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Commit | Line | Data |
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6a0f9e82 | 1 | /* |
cc2040f8 | 2 | * Block driver for Connectix / 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 | 26 | #include "block_int.h" |
5efa9d5a | 27 | #include "module.h" |
612ff3d8 | 28 | #include "migration.h" |
6a0f9e82 FB |
29 | |
30 | /**************************************************************/ | |
31 | ||
32 | #define HEADER_SIZE 512 | |
33 | ||
34 | //#define CACHE | |
35 | ||
2cfacb62 AL |
36 | enum vhd_type { |
37 | VHD_FIXED = 2, | |
38 | VHD_DYNAMIC = 3, | |
39 | VHD_DIFFERENCING = 4, | |
40 | }; | |
41 | ||
57c7d9e5 AL |
42 | // Seconds since Jan 1, 2000 0:00:00 (UTC) |
43 | #define VHD_TIMESTAMP_BASE 946684800 | |
44 | ||
6a0f9e82 | 45 | // always big-endian |
b9fa33a6 | 46 | struct vhd_footer { |
2cfacb62 AL |
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; | |
b9fa33a6 AL |
79 | }; |
80 | ||
81 | struct vhd_dyndisk_header { | |
2cfacb62 AL |
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]; | |
6a0f9e82 FB |
111 | }; |
112 | ||
113 | typedef struct BDRVVPCState { | |
848c66e8 | 114 | CoMutex lock; |
15d35bc5 AL |
115 | uint8_t footer_buf[HEADER_SIZE]; |
116 | uint64_t free_data_block_offset; | |
2cfacb62 | 117 | int max_table_entries; |
6a0f9e82 | 118 | uint32_t *pagetable; |
15d35bc5 AL |
119 | uint64_t bat_offset; |
120 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 121 | |
2cfacb62 | 122 | uint32_t block_size; |
15d35bc5 AL |
123 | uint32_t bitmap_size; |
124 | ||
6a0f9e82 FB |
125 | #ifdef CACHE |
126 | uint8_t *pageentry_u8; | |
127 | uint32_t *pageentry_u32; | |
128 | uint16_t *pageentry_u16; | |
3b46e624 | 129 | |
6a0f9e82 FB |
130 | uint64_t last_bitmap; |
131 | #endif | |
612ff3d8 KW |
132 | |
133 | Error *migration_blocker; | |
6a0f9e82 FB |
134 | } BDRVVPCState; |
135 | ||
57c7d9e5 AL |
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 | ||
6a0f9e82 FB |
148 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
149 | { | |
ffe8ab83 | 150 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
6a0f9e82 | 151 | return 100; |
6a0f9e82 FB |
152 | return 0; |
153 | } | |
154 | ||
66f82cee | 155 | static int vpc_open(BlockDriverState *bs, int flags) |
6a0f9e82 FB |
156 | { |
157 | BDRVVPCState *s = bs->opaque; | |
66f82cee | 158 | int i; |
b9fa33a6 AL |
159 | struct vhd_footer* footer; |
160 | struct vhd_dyndisk_header* dyndisk_header; | |
161 | uint8_t buf[HEADER_SIZE]; | |
57c7d9e5 | 162 | uint32_t checksum; |
efc8243d | 163 | int err = -1; |
6a0f9e82 | 164 | |
66f82cee | 165 | if (bdrv_pread(bs->file, 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 " | |
66f82cee | 176 | "incorrect.\n", bs->filename); |
57c7d9e5 | 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 | ||
efc8243d SH |
184 | if (bs->total_sectors >= 65535 * 16 * 255) { |
185 | err = -EFBIG; | |
186 | goto fail; | |
187 | } | |
188 | ||
66f82cee | 189 | if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE) |
b71d1c2e | 190 | != HEADER_SIZE) |
6a0f9e82 FB |
191 | goto fail; |
192 | ||
b9fa33a6 AL |
193 | dyndisk_header = (struct vhd_dyndisk_header*) buf; |
194 | ||
195 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) | |
196 | goto fail; | |
6a0f9e82 | 197 | |
6a0f9e82 | 198 | |
15d35bc5 AL |
199 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
200 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; | |
201 | ||
2cfacb62 | 202 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
7267c094 | 203 | s->pagetable = g_malloc(s->max_table_entries * 4); |
b71d1c2e | 204 | |
15d35bc5 | 205 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
66f82cee | 206 | if (bdrv_pread(bs->file, s->bat_offset, s->pagetable, |
15d35bc5 | 207 | s->max_table_entries * 4) != s->max_table_entries * 4) |
b71d1c2e AL |
208 | goto fail; |
209 | ||
15d35bc5 AL |
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; | |
6a0f9e82 | 225 | |
6a0f9e82 | 226 | #ifdef CACHE |
7267c094 | 227 | s->pageentry_u8 = g_malloc(512); |
6a0f9e82 FB |
228 | s->pageentry_u32 = s->pageentry_u8; |
229 | s->pageentry_u16 = s->pageentry_u8; | |
230 | s->last_pagetable = -1; | |
231 | #endif | |
232 | ||
848c66e8 | 233 | qemu_co_mutex_init(&s->lock); |
612ff3d8 KW |
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 | ||
6a0f9e82 FB |
241 | return 0; |
242 | fail: | |
efc8243d | 243 | return err; |
6a0f9e82 FB |
244 | } |
245 | ||
b71d1c2e AL |
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. | |
15d35bc5 AL |
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. | |
b71d1c2e | 252 | */ |
15d35bc5 AL |
253 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
254 | int64_t sector_num, int write) | |
6a0f9e82 FB |
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 | ||
2cfacb62 AL |
261 | pagetable_index = offset / s->block_size; |
262 | pageentry_index = (offset % s->block_size) / 512; | |
3b46e624 | 263 | |
15d35bc5 AL |
264 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
265 | return -1; // not allocated | |
6a0f9e82 | 266 | |
378e2aea | 267 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
15d35bc5 AL |
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); | |
078a458e | 280 | bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); |
15d35bc5 | 281 | } |
3b46e624 | 282 | |
26a76461 | 283 | // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", |
6a0f9e82 FB |
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; | |
5fafdf24 | 295 | |
6a0f9e82 FB |
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); | |
5fafdf24 | 307 | |
6a0f9e82 FB |
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 | |
6a0f9e82 | 314 | |
b71d1c2e | 315 | return block_offset; |
6a0f9e82 FB |
316 | } |
317 | ||
15d35bc5 AL |
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 | ||
078a458e | 330 | ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); |
15d35bc5 AL |
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); | |
5bb1cbac | 365 | ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, |
078a458e | 366 | s->bitmap_size); |
5bb1cbac KW |
367 | if (ret < 0) { |
368 | return ret; | |
369 | } | |
15d35bc5 AL |
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]); | |
078a458e | 380 | ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); |
15d35bc5 AL |
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 | ||
5fafdf24 | 391 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
6a0f9e82 FB |
392 | uint8_t *buf, int nb_sectors) |
393 | { | |
6c6ea921 | 394 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 395 | int ret; |
b71d1c2e | 396 | int64_t offset; |
6c6ea921 | 397 | int64_t sectors, sectors_per_block; |
6a0f9e82 FB |
398 | |
399 | while (nb_sectors > 0) { | |
15d35bc5 | 400 | offset = get_sector_offset(bs, sector_num, 0); |
b71d1c2e | 401 | |
6c6ea921 KW |
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 | ||
b71d1c2e | 408 | if (offset == -1) { |
6c6ea921 | 409 | memset(buf, 0, sectors * BDRV_SECTOR_SIZE); |
b71d1c2e | 410 | } else { |
6c6ea921 KW |
411 | ret = bdrv_pread(bs->file, offset, buf, |
412 | sectors * BDRV_SECTOR_SIZE); | |
413 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
b71d1c2e | 414 | return -1; |
6c6ea921 | 415 | } |
b71d1c2e AL |
416 | } |
417 | ||
6c6ea921 KW |
418 | nb_sectors -= sectors; |
419 | sector_num += sectors; | |
420 | buf += sectors * BDRV_SECTOR_SIZE; | |
6a0f9e82 FB |
421 | } |
422 | return 0; | |
423 | } | |
424 | ||
2914caa0 PB |
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 | ||
15d35bc5 AL |
436 | static int vpc_write(BlockDriverState *bs, int64_t sector_num, |
437 | const uint8_t *buf, int nb_sectors) | |
438 | { | |
6c6ea921 | 439 | BDRVVPCState *s = bs->opaque; |
15d35bc5 | 440 | int64_t offset; |
6c6ea921 | 441 | int64_t sectors, sectors_per_block; |
15d35bc5 AL |
442 | int ret; |
443 | ||
444 | while (nb_sectors > 0) { | |
445 | offset = get_sector_offset(bs, sector_num, 1); | |
446 | ||
6c6ea921 KW |
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 | ||
15d35bc5 AL |
453 | if (offset == -1) { |
454 | offset = alloc_block(bs, sector_num); | |
455 | if (offset < 0) | |
456 | return -1; | |
457 | } | |
458 | ||
6c6ea921 KW |
459 | ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); |
460 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
15d35bc5 | 461 | return -1; |
6c6ea921 | 462 | } |
15d35bc5 | 463 | |
6c6ea921 KW |
464 | nb_sectors -= sectors; |
465 | sector_num += sectors; | |
466 | buf += sectors * BDRV_SECTOR_SIZE; | |
15d35bc5 AL |
467 | } |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
e183ef75 PB |
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 | ||
8b94ff85 | 483 | static coroutine_fn int vpc_co_flush(BlockDriverState *bs) |
4a411185 | 484 | { |
8b94ff85 | 485 | return bdrv_co_flush(bs->file); |
4a411185 | 486 | } |
57c7d9e5 AL |
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. | |
6e9ea0c0 AJ |
495 | * |
496 | * Returns 0 on success, -EFBIG if the size is larger than 127 GB | |
57c7d9e5 | 497 | */ |
6e9ea0c0 | 498 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
57c7d9e5 AL |
499 | uint8_t* heads, uint8_t* secs_per_cyl) |
500 | { | |
501 | uint32_t cyls_times_heads; | |
502 | ||
503 | if (total_sectors > 65535 * 16 * 255) | |
6e9ea0c0 | 504 | return -EFBIG; |
57c7d9e5 AL |
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 | ||
dede4188 | 531 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
532 | |
533 | return 0; | |
57c7d9e5 AL |
534 | } |
535 | ||
0e7e1989 | 536 | static int vpc_create(const char *filename, QEMUOptionParameter *options) |
57c7d9e5 AL |
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; | |
dede4188 SW |
543 | uint16_t cyls = 0; |
544 | uint8_t heads = 0; | |
545 | uint8_t secs_per_cyl = 0; | |
57c7d9e5 | 546 | size_t block_size, num_bat_entries; |
0e7e1989 | 547 | int64_t total_sectors = 0; |
f0ff243a | 548 | int ret = -EIO; |
57c7d9e5 | 549 | |
0e7e1989 | 550 | // Read out options |
2d56a546 ML |
551 | total_sectors = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n / |
552 | BDRV_SECTOR_SIZE; | |
57c7d9e5 | 553 | |
0e7e1989 | 554 | // Create the file |
57c7d9e5 AL |
555 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); |
556 | if (fd < 0) | |
557 | return -EIO; | |
558 | ||
dede4188 SW |
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)) { | |
f0ff243a BS |
564 | ret = -EFBIG; |
565 | goto fail; | |
dede4188 SW |
566 | } |
567 | } | |
57c7d9e5 AL |
568 | total_sectors = (int64_t) cyls * heads * secs_per_cyl; |
569 | ||
570 | // Prepare the Hard Disk Footer | |
571 | memset(buf, 0, 1024); | |
572 | ||
5ec4d682 | 573 | memcpy(footer->creator, "conectix", 8); |
57c7d9e5 | 574 | // TODO Check if "qemu" creator_app is ok for VPC |
5ec4d682 NF |
575 | memcpy(footer->creator_app, "qemu", 4); |
576 | memcpy(footer->creator_os, "Wi2k", 4); | |
57c7d9e5 AL |
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 | ||
f0ff243a BS |
604 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { |
605 | goto fail; | |
606 | } | |
57c7d9e5 | 607 | |
f0ff243a BS |
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 | } | |
57c7d9e5 AL |
614 | |
615 | // Write the initial BAT | |
f0ff243a BS |
616 | if (lseek(fd, 3 * 512, SEEK_SET) < 0) { |
617 | goto fail; | |
618 | } | |
57c7d9e5 AL |
619 | |
620 | memset(buf, 0xFF, 512); | |
f0ff243a BS |
621 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
622 | if (write(fd, buf, 512) != 512) { | |
623 | goto fail; | |
624 | } | |
625 | } | |
57c7d9e5 AL |
626 | |
627 | ||
628 | // Prepare the Dynamic Disk Header | |
629 | memset(buf, 0, 1024); | |
630 | ||
5ec4d682 | 631 | memcpy(dyndisk_header->magic, "cxsparse", 8); |
57c7d9e5 | 632 | |
78439f6a CA |
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); | |
57c7d9e5 AL |
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 | |
f0ff243a BS |
646 | if (lseek(fd, 512, SEEK_SET) < 0) { |
647 | goto fail; | |
648 | } | |
57c7d9e5 | 649 | |
f0ff243a BS |
650 | if (write(fd, buf, 1024) != 1024) { |
651 | goto fail; | |
652 | } | |
653 | ret = 0; | |
654 | ||
655 | fail: | |
57c7d9e5 | 656 | close(fd); |
f0ff243a | 657 | return ret; |
57c7d9e5 AL |
658 | } |
659 | ||
6a0f9e82 FB |
660 | static void vpc_close(BlockDriverState *bs) |
661 | { | |
662 | BDRVVPCState *s = bs->opaque; | |
7267c094 | 663 | g_free(s->pagetable); |
6a0f9e82 | 664 | #ifdef CACHE |
7267c094 | 665 | g_free(s->pageentry_u8); |
6a0f9e82 | 666 | #endif |
612ff3d8 KW |
667 | |
668 | migrate_del_blocker(s->migration_blocker); | |
669 | error_free(s->migration_blocker); | |
6a0f9e82 FB |
670 | } |
671 | ||
0e7e1989 | 672 | static QEMUOptionParameter vpc_create_options[] = { |
db08adf5 KW |
673 | { |
674 | .name = BLOCK_OPT_SIZE, | |
675 | .type = OPT_SIZE, | |
676 | .help = "Virtual disk size" | |
677 | }, | |
0e7e1989 KW |
678 | { NULL } |
679 | }; | |
680 | ||
5efa9d5a | 681 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
682 | .format_name = "vpc", |
683 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 684 | |
4a411185 KW |
685 | .bdrv_probe = vpc_probe, |
686 | .bdrv_open = vpc_open, | |
4a411185 KW |
687 | .bdrv_close = vpc_close, |
688 | .bdrv_create = vpc_create, | |
0e7e1989 | 689 | |
c68b89ac KW |
690 | .bdrv_read = vpc_co_read, |
691 | .bdrv_write = vpc_co_write, | |
692 | .bdrv_co_flush_to_disk = vpc_co_flush, | |
693 | ||
0e7e1989 | 694 | .create_options = vpc_create_options, |
6a0f9e82 | 695 | }; |
5efa9d5a AL |
696 | |
697 | static void bdrv_vpc_init(void) | |
698 | { | |
699 | bdrv_register(&bdrv_vpc); | |
700 | } | |
701 | ||
702 | block_init(bdrv_vpc_init); |