| 1 | /* |
| 2 | * Block driver for the QCOW format |
| 3 | * |
| 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include "qemu/osdep.h" |
| 26 | #include "qapi/error.h" |
| 27 | #include "qemu/error-report.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 "qemu/bswap.h" |
| 34 | #include "qemu/cutils.h" |
| 35 | #include "qemu/memalign.h" |
| 36 | #include <zlib.h> |
| 37 | #include "qobject/qdict.h" |
| 38 | #include "qobject/qstring.h" |
| 39 | #include "qapi/qobject-input-visitor.h" |
| 40 | #include "qapi/qapi-visit-block-core.h" |
| 41 | #include "crypto/block.h" |
| 42 | #include "migration/blocker.h" |
| 43 | #include "crypto.h" |
| 44 | |
| 45 | /**************************************************************/ |
| 46 | /* QEMU COW block driver with compression and encryption support */ |
| 47 | |
| 48 | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) |
| 49 | #define QCOW_VERSION 1 |
| 50 | |
| 51 | #define QCOW_CRYPT_NONE 0 |
| 52 | #define QCOW_CRYPT_AES 1 |
| 53 | |
| 54 | #define QCOW_OFLAG_COMPRESSED (1LL << 63) |
| 55 | |
| 56 | typedef struct QCowHeader { |
| 57 | uint32_t magic; |
| 58 | uint32_t version; |
| 59 | uint64_t backing_file_offset; |
| 60 | uint32_t backing_file_size; |
| 61 | uint32_t mtime; |
| 62 | uint64_t size; /* in bytes */ |
| 63 | uint8_t cluster_bits; |
| 64 | uint8_t l2_bits; |
| 65 | uint16_t padding; |
| 66 | uint32_t crypt_method; |
| 67 | uint64_t l1_table_offset; |
| 68 | } QEMU_PACKED QCowHeader; |
| 69 | |
| 70 | #define L2_CACHE_SIZE 16 |
| 71 | |
| 72 | typedef struct BDRVQcowState { |
| 73 | int cluster_bits; |
| 74 | int cluster_size; |
| 75 | int l2_bits; |
| 76 | int l2_size; |
| 77 | unsigned int l1_size; |
| 78 | uint64_t cluster_offset_mask; |
| 79 | uint64_t l1_table_offset; |
| 80 | uint64_t *l1_table; |
| 81 | uint64_t *l2_cache; |
| 82 | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; |
| 83 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
| 84 | uint8_t *cluster_cache; |
| 85 | uint8_t *cluster_data; |
| 86 | uint64_t cluster_cache_offset; |
| 87 | QCryptoBlock *crypto; /* Disk encryption format driver */ |
| 88 | uint32_t crypt_method_header; |
| 89 | CoMutex lock; |
| 90 | Error *migration_blocker; |
| 91 | } BDRVQcowState; |
| 92 | |
| 93 | static QemuOptsList qcow_create_opts; |
| 94 | |
| 95 | static int coroutine_fn GRAPH_RDLOCK |
| 96 | decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); |
| 97 | |
| 98 | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 99 | { |
| 100 | const QCowHeader *cow_header = (const void *)buf; |
| 101 | |
| 102 | if (buf_size >= sizeof(QCowHeader) && |
| 103 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
| 104 | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
| 105 | return 100; |
| 106 | else |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static int qcow_open(BlockDriverState *bs, QDict *options, int flags, |
| 111 | Error **errp) |
| 112 | { |
| 113 | BDRVQcowState *s = bs->opaque; |
| 114 | unsigned int len, i, shift; |
| 115 | int ret; |
| 116 | QCowHeader header; |
| 117 | QCryptoBlockOpenOptions *crypto_opts = NULL; |
| 118 | unsigned int cflags = 0; |
| 119 | QDict *encryptopts = NULL; |
| 120 | const char *encryptfmt; |
| 121 | |
| 122 | qdict_extract_subqdict(options, &encryptopts, "encrypt."); |
| 123 | encryptfmt = qdict_get_try_str(encryptopts, "format"); |
| 124 | |
| 125 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
| 126 | if (ret < 0) { |
| 127 | goto fail_unlocked; |
| 128 | } |
| 129 | |
| 130 | bdrv_graph_rdlock_main_loop(); |
| 131 | |
| 132 | ret = bdrv_pread(bs->file, 0, sizeof(header), &header, 0); |
| 133 | if (ret < 0) { |
| 134 | goto fail; |
| 135 | } |
| 136 | header.magic = be32_to_cpu(header.magic); |
| 137 | header.version = be32_to_cpu(header.version); |
| 138 | header.backing_file_offset = be64_to_cpu(header.backing_file_offset); |
| 139 | header.backing_file_size = be32_to_cpu(header.backing_file_size); |
| 140 | header.mtime = be32_to_cpu(header.mtime); |
| 141 | header.size = be64_to_cpu(header.size); |
| 142 | header.crypt_method = be32_to_cpu(header.crypt_method); |
| 143 | header.l1_table_offset = be64_to_cpu(header.l1_table_offset); |
| 144 | |
| 145 | if (header.magic != QCOW_MAGIC) { |
| 146 | error_setg(errp, "Image not in qcow format"); |
| 147 | ret = -EINVAL; |
| 148 | goto fail; |
| 149 | } |
| 150 | if (header.version != QCOW_VERSION) { |
| 151 | error_setg(errp, "qcow (v%d) does not support qcow version %" PRIu32, |
| 152 | QCOW_VERSION, header.version); |
| 153 | if (header.version == 2 || header.version == 3) { |
| 154 | error_append_hint(errp, "Try the 'qcow2' driver instead.\n"); |
| 155 | } |
| 156 | |
| 157 | ret = -ENOTSUP; |
| 158 | goto fail; |
| 159 | } |
| 160 | |
| 161 | if (header.size <= 1) { |
| 162 | error_setg(errp, "Image size is too small (must be at least 2 bytes)"); |
| 163 | ret = -EINVAL; |
| 164 | goto fail; |
| 165 | } |
| 166 | if (header.cluster_bits < 9 || header.cluster_bits > 16) { |
| 167 | error_setg(errp, "Cluster size must be between 512 and 64k"); |
| 168 | ret = -EINVAL; |
| 169 | goto fail; |
| 170 | } |
| 171 | |
| 172 | /* l2_bits specifies number of entries; storing a uint64_t in each entry, |
| 173 | * so bytes = num_entries << 3. */ |
| 174 | if (header.l2_bits < 9 - 3 || header.l2_bits > 16 - 3) { |
| 175 | error_setg(errp, "L2 table size must be between 512 and 64k"); |
| 176 | ret = -EINVAL; |
| 177 | goto fail; |
| 178 | } |
| 179 | |
| 180 | s->crypt_method_header = header.crypt_method; |
| 181 | if (s->crypt_method_header) { |
| 182 | if (bdrv_uses_whitelist() && |
| 183 | s->crypt_method_header == QCOW_CRYPT_AES) { |
| 184 | error_setg(errp, |
| 185 | "Use of AES-CBC encrypted qcow images is no longer " |
| 186 | "supported in system emulators"); |
| 187 | error_append_hint(errp, |
| 188 | "You can use 'qemu-img convert' to convert your " |
| 189 | "image to an alternative supported format, such " |
| 190 | "as unencrypted qcow, or raw with the LUKS " |
| 191 | "format instead.\n"); |
| 192 | ret = -ENOSYS; |
| 193 | goto fail; |
| 194 | } |
| 195 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
| 196 | if (encryptfmt && !g_str_equal(encryptfmt, "aes")) { |
| 197 | error_setg(errp, |
| 198 | "Header reported 'aes' encryption format but " |
| 199 | "options specify '%s'", encryptfmt); |
| 200 | ret = -EINVAL; |
| 201 | goto fail; |
| 202 | } |
| 203 | qdict_put_str(encryptopts, "format", "qcow"); |
| 204 | crypto_opts = block_crypto_open_opts_init(encryptopts, errp); |
| 205 | if (!crypto_opts) { |
| 206 | ret = -EINVAL; |
| 207 | goto fail; |
| 208 | } |
| 209 | |
| 210 | if (flags & BDRV_O_NO_IO) { |
| 211 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; |
| 212 | } |
| 213 | s->crypto = qcrypto_block_open(crypto_opts, "encrypt.", |
| 214 | NULL, NULL, cflags, errp); |
| 215 | if (!s->crypto) { |
| 216 | ret = -EINVAL; |
| 217 | goto fail; |
| 218 | } |
| 219 | } else { |
| 220 | error_setg(errp, "invalid encryption method in qcow header"); |
| 221 | ret = -EINVAL; |
| 222 | goto fail; |
| 223 | } |
| 224 | bs->encrypted = true; |
| 225 | } else { |
| 226 | if (encryptfmt) { |
| 227 | error_setg(errp, "No encryption in image header, but options " |
| 228 | "specified format '%s'", encryptfmt); |
| 229 | ret = -EINVAL; |
| 230 | goto fail; |
| 231 | } |
| 232 | } |
| 233 | s->cluster_bits = header.cluster_bits; |
| 234 | s->cluster_size = 1 << s->cluster_bits; |
| 235 | s->l2_bits = header.l2_bits; |
| 236 | s->l2_size = 1 << s->l2_bits; |
| 237 | bs->total_sectors = header.size / 512; |
| 238 | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; |
| 239 | |
| 240 | /* read the level 1 table */ |
| 241 | shift = s->cluster_bits + s->l2_bits; |
| 242 | if (header.size > UINT64_MAX - (1LL << shift)) { |
| 243 | error_setg(errp, "Image too large"); |
| 244 | ret = -EINVAL; |
| 245 | goto fail; |
| 246 | } else { |
| 247 | uint64_t l1_size = (header.size + (1LL << shift) - 1) >> shift; |
| 248 | if (l1_size > INT_MAX / sizeof(uint64_t)) { |
| 249 | error_setg(errp, "Image too large"); |
| 250 | ret = -EINVAL; |
| 251 | goto fail; |
| 252 | } |
| 253 | s->l1_size = l1_size; |
| 254 | } |
| 255 | |
| 256 | s->l1_table_offset = header.l1_table_offset; |
| 257 | s->l1_table = g_try_new(uint64_t, s->l1_size); |
| 258 | if (s->l1_table == NULL) { |
| 259 | error_setg(errp, "Could not allocate memory for L1 table"); |
| 260 | ret = -ENOMEM; |
| 261 | goto fail; |
| 262 | } |
| 263 | |
| 264 | ret = bdrv_pread(bs->file, s->l1_table_offset, |
| 265 | s->l1_size * sizeof(uint64_t), s->l1_table, 0); |
| 266 | if (ret < 0) { |
| 267 | goto fail; |
| 268 | } |
| 269 | |
| 270 | for(i = 0;i < s->l1_size; i++) { |
| 271 | s->l1_table[i] = be64_to_cpu(s->l1_table[i]); |
| 272 | } |
| 273 | |
| 274 | /* alloc L2 cache (max. 64k * 16 * 8 = 8 MB) */ |
| 275 | s->l2_cache = |
| 276 | qemu_try_blockalign(bs->file->bs, |
| 277 | s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
| 278 | if (s->l2_cache == NULL) { |
| 279 | error_setg(errp, "Could not allocate L2 table cache"); |
| 280 | ret = -ENOMEM; |
| 281 | goto fail; |
| 282 | } |
| 283 | s->cluster_cache = g_malloc(s->cluster_size); |
| 284 | s->cluster_data = g_malloc(s->cluster_size); |
| 285 | s->cluster_cache_offset = -1; |
| 286 | |
| 287 | /* read the backing file name */ |
| 288 | if (header.backing_file_offset != 0) { |
| 289 | len = header.backing_file_size; |
| 290 | if (len > 1023 || len >= sizeof(bs->backing_file)) { |
| 291 | error_setg(errp, "Backing file name too long"); |
| 292 | ret = -EINVAL; |
| 293 | goto fail; |
| 294 | } |
| 295 | ret = bdrv_pread(bs->file, header.backing_file_offset, len, |
| 296 | bs->auto_backing_file, 0); |
| 297 | if (ret < 0) { |
| 298 | goto fail; |
| 299 | } |
| 300 | bs->auto_backing_file[len] = '\0'; |
| 301 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), |
| 302 | bs->auto_backing_file); |
| 303 | } |
| 304 | |
| 305 | /* Disable migration when qcow images are used */ |
| 306 | error_setg(&s->migration_blocker, "The qcow format used by node '%s' " |
| 307 | "does not support live migration", |
| 308 | bdrv_get_device_or_node_name(bs)); |
| 309 | |
| 310 | ret = migrate_add_blocker_normal(&s->migration_blocker, errp); |
| 311 | if (ret < 0) { |
| 312 | goto fail; |
| 313 | } |
| 314 | |
| 315 | qobject_unref(encryptopts); |
| 316 | qapi_free_QCryptoBlockOpenOptions(crypto_opts); |
| 317 | qemu_co_mutex_init(&s->lock); |
| 318 | bdrv_graph_rdunlock_main_loop(); |
| 319 | return 0; |
| 320 | |
| 321 | fail: |
| 322 | bdrv_graph_rdunlock_main_loop(); |
| 323 | fail_unlocked: |
| 324 | g_free(s->l1_table); |
| 325 | qemu_vfree(s->l2_cache); |
| 326 | g_free(s->cluster_cache); |
| 327 | g_free(s->cluster_data); |
| 328 | qcrypto_block_free(s->crypto); |
| 329 | qobject_unref(encryptopts); |
| 330 | qapi_free_QCryptoBlockOpenOptions(crypto_opts); |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | |
| 335 | /* We have nothing to do for QCOW reopen, stubs just return |
| 336 | * success */ |
| 337 | static int qcow_reopen_prepare(BDRVReopenState *state, |
| 338 | BlockReopenQueue *queue, Error **errp) |
| 339 | { |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | |
| 344 | /* 'allocate' is: |
| 345 | * |
| 346 | * 0 to not allocate. |
| 347 | * |
| 348 | * 1 to allocate a normal cluster (for sector-aligned byte offsets 'n_start' |
| 349 | * to 'n_end' within the cluster) |
| 350 | * |
| 351 | * 2 to allocate a compressed cluster of size |
| 352 | * 'compressed_size'. 'compressed_size' must be > 0 and < |
| 353 | * cluster_size |
| 354 | * |
| 355 | * return 0 if not allocated, 1 if *result is assigned, and negative |
| 356 | * errno on failure. |
| 357 | */ |
| 358 | static int coroutine_fn GRAPH_RDLOCK |
| 359 | get_cluster_offset(BlockDriverState *bs, uint64_t offset, int allocate, |
| 360 | int compressed_size, int n_start, int n_end, |
| 361 | uint64_t *result) |
| 362 | { |
| 363 | BDRVQcowState *s = bs->opaque; |
| 364 | int min_index, i, j, l1_index, l2_index, ret; |
| 365 | int64_t l2_offset; |
| 366 | uint64_t *l2_table, cluster_offset, tmp; |
| 367 | uint32_t min_count; |
| 368 | int new_l2_table; |
| 369 | |
| 370 | *result = 0; |
| 371 | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
| 372 | l2_offset = s->l1_table[l1_index]; |
| 373 | new_l2_table = 0; |
| 374 | if (!l2_offset) { |
| 375 | if (!allocate) |
| 376 | return 0; |
| 377 | /* allocate a new l2 entry */ |
| 378 | l2_offset = bdrv_co_getlength(bs->file->bs); |
| 379 | if (l2_offset < 0) { |
| 380 | return l2_offset; |
| 381 | } |
| 382 | /* round to cluster size */ |
| 383 | l2_offset = QEMU_ALIGN_UP(l2_offset, s->cluster_size); |
| 384 | /* update the L1 entry */ |
| 385 | s->l1_table[l1_index] = l2_offset; |
| 386 | tmp = cpu_to_be64(l2_offset); |
| 387 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L1_UPDATE); |
| 388 | ret = bdrv_co_pwrite_sync(bs->file, |
| 389 | s->l1_table_offset + l1_index * sizeof(tmp), |
| 390 | sizeof(tmp), &tmp, 0); |
| 391 | if (ret < 0) { |
| 392 | return ret; |
| 393 | } |
| 394 | new_l2_table = 1; |
| 395 | } |
| 396 | for(i = 0; i < L2_CACHE_SIZE; i++) { |
| 397 | if (l2_offset == s->l2_cache_offsets[i]) { |
| 398 | /* increment the hit count */ |
| 399 | if (++s->l2_cache_counts[i] == 0xffffffff) { |
| 400 | for(j = 0; j < L2_CACHE_SIZE; j++) { |
| 401 | s->l2_cache_counts[j] >>= 1; |
| 402 | } |
| 403 | } |
| 404 | l2_table = s->l2_cache + (i << s->l2_bits); |
| 405 | goto found; |
| 406 | } |
| 407 | } |
| 408 | /* not found: load a new entry in the least used one */ |
| 409 | min_index = 0; |
| 410 | min_count = 0xffffffff; |
| 411 | for(i = 0; i < L2_CACHE_SIZE; i++) { |
| 412 | if (s->l2_cache_counts[i] < min_count) { |
| 413 | min_count = s->l2_cache_counts[i]; |
| 414 | min_index = i; |
| 415 | } |
| 416 | } |
| 417 | l2_table = s->l2_cache + (min_index << s->l2_bits); |
| 418 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L2_LOAD); |
| 419 | if (new_l2_table) { |
| 420 | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); |
| 421 | ret = bdrv_co_pwrite_sync(bs->file, l2_offset, |
| 422 | s->l2_size * sizeof(uint64_t), l2_table, 0); |
| 423 | if (ret < 0) { |
| 424 | return ret; |
| 425 | } |
| 426 | } else { |
| 427 | ret = bdrv_co_pread(bs->file, l2_offset, |
| 428 | s->l2_size * sizeof(uint64_t), l2_table, 0); |
| 429 | if (ret < 0) { |
| 430 | return ret; |
| 431 | } |
| 432 | } |
| 433 | s->l2_cache_offsets[min_index] = l2_offset; |
| 434 | s->l2_cache_counts[min_index] = 1; |
| 435 | found: |
| 436 | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1); |
| 437 | cluster_offset = be64_to_cpu(l2_table[l2_index]); |
| 438 | if (!cluster_offset || |
| 439 | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) { |
| 440 | if (!allocate) |
| 441 | return 0; |
| 442 | BLKDBG_CO_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC); |
| 443 | assert(QEMU_IS_ALIGNED(n_start | n_end, BDRV_SECTOR_SIZE)); |
| 444 | /* allocate a new cluster */ |
| 445 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) && |
| 446 | (n_end - n_start) < s->cluster_size) { |
| 447 | /* if the cluster is already compressed, we must |
| 448 | decompress it in the case it is not completely |
| 449 | overwritten */ |
| 450 | if (decompress_cluster(bs, cluster_offset) < 0) { |
| 451 | return -EIO; |
| 452 | } |
| 453 | cluster_offset = bdrv_co_getlength(bs->file->bs); |
| 454 | if ((int64_t) cluster_offset < 0) { |
| 455 | return cluster_offset; |
| 456 | } |
| 457 | cluster_offset = QEMU_ALIGN_UP(cluster_offset, s->cluster_size); |
| 458 | /* write the cluster content */ |
| 459 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
| 460 | ret = bdrv_co_pwrite(bs->file, cluster_offset, s->cluster_size, |
| 461 | s->cluster_cache, 0); |
| 462 | if (ret < 0) { |
| 463 | return ret; |
| 464 | } |
| 465 | } else { |
| 466 | cluster_offset = bdrv_co_getlength(bs->file->bs); |
| 467 | if ((int64_t) cluster_offset < 0) { |
| 468 | return cluster_offset; |
| 469 | } |
| 470 | if (allocate == 1) { |
| 471 | /* round to cluster size */ |
| 472 | cluster_offset = QEMU_ALIGN_UP(cluster_offset, s->cluster_size); |
| 473 | if (cluster_offset + s->cluster_size > INT64_MAX) { |
| 474 | return -E2BIG; |
| 475 | } |
| 476 | ret = bdrv_co_truncate(bs->file, |
| 477 | cluster_offset + s->cluster_size, |
| 478 | false, PREALLOC_MODE_OFF, 0, NULL); |
| 479 | if (ret < 0) { |
| 480 | return ret; |
| 481 | } |
| 482 | /* if encrypted, we must initialize the cluster |
| 483 | content which won't be written */ |
| 484 | if (bs->encrypted && |
| 485 | (n_end - n_start) < s->cluster_size) { |
| 486 | uint64_t start_offset; |
| 487 | assert(s->crypto); |
| 488 | start_offset = offset & ~(s->cluster_size - 1); |
| 489 | for (i = 0; i < s->cluster_size; i += BDRV_SECTOR_SIZE) { |
| 490 | if (i < n_start || i >= n_end) { |
| 491 | memset(s->cluster_data, 0x00, BDRV_SECTOR_SIZE); |
| 492 | if (qcrypto_block_encrypt(s->crypto, |
| 493 | start_offset + i, |
| 494 | s->cluster_data, |
| 495 | BDRV_SECTOR_SIZE, |
| 496 | NULL) < 0) { |
| 497 | return -EIO; |
| 498 | } |
| 499 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
| 500 | ret = bdrv_co_pwrite(bs->file, cluster_offset + i, |
| 501 | BDRV_SECTOR_SIZE, |
| 502 | s->cluster_data, 0); |
| 503 | if (ret < 0) { |
| 504 | return ret; |
| 505 | } |
| 506 | } |
| 507 | } |
| 508 | } |
| 509 | } else if (allocate == 2) { |
| 510 | cluster_offset |= QCOW_OFLAG_COMPRESSED | |
| 511 | (uint64_t)compressed_size << (63 - s->cluster_bits); |
| 512 | } |
| 513 | } |
| 514 | /* update L2 table */ |
| 515 | tmp = cpu_to_be64(cluster_offset); |
| 516 | l2_table[l2_index] = tmp; |
| 517 | if (allocate == 2) { |
| 518 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L2_UPDATE_COMPRESSED); |
| 519 | } else { |
| 520 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L2_UPDATE); |
| 521 | } |
| 522 | ret = bdrv_co_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
| 523 | sizeof(tmp), &tmp, 0); |
| 524 | if (ret < 0) { |
| 525 | return ret; |
| 526 | } |
| 527 | } |
| 528 | *result = cluster_offset; |
| 529 | return 1; |
| 530 | } |
| 531 | |
| 532 | static int coroutine_fn GRAPH_RDLOCK |
| 533 | qcow_co_block_status(BlockDriverState *bs, unsigned int mode, |
| 534 | int64_t offset, int64_t bytes, int64_t *pnum, |
| 535 | int64_t *map, BlockDriverState **file) |
| 536 | { |
| 537 | BDRVQcowState *s = bs->opaque; |
| 538 | int index_in_cluster, ret; |
| 539 | int64_t n; |
| 540 | uint64_t cluster_offset; |
| 541 | |
| 542 | qemu_co_mutex_lock(&s->lock); |
| 543 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
| 544 | qemu_co_mutex_unlock(&s->lock); |
| 545 | if (ret < 0) { |
| 546 | return ret; |
| 547 | } |
| 548 | index_in_cluster = offset & (s->cluster_size - 1); |
| 549 | n = s->cluster_size - index_in_cluster; |
| 550 | if (n > bytes) { |
| 551 | n = bytes; |
| 552 | } |
| 553 | *pnum = n; |
| 554 | if (!cluster_offset) { |
| 555 | return 0; |
| 556 | } |
| 557 | if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
| 558 | return BDRV_BLOCK_DATA | BDRV_BLOCK_COMPRESSED; |
| 559 | } |
| 560 | if (s->crypto) { |
| 561 | return BDRV_BLOCK_DATA; |
| 562 | } |
| 563 | *map = cluster_offset | index_in_cluster; |
| 564 | *file = bs->file->bs; |
| 565 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
| 566 | } |
| 567 | |
| 568 | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, |
| 569 | const uint8_t *buf, int buf_size) |
| 570 | { |
| 571 | z_stream strm1, *strm = &strm1; |
| 572 | int ret, out_len; |
| 573 | |
| 574 | memset(strm, 0, sizeof(*strm)); |
| 575 | |
| 576 | strm->next_in = (uint8_t *)buf; |
| 577 | strm->avail_in = buf_size; |
| 578 | strm->next_out = out_buf; |
| 579 | strm->avail_out = out_buf_size; |
| 580 | |
| 581 | ret = inflateInit2(strm, -12); |
| 582 | if (ret != Z_OK) |
| 583 | return -1; |
| 584 | ret = inflate(strm, Z_FINISH); |
| 585 | out_len = strm->next_out - out_buf; |
| 586 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || |
| 587 | out_len != out_buf_size) { |
| 588 | inflateEnd(strm); |
| 589 | return -1; |
| 590 | } |
| 591 | inflateEnd(strm); |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | static int coroutine_fn GRAPH_RDLOCK |
| 596 | decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
| 597 | { |
| 598 | BDRVQcowState *s = bs->opaque; |
| 599 | int ret, csize; |
| 600 | uint64_t coffset; |
| 601 | |
| 602 | coffset = cluster_offset & s->cluster_offset_mask; |
| 603 | if (s->cluster_cache_offset != coffset) { |
| 604 | csize = cluster_offset >> (63 - s->cluster_bits); |
| 605 | csize &= (s->cluster_size - 1); |
| 606 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_COMPRESSED); |
| 607 | ret = bdrv_co_pread(bs->file, coffset, csize, s->cluster_data, 0); |
| 608 | if (ret < 0) |
| 609 | return -1; |
| 610 | if (decompress_buffer(s->cluster_cache, s->cluster_size, |
| 611 | s->cluster_data, csize) < 0) { |
| 612 | return -1; |
| 613 | } |
| 614 | s->cluster_cache_offset = coffset; |
| 615 | } |
| 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static void qcow_refresh_limits(BlockDriverState *bs, Error **errp) |
| 620 | { |
| 621 | /* At least encrypted images require 512-byte alignment. Apply the |
| 622 | * limit universally, rather than just on encrypted images, as |
| 623 | * it's easier to let the block layer handle rounding than to |
| 624 | * audit this code further. */ |
| 625 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; |
| 626 | } |
| 627 | |
| 628 | static int coroutine_fn GRAPH_RDLOCK |
| 629 | qcow_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 630 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 631 | { |
| 632 | BDRVQcowState *s = bs->opaque; |
| 633 | int offset_in_cluster; |
| 634 | int ret = 0, n; |
| 635 | uint64_t cluster_offset; |
| 636 | uint8_t *buf; |
| 637 | void *orig_buf; |
| 638 | |
| 639 | if (qiov->niov > 1) { |
| 640 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
| 641 | if (buf == NULL) { |
| 642 | return -ENOMEM; |
| 643 | } |
| 644 | } else { |
| 645 | orig_buf = NULL; |
| 646 | buf = (uint8_t *)qiov->iov->iov_base; |
| 647 | } |
| 648 | |
| 649 | qemu_co_mutex_lock(&s->lock); |
| 650 | |
| 651 | while (bytes != 0) { |
| 652 | /* prepare next request */ |
| 653 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
| 654 | if (ret < 0) { |
| 655 | break; |
| 656 | } |
| 657 | offset_in_cluster = offset & (s->cluster_size - 1); |
| 658 | n = s->cluster_size - offset_in_cluster; |
| 659 | if (n > bytes) { |
| 660 | n = bytes; |
| 661 | } |
| 662 | |
| 663 | if (!cluster_offset) { |
| 664 | if (bs->backing) { |
| 665 | /* read from the base image */ |
| 666 | qemu_co_mutex_unlock(&s->lock); |
| 667 | /* qcow2 emits this on bs->file instead of bs->backing */ |
| 668 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
| 669 | ret = bdrv_co_pread(bs->backing, offset, n, buf, 0); |
| 670 | qemu_co_mutex_lock(&s->lock); |
| 671 | if (ret < 0) { |
| 672 | break; |
| 673 | } |
| 674 | } else { |
| 675 | /* Note: in this case, no need to wait */ |
| 676 | memset(buf, 0, n); |
| 677 | } |
| 678 | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
| 679 | /* add AIO support for compressed blocks ? */ |
| 680 | if (decompress_cluster(bs, cluster_offset) < 0) { |
| 681 | ret = -EIO; |
| 682 | break; |
| 683 | } |
| 684 | memcpy(buf, s->cluster_cache + offset_in_cluster, n); |
| 685 | } else { |
| 686 | if ((cluster_offset & 511) != 0) { |
| 687 | ret = -EIO; |
| 688 | break; |
| 689 | } |
| 690 | qemu_co_mutex_unlock(&s->lock); |
| 691 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_AIO); |
| 692 | ret = bdrv_co_pread(bs->file, cluster_offset + offset_in_cluster, |
| 693 | n, buf, 0); |
| 694 | qemu_co_mutex_lock(&s->lock); |
| 695 | if (ret < 0) { |
| 696 | break; |
| 697 | } |
| 698 | if (bs->encrypted) { |
| 699 | assert(s->crypto); |
| 700 | if (qcrypto_block_decrypt(s->crypto, |
| 701 | offset, buf, n, NULL) < 0) { |
| 702 | ret = -EIO; |
| 703 | break; |
| 704 | } |
| 705 | } |
| 706 | } |
| 707 | ret = 0; |
| 708 | |
| 709 | bytes -= n; |
| 710 | offset += n; |
| 711 | buf += n; |
| 712 | } |
| 713 | |
| 714 | qemu_co_mutex_unlock(&s->lock); |
| 715 | |
| 716 | if (qiov->niov > 1) { |
| 717 | qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size); |
| 718 | qemu_vfree(orig_buf); |
| 719 | } |
| 720 | |
| 721 | return ret; |
| 722 | } |
| 723 | |
| 724 | static int coroutine_fn GRAPH_RDLOCK |
| 725 | qcow_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 726 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 727 | { |
| 728 | BDRVQcowState *s = bs->opaque; |
| 729 | int offset_in_cluster; |
| 730 | uint64_t cluster_offset; |
| 731 | int ret = 0, n; |
| 732 | uint8_t *buf; |
| 733 | void *orig_buf; |
| 734 | |
| 735 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
| 736 | |
| 737 | /* We must always copy the iov when encrypting, so we |
| 738 | * don't modify the original data buffer during encryption */ |
| 739 | if (bs->encrypted || qiov->niov > 1) { |
| 740 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
| 741 | if (buf == NULL) { |
| 742 | return -ENOMEM; |
| 743 | } |
| 744 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
| 745 | } else { |
| 746 | orig_buf = NULL; |
| 747 | buf = (uint8_t *)qiov->iov->iov_base; |
| 748 | } |
| 749 | |
| 750 | qemu_co_mutex_lock(&s->lock); |
| 751 | |
| 752 | while (bytes != 0) { |
| 753 | offset_in_cluster = offset & (s->cluster_size - 1); |
| 754 | n = s->cluster_size - offset_in_cluster; |
| 755 | if (n > bytes) { |
| 756 | n = bytes; |
| 757 | } |
| 758 | ret = get_cluster_offset(bs, offset, 1, 0, offset_in_cluster, |
| 759 | offset_in_cluster + n, &cluster_offset); |
| 760 | if (ret < 0) { |
| 761 | break; |
| 762 | } |
| 763 | if (!cluster_offset || (cluster_offset & 511) != 0) { |
| 764 | ret = -EIO; |
| 765 | break; |
| 766 | } |
| 767 | if (bs->encrypted) { |
| 768 | assert(s->crypto); |
| 769 | if (qcrypto_block_encrypt(s->crypto, offset, buf, n, NULL) < 0) { |
| 770 | ret = -EIO; |
| 771 | break; |
| 772 | } |
| 773 | } |
| 774 | |
| 775 | qemu_co_mutex_unlock(&s->lock); |
| 776 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
| 777 | ret = bdrv_co_pwrite(bs->file, cluster_offset + offset_in_cluster, |
| 778 | n, buf, 0); |
| 779 | qemu_co_mutex_lock(&s->lock); |
| 780 | if (ret < 0) { |
| 781 | break; |
| 782 | } |
| 783 | ret = 0; |
| 784 | |
| 785 | bytes -= n; |
| 786 | offset += n; |
| 787 | buf += n; |
| 788 | } |
| 789 | qemu_co_mutex_unlock(&s->lock); |
| 790 | |
| 791 | qemu_vfree(orig_buf); |
| 792 | |
| 793 | return ret; |
| 794 | } |
| 795 | |
| 796 | static void qcow_close(BlockDriverState *bs) |
| 797 | { |
| 798 | BDRVQcowState *s = bs->opaque; |
| 799 | |
| 800 | qcrypto_block_free(s->crypto); |
| 801 | s->crypto = NULL; |
| 802 | g_free(s->l1_table); |
| 803 | qemu_vfree(s->l2_cache); |
| 804 | g_free(s->cluster_cache); |
| 805 | g_free(s->cluster_data); |
| 806 | |
| 807 | migrate_del_blocker(&s->migration_blocker); |
| 808 | } |
| 809 | |
| 810 | static int coroutine_fn GRAPH_UNLOCKED |
| 811 | qcow_co_create(BlockdevCreateOptions *opts, Error **errp) |
| 812 | { |
| 813 | BlockdevCreateOptionsQcow *qcow_opts; |
| 814 | int header_size, backing_filename_len, l1_size, shift, i; |
| 815 | QCowHeader header; |
| 816 | uint8_t *tmp; |
| 817 | int64_t total_size = 0; |
| 818 | int ret; |
| 819 | BlockDriverState *bs; |
| 820 | BlockBackend *qcow_blk; |
| 821 | QCryptoBlock *crypto = NULL; |
| 822 | |
| 823 | assert(opts->driver == BLOCKDEV_DRIVER_QCOW); |
| 824 | qcow_opts = &opts->u.qcow; |
| 825 | |
| 826 | /* Sanity checks */ |
| 827 | total_size = qcow_opts->size; |
| 828 | if (total_size == 0) { |
| 829 | error_setg(errp, "Image size is too small, cannot be zero length"); |
| 830 | return -EINVAL; |
| 831 | } |
| 832 | |
| 833 | if (qcow_opts->encrypt && |
| 834 | qcow_opts->encrypt->format != QCRYPTO_BLOCK_FORMAT_QCOW) |
| 835 | { |
| 836 | error_setg(errp, "Unsupported encryption format"); |
| 837 | return -EINVAL; |
| 838 | } |
| 839 | |
| 840 | /* Create BlockBackend to write to the image */ |
| 841 | bs = bdrv_co_open_blockdev_ref(qcow_opts->file, errp); |
| 842 | if (bs == NULL) { |
| 843 | return -EIO; |
| 844 | } |
| 845 | |
| 846 | qcow_blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, |
| 847 | BLK_PERM_ALL, errp); |
| 848 | if (!qcow_blk) { |
| 849 | ret = -EPERM; |
| 850 | goto exit; |
| 851 | } |
| 852 | blk_set_allow_write_beyond_eof(qcow_blk, true); |
| 853 | |
| 854 | /* Create image format */ |
| 855 | memset(&header, 0, sizeof(header)); |
| 856 | header.magic = cpu_to_be32(QCOW_MAGIC); |
| 857 | header.version = cpu_to_be32(QCOW_VERSION); |
| 858 | header.size = cpu_to_be64(total_size); |
| 859 | header_size = sizeof(header); |
| 860 | backing_filename_len = 0; |
| 861 | if (qcow_opts->backing_file) { |
| 862 | if (strcmp(qcow_opts->backing_file, "fat:")) { |
| 863 | header.backing_file_offset = cpu_to_be64(header_size); |
| 864 | backing_filename_len = strlen(qcow_opts->backing_file); |
| 865 | header.backing_file_size = cpu_to_be32(backing_filename_len); |
| 866 | header_size += backing_filename_len; |
| 867 | } else { |
| 868 | /* special backing file for vvfat */ |
| 869 | qcow_opts->backing_file = NULL; |
| 870 | } |
| 871 | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
| 872 | unmodified sectors */ |
| 873 | header.l2_bits = 12; /* 32 KB L2 tables */ |
| 874 | } else { |
| 875 | header.cluster_bits = 12; /* 4 KB clusters */ |
| 876 | header.l2_bits = 9; /* 4 KB L2 tables */ |
| 877 | } |
| 878 | header_size = (header_size + 7) & ~7; |
| 879 | shift = header.cluster_bits + header.l2_bits; |
| 880 | l1_size = (total_size + (1LL << shift) - 1) >> shift; |
| 881 | |
| 882 | header.l1_table_offset = cpu_to_be64(header_size); |
| 883 | |
| 884 | if (qcow_opts->encrypt) { |
| 885 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
| 886 | |
| 887 | crypto = qcrypto_block_create(qcow_opts->encrypt, "encrypt.", |
| 888 | NULL, NULL, NULL, 0, errp); |
| 889 | if (!crypto) { |
| 890 | ret = -EINVAL; |
| 891 | goto exit; |
| 892 | } |
| 893 | } else { |
| 894 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
| 895 | } |
| 896 | |
| 897 | /* write all the data */ |
| 898 | ret = blk_co_pwrite(qcow_blk, 0, sizeof(header), &header, 0); |
| 899 | if (ret < 0) { |
| 900 | goto exit; |
| 901 | } |
| 902 | |
| 903 | if (qcow_opts->backing_file) { |
| 904 | ret = blk_co_pwrite(qcow_blk, sizeof(header), backing_filename_len, |
| 905 | qcow_opts->backing_file, 0); |
| 906 | if (ret < 0) { |
| 907 | goto exit; |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | tmp = g_malloc0(BDRV_SECTOR_SIZE); |
| 912 | for (i = 0; i < DIV_ROUND_UP(sizeof(uint64_t) * l1_size, BDRV_SECTOR_SIZE); |
| 913 | i++) { |
| 914 | ret = blk_co_pwrite(qcow_blk, header_size + BDRV_SECTOR_SIZE * i, |
| 915 | BDRV_SECTOR_SIZE, tmp, 0); |
| 916 | if (ret < 0) { |
| 917 | g_free(tmp); |
| 918 | goto exit; |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | g_free(tmp); |
| 923 | ret = 0; |
| 924 | exit: |
| 925 | blk_co_unref(qcow_blk); |
| 926 | bdrv_co_unref(bs); |
| 927 | qcrypto_block_free(crypto); |
| 928 | return ret; |
| 929 | } |
| 930 | |
| 931 | static int coroutine_fn GRAPH_UNLOCKED |
| 932 | qcow_co_create_opts(BlockDriver *drv, const char *filename, |
| 933 | QemuOpts *opts, Error **errp) |
| 934 | { |
| 935 | BlockdevCreateOptions *create_options = NULL; |
| 936 | BlockDriverState *bs = NULL; |
| 937 | QDict *qdict = NULL; |
| 938 | Visitor *v; |
| 939 | const char *val; |
| 940 | int ret; |
| 941 | char *backing_fmt; |
| 942 | |
| 943 | static const QDictRenames opt_renames[] = { |
| 944 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, |
| 945 | { BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT }, |
| 946 | { NULL, NULL }, |
| 947 | }; |
| 948 | |
| 949 | /* |
| 950 | * We can't actually store a backing format, but can check that |
| 951 | * the user's request made sense. |
| 952 | */ |
| 953 | backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT); |
| 954 | if (backing_fmt && !bdrv_find_format(backing_fmt)) { |
| 955 | error_setg(errp, "unrecognized backing format '%s'", backing_fmt); |
| 956 | ret = -EINVAL; |
| 957 | goto fail; |
| 958 | } |
| 959 | |
| 960 | /* Parse options and convert legacy syntax */ |
| 961 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &qcow_create_opts, true); |
| 962 | |
| 963 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT); |
| 964 | if (val && !strcmp(val, "on")) { |
| 965 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow"); |
| 966 | } else if (val && !strcmp(val, "off")) { |
| 967 | qdict_del(qdict, BLOCK_OPT_ENCRYPT); |
| 968 | } |
| 969 | |
| 970 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT); |
| 971 | if (val && !strcmp(val, "aes")) { |
| 972 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow"); |
| 973 | } |
| 974 | |
| 975 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { |
| 976 | ret = -EINVAL; |
| 977 | goto fail; |
| 978 | } |
| 979 | |
| 980 | /* Create and open the file (protocol layer) */ |
| 981 | ret = bdrv_co_create_file(filename, opts, true, errp); |
| 982 | if (ret < 0) { |
| 983 | goto fail; |
| 984 | } |
| 985 | |
| 986 | bs = bdrv_co_open(filename, NULL, NULL, |
| 987 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); |
| 988 | if (bs == NULL) { |
| 989 | ret = -EIO; |
| 990 | goto fail; |
| 991 | } |
| 992 | |
| 993 | /* Now get the QAPI type BlockdevCreateOptions */ |
| 994 | qdict_put_str(qdict, "driver", "qcow"); |
| 995 | qdict_put_str(qdict, "file", bs->node_name); |
| 996 | |
| 997 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
| 998 | if (!v) { |
| 999 | ret = -EINVAL; |
| 1000 | goto fail; |
| 1001 | } |
| 1002 | |
| 1003 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
| 1004 | visit_free(v); |
| 1005 | if (!create_options) { |
| 1006 | ret = -EINVAL; |
| 1007 | goto fail; |
| 1008 | } |
| 1009 | |
| 1010 | /* Silently round up size */ |
| 1011 | assert(create_options->driver == BLOCKDEV_DRIVER_QCOW); |
| 1012 | create_options->u.qcow.size = |
| 1013 | ROUND_UP(create_options->u.qcow.size, BDRV_SECTOR_SIZE); |
| 1014 | |
| 1015 | /* Create the qcow image (format layer) */ |
| 1016 | ret = qcow_co_create(create_options, errp); |
| 1017 | if (ret < 0) { |
| 1018 | goto fail; |
| 1019 | } |
| 1020 | |
| 1021 | ret = 0; |
| 1022 | fail: |
| 1023 | g_free(backing_fmt); |
| 1024 | qobject_unref(qdict); |
| 1025 | bdrv_co_unref(bs); |
| 1026 | qapi_free_BlockdevCreateOptions(create_options); |
| 1027 | return ret; |
| 1028 | } |
| 1029 | |
| 1030 | static int GRAPH_RDLOCK qcow_make_empty(BlockDriverState *bs) |
| 1031 | { |
| 1032 | BDRVQcowState *s = bs->opaque; |
| 1033 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); |
| 1034 | int ret; |
| 1035 | |
| 1036 | memset(s->l1_table, 0, l1_length); |
| 1037 | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, l1_length, s->l1_table, |
| 1038 | 0) < 0) |
| 1039 | return -1; |
| 1040 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length, false, |
| 1041 | PREALLOC_MODE_OFF, 0, NULL); |
| 1042 | if (ret < 0) |
| 1043 | return ret; |
| 1044 | |
| 1045 | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
| 1046 | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); |
| 1047 | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); |
| 1048 | |
| 1049 | return 0; |
| 1050 | } |
| 1051 | |
| 1052 | /* XXX: put compressed sectors first, then all the cluster aligned |
| 1053 | tables to avoid losing bytes in alignment */ |
| 1054 | static int coroutine_fn GRAPH_RDLOCK |
| 1055 | qcow_co_pwritev_compressed(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 1056 | QEMUIOVector *qiov) |
| 1057 | { |
| 1058 | BDRVQcowState *s = bs->opaque; |
| 1059 | z_stream strm; |
| 1060 | int ret, out_len; |
| 1061 | uint8_t *buf, *out_buf; |
| 1062 | uint64_t cluster_offset; |
| 1063 | |
| 1064 | buf = qemu_blockalign(bs, s->cluster_size); |
| 1065 | if (bytes != s->cluster_size) { |
| 1066 | if (bytes > s->cluster_size || |
| 1067 | offset + bytes != bs->total_sectors << BDRV_SECTOR_BITS) |
| 1068 | { |
| 1069 | qemu_vfree(buf); |
| 1070 | return -EINVAL; |
| 1071 | } |
| 1072 | /* Zero-pad last write if image size is not cluster aligned */ |
| 1073 | memset(buf + bytes, 0, s->cluster_size - bytes); |
| 1074 | } |
| 1075 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
| 1076 | |
| 1077 | out_buf = g_malloc(s->cluster_size); |
| 1078 | |
| 1079 | /* best compression, small window, no zlib header */ |
| 1080 | memset(&strm, 0, sizeof(strm)); |
| 1081 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
| 1082 | Z_DEFLATED, -12, |
| 1083 | 9, Z_DEFAULT_STRATEGY); |
| 1084 | if (ret != 0) { |
| 1085 | ret = -EINVAL; |
| 1086 | goto fail; |
| 1087 | } |
| 1088 | |
| 1089 | strm.avail_in = s->cluster_size; |
| 1090 | strm.next_in = (uint8_t *)buf; |
| 1091 | strm.avail_out = s->cluster_size; |
| 1092 | strm.next_out = out_buf; |
| 1093 | |
| 1094 | ret = deflate(&strm, Z_FINISH); |
| 1095 | if (ret != Z_STREAM_END && ret != Z_OK) { |
| 1096 | deflateEnd(&strm); |
| 1097 | ret = -EINVAL; |
| 1098 | goto fail; |
| 1099 | } |
| 1100 | out_len = strm.next_out - out_buf; |
| 1101 | |
| 1102 | deflateEnd(&strm); |
| 1103 | |
| 1104 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { |
| 1105 | /* could not compress: write normal cluster */ |
| 1106 | ret = qcow_co_pwritev(bs, offset, bytes, qiov, 0); |
| 1107 | if (ret < 0) { |
| 1108 | goto fail; |
| 1109 | } |
| 1110 | goto success; |
| 1111 | } |
| 1112 | qemu_co_mutex_lock(&s->lock); |
| 1113 | ret = get_cluster_offset(bs, offset, 2, out_len, 0, 0, &cluster_offset); |
| 1114 | qemu_co_mutex_unlock(&s->lock); |
| 1115 | if (ret < 0) { |
| 1116 | goto fail; |
| 1117 | } |
| 1118 | if (cluster_offset == 0) { |
| 1119 | ret = -EIO; |
| 1120 | goto fail; |
| 1121 | } |
| 1122 | cluster_offset &= s->cluster_offset_mask; |
| 1123 | |
| 1124 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
| 1125 | ret = bdrv_co_pwrite(bs->file, cluster_offset, out_len, out_buf, 0); |
| 1126 | if (ret < 0) { |
| 1127 | goto fail; |
| 1128 | } |
| 1129 | success: |
| 1130 | ret = 0; |
| 1131 | fail: |
| 1132 | qemu_vfree(buf); |
| 1133 | g_free(out_buf); |
| 1134 | return ret; |
| 1135 | } |
| 1136 | |
| 1137 | static int coroutine_fn |
| 1138 | qcow_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 1139 | { |
| 1140 | BDRVQcowState *s = bs->opaque; |
| 1141 | bdi->cluster_size = s->cluster_size; |
| 1142 | return 0; |
| 1143 | } |
| 1144 | |
| 1145 | static QemuOptsList qcow_create_opts = { |
| 1146 | .name = "qcow-create-opts", |
| 1147 | .head = QTAILQ_HEAD_INITIALIZER(qcow_create_opts.head), |
| 1148 | .desc = { |
| 1149 | { |
| 1150 | .name = BLOCK_OPT_SIZE, |
| 1151 | .type = QEMU_OPT_SIZE, |
| 1152 | .help = "Virtual disk size" |
| 1153 | }, |
| 1154 | { |
| 1155 | .name = BLOCK_OPT_BACKING_FILE, |
| 1156 | .type = QEMU_OPT_STRING, |
| 1157 | .help = "File name of a base image" |
| 1158 | }, |
| 1159 | { |
| 1160 | .name = BLOCK_OPT_BACKING_FMT, |
| 1161 | .type = QEMU_OPT_STRING, |
| 1162 | .help = "Format of the backing image", |
| 1163 | }, |
| 1164 | { |
| 1165 | .name = BLOCK_OPT_ENCRYPT, |
| 1166 | .type = QEMU_OPT_BOOL, |
| 1167 | .help = "Encrypt the image with format 'aes'. (Deprecated " |
| 1168 | "in favor of " BLOCK_OPT_ENCRYPT_FORMAT "=aes)", |
| 1169 | }, |
| 1170 | { |
| 1171 | .name = BLOCK_OPT_ENCRYPT_FORMAT, |
| 1172 | .type = QEMU_OPT_STRING, |
| 1173 | .help = "Encrypt the image, format choices: 'aes'", |
| 1174 | }, |
| 1175 | BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt."), |
| 1176 | { /* end of list */ } |
| 1177 | } |
| 1178 | }; |
| 1179 | |
| 1180 | static const char *const qcow_strong_runtime_opts[] = { |
| 1181 | "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET, |
| 1182 | |
| 1183 | NULL |
| 1184 | }; |
| 1185 | |
| 1186 | static BlockDriver bdrv_qcow = { |
| 1187 | .format_name = "qcow", |
| 1188 | .instance_size = sizeof(BDRVQcowState), |
| 1189 | .bdrv_probe = qcow_probe, |
| 1190 | .bdrv_open = qcow_open, |
| 1191 | .bdrv_close = qcow_close, |
| 1192 | .bdrv_child_perm = bdrv_default_perms, |
| 1193 | .bdrv_reopen_prepare = qcow_reopen_prepare, |
| 1194 | .bdrv_co_create = qcow_co_create, |
| 1195 | .bdrv_co_create_opts = qcow_co_create_opts, |
| 1196 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
| 1197 | .is_format = true, |
| 1198 | .supports_backing = true, |
| 1199 | .bdrv_refresh_limits = qcow_refresh_limits, |
| 1200 | |
| 1201 | .bdrv_co_preadv = qcow_co_preadv, |
| 1202 | .bdrv_co_pwritev = qcow_co_pwritev, |
| 1203 | .bdrv_co_block_status = qcow_co_block_status, |
| 1204 | |
| 1205 | .bdrv_make_empty = qcow_make_empty, |
| 1206 | .bdrv_co_pwritev_compressed = qcow_co_pwritev_compressed, |
| 1207 | .bdrv_co_get_info = qcow_co_get_info, |
| 1208 | |
| 1209 | .create_opts = &qcow_create_opts, |
| 1210 | .strong_runtime_opts = qcow_strong_runtime_opts, |
| 1211 | }; |
| 1212 | |
| 1213 | static void bdrv_qcow_init(void) |
| 1214 | { |
| 1215 | bdrv_register(&bdrv_qcow); |
| 1216 | } |
| 1217 | |
| 1218 | block_init(bdrv_qcow_init); |