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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 | ||
9c057d0b | 48 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
57c7d9e5 AL |
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 | ||
c23fb11b | 55 | #define VHD_MAX_SECTORS 0xff000000 /* 2040 GiB max image size */ |
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 | |
9c057d0b | 60 | /* always big-endian */ |
e54835c0 | 61 | typedef struct vhd_footer { |
9c057d0b | 62 | char creator[8]; /* "conectix" */ |
2cfacb62 AL |
63 | uint32_t features; |
64 | uint32_t version; | |
65 | ||
9c057d0b | 66 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
2cfacb62 AL |
67 | uint64_t data_offset; |
68 | ||
9c057d0b | 69 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
2cfacb62 AL |
70 | uint32_t timestamp; |
71 | ||
9c057d0b | 72 | char creator_app[4]; /* e.g., "vpc " */ |
2cfacb62 AL |
73 | uint16_t major; |
74 | uint16_t minor; | |
9c057d0b | 75 | char creator_os[4]; /* "Wi2k" */ |
2cfacb62 AL |
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 | ||
9c057d0b JC |
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") */ | |
2cfacb62 AL |
88 | uint32_t checksum; |
89 | ||
9c057d0b | 90 | /* UUID used to identify a parent hard disk (backing file) */ |
2cfacb62 AL |
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 { |
9c057d0b | 97 | char magic[8]; /* "cxsparse" */ |
2cfacb62 | 98 | |
9c057d0b | 99 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
2cfacb62 AL |
100 | uint64_t data_offset; |
101 | ||
9c057d0b | 102 | /* Offset of the Block Allocation Table (BAT) */ |
2cfacb62 AL |
103 | uint64_t table_offset; |
104 | ||
105 | uint32_t version; | |
9c057d0b | 106 | uint32_t max_table_entries; /* 32bit/entry */ |
2cfacb62 | 107 | |
9c057d0b | 108 | /* 2 MB by default, must be a power of two */ |
2cfacb62 AL |
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 | ||
9c057d0b | 116 | /* Backing file name (in UTF-16) */ |
2cfacb62 AL |
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) { |
32f6439c | 241 | error_setg(errp, "Unable to read VHD header"); |
6a0f9e82 | 242 | goto fail; |
59294e46 | 243 | } |
6a0f9e82 | 244 | |
e54835c0 | 245 | footer = (VHDFooter *) s->footer_buf; |
24da78db | 246 | if (strncmp(footer->creator, "conectix", 8)) { |
9a4f4c31 | 247 | int64_t offset = bdrv_getlength(bs->file->bs); |
59294e46 KW |
248 | if (offset < 0) { |
249 | ret = offset; | |
32f6439c | 250 | error_setg(errp, "Invalid file size"); |
59294e46 KW |
251 | goto fail; |
252 | } else if (offset < HEADER_SIZE) { | |
253 | ret = -EINVAL; | |
32f6439c | 254 | error_setg(errp, "File too small for a VHD header"); |
24da78db CA |
255 | goto fail; |
256 | } | |
59294e46 | 257 | |
24da78db | 258 | /* If a fixed disk, the footer is found only at the end of the file */ |
9a4f4c31 | 259 | ret = bdrv_pread(bs->file->bs, offset-HEADER_SIZE, s->footer_buf, |
59294e46 KW |
260 | HEADER_SIZE); |
261 | if (ret < 0) { | |
24da78db CA |
262 | goto fail; |
263 | } | |
264 | if (strncmp(footer->creator, "conectix", 8)) { | |
76abe407 PB |
265 | error_setg(errp, "invalid VPC image"); |
266 | ret = -EINVAL; | |
24da78db CA |
267 | goto fail; |
268 | } | |
269 | disk_type = VHD_FIXED; | |
270 | } | |
6a0f9e82 | 271 | |
57c7d9e5 AL |
272 | checksum = be32_to_cpu(footer->checksum); |
273 | footer->checksum = 0; | |
274 | if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) | |
275 | fprintf(stderr, "block-vpc: The header checksum of '%s' is " | |
66f82cee | 276 | "incorrect.\n", bs->filename); |
57c7d9e5 | 277 | |
c088b691 | 278 | /* Write 'checksum' back to footer, or else will leave it with zero. */ |
a4127c42 | 279 | footer->checksum = cpu_to_be32(checksum); |
c088b691 | 280 | |
9c057d0b JC |
281 | /* The visible size of a image in Virtual PC depends on the geometry |
282 | rather than on the size stored in the footer (the size in the footer | |
283 | is too large usually) */ | |
33ccf667 SH |
284 | bs->total_sectors = (int64_t) |
285 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; | |
1fa79228 | 286 | |
c540d53a JC |
287 | /* Microsoft Virtual PC and Microsoft Hyper-V produce and read |
288 | * VHD image sizes differently. VPC will rely on CHS geometry, | |
289 | * while Hyper-V and disk2vhd use the size specified in the footer. | |
290 | * | |
291 | * We use a couple of approaches to try and determine the correct method: | |
292 | * look at the Creator App field, and look for images that have CHS | |
293 | * geometry that is the maximum value. | |
294 | * | |
295 | * If the CHS geometry is the maximum CHS geometry, then we assume that | |
296 | * the size is the footer->current_size to avoid truncation. Otherwise, | |
297 | * we follow the table based on footer->creator_app: | |
298 | * | |
299 | * Known creator apps: | |
300 | * 'vpc ' : CHS Virtual PC (uses disk geometry) | |
301 | * 'qemu' : CHS QEMU (uses disk geometry) | |
fb9245c2 | 302 | * 'qem2' : current_size QEMU (uses current_size) |
c540d53a JC |
303 | * 'win ' : current_size Hyper-V |
304 | * 'd2v ' : current_size Disk2vhd | |
9bdfb9e8 | 305 | * 'tap\0' : current_size XenServer |
bab246db | 306 | * 'CTXS' : current_size XenConverter |
c540d53a JC |
307 | * |
308 | * The user can override the table values via drive options, however | |
309 | * even with an override we will still use current_size for images | |
310 | * that have CHS geometry of the maximum size. | |
311 | */ | |
312 | use_chs = (!!strncmp(footer->creator_app, "win ", 4) && | |
fb9245c2 | 313 | !!strncmp(footer->creator_app, "qem2", 4) && |
9bdfb9e8 | 314 | !!strncmp(footer->creator_app, "d2v ", 4) && |
bab246db | 315 | !!strncmp(footer->creator_app, "CTXS", 4) && |
9bdfb9e8 | 316 | !!memcmp(footer->creator_app, "tap", 4)) || s->force_use_chs; |
c540d53a JC |
317 | |
318 | if (!use_chs || bs->total_sectors == VHD_MAX_GEOMETRY || s->force_use_sz) { | |
03671ded | 319 | bs->total_sectors = be64_to_cpu(footer->current_size) / |
c540d53a | 320 | BDRV_SECTOR_SIZE; |
0173e7bb PL |
321 | } |
322 | ||
c23fb11b JC |
323 | /* Allow a maximum disk size of 2040 GiB */ |
324 | if (bs->total_sectors > VHD_MAX_SECTORS) { | |
59294e46 | 325 | ret = -EFBIG; |
efc8243d SH |
326 | goto fail; |
327 | } | |
328 | ||
24da78db | 329 | if (disk_type == VHD_DYNAMIC) { |
9a4f4c31 | 330 | ret = bdrv_pread(bs->file->bs, be64_to_cpu(footer->data_offset), buf, |
59294e46 KW |
331 | HEADER_SIZE); |
332 | if (ret < 0) { | |
32f6439c | 333 | error_setg(errp, "Error reading dynamic VHD header"); |
24da78db CA |
334 | goto fail; |
335 | } | |
b9fa33a6 | 336 | |
e54835c0 | 337 | dyndisk_header = (VHDDynDiskHeader *) buf; |
6a0f9e82 | 338 | |
24da78db | 339 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { |
32f6439c | 340 | error_setg(errp, "Invalid header magic"); |
59294e46 | 341 | ret = -EINVAL; |
24da78db CA |
342 | goto fail; |
343 | } | |
6a0f9e82 | 344 | |
24da78db | 345 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
5e71dfad KW |
346 | if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { |
347 | error_setg(errp, "Invalid block size %" PRIu32, s->block_size); | |
348 | ret = -EINVAL; | |
349 | goto fail; | |
350 | } | |
24da78db | 351 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; |
15d35bc5 | 352 | |
24da78db | 353 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
97f1c45c JC |
354 | |
355 | if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { | |
32f6439c | 356 | error_setg(errp, "Too many blocks"); |
97f1c45c JC |
357 | ret = -EINVAL; |
358 | goto fail; | |
359 | } | |
97f1c45c JC |
360 | |
361 | computed_size = (uint64_t) s->max_table_entries * s->block_size; | |
362 | if (computed_size < bs->total_sectors * 512) { | |
32f6439c | 363 | error_setg(errp, "Page table too small"); |
97f1c45c JC |
364 | ret = -EINVAL; |
365 | goto fail; | |
366 | } | |
367 | ||
b15deac7 JC |
368 | if (s->max_table_entries > SIZE_MAX / 4 || |
369 | s->max_table_entries > (int) INT_MAX / 4) { | |
370 | error_setg(errp, "Max Table Entries too large (%" PRId32 ")", | |
371 | s->max_table_entries); | |
372 | ret = -EINVAL; | |
373 | goto fail; | |
374 | } | |
375 | ||
376 | pagetable_size = (uint64_t) s->max_table_entries * 4; | |
377 | ||
9a4f4c31 | 378 | s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size); |
5fb09cd5 | 379 | if (s->pagetable == NULL) { |
32f6439c | 380 | error_setg(errp, "Unable to allocate memory for page table"); |
5fb09cd5 KW |
381 | ret = -ENOMEM; |
382 | goto fail; | |
383 | } | |
b71d1c2e | 384 | |
24da78db | 385 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
59294e46 | 386 | |
9a4f4c31 KW |
387 | ret = bdrv_pread(bs->file->bs, s->bat_offset, s->pagetable, |
388 | pagetable_size); | |
59294e46 | 389 | if (ret < 0) { |
32f6439c | 390 | error_setg(errp, "Error reading pagetable"); |
24da78db CA |
391 | goto fail; |
392 | } | |
b71d1c2e | 393 | |
24da78db | 394 | s->free_data_block_offset = |
b15deac7 | 395 | ROUND_UP(s->bat_offset + pagetable_size, 512); |
15d35bc5 | 396 | |
24da78db CA |
397 | for (i = 0; i < s->max_table_entries; i++) { |
398 | be32_to_cpus(&s->pagetable[i]); | |
399 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
400 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
401 | s->bitmap_size + s->block_size; | |
15d35bc5 | 402 | |
24da78db CA |
403 | if (next > s->free_data_block_offset) { |
404 | s->free_data_block_offset = next; | |
405 | } | |
406 | } | |
15d35bc5 | 407 | } |
15d35bc5 | 408 | |
9a4f4c31 | 409 | if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) { |
fb8fe35f PL |
410 | error_setg(errp, "block-vpc: free_data_block_offset points after " |
411 | "the end of file. The image has been truncated."); | |
412 | ret = -EINVAL; | |
413 | goto fail; | |
414 | } | |
415 | ||
24da78db | 416 | s->last_bitmap_offset = (int64_t) -1; |
6a0f9e82 | 417 | |
6a0f9e82 | 418 | #ifdef CACHE |
24da78db CA |
419 | s->pageentry_u8 = g_malloc(512); |
420 | s->pageentry_u32 = s->pageentry_u8; | |
421 | s->pageentry_u16 = s->pageentry_u8; | |
422 | s->last_pagetable = -1; | |
6a0f9e82 | 423 | #endif |
24da78db | 424 | } |
6a0f9e82 | 425 | |
848c66e8 | 426 | qemu_co_mutex_init(&s->lock); |
612ff3d8 KW |
427 | |
428 | /* Disable migration when VHD images are used */ | |
81e5f78a AG |
429 | error_setg(&s->migration_blocker, "The vpc format used by node '%s' " |
430 | "does not support live migration", | |
431 | bdrv_get_device_or_node_name(bs)); | |
612ff3d8 KW |
432 | migrate_add_blocker(s->migration_blocker); |
433 | ||
6a0f9e82 | 434 | return 0; |
59294e46 KW |
435 | |
436 | fail: | |
97f1c45c | 437 | qemu_vfree(s->pagetable); |
59294e46 KW |
438 | #ifdef CACHE |
439 | g_free(s->pageentry_u8); | |
440 | #endif | |
441 | return ret; | |
6a0f9e82 FB |
442 | } |
443 | ||
3fe4b700 JC |
444 | static int vpc_reopen_prepare(BDRVReopenState *state, |
445 | BlockReopenQueue *queue, Error **errp) | |
446 | { | |
447 | return 0; | |
448 | } | |
449 | ||
b71d1c2e AL |
450 | /* |
451 | * Returns the absolute byte offset of the given sector in the image file. | |
452 | * If the sector is not allocated, -1 is returned instead. | |
15d35bc5 AL |
453 | * |
454 | * The parameter write must be 1 if the offset will be used for a write | |
455 | * operation (the block bitmaps is updated then), 0 otherwise. | |
b71d1c2e | 456 | */ |
15d35bc5 AL |
457 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
458 | int64_t sector_num, int write) | |
6a0f9e82 FB |
459 | { |
460 | BDRVVPCState *s = bs->opaque; | |
461 | uint64_t offset = sector_num * 512; | |
462 | uint64_t bitmap_offset, block_offset; | |
463 | uint32_t pagetable_index, pageentry_index; | |
464 | ||
2cfacb62 AL |
465 | pagetable_index = offset / s->block_size; |
466 | pageentry_index = (offset % s->block_size) / 512; | |
3b46e624 | 467 | |
15d35bc5 | 468 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
9c057d0b | 469 | return -1; /* not allocated */ |
6a0f9e82 | 470 | |
378e2aea | 471 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
15d35bc5 AL |
472 | block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); |
473 | ||
9c057d0b JC |
474 | /* We must ensure that we don't write to any sectors which are marked as |
475 | unused in the bitmap. We get away with setting all bits in the block | |
476 | bitmap each time we write to a new block. This might cause Virtual PC to | |
477 | miss sparse read optimization, but it's not a problem in terms of | |
478 | correctness. */ | |
15d35bc5 AL |
479 | if (write && (s->last_bitmap_offset != bitmap_offset)) { |
480 | uint8_t bitmap[s->bitmap_size]; | |
481 | ||
482 | s->last_bitmap_offset = bitmap_offset; | |
483 | memset(bitmap, 0xff, s->bitmap_size); | |
9a4f4c31 | 484 | bdrv_pwrite_sync(bs->file->bs, bitmap_offset, bitmap, s->bitmap_size); |
15d35bc5 | 485 | } |
3b46e624 | 486 | |
b71d1c2e | 487 | return block_offset; |
6a0f9e82 FB |
488 | } |
489 | ||
15d35bc5 AL |
490 | /* |
491 | * Writes the footer to the end of the image file. This is needed when the | |
492 | * file grows as it overwrites the old footer | |
493 | * | |
494 | * Returns 0 on success and < 0 on error | |
495 | */ | |
496 | static int rewrite_footer(BlockDriverState* bs) | |
497 | { | |
498 | int ret; | |
499 | BDRVVPCState *s = bs->opaque; | |
500 | int64_t offset = s->free_data_block_offset; | |
501 | ||
9a4f4c31 | 502 | ret = bdrv_pwrite_sync(bs->file->bs, offset, s->footer_buf, HEADER_SIZE); |
15d35bc5 AL |
503 | if (ret < 0) |
504 | return ret; | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | /* | |
510 | * Allocates a new block. This involves writing a new footer and updating | |
511 | * the Block Allocation Table to use the space at the old end of the image | |
512 | * file (overwriting the old footer) | |
513 | * | |
514 | * Returns the sectors' offset in the image file on success and < 0 on error | |
515 | */ | |
516 | static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) | |
517 | { | |
518 | BDRVVPCState *s = bs->opaque; | |
519 | int64_t bat_offset; | |
520 | uint32_t index, bat_value; | |
521 | int ret; | |
522 | uint8_t bitmap[s->bitmap_size]; | |
523 | ||
9c057d0b | 524 | /* Check if sector_num is valid */ |
15d35bc5 AL |
525 | if ((sector_num < 0) || (sector_num > bs->total_sectors)) |
526 | return -1; | |
527 | ||
9c057d0b | 528 | /* Write entry into in-memory BAT */ |
15d35bc5 AL |
529 | index = (sector_num * 512) / s->block_size; |
530 | if (s->pagetable[index] != 0xFFFFFFFF) | |
531 | return -1; | |
532 | ||
533 | s->pagetable[index] = s->free_data_block_offset / 512; | |
534 | ||
9c057d0b | 535 | /* Initialize the block's bitmap */ |
15d35bc5 | 536 | memset(bitmap, 0xff, s->bitmap_size); |
9a4f4c31 | 537 | ret = bdrv_pwrite_sync(bs->file->bs, s->free_data_block_offset, bitmap, |
078a458e | 538 | s->bitmap_size); |
5bb1cbac KW |
539 | if (ret < 0) { |
540 | return ret; | |
541 | } | |
15d35bc5 | 542 | |
9c057d0b | 543 | /* Write new footer (the old one will be overwritten) */ |
15d35bc5 AL |
544 | s->free_data_block_offset += s->block_size + s->bitmap_size; |
545 | ret = rewrite_footer(bs); | |
546 | if (ret < 0) | |
547 | goto fail; | |
548 | ||
9c057d0b | 549 | /* Write BAT entry to disk */ |
15d35bc5 | 550 | bat_offset = s->bat_offset + (4 * index); |
a4127c42 | 551 | bat_value = cpu_to_be32(s->pagetable[index]); |
9a4f4c31 | 552 | ret = bdrv_pwrite_sync(bs->file->bs, bat_offset, &bat_value, 4); |
15d35bc5 AL |
553 | if (ret < 0) |
554 | goto fail; | |
555 | ||
556 | return get_sector_offset(bs, sector_num, 0); | |
557 | ||
558 | fail: | |
559 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
560 | return -1; | |
561 | } | |
562 | ||
97b00e28 PB |
563 | static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
564 | { | |
565 | BDRVVPCState *s = (BDRVVPCState *)bs->opaque; | |
566 | VHDFooter *footer = (VHDFooter *) s->footer_buf; | |
567 | ||
0d4cc3e7 | 568 | if (be32_to_cpu(footer->type) != VHD_FIXED) { |
97b00e28 PB |
569 | bdi->cluster_size = s->block_size; |
570 | } | |
571 | ||
95de6d70 | 572 | bdi->unallocated_blocks_are_zero = true; |
97b00e28 PB |
573 | return 0; |
574 | } | |
575 | ||
5fafdf24 | 576 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
6a0f9e82 FB |
577 | uint8_t *buf, int nb_sectors) |
578 | { | |
6c6ea921 | 579 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 580 | int ret; |
b71d1c2e | 581 | int64_t offset; |
6c6ea921 | 582 | int64_t sectors, sectors_per_block; |
e54835c0 | 583 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
6a0f9e82 | 584 | |
0d4cc3e7 | 585 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
9a4f4c31 | 586 | return bdrv_read(bs->file->bs, sector_num, buf, nb_sectors); |
24da78db | 587 | } |
6a0f9e82 | 588 | while (nb_sectors > 0) { |
15d35bc5 | 589 | offset = get_sector_offset(bs, sector_num, 0); |
b71d1c2e | 590 | |
6c6ea921 KW |
591 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
592 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
593 | if (sectors > nb_sectors) { | |
594 | sectors = nb_sectors; | |
595 | } | |
596 | ||
b71d1c2e | 597 | if (offset == -1) { |
6c6ea921 | 598 | memset(buf, 0, sectors * BDRV_SECTOR_SIZE); |
b71d1c2e | 599 | } else { |
9a4f4c31 | 600 | ret = bdrv_pread(bs->file->bs, offset, buf, |
6c6ea921 KW |
601 | sectors * BDRV_SECTOR_SIZE); |
602 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
b71d1c2e | 603 | return -1; |
6c6ea921 | 604 | } |
b71d1c2e AL |
605 | } |
606 | ||
6c6ea921 KW |
607 | nb_sectors -= sectors; |
608 | sector_num += sectors; | |
609 | buf += sectors * BDRV_SECTOR_SIZE; | |
6a0f9e82 FB |
610 | } |
611 | return 0; | |
612 | } | |
613 | ||
2914caa0 PB |
614 | static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, |
615 | uint8_t *buf, int nb_sectors) | |
616 | { | |
617 | int ret; | |
618 | BDRVVPCState *s = bs->opaque; | |
619 | qemu_co_mutex_lock(&s->lock); | |
620 | ret = vpc_read(bs, sector_num, buf, nb_sectors); | |
621 | qemu_co_mutex_unlock(&s->lock); | |
622 | return ret; | |
623 | } | |
624 | ||
15d35bc5 AL |
625 | static int vpc_write(BlockDriverState *bs, int64_t sector_num, |
626 | const uint8_t *buf, int nb_sectors) | |
627 | { | |
6c6ea921 | 628 | BDRVVPCState *s = bs->opaque; |
15d35bc5 | 629 | int64_t offset; |
6c6ea921 | 630 | int64_t sectors, sectors_per_block; |
15d35bc5 | 631 | int ret; |
e54835c0 | 632 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
15d35bc5 | 633 | |
0d4cc3e7 | 634 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
9a4f4c31 | 635 | return bdrv_write(bs->file->bs, sector_num, buf, nb_sectors); |
24da78db | 636 | } |
15d35bc5 AL |
637 | while (nb_sectors > 0) { |
638 | offset = get_sector_offset(bs, sector_num, 1); | |
639 | ||
6c6ea921 KW |
640 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
641 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
642 | if (sectors > nb_sectors) { | |
643 | sectors = nb_sectors; | |
644 | } | |
645 | ||
15d35bc5 AL |
646 | if (offset == -1) { |
647 | offset = alloc_block(bs, sector_num); | |
648 | if (offset < 0) | |
649 | return -1; | |
650 | } | |
651 | ||
9a4f4c31 KW |
652 | ret = bdrv_pwrite(bs->file->bs, offset, buf, |
653 | sectors * BDRV_SECTOR_SIZE); | |
6c6ea921 | 654 | if (ret != sectors * BDRV_SECTOR_SIZE) { |
15d35bc5 | 655 | return -1; |
6c6ea921 | 656 | } |
15d35bc5 | 657 | |
6c6ea921 KW |
658 | nb_sectors -= sectors; |
659 | sector_num += sectors; | |
660 | buf += sectors * BDRV_SECTOR_SIZE; | |
15d35bc5 AL |
661 | } |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
e183ef75 PB |
666 | static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, |
667 | const uint8_t *buf, int nb_sectors) | |
668 | { | |
669 | int ret; | |
670 | BDRVVPCState *s = bs->opaque; | |
671 | qemu_co_mutex_lock(&s->lock); | |
672 | ret = vpc_write(bs, sector_num, buf, nb_sectors); | |
673 | qemu_co_mutex_unlock(&s->lock); | |
674 | return ret; | |
675 | } | |
676 | ||
0cc84887 | 677 | static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs, |
67a0fd2a | 678 | int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) |
0cc84887 KW |
679 | { |
680 | BDRVVPCState *s = bs->opaque; | |
681 | VHDFooter *footer = (VHDFooter*) s->footer_buf; | |
2ec711dc | 682 | int64_t start, offset; |
0cc84887 KW |
683 | bool allocated; |
684 | int n; | |
685 | ||
686 | if (be32_to_cpu(footer->type) == VHD_FIXED) { | |
687 | *pnum = nb_sectors; | |
7429e207 | 688 | *file = bs->file->bs; |
0cc84887 KW |
689 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | |
690 | (sector_num << BDRV_SECTOR_BITS); | |
691 | } | |
692 | ||
693 | offset = get_sector_offset(bs, sector_num, 0); | |
694 | start = offset; | |
695 | allocated = (offset != -1); | |
696 | *pnum = 0; | |
697 | ||
698 | do { | |
699 | /* All sectors in a block are contiguous (without using the bitmap) */ | |
700 | n = ROUND_UP(sector_num + 1, s->block_size / BDRV_SECTOR_SIZE) | |
701 | - sector_num; | |
702 | n = MIN(n, nb_sectors); | |
703 | ||
704 | *pnum += n; | |
705 | sector_num += n; | |
706 | nb_sectors -= n; | |
2ec711dc PL |
707 | /* *pnum can't be greater than one block for allocated |
708 | * sectors since there is always a bitmap in between. */ | |
709 | if (allocated) { | |
7429e207 | 710 | *file = bs->file->bs; |
2ec711dc PL |
711 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start; |
712 | } | |
0cc84887 KW |
713 | if (nb_sectors == 0) { |
714 | break; | |
715 | } | |
0cc84887 | 716 | offset = get_sector_offset(bs, sector_num, 0); |
2ec711dc | 717 | } while (offset == -1); |
0cc84887 | 718 | |
2ec711dc | 719 | return 0; |
0cc84887 KW |
720 | } |
721 | ||
57c7d9e5 AL |
722 | /* |
723 | * Calculates the number of cylinders, heads and sectors per cylinder | |
724 | * based on a given number of sectors. This is the algorithm described | |
725 | * in the VHD specification. | |
726 | * | |
727 | * Note that the geometry doesn't always exactly match total_sectors but | |
728 | * may round it down. | |
6e9ea0c0 | 729 | * |
c23fb11b | 730 | * Returns 0 on success, -EFBIG if the size is larger than 2040 GiB. Override |
258d2edb CA |
731 | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) |
732 | * and instead allow up to 255 heads. | |
57c7d9e5 | 733 | */ |
6e9ea0c0 | 734 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
57c7d9e5 AL |
735 | uint8_t* heads, uint8_t* secs_per_cyl) |
736 | { | |
737 | uint32_t cyls_times_heads; | |
738 | ||
690cbb09 | 739 | total_sectors = MIN(total_sectors, VHD_MAX_GEOMETRY); |
57c7d9e5 | 740 | |
690cbb09 | 741 | if (total_sectors >= 65535LL * 16 * 63) { |
57c7d9e5 | 742 | *secs_per_cyl = 255; |
690cbb09 | 743 | *heads = 16; |
57c7d9e5 AL |
744 | cyls_times_heads = total_sectors / *secs_per_cyl; |
745 | } else { | |
746 | *secs_per_cyl = 17; | |
747 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
748 | *heads = (cyls_times_heads + 1023) / 1024; | |
749 | ||
690cbb09 | 750 | if (*heads < 4) { |
57c7d9e5 | 751 | *heads = 4; |
690cbb09 | 752 | } |
57c7d9e5 AL |
753 | |
754 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
755 | *secs_per_cyl = 31; | |
756 | *heads = 16; | |
757 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
758 | } | |
759 | ||
760 | if (cyls_times_heads >= (*heads * 1024)) { | |
761 | *secs_per_cyl = 63; | |
762 | *heads = 16; | |
763 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
764 | } | |
765 | } | |
766 | ||
dede4188 | 767 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
768 | |
769 | return 0; | |
57c7d9e5 AL |
770 | } |
771 | ||
b8f45cdf | 772 | static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, |
fef6070e | 773 | int64_t total_sectors) |
57c7d9e5 | 774 | { |
e54835c0 JC |
775 | VHDDynDiskHeader *dyndisk_header = |
776 | (VHDDynDiskHeader *) buf; | |
57c7d9e5 | 777 | size_t block_size, num_bat_entries; |
24da78db | 778 | int i; |
fef6070e JC |
779 | int ret; |
780 | int64_t offset = 0; | |
57c7d9e5 | 781 | |
9c057d0b | 782 | /* Write the footer (twice: at the beginning and at the end) */ |
57c7d9e5 AL |
783 | block_size = 0x200000; |
784 | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); | |
785 | ||
b8f45cdf | 786 | ret = blk_pwrite(blk, offset, buf, HEADER_SIZE); |
40a99aac | 787 | if (ret < 0) { |
f0ff243a BS |
788 | goto fail; |
789 | } | |
57c7d9e5 | 790 | |
fef6070e | 791 | offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); |
b8f45cdf | 792 | ret = blk_pwrite(blk, offset, buf, HEADER_SIZE); |
fef6070e | 793 | if (ret < 0) { |
f0ff243a BS |
794 | goto fail; |
795 | } | |
57c7d9e5 | 796 | |
9c057d0b | 797 | /* Write the initial BAT */ |
fef6070e | 798 | offset = 3 * 512; |
57c7d9e5 AL |
799 | |
800 | memset(buf, 0xFF, 512); | |
f0ff243a | 801 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
b8f45cdf | 802 | ret = blk_pwrite(blk, offset, buf, 512); |
fef6070e | 803 | if (ret < 0) { |
f0ff243a BS |
804 | goto fail; |
805 | } | |
fef6070e | 806 | offset += 512; |
f0ff243a | 807 | } |
57c7d9e5 | 808 | |
9c057d0b | 809 | /* Prepare the Dynamic Disk Header */ |
57c7d9e5 AL |
810 | memset(buf, 0, 1024); |
811 | ||
5ec4d682 | 812 | memcpy(dyndisk_header->magic, "cxsparse", 8); |
57c7d9e5 | 813 | |
78439f6a CA |
814 | /* |
815 | * Note: The spec is actually wrong here for data_offset, it says | |
816 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. | |
817 | */ | |
a4127c42 SH |
818 | dyndisk_header->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
819 | dyndisk_header->table_offset = cpu_to_be64(3 * 512); | |
820 | dyndisk_header->version = cpu_to_be32(0x00010000); | |
821 | dyndisk_header->block_size = cpu_to_be32(block_size); | |
822 | dyndisk_header->max_table_entries = cpu_to_be32(num_bat_entries); | |
57c7d9e5 | 823 | |
a4127c42 | 824 | dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024)); |
57c7d9e5 | 825 | |
9c057d0b | 826 | /* Write the header */ |
fef6070e | 827 | offset = 512; |
57c7d9e5 | 828 | |
b8f45cdf | 829 | ret = blk_pwrite(blk, offset, buf, 1024); |
fef6070e | 830 | if (ret < 0) { |
f0ff243a BS |
831 | goto fail; |
832 | } | |
f0ff243a | 833 | |
24da78db CA |
834 | fail: |
835 | return ret; | |
836 | } | |
837 | ||
b8f45cdf | 838 | static int create_fixed_disk(BlockBackend *blk, uint8_t *buf, |
fef6070e | 839 | int64_t total_size) |
24da78db | 840 | { |
fef6070e | 841 | int ret; |
24da78db CA |
842 | |
843 | /* Add footer to total size */ | |
fef6070e JC |
844 | total_size += HEADER_SIZE; |
845 | ||
b8f45cdf | 846 | ret = blk_truncate(blk, total_size); |
fef6070e JC |
847 | if (ret < 0) { |
848 | return ret; | |
24da78db CA |
849 | } |
850 | ||
b8f45cdf | 851 | ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE); |
fef6070e JC |
852 | if (ret < 0) { |
853 | return ret; | |
854 | } | |
24da78db | 855 | |
24da78db CA |
856 | return ret; |
857 | } | |
858 | ||
fec9921f | 859 | static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) |
24da78db CA |
860 | { |
861 | uint8_t buf[1024]; | |
e54835c0 | 862 | VHDFooter *footer = (VHDFooter *) buf; |
fec9921f | 863 | char *disk_type_param; |
fef6070e | 864 | int i; |
24da78db CA |
865 | uint16_t cyls = 0; |
866 | uint8_t heads = 0; | |
867 | uint8_t secs_per_cyl = 0; | |
868 | int64_t total_sectors; | |
869 | int64_t total_size; | |
870 | int disk_type; | |
871 | int ret = -EIO; | |
fb9245c2 | 872 | bool force_size; |
fef6070e | 873 | Error *local_err = NULL; |
b8f45cdf | 874 | BlockBackend *blk = NULL; |
24da78db CA |
875 | |
876 | /* Read out options */ | |
c2eb918e HT |
877 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
878 | BDRV_SECTOR_SIZE); | |
fec9921f CL |
879 | disk_type_param = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); |
880 | if (disk_type_param) { | |
881 | if (!strcmp(disk_type_param, "dynamic")) { | |
24da78db | 882 | disk_type = VHD_DYNAMIC; |
fec9921f | 883 | } else if (!strcmp(disk_type_param, "fixed")) { |
24da78db CA |
884 | disk_type = VHD_FIXED; |
885 | } else { | |
0211b9be | 886 | error_setg(errp, "Invalid disk type, %s", disk_type_param); |
fec9921f CL |
887 | ret = -EINVAL; |
888 | goto out; | |
24da78db CA |
889 | } |
890 | } else { | |
891 | disk_type = VHD_DYNAMIC; | |
892 | } | |
893 | ||
fb9245c2 JC |
894 | force_size = qemu_opt_get_bool_del(opts, VPC_OPT_FORCE_SIZE, false); |
895 | ||
fef6070e JC |
896 | ret = bdrv_create_file(filename, opts, &local_err); |
897 | if (ret < 0) { | |
898 | error_propagate(errp, local_err); | |
fec9921f | 899 | goto out; |
24da78db | 900 | } |
b8f45cdf | 901 | |
efaa7c4e | 902 | blk = blk_new_open(filename, NULL, NULL, |
72e775c7 | 903 | BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); |
b8f45cdf | 904 | if (blk == NULL) { |
fef6070e | 905 | error_propagate(errp, local_err); |
b8f45cdf | 906 | ret = -EIO; |
fef6070e | 907 | goto out; |
4ab15590 CL |
908 | } |
909 | ||
b8f45cdf KW |
910 | blk_set_allow_write_beyond_eof(blk, true); |
911 | ||
ecd880d9 KW |
912 | /* |
913 | * Calculate matching total_size and geometry. Increase the number of | |
914 | * sectors requested until we get enough (or fail). This ensures that | |
915 | * qemu-img convert doesn't truncate images, but rather rounds up. | |
690cbb09 | 916 | * |
fb9245c2 | 917 | * If the image size can't be represented by a spec conformant CHS geometry, |
690cbb09 PL |
918 | * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use |
919 | * the image size from the VHD footer to calculate total_sectors. | |
ecd880d9 | 920 | */ |
fb9245c2 JC |
921 | if (force_size) { |
922 | /* This will force the use of total_size for sector count, below */ | |
923 | cyls = VHD_CHS_MAX_C; | |
924 | heads = VHD_CHS_MAX_H; | |
925 | secs_per_cyl = VHD_CHS_MAX_S; | |
926 | } else { | |
927 | total_sectors = MIN(VHD_MAX_GEOMETRY, total_size / BDRV_SECTOR_SIZE); | |
928 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { | |
929 | calculate_geometry(total_sectors + i, &cyls, &heads, &secs_per_cyl); | |
930 | } | |
690cbb09 PL |
931 | } |
932 | ||
933 | if ((int64_t)cyls * heads * secs_per_cyl == VHD_MAX_GEOMETRY) { | |
934 | total_sectors = total_size / BDRV_SECTOR_SIZE; | |
c23fb11b | 935 | /* Allow a maximum disk size of 2040 GiB */ |
690cbb09 | 936 | if (total_sectors > VHD_MAX_SECTORS) { |
0211b9be | 937 | error_setg(errp, "Disk size is too large, max size is 2040 GiB"); |
24da78db | 938 | ret = -EFBIG; |
fef6070e | 939 | goto out; |
24da78db | 940 | } |
690cbb09 PL |
941 | } else { |
942 | total_sectors = (int64_t)cyls * heads * secs_per_cyl; | |
943 | total_size = total_sectors * BDRV_SECTOR_SIZE; | |
24da78db | 944 | } |
ecd880d9 | 945 | |
24da78db CA |
946 | /* Prepare the Hard Disk Footer */ |
947 | memset(buf, 0, 1024); | |
948 | ||
949 | memcpy(footer->creator, "conectix", 8); | |
fb9245c2 JC |
950 | if (force_size) { |
951 | memcpy(footer->creator_app, "qem2", 4); | |
952 | } else { | |
953 | memcpy(footer->creator_app, "qemu", 4); | |
954 | } | |
24da78db CA |
955 | memcpy(footer->creator_os, "Wi2k", 4); |
956 | ||
a4127c42 SH |
957 | footer->features = cpu_to_be32(0x02); |
958 | footer->version = cpu_to_be32(0x00010000); | |
24da78db | 959 | if (disk_type == VHD_DYNAMIC) { |
a4127c42 | 960 | footer->data_offset = cpu_to_be64(HEADER_SIZE); |
24da78db | 961 | } else { |
a4127c42 | 962 | footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
24da78db | 963 | } |
a4127c42 | 964 | footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); |
24da78db CA |
965 | |
966 | /* Version of Virtual PC 2007 */ | |
a4127c42 SH |
967 | footer->major = cpu_to_be16(0x0005); |
968 | footer->minor = cpu_to_be16(0x0003); | |
3f3f20dc | 969 | footer->orig_size = cpu_to_be64(total_size); |
03671ded | 970 | footer->current_size = cpu_to_be64(total_size); |
a4127c42 | 971 | footer->cyls = cpu_to_be16(cyls); |
24da78db CA |
972 | footer->heads = heads; |
973 | footer->secs_per_cyl = secs_per_cyl; | |
974 | ||
a4127c42 | 975 | footer->type = cpu_to_be32(disk_type); |
24da78db | 976 | |
1fe1fa51 CA |
977 | #if defined(CONFIG_UUID) |
978 | uuid_generate(footer->uuid); | |
979 | #endif | |
24da78db | 980 | |
a4127c42 | 981 | footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE)); |
24da78db CA |
982 | |
983 | if (disk_type == VHD_DYNAMIC) { | |
b8f45cdf | 984 | ret = create_dynamic_disk(blk, buf, total_sectors); |
24da78db | 985 | } else { |
b8f45cdf | 986 | ret = create_fixed_disk(blk, buf, total_size); |
24da78db | 987 | } |
0211b9be JC |
988 | if (ret < 0) { |
989 | error_setg(errp, "Unable to create or write VHD header"); | |
990 | } | |
24da78db | 991 | |
fec9921f | 992 | out: |
b8f45cdf | 993 | blk_unref(blk); |
fec9921f | 994 | g_free(disk_type_param); |
f0ff243a | 995 | return ret; |
57c7d9e5 AL |
996 | } |
997 | ||
72c6cc94 KW |
998 | static int vpc_has_zero_init(BlockDriverState *bs) |
999 | { | |
1000 | BDRVVPCState *s = bs->opaque; | |
e54835c0 | 1001 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
72c6cc94 | 1002 | |
0d4cc3e7 | 1003 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
9a4f4c31 | 1004 | return bdrv_has_zero_init(bs->file->bs); |
72c6cc94 KW |
1005 | } else { |
1006 | return 1; | |
1007 | } | |
1008 | } | |
1009 | ||
6a0f9e82 FB |
1010 | static void vpc_close(BlockDriverState *bs) |
1011 | { | |
1012 | BDRVVPCState *s = bs->opaque; | |
97f1c45c | 1013 | qemu_vfree(s->pagetable); |
6a0f9e82 | 1014 | #ifdef CACHE |
7267c094 | 1015 | g_free(s->pageentry_u8); |
6a0f9e82 | 1016 | #endif |
612ff3d8 KW |
1017 | |
1018 | migrate_del_blocker(s->migration_blocker); | |
1019 | error_free(s->migration_blocker); | |
6a0f9e82 FB |
1020 | } |
1021 | ||
fec9921f CL |
1022 | static QemuOptsList vpc_create_opts = { |
1023 | .name = "vpc-create-opts", | |
1024 | .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head), | |
1025 | .desc = { | |
1026 | { | |
1027 | .name = BLOCK_OPT_SIZE, | |
1028 | .type = QEMU_OPT_SIZE, | |
1029 | .help = "Virtual disk size" | |
1030 | }, | |
1031 | { | |
1032 | .name = BLOCK_OPT_SUBFMT, | |
1033 | .type = QEMU_OPT_STRING, | |
1034 | .help = | |
1035 | "Type of virtual hard disk format. Supported formats are " | |
1036 | "{dynamic (default) | fixed} " | |
1037 | }, | |
fb9245c2 JC |
1038 | { |
1039 | .name = VPC_OPT_FORCE_SIZE, | |
1040 | .type = QEMU_OPT_BOOL, | |
1041 | .help = "Force disk size calculation to use the actual size " | |
1042 | "specified, rather than using the nearest CHS-based " | |
1043 | "calculation" | |
1044 | }, | |
fec9921f CL |
1045 | { /* end of list */ } |
1046 | } | |
0e7e1989 KW |
1047 | }; |
1048 | ||
5efa9d5a | 1049 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
1050 | .format_name = "vpc", |
1051 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 1052 | |
72c6cc94 KW |
1053 | .bdrv_probe = vpc_probe, |
1054 | .bdrv_open = vpc_open, | |
1055 | .bdrv_close = vpc_close, | |
1056 | .bdrv_reopen_prepare = vpc_reopen_prepare, | |
c282e1fd | 1057 | .bdrv_create = vpc_create, |
0e7e1989 | 1058 | |
0cc84887 KW |
1059 | .bdrv_read = vpc_co_read, |
1060 | .bdrv_write = vpc_co_write, | |
1061 | .bdrv_co_get_block_status = vpc_co_get_block_status, | |
c68b89ac | 1062 | |
97b00e28 PB |
1063 | .bdrv_get_info = vpc_get_info, |
1064 | ||
fec9921f | 1065 | .create_opts = &vpc_create_opts, |
72c6cc94 | 1066 | .bdrv_has_zero_init = vpc_has_zero_init, |
6a0f9e82 | 1067 | }; |
5efa9d5a AL |
1068 | |
1069 | static void bdrv_vpc_init(void) | |
1070 | { | |
1071 | bdrv_register(&bdrv_vpc); | |
1072 | } | |
1073 | ||
1074 | block_init(bdrv_vpc_init); |