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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 | ||
97f1c45c JC |
48 | #define VHD_MAX_SECTORS (65535LL * 255 * 255) |
49 | ||
6a0f9e82 | 50 | // always big-endian |
e54835c0 | 51 | typedef struct vhd_footer { |
2cfacb62 AL |
52 | char creator[8]; // "conectix" |
53 | uint32_t features; | |
54 | uint32_t version; | |
55 | ||
56 | // Offset of next header structure, 0xFFFFFFFF if none | |
57 | uint64_t data_offset; | |
58 | ||
59 | // Seconds since Jan 1, 2000 0:00:00 (UTC) | |
60 | uint32_t timestamp; | |
61 | ||
62 | char creator_app[4]; // "vpc " | |
63 | uint16_t major; | |
64 | uint16_t minor; | |
65 | char creator_os[4]; // "Wi2k" | |
66 | ||
67 | uint64_t orig_size; | |
68 | uint64_t size; | |
69 | ||
70 | uint16_t cyls; | |
71 | uint8_t heads; | |
72 | uint8_t secs_per_cyl; | |
73 | ||
74 | uint32_t type; | |
75 | ||
76 | // Checksum of the Hard Disk Footer ("one's complement of the sum of all | |
77 | // the bytes in the footer without the checksum field") | |
78 | uint32_t checksum; | |
79 | ||
80 | // UUID used to identify a parent hard disk (backing file) | |
81 | uint8_t uuid[16]; | |
82 | ||
83 | uint8_t in_saved_state; | |
e54835c0 | 84 | } QEMU_PACKED VHDFooter; |
b9fa33a6 | 85 | |
e54835c0 | 86 | typedef struct vhd_dyndisk_header { |
2cfacb62 AL |
87 | char magic[8]; // "cxsparse" |
88 | ||
89 | // Offset of next header structure, 0xFFFFFFFF if none | |
90 | uint64_t data_offset; | |
91 | ||
92 | // Offset of the Block Allocation Table (BAT) | |
93 | uint64_t table_offset; | |
94 | ||
95 | uint32_t version; | |
96 | uint32_t max_table_entries; // 32bit/entry | |
97 | ||
98 | // 2 MB by default, must be a power of two | |
99 | uint32_t block_size; | |
100 | ||
101 | uint32_t checksum; | |
102 | uint8_t parent_uuid[16]; | |
103 | uint32_t parent_timestamp; | |
104 | uint32_t reserved; | |
105 | ||
106 | // Backing file name (in UTF-16) | |
107 | uint8_t parent_name[512]; | |
108 | ||
109 | struct { | |
110 | uint32_t platform; | |
111 | uint32_t data_space; | |
112 | uint32_t data_length; | |
113 | uint32_t reserved; | |
114 | uint64_t data_offset; | |
115 | } parent_locator[8]; | |
e54835c0 | 116 | } QEMU_PACKED VHDDynDiskHeader; |
6a0f9e82 FB |
117 | |
118 | typedef struct BDRVVPCState { | |
848c66e8 | 119 | CoMutex lock; |
15d35bc5 AL |
120 | uint8_t footer_buf[HEADER_SIZE]; |
121 | uint64_t free_data_block_offset; | |
2cfacb62 | 122 | int max_table_entries; |
6a0f9e82 | 123 | uint32_t *pagetable; |
15d35bc5 AL |
124 | uint64_t bat_offset; |
125 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 126 | |
2cfacb62 | 127 | uint32_t block_size; |
15d35bc5 AL |
128 | uint32_t bitmap_size; |
129 | ||
6a0f9e82 FB |
130 | #ifdef CACHE |
131 | uint8_t *pageentry_u8; | |
132 | uint32_t *pageentry_u32; | |
133 | uint16_t *pageentry_u16; | |
3b46e624 | 134 | |
6a0f9e82 FB |
135 | uint64_t last_bitmap; |
136 | #endif | |
612ff3d8 KW |
137 | |
138 | Error *migration_blocker; | |
6a0f9e82 FB |
139 | } BDRVVPCState; |
140 | ||
57c7d9e5 AL |
141 | static uint32_t vpc_checksum(uint8_t* buf, size_t size) |
142 | { | |
143 | uint32_t res = 0; | |
144 | int i; | |
145 | ||
146 | for (i = 0; i < size; i++) | |
147 | res += buf[i]; | |
148 | ||
149 | return ~res; | |
150 | } | |
151 | ||
152 | ||
6a0f9e82 FB |
153 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
154 | { | |
ffe8ab83 | 155 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
6a0f9e82 | 156 | return 100; |
6a0f9e82 FB |
157 | return 0; |
158 | } | |
159 | ||
015a1036 HR |
160 | static int vpc_open(BlockDriverState *bs, QDict *options, int flags, |
161 | Error **errp) | |
6a0f9e82 FB |
162 | { |
163 | BDRVVPCState *s = bs->opaque; | |
66f82cee | 164 | int i; |
e54835c0 JC |
165 | VHDFooter *footer; |
166 | VHDDynDiskHeader *dyndisk_header; | |
b9fa33a6 | 167 | uint8_t buf[HEADER_SIZE]; |
57c7d9e5 | 168 | uint32_t checksum; |
97f1c45c | 169 | uint64_t computed_size; |
24da78db | 170 | int disk_type = VHD_DYNAMIC; |
59294e46 | 171 | int ret; |
6a0f9e82 | 172 | |
59294e46 KW |
173 | ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE); |
174 | if (ret < 0) { | |
6a0f9e82 | 175 | goto fail; |
59294e46 | 176 | } |
6a0f9e82 | 177 | |
e54835c0 | 178 | footer = (VHDFooter *) s->footer_buf; |
24da78db CA |
179 | if (strncmp(footer->creator, "conectix", 8)) { |
180 | int64_t offset = bdrv_getlength(bs->file); | |
59294e46 KW |
181 | if (offset < 0) { |
182 | ret = offset; | |
183 | goto fail; | |
184 | } else if (offset < HEADER_SIZE) { | |
185 | ret = -EINVAL; | |
24da78db CA |
186 | goto fail; |
187 | } | |
59294e46 | 188 | |
24da78db | 189 | /* If a fixed disk, the footer is found only at the end of the file */ |
59294e46 KW |
190 | ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, |
191 | HEADER_SIZE); | |
192 | if (ret < 0) { | |
24da78db CA |
193 | goto fail; |
194 | } | |
195 | if (strncmp(footer->creator, "conectix", 8)) { | |
76abe407 PB |
196 | error_setg(errp, "invalid VPC image"); |
197 | ret = -EINVAL; | |
24da78db CA |
198 | goto fail; |
199 | } | |
200 | disk_type = VHD_FIXED; | |
201 | } | |
6a0f9e82 | 202 | |
57c7d9e5 AL |
203 | checksum = be32_to_cpu(footer->checksum); |
204 | footer->checksum = 0; | |
205 | if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) | |
206 | fprintf(stderr, "block-vpc: The header checksum of '%s' is " | |
66f82cee | 207 | "incorrect.\n", bs->filename); |
57c7d9e5 | 208 | |
c088b691 | 209 | /* Write 'checksum' back to footer, or else will leave it with zero. */ |
a4127c42 | 210 | footer->checksum = cpu_to_be32(checksum); |
c088b691 | 211 | |
33ccf667 SH |
212 | // The visible size of a image in Virtual PC depends on the geometry |
213 | // rather than on the size stored in the footer (the size in the footer | |
214 | // is too large usually) | |
215 | bs->total_sectors = (int64_t) | |
216 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; | |
1fa79228 | 217 | |
0444dcee KW |
218 | /* Images that have exactly the maximum geometry are probably bigger and |
219 | * would be truncated if we adhered to the geometry for them. Rely on | |
220 | * footer->size for them. */ | |
221 | if (bs->total_sectors == 65535ULL * 16 * 255) { | |
0173e7bb PL |
222 | bs->total_sectors = be64_to_cpu(footer->size) / BDRV_SECTOR_SIZE; |
223 | } | |
224 | ||
258d2edb | 225 | /* Allow a maximum disk size of approximately 2 TB */ |
97f1c45c | 226 | if (bs->total_sectors >= VHD_MAX_SECTORS) { |
59294e46 | 227 | ret = -EFBIG; |
efc8243d SH |
228 | goto fail; |
229 | } | |
230 | ||
24da78db | 231 | if (disk_type == VHD_DYNAMIC) { |
59294e46 KW |
232 | ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, |
233 | HEADER_SIZE); | |
234 | if (ret < 0) { | |
24da78db CA |
235 | goto fail; |
236 | } | |
b9fa33a6 | 237 | |
e54835c0 | 238 | dyndisk_header = (VHDDynDiskHeader *) buf; |
6a0f9e82 | 239 | |
24da78db | 240 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { |
59294e46 | 241 | ret = -EINVAL; |
24da78db CA |
242 | goto fail; |
243 | } | |
6a0f9e82 | 244 | |
24da78db | 245 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
5e71dfad KW |
246 | if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { |
247 | error_setg(errp, "Invalid block size %" PRIu32, s->block_size); | |
248 | ret = -EINVAL; | |
249 | goto fail; | |
250 | } | |
24da78db | 251 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; |
15d35bc5 | 252 | |
24da78db | 253 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
97f1c45c JC |
254 | |
255 | if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { | |
256 | ret = -EINVAL; | |
257 | goto fail; | |
258 | } | |
259 | if (s->max_table_entries > (VHD_MAX_SECTORS * 512) / s->block_size) { | |
260 | ret = -EINVAL; | |
261 | goto fail; | |
262 | } | |
263 | ||
264 | computed_size = (uint64_t) s->max_table_entries * s->block_size; | |
265 | if (computed_size < bs->total_sectors * 512) { | |
266 | ret = -EINVAL; | |
267 | goto fail; | |
268 | } | |
269 | ||
5fb09cd5 KW |
270 | s->pagetable = qemu_try_blockalign(bs->file, s->max_table_entries * 4); |
271 | if (s->pagetable == NULL) { | |
272 | ret = -ENOMEM; | |
273 | goto fail; | |
274 | } | |
b71d1c2e | 275 | |
24da78db | 276 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
59294e46 KW |
277 | |
278 | ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable, | |
279 | s->max_table_entries * 4); | |
280 | if (ret < 0) { | |
24da78db CA |
281 | goto fail; |
282 | } | |
b71d1c2e | 283 | |
24da78db CA |
284 | s->free_data_block_offset = |
285 | (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; | |
15d35bc5 | 286 | |
24da78db CA |
287 | for (i = 0; i < s->max_table_entries; i++) { |
288 | be32_to_cpus(&s->pagetable[i]); | |
289 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
290 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
291 | s->bitmap_size + s->block_size; | |
15d35bc5 | 292 | |
24da78db CA |
293 | if (next > s->free_data_block_offset) { |
294 | s->free_data_block_offset = next; | |
295 | } | |
296 | } | |
15d35bc5 | 297 | } |
15d35bc5 | 298 | |
fb8fe35f PL |
299 | if (s->free_data_block_offset > bdrv_getlength(bs->file)) { |
300 | error_setg(errp, "block-vpc: free_data_block_offset points after " | |
301 | "the end of file. The image has been truncated."); | |
302 | ret = -EINVAL; | |
303 | goto fail; | |
304 | } | |
305 | ||
24da78db | 306 | s->last_bitmap_offset = (int64_t) -1; |
6a0f9e82 | 307 | |
6a0f9e82 | 308 | #ifdef CACHE |
24da78db CA |
309 | s->pageentry_u8 = g_malloc(512); |
310 | s->pageentry_u32 = s->pageentry_u8; | |
311 | s->pageentry_u16 = s->pageentry_u8; | |
312 | s->last_pagetable = -1; | |
6a0f9e82 | 313 | #endif |
24da78db | 314 | } |
6a0f9e82 | 315 | |
848c66e8 | 316 | qemu_co_mutex_init(&s->lock); |
612ff3d8 KW |
317 | |
318 | /* Disable migration when VHD images are used */ | |
319 | error_set(&s->migration_blocker, | |
320 | QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
bfb197e0 | 321 | "vpc", bdrv_get_device_name(bs), "live migration"); |
612ff3d8 KW |
322 | migrate_add_blocker(s->migration_blocker); |
323 | ||
6a0f9e82 | 324 | return 0; |
59294e46 KW |
325 | |
326 | fail: | |
97f1c45c | 327 | qemu_vfree(s->pagetable); |
59294e46 KW |
328 | #ifdef CACHE |
329 | g_free(s->pageentry_u8); | |
330 | #endif | |
331 | return ret; | |
6a0f9e82 FB |
332 | } |
333 | ||
3fe4b700 JC |
334 | static int vpc_reopen_prepare(BDRVReopenState *state, |
335 | BlockReopenQueue *queue, Error **errp) | |
336 | { | |
337 | return 0; | |
338 | } | |
339 | ||
b71d1c2e AL |
340 | /* |
341 | * Returns the absolute byte offset of the given sector in the image file. | |
342 | * If the sector is not allocated, -1 is returned instead. | |
15d35bc5 AL |
343 | * |
344 | * The parameter write must be 1 if the offset will be used for a write | |
345 | * operation (the block bitmaps is updated then), 0 otherwise. | |
b71d1c2e | 346 | */ |
15d35bc5 AL |
347 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
348 | int64_t sector_num, int write) | |
6a0f9e82 FB |
349 | { |
350 | BDRVVPCState *s = bs->opaque; | |
351 | uint64_t offset = sector_num * 512; | |
352 | uint64_t bitmap_offset, block_offset; | |
353 | uint32_t pagetable_index, pageentry_index; | |
354 | ||
2cfacb62 AL |
355 | pagetable_index = offset / s->block_size; |
356 | pageentry_index = (offset % s->block_size) / 512; | |
3b46e624 | 357 | |
15d35bc5 AL |
358 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
359 | return -1; // not allocated | |
6a0f9e82 | 360 | |
378e2aea | 361 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
15d35bc5 AL |
362 | block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); |
363 | ||
364 | // We must ensure that we don't write to any sectors which are marked as | |
365 | // unused in the bitmap. We get away with setting all bits in the block | |
366 | // bitmap each time we write to a new block. This might cause Virtual PC to | |
367 | // miss sparse read optimization, but it's not a problem in terms of | |
368 | // correctness. | |
369 | if (write && (s->last_bitmap_offset != bitmap_offset)) { | |
370 | uint8_t bitmap[s->bitmap_size]; | |
371 | ||
372 | s->last_bitmap_offset = bitmap_offset; | |
373 | memset(bitmap, 0xff, s->bitmap_size); | |
078a458e | 374 | bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); |
15d35bc5 | 375 | } |
3b46e624 | 376 | |
26a76461 | 377 | // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", |
6a0f9e82 FB |
378 | // sector_num, pagetable_index, pageentry_index, |
379 | // bitmap_offset, block_offset); | |
380 | ||
381 | // disabled by reason | |
382 | #if 0 | |
383 | #ifdef CACHE | |
384 | if (bitmap_offset != s->last_bitmap) | |
385 | { | |
386 | lseek(s->fd, bitmap_offset, SEEK_SET); | |
387 | ||
388 | s->last_bitmap = bitmap_offset; | |
5fafdf24 | 389 | |
6a0f9e82 FB |
390 | // Scary! Bitmap is stored as big endian 32bit entries, |
391 | // while we used to look it up byte by byte | |
392 | read(s->fd, s->pageentry_u8, 512); | |
393 | for (i = 0; i < 128; i++) | |
394 | be32_to_cpus(&s->pageentry_u32[i]); | |
395 | } | |
396 | ||
397 | if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) | |
398 | return -1; | |
399 | #else | |
400 | lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); | |
5fafdf24 | 401 | |
6a0f9e82 FB |
402 | read(s->fd, &bitmap_entry, 1); |
403 | ||
404 | if ((bitmap_entry >> (pageentry_index % 8)) & 1) | |
405 | return -1; // not allocated | |
406 | #endif | |
407 | #endif | |
6a0f9e82 | 408 | |
b71d1c2e | 409 | return block_offset; |
6a0f9e82 FB |
410 | } |
411 | ||
15d35bc5 AL |
412 | /* |
413 | * Writes the footer to the end of the image file. This is needed when the | |
414 | * file grows as it overwrites the old footer | |
415 | * | |
416 | * Returns 0 on success and < 0 on error | |
417 | */ | |
418 | static int rewrite_footer(BlockDriverState* bs) | |
419 | { | |
420 | int ret; | |
421 | BDRVVPCState *s = bs->opaque; | |
422 | int64_t offset = s->free_data_block_offset; | |
423 | ||
078a458e | 424 | ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); |
15d35bc5 AL |
425 | if (ret < 0) |
426 | return ret; | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Allocates a new block. This involves writing a new footer and updating | |
433 | * the Block Allocation Table to use the space at the old end of the image | |
434 | * file (overwriting the old footer) | |
435 | * | |
436 | * Returns the sectors' offset in the image file on success and < 0 on error | |
437 | */ | |
438 | static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) | |
439 | { | |
440 | BDRVVPCState *s = bs->opaque; | |
441 | int64_t bat_offset; | |
442 | uint32_t index, bat_value; | |
443 | int ret; | |
444 | uint8_t bitmap[s->bitmap_size]; | |
445 | ||
446 | // Check if sector_num is valid | |
447 | if ((sector_num < 0) || (sector_num > bs->total_sectors)) | |
448 | return -1; | |
449 | ||
450 | // Write entry into in-memory BAT | |
451 | index = (sector_num * 512) / s->block_size; | |
452 | if (s->pagetable[index] != 0xFFFFFFFF) | |
453 | return -1; | |
454 | ||
455 | s->pagetable[index] = s->free_data_block_offset / 512; | |
456 | ||
457 | // Initialize the block's bitmap | |
458 | memset(bitmap, 0xff, s->bitmap_size); | |
5bb1cbac | 459 | ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, |
078a458e | 460 | s->bitmap_size); |
5bb1cbac KW |
461 | if (ret < 0) { |
462 | return ret; | |
463 | } | |
15d35bc5 AL |
464 | |
465 | // Write new footer (the old one will be overwritten) | |
466 | s->free_data_block_offset += s->block_size + s->bitmap_size; | |
467 | ret = rewrite_footer(bs); | |
468 | if (ret < 0) | |
469 | goto fail; | |
470 | ||
471 | // Write BAT entry to disk | |
472 | bat_offset = s->bat_offset + (4 * index); | |
a4127c42 | 473 | bat_value = cpu_to_be32(s->pagetable[index]); |
078a458e | 474 | ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); |
15d35bc5 AL |
475 | if (ret < 0) |
476 | goto fail; | |
477 | ||
478 | return get_sector_offset(bs, sector_num, 0); | |
479 | ||
480 | fail: | |
481 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
482 | return -1; | |
483 | } | |
484 | ||
97b00e28 PB |
485 | static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
486 | { | |
487 | BDRVVPCState *s = (BDRVVPCState *)bs->opaque; | |
488 | VHDFooter *footer = (VHDFooter *) s->footer_buf; | |
489 | ||
0d4cc3e7 | 490 | if (be32_to_cpu(footer->type) != VHD_FIXED) { |
97b00e28 PB |
491 | bdi->cluster_size = s->block_size; |
492 | } | |
493 | ||
95de6d70 | 494 | bdi->unallocated_blocks_are_zero = true; |
97b00e28 PB |
495 | return 0; |
496 | } | |
497 | ||
5fafdf24 | 498 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
6a0f9e82 FB |
499 | uint8_t *buf, int nb_sectors) |
500 | { | |
6c6ea921 | 501 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 502 | int ret; |
b71d1c2e | 503 | int64_t offset; |
6c6ea921 | 504 | int64_t sectors, sectors_per_block; |
e54835c0 | 505 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
6a0f9e82 | 506 | |
0d4cc3e7 | 507 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
24da78db CA |
508 | return bdrv_read(bs->file, sector_num, buf, nb_sectors); |
509 | } | |
6a0f9e82 | 510 | while (nb_sectors > 0) { |
15d35bc5 | 511 | offset = get_sector_offset(bs, sector_num, 0); |
b71d1c2e | 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 | ||
b71d1c2e | 519 | if (offset == -1) { |
6c6ea921 | 520 | memset(buf, 0, sectors * BDRV_SECTOR_SIZE); |
b71d1c2e | 521 | } else { |
6c6ea921 KW |
522 | ret = bdrv_pread(bs->file, offset, buf, |
523 | sectors * BDRV_SECTOR_SIZE); | |
524 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
b71d1c2e | 525 | return -1; |
6c6ea921 | 526 | } |
b71d1c2e AL |
527 | } |
528 | ||
6c6ea921 KW |
529 | nb_sectors -= sectors; |
530 | sector_num += sectors; | |
531 | buf += sectors * BDRV_SECTOR_SIZE; | |
6a0f9e82 FB |
532 | } |
533 | return 0; | |
534 | } | |
535 | ||
2914caa0 PB |
536 | static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, |
537 | uint8_t *buf, int nb_sectors) | |
538 | { | |
539 | int ret; | |
540 | BDRVVPCState *s = bs->opaque; | |
541 | qemu_co_mutex_lock(&s->lock); | |
542 | ret = vpc_read(bs, sector_num, buf, nb_sectors); | |
543 | qemu_co_mutex_unlock(&s->lock); | |
544 | return ret; | |
545 | } | |
546 | ||
15d35bc5 AL |
547 | static int vpc_write(BlockDriverState *bs, int64_t sector_num, |
548 | const uint8_t *buf, int nb_sectors) | |
549 | { | |
6c6ea921 | 550 | BDRVVPCState *s = bs->opaque; |
15d35bc5 | 551 | int64_t offset; |
6c6ea921 | 552 | int64_t sectors, sectors_per_block; |
15d35bc5 | 553 | int ret; |
e54835c0 | 554 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
15d35bc5 | 555 | |
0d4cc3e7 | 556 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
24da78db CA |
557 | return bdrv_write(bs->file, sector_num, buf, nb_sectors); |
558 | } | |
15d35bc5 AL |
559 | while (nb_sectors > 0) { |
560 | offset = get_sector_offset(bs, sector_num, 1); | |
561 | ||
6c6ea921 KW |
562 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
563 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
564 | if (sectors > nb_sectors) { | |
565 | sectors = nb_sectors; | |
566 | } | |
567 | ||
15d35bc5 AL |
568 | if (offset == -1) { |
569 | offset = alloc_block(bs, sector_num); | |
570 | if (offset < 0) | |
571 | return -1; | |
572 | } | |
573 | ||
6c6ea921 KW |
574 | ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); |
575 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
15d35bc5 | 576 | return -1; |
6c6ea921 | 577 | } |
15d35bc5 | 578 | |
6c6ea921 KW |
579 | nb_sectors -= sectors; |
580 | sector_num += sectors; | |
581 | buf += sectors * BDRV_SECTOR_SIZE; | |
15d35bc5 AL |
582 | } |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
e183ef75 PB |
587 | static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, |
588 | const uint8_t *buf, int nb_sectors) | |
589 | { | |
590 | int ret; | |
591 | BDRVVPCState *s = bs->opaque; | |
592 | qemu_co_mutex_lock(&s->lock); | |
593 | ret = vpc_write(bs, sector_num, buf, nb_sectors); | |
594 | qemu_co_mutex_unlock(&s->lock); | |
595 | return ret; | |
596 | } | |
597 | ||
0cc84887 KW |
598 | static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs, |
599 | int64_t sector_num, int nb_sectors, int *pnum) | |
600 | { | |
601 | BDRVVPCState *s = bs->opaque; | |
602 | VHDFooter *footer = (VHDFooter*) s->footer_buf; | |
2ec711dc | 603 | int64_t start, offset; |
0cc84887 KW |
604 | bool allocated; |
605 | int n; | |
606 | ||
607 | if (be32_to_cpu(footer->type) == VHD_FIXED) { | |
608 | *pnum = nb_sectors; | |
609 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | | |
610 | (sector_num << BDRV_SECTOR_BITS); | |
611 | } | |
612 | ||
613 | offset = get_sector_offset(bs, sector_num, 0); | |
614 | start = offset; | |
615 | allocated = (offset != -1); | |
616 | *pnum = 0; | |
617 | ||
618 | do { | |
619 | /* All sectors in a block are contiguous (without using the bitmap) */ | |
620 | n = ROUND_UP(sector_num + 1, s->block_size / BDRV_SECTOR_SIZE) | |
621 | - sector_num; | |
622 | n = MIN(n, nb_sectors); | |
623 | ||
624 | *pnum += n; | |
625 | sector_num += n; | |
626 | nb_sectors -= n; | |
2ec711dc PL |
627 | /* *pnum can't be greater than one block for allocated |
628 | * sectors since there is always a bitmap in between. */ | |
629 | if (allocated) { | |
630 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start; | |
631 | } | |
0cc84887 KW |
632 | if (nb_sectors == 0) { |
633 | break; | |
634 | } | |
0cc84887 | 635 | offset = get_sector_offset(bs, sector_num, 0); |
2ec711dc | 636 | } while (offset == -1); |
0cc84887 | 637 | |
2ec711dc | 638 | return 0; |
0cc84887 KW |
639 | } |
640 | ||
57c7d9e5 AL |
641 | /* |
642 | * Calculates the number of cylinders, heads and sectors per cylinder | |
643 | * based on a given number of sectors. This is the algorithm described | |
644 | * in the VHD specification. | |
645 | * | |
646 | * Note that the geometry doesn't always exactly match total_sectors but | |
647 | * may round it down. | |
6e9ea0c0 | 648 | * |
258d2edb CA |
649 | * Returns 0 on success, -EFBIG if the size is larger than ~2 TB. Override |
650 | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) | |
651 | * and instead allow up to 255 heads. | |
57c7d9e5 | 652 | */ |
6e9ea0c0 | 653 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
57c7d9e5 AL |
654 | uint8_t* heads, uint8_t* secs_per_cyl) |
655 | { | |
656 | uint32_t cyls_times_heads; | |
657 | ||
258d2edb CA |
658 | /* Allow a maximum disk size of approximately 2 TB */ |
659 | if (total_sectors > 65535LL * 255 * 255) { | |
6e9ea0c0 | 660 | return -EFBIG; |
258d2edb | 661 | } |
57c7d9e5 AL |
662 | |
663 | if (total_sectors > 65535 * 16 * 63) { | |
664 | *secs_per_cyl = 255; | |
258d2edb CA |
665 | if (total_sectors > 65535 * 16 * 255) { |
666 | *heads = 255; | |
667 | } else { | |
668 | *heads = 16; | |
669 | } | |
57c7d9e5 AL |
670 | cyls_times_heads = total_sectors / *secs_per_cyl; |
671 | } else { | |
672 | *secs_per_cyl = 17; | |
673 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
674 | *heads = (cyls_times_heads + 1023) / 1024; | |
675 | ||
676 | if (*heads < 4) | |
677 | *heads = 4; | |
678 | ||
679 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
680 | *secs_per_cyl = 31; | |
681 | *heads = 16; | |
682 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
683 | } | |
684 | ||
685 | if (cyls_times_heads >= (*heads * 1024)) { | |
686 | *secs_per_cyl = 63; | |
687 | *heads = 16; | |
688 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
689 | } | |
690 | } | |
691 | ||
dede4188 | 692 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
693 | |
694 | return 0; | |
57c7d9e5 AL |
695 | } |
696 | ||
fef6070e JC |
697 | static int create_dynamic_disk(BlockDriverState *bs, uint8_t *buf, |
698 | int64_t total_sectors) | |
57c7d9e5 | 699 | { |
e54835c0 JC |
700 | VHDDynDiskHeader *dyndisk_header = |
701 | (VHDDynDiskHeader *) buf; | |
57c7d9e5 | 702 | size_t block_size, num_bat_entries; |
24da78db | 703 | int i; |
fef6070e JC |
704 | int ret; |
705 | int64_t offset = 0; | |
57c7d9e5 | 706 | |
57c7d9e5 AL |
707 | // Write the footer (twice: at the beginning and at the end) |
708 | block_size = 0x200000; | |
709 | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); | |
710 | ||
fef6070e JC |
711 | ret = bdrv_pwrite_sync(bs, offset, buf, HEADER_SIZE); |
712 | if (ret) { | |
f0ff243a BS |
713 | goto fail; |
714 | } | |
57c7d9e5 | 715 | |
fef6070e JC |
716 | offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); |
717 | ret = bdrv_pwrite_sync(bs, offset, buf, HEADER_SIZE); | |
718 | if (ret < 0) { | |
f0ff243a BS |
719 | goto fail; |
720 | } | |
57c7d9e5 AL |
721 | |
722 | // Write the initial BAT | |
fef6070e | 723 | offset = 3 * 512; |
57c7d9e5 AL |
724 | |
725 | memset(buf, 0xFF, 512); | |
f0ff243a | 726 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
fef6070e JC |
727 | ret = bdrv_pwrite_sync(bs, offset, buf, 512); |
728 | if (ret < 0) { | |
f0ff243a BS |
729 | goto fail; |
730 | } | |
fef6070e | 731 | offset += 512; |
f0ff243a | 732 | } |
57c7d9e5 | 733 | |
57c7d9e5 AL |
734 | // Prepare the Dynamic Disk Header |
735 | memset(buf, 0, 1024); | |
736 | ||
5ec4d682 | 737 | memcpy(dyndisk_header->magic, "cxsparse", 8); |
57c7d9e5 | 738 | |
78439f6a CA |
739 | /* |
740 | * Note: The spec is actually wrong here for data_offset, it says | |
741 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. | |
742 | */ | |
a4127c42 SH |
743 | dyndisk_header->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
744 | dyndisk_header->table_offset = cpu_to_be64(3 * 512); | |
745 | dyndisk_header->version = cpu_to_be32(0x00010000); | |
746 | dyndisk_header->block_size = cpu_to_be32(block_size); | |
747 | dyndisk_header->max_table_entries = cpu_to_be32(num_bat_entries); | |
57c7d9e5 | 748 | |
a4127c42 | 749 | dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024)); |
57c7d9e5 AL |
750 | |
751 | // Write the header | |
fef6070e | 752 | offset = 512; |
57c7d9e5 | 753 | |
fef6070e JC |
754 | ret = bdrv_pwrite_sync(bs, offset, buf, 1024); |
755 | if (ret < 0) { | |
f0ff243a BS |
756 | goto fail; |
757 | } | |
f0ff243a | 758 | |
24da78db CA |
759 | fail: |
760 | return ret; | |
761 | } | |
762 | ||
fef6070e JC |
763 | static int create_fixed_disk(BlockDriverState *bs, uint8_t *buf, |
764 | int64_t total_size) | |
24da78db | 765 | { |
fef6070e | 766 | int ret; |
24da78db CA |
767 | |
768 | /* Add footer to total size */ | |
fef6070e JC |
769 | total_size += HEADER_SIZE; |
770 | ||
771 | ret = bdrv_truncate(bs, total_size); | |
772 | if (ret < 0) { | |
773 | return ret; | |
24da78db CA |
774 | } |
775 | ||
fef6070e JC |
776 | ret = bdrv_pwrite_sync(bs, total_size - HEADER_SIZE, buf, HEADER_SIZE); |
777 | if (ret < 0) { | |
778 | return ret; | |
779 | } | |
24da78db | 780 | |
24da78db CA |
781 | return ret; |
782 | } | |
783 | ||
fec9921f | 784 | static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) |
24da78db CA |
785 | { |
786 | uint8_t buf[1024]; | |
e54835c0 | 787 | VHDFooter *footer = (VHDFooter *) buf; |
fec9921f | 788 | char *disk_type_param; |
fef6070e | 789 | int i; |
24da78db CA |
790 | uint16_t cyls = 0; |
791 | uint8_t heads = 0; | |
792 | uint8_t secs_per_cyl = 0; | |
793 | int64_t total_sectors; | |
794 | int64_t total_size; | |
795 | int disk_type; | |
796 | int ret = -EIO; | |
fef6070e JC |
797 | Error *local_err = NULL; |
798 | BlockDriverState *bs = NULL; | |
24da78db CA |
799 | |
800 | /* Read out options */ | |
c2eb918e HT |
801 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
802 | BDRV_SECTOR_SIZE); | |
fec9921f CL |
803 | disk_type_param = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); |
804 | if (disk_type_param) { | |
805 | if (!strcmp(disk_type_param, "dynamic")) { | |
24da78db | 806 | disk_type = VHD_DYNAMIC; |
fec9921f | 807 | } else if (!strcmp(disk_type_param, "fixed")) { |
24da78db CA |
808 | disk_type = VHD_FIXED; |
809 | } else { | |
fec9921f CL |
810 | ret = -EINVAL; |
811 | goto out; | |
24da78db CA |
812 | } |
813 | } else { | |
814 | disk_type = VHD_DYNAMIC; | |
815 | } | |
816 | ||
fef6070e JC |
817 | ret = bdrv_create_file(filename, opts, &local_err); |
818 | if (ret < 0) { | |
819 | error_propagate(errp, local_err); | |
fec9921f | 820 | goto out; |
24da78db | 821 | } |
fef6070e JC |
822 | ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, |
823 | NULL, &local_err); | |
824 | if (ret < 0) { | |
825 | error_propagate(errp, local_err); | |
826 | goto out; | |
4ab15590 CL |
827 | } |
828 | ||
ecd880d9 KW |
829 | /* |
830 | * Calculate matching total_size and geometry. Increase the number of | |
831 | * sectors requested until we get enough (or fail). This ensures that | |
832 | * qemu-img convert doesn't truncate images, but rather rounds up. | |
833 | */ | |
24da78db | 834 | total_sectors = total_size / BDRV_SECTOR_SIZE; |
ecd880d9 KW |
835 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { |
836 | if (calculate_geometry(total_sectors + i, &cyls, &heads, | |
837 | &secs_per_cyl)) | |
838 | { | |
24da78db | 839 | ret = -EFBIG; |
fef6070e | 840 | goto out; |
24da78db CA |
841 | } |
842 | } | |
ecd880d9 | 843 | |
24da78db | 844 | total_sectors = (int64_t) cyls * heads * secs_per_cyl; |
3f3f20dc | 845 | total_size = total_sectors * BDRV_SECTOR_SIZE; |
24da78db CA |
846 | |
847 | /* Prepare the Hard Disk Footer */ | |
848 | memset(buf, 0, 1024); | |
849 | ||
850 | memcpy(footer->creator, "conectix", 8); | |
851 | /* TODO Check if "qemu" creator_app is ok for VPC */ | |
852 | memcpy(footer->creator_app, "qemu", 4); | |
853 | memcpy(footer->creator_os, "Wi2k", 4); | |
854 | ||
a4127c42 SH |
855 | footer->features = cpu_to_be32(0x02); |
856 | footer->version = cpu_to_be32(0x00010000); | |
24da78db | 857 | if (disk_type == VHD_DYNAMIC) { |
a4127c42 | 858 | footer->data_offset = cpu_to_be64(HEADER_SIZE); |
24da78db | 859 | } else { |
a4127c42 | 860 | footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
24da78db | 861 | } |
a4127c42 | 862 | footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); |
24da78db CA |
863 | |
864 | /* Version of Virtual PC 2007 */ | |
a4127c42 SH |
865 | footer->major = cpu_to_be16(0x0005); |
866 | footer->minor = cpu_to_be16(0x0003); | |
3f3f20dc KW |
867 | footer->orig_size = cpu_to_be64(total_size); |
868 | footer->size = cpu_to_be64(total_size); | |
a4127c42 | 869 | footer->cyls = cpu_to_be16(cyls); |
24da78db CA |
870 | footer->heads = heads; |
871 | footer->secs_per_cyl = secs_per_cyl; | |
872 | ||
a4127c42 | 873 | footer->type = cpu_to_be32(disk_type); |
24da78db | 874 | |
1fe1fa51 CA |
875 | #if defined(CONFIG_UUID) |
876 | uuid_generate(footer->uuid); | |
877 | #endif | |
24da78db | 878 | |
a4127c42 | 879 | footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE)); |
24da78db CA |
880 | |
881 | if (disk_type == VHD_DYNAMIC) { | |
fef6070e | 882 | ret = create_dynamic_disk(bs, buf, total_sectors); |
24da78db | 883 | } else { |
fef6070e | 884 | ret = create_fixed_disk(bs, buf, total_size); |
24da78db CA |
885 | } |
886 | ||
fec9921f | 887 | out: |
fef6070e | 888 | bdrv_unref(bs); |
fec9921f | 889 | g_free(disk_type_param); |
f0ff243a | 890 | return ret; |
57c7d9e5 AL |
891 | } |
892 | ||
72c6cc94 KW |
893 | static int vpc_has_zero_init(BlockDriverState *bs) |
894 | { | |
895 | BDRVVPCState *s = bs->opaque; | |
e54835c0 | 896 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
72c6cc94 | 897 | |
0d4cc3e7 | 898 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
72c6cc94 KW |
899 | return bdrv_has_zero_init(bs->file); |
900 | } else { | |
901 | return 1; | |
902 | } | |
903 | } | |
904 | ||
6a0f9e82 FB |
905 | static void vpc_close(BlockDriverState *bs) |
906 | { | |
907 | BDRVVPCState *s = bs->opaque; | |
97f1c45c | 908 | qemu_vfree(s->pagetable); |
6a0f9e82 | 909 | #ifdef CACHE |
7267c094 | 910 | g_free(s->pageentry_u8); |
6a0f9e82 | 911 | #endif |
612ff3d8 KW |
912 | |
913 | migrate_del_blocker(s->migration_blocker); | |
914 | error_free(s->migration_blocker); | |
6a0f9e82 FB |
915 | } |
916 | ||
fec9921f CL |
917 | static QemuOptsList vpc_create_opts = { |
918 | .name = "vpc-create-opts", | |
919 | .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head), | |
920 | .desc = { | |
921 | { | |
922 | .name = BLOCK_OPT_SIZE, | |
923 | .type = QEMU_OPT_SIZE, | |
924 | .help = "Virtual disk size" | |
925 | }, | |
926 | { | |
927 | .name = BLOCK_OPT_SUBFMT, | |
928 | .type = QEMU_OPT_STRING, | |
929 | .help = | |
930 | "Type of virtual hard disk format. Supported formats are " | |
931 | "{dynamic (default) | fixed} " | |
932 | }, | |
933 | { /* end of list */ } | |
934 | } | |
0e7e1989 KW |
935 | }; |
936 | ||
5efa9d5a | 937 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
938 | .format_name = "vpc", |
939 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 940 | |
72c6cc94 KW |
941 | .bdrv_probe = vpc_probe, |
942 | .bdrv_open = vpc_open, | |
943 | .bdrv_close = vpc_close, | |
944 | .bdrv_reopen_prepare = vpc_reopen_prepare, | |
c282e1fd | 945 | .bdrv_create = vpc_create, |
0e7e1989 | 946 | |
0cc84887 KW |
947 | .bdrv_read = vpc_co_read, |
948 | .bdrv_write = vpc_co_write, | |
949 | .bdrv_co_get_block_status = vpc_co_get_block_status, | |
c68b89ac | 950 | |
97b00e28 PB |
951 | .bdrv_get_info = vpc_get_info, |
952 | ||
fec9921f | 953 | .create_opts = &vpc_create_opts, |
72c6cc94 | 954 | .bdrv_has_zero_init = vpc_has_zero_init, |
6a0f9e82 | 955 | }; |
5efa9d5a AL |
956 | |
957 | static void bdrv_vpc_init(void) | |
958 | { | |
959 | bdrv_register(&bdrv_vpc); | |
960 | } | |
961 | ||
962 | block_init(bdrv_vpc_init); |