| 1 | /* |
| 2 | * Block driver for the Virtual Disk Image (VDI) format |
| 3 | * |
| 4 | * Copyright (c) 2009, 2012 Stefan Weil |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | * |
| 8 | * This program is free software: you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation, either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | * |
| 21 | * Reference: |
| 22 | * http://forums.virtualbox.org/viewtopic.php?t=8046 |
| 23 | * |
| 24 | * This driver supports create / read / write operations on VDI images. |
| 25 | * |
| 26 | * Todo (see also TODO in code): |
| 27 | * |
| 28 | * Some features like snapshots are still missing. |
| 29 | * |
| 30 | * Deallocation of zero-filled blocks and shrinking images are missing, too |
| 31 | * (might be added to common block layer). |
| 32 | * |
| 33 | * Allocation of blocks could be optimized (less writes to block map and |
| 34 | * header). |
| 35 | * |
| 36 | * Read and write of adjacent blocks could be done in one operation |
| 37 | * (current code uses one operation per block (1 MiB). |
| 38 | * |
| 39 | * The code is not thread safe (missing locks for changes in header and |
| 40 | * block table, no problem with current QEMU). |
| 41 | * |
| 42 | * Hints: |
| 43 | * |
| 44 | * Blocks (VDI documentation) correspond to clusters (QEMU). |
| 45 | * QEMU's backing files could be implemented using VDI snapshot files (TODO). |
| 46 | * VDI snapshot files may also contain the complete machine state. |
| 47 | * Maybe this machine state can be converted to QEMU PC machine snapshot data. |
| 48 | * |
| 49 | * The driver keeps a block cache (little endian entries) in memory. |
| 50 | * For the standard block size (1 MiB), a 1 TiB disk will use 4 MiB RAM, |
| 51 | * so this seems to be reasonable. |
| 52 | */ |
| 53 | |
| 54 | #include "qemu/osdep.h" |
| 55 | #include "qemu/units.h" |
| 56 | #include "qapi/error.h" |
| 57 | #include "qapi/qobject-input-visitor.h" |
| 58 | #include "qapi/qapi-visit-block-core.h" |
| 59 | #include "block/block_int.h" |
| 60 | #include "block/qdict.h" |
| 61 | #include "system/block-backend.h" |
| 62 | #include "qemu/module.h" |
| 63 | #include "qemu/option.h" |
| 64 | #include "qemu/bswap.h" |
| 65 | #include "migration/blocker.h" |
| 66 | #include "qemu/coroutine.h" |
| 67 | #include "qemu/cutils.h" |
| 68 | #include "qemu/uuid.h" |
| 69 | #include "qemu/memalign.h" |
| 70 | |
| 71 | /* Code configuration options. */ |
| 72 | |
| 73 | /* Enable debug messages. */ |
| 74 | //~ #define CONFIG_VDI_DEBUG |
| 75 | |
| 76 | /* Support write operations on VDI images. */ |
| 77 | #define CONFIG_VDI_WRITE |
| 78 | |
| 79 | /* Support non-standard block (cluster) size. This is untested. |
| 80 | * Maybe it will be needed for very large images. |
| 81 | */ |
| 82 | //~ #define CONFIG_VDI_BLOCK_SIZE |
| 83 | |
| 84 | /* Support static (fixed, pre-allocated) images. */ |
| 85 | #define CONFIG_VDI_STATIC_IMAGE |
| 86 | |
| 87 | /* Command line option for static images. */ |
| 88 | #define BLOCK_OPT_STATIC "static" |
| 89 | |
| 90 | #define SECTOR_SIZE 512ULL |
| 91 | #define DEFAULT_CLUSTER_SIZE 1048576 |
| 92 | /* Note: can't use 1 * MiB, because it's passed to stringify() */ |
| 93 | |
| 94 | #if defined(CONFIG_VDI_DEBUG) |
| 95 | #define VDI_DEBUG 1 |
| 96 | #else |
| 97 | #define VDI_DEBUG 0 |
| 98 | #endif |
| 99 | |
| 100 | #define logout(fmt, ...) \ |
| 101 | do { \ |
| 102 | if (VDI_DEBUG) { \ |
| 103 | fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__); \ |
| 104 | } \ |
| 105 | } while (0) |
| 106 | |
| 107 | /* Image signature. */ |
| 108 | #define VDI_SIGNATURE 0xbeda107f |
| 109 | |
| 110 | /* Image version. */ |
| 111 | #define VDI_VERSION_1_1 0x00010001 |
| 112 | |
| 113 | /* Image type. */ |
| 114 | #define VDI_TYPE_DYNAMIC 1 |
| 115 | #define VDI_TYPE_STATIC 2 |
| 116 | |
| 117 | /* Innotek / SUN images use these strings in header.text: |
| 118 | * "<<< innotek VirtualBox Disk Image >>>\n" |
| 119 | * "<<< Sun xVM VirtualBox Disk Image >>>\n" |
| 120 | * "<<< Sun VirtualBox Disk Image >>>\n" |
| 121 | * The value does not matter, so QEMU created images use a different text. |
| 122 | */ |
| 123 | #define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n" |
| 124 | |
| 125 | /* A never-allocated block; semantically arbitrary content. */ |
| 126 | #define VDI_UNALLOCATED 0xffffffffU |
| 127 | |
| 128 | /* A discarded (no longer allocated) block; semantically zero-filled. */ |
| 129 | #define VDI_DISCARDED 0xfffffffeU |
| 130 | |
| 131 | #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED) |
| 132 | |
| 133 | /* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since |
| 134 | * the bmap is read and written in a single operation, its size needs to be |
| 135 | * limited to INT_MAX; furthermore, when opening an image, the bmap size is |
| 136 | * rounded up to be aligned on BDRV_SECTOR_SIZE. |
| 137 | * Therefore this should satisfy the following: |
| 138 | * VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1 |
| 139 | * (INT_MAX + 1 is the first value not representable as an int) |
| 140 | * This guarantees that any value below or equal to the constant will, when |
| 141 | * multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary, |
| 142 | * still be below or equal to INT_MAX. */ |
| 143 | #define VDI_BLOCKS_IN_IMAGE_MAX \ |
| 144 | ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t))) |
| 145 | #define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \ |
| 146 | (uint64_t)DEFAULT_CLUSTER_SIZE) |
| 147 | |
| 148 | static QemuOptsList vdi_create_opts; |
| 149 | |
| 150 | typedef struct { |
| 151 | char text[0x40]; |
| 152 | uint32_t signature; |
| 153 | uint32_t version; |
| 154 | uint32_t header_size; |
| 155 | uint32_t image_type; |
| 156 | uint32_t image_flags; |
| 157 | char description[256]; |
| 158 | uint32_t offset_bmap; |
| 159 | uint32_t offset_data; |
| 160 | uint32_t cylinders; /* disk geometry, unused here */ |
| 161 | uint32_t heads; /* disk geometry, unused here */ |
| 162 | uint32_t sectors; /* disk geometry, unused here */ |
| 163 | uint32_t sector_size; |
| 164 | uint32_t unused1; |
| 165 | uint64_t disk_size; |
| 166 | uint32_t block_size; |
| 167 | uint32_t block_extra; /* unused here */ |
| 168 | uint32_t blocks_in_image; |
| 169 | uint32_t blocks_allocated; |
| 170 | QemuUUID uuid_image; |
| 171 | QemuUUID uuid_last_snap; |
| 172 | QemuUUID uuid_link; |
| 173 | QemuUUID uuid_parent; |
| 174 | uint64_t unused2[7]; |
| 175 | } QEMU_PACKED VdiHeader; |
| 176 | |
| 177 | QEMU_BUILD_BUG_ON(sizeof(VdiHeader) != 512); |
| 178 | |
| 179 | typedef struct { |
| 180 | /* The block map entries are little endian (even in memory). */ |
| 181 | uint32_t *bmap; |
| 182 | /* Size of block (bytes). */ |
| 183 | uint32_t block_size; |
| 184 | /* First sector of block map. */ |
| 185 | uint32_t bmap_sector; |
| 186 | /* VDI header (converted to host endianness). */ |
| 187 | VdiHeader header; |
| 188 | |
| 189 | CoRwlock bmap_lock; |
| 190 | |
| 191 | Error *migration_blocker; |
| 192 | } BDRVVdiState; |
| 193 | |
| 194 | static void vdi_header_to_cpu(VdiHeader *header) |
| 195 | { |
| 196 | header->signature = le32_to_cpu(header->signature); |
| 197 | header->version = le32_to_cpu(header->version); |
| 198 | header->header_size = le32_to_cpu(header->header_size); |
| 199 | header->image_type = le32_to_cpu(header->image_type); |
| 200 | header->image_flags = le32_to_cpu(header->image_flags); |
| 201 | header->offset_bmap = le32_to_cpu(header->offset_bmap); |
| 202 | header->offset_data = le32_to_cpu(header->offset_data); |
| 203 | header->cylinders = le32_to_cpu(header->cylinders); |
| 204 | header->heads = le32_to_cpu(header->heads); |
| 205 | header->sectors = le32_to_cpu(header->sectors); |
| 206 | header->sector_size = le32_to_cpu(header->sector_size); |
| 207 | header->disk_size = le64_to_cpu(header->disk_size); |
| 208 | header->block_size = le32_to_cpu(header->block_size); |
| 209 | header->block_extra = le32_to_cpu(header->block_extra); |
| 210 | header->blocks_in_image = le32_to_cpu(header->blocks_in_image); |
| 211 | header->blocks_allocated = le32_to_cpu(header->blocks_allocated); |
| 212 | header->uuid_image = qemu_uuid_bswap(header->uuid_image); |
| 213 | header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap); |
| 214 | header->uuid_link = qemu_uuid_bswap(header->uuid_link); |
| 215 | header->uuid_parent = qemu_uuid_bswap(header->uuid_parent); |
| 216 | } |
| 217 | |
| 218 | static void vdi_header_to_le(VdiHeader *header) |
| 219 | { |
| 220 | header->signature = cpu_to_le32(header->signature); |
| 221 | header->version = cpu_to_le32(header->version); |
| 222 | header->header_size = cpu_to_le32(header->header_size); |
| 223 | header->image_type = cpu_to_le32(header->image_type); |
| 224 | header->image_flags = cpu_to_le32(header->image_flags); |
| 225 | header->offset_bmap = cpu_to_le32(header->offset_bmap); |
| 226 | header->offset_data = cpu_to_le32(header->offset_data); |
| 227 | header->cylinders = cpu_to_le32(header->cylinders); |
| 228 | header->heads = cpu_to_le32(header->heads); |
| 229 | header->sectors = cpu_to_le32(header->sectors); |
| 230 | header->sector_size = cpu_to_le32(header->sector_size); |
| 231 | header->disk_size = cpu_to_le64(header->disk_size); |
| 232 | header->block_size = cpu_to_le32(header->block_size); |
| 233 | header->block_extra = cpu_to_le32(header->block_extra); |
| 234 | header->blocks_in_image = cpu_to_le32(header->blocks_in_image); |
| 235 | header->blocks_allocated = cpu_to_le32(header->blocks_allocated); |
| 236 | header->uuid_image = qemu_uuid_bswap(header->uuid_image); |
| 237 | header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap); |
| 238 | header->uuid_link = qemu_uuid_bswap(header->uuid_link); |
| 239 | header->uuid_parent = qemu_uuid_bswap(header->uuid_parent); |
| 240 | } |
| 241 | |
| 242 | static void vdi_header_print(VdiHeader *header) |
| 243 | { |
| 244 | char uuidstr[UUID_STR_LEN]; |
| 245 | QemuUUID uuid; |
| 246 | logout("text %s", header->text); |
| 247 | logout("signature 0x%08x\n", header->signature); |
| 248 | logout("header size 0x%04x\n", header->header_size); |
| 249 | logout("image type 0x%04x\n", header->image_type); |
| 250 | logout("image flags 0x%04x\n", header->image_flags); |
| 251 | logout("description %s\n", header->description); |
| 252 | logout("offset bmap 0x%04x\n", header->offset_bmap); |
| 253 | logout("offset data 0x%04x\n", header->offset_data); |
| 254 | logout("cylinders 0x%04x\n", header->cylinders); |
| 255 | logout("heads 0x%04x\n", header->heads); |
| 256 | logout("sectors 0x%04x\n", header->sectors); |
| 257 | logout("sector size 0x%04x\n", header->sector_size); |
| 258 | logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n", |
| 259 | header->disk_size, header->disk_size / MiB); |
| 260 | logout("block size 0x%04x\n", header->block_size); |
| 261 | logout("block extra 0x%04x\n", header->block_extra); |
| 262 | logout("blocks tot. 0x%04x\n", header->blocks_in_image); |
| 263 | logout("blocks all. 0x%04x\n", header->blocks_allocated); |
| 264 | uuid = header->uuid_image; |
| 265 | qemu_uuid_unparse(&uuid, uuidstr); |
| 266 | logout("uuid image %s\n", uuidstr); |
| 267 | uuid = header->uuid_last_snap; |
| 268 | qemu_uuid_unparse(&uuid, uuidstr); |
| 269 | logout("uuid snap %s\n", uuidstr); |
| 270 | uuid = header->uuid_link; |
| 271 | qemu_uuid_unparse(&uuid, uuidstr); |
| 272 | logout("uuid link %s\n", uuidstr); |
| 273 | uuid = header->uuid_parent; |
| 274 | qemu_uuid_unparse(&uuid, uuidstr); |
| 275 | logout("uuid parent %s\n", uuidstr); |
| 276 | } |
| 277 | |
| 278 | static int coroutine_fn vdi_co_check(BlockDriverState *bs, BdrvCheckResult *res, |
| 279 | BdrvCheckMode fix) |
| 280 | { |
| 281 | /* TODO: additional checks possible. */ |
| 282 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; |
| 283 | uint32_t blocks_allocated = 0; |
| 284 | uint32_t block; |
| 285 | uint32_t *bmap; |
| 286 | logout("\n"); |
| 287 | |
| 288 | if (fix) { |
| 289 | return -ENOTSUP; |
| 290 | } |
| 291 | |
| 292 | bmap = g_try_new(uint32_t, s->header.blocks_in_image); |
| 293 | if (s->header.blocks_in_image && bmap == NULL) { |
| 294 | res->check_errors++; |
| 295 | return -ENOMEM; |
| 296 | } |
| 297 | |
| 298 | memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t)); |
| 299 | |
| 300 | /* Check block map and value of blocks_allocated. */ |
| 301 | for (block = 0; block < s->header.blocks_in_image; block++) { |
| 302 | uint32_t bmap_entry = le32_to_cpu(s->bmap[block]); |
| 303 | if (VDI_IS_ALLOCATED(bmap_entry)) { |
| 304 | if (bmap_entry < s->header.blocks_in_image) { |
| 305 | blocks_allocated++; |
| 306 | if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) { |
| 307 | bmap[bmap_entry] = bmap_entry; |
| 308 | } else { |
| 309 | fprintf(stderr, "ERROR: block index %" PRIu32 |
| 310 | " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry); |
| 311 | res->corruptions++; |
| 312 | } |
| 313 | } else { |
| 314 | fprintf(stderr, "ERROR: block index %" PRIu32 |
| 315 | " too large, is %" PRIu32 "\n", block, bmap_entry); |
| 316 | res->corruptions++; |
| 317 | } |
| 318 | } |
| 319 | } |
| 320 | if (blocks_allocated != s->header.blocks_allocated) { |
| 321 | fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32 |
| 322 | ", should be %" PRIu32 "\n", |
| 323 | blocks_allocated, s->header.blocks_allocated); |
| 324 | res->corruptions++; |
| 325 | } |
| 326 | |
| 327 | g_free(bmap); |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static int coroutine_fn |
| 333 | vdi_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 334 | { |
| 335 | /* TODO: vdi_co_get_info would be needed for machine snapshots. |
| 336 | vm_state_offset is still missing. */ |
| 337 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; |
| 338 | logout("\n"); |
| 339 | bdi->cluster_size = s->block_size; |
| 340 | bdi->vm_state_offset = 0; |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | static int vdi_make_empty(BlockDriverState *bs) |
| 345 | { |
| 346 | /* TODO: missing code. */ |
| 347 | logout("\n"); |
| 348 | /* The return value for missing code must be 0, see block.c. */ |
| 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 353 | { |
| 354 | const VdiHeader *header = (const VdiHeader *)buf; |
| 355 | int ret = 0; |
| 356 | |
| 357 | logout("\n"); |
| 358 | |
| 359 | if (buf_size < sizeof(*header)) { |
| 360 | /* Header too small, no VDI. */ |
| 361 | } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) { |
| 362 | ret = 100; |
| 363 | } |
| 364 | |
| 365 | if (ret == 0) { |
| 366 | logout("no vdi image\n"); |
| 367 | } else { |
| 368 | logout("%s", header->text); |
| 369 | } |
| 370 | |
| 371 | return ret; |
| 372 | } |
| 373 | |
| 374 | static int vdi_open(BlockDriverState *bs, QDict *options, int flags, |
| 375 | Error **errp) |
| 376 | { |
| 377 | BDRVVdiState *s = bs->opaque; |
| 378 | VdiHeader header; |
| 379 | size_t bmap_size; |
| 380 | int ret; |
| 381 | QemuUUID uuid_link, uuid_parent; |
| 382 | |
| 383 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
| 384 | if (ret < 0) { |
| 385 | return ret; |
| 386 | } |
| 387 | |
| 388 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
| 389 | |
| 390 | logout("\n"); |
| 391 | |
| 392 | ret = bdrv_pread(bs->file, 0, sizeof(header), &header, 0); |
| 393 | if (ret < 0) { |
| 394 | goto fail; |
| 395 | } |
| 396 | |
| 397 | vdi_header_to_cpu(&header); |
| 398 | if (VDI_DEBUG) { |
| 399 | vdi_header_print(&header); |
| 400 | } |
| 401 | |
| 402 | if (header.disk_size > VDI_DISK_SIZE_MAX) { |
| 403 | error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 |
| 404 | ", max supported is 0x%" PRIx64 ")", |
| 405 | header.disk_size, VDI_DISK_SIZE_MAX); |
| 406 | ret = -ENOTSUP; |
| 407 | goto fail; |
| 408 | } |
| 409 | |
| 410 | uuid_link = header.uuid_link; |
| 411 | uuid_parent = header.uuid_parent; |
| 412 | |
| 413 | if (header.disk_size % SECTOR_SIZE != 0) { |
| 414 | /* 'VBoxManage convertfromraw' can create images with odd disk sizes. |
| 415 | We accept them but round the disk size to the next multiple of |
| 416 | SECTOR_SIZE. */ |
| 417 | logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size); |
| 418 | header.disk_size = ROUND_UP(header.disk_size, SECTOR_SIZE); |
| 419 | } |
| 420 | |
| 421 | if (header.signature != VDI_SIGNATURE) { |
| 422 | error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32 |
| 423 | ")", header.signature); |
| 424 | ret = -EINVAL; |
| 425 | goto fail; |
| 426 | } else if (header.version != VDI_VERSION_1_1) { |
| 427 | error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32 |
| 428 | ")", header.version >> 16, header.version & 0xffff); |
| 429 | ret = -ENOTSUP; |
| 430 | goto fail; |
| 431 | } else if (header.offset_bmap % SECTOR_SIZE != 0) { |
| 432 | /* We only support block maps which start on a sector boundary. */ |
| 433 | error_setg(errp, "unsupported VDI image (unaligned block map offset " |
| 434 | "0x%" PRIx32 ")", header.offset_bmap); |
| 435 | ret = -ENOTSUP; |
| 436 | goto fail; |
| 437 | } else if (header.offset_data % SECTOR_SIZE != 0) { |
| 438 | /* We only support data blocks which start on a sector boundary. */ |
| 439 | error_setg(errp, "unsupported VDI image (unaligned data offset 0x%" |
| 440 | PRIx32 ")", header.offset_data); |
| 441 | ret = -ENOTSUP; |
| 442 | goto fail; |
| 443 | } else if (header.sector_size != SECTOR_SIZE) { |
| 444 | error_setg(errp, "unsupported VDI image (sector size %" PRIu32 |
| 445 | " is not %llu)", header.sector_size, SECTOR_SIZE); |
| 446 | ret = -ENOTSUP; |
| 447 | goto fail; |
| 448 | } else if (header.block_size != DEFAULT_CLUSTER_SIZE) { |
| 449 | error_setg(errp, "unsupported VDI image (block size %" PRIu32 |
| 450 | " is not %" PRIu32 ")", |
| 451 | header.block_size, DEFAULT_CLUSTER_SIZE); |
| 452 | ret = -ENOTSUP; |
| 453 | goto fail; |
| 454 | } else if (header.disk_size > |
| 455 | (uint64_t)header.blocks_in_image * header.block_size) { |
| 456 | error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", " |
| 457 | "image bitmap has room for %" PRIu64 ")", |
| 458 | header.disk_size, |
| 459 | (uint64_t)header.blocks_in_image * header.block_size); |
| 460 | ret = -ENOTSUP; |
| 461 | goto fail; |
| 462 | } else if (!qemu_uuid_is_null(&uuid_link)) { |
| 463 | error_setg(errp, "unsupported VDI image (non-NULL link UUID)"); |
| 464 | ret = -ENOTSUP; |
| 465 | goto fail; |
| 466 | } else if (!qemu_uuid_is_null(&uuid_parent)) { |
| 467 | error_setg(errp, "unsupported VDI image (non-NULL parent UUID)"); |
| 468 | ret = -ENOTSUP; |
| 469 | goto fail; |
| 470 | } else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) { |
| 471 | error_setg(errp, "unsupported VDI image " |
| 472 | "(too many blocks %u, max is %u)", |
| 473 | header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX); |
| 474 | ret = -ENOTSUP; |
| 475 | goto fail; |
| 476 | } |
| 477 | |
| 478 | bs->total_sectors = header.disk_size / SECTOR_SIZE; |
| 479 | |
| 480 | s->block_size = header.block_size; |
| 481 | s->bmap_sector = header.offset_bmap / SECTOR_SIZE; |
| 482 | s->header = header; |
| 483 | |
| 484 | bmap_size = header.blocks_in_image * sizeof(uint32_t); |
| 485 | bmap_size = DIV_ROUND_UP(bmap_size, SECTOR_SIZE); |
| 486 | s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE); |
| 487 | if (s->bmap == NULL) { |
| 488 | ret = -ENOMEM; |
| 489 | goto fail; |
| 490 | } |
| 491 | |
| 492 | ret = bdrv_pread(bs->file, header.offset_bmap, bmap_size * SECTOR_SIZE, |
| 493 | s->bmap, 0); |
| 494 | if (ret < 0) { |
| 495 | goto fail_free_bmap; |
| 496 | } |
| 497 | |
| 498 | /* Disable migration when vdi images are used */ |
| 499 | error_setg(&s->migration_blocker, "The vdi format used by node '%s' " |
| 500 | "does not support live migration", |
| 501 | bdrv_get_device_or_node_name(bs)); |
| 502 | |
| 503 | ret = migrate_add_blocker_normal(&s->migration_blocker, errp); |
| 504 | if (ret < 0) { |
| 505 | goto fail_free_bmap; |
| 506 | } |
| 507 | |
| 508 | qemu_co_rwlock_init(&s->bmap_lock); |
| 509 | |
| 510 | return 0; |
| 511 | |
| 512 | fail_free_bmap: |
| 513 | qemu_vfree(s->bmap); |
| 514 | |
| 515 | fail: |
| 516 | return ret; |
| 517 | } |
| 518 | |
| 519 | static int vdi_reopen_prepare(BDRVReopenState *state, |
| 520 | BlockReopenQueue *queue, Error **errp) |
| 521 | { |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | static int coroutine_fn GRAPH_RDLOCK |
| 526 | vdi_co_block_status(BlockDriverState *bs, unsigned int mode, |
| 527 | int64_t offset, int64_t bytes, int64_t *pnum, int64_t *map, |
| 528 | BlockDriverState **file) |
| 529 | { |
| 530 | BDRVVdiState *s = (BDRVVdiState *)bs->opaque; |
| 531 | size_t bmap_index = offset / s->block_size; |
| 532 | size_t index_in_block = offset % s->block_size; |
| 533 | uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]); |
| 534 | int result; |
| 535 | |
| 536 | logout("%p, %" PRId64 ", %" PRId64 ", %p\n", bs, offset, bytes, pnum); |
| 537 | *pnum = MIN(s->block_size - index_in_block, bytes); |
| 538 | result = VDI_IS_ALLOCATED(bmap_entry); |
| 539 | if (!result) { |
| 540 | return BDRV_BLOCK_ZERO; |
| 541 | } |
| 542 | |
| 543 | *map = s->header.offset_data + (uint64_t)bmap_entry * s->block_size + |
| 544 | index_in_block; |
| 545 | *file = bs->file->bs; |
| 546 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | |
| 547 | (s->header.image_type == VDI_TYPE_STATIC ? BDRV_BLOCK_RECURSE : 0); |
| 548 | } |
| 549 | |
| 550 | static int coroutine_fn GRAPH_RDLOCK |
| 551 | vdi_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 552 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 553 | { |
| 554 | BDRVVdiState *s = bs->opaque; |
| 555 | QEMUIOVector local_qiov; |
| 556 | uint32_t bmap_entry; |
| 557 | uint32_t block_index; |
| 558 | uint32_t offset_in_block; |
| 559 | uint32_t n_bytes; |
| 560 | uint64_t bytes_done = 0; |
| 561 | int ret = 0; |
| 562 | |
| 563 | logout("\n"); |
| 564 | |
| 565 | qemu_iovec_init(&local_qiov, qiov->niov); |
| 566 | |
| 567 | while (ret >= 0 && bytes > 0) { |
| 568 | block_index = offset / s->block_size; |
| 569 | offset_in_block = offset % s->block_size; |
| 570 | n_bytes = MIN(bytes, s->block_size - offset_in_block); |
| 571 | |
| 572 | logout("will read %u bytes starting at offset %" PRIu64 "\n", |
| 573 | n_bytes, offset); |
| 574 | |
| 575 | /* prepare next AIO request */ |
| 576 | qemu_co_rwlock_rdlock(&s->bmap_lock); |
| 577 | bmap_entry = le32_to_cpu(s->bmap[block_index]); |
| 578 | qemu_co_rwlock_unlock(&s->bmap_lock); |
| 579 | if (!VDI_IS_ALLOCATED(bmap_entry)) { |
| 580 | /* Block not allocated, return zeros, no need to wait. */ |
| 581 | qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); |
| 582 | ret = 0; |
| 583 | } else { |
| 584 | uint64_t data_offset = s->header.offset_data + |
| 585 | (uint64_t)bmap_entry * s->block_size + |
| 586 | offset_in_block; |
| 587 | |
| 588 | qemu_iovec_reset(&local_qiov); |
| 589 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); |
| 590 | |
| 591 | ret = bdrv_co_preadv(bs->file, data_offset, n_bytes, |
| 592 | &local_qiov, 0); |
| 593 | } |
| 594 | logout("%u bytes read\n", n_bytes); |
| 595 | |
| 596 | bytes -= n_bytes; |
| 597 | offset += n_bytes; |
| 598 | bytes_done += n_bytes; |
| 599 | } |
| 600 | |
| 601 | qemu_iovec_destroy(&local_qiov); |
| 602 | |
| 603 | return ret; |
| 604 | } |
| 605 | |
| 606 | static int coroutine_fn GRAPH_RDLOCK |
| 607 | vdi_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 608 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 609 | { |
| 610 | BDRVVdiState *s = bs->opaque; |
| 611 | QEMUIOVector local_qiov; |
| 612 | uint32_t bmap_entry; |
| 613 | uint32_t block_index; |
| 614 | uint32_t offset_in_block; |
| 615 | uint32_t n_bytes; |
| 616 | uint64_t data_offset; |
| 617 | uint32_t bmap_first = VDI_UNALLOCATED; |
| 618 | uint32_t bmap_last = VDI_UNALLOCATED; |
| 619 | uint8_t *block = NULL; |
| 620 | uint64_t bytes_done = 0; |
| 621 | int ret = 0; |
| 622 | |
| 623 | logout("\n"); |
| 624 | |
| 625 | qemu_iovec_init(&local_qiov, qiov->niov); |
| 626 | |
| 627 | while (ret >= 0 && bytes > 0) { |
| 628 | block_index = offset / s->block_size; |
| 629 | offset_in_block = offset % s->block_size; |
| 630 | n_bytes = MIN(bytes, s->block_size - offset_in_block); |
| 631 | |
| 632 | logout("will write %u bytes starting at offset %" PRIu64 "\n", |
| 633 | n_bytes, offset); |
| 634 | |
| 635 | /* prepare next AIO request */ |
| 636 | qemu_co_rwlock_rdlock(&s->bmap_lock); |
| 637 | bmap_entry = le32_to_cpu(s->bmap[block_index]); |
| 638 | if (!VDI_IS_ALLOCATED(bmap_entry)) { |
| 639 | /* Allocate new block and write to it. */ |
| 640 | qemu_co_rwlock_upgrade(&s->bmap_lock); |
| 641 | bmap_entry = le32_to_cpu(s->bmap[block_index]); |
| 642 | if (VDI_IS_ALLOCATED(bmap_entry)) { |
| 643 | /* A concurrent allocation did the work for us. */ |
| 644 | qemu_co_rwlock_downgrade(&s->bmap_lock); |
| 645 | goto nonallocating_write; |
| 646 | } |
| 647 | |
| 648 | bmap_entry = s->header.blocks_allocated; |
| 649 | s->bmap[block_index] = cpu_to_le32(bmap_entry); |
| 650 | s->header.blocks_allocated++; |
| 651 | data_offset = s->header.offset_data + |
| 652 | (uint64_t)bmap_entry * s->block_size; |
| 653 | if (block == NULL) { |
| 654 | block = g_malloc(s->block_size); |
| 655 | bmap_first = block_index; |
| 656 | } |
| 657 | bmap_last = block_index; |
| 658 | /* Copy data to be written to new block and zero unused parts. */ |
| 659 | memset(block, 0, offset_in_block); |
| 660 | qemu_iovec_to_buf(qiov, bytes_done, block + offset_in_block, |
| 661 | n_bytes); |
| 662 | memset(block + offset_in_block + n_bytes, 0, |
| 663 | s->block_size - n_bytes - offset_in_block); |
| 664 | |
| 665 | /* Write the new block under CoRwLock write-side protection, |
| 666 | * so this full-cluster write does not overlap a partial write |
| 667 | * of the same cluster, issued from the "else" branch. |
| 668 | */ |
| 669 | ret = bdrv_co_pwrite(bs->file, data_offset, s->block_size, block, |
| 670 | 0); |
| 671 | qemu_co_rwlock_unlock(&s->bmap_lock); |
| 672 | } else { |
| 673 | nonallocating_write: |
| 674 | data_offset = s->header.offset_data + |
| 675 | (uint64_t)bmap_entry * s->block_size + |
| 676 | offset_in_block; |
| 677 | qemu_co_rwlock_unlock(&s->bmap_lock); |
| 678 | |
| 679 | qemu_iovec_reset(&local_qiov); |
| 680 | qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); |
| 681 | |
| 682 | ret = bdrv_co_pwritev(bs->file, data_offset, n_bytes, |
| 683 | &local_qiov, 0); |
| 684 | } |
| 685 | |
| 686 | bytes -= n_bytes; |
| 687 | offset += n_bytes; |
| 688 | bytes_done += n_bytes; |
| 689 | |
| 690 | logout("%u bytes written\n", n_bytes); |
| 691 | } |
| 692 | |
| 693 | qemu_iovec_destroy(&local_qiov); |
| 694 | |
| 695 | logout("finished data write\n"); |
| 696 | if (ret < 0) { |
| 697 | g_free(block); |
| 698 | return ret; |
| 699 | } |
| 700 | |
| 701 | if (block) { |
| 702 | /* One or more new blocks were allocated. */ |
| 703 | VdiHeader *header; |
| 704 | uint8_t *base; |
| 705 | uint64_t bmap_offset; |
| 706 | uint32_t n_sectors; |
| 707 | |
| 708 | g_free(block); |
| 709 | header = g_malloc(sizeof(*header)); |
| 710 | |
| 711 | logout("now writing modified header\n"); |
| 712 | assert(VDI_IS_ALLOCATED(bmap_first)); |
| 713 | *header = s->header; |
| 714 | vdi_header_to_le(header); |
| 715 | ret = bdrv_co_pwrite(bs->file, 0, sizeof(*header), header, 0); |
| 716 | g_free(header); |
| 717 | |
| 718 | if (ret < 0) { |
| 719 | return ret; |
| 720 | } |
| 721 | |
| 722 | logout("now writing modified block map entry %u...%u\n", |
| 723 | bmap_first, bmap_last); |
| 724 | /* Write modified sectors from block map. */ |
| 725 | bmap_first /= (SECTOR_SIZE / sizeof(uint32_t)); |
| 726 | bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); |
| 727 | n_sectors = bmap_last - bmap_first + 1; |
| 728 | bmap_offset = s->bmap_sector + bmap_first; |
| 729 | base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; |
| 730 | logout("will write %u block map sectors starting from entry %u\n", |
| 731 | n_sectors, bmap_first); |
| 732 | ret = bdrv_co_pwrite(bs->file, bmap_offset * SECTOR_SIZE, |
| 733 | n_sectors * SECTOR_SIZE, base, 0); |
| 734 | } |
| 735 | |
| 736 | return ret; |
| 737 | } |
| 738 | |
| 739 | static int coroutine_fn GRAPH_UNLOCKED |
| 740 | vdi_co_do_create(BlockdevCreateOptions *create_options, size_t block_size, |
| 741 | Error **errp) |
| 742 | { |
| 743 | ERRP_GUARD(); |
| 744 | BlockdevCreateOptionsVdi *vdi_opts; |
| 745 | int ret = 0; |
| 746 | uint64_t bytes = 0; |
| 747 | uint32_t blocks; |
| 748 | uint32_t image_type; |
| 749 | VdiHeader header; |
| 750 | size_t i; |
| 751 | size_t bmap_size; |
| 752 | int64_t offset = 0; |
| 753 | BlockDriverState *bs_file = NULL; |
| 754 | BlockBackend *blk = NULL; |
| 755 | uint32_t *bmap = NULL; |
| 756 | QemuUUID uuid; |
| 757 | |
| 758 | assert(create_options->driver == BLOCKDEV_DRIVER_VDI); |
| 759 | vdi_opts = &create_options->u.vdi; |
| 760 | |
| 761 | logout("\n"); |
| 762 | |
| 763 | /* Validate options and set default values */ |
| 764 | bytes = vdi_opts->size; |
| 765 | |
| 766 | if (!vdi_opts->has_preallocation) { |
| 767 | vdi_opts->preallocation = PREALLOC_MODE_OFF; |
| 768 | } |
| 769 | switch (vdi_opts->preallocation) { |
| 770 | case PREALLOC_MODE_OFF: |
| 771 | image_type = VDI_TYPE_DYNAMIC; |
| 772 | break; |
| 773 | case PREALLOC_MODE_METADATA: |
| 774 | image_type = VDI_TYPE_STATIC; |
| 775 | break; |
| 776 | default: |
| 777 | error_setg(errp, "Preallocation mode not supported for vdi"); |
| 778 | return -EINVAL; |
| 779 | } |
| 780 | |
| 781 | #ifndef CONFIG_VDI_STATIC_IMAGE |
| 782 | if (image_type == VDI_TYPE_STATIC) { |
| 783 | ret = -ENOTSUP; |
| 784 | error_setg(errp, "Statically allocated images cannot be created in " |
| 785 | "this build"); |
| 786 | goto exit; |
| 787 | } |
| 788 | #endif |
| 789 | #ifndef CONFIG_VDI_BLOCK_SIZE |
| 790 | if (block_size != DEFAULT_CLUSTER_SIZE) { |
| 791 | ret = -ENOTSUP; |
| 792 | error_setg(errp, |
| 793 | "A non-default cluster size is not supported in this build"); |
| 794 | goto exit; |
| 795 | } |
| 796 | #endif |
| 797 | |
| 798 | if (bytes > VDI_DISK_SIZE_MAX) { |
| 799 | ret = -ENOTSUP; |
| 800 | error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64 |
| 801 | ", max supported is 0x%" PRIx64 ")", |
| 802 | bytes, VDI_DISK_SIZE_MAX); |
| 803 | goto exit; |
| 804 | } |
| 805 | |
| 806 | /* Create BlockBackend to write to the image */ |
| 807 | bs_file = bdrv_co_open_blockdev_ref(vdi_opts->file, errp); |
| 808 | if (!bs_file) { |
| 809 | ret = -EIO; |
| 810 | goto exit; |
| 811 | } |
| 812 | |
| 813 | blk = blk_co_new_with_bs(bs_file, BLK_PERM_WRITE | BLK_PERM_RESIZE, |
| 814 | BLK_PERM_ALL, errp); |
| 815 | if (!blk) { |
| 816 | ret = -EPERM; |
| 817 | goto exit; |
| 818 | } |
| 819 | |
| 820 | blk_set_allow_write_beyond_eof(blk, true); |
| 821 | |
| 822 | /* We need enough blocks to store the given disk size, |
| 823 | so always round up. */ |
| 824 | blocks = DIV_ROUND_UP(bytes, block_size); |
| 825 | |
| 826 | bmap_size = blocks * sizeof(uint32_t); |
| 827 | bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE); |
| 828 | |
| 829 | memset(&header, 0, sizeof(header)); |
| 830 | pstrcpy(header.text, sizeof(header.text), VDI_TEXT); |
| 831 | header.signature = VDI_SIGNATURE; |
| 832 | header.version = VDI_VERSION_1_1; |
| 833 | header.header_size = 0x180; |
| 834 | header.image_type = image_type; |
| 835 | header.offset_bmap = 0x200; |
| 836 | header.offset_data = 0x200 + bmap_size; |
| 837 | header.sector_size = SECTOR_SIZE; |
| 838 | header.disk_size = bytes; |
| 839 | header.block_size = block_size; |
| 840 | header.blocks_in_image = blocks; |
| 841 | if (image_type == VDI_TYPE_STATIC) { |
| 842 | header.blocks_allocated = blocks; |
| 843 | } |
| 844 | qemu_uuid_generate(&uuid); |
| 845 | header.uuid_image = uuid; |
| 846 | qemu_uuid_generate(&uuid); |
| 847 | header.uuid_last_snap = uuid; |
| 848 | /* There is no need to set header.uuid_link or header.uuid_parent here. */ |
| 849 | if (VDI_DEBUG) { |
| 850 | vdi_header_print(&header); |
| 851 | } |
| 852 | vdi_header_to_le(&header); |
| 853 | ret = blk_co_pwrite(blk, offset, sizeof(header), &header, 0); |
| 854 | if (ret < 0) { |
| 855 | error_setg(errp, "Error writing header"); |
| 856 | goto exit; |
| 857 | } |
| 858 | offset += sizeof(header); |
| 859 | |
| 860 | if (bmap_size > 0) { |
| 861 | bmap = g_try_malloc0(bmap_size); |
| 862 | if (bmap == NULL) { |
| 863 | ret = -ENOMEM; |
| 864 | error_setg(errp, "Could not allocate bmap"); |
| 865 | goto exit; |
| 866 | } |
| 867 | for (i = 0; i < blocks; i++) { |
| 868 | if (image_type == VDI_TYPE_STATIC) { |
| 869 | bmap[i] = i; |
| 870 | } else { |
| 871 | bmap[i] = VDI_UNALLOCATED; |
| 872 | } |
| 873 | } |
| 874 | ret = blk_co_pwrite(blk, offset, bmap_size, bmap, 0); |
| 875 | if (ret < 0) { |
| 876 | error_setg(errp, "Error writing bmap"); |
| 877 | goto exit; |
| 878 | } |
| 879 | offset += bmap_size; |
| 880 | } |
| 881 | |
| 882 | if (image_type == VDI_TYPE_STATIC) { |
| 883 | ret = blk_co_truncate(blk, offset + blocks * block_size, false, |
| 884 | PREALLOC_MODE_OFF, 0, errp); |
| 885 | if (ret < 0) { |
| 886 | error_prepend(errp, "Failed to statically allocate file"); |
| 887 | goto exit; |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | ret = 0; |
| 892 | exit: |
| 893 | blk_co_unref(blk); |
| 894 | bdrv_co_unref(bs_file); |
| 895 | g_free(bmap); |
| 896 | return ret; |
| 897 | } |
| 898 | |
| 899 | static int coroutine_fn GRAPH_UNLOCKED |
| 900 | vdi_co_create(BlockdevCreateOptions *create_options, Error **errp) |
| 901 | { |
| 902 | return vdi_co_do_create(create_options, DEFAULT_CLUSTER_SIZE, errp); |
| 903 | } |
| 904 | |
| 905 | static int coroutine_fn GRAPH_UNLOCKED |
| 906 | vdi_co_create_opts(BlockDriver *drv, const char *filename, |
| 907 | QemuOpts *opts, Error **errp) |
| 908 | { |
| 909 | QDict *qdict = NULL; |
| 910 | BlockdevCreateOptions *create_options = NULL; |
| 911 | BlockDriverState *bs_file = NULL; |
| 912 | uint64_t block_size = DEFAULT_CLUSTER_SIZE; |
| 913 | bool is_static = false; |
| 914 | Visitor *v; |
| 915 | int ret; |
| 916 | |
| 917 | /* Parse options and convert legacy syntax. |
| 918 | * |
| 919 | * Since CONFIG_VDI_BLOCK_SIZE is disabled by default, |
| 920 | * cluster-size is not part of the QAPI schema; therefore we have |
| 921 | * to parse it before creating the QAPI object. */ |
| 922 | #if defined(CONFIG_VDI_BLOCK_SIZE) |
| 923 | block_size = qemu_opt_get_size_del(opts, |
| 924 | BLOCK_OPT_CLUSTER_SIZE, |
| 925 | DEFAULT_CLUSTER_SIZE); |
| 926 | if (block_size < BDRV_SECTOR_SIZE || block_size > UINT32_MAX || |
| 927 | !is_power_of_2(block_size)) |
| 928 | { |
| 929 | error_setg(errp, "Invalid cluster size"); |
| 930 | ret = -EINVAL; |
| 931 | goto done; |
| 932 | } |
| 933 | #endif |
| 934 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) { |
| 935 | is_static = true; |
| 936 | } |
| 937 | |
| 938 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vdi_create_opts, true); |
| 939 | |
| 940 | /* Create and open the file (protocol layer) */ |
| 941 | ret = bdrv_co_create_file(filename, opts, true, errp); |
| 942 | if (ret < 0) { |
| 943 | goto done; |
| 944 | } |
| 945 | |
| 946 | bs_file = bdrv_co_open(filename, NULL, NULL, |
| 947 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); |
| 948 | if (!bs_file) { |
| 949 | ret = -EIO; |
| 950 | goto done; |
| 951 | } |
| 952 | |
| 953 | qdict_put_str(qdict, "driver", "vdi"); |
| 954 | qdict_put_str(qdict, "file", bs_file->node_name); |
| 955 | if (is_static) { |
| 956 | qdict_put_str(qdict, "preallocation", "metadata"); |
| 957 | } |
| 958 | |
| 959 | /* Get the QAPI object */ |
| 960 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
| 961 | if (!v) { |
| 962 | ret = -EINVAL; |
| 963 | goto done; |
| 964 | } |
| 965 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
| 966 | visit_free(v); |
| 967 | if (!create_options) { |
| 968 | ret = -EINVAL; |
| 969 | goto done; |
| 970 | } |
| 971 | |
| 972 | /* Silently round up size */ |
| 973 | assert(create_options->driver == BLOCKDEV_DRIVER_VDI); |
| 974 | create_options->u.vdi.size = ROUND_UP(create_options->u.vdi.size, |
| 975 | BDRV_SECTOR_SIZE); |
| 976 | |
| 977 | /* Create the vdi image (format layer) */ |
| 978 | ret = vdi_co_do_create(create_options, block_size, errp); |
| 979 | done: |
| 980 | qobject_unref(qdict); |
| 981 | qapi_free_BlockdevCreateOptions(create_options); |
| 982 | bdrv_co_unref(bs_file); |
| 983 | return ret; |
| 984 | } |
| 985 | |
| 986 | static void vdi_close(BlockDriverState *bs) |
| 987 | { |
| 988 | BDRVVdiState *s = bs->opaque; |
| 989 | |
| 990 | qemu_vfree(s->bmap); |
| 991 | |
| 992 | migrate_del_blocker(&s->migration_blocker); |
| 993 | } |
| 994 | |
| 995 | static int GRAPH_RDLOCK vdi_has_zero_init(BlockDriverState *bs) |
| 996 | { |
| 997 | BDRVVdiState *s = bs->opaque; |
| 998 | |
| 999 | if (s->header.image_type == VDI_TYPE_STATIC) { |
| 1000 | return bdrv_has_zero_init(bs->file->bs); |
| 1001 | } else { |
| 1002 | return 1; |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | static QemuOptsList vdi_create_opts = { |
| 1007 | .name = "vdi-create-opts", |
| 1008 | .head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head), |
| 1009 | .desc = { |
| 1010 | { |
| 1011 | .name = BLOCK_OPT_SIZE, |
| 1012 | .type = QEMU_OPT_SIZE, |
| 1013 | .help = "Virtual disk size" |
| 1014 | }, |
| 1015 | #if defined(CONFIG_VDI_BLOCK_SIZE) |
| 1016 | { |
| 1017 | .name = BLOCK_OPT_CLUSTER_SIZE, |
| 1018 | .type = QEMU_OPT_SIZE, |
| 1019 | .help = "VDI cluster (block) size", |
| 1020 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) |
| 1021 | }, |
| 1022 | #endif |
| 1023 | #if defined(CONFIG_VDI_STATIC_IMAGE) |
| 1024 | { |
| 1025 | .name = BLOCK_OPT_STATIC, |
| 1026 | .type = QEMU_OPT_BOOL, |
| 1027 | .help = "VDI static (pre-allocated) image", |
| 1028 | .def_value_str = "off" |
| 1029 | }, |
| 1030 | #endif |
| 1031 | /* TODO: An additional option to set UUID values might be useful. */ |
| 1032 | { /* end of list */ } |
| 1033 | } |
| 1034 | }; |
| 1035 | |
| 1036 | static BlockDriver bdrv_vdi = { |
| 1037 | .format_name = "vdi", |
| 1038 | .instance_size = sizeof(BDRVVdiState), |
| 1039 | .bdrv_probe = vdi_probe, |
| 1040 | .bdrv_open = vdi_open, |
| 1041 | .bdrv_close = vdi_close, |
| 1042 | .bdrv_reopen_prepare = vdi_reopen_prepare, |
| 1043 | .bdrv_child_perm = bdrv_default_perms, |
| 1044 | .bdrv_co_create = vdi_co_create, |
| 1045 | .bdrv_co_create_opts = vdi_co_create_opts, |
| 1046 | .bdrv_has_zero_init = vdi_has_zero_init, |
| 1047 | .bdrv_co_block_status = vdi_co_block_status, |
| 1048 | .bdrv_make_empty = vdi_make_empty, |
| 1049 | |
| 1050 | .bdrv_co_preadv = vdi_co_preadv, |
| 1051 | #if defined(CONFIG_VDI_WRITE) |
| 1052 | .bdrv_co_pwritev = vdi_co_pwritev, |
| 1053 | #endif |
| 1054 | |
| 1055 | .bdrv_co_get_info = vdi_co_get_info, |
| 1056 | |
| 1057 | .is_format = true, |
| 1058 | .create_opts = &vdi_create_opts, |
| 1059 | .bdrv_co_check = vdi_co_check, |
| 1060 | }; |
| 1061 | |
| 1062 | static void bdrv_vdi_init(void) |
| 1063 | { |
| 1064 | logout("\n"); |
| 1065 | bdrv_register(&bdrv_vdi); |
| 1066 | } |
| 1067 | |
| 1068 | block_init(bdrv_vdi_init); |