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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" |
58369e22 | 32 | #include "qemu/bswap.h" |
38440a21 | 33 | #include "qemu/uuid.h" |
6a0f9e82 FB |
34 | |
35 | /**************************************************************/ | |
36 | ||
37 | #define HEADER_SIZE 512 | |
38 | ||
39 | //#define CACHE | |
40 | ||
2cfacb62 AL |
41 | enum vhd_type { |
42 | VHD_FIXED = 2, | |
43 | VHD_DYNAMIC = 3, | |
44 | VHD_DIFFERENCING = 4, | |
45 | }; | |
46 | ||
9c057d0b | 47 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
57c7d9e5 AL |
48 | #define VHD_TIMESTAMP_BASE 946684800 |
49 | ||
fb9245c2 JC |
50 | #define VHD_CHS_MAX_C 65535LL |
51 | #define VHD_CHS_MAX_H 16 | |
52 | #define VHD_CHS_MAX_S 255 | |
53 | ||
c23fb11b | 54 | #define VHD_MAX_SECTORS 0xff000000 /* 2040 GiB max image size */ |
fb9245c2 JC |
55 | #define VHD_MAX_GEOMETRY (VHD_CHS_MAX_C * VHD_CHS_MAX_H * VHD_CHS_MAX_S) |
56 | ||
57 | #define VPC_OPT_FORCE_SIZE "force_size" | |
97f1c45c | 58 | |
9c057d0b | 59 | /* always big-endian */ |
e54835c0 | 60 | typedef struct vhd_footer { |
9c057d0b | 61 | char creator[8]; /* "conectix" */ |
2cfacb62 AL |
62 | uint32_t features; |
63 | uint32_t version; | |
64 | ||
9c057d0b | 65 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
2cfacb62 AL |
66 | uint64_t data_offset; |
67 | ||
9c057d0b | 68 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
2cfacb62 AL |
69 | uint32_t timestamp; |
70 | ||
9c057d0b | 71 | char creator_app[4]; /* e.g., "vpc " */ |
2cfacb62 AL |
72 | uint16_t major; |
73 | uint16_t minor; | |
9c057d0b | 74 | char creator_os[4]; /* "Wi2k" */ |
2cfacb62 AL |
75 | |
76 | uint64_t orig_size; | |
03671ded | 77 | uint64_t current_size; |
2cfacb62 AL |
78 | |
79 | uint16_t cyls; | |
80 | uint8_t heads; | |
81 | uint8_t secs_per_cyl; | |
82 | ||
83 | uint32_t type; | |
84 | ||
9c057d0b JC |
85 | /* Checksum of the Hard Disk Footer ("one's complement of the sum of all |
86 | the bytes in the footer without the checksum field") */ | |
2cfacb62 AL |
87 | uint32_t checksum; |
88 | ||
9c057d0b | 89 | /* UUID used to identify a parent hard disk (backing file) */ |
38440a21 | 90 | QemuUUID uuid; |
2cfacb62 AL |
91 | |
92 | uint8_t in_saved_state; | |
e54835c0 | 93 | } QEMU_PACKED VHDFooter; |
b9fa33a6 | 94 | |
e54835c0 | 95 | typedef struct vhd_dyndisk_header { |
9c057d0b | 96 | char magic[8]; /* "cxsparse" */ |
2cfacb62 | 97 | |
9c057d0b | 98 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
2cfacb62 AL |
99 | uint64_t data_offset; |
100 | ||
9c057d0b | 101 | /* Offset of the Block Allocation Table (BAT) */ |
2cfacb62 AL |
102 | uint64_t table_offset; |
103 | ||
104 | uint32_t version; | |
9c057d0b | 105 | uint32_t max_table_entries; /* 32bit/entry */ |
2cfacb62 | 106 | |
9c057d0b | 107 | /* 2 MB by default, must be a power of two */ |
2cfacb62 AL |
108 | uint32_t block_size; |
109 | ||
110 | uint32_t checksum; | |
111 | uint8_t parent_uuid[16]; | |
112 | uint32_t parent_timestamp; | |
113 | uint32_t reserved; | |
114 | ||
9c057d0b | 115 | /* Backing file name (in UTF-16) */ |
2cfacb62 AL |
116 | uint8_t parent_name[512]; |
117 | ||
118 | struct { | |
119 | uint32_t platform; | |
120 | uint32_t data_space; | |
121 | uint32_t data_length; | |
122 | uint32_t reserved; | |
123 | uint64_t data_offset; | |
124 | } parent_locator[8]; | |
e54835c0 | 125 | } QEMU_PACKED VHDDynDiskHeader; |
6a0f9e82 FB |
126 | |
127 | typedef struct BDRVVPCState { | |
848c66e8 | 128 | CoMutex lock; |
15d35bc5 AL |
129 | uint8_t footer_buf[HEADER_SIZE]; |
130 | uint64_t free_data_block_offset; | |
2cfacb62 | 131 | int max_table_entries; |
6a0f9e82 | 132 | uint32_t *pagetable; |
15d35bc5 AL |
133 | uint64_t bat_offset; |
134 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 135 | |
2cfacb62 | 136 | uint32_t block_size; |
15d35bc5 | 137 | uint32_t bitmap_size; |
c540d53a JC |
138 | bool force_use_chs; |
139 | bool force_use_sz; | |
15d35bc5 | 140 | |
6a0f9e82 FB |
141 | #ifdef CACHE |
142 | uint8_t *pageentry_u8; | |
143 | uint32_t *pageentry_u32; | |
144 | uint16_t *pageentry_u16; | |
3b46e624 | 145 | |
6a0f9e82 FB |
146 | uint64_t last_bitmap; |
147 | #endif | |
612ff3d8 KW |
148 | |
149 | Error *migration_blocker; | |
6a0f9e82 FB |
150 | } BDRVVPCState; |
151 | ||
c540d53a JC |
152 | #define VPC_OPT_SIZE_CALC "force_size_calc" |
153 | static QemuOptsList vpc_runtime_opts = { | |
154 | .name = "vpc-runtime-opts", | |
155 | .head = QTAILQ_HEAD_INITIALIZER(vpc_runtime_opts.head), | |
156 | .desc = { | |
157 | { | |
158 | .name = VPC_OPT_SIZE_CALC, | |
159 | .type = QEMU_OPT_STRING, | |
160 | .help = "Force disk size calculation to use either CHS geometry, " | |
161 | "or use the disk current_size specified in the VHD footer. " | |
162 | "{chs, current_size}" | |
163 | }, | |
164 | { /* end of list */ } | |
165 | } | |
166 | }; | |
167 | ||
57c7d9e5 AL |
168 | static uint32_t vpc_checksum(uint8_t* buf, size_t size) |
169 | { | |
170 | uint32_t res = 0; | |
171 | int i; | |
172 | ||
173 | for (i = 0; i < size; i++) | |
174 | res += buf[i]; | |
175 | ||
176 | return ~res; | |
177 | } | |
178 | ||
179 | ||
6a0f9e82 FB |
180 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
181 | { | |
ffe8ab83 | 182 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
6a0f9e82 | 183 | return 100; |
6a0f9e82 FB |
184 | return 0; |
185 | } | |
186 | ||
c540d53a JC |
187 | static void vpc_parse_options(BlockDriverState *bs, QemuOpts *opts, |
188 | Error **errp) | |
189 | { | |
190 | BDRVVPCState *s = bs->opaque; | |
191 | const char *size_calc; | |
192 | ||
193 | size_calc = qemu_opt_get(opts, VPC_OPT_SIZE_CALC); | |
194 | ||
195 | if (!size_calc) { | |
196 | /* no override, use autodetect only */ | |
197 | } else if (!strcmp(size_calc, "current_size")) { | |
198 | s->force_use_sz = true; | |
199 | } else if (!strcmp(size_calc, "chs")) { | |
200 | s->force_use_chs = true; | |
201 | } else { | |
202 | error_setg(errp, "Invalid size calculation mode: '%s'", size_calc); | |
203 | } | |
204 | } | |
205 | ||
015a1036 HR |
206 | static int vpc_open(BlockDriverState *bs, QDict *options, int flags, |
207 | Error **errp) | |
6a0f9e82 FB |
208 | { |
209 | BDRVVPCState *s = bs->opaque; | |
66f82cee | 210 | int i; |
e54835c0 JC |
211 | VHDFooter *footer; |
212 | VHDDynDiskHeader *dyndisk_header; | |
c540d53a JC |
213 | QemuOpts *opts = NULL; |
214 | Error *local_err = NULL; | |
215 | bool use_chs; | |
b9fa33a6 | 216 | uint8_t buf[HEADER_SIZE]; |
57c7d9e5 | 217 | uint32_t checksum; |
97f1c45c | 218 | uint64_t computed_size; |
b15deac7 | 219 | uint64_t pagetable_size; |
24da78db | 220 | int disk_type = VHD_DYNAMIC; |
59294e46 | 221 | int ret; |
6a0f9e82 | 222 | |
c540d53a JC |
223 | opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort); |
224 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
225 | if (local_err) { | |
226 | error_propagate(errp, local_err); | |
227 | ret = -EINVAL; | |
228 | goto fail; | |
229 | } | |
230 | ||
231 | vpc_parse_options(bs, opts, &local_err); | |
232 | if (local_err) { | |
233 | error_propagate(errp, local_err); | |
234 | ret = -EINVAL; | |
235 | goto fail; | |
236 | } | |
237 | ||
cf2ab8fc | 238 | ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE); |
59294e46 | 239 | if (ret < 0) { |
32f6439c | 240 | error_setg(errp, "Unable to read VHD header"); |
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; | |
32f6439c | 249 | error_setg(errp, "Invalid file size"); |
59294e46 KW |
250 | goto fail; |
251 | } else if (offset < HEADER_SIZE) { | |
252 | ret = -EINVAL; | |
32f6439c | 253 | error_setg(errp, "File too small for a VHD header"); |
24da78db CA |
254 | goto fail; |
255 | } | |
59294e46 | 256 | |
24da78db | 257 | /* If a fixed disk, the footer is found only at the end of the file */ |
cf2ab8fc | 258 | ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, |
59294e46 KW |
259 | HEADER_SIZE); |
260 | if (ret < 0) { | |
24da78db CA |
261 | goto fail; |
262 | } | |
263 | if (strncmp(footer->creator, "conectix", 8)) { | |
76abe407 PB |
264 | error_setg(errp, "invalid VPC image"); |
265 | ret = -EINVAL; | |
24da78db CA |
266 | goto fail; |
267 | } | |
268 | disk_type = VHD_FIXED; | |
269 | } | |
6a0f9e82 | 270 | |
57c7d9e5 AL |
271 | checksum = be32_to_cpu(footer->checksum); |
272 | footer->checksum = 0; | |
273 | if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) | |
274 | fprintf(stderr, "block-vpc: The header checksum of '%s' is " | |
66f82cee | 275 | "incorrect.\n", bs->filename); |
57c7d9e5 | 276 | |
c088b691 | 277 | /* Write 'checksum' back to footer, or else will leave it with zero. */ |
a4127c42 | 278 | footer->checksum = cpu_to_be32(checksum); |
c088b691 | 279 | |
9c057d0b JC |
280 | /* The visible size of a image in Virtual PC depends on the geometry |
281 | rather than on the size stored in the footer (the size in the footer | |
282 | is too large usually) */ | |
33ccf667 SH |
283 | bs->total_sectors = (int64_t) |
284 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; | |
1fa79228 | 285 | |
c540d53a JC |
286 | /* Microsoft Virtual PC and Microsoft Hyper-V produce and read |
287 | * VHD image sizes differently. VPC will rely on CHS geometry, | |
288 | * while Hyper-V and disk2vhd use the size specified in the footer. | |
289 | * | |
290 | * We use a couple of approaches to try and determine the correct method: | |
291 | * look at the Creator App field, and look for images that have CHS | |
292 | * geometry that is the maximum value. | |
293 | * | |
294 | * If the CHS geometry is the maximum CHS geometry, then we assume that | |
295 | * the size is the footer->current_size to avoid truncation. Otherwise, | |
296 | * we follow the table based on footer->creator_app: | |
297 | * | |
298 | * Known creator apps: | |
299 | * 'vpc ' : CHS Virtual PC (uses disk geometry) | |
300 | * 'qemu' : CHS QEMU (uses disk geometry) | |
fb9245c2 | 301 | * 'qem2' : current_size QEMU (uses current_size) |
c540d53a JC |
302 | * 'win ' : current_size Hyper-V |
303 | * 'd2v ' : current_size Disk2vhd | |
9bdfb9e8 | 304 | * 'tap\0' : current_size XenServer |
bab246db | 305 | * 'CTXS' : current_size XenConverter |
c540d53a JC |
306 | * |
307 | * The user can override the table values via drive options, however | |
308 | * even with an override we will still use current_size for images | |
309 | * that have CHS geometry of the maximum size. | |
310 | */ | |
311 | use_chs = (!!strncmp(footer->creator_app, "win ", 4) && | |
fb9245c2 | 312 | !!strncmp(footer->creator_app, "qem2", 4) && |
9bdfb9e8 | 313 | !!strncmp(footer->creator_app, "d2v ", 4) && |
bab246db | 314 | !!strncmp(footer->creator_app, "CTXS", 4) && |
9bdfb9e8 | 315 | !!memcmp(footer->creator_app, "tap", 4)) || s->force_use_chs; |
c540d53a JC |
316 | |
317 | if (!use_chs || bs->total_sectors == VHD_MAX_GEOMETRY || s->force_use_sz) { | |
03671ded | 318 | bs->total_sectors = be64_to_cpu(footer->current_size) / |
c540d53a | 319 | BDRV_SECTOR_SIZE; |
0173e7bb PL |
320 | } |
321 | ||
c23fb11b JC |
322 | /* Allow a maximum disk size of 2040 GiB */ |
323 | if (bs->total_sectors > VHD_MAX_SECTORS) { | |
59294e46 | 324 | ret = -EFBIG; |
efc8243d SH |
325 | goto fail; |
326 | } | |
327 | ||
24da78db | 328 | if (disk_type == VHD_DYNAMIC) { |
cf2ab8fc | 329 | ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, |
59294e46 KW |
330 | HEADER_SIZE); |
331 | if (ret < 0) { | |
32f6439c | 332 | error_setg(errp, "Error reading dynamic VHD header"); |
24da78db CA |
333 | goto fail; |
334 | } | |
b9fa33a6 | 335 | |
e54835c0 | 336 | dyndisk_header = (VHDDynDiskHeader *) buf; |
6a0f9e82 | 337 | |
24da78db | 338 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { |
32f6439c | 339 | error_setg(errp, "Invalid header magic"); |
59294e46 | 340 | ret = -EINVAL; |
24da78db CA |
341 | goto fail; |
342 | } | |
6a0f9e82 | 343 | |
24da78db | 344 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
5e71dfad KW |
345 | if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { |
346 | error_setg(errp, "Invalid block size %" PRIu32, s->block_size); | |
347 | ret = -EINVAL; | |
348 | goto fail; | |
349 | } | |
24da78db | 350 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; |
15d35bc5 | 351 | |
24da78db | 352 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
97f1c45c JC |
353 | |
354 | if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { | |
32f6439c | 355 | error_setg(errp, "Too many blocks"); |
97f1c45c JC |
356 | ret = -EINVAL; |
357 | goto fail; | |
358 | } | |
97f1c45c JC |
359 | |
360 | computed_size = (uint64_t) s->max_table_entries * s->block_size; | |
361 | if (computed_size < bs->total_sectors * 512) { | |
32f6439c | 362 | error_setg(errp, "Page table too small"); |
97f1c45c JC |
363 | ret = -EINVAL; |
364 | goto fail; | |
365 | } | |
366 | ||
b15deac7 JC |
367 | if (s->max_table_entries > SIZE_MAX / 4 || |
368 | s->max_table_entries > (int) INT_MAX / 4) { | |
369 | error_setg(errp, "Max Table Entries too large (%" PRId32 ")", | |
370 | s->max_table_entries); | |
371 | ret = -EINVAL; | |
372 | goto fail; | |
373 | } | |
374 | ||
375 | pagetable_size = (uint64_t) s->max_table_entries * 4; | |
376 | ||
9a4f4c31 | 377 | s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size); |
5fb09cd5 | 378 | if (s->pagetable == NULL) { |
32f6439c | 379 | error_setg(errp, "Unable to allocate memory for page table"); |
5fb09cd5 KW |
380 | ret = -ENOMEM; |
381 | goto fail; | |
382 | } | |
b71d1c2e | 383 | |
24da78db | 384 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
59294e46 | 385 | |
cf2ab8fc | 386 | ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable, |
9a4f4c31 | 387 | pagetable_size); |
59294e46 | 388 | if (ret < 0) { |
32f6439c | 389 | error_setg(errp, "Error reading pagetable"); |
24da78db CA |
390 | goto fail; |
391 | } | |
b71d1c2e | 392 | |
24da78db | 393 | s->free_data_block_offset = |
b15deac7 | 394 | ROUND_UP(s->bat_offset + pagetable_size, 512); |
15d35bc5 | 395 | |
24da78db CA |
396 | for (i = 0; i < s->max_table_entries; i++) { |
397 | be32_to_cpus(&s->pagetable[i]); | |
398 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
399 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
400 | s->bitmap_size + s->block_size; | |
15d35bc5 | 401 | |
24da78db CA |
402 | if (next > s->free_data_block_offset) { |
403 | s->free_data_block_offset = next; | |
404 | } | |
405 | } | |
15d35bc5 | 406 | } |
15d35bc5 | 407 | |
9a4f4c31 | 408 | if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) { |
fb8fe35f PL |
409 | error_setg(errp, "block-vpc: free_data_block_offset points after " |
410 | "the end of file. The image has been truncated."); | |
411 | ret = -EINVAL; | |
412 | goto fail; | |
413 | } | |
414 | ||
24da78db | 415 | s->last_bitmap_offset = (int64_t) -1; |
6a0f9e82 | 416 | |
6a0f9e82 | 417 | #ifdef CACHE |
24da78db CA |
418 | s->pageentry_u8 = g_malloc(512); |
419 | s->pageentry_u32 = s->pageentry_u8; | |
420 | s->pageentry_u16 = s->pageentry_u8; | |
421 | s->last_pagetable = -1; | |
6a0f9e82 | 422 | #endif |
24da78db | 423 | } |
6a0f9e82 | 424 | |
612ff3d8 | 425 | /* Disable migration when VHD images are used */ |
81e5f78a AG |
426 | error_setg(&s->migration_blocker, "The vpc format used by node '%s' " |
427 | "does not support live migration", | |
428 | bdrv_get_device_or_node_name(bs)); | |
fe44dc91 AA |
429 | ret = migrate_add_blocker(s->migration_blocker, &local_err); |
430 | if (local_err) { | |
431 | error_propagate(errp, local_err); | |
432 | error_free(s->migration_blocker); | |
433 | goto fail; | |
434 | } | |
435 | ||
436 | qemu_co_mutex_init(&s->lock); | |
612ff3d8 | 437 | |
6a0f9e82 | 438 | return 0; |
59294e46 KW |
439 | |
440 | fail: | |
97f1c45c | 441 | qemu_vfree(s->pagetable); |
59294e46 KW |
442 | #ifdef CACHE |
443 | g_free(s->pageentry_u8); | |
444 | #endif | |
445 | return ret; | |
6a0f9e82 FB |
446 | } |
447 | ||
3fe4b700 JC |
448 | static int vpc_reopen_prepare(BDRVReopenState *state, |
449 | BlockReopenQueue *queue, Error **errp) | |
450 | { | |
451 | return 0; | |
452 | } | |
453 | ||
b71d1c2e AL |
454 | /* |
455 | * Returns the absolute byte offset of the given sector in the image file. | |
456 | * If the sector is not allocated, -1 is returned instead. | |
15d35bc5 AL |
457 | * |
458 | * The parameter write must be 1 if the offset will be used for a write | |
459 | * operation (the block bitmaps is updated then), 0 otherwise. | |
b71d1c2e | 460 | */ |
d46b7cc6 KW |
461 | static inline int64_t get_image_offset(BlockDriverState *bs, uint64_t offset, |
462 | bool write) | |
6a0f9e82 FB |
463 | { |
464 | BDRVVPCState *s = bs->opaque; | |
6a0f9e82 | 465 | uint64_t bitmap_offset, block_offset; |
d46b7cc6 | 466 | uint32_t pagetable_index, offset_in_block; |
6a0f9e82 | 467 | |
2cfacb62 | 468 | pagetable_index = offset / s->block_size; |
d46b7cc6 | 469 | offset_in_block = offset % s->block_size; |
3b46e624 | 470 | |
15d35bc5 | 471 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
9c057d0b | 472 | return -1; /* not allocated */ |
6a0f9e82 | 473 | |
378e2aea | 474 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
d46b7cc6 | 475 | block_offset = bitmap_offset + s->bitmap_size + offset_in_block; |
15d35bc5 | 476 | |
9c057d0b JC |
477 | /* We must ensure that we don't write to any sectors which are marked as |
478 | unused in the bitmap. We get away with setting all bits in the block | |
479 | bitmap each time we write to a new block. This might cause Virtual PC to | |
480 | miss sparse read optimization, but it's not a problem in terms of | |
481 | correctness. */ | |
15d35bc5 AL |
482 | if (write && (s->last_bitmap_offset != bitmap_offset)) { |
483 | uint8_t bitmap[s->bitmap_size]; | |
484 | ||
485 | s->last_bitmap_offset = bitmap_offset; | |
486 | memset(bitmap, 0xff, s->bitmap_size); | |
d9ca2ea2 | 487 | bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); |
15d35bc5 | 488 | } |
3b46e624 | 489 | |
b71d1c2e | 490 | return block_offset; |
6a0f9e82 FB |
491 | } |
492 | ||
d46b7cc6 KW |
493 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
494 | int64_t sector_num, bool write) | |
495 | { | |
496 | return get_image_offset(bs, sector_num * BDRV_SECTOR_SIZE, write); | |
497 | } | |
498 | ||
15d35bc5 AL |
499 | /* |
500 | * Writes the footer to the end of the image file. This is needed when the | |
501 | * file grows as it overwrites the old footer | |
502 | * | |
503 | * Returns 0 on success and < 0 on error | |
504 | */ | |
505 | static int rewrite_footer(BlockDriverState* bs) | |
506 | { | |
507 | int ret; | |
508 | BDRVVPCState *s = bs->opaque; | |
509 | int64_t offset = s->free_data_block_offset; | |
510 | ||
d9ca2ea2 | 511 | ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); |
15d35bc5 AL |
512 | if (ret < 0) |
513 | return ret; | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | /* | |
519 | * Allocates a new block. This involves writing a new footer and updating | |
520 | * the Block Allocation Table to use the space at the old end of the image | |
521 | * file (overwriting the old footer) | |
522 | * | |
523 | * Returns the sectors' offset in the image file on success and < 0 on error | |
524 | */ | |
513b0f02 | 525 | static int64_t alloc_block(BlockDriverState* bs, int64_t offset) |
15d35bc5 AL |
526 | { |
527 | BDRVVPCState *s = bs->opaque; | |
528 | int64_t bat_offset; | |
529 | uint32_t index, bat_value; | |
530 | int ret; | |
531 | uint8_t bitmap[s->bitmap_size]; | |
532 | ||
9c057d0b | 533 | /* Check if sector_num is valid */ |
513b0f02 KW |
534 | if ((offset < 0) || (offset > bs->total_sectors * BDRV_SECTOR_SIZE)) { |
535 | return -EINVAL; | |
536 | } | |
15d35bc5 | 537 | |
9c057d0b | 538 | /* Write entry into in-memory BAT */ |
513b0f02 KW |
539 | index = offset / s->block_size; |
540 | assert(s->pagetable[index] == 0xFFFFFFFF); | |
15d35bc5 AL |
541 | s->pagetable[index] = s->free_data_block_offset / 512; |
542 | ||
9c057d0b | 543 | /* Initialize the block's bitmap */ |
15d35bc5 | 544 | memset(bitmap, 0xff, s->bitmap_size); |
d9ca2ea2 | 545 | ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, |
078a458e | 546 | s->bitmap_size); |
5bb1cbac KW |
547 | if (ret < 0) { |
548 | return ret; | |
549 | } | |
15d35bc5 | 550 | |
9c057d0b | 551 | /* Write new footer (the old one will be overwritten) */ |
15d35bc5 AL |
552 | s->free_data_block_offset += s->block_size + s->bitmap_size; |
553 | ret = rewrite_footer(bs); | |
554 | if (ret < 0) | |
555 | goto fail; | |
556 | ||
9c057d0b | 557 | /* Write BAT entry to disk */ |
15d35bc5 | 558 | bat_offset = s->bat_offset + (4 * index); |
a4127c42 | 559 | bat_value = cpu_to_be32(s->pagetable[index]); |
d9ca2ea2 | 560 | ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); |
15d35bc5 AL |
561 | if (ret < 0) |
562 | goto fail; | |
563 | ||
513b0f02 | 564 | return get_image_offset(bs, offset, false); |
15d35bc5 AL |
565 | |
566 | fail: | |
567 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
513b0f02 | 568 | return ret; |
15d35bc5 AL |
569 | } |
570 | ||
97b00e28 PB |
571 | static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
572 | { | |
573 | BDRVVPCState *s = (BDRVVPCState *)bs->opaque; | |
574 | VHDFooter *footer = (VHDFooter *) s->footer_buf; | |
575 | ||
0d4cc3e7 | 576 | if (be32_to_cpu(footer->type) != VHD_FIXED) { |
97b00e28 PB |
577 | bdi->cluster_size = s->block_size; |
578 | } | |
579 | ||
95de6d70 | 580 | bdi->unallocated_blocks_are_zero = true; |
97b00e28 PB |
581 | return 0; |
582 | } | |
583 | ||
d46b7cc6 KW |
584 | static int coroutine_fn |
585 | vpc_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
586 | QEMUIOVector *qiov, int flags) | |
6a0f9e82 | 587 | { |
6c6ea921 | 588 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 589 | int ret; |
d46b7cc6 KW |
590 | int64_t image_offset; |
591 | int64_t n_bytes; | |
592 | int64_t bytes_done = 0; | |
e54835c0 | 593 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
d46b7cc6 | 594 | QEMUIOVector local_qiov; |
6a0f9e82 | 595 | |
0d4cc3e7 | 596 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
a03ef88f | 597 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, 0); |
24da78db | 598 | } |
b71d1c2e | 599 | |
d46b7cc6 KW |
600 | qemu_co_mutex_lock(&s->lock); |
601 | qemu_iovec_init(&local_qiov, qiov->niov); | |
6c6ea921 | 602 | |
d46b7cc6 KW |
603 | while (bytes > 0) { |
604 | image_offset = get_image_offset(bs, offset, false); | |
605 | n_bytes = MIN(bytes, s->block_size - (offset % s->block_size)); | |
606 | ||
607 | if (image_offset == -1) { | |
608 | qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); | |
b71d1c2e | 609 | } else { |
d46b7cc6 KW |
610 | qemu_iovec_reset(&local_qiov); |
611 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); | |
612 | ||
a03ef88f | 613 | ret = bdrv_co_preadv(bs->file, image_offset, n_bytes, |
d46b7cc6 KW |
614 | &local_qiov, 0); |
615 | if (ret < 0) { | |
616 | goto fail; | |
6c6ea921 | 617 | } |
b71d1c2e AL |
618 | } |
619 | ||
d46b7cc6 KW |
620 | bytes -= n_bytes; |
621 | offset += n_bytes; | |
622 | bytes_done += n_bytes; | |
6a0f9e82 | 623 | } |
6a0f9e82 | 624 | |
d46b7cc6 KW |
625 | ret = 0; |
626 | fail: | |
627 | qemu_iovec_destroy(&local_qiov); | |
2914caa0 | 628 | qemu_co_mutex_unlock(&s->lock); |
d46b7cc6 | 629 | |
2914caa0 PB |
630 | return ret; |
631 | } | |
632 | ||
513b0f02 KW |
633 | static int coroutine_fn |
634 | vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, | |
635 | QEMUIOVector *qiov, int flags) | |
15d35bc5 | 636 | { |
6c6ea921 | 637 | BDRVVPCState *s = bs->opaque; |
513b0f02 KW |
638 | int64_t image_offset; |
639 | int64_t n_bytes; | |
640 | int64_t bytes_done = 0; | |
15d35bc5 | 641 | int ret; |
e54835c0 | 642 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
513b0f02 | 643 | QEMUIOVector local_qiov; |
15d35bc5 | 644 | |
0d4cc3e7 | 645 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
a03ef88f | 646 | return bdrv_co_pwritev(bs->file, offset, bytes, qiov, 0); |
24da78db | 647 | } |
15d35bc5 | 648 | |
513b0f02 KW |
649 | qemu_co_mutex_lock(&s->lock); |
650 | qemu_iovec_init(&local_qiov, qiov->niov); | |
651 | ||
652 | while (bytes > 0) { | |
653 | image_offset = get_image_offset(bs, offset, true); | |
654 | n_bytes = MIN(bytes, s->block_size - (offset % s->block_size)); | |
6c6ea921 | 655 | |
513b0f02 KW |
656 | if (image_offset == -1) { |
657 | image_offset = alloc_block(bs, offset); | |
658 | if (image_offset < 0) { | |
659 | ret = image_offset; | |
660 | goto fail; | |
661 | } | |
15d35bc5 AL |
662 | } |
663 | ||
513b0f02 KW |
664 | qemu_iovec_reset(&local_qiov); |
665 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); | |
666 | ||
a03ef88f | 667 | ret = bdrv_co_pwritev(bs->file, image_offset, n_bytes, |
513b0f02 KW |
668 | &local_qiov, 0); |
669 | if (ret < 0) { | |
670 | goto fail; | |
6c6ea921 | 671 | } |
15d35bc5 | 672 | |
513b0f02 KW |
673 | bytes -= n_bytes; |
674 | offset += n_bytes; | |
675 | bytes_done += n_bytes; | |
15d35bc5 AL |
676 | } |
677 | ||
513b0f02 KW |
678 | ret = 0; |
679 | fail: | |
680 | qemu_iovec_destroy(&local_qiov); | |
e183ef75 | 681 | qemu_co_mutex_unlock(&s->lock); |
513b0f02 | 682 | |
e183ef75 PB |
683 | return ret; |
684 | } | |
685 | ||
0cc84887 | 686 | static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs, |
67a0fd2a | 687 | int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) |
0cc84887 KW |
688 | { |
689 | BDRVVPCState *s = bs->opaque; | |
690 | VHDFooter *footer = (VHDFooter*) s->footer_buf; | |
2ec711dc | 691 | int64_t start, offset; |
0cc84887 KW |
692 | bool allocated; |
693 | int n; | |
694 | ||
695 | if (be32_to_cpu(footer->type) == VHD_FIXED) { | |
696 | *pnum = nb_sectors; | |
7429e207 | 697 | *file = bs->file->bs; |
0cc84887 KW |
698 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | |
699 | (sector_num << BDRV_SECTOR_BITS); | |
700 | } | |
701 | ||
702 | offset = get_sector_offset(bs, sector_num, 0); | |
703 | start = offset; | |
704 | allocated = (offset != -1); | |
705 | *pnum = 0; | |
706 | ||
707 | do { | |
708 | /* All sectors in a block are contiguous (without using the bitmap) */ | |
709 | n = ROUND_UP(sector_num + 1, s->block_size / BDRV_SECTOR_SIZE) | |
710 | - sector_num; | |
711 | n = MIN(n, nb_sectors); | |
712 | ||
713 | *pnum += n; | |
714 | sector_num += n; | |
715 | nb_sectors -= n; | |
2ec711dc PL |
716 | /* *pnum can't be greater than one block for allocated |
717 | * sectors since there is always a bitmap in between. */ | |
718 | if (allocated) { | |
7429e207 | 719 | *file = bs->file->bs; |
2ec711dc PL |
720 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start; |
721 | } | |
0cc84887 KW |
722 | if (nb_sectors == 0) { |
723 | break; | |
724 | } | |
0cc84887 | 725 | offset = get_sector_offset(bs, sector_num, 0); |
2ec711dc | 726 | } while (offset == -1); |
0cc84887 | 727 | |
2ec711dc | 728 | return 0; |
0cc84887 KW |
729 | } |
730 | ||
57c7d9e5 AL |
731 | /* |
732 | * Calculates the number of cylinders, heads and sectors per cylinder | |
733 | * based on a given number of sectors. This is the algorithm described | |
734 | * in the VHD specification. | |
735 | * | |
736 | * Note that the geometry doesn't always exactly match total_sectors but | |
737 | * may round it down. | |
6e9ea0c0 | 738 | * |
c23fb11b | 739 | * Returns 0 on success, -EFBIG if the size is larger than 2040 GiB. Override |
258d2edb CA |
740 | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) |
741 | * and instead allow up to 255 heads. | |
57c7d9e5 | 742 | */ |
6e9ea0c0 | 743 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
57c7d9e5 AL |
744 | uint8_t* heads, uint8_t* secs_per_cyl) |
745 | { | |
746 | uint32_t cyls_times_heads; | |
747 | ||
690cbb09 | 748 | total_sectors = MIN(total_sectors, VHD_MAX_GEOMETRY); |
57c7d9e5 | 749 | |
690cbb09 | 750 | if (total_sectors >= 65535LL * 16 * 63) { |
57c7d9e5 | 751 | *secs_per_cyl = 255; |
690cbb09 | 752 | *heads = 16; |
57c7d9e5 AL |
753 | cyls_times_heads = total_sectors / *secs_per_cyl; |
754 | } else { | |
755 | *secs_per_cyl = 17; | |
756 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
757 | *heads = (cyls_times_heads + 1023) / 1024; | |
758 | ||
690cbb09 | 759 | if (*heads < 4) { |
57c7d9e5 | 760 | *heads = 4; |
690cbb09 | 761 | } |
57c7d9e5 AL |
762 | |
763 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
764 | *secs_per_cyl = 31; | |
765 | *heads = 16; | |
766 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
767 | } | |
768 | ||
769 | if (cyls_times_heads >= (*heads * 1024)) { | |
770 | *secs_per_cyl = 63; | |
771 | *heads = 16; | |
772 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
773 | } | |
774 | } | |
775 | ||
dede4188 | 776 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
777 | |
778 | return 0; | |
57c7d9e5 AL |
779 | } |
780 | ||
b8f45cdf | 781 | static int create_dynamic_disk(BlockBackend *blk, uint8_t *buf, |
fef6070e | 782 | int64_t total_sectors) |
57c7d9e5 | 783 | { |
e54835c0 JC |
784 | VHDDynDiskHeader *dyndisk_header = |
785 | (VHDDynDiskHeader *) buf; | |
57c7d9e5 | 786 | size_t block_size, num_bat_entries; |
24da78db | 787 | int i; |
fef6070e JC |
788 | int ret; |
789 | int64_t offset = 0; | |
57c7d9e5 | 790 | |
9c057d0b | 791 | /* Write the footer (twice: at the beginning and at the end) */ |
57c7d9e5 AL |
792 | block_size = 0x200000; |
793 | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); | |
794 | ||
8341f00d | 795 | ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0); |
40a99aac | 796 | if (ret < 0) { |
f0ff243a BS |
797 | goto fail; |
798 | } | |
57c7d9e5 | 799 | |
fef6070e | 800 | offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); |
8341f00d | 801 | ret = blk_pwrite(blk, offset, buf, HEADER_SIZE, 0); |
fef6070e | 802 | if (ret < 0) { |
f0ff243a BS |
803 | goto fail; |
804 | } | |
57c7d9e5 | 805 | |
9c057d0b | 806 | /* Write the initial BAT */ |
fef6070e | 807 | offset = 3 * 512; |
57c7d9e5 AL |
808 | |
809 | memset(buf, 0xFF, 512); | |
f0ff243a | 810 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
8341f00d | 811 | ret = blk_pwrite(blk, offset, buf, 512, 0); |
fef6070e | 812 | if (ret < 0) { |
f0ff243a BS |
813 | goto fail; |
814 | } | |
fef6070e | 815 | offset += 512; |
f0ff243a | 816 | } |
57c7d9e5 | 817 | |
9c057d0b | 818 | /* Prepare the Dynamic Disk Header */ |
57c7d9e5 AL |
819 | memset(buf, 0, 1024); |
820 | ||
5ec4d682 | 821 | memcpy(dyndisk_header->magic, "cxsparse", 8); |
57c7d9e5 | 822 | |
78439f6a CA |
823 | /* |
824 | * Note: The spec is actually wrong here for data_offset, it says | |
825 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. | |
826 | */ | |
a4127c42 SH |
827 | dyndisk_header->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
828 | dyndisk_header->table_offset = cpu_to_be64(3 * 512); | |
829 | dyndisk_header->version = cpu_to_be32(0x00010000); | |
830 | dyndisk_header->block_size = cpu_to_be32(block_size); | |
831 | dyndisk_header->max_table_entries = cpu_to_be32(num_bat_entries); | |
57c7d9e5 | 832 | |
a4127c42 | 833 | dyndisk_header->checksum = cpu_to_be32(vpc_checksum(buf, 1024)); |
57c7d9e5 | 834 | |
9c057d0b | 835 | /* Write the header */ |
fef6070e | 836 | offset = 512; |
57c7d9e5 | 837 | |
8341f00d | 838 | ret = blk_pwrite(blk, offset, buf, 1024, 0); |
fef6070e | 839 | if (ret < 0) { |
f0ff243a BS |
840 | goto fail; |
841 | } | |
f0ff243a | 842 | |
24da78db CA |
843 | fail: |
844 | return ret; | |
845 | } | |
846 | ||
b8f45cdf | 847 | static int create_fixed_disk(BlockBackend *blk, uint8_t *buf, |
fef6070e | 848 | int64_t total_size) |
24da78db | 849 | { |
fef6070e | 850 | int ret; |
24da78db CA |
851 | |
852 | /* Add footer to total size */ | |
fef6070e JC |
853 | total_size += HEADER_SIZE; |
854 | ||
b8f45cdf | 855 | ret = blk_truncate(blk, total_size); |
fef6070e JC |
856 | if (ret < 0) { |
857 | return ret; | |
24da78db CA |
858 | } |
859 | ||
8341f00d | 860 | ret = blk_pwrite(blk, total_size - HEADER_SIZE, buf, HEADER_SIZE, 0); |
fef6070e JC |
861 | if (ret < 0) { |
862 | return ret; | |
863 | } | |
24da78db | 864 | |
24da78db CA |
865 | return ret; |
866 | } | |
867 | ||
fec9921f | 868 | static int vpc_create(const char *filename, QemuOpts *opts, Error **errp) |
24da78db CA |
869 | { |
870 | uint8_t buf[1024]; | |
e54835c0 | 871 | VHDFooter *footer = (VHDFooter *) buf; |
fec9921f | 872 | char *disk_type_param; |
fef6070e | 873 | int i; |
24da78db CA |
874 | uint16_t cyls = 0; |
875 | uint8_t heads = 0; | |
876 | uint8_t secs_per_cyl = 0; | |
877 | int64_t total_sectors; | |
878 | int64_t total_size; | |
879 | int disk_type; | |
880 | int ret = -EIO; | |
fb9245c2 | 881 | bool force_size; |
fef6070e | 882 | Error *local_err = NULL; |
b8f45cdf | 883 | BlockBackend *blk = NULL; |
24da78db CA |
884 | |
885 | /* Read out options */ | |
c2eb918e HT |
886 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
887 | BDRV_SECTOR_SIZE); | |
fec9921f CL |
888 | disk_type_param = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); |
889 | if (disk_type_param) { | |
890 | if (!strcmp(disk_type_param, "dynamic")) { | |
24da78db | 891 | disk_type = VHD_DYNAMIC; |
fec9921f | 892 | } else if (!strcmp(disk_type_param, "fixed")) { |
24da78db CA |
893 | disk_type = VHD_FIXED; |
894 | } else { | |
0211b9be | 895 | error_setg(errp, "Invalid disk type, %s", disk_type_param); |
fec9921f CL |
896 | ret = -EINVAL; |
897 | goto out; | |
24da78db CA |
898 | } |
899 | } else { | |
900 | disk_type = VHD_DYNAMIC; | |
901 | } | |
902 | ||
fb9245c2 JC |
903 | force_size = qemu_opt_get_bool_del(opts, VPC_OPT_FORCE_SIZE, false); |
904 | ||
fef6070e JC |
905 | ret = bdrv_create_file(filename, opts, &local_err); |
906 | if (ret < 0) { | |
907 | error_propagate(errp, local_err); | |
fec9921f | 908 | goto out; |
24da78db | 909 | } |
b8f45cdf | 910 | |
efaa7c4e | 911 | blk = blk_new_open(filename, NULL, NULL, |
72e775c7 | 912 | BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); |
b8f45cdf | 913 | if (blk == NULL) { |
fef6070e | 914 | error_propagate(errp, local_err); |
b8f45cdf | 915 | ret = -EIO; |
fef6070e | 916 | goto out; |
4ab15590 CL |
917 | } |
918 | ||
b8f45cdf KW |
919 | blk_set_allow_write_beyond_eof(blk, true); |
920 | ||
ecd880d9 KW |
921 | /* |
922 | * Calculate matching total_size and geometry. Increase the number of | |
923 | * sectors requested until we get enough (or fail). This ensures that | |
924 | * qemu-img convert doesn't truncate images, but rather rounds up. | |
690cbb09 | 925 | * |
fb9245c2 | 926 | * If the image size can't be represented by a spec conformant CHS geometry, |
690cbb09 PL |
927 | * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use |
928 | * the image size from the VHD footer to calculate total_sectors. | |
ecd880d9 | 929 | */ |
fb9245c2 JC |
930 | if (force_size) { |
931 | /* This will force the use of total_size for sector count, below */ | |
932 | cyls = VHD_CHS_MAX_C; | |
933 | heads = VHD_CHS_MAX_H; | |
934 | secs_per_cyl = VHD_CHS_MAX_S; | |
935 | } else { | |
936 | total_sectors = MIN(VHD_MAX_GEOMETRY, total_size / BDRV_SECTOR_SIZE); | |
937 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { | |
938 | calculate_geometry(total_sectors + i, &cyls, &heads, &secs_per_cyl); | |
939 | } | |
690cbb09 PL |
940 | } |
941 | ||
942 | if ((int64_t)cyls * heads * secs_per_cyl == VHD_MAX_GEOMETRY) { | |
943 | total_sectors = total_size / BDRV_SECTOR_SIZE; | |
c23fb11b | 944 | /* Allow a maximum disk size of 2040 GiB */ |
690cbb09 | 945 | if (total_sectors > VHD_MAX_SECTORS) { |
0211b9be | 946 | error_setg(errp, "Disk size is too large, max size is 2040 GiB"); |
24da78db | 947 | ret = -EFBIG; |
fef6070e | 948 | goto out; |
24da78db | 949 | } |
690cbb09 PL |
950 | } else { |
951 | total_sectors = (int64_t)cyls * heads * secs_per_cyl; | |
952 | total_size = total_sectors * BDRV_SECTOR_SIZE; | |
24da78db | 953 | } |
ecd880d9 | 954 | |
24da78db CA |
955 | /* Prepare the Hard Disk Footer */ |
956 | memset(buf, 0, 1024); | |
957 | ||
958 | memcpy(footer->creator, "conectix", 8); | |
fb9245c2 JC |
959 | if (force_size) { |
960 | memcpy(footer->creator_app, "qem2", 4); | |
961 | } else { | |
962 | memcpy(footer->creator_app, "qemu", 4); | |
963 | } | |
24da78db CA |
964 | memcpy(footer->creator_os, "Wi2k", 4); |
965 | ||
a4127c42 SH |
966 | footer->features = cpu_to_be32(0x02); |
967 | footer->version = cpu_to_be32(0x00010000); | |
24da78db | 968 | if (disk_type == VHD_DYNAMIC) { |
a4127c42 | 969 | footer->data_offset = cpu_to_be64(HEADER_SIZE); |
24da78db | 970 | } else { |
a4127c42 | 971 | footer->data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
24da78db | 972 | } |
a4127c42 | 973 | footer->timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); |
24da78db CA |
974 | |
975 | /* Version of Virtual PC 2007 */ | |
a4127c42 SH |
976 | footer->major = cpu_to_be16(0x0005); |
977 | footer->minor = cpu_to_be16(0x0003); | |
3f3f20dc | 978 | footer->orig_size = cpu_to_be64(total_size); |
03671ded | 979 | footer->current_size = cpu_to_be64(total_size); |
a4127c42 | 980 | footer->cyls = cpu_to_be16(cyls); |
24da78db CA |
981 | footer->heads = heads; |
982 | footer->secs_per_cyl = secs_per_cyl; | |
983 | ||
a4127c42 | 984 | footer->type = cpu_to_be32(disk_type); |
24da78db | 985 | |
38440a21 | 986 | qemu_uuid_generate(&footer->uuid); |
24da78db | 987 | |
a4127c42 | 988 | footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE)); |
24da78db CA |
989 | |
990 | if (disk_type == VHD_DYNAMIC) { | |
b8f45cdf | 991 | ret = create_dynamic_disk(blk, buf, total_sectors); |
24da78db | 992 | } else { |
b8f45cdf | 993 | ret = create_fixed_disk(blk, buf, total_size); |
24da78db | 994 | } |
0211b9be JC |
995 | if (ret < 0) { |
996 | error_setg(errp, "Unable to create or write VHD header"); | |
997 | } | |
24da78db | 998 | |
fec9921f | 999 | out: |
b8f45cdf | 1000 | blk_unref(blk); |
fec9921f | 1001 | g_free(disk_type_param); |
f0ff243a | 1002 | return ret; |
57c7d9e5 AL |
1003 | } |
1004 | ||
72c6cc94 KW |
1005 | static int vpc_has_zero_init(BlockDriverState *bs) |
1006 | { | |
1007 | BDRVVPCState *s = bs->opaque; | |
e54835c0 | 1008 | VHDFooter *footer = (VHDFooter *) s->footer_buf; |
72c6cc94 | 1009 | |
0d4cc3e7 | 1010 | if (be32_to_cpu(footer->type) == VHD_FIXED) { |
9a4f4c31 | 1011 | return bdrv_has_zero_init(bs->file->bs); |
72c6cc94 KW |
1012 | } else { |
1013 | return 1; | |
1014 | } | |
1015 | } | |
1016 | ||
6a0f9e82 FB |
1017 | static void vpc_close(BlockDriverState *bs) |
1018 | { | |
1019 | BDRVVPCState *s = bs->opaque; | |
97f1c45c | 1020 | qemu_vfree(s->pagetable); |
6a0f9e82 | 1021 | #ifdef CACHE |
7267c094 | 1022 | g_free(s->pageentry_u8); |
6a0f9e82 | 1023 | #endif |
612ff3d8 KW |
1024 | |
1025 | migrate_del_blocker(s->migration_blocker); | |
1026 | error_free(s->migration_blocker); | |
6a0f9e82 FB |
1027 | } |
1028 | ||
fec9921f CL |
1029 | static QemuOptsList vpc_create_opts = { |
1030 | .name = "vpc-create-opts", | |
1031 | .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head), | |
1032 | .desc = { | |
1033 | { | |
1034 | .name = BLOCK_OPT_SIZE, | |
1035 | .type = QEMU_OPT_SIZE, | |
1036 | .help = "Virtual disk size" | |
1037 | }, | |
1038 | { | |
1039 | .name = BLOCK_OPT_SUBFMT, | |
1040 | .type = QEMU_OPT_STRING, | |
1041 | .help = | |
1042 | "Type of virtual hard disk format. Supported formats are " | |
1043 | "{dynamic (default) | fixed} " | |
1044 | }, | |
fb9245c2 JC |
1045 | { |
1046 | .name = VPC_OPT_FORCE_SIZE, | |
1047 | .type = QEMU_OPT_BOOL, | |
1048 | .help = "Force disk size calculation to use the actual size " | |
1049 | "specified, rather than using the nearest CHS-based " | |
1050 | "calculation" | |
1051 | }, | |
fec9921f CL |
1052 | { /* end of list */ } |
1053 | } | |
0e7e1989 KW |
1054 | }; |
1055 | ||
5efa9d5a | 1056 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
1057 | .format_name = "vpc", |
1058 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 1059 | |
72c6cc94 KW |
1060 | .bdrv_probe = vpc_probe, |
1061 | .bdrv_open = vpc_open, | |
1062 | .bdrv_close = vpc_close, | |
1063 | .bdrv_reopen_prepare = vpc_reopen_prepare, | |
c282e1fd | 1064 | .bdrv_create = vpc_create, |
0e7e1989 | 1065 | |
d46b7cc6 | 1066 | .bdrv_co_preadv = vpc_co_preadv, |
513b0f02 | 1067 | .bdrv_co_pwritev = vpc_co_pwritev, |
0cc84887 | 1068 | .bdrv_co_get_block_status = vpc_co_get_block_status, |
c68b89ac | 1069 | |
97b00e28 PB |
1070 | .bdrv_get_info = vpc_get_info, |
1071 | ||
fec9921f | 1072 | .create_opts = &vpc_create_opts, |
72c6cc94 | 1073 | .bdrv_has_zero_init = vpc_has_zero_init, |
6a0f9e82 | 1074 | }; |
5efa9d5a AL |
1075 | |
1076 | static void bdrv_vpc_init(void) | |
1077 | { | |
1078 | bdrv_register(&bdrv_vpc); | |
1079 | } | |
1080 | ||
1081 | block_init(bdrv_vpc_init); |