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1.1 root 1: /*
1.1.1.2 root 2: * Block driver for Connectix / Microsoft Virtual PC images
1.1 root 3: *
4: * Copyright (c) 2005 Alex Beregszaszi
5: * Copyright (c) 2009 Kevin Wolf <[email protected]>
6: *
7: * Permission is hereby granted, free of charge, to any person obtaining a copy
8: * of this software and associated documentation files (the "Software"), to deal
9: * in the Software without restriction, including without limitation the rights
10: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11: * copies of the Software, and to permit persons to whom the Software is
12: * furnished to do so, subject to the following conditions:
13: *
14: * The above copyright notice and this permission notice shall be included in
15: * all copies or substantial portions of the Software.
16: *
17: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20: * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23: * THE SOFTWARE.
24: */
25: #include "qemu-common.h"
26: #include "block_int.h"
27: #include "module.h"
28:
29: /**************************************************************/
30:
31: #define HEADER_SIZE 512
32:
33: //#define CACHE
34:
35: enum vhd_type {
36: VHD_FIXED = 2,
37: VHD_DYNAMIC = 3,
38: VHD_DIFFERENCING = 4,
39: };
40:
41: // Seconds since Jan 1, 2000 0:00:00 (UTC)
42: #define VHD_TIMESTAMP_BASE 946684800
43:
44: // always big-endian
45: struct vhd_footer {
46: char creator[8]; // "conectix"
47: uint32_t features;
48: uint32_t version;
49:
50: // Offset of next header structure, 0xFFFFFFFF if none
51: uint64_t data_offset;
52:
53: // Seconds since Jan 1, 2000 0:00:00 (UTC)
54: uint32_t timestamp;
55:
56: char creator_app[4]; // "vpc "
57: uint16_t major;
58: uint16_t minor;
59: char creator_os[4]; // "Wi2k"
60:
61: uint64_t orig_size;
62: uint64_t size;
63:
64: uint16_t cyls;
65: uint8_t heads;
66: uint8_t secs_per_cyl;
67:
68: uint32_t type;
69:
70: // Checksum of the Hard Disk Footer ("one's complement of the sum of all
71: // the bytes in the footer without the checksum field")
72: uint32_t checksum;
73:
74: // UUID used to identify a parent hard disk (backing file)
75: uint8_t uuid[16];
76:
77: uint8_t in_saved_state;
78: };
79:
80: struct vhd_dyndisk_header {
81: char magic[8]; // "cxsparse"
82:
83: // Offset of next header structure, 0xFFFFFFFF if none
84: uint64_t data_offset;
85:
86: // Offset of the Block Allocation Table (BAT)
87: uint64_t table_offset;
88:
89: uint32_t version;
90: uint32_t max_table_entries; // 32bit/entry
91:
92: // 2 MB by default, must be a power of two
93: uint32_t block_size;
94:
95: uint32_t checksum;
96: uint8_t parent_uuid[16];
97: uint32_t parent_timestamp;
98: uint32_t reserved;
99:
100: // Backing file name (in UTF-16)
101: uint8_t parent_name[512];
102:
103: struct {
104: uint32_t platform;
105: uint32_t data_space;
106: uint32_t data_length;
107: uint32_t reserved;
108: uint64_t data_offset;
109: } parent_locator[8];
110: };
111:
112: typedef struct BDRVVPCState {
113: uint8_t footer_buf[HEADER_SIZE];
114: uint64_t free_data_block_offset;
115: int max_table_entries;
116: uint32_t *pagetable;
117: uint64_t bat_offset;
118: uint64_t last_bitmap_offset;
119:
120: uint32_t block_size;
121: uint32_t bitmap_size;
122:
123: #ifdef CACHE
124: uint8_t *pageentry_u8;
125: uint32_t *pageentry_u32;
126: uint16_t *pageentry_u16;
127:
128: uint64_t last_bitmap;
129: #endif
130: } BDRVVPCState;
131:
132: static uint32_t vpc_checksum(uint8_t* buf, size_t size)
133: {
134: uint32_t res = 0;
135: int i;
136:
137: for (i = 0; i < size; i++)
138: res += buf[i];
139:
140: return ~res;
141: }
142:
143:
144: static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
145: {
146: if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8))
147: return 100;
148: return 0;
149: }
150:
1.1.1.4 root 151: static int vpc_open(BlockDriverState *bs, int flags)
1.1 root 152: {
153: BDRVVPCState *s = bs->opaque;
1.1.1.4 root 154: int i;
1.1 root 155: struct vhd_footer* footer;
156: struct vhd_dyndisk_header* dyndisk_header;
157: uint8_t buf[HEADER_SIZE];
158: uint32_t checksum;
159:
1.1.1.4 root 160: if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
1.1 root 161: goto fail;
162:
163: footer = (struct vhd_footer*) s->footer_buf;
164: if (strncmp(footer->creator, "conectix", 8))
165: goto fail;
166:
167: checksum = be32_to_cpu(footer->checksum);
168: footer->checksum = 0;
169: if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
170: fprintf(stderr, "block-vpc: The header checksum of '%s' is "
1.1.1.4 root 171: "incorrect.\n", bs->filename);
1.1 root 172:
173: // The visible size of a image in Virtual PC depends on the geometry
174: // rather than on the size stored in the footer (the size in the footer
175: // is too large usually)
176: bs->total_sectors = (int64_t)
177: be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
178:
1.1.1.4 root 179: if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
1.1 root 180: != HEADER_SIZE)
181: goto fail;
182:
183: dyndisk_header = (struct vhd_dyndisk_header*) buf;
184:
185: if (strncmp(dyndisk_header->magic, "cxsparse", 8))
186: goto fail;
187:
188:
189: s->block_size = be32_to_cpu(dyndisk_header->block_size);
190: s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
191:
192: s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
193: s->pagetable = qemu_malloc(s->max_table_entries * 4);
194:
195: s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
1.1.1.4 root 196: if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
1.1 root 197: s->max_table_entries * 4) != s->max_table_entries * 4)
198: goto fail;
199:
200: s->free_data_block_offset =
201: (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511;
202:
203: for (i = 0; i < s->max_table_entries; i++) {
204: be32_to_cpus(&s->pagetable[i]);
205: if (s->pagetable[i] != 0xFFFFFFFF) {
206: int64_t next = (512 * (int64_t) s->pagetable[i]) +
207: s->bitmap_size + s->block_size;
208:
209: if (next> s->free_data_block_offset)
210: s->free_data_block_offset = next;
211: }
212: }
213:
214: s->last_bitmap_offset = (int64_t) -1;
215:
216: #ifdef CACHE
217: s->pageentry_u8 = qemu_malloc(512);
218: s->pageentry_u32 = s->pageentry_u8;
219: s->pageentry_u16 = s->pageentry_u8;
220: s->last_pagetable = -1;
221: #endif
222:
223: return 0;
224: fail:
225: return -1;
226: }
227:
228: /*
229: * Returns the absolute byte offset of the given sector in the image file.
230: * If the sector is not allocated, -1 is returned instead.
231: *
232: * The parameter write must be 1 if the offset will be used for a write
233: * operation (the block bitmaps is updated then), 0 otherwise.
234: */
235: static inline int64_t get_sector_offset(BlockDriverState *bs,
236: int64_t sector_num, int write)
237: {
238: BDRVVPCState *s = bs->opaque;
239: uint64_t offset = sector_num * 512;
240: uint64_t bitmap_offset, block_offset;
241: uint32_t pagetable_index, pageentry_index;
242:
243: pagetable_index = offset / s->block_size;
244: pageentry_index = (offset % s->block_size) / 512;
245:
246: if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff)
247: return -1; // not allocated
248:
249: bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
250: block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
251:
252: // We must ensure that we don't write to any sectors which are marked as
253: // unused in the bitmap. We get away with setting all bits in the block
254: // bitmap each time we write to a new block. This might cause Virtual PC to
255: // miss sparse read optimization, but it's not a problem in terms of
256: // correctness.
257: if (write && (s->last_bitmap_offset != bitmap_offset)) {
258: uint8_t bitmap[s->bitmap_size];
259:
260: s->last_bitmap_offset = bitmap_offset;
261: memset(bitmap, 0xff, s->bitmap_size);
1.1.1.4 root 262: bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size);
1.1 root 263: }
264:
265: // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
266: // sector_num, pagetable_index, pageentry_index,
267: // bitmap_offset, block_offset);
268:
269: // disabled by reason
270: #if 0
271: #ifdef CACHE
272: if (bitmap_offset != s->last_bitmap)
273: {
274: lseek(s->fd, bitmap_offset, SEEK_SET);
275:
276: s->last_bitmap = bitmap_offset;
277:
278: // Scary! Bitmap is stored as big endian 32bit entries,
279: // while we used to look it up byte by byte
280: read(s->fd, s->pageentry_u8, 512);
281: for (i = 0; i < 128; i++)
282: be32_to_cpus(&s->pageentry_u32[i]);
283: }
284:
285: if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
286: return -1;
287: #else
288: lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
289:
290: read(s->fd, &bitmap_entry, 1);
291:
292: if ((bitmap_entry >> (pageentry_index % 8)) & 1)
293: return -1; // not allocated
294: #endif
295: #endif
296:
297: return block_offset;
298: }
299:
300: /*
301: * Writes the footer to the end of the image file. This is needed when the
302: * file grows as it overwrites the old footer
303: *
304: * Returns 0 on success and < 0 on error
305: */
306: static int rewrite_footer(BlockDriverState* bs)
307: {
308: int ret;
309: BDRVVPCState *s = bs->opaque;
310: int64_t offset = s->free_data_block_offset;
311:
1.1.1.4 root 312: ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
1.1 root 313: if (ret < 0)
314: return ret;
315:
316: return 0;
317: }
318:
319: /*
320: * Allocates a new block. This involves writing a new footer and updating
321: * the Block Allocation Table to use the space at the old end of the image
322: * file (overwriting the old footer)
323: *
324: * Returns the sectors' offset in the image file on success and < 0 on error
325: */
326: static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
327: {
328: BDRVVPCState *s = bs->opaque;
329: int64_t bat_offset;
330: uint32_t index, bat_value;
331: int ret;
332: uint8_t bitmap[s->bitmap_size];
333:
334: // Check if sector_num is valid
335: if ((sector_num < 0) || (sector_num > bs->total_sectors))
336: return -1;
337:
338: // Write entry into in-memory BAT
339: index = (sector_num * 512) / s->block_size;
340: if (s->pagetable[index] != 0xFFFFFFFF)
341: return -1;
342:
343: s->pagetable[index] = s->free_data_block_offset / 512;
344:
345: // Initialize the block's bitmap
346: memset(bitmap, 0xff, s->bitmap_size);
1.1.1.4 root 347: bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap,
1.1.1.3 root 348: s->bitmap_size);
1.1 root 349:
350: // Write new footer (the old one will be overwritten)
351: s->free_data_block_offset += s->block_size + s->bitmap_size;
352: ret = rewrite_footer(bs);
353: if (ret < 0)
354: goto fail;
355:
356: // Write BAT entry to disk
357: bat_offset = s->bat_offset + (4 * index);
358: bat_value = be32_to_cpu(s->pagetable[index]);
1.1.1.4 root 359: ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
1.1 root 360: if (ret < 0)
361: goto fail;
362:
363: return get_sector_offset(bs, sector_num, 0);
364:
365: fail:
366: s->free_data_block_offset -= (s->block_size + s->bitmap_size);
367: return -1;
368: }
369:
370: static int vpc_read(BlockDriverState *bs, int64_t sector_num,
371: uint8_t *buf, int nb_sectors)
372: {
373: BDRVVPCState *s = bs->opaque;
374: int ret;
375: int64_t offset;
1.1.1.4 root 376: int64_t sectors, sectors_per_block;
1.1 root 377:
378: while (nb_sectors > 0) {
379: offset = get_sector_offset(bs, sector_num, 0);
380:
1.1.1.4 root 381: sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
382: sectors = sectors_per_block - (sector_num % sectors_per_block);
383: if (sectors > nb_sectors) {
384: sectors = nb_sectors;
385: }
386:
1.1 root 387: if (offset == -1) {
1.1.1.4 root 388: memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
1.1 root 389: } else {
1.1.1.4 root 390: ret = bdrv_pread(bs->file, offset, buf,
391: sectors * BDRV_SECTOR_SIZE);
392: if (ret != sectors * BDRV_SECTOR_SIZE) {
1.1 root 393: return -1;
1.1.1.4 root 394: }
1.1 root 395: }
396:
1.1.1.4 root 397: nb_sectors -= sectors;
398: sector_num += sectors;
399: buf += sectors * BDRV_SECTOR_SIZE;
1.1 root 400: }
401: return 0;
402: }
403:
404: static int vpc_write(BlockDriverState *bs, int64_t sector_num,
405: const uint8_t *buf, int nb_sectors)
406: {
407: BDRVVPCState *s = bs->opaque;
408: int64_t offset;
1.1.1.4 root 409: int64_t sectors, sectors_per_block;
1.1 root 410: int ret;
411:
412: while (nb_sectors > 0) {
413: offset = get_sector_offset(bs, sector_num, 1);
414:
1.1.1.4 root 415: sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
416: sectors = sectors_per_block - (sector_num % sectors_per_block);
417: if (sectors > nb_sectors) {
418: sectors = nb_sectors;
419: }
420:
1.1 root 421: if (offset == -1) {
422: offset = alloc_block(bs, sector_num);
423: if (offset < 0)
424: return -1;
425: }
426:
1.1.1.4 root 427: ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE);
428: if (ret != sectors * BDRV_SECTOR_SIZE) {
1.1 root 429: return -1;
1.1.1.4 root 430: }
1.1 root 431:
1.1.1.4 root 432: nb_sectors -= sectors;
433: sector_num += sectors;
434: buf += sectors * BDRV_SECTOR_SIZE;
1.1 root 435: }
436:
437: return 0;
438: }
439:
1.1.1.5 root 440: static int vpc_flush(BlockDriverState *bs)
441: {
442: return bdrv_flush(bs->file);
443: }
1.1 root 444:
445: /*
446: * Calculates the number of cylinders, heads and sectors per cylinder
447: * based on a given number of sectors. This is the algorithm described
448: * in the VHD specification.
449: *
450: * Note that the geometry doesn't always exactly match total_sectors but
451: * may round it down.
452: *
453: * Returns 0 on success, -EFBIG if the size is larger than 127 GB
454: */
455: static int calculate_geometry(int64_t total_sectors, uint16_t* cyls,
456: uint8_t* heads, uint8_t* secs_per_cyl)
457: {
458: uint32_t cyls_times_heads;
459:
460: if (total_sectors > 65535 * 16 * 255)
461: return -EFBIG;
462:
463: if (total_sectors > 65535 * 16 * 63) {
464: *secs_per_cyl = 255;
465: *heads = 16;
466: cyls_times_heads = total_sectors / *secs_per_cyl;
467: } else {
468: *secs_per_cyl = 17;
469: cyls_times_heads = total_sectors / *secs_per_cyl;
470: *heads = (cyls_times_heads + 1023) / 1024;
471:
472: if (*heads < 4)
473: *heads = 4;
474:
475: if (cyls_times_heads >= (*heads * 1024) || *heads > 16) {
476: *secs_per_cyl = 31;
477: *heads = 16;
478: cyls_times_heads = total_sectors / *secs_per_cyl;
479: }
480:
481: if (cyls_times_heads >= (*heads * 1024)) {
482: *secs_per_cyl = 63;
483: *heads = 16;
484: cyls_times_heads = total_sectors / *secs_per_cyl;
485: }
486: }
487:
1.1.1.3 root 488: *cyls = cyls_times_heads / *heads;
1.1 root 489:
490: return 0;
491: }
492:
493: static int vpc_create(const char *filename, QEMUOptionParameter *options)
494: {
495: uint8_t buf[1024];
496: struct vhd_footer* footer = (struct vhd_footer*) buf;
497: struct vhd_dyndisk_header* dyndisk_header =
498: (struct vhd_dyndisk_header*) buf;
499: int fd, i;
1.1.1.3 root 500: uint16_t cyls = 0;
501: uint8_t heads = 0;
502: uint8_t secs_per_cyl = 0;
1.1 root 503: size_t block_size, num_bat_entries;
504: int64_t total_sectors = 0;
1.1.1.5 root 505: int ret = -EIO;
1.1 root 506:
507: // Read out options
1.1.1.6 ! root 508: total_sectors = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n /
! 509: BDRV_SECTOR_SIZE;
1.1 root 510:
511: // Create the file
512: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
513: if (fd < 0)
514: return -EIO;
515:
1.1.1.3 root 516: /* Calculate matching total_size and geometry. Increase the number of
517: sectors requested until we get enough (or fail). */
518: for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) {
519: if (calculate_geometry(total_sectors + i,
520: &cyls, &heads, &secs_per_cyl)) {
1.1.1.5 root 521: ret = -EFBIG;
522: goto fail;
1.1.1.3 root 523: }
524: }
1.1 root 525: total_sectors = (int64_t) cyls * heads * secs_per_cyl;
526:
527: // Prepare the Hard Disk Footer
528: memset(buf, 0, 1024);
529:
1.1.1.2 root 530: memcpy(footer->creator, "conectix", 8);
1.1 root 531: // TODO Check if "qemu" creator_app is ok for VPC
1.1.1.2 root 532: memcpy(footer->creator_app, "qemu", 4);
533: memcpy(footer->creator_os, "Wi2k", 4);
1.1 root 534:
535: footer->features = be32_to_cpu(0x02);
536: footer->version = be32_to_cpu(0x00010000);
537: footer->data_offset = be64_to_cpu(HEADER_SIZE);
538: footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
539:
540: // Version of Virtual PC 2007
541: footer->major = be16_to_cpu(0x0005);
542: footer->minor =be16_to_cpu(0x0003);
543:
544: footer->orig_size = be64_to_cpu(total_sectors * 512);
545: footer->size = be64_to_cpu(total_sectors * 512);
546:
547: footer->cyls = be16_to_cpu(cyls);
548: footer->heads = heads;
549: footer->secs_per_cyl = secs_per_cyl;
550:
551: footer->type = be32_to_cpu(VHD_DYNAMIC);
552:
553: // TODO uuid is missing
554:
555: footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
556:
557: // Write the footer (twice: at the beginning and at the end)
558: block_size = 0x200000;
559: num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
560:
1.1.1.5 root 561: if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
562: goto fail;
563: }
1.1 root 564:
1.1.1.5 root 565: if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) {
566: goto fail;
567: }
568: if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
569: goto fail;
570: }
1.1 root 571:
572: // Write the initial BAT
1.1.1.5 root 573: if (lseek(fd, 3 * 512, SEEK_SET) < 0) {
574: goto fail;
575: }
1.1 root 576:
577: memset(buf, 0xFF, 512);
1.1.1.5 root 578: for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) {
579: if (write(fd, buf, 512) != 512) {
580: goto fail;
581: }
582: }
1.1 root 583:
584:
585: // Prepare the Dynamic Disk Header
586: memset(buf, 0, 1024);
587:
1.1.1.2 root 588: memcpy(dyndisk_header->magic, "cxsparse", 8);
1.1 root 589:
590: dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF);
591: dyndisk_header->table_offset = be64_to_cpu(3 * 512);
592: dyndisk_header->version = be32_to_cpu(0x00010000);
593: dyndisk_header->block_size = be32_to_cpu(block_size);
594: dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries);
595:
596: dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
597:
598: // Write the header
1.1.1.5 root 599: if (lseek(fd, 512, SEEK_SET) < 0) {
600: goto fail;
601: }
602:
603: if (write(fd, buf, 1024) != 1024) {
604: goto fail;
605: }
606: ret = 0;
1.1 root 607:
1.1.1.5 root 608: fail:
1.1 root 609: close(fd);
1.1.1.5 root 610: return ret;
1.1 root 611: }
612:
613: static void vpc_close(BlockDriverState *bs)
614: {
615: BDRVVPCState *s = bs->opaque;
616: qemu_free(s->pagetable);
617: #ifdef CACHE
618: qemu_free(s->pageentry_u8);
619: #endif
620: }
621:
622: static QEMUOptionParameter vpc_create_options[] = {
623: {
624: .name = BLOCK_OPT_SIZE,
625: .type = OPT_SIZE,
626: .help = "Virtual disk size"
627: },
628: { NULL }
629: };
630:
631: static BlockDriver bdrv_vpc = {
1.1.1.5 root 632: .format_name = "vpc",
633: .instance_size = sizeof(BDRVVPCState),
634: .bdrv_probe = vpc_probe,
635: .bdrv_open = vpc_open,
636: .bdrv_read = vpc_read,
637: .bdrv_write = vpc_write,
638: .bdrv_flush = vpc_flush,
639: .bdrv_close = vpc_close,
640: .bdrv_create = vpc_create,
1.1 root 641:
642: .create_options = vpc_create_options,
643: };
644:
645: static void bdrv_vpc_init(void)
646: {
647: bdrv_register(&bdrv_vpc);
648: }
649:
650: block_init(bdrv_vpc_init);
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