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Commit | Line | Data |
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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 | 39 | /* Default to cache=writeback as data integrity is not important for qemu-tcg. */ |
adfe078e | 40 | #define BDRV_O_FLAGS BDRV_O_CACHE_WB |
137519ce | 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 | 191 | static BlockDriverState *bdrv_new_open(const char *filename, |
9bc378c1 | 192 | const char *fmt, |
f163d073 | 193 | int flags) |
75c23805 FB |
194 | { |
195 | BlockDriverState *bs; | |
196 | BlockDriver *drv; | |
197 | char password[256]; | |
198 | ||
199 | bs = bdrv_new(""); | |
200 | if (!bs) | |
201 | error("Not enough memory"); | |
202 | if (fmt) { | |
203 | drv = bdrv_find_format(fmt); | |
204 | if (!drv) | |
205 | error("Unknown file format '%s'", fmt); | |
206 | } else { | |
207 | drv = NULL; | |
208 | } | |
d6e9098e | 209 | if (bdrv_open(bs, filename, flags, drv) < 0) { |
75c23805 FB |
210 | error("Could not open '%s'", filename); |
211 | } | |
212 | if (bdrv_is_encrypted(bs)) { | |
213 | printf("Disk image '%s' is encrypted.\n", filename); | |
214 | if (read_password(password, sizeof(password)) < 0) | |
215 | error("No password given"); | |
216 | if (bdrv_set_key(bs, password) < 0) | |
217 | error("invalid password"); | |
218 | } | |
219 | return bs; | |
220 | } | |
221 | ||
efa84d43 KW |
222 | static void add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
223 | int flags, const char *base_filename, const char *base_fmt) | |
224 | { | |
225 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
226 | if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) { | |
227 | error("Encryption not supported for file format '%s'", fmt); | |
228 | } | |
229 | } | |
230 | if (flags & BLOCK_FLAG_COMPAT6) { | |
231 | if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) { | |
232 | error("VMDK version 6 not supported for file format '%s'", fmt); | |
233 | } | |
234 | } | |
235 | ||
236 | if (base_filename) { | |
237 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) { | |
238 | error("Backing file not supported for file format '%s'", fmt); | |
239 | } | |
240 | } | |
241 | if (base_fmt) { | |
242 | if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
243 | error("Backing file format not supported for file format '%s'", fmt); | |
244 | } | |
245 | } | |
246 | } | |
247 | ||
ea2384d3 FB |
248 | static int img_create(int argc, char **argv) |
249 | { | |
ec36ba14 | 250 | int c, ret, flags; |
ea2384d3 | 251 | const char *fmt = "raw"; |
9230eaf6 | 252 | const char *base_fmt = NULL; |
ea2384d3 FB |
253 | const char *filename; |
254 | const char *base_filename = NULL; | |
ea2384d3 | 255 | BlockDriver *drv; |
9ea2ea71 KW |
256 | QEMUOptionParameter *param = NULL; |
257 | char *options = NULL; | |
3b46e624 | 258 | |
ec36ba14 | 259 | flags = 0; |
ea2384d3 | 260 | for(;;) { |
9ea2ea71 | 261 | c = getopt(argc, argv, "F:b:f:he6o:"); |
ea2384d3 FB |
262 | if (c == -1) |
263 | break; | |
264 | switch(c) { | |
265 | case 'h': | |
266 | help(); | |
267 | break; | |
9230eaf6 AL |
268 | case 'F': |
269 | base_fmt = optarg; | |
270 | break; | |
ea2384d3 FB |
271 | case 'b': |
272 | base_filename = optarg; | |
273 | break; | |
274 | case 'f': | |
275 | fmt = optarg; | |
276 | break; | |
277 | case 'e': | |
ec36ba14 | 278 | flags |= BLOCK_FLAG_ENCRYPT; |
ea2384d3 | 279 | break; |
d8871c5a | 280 | case '6': |
ec36ba14 | 281 | flags |= BLOCK_FLAG_COMPAT6; |
d8871c5a | 282 | break; |
9ea2ea71 KW |
283 | case 'o': |
284 | options = optarg; | |
285 | break; | |
ea2384d3 FB |
286 | } |
287 | } | |
9230eaf6 | 288 | |
9ea2ea71 KW |
289 | /* Find driver and parse its options */ |
290 | drv = bdrv_find_format(fmt); | |
291 | if (!drv) | |
292 | error("Unknown file format '%s'", fmt); | |
9230eaf6 | 293 | |
db08adf5 KW |
294 | if (options && !strcmp(options, "?")) { |
295 | print_option_help(drv->create_options); | |
296 | return 0; | |
297 | } | |
298 | ||
9f56640c KW |
299 | /* Create parameter list with default values */ |
300 | param = parse_option_parameters("", drv->create_options, param); | |
301 | set_option_parameter_int(param, BLOCK_OPT_SIZE, -1); | |
302 | ||
303 | /* Parse -o options */ | |
9ea2ea71 KW |
304 | if (options) { |
305 | param = parse_option_parameters(options, drv->create_options, param); | |
306 | if (param == NULL) { | |
307 | error("Invalid options for file format '%s'.", fmt); | |
308 | } | |
9ea2ea71 KW |
309 | } |
310 | ||
db08adf5 KW |
311 | /* Get the filename */ |
312 | if (optind >= argc) | |
313 | help(); | |
314 | filename = argv[optind++]; | |
315 | ||
9ea2ea71 KW |
316 | /* Add size to parameters */ |
317 | if (optind < argc) { | |
318 | set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]); | |
319 | } | |
320 | ||
321 | /* Add old-style options to parameters */ | |
efa84d43 | 322 | add_old_style_options(fmt, param, flags, base_filename, base_fmt); |
9ea2ea71 KW |
323 | |
324 | // The size for the image must always be specified, with one exception: | |
325 | // If we are using a backing file, we can obtain the size from there | |
9f56640c | 326 | if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { |
9ea2ea71 KW |
327 | |
328 | QEMUOptionParameter *backing_file = | |
329 | get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
330 | QEMUOptionParameter *backing_fmt = | |
331 | get_option_parameter(param, BLOCK_OPT_BACKING_FMT); | |
332 | ||
333 | if (backing_file && backing_file->value.s) { | |
334 | BlockDriverState *bs; | |
335 | uint64_t size; | |
336 | const char *fmt = NULL; | |
337 | char buf[32]; | |
338 | ||
339 | if (backing_fmt && backing_fmt->value.s) { | |
340 | if (bdrv_find_format(backing_fmt->value.s)) { | |
341 | fmt = backing_fmt->value.s; | |
342 | } else { | |
343 | error("Unknown backing file format '%s'", | |
344 | backing_fmt->value.s); | |
345 | } | |
346 | } | |
347 | ||
adfe078e | 348 | bs = bdrv_new_open(backing_file->value.s, fmt, BDRV_O_FLAGS); |
9ea2ea71 KW |
349 | bdrv_get_geometry(bs, &size); |
350 | size *= 512; | |
351 | bdrv_delete(bs); | |
352 | ||
353 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
354 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
355 | } else { | |
356 | error("Image creation needs a size parameter"); | |
357 | } | |
75c23805 | 358 | } |
9ea2ea71 KW |
359 | |
360 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
361 | print_option_parameters(param); | |
362 | puts(""); | |
363 | ||
364 | ret = bdrv_create(drv, filename, param); | |
365 | free_option_parameters(param); | |
366 | ||
ea2384d3 FB |
367 | if (ret < 0) { |
368 | if (ret == -ENOTSUP) { | |
3c56521b | 369 | error("Formatting or formatting option not supported for file format '%s'", fmt); |
6e9ea0c0 AJ |
370 | } else if (ret == -EFBIG) { |
371 | error("The image size is too large for file format '%s'", fmt); | |
ea2384d3 | 372 | } else { |
3e7896de | 373 | error("%s: error while creating %s: %s", filename, fmt, strerror(-ret)); |
ea2384d3 FB |
374 | } |
375 | } | |
376 | return 0; | |
377 | } | |
378 | ||
1585969c AL |
379 | static int img_check(int argc, char **argv) |
380 | { | |
381 | int c, ret; | |
382 | const char *filename, *fmt; | |
1585969c AL |
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 | ||
adfe078e | 403 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); |
1585969c AL |
404 | ret = bdrv_check(bs); |
405 | switch(ret) { | |
406 | case 0: | |
407 | printf("No errors were found on the image.\n"); | |
408 | break; | |
409 | case -ENOTSUP: | |
410 | error("This image format does not support checks"); | |
411 | break; | |
412 | default: | |
413 | if (ret < 0) { | |
414 | error("An error occurred during the check"); | |
415 | } else { | |
416 | printf("%d errors were found on the image.\n", ret); | |
417 | } | |
418 | break; | |
419 | } | |
420 | ||
421 | bdrv_delete(bs); | |
422 | return 0; | |
423 | } | |
424 | ||
ea2384d3 FB |
425 | static int img_commit(int argc, char **argv) |
426 | { | |
427 | int c, ret; | |
428 | const char *filename, *fmt; | |
ea2384d3 FB |
429 | BlockDriverState *bs; |
430 | ||
431 | fmt = NULL; | |
432 | for(;;) { | |
433 | c = getopt(argc, argv, "f:h"); | |
434 | if (c == -1) | |
435 | break; | |
436 | switch(c) { | |
437 | case 'h': | |
438 | help(); | |
439 | break; | |
440 | case 'f': | |
441 | fmt = optarg; | |
442 | break; | |
443 | } | |
444 | } | |
5fafdf24 | 445 | if (optind >= argc) |
ea2384d3 FB |
446 | help(); |
447 | filename = argv[optind++]; | |
448 | ||
adfe078e | 449 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
ea2384d3 FB |
450 | ret = bdrv_commit(bs); |
451 | switch(ret) { | |
452 | case 0: | |
453 | printf("Image committed.\n"); | |
454 | break; | |
455 | case -ENOENT: | |
456 | error("No disk inserted"); | |
457 | break; | |
458 | case -EACCES: | |
459 | error("Image is read-only"); | |
460 | break; | |
461 | case -ENOTSUP: | |
462 | error("Image is already committed"); | |
463 | break; | |
464 | default: | |
465 | error("Error while committing image"); | |
466 | break; | |
467 | } | |
468 | ||
469 | bdrv_delete(bs); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | static int is_not_zero(const uint8_t *sector, int len) | |
474 | { | |
475 | int i; | |
476 | len >>= 2; | |
477 | for(i = 0;i < len; i++) { | |
478 | if (((uint32_t *)sector)[i] != 0) | |
479 | return 1; | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
f58c7b35 TS |
484 | /* |
485 | * Returns true iff the first sector pointed to by 'buf' contains at least | |
486 | * a non-NUL byte. | |
487 | * | |
488 | * 'pnum' is set to the number of sectors (including and immediately following | |
489 | * the first one) that are known to be in the same allocated/unallocated state. | |
490 | */ | |
ea2384d3 FB |
491 | static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) |
492 | { | |
493 | int v, i; | |
494 | ||
495 | if (n <= 0) { | |
496 | *pnum = 0; | |
497 | return 0; | |
498 | } | |
499 | v = is_not_zero(buf, 512); | |
500 | for(i = 1; i < n; i++) { | |
501 | buf += 512; | |
502 | if (v != is_not_zero(buf, 512)) | |
503 | break; | |
504 | } | |
505 | *pnum = i; | |
506 | return v; | |
507 | } | |
508 | ||
3e85c6fd KW |
509 | /* |
510 | * Compares two buffers sector by sector. Returns 0 if the first sector of both | |
511 | * buffers matches, non-zero otherwise. | |
512 | * | |
513 | * pnum is set to the number of sectors (including and immediately following | |
514 | * the first one) that are known to have the same comparison result | |
515 | */ | |
516 | static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, | |
517 | int *pnum) | |
518 | { | |
519 | int res, i; | |
520 | ||
521 | if (n <= 0) { | |
522 | *pnum = 0; | |
523 | return 0; | |
524 | } | |
525 | ||
526 | res = !!memcmp(buf1, buf2, 512); | |
527 | for(i = 1; i < n; i++) { | |
528 | buf1 += 512; | |
529 | buf2 += 512; | |
530 | ||
531 | if (!!memcmp(buf1, buf2, 512) != res) { | |
532 | break; | |
533 | } | |
534 | } | |
535 | ||
536 | *pnum = i; | |
537 | return res; | |
538 | } | |
539 | ||
80ee15a6 | 540 | #define IO_BUF_SIZE (2 * 1024 * 1024) |
ea2384d3 FB |
541 | |
542 | static int img_convert(int argc, char **argv) | |
543 | { | |
926c2d23 | 544 | int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors; |
f58c7b35 | 545 | const char *fmt, *out_fmt, *out_baseimg, *out_filename; |
ea2384d3 | 546 | BlockDriver *drv; |
926c2d23 | 547 | BlockDriverState **bs, *out_bs; |
96b8f136 TS |
548 | int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
549 | uint64_t bs_sectors; | |
d6771bfa | 550 | uint8_t * buf; |
ea2384d3 | 551 | const uint8_t *buf1; |
faea38e7 | 552 | BlockDriverInfo bdi; |
efa84d43 KW |
553 | QEMUOptionParameter *param = NULL; |
554 | char *options = NULL; | |
ea2384d3 FB |
555 | |
556 | fmt = NULL; | |
557 | out_fmt = "raw"; | |
f58c7b35 | 558 | out_baseimg = NULL; |
ec36ba14 | 559 | flags = 0; |
ea2384d3 | 560 | for(;;) { |
efa84d43 | 561 | c = getopt(argc, argv, "f:O:B:hce6o:"); |
ea2384d3 FB |
562 | if (c == -1) |
563 | break; | |
564 | switch(c) { | |
565 | case 'h': | |
566 | help(); | |
567 | break; | |
568 | case 'f': | |
569 | fmt = optarg; | |
570 | break; | |
571 | case 'O': | |
572 | out_fmt = optarg; | |
573 | break; | |
f58c7b35 TS |
574 | case 'B': |
575 | out_baseimg = optarg; | |
576 | break; | |
ea2384d3 | 577 | case 'c': |
ec36ba14 | 578 | flags |= BLOCK_FLAG_COMPRESS; |
ea2384d3 FB |
579 | break; |
580 | case 'e': | |
ec36ba14 TS |
581 | flags |= BLOCK_FLAG_ENCRYPT; |
582 | break; | |
583 | case '6': | |
584 | flags |= BLOCK_FLAG_COMPAT6; | |
ea2384d3 | 585 | break; |
efa84d43 KW |
586 | case 'o': |
587 | options = optarg; | |
588 | break; | |
ea2384d3 FB |
589 | } |
590 | } | |
3b46e624 | 591 | |
926c2d23 AZ |
592 | bs_n = argc - optind - 1; |
593 | if (bs_n < 1) help(); | |
594 | ||
595 | out_filename = argv[argc - 1]; | |
f58c7b35 TS |
596 | |
597 | if (bs_n > 1 && out_baseimg) | |
598 | error("-B makes no sense when concatenating multiple input images"); | |
926c2d23 AZ |
599 | |
600 | bs = calloc(bs_n, sizeof(BlockDriverState *)); | |
601 | if (!bs) | |
602 | error("Out of memory"); | |
603 | ||
604 | total_sectors = 0; | |
605 | for (bs_i = 0; bs_i < bs_n; bs_i++) { | |
adfe078e | 606 | bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS); |
926c2d23 AZ |
607 | if (!bs[bs_i]) |
608 | error("Could not open '%s'", argv[optind + bs_i]); | |
609 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
610 | total_sectors += bs_sectors; | |
611 | } | |
ea2384d3 | 612 | |
efa84d43 | 613 | /* Find driver and parse its options */ |
ea2384d3 FB |
614 | drv = bdrv_find_format(out_fmt); |
615 | if (!drv) | |
d34dda5e | 616 | error("Unknown file format '%s'", out_fmt); |
efa84d43 | 617 | |
db08adf5 KW |
618 | if (options && !strcmp(options, "?")) { |
619 | print_option_help(drv->create_options); | |
7078dead | 620 | free(bs); |
db08adf5 KW |
621 | return 0; |
622 | } | |
623 | ||
efa84d43 KW |
624 | if (options) { |
625 | param = parse_option_parameters(options, drv->create_options, param); | |
626 | if (param == NULL) { | |
627 | error("Invalid options for file format '%s'.", out_fmt); | |
628 | } | |
629 | } else { | |
630 | param = parse_option_parameters("", drv->create_options, param); | |
631 | } | |
632 | ||
633 | set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512); | |
634 | add_old_style_options(out_fmt, param, flags, out_baseimg, NULL); | |
635 | ||
636 | /* Check if compression is supported */ | |
637 | if (flags & BLOCK_FLAG_COMPRESS) { | |
638 | QEMUOptionParameter *encryption = | |
639 | get_option_parameter(param, BLOCK_OPT_ENCRYPT); | |
640 | ||
641 | if (!drv->bdrv_write_compressed) { | |
642 | error("Compression not supported for this file format"); | |
643 | } | |
644 | ||
645 | if (encryption && encryption->value.n) { | |
646 | error("Compression and encryption not supported at the same time"); | |
647 | } | |
648 | } | |
649 | ||
650 | /* Create the new image */ | |
651 | ret = bdrv_create(drv, out_filename, param); | |
652 | free_option_parameters(param); | |
653 | ||
ea2384d3 FB |
654 | if (ret < 0) { |
655 | if (ret == -ENOTSUP) { | |
93c65b47 | 656 | error("Formatting not supported for file format '%s'", out_fmt); |
6e9ea0c0 AJ |
657 | } else if (ret == -EFBIG) { |
658 | error("The image size is too large for file format '%s'", out_fmt); | |
ea2384d3 | 659 | } else { |
3e7896de | 660 | error("%s: error while converting %s: %s", out_filename, out_fmt, strerror(-ret)); |
ea2384d3 FB |
661 | } |
662 | } | |
3b46e624 | 663 | |
adfe078e | 664 | out_bs = bdrv_new_open(out_filename, out_fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
ea2384d3 | 665 | |
926c2d23 AZ |
666 | bs_i = 0; |
667 | bs_offset = 0; | |
668 | bdrv_get_geometry(bs[0], &bs_sectors); | |
d6771bfa | 669 | buf = qemu_malloc(IO_BUF_SIZE); |
926c2d23 AZ |
670 | |
671 | if (flags & BLOCK_FLAG_COMPRESS) { | |
faea38e7 FB |
672 | if (bdrv_get_info(out_bs, &bdi) < 0) |
673 | error("could not get block driver info"); | |
674 | cluster_size = bdi.cluster_size; | |
ea2384d3 FB |
675 | if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) |
676 | error("invalid cluster size"); | |
677 | cluster_sectors = cluster_size >> 9; | |
678 | sector_num = 0; | |
679 | for(;;) { | |
926c2d23 AZ |
680 | int64_t bs_num; |
681 | int remainder; | |
682 | uint8_t *buf2; | |
683 | ||
ea2384d3 FB |
684 | nb_sectors = total_sectors - sector_num; |
685 | if (nb_sectors <= 0) | |
686 | break; | |
687 | if (nb_sectors >= cluster_sectors) | |
688 | n = cluster_sectors; | |
689 | else | |
690 | n = nb_sectors; | |
926c2d23 AZ |
691 | |
692 | bs_num = sector_num - bs_offset; | |
693 | assert (bs_num >= 0); | |
694 | remainder = n; | |
695 | buf2 = buf; | |
696 | while (remainder > 0) { | |
697 | int nlow; | |
698 | while (bs_num == bs_sectors) { | |
699 | bs_i++; | |
700 | assert (bs_i < bs_n); | |
701 | bs_offset += bs_sectors; | |
702 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
703 | bs_num = 0; | |
704 | /* printf("changing part: sector_num=%lld, " | |
705 | "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n", | |
706 | sector_num, bs_i, bs_offset, bs_sectors); */ | |
707 | } | |
708 | assert (bs_num < bs_sectors); | |
709 | ||
710 | nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; | |
711 | ||
712 | if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0) | |
713 | error("error while reading"); | |
714 | ||
715 | buf2 += nlow * 512; | |
716 | bs_num += nlow; | |
717 | ||
718 | remainder -= nlow; | |
719 | } | |
720 | assert (remainder == 0); | |
721 | ||
ea2384d3 FB |
722 | if (n < cluster_sectors) |
723 | memset(buf + n * 512, 0, cluster_size - n * 512); | |
724 | if (is_not_zero(buf, cluster_size)) { | |
5fafdf24 | 725 | if (bdrv_write_compressed(out_bs, sector_num, buf, |
faea38e7 | 726 | cluster_sectors) != 0) |
ec3757de FB |
727 | error("error while compressing sector %" PRId64, |
728 | sector_num); | |
ea2384d3 FB |
729 | } |
730 | sector_num += n; | |
731 | } | |
faea38e7 FB |
732 | /* signal EOF to align */ |
733 | bdrv_write_compressed(out_bs, 0, NULL, 0); | |
ea2384d3 | 734 | } else { |
f58c7b35 | 735 | sector_num = 0; // total number of sectors converted so far |
ea2384d3 FB |
736 | for(;;) { |
737 | nb_sectors = total_sectors - sector_num; | |
738 | if (nb_sectors <= 0) | |
739 | break; | |
740 | if (nb_sectors >= (IO_BUF_SIZE / 512)) | |
741 | n = (IO_BUF_SIZE / 512); | |
742 | else | |
743 | n = nb_sectors; | |
926c2d23 AZ |
744 | |
745 | while (sector_num - bs_offset >= bs_sectors) { | |
746 | bs_i ++; | |
747 | assert (bs_i < bs_n); | |
748 | bs_offset += bs_sectors; | |
749 | bdrv_get_geometry(bs[bs_i], &bs_sectors); | |
750 | /* printf("changing part: sector_num=%lld, bs_i=%d, " | |
751 | "bs_offset=%lld, bs_sectors=%lld\n", | |
752 | sector_num, bs_i, bs_offset, bs_sectors); */ | |
753 | } | |
754 | ||
755 | if (n > bs_offset + bs_sectors - sector_num) | |
756 | n = bs_offset + bs_sectors - sector_num; | |
757 | ||
12c09b8c | 758 | if (!drv->no_zero_init) { |
d032044f AS |
759 | /* If the output image is being created as a copy on write image, |
760 | assume that sectors which are unallocated in the input image | |
761 | are present in both the output's and input's base images (no | |
762 | need to copy them). */ | |
763 | if (out_baseimg) { | |
764 | if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, | |
765 | n, &n1)) { | |
766 | sector_num += n1; | |
767 | continue; | |
768 | } | |
769 | /* The next 'n1' sectors are allocated in the input image. Copy | |
770 | only those as they may be followed by unallocated sectors. */ | |
771 | n = n1; | |
93c65b47 | 772 | } |
93c65b47 AL |
773 | } else { |
774 | n1 = n; | |
f58c7b35 TS |
775 | } |
776 | ||
926c2d23 | 777 | if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) |
ea2384d3 FB |
778 | error("error while reading"); |
779 | /* NOTE: at the same time we convert, we do not write zero | |
780 | sectors to have a chance to compress the image. Ideally, we | |
781 | should add a specific call to have the info to go faster */ | |
782 | buf1 = buf; | |
783 | while (n > 0) { | |
f58c7b35 TS |
784 | /* If the output image is being created as a copy on write image, |
785 | copy all sectors even the ones containing only NUL bytes, | |
93c65b47 AL |
786 | because they may differ from the sectors in the base image. |
787 | ||
788 | If the output is to a host device, we also write out | |
789 | sectors that are entirely 0, since whatever data was | |
790 | already there is garbage, not 0s. */ | |
12c09b8c | 791 | if (drv->no_zero_init || out_baseimg || |
93c65b47 | 792 | is_allocated_sectors(buf1, n, &n1)) { |
5fafdf24 | 793 | if (bdrv_write(out_bs, sector_num, buf1, n1) < 0) |
ea2384d3 FB |
794 | error("error while writing"); |
795 | } | |
796 | sector_num += n1; | |
797 | n -= n1; | |
798 | buf1 += n1 * 512; | |
799 | } | |
800 | } | |
801 | } | |
d6771bfa | 802 | qemu_free(buf); |
ea2384d3 | 803 | bdrv_delete(out_bs); |
926c2d23 AZ |
804 | for (bs_i = 0; bs_i < bs_n; bs_i++) |
805 | bdrv_delete(bs[bs_i]); | |
806 | free(bs); | |
ea2384d3 FB |
807 | return 0; |
808 | } | |
809 | ||
57d1a2b6 FB |
810 | #ifdef _WIN32 |
811 | static int64_t get_allocated_file_size(const char *filename) | |
812 | { | |
e8445331 FB |
813 | typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
814 | get_compressed_t get_compressed; | |
57d1a2b6 | 815 | struct _stati64 st; |
e8445331 FB |
816 | |
817 | /* WinNT support GetCompressedFileSize to determine allocate size */ | |
818 | get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); | |
819 | if (get_compressed) { | |
820 | DWORD high, low; | |
821 | low = get_compressed(filename, &high); | |
822 | if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) | |
823 | return (((int64_t) high) << 32) + low; | |
824 | } | |
825 | ||
5fafdf24 | 826 | if (_stati64(filename, &st) < 0) |
57d1a2b6 FB |
827 | return -1; |
828 | return st.st_size; | |
829 | } | |
830 | #else | |
831 | static int64_t get_allocated_file_size(const char *filename) | |
832 | { | |
833 | struct stat st; | |
5fafdf24 | 834 | if (stat(filename, &st) < 0) |
57d1a2b6 FB |
835 | return -1; |
836 | return (int64_t)st.st_blocks * 512; | |
837 | } | |
838 | #endif | |
839 | ||
faea38e7 FB |
840 | static void dump_snapshots(BlockDriverState *bs) |
841 | { | |
842 | QEMUSnapshotInfo *sn_tab, *sn; | |
843 | int nb_sns, i; | |
844 | char buf[256]; | |
845 | ||
846 | nb_sns = bdrv_snapshot_list(bs, &sn_tab); | |
847 | if (nb_sns <= 0) | |
848 | return; | |
849 | printf("Snapshot list:\n"); | |
850 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); | |
851 | for(i = 0; i < nb_sns; i++) { | |
852 | sn = &sn_tab[i]; | |
853 | printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); | |
854 | } | |
855 | qemu_free(sn_tab); | |
856 | } | |
857 | ||
ea2384d3 FB |
858 | static int img_info(int argc, char **argv) |
859 | { | |
860 | int c; | |
861 | const char *filename, *fmt; | |
ea2384d3 FB |
862 | BlockDriverState *bs; |
863 | char fmt_name[128], size_buf[128], dsize_buf[128]; | |
96b8f136 TS |
864 | uint64_t total_sectors; |
865 | int64_t allocated_size; | |
93b6b2a3 FB |
866 | char backing_filename[1024]; |
867 | char backing_filename2[1024]; | |
faea38e7 | 868 | BlockDriverInfo bdi; |
ea2384d3 FB |
869 | |
870 | fmt = NULL; | |
871 | for(;;) { | |
872 | c = getopt(argc, argv, "f:h"); | |
873 | if (c == -1) | |
874 | break; | |
875 | switch(c) { | |
876 | case 'h': | |
877 | help(); | |
878 | break; | |
879 | case 'f': | |
880 | fmt = optarg; | |
881 | break; | |
882 | } | |
883 | } | |
5fafdf24 | 884 | if (optind >= argc) |
ea2384d3 FB |
885 | help(); |
886 | filename = argv[optind++]; | |
887 | ||
adfe078e | 888 | bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); |
ea2384d3 FB |
889 | bdrv_get_format(bs, fmt_name, sizeof(fmt_name)); |
890 | bdrv_get_geometry(bs, &total_sectors); | |
891 | get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); | |
57d1a2b6 FB |
892 | allocated_size = get_allocated_file_size(filename); |
893 | if (allocated_size < 0) | |
a10ea30b | 894 | snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
de167e41 | 895 | else |
5fafdf24 | 896 | get_human_readable_size(dsize_buf, sizeof(dsize_buf), |
de167e41 | 897 | allocated_size); |
ea2384d3 FB |
898 | printf("image: %s\n" |
899 | "file format: %s\n" | |
ec3757de | 900 | "virtual size: %s (%" PRId64 " bytes)\n" |
ea2384d3 | 901 | "disk size: %s\n", |
5fafdf24 | 902 | filename, fmt_name, size_buf, |
ec3757de | 903 | (total_sectors * 512), |
ea2384d3 FB |
904 | dsize_buf); |
905 | if (bdrv_is_encrypted(bs)) | |
906 | printf("encrypted: yes\n"); | |
faea38e7 | 907 | if (bdrv_get_info(bs, &bdi) >= 0) { |
5fafdf24 | 908 | if (bdi.cluster_size != 0) |
faea38e7 FB |
909 | printf("cluster_size: %d\n", bdi.cluster_size); |
910 | } | |
93b6b2a3 | 911 | bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename)); |
faea38e7 | 912 | if (backing_filename[0] != '\0') { |
93b6b2a3 FB |
913 | path_combine(backing_filename2, sizeof(backing_filename2), |
914 | filename, backing_filename); | |
5fafdf24 | 915 | printf("backing file: %s (actual path: %s)\n", |
93b6b2a3 FB |
916 | backing_filename, |
917 | backing_filename2); | |
faea38e7 FB |
918 | } |
919 | dump_snapshots(bs); | |
ea2384d3 FB |
920 | bdrv_delete(bs); |
921 | return 0; | |
922 | } | |
923 | ||
f7b4a940 AL |
924 | #define SNAPSHOT_LIST 1 |
925 | #define SNAPSHOT_CREATE 2 | |
926 | #define SNAPSHOT_APPLY 3 | |
927 | #define SNAPSHOT_DELETE 4 | |
928 | ||
153859be | 929 | static int img_snapshot(int argc, char **argv) |
f7b4a940 AL |
930 | { |
931 | BlockDriverState *bs; | |
932 | QEMUSnapshotInfo sn; | |
933 | char *filename, *snapshot_name = NULL; | |
f5edb014 | 934 | int c, ret, bdrv_oflags; |
f7b4a940 AL |
935 | int action = 0; |
936 | qemu_timeval tv; | |
937 | ||
f5edb014 | 938 | bdrv_oflags = BDRV_O_RDWR; |
f7b4a940 AL |
939 | /* Parse commandline parameters */ |
940 | for(;;) { | |
941 | c = getopt(argc, argv, "la:c:d:h"); | |
942 | if (c == -1) | |
943 | break; | |
944 | switch(c) { | |
945 | case 'h': | |
946 | help(); | |
153859be | 947 | return 0; |
f7b4a940 AL |
948 | case 'l': |
949 | if (action) { | |
950 | help(); | |
153859be | 951 | return 0; |
f7b4a940 AL |
952 | } |
953 | action = SNAPSHOT_LIST; | |
f5edb014 | 954 | bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */ |
f7b4a940 AL |
955 | break; |
956 | case 'a': | |
957 | if (action) { | |
958 | help(); | |
153859be | 959 | return 0; |
f7b4a940 AL |
960 | } |
961 | action = SNAPSHOT_APPLY; | |
962 | snapshot_name = optarg; | |
963 | break; | |
964 | case 'c': | |
965 | if (action) { | |
966 | help(); | |
153859be | 967 | return 0; |
f7b4a940 AL |
968 | } |
969 | action = SNAPSHOT_CREATE; | |
970 | snapshot_name = optarg; | |
971 | break; | |
972 | case 'd': | |
973 | if (action) { | |
974 | help(); | |
153859be | 975 | return 0; |
f7b4a940 AL |
976 | } |
977 | action = SNAPSHOT_DELETE; | |
978 | snapshot_name = optarg; | |
979 | break; | |
980 | } | |
981 | } | |
982 | ||
983 | if (optind >= argc) | |
984 | help(); | |
985 | filename = argv[optind++]; | |
986 | ||
987 | /* Open the image */ | |
f163d073 | 988 | bs = bdrv_new_open(filename, NULL, bdrv_oflags); |
f7b4a940 AL |
989 | |
990 | /* Perform the requested action */ | |
991 | switch(action) { | |
992 | case SNAPSHOT_LIST: | |
993 | dump_snapshots(bs); | |
994 | break; | |
995 | ||
996 | case SNAPSHOT_CREATE: | |
997 | memset(&sn, 0, sizeof(sn)); | |
998 | pstrcpy(sn.name, sizeof(sn.name), snapshot_name); | |
999 | ||
1000 | qemu_gettimeofday(&tv); | |
1001 | sn.date_sec = tv.tv_sec; | |
1002 | sn.date_nsec = tv.tv_usec * 1000; | |
1003 | ||
1004 | ret = bdrv_snapshot_create(bs, &sn); | |
1005 | if (ret) | |
1006 | error("Could not create snapshot '%s': %d (%s)", | |
1007 | snapshot_name, ret, strerror(-ret)); | |
1008 | break; | |
1009 | ||
1010 | case SNAPSHOT_APPLY: | |
1011 | ret = bdrv_snapshot_goto(bs, snapshot_name); | |
1012 | if (ret) | |
1013 | error("Could not apply snapshot '%s': %d (%s)", | |
1014 | snapshot_name, ret, strerror(-ret)); | |
1015 | break; | |
1016 | ||
1017 | case SNAPSHOT_DELETE: | |
1018 | ret = bdrv_snapshot_delete(bs, snapshot_name); | |
1019 | if (ret) | |
1020 | error("Could not delete snapshot '%s': %d (%s)", | |
1021 | snapshot_name, ret, strerror(-ret)); | |
1022 | break; | |
1023 | } | |
1024 | ||
1025 | /* Cleanup */ | |
1026 | bdrv_delete(bs); | |
153859be SB |
1027 | |
1028 | return 0; | |
f7b4a940 AL |
1029 | } |
1030 | ||
3e85c6fd KW |
1031 | static int img_rebase(int argc, char **argv) |
1032 | { | |
1033 | BlockDriverState *bs, *bs_old_backing, *bs_new_backing; | |
f163d073 | 1034 | BlockDriver *old_backing_drv, *new_backing_drv; |
3e85c6fd | 1035 | char *filename; |
e53dbee0 | 1036 | const char *fmt, *out_basefmt, *out_baseimg; |
3e85c6fd KW |
1037 | int c, flags, ret; |
1038 | int unsafe = 0; | |
1039 | ||
1040 | /* Parse commandline parameters */ | |
e53dbee0 | 1041 | fmt = NULL; |
3e85c6fd KW |
1042 | out_baseimg = NULL; |
1043 | out_basefmt = NULL; | |
1044 | ||
1045 | for(;;) { | |
e53dbee0 | 1046 | c = getopt(argc, argv, "uhf:F:b:"); |
3e85c6fd KW |
1047 | if (c == -1) |
1048 | break; | |
1049 | switch(c) { | |
1050 | case 'h': | |
1051 | help(); | |
1052 | return 0; | |
e53dbee0 KW |
1053 | case 'f': |
1054 | fmt = optarg; | |
1055 | break; | |
3e85c6fd KW |
1056 | case 'F': |
1057 | out_basefmt = optarg; | |
1058 | break; | |
1059 | case 'b': | |
1060 | out_baseimg = optarg; | |
1061 | break; | |
1062 | case 'u': | |
1063 | unsafe = 1; | |
1064 | break; | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | if ((optind >= argc) || !out_baseimg) | |
1069 | help(); | |
1070 | filename = argv[optind++]; | |
1071 | ||
1072 | /* | |
1073 | * Open the images. | |
1074 | * | |
1075 | * Ignore the old backing file for unsafe rebase in case we want to correct | |
1076 | * the reference to a renamed or moved backing file. | |
1077 | */ | |
adfe078e | 1078 | flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0); |
f163d073 | 1079 | bs = bdrv_new_open(filename, fmt, flags); |
3e85c6fd KW |
1080 | |
1081 | /* Find the right drivers for the backing files */ | |
1082 | old_backing_drv = NULL; | |
1083 | new_backing_drv = NULL; | |
1084 | ||
1085 | if (!unsafe && bs->backing_format[0] != '\0') { | |
1086 | old_backing_drv = bdrv_find_format(bs->backing_format); | |
1087 | if (old_backing_drv == NULL) { | |
1088 | error("Invalid format name: '%s'", bs->backing_format); | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | if (out_basefmt != NULL) { | |
1093 | new_backing_drv = bdrv_find_format(out_basefmt); | |
1094 | if (new_backing_drv == NULL) { | |
1095 | error("Invalid format name: '%s'", out_basefmt); | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | /* For safe rebasing we need to compare old and new backing file */ | |
1100 | if (unsafe) { | |
1101 | /* Make the compiler happy */ | |
1102 | bs_old_backing = NULL; | |
1103 | bs_new_backing = NULL; | |
1104 | } else { | |
1105 | char backing_name[1024]; | |
1106 | ||
1107 | bs_old_backing = bdrv_new("old_backing"); | |
1108 | bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); | |
adfe078e | 1109 | if (bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS, |
3e85c6fd KW |
1110 | old_backing_drv)) |
1111 | { | |
1112 | error("Could not open old backing file '%s'", backing_name); | |
1113 | return -1; | |
1114 | } | |
1115 | ||
1116 | bs_new_backing = bdrv_new("new_backing"); | |
adfe078e | 1117 | if (bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS | BDRV_O_RDWR, |
3e85c6fd KW |
1118 | new_backing_drv)) |
1119 | { | |
584771e6 | 1120 | error("Could not open new backing file '%s'", out_baseimg); |
3e85c6fd KW |
1121 | return -1; |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Check each unallocated cluster in the COW file. If it is unallocated, | |
1127 | * accesses go to the backing file. We must therefore compare this cluster | |
1128 | * in the old and new backing file, and if they differ we need to copy it | |
1129 | * from the old backing file into the COW file. | |
1130 | * | |
1131 | * If qemu-img crashes during this step, no harm is done. The content of | |
1132 | * the image is the same as the original one at any time. | |
1133 | */ | |
1134 | if (!unsafe) { | |
1135 | uint64_t num_sectors; | |
1136 | uint64_t sector; | |
1137 | int n, n1; | |
d6771bfa T |
1138 | uint8_t * buf_old; |
1139 | uint8_t * buf_new; | |
1140 | ||
1141 | buf_old = qemu_malloc(IO_BUF_SIZE); | |
1142 | buf_new = qemu_malloc(IO_BUF_SIZE); | |
3e85c6fd KW |
1143 | |
1144 | bdrv_get_geometry(bs, &num_sectors); | |
1145 | ||
1146 | for (sector = 0; sector < num_sectors; sector += n) { | |
1147 | ||
1148 | /* How many sectors can we handle with the next read? */ | |
1149 | if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { | |
1150 | n = (IO_BUF_SIZE / 512); | |
1151 | } else { | |
1152 | n = num_sectors - sector; | |
1153 | } | |
1154 | ||
1155 | /* If the cluster is allocated, we don't need to take action */ | |
1156 | if (bdrv_is_allocated(bs, sector, n, &n1)) { | |
1157 | n = n1; | |
1158 | continue; | |
1159 | } | |
1160 | ||
1161 | /* Read old and new backing file */ | |
1162 | if (bdrv_read(bs_old_backing, sector, buf_old, n) < 0) { | |
1163 | error("error while reading from old backing file"); | |
1164 | } | |
1165 | if (bdrv_read(bs_new_backing, sector, buf_new, n) < 0) { | |
1166 | error("error while reading from new backing file"); | |
1167 | } | |
1168 | ||
1169 | /* If they differ, we need to write to the COW file */ | |
1170 | uint64_t written = 0; | |
1171 | ||
1172 | while (written < n) { | |
1173 | int pnum; | |
1174 | ||
1175 | if (compare_sectors(buf_old + written * 512, | |
60b1bd4f | 1176 | buf_new + written * 512, n - written, &pnum)) |
3e85c6fd KW |
1177 | { |
1178 | ret = bdrv_write(bs, sector + written, | |
1179 | buf_old + written * 512, pnum); | |
1180 | if (ret < 0) { | |
1181 | error("Error while writing to COW image: %s", | |
1182 | strerror(-ret)); | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | written += pnum; | |
1187 | } | |
1188 | } | |
d6771bfa T |
1189 | |
1190 | qemu_free(buf_old); | |
1191 | qemu_free(buf_new); | |
3e85c6fd KW |
1192 | } |
1193 | ||
1194 | /* | |
1195 | * Change the backing file. All clusters that are different from the old | |
1196 | * backing file are overwritten in the COW file now, so the visible content | |
1197 | * doesn't change when we switch the backing file. | |
1198 | */ | |
1199 | ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); | |
1200 | if (ret == -ENOSPC) { | |
1201 | error("Could not change the backing file to '%s': No space left in " | |
1202 | "the file header", out_baseimg); | |
1203 | } else if (ret < 0) { | |
1204 | error("Could not change the backing file to '%s': %s", | |
1205 | out_baseimg, strerror(-ret)); | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * TODO At this point it is possible to check if any clusters that are | |
1210 | * allocated in the COW file are the same in the backing file. If so, they | |
1211 | * could be dropped from the COW file. Don't do this before switching the | |
1212 | * backing file, in case of a crash this would lead to corruption. | |
1213 | */ | |
1214 | ||
1215 | /* Cleanup */ | |
1216 | if (!unsafe) { | |
1217 | bdrv_delete(bs_old_backing); | |
1218 | bdrv_delete(bs_new_backing); | |
1219 | } | |
1220 | ||
1221 | bdrv_delete(bs); | |
1222 | ||
1223 | return 0; | |
1224 | } | |
1225 | ||
c227f099 | 1226 | static const img_cmd_t img_cmds[] = { |
153859be SB |
1227 | #define DEF(option, callback, arg_string) \ |
1228 | { option, callback }, | |
1229 | #include "qemu-img-cmds.h" | |
1230 | #undef DEF | |
1231 | #undef GEN_DOCS | |
1232 | { NULL, NULL, }, | |
1233 | }; | |
1234 | ||
ea2384d3 FB |
1235 | int main(int argc, char **argv) |
1236 | { | |
c227f099 | 1237 | const img_cmd_t *cmd; |
153859be | 1238 | const char *cmdname; |
ea2384d3 FB |
1239 | |
1240 | bdrv_init(); | |
1241 | if (argc < 2) | |
1242 | help(); | |
153859be | 1243 | cmdname = argv[1]; |
8f9b157e | 1244 | argc--; argv++; |
153859be SB |
1245 | |
1246 | /* find the command */ | |
1247 | for(cmd = img_cmds; cmd->name != NULL; cmd++) { | |
1248 | if (!strcmp(cmdname, cmd->name)) { | |
1249 | return cmd->handler(argc, argv); | |
1250 | } | |
ea2384d3 | 1251 | } |
153859be SB |
1252 | |
1253 | /* not found */ | |
1254 | help(); | |
ea2384d3 FB |
1255 | return 0; |
1256 | } |