* Get the filename */ |
311 | if (optind >= argc) | |
312 | help(); | |
313 | filename = argv[optind++]; | |
314 | ||
9ea2ea71 KW |
315 | /* Add size to parameters */ |
316 | if (optind < argc) { | |
317 | set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]); | |
318 | } | |
319 | ||
320 | /* Add old-style options to parameters */ | |
efa84d43 | 321 | add_old_style_options(fmt, param, flags, base_filename, base_fmt); |
9ea2ea71 KW |
322 | |
323 | // The size for the image must always be specified, with one exception: | |
324 | // If we are using a backing file, we can obtain the size from there | |
9f56640c | 325 | if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { |
9ea2ea71 KW |
326 | |
327 | QEMUOptionParameter *backing_file = | |
328 | get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
329 | QEMUOptionParameter *backing_fmt = | |
330 | get_option_parameter(param, BLOCK_OPT_BACKING_FMT); | |
331 | ||
332 | if (backing_file && backing_file->value.s) { | |
333 | BlockDriverState *bs; | |
334 | uint64_t size; | |
335 | const char *fmt = NULL; | |
336 | char buf[32]; | |
337 | ||
338 | if (backing_fmt && backing_fmt->value.s) { | |
339 | if (bdrv_find_format(backing_fmt->value.s)) { | |
340 | fmt = backing_fmt->value.s; | |
341 | } else { | |
342 | error("Unknown backing file format '%s'", | |
343 | backing_fmt->value.s); | |
344 | } | |
345 | } | |
346 | ||
347 | bs = bdrv_new_open(backing_file->value.s, fmt); | |
348 | bdrv_get_geometry(bs, &size); | |
349 | size *= 512; | |
350 | bdrv_delete(bs); | |
351 | ||
352 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
353 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
354 | } else { | |
355 | error("Image creation needs a size parameter"); | |
356 | } | |
75c23805 | 357 | } |
9ea2ea71 KW |
358 | |
359 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
360 | print_option_parameters(param); | |
361 | puts(""); | |
362 | ||
363 | ret = bdrv_create(drv, filename, param); | |
364 | free_option_parameters(param); | |
365 | ||
ea2384d3 FB |
366 | if (ret < 0) { |
367 | if (ret == -ENOTSUP) { | |
3c56521b | 368 | error("Formatting or formatting option not supported for file format '%s'", fmt); |
6e9ea0c0 AJ |
369 | } else if (ret == -EFBIG) { |
370 | error("The image size is too large for file format '%s'", fmt); | |
ea2384d3 FB |
371 | } else { |
372 | error("Error while formatting"); | |
373 | } | |
374 | } | |
375 | return 0; | |
376 | } | |
377 | ||
1585969c AL |
378 | static int img_check(int argc, char **argv) |
379 | { | |
380 | int c, ret; | |
381 | const char *filename, *fmt; | |
382 | BlockDriver *drv; | |
383 | BlockDriverState *bs; | |
384 | ||
385 | fmt = NULL; | |
386 | for(;;) { | |
387 | c = getopt(argc, argv, "f:h"); | |
388 | if (c == -1) | |
389 | break; | |
390 | switch(c) { | |
391 | case 'h': | |
392 | help(); | |
393 | break; | |
394 | case 'f': | |
395 | fmt = optarg; | |
396 | break; | |
397 | } | |
398 | } | |
399 | if (optind >= argc) | |
400 | help(); | |
401 | filename = argv[optind++]; | |
402 | ||
403 | bs = bdrv_new(""); | |
404 | if (!bs) | |
405 | error("Not enough memory"); | |
406 | if (fmt) { | |
407 | drv = bdrv_find_format(fmt); | |
408 | if (!drv) | |
409 | error("Unknown file format '%s'", fmt); | |
410 | } else { | |
411 | drv = NULL; | |
412 | } | |
413 | if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) { | |
414 | error("Could not open '%s'", filename); | |
415 | } | |
416 | ret = bdrv_check(bs); | |
417 | switch(ret) { | |
418 | case 0: | |
419 | printf("No errors were found on the image.\n"); | |
420 | break; | |
421 | case -ENOTSUP: | |
422 | error("This image format does not support checks"); | |
423 | break; | |
424 | default: | |
425 | if (ret < 0) { | |
426 | error("An error occurred during the check"); | |
427 | } else { | |
428 | printf("%d errors were found on the image.\n", ret); | |
429 | } | |
430 | break; | |
431 | } | |
432 | ||
433 | bdrv_delete(bs); | |
434 | return 0; | |
435 | } | |
436 | ||
ea2384d3 FB |
437 | static int img_commit(int argc, char **argv) |
438 | { | |
439 | int c, ret; | |
440 | const char *filename, *fmt; | |
441 | BlockDriver *drv; | |
442 | BlockDriverState *bs; | |
443 | ||
444 | fmt = NULL; | |
445 | for(;;) { | |
446 | c = getopt(argc, argv, "f:h"); | |
447 | if (c == -1) | |
448 | break; | |
449 | switch(c) { | |
450 | case 'h': | |
451 | help(); | |
452 | break; | |
453 | case 'f': | |
454 | fmt = optarg; | |
455 | break; | |
456 | } | |
457 | } | |
5fafdf24 | 458 | if (optind >= argc) |
ea2384d3 FB |
459 | help(); |
460 | filename = argv[optind++]; | |
461 | ||
462 | bs = bdrv_new(""); | |
463 | if (!bs) | |
464 | error("Not enough memory"); | |
465 | if (fmt) { | |
466 | drv = bdrv_find_format(fmt); | |
467 | if (!drv) | |
468 | error("Unknown file format '%s'", fmt); | |
469 | } else { | |
470 | drv = NULL; | |
471 | } | |
f5edb014 | 472 | if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_RDWR, drv) < 0) { |
ea2384d3 FB |
473 | error("Could not open '%s'", filename); |
474 | } | |
475 | ret = bdrv_commit(bs); | |
476 | switch(ret) { | |
477 | case 0: | |
478 | printf("Image committed.\n"); | |
479 | break; | |
480 | case -ENOENT: | |
481 | error("No disk inserted"); | |
482 | break; | |
483 | case -EACCES: | |
484 | error("Image is read-only"); | |
485 | break; | |
486 | case -ENOTSUP: | |
487 | error("Image is already committed"); | |
488 | break; | |
489 | default: | |
490 | error("Error while committing image"); | |
491 | break; | |
492 | } | |
493 | ||
494 | bdrv_delete(bs); | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static int is_not_zero(const uint8_t *sector, int len) | |
499 | { | |
500 | int i; | |
501 | len >>= 2; | |
502 | for(i = 0;i < len; i++) { | |
503 | if (((uint32_t *)sector)[i] != 0) | |
504 | return 1; | |
505 | } | |
506 | return 0; | |
507 | } | |
508 | ||
f58c7b35 TS |
509 | /* |
510 | * Returns true iff the first sector pointed to by 'buf' contains at least | |
511 | * a non-NUL byte. | |
512 | * | |
513 | * 'pnum' is set to the number of sectors (including and immediately following | |
514 | * the first one) that are known to be in the same allocated/unallocated state. | |
515 | */ | |
ea2384d3 FB |
516 | static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
517 | { | |
518 | int v, i; | |
519 | ||
520 | if (n <= 0) { | |
521 | *pnum = 0; | |
522 | return 0; | |
523 | } | |
524 | v = is_not_zero(buf, 512); | |
525 | for(i = 1; i < n; i++) { | |
526 | buf += 512; | |
527 | if (v != is_not_zero(buf, 512)) | |
528 | break; | |
529 | } | |
530 | *pnum = i; | |
531 | return v; | |
532 | } | |
533 | ||
3e85c6fd KW |
534 | /* |
535 | * Compares two buffers sector by sector. Returns 0 if the first sector of both | |
536 | * buffers matches, non-zero otherwise. | |
537 | * | |
538 | * pnum is set to the number of sectors (including and immediately following | |
539 | * the first one) that are known to have the same comparison result | |
540 | */ | |
541 | static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, | |
542 | int *pnum) | |
543 | { | |
544 | int res, i; | |
545 | ||
546 | if (n <= 0) { | |
547 | *pnum = 0; | |
548 | return 0; | |
549 | } | |
550 | ||
551 | res = !!memcmp(buf1, buf2, 512); | |
552 | for(i = 1; i < n; i++) { | |
553 | buf1 += 512; | |
554 | buf2 += 512; | |
555 | ||
556 | if (!!memcmp(buf1, buf2, 512) != res) { | |
557 | break; | |
558 | } | |
559 | } | |
560 | ||
561 | *pnum = i; | |
562 | return res; | |
563 | } | |
564 | ||
80ee15a6 | 565 | #define IO_BUF_SIZE (2 * 1024 * 1024) |
ea2384d3 FB |
566 | |
567 | static int img_convert(int argc, char **argv) | |
568 | { | |
926c2d23 | 569 | int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors; |
f58c7b35 | 570 | const char *fmt, *out_fmt, *out_baseimg, *out_filename; |
ea2384d3 | 571 | BlockDriver *drv; |
926c2d23 | 572 | BlockDriverState **bs, *out_bs; |
96b8f136 TS |
573 | int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
574 | uint64_t bs_sectors; | |
ea2384d3 FB |
575 | uint8_t buf[IO_BUF_SIZE]; |
576 | const uint8_t *buf1; | |
faea38e7 | 577 | BlockDriverInfo bdi; |
efa84d43 KW |
578 | QEMUOptionParameter *param = NULL; |
579 | char *options = NULL; | |
ea2384d3 FB |
580 | |
581 | fmt = NULL; | |
582 | out_fmt = "raw"; | |
f58c7b35 | 583 | out_baseimg = NULL; |
ec36ba14 | 584 | flags = 0; |
ea2384d3 | 585 | for(;;) { |
efa84d43 | 586 | c = getopt(argc, argv, "f:O:B:hce6o:"); |
ea2384d3 FB |
587 | if (c == -1) |
588 | break; | |
589 | switch(c) { | |
590 | case 'h': | |
591 | help(); | |
592 | break; | |
593 | case 'f': | |
594 | fmt = optarg; | |
595 | break; | |
596 | case 'O': | |
597 | out_fmt = optarg; | |
598 | break; | |
f58c7b35 TS |
599 | case 'B': |
600 | out_baseimg = optarg; | |
601 | break; | |
ea2384d3 | 602 | case 'c': |
ec36ba14 | 603 | flags |= BLOCK_FLAG_COMPRESS; |
ea2384d3 FB |
604 | break; |
605 | case 'e': | |
ec36ba14 TS |
606 | flags |= BLOCK_FLAG_ENCRYPT; |
607 | break; | |
608 | case '6': | |
609 | flags |= BLOCK_FLAG_COMPAT6; | |
ea2384d3 | 610 | break; |
efa84d43 KW |
611 | case 'o': |
612 | options = optarg; | |
613 | break; | |
ea2384d3 FB |
614 | } |
615 | } | |
3b46e624 | 616 | |
926c2d23 AZ |
617 | bs_n = argc - optind - 1; |
618 | if (bs_n < 1) help(); | |
619 | ||
620 | out_filename = argv[argc - 1]; | |
f58c7b35 TS |
621 | |
622 | if (bs_n > 1 && out_baseimg) | |
623 | error("-B makes no sense when concatenating multiple input images"); | |
926c2d23 AZ |
624 | |
625 | bs = calloc(bs_n, sizeof(BlockDriverState *)); | |
626 | if (!bs) | |
627 | error("Out of memory"); | |
628 | ||
629 | total_sectors = 0; | |
630 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
631 | bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt); | |
632 | if (!bs[bs_i]) | |
633 | error("Could not open '%s'", argv[optind + bs_i]); | |
634 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
635 | total_sectors += bs_sectors; | |
636 | } | |
ea2384d3 | 637 | |
efa84d43 | 638 | /* Find driver and parse its options */ |
ea2384d3 FB |
639 | drv = bdrv_find_format(out_fmt); |
640 | if (!drv) | |
d34dda5e | 641 | error("Unknown file format '%s'", out_fmt); |
efa84d43 | 642 | |
db08adf5 KW |
643 | if (options && !strcmp(options, "?")) { |
644 | print_option_help(drv->create_options); | |
7078dead | 645 | free(bs); |
db08adf5 KW |
646 | return 0; |
647 | } | |
648 | ||
efa84d43 KW |
649 | if (options) { |
650 | param = parse_option_parameters(options, drv->create_options, param); | |
651 | if (param == NULL) { | |
652 | error("Invalid options for file format '%s'.", out_fmt); | |
653 | } | |
654 | } else { | |
655 | param = parse_option_parameters("", drv->create_options, param); | |
656 | } | |
657 | ||
658 | set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512); | |
659 | add_old_style_options(out_fmt, param, flags, out_baseimg, NULL); | |
660 | ||
661 | /* Check if compression is supported */ | |
662 | if (flags & BLOCK_FLAG_COMPRESS) { | |
663 | QEMUOptionParameter *encryption = | |
664 | get_option_parameter(param, BLOCK_OPT_ENCRYPT); | |
665 | ||
666 | if (!drv->bdrv_write_compressed) { | |
667 | error("Compression not supported for this file format"); | |
668 | } | |
669 | ||
670 | if (encryption && encryption->value.n) { | |
671 | error("Compression and encryption not supported at the same time"); | |
672 | } | |
673 | } | |
674 | ||
675 | /* Create the new image */ | |
676 | ret = bdrv_create(drv, out_filename, param); | |
677 | free_option_parameters(param); | |
678 | ||
ea2384d3 FB |
679 | if (ret < 0) { |
680 | if (ret == -ENOTSUP) { | |
93c65b47 | 681 | error("Formatting not supported for file format '%s'", out_fmt); |
6e9ea0c0 AJ |
682 | } else if (ret == -EFBIG) { |
683 | error("The image size is too large for file format '%s'", out_fmt); | |
ea2384d3 FB |
684 | } else { |
685 | error("Error while formatting '%s'", out_filename); | |
686 | } | |
687 | } | |
3b46e624 | 688 | |
ea2384d3 FB |
689 | out_bs = bdrv_new_open(out_filename, out_fmt); |
690 | ||
926c2d23 AZ |
691 | bs_i = 0; |
692 | bs_offset = 0; | |
693 | bdrv_get_geometry(bs[0], &bs_sectors); | |
694 | ||
695 | if (flags & BLOCK_FLAG_COMPRESS) { | |
faea38e7 FB |
696 | if (bdrv_get_info(out_bs, &bdi) < 0) |
697 | error("could not get block driver info"); | |
698 | cluster_size = bdi.cluster_size; | |
ea2384d3 FB |
699 | if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) |
700 | error("invalid cluster size"); | |
701 | cluster_sectors = cluster_size >> 9; | |
702 | sector_num = 0; | |
703 | for(;;) { | |
926c2d23 AZ |
704 | int64_t bs_num; |
705 | int remainder; | |
706 | uint8_t *buf2; | |
707 | ||
ea2384d3 FB |
708 | nb_sectors = total_sectors - sector_num; |
709 | if (nb_sectors <= 0) | |
710 | break; | |
711 | if (nb_sectors >= cluster_sectors) | |
712 | n = cluster_sectors; | |
713 | else | |
714 | n = nb_sectors; | |
926c2d23 AZ |
715 | |
716 | bs_num = sector_num - bs_offset; | |
717 | assert (bs_num >= 0); | |
718 | remainder = n; | |
719 | buf2 = buf; | |
720 | while (remainder > 0) { | |
721 | int nlow; | |
722 | while (bs_num == bs_sectors) { | |
723 | bs_i++; | |
724 | assert (bs_i < bs_n); | |
725 | bs_offset += bs_sectors; | |
726 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
727 | bs_num = 0; | |
728 | /* printf("changing part: sector_num=%lld, " | |
729 | "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n", | |
730 | sector_num, bs_i, bs_offset, bs_sectors); */ | |
731 | } | |
732 | assert (bs_num < bs_sectors); | |
733 | ||
734 | nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; | |
735 | ||
736 | if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0) | |
737 | error("error while reading"); | |
738 | ||
739 | buf2 += nlow * 512; | |
740 | bs_num += nlow; | |
741 | ||
742 | remainder -= nlow; | |
743 | } | |
744 | assert (remainder == 0); | |
745 | ||
ea2384d3 FB |
746 | if (n < cluster_sectors) |
747 | memset(buf + n * 512, 0, cluster_size - n * 512); | |
748 | if (is_not_zero(buf, cluster_size)) { | |
5fafdf24 | 749 | if (bdrv_write_compressed(out_bs, sector_num, buf, |
faea38e7 | 750 | cluster_sectors) != 0) |
ec3757de FB |
751 | error("error while compressing sector %" PRId64, |
752 | sector_num); | |
ea2384d3 FB |
753 | } |
754 | sector_num += n; | |
755 | } | |
faea38e7 FB |
756 | /* signal EOF to align */ |
757 | bdrv_write_compressed(out_bs, 0, NULL, 0); | |
ea2384d3 | 758 | } else { |
f58c7b35 | 759 | sector_num = 0; // total number of sectors converted so far |
ea2384d3 FB |
760 | for(;;) { |
761 | nb_sectors = total_sectors - sector_num; | |
762 | if (nb_sectors <= 0) | |
763 | break; | |
764 | if (nb_sectors >= (IO_BUF_SIZE / 512)) | |
765 | n = (IO_BUF_SIZE / 512); | |
766 | else | |
767 | n = nb_sectors; | |
926c2d23 AZ |
768 | |
769 | while (sector_num - bs_offset >= bs_sectors) { | |
770 | bs_i ++; | |
771 | assert (bs_i < bs_n); | |
772 | bs_offset += bs_sectors; | |
773 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
774 | /* printf("changing part: sector_num=%lld, bs_i=%d, " | |
775 | "bs_offset=%lld, bs_sectors=%lld\n", | |
776 | sector_num, bs_i, bs_offset, bs_sectors); */ | |
777 | } | |
778 | ||
779 | if (n > bs_offset + bs_sectors - sector_num) | |
780 | n = bs_offset + bs_sectors - sector_num; | |
781 | ||
12c09b8c | 782 | if (!drv->no_zero_init) { |
d032044f AS |
783 | /* If the output image is being created as a copy on write image, |
784 | assume that sectors which are unallocated in the input image | |
785 | are present in both the output's and input's base images (no | |
786 | need to copy them). */ | |
787 | if (out_baseimg) { | |
788 | if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, | |
789 | n, &n1)) { | |
790 | sector_num += n1; | |
791 | continue; | |
792 | } | |
793 | /* The next 'n1' sectors are allocated in the input image. Copy | |
794 | only those as they may be followed by unallocated sectors. */ | |
795 | n = n1; | |
93c65b47 | 796 | } |
93c65b47 AL |
797 | } else { |
798 | n1 = n; | |
f58c7b35 TS |
799 | } |
800 | ||
926c2d23 | 801 | if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) |
ea2384d3 FB |
802 | error("error while reading"); |
803 | /* NOTE: at the same time we convert, we do not write zero | |
804 | sectors to have a chance to compress the image. Ideally, we | |
805 | should add a specific call to have the info to go faster */ | |
806 | buf1 = buf; | |
807 | while (n > 0) { | |
f58c7b35 TS |
808 | /* If the output image is being created as a copy on write image, |
809 | copy all sectors even the ones containing only NUL bytes, | |
93c65b47 AL |
810 | because they may differ from the sectors in the base image. |
811 | ||
812 | If the output is to a host device, we also write out | |
813 | sectors that are entirely 0, since whatever data was | |
814 | already there is garbage, not 0s. */ | |
12c09b8c | 815 | if (drv->no_zero_init || out_baseimg || |
93c65b47 | 816 | is_allocated_sectors(buf1, n, &n1)) { |
5fafdf24 | 817 | if (bdrv_write(out_bs, sector_num, buf1, n1) < 0) |
ea2384d3 FB |
818 | error("error while writing"); |
819 | } | |
820 | sector_num += n1; | |
821 | n -= n1; | |
822 | buf1 += n1 * 512; | |
823 | } | |
824 | } | |
825 | } | |
826 | bdrv_delete(out_bs); | |
926c2d23 AZ |
827 | for (bs_i = 0; bs_i < bs_n; bs_i++) |
828 | bdrv_delete(bs[bs_i]); | |
829 | free(bs); | |
ea2384d3 FB |
830 | return 0; |
831 | } | |
832 | ||
57d1a2b6 FB |
833 | #ifdef _WIN32 |
834 | static int64_t get_allocated_file_size(const char *filename) | |
835 | { | |
e8445331 FB |
836 | typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
837 | get_compressed_t get_compressed; | |
57d1a2b6 | 838 | struct _stati64 st; |
e8445331 FB |
839 | |
840 | /* WinNT support GetCompressedFileSize to determine allocate size */ | |
841 | get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); | |
842 | if (get_compressed) { | |
843 | DWORD high, low; | |
844 | low = get_compressed(filename, &high); | |
845 | if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) | |
846 | return (((int64_t) high) << 32) + low; | |
847 | } | |
848 | ||
5fafdf24 | 849 | if (_stati64(filename, &st) < 0) |
57d1a2b6 FB |
850 | return -1; |
851 | return st.st_size; | |
852 | } | |
853 | #else | |
854 | static int64_t get_allocated_file_size(const char *filename) | |
855 | { | |
856 | struct stat st; | |
5fafdf24 | 857 | if (stat(filename, &st) < 0) |
57d1a2b6 FB |
858 | return -1; |
859 | return (int64_t)st.st_blocks * 512; | |
860 | } | |
861 | #endif | |
862 | ||
faea38e7 FB |
863 | static void dump_snapshots(BlockDriverState *bs) |
864 | { | |
865 | QEMUSnapshotInfo *sn_tab, *sn; | |
866 | int nb_sns, i; | |
867 | char buf[256]; | |
868 | ||
869 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
870 | if (nb_sns <= 0) | |
871 | return; | |
872 | printf("Snapshot list:\n"); | |
873 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); | |
874 | for(i = 0; i < nb_sns; i++) { | |
875 | sn = &sn_tab[i]; | |
876 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); | |
877 | } | |
878 | qemu_free(sn_tab); | |
879 | } | |
880 | ||
ea2384d3 FB |
881 | static int img_info(int argc, char **argv) |
882 | { | |
883 | int c; | |
884 | const char *filename, *fmt; | |
885 | BlockDriver *drv; | |
886 | BlockDriverState *bs; | |
887 | char fmt_name[128], size_buf[128], dsize_buf[128]; | |
96b8f136 TS |
888 | uint64_t total_sectors; |
889 | int64_t allocated_size; | |
93b6b2a3 FB |
890 | char backing_filename[1024]; |
891 | char backing_filename2[1024]; | |
faea38e7 | 892 | BlockDriverInfo bdi; |
ea2384d3 FB |
893 | |
894 | fmt = NULL; | |
895 | for(;;) { | |
896 | c = getopt(argc, argv, "f:h"); | |
897 | if (c == -1) | |
898 | break; | |
899 | switch(c) { | |
900 | case 'h': | |
901 | help(); | |
902 | break; | |
903 | case 'f': | |
904 | fmt = optarg; | |
905 | break; | |
906 | } | |
907 | } | |
5fafdf24 | 908 | if (optind >= argc) |
ea2384d3 FB |
909 | help(); |
910 | filename = argv[optind++]; | |
911 | ||
912 | bs = bdrv_new(""); | |
913 | if (!bs) | |
914 | error("Not enough memory"); | |
915 | if (fmt) { | |
916 | drv = bdrv_find_format(fmt); | |
917 | if (!drv) | |
918 | error("Unknown file format '%s'", fmt); | |
919 | } else { | |
920 | drv = NULL; | |
921 | } | |
b783e409 | 922 | if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_NO_BACKING, drv) < 0) { |
ea2384d3 FB |
923 | error("Could not open '%s'", filename); |
924 | } | |
925 | bdrv_get_format(bs, fmt_name, sizeof(fmt_name)); | |
926 | bdrv_get_geometry(bs, &total_sectors); | |
927 | get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); | |
57d1a2b6 FB |
928 | allocated_size = get_allocated_file_size(filename); |
929 | if (allocated_size < 0) | |
a10ea30b | 930 | snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
de167e41 | 931 | else |
5fafdf24 | 932 | get_human_readable_size(dsize_buf, sizeof(dsize_buf), |
de167e41 | 933 | allocated_size); |
ea2384d3 FB |
934 | printf("image: %s\n" |
935 | "file format: %s\n" | |
ec3757de | 936 | "virtual size: %s (%" PRId64 " bytes)\n" |
ea2384d3 | 937 | "disk size: %s\n", |
5fafdf24 | 938 | filename, fmt_name, size_buf, |
ec3757de | 939 | (total_sectors * 512), |
ea2384d3 FB |
940 | dsize_buf); |
941 | if (bdrv_is_encrypted(bs)) | |
942 | printf("encrypted: yes\n"); | |
faea38e7 | 943 | if (bdrv_get_info(bs, &bdi) >= 0) { |
5fafdf24 | 944 | if (bdi.cluster_size != 0) |
faea38e7 FB |
945 | printf("cluster_size: %d\n", bdi.cluster_size); |
946 | } | |
93b6b2a3 | 947 | bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename)); |
faea38e7 | 948 | if (backing_filename[0] != '\0') { |
93b6b2a3 FB |
949 | path_combine(backing_filename2, sizeof(backing_filename2), |
950 | filename, backing_filename); | |
5fafdf24 | 951 | printf("backing file: %s (actual path: %s)\n", |
93b6b2a3 FB |
952 | backing_filename, |
953 | backing_filename2); | |
faea38e7 FB |
954 | } |
955 | dump_snapshots(bs); | |
ea2384d3 FB |
956 | bdrv_delete(bs); |
957 | return 0; | |
958 | } | |
959 | ||
f7b4a940 AL |
960 | #define SNAPSHOT_LIST 1 |
961 | #define SNAPSHOT_CREATE 2 | |
962 | #define SNAPSHOT_APPLY 3 | |
963 | #define SNAPSHOT_DELETE 4 | |
964 | ||
153859be | 965 | static int img_snapshot(int argc, char **argv) |
f7b4a940 AL |
966 | { |
967 | BlockDriverState *bs; | |
968 | QEMUSnapshotInfo sn; | |
969 | char *filename, *snapshot_name = NULL; | |
f5edb014 | 970 | int c, ret, bdrv_oflags; |
f7b4a940 AL |
971 | int action = 0; |
972 | qemu_timeval tv; | |
973 | ||
f5edb014 | 974 | bdrv_oflags = BDRV_O_RDWR; |
f7b4a940 AL |
975 | /* Parse commandline parameters */ |
976 | for(;;) { | |
977 | c = getopt(argc, argv, "la:c:d:h"); | |
978 | if (c == -1) | |
979 | break; | |
980 | switch(c) { | |
981 | case 'h': | |
982 | help(); | |
153859be | 983 | return 0; |
f7b4a940 AL |
984 | case 'l': |
985 | if (action) { | |
986 | help(); | |
153859be | 987 | return 0; |
f7b4a940 AL |
988 | } |
989 | action = SNAPSHOT_LIST; | |
f5edb014 | 990 | bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */ |
f7b4a940 AL |
991 | break; |
992 | case 'a': | |
993 | if (action) { | |
994 | help(); | |
153859be | 995 | return 0; |
f7b4a940 AL |
996 | } |
997 | action = SNAPSHOT_APPLY; | |
998 | snapshot_name = optarg; | |
999 | break; | |
1000 | case 'c': | |
1001 | if (action) { | |
1002 | help(); | |
153859be | 1003 | return 0; |
f7b4a940 AL |
1004 | } |
1005 | action = SNAPSHOT_CREATE; | |
1006 | snapshot_name = optarg; | |
1007 | break; | |
1008 | case 'd': | |
1009 | if (action) { | |
1010 | help(); | |
153859be | 1011 | return 0; |
f7b4a940 AL |
1012 | } |
1013 | action = SNAPSHOT_DELETE; | |
1014 | snapshot_name = optarg; | |
1015 | break; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | if (optind >= argc) | |
1020 | help(); | |
1021 | filename = argv[optind++]; | |
1022 | ||
1023 | /* Open the image */ | |
1024 | bs = bdrv_new(""); | |
1025 | if (!bs) | |
1026 | error("Not enough memory"); | |
1027 | ||
f5edb014 | 1028 | if (bdrv_open2(bs, filename, bdrv_oflags, NULL) < 0) { |
f7b4a940 AL |
1029 | error("Could not open '%s'", filename); |
1030 | } | |
1031 | ||
1032 | /* Perform the requested action */ | |
1033 | switch(action) { | |
1034 | case SNAPSHOT_LIST: | |
1035 | dump_snapshots(bs); | |
1036 | break; | |
1037 | ||
1038 | case SNAPSHOT_CREATE: | |
1039 | memset(&sn, 0, sizeof(sn)); | |
1040 | pstrcpy(sn.name, sizeof(sn.name), snapshot_name); | |
1041 | ||
1042 | qemu_gettimeofday(&tv); | |
1043 | sn.date_sec = tv.tv_sec; | |
1044 | sn.date_nsec = tv.tv_usec * 1000; | |
1045 | ||
1046 | ret = bdrv_snapshot_create(bs, &sn); | |
1047 | if (ret) | |
1048 | error("Could not create snapshot '%s': %d (%s)", | |
1049 | snapshot_name, ret, strerror(-ret)); | |
1050 | break; | |
1051 | ||
1052 | case SNAPSHOT_APPLY: | |
1053 | ret = bdrv_snapshot_goto(bs, snapshot_name); | |
1054 | if (ret) | |
1055 | error("Could not apply snapshot '%s': %d (%s)", | |
1056 | snapshot_name, ret, strerror(-ret)); | |
1057 | break; | |
1058 | ||
1059 | case SNAPSHOT_DELETE: | |
1060 | ret = bdrv_snapshot_delete(bs, snapshot_name); | |
1061 | if (ret) | |
1062 | error("Could not delete snapshot '%s': %d (%s)", | |
1063 | snapshot_name, ret, strerror(-ret)); | |
1064 | break; | |
1065 | } | |
1066 | ||
1067 | /* Cleanup */ | |
1068 | bdrv_delete(bs); | |
153859be SB |
1069 | |
1070 | return 0; | |
f7b4a940 AL |
1071 | } |
1072 | ||
3e85c6fd KW |
1073 | static int img_rebase(int argc, char **argv) |
1074 | { | |
1075 | BlockDriverState *bs, *bs_old_backing, *bs_new_backing; | |
1076 | BlockDriver *old_backing_drv, *new_backing_drv; | |
1077 | char *filename; | |
1078 | const char *out_basefmt, *out_baseimg; | |
1079 | int c, flags, ret; | |
1080 | int unsafe = 0; | |
1081 | ||
1082 | /* Parse commandline parameters */ | |
1083 | out_baseimg = NULL; | |
1084 | out_basefmt = NULL; | |
1085 | ||
1086 | for(;;) { | |
1087 | c = getopt(argc, argv, "uhF:b:"); | |
1088 | if (c == -1) | |
1089 | break; | |
1090 | switch(c) { | |
1091 | case 'h': | |
1092 | help(); | |
1093 | return 0; | |
1094 | case 'F': | |
1095 | out_basefmt = optarg; | |
1096 | break; | |
1097 | case 'b': | |
1098 | out_baseimg = optarg; | |
1099 | break; | |
1100 | case 'u': | |
1101 | unsafe = 1; | |
1102 | break; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | if ((optind >= argc) || !out_baseimg) | |
1107 | help(); | |
1108 | filename = argv[optind++]; | |
1109 | ||
1110 | /* | |
1111 | * Open the images. | |
1112 | * | |
1113 | * Ignore the old backing file for unsafe rebase in case we want to correct | |
1114 | * the reference to a renamed or moved backing file. | |
1115 | */ | |
1116 | bs = bdrv_new(""); | |
1117 | if (!bs) | |
1118 | error("Not enough memory"); | |
1119 | ||
058fc8c7 | 1120 | flags = BRDV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0); |
3e85c6fd KW |
1121 | if (bdrv_open2(bs, filename, flags, NULL) < 0) { |
1122 | error("Could not open '%s'", filename); | |
1123 | } | |
1124 | ||
1125 | /* Find the right drivers for the backing files */ | |
1126 | old_backing_drv = NULL; | |
1127 | new_backing_drv = NULL; | |
1128 | ||
1129 | if (!unsafe && bs->backing_format[0] != '\0') { | |
1130 | old_backing_drv = bdrv_find_format(bs->backing_format); | |
1131 | if (old_backing_drv == NULL) { | |
1132 | error("Invalid format name: '%s'", bs->backing_format); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | if (out_basefmt != NULL) { | |
1137 | new_backing_drv = bdrv_find_format(out_basefmt); | |
1138 | if (new_backing_drv == NULL) { | |
1139 | error("Invalid format name: '%s'", out_basefmt); | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | /* For safe rebasing we need to compare old and new backing file */ | |
1144 | if (unsafe) { | |
1145 | /* Make the compiler happy */ | |
1146 | bs_old_backing = NULL; | |
1147 | bs_new_backing = NULL; | |
1148 | } else { | |
1149 | char backing_name[1024]; | |
1150 | ||
1151 | bs_old_backing = bdrv_new("old_backing"); | |
1152 | bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); | |
1153 | if (bdrv_open2(bs_old_backing, backing_name, BRDV_O_FLAGS, | |
1154 | old_backing_drv)) | |
1155 | { | |
1156 | error("Could not open old backing file '%s'", backing_name); | |
1157 | return -1; | |
1158 | } | |
1159 | ||
1160 | bs_new_backing = bdrv_new("new_backing"); | |
058fc8c7 | 1161 | if (bdrv_open2(bs_new_backing, out_baseimg, BRDV_O_FLAGS | BDRV_O_RDWR, |
3e85c6fd KW |
1162 | new_backing_drv)) |
1163 | { | |
1164 | error("Could not open new backing file '%s'", backing_name); | |
1165 | return -1; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * Check each unallocated cluster in the COW file. If it is unallocated, | |
1171 | * accesses go to the backing file. We must therefore compare this cluster | |
1172 | * in the old and new backing file, and if they differ we need to copy it | |
1173 | * from the old backing file into the COW file. | |
1174 | * | |
1175 | * If qemu-img crashes during this step, no harm is done. The content of | |
1176 | * the image is the same as the original one at any time. | |
1177 | */ | |
1178 | if (!unsafe) { | |
1179 | uint64_t num_sectors; | |
1180 | uint64_t sector; | |
1181 | int n, n1; | |
1182 | uint8_t buf_old[IO_BUF_SIZE]; | |
1183 | uint8_t buf_new[IO_BUF_SIZE]; | |
1184 | ||
1185 | bdrv_get_geometry(bs, &num_sectors); | |
1186 | ||
1187 | for (sector = 0; sector < num_sectors; sector += n) { | |
1188 | ||
1189 | /* How many sectors can we handle with the next read? */ | |
1190 | if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { | |
1191 | n = (IO_BUF_SIZE / 512); | |
1192 | } else { | |
1193 | n = num_sectors - sector; | |
1194 | } | |
1195 | ||
1196 | /* If the cluster is allocated, we don't need to take action */ | |
1197 | if (bdrv_is_allocated(bs, sector, n, &n1)) { | |
1198 | n = n1; | |
1199 | continue; | |
1200 | } | |
1201 | ||
1202 | /* Read old and new backing file */ | |
1203 | if (bdrv_read(bs_old_backing, sector, buf_old, n) < 0) { | |
1204 | error("error while reading from old backing file"); | |
1205 | } | |
1206 | if (bdrv_read(bs_new_backing, sector, buf_new, n) < 0) { | |
1207 | error("error while reading from new backing file"); | |
1208 | } | |
1209 | ||
1210 | /* If they differ, we need to write to the COW file */ | |
1211 | uint64_t written = 0; | |
1212 | ||
1213 | while (written < n) { | |
1214 | int pnum; | |
1215 | ||
1216 | if (compare_sectors(buf_old + written * 512, | |
1217 | buf_new + written * 512, n, &pnum)) | |
1218 | { | |
1219 | ret = bdrv_write(bs, sector + written, | |
1220 | buf_old + written * 512, pnum); | |
1221 | if (ret < 0) { | |
1222 | error("Error while writing to COW image: %s", | |
1223 | strerror(-ret)); | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | written += pnum; | |
1228 | } | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * Change the backing file. All clusters that are different from the old | |
1234 | * backing file are overwritten in the COW file now, so the visible content | |
1235 | * doesn't change when we switch the backing file. | |
1236 | */ | |
1237 | ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); | |
1238 | if (ret == -ENOSPC) { | |
1239 | error("Could not change the backing file to '%s': No space left in " | |
1240 | "the file header", out_baseimg); | |
1241 | } else if (ret < 0) { | |
1242 | error("Could not change the backing file to '%s': %s", | |
1243 | out_baseimg, strerror(-ret)); | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * TODO At this point it is possible to check if any clusters that are | |
1248 | * allocated in the COW file are the same in the backing file. If so, they | |
1249 | * could be dropped from the COW file. Don't do this before switching the | |
1250 | * backing file, in case of a crash this would lead to corruption. | |
1251 | */ | |
1252 | ||
1253 | /* Cleanup */ | |
1254 | if (!unsafe) { | |
1255 | bdrv_delete(bs_old_backing); | |
1256 | bdrv_delete(bs_new_backing); | |
1257 | } | |
1258 | ||
1259 | bdrv_delete(bs); | |
1260 | ||
1261 | return 0; | |
1262 | } | |
1263 | ||
c227f099 | 1264 | static const img_cmd_t img_cmds[] = { |
153859be SB |
1265 | #define DEF(option, callback, arg_string) \ |
1266 | { option, callback }, | |
1267 | #include "qemu-img-cmds.h" | |
1268 | #undef DEF | |
1269 | #undef GEN_DOCS | |
1270 | { NULL, NULL, }, | |
1271 | }; | |
1272 | ||
ea2384d3 FB |
1273 | int main(int argc, char **argv) |
1274 | { | |
c227f099 | 1275 | const img_cmd_t *cmd; |
153859be | 1276 | const char *cmdname; |
ea2384d3 FB |
1277 | |
1278 | bdrv_init(); | |
1279 | if (argc < 2) | |
1280 | help(); | |
153859be | 1281 | cmdname = argv[1]; |
8f9b157e | 1282 | argc--; argv++; |
153859be SB |
1283 | |
1284 | /* find the command */ | |
1285 | for(cmd = img_cmds; cmd->name != NULL; cmd++) { | |
1286 | if (!strcmp(cmdname, cmd->name)) { | |
1287 | return cmd->handler(argc, argv); | |
1288 | } | |
ea2384d3 | 1289 | } |
153859be SB |
1290 | |
1291 | /* not found */ | |
1292 | help(); | |
ea2384d3 FB |
1293 | return 0; |
1294 | } |