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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" |
737e150e | 26 | #include "block/block_int.h" |
1de7afc9 | 27 | #include "qemu/module.h" |
caf71f86 | 28 | #include "migration/migration.h" |
1fe1fa51 CA |
29 | #if defined(CONFIG_UUID) |
30 | #include <uuid/uuid.h> | |
31 | #endif | |
6a0f9e82 FB |
32 | |
33 | /**************************************************************/ | |
34 | ||
35 | #define HEADER_SIZE 512 | |
36 | ||
37 | //#define CACHE | |
38 | ||
2cfacb62 AL |
39 | enum vhd_type { |
40 | VHD_FIXED = 2, | |
41 | VHD_DYNAMIC = 3, | |
42 | VHD_DIFFERENCING = 4, | |
43 | }; | |
44 | ||
57c7d9e5 AL |
45 | // Seconds since Jan 1, 2000 0:00:00 (UTC) |
46 | #define VHD_TIMESTAMP_BASE 946684800 | |
47 | ||
6a0f9e82 | 48 | // always big-endian |
e54835c0 | 49 | typedef struct vhd_footer { |
2cfacb62 AL |
50 | char creator[8]; // "conectix" |
51 | uint32_t features; | |
52 | uint32_t version; | |
53 | ||
54 | // Offset of next header structure, 0xFFFFFFFF if none | |
55 | uint64_t data_offset; | |
56 | ||
57 | // Seconds since Jan 1, 2000 0:00:00 (UTC) | |
58 | uint32_t timestamp; | |
59 | ||
60 | char creator_app[4]; // "vpc " | |
61 | uint16_t major; | |
62 | uint16_t minor; | |
63 | char creator_os[4]; // "Wi2k" | |
64 | ||
65 | uint64_t orig_size; | |
66 | uint64_t size; | |
67 | ||
68 | uint16_t cyls; | |
69 | uint8_t heads; | |
70 | uint8_t secs_per_cyl; | |
71 | ||
72 | uint32_t type; | |
73 | ||
74 | // Checksum of the Hard Disk Footer ("one's complement of the sum of all | |
75 | // the bytes in the footer without the checksum field") | |
76 | uint32_t checksum; | |
77 | ||
78 | // UUID used to identify a parent hard disk (backing file) | |
79 | uint8_t uuid[16]; | |
80 | ||
81 | uint8_t in_saved_state; | |
e54835c0 | 82 | } QEMU_PACKED VHDFooter; |
b9fa33a6 | 83 | |
e54835c0 | 84 | typedef struct vhd_dyndisk_header { |
2cfacb62 AL |
85 | char magic[8]; // "cxsparse" |
86 | ||
87 | // Offset of next header structure, 0xFFFFFFFF if none | |
88 | uint64_t data_offset; | |
89 | ||
90 | // Offset of the Block Allocation Table (BAT) | |
91 | uint64_t table_offset; | |
92 | ||
93 | uint32_t version; | |
94 | uint32_t max_table_entries; // 32bit/entry | |
95 | ||
96 | // 2 MB by default, must be a power of two | |
97 | uint32_t block_size; | |
98 | ||
99 | uint32_t checksum; | |
100 | uint8_t parent_uuid[16]; | |
101 | uint32_t parent_timestamp; | |
102 | uint32_t reserved; | |
103 | ||
104 | // Backing file name (in UTF-16) | |
105 | uint8_t parent_name[512]; | |
106 | ||
107 | struct { | |
108 | uint32_t platform; | |
109 | uint32_t data_space; | |
110 | uint32_t data_length; | |
111 | uint32_t reserved; | |
112 | uint64_t data_offset; | |
113 | } parent_locator[8]; | |
e54835c0 | 114 | } QEMU_PACKED VHDDynDiskHeader; |
6a0f9e82 FB |
115 | |
116 | typedef struct BDRVVPCState { | |
848c66e8 | 117 | CoMutex lock; |
15d35bc5 AL |
118 | uint8_t footer_buf[HEADER_SIZE]; |
119 | uint64_t free_data_block_offset; | |
2cfacb62 | 120 | int max_table_entries; |
6a0f9e82 | 121 | uint32_t *pagetable; |
15d35bc5 AL |
122 | uint64_t bat_offset; |
123 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 124 | |
2cfacb62 | 125 | uint32_t block_size; |
15d35bc5 AL |
126 | uint32_t bitmap_size; |
127 | ||
6a0f9e82 FB |
128 | #ifdef CACHE |
129 | uint8_t *pageentry_u8; | |
130 | uint32_t *pageentry_u32; | |
131 | uint16_t *pageentry_u16; | |
3b46e624 | 132 | |
6a0f9e82 FB |
133 | uint64_t last_bitmap; |
134 | #endif | |
612ff3d8 KW |
135 | |
136 | Error *migration_blocker; | |
6a0f9e82 FB |
137 | } BDRVVPCState; |
138 | ||
57c7d9e5 AL |
139 | static uint32_t vpc_checksum(uint8_t* buf, size_t size) |
140 | { | |
141 | uint32_t res = 0; | |
142 | int i; | |
143 | ||
144 | for (i = 0; i < size; i++) | |
145 | res += buf[i]; | |
146 | ||
147 | return ~res; | |
148 | } | |
149 | ||
150 | ||
6a0f9e82 FB |
151 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
152 | { | |
ffe8ab83 | 153 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
6a0f9e82 | 154 | return 100; |
6a0f9e82 FB |
155 | return 0; |
156 | } | |
157 | ||
015a1036 HR |
158 | static int vpc_open(BlockDriverState *bs, QDict *options, int flags, |
159 | Error **errp) | |
6a0f9e82 FB |
160 | { |
161 | BDRVVPCState *s = bs->opaque; | |
66f82cee | 162 | int i; |
e54835c0 JC |
163 | VHDFooter *footer; |
164 | VHDDynDiskHeader *dyndisk_header; | |
b9fa33a6 | 165 | uint8_t buf[HEADER_SIZE]; |
57c7d9e5 | 166 | uint32_t checksum; |
24da78db | 167 | int disk_type = VHD_DYNAMIC; |
59294e46 | 168 | int ret; |
6a0f9e82 | 169 | |
59294e46 KW |
170 | ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE); |
171 | if (ret < 0) { | |
6a0f9e82 | 172 | goto fail; |
59294e46 | 173 | } |
6a0f9e82 | 174 | |
e54835c0 | 175 | footer = (VHDFooter *) s->footer_buf; |
24da78db CA |
176 | if (strncmp(footer->creator, "conectix", 8)) { |
177 | int64_t offset = bdrv_getlength(bs->file); | |
59294e46 KW |
178 | if (offset < 0) { |
179 | ret = offset; | |
180 | goto fail; | |
181 | } else if (offset < HEADER_SIZE) { | |
182 | ret = -EINVAL; | |
24da78db CA |
183 | goto fail; |
184 | } | |
59294e46 | 185 | |
24da78db | 186 | /* If a fixed disk, the footer is found only at the end of the file */ |
59294e46 KW |
187 | ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, |
188 | HEADER_SIZE); | |
189 | if (ret < 0) { | |
24da78db CA |
190 | goto fail; |
191 | } | |
192 | if (strncmp(footer->creator, "conectix", 8)) { | |
59294e46 | 193 | ret = -EMEDIUMTYPE; |
24da78db CA |
194 | goto fail; |
195 | } | |
196 | disk_type = VHD_FIXED; | |
197 | } | |
6a0f9e82 | 198 | |
57c7d9e5 AL |
199 | checksum = be32_to_cpu(footer->checksum); |
200 | footer->checksum = 0; | |
201 | if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) | |
202 | fprintf(stderr, "block-vpc: The header checksum of '%s' is " | |
66f82cee | 203 | "incorrect.\n", bs->filename); |
57c7d9e5 | 204 | |
c088b691 ZS |
205 | /* Write 'checksum' back to footer, or else will leave it with zero. */ |
206 | footer->checksum = be32_to_cpu(checksum); | |
207 | ||
33ccf667 SH |
208 | // The visible size of a image in Virtual PC depends on the geometry |
209 | // rather than on the size stored in the footer (the size in the footer | |
210 | // is too large usually) | |
211 | bs->total_sectors = (int64_t) | |
212 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; | |
1fa79228 | 213 | |
258d2edb CA |
214 | /* Allow a maximum disk size of approximately 2 TB */ |
215 | if (bs->total_sectors >= 65535LL * 255 * 255) { | |
59294e46 | 216 | ret = -EFBIG; |
efc8243d SH |
217 | goto fail; |
218 | } | |
219 | ||
24da78db | 220 | if (disk_type == VHD_DYNAMIC) { |
59294e46 KW |
221 | ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, |
222 | HEADER_SIZE); | |
223 | if (ret < 0) { | |
24da78db CA |
224 | goto fail; |
225 | } | |
b9fa33a6 | 226 | |
e54835c0 | 227 | dyndisk_header = (VHDDynDiskHeader *) buf; |
6a0f9e82 | 228 | |
24da78db | 229 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { |
59294e46 | 230 | ret = -EINVAL; |
24da78db CA |
231 | goto fail; |
232 | } | |
6a0f9e82 | 233 | |
24da78db CA |
234 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
235 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; | |
15d35bc5 | 236 | |
24da78db CA |
237 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
238 | s->pagetable = g_malloc(s->max_table_entries * 4); | |
b71d1c2e | 239 | |
24da78db | 240 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
59294e46 KW |
241 | |
242 | ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable, | |
243 | s->max_table_entries * 4); | |
244 | if (ret < 0) { | |
24da78db CA |
245 | goto fail; |
246 | } | |
b71d1c2e | 247 | |
24da78db CA |
248 | s->free_data_block_offset = |
249 | (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; | |
15d35bc5 | 250 | |
24da78db CA |
251 | for (i = 0; i < s->max_table_entries; i++) { |
252 | be32_to_cpus(&s->pagetable[i]); | |
253 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
254 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
255 | s->bitmap_size + s->block_size; | |
15d35bc5 | 256 | |
24da78db CA |
257 | if (next > s->free_data_block_offset) { |
258 | s->free_data_block_offset = next; | |
259 | } | |
260 | } | |
15d35bc5 | 261 | } |
15d35bc5 | 262 | |
fb8fe35f PL |
263 | if (s->free_data_block_offset > bdrv_getlength(bs->file)) { |
264 | error_setg(errp, "block-vpc: free_data_block_offset points after " | |
265 | "the end of file. The image has been truncated."); | |
266 | ret = -EINVAL; | |
267 | goto fail; | |
268 | } | |
269 | ||
24da78db | 270 | s->last_bitmap_offset = (int64_t) -1; |
6a0f9e82 | 271 | |
6a0f9e82 | 272 | #ifdef CACHE |
24da78db CA |
273 | s->pageentry_u8 = g_malloc(512); |
274 | s->pageentry_u32 = s->pageentry_u8; | |
275 | s->pageentry_u16 = s->pageentry_u8; | |
276 | s->last_pagetable = -1; | |
6a0f9e82 | 277 | #endif |
24da78db | 278 | } |
6a0f9e82 | 279 | |
848c66e8 | 280 | qemu_co_mutex_init(&s->lock); |
612ff3d8 KW |
281 | |
282 | /* Disable migration when VHD images are used */ | |
283 | error_set(&s->migration_blocker, | |
284 | QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
285 | "vpc", bs->device_name, "live migration"); | |
286 | migrate_add_blocker(s->migration_blocker); | |
287 | ||
6a0f9e82 | 288 | return 0; |
59294e46 KW |
289 | |
290 | fail: | |
291 | g_free(s->pagetable); | |
292 | #ifdef CACHE | |
293 | g_free(s->pageentry_u8); | |
294 | #endif | |
295 | return ret; | |
6a0f9e82 FB |
296 | } |
297 | ||
3fe4b700 JC |
298 | static int vpc_reopen_prepare(BDRVReopenState *state, |
299 | BlockReopenQueue *queue, Error **errp) | |
300 | { | |
301 | return 0; | |
302 | } | |
303 | ||
b71d1c2e AL |
304 | /* |
305 | * Returns the absolute byte offset of the given sector in the image file. | |
306 | * If the sector is not allocated, -1 is returned instead. | |
15d35bc5 AL |
307 | * |
308 | * The parameter write must be 1 if the offset will be used for a write | |
309 | * operation (the block bitmaps is updated then), 0 otherwise. | |
b71d1c2e | 310 | */ |
15d35bc5 AL |
311 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
312 | int64_t sector_num, int write) | |
6a0f9e82 FB |
313 | { |
314 | BDRVVPCState *s = bs->opaque; | |
315 | uint64_t offset = sector_num * 512; | |
316 | uint64_t bitmap_offset, block_offset; | |
317 | uint32_t pagetable_index, pageentry_index; | |
318 | ||
2cfacb62 AL |
319 | pagetable_index = offset / s->block_size; |
320 | pageentry_index = (offset % s->block_size) / 512; | |
3b46e624 | 321 | |
15d35bc5 AL |
322 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
323 | return -1; // not allocated | |
6a0f9e82 | 324 | |
378e2aea | 325 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
15d35bc5 AL |
326 | block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); |
327 | ||
328 | // We must ensure that we don't write to any sectors which are marked as | |
329 | // unused in the bitmap. We get away with setting all bits in the block | |
330 | // bitmap each time we write to a new block. This might cause Virtual PC to | |
331 | // miss sparse read optimization, but it's not a problem in terms of | |
332 | // correctness. | |
333 | if (write && (s->last_bitmap_offset != bitmap_offset)) { | |
334 | uint8_t bitmap[s->bitmap_size]; | |
335 | ||
336 | s->last_bitmap_offset = bitmap_offset; | |
337 | memset(bitmap, 0xff, s->bitmap_size); | |
078a458e | 338 | bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); |
15d35bc5 | 339 | } |
3b46e624 | 340 | |
26a76461 | 341 | // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", |
6a0f9e82 FB |
342 | // sector_num, pagetable_index, pageentry_index, |
343 | // bitmap_offset, block_offset); | |
344 | ||
345 | // disabled by reason | |
346 | #if 0 | |
347 | #ifdef CACHE | |
348 | if (bitmap_offset != s->last_bitmap) | |
349 | { | |
350 | lseek(s->fd, bitmap_offset, SEEK_SET); | |
351 | ||
352 | s->last_bitmap = bitmap_offset; | |
5fafdf24 | 353 | |
6a0f9e82 FB |
354 | // Scary! Bitmap is stored as big endian 32bit entries, |
355 | // while we used to look it up byte by byte | |
356 | read(s->fd, s->pageentry_u8, 512); | |
357 | for (i = 0; i < 128; i++) | |
358 | be32_to_cpus(&s->pageentry_u32[i]); | |
359 | } | |
360 | ||
361 | if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) | |
362 | return -1; | |
363 | #else | |
364 | lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); | |
5fafdf24 | 365 | |
6a0f9e82 FB |
366 | read(s->fd, &bitmap_entry, 1); |
367 | ||
368 | if ((bitmap_entry >> (pageentry_index % 8)) & 1) | |
369 | return -1; // not allocated | |
370 | #endif | |
371 | #endif | |
6a0f9e82 | 372 | |
b71d1c2e | 373 | return block_offset; |
6a0f9e82 FB |
374 | } |
375 | ||
15d35bc5 AL |
376 | /* |
377 | * Writes the footer to the end of the image file. This is needed when the | |
378 | * file grows as it overwrites the old footer | |
379 | * | |
380 | * Returns 0 on success and < 0 on error | |
381 | */ | |
382 | static int rewrite_footer(BlockDriverState* bs) | |
383 | { | |
384 | int ret; | |
385 | BDRVVPCState *s = bs->opaque; | |
386 | int64_t offset = s->free_data_block_offset; | |
387 | ||
078a458e | 388 | ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); |
15d35bc5 AL |
389 | if (ret < 0) |
390 | return ret; | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Allocates a new block. This involves writing a new footer and updating | |
397 | * the Block Allocation Table to use the space at the old end of the image | |
398 | * file (overwriting the old footer) | |
399 | * | |
400 | * Returns the sectors' offset in the image file on success and < 0 on error | |
401 | */ | |
402 | static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) | |
403 | { | |
404 | BDRVVPCState *s = bs->opaque; | |
405 | int64_t bat_offset; | |
406 | uint32_t index, bat_value; | |
407 | int ret; | |
408 | uint8_t bitmap[s->bitmap_size]; | |
409 | ||
410 | // Check if sector_num is valid | |
411 | if ((sector_num < 0) || (sector_num > bs->total_sectors)) | |
412 | return -1; | |
413 | ||
414 | // Write entry into in-memory BAT | |
415 | index = (sector_num * 512) / s->block_size; | |
416 | if (s->pagetable[index] != 0xFFFFFFFF) | |
417 | return -1; | |
418 | ||
419 | s->pagetable[index] = s->free_data_block_offset / 512; | |
420 | ||
421 | // Initialize the block's bitmap | |
422 | memset(bitmap, 0xff, s->bitmap_size); | |
5bb1cbac | 423 | ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, |
078a458e | 424 | s->bitmap_size); |
5bb1cbac KW |
425 | if (ret < 0) { |
426 | return ret; | |
427 | } | |
15d35bc5 AL |
428 | |
429 | // Write new footer (the old one will be overwritten) | |
430 | s->free_data_block_offset += s->block_size + s->bitmap_size; | |
431 | ret = rewrite_footer(bs); | |
432 | if (ret < 0) | |
433 | goto fail; | |
434 | ||
435 | // Write BAT entry to disk | |
436 | bat_offset = s->bat_offset + (4 * index); | |
437 | bat_value = be32_to_cpu(s->pagetable[index]); | |
078a458e | 438 | ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); |
15d35bc5 AL |
439 | if (ret < 0) |
440 | goto fail; | |
441 | ||
442 | return get_sector_offset(bs, sector_num, 0); | |
443 | ||
444 | fail: | |
445 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
446 | return -1; | |
447 | } | |
448 | ||
5fafdf24 | 449 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
6a0f9e82 FB |
450 | uint8_t *buf, int nb_sectors) |
451 | { | |
6c6ea921 | 452 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 453 | int ret; |
b71d1c2e | 454 | int64_t offset; |
6c6ea921 | 455 | int64_t sectors, sectors_per_block; |
e54835c0 | 456 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
6a0f9e82 | 457 | |
24da78db CA |
458 | if (cpu_to_be32(footer->type) == VHD_FIXED) { |
459 | return bdrv_read(bs->file, sector_num, buf, nb_sectors); | |
460 | } | |
6a0f9e82 | 461 | while (nb_sectors > 0) { |
15d35bc5 | 462 | offset = get_sector_offset(bs, sector_num, 0); |
b71d1c2e | 463 | |
6c6ea921 KW |
464 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
465 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
466 | if (sectors > nb_sectors) { | |
467 | sectors = nb_sectors; | |
468 | } | |
469 | ||
b71d1c2e | 470 | if (offset == -1) { |
6c6ea921 | 471 | memset(buf, 0, sectors * BDRV_SECTOR_SIZE); |
b71d1c2e | 472 | } else { |
6c6ea921 KW |
473 | ret = bdrv_pread(bs->file, offset, buf, |
474 | sectors * BDRV_SECTOR_SIZE); | |
475 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
b71d1c2e | 476 | return -1; |
6c6ea921 | 477 | } |
b71d1c2e AL |
478 | } |
479 | ||
6c6ea921 KW |
480 | nb_sectors -= sectors; |
481 | sector_num += sectors; | |
482 | buf += sectors * BDRV_SECTOR_SIZE; | |
6a0f9e82 FB |
483 | } |
484 | return 0; | |
485 | } | |
486 | ||
2914caa0 PB |
487 | static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, |
488 | uint8_t *buf, int nb_sectors) | |
489 | { | |
490 | int ret; | |
491 | BDRVVPCState *s = bs->opaque; | |
492 | qemu_co_mutex_lock(&s->lock); | |
493 | ret = vpc_read(bs, sector_num, buf, nb_sectors); | |
494 | qemu_co_mutex_unlock(&s->lock); | |
495 | return ret; | |
496 | } | |
497 | ||
15d35bc5 AL |
498 | static int vpc_write(BlockDriverState *bs, int64_t sector_num, |
499 | const uint8_t *buf, int nb_sectors) | |
500 | { | |
6c6ea921 | 501 | BDRVVPCState *s = bs->opaque; |
15d35bc5 | 502 | int64_t offset; |
6c6ea921 | 503 | int64_t sectors, sectors_per_block; |
15d35bc5 | 504 | int ret; |
e54835c0 | 505 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
15d35bc5 | 506 | |
24da78db CA |
507 | if (cpu_to_be32(footer->type) == VHD_FIXED) { |
508 | return bdrv_write(bs->file, sector_num, buf, nb_sectors); | |
509 | } | |
15d35bc5 AL |
510 | while (nb_sectors > 0) { |
511 | offset = get_sector_offset(bs, sector_num, 1); | |
512 | ||
6c6ea921 KW |
513 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
514 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
515 | if (sectors > nb_sectors) { | |
516 | sectors = nb_sectors; | |
517 | } | |
518 | ||
15d35bc5 AL |
519 | if (offset == -1) { |
520 | offset = alloc_block(bs, sector_num); | |
521 | if (offset < 0) | |
522 | return -1; | |
523 | } | |
524 | ||
6c6ea921 KW |
525 | ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); |
526 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
15d35bc5 | 527 | return -1; |
6c6ea921 | 528 | } |
15d35bc5 | 529 | |
6c6ea921 KW |
530 | nb_sectors -= sectors; |
531 | sector_num += sectors; | |
532 | buf += sectors * BDRV_SECTOR_SIZE; | |
15d35bc5 AL |
533 | } |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
e183ef75 PB |
538 | static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, |
539 | const uint8_t *buf, int nb_sectors) | |
540 | { | |
541 | int ret; | |
542 | BDRVVPCState *s = bs->opaque; | |
543 | qemu_co_mutex_lock(&s->lock); | |
544 | ret = vpc_write(bs, sector_num, buf, nb_sectors); | |
545 | qemu_co_mutex_unlock(&s->lock); | |
546 | return ret; | |
547 | } | |
548 | ||
57c7d9e5 AL |
549 | /* |
550 | * Calculates the number of cylinders, heads and sectors per cylinder | |
551 | * based on a given number of sectors. This is the algorithm described | |
552 | * in the VHD specification. | |
553 | * | |
554 | * Note that the geometry doesn't always exactly match total_sectors but | |
555 | * may round it down. | |
6e9ea0c0 | 556 | * |
258d2edb CA |
557 | * Returns 0 on success, -EFBIG if the size is larger than ~2 TB. Override |
558 | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) | |
559 | * and instead allow up to 255 heads. | |
57c7d9e5 | 560 | */ |
6e9ea0c0 | 561 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
57c7d9e5 AL |
562 | uint8_t* heads, uint8_t* secs_per_cyl) |
563 | { | |
564 | uint32_t cyls_times_heads; | |
565 | ||
258d2edb CA |
566 | /* Allow a maximum disk size of approximately 2 TB */ |
567 | if (total_sectors > 65535LL * 255 * 255) { | |
6e9ea0c0 | 568 | return -EFBIG; |
258d2edb | 569 | } |
57c7d9e5 AL |
570 | |
571 | if (total_sectors > 65535 * 16 * 63) { | |
572 | *secs_per_cyl = 255; | |
258d2edb CA |
573 | if (total_sectors > 65535 * 16 * 255) { |
574 | *heads = 255; | |
575 | } else { | |
576 | *heads = 16; | |
577 | } | |
57c7d9e5 AL |
578 | cyls_times_heads = total_sectors / *secs_per_cyl; |
579 | } else { | |
580 | *secs_per_cyl = 17; | |
581 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
582 | *heads = (cyls_times_heads + 1023) / 1024; | |
583 | ||
584 | if (*heads < 4) | |
585 | *heads = 4; | |
586 | ||
587 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
588 | *secs_per_cyl = 31; | |
589 | *heads = 16; | |
590 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
591 | } | |
592 | ||
593 | if (cyls_times_heads >= (*heads * 1024)) { | |
594 | *secs_per_cyl = 63; | |
595 | *heads = 16; | |
596 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
597 | } | |
598 | } | |
599 | ||
dede4188 | 600 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
601 | |
602 | return 0; | |
57c7d9e5 AL |
603 | } |
604 | ||
24da78db | 605 | static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors) |
57c7d9e5 | 606 | { |
e54835c0 JC |
607 | VHDDynDiskHeader *dyndisk_header = |
608 | (VHDDynDiskHeader *) buf; | |
57c7d9e5 | 609 | size_t block_size, num_bat_entries; |
24da78db | 610 | int i; |
f0ff243a | 611 | int ret = -EIO; |
57c7d9e5 | 612 | |
57c7d9e5 AL |
613 | // Write the footer (twice: at the beginning and at the end) |
614 | block_size = 0x200000; | |
615 | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); | |
616 | ||
f0ff243a BS |
617 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { |
618 | goto fail; | |
619 | } | |
57c7d9e5 | 620 | |
f0ff243a BS |
621 | if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) { |
622 | goto fail; | |
623 | } | |
624 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { | |
625 | goto fail; | |
626 | } | |
57c7d9e5 AL |
627 | |
628 | // Write the initial BAT | |
f0ff243a BS |
629 | if (lseek(fd, 3 * 512, SEEK_SET) < 0) { |
630 | goto fail; | |
631 | } | |
57c7d9e5 AL |
632 | |
633 | memset(buf, 0xFF, 512); | |
f0ff243a BS |
634 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
635 | if (write(fd, buf, 512) != 512) { | |
636 | goto fail; | |
637 | } | |
638 | } | |
57c7d9e5 | 639 | |
57c7d9e5 AL |
640 | // Prepare the Dynamic Disk Header |
641 | memset(buf, 0, 1024); | |
642 | ||
5ec4d682 | 643 | memcpy(dyndisk_header->magic, "cxsparse", 8); |
57c7d9e5 | 644 | |
78439f6a CA |
645 | /* |
646 | * Note: The spec is actually wrong here for data_offset, it says | |
647 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. | |
648 | */ | |
649 | dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL); | |
57c7d9e5 AL |
650 | dyndisk_header->table_offset = be64_to_cpu(3 * 512); |
651 | dyndisk_header->version = be32_to_cpu(0x00010000); | |
652 | dyndisk_header->block_size = be32_to_cpu(block_size); | |
653 | dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries); | |
654 | ||
655 | dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024)); | |
656 | ||
657 | // Write the header | |
f0ff243a BS |
658 | if (lseek(fd, 512, SEEK_SET) < 0) { |
659 | goto fail; | |
660 | } | |
57c7d9e5 | 661 | |
f0ff243a BS |
662 | if (write(fd, buf, 1024) != 1024) { |
663 | goto fail; | |
664 | } | |
665 | ret = 0; | |
666 | ||
24da78db CA |
667 | fail: |
668 | return ret; | |
669 | } | |
670 | ||
671 | static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size) | |
672 | { | |
673 | int ret = -EIO; | |
674 | ||
675 | /* Add footer to total size */ | |
676 | total_size += 512; | |
677 | if (ftruncate(fd, total_size) != 0) { | |
678 | ret = -errno; | |
679 | goto fail; | |
680 | } | |
681 | if (lseek(fd, -512, SEEK_END) < 0) { | |
682 | goto fail; | |
683 | } | |
684 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { | |
685 | goto fail; | |
686 | } | |
687 | ||
688 | ret = 0; | |
689 | ||
690 | fail: | |
691 | return ret; | |
692 | } | |
693 | ||
d5124c00 HR |
694 | static int vpc_create(const char *filename, QEMUOptionParameter *options, |
695 | Error **errp) | |
24da78db CA |
696 | { |
697 | uint8_t buf[1024]; | |
e54835c0 | 698 | VHDFooter *footer = (VHDFooter *) buf; |
24da78db CA |
699 | QEMUOptionParameter *disk_type_param; |
700 | int fd, i; | |
701 | uint16_t cyls = 0; | |
702 | uint8_t heads = 0; | |
703 | uint8_t secs_per_cyl = 0; | |
704 | int64_t total_sectors; | |
705 | int64_t total_size; | |
706 | int disk_type; | |
707 | int ret = -EIO; | |
708 | ||
709 | /* Read out options */ | |
710 | total_size = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n; | |
711 | ||
712 | disk_type_param = get_option_parameter(options, BLOCK_OPT_SUBFMT); | |
713 | if (disk_type_param && disk_type_param->value.s) { | |
714 | if (!strcmp(disk_type_param->value.s, "dynamic")) { | |
715 | disk_type = VHD_DYNAMIC; | |
716 | } else if (!strcmp(disk_type_param->value.s, "fixed")) { | |
717 | disk_type = VHD_FIXED; | |
718 | } else { | |
719 | return -EINVAL; | |
720 | } | |
721 | } else { | |
722 | disk_type = VHD_DYNAMIC; | |
723 | } | |
724 | ||
725 | /* Create the file */ | |
6165f4d8 | 726 | fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); |
24da78db CA |
727 | if (fd < 0) { |
728 | return -EIO; | |
729 | } | |
730 | ||
ecd880d9 KW |
731 | /* |
732 | * Calculate matching total_size and geometry. Increase the number of | |
733 | * sectors requested until we get enough (or fail). This ensures that | |
734 | * qemu-img convert doesn't truncate images, but rather rounds up. | |
735 | */ | |
24da78db | 736 | total_sectors = total_size / BDRV_SECTOR_SIZE; |
ecd880d9 KW |
737 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { |
738 | if (calculate_geometry(total_sectors + i, &cyls, &heads, | |
739 | &secs_per_cyl)) | |
740 | { | |
24da78db CA |
741 | ret = -EFBIG; |
742 | goto fail; | |
743 | } | |
744 | } | |
ecd880d9 | 745 | |
24da78db CA |
746 | total_sectors = (int64_t) cyls * heads * secs_per_cyl; |
747 | ||
748 | /* Prepare the Hard Disk Footer */ | |
749 | memset(buf, 0, 1024); | |
750 | ||
751 | memcpy(footer->creator, "conectix", 8); | |
752 | /* TODO Check if "qemu" creator_app is ok for VPC */ | |
753 | memcpy(footer->creator_app, "qemu", 4); | |
754 | memcpy(footer->creator_os, "Wi2k", 4); | |
755 | ||
756 | footer->features = be32_to_cpu(0x02); | |
757 | footer->version = be32_to_cpu(0x00010000); | |
758 | if (disk_type == VHD_DYNAMIC) { | |
759 | footer->data_offset = be64_to_cpu(HEADER_SIZE); | |
760 | } else { | |
761 | footer->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL); | |
762 | } | |
763 | footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE); | |
764 | ||
765 | /* Version of Virtual PC 2007 */ | |
766 | footer->major = be16_to_cpu(0x0005); | |
767 | footer->minor = be16_to_cpu(0x0003); | |
768 | if (disk_type == VHD_DYNAMIC) { | |
769 | footer->orig_size = be64_to_cpu(total_sectors * 512); | |
770 | footer->size = be64_to_cpu(total_sectors * 512); | |
771 | } else { | |
772 | footer->orig_size = be64_to_cpu(total_size); | |
773 | footer->size = be64_to_cpu(total_size); | |
774 | } | |
775 | footer->cyls = be16_to_cpu(cyls); | |
776 | footer->heads = heads; | |
777 | footer->secs_per_cyl = secs_per_cyl; | |
778 | ||
779 | footer->type = be32_to_cpu(disk_type); | |
780 | ||
1fe1fa51 CA |
781 | #if defined(CONFIG_UUID) |
782 | uuid_generate(footer->uuid); | |
783 | #endif | |
24da78db CA |
784 | |
785 | footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); | |
786 | ||
787 | if (disk_type == VHD_DYNAMIC) { | |
788 | ret = create_dynamic_disk(fd, buf, total_sectors); | |
789 | } else { | |
790 | ret = create_fixed_disk(fd, buf, total_size); | |
791 | } | |
792 | ||
f0ff243a | 793 | fail: |
2e1e79da | 794 | qemu_close(fd); |
f0ff243a | 795 | return ret; |
57c7d9e5 AL |
796 | } |
797 | ||
72c6cc94 KW |
798 | static int vpc_has_zero_init(BlockDriverState *bs) |
799 | { | |
800 | BDRVVPCState *s = bs->opaque; | |
e54835c0 | 801 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
72c6cc94 KW |
802 | |
803 | if (cpu_to_be32(footer->type) == VHD_FIXED) { | |
804 | return bdrv_has_zero_init(bs->file); | |
805 | } else { | |
806 | return 1; | |
807 | } | |
808 | } | |
809 | ||
6a0f9e82 FB |
810 | static void vpc_close(BlockDriverState *bs) |
811 | { | |
812 | BDRVVPCState *s = bs->opaque; | |
7267c094 | 813 | g_free(s->pagetable); |
6a0f9e82 | 814 | #ifdef CACHE |
7267c094 | 815 | g_free(s->pageentry_u8); |
6a0f9e82 | 816 | #endif |
612ff3d8 KW |
817 | |
818 | migrate_del_blocker(s->migration_blocker); | |
819 | error_free(s->migration_blocker); | |
6a0f9e82 FB |
820 | } |
821 | ||
0e7e1989 | 822 | static QEMUOptionParameter vpc_create_options[] = { |
db08adf5 KW |
823 | { |
824 | .name = BLOCK_OPT_SIZE, | |
825 | .type = OPT_SIZE, | |
826 | .help = "Virtual disk size" | |
827 | }, | |
24da78db CA |
828 | { |
829 | .name = BLOCK_OPT_SUBFMT, | |
830 | .type = OPT_STRING, | |
831 | .help = | |
832 | "Type of virtual hard disk format. Supported formats are " | |
833 | "{dynamic (default) | fixed} " | |
834 | }, | |
0e7e1989 KW |
835 | { NULL } |
836 | }; | |
837 | ||
5efa9d5a | 838 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
839 | .format_name = "vpc", |
840 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 841 | |
72c6cc94 KW |
842 | .bdrv_probe = vpc_probe, |
843 | .bdrv_open = vpc_open, | |
844 | .bdrv_close = vpc_close, | |
845 | .bdrv_reopen_prepare = vpc_reopen_prepare, | |
846 | .bdrv_create = vpc_create, | |
0e7e1989 | 847 | |
c68b89ac KW |
848 | .bdrv_read = vpc_co_read, |
849 | .bdrv_write = vpc_co_write, | |
c68b89ac | 850 | |
72c6cc94 KW |
851 | .create_options = vpc_create_options, |
852 | .bdrv_has_zero_init = vpc_has_zero_init, | |
6a0f9e82 | 853 | }; |
5efa9d5a AL |
854 | |
855 | static void bdrv_vpc_init(void) | |
856 | { | |
857 | bdrv_register(&bdrv_vpc); | |
858 | } | |
859 | ||
860 | block_init(bdrv_vpc_init); |