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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"
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;
1.1.1.8 ! root 164: int disk_type = VHD_DYNAMIC;
1.1 root 165:
1.1.1.4 root 166: if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE)
1.1 root 167: goto fail;
168:
169: footer = (struct vhd_footer*) s->footer_buf;
1.1.1.8 ! root 170: if (strncmp(footer->creator, "conectix", 8)) {
! 171: int64_t offset = bdrv_getlength(bs->file);
! 172: if (offset < HEADER_SIZE) {
! 173: goto fail;
! 174: }
! 175: /* If a fixed disk, the footer is found only at the end of the file */
! 176: if (bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, HEADER_SIZE)
! 177: != HEADER_SIZE) {
! 178: goto fail;
! 179: }
! 180: if (strncmp(footer->creator, "conectix", 8)) {
! 181: goto fail;
! 182: }
! 183: disk_type = VHD_FIXED;
! 184: }
1.1 root 185:
186: checksum = be32_to_cpu(footer->checksum);
187: footer->checksum = 0;
188: if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
189: fprintf(stderr, "block-vpc: The header checksum of '%s' is "
1.1.1.4 root 190: "incorrect.\n", bs->filename);
1.1 root 191:
1.1.1.8 ! root 192: /* Write 'checksum' back to footer, or else will leave it with zero. */
! 193: footer->checksum = be32_to_cpu(checksum);
! 194:
1.1 root 195: // The visible size of a image in Virtual PC depends on the geometry
196: // rather than on the size stored in the footer (the size in the footer
197: // is too large usually)
198: bs->total_sectors = (int64_t)
199: be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl;
200:
1.1.1.7 root 201: if (bs->total_sectors >= 65535 * 16 * 255) {
202: err = -EFBIG;
203: goto fail;
204: }
205:
1.1.1.8 ! root 206: if (disk_type == VHD_DYNAMIC) {
! 207: if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
! 208: HEADER_SIZE) != HEADER_SIZE) {
! 209: goto fail;
! 210: }
1.1 root 211:
1.1.1.8 ! root 212: dyndisk_header = (struct vhd_dyndisk_header *) buf;
1.1 root 213:
1.1.1.8 ! root 214: if (strncmp(dyndisk_header->magic, "cxsparse", 8)) {
! 215: goto fail;
! 216: }
1.1 root 217:
1.1.1.8 ! root 218: s->block_size = be32_to_cpu(dyndisk_header->block_size);
! 219: s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511;
1.1 root 220:
1.1.1.8 ! root 221: s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries);
! 222: s->pagetable = g_malloc(s->max_table_entries * 4);
1.1 root 223:
1.1.1.8 ! root 224: s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
! 225: if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
! 226: s->max_table_entries * 4) != s->max_table_entries * 4) {
! 227: goto fail;
! 228: }
1.1 root 229:
1.1.1.8 ! root 230: s->free_data_block_offset =
! 231: (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511;
1.1 root 232:
1.1.1.8 ! root 233: for (i = 0; i < s->max_table_entries; i++) {
! 234: be32_to_cpus(&s->pagetable[i]);
! 235: if (s->pagetable[i] != 0xFFFFFFFF) {
! 236: int64_t next = (512 * (int64_t) s->pagetable[i]) +
! 237: s->bitmap_size + s->block_size;
! 238:
! 239: if (next > s->free_data_block_offset) {
! 240: s->free_data_block_offset = next;
! 241: }
! 242: }
1.1 root 243: }
244:
1.1.1.8 ! root 245: s->last_bitmap_offset = (int64_t) -1;
1.1 root 246:
247: #ifdef CACHE
1.1.1.8 ! root 248: s->pageentry_u8 = g_malloc(512);
! 249: s->pageentry_u32 = s->pageentry_u8;
! 250: s->pageentry_u16 = s->pageentry_u8;
! 251: s->last_pagetable = -1;
1.1 root 252: #endif
1.1.1.8 ! root 253: }
1.1 root 254:
1.1.1.7 root 255: qemu_co_mutex_init(&s->lock);
256:
257: /* Disable migration when VHD images are used */
258: error_set(&s->migration_blocker,
259: QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
260: "vpc", bs->device_name, "live migration");
261: migrate_add_blocker(s->migration_blocker);
262:
1.1 root 263: return 0;
264: fail:
1.1.1.7 root 265: return err;
1.1 root 266: }
267:
268: /*
269: * Returns the absolute byte offset of the given sector in the image file.
270: * If the sector is not allocated, -1 is returned instead.
271: *
272: * The parameter write must be 1 if the offset will be used for a write
273: * operation (the block bitmaps is updated then), 0 otherwise.
274: */
275: static inline int64_t get_sector_offset(BlockDriverState *bs,
276: int64_t sector_num, int write)
277: {
278: BDRVVPCState *s = bs->opaque;
279: uint64_t offset = sector_num * 512;
280: uint64_t bitmap_offset, block_offset;
281: uint32_t pagetable_index, pageentry_index;
282:
283: pagetable_index = offset / s->block_size;
284: pageentry_index = (offset % s->block_size) / 512;
285:
286: if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff)
287: return -1; // not allocated
288:
289: bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
290: block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
291:
292: // We must ensure that we don't write to any sectors which are marked as
293: // unused in the bitmap. We get away with setting all bits in the block
294: // bitmap each time we write to a new block. This might cause Virtual PC to
295: // miss sparse read optimization, but it's not a problem in terms of
296: // correctness.
297: if (write && (s->last_bitmap_offset != bitmap_offset)) {
298: uint8_t bitmap[s->bitmap_size];
299:
300: s->last_bitmap_offset = bitmap_offset;
301: memset(bitmap, 0xff, s->bitmap_size);
1.1.1.4 root 302: bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size);
1.1 root 303: }
304:
305: // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
306: // sector_num, pagetable_index, pageentry_index,
307: // bitmap_offset, block_offset);
308:
309: // disabled by reason
310: #if 0
311: #ifdef CACHE
312: if (bitmap_offset != s->last_bitmap)
313: {
314: lseek(s->fd, bitmap_offset, SEEK_SET);
315:
316: s->last_bitmap = bitmap_offset;
317:
318: // Scary! Bitmap is stored as big endian 32bit entries,
319: // while we used to look it up byte by byte
320: read(s->fd, s->pageentry_u8, 512);
321: for (i = 0; i < 128; i++)
322: be32_to_cpus(&s->pageentry_u32[i]);
323: }
324:
325: if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
326: return -1;
327: #else
328: lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
329:
330: read(s->fd, &bitmap_entry, 1);
331:
332: if ((bitmap_entry >> (pageentry_index % 8)) & 1)
333: return -1; // not allocated
334: #endif
335: #endif
336:
337: return block_offset;
338: }
339:
340: /*
341: * Writes the footer to the end of the image file. This is needed when the
342: * file grows as it overwrites the old footer
343: *
344: * Returns 0 on success and < 0 on error
345: */
346: static int rewrite_footer(BlockDriverState* bs)
347: {
348: int ret;
349: BDRVVPCState *s = bs->opaque;
350: int64_t offset = s->free_data_block_offset;
351:
1.1.1.4 root 352: ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
1.1 root 353: if (ret < 0)
354: return ret;
355:
356: return 0;
357: }
358:
359: /*
360: * Allocates a new block. This involves writing a new footer and updating
361: * the Block Allocation Table to use the space at the old end of the image
362: * file (overwriting the old footer)
363: *
364: * Returns the sectors' offset in the image file on success and < 0 on error
365: */
366: static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
367: {
368: BDRVVPCState *s = bs->opaque;
369: int64_t bat_offset;
370: uint32_t index, bat_value;
371: int ret;
372: uint8_t bitmap[s->bitmap_size];
373:
374: // Check if sector_num is valid
375: if ((sector_num < 0) || (sector_num > bs->total_sectors))
376: return -1;
377:
378: // Write entry into in-memory BAT
379: index = (sector_num * 512) / s->block_size;
380: if (s->pagetable[index] != 0xFFFFFFFF)
381: return -1;
382:
383: s->pagetable[index] = s->free_data_block_offset / 512;
384:
385: // Initialize the block's bitmap
386: memset(bitmap, 0xff, s->bitmap_size);
1.1.1.7 root 387: ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap,
1.1.1.3 root 388: s->bitmap_size);
1.1.1.7 root 389: if (ret < 0) {
390: return ret;
391: }
1.1 root 392:
393: // Write new footer (the old one will be overwritten)
394: s->free_data_block_offset += s->block_size + s->bitmap_size;
395: ret = rewrite_footer(bs);
396: if (ret < 0)
397: goto fail;
398:
399: // Write BAT entry to disk
400: bat_offset = s->bat_offset + (4 * index);
401: bat_value = be32_to_cpu(s->pagetable[index]);
1.1.1.4 root 402: ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
1.1 root 403: if (ret < 0)
404: goto fail;
405:
406: return get_sector_offset(bs, sector_num, 0);
407:
408: fail:
409: s->free_data_block_offset -= (s->block_size + s->bitmap_size);
410: return -1;
411: }
412:
413: static int vpc_read(BlockDriverState *bs, int64_t sector_num,
414: uint8_t *buf, int nb_sectors)
415: {
416: BDRVVPCState *s = bs->opaque;
417: int ret;
418: int64_t offset;
1.1.1.4 root 419: int64_t sectors, sectors_per_block;
1.1.1.8 ! root 420: struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
1.1 root 421:
1.1.1.8 ! root 422: if (cpu_to_be32(footer->type) == VHD_FIXED) {
! 423: return bdrv_read(bs->file, sector_num, buf, nb_sectors);
! 424: }
1.1 root 425: while (nb_sectors > 0) {
426: offset = get_sector_offset(bs, sector_num, 0);
427:
1.1.1.4 root 428: sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
429: sectors = sectors_per_block - (sector_num % sectors_per_block);
430: if (sectors > nb_sectors) {
431: sectors = nb_sectors;
432: }
433:
1.1 root 434: if (offset == -1) {
1.1.1.4 root 435: memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
1.1 root 436: } else {
1.1.1.4 root 437: ret = bdrv_pread(bs->file, offset, buf,
438: sectors * BDRV_SECTOR_SIZE);
439: if (ret != sectors * BDRV_SECTOR_SIZE) {
1.1 root 440: return -1;
1.1.1.4 root 441: }
1.1 root 442: }
443:
1.1.1.4 root 444: nb_sectors -= sectors;
445: sector_num += sectors;
446: buf += sectors * BDRV_SECTOR_SIZE;
1.1 root 447: }
448: return 0;
449: }
450:
1.1.1.7 root 451: static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num,
452: uint8_t *buf, int nb_sectors)
453: {
454: int ret;
455: BDRVVPCState *s = bs->opaque;
456: qemu_co_mutex_lock(&s->lock);
457: ret = vpc_read(bs, sector_num, buf, nb_sectors);
458: qemu_co_mutex_unlock(&s->lock);
459: return ret;
460: }
461:
1.1 root 462: static int vpc_write(BlockDriverState *bs, int64_t sector_num,
463: const uint8_t *buf, int nb_sectors)
464: {
465: BDRVVPCState *s = bs->opaque;
466: int64_t offset;
1.1.1.4 root 467: int64_t sectors, sectors_per_block;
1.1 root 468: int ret;
1.1.1.8 ! root 469: struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf;
1.1 root 470:
1.1.1.8 ! root 471: if (cpu_to_be32(footer->type) == VHD_FIXED) {
! 472: return bdrv_write(bs->file, sector_num, buf, nb_sectors);
! 473: }
1.1 root 474: while (nb_sectors > 0) {
475: offset = get_sector_offset(bs, sector_num, 1);
476:
1.1.1.4 root 477: sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
478: sectors = sectors_per_block - (sector_num % sectors_per_block);
479: if (sectors > nb_sectors) {
480: sectors = nb_sectors;
481: }
482:
1.1 root 483: if (offset == -1) {
484: offset = alloc_block(bs, sector_num);
485: if (offset < 0)
486: return -1;
487: }
488:
1.1.1.4 root 489: ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE);
490: if (ret != sectors * BDRV_SECTOR_SIZE) {
1.1 root 491: return -1;
1.1.1.4 root 492: }
1.1 root 493:
1.1.1.4 root 494: nb_sectors -= sectors;
495: sector_num += sectors;
496: buf += sectors * BDRV_SECTOR_SIZE;
1.1 root 497: }
498:
499: return 0;
500: }
501:
1.1.1.7 root 502: static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num,
503: const uint8_t *buf, int nb_sectors)
504: {
505: int ret;
506: BDRVVPCState *s = bs->opaque;
507: qemu_co_mutex_lock(&s->lock);
508: ret = vpc_write(bs, sector_num, buf, nb_sectors);
509: qemu_co_mutex_unlock(&s->lock);
510: return ret;
511: }
512:
1.1 root 513: /*
514: * Calculates the number of cylinders, heads and sectors per cylinder
515: * based on a given number of sectors. This is the algorithm described
516: * in the VHD specification.
517: *
518: * Note that the geometry doesn't always exactly match total_sectors but
519: * may round it down.
520: *
521: * Returns 0 on success, -EFBIG if the size is larger than 127 GB
522: */
523: static int calculate_geometry(int64_t total_sectors, uint16_t* cyls,
524: uint8_t* heads, uint8_t* secs_per_cyl)
525: {
526: uint32_t cyls_times_heads;
527:
528: if (total_sectors > 65535 * 16 * 255)
529: return -EFBIG;
530:
531: if (total_sectors > 65535 * 16 * 63) {
532: *secs_per_cyl = 255;
533: *heads = 16;
534: cyls_times_heads = total_sectors / *secs_per_cyl;
535: } else {
536: *secs_per_cyl = 17;
537: cyls_times_heads = total_sectors / *secs_per_cyl;
538: *heads = (cyls_times_heads + 1023) / 1024;
539:
540: if (*heads < 4)
541: *heads = 4;
542:
543: if (cyls_times_heads >= (*heads * 1024) || *heads > 16) {
544: *secs_per_cyl = 31;
545: *heads = 16;
546: cyls_times_heads = total_sectors / *secs_per_cyl;
547: }
548:
549: if (cyls_times_heads >= (*heads * 1024)) {
550: *secs_per_cyl = 63;
551: *heads = 16;
552: cyls_times_heads = total_sectors / *secs_per_cyl;
553: }
554: }
555:
1.1.1.3 root 556: *cyls = cyls_times_heads / *heads;
1.1 root 557:
558: return 0;
559: }
560:
1.1.1.8 ! root 561: static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors)
1.1 root 562: {
563: struct vhd_dyndisk_header* dyndisk_header =
564: (struct vhd_dyndisk_header*) buf;
565: size_t block_size, num_bat_entries;
1.1.1.8 ! root 566: int i;
1.1.1.5 root 567: int ret = -EIO;
1.1 root 568:
569: // Write the footer (twice: at the beginning and at the end)
570: block_size = 0x200000;
571: num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512);
572:
1.1.1.5 root 573: if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
574: goto fail;
575: }
1.1 root 576:
1.1.1.5 root 577: if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) {
578: goto fail;
579: }
580: if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
581: goto fail;
582: }
1.1 root 583:
584: // Write the initial BAT
1.1.1.5 root 585: if (lseek(fd, 3 * 512, SEEK_SET) < 0) {
586: goto fail;
587: }
1.1 root 588:
589: memset(buf, 0xFF, 512);
1.1.1.5 root 590: for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) {
591: if (write(fd, buf, 512) != 512) {
592: goto fail;
593: }
594: }
1.1 root 595:
596: // Prepare the Dynamic Disk Header
597: memset(buf, 0, 1024);
598:
1.1.1.2 root 599: memcpy(dyndisk_header->magic, "cxsparse", 8);
1.1 root 600:
1.1.1.7 root 601: /*
602: * Note: The spec is actually wrong here for data_offset, it says
603: * 0xFFFFFFFF, but MS tools expect all 64 bits to be set.
604: */
605: dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
1.1 root 606: dyndisk_header->table_offset = be64_to_cpu(3 * 512);
607: dyndisk_header->version = be32_to_cpu(0x00010000);
608: dyndisk_header->block_size = be32_to_cpu(block_size);
609: dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries);
610:
611: dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
612:
613: // Write the header
1.1.1.5 root 614: if (lseek(fd, 512, SEEK_SET) < 0) {
615: goto fail;
616: }
617:
618: if (write(fd, buf, 1024) != 1024) {
619: goto fail;
620: }
621: ret = 0;
1.1 root 622:
1.1.1.5 root 623: fail:
1.1.1.8 ! root 624: return ret;
! 625: }
! 626:
! 627: static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size)
! 628: {
! 629: int ret = -EIO;
! 630:
! 631: /* Add footer to total size */
! 632: total_size += 512;
! 633: if (ftruncate(fd, total_size) != 0) {
! 634: ret = -errno;
! 635: goto fail;
! 636: }
! 637: if (lseek(fd, -512, SEEK_END) < 0) {
! 638: goto fail;
! 639: }
! 640: if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
! 641: goto fail;
! 642: }
! 643:
! 644: ret = 0;
! 645:
! 646: fail:
! 647: return ret;
! 648: }
! 649:
! 650: static int vpc_create(const char *filename, QEMUOptionParameter *options)
! 651: {
! 652: uint8_t buf[1024];
! 653: struct vhd_footer *footer = (struct vhd_footer *) buf;
! 654: QEMUOptionParameter *disk_type_param;
! 655: int fd, i;
! 656: uint16_t cyls = 0;
! 657: uint8_t heads = 0;
! 658: uint8_t secs_per_cyl = 0;
! 659: int64_t total_sectors;
! 660: int64_t total_size;
! 661: int disk_type;
! 662: int ret = -EIO;
! 663:
! 664: /* Read out options */
! 665: total_size = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n;
! 666:
! 667: disk_type_param = get_option_parameter(options, BLOCK_OPT_SUBFMT);
! 668: if (disk_type_param && disk_type_param->value.s) {
! 669: if (!strcmp(disk_type_param->value.s, "dynamic")) {
! 670: disk_type = VHD_DYNAMIC;
! 671: } else if (!strcmp(disk_type_param->value.s, "fixed")) {
! 672: disk_type = VHD_FIXED;
! 673: } else {
! 674: return -EINVAL;
! 675: }
! 676: } else {
! 677: disk_type = VHD_DYNAMIC;
! 678: }
! 679:
! 680: /* Create the file */
! 681: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
! 682: if (fd < 0) {
! 683: return -EIO;
! 684: }
! 685:
! 686: /*
! 687: * Calculate matching total_size and geometry. Increase the number of
! 688: * sectors requested until we get enough (or fail). This ensures that
! 689: * qemu-img convert doesn't truncate images, but rather rounds up.
! 690: */
! 691: total_sectors = total_size / BDRV_SECTOR_SIZE;
! 692: for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) {
! 693: if (calculate_geometry(total_sectors + i, &cyls, &heads,
! 694: &secs_per_cyl))
! 695: {
! 696: ret = -EFBIG;
! 697: goto fail;
! 698: }
! 699: }
! 700:
! 701: total_sectors = (int64_t) cyls * heads * secs_per_cyl;
! 702:
! 703: /* Prepare the Hard Disk Footer */
! 704: memset(buf, 0, 1024);
! 705:
! 706: memcpy(footer->creator, "conectix", 8);
! 707: /* TODO Check if "qemu" creator_app is ok for VPC */
! 708: memcpy(footer->creator_app, "qemu", 4);
! 709: memcpy(footer->creator_os, "Wi2k", 4);
! 710:
! 711: footer->features = be32_to_cpu(0x02);
! 712: footer->version = be32_to_cpu(0x00010000);
! 713: if (disk_type == VHD_DYNAMIC) {
! 714: footer->data_offset = be64_to_cpu(HEADER_SIZE);
! 715: } else {
! 716: footer->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
! 717: }
! 718: footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
! 719:
! 720: /* Version of Virtual PC 2007 */
! 721: footer->major = be16_to_cpu(0x0005);
! 722: footer->minor = be16_to_cpu(0x0003);
! 723: if (disk_type == VHD_DYNAMIC) {
! 724: footer->orig_size = be64_to_cpu(total_sectors * 512);
! 725: footer->size = be64_to_cpu(total_sectors * 512);
! 726: } else {
! 727: footer->orig_size = be64_to_cpu(total_size);
! 728: footer->size = be64_to_cpu(total_size);
! 729: }
! 730: footer->cyls = be16_to_cpu(cyls);
! 731: footer->heads = heads;
! 732: footer->secs_per_cyl = secs_per_cyl;
! 733:
! 734: footer->type = be32_to_cpu(disk_type);
! 735:
! 736: /* TODO uuid is missing */
! 737:
! 738: footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE));
! 739:
! 740: if (disk_type == VHD_DYNAMIC) {
! 741: ret = create_dynamic_disk(fd, buf, total_sectors);
! 742: } else {
! 743: ret = create_fixed_disk(fd, buf, total_size);
! 744: }
! 745:
! 746: fail:
1.1 root 747: close(fd);
1.1.1.5 root 748: return ret;
1.1 root 749: }
750:
751: static void vpc_close(BlockDriverState *bs)
752: {
753: BDRVVPCState *s = bs->opaque;
1.1.1.7 root 754: g_free(s->pagetable);
1.1 root 755: #ifdef CACHE
1.1.1.7 root 756: g_free(s->pageentry_u8);
1.1 root 757: #endif
1.1.1.7 root 758:
759: migrate_del_blocker(s->migration_blocker);
760: error_free(s->migration_blocker);
1.1 root 761: }
762:
763: static QEMUOptionParameter vpc_create_options[] = {
764: {
765: .name = BLOCK_OPT_SIZE,
766: .type = OPT_SIZE,
767: .help = "Virtual disk size"
768: },
1.1.1.8 ! root 769: {
! 770: .name = BLOCK_OPT_SUBFMT,
! 771: .type = OPT_STRING,
! 772: .help =
! 773: "Type of virtual hard disk format. Supported formats are "
! 774: "{dynamic (default) | fixed} "
! 775: },
1.1 root 776: { NULL }
777: };
778:
779: static BlockDriver bdrv_vpc = {
1.1.1.5 root 780: .format_name = "vpc",
781: .instance_size = sizeof(BDRVVPCState),
1.1.1.7 root 782:
1.1.1.5 root 783: .bdrv_probe = vpc_probe,
784: .bdrv_open = vpc_open,
785: .bdrv_close = vpc_close,
786: .bdrv_create = vpc_create,
1.1 root 787:
1.1.1.7 root 788: .bdrv_read = vpc_co_read,
789: .bdrv_write = vpc_co_write,
790:
1.1 root 791: .create_options = vpc_create_options,
792: };
793:
794: static void bdrv_vpc_init(void)
795: {
796: bdrv_register(&bdrv_vpc);
797: }
798:
799: block_init(bdrv_vpc_init);
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