![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to vpc.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Qemu by Fabrice Bellard] / qemu / block|
Return to vpc.c CVS log | Up to [Qemu by Fabrice Bellard] / qemu / block |
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"
1.1.1.7 ! root 28: #include "migration.h"
1.1 root 29:
30: /**************************************************************/
31:
32: #define HEADER_SIZE 512
33:
34: //#define CACHE
35:
36: enum vhd_type {
37: VHD_FIXED = 2,
38: VHD_DYNAMIC = 3,
39: VHD_DIFFERENCING = 4,
40: };
41:
42: // Seconds since Jan 1, 2000 0:00:00 (UTC)
43: #define VHD_TIMESTAMP_BASE 946684800
44:
45: // always big-endian
46: struct vhd_footer {
47: char creator[8]; // "conectix"
48: uint32_t features;
49: uint32_t version;
50:
51: // Offset of next header structure, 0xFFFFFFFF if none
52: uint64_t data_offset;
53:
54: // Seconds since Jan 1, 2000 0:00:00 (UTC)
55: uint32_t timestamp;
56:
57: char creator_app[4]; // "vpc "
58: uint16_t major;
59: uint16_t minor;
60: char creator_os[4]; // "Wi2k"
61:
62: uint64_t orig_size;
63: uint64_t size;
64:
65: uint16_t cyls;
66: uint8_t heads;
67: uint8_t secs_per_cyl;
68:
69: uint32_t type;
70:
71: // Checksum of the Hard Disk Footer ("one's complement of the sum of all
72: // the bytes in the footer without the checksum field")
73: uint32_t checksum;
74:
75: // UUID used to identify a parent hard disk (backing file)
76: uint8_t uuid[16];
77:
78: uint8_t in_saved_state;
79: };
80:
81: struct vhd_dyndisk_header {
82: char magic[8]; // "cxsparse"
83:
84: // Offset of next header structure, 0xFFFFFFFF if none
85: uint64_t data_offset;
86:
87: // Offset of the Block Allocation Table (BAT)
88: uint64_t table_offset;
89:
90: uint32_t version;
91: uint32_t max_table_entries; // 32bit/entry
92:
93: // 2 MB by default, must be a power of two
94: uint32_t block_size;
95:
96: uint32_t checksum;
97: uint8_t parent_uuid[16];
98: uint32_t parent_timestamp;
99: uint32_t reserved;
100:
101: // Backing file name (in UTF-16)
102: uint8_t parent_name[512];
103:
104: struct {
105: uint32_t platform;
106: uint32_t data_space;
107: uint32_t data_length;
108: uint32_t reserved;
109: uint64_t data_offset;
110: } parent_locator[8];
111: };
112:
113: typedef struct BDRVVPCState {
1.1.1.7 ! root 114: CoMutex lock;
1.1 root 115: uint8_t footer_buf[HEADER_SIZE];
116: uint64_t free_data_block_offset;
117: int max_table_entries;
118: uint32_t *pagetable;
119: uint64_t bat_offset;
120: uint64_t last_bitmap_offset;
121:
122: uint32_t block_size;
123: uint32_t bitmap_size;
124:
125: #ifdef CACHE
126: uint8_t *pageentry_u8;
127: uint32_t *pageentry_u32;
128: uint16_t *pageentry_u16;
129:
130: uint64_t last_bitmap;
131: #endif
1.1.1.7 ! root 132:
! 133: Error *migration_blocker;
1.1 root 134: } BDRVVPCState;
135:
136: static uint32_t vpc_checksum(uint8_t* buf, size_t size)
137: {
138: uint32_t res = 0;
139: int i;
140:
141: for (i = 0; i < size; i++)
142: res += buf[i];
143:
144: return ~res;
145: }
146:
147:
148: static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
149: {
150: if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8))
151: return 100;
152: return 0;
153: }
154:
1.1.1.4 root 155: static int vpc_open(BlockDriverState *bs, int flags)
1.1 root 156: {
157: BDRVVPCState *s = bs->opaque;
1.1.1.4 root 158: int i;
1.1 root 159: struct vhd_footer* footer;
160: struct vhd_dyndisk_header* dyndisk_header;
161: uint8_t buf[HEADER_SIZE];
162: uint32_t checksum;
1.1.1.7 ! root 163: int err = -1;
1.1 root 164:
1.1.1.4 root 165: if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
1.1 root 166: goto fail;
167:
168: footer = (struct vhd_footer*) s->footer_buf;
169: if (strncmp(footer->creator, "conectix", 8))
170: goto fail;
171:
172: checksum = be32_to_cpu(footer->checksum);
173: footer->checksum = 0;
174: if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
175: fprintf(stderr, "block-vpc: The header checksum of '%s' is "
1.1.1.4 root 176: "incorrect.\n", bs->filename);
1.1 root 177:
178: // The visible size of a image in Virtual PC depends on the geometry
179: // rather than on the size stored in the footer (the size in the footer
180: // is too large usually)
181: bs->total_sectors = (int64_t)
182: be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
183:
1.1.1.7 ! root 184: if (bs->total_sectors >= 65535 * 16 * 255) {
! 185: err = -EFBIG;
! 186: goto fail;
! 187: }
! 188:
1.1.1.4 root 189: if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE)
1.1 root 190: != HEADER_SIZE)
191: goto fail;
192:
193: dyndisk_header = (struct vhd_dyndisk_header*) buf;
194:
195: if (strncmp(dyndisk_header->magic, "cxsparse", 8))
196: goto fail;
197:
198:
199: s->block_size = be32_to_cpu(dyndisk_header->block_size);
200: s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
201:
202: s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
1.1.1.7 ! root 203: s->pagetable = g_malloc(s->max_table_entries * 4);
1.1 root 204:
205: s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
1.1.1.4 root 206: if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
1.1 root 207: s->max_table_entries * 4) != s->max_table_entries * 4)
208: goto fail;
209:
210: s->free_data_block_offset =
211: (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511;
212:
213: for (i = 0; i < s->max_table_entries; i++) {
214: be32_to_cpus(&s->pagetable[i]);
215: if (s->pagetable[i] != 0xFFFFFFFF) {
216: int64_t next = (512 * (int64_t) s->pagetable[i]) +
217: s->bitmap_size + s->block_size;
218:
219: if (next> s->free_data_block_offset)
220: s->free_data_block_offset = next;
221: }
222: }
223:
224: s->last_bitmap_offset = (int64_t) -1;
225:
226: #ifdef CACHE
1.1.1.7 ! root 227: s->pageentry_u8 = g_malloc(512);
1.1 root 228: s->pageentry_u32 = s->pageentry_u8;
229: s->pageentry_u16 = s->pageentry_u8;
230: s->last_pagetable = -1;
231: #endif
232:
1.1.1.7 ! root 233: qemu_co_mutex_init(&s->lock);
! 234:
! 235: /* Disable migration when VHD images are used */
! 236: error_set(&s->migration_blocker,
! 237: QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
! 238: "vpc", bs->device_name, "live migration");
! 239: migrate_add_blocker(s->migration_blocker);
! 240:
1.1 root 241: return 0;
242: fail:
1.1.1.7 ! root 243: return err;
1.1 root 244: }
245:
246: /*
247: * Returns the absolute byte offset of the given sector in the image file.
248: * If the sector is not allocated, -1 is returned instead.
249: *
250: * The parameter write must be 1 if the offset will be used for a write
251: * operation (the block bitmaps is updated then), 0 otherwise.
252: */
253: static inline int64_t get_sector_offset(BlockDriverState *bs,
254: int64_t sector_num, int write)
255: {
256: BDRVVPCState *s = bs->opaque;
257: uint64_t offset = sector_num * 512;
258: uint64_t bitmap_offset, block_offset;
259: uint32_t pagetable_index, pageentry_index;
260:
261: pagetable_index = offset / s->block_size;
262: pageentry_index = (offset % s->block_size) / 512;
263:
264: if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff)
265: return -1; // not allocated
266:
267: bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
268: block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
269:
270: // We must ensure that we don't write to any sectors which are marked as
271: // unused in the bitmap. We get away with setting all bits in the block
272: // bitmap each time we write to a new block. This might cause Virtual PC to
273: // miss sparse read optimization, but it's not a problem in terms of
274: // correctness.
275: if (write && (s->last_bitmap_offset != bitmap_offset)) {
276: uint8_t bitmap[s->bitmap_size];
277:
278: s->last_bitmap_offset = bitmap_offset;
279: memset(bitmap, 0xff, s->bitmap_size);
1.1.1.4 root 280: bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size);
1.1 root 281: }
282:
283: // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
284: // sector_num, pagetable_index, pageentry_index,
285: // bitmap_offset, block_offset);
286:
287: // disabled by reason
288: #if 0
289: #ifdef CACHE
290: if (bitmap_offset != s->last_bitmap)
291: {
292: lseek(s->fd, bitmap_offset, SEEK_SET);
293:
294: s->last_bitmap = bitmap_offset;
295:
296: // Scary! Bitmap is stored as big endian 32bit entries,
297: // while we used to look it up byte by byte
298: read(s->fd, s->pageentry_u8, 512);
299: for (i = 0; i < 128; i++)
300: be32_to_cpus(&s->pageentry_u32[i]);
301: }
302:
303: if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
304: return -1;
305: #else
306: lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
307:
308: read(s->fd, &bitmap_entry, 1);
309:
310: if ((bitmap_entry >> (pageentry_index % 8)) & 1)
311: return -1; // not allocated
312: #endif
313: #endif
314:
315: return block_offset;
316: }
317:
318: /*
319: * Writes the footer to the end of the image file. This is needed when the
320: * file grows as it overwrites the old footer
321: *
322: * Returns 0 on success and < 0 on error
323: */
324: static int rewrite_footer(BlockDriverState* bs)
325: {
326: int ret;
327: BDRVVPCState *s = bs->opaque;
328: int64_t offset = s->free_data_block_offset;
329:
1.1.1.4 root 330: ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
1.1 root 331: if (ret < 0)
332: return ret;
333:
334: return 0;
335: }
336:
337: /*
338: * Allocates a new block. This involves writing a new footer and updating
339: * the Block Allocation Table to use the space at the old end of the image
340: * file (overwriting the old footer)
341: *
342: * Returns the sectors' offset in the image file on success and < 0 on error
343: */
344: static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
345: {
346: BDRVVPCState *s = bs->opaque;
347: int64_t bat_offset;
348: uint32_t index, bat_value;
349: int ret;
350: uint8_t bitmap[s->bitmap_size];
351:
352: // Check if sector_num is valid
353: if ((sector_num < 0) || (sector_num > bs->total_sectors))
354: return -1;
355:
356: // Write entry into in-memory BAT
357: index = (sector_num * 512) / s->block_size;
358: if (s->pagetable[index] != 0xFFFFFFFF)
359: return -1;
360:
361: s->pagetable[index] = s->free_data_block_offset / 512;
362:
363: // Initialize the block's bitmap
364: memset(bitmap, 0xff, s->bitmap_size);
1.1.1.7 ! root 365: ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap,
1.1.1.3 root 366: s->bitmap_size);
1.1.1.7 ! root 367: if (ret < 0) {
! 368: return ret;
! 369: }
1.1 root 370:
371: // Write new footer (the old one will be overwritten)
372: s->free_data_block_offset += s->block_size + s->bitmap_size;
373: ret = rewrite_footer(bs);
374: if (ret < 0)
375: goto fail;
376:
377: // Write BAT entry to disk
378: bat_offset = s->bat_offset + (4 * index);
379: bat_value = be32_to_cpu(s->pagetable[index]);
1.1.1.4 root 380: ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
1.1 root 381: if (ret < 0)
382: goto fail;
383:
384: return get_sector_offset(bs, sector_num, 0);
385:
386: fail:
387: s->free_data_block_offset -= (s->block_size + s->bitmap_size);
388: return -1;
389: }
390:
391: static int vpc_read(BlockDriverState *bs, int64_t sector_num,
392: uint8_t *buf, int nb_sectors)
393: {
394: BDRVVPCState *s = bs->opaque;
395: int ret;
396: int64_t offset;
1.1.1.4 root 397: int64_t sectors, sectors_per_block;
1.1 root 398:
399: while (nb_sectors > 0) {
400: offset = get_sector_offset(bs, sector_num, 0);
401:
1.1.1.4 root 402: sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
403: sectors = sectors_per_block - (sector_num % sectors_per_block);
404: if (sectors > nb_sectors) {
405: sectors = nb_sectors;
406: }
407:
1.1 root 408: if (offset == -1) {
1.1.1.4 root 409: memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
1.1 root 410: } else {
1.1.1.4 root 411: ret = bdrv_pread(bs->file, offset, buf,
412: sectors * BDRV_SECTOR_SIZE);
413: if (ret != sectors * BDRV_SECTOR_SIZE) {
1.1 root 414: return -1;
1.1.1.4 root 415: }
1.1 root 416: }
417:
1.1.1.4 root 418: nb_sectors -= sectors;
419: sector_num += sectors;
420: buf += sectors * BDRV_SECTOR_SIZE;
1.1 root 421: }
422: return 0;
423: }
424:
1.1.1.7 ! root 425: static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num,
! 426: uint8_t *buf, int nb_sectors)
! 427: {
! 428: int ret;
! 429: BDRVVPCState *s = bs->opaque;
! 430: qemu_co_mutex_lock(&s->lock);
! 431: ret = vpc_read(bs, sector_num, buf, nb_sectors);
! 432: qemu_co_mutex_unlock(&s->lock);
! 433: return ret;
! 434: }
! 435:
1.1 root 436: static int vpc_write(BlockDriverState *bs, int64_t sector_num,
437: const uint8_t *buf, int nb_sectors)
438: {
439: BDRVVPCState *s = bs->opaque;
440: int64_t offset;
1.1.1.4 root 441: int64_t sectors, sectors_per_block;
1.1 root 442: int ret;
443:
444: while (nb_sectors > 0) {
445: offset = get_sector_offset(bs, sector_num, 1);
446:
1.1.1.4 root 447: sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
448: sectors = sectors_per_block - (sector_num % sectors_per_block);
449: if (sectors > nb_sectors) {
450: sectors = nb_sectors;
451: }
452:
1.1 root 453: if (offset == -1) {
454: offset = alloc_block(bs, sector_num);
455: if (offset < 0)
456: return -1;
457: }
458:
1.1.1.4 root 459: ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE);
460: if (ret != sectors * BDRV_SECTOR_SIZE) {
1.1 root 461: return -1;
1.1.1.4 root 462: }
1.1 root 463:
1.1.1.4 root 464: nb_sectors -= sectors;
465: sector_num += sectors;
466: buf += sectors * BDRV_SECTOR_SIZE;
1.1 root 467: }
468:
469: return 0;
470: }
471:
1.1.1.7 ! root 472: static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num,
! 473: const uint8_t *buf, int nb_sectors)
! 474: {
! 475: int ret;
! 476: BDRVVPCState *s = bs->opaque;
! 477: qemu_co_mutex_lock(&s->lock);
! 478: ret = vpc_write(bs, sector_num, buf, nb_sectors);
! 479: qemu_co_mutex_unlock(&s->lock);
! 480: return ret;
! 481: }
! 482:
! 483: static coroutine_fn int vpc_co_flush(BlockDriverState *bs)
1.1.1.5 root 484: {
1.1.1.7 ! root 485: return bdrv_co_flush(bs->file);
1.1.1.5 root 486: }
1.1 root 487:
488: /*
489: * Calculates the number of cylinders, heads and sectors per cylinder
490: * based on a given number of sectors. This is the algorithm described
491: * in the VHD specification.
492: *
493: * Note that the geometry doesn't always exactly match total_sectors but
494: * may round it down.
495: *
496: * Returns 0 on success, -EFBIG if the size is larger than 127 GB
497: */
498: static int calculate_geometry(int64_t total_sectors, uint16_t* cyls,
499: uint8_t* heads, uint8_t* secs_per_cyl)
500: {
501: uint32_t cyls_times_heads;
502:
503: if (total_sectors > 65535 * 16 * 255)
504: return -EFBIG;
505:
506: if (total_sectors > 65535 * 16 * 63) {
507: *secs_per_cyl = 255;
508: *heads = 16;
509: cyls_times_heads = total_sectors / *secs_per_cyl;
510: } else {
511: *secs_per_cyl = 17;
512: cyls_times_heads = total_sectors / *secs_per_cyl;
513: *heads = (cyls_times_heads + 1023) / 1024;
514:
515: if (*heads < 4)
516: *heads = 4;
517:
518: if (cyls_times_heads >= (*heads * 1024) || *heads > 16) {
519: *secs_per_cyl = 31;
520: *heads = 16;
521: cyls_times_heads = total_sectors / *secs_per_cyl;
522: }
523:
524: if (cyls_times_heads >= (*heads * 1024)) {
525: *secs_per_cyl = 63;
526: *heads = 16;
527: cyls_times_heads = total_sectors / *secs_per_cyl;
528: }
529: }
530:
1.1.1.3 root 531: *cyls = cyls_times_heads / *heads;
1.1 root 532:
533: return 0;
534: }
535:
536: static int vpc_create(const char *filename, QEMUOptionParameter *options)
537: {
538: uint8_t buf[1024];
539: struct vhd_footer* footer = (struct vhd_footer*) buf;
540: struct vhd_dyndisk_header* dyndisk_header =
541: (struct vhd_dyndisk_header*) buf;
542: int fd, i;
1.1.1.3 root 543: uint16_t cyls = 0;
544: uint8_t heads = 0;
545: uint8_t secs_per_cyl = 0;
1.1 root 546: size_t block_size, num_bat_entries;
547: int64_t total_sectors = 0;
1.1.1.5 root 548: int ret = -EIO;
1.1 root 549:
550: // Read out options
1.1.1.6 root 551: total_sectors = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n /
552: BDRV_SECTOR_SIZE;
1.1 root 553:
554: // Create the file
555: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
556: if (fd < 0)
557: return -EIO;
558:
1.1.1.3 root 559: /* Calculate matching total_size and geometry. Increase the number of
560: sectors requested until we get enough (or fail). */
561: for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) {
562: if (calculate_geometry(total_sectors + i,
563: &cyls, &heads, &secs_per_cyl)) {
1.1.1.5 root 564: ret = -EFBIG;
565: goto fail;
1.1.1.3 root 566: }
567: }
1.1 root 568: total_sectors = (int64_t) cyls * heads * secs_per_cyl;
569:
570: // Prepare the Hard Disk Footer
571: memset(buf, 0, 1024);
572:
1.1.1.2 root 573: memcpy(footer->creator, "conectix", 8);
1.1 root 574: // TODO Check if "qemu" creator_app is ok for VPC
1.1.1.2 root 575: memcpy(footer->creator_app, "qemu", 4);
576: memcpy(footer->creator_os, "Wi2k", 4);
1.1 root 577:
578: footer->features = be32_to_cpu(0x02);
579: footer->version = be32_to_cpu(0x00010000);
580: footer->data_offset = be64_to_cpu(HEADER_SIZE);
581: footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
582:
583: // Version of Virtual PC 2007
584: footer->major = be16_to_cpu(0x0005);
585: footer->minor =be16_to_cpu(0x0003);
586:
587: footer->orig_size = be64_to_cpu(total_sectors * 512);
588: footer->size = be64_to_cpu(total_sectors * 512);
589:
590: footer->cyls = be16_to_cpu(cyls);
591: footer->heads = heads;
592: footer->secs_per_cyl = secs_per_cyl;
593:
594: footer->type = be32_to_cpu(VHD_DYNAMIC);
595:
596: // TODO uuid is missing
597:
598: footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
599:
600: // Write the footer (twice: at the beginning and at the end)
601: block_size = 0x200000;
602: num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
603:
1.1.1.5 root 604: if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
605: goto fail;
606: }
1.1 root 607:
1.1.1.5 root 608: if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) {
609: goto fail;
610: }
611: if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
612: goto fail;
613: }
1.1 root 614:
615: // Write the initial BAT
1.1.1.5 root 616: if (lseek(fd, 3 * 512, SEEK_SET) < 0) {
617: goto fail;
618: }
1.1 root 619:
620: memset(buf, 0xFF, 512);
1.1.1.5 root 621: for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) {
622: if (write(fd, buf, 512) != 512) {
623: goto fail;
624: }
625: }
1.1 root 626:
627:
628: // Prepare the Dynamic Disk Header
629: memset(buf, 0, 1024);
630:
1.1.1.2 root 631: memcpy(dyndisk_header->magic, "cxsparse", 8);
1.1 root 632:
1.1.1.7 ! root 633: /*
! 634: * Note: The spec is actually wrong here for data_offset, it says
! 635: * 0xFFFFFFFF, but MS tools expect all 64 bits to be set.
! 636: */
! 637: dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
1.1 root 638: dyndisk_header->table_offset = be64_to_cpu(3 * 512);
639: dyndisk_header->version = be32_to_cpu(0x00010000);
640: dyndisk_header->block_size = be32_to_cpu(block_size);
641: dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries);
642:
643: dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
644:
645: // Write the header
1.1.1.5 root 646: if (lseek(fd, 512, SEEK_SET) < 0) {
647: goto fail;
648: }
649:
650: if (write(fd, buf, 1024) != 1024) {
651: goto fail;
652: }
653: ret = 0;
1.1 root 654:
1.1.1.5 root 655: fail:
1.1 root 656: close(fd);
1.1.1.5 root 657: return ret;
1.1 root 658: }
659:
660: static void vpc_close(BlockDriverState *bs)
661: {
662: BDRVVPCState *s = bs->opaque;
1.1.1.7 ! root 663: g_free(s->pagetable);
1.1 root 664: #ifdef CACHE
1.1.1.7 ! root 665: g_free(s->pageentry_u8);
1.1 root 666: #endif
1.1.1.7 ! root 667:
! 668: migrate_del_blocker(s->migration_blocker);
! 669: error_free(s->migration_blocker);
1.1 root 670: }
671:
672: static QEMUOptionParameter vpc_create_options[] = {
673: {
674: .name = BLOCK_OPT_SIZE,
675: .type = OPT_SIZE,
676: .help = "Virtual disk size"
677: },
678: { NULL }
679: };
680:
681: static BlockDriver bdrv_vpc = {
1.1.1.5 root 682: .format_name = "vpc",
683: .instance_size = sizeof(BDRVVPCState),
1.1.1.7 ! root 684:
1.1.1.5 root 685: .bdrv_probe = vpc_probe,
686: .bdrv_open = vpc_open,
687: .bdrv_close = vpc_close,
688: .bdrv_create = vpc_create,
1.1 root 689:
1.1.1.7 ! root 690: .bdrv_read = vpc_co_read,
! 691: .bdrv_write = vpc_co_write,
! 692: .bdrv_co_flush_to_disk = vpc_co_flush,
! 693:
1.1 root 694: .create_options = vpc_create_options,
695: };
696:
697: static void bdrv_vpc_init(void)
698: {
699: bdrv_register(&bdrv_vpc);
700: }
701:
702: block_init(bdrv_vpc_init);
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.