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Commit | Line | Data |
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6a0f9e82 FB |
1 | /* |
2 | * Block driver for Conectix/Microsoft Virtual PC images | |
5fafdf24 | 3 | * |
6a0f9e82 | 4 | * Copyright (c) 2005 Alex Beregszaszi |
15d35bc5 | 5 | * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> |
5fafdf24 | 6 | * |
6a0f9e82 FB |
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 | */ | |
faf07963 | 25 | #include "qemu-common.h" |
6a0f9e82 FB |
26 | #include "block_int.h" |
27 | ||
28 | /**************************************************************/ | |
29 | ||
30 | #define HEADER_SIZE 512 | |
31 | ||
32 | //#define CACHE | |
33 | ||
2cfacb62 AL |
34 | enum vhd_type { |
35 | VHD_FIXED = 2, | |
36 | VHD_DYNAMIC = 3, | |
37 | VHD_DIFFERENCING = 4, | |
38 | }; | |
39 | ||
57c7d9e5 AL |
40 | // Seconds since Jan 1, 2000 0:00:00 (UTC) |
41 | #define VHD_TIMESTAMP_BASE 946684800 | |
42 | ||
6a0f9e82 | 43 | // always big-endian |
b9fa33a6 | 44 | struct vhd_footer { |
2cfacb62 AL |
45 | char creator[8]; // "conectix" |
46 | uint32_t features; | |
47 | uint32_t version; | |
48 | ||
49 | // Offset of next header structure, 0xFFFFFFFF if none | |
50 | uint64_t data_offset; | |
51 | ||
52 | // Seconds since Jan 1, 2000 0:00:00 (UTC) | |
53 | uint32_t timestamp; | |
54 | ||
55 | char creator_app[4]; // "vpc " | |
56 | uint16_t major; | |
57 | uint16_t minor; | |
58 | char creator_os[4]; // "Wi2k" | |
59 | ||
60 | uint64_t orig_size; | |
61 | uint64_t size; | |
62 | ||
63 | uint16_t cyls; | |
64 | uint8_t heads; | |
65 | uint8_t secs_per_cyl; | |
66 | ||
67 | uint32_t type; | |
68 | ||
69 | // Checksum of the Hard Disk Footer ("one's complement of the sum of all | |
70 | // the bytes in the footer without the checksum field") | |
71 | uint32_t checksum; | |
72 | ||
73 | // UUID used to identify a parent hard disk (backing file) | |
74 | uint8_t uuid[16]; | |
75 | ||
76 | uint8_t in_saved_state; | |
b9fa33a6 AL |
77 | }; |
78 | ||
79 | struct vhd_dyndisk_header { | |
2cfacb62 AL |
80 | char magic[8]; // "cxsparse" |
81 | ||
82 | // Offset of next header structure, 0xFFFFFFFF if none | |
83 | uint64_t data_offset; | |
84 | ||
85 | // Offset of the Block Allocation Table (BAT) | |
86 | uint64_t table_offset; | |
87 | ||
88 | uint32_t version; | |
89 | uint32_t max_table_entries; // 32bit/entry | |
90 | ||
91 | // 2 MB by default, must be a power of two | |
92 | uint32_t block_size; | |
93 | ||
94 | uint32_t checksum; | |
95 | uint8_t parent_uuid[16]; | |
96 | uint32_t parent_timestamp; | |
97 | uint32_t reserved; | |
98 | ||
99 | // Backing file name (in UTF-16) | |
100 | uint8_t parent_name[512]; | |
101 | ||
102 | struct { | |
103 | uint32_t platform; | |
104 | uint32_t data_space; | |
105 | uint32_t data_length; | |
106 | uint32_t reserved; | |
107 | uint64_t data_offset; | |
108 | } parent_locator[8]; | |
6a0f9e82 FB |
109 | }; |
110 | ||
111 | typedef struct BDRVVPCState { | |
b71d1c2e | 112 | BlockDriverState *hd; |
3b46e624 | 113 | |
15d35bc5 AL |
114 | uint8_t footer_buf[HEADER_SIZE]; |
115 | uint64_t free_data_block_offset; | |
2cfacb62 | 116 | int max_table_entries; |
6a0f9e82 | 117 | uint32_t *pagetable; |
15d35bc5 AL |
118 | uint64_t bat_offset; |
119 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 120 | |
2cfacb62 | 121 | uint32_t block_size; |
15d35bc5 AL |
122 | uint32_t bitmap_size; |
123 | ||
6a0f9e82 FB |
124 | #ifdef CACHE |
125 | uint8_t *pageentry_u8; | |
126 | uint32_t *pageentry_u32; | |
127 | uint16_t *pageentry_u16; | |
3b46e624 | 128 | |
6a0f9e82 FB |
129 | uint64_t last_bitmap; |
130 | #endif | |
131 | } BDRVVPCState; | |
132 | ||
57c7d9e5 AL |
133 | static uint32_t vpc_checksum(uint8_t* buf, size_t size) |
134 | { | |
135 | uint32_t res = 0; | |
136 | int i; | |
137 | ||
138 | for (i = 0; i < size; i++) | |
139 | res += buf[i]; | |
140 | ||
141 | return ~res; | |
142 | } | |
143 | ||
144 | ||
6a0f9e82 FB |
145 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
146 | { | |
ffe8ab83 | 147 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
6a0f9e82 | 148 | return 100; |
6a0f9e82 FB |
149 | return 0; |
150 | } | |
151 | ||
83f64091 | 152 | static int vpc_open(BlockDriverState *bs, const char *filename, int flags) |
6a0f9e82 FB |
153 | { |
154 | BDRVVPCState *s = bs->opaque; | |
b71d1c2e | 155 | int ret, i; |
b9fa33a6 AL |
156 | struct vhd_footer* footer; |
157 | struct vhd_dyndisk_header* dyndisk_header; | |
158 | uint8_t buf[HEADER_SIZE]; | |
57c7d9e5 | 159 | uint32_t checksum; |
6a0f9e82 | 160 | |
b71d1c2e AL |
161 | ret = bdrv_file_open(&s->hd, filename, flags); |
162 | if (ret < 0) | |
163 | return ret; | |
6a0f9e82 | 164 | |
15d35bc5 | 165 | if (bdrv_pread(s->hd, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE) |
6a0f9e82 FB |
166 | goto fail; |
167 | ||
15d35bc5 | 168 | footer = (struct vhd_footer*) s->footer_buf; |
b9fa33a6 | 169 | if (strncmp(footer->creator, "conectix", 8)) |
6a0f9e82 | 170 | goto fail; |
6a0f9e82 | 171 | |
57c7d9e5 AL |
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 " | |
176 | "incorrect.\n", filename); | |
177 | ||
1fa79228 AL |
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 | ||
b71d1c2e AL |
184 | if (bdrv_pread(s->hd, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE) |
185 | != HEADER_SIZE) | |
6a0f9e82 FB |
186 | goto fail; |
187 | ||
b9fa33a6 AL |
188 | dyndisk_header = (struct vhd_dyndisk_header*) buf; |
189 | ||
190 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) | |
191 | goto fail; | |
6a0f9e82 | 192 | |
6a0f9e82 | 193 | |
15d35bc5 AL |
194 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
195 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; | |
196 | ||
2cfacb62 AL |
197 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
198 | s->pagetable = qemu_malloc(s->max_table_entries * 4); | |
6a0f9e82 | 199 | if (!s->pagetable) |
b71d1c2e AL |
200 | goto fail; |
201 | ||
15d35bc5 AL |
202 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
203 | if (bdrv_pread(s->hd, s->bat_offset, s->pagetable, | |
204 | s->max_table_entries * 4) != s->max_table_entries * 4) | |
b71d1c2e AL |
205 | goto fail; |
206 | ||
15d35bc5 AL |
207 | s->free_data_block_offset = |
208 | (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; | |
209 | ||
210 | for (i = 0; i < s->max_table_entries; i++) { | |
211 | be32_to_cpus(&s->pagetable[i]); | |
212 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
213 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
214 | s->bitmap_size + s->block_size; | |
215 | ||
216 | if (next> s->free_data_block_offset) | |
217 | s->free_data_block_offset = next; | |
218 | } | |
219 | } | |
220 | ||
221 | s->last_bitmap_offset = (int64_t) -1; | |
6a0f9e82 | 222 | |
6a0f9e82 FB |
223 | #ifdef CACHE |
224 | s->pageentry_u8 = qemu_malloc(512); | |
225 | if (!s->pageentry_u8) | |
226 | goto fail; | |
227 | s->pageentry_u32 = s->pageentry_u8; | |
228 | s->pageentry_u16 = s->pageentry_u8; | |
229 | s->last_pagetable = -1; | |
230 | #endif | |
231 | ||
232 | return 0; | |
233 | fail: | |
b71d1c2e | 234 | bdrv_delete(s->hd); |
6a0f9e82 FB |
235 | return -1; |
236 | } | |
237 | ||
b71d1c2e AL |
238 | /* |
239 | * Returns the absolute byte offset of the given sector in the image file. | |
240 | * If the sector is not allocated, -1 is returned instead. | |
15d35bc5 AL |
241 | * |
242 | * The parameter write must be 1 if the offset will be used for a write | |
243 | * operation (the block bitmaps is updated then), 0 otherwise. | |
b71d1c2e | 244 | */ |
15d35bc5 AL |
245 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
246 | int64_t sector_num, int write) | |
6a0f9e82 FB |
247 | { |
248 | BDRVVPCState *s = bs->opaque; | |
249 | uint64_t offset = sector_num * 512; | |
250 | uint64_t bitmap_offset, block_offset; | |
251 | uint32_t pagetable_index, pageentry_index; | |
252 | ||
2cfacb62 AL |
253 | pagetable_index = offset / s->block_size; |
254 | pageentry_index = (offset % s->block_size) / 512; | |
3b46e624 | 255 | |
15d35bc5 AL |
256 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
257 | return -1; // not allocated | |
6a0f9e82 | 258 | |
378e2aea | 259 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
15d35bc5 AL |
260 | block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); |
261 | ||
262 | // We must ensure that we don't write to any sectors which are marked as | |
263 | // unused in the bitmap. We get away with setting all bits in the block | |
264 | // bitmap each time we write to a new block. This might cause Virtual PC to | |
265 | // miss sparse read optimization, but it's not a problem in terms of | |
266 | // correctness. | |
267 | if (write && (s->last_bitmap_offset != bitmap_offset)) { | |
268 | uint8_t bitmap[s->bitmap_size]; | |
269 | ||
270 | s->last_bitmap_offset = bitmap_offset; | |
271 | memset(bitmap, 0xff, s->bitmap_size); | |
272 | bdrv_pwrite(s->hd, bitmap_offset, bitmap, s->bitmap_size); | |
273 | } | |
3b46e624 | 274 | |
26a76461 | 275 | // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", |
6a0f9e82 FB |
276 | // sector_num, pagetable_index, pageentry_index, |
277 | // bitmap_offset, block_offset); | |
278 | ||
279 | // disabled by reason | |
280 | #if 0 | |
281 | #ifdef CACHE | |
282 | if (bitmap_offset != s->last_bitmap) | |
283 | { | |
284 | lseek(s->fd, bitmap_offset, SEEK_SET); | |
285 | ||
286 | s->last_bitmap = bitmap_offset; | |
5fafdf24 | 287 | |
6a0f9e82 FB |
288 | // Scary! Bitmap is stored as big endian 32bit entries, |
289 | // while we used to look it up byte by byte | |
290 | read(s->fd, s->pageentry_u8, 512); | |
291 | for (i = 0; i < 128; i++) | |
292 | be32_to_cpus(&s->pageentry_u32[i]); | |
293 | } | |
294 | ||
295 | if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) | |
296 | return -1; | |
297 | #else | |
298 | lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); | |
5fafdf24 | 299 | |
6a0f9e82 FB |
300 | read(s->fd, &bitmap_entry, 1); |
301 | ||
302 | if ((bitmap_entry >> (pageentry_index % 8)) & 1) | |
303 | return -1; // not allocated | |
304 | #endif | |
305 | #endif | |
6a0f9e82 | 306 | |
b71d1c2e | 307 | return block_offset; |
6a0f9e82 FB |
308 | } |
309 | ||
15d35bc5 AL |
310 | /* |
311 | * Writes the footer to the end of the image file. This is needed when the | |
312 | * file grows as it overwrites the old footer | |
313 | * | |
314 | * Returns 0 on success and < 0 on error | |
315 | */ | |
316 | static int rewrite_footer(BlockDriverState* bs) | |
317 | { | |
318 | int ret; | |
319 | BDRVVPCState *s = bs->opaque; | |
320 | int64_t offset = s->free_data_block_offset; | |
321 | ||
322 | ret = bdrv_pwrite(s->hd, offset, s->footer_buf, HEADER_SIZE); | |
323 | if (ret < 0) | |
324 | return ret; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Allocates a new block. This involves writing a new footer and updating | |
331 | * the Block Allocation Table to use the space at the old end of the image | |
332 | * file (overwriting the old footer) | |
333 | * | |
334 | * Returns the sectors' offset in the image file on success and < 0 on error | |
335 | */ | |
336 | static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) | |
337 | { | |
338 | BDRVVPCState *s = bs->opaque; | |
339 | int64_t bat_offset; | |
340 | uint32_t index, bat_value; | |
341 | int ret; | |
342 | uint8_t bitmap[s->bitmap_size]; | |
343 | ||
344 | // Check if sector_num is valid | |
345 | if ((sector_num < 0) || (sector_num > bs->total_sectors)) | |
346 | return -1; | |
347 | ||
348 | // Write entry into in-memory BAT | |
349 | index = (sector_num * 512) / s->block_size; | |
350 | if (s->pagetable[index] != 0xFFFFFFFF) | |
351 | return -1; | |
352 | ||
353 | s->pagetable[index] = s->free_data_block_offset / 512; | |
354 | ||
355 | // Initialize the block's bitmap | |
356 | memset(bitmap, 0xff, s->bitmap_size); | |
357 | bdrv_pwrite(s->hd, s->free_data_block_offset, bitmap, s->bitmap_size); | |
358 | ||
359 | // Write new footer (the old one will be overwritten) | |
360 | s->free_data_block_offset += s->block_size + s->bitmap_size; | |
361 | ret = rewrite_footer(bs); | |
362 | if (ret < 0) | |
363 | goto fail; | |
364 | ||
365 | // Write BAT entry to disk | |
366 | bat_offset = s->bat_offset + (4 * index); | |
367 | bat_value = be32_to_cpu(s->pagetable[index]); | |
368 | ret = bdrv_pwrite(s->hd, bat_offset, &bat_value, 4); | |
369 | if (ret < 0) | |
370 | goto fail; | |
371 | ||
372 | return get_sector_offset(bs, sector_num, 0); | |
373 | ||
374 | fail: | |
375 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
376 | return -1; | |
377 | } | |
378 | ||
5fafdf24 | 379 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
6a0f9e82 FB |
380 | uint8_t *buf, int nb_sectors) |
381 | { | |
382 | BDRVVPCState *s = bs->opaque; | |
383 | int ret; | |
b71d1c2e | 384 | int64_t offset; |
6a0f9e82 FB |
385 | |
386 | while (nb_sectors > 0) { | |
15d35bc5 | 387 | offset = get_sector_offset(bs, sector_num, 0); |
b71d1c2e AL |
388 | |
389 | if (offset == -1) { | |
6a0f9e82 | 390 | memset(buf, 0, 512); |
b71d1c2e AL |
391 | } else { |
392 | ret = bdrv_pread(s->hd, offset, buf, 512); | |
393 | if (ret != 512) | |
394 | return -1; | |
395 | } | |
396 | ||
6a0f9e82 FB |
397 | nb_sectors--; |
398 | sector_num++; | |
399 | buf += 512; | |
400 | } | |
401 | return 0; | |
402 | } | |
403 | ||
15d35bc5 AL |
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; | |
409 | int ret; | |
410 | ||
411 | while (nb_sectors > 0) { | |
412 | offset = get_sector_offset(bs, sector_num, 1); | |
413 | ||
414 | if (offset == -1) { | |
415 | offset = alloc_block(bs, sector_num); | |
416 | if (offset < 0) | |
417 | return -1; | |
418 | } | |
419 | ||
420 | ret = bdrv_pwrite(s->hd, offset, buf, 512); | |
421 | if (ret != 512) | |
422 | return -1; | |
423 | ||
424 | nb_sectors--; | |
425 | sector_num++; | |
426 | buf += 512; | |
427 | } | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
57c7d9e5 AL |
432 | |
433 | /* | |
434 | * Calculates the number of cylinders, heads and sectors per cylinder | |
435 | * based on a given number of sectors. This is the algorithm described | |
436 | * in the VHD specification. | |
437 | * | |
438 | * Note that the geometry doesn't always exactly match total_sectors but | |
439 | * may round it down. | |
440 | */ | |
441 | static void calculate_geometry(int64_t total_sectors, uint16_t* cyls, | |
442 | uint8_t* heads, uint8_t* secs_per_cyl) | |
443 | { | |
444 | uint32_t cyls_times_heads; | |
445 | ||
446 | if (total_sectors > 65535 * 16 * 255) | |
447 | total_sectors = 65535 * 16 * 255; | |
448 | ||
449 | if (total_sectors > 65535 * 16 * 63) { | |
450 | *secs_per_cyl = 255; | |
451 | *heads = 16; | |
452 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
453 | } else { | |
454 | *secs_per_cyl = 17; | |
455 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
456 | *heads = (cyls_times_heads + 1023) / 1024; | |
457 | ||
458 | if (*heads < 4) | |
459 | *heads = 4; | |
460 | ||
461 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
462 | *secs_per_cyl = 31; | |
463 | *heads = 16; | |
464 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
465 | } | |
466 | ||
467 | if (cyls_times_heads >= (*heads * 1024)) { | |
468 | *secs_per_cyl = 63; | |
469 | *heads = 16; | |
470 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
471 | } | |
472 | } | |
473 | ||
474 | // Note: Rounding up deviates from the Virtual PC behaviour | |
475 | // However, we need this to avoid truncating images in qemu-img convert | |
476 | *cyls = (cyls_times_heads + *heads - 1) / *heads; | |
477 | } | |
478 | ||
479 | static int vpc_create(const char *filename, int64_t total_sectors, | |
480 | const char *backing_file, int flags) | |
481 | { | |
482 | uint8_t buf[1024]; | |
483 | struct vhd_footer* footer = (struct vhd_footer*) buf; | |
484 | struct vhd_dyndisk_header* dyndisk_header = | |
485 | (struct vhd_dyndisk_header*) buf; | |
486 | int fd, i; | |
487 | uint16_t cyls; | |
488 | uint8_t heads; | |
489 | uint8_t secs_per_cyl; | |
490 | size_t block_size, num_bat_entries; | |
491 | ||
492 | if (backing_file != NULL) | |
493 | return -ENOTSUP; | |
494 | ||
495 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); | |
496 | if (fd < 0) | |
497 | return -EIO; | |
498 | ||
499 | // Calculate matching total_size and geometry | |
500 | calculate_geometry(total_sectors, &cyls, &heads, &secs_per_cyl); | |
501 | total_sectors = (int64_t) cyls * heads * secs_per_cyl; | |
502 | ||
503 | // Prepare the Hard Disk Footer | |
504 | memset(buf, 0, 1024); | |
505 | ||
506 | strncpy(footer->creator, "conectix", 8); | |
507 | // TODO Check if "qemu" creator_app is ok for VPC | |
508 | strncpy(footer->creator_app, "qemu", 4); | |
509 | strncpy(footer->creator_os, "Wi2k", 4); | |
510 | ||
511 | footer->features = be32_to_cpu(0x02); | |
512 | footer->version = be32_to_cpu(0x00010000); | |
513 | footer->data_offset = be64_to_cpu(HEADER_SIZE); | |
514 | footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE); | |
515 | ||
516 | // Version of Virtual PC 2007 | |
517 | footer->major = be16_to_cpu(0x0005); | |
518 | footer->minor =be16_to_cpu(0x0003); | |
519 | ||
520 | footer->orig_size = be64_to_cpu(total_sectors * 512); | |
521 | footer->size = be64_to_cpu(total_sectors * 512); | |
522 | ||
523 | footer->cyls = be16_to_cpu(cyls); | |
524 | footer->heads = heads; | |
525 | footer->secs_per_cyl = secs_per_cyl; | |
526 | ||
527 | footer->type = be32_to_cpu(VHD_DYNAMIC); | |
528 | ||
529 | // TODO uuid is missing | |
530 | ||
531 | footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); | |
532 | ||
533 | // Write the footer (twice: at the beginning and at the end) | |
534 | block_size = 0x200000; | |
535 | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); | |
536 | ||
537 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) | |
538 | return -EIO; | |
539 | ||
540 | if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) | |
541 | return -EIO; | |
542 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) | |
543 | return -EIO; | |
544 | ||
545 | // Write the initial BAT | |
546 | if (lseek(fd, 3 * 512, SEEK_SET) < 0) | |
547 | return -EIO; | |
548 | ||
549 | memset(buf, 0xFF, 512); | |
550 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) | |
551 | if (write(fd, buf, 512) != 512) | |
552 | return -EIO; | |
553 | ||
554 | ||
555 | // Prepare the Dynamic Disk Header | |
556 | memset(buf, 0, 1024); | |
557 | ||
558 | strncpy(dyndisk_header->magic, "cxsparse", 8); | |
559 | ||
560 | dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF); | |
561 | dyndisk_header->table_offset = be64_to_cpu(3 * 512); | |
562 | dyndisk_header->version = be32_to_cpu(0x00010000); | |
563 | dyndisk_header->block_size = be32_to_cpu(block_size); | |
564 | dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries); | |
565 | ||
566 | dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024)); | |
567 | ||
568 | // Write the header | |
569 | if (lseek(fd, 512, SEEK_SET) < 0) | |
570 | return -EIO; | |
571 | if (write(fd, buf, 1024) != 1024) | |
572 | return -EIO; | |
573 | ||
574 | close(fd); | |
575 | return 0; | |
576 | } | |
577 | ||
6a0f9e82 FB |
578 | static void vpc_close(BlockDriverState *bs) |
579 | { | |
580 | BDRVVPCState *s = bs->opaque; | |
581 | qemu_free(s->pagetable); | |
582 | #ifdef CACHE | |
583 | qemu_free(s->pageentry_u8); | |
584 | #endif | |
b71d1c2e | 585 | bdrv_delete(s->hd); |
6a0f9e82 FB |
586 | } |
587 | ||
588 | BlockDriver bdrv_vpc = { | |
589 | "vpc", | |
590 | sizeof(BDRVVPCState), | |
591 | vpc_probe, | |
592 | vpc_open, | |
593 | vpc_read, | |
15d35bc5 | 594 | vpc_write, |
6a0f9e82 | 595 | vpc_close, |
57c7d9e5 | 596 | vpc_create, |
6a0f9e82 | 597 | }; |