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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 | */ | |
80c71a24 | 25 | #include "qemu/osdep.h" |
da34e65c | 26 | #include "qapi/error.h" |
faf07963 | 27 | #include "qemu-common.h" |
737e150e | 28 | #include "block/block_int.h" |
b8f45cdf | 29 | #include "sysemu/block-backend.h" |
1de7afc9 | 30 | #include "qemu/module.h" |
caf71f86 | 31 | #include "migration/migration.h" |
1fe1fa51 CA |
32 | #if defined(CONFIG_UUID) |
33 | #include <uuid/uuid.h> | |
34 | #endif | |
6a0f9e82 FB |
35 | |
36 | /**************************************************************/ | |
37 | ||
38 | #define HEADER_SIZE 512 | |
39 | ||
40 | //#define CACHE | |
41 | ||
2cfacb62 AL |
42 | enum vhd_type { |
43 | VHD_FIXED = 2, | |
44 | VHD_DYNAMIC = 3, | |
45 | VHD_DIFFERENCING = 4, | |
46 | }; | |
47 | ||
57c7d9e5 AL |
48 | // Seconds since Jan 1, 2000 0:00:00 (UTC) |
49 | #define VHD_TIMESTAMP_BASE 946684800 | |
50 | ||
fb9245c2 JC |
51 | #define VHD_CHS_MAX_C 65535LL |
52 | #define VHD_CHS_MAX_H 16 | |
53 | #define VHD_CHS_MAX_S 255 | |
54 | ||
97f1c45c | 55 | #define VHD_MAX_SECTORS (65535LL * 255 * 255) |
fb9245c2 JC |
56 | #define VHD_MAX_GEOMETRY (VHD_CHS_MAX_C * VHD_CHS_MAX_H * VHD_CHS_MAX_S) |
57 | ||
58 | #define VPC_OPT_FORCE_SIZE "force_size" | |
97f1c45c | 59 | |
6a0f9e82 | 60 | // always big-endian |
e54835c0 | 61 | typedef struct vhd_footer { |
2cfacb62 AL |
62 | char creator[8]; // "conectix" |
63 | uint32_t features; | |
64 | uint32_t version; | |
65 | ||
66 | // Offset of next header structure, 0xFFFFFFFF if none | |
67 | uint64_t data_offset; | |
68 | ||
69 | // Seconds since Jan 1, 2000 0:00:00 (UTC) | |
70 | uint32_t timestamp; | |
71 | ||
72 | char creator_app[4]; // "vpc " | |
73 | uint16_t major; | |
74 | uint16_t minor; | |
75 | char creator_os[4]; // "Wi2k" | |
76 | ||
77 | uint64_t orig_size; | |
03671ded | 78 | uint64_t current_size; |
2cfacb62 AL |
79 | |
80 | uint16_t cyls; | |
81 | uint8_t heads; | |
82 | uint8_t secs_per_cyl; | |
83 | ||
84 | uint32_t type; | |
85 | ||
86 | // Checksum of the Hard Disk Footer ("one's complement of the sum of all | |
87 | // the bytes in the footer without the checksum field") | |
88 | uint32_t checksum; | |
89 | ||
90 | // UUID used to identify a parent hard disk (backing file) | |
91 | uint8_t uuid[16]; | |
92 | ||
93 | uint8_t in_saved_state; | |
e54835c0 | 94 | } QEMU_PACKED VHDFooter; |
b9fa33a6 | 95 | |
e54835c0 | 96 | typedef struct vhd_dyndisk_header { |
2cfacb62 AL |
97 | char magic[8]; // "cxsparse" |
98 | ||
99 | // Offset of next header structure, 0xFFFFFFFF if none | |
100 | uint64_t data_offset; | |
101 | ||
102 | // Offset of the Block Allocation Table (BAT) | |
103 | uint64_t table_offset; | |
104 | ||
105 | uint32_t version; | |
106 | uint32_t max_table_entries; // 32bit/entry | |
107 | ||
108 | // 2 MB by default, must be a power of two | |
109 | uint32_t block_size; | |
110 | ||
111 | uint32_t checksum; | |
112 | uint8_t parent_uuid[16]; | |
113 | uint32_t parent_timestamp; | |
114 | uint32_t reserved; | |
115 | ||
116 | // Backing file name (in UTF-16) | |
117 | uint8_t parent_name[512]; | |
118 | ||
119 | struct { | |
120 | uint32_t platform; | |
121 | uint32_t data_space; | |
122 | uint32_t data_length; | |
123 | uint32_t reserved; | |
124 | uint64_t data_offset; | |
125 | } parent_locator[8]; | |
e54835c0 | 126 | } QEMU_PACKED VHDDynDiskHeader; |
6a0f9e82 FB |
127 | |
128 | typedef struct BDRVVPCState { | |
848c66e8 | 129 | CoMutex lock; |
15d35bc5 AL |
130 | uint8_t footer_buf[HEADER_SIZE]; |
131 | uint64_t free_data_block_offset; | |
2cfacb62 | 132 | int max_table_entries; |
6a0f9e82 | 133 | uint32_t *pagetable; |
15d35bc5 AL |
134 | uint64_t bat_offset; |
135 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 136 | |
2cfacb62 | 137 | uint32_t block_size; |
15d35bc5 | 138 | uint32_t bitmap_size; |
c540d53a JC |
139 | bool force_use_chs; |
140 | bool force_use_sz; | |
15d35bc5 | 141 | |
6a0f9e82 FB |
142 | #ifdef CACHE |
143 | uint8_t *pageentry_u8; | |
144 | uint32_t *pageentry_u32; | |
145 | uint16_t *pageentry_u16; | |
3b46e624 | 146 | |
6a0f9e82 FB |
147 | uint64_t last_bitmap; |
148 | #endif | |
612ff3d8 KW |
149 | |
150 | Error *migration_blocker; | |
6a0f9e82 FB |
151 | } BDRVVPCState; |
152 | ||
c540d53a JC |
153 | #define VPC_OPT_SIZE_CALC "force_size_calc" |
154 | static QemuOptsList vpc_runtime_opts = { | |
155 | .name = "vpc-runtime-opts", | |
156 | .head = QTAILQ_HEAD_INITIALIZER(vpc_runtime_opts.head), | |
157 | .desc = { | |
158 | { | |
159 | .name = VPC_OPT_SIZE_CALC, | |
160 | .type = QEMU_OPT_STRING, | |
161 | .help = "Force disk size calculation to use either CHS geometry, " | |
162 | "or use the disk current_size specified in the VHD footer. " | |
163 | "{chs, current_size}" | |
164 | }, | |
165 | { /* end of list */ } | |
166 | } | |
167 | }; | |
168 | ||
57c7d9e5 AL |
169 | static uint32_t vpc_checksum(uint8_t* buf, size_t size) |
170 | { | |
171 | uint32_t res = 0; | |
172 | int i; | |
173 | ||
174 | for (i = 0; i < size; i++) | |
175 | res += buf[i]; | |
176 | ||
177 | return ~res; | |
178 | } | |
179 | ||
180 | ||
6a0f9e82 FB |
181 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
182 | { | |
ffe8ab83 | 183 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
6a0f9e82 | 184 | return 100; |
6a0f9e82 FB |
185 | return 0; |
186 | } | |
187 | ||
c540d53a JC |
188 | static void vpc_parse_options(BlockDriverState *bs, QemuOpts *opts, |
189 | Error **errp) | |
190 | { | |
191 | BDRVVPCState *s = bs->opaque; | |
192 | const char *size_calc; | |
193 | ||
194 | size_calc = qemu_opt_get(opts, VPC_OPT_SIZE_CALC); | |
195 | ||
196 | if (!size_calc) { | |
197 | /* no override, use autodetect only */ | |
198 | } else if (!strcmp(size_calc, "current_size")) { | |
199 | s->force_use_sz = true; | |
200 | } else if (!strcmp(size_calc, "chs")) { | |
201 | s->force_use_chs = true; | |
202 | } else { | |
203 | error_setg(errp, "Invalid size calculation mode: '%s'", size_calc); | |
204 | } | |
205 | } | |
206 | ||
015a1036 HR |
207 | static int vpc_open(BlockDriverState *bs, QDict *options, int flags, |
208 | Error **errp) | |
6a0f9e82 FB |
209 | { |
210 | BDRVVPCState *s = bs->opaque; | |
66f82cee | 211 | int i; |
e54835c0 JC |
212 | VHDFooter *footer; |
213 | VHDDynDiskHeader *dyndisk_header; | |
c540d53a JC |
214 | QemuOpts *opts = NULL; |
215 | Error *local_err = NULL; | |
216 | bool use_chs; | |
b9fa33a6 | 217 | uint8_t buf[HEADER_SIZE]; |
57c7d9e5 | 218 | uint32_t checksum; |
97f1c45c | 219 | uint64_t computed_size; |
b15deac7 | 220 | uint64_t pagetable_size; |
24da78db | 221 | int disk_type = VHD_DYNAMIC; |
59294e46 | 222 | int ret; |
6a0f9e82 | 223 | |
c540d53a JC |
224 | opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort); |
225 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
226 | if (local_err) { | |
227 | error_propagate(errp, local_err); | |
228 | ret = -EINVAL; | |
229 | goto fail; | |
230 | } | |
231 | ||
232 | vpc_parse_options(bs, opts, &local_err); | |
233 | if (local_err) { | |
234 | error_propagate(errp, local_err); | |
235 | ret = -EINVAL; | |
236 | goto fail; | |
237 | } | |
238 | ||
9a4f4c31 | 239 | ret = bdrv_pread(bs->file->bs, 0, s->footer_buf, HEADER_SIZE); |
59294e46 | 240 | if (ret < 0) { |
6a0f9e82 | 241 | goto fail; |
59294e46 | 242 | } |
6a0f9e82 | 243 | |
e54835c0 | 244 | footer = (VHDFooter *) s->footer_buf; |
24da78db | 245 | if (strncmp(footer->creator, "conectix", 8)) { |
9a4f4c31 | 246 | int64_t offset = bdrv_getlength(bs->file->bs); |
59294e46 KW |
247 | if (offset < 0) { |
248 | ret = offset; | |
249 | goto fail; | |
250 | } else if (offset < HEADER_SIZE) { | |
251 | ret = -EINVAL; | |
24da78db CA |
252 | goto fail; |
253 | } | |
59294e46 | 254 | |
24da78db | 255 | /* If a fixed disk, the footer is found only at the end of the file */ |
9a4f4c31 | 256 | ret = bdrv_pread(bs->file->bs, offset-HEADER_SIZE, s->footer_buf, |
59294e46 KW |
257 | HEADER_SIZE); |
258 | if (ret < 0) { | |
24da78db CA |
259 | goto fail; |
260 | } | |
261 | if (strncmp(footer->creator, "conectix", 8)) { | |
76abe407 PB |
262 | error_setg(errp, "invalid VPC image"); |
263 | ret = -EINVAL; | |
24da78db CA |
264 | goto fail; |
265 | } | |
266 | disk_type = VHD_FIXED; | |
267 | } | |
6a0f9e82 | 268 | |
57c7d9e5 AL |
269 | checksum = be32_to_cpu(footer->checksum); |
270 | footer->checksum = 0; | |
271 | if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) | |
272 | fprintf(stderr, "block-vpc: The header checksum of '%s' is " | |
66f82cee | 273 | "incorrect.\n", bs->filename); |
57c7d9e5 | 274 | |
c088b691 | 275 | /* Write 'checksum' back to footer, or else will leave it with zero. */ |
a4127c42 | 276 | footer->checksum = cpu_to_be32(checksum); |
c088b691 | 277 | |
33ccf667 SH |
278 | // The visible size of a image in Virtual PC depends on the geometry |
279 | // rather than on the size stored in the footer (the size in the footer | |
280 | // is too large usually) | |
281 | bs->total_sectors = (int64_t) | |
282 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; | |
1fa79228 | 283 | |
c540d53a JC |
284 | /* Microsoft Virtual PC and Microsoft Hyper-V produce and read |
285 | * VHD image sizes differently. VPC will rely on CHS geometry, | |
286 | * while Hyper-V and disk2vhd use the size specified in the footer. | |
287 | * | |
288 | * We use a couple of approaches to try and determine the correct method: | |
289 | * look at the Creator App field, and look for images that have CHS | |
290 | * geometry that is the maximum value. | |
291 | * | |
292 | * If the CHS geometry is the maximum CHS geometry, then we assume that | |
293 | * the size is the footer->current_size to avoid truncation. Otherwise, | |
294 | * we follow the table based on footer->creator_app: | |
295 | * | |
296 | * Known creator apps: | |
297 | * 'vpc ' : CHS Virtual PC (uses disk geometry) | |
298 | * 'qemu' : CHS QEMU (uses disk geometry) | |
fb9245c2 | 299 | * 'qem2' : current_size QEMU (uses current_size) |
c540d53a JC |
300 | * 'win ' : current_size Hyper-V |
301 | * 'd2v ' : current_size Disk2vhd | |
302 | * | |
303 | * The user can override the table values via drive options, however | |
304 | * even with an override we will still use current_size for images | |
305 | * that have CHS geometry of the maximum size. | |
306 | */ | |
307 | use_chs = (!!strncmp(footer->creator_app, "win ", 4) && | |
fb9245c2 | 308 | !!strncmp(footer->creator_app, "qem2", 4) && |
c540d53a JC |
309 | !!strncmp(footer->creator_app, "d2v ", 4)) || s->force_use_chs; |
310 | ||
311 | if (!use_chs || bs->total_sectors == VHD_MAX_GEOMETRY || s->force_use_sz) { | |
03671ded | 312 | bs->total_sectors = be64_to_cpu(footer->current_size) / |
c540d53a | 313 | BDRV_SECTOR_SIZE; |
0173e7bb PL |
314 | } |
315 | ||
258d2edb | 316 | /* Allow a maximum disk size of approximately 2 TB */ |
97f1c45c | 317 | if (bs->total_sectors >= VHD_MAX_SECTORS) { |
59294e46 | 318 | ret = -EFBIG; |
efc8243d SH |
319 | goto fail; |
320 | } | |
321 | ||
24da78db | 322 | if (disk_type == VHD_DYNAMIC) { |
9a4f4c31 | 323 | ret = bdrv_pread(bs->file->bs, be64_to_cpu(footer->data_offset), buf, |
59294e46 KW |
324 | HEADER_SIZE); |
325 | if (ret < 0) { | |
24da78db CA |
326 | goto fail; |
327 | } | |
b9fa33a6 | 328 | |
e54835c0 | 329 | dyndisk_header = (VHDDynDiskHeader *) buf; |
6a0f9e82 | 330 | |
24da78db | 331 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { |
59294e46 | 332 | ret = -EINVAL; |
24da78db CA |
333 | goto fail; |
334 | } | |
6a0f9e82 | 335 | |
24da78db | 336 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
5e71dfad KW |
337 | if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { |
338 | error_setg(errp, "Invalid block size %" PRIu32, s->block_size); | |
339 | ret = -EINVAL; | |
340 | goto fail; | |
341 | } | |
24da78db | 342 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; |
15d35bc5 | 343 | |
24da78db | 344 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
97f1c45c JC |
345 | |
346 | if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { | |
347 | ret = -EINVAL; | |
348 | goto fail; | |
349 | } | |
350 | if (s->max_table_entries > (VHD_MAX_SECTORS * 512) / s->block_size) { | |
351 | ret = -EINVAL; | |
352 | goto fail; | |
353 | } | |
354 | ||
355 | computed_size = (uint64_t) s->max_table_entries * s->block_size; | |
356 | if (computed_size < bs->total_sectors * 512) { | |
357 | ret = -EINVAL; | |
358 | goto fail; | |
359 | } | |
360 | ||
b15deac7 JC |
361 | if (s->max_table_entries > SIZE_MAX / 4 || |
362 | s->max_table_entries > (int) INT_MAX / 4) { | |
363 | error_setg(errp, "Max Table Entries too large (%" PRId32 ")", | |
364 | s->max_table_entries); | |
365 | ret = -EINVAL; | |
366 | goto fail; | |
367 | } | |
368 | ||
369 | pagetable_size = (uint64_t) s->max_table_entries * 4; | |
370 | ||
9a4f4c31 | 371 | s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size); |
5fb09cd5 KW |
372 | if (s->pagetable == NULL) { |
373 | ret = -ENOMEM; | |
374 | goto fail; | |
375 | } | |
b71d1c2e | 376 | |
24da78db | 377 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
59294e46 | 378 | |
9a4f4c31 KW |
379 | ret = bdrv_pread(bs->file->bs, s->bat_offset, s->pagetable, |
380 | pagetable_size); | |
59294e46 | 381 | if (ret < 0) { |
24da78db CA |
382 | goto fail; |
383 | } | |
b71d1c2e | 384 | |
24da78db | 385 | s->free_data_block_offset = |
b15deac7 | 386 | ROUND_UP(s->bat_offset + pagetable_size, 512); |
15d35bc5 | 387 | |
24da78db CA |
388 | for (i = 0; i < s->max_table_entries; i++) { |
389 | be32_to_cpus(&s->pagetable[i]); | |
390 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
391 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
392 | s->bitmap_size + s->block_size; | |
15d35bc5 | 393 | |
24da78db CA |
394 | if (next > s->free_data_block_offset) { |
395 | s->free_data_block_offset = next; | |
396 | } | |
397 | } | |
15d35bc5 | 398 | } |
15d35bc5 | 399 | |
9a4f4c31 | 400 | if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) { |
fb8fe35f PL |
401 | error_setg(errp, "block-vpc: free_data_block_offset points after " |
402 | "the end of file. The image has been truncated."); | |
403 | ret = -EINVAL; | |
404 | goto fail; | |
405 | } | |
406 | ||
24da78db | 407 | s->last_bitmap_offset = (int64_t) -1; |
6a0f9e82 | 408 | |
6a0f9e82 | 409 | #ifdef CACHE |
24da78db CA |
410 | s->pageentry_u8 = g_malloc(512); |
411 | s->pageentry_u32 = s->pageentry_u8; | |
412 | s->pageentry_u16 = s->pageentry_u8; | |
413 | s->last_pagetable = -1; | |
6a0f9e82 | 414 | #endif |
24da78db | 415 | } |
6a0f9e82 | 416 | |
848c66e8 | 417 | qemu_co_mutex_init(&s->lock); |
612ff3d8 KW |
418 | |
419 | /* Disable migration when VHD images are used */ | |
81e5f78a AG |
420 | error_setg(&s->migration_blocker, "The vpc format used by node '%s' " |
421 | "does not support live migration", | |
422 | bdrv_get_device_or_node_name(bs)); | |
612ff3d8 KW |
423 | migrate_add_blocker(s->migration_blocker); |
424 | ||
6a0f9e82 | 425 | return 0; |
59294e46 KW |
426 | |
427 | fail: | |
97f1c45c | 428 | qemu_vfree(s->pagetable); |
59294e46 KW |
429 | #ifdef CACHE |
430 | g_free(s->pageentry_u8); | |
431 | #endif | |
432 | return ret; | |
6a0f9e82 FB |
433 | } |
434 | ||
3fe4b700 JC |
435 | static int vpc_reopen_prepare(BDRVReopenState *state, |
436 | BlockReopenQueue *queue, Error **errp) | |
437 | { | |
438 | return 0; | |
439 | } | |
440 | ||
b71d1c2e AL |
441 | /* |
442 | * Returns the absolute byte offset of the given sector in the image file. | |
443 | * If the sector is not allocated, -1 is returned instead. | |
15d35bc5 AL |
444 | * |
445 | * The parameter write must be 1 if the offset will be used for a write | |
446 | * operation (the block bitmaps is updated then), 0 otherwise. | |
b71d1c2e | 447 | */ |
15d35bc5 AL |
448 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
449 | int64_t sector_num, int write) | |
6a0f9e82 FB |
450 | { |
451 | BDRVVPCState *s = bs->opaque; | |
452 | uint64_t offset = sector_num * 512; | |
453 | uint64_t bitmap_offset, block_offset; | |
454 | uint32_t pagetable_index, pageentry_index; | |
455 | ||
2cfacb62 AL |
456 | pagetable_index = offset / s->block_size; |
457 | pageentry_index = (offset % s->block_size) / 512; | |
3b46e624 | 458 | |
15d35bc5 AL |
459 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
460 | return -1; // not allocated | |
6a0f9e82 | 461 | |
378e2aea | 462 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
15d35bc5 AL |
463 | block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); |
464 | ||
465 | // We must ensure that we don't write to any sectors which are marked as | |
466 | // unused in the bitmap. We get away with setting all bits in the block | |
467 | // bitmap each time we write to a new block. This might cause Virtual PC to | |
468 | // miss sparse read optimization, but it's not a problem in terms of | |
469 | // correctness. | |
470 | if (write && (s->last_bitmap_offset != bitmap_offset)) { | |
471 | uint8_t bitmap[s->bitmap_size]; | |
472 | ||
473 | s->last_bitmap_offset = bitmap_offset; | |
474 | memset(bitmap, 0xff, s->bitmap_size); | |
9a4f4c31 | 475 | bdrv_pwrite_sync(bs->file->bs, bitmap_offset, bitmap, s->bitmap_size); |
15d35bc5 | 476 | } |
3b46e624 | 477 | |
b71d1c2e | 478 | return block_offset; |
6a0f9e82 FB |
479 | } |
480 | ||
15d35bc5 AL |
481 | /* |
482 | * Writes the footer to the end of the image file. This is needed when the | |
483 | * file grows as it overwrites the old footer | |
484 | * | |
485 | * Returns 0 on success and < 0 on error | |
486 | */ | |
487 | static int rewrite_footer(BlockDriverState* bs) | |
488 | { | |
489 | int ret; | |
490 | BDRVVPCState *s = bs->opaque; | |
491 | int64_t offset = s->free_data_block_offset; | |
492 | ||
9a4f4c31 | 493 | ret = bdrv_pwrite_sync(bs->file->bs, offset, s->footer_buf, HEADER_SIZE); |
15d35bc5 AL |
494 | if (ret < 0) |
495 | return ret; | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | /* | |
501 | * Allocates a new block. This involves writing a new footer and updating | |
502 | * the Block Allocation Table to use the space at the old end of the image | |
503 | * file (overwriting the old footer) | |
504 | * | |
505 | * Returns the sectors' offset in the image file on success and < 0 on error | |
506 | */ | |
507 | static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) | |
508 | { | |
509 | BDRVVPCState *s = bs->opaque; | |
510 | int64_t bat_offset; | |
511 | uint32_t index, bat_value; | |
512 | int ret; | |
513 | uint8_t bitmap[s->bitmap_size]; | |
514 | ||
515 | // Check if sector_num is valid | |
516 | if ((sector_num < 0) || (sector_num > bs->total_sectors)) | |
517 | return -1; | |
518 | ||
519 | // Write entry into in-memory BAT | |
520 | index = (sector_num * 512) / s->block_size; | |
521 | if (s->pagetable[index] != 0xFFFFFFFF) | |
522 | return -1; | |
523 | ||
524 | s->pagetable[index] = s->free_data_block_offset / 512; | |
525 | ||
526 | // Initialize the block's bitmap | |
527 | memset(bitmap, 0xff, s->bitmap_size); | |
9a4f4c31 | 528 | ret = bdrv_pwrite_sync(bs->file->bs, s->free_data_block_offset, bitmap, |
078a458e | 529 | s->bitmap_size); |
5bb1cbac KW |
530 | if (ret < 0) { |
531 | return ret; | |
532 | } | |
15d35bc5 AL |
533 | |
534 | // Write new footer (the old one will be overwritten) | |
535 | s->free_data_block_offset += s->block_size + s->bitmap_size; | |
536 | ret = rewrite_footer(bs); | |
537 | if (ret < 0) | |
538 | goto fail; | |
539 | ||
540 | // Write BAT entry to disk | |
541 | bat_offset = s->bat_offset + (4 * index); | |
a4127c42 | 542 | bat_value = cpu_to_be32(s->pagetable[index]); |
9a4f4c31 | 543 | ret = bdrv_pwrite_sync(bs->file->bs, bat_offset, &bat_value, 4); |
15d35bc5 AL |
544 | if (ret < 0) |
545 | goto fail; | |
546 | ||
547 | return get_sector_offset(bs, sector_num, 0); | |
548 | ||
549 | fail: | |
550 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
551 | return -1; | |
552 | } | |
553 | ||
97b00e28 PB |
554 | static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
555 | { | |
556 | BDRVVPCState *s = (BDRVVPCState *)bs->opaque; | |
557 | VHDFooter *footer = (VHDFooter *) s->footer_buf; | |
558 | ||
0d4cc3e7 | 559 | if (be32_to_cpu(footer->type) != VHD_FIXED) { |
97b00e28 PB |
560 | bdi->cluster_size = s->block_size; |
561 | } | |
562 | ||
95de6d70 | 563 | bdi->unallocated_blocks_are_zero = true; |
97b00e28 PB |
564 | return 0; |
565 | } | |
566 | ||
5fafdf24 | 567 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
6a0f9e82 FB |
568 | uint8_t *buf, int nb_sectors) |
569 | { | |
6c6ea921 | 570 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 571 | int ret; |
b71d1c2e | 572 | int64_t offset; |
6c6ea921 | 573 | int64_t sectors, sectors_per_block; |
e54835c0 | 574 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
6a0f9e82 | 575 | |
0d4cc3e7 | 576 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
9a4f4c31 | 577 | return bdrv_read(bs->file->bs, sector_num, buf, nb_sectors); |
24da78db | 578 | } |
6a0f9e82 | 579 | while (nb_sectors > 0) { |
15d35bc5 | 580 | offset = get_sector_offset(bs, sector_num, 0); |
b71d1c2e | 581 | |
6c6ea921 KW |
582 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
583 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
584 | if (sectors > nb_sectors) { | |
585 | sectors = nb_sectors; | |
586 | } | |
587 | ||
b71d1c2e | 588 | if (offset == -1) { |
6c6ea921 | 589 | memset(buf, 0, sectors * BDRV_SECTOR_SIZE); |
b71d1c2e | 590 | } else { |
9a4f4c31 | 591 | ret = bdrv_pread(bs->file->bs, offset, buf, |
6c6ea921 KW |
592 | sectors * BDRV_SECTOR_SIZE); |
593 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
b71d1c2e | 594 | return -1; |
6c6ea921 | 595 | } |
b71d1c2e AL |
596 | } |
597 | ||
6c6ea921 KW |
598 | nb_sectors -= sectors; |
599 | sector_num += sectors; | |
600 | buf += sectors * BDRV_SECTOR_SIZE; | |
6a0f9e82 FB |
601 | } |
602 | return 0; | |
603 | } | |
604 | ||
2914caa0 PB |
605 | static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, |
606 | uint8_t *buf, int nb_sectors) | |
607 | { | |
608 | int ret; | |
609 | BDRVVPCState *s = bs->opaque; | |
610 | qemu_co_mutex_lock(&s->lock); | |
611 | ret = vpc_read(bs, sector_num, buf, nb_sectors); | |
612 | qemu_co_mutex_unlock(&s->lock); | |
613 | return ret; | |
614 | } | |
615 | ||
15d35bc5 AL |
616 | static int vpc_write(BlockDriverState *bs, int64_t sector_num, |
617 | const uint8_t *buf, int nb_sectors) | |
618 | { | |
6c6ea921 | 619 | BDRVVPCState *s = bs->opaque; |
15d35bc5 | 620 | int64_t offset; |
6c6ea921 | 621 | int64_t sectors, sectors_per_block; |
15d35bc5 | 622 | int ret; |
e54835c0 | 623 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
15d35bc5 | 624 | |
0d4cc3e7 | 625 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
9a4f4c31 | 626 | return bdrv_write(bs->file->bs, sector_num, buf, nb_sectors); |
24da78db | 627 | } |
15d35bc5 AL |
628 | while (nb_sectors > 0) { |
629 | offset = get_sector_offset(bs, sector_num, 1); | |
630 | ||
6c6ea921 KW |
631 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
632 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
633 | if (sectors > nb_sectors) { | |
634 | sectors = nb_sectors; | |
635 | } | |
636 | ||
15d35bc5 AL |
637 | if (offset == -1) { |
638 | offset = alloc_block(bs, sector_num); | |
639 | if (offset < 0) | |
640 | return -1; | |
641 | } | |
642 | ||
9a4f4c31 KW |
643 | ret = bdrv_pwrite(bs->file->bs, offset, buf, |
644 | sectors * BDRV_SECTOR_SIZE); | |
6c6ea921 | 645 | if (ret != sectors * BDRV_SECTOR_SIZE) { |
15d35bc5 | 646 | return -1; |
6c6ea921 | 647 | } |
15d35bc5 | 648 | |
6c6ea921 KW |
649 | nb_sectors -= sectors; |
650 | sector_num += sectors; | |
651 | buf += sectors * BDRV_SECTOR_SIZE; | |
15d35bc5 AL |
652 | } |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
e183ef75 PB |
657 | static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, |
658 | const uint8_t *buf, int nb_sectors) | |
659 | { | |
660 | int ret; | |
661 | BDRVVPCState *s = bs->opaque; | |
662 | qemu_co_mutex_lock(&s->lock); | |
663 | ret = vpc_write(bs, sector_num, buf, nb_sectors); | |
664 | qemu_co_mutex_unlock(&s->lock); | |
665 | return ret; | |
666 | } | |
667 | ||
0cc84887 | 668 | static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs, |
67a0fd2a | 669 | int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) |
0cc84887 KW |
670 | { |
671 | BDRVVPCState *s = bs->opaque; | |
672 | VHDFooter *footer = (VHDFooter*) s->footer_buf; | |
2ec711dc | 673 | int64_t start, offset; |
0cc84887 KW |
674 | bool allocated; |
675 | int n; | |
676 | ||
677 | if (be32_to_cpu(footer->type) == VHD_FIXED) { | |
678 | *pnum = nb_sectors; | |
7429e207 | 679 | *file = bs->file->bs; |
0cc84887 KW |
680 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | |
681 | (sector_num << BDRV_SECTOR_BITS); | |
682 | } | |
683 | ||
684 | offset = get_sector_offset(bs, sector_num, 0); | |
685 | start = offset; | |
686 | allocated = (offset != -1); | |
687 | *pnum = 0; | |
688 | ||
689 | do { | |
690 | /* All sectors in a block are contiguous (without using the bitmap) */ | |
691 | n = ROUND_UP(sector_num + 1, s->block_size / BDRV_SECTOR_SIZE) | |
692 | - sector_num; | |
693 | n = MIN(n, nb_sectors); | |
694 | ||
695 | *pnum += n; | |
696 | sector_num += n; | |
697 | nb_sectors -= n; | |
2ec711dc PL |
698 | /* *pnum can't be greater than one block for allocated |
699 | * sectors since there is always a bitmap in between. */ | |
700 | if (allocated) { | |
7429e207 | 701 | *file = bs->file->bs; |
2ec711dc PL |
702 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start; |
703 | } | |
0cc84887 KW |
704 | if (nb_sectors == 0) { |
705 | break; | |
706 | } | |
0cc84887 | 707 | offset = get_sector_offset(bs, sector_num, 0); |
2ec711dc | 708 | } while (offset == -1); |
0cc84887 | 709 | |
2ec711dc | 710 | return 0; |
0cc84887 KW |
711 | } |
712 | ||
57c7d9e5 AL |
713 | /* |
714 | * Calculates the number of cylinders, heads and sectors per cylinder | |
715 | * based on a given number of sectors. This is the algorithm described | |
716 | * in the VHD specification. | |
717 | * | |
718 | * Note that the geometry doesn't always exactly match total_sectors but | |
719 | * may round it down. | |
6e9ea0c0 | 720 | * |
258d2edb CA |
721 | * Returns 0 on success, -EFBIG if the size is larger than ~2 TB. Override |
722 | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) | |
723 | * and instead allow up to 255 heads. | |
57c7d9e5 | 724 | */ |
6e9ea0c0 | 725 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
57c7d9e5 AL |
726 | uint8_t* heads, uint8_t* secs_per_cyl) |
727 | { | |
728 | uint32_t cyls_times_heads; | |
729 | ||
690cbb09 | 730 | total_sectors = MIN(total_sectors, VHD_MAX_GEOMETRY); |
57c7d9e5 | 731 | |
690cbb09 | 732 | if (total_sectors >= 65535LL * 16 * 63) { |
57c7d9e5 | 733 | *secs_per_cyl = 255; |
690cbb09 | 734 | *heads = 16; |
57c7d9e5 AL |
735 | cyls_times_heads = total_sectors / *secs_per_cyl; |
736 | } else { | |
737 | *secs_per_cyl = 17; | |
738 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
739 | *heads = (cyls_times_heads + 1023) / 1024; | |
740 | ||
690cbb09 | 741 | if (*heads < 4) { |
57c7d9e5 | 742 | *heads = 4; |
690cbb09 | 743 | } |
57c7d9e5 AL |
744 | |
745 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
746 | *secs_per_cyl = 31; | |
747 | *heads = 16; | |
748 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
749 | } | |
750 | ||
751 | if (cyls_times_heads >= (*heads * 1024)) { | |
752 | *secs_per_cyl = 63; | |
753 | *heads = 16; | |
754 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
755 | } | |
756 | } | |
757 | ||
dede4188 | 758 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
759 | |
760 | return 0; | |
57c7d9e5 AL |
761 | } |
762 | ||
b8f45cdf | 763 | static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, |
fef6070e | 764 | int64_t total_sectors) |
57c7d9e5 | 765 | { |
e54835c0 JC |
766 | VHDDynDiskHeader *dyndisk_header = |
767 | (VHDDynDiskHeader *) buf; | |
57c7d9e5 | 768 | size_t block_size, num_bat_entries; |
24da78db | 769 | int i; |
fef6070e JC |
770 | int ret; |
771 | int64_t offset = 0; | |
57c7d9e5 | 772 | |
57c7d9e5 AL |
773 | // Write the footer (twice: at the beginning and at the end) |
774 | block_size = 0x200000; | |
775 | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); | |
776 | ||
b8f45cdf | 777 | ret = blk_pwrite(blk, offset, buf, HEADER_SIZE); |
40a99aac | 778 | if (ret < 0) { |
f0ff243a BS |
779 | goto fail; |
780 | } | |
57c7d9e5 | 781 | |
fef6070e | 782 | offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); |
b8f45cdf | 783 | ret = blk_pwrite(blk, offset, buf, HEADER_SIZE); |
fef6070e | 784 | if (ret < 0) { |
f0ff243a BS |
785 | goto fail; |
786 | } | |
57c7d9e5 AL |
787 | |
788 | // Write the initial BAT | |
fef6070e | 789 | offset = 3 * 512; |
57c7d9e5 AL |
790 | |
791 | memset(buf, 0xFF, 512); | |
f0ff243a | 792 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
b8f45cdf | 793 | ret = blk_pwrite(blk, offset, buf, 512); |
fef6070e | 794 | if (ret < 0) { |
f0ff243a BS |
795 | goto fail; |
796 | } | |
fef6070e | 797 | offset += 512; |
f0ff243a | 798 | } |
57c7d9e5 | 799 | |
57c7d9e5 AL |
800 | // Prepare the Dynamic Disk Header |
801 | memset(buf, 0, 1024); | |
802 | ||
5ec4d682 | 803 | memcpy(dyndisk_header->magic, "cxsparse", 8); |
57c7d9e5 | 804 | |
78439f6a CA |
805 | /* |
806 | * Note: The spec is actually wrong here for data_offset, it says | |
807 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. | |
808 | */ | |
a4127c42 SH |
809 | dyndisk_header->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
810 | dyndisk_header->table_offset = cpu_to_be64(3 * 512); | |
811 | dyndisk_header->version = cpu_to_be32(0x00010000); | |
812 | dyndisk_header->block_size = cpu_to_be32(block_size); | |
813 | dyndisk_header->max_table_entries = cpu_to_be32(num_bat_entries); | |
57c7d9e5 | 814 | |
a4127c42 | 815 | dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024)); |
57c7d9e5 AL |
816 | |
817 | // Write the header | |
fef6070e | 818 | offset = 512; |
57c7d9e5 | 819 | |
b8f45cdf | 820 | ret = blk_pwrite(blk, offset, buf, 1024); |
fef6070e | 821 | if (ret < 0) { |
f0ff243a BS |
822 | goto fail; |
823 | } | |
f0ff243a | 824 | |
24da78db CA |
825 | fail: |
826 | return ret; | |
827 | } | |
828 | ||
b8f45cdf | 829 | static int create_fixed_disk(BlockBackend *blk, uint8_t *buf, |
fef6070e | 830 | int64_t total_size) |
24da78db | 831 | { |
fef6070e | 832 | int ret; |
24da78db CA |
833 | |
834 | /* Add footer to total size */ | |
fef6070e JC |
835 | total_size += HEADER_SIZE; |
836 | ||
b8f45cdf | 837 | ret = blk_truncate(blk, total_size); |
fef6070e JC |
838 | if (ret < 0) { |
839 | return ret; | |
24da78db CA |
840 | } |
841 | ||
b8f45cdf | 842 | ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE); |
fef6070e JC |
843 | if (ret < 0) { |
844 | return ret; | |
845 | } | |
24da78db | 846 | |
24da78db CA |
847 | return ret; |
848 | } | |
849 | ||
fec9921f | 850 | static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) |
24da78db CA |
851 | { |
852 | uint8_t buf[1024]; | |
e54835c0 | 853 | VHDFooter *footer = (VHDFooter *) buf; |
fec9921f | 854 | char *disk_type_param; |
fef6070e | 855 | int i; |
24da78db CA |
856 | uint16_t cyls = 0; |
857 | uint8_t heads = 0; | |
858 | uint8_t secs_per_cyl = 0; | |
859 | int64_t total_sectors; | |
860 | int64_t total_size; | |
861 | int disk_type; | |
862 | int ret = -EIO; | |
fb9245c2 | 863 | bool force_size; |
fef6070e | 864 | Error *local_err = NULL; |
b8f45cdf | 865 | BlockBackend *blk = NULL; |
24da78db CA |
866 | |
867 | /* Read out options */ | |
c2eb918e HT |
868 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
869 | BDRV_SECTOR_SIZE); | |
fec9921f CL |
870 | disk_type_param = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); |
871 | if (disk_type_param) { | |
872 | if (!strcmp(disk_type_param, "dynamic")) { | |
24da78db | 873 | disk_type = VHD_DYNAMIC; |
fec9921f | 874 | } else if (!strcmp(disk_type_param, "fixed")) { |
24da78db CA |
875 | disk_type = VHD_FIXED; |
876 | } else { | |
fec9921f CL |
877 | ret = -EINVAL; |
878 | goto out; | |
24da78db CA |
879 | } |
880 | } else { | |
881 | disk_type = VHD_DYNAMIC; | |
882 | } | |
883 | ||
fb9245c2 JC |
884 | force_size = qemu_opt_get_bool_del(opts, VPC_OPT_FORCE_SIZE, false); |
885 | ||
fef6070e JC |
886 | ret = bdrv_create_file(filename, opts, &local_err); |
887 | if (ret < 0) { | |
888 | error_propagate(errp, local_err); | |
fec9921f | 889 | goto out; |
24da78db | 890 | } |
b8f45cdf | 891 | |
efaa7c4e | 892 | blk = blk_new_open(filename, NULL, NULL, |
72e775c7 | 893 | BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); |
b8f45cdf | 894 | if (blk == NULL) { |
fef6070e | 895 | error_propagate(errp, local_err); |
b8f45cdf | 896 | ret = -EIO; |
fef6070e | 897 | goto out; |
4ab15590 CL |
898 | } |
899 | ||
b8f45cdf KW |
900 | blk_set_allow_write_beyond_eof(blk, true); |
901 | ||
ecd880d9 KW |
902 | /* |
903 | * Calculate matching total_size and geometry. Increase the number of | |
904 | * sectors requested until we get enough (or fail). This ensures that | |
905 | * qemu-img convert doesn't truncate images, but rather rounds up. | |
690cbb09 | 906 | * |
fb9245c2 | 907 | * If the image size can't be represented by a spec conformant CHS geometry, |
690cbb09 PL |
908 | * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use |
909 | * the image size from the VHD footer to calculate total_sectors. | |
ecd880d9 | 910 | */ |
fb9245c2 JC |
911 | if (force_size) { |
912 | /* This will force the use of total_size for sector count, below */ | |
913 | cyls = VHD_CHS_MAX_C; | |
914 | heads = VHD_CHS_MAX_H; | |
915 | secs_per_cyl = VHD_CHS_MAX_S; | |
916 | } else { | |
917 | total_sectors = MIN(VHD_MAX_GEOMETRY, total_size / BDRV_SECTOR_SIZE); | |
918 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { | |
919 | calculate_geometry(total_sectors + i, &cyls, &heads, &secs_per_cyl); | |
920 | } | |
690cbb09 PL |
921 | } |
922 | ||
923 | if ((int64_t)cyls * heads * secs_per_cyl == VHD_MAX_GEOMETRY) { | |
924 | total_sectors = total_size / BDRV_SECTOR_SIZE; | |
925 | /* Allow a maximum disk size of approximately 2 TB */ | |
926 | if (total_sectors > VHD_MAX_SECTORS) { | |
24da78db | 927 | ret = -EFBIG; |
fef6070e | 928 | goto out; |
24da78db | 929 | } |
690cbb09 PL |
930 | } else { |
931 | total_sectors = (int64_t)cyls * heads * secs_per_cyl; | |
932 | total_size = total_sectors * BDRV_SECTOR_SIZE; | |
24da78db | 933 | } |
ecd880d9 | 934 | |
24da78db CA |
935 | /* Prepare the Hard Disk Footer */ |
936 | memset(buf, 0, 1024); | |
937 | ||
938 | memcpy(footer->creator, "conectix", 8); | |
fb9245c2 JC |
939 | if (force_size) { |
940 | memcpy(footer->creator_app, "qem2", 4); | |
941 | } else { | |
942 | memcpy(footer->creator_app, "qemu", 4); | |
943 | } | |
24da78db CA |
944 | memcpy(footer->creator_os, "Wi2k", 4); |
945 | ||
a4127c42 SH |
946 | footer->features = cpu_to_be32(0x02); |
947 | footer->version = cpu_to_be32(0x00010000); | |
24da78db | 948 | if (disk_type == VHD_DYNAMIC) { |
a4127c42 | 949 | footer->data_offset = cpu_to_be64(HEADER_SIZE); |
24da78db | 950 | } else { |
a4127c42 | 951 | footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
24da78db | 952 | } |
a4127c42 | 953 | footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); |
24da78db CA |
954 | |
955 | /* Version of Virtual PC 2007 */ | |
a4127c42 SH |
956 | footer->major = cpu_to_be16(0x0005); |
957 | footer->minor = cpu_to_be16(0x0003); | |
3f3f20dc | 958 | footer->orig_size = cpu_to_be64(total_size); |
03671ded | 959 | footer->current_size = cpu_to_be64(total_size); |
a4127c42 | 960 | footer->cyls = cpu_to_be16(cyls); |
24da78db CA |
961 | footer->heads = heads; |
962 | footer->secs_per_cyl = secs_per_cyl; | |
963 | ||
a4127c42 | 964 | footer->type = cpu_to_be32(disk_type); |
24da78db | 965 | |
1fe1fa51 CA |
966 | #if defined(CONFIG_UUID) |
967 | uuid_generate(footer->uuid); | |
968 | #endif | |
24da78db | 969 | |
a4127c42 | 970 | footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE)); |
24da78db CA |
971 | |
972 | if (disk_type == VHD_DYNAMIC) { | |
b8f45cdf | 973 | ret = create_dynamic_disk(blk, buf, total_sectors); |
24da78db | 974 | } else { |
b8f45cdf | 975 | ret = create_fixed_disk(blk, buf, total_size); |
24da78db CA |
976 | } |
977 | ||
fec9921f | 978 | out: |
b8f45cdf | 979 | blk_unref(blk); |
fec9921f | 980 | g_free(disk_type_param); |
f0ff243a | 981 | return ret; |
57c7d9e5 AL |
982 | } |
983 | ||
72c6cc94 KW |
984 | static int vpc_has_zero_init(BlockDriverState *bs) |
985 | { | |
986 | BDRVVPCState *s = bs->opaque; | |
e54835c0 | 987 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
72c6cc94 | 988 | |
0d4cc3e7 | 989 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
9a4f4c31 | 990 | return bdrv_has_zero_init(bs->file->bs); |
72c6cc94 KW |
991 | } else { |
992 | return 1; | |
993 | } | |
994 | } | |
995 | ||
6a0f9e82 FB |
996 | static void vpc_close(BlockDriverState *bs) |
997 | { | |
998 | BDRVVPCState *s = bs->opaque; | |
97f1c45c | 999 | qemu_vfree(s->pagetable); |
6a0f9e82 | 1000 | #ifdef CACHE |
7267c094 | 1001 | g_free(s->pageentry_u8); |
6a0f9e82 | 1002 | #endif |
612ff3d8 KW |
1003 | |
1004 | migrate_del_blocker(s->migration_blocker); | |
1005 | error_free(s->migration_blocker); | |
6a0f9e82 FB |
1006 | } |
1007 | ||
fec9921f CL |
1008 | static QemuOptsList vpc_create_opts = { |
1009 | .name = "vpc-create-opts", | |
1010 | .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head), | |
1011 | .desc = { | |
1012 | { | |
1013 | .name = BLOCK_OPT_SIZE, | |
1014 | .type = QEMU_OPT_SIZE, | |
1015 | .help = "Virtual disk size" | |
1016 | }, | |
1017 | { | |
1018 | .name = BLOCK_OPT_SUBFMT, | |
1019 | .type = QEMU_OPT_STRING, | |
1020 | .help = | |
1021 | "Type of virtual hard disk format. Supported formats are " | |
1022 | "{dynamic (default) | fixed} " | |
1023 | }, | |
fb9245c2 JC |
1024 | { |
1025 | .name = VPC_OPT_FORCE_SIZE, | |
1026 | .type = QEMU_OPT_BOOL, | |
1027 | .help = "Force disk size calculation to use the actual size " | |
1028 | "specified, rather than using the nearest CHS-based " | |
1029 | "calculation" | |
1030 | }, | |
fec9921f CL |
1031 | { /* end of list */ } |
1032 | } | |
0e7e1989 KW |
1033 | }; |
1034 | ||
5efa9d5a | 1035 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
1036 | .format_name = "vpc", |
1037 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 1038 | |
72c6cc94 KW |
1039 | .bdrv_probe = vpc_probe, |
1040 | .bdrv_open = vpc_open, | |
1041 | .bdrv_close = vpc_close, | |
1042 | .bdrv_reopen_prepare = vpc_reopen_prepare, | |
c282e1fd | 1043 | .bdrv_create = vpc_create, |
0e7e1989 | 1044 | |
0cc84887 KW |
1045 | .bdrv_read = vpc_co_read, |
1046 | .bdrv_write = vpc_co_write, | |
1047 | .bdrv_co_get_block_status = vpc_co_get_block_status, | |
c68b89ac | 1048 | |
97b00e28 PB |
1049 | .bdrv_get_info = vpc_get_info, |
1050 | ||
fec9921f | 1051 | .create_opts = &vpc_create_opts, |
72c6cc94 | 1052 | .bdrv_has_zero_init = vpc_has_zero_init, |
6a0f9e82 | 1053 | }; |
5efa9d5a AL |
1054 | |
1055 | static void bdrv_vpc_init(void) | |
1056 | { | |
1057 | bdrv_register(&bdrv_vpc); | |
1058 | } | |
1059 | ||
1060 | block_init(bdrv_vpc_init); |