Annotation of qemu/qemu-img.c, revision 1.1.1.10
1.1 root 1: /*
1.1.1.3 root 2: * QEMU disk image utility
1.1.1.4 root 3: *
4: * Copyright (c) 2003-2008 Fabrice Bellard
5: *
1.1 root 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: */
1.1.1.4 root 24: #include "qemu-common.h"
1.1.1.8 root 25: #include "qemu-option.h"
1.1.1.5 root 26: #include "osdep.h"
1.1.1.4 root 27: #include "block_int.h"
1.1.1.8 root 28: #include <stdio.h>
1.1 root 29:
1.1.1.2 root 30: #ifdef _WIN32
31: #include <windows.h>
32: #endif
33:
1.1.1.8 root 34: typedef struct img_cmd_t {
35: const char *name;
36: int (*handler)(int argc, char **argv);
37: } img_cmd_t;
38:
1.1.1.5 root 39: /* Default to cache=writeback as data integrity is not important for qemu-tcg. */
40: #define BRDV_O_FLAGS BDRV_O_CACHE_WB
1.1 root 41:
1.1.1.5 root 42: static void QEMU_NORETURN error(const char *fmt, ...)
1.1 root 43: {
44: va_list ap;
45: va_start(ap, fmt);
46: fprintf(stderr, "qemu-img: ");
47: vfprintf(stderr, fmt, ap);
48: fprintf(stderr, "\n");
49: 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:
1.1.1.5 root 58: /* Please keep in synch with qemu-img.texi */
1.1.1.4 root 59: static void help(void)
1.1 root 60: {
1.1.1.4 root 61: printf("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
1.1 root 62: "usage: qemu-img command [command options]\n"
63: "QEMU disk image utility\n"
64: "\n"
65: "Command syntax:\n"
1.1.1.8 root 66: #define DEF(option, callback, arg_string) \
67: " " arg_string "\n"
68: #include "qemu-img-cmds.h"
69: #undef DEF
70: #undef GEN_DOCS
1.1 root 71: "\n"
72: "Command parameters:\n"
73: " 'filename' is a disk image filename\n"
74: " 'fmt' is the disk image format. It is guessed automatically in most cases\n"
1.1.1.9 root 75: " 'size' is the disk image size in bytes. Optional suffixes\n"
76: " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n"
77: " and T (terabyte, 1024G) are supported. 'b' is ignored.\n"
1.1 root 78: " 'output_filename' is the destination disk image filename\n"
79: " 'output_fmt' is the destination format\n"
1.1.1.8 root 80: " 'options' is a comma separated list of format specific options in a\n"
81: " name=value format. Use -o ? for an overview of the options supported by the\n"
82: " used format\n"
1.1 root 83: " '-c' indicates that target image must be compressed (qcow format only)\n"
1.1.1.5 root 84: " '-h' with or without a command shows this help and lists the supported formats\n"
85: "\n"
86: "Parameters to snapshot subcommand:\n"
87: " 'snapshot' is the name of the snapshot to create, apply or delete\n"
88: " '-a' applies a snapshot (revert disk to saved state)\n"
89: " '-c' creates a snapshot\n"
90: " '-d' deletes a snapshot\n"
91: " '-l' lists all snapshots in the given image\n"
1.1 root 92: );
1.1.1.5 root 93: printf("\nSupported formats:");
1.1 root 94: bdrv_iterate_format(format_print, NULL);
95: printf("\n");
96: exit(1);
97: }
98:
99: #if defined(WIN32)
100: /* XXX: put correct support for win32 */
101: static int read_password(char *buf, int buf_size)
102: {
103: int c, i;
104: printf("Password: ");
105: fflush(stdout);
106: i = 0;
107: for(;;) {
108: c = getchar();
109: if (c == '\n')
110: break;
111: if (i < (buf_size - 1))
112: buf[i++] = c;
113: }
114: buf[i] = '\0';
115: return 0;
116: }
117:
118: #else
119:
120: #include <termios.h>
121:
122: static struct termios oldtty;
123:
124: static void term_exit(void)
125: {
126: tcsetattr (0, TCSANOW, &oldtty);
127: }
128:
129: static void term_init(void)
130: {
131: struct termios tty;
132:
133: tcgetattr (0, &tty);
134: oldtty = tty;
135:
136: tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
137: |INLCR|IGNCR|ICRNL|IXON);
138: tty.c_oflag |= OPOST;
139: tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
140: tty.c_cflag &= ~(CSIZE|PARENB);
141: tty.c_cflag |= CS8;
142: tty.c_cc[VMIN] = 1;
143: tty.c_cc[VTIME] = 0;
1.1.1.4 root 144:
1.1 root 145: tcsetattr (0, TCSANOW, &tty);
146:
147: atexit(term_exit);
148: }
149:
1.1.1.4 root 150: static int read_password(char *buf, int buf_size)
1.1 root 151: {
152: uint8_t ch;
153: int i, ret;
154:
155: printf("password: ");
156: fflush(stdout);
157: term_init();
158: i = 0;
159: for(;;) {
160: ret = read(0, &ch, 1);
161: if (ret == -1) {
162: if (errno == EAGAIN || errno == EINTR) {
163: continue;
164: } else {
165: ret = -1;
166: break;
167: }
168: } else if (ret == 0) {
169: ret = -1;
170: break;
171: } else {
172: if (ch == '\r') {
173: ret = 0;
174: break;
175: }
176: if (i < (buf_size - 1))
177: buf[i++] = ch;
178: }
179: }
180: term_exit();
181: buf[i] = '\0';
182: printf("\n");
183: return ret;
184: }
185: #endif
186:
187: static BlockDriverState *bdrv_new_open(const char *filename,
188: const char *fmt)
189: {
190: BlockDriverState *bs;
191: BlockDriver *drv;
192: char password[256];
193:
194: bs = bdrv_new("");
195: if (!bs)
196: error("Not enough memory");
197: if (fmt) {
198: drv = bdrv_find_format(fmt);
199: if (!drv)
200: error("Unknown file format '%s'", fmt);
201: } else {
202: drv = NULL;
203: }
1.1.1.5 root 204: if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
1.1 root 205: error("Could not open '%s'", filename);
206: }
207: if (bdrv_is_encrypted(bs)) {
208: printf("Disk image '%s' is encrypted.\n", filename);
209: if (read_password(password, sizeof(password)) < 0)
210: error("No password given");
211: if (bdrv_set_key(bs, password) < 0)
212: error("invalid password");
213: }
214: return bs;
215: }
216:
1.1.1.8 root 217: static void add_old_style_options(const char *fmt, QEMUOptionParameter *list,
218: int flags, const char *base_filename, const char *base_fmt)
219: {
220: if (flags & BLOCK_FLAG_ENCRYPT) {
221: if (set_option_parameter(list, BLOCK_OPT_ENCRYPT, "on")) {
222: error("Encryption not supported for file format '%s'", fmt);
223: }
224: }
225: if (flags & BLOCK_FLAG_COMPAT6) {
226: if (set_option_parameter(list, BLOCK_OPT_COMPAT6, "on")) {
227: error("VMDK version 6 not supported for file format '%s'", fmt);
228: }
229: }
230:
231: if (base_filename) {
232: if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
233: error("Backing file not supported for file format '%s'", fmt);
234: }
235: }
236: if (base_fmt) {
237: if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
238: error("Backing file format not supported for file format '%s'", fmt);
239: }
240: }
241: }
242:
1.1 root 243: static int img_create(int argc, char **argv)
244: {
1.1.1.4 root 245: int c, ret, flags;
1.1 root 246: const char *fmt = "raw";
1.1.1.8 root 247: const char *base_fmt = NULL;
1.1 root 248: const char *filename;
249: const char *base_filename = NULL;
250: BlockDriver *drv;
1.1.1.8 root 251: QEMUOptionParameter *param = NULL;
252: char *options = NULL;
1.1.1.4 root 253:
254: flags = 0;
1.1 root 255: for(;;) {
1.1.1.8 root 256: c = getopt(argc, argv, "F:b:f:he6o:");
1.1 root 257: if (c == -1)
258: break;
259: switch(c) {
260: case 'h':
261: help();
262: break;
1.1.1.8 root 263: case 'F':
264: base_fmt = optarg;
265: break;
1.1 root 266: case 'b':
267: base_filename = optarg;
268: break;
269: case 'f':
270: fmt = optarg;
271: break;
272: case 'e':
1.1.1.4 root 273: flags |= BLOCK_FLAG_ENCRYPT;
274: break;
275: case '6':
276: flags |= BLOCK_FLAG_COMPAT6;
1.1 root 277: break;
1.1.1.8 root 278: case 'o':
279: options = optarg;
280: break;
1.1 root 281: }
282: }
1.1.1.8 root 283:
284: /* Find driver and parse its options */
285: drv = bdrv_find_format(fmt);
286: if (!drv)
287: error("Unknown file format '%s'", fmt);
288:
289: if (options && !strcmp(options, "?")) {
290: print_option_help(drv->create_options);
291: return 0;
292: }
293:
1.1.1.9 root 294: /* Create parameter list with default values */
295: param = parse_option_parameters("", drv->create_options, param);
296: set_option_parameter_int(param, BLOCK_OPT_SIZE, -1);
297:
298: /* Parse -o options */
1.1.1.8 root 299: if (options) {
300: param = parse_option_parameters(options, drv->create_options, param);
301: if (param == NULL) {
302: error("Invalid options for file format '%s'.", fmt);
303: }
304: }
305:
306: /* Get the filename */
1.1.1.4 root 307: if (optind >= argc)
1.1 root 308: help();
309: filename = argv[optind++];
1.1.1.8 root 310:
311: /* Add size to parameters */
312: if (optind < argc) {
313: set_option_parameter(param, BLOCK_OPT_SIZE, argv[optind++]);
314: }
315:
316: /* Add old-style options to parameters */
317: add_old_style_options(fmt, param, flags, base_filename, base_fmt);
318:
319: // The size for the image must always be specified, with one exception:
320: // If we are using a backing file, we can obtain the size from there
1.1.1.9 root 321: if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) {
1.1.1.8 root 322:
323: QEMUOptionParameter *backing_file =
324: get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
325: QEMUOptionParameter *backing_fmt =
326: get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
327:
328: if (backing_file && backing_file->value.s) {
329: BlockDriverState *bs;
330: uint64_t size;
331: const char *fmt = NULL;
332: char buf[32];
333:
334: if (backing_fmt && backing_fmt->value.s) {
335: if (bdrv_find_format(backing_fmt->value.s)) {
336: fmt = backing_fmt->value.s;
337: } else {
338: error("Unknown backing file format '%s'",
339: backing_fmt->value.s);
340: }
341: }
342:
343: bs = bdrv_new_open(backing_file->value.s, fmt);
344: bdrv_get_geometry(bs, &size);
345: size *= 512;
346: bdrv_delete(bs);
347:
348: snprintf(buf, sizeof(buf), "%" PRId64, size);
349: set_option_parameter(param, BLOCK_OPT_SIZE, buf);
1.1 root 350: } else {
1.1.1.8 root 351: error("Image creation needs a size parameter");
1.1 root 352: }
353: }
1.1.1.8 root 354:
355: printf("Formatting '%s', fmt=%s ", filename, fmt);
356: print_option_parameters(param);
357: puts("");
358:
359: ret = bdrv_create(drv, filename, param);
360: free_option_parameters(param);
361:
1.1 root 362: if (ret < 0) {
363: if (ret == -ENOTSUP) {
364: error("Formatting or formatting option not supported for file format '%s'", fmt);
1.1.1.7 root 365: } else if (ret == -EFBIG) {
366: error("The image size is too large for file format '%s'", fmt);
1.1 root 367: } else {
368: error("Error while formatting");
369: }
370: }
371: return 0;
372: }
373:
1.1.1.8 root 374: static int img_check(int argc, char **argv)
375: {
376: int c, ret;
377: const char *filename, *fmt;
378: BlockDriver *drv;
379: BlockDriverState *bs;
380:
381: fmt = NULL;
382: for(;;) {
383: c = getopt(argc, argv, "f:h");
384: if (c == -1)
385: break;
386: switch(c) {
387: case 'h':
388: help();
389: break;
390: case 'f':
391: fmt = optarg;
392: break;
393: }
394: }
395: if (optind >= argc)
396: help();
397: filename = argv[optind++];
398:
399: bs = bdrv_new("");
400: if (!bs)
401: error("Not enough memory");
402: if (fmt) {
403: drv = bdrv_find_format(fmt);
404: if (!drv)
405: error("Unknown file format '%s'", fmt);
406: } else {
407: drv = NULL;
408: }
409: if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
410: error("Could not open '%s'", filename);
411: }
412: ret = bdrv_check(bs);
413: switch(ret) {
414: case 0:
415: printf("No errors were found on the image.\n");
416: break;
417: case -ENOTSUP:
418: error("This image format does not support checks");
419: break;
420: default:
421: if (ret < 0) {
422: error("An error occurred during the check");
423: } else {
424: printf("%d errors were found on the image.\n", ret);
425: }
426: break;
427: }
428:
429: bdrv_delete(bs);
430: return 0;
431: }
432:
1.1 root 433: static int img_commit(int argc, char **argv)
434: {
435: int c, ret;
436: const char *filename, *fmt;
437: BlockDriver *drv;
438: BlockDriverState *bs;
439:
440: fmt = NULL;
441: for(;;) {
442: c = getopt(argc, argv, "f:h");
443: if (c == -1)
444: break;
445: switch(c) {
446: case 'h':
447: help();
448: break;
449: case 'f':
450: fmt = optarg;
451: break;
452: }
453: }
1.1.1.4 root 454: if (optind >= argc)
1.1 root 455: help();
456: filename = argv[optind++];
457:
458: bs = bdrv_new("");
459: if (!bs)
460: error("Not enough memory");
461: if (fmt) {
462: drv = bdrv_find_format(fmt);
463: if (!drv)
464: error("Unknown file format '%s'", fmt);
465: } else {
466: drv = NULL;
467: }
1.1.1.5 root 468: if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
1.1 root 469: error("Could not open '%s'", filename);
470: }
471: ret = bdrv_commit(bs);
472: switch(ret) {
473: case 0:
474: printf("Image committed.\n");
475: break;
476: case -ENOENT:
477: error("No disk inserted");
478: break;
479: case -EACCES:
480: error("Image is read-only");
481: break;
482: case -ENOTSUP:
483: error("Image is already committed");
484: break;
485: default:
486: error("Error while committing image");
487: break;
488: }
489:
490: bdrv_delete(bs);
491: return 0;
492: }
493:
494: static int is_not_zero(const uint8_t *sector, int len)
495: {
496: int i;
497: len >>= 2;
498: for(i = 0;i < len; i++) {
499: if (((uint32_t *)sector)[i] != 0)
500: return 1;
501: }
502: return 0;
503: }
504:
1.1.1.5 root 505: /*
506: * Returns true iff the first sector pointed to by 'buf' contains at least
507: * a non-NUL byte.
508: *
509: * 'pnum' is set to the number of sectors (including and immediately following
510: * the first one) that are known to be in the same allocated/unallocated state.
511: */
1.1 root 512: static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
513: {
514: int v, i;
515:
516: if (n <= 0) {
517: *pnum = 0;
518: return 0;
519: }
520: v = is_not_zero(buf, 512);
521: for(i = 1; i < n; i++) {
522: buf += 512;
523: if (v != is_not_zero(buf, 512))
524: break;
525: }
526: *pnum = i;
527: return v;
528: }
529:
1.1.1.9 root 530: #define IO_BUF_SIZE (2 * 1024 * 1024)
1.1 root 531:
532: static int img_convert(int argc, char **argv)
533: {
1.1.1.4 root 534: int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
1.1.1.5 root 535: const char *fmt, *out_fmt, *out_baseimg, *out_filename;
1.1 root 536: BlockDriver *drv;
1.1.1.4 root 537: BlockDriverState **bs, *out_bs;
538: int64_t total_sectors, nb_sectors, sector_num, bs_offset;
539: uint64_t bs_sectors;
1.1.1.10! root 540: uint8_t * buf;
1.1 root 541: const uint8_t *buf1;
1.1.1.3 root 542: BlockDriverInfo bdi;
1.1.1.8 root 543: QEMUOptionParameter *param = NULL;
544: char *options = NULL;
1.1 root 545:
546: fmt = NULL;
547: out_fmt = "raw";
1.1.1.5 root 548: out_baseimg = NULL;
1.1.1.4 root 549: flags = 0;
1.1 root 550: for(;;) {
1.1.1.8 root 551: c = getopt(argc, argv, "f:O:B:hce6o:");
1.1 root 552: if (c == -1)
553: break;
554: switch(c) {
555: case 'h':
556: help();
557: break;
558: case 'f':
559: fmt = optarg;
560: break;
561: case 'O':
562: out_fmt = optarg;
563: break;
1.1.1.5 root 564: case 'B':
565: out_baseimg = optarg;
566: break;
1.1 root 567: case 'c':
1.1.1.4 root 568: flags |= BLOCK_FLAG_COMPRESS;
1.1 root 569: break;
570: case 'e':
1.1.1.4 root 571: flags |= BLOCK_FLAG_ENCRYPT;
572: break;
573: case '6':
574: flags |= BLOCK_FLAG_COMPAT6;
1.1 root 575: break;
1.1.1.8 root 576: case 'o':
577: options = optarg;
578: break;
1.1 root 579: }
580: }
1.1.1.4 root 581:
582: bs_n = argc - optind - 1;
583: if (bs_n < 1) help();
584:
585: out_filename = argv[argc - 1];
1.1.1.5 root 586:
587: if (bs_n > 1 && out_baseimg)
588: error("-B makes no sense when concatenating multiple input images");
1.1.1.4 root 589:
590: bs = calloc(bs_n, sizeof(BlockDriverState *));
591: if (!bs)
592: error("Out of memory");
593:
594: total_sectors = 0;
595: for (bs_i = 0; bs_i < bs_n; bs_i++) {
596: bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);
597: if (!bs[bs_i])
598: error("Could not open '%s'", argv[optind + bs_i]);
599: bdrv_get_geometry(bs[bs_i], &bs_sectors);
600: total_sectors += bs_sectors;
601: }
1.1 root 602:
1.1.1.8 root 603: /* Find driver and parse its options */
1.1 root 604: drv = bdrv_find_format(out_fmt);
605: if (!drv)
1.1.1.4 root 606: error("Unknown file format '%s'", out_fmt);
607:
1.1.1.8 root 608: if (options && !strcmp(options, "?")) {
609: print_option_help(drv->create_options);
1.1.1.9 root 610: free(bs);
1.1.1.8 root 611: return 0;
612: }
613:
614: if (options) {
615: param = parse_option_parameters(options, drv->create_options, param);
616: if (param == NULL) {
617: error("Invalid options for file format '%s'.", out_fmt);
618: }
619: } else {
620: param = parse_option_parameters("", drv->create_options, param);
621: }
622:
623: set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
624: add_old_style_options(out_fmt, param, flags, out_baseimg, NULL);
625:
626: /* Check if compression is supported */
627: if (flags & BLOCK_FLAG_COMPRESS) {
628: QEMUOptionParameter *encryption =
629: get_option_parameter(param, BLOCK_OPT_ENCRYPT);
630:
631: if (!drv->bdrv_write_compressed) {
632: error("Compression not supported for this file format");
633: }
634:
635: if (encryption && encryption->value.n) {
636: error("Compression and encryption not supported at the same time");
637: }
638: }
639:
640: /* Create the new image */
641: ret = bdrv_create(drv, out_filename, param);
642: free_option_parameters(param);
643:
1.1 root 644: if (ret < 0) {
645: if (ret == -ENOTSUP) {
1.1.1.7 root 646: error("Formatting not supported for file format '%s'", out_fmt);
647: } else if (ret == -EFBIG) {
648: error("The image size is too large for file format '%s'", out_fmt);
1.1 root 649: } else {
650: error("Error while formatting '%s'", out_filename);
651: }
652: }
1.1.1.4 root 653:
1.1 root 654: out_bs = bdrv_new_open(out_filename, out_fmt);
655:
1.1.1.4 root 656: bs_i = 0;
657: bs_offset = 0;
658: bdrv_get_geometry(bs[0], &bs_sectors);
1.1.1.10! root 659: buf = qemu_malloc(IO_BUF_SIZE);
1.1.1.4 root 660:
661: if (flags & BLOCK_FLAG_COMPRESS) {
1.1.1.3 root 662: if (bdrv_get_info(out_bs, &bdi) < 0)
663: error("could not get block driver info");
664: cluster_size = bdi.cluster_size;
1.1 root 665: if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
666: error("invalid cluster size");
667: cluster_sectors = cluster_size >> 9;
668: sector_num = 0;
669: for(;;) {
1.1.1.4 root 670: int64_t bs_num;
671: int remainder;
672: uint8_t *buf2;
673:
1.1 root 674: nb_sectors = total_sectors - sector_num;
675: if (nb_sectors <= 0)
676: break;
677: if (nb_sectors >= cluster_sectors)
678: n = cluster_sectors;
679: else
680: n = nb_sectors;
1.1.1.4 root 681:
682: bs_num = sector_num - bs_offset;
683: assert (bs_num >= 0);
684: remainder = n;
685: buf2 = buf;
686: while (remainder > 0) {
687: int nlow;
688: while (bs_num == bs_sectors) {
689: bs_i++;
690: assert (bs_i < bs_n);
691: bs_offset += bs_sectors;
692: bdrv_get_geometry(bs[bs_i], &bs_sectors);
693: bs_num = 0;
694: /* printf("changing part: sector_num=%lld, "
695: "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
696: sector_num, bs_i, bs_offset, bs_sectors); */
697: }
698: assert (bs_num < bs_sectors);
699:
700: nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;
701:
702: if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0)
703: error("error while reading");
704:
705: buf2 += nlow * 512;
706: bs_num += nlow;
707:
708: remainder -= nlow;
709: }
710: assert (remainder == 0);
711:
1.1 root 712: if (n < cluster_sectors)
713: memset(buf + n * 512, 0, cluster_size - n * 512);
714: if (is_not_zero(buf, cluster_size)) {
1.1.1.4 root 715: if (bdrv_write_compressed(out_bs, sector_num, buf,
1.1.1.3 root 716: cluster_sectors) != 0)
1.1.1.2 root 717: error("error while compressing sector %" PRId64,
718: sector_num);
1.1 root 719: }
720: sector_num += n;
721: }
1.1.1.3 root 722: /* signal EOF to align */
723: bdrv_write_compressed(out_bs, 0, NULL, 0);
1.1 root 724: } else {
1.1.1.5 root 725: sector_num = 0; // total number of sectors converted so far
1.1 root 726: for(;;) {
727: nb_sectors = total_sectors - sector_num;
728: if (nb_sectors <= 0)
729: break;
730: if (nb_sectors >= (IO_BUF_SIZE / 512))
731: n = (IO_BUF_SIZE / 512);
732: else
733: n = nb_sectors;
1.1.1.4 root 734:
735: while (sector_num - bs_offset >= bs_sectors) {
736: bs_i ++;
737: assert (bs_i < bs_n);
738: bs_offset += bs_sectors;
739: bdrv_get_geometry(bs[bs_i], &bs_sectors);
740: /* printf("changing part: sector_num=%lld, bs_i=%d, "
741: "bs_offset=%lld, bs_sectors=%lld\n",
742: sector_num, bs_i, bs_offset, bs_sectors); */
743: }
744:
745: if (n > bs_offset + bs_sectors - sector_num)
746: n = bs_offset + bs_sectors - sector_num;
747:
1.1.1.9 root 748: if (!drv->no_zero_init) {
1.1.1.8 root 749: /* If the output image is being created as a copy on write image,
750: assume that sectors which are unallocated in the input image
751: are present in both the output's and input's base images (no
752: need to copy them). */
753: if (out_baseimg) {
754: if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
755: n, &n1)) {
756: sector_num += n1;
757: continue;
758: }
759: /* The next 'n1' sectors are allocated in the input image. Copy
760: only those as they may be followed by unallocated sectors. */
761: n = n1;
762: }
763: } else {
764: n1 = n;
1.1.1.5 root 765: }
766:
1.1.1.4 root 767: if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0)
1.1 root 768: error("error while reading");
769: /* NOTE: at the same time we convert, we do not write zero
770: sectors to have a chance to compress the image. Ideally, we
771: should add a specific call to have the info to go faster */
772: buf1 = buf;
773: while (n > 0) {
1.1.1.5 root 774: /* If the output image is being created as a copy on write image,
775: copy all sectors even the ones containing only NUL bytes,
1.1.1.8 root 776: because they may differ from the sectors in the base image.
777:
778: If the output is to a host device, we also write out
779: sectors that are entirely 0, since whatever data was
780: already there is garbage, not 0s. */
1.1.1.9 root 781: if (drv->no_zero_init || out_baseimg ||
1.1.1.8 root 782: is_allocated_sectors(buf1, n, &n1)) {
1.1.1.4 root 783: if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
1.1 root 784: error("error while writing");
785: }
786: sector_num += n1;
787: n -= n1;
788: buf1 += n1 * 512;
789: }
790: }
791: }
1.1.1.10! root 792: qemu_free(buf);
1.1 root 793: bdrv_delete(out_bs);
1.1.1.4 root 794: for (bs_i = 0; bs_i < bs_n; bs_i++)
795: bdrv_delete(bs[bs_i]);
796: free(bs);
1.1 root 797: return 0;
798: }
799:
800: #ifdef _WIN32
801: static int64_t get_allocated_file_size(const char *filename)
802: {
1.1.1.2 root 803: typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
804: get_compressed_t get_compressed;
1.1 root 805: struct _stati64 st;
1.1.1.2 root 806:
807: /* WinNT support GetCompressedFileSize to determine allocate size */
808: get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");
809: if (get_compressed) {
810: DWORD high, low;
811: low = get_compressed(filename, &high);
812: if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)
813: return (((int64_t) high) << 32) + low;
814: }
815:
1.1.1.4 root 816: if (_stati64(filename, &st) < 0)
1.1 root 817: return -1;
818: return st.st_size;
819: }
820: #else
821: static int64_t get_allocated_file_size(const char *filename)
822: {
823: struct stat st;
1.1.1.4 root 824: if (stat(filename, &st) < 0)
1.1 root 825: return -1;
826: return (int64_t)st.st_blocks * 512;
827: }
828: #endif
829:
1.1.1.3 root 830: static void dump_snapshots(BlockDriverState *bs)
831: {
832: QEMUSnapshotInfo *sn_tab, *sn;
833: int nb_sns, i;
834: char buf[256];
835:
836: nb_sns = bdrv_snapshot_list(bs, &sn_tab);
837: if (nb_sns <= 0)
838: return;
839: printf("Snapshot list:\n");
840: printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
841: for(i = 0; i < nb_sns; i++) {
842: sn = &sn_tab[i];
843: printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
844: }
845: qemu_free(sn_tab);
846: }
847:
1.1 root 848: static int img_info(int argc, char **argv)
849: {
850: int c;
851: const char *filename, *fmt;
852: BlockDriver *drv;
853: BlockDriverState *bs;
854: char fmt_name[128], size_buf[128], dsize_buf[128];
1.1.1.4 root 855: uint64_t total_sectors;
856: int64_t allocated_size;
1.1.1.3 root 857: char backing_filename[1024];
858: char backing_filename2[1024];
859: BlockDriverInfo bdi;
1.1 root 860:
861: fmt = NULL;
862: for(;;) {
863: c = getopt(argc, argv, "f:h");
864: if (c == -1)
865: break;
866: switch(c) {
867: case 'h':
868: help();
869: break;
870: case 'f':
871: fmt = optarg;
872: break;
873: }
874: }
1.1.1.4 root 875: if (optind >= argc)
1.1 root 876: help();
877: filename = argv[optind++];
878:
879: bs = bdrv_new("");
880: if (!bs)
881: error("Not enough memory");
882: if (fmt) {
883: drv = bdrv_find_format(fmt);
884: if (!drv)
885: error("Unknown file format '%s'", fmt);
886: } else {
887: drv = NULL;
888: }
1.1.1.5 root 889: if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
1.1 root 890: error("Could not open '%s'", filename);
891: }
892: bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
893: bdrv_get_geometry(bs, &total_sectors);
894: get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
895: allocated_size = get_allocated_file_size(filename);
896: if (allocated_size < 0)
1.1.1.5 root 897: snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
1.1 root 898: else
1.1.1.4 root 899: get_human_readable_size(dsize_buf, sizeof(dsize_buf),
1.1 root 900: allocated_size);
901: printf("image: %s\n"
902: "file format: %s\n"
1.1.1.2 root 903: "virtual size: %s (%" PRId64 " bytes)\n"
1.1 root 904: "disk size: %s\n",
1.1.1.4 root 905: filename, fmt_name, size_buf,
1.1.1.2 root 906: (total_sectors * 512),
1.1 root 907: dsize_buf);
908: if (bdrv_is_encrypted(bs))
909: printf("encrypted: yes\n");
1.1.1.3 root 910: if (bdrv_get_info(bs, &bdi) >= 0) {
1.1.1.4 root 911: if (bdi.cluster_size != 0)
1.1.1.3 root 912: printf("cluster_size: %d\n", bdi.cluster_size);
913: }
914: bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
915: if (backing_filename[0] != '\0') {
916: path_combine(backing_filename2, sizeof(backing_filename2),
917: filename, backing_filename);
1.1.1.4 root 918: printf("backing file: %s (actual path: %s)\n",
1.1.1.3 root 919: backing_filename,
920: backing_filename2);
921: }
922: dump_snapshots(bs);
1.1 root 923: bdrv_delete(bs);
924: return 0;
925: }
926:
1.1.1.5 root 927: #define SNAPSHOT_LIST 1
928: #define SNAPSHOT_CREATE 2
929: #define SNAPSHOT_APPLY 3
930: #define SNAPSHOT_DELETE 4
931:
1.1.1.8 root 932: static int img_snapshot(int argc, char **argv)
1.1.1.5 root 933: {
934: BlockDriverState *bs;
935: QEMUSnapshotInfo sn;
936: char *filename, *snapshot_name = NULL;
937: int c, ret;
938: int action = 0;
939: qemu_timeval tv;
940:
941: /* Parse commandline parameters */
942: for(;;) {
943: c = getopt(argc, argv, "la:c:d:h");
944: if (c == -1)
945: break;
946: switch(c) {
947: case 'h':
948: help();
1.1.1.8 root 949: return 0;
1.1.1.5 root 950: case 'l':
951: if (action) {
952: help();
1.1.1.8 root 953: return 0;
1.1.1.5 root 954: }
955: action = SNAPSHOT_LIST;
956: break;
957: case 'a':
958: if (action) {
959: help();
1.1.1.8 root 960: return 0;
1.1.1.5 root 961: }
962: action = SNAPSHOT_APPLY;
963: snapshot_name = optarg;
964: break;
965: case 'c':
966: if (action) {
967: help();
1.1.1.8 root 968: return 0;
1.1.1.5 root 969: }
970: action = SNAPSHOT_CREATE;
971: snapshot_name = optarg;
972: break;
973: case 'd':
974: if (action) {
975: help();
1.1.1.8 root 976: return 0;
1.1.1.5 root 977: }
978: action = SNAPSHOT_DELETE;
979: snapshot_name = optarg;
980: break;
981: }
982: }
983:
984: if (optind >= argc)
985: help();
986: filename = argv[optind++];
987:
988: /* Open the image */
989: bs = bdrv_new("");
990: if (!bs)
991: error("Not enough memory");
992:
993: if (bdrv_open2(bs, filename, 0, NULL) < 0) {
994: error("Could not open '%s'", filename);
995: }
996:
997: /* Perform the requested action */
998: switch(action) {
999: case SNAPSHOT_LIST:
1000: dump_snapshots(bs);
1001: break;
1002:
1003: case SNAPSHOT_CREATE:
1004: memset(&sn, 0, sizeof(sn));
1005: pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
1006:
1007: qemu_gettimeofday(&tv);
1008: sn.date_sec = tv.tv_sec;
1009: sn.date_nsec = tv.tv_usec * 1000;
1010:
1011: ret = bdrv_snapshot_create(bs, &sn);
1012: if (ret)
1013: error("Could not create snapshot '%s': %d (%s)",
1014: snapshot_name, ret, strerror(-ret));
1015: break;
1016:
1017: case SNAPSHOT_APPLY:
1018: ret = bdrv_snapshot_goto(bs, snapshot_name);
1019: if (ret)
1020: error("Could not apply snapshot '%s': %d (%s)",
1021: snapshot_name, ret, strerror(-ret));
1022: break;
1023:
1024: case SNAPSHOT_DELETE:
1025: ret = bdrv_snapshot_delete(bs, snapshot_name);
1026: if (ret)
1027: error("Could not delete snapshot '%s': %d (%s)",
1028: snapshot_name, ret, strerror(-ret));
1029: break;
1030: }
1031:
1032: /* Cleanup */
1033: bdrv_delete(bs);
1.1.1.8 root 1034:
1035: return 0;
1.1.1.5 root 1036: }
1037:
1.1.1.8 root 1038: static const img_cmd_t img_cmds[] = {
1039: #define DEF(option, callback, arg_string) \
1040: { option, callback },
1041: #include "qemu-img-cmds.h"
1042: #undef DEF
1043: #undef GEN_DOCS
1044: { NULL, NULL, },
1045: };
1046:
1.1 root 1047: int main(int argc, char **argv)
1048: {
1.1.1.8 root 1049: const img_cmd_t *cmd;
1050: const char *cmdname;
1.1 root 1051:
1052: bdrv_init();
1053: if (argc < 2)
1054: help();
1.1.1.8 root 1055: cmdname = argv[1];
1.1.1.5 root 1056: argc--; argv++;
1.1.1.8 root 1057:
1058: /* find the command */
1059: for(cmd = img_cmds; cmd->name != NULL; cmd++) {
1060: if (!strcmp(cmdname, cmd->name)) {
1061: return cmd->handler(argc, argv);
1062: }
1.1 root 1063: }
1.1.1.8 root 1064:
1065: /* not found */
1066: help();
1.1 root 1067: return 0;
1068: }
unix.superglobalmegacorp.com
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to qemu-img.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Qemu by Fabrice Bellard] / qemu