| 1 | /* |
| 2 | * Block driver for Connectix / Microsoft Virtual PC images |
| 3 | * |
| 4 | * Copyright (c) 2005 Alex Beregszaszi |
| 5 | * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> |
| 6 | * |
| 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 | */ |
| 25 | |
| 26 | #include "qemu/osdep.h" |
| 27 | #include "qapi/error.h" |
| 28 | #include "block/block_int.h" |
| 29 | #include "block/qdict.h" |
| 30 | #include "system/block-backend.h" |
| 31 | #include "qemu/module.h" |
| 32 | #include "qemu/option.h" |
| 33 | #include "migration/blocker.h" |
| 34 | #include "qemu/bswap.h" |
| 35 | #include "qemu/uuid.h" |
| 36 | #include "qemu/memalign.h" |
| 37 | #include "qobject/qdict.h" |
| 38 | #include "qapi/qobject-input-visitor.h" |
| 39 | #include "qapi/qapi-visit-block-core.h" |
| 40 | |
| 41 | /**************************************************************/ |
| 42 | |
| 43 | //#define CACHE |
| 44 | |
| 45 | enum vhd_type { |
| 46 | VHD_FIXED = 2, |
| 47 | VHD_DYNAMIC = 3, |
| 48 | VHD_DIFFERENCING = 4, |
| 49 | }; |
| 50 | |
| 51 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
| 52 | #define VHD_TIMESTAMP_BASE 946684800 |
| 53 | |
| 54 | #define VHD_CHS_MAX_C 65535LL |
| 55 | #define VHD_CHS_MAX_H 16 |
| 56 | #define VHD_CHS_MAX_S 255 |
| 57 | |
| 58 | #define VHD_MAX_SECTORS 0xff000000 /* 2040 GiB max image size */ |
| 59 | #define VHD_MAX_GEOMETRY (VHD_CHS_MAX_C * VHD_CHS_MAX_H * VHD_CHS_MAX_S) |
| 60 | |
| 61 | #define VPC_OPT_FORCE_SIZE "force_size" |
| 62 | |
| 63 | /* always big-endian */ |
| 64 | typedef struct vhd_footer { |
| 65 | char creator[8]; /* "conectix" */ |
| 66 | uint32_t features; |
| 67 | uint32_t version; |
| 68 | |
| 69 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
| 70 | uint64_t data_offset; |
| 71 | |
| 72 | /* Seconds since Jan 1, 2000 0:00:00 (UTC) */ |
| 73 | uint32_t timestamp; |
| 74 | |
| 75 | char creator_app[4]; /* e.g., "vpc " */ |
| 76 | uint16_t major; |
| 77 | uint16_t minor; |
| 78 | char creator_os[4]; /* "Wi2k" */ |
| 79 | |
| 80 | uint64_t orig_size; |
| 81 | uint64_t current_size; |
| 82 | |
| 83 | uint16_t cyls; |
| 84 | uint8_t heads; |
| 85 | uint8_t secs_per_cyl; |
| 86 | |
| 87 | uint32_t type; |
| 88 | |
| 89 | /* Checksum of the Hard Disk Footer ("one's complement of the sum of all |
| 90 | the bytes in the footer without the checksum field") */ |
| 91 | uint32_t checksum; |
| 92 | |
| 93 | /* UUID used to identify a parent hard disk (backing file) */ |
| 94 | QemuUUID uuid; |
| 95 | |
| 96 | uint8_t in_saved_state; |
| 97 | uint8_t reserved[427]; |
| 98 | } QEMU_PACKED VHDFooter; |
| 99 | |
| 100 | QEMU_BUILD_BUG_ON(sizeof(VHDFooter) != 512); |
| 101 | |
| 102 | typedef struct vhd_dyndisk_header { |
| 103 | char magic[8]; /* "cxsparse" */ |
| 104 | |
| 105 | /* Offset of next header structure, 0xFFFFFFFF if none */ |
| 106 | uint64_t data_offset; |
| 107 | |
| 108 | /* Offset of the Block Allocation Table (BAT) */ |
| 109 | uint64_t table_offset; |
| 110 | |
| 111 | uint32_t version; |
| 112 | uint32_t max_table_entries; /* 32bit/entry */ |
| 113 | |
| 114 | /* 2 MB by default, must be a power of two */ |
| 115 | uint32_t block_size; |
| 116 | |
| 117 | uint32_t checksum; |
| 118 | uint8_t parent_uuid[16]; |
| 119 | uint32_t parent_timestamp; |
| 120 | uint32_t reserved; |
| 121 | |
| 122 | /* Backing file name (in UTF-16) */ |
| 123 | uint8_t parent_name[512]; |
| 124 | |
| 125 | struct { |
| 126 | uint32_t platform; |
| 127 | uint32_t data_space; |
| 128 | uint32_t data_length; |
| 129 | uint32_t reserved; |
| 130 | uint64_t data_offset; |
| 131 | } parent_locator[8]; |
| 132 | uint8_t reserved2[256]; |
| 133 | } QEMU_PACKED VHDDynDiskHeader; |
| 134 | |
| 135 | QEMU_BUILD_BUG_ON(sizeof(VHDDynDiskHeader) != 1024); |
| 136 | |
| 137 | typedef struct BDRVVPCState { |
| 138 | CoMutex lock; |
| 139 | VHDFooter footer; |
| 140 | uint64_t free_data_block_offset; |
| 141 | int max_table_entries; |
| 142 | uint32_t *pagetable; |
| 143 | uint64_t bat_offset; |
| 144 | uint64_t last_bitmap_offset; |
| 145 | |
| 146 | uint32_t block_size; |
| 147 | uint32_t bitmap_size; |
| 148 | bool force_use_chs; |
| 149 | bool force_use_sz; |
| 150 | |
| 151 | #ifdef CACHE |
| 152 | uint8_t *pageentry_u8; |
| 153 | uint32_t *pageentry_u32; |
| 154 | uint16_t *pageentry_u16; |
| 155 | |
| 156 | uint64_t last_bitmap; |
| 157 | #endif |
| 158 | |
| 159 | Error *migration_blocker; |
| 160 | } BDRVVPCState; |
| 161 | |
| 162 | #define VPC_OPT_SIZE_CALC "force_size_calc" |
| 163 | static QemuOptsList vpc_runtime_opts = { |
| 164 | .name = "vpc-runtime-opts", |
| 165 | .head = QTAILQ_HEAD_INITIALIZER(vpc_runtime_opts.head), |
| 166 | .desc = { |
| 167 | { |
| 168 | .name = VPC_OPT_SIZE_CALC, |
| 169 | .type = QEMU_OPT_STRING, |
| 170 | .help = "Force disk size calculation to use either CHS geometry, " |
| 171 | "or use the disk current_size specified in the VHD footer. " |
| 172 | "{chs, current_size}" |
| 173 | }, |
| 174 | { /* end of list */ } |
| 175 | } |
| 176 | }; |
| 177 | |
| 178 | static QemuOptsList vpc_create_opts; |
| 179 | |
| 180 | static uint32_t vpc_checksum(void *p, size_t size) |
| 181 | { |
| 182 | uint8_t *buf = p; |
| 183 | uint32_t res = 0; |
| 184 | int i; |
| 185 | |
| 186 | for (i = 0; i < size; i++) |
| 187 | res += buf[i]; |
| 188 | |
| 189 | return ~res; |
| 190 | } |
| 191 | |
| 192 | |
| 193 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 194 | { |
| 195 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
| 196 | return 100; |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static void vpc_parse_options(BlockDriverState *bs, QemuOpts *opts, |
| 201 | Error **errp) |
| 202 | { |
| 203 | BDRVVPCState *s = bs->opaque; |
| 204 | const char *size_calc; |
| 205 | |
| 206 | size_calc = qemu_opt_get(opts, VPC_OPT_SIZE_CALC); |
| 207 | |
| 208 | if (!size_calc) { |
| 209 | /* no override, use autodetect only */ |
| 210 | } else if (!strcmp(size_calc, "current_size")) { |
| 211 | s->force_use_sz = true; |
| 212 | } else if (!strcmp(size_calc, "chs")) { |
| 213 | s->force_use_chs = true; |
| 214 | } else { |
| 215 | error_setg(errp, "Invalid size calculation mode: '%s'", size_calc); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Microsoft Virtual PC and Microsoft Hyper-V produce and read |
| 221 | * VHD image sizes differently. VPC will rely on CHS geometry, |
| 222 | * while Hyper-V and disk2vhd use the size specified in the footer. |
| 223 | * |
| 224 | * We use a couple of approaches to try and determine the correct method: |
| 225 | * look at the Creator App field, and look for images that have CHS |
| 226 | * geometry that is the maximum value. |
| 227 | * |
| 228 | * If the CHS geometry is the maximum CHS geometry, then we assume that |
| 229 | * the size is the footer->current_size to avoid truncation. Otherwise, |
| 230 | * we follow the table based on footer->creator_app: |
| 231 | * |
| 232 | * Known creator apps: |
| 233 | * 'vpc ' : CHS Virtual PC (uses disk geometry) |
| 234 | * 'qemu' : CHS QEMU (uses disk geometry) |
| 235 | * 'qem2' : current_size QEMU (uses current_size) |
| 236 | * 'win ' : current_size Hyper-V |
| 237 | * 'd2v ' : current_size Disk2vhd |
| 238 | * 'tap\0' : current_size XenServer |
| 239 | * 'CTXS' : current_size XenConverter |
| 240 | * 'wa\0\0': current_size Azure |
| 241 | * |
| 242 | * The user can override the table values via drive options, however |
| 243 | * even with an override we will still use current_size for images |
| 244 | * that have CHS geometry of the maximum size. |
| 245 | */ |
| 246 | static bool vpc_ignore_current_size(VHDFooter *footer) |
| 247 | { |
| 248 | return !strncmp(footer->creator_app, "vpc ", 4) || |
| 249 | !strncmp(footer->creator_app, "qemu", 4); |
| 250 | } |
| 251 | |
| 252 | static int vpc_open(BlockDriverState *bs, QDict *options, int flags, |
| 253 | Error **errp) |
| 254 | { |
| 255 | BDRVVPCState *s = bs->opaque; |
| 256 | int i; |
| 257 | VHDFooter *footer; |
| 258 | QemuOpts *opts = NULL; |
| 259 | Error *local_err = NULL; |
| 260 | bool use_chs; |
| 261 | VHDDynDiskHeader dyndisk_header; |
| 262 | uint32_t checksum; |
| 263 | uint64_t computed_size; |
| 264 | uint64_t pagetable_size; |
| 265 | int disk_type = VHD_DYNAMIC; |
| 266 | int ret; |
| 267 | int64_t bs_size; |
| 268 | |
| 269 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
| 270 | if (ret < 0) { |
| 271 | return ret; |
| 272 | } |
| 273 | |
| 274 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 275 | |
| 276 | opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort); |
| 277 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
| 278 | ret = -EINVAL; |
| 279 | goto fail; |
| 280 | } |
| 281 | |
| 282 | vpc_parse_options(bs, opts, &local_err); |
| 283 | if (local_err) { |
| 284 | error_propagate(errp, local_err); |
| 285 | ret = -EINVAL; |
| 286 | goto fail; |
| 287 | } |
| 288 | |
| 289 | ret = bdrv_pread(bs->file, 0, sizeof(s->footer), &s->footer, 0); |
| 290 | if (ret < 0) { |
| 291 | error_setg(errp, "Unable to read VHD header"); |
| 292 | goto fail; |
| 293 | } |
| 294 | |
| 295 | footer = &s->footer; |
| 296 | if (strncmp(footer->creator, "conectix", 8)) { |
| 297 | int64_t offset = bdrv_getlength(bs->file->bs); |
| 298 | if (offset < 0) { |
| 299 | ret = offset; |
| 300 | error_setg(errp, "Invalid file size"); |
| 301 | goto fail; |
| 302 | } else if (offset < sizeof(*footer)) { |
| 303 | ret = -EINVAL; |
| 304 | error_setg(errp, "File too small for a VHD header"); |
| 305 | goto fail; |
| 306 | } |
| 307 | |
| 308 | /* If a fixed disk, the footer is found only at the end of the file */ |
| 309 | ret = bdrv_pread(bs->file, offset - sizeof(*footer), sizeof(*footer), |
| 310 | footer, 0); |
| 311 | if (ret < 0) { |
| 312 | goto fail; |
| 313 | } |
| 314 | if (strncmp(footer->creator, "conectix", 8) || |
| 315 | be32_to_cpu(footer->type) != VHD_FIXED) { |
| 316 | error_setg(errp, "invalid VPC image"); |
| 317 | ret = -EINVAL; |
| 318 | goto fail; |
| 319 | } |
| 320 | disk_type = VHD_FIXED; |
| 321 | } |
| 322 | |
| 323 | checksum = be32_to_cpu(footer->checksum); |
| 324 | footer->checksum = 0; |
| 325 | if (vpc_checksum(footer, sizeof(*footer)) != checksum) { |
| 326 | error_setg(errp, "Incorrect header checksum"); |
| 327 | ret = -EINVAL; |
| 328 | goto fail; |
| 329 | } |
| 330 | |
| 331 | /* Write 'checksum' back to footer, or else will leave it with zero. */ |
| 332 | footer->checksum = cpu_to_be32(checksum); |
| 333 | |
| 334 | /* The visible size of a image in Virtual PC depends on the geometry |
| 335 | rather than on the size stored in the footer (the size in the footer |
| 336 | is too large usually) */ |
| 337 | bs->total_sectors = (int64_t) |
| 338 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; |
| 339 | |
| 340 | /* Use CHS or current_size to determine the image size. */ |
| 341 | use_chs = vpc_ignore_current_size(footer) || s->force_use_chs; |
| 342 | |
| 343 | if (!use_chs || bs->total_sectors == VHD_MAX_GEOMETRY || s->force_use_sz) { |
| 344 | bs->total_sectors = be64_to_cpu(footer->current_size) / |
| 345 | BDRV_SECTOR_SIZE; |
| 346 | } |
| 347 | |
| 348 | /* Allow a maximum disk size of 2040 GiB */ |
| 349 | if (bs->total_sectors > VHD_MAX_SECTORS) { |
| 350 | ret = -EFBIG; |
| 351 | goto fail; |
| 352 | } |
| 353 | |
| 354 | if (disk_type == VHD_DYNAMIC) { |
| 355 | ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), |
| 356 | sizeof(dyndisk_header), &dyndisk_header, 0); |
| 357 | if (ret < 0) { |
| 358 | error_setg(errp, "Error reading dynamic VHD header"); |
| 359 | goto fail; |
| 360 | } |
| 361 | |
| 362 | if (strncmp(dyndisk_header.magic, "cxsparse", 8)) { |
| 363 | error_setg(errp, "Invalid header magic"); |
| 364 | ret = -EINVAL; |
| 365 | goto fail; |
| 366 | } |
| 367 | |
| 368 | s->block_size = be32_to_cpu(dyndisk_header.block_size); |
| 369 | if (!is_power_of_2(s->block_size) || s->block_size < BDRV_SECTOR_SIZE) { |
| 370 | error_setg(errp, "Invalid block size %" PRIu32, s->block_size); |
| 371 | ret = -EINVAL; |
| 372 | goto fail; |
| 373 | } |
| 374 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; |
| 375 | |
| 376 | s->max_table_entries = be32_to_cpu(dyndisk_header.max_table_entries); |
| 377 | |
| 378 | if ((bs->total_sectors * 512) / s->block_size > 0xffffffffU) { |
| 379 | error_setg(errp, "Too many blocks"); |
| 380 | ret = -EINVAL; |
| 381 | goto fail; |
| 382 | } |
| 383 | |
| 384 | computed_size = (uint64_t) s->max_table_entries * s->block_size; |
| 385 | if (computed_size < bs->total_sectors * 512) { |
| 386 | error_setg(errp, "Page table too small"); |
| 387 | ret = -EINVAL; |
| 388 | goto fail; |
| 389 | } |
| 390 | |
| 391 | if (s->max_table_entries > SIZE_MAX / 4 || |
| 392 | s->max_table_entries > (int) INT_MAX / 4) { |
| 393 | error_setg(errp, "Max Table Entries too large (%" PRId32 ")", |
| 394 | s->max_table_entries); |
| 395 | ret = -EINVAL; |
| 396 | goto fail; |
| 397 | } |
| 398 | |
| 399 | pagetable_size = (uint64_t) s->max_table_entries * 4; |
| 400 | |
| 401 | s->pagetable = qemu_try_blockalign(bs->file->bs, pagetable_size); |
| 402 | if (s->pagetable == NULL) { |
| 403 | error_setg(errp, "Unable to allocate memory for page table"); |
| 404 | ret = -ENOMEM; |
| 405 | goto fail; |
| 406 | } |
| 407 | |
| 408 | s->bat_offset = be64_to_cpu(dyndisk_header.table_offset); |
| 409 | |
| 410 | ret = bdrv_pread(bs->file, s->bat_offset, pagetable_size, |
| 411 | s->pagetable, 0); |
| 412 | if (ret < 0) { |
| 413 | error_setg(errp, "Error reading pagetable"); |
| 414 | goto fail; |
| 415 | } |
| 416 | |
| 417 | s->free_data_block_offset = |
| 418 | ROUND_UP(s->bat_offset + pagetable_size, 512); |
| 419 | |
| 420 | for (i = 0; i < s->max_table_entries; i++) { |
| 421 | be32_to_cpus(&s->pagetable[i]); |
| 422 | if (s->pagetable[i] != 0xFFFFFFFF) { |
| 423 | int64_t next = (512 * (int64_t) s->pagetable[i]) + |
| 424 | s->bitmap_size + s->block_size; |
| 425 | |
| 426 | if (next > s->free_data_block_offset) { |
| 427 | s->free_data_block_offset = next; |
| 428 | } |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | bs_size = bdrv_getlength(bs->file->bs); |
| 433 | if (bs_size < 0) { |
| 434 | error_setg_errno(errp, -bs_size, "Unable to learn image size"); |
| 435 | ret = bs_size; |
| 436 | goto fail; |
| 437 | } |
| 438 | if (s->free_data_block_offset > bs_size) { |
| 439 | error_setg(errp, "block-vpc: free_data_block_offset points after " |
| 440 | "the end of file. The image has been truncated."); |
| 441 | ret = -EINVAL; |
| 442 | goto fail; |
| 443 | } |
| 444 | |
| 445 | s->last_bitmap_offset = (int64_t) -1; |
| 446 | |
| 447 | #ifdef CACHE |
| 448 | s->pageentry_u8 = g_malloc(512); |
| 449 | s->pageentry_u32 = s->pageentry_u8; |
| 450 | s->pageentry_u16 = s->pageentry_u8; |
| 451 | s->last_pagetable = -1; |
| 452 | #endif |
| 453 | } |
| 454 | |
| 455 | /* Disable migration when VHD images are used */ |
| 456 | error_setg(&s->migration_blocker, "The vpc format used by node '%s' " |
| 457 | "does not support live migration", |
| 458 | bdrv_get_device_or_node_name(bs)); |
| 459 | |
| 460 | ret = migrate_add_blocker_normal(&s->migration_blocker, errp); |
| 461 | if (ret < 0) { |
| 462 | goto fail; |
| 463 | } |
| 464 | |
| 465 | qemu_co_mutex_init(&s->lock); |
| 466 | qemu_opts_del(opts); |
| 467 | |
| 468 | return 0; |
| 469 | |
| 470 | fail: |
| 471 | qemu_opts_del(opts); |
| 472 | qemu_vfree(s->pagetable); |
| 473 | #ifdef CACHE |
| 474 | g_free(s->pageentry_u8); |
| 475 | #endif |
| 476 | return ret; |
| 477 | } |
| 478 | |
| 479 | static int vpc_reopen_prepare(BDRVReopenState *state, |
| 480 | BlockReopenQueue *queue, Error **errp) |
| 481 | { |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Returns the absolute byte offset of the given sector in the image file. |
| 487 | * If the sector is not allocated, -1 is returned instead. |
| 488 | * If an error occurred trying to write an updated block bitmap back to |
| 489 | * the file, -2 is returned, and the error value is written to *err. |
| 490 | * This can only happen for a write operation. |
| 491 | * |
| 492 | * The parameter write must be 1 if the offset will be used for a write |
| 493 | * operation (the block bitmaps is updated then), 0 otherwise. |
| 494 | * If write is true then err must not be NULL. |
| 495 | */ |
| 496 | static int64_t coroutine_fn GRAPH_RDLOCK |
| 497 | get_image_offset(BlockDriverState *bs, uint64_t offset, bool write, int *err) |
| 498 | { |
| 499 | BDRVVPCState *s = bs->opaque; |
| 500 | uint64_t bitmap_offset, block_offset; |
| 501 | uint32_t pagetable_index, offset_in_block; |
| 502 | |
| 503 | assert(!(write && err == NULL)); |
| 504 | |
| 505 | pagetable_index = offset / s->block_size; |
| 506 | offset_in_block = offset % s->block_size; |
| 507 | |
| 508 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
| 509 | return -1; /* not allocated */ |
| 510 | |
| 511 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
| 512 | block_offset = bitmap_offset + s->bitmap_size + offset_in_block; |
| 513 | |
| 514 | /* We must ensure that we don't write to any sectors which are marked as |
| 515 | unused in the bitmap. We get away with setting all bits in the block |
| 516 | bitmap each time we write to a new block. This might cause Virtual PC to |
| 517 | miss sparse read optimization, but it's not a problem in terms of |
| 518 | correctness. */ |
| 519 | if (write && (s->last_bitmap_offset != bitmap_offset)) { |
| 520 | g_autofree uint8_t *bitmap = g_malloc(s->bitmap_size); |
| 521 | int r; |
| 522 | |
| 523 | s->last_bitmap_offset = bitmap_offset; |
| 524 | memset(bitmap, 0xff, s->bitmap_size); |
| 525 | r = bdrv_co_pwrite_sync(bs->file, bitmap_offset, s->bitmap_size, bitmap, 0); |
| 526 | if (r < 0) { |
| 527 | *err = r; |
| 528 | return -2; |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | return block_offset; |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Writes the footer to the end of the image file. This is needed when the |
| 537 | * file grows as it overwrites the old footer |
| 538 | * |
| 539 | * Returns 0 on success and < 0 on error |
| 540 | */ |
| 541 | static int coroutine_fn GRAPH_RDLOCK rewrite_footer(BlockDriverState *bs) |
| 542 | { |
| 543 | int ret; |
| 544 | BDRVVPCState *s = bs->opaque; |
| 545 | int64_t offset = s->free_data_block_offset; |
| 546 | |
| 547 | ret = bdrv_co_pwrite_sync(bs->file, offset, sizeof(s->footer), &s->footer, 0); |
| 548 | if (ret < 0) |
| 549 | return ret; |
| 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Allocates a new block. This involves writing a new footer and updating |
| 556 | * the Block Allocation Table to use the space at the old end of the image |
| 557 | * file (overwriting the old footer) |
| 558 | * |
| 559 | * Returns the sectors' offset in the image file on success and < 0 on error |
| 560 | */ |
| 561 | static int64_t coroutine_fn GRAPH_RDLOCK |
| 562 | alloc_block(BlockDriverState *bs, int64_t offset) |
| 563 | { |
| 564 | BDRVVPCState *s = bs->opaque; |
| 565 | int64_t bat_offset; |
| 566 | uint32_t index, bat_value; |
| 567 | int ret; |
| 568 | g_autofree uint8_t *bitmap = g_malloc(s->bitmap_size); |
| 569 | |
| 570 | /* Check if sector_num is valid */ |
| 571 | if ((offset < 0) || (offset > bs->total_sectors * BDRV_SECTOR_SIZE)) { |
| 572 | return -EINVAL; |
| 573 | } |
| 574 | |
| 575 | /* Write entry into in-memory BAT */ |
| 576 | index = offset / s->block_size; |
| 577 | assert(s->pagetable[index] == 0xFFFFFFFF); |
| 578 | s->pagetable[index] = s->free_data_block_offset / 512; |
| 579 | |
| 580 | /* Initialize the block's bitmap */ |
| 581 | memset(bitmap, 0xff, s->bitmap_size); |
| 582 | ret = bdrv_co_pwrite_sync(bs->file, s->free_data_block_offset, |
| 583 | s->bitmap_size, bitmap, 0); |
| 584 | if (ret < 0) { |
| 585 | return ret; |
| 586 | } |
| 587 | |
| 588 | /* Write new footer (the old one will be overwritten) */ |
| 589 | s->free_data_block_offset += s->block_size + s->bitmap_size; |
| 590 | ret = rewrite_footer(bs); |
| 591 | if (ret < 0) |
| 592 | goto fail; |
| 593 | |
| 594 | /* Write BAT entry to disk */ |
| 595 | bat_offset = s->bat_offset + (4 * index); |
| 596 | bat_value = cpu_to_be32(s->pagetable[index]); |
| 597 | ret = bdrv_co_pwrite_sync(bs->file, bat_offset, 4, &bat_value, 0); |
| 598 | if (ret < 0) |
| 599 | goto fail; |
| 600 | |
| 601 | return get_image_offset(bs, offset, false, NULL); |
| 602 | |
| 603 | fail: |
| 604 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | static int coroutine_fn |
| 609 | vpc_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 610 | { |
| 611 | BDRVVPCState *s = (BDRVVPCState *)bs->opaque; |
| 612 | |
| 613 | if (be32_to_cpu(s->footer.type) != VHD_FIXED) { |
| 614 | bdi->cluster_size = s->block_size; |
| 615 | } |
| 616 | |
| 617 | return 0; |
| 618 | } |
| 619 | |
| 620 | static int coroutine_fn GRAPH_RDLOCK |
| 621 | vpc_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 622 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 623 | { |
| 624 | BDRVVPCState *s = bs->opaque; |
| 625 | int ret; |
| 626 | int64_t image_offset; |
| 627 | int64_t n_bytes; |
| 628 | int64_t bytes_done = 0; |
| 629 | QEMUIOVector local_qiov; |
| 630 | |
| 631 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
| 632 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, 0); |
| 633 | } |
| 634 | |
| 635 | qemu_co_mutex_lock(&s->lock); |
| 636 | qemu_iovec_init(&local_qiov, qiov->niov); |
| 637 | |
| 638 | while (bytes > 0) { |
| 639 | image_offset = get_image_offset(bs, offset, false, NULL); |
| 640 | n_bytes = MIN(bytes, s->block_size - (offset % s->block_size)); |
| 641 | |
| 642 | if (image_offset == -1) { |
| 643 | qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); |
| 644 | } else { |
| 645 | qemu_iovec_reset(&local_qiov); |
| 646 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); |
| 647 | |
| 648 | qemu_co_mutex_unlock(&s->lock); |
| 649 | ret = bdrv_co_preadv(bs->file, image_offset, n_bytes, |
| 650 | &local_qiov, 0); |
| 651 | qemu_co_mutex_lock(&s->lock); |
| 652 | if (ret < 0) { |
| 653 | goto fail; |
| 654 | } |
| 655 | } |
| 656 | |
| 657 | bytes -= n_bytes; |
| 658 | offset += n_bytes; |
| 659 | bytes_done += n_bytes; |
| 660 | } |
| 661 | |
| 662 | ret = 0; |
| 663 | fail: |
| 664 | qemu_iovec_destroy(&local_qiov); |
| 665 | qemu_co_mutex_unlock(&s->lock); |
| 666 | |
| 667 | return ret; |
| 668 | } |
| 669 | |
| 670 | static int coroutine_fn GRAPH_RDLOCK |
| 671 | vpc_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 672 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 673 | { |
| 674 | BDRVVPCState *s = bs->opaque; |
| 675 | int64_t image_offset; |
| 676 | int64_t n_bytes; |
| 677 | int64_t bytes_done = 0; |
| 678 | int ret = 0; |
| 679 | QEMUIOVector local_qiov; |
| 680 | |
| 681 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
| 682 | return bdrv_co_pwritev(bs->file, offset, bytes, qiov, 0); |
| 683 | } |
| 684 | |
| 685 | qemu_co_mutex_lock(&s->lock); |
| 686 | qemu_iovec_init(&local_qiov, qiov->niov); |
| 687 | |
| 688 | while (bytes > 0) { |
| 689 | image_offset = get_image_offset(bs, offset, true, &ret); |
| 690 | if (image_offset == -2) { |
| 691 | /* Failed to write block bitmap: can't proceed with write */ |
| 692 | goto fail; |
| 693 | } |
| 694 | n_bytes = MIN(bytes, s->block_size - (offset % s->block_size)); |
| 695 | |
| 696 | if (image_offset == -1) { |
| 697 | image_offset = alloc_block(bs, offset); |
| 698 | if (image_offset < 0) { |
| 699 | ret = image_offset; |
| 700 | goto fail; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | qemu_iovec_reset(&local_qiov); |
| 705 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); |
| 706 | |
| 707 | qemu_co_mutex_unlock(&s->lock); |
| 708 | ret = bdrv_co_pwritev(bs->file, image_offset, n_bytes, |
| 709 | &local_qiov, 0); |
| 710 | qemu_co_mutex_lock(&s->lock); |
| 711 | if (ret < 0) { |
| 712 | goto fail; |
| 713 | } |
| 714 | |
| 715 | bytes -= n_bytes; |
| 716 | offset += n_bytes; |
| 717 | bytes_done += n_bytes; |
| 718 | } |
| 719 | |
| 720 | ret = 0; |
| 721 | fail: |
| 722 | qemu_iovec_destroy(&local_qiov); |
| 723 | qemu_co_mutex_unlock(&s->lock); |
| 724 | |
| 725 | return ret; |
| 726 | } |
| 727 | |
| 728 | static int coroutine_fn GRAPH_RDLOCK |
| 729 | vpc_co_block_status(BlockDriverState *bs, unsigned int mode, |
| 730 | int64_t offset, int64_t bytes, |
| 731 | int64_t *pnum, int64_t *map, |
| 732 | BlockDriverState **file) |
| 733 | { |
| 734 | BDRVVPCState *s = bs->opaque; |
| 735 | int64_t image_offset; |
| 736 | bool allocated; |
| 737 | int ret; |
| 738 | int64_t n; |
| 739 | |
| 740 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
| 741 | *pnum = bytes; |
| 742 | *map = offset; |
| 743 | *file = bs->file->bs; |
| 744 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_RECURSE; |
| 745 | } |
| 746 | |
| 747 | qemu_co_mutex_lock(&s->lock); |
| 748 | |
| 749 | image_offset = get_image_offset(bs, offset, false, NULL); |
| 750 | allocated = (image_offset != -1); |
| 751 | *pnum = 0; |
| 752 | ret = BDRV_BLOCK_ZERO; |
| 753 | |
| 754 | do { |
| 755 | /* All sectors in a block are contiguous (without using the bitmap) */ |
| 756 | n = ROUND_UP(offset + 1, s->block_size) - offset; |
| 757 | n = MIN(n, bytes); |
| 758 | |
| 759 | *pnum += n; |
| 760 | offset += n; |
| 761 | bytes -= n; |
| 762 | /* *pnum can't be greater than one block for allocated |
| 763 | * sectors since there is always a bitmap in between. */ |
| 764 | if (allocated) { |
| 765 | *file = bs->file->bs; |
| 766 | *map = image_offset; |
| 767 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
| 768 | break; |
| 769 | } |
| 770 | if (bytes == 0) { |
| 771 | break; |
| 772 | } |
| 773 | image_offset = get_image_offset(bs, offset, false, NULL); |
| 774 | } while (image_offset == -1); |
| 775 | |
| 776 | qemu_co_mutex_unlock(&s->lock); |
| 777 | return ret; |
| 778 | } |
| 779 | |
| 780 | /* |
| 781 | * Calculates the number of cylinders, heads and sectors per cylinder |
| 782 | * based on a given number of sectors. This is the algorithm described |
| 783 | * in the VHD specification. |
| 784 | * |
| 785 | * Note that the geometry doesn't always exactly match total_sectors but |
| 786 | * may round it down. |
| 787 | * |
| 788 | * Returns 0 on success, -EFBIG if the size is larger than 2040 GiB. Override |
| 789 | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB) |
| 790 | * and instead allow up to 255 heads. |
| 791 | */ |
| 792 | static int calculate_geometry(int64_t total_sectors, uint16_t *cyls, |
| 793 | uint8_t *heads, uint8_t *secs_per_cyl) |
| 794 | { |
| 795 | uint32_t cyls_times_heads; |
| 796 | |
| 797 | total_sectors = MIN(total_sectors, VHD_MAX_GEOMETRY); |
| 798 | |
| 799 | if (total_sectors >= 65535LL * 16 * 63) { |
| 800 | *secs_per_cyl = 255; |
| 801 | *heads = 16; |
| 802 | cyls_times_heads = total_sectors / *secs_per_cyl; |
| 803 | } else { |
| 804 | *secs_per_cyl = 17; |
| 805 | cyls_times_heads = total_sectors / *secs_per_cyl; |
| 806 | *heads = DIV_ROUND_UP(cyls_times_heads, 1024); |
| 807 | |
| 808 | if (*heads < 4) { |
| 809 | *heads = 4; |
| 810 | } |
| 811 | |
| 812 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { |
| 813 | *secs_per_cyl = 31; |
| 814 | *heads = 16; |
| 815 | cyls_times_heads = total_sectors / *secs_per_cyl; |
| 816 | } |
| 817 | |
| 818 | if (cyls_times_heads >= (*heads * 1024)) { |
| 819 | *secs_per_cyl = 63; |
| 820 | *heads = 16; |
| 821 | cyls_times_heads = total_sectors / *secs_per_cyl; |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | *cyls = cyls_times_heads / *heads; |
| 826 | |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | static int coroutine_fn create_dynamic_disk(BlockBackend *blk, VHDFooter *footer, |
| 831 | int64_t total_sectors) |
| 832 | { |
| 833 | VHDDynDiskHeader dyndisk_header; |
| 834 | uint8_t bat_sector[512]; |
| 835 | size_t block_size, num_bat_entries; |
| 836 | int i; |
| 837 | int ret; |
| 838 | int64_t offset = 0; |
| 839 | |
| 840 | /* Write the footer (twice: at the beginning and at the end) */ |
| 841 | block_size = 0x200000; |
| 842 | num_bat_entries = DIV_ROUND_UP(total_sectors, block_size / 512); |
| 843 | |
| 844 | ret = blk_co_pwrite(blk, offset, sizeof(*footer), footer, 0); |
| 845 | if (ret < 0) { |
| 846 | goto fail; |
| 847 | } |
| 848 | |
| 849 | offset = 1536 + ((num_bat_entries * 4 + 511) & ~511); |
| 850 | ret = blk_co_pwrite(blk, offset, sizeof(*footer), footer, 0); |
| 851 | if (ret < 0) { |
| 852 | goto fail; |
| 853 | } |
| 854 | |
| 855 | /* Write the initial BAT */ |
| 856 | offset = 3 * 512; |
| 857 | |
| 858 | memset(bat_sector, 0xFF, 512); |
| 859 | for (i = 0; i < DIV_ROUND_UP(num_bat_entries * 4, 512); i++) { |
| 860 | ret = blk_co_pwrite(blk, offset, 512, bat_sector, 0); |
| 861 | if (ret < 0) { |
| 862 | goto fail; |
| 863 | } |
| 864 | offset += 512; |
| 865 | } |
| 866 | |
| 867 | /* Prepare the Dynamic Disk Header */ |
| 868 | memset(&dyndisk_header, 0, sizeof(dyndisk_header)); |
| 869 | |
| 870 | memcpy(dyndisk_header.magic, "cxsparse", 8); |
| 871 | |
| 872 | /* |
| 873 | * Note: The spec is actually wrong here for data_offset, it says |
| 874 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. |
| 875 | */ |
| 876 | dyndisk_header.data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
| 877 | dyndisk_header.table_offset = cpu_to_be64(3 * 512); |
| 878 | dyndisk_header.version = cpu_to_be32(0x00010000); |
| 879 | dyndisk_header.block_size = cpu_to_be32(block_size); |
| 880 | dyndisk_header.max_table_entries = cpu_to_be32(num_bat_entries); |
| 881 | |
| 882 | dyndisk_header.checksum = cpu_to_be32( |
| 883 | vpc_checksum(&dyndisk_header, sizeof(dyndisk_header))); |
| 884 | |
| 885 | /* Write the header */ |
| 886 | offset = 512; |
| 887 | |
| 888 | ret = blk_co_pwrite(blk, offset, sizeof(dyndisk_header), &dyndisk_header, 0); |
| 889 | if (ret < 0) { |
| 890 | goto fail; |
| 891 | } |
| 892 | |
| 893 | ret = 0; |
| 894 | fail: |
| 895 | return ret; |
| 896 | } |
| 897 | |
| 898 | static int coroutine_fn create_fixed_disk(BlockBackend *blk, VHDFooter *footer, |
| 899 | int64_t total_size, Error **errp) |
| 900 | { |
| 901 | int ret; |
| 902 | |
| 903 | /* Add footer to total size */ |
| 904 | total_size += sizeof(*footer); |
| 905 | |
| 906 | ret = blk_co_truncate(blk, total_size, false, PREALLOC_MODE_OFF, 0, errp); |
| 907 | if (ret < 0) { |
| 908 | return ret; |
| 909 | } |
| 910 | |
| 911 | ret = blk_co_pwrite(blk, total_size - sizeof(*footer), sizeof(*footer), |
| 912 | footer, 0); |
| 913 | if (ret < 0) { |
| 914 | error_setg_errno(errp, -ret, "Unable to write VHD header"); |
| 915 | return ret; |
| 916 | } |
| 917 | |
| 918 | return 0; |
| 919 | } |
| 920 | |
| 921 | static int calculate_rounded_image_size(BlockdevCreateOptionsVpc *vpc_opts, |
| 922 | uint16_t *out_cyls, |
| 923 | uint8_t *out_heads, |
| 924 | uint8_t *out_secs_per_cyl, |
| 925 | int64_t *out_total_sectors, |
| 926 | Error **errp) |
| 927 | { |
| 928 | int64_t total_size = vpc_opts->size; |
| 929 | uint16_t cyls = 0; |
| 930 | uint8_t heads = 0; |
| 931 | uint8_t secs_per_cyl = 0; |
| 932 | int64_t total_sectors; |
| 933 | int i; |
| 934 | |
| 935 | /* |
| 936 | * Calculate matching total_size and geometry. Increase the number of |
| 937 | * sectors requested until we get enough (or fail). This ensures that |
| 938 | * qemu-img convert doesn't truncate images, but rather rounds up. |
| 939 | * |
| 940 | * If the image size can't be represented by a spec conformant CHS geometry, |
| 941 | * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use |
| 942 | * the image size from the VHD footer to calculate total_sectors. |
| 943 | */ |
| 944 | if (vpc_opts->force_size) { |
| 945 | /* This will force the use of total_size for sector count, below */ |
| 946 | cyls = VHD_CHS_MAX_C; |
| 947 | heads = VHD_CHS_MAX_H; |
| 948 | secs_per_cyl = VHD_CHS_MAX_S; |
| 949 | } else { |
| 950 | total_sectors = MIN(VHD_MAX_GEOMETRY, total_size / BDRV_SECTOR_SIZE); |
| 951 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { |
| 952 | calculate_geometry(total_sectors + i, &cyls, &heads, &secs_per_cyl); |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | if ((int64_t)cyls * heads * secs_per_cyl == VHD_MAX_GEOMETRY) { |
| 957 | total_sectors = total_size / BDRV_SECTOR_SIZE; |
| 958 | /* Allow a maximum disk size of 2040 GiB */ |
| 959 | if (total_sectors > VHD_MAX_SECTORS) { |
| 960 | error_setg(errp, "Disk size is too large, max size is 2040 GiB"); |
| 961 | return -EFBIG; |
| 962 | } |
| 963 | } else { |
| 964 | total_sectors = (int64_t) cyls * heads * secs_per_cyl; |
| 965 | } |
| 966 | |
| 967 | *out_total_sectors = total_sectors; |
| 968 | if (out_cyls) { |
| 969 | *out_cyls = cyls; |
| 970 | *out_heads = heads; |
| 971 | *out_secs_per_cyl = secs_per_cyl; |
| 972 | } |
| 973 | |
| 974 | return 0; |
| 975 | } |
| 976 | |
| 977 | static int coroutine_fn GRAPH_UNLOCKED |
| 978 | vpc_co_create(BlockdevCreateOptions *opts, Error **errp) |
| 979 | { |
| 980 | BlockdevCreateOptionsVpc *vpc_opts; |
| 981 | BlockBackend *blk = NULL; |
| 982 | BlockDriverState *bs = NULL; |
| 983 | |
| 984 | VHDFooter footer; |
| 985 | uint16_t cyls = 0; |
| 986 | uint8_t heads = 0; |
| 987 | uint8_t secs_per_cyl = 0; |
| 988 | int64_t total_sectors; |
| 989 | int64_t total_size; |
| 990 | int disk_type; |
| 991 | int ret = -EIO; |
| 992 | QemuUUID uuid; |
| 993 | |
| 994 | assert(opts->driver == BLOCKDEV_DRIVER_VPC); |
| 995 | vpc_opts = &opts->u.vpc; |
| 996 | |
| 997 | /* Validate options and set default values */ |
| 998 | total_size = vpc_opts->size; |
| 999 | |
| 1000 | if (!vpc_opts->has_subformat) { |
| 1001 | vpc_opts->subformat = BLOCKDEV_VPC_SUBFORMAT_DYNAMIC; |
| 1002 | } |
| 1003 | switch (vpc_opts->subformat) { |
| 1004 | case BLOCKDEV_VPC_SUBFORMAT_DYNAMIC: |
| 1005 | disk_type = VHD_DYNAMIC; |
| 1006 | break; |
| 1007 | case BLOCKDEV_VPC_SUBFORMAT_FIXED: |
| 1008 | disk_type = VHD_FIXED; |
| 1009 | break; |
| 1010 | default: |
| 1011 | g_assert_not_reached(); |
| 1012 | } |
| 1013 | |
| 1014 | /* Create BlockBackend to write to the image */ |
| 1015 | bs = bdrv_co_open_blockdev_ref(vpc_opts->file, errp); |
| 1016 | if (bs == NULL) { |
| 1017 | return -EIO; |
| 1018 | } |
| 1019 | |
| 1020 | blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, |
| 1021 | errp); |
| 1022 | if (!blk) { |
| 1023 | ret = -EPERM; |
| 1024 | goto out; |
| 1025 | } |
| 1026 | blk_set_allow_write_beyond_eof(blk, true); |
| 1027 | |
| 1028 | /* Get geometry and check that it matches the image size*/ |
| 1029 | ret = calculate_rounded_image_size(vpc_opts, &cyls, &heads, &secs_per_cyl, |
| 1030 | &total_sectors, errp); |
| 1031 | if (ret < 0) { |
| 1032 | goto out; |
| 1033 | } |
| 1034 | |
| 1035 | if (total_size != total_sectors * BDRV_SECTOR_SIZE) { |
| 1036 | error_setg(errp, "The requested image size cannot be represented in " |
| 1037 | "CHS geometry"); |
| 1038 | error_append_hint(errp, "Try size=%llu or force-size=on (the " |
| 1039 | "latter makes the image incompatible with " |
| 1040 | "Virtual PC)", |
| 1041 | total_sectors * BDRV_SECTOR_SIZE); |
| 1042 | ret = -EINVAL; |
| 1043 | goto out; |
| 1044 | } |
| 1045 | |
| 1046 | /* Prepare the Hard Disk Footer */ |
| 1047 | memset(&footer, 0, sizeof(footer)); |
| 1048 | |
| 1049 | memcpy(footer.creator, "conectix", 8); |
| 1050 | if (vpc_opts->force_size) { |
| 1051 | memcpy(footer.creator_app, "qem2", 4); |
| 1052 | } else { |
| 1053 | memcpy(footer.creator_app, "qemu", 4); |
| 1054 | } |
| 1055 | memcpy(footer.creator_os, "Wi2k", 4); |
| 1056 | |
| 1057 | footer.features = cpu_to_be32(0x02); |
| 1058 | footer.version = cpu_to_be32(0x00010000); |
| 1059 | if (disk_type == VHD_DYNAMIC) { |
| 1060 | footer.data_offset = cpu_to_be64(sizeof(footer)); |
| 1061 | } else { |
| 1062 | footer.data_offset = cpu_to_be64(0xFFFFFFFFFFFFFFFFULL); |
| 1063 | } |
| 1064 | footer.timestamp = cpu_to_be32(time(NULL) - VHD_TIMESTAMP_BASE); |
| 1065 | |
| 1066 | /* Version of Virtual PC 2007 */ |
| 1067 | footer.major = cpu_to_be16(0x0005); |
| 1068 | footer.minor = cpu_to_be16(0x0003); |
| 1069 | footer.orig_size = cpu_to_be64(total_size); |
| 1070 | footer.current_size = cpu_to_be64(total_size); |
| 1071 | footer.cyls = cpu_to_be16(cyls); |
| 1072 | footer.heads = heads; |
| 1073 | footer.secs_per_cyl = secs_per_cyl; |
| 1074 | |
| 1075 | footer.type = cpu_to_be32(disk_type); |
| 1076 | |
| 1077 | qemu_uuid_generate(&uuid); |
| 1078 | footer.uuid = uuid; |
| 1079 | |
| 1080 | footer.checksum = cpu_to_be32(vpc_checksum(&footer, sizeof(footer))); |
| 1081 | |
| 1082 | if (disk_type == VHD_DYNAMIC) { |
| 1083 | ret = create_dynamic_disk(blk, &footer, total_sectors); |
| 1084 | if (ret < 0) { |
| 1085 | error_setg(errp, "Unable to create or write VHD header"); |
| 1086 | } |
| 1087 | } else { |
| 1088 | ret = create_fixed_disk(blk, &footer, total_size, errp); |
| 1089 | } |
| 1090 | |
| 1091 | out: |
| 1092 | blk_co_unref(blk); |
| 1093 | bdrv_co_unref(bs); |
| 1094 | return ret; |
| 1095 | } |
| 1096 | |
| 1097 | static int coroutine_fn GRAPH_UNLOCKED |
| 1098 | vpc_co_create_opts(BlockDriver *drv, const char *filename, |
| 1099 | QemuOpts *opts, Error **errp) |
| 1100 | { |
| 1101 | BlockdevCreateOptions *create_options = NULL; |
| 1102 | QDict *qdict; |
| 1103 | Visitor *v; |
| 1104 | BlockDriverState *bs = NULL; |
| 1105 | int ret; |
| 1106 | |
| 1107 | static const QDictRenames opt_renames[] = { |
| 1108 | { VPC_OPT_FORCE_SIZE, "force-size" }, |
| 1109 | { NULL, NULL }, |
| 1110 | }; |
| 1111 | |
| 1112 | /* Parse options and convert legacy syntax */ |
| 1113 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vpc_create_opts, true); |
| 1114 | |
| 1115 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { |
| 1116 | ret = -EINVAL; |
| 1117 | goto fail; |
| 1118 | } |
| 1119 | |
| 1120 | /* Create and open the file (protocol layer) */ |
| 1121 | ret = bdrv_co_create_file(filename, opts, true, errp); |
| 1122 | if (ret < 0) { |
| 1123 | goto fail; |
| 1124 | } |
| 1125 | |
| 1126 | bs = bdrv_co_open(filename, NULL, NULL, |
| 1127 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); |
| 1128 | if (bs == NULL) { |
| 1129 | ret = -EIO; |
| 1130 | goto fail; |
| 1131 | } |
| 1132 | |
| 1133 | /* Now get the QAPI type BlockdevCreateOptions */ |
| 1134 | qdict_put_str(qdict, "driver", "vpc"); |
| 1135 | qdict_put_str(qdict, "file", bs->node_name); |
| 1136 | |
| 1137 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
| 1138 | if (!v) { |
| 1139 | ret = -EINVAL; |
| 1140 | goto fail; |
| 1141 | } |
| 1142 | |
| 1143 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
| 1144 | visit_free(v); |
| 1145 | if (!create_options) { |
| 1146 | ret = -EINVAL; |
| 1147 | goto fail; |
| 1148 | } |
| 1149 | |
| 1150 | /* Silently round up size */ |
| 1151 | assert(create_options->driver == BLOCKDEV_DRIVER_VPC); |
| 1152 | create_options->u.vpc.size = |
| 1153 | ROUND_UP(create_options->u.vpc.size, BDRV_SECTOR_SIZE); |
| 1154 | |
| 1155 | if (!create_options->u.vpc.force_size) { |
| 1156 | int64_t total_sectors; |
| 1157 | ret = calculate_rounded_image_size(&create_options->u.vpc, NULL, NULL, |
| 1158 | NULL, &total_sectors, errp); |
| 1159 | if (ret < 0) { |
| 1160 | goto fail; |
| 1161 | } |
| 1162 | |
| 1163 | create_options->u.vpc.size = total_sectors * BDRV_SECTOR_SIZE; |
| 1164 | } |
| 1165 | |
| 1166 | |
| 1167 | /* Create the vpc image (format layer) */ |
| 1168 | ret = vpc_co_create(create_options, errp); |
| 1169 | |
| 1170 | fail: |
| 1171 | qobject_unref(qdict); |
| 1172 | bdrv_co_unref(bs); |
| 1173 | qapi_free_BlockdevCreateOptions(create_options); |
| 1174 | return ret; |
| 1175 | } |
| 1176 | |
| 1177 | |
| 1178 | static int GRAPH_RDLOCK vpc_has_zero_init(BlockDriverState *bs) |
| 1179 | { |
| 1180 | BDRVVPCState *s = bs->opaque; |
| 1181 | |
| 1182 | if (be32_to_cpu(s->footer.type) == VHD_FIXED) { |
| 1183 | return bdrv_has_zero_init(bs->file->bs); |
| 1184 | } else { |
| 1185 | return 1; |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | static void vpc_close(BlockDriverState *bs) |
| 1190 | { |
| 1191 | BDRVVPCState *s = bs->opaque; |
| 1192 | qemu_vfree(s->pagetable); |
| 1193 | #ifdef CACHE |
| 1194 | g_free(s->pageentry_u8); |
| 1195 | #endif |
| 1196 | |
| 1197 | migrate_del_blocker(&s->migration_blocker); |
| 1198 | } |
| 1199 | |
| 1200 | static QemuOptsList vpc_create_opts = { |
| 1201 | .name = "vpc-create-opts", |
| 1202 | .head = QTAILQ_HEAD_INITIALIZER(vpc_create_opts.head), |
| 1203 | .desc = { |
| 1204 | { |
| 1205 | .name = BLOCK_OPT_SIZE, |
| 1206 | .type = QEMU_OPT_SIZE, |
| 1207 | .help = "Virtual disk size" |
| 1208 | }, |
| 1209 | { |
| 1210 | .name = BLOCK_OPT_SUBFMT, |
| 1211 | .type = QEMU_OPT_STRING, |
| 1212 | .help = |
| 1213 | "Type of virtual hard disk format. Supported formats are " |
| 1214 | "{dynamic (default) | fixed} " |
| 1215 | }, |
| 1216 | { |
| 1217 | .name = VPC_OPT_FORCE_SIZE, |
| 1218 | .type = QEMU_OPT_BOOL, |
| 1219 | .help = "Force disk size calculation to use the actual size " |
| 1220 | "specified, rather than using the nearest CHS-based " |
| 1221 | "calculation" |
| 1222 | }, |
| 1223 | { /* end of list */ } |
| 1224 | } |
| 1225 | }; |
| 1226 | |
| 1227 | static const char *const vpc_strong_runtime_opts[] = { |
| 1228 | VPC_OPT_SIZE_CALC, |
| 1229 | |
| 1230 | NULL |
| 1231 | }; |
| 1232 | |
| 1233 | static BlockDriver bdrv_vpc = { |
| 1234 | .format_name = "vpc", |
| 1235 | .instance_size = sizeof(BDRVVPCState), |
| 1236 | |
| 1237 | .bdrv_probe = vpc_probe, |
| 1238 | .bdrv_open = vpc_open, |
| 1239 | .bdrv_close = vpc_close, |
| 1240 | .bdrv_reopen_prepare = vpc_reopen_prepare, |
| 1241 | .bdrv_child_perm = bdrv_default_perms, |
| 1242 | .bdrv_co_create = vpc_co_create, |
| 1243 | .bdrv_co_create_opts = vpc_co_create_opts, |
| 1244 | |
| 1245 | .bdrv_co_preadv = vpc_co_preadv, |
| 1246 | .bdrv_co_pwritev = vpc_co_pwritev, |
| 1247 | .bdrv_co_block_status = vpc_co_block_status, |
| 1248 | |
| 1249 | .bdrv_co_get_info = vpc_co_get_info, |
| 1250 | |
| 1251 | .is_format = true, |
| 1252 | .create_opts = &vpc_create_opts, |
| 1253 | .bdrv_has_zero_init = vpc_has_zero_init, |
| 1254 | .strong_runtime_opts = vpc_strong_runtime_opts, |
| 1255 | }; |
| 1256 | |
| 1257 | static void bdrv_vpc_init(void) |
| 1258 | { |
| 1259 | bdrv_register(&bdrv_vpc); |
| 1260 | } |
| 1261 | |
| 1262 | block_init(bdrv_vpc_init); |