The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * QEMU System Emulator block driver |
| 3 | * |
| 4 | * Copyright (c) 2003 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 | #include "qemu-common.h" |
| 25 | #include "console.h" |
| 26 | #include "block_int.h" |
| 27 | |
| 28 | #ifdef _BSD |
| 29 | #include <sys/types.h> |
| 30 | #include <sys/stat.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <sys/queue.h> |
| 33 | #include <sys/disk.h> |
| 34 | #endif |
| 35 | |
| 36 | #define SECTOR_BITS 9 |
| 37 | #define SECTOR_SIZE (1 << SECTOR_BITS) |
| 38 | |
| 39 | typedef struct BlockDriverAIOCBSync { |
| 40 | BlockDriverAIOCB common; |
| 41 | QEMUBH *bh; |
| 42 | int ret; |
| 43 | } BlockDriverAIOCBSync; |
| 44 | |
| 45 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
| 46 | int64_t sector_num, uint8_t *buf, int nb_sectors, |
| 47 | BlockDriverCompletionFunc *cb, void *opaque); |
| 48 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
| 49 | int64_t sector_num, const uint8_t *buf, int nb_sectors, |
| 50 | BlockDriverCompletionFunc *cb, void *opaque); |
| 51 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
| 52 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 53 | uint8_t *buf, int nb_sectors); |
| 54 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 55 | const uint8_t *buf, int nb_sectors); |
| 56 | |
| 57 | static BlockDriver *first_drv; |
| 58 | |
| 59 | static int path_is_absolute(const char *path) |
| 60 | { |
| 61 | const char *p; |
| 62 | #ifdef _WIN32 |
| 63 | /* specific case for names like: "\\.\d:" */ |
| 64 | if (*path == '/' || *path == '\\') |
| 65 | return 1; |
| 66 | #endif |
| 67 | p = strchr(path, ':'); |
| 68 | if (p) |
| 69 | p++; |
| 70 | else |
| 71 | p = path; |
| 72 | #ifdef _WIN32 |
| 73 | return (*p == '/' || *p == '\\'); |
| 74 | #else |
| 75 | return (*p == '/'); |
| 76 | #endif |
| 77 | } |
| 78 | |
| 79 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
| 80 | path to it by considering it is relative to base_path. URL are |
| 81 | supported. */ |
| 82 | void path_combine(char *dest, int dest_size, |
| 83 | const char *base_path, |
| 84 | const char *filename) |
| 85 | { |
| 86 | const char *p, *p1; |
| 87 | int len; |
| 88 | |
| 89 | if (dest_size <= 0) |
| 90 | return; |
| 91 | if (path_is_absolute(filename)) { |
| 92 | pstrcpy(dest, dest_size, filename); |
| 93 | } else { |
| 94 | p = strchr(base_path, ':'); |
| 95 | if (p) |
| 96 | p++; |
| 97 | else |
| 98 | p = base_path; |
| 99 | p1 = strrchr(base_path, '/'); |
| 100 | #ifdef _WIN32 |
| 101 | { |
| 102 | const char *p2; |
| 103 | p2 = strrchr(base_path, '\\'); |
| 104 | if (!p1 || p2 > p1) |
| 105 | p1 = p2; |
| 106 | } |
| 107 | #endif |
| 108 | if (p1) |
| 109 | p1++; |
| 110 | else |
| 111 | p1 = base_path; |
| 112 | if (p1 > p) |
| 113 | p = p1; |
| 114 | len = p - base_path; |
| 115 | if (len > dest_size - 1) |
| 116 | len = dest_size - 1; |
| 117 | memcpy(dest, base_path, len); |
| 118 | dest[len] = '\0'; |
| 119 | pstrcat(dest, dest_size, filename); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | |
| 124 | static void bdrv_register(BlockDriver *bdrv) |
| 125 | { |
| 126 | if (!bdrv->bdrv_aio_read) { |
| 127 | /* add AIO emulation layer */ |
| 128 | bdrv->bdrv_aio_read = bdrv_aio_read_em; |
| 129 | bdrv->bdrv_aio_write = bdrv_aio_write_em; |
| 130 | bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
| 131 | bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); |
| 132 | } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
| 133 | /* add synchronous IO emulation layer */ |
| 134 | bdrv->bdrv_read = bdrv_read_em; |
| 135 | bdrv->bdrv_write = bdrv_write_em; |
| 136 | } |
| 137 | bdrv->next = first_drv; |
| 138 | first_drv = bdrv; |
| 139 | } |
| 140 | |
| 141 | /* create a new block device (by default it is empty) */ |
| 142 | BlockDriverState *bdrv_new(const char *device_name) |
| 143 | { |
| 144 | BlockDriverState **pbs, *bs; |
| 145 | |
| 146 | bs = qemu_mallocz(sizeof(BlockDriverState)); |
| 147 | if(!bs) |
| 148 | return NULL; |
| 149 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
| 150 | if (device_name[0] != '\0') { |
| 151 | /* insert at the end */ |
| 152 | pbs = &bdrv_first; |
| 153 | while (*pbs != NULL) |
| 154 | pbs = &(*pbs)->next; |
| 155 | *pbs = bs; |
| 156 | } |
| 157 | return bs; |
| 158 | } |
| 159 | |
| 160 | BlockDriver *bdrv_find_format(const char *format_name) |
| 161 | { |
| 162 | BlockDriver *drv1; |
| 163 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 164 | if (!strcmp(drv1->format_name, format_name)) |
| 165 | return drv1; |
| 166 | } |
| 167 | return NULL; |
| 168 | } |
| 169 | |
| 170 | int bdrv_create(BlockDriver *drv, |
| 171 | const char *filename, int64_t size_in_sectors, |
| 172 | const char *backing_file, int flags) |
| 173 | { |
| 174 | if (!drv->bdrv_create) |
| 175 | return -ENOTSUP; |
| 176 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); |
| 177 | } |
| 178 | |
| 179 | #ifdef _WIN32 |
| 180 | void get_tmp_filename(char *filename, int size) |
| 181 | { |
| 182 | char temp_dir[MAX_PATH]; |
| 183 | |
| 184 | GetTempPath(MAX_PATH, temp_dir); |
| 185 | GetTempFileName(temp_dir, "qem", 0, filename); |
| 186 | } |
| 187 | #else |
| 188 | void get_tmp_filename(char *filename, int size) |
| 189 | { |
| 190 | int fd; |
| 191 | const char *tmpdir; |
| 192 | /* XXX: race condition possible */ |
| 193 | tmpdir = getenv("TMPDIR"); |
| 194 | if (!tmpdir) |
| 195 | tmpdir = "/tmp"; |
| 196 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); |
| 197 | fd = mkstemp(filename); |
| 198 | close(fd); |
| 199 | } |
| 200 | #endif |
| 201 | |
| 202 | #ifdef _WIN32 |
| 203 | static int is_windows_drive_prefix(const char *filename) |
| 204 | { |
| 205 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 206 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 207 | filename[1] == ':'); |
| 208 | } |
| 209 | |
| 210 | static int is_windows_drive(const char *filename) |
| 211 | { |
| 212 | if (is_windows_drive_prefix(filename) && |
| 213 | filename[2] == '\0') |
| 214 | return 1; |
| 215 | if (strstart(filename, "\\\\.\\", NULL) || |
| 216 | strstart(filename, "//./", NULL)) |
| 217 | return 1; |
| 218 | return 0; |
| 219 | } |
| 220 | #endif |
| 221 | |
| 222 | static BlockDriver *find_protocol(const char *filename) |
| 223 | { |
| 224 | BlockDriver *drv1; |
| 225 | char protocol[128]; |
| 226 | int len; |
| 227 | const char *p; |
| 228 | |
| 229 | #ifdef _WIN32 |
| 230 | if (is_windows_drive(filename) || |
| 231 | is_windows_drive_prefix(filename)) |
| 232 | return &bdrv_raw; |
| 233 | #endif |
| 234 | p = strchr(filename, ':'); |
| 235 | if (!p) |
| 236 | return &bdrv_raw; |
| 237 | len = p - filename; |
| 238 | if (len > sizeof(protocol) - 1) |
| 239 | len = sizeof(protocol) - 1; |
| 240 | memcpy(protocol, filename, len); |
| 241 | protocol[len] = '\0'; |
| 242 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 243 | if (drv1->protocol_name && |
| 244 | !strcmp(drv1->protocol_name, protocol)) |
| 245 | return drv1; |
| 246 | } |
| 247 | return NULL; |
| 248 | } |
| 249 | |
| 250 | /* XXX: force raw format if block or character device ? It would |
| 251 | simplify the BSD case */ |
| 252 | static BlockDriver *find_image_format(const char *filename) |
| 253 | { |
| 254 | int ret, score, score_max; |
| 255 | BlockDriver *drv1, *drv; |
| 256 | uint8_t buf[2048]; |
| 257 | BlockDriverState *bs; |
| 258 | |
| 259 | /* detect host devices. By convention, /dev/cdrom[N] is always |
| 260 | recognized as a host CDROM */ |
| 261 | if (strstart(filename, "/dev/cdrom", NULL)) |
| 262 | return &bdrv_host_device; |
| 263 | #ifdef _WIN32 |
| 264 | if (is_windows_drive(filename)) |
| 265 | return &bdrv_host_device; |
| 266 | #else |
| 267 | { |
| 268 | struct stat st; |
| 269 | if (stat(filename, &st) >= 0 && |
| 270 | (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
| 271 | return &bdrv_host_device; |
| 272 | } |
| 273 | } |
| 274 | #endif |
| 275 | |
| 276 | drv = find_protocol(filename); |
| 277 | /* no need to test disk image formats for vvfat */ |
| 278 | if (drv == &bdrv_vvfat) |
| 279 | return drv; |
| 280 | |
| 281 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
| 282 | if (ret < 0) |
| 283 | return NULL; |
| 284 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 285 | bdrv_delete(bs); |
| 286 | if (ret < 0) { |
| 287 | return NULL; |
| 288 | } |
| 289 | |
| 290 | score_max = 0; |
| 291 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 292 | if (drv1->bdrv_probe) { |
| 293 | score = drv1->bdrv_probe(buf, ret, filename); |
| 294 | if (score > score_max) { |
| 295 | score_max = score; |
| 296 | drv = drv1; |
| 297 | } |
| 298 | } |
| 299 | } |
| 300 | return drv; |
| 301 | } |
| 302 | |
| 303 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 304 | { |
| 305 | BlockDriverState *bs; |
| 306 | int ret; |
| 307 | |
| 308 | bs = bdrv_new(""); |
| 309 | if (!bs) |
| 310 | return -ENOMEM; |
| 311 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
| 312 | if (ret < 0) { |
| 313 | bdrv_delete(bs); |
| 314 | return ret; |
| 315 | } |
| 316 | *pbs = bs; |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
| 321 | { |
| 322 | return bdrv_open2(bs, filename, flags, NULL); |
| 323 | } |
| 324 | |
| 325 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
| 326 | BlockDriver *drv) |
| 327 | { |
| 328 | int ret, open_flags; |
| 329 | char tmp_filename[PATH_MAX]; |
| 330 | char backing_filename[PATH_MAX]; |
| 331 | |
| 332 | bs->read_only = 0; |
| 333 | bs->is_temporary = 0; |
| 334 | bs->encrypted = 0; |
| 335 | |
| 336 | if (flags & BDRV_O_SNAPSHOT) { |
| 337 | BlockDriverState *bs1; |
| 338 | int64_t total_size; |
| 339 | int is_protocol = 0; |
| 340 | |
| 341 | /* if snapshot, we create a temporary backing file and open it |
| 342 | instead of opening 'filename' directly */ |
| 343 | |
| 344 | /* if there is a backing file, use it */ |
| 345 | bs1 = bdrv_new(""); |
| 346 | if (!bs1) { |
| 347 | return -ENOMEM; |
| 348 | } |
| 349 | if (bdrv_open(bs1, filename, 0) < 0) { |
| 350 | bdrv_delete(bs1); |
| 351 | return -1; |
| 352 | } |
| 353 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
| 354 | |
| 355 | if (bs1->drv && bs1->drv->protocol_name) |
| 356 | is_protocol = 1; |
| 357 | |
| 358 | bdrv_delete(bs1); |
| 359 | |
| 360 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
| 361 | |
| 362 | /* Real path is meaningless for protocols */ |
| 363 | if (is_protocol) |
| 364 | snprintf(backing_filename, sizeof(backing_filename), |
| 365 | "%s", filename); |
| 366 | else |
| 367 | realpath(filename, backing_filename); |
| 368 | |
| 369 | if (bdrv_create(&bdrv_qcow2, tmp_filename, |
| 370 | total_size, backing_filename, 0) < 0) { |
| 371 | return -1; |
| 372 | } |
| 373 | filename = tmp_filename; |
| 374 | bs->is_temporary = 1; |
| 375 | } |
| 376 | |
| 377 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 378 | if (flags & BDRV_O_FILE) { |
| 379 | drv = find_protocol(filename); |
| 380 | if (!drv) |
| 381 | return -ENOENT; |
| 382 | } else { |
| 383 | if (!drv) { |
| 384 | drv = find_image_format(filename); |
| 385 | if (!drv) |
| 386 | return -1; |
| 387 | } |
| 388 | } |
| 389 | bs->drv = drv; |
| 390 | bs->opaque = qemu_mallocz(drv->instance_size); |
| 391 | if (bs->opaque == NULL && drv->instance_size > 0) |
| 392 | return -1; |
| 393 | /* Note: for compatibility, we open disk image files as RDWR, and |
| 394 | RDONLY as fallback */ |
| 395 | if (!(flags & BDRV_O_FILE)) |
| 396 | open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT); |
| 397 | else |
| 398 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
| 399 | ret = drv->bdrv_open(bs, filename, open_flags); |
| 400 | if (ret == -EACCES && !(flags & BDRV_O_FILE)) { |
| 401 | ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); |
| 402 | bs->read_only = 1; |
| 403 | } |
| 404 | if (ret < 0) { |
| 405 | qemu_free(bs->opaque); |
| 406 | bs->opaque = NULL; |
| 407 | bs->drv = NULL; |
| 408 | return ret; |
| 409 | } |
| 410 | if (drv->bdrv_getlength) { |
| 411 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 412 | } |
| 413 | #ifndef _WIN32 |
| 414 | if (bs->is_temporary) { |
| 415 | unlink(filename); |
| 416 | } |
| 417 | #endif |
| 418 | if (bs->backing_file[0] != '\0') { |
| 419 | /* if there is a backing file, use it */ |
| 420 | bs->backing_hd = bdrv_new(""); |
| 421 | if (!bs->backing_hd) { |
| 422 | fail: |
| 423 | bdrv_close(bs); |
| 424 | return -ENOMEM; |
| 425 | } |
| 426 | path_combine(backing_filename, sizeof(backing_filename), |
| 427 | filename, bs->backing_file); |
| 428 | if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) |
| 429 | goto fail; |
| 430 | } |
| 431 | |
| 432 | /* call the change callback */ |
| 433 | bs->media_changed = 1; |
| 434 | if (bs->change_cb) |
| 435 | bs->change_cb(bs->change_opaque); |
| 436 | |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | void bdrv_close(BlockDriverState *bs) |
| 441 | { |
| 442 | if (bs->drv) { |
| 443 | if (bs->backing_hd) |
| 444 | bdrv_delete(bs->backing_hd); |
| 445 | bs->drv->bdrv_close(bs); |
| 446 | qemu_free(bs->opaque); |
| 447 | #ifdef _WIN32 |
| 448 | if (bs->is_temporary) { |
| 449 | unlink(bs->filename); |
| 450 | } |
| 451 | #endif |
| 452 | bs->opaque = NULL; |
| 453 | bs->drv = NULL; |
| 454 | |
| 455 | /* call the change callback */ |
| 456 | bs->media_changed = 1; |
| 457 | if (bs->change_cb) |
| 458 | bs->change_cb(bs->change_opaque); |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | void bdrv_delete(BlockDriverState *bs) |
| 463 | { |
| 464 | BlockDriverState **pbs; |
| 465 | |
| 466 | pbs = &bdrv_first; |
| 467 | while (*pbs != bs && *pbs != NULL) |
| 468 | pbs = &(*pbs)->next; |
| 469 | if (*pbs == bs) |
| 470 | *pbs = bs->next; |
| 471 | |
| 472 | bdrv_close(bs); |
| 473 | qemu_free(bs); |
| 474 | } |
| 475 | |
| 476 | /* commit COW file into the raw image */ |
| 477 | int bdrv_commit(BlockDriverState *bs) |
| 478 | { |
| 479 | BlockDriver *drv = bs->drv; |
| 480 | int64_t i, total_sectors; |
| 481 | int n, j; |
| 482 | unsigned char sector[512]; |
| 483 | |
| 484 | if (!drv) |
| 485 | return -ENOMEDIUM; |
| 486 | |
| 487 | if (bs->read_only) { |
| 488 | return -EACCES; |
| 489 | } |
| 490 | |
| 491 | if (!bs->backing_hd) { |
| 492 | return -ENOTSUP; |
| 493 | } |
| 494 | |
| 495 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 496 | for (i = 0; i < total_sectors;) { |
| 497 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
| 498 | for(j = 0; j < n; j++) { |
| 499 | if (bdrv_read(bs, i, sector, 1) != 0) { |
| 500 | return -EIO; |
| 501 | } |
| 502 | |
| 503 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
| 504 | return -EIO; |
| 505 | } |
| 506 | i++; |
| 507 | } |
| 508 | } else { |
| 509 | i += n; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | if (drv->bdrv_make_empty) |
| 514 | return drv->bdrv_make_empty(bs); |
| 515 | |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | /* return < 0 if error. See bdrv_write() for the return codes */ |
| 520 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
| 521 | uint8_t *buf, int nb_sectors) |
| 522 | { |
| 523 | BlockDriver *drv = bs->drv; |
| 524 | |
| 525 | if (!drv) |
| 526 | return -ENOMEDIUM; |
| 527 | |
| 528 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 529 | memcpy(buf, bs->boot_sector_data, 512); |
| 530 | sector_num++; |
| 531 | nb_sectors--; |
| 532 | buf += 512; |
| 533 | if (nb_sectors == 0) |
| 534 | return 0; |
| 535 | } |
| 536 | if (drv->bdrv_pread) { |
| 537 | int ret, len; |
| 538 | len = nb_sectors * 512; |
| 539 | ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); |
| 540 | if (ret < 0) |
| 541 | return ret; |
| 542 | else if (ret != len) |
| 543 | return -EINVAL; |
| 544 | else { |
| 545 | bs->rd_bytes += (unsigned) len; |
| 546 | bs->rd_ops ++; |
| 547 | return 0; |
| 548 | } |
| 549 | } else { |
| 550 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | /* Return < 0 if error. Important errors are: |
| 555 | -EIO generic I/O error (may happen for all errors) |
| 556 | -ENOMEDIUM No media inserted. |
| 557 | -EINVAL Invalid sector number or nb_sectors |
| 558 | -EACCES Trying to write a read-only device |
| 559 | */ |
| 560 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
| 561 | const uint8_t *buf, int nb_sectors) |
| 562 | { |
| 563 | BlockDriver *drv = bs->drv; |
| 564 | if (!bs->drv) |
| 565 | return -ENOMEDIUM; |
| 566 | if (bs->read_only) |
| 567 | return -EACCES; |
| 568 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 569 | memcpy(bs->boot_sector_data, buf, 512); |
| 570 | } |
| 571 | if (drv->bdrv_pwrite) { |
| 572 | int ret, len; |
| 573 | len = nb_sectors * 512; |
| 574 | ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); |
| 575 | if (ret < 0) |
| 576 | return ret; |
| 577 | else if (ret != len) |
| 578 | return -EIO; |
| 579 | else { |
| 580 | bs->wr_bytes += (unsigned) len; |
| 581 | bs->wr_ops ++; |
| 582 | return 0; |
| 583 | } |
| 584 | } else { |
| 585 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
| 590 | uint8_t *buf, int count1) |
| 591 | { |
| 592 | uint8_t tmp_buf[SECTOR_SIZE]; |
| 593 | int len, nb_sectors, count; |
| 594 | int64_t sector_num; |
| 595 | |
| 596 | count = count1; |
| 597 | /* first read to align to sector start */ |
| 598 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
| 599 | if (len > count) |
| 600 | len = count; |
| 601 | sector_num = offset >> SECTOR_BITS; |
| 602 | if (len > 0) { |
| 603 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 604 | return -EIO; |
| 605 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); |
| 606 | count -= len; |
| 607 | if (count == 0) |
| 608 | return count1; |
| 609 | sector_num++; |
| 610 | buf += len; |
| 611 | } |
| 612 | |
| 613 | /* read the sectors "in place" */ |
| 614 | nb_sectors = count >> SECTOR_BITS; |
| 615 | if (nb_sectors > 0) { |
| 616 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
| 617 | return -EIO; |
| 618 | sector_num += nb_sectors; |
| 619 | len = nb_sectors << SECTOR_BITS; |
| 620 | buf += len; |
| 621 | count -= len; |
| 622 | } |
| 623 | |
| 624 | /* add data from the last sector */ |
| 625 | if (count > 0) { |
| 626 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 627 | return -EIO; |
| 628 | memcpy(buf, tmp_buf, count); |
| 629 | } |
| 630 | return count1; |
| 631 | } |
| 632 | |
| 633 | static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
| 634 | const uint8_t *buf, int count1) |
| 635 | { |
| 636 | uint8_t tmp_buf[SECTOR_SIZE]; |
| 637 | int len, nb_sectors, count; |
| 638 | int64_t sector_num; |
| 639 | |
| 640 | count = count1; |
| 641 | /* first write to align to sector start */ |
| 642 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); |
| 643 | if (len > count) |
| 644 | len = count; |
| 645 | sector_num = offset >> SECTOR_BITS; |
| 646 | if (len > 0) { |
| 647 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 648 | return -EIO; |
| 649 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); |
| 650 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 651 | return -EIO; |
| 652 | count -= len; |
| 653 | if (count == 0) |
| 654 | return count1; |
| 655 | sector_num++; |
| 656 | buf += len; |
| 657 | } |
| 658 | |
| 659 | /* write the sectors "in place" */ |
| 660 | nb_sectors = count >> SECTOR_BITS; |
| 661 | if (nb_sectors > 0) { |
| 662 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
| 663 | return -EIO; |
| 664 | sector_num += nb_sectors; |
| 665 | len = nb_sectors << SECTOR_BITS; |
| 666 | buf += len; |
| 667 | count -= len; |
| 668 | } |
| 669 | |
| 670 | /* add data from the last sector */ |
| 671 | if (count > 0) { |
| 672 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 673 | return -EIO; |
| 674 | memcpy(tmp_buf, buf, count); |
| 675 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 676 | return -EIO; |
| 677 | } |
| 678 | return count1; |
| 679 | } |
| 680 | |
| 681 | /** |
| 682 | * Read with byte offsets (needed only for file protocols) |
| 683 | */ |
| 684 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
| 685 | void *buf1, int count1) |
| 686 | { |
| 687 | BlockDriver *drv = bs->drv; |
| 688 | |
| 689 | if (!drv) |
| 690 | return -ENOMEDIUM; |
| 691 | if (!drv->bdrv_pread) |
| 692 | return bdrv_pread_em(bs, offset, buf1, count1); |
| 693 | return drv->bdrv_pread(bs, offset, buf1, count1); |
| 694 | } |
| 695 | |
| 696 | /** |
| 697 | * Write with byte offsets (needed only for file protocols) |
| 698 | */ |
| 699 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
| 700 | const void *buf1, int count1) |
| 701 | { |
| 702 | BlockDriver *drv = bs->drv; |
| 703 | |
| 704 | if (!drv) |
| 705 | return -ENOMEDIUM; |
| 706 | if (!drv->bdrv_pwrite) |
| 707 | return bdrv_pwrite_em(bs, offset, buf1, count1); |
| 708 | return drv->bdrv_pwrite(bs, offset, buf1, count1); |
| 709 | } |
| 710 | |
| 711 | /** |
| 712 | * Truncate file to 'offset' bytes (needed only for file protocols) |
| 713 | */ |
| 714 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
| 715 | { |
| 716 | BlockDriver *drv = bs->drv; |
| 717 | if (!drv) |
| 718 | return -ENOMEDIUM; |
| 719 | if (!drv->bdrv_truncate) |
| 720 | return -ENOTSUP; |
| 721 | return drv->bdrv_truncate(bs, offset); |
| 722 | } |
| 723 | |
| 724 | /** |
| 725 | * Length of a file in bytes. Return < 0 if error or unknown. |
| 726 | */ |
| 727 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 728 | { |
| 729 | BlockDriver *drv = bs->drv; |
| 730 | if (!drv) |
| 731 | return -ENOMEDIUM; |
| 732 | if (!drv->bdrv_getlength) { |
| 733 | /* legacy mode */ |
| 734 | return bs->total_sectors * SECTOR_SIZE; |
| 735 | } |
| 736 | return drv->bdrv_getlength(bs); |
| 737 | } |
| 738 | |
| 739 | /* return 0 as number of sectors if no device present or error */ |
| 740 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
| 741 | { |
| 742 | int64_t length; |
| 743 | length = bdrv_getlength(bs); |
| 744 | if (length < 0) |
| 745 | length = 0; |
| 746 | else |
| 747 | length = length >> SECTOR_BITS; |
| 748 | *nb_sectors_ptr = length; |
| 749 | } |
| 750 | |
| 751 | /* force a given boot sector. */ |
| 752 | void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) |
| 753 | { |
| 754 | bs->boot_sector_enabled = 1; |
| 755 | if (size > 512) |
| 756 | size = 512; |
| 757 | memcpy(bs->boot_sector_data, data, size); |
| 758 | memset(bs->boot_sector_data + size, 0, 512 - size); |
| 759 | } |
| 760 | |
| 761 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
| 762 | int cyls, int heads, int secs) |
| 763 | { |
| 764 | bs->cyls = cyls; |
| 765 | bs->heads = heads; |
| 766 | bs->secs = secs; |
| 767 | } |
| 768 | |
| 769 | void bdrv_set_type_hint(BlockDriverState *bs, int type) |
| 770 | { |
| 771 | bs->type = type; |
| 772 | bs->removable = ((type == BDRV_TYPE_CDROM || |
| 773 | type == BDRV_TYPE_FLOPPY)); |
| 774 | } |
| 775 | |
| 776 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 777 | { |
| 778 | bs->translation = translation; |
| 779 | } |
| 780 | |
| 781 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
| 782 | int *pcyls, int *pheads, int *psecs) |
| 783 | { |
| 784 | *pcyls = bs->cyls; |
| 785 | *pheads = bs->heads; |
| 786 | *psecs = bs->secs; |
| 787 | } |
| 788 | |
| 789 | int bdrv_get_type_hint(BlockDriverState *bs) |
| 790 | { |
| 791 | return bs->type; |
| 792 | } |
| 793 | |
| 794 | int bdrv_get_translation_hint(BlockDriverState *bs) |
| 795 | { |
| 796 | return bs->translation; |
| 797 | } |
| 798 | |
| 799 | int bdrv_is_removable(BlockDriverState *bs) |
| 800 | { |
| 801 | return bs->removable; |
| 802 | } |
| 803 | |
| 804 | int bdrv_is_read_only(BlockDriverState *bs) |
| 805 | { |
| 806 | return bs->read_only; |
| 807 | } |
| 808 | |
| 809 | int bdrv_is_sg(BlockDriverState *bs) |
| 810 | { |
| 811 | return bs->sg; |
| 812 | } |
| 813 | |
| 814 | /* XXX: no longer used */ |
| 815 | void bdrv_set_change_cb(BlockDriverState *bs, |
| 816 | void (*change_cb)(void *opaque), void *opaque) |
| 817 | { |
| 818 | bs->change_cb = change_cb; |
| 819 | bs->change_opaque = opaque; |
| 820 | } |
| 821 | |
| 822 | int bdrv_is_encrypted(BlockDriverState *bs) |
| 823 | { |
| 824 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 825 | return 1; |
| 826 | return bs->encrypted; |
| 827 | } |
| 828 | |
| 829 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 830 | { |
| 831 | int ret; |
| 832 | if (bs->backing_hd && bs->backing_hd->encrypted) { |
| 833 | ret = bdrv_set_key(bs->backing_hd, key); |
| 834 | if (ret < 0) |
| 835 | return ret; |
| 836 | if (!bs->encrypted) |
| 837 | return 0; |
| 838 | } |
| 839 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) |
| 840 | return -1; |
| 841 | return bs->drv->bdrv_set_key(bs, key); |
| 842 | } |
| 843 | |
| 844 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 845 | { |
| 846 | if (!bs->drv) { |
| 847 | buf[0] = '\0'; |
| 848 | } else { |
| 849 | pstrcpy(buf, buf_size, bs->drv->format_name); |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 854 | void *opaque) |
| 855 | { |
| 856 | BlockDriver *drv; |
| 857 | |
| 858 | for (drv = first_drv; drv != NULL; drv = drv->next) { |
| 859 | it(opaque, drv->format_name); |
| 860 | } |
| 861 | } |
| 862 | |
| 863 | BlockDriverState *bdrv_find(const char *name) |
| 864 | { |
| 865 | BlockDriverState *bs; |
| 866 | |
| 867 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 868 | if (!strcmp(name, bs->device_name)) |
| 869 | return bs; |
| 870 | } |
| 871 | return NULL; |
| 872 | } |
| 873 | |
| 874 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
| 875 | { |
| 876 | BlockDriverState *bs; |
| 877 | |
| 878 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 879 | it(opaque, bs->device_name); |
| 880 | } |
| 881 | } |
| 882 | |
| 883 | const char *bdrv_get_device_name(BlockDriverState *bs) |
| 884 | { |
| 885 | return bs->device_name; |
| 886 | } |
| 887 | |
| 888 | void bdrv_flush(BlockDriverState *bs) |
| 889 | { |
| 890 | if (bs->drv->bdrv_flush) |
| 891 | bs->drv->bdrv_flush(bs); |
| 892 | if (bs->backing_hd) |
| 893 | bdrv_flush(bs->backing_hd); |
| 894 | } |
| 895 | |
| 896 | /* |
| 897 | * Returns true iff the specified sector is present in the disk image. Drivers |
| 898 | * not implementing the functionality are assumed to not support backing files, |
| 899 | * hence all their sectors are reported as allocated. |
| 900 | * |
| 901 | * 'pnum' is set to the number of sectors (including and immediately following |
| 902 | * the specified sector) that are known to be in the same |
| 903 | * allocated/unallocated state. |
| 904 | * |
| 905 | * 'nb_sectors' is the max value 'pnum' should be set to. |
| 906 | */ |
| 907 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 908 | int *pnum) |
| 909 | { |
| 910 | int64_t n; |
| 911 | if (!bs->drv->bdrv_is_allocated) { |
| 912 | if (sector_num >= bs->total_sectors) { |
| 913 | *pnum = 0; |
| 914 | return 0; |
| 915 | } |
| 916 | n = bs->total_sectors - sector_num; |
| 917 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
| 918 | return 1; |
| 919 | } |
| 920 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); |
| 921 | } |
| 922 | |
| 923 | void bdrv_info(void) |
| 924 | { |
| 925 | BlockDriverState *bs; |
| 926 | |
| 927 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 928 | term_printf("%s:", bs->device_name); |
| 929 | term_printf(" type="); |
| 930 | switch(bs->type) { |
| 931 | case BDRV_TYPE_HD: |
| 932 | term_printf("hd"); |
| 933 | break; |
| 934 | case BDRV_TYPE_CDROM: |
| 935 | term_printf("cdrom"); |
| 936 | break; |
| 937 | case BDRV_TYPE_FLOPPY: |
| 938 | term_printf("floppy"); |
| 939 | break; |
| 940 | } |
| 941 | term_printf(" removable=%d", bs->removable); |
| 942 | if (bs->removable) { |
| 943 | term_printf(" locked=%d", bs->locked); |
| 944 | } |
| 945 | if (bs->drv) { |
| 946 | term_printf(" file="); |
| 947 | term_print_filename(bs->filename); |
| 948 | if (bs->backing_file[0] != '\0') { |
| 949 | term_printf(" backing_file="); |
| 950 | term_print_filename(bs->backing_file); |
| 951 | } |
| 952 | term_printf(" ro=%d", bs->read_only); |
| 953 | term_printf(" drv=%s", bs->drv->format_name); |
| 954 | if (bs->encrypted) |
| 955 | term_printf(" encrypted"); |
| 956 | } else { |
| 957 | term_printf(" [not inserted]"); |
| 958 | } |
| 959 | term_printf("\n"); |
| 960 | } |
| 961 | } |
| 962 | |
| 963 | /* The "info blockstats" command. */ |
| 964 | void bdrv_info_stats (void) |
| 965 | { |
| 966 | BlockDriverState *bs; |
| 967 | |
| 968 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 969 | term_printf ("%s:" |
| 970 | " rd_bytes=%" PRIu64 |
| 971 | " wr_bytes=%" PRIu64 |
| 972 | " rd_operations=%" PRIu64 |
| 973 | " wr_operations=%" PRIu64 |
| 974 | "\n", |
| 975 | bs->device_name, |
| 976 | bs->rd_bytes, bs->wr_bytes, |
| 977 | bs->rd_ops, bs->wr_ops); |
| 978 | } |
| 979 | } |
| 980 | |
| 981 | void bdrv_get_backing_filename(BlockDriverState *bs, |
| 982 | char *filename, int filename_size) |
| 983 | { |
| 984 | if (!bs->backing_hd) { |
| 985 | pstrcpy(filename, filename_size, ""); |
| 986 | } else { |
| 987 | pstrcpy(filename, filename_size, bs->backing_file); |
| 988 | } |
| 989 | } |
| 990 | |
| 991 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
| 992 | const uint8_t *buf, int nb_sectors) |
| 993 | { |
| 994 | BlockDriver *drv = bs->drv; |
| 995 | if (!drv) |
| 996 | return -ENOMEDIUM; |
| 997 | if (!drv->bdrv_write_compressed) |
| 998 | return -ENOTSUP; |
| 999 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
| 1000 | } |
| 1001 | |
| 1002 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 1003 | { |
| 1004 | BlockDriver *drv = bs->drv; |
| 1005 | if (!drv) |
| 1006 | return -ENOMEDIUM; |
| 1007 | if (!drv->bdrv_get_info) |
| 1008 | return -ENOTSUP; |
| 1009 | memset(bdi, 0, sizeof(*bdi)); |
| 1010 | return drv->bdrv_get_info(bs, bdi); |
| 1011 | } |
| 1012 | |
| 1013 | /**************************************************************/ |
| 1014 | /* handling of snapshots */ |
| 1015 | |
| 1016 | int bdrv_snapshot_create(BlockDriverState *bs, |
| 1017 | QEMUSnapshotInfo *sn_info) |
| 1018 | { |
| 1019 | BlockDriver *drv = bs->drv; |
| 1020 | if (!drv) |
| 1021 | return -ENOMEDIUM; |
| 1022 | if (!drv->bdrv_snapshot_create) |
| 1023 | return -ENOTSUP; |
| 1024 | return drv->bdrv_snapshot_create(bs, sn_info); |
| 1025 | } |
| 1026 | |
| 1027 | int bdrv_snapshot_goto(BlockDriverState *bs, |
| 1028 | const char *snapshot_id) |
| 1029 | { |
| 1030 | BlockDriver *drv = bs->drv; |
| 1031 | if (!drv) |
| 1032 | return -ENOMEDIUM; |
| 1033 | if (!drv->bdrv_snapshot_goto) |
| 1034 | return -ENOTSUP; |
| 1035 | return drv->bdrv_snapshot_goto(bs, snapshot_id); |
| 1036 | } |
| 1037 | |
| 1038 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 1039 | { |
| 1040 | BlockDriver *drv = bs->drv; |
| 1041 | if (!drv) |
| 1042 | return -ENOMEDIUM; |
| 1043 | if (!drv->bdrv_snapshot_delete) |
| 1044 | return -ENOTSUP; |
| 1045 | return drv->bdrv_snapshot_delete(bs, snapshot_id); |
| 1046 | } |
| 1047 | |
| 1048 | int bdrv_snapshot_list(BlockDriverState *bs, |
| 1049 | QEMUSnapshotInfo **psn_info) |
| 1050 | { |
| 1051 | BlockDriver *drv = bs->drv; |
| 1052 | if (!drv) |
| 1053 | return -ENOMEDIUM; |
| 1054 | if (!drv->bdrv_snapshot_list) |
| 1055 | return -ENOTSUP; |
| 1056 | return drv->bdrv_snapshot_list(bs, psn_info); |
| 1057 | } |
| 1058 | |
| 1059 | #define NB_SUFFIXES 4 |
| 1060 | |
| 1061 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 1062 | { |
| 1063 | static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 1064 | int64_t base; |
| 1065 | int i; |
| 1066 | |
| 1067 | if (size <= 999) { |
| 1068 | snprintf(buf, buf_size, "%" PRId64, size); |
| 1069 | } else { |
| 1070 | base = 1024; |
| 1071 | for(i = 0; i < NB_SUFFIXES; i++) { |
| 1072 | if (size < (10 * base)) { |
| 1073 | snprintf(buf, buf_size, "%0.1f%c", |
| 1074 | (double)size / base, |
| 1075 | suffixes[i]); |
| 1076 | break; |
| 1077 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 1078 | snprintf(buf, buf_size, "%" PRId64 "%c", |
| 1079 | ((size + (base >> 1)) / base), |
| 1080 | suffixes[i]); |
| 1081 | break; |
| 1082 | } |
| 1083 | base = base * 1024; |
| 1084 | } |
| 1085 | } |
| 1086 | return buf; |
| 1087 | } |
| 1088 | |
| 1089 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 1090 | { |
| 1091 | char buf1[128], date_buf[128], clock_buf[128]; |
| 1092 | #ifdef _WIN32 |
| 1093 | struct tm *ptm; |
| 1094 | #else |
| 1095 | struct tm tm; |
| 1096 | #endif |
| 1097 | time_t ti; |
| 1098 | int64_t secs; |
| 1099 | |
| 1100 | if (!sn) { |
| 1101 | snprintf(buf, buf_size, |
| 1102 | "%-10s%-20s%7s%20s%15s", |
| 1103 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 1104 | } else { |
| 1105 | ti = sn->date_sec; |
| 1106 | #ifdef _WIN32 |
| 1107 | ptm = localtime(&ti); |
| 1108 | strftime(date_buf, sizeof(date_buf), |
| 1109 | "%Y-%m-%d %H:%M:%S", ptm); |
| 1110 | #else |
| 1111 | localtime_r(&ti, &tm); |
| 1112 | strftime(date_buf, sizeof(date_buf), |
| 1113 | "%Y-%m-%d %H:%M:%S", &tm); |
| 1114 | #endif |
| 1115 | secs = sn->vm_clock_nsec / 1000000000; |
| 1116 | snprintf(clock_buf, sizeof(clock_buf), |
| 1117 | "%02d:%02d:%02d.%03d", |
| 1118 | (int)(secs / 3600), |
| 1119 | (int)((secs / 60) % 60), |
| 1120 | (int)(secs % 60), |
| 1121 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 1122 | snprintf(buf, buf_size, |
| 1123 | "%-10s%-20s%7s%20s%15s", |
| 1124 | sn->id_str, sn->name, |
| 1125 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), |
| 1126 | date_buf, |
| 1127 | clock_buf); |
| 1128 | } |
| 1129 | return buf; |
| 1130 | } |
| 1131 | |
| 1132 | |
| 1133 | /**************************************************************/ |
| 1134 | /* async I/Os */ |
| 1135 | |
| 1136 | BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
| 1137 | uint8_t *buf, int nb_sectors, |
| 1138 | BlockDriverCompletionFunc *cb, void *opaque) |
| 1139 | { |
| 1140 | BlockDriver *drv = bs->drv; |
| 1141 | BlockDriverAIOCB *ret; |
| 1142 | |
| 1143 | if (!drv) |
| 1144 | return NULL; |
| 1145 | |
| 1146 | /* XXX: we assume that nb_sectors == 0 is suppored by the async read */ |
| 1147 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 1148 | memcpy(buf, bs->boot_sector_data, 512); |
| 1149 | sector_num++; |
| 1150 | nb_sectors--; |
| 1151 | buf += 512; |
| 1152 | } |
| 1153 | |
| 1154 | ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 1155 | |
| 1156 | if (ret) { |
| 1157 | /* Update stats even though technically transfer has not happened. */ |
| 1158 | bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
| 1159 | bs->rd_ops ++; |
| 1160 | } |
| 1161 | |
| 1162 | return ret; |
| 1163 | } |
| 1164 | |
| 1165 | BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
| 1166 | const uint8_t *buf, int nb_sectors, |
| 1167 | BlockDriverCompletionFunc *cb, void *opaque) |
| 1168 | { |
| 1169 | BlockDriver *drv = bs->drv; |
| 1170 | BlockDriverAIOCB *ret; |
| 1171 | |
| 1172 | if (!drv) |
| 1173 | return NULL; |
| 1174 | if (bs->read_only) |
| 1175 | return NULL; |
| 1176 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
| 1177 | memcpy(bs->boot_sector_data, buf, 512); |
| 1178 | } |
| 1179 | |
| 1180 | ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 1181 | |
| 1182 | if (ret) { |
| 1183 | /* Update stats even though technically transfer has not happened. */ |
| 1184 | bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; |
| 1185 | bs->wr_ops ++; |
| 1186 | } |
| 1187 | |
| 1188 | return ret; |
| 1189 | } |
| 1190 | |
| 1191 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
| 1192 | { |
| 1193 | BlockDriver *drv = acb->bs->drv; |
| 1194 | |
| 1195 | drv->bdrv_aio_cancel(acb); |
| 1196 | } |
| 1197 | |
| 1198 | |
| 1199 | /**************************************************************/ |
| 1200 | /* async block device emulation */ |
| 1201 | |
| 1202 | static void bdrv_aio_bh_cb(void *opaque) |
| 1203 | { |
| 1204 | BlockDriverAIOCBSync *acb = opaque; |
| 1205 | acb->common.cb(acb->common.opaque, acb->ret); |
| 1206 | qemu_aio_release(acb); |
| 1207 | } |
| 1208 | |
| 1209 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
| 1210 | int64_t sector_num, uint8_t *buf, int nb_sectors, |
| 1211 | BlockDriverCompletionFunc *cb, void *opaque) |
| 1212 | { |
| 1213 | BlockDriverAIOCBSync *acb; |
| 1214 | int ret; |
| 1215 | |
| 1216 | acb = qemu_aio_get(bs, cb, opaque); |
| 1217 | if (!acb->bh) |
| 1218 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1219 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
| 1220 | acb->ret = ret; |
| 1221 | qemu_bh_schedule(acb->bh); |
| 1222 | return &acb->common; |
| 1223 | } |
| 1224 | |
| 1225 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
| 1226 | int64_t sector_num, const uint8_t *buf, int nb_sectors, |
| 1227 | BlockDriverCompletionFunc *cb, void *opaque) |
| 1228 | { |
| 1229 | BlockDriverAIOCBSync *acb; |
| 1230 | int ret; |
| 1231 | |
| 1232 | acb = qemu_aio_get(bs, cb, opaque); |
| 1233 | if (!acb->bh) |
| 1234 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1235 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
| 1236 | acb->ret = ret; |
| 1237 | qemu_bh_schedule(acb->bh); |
| 1238 | return &acb->common; |
| 1239 | } |
| 1240 | |
| 1241 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 1242 | { |
| 1243 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
| 1244 | qemu_bh_cancel(acb->bh); |
| 1245 | qemu_aio_release(acb); |
| 1246 | } |
| 1247 | |
| 1248 | /**************************************************************/ |
| 1249 | /* sync block device emulation */ |
| 1250 | |
| 1251 | static void bdrv_rw_em_cb(void *opaque, int ret) |
| 1252 | { |
| 1253 | *(int *)opaque = ret; |
| 1254 | } |
| 1255 | |
| 1256 | #define NOT_DONE 0x7fffffff |
| 1257 | |
| 1258 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 1259 | uint8_t *buf, int nb_sectors) |
| 1260 | { |
| 1261 | int async_ret; |
| 1262 | BlockDriverAIOCB *acb; |
| 1263 | |
| 1264 | async_ret = NOT_DONE; |
| 1265 | acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
| 1266 | bdrv_rw_em_cb, &async_ret); |
| 1267 | if (acb == NULL) |
| 1268 | return -1; |
| 1269 | |
| 1270 | while (async_ret == NOT_DONE) { |
| 1271 | qemu_aio_wait(); |
| 1272 | } |
| 1273 | |
| 1274 | return async_ret; |
| 1275 | } |
| 1276 | |
| 1277 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 1278 | const uint8_t *buf, int nb_sectors) |
| 1279 | { |
| 1280 | int async_ret; |
| 1281 | BlockDriverAIOCB *acb; |
| 1282 | |
| 1283 | async_ret = NOT_DONE; |
| 1284 | acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
| 1285 | bdrv_rw_em_cb, &async_ret); |
| 1286 | if (acb == NULL) |
| 1287 | return -1; |
| 1288 | while (async_ret == NOT_DONE) { |
| 1289 | qemu_aio_wait(); |
| 1290 | } |
| 1291 | return async_ret; |
| 1292 | } |
| 1293 | |
| 1294 | void bdrv_init(void) |
| 1295 | { |
| 1296 | bdrv_register(&bdrv_raw); |
| 1297 | bdrv_register(&bdrv_host_device); |
| 1298 | #ifndef _WIN32 |
| 1299 | bdrv_register(&bdrv_cow); |
| 1300 | #endif |
| 1301 | bdrv_register(&bdrv_qcow); |
| 1302 | #if 0 |
| 1303 | bdrv_register(&bdrv_vmdk); |
| 1304 | #endif |
| 1305 | bdrv_register(&bdrv_cloop); |
| 1306 | bdrv_register(&bdrv_dmg); |
| 1307 | #if 0 |
| 1308 | bdrv_register(&bdrv_bochs); |
| 1309 | bdrv_register(&bdrv_vpc); |
| 1310 | #endif |
| 1311 | bdrv_register(&bdrv_vvfat); |
| 1312 | #if 0 |
| 1313 | bdrv_register(&bdrv_qcow2); |
| 1314 | bdrv_register(&bdrv_parallels); |
| 1315 | bdrv_register(&bdrv_nbd); |
| 1316 | #endif |
| 1317 | qemu_aio_init(); |
| 1318 | } |
| 1319 | |
| 1320 | void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, |
| 1321 | void *opaque) |
| 1322 | { |
| 1323 | BlockDriver *drv; |
| 1324 | BlockDriverAIOCB *acb; |
| 1325 | |
| 1326 | drv = bs->drv; |
| 1327 | if (drv->free_aiocb) { |
| 1328 | acb = drv->free_aiocb; |
| 1329 | drv->free_aiocb = acb->next; |
| 1330 | } else { |
| 1331 | acb = qemu_mallocz(drv->aiocb_size); |
| 1332 | if (!acb) |
| 1333 | return NULL; |
| 1334 | } |
| 1335 | acb->bs = bs; |
| 1336 | acb->cb = cb; |
| 1337 | acb->opaque = opaque; |
| 1338 | return acb; |
| 1339 | } |
| 1340 | |
| 1341 | void qemu_aio_release(void *p) |
| 1342 | { |
| 1343 | BlockDriverAIOCB *acb = p; |
| 1344 | BlockDriver *drv = acb->bs->drv; |
| 1345 | acb->next = drv->free_aiocb; |
| 1346 | drv->free_aiocb = acb; |
| 1347 | } |
| 1348 | |
| 1349 | /**************************************************************/ |
| 1350 | /* removable device support */ |
| 1351 | |
| 1352 | /** |
| 1353 | * Return TRUE if the media is present |
| 1354 | */ |
| 1355 | int bdrv_is_inserted(BlockDriverState *bs) |
| 1356 | { |
| 1357 | BlockDriver *drv = bs->drv; |
| 1358 | int ret; |
| 1359 | if (!drv) |
| 1360 | return 0; |
| 1361 | if (!drv->bdrv_is_inserted) |
| 1362 | return 1; |
| 1363 | ret = drv->bdrv_is_inserted(bs); |
| 1364 | return ret; |
| 1365 | } |
| 1366 | |
| 1367 | /** |
| 1368 | * Return TRUE if the media changed since the last call to this |
| 1369 | * function. It is currently only used for floppy disks |
| 1370 | */ |
| 1371 | int bdrv_media_changed(BlockDriverState *bs) |
| 1372 | { |
| 1373 | BlockDriver *drv = bs->drv; |
| 1374 | int ret; |
| 1375 | |
| 1376 | if (!drv || !drv->bdrv_media_changed) |
| 1377 | ret = -ENOTSUP; |
| 1378 | else |
| 1379 | ret = drv->bdrv_media_changed(bs); |
| 1380 | if (ret == -ENOTSUP) |
| 1381 | ret = bs->media_changed; |
| 1382 | bs->media_changed = 0; |
| 1383 | return ret; |
| 1384 | } |
| 1385 | |
| 1386 | /** |
| 1387 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 1388 | */ |
| 1389 | void bdrv_eject(BlockDriverState *bs, int eject_flag) |
| 1390 | { |
| 1391 | BlockDriver *drv = bs->drv; |
| 1392 | int ret; |
| 1393 | |
| 1394 | if (!drv || !drv->bdrv_eject) { |
| 1395 | ret = -ENOTSUP; |
| 1396 | } else { |
| 1397 | ret = drv->bdrv_eject(bs, eject_flag); |
| 1398 | } |
| 1399 | if (ret == -ENOTSUP) { |
| 1400 | if (eject_flag) |
| 1401 | bdrv_close(bs); |
| 1402 | } |
| 1403 | } |
| 1404 | |
| 1405 | int bdrv_is_locked(BlockDriverState *bs) |
| 1406 | { |
| 1407 | return bs->locked; |
| 1408 | } |
| 1409 | |
| 1410 | /** |
| 1411 | * Lock or unlock the media (if it is locked, the user won't be able |
| 1412 | * to eject it manually). |
| 1413 | */ |
| 1414 | void bdrv_set_locked(BlockDriverState *bs, int locked) |
| 1415 | { |
| 1416 | BlockDriver *drv = bs->drv; |
| 1417 | |
| 1418 | bs->locked = locked; |
| 1419 | if (drv && drv->bdrv_set_locked) { |
| 1420 | drv->bdrv_set_locked(bs, locked); |
| 1421 | } |
| 1422 | } |
| 1423 | |
| 1424 | /* needed for generic scsi interface */ |
| 1425 | |
| 1426 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 1427 | { |
| 1428 | BlockDriver *drv = bs->drv; |
| 1429 | |
| 1430 | if (drv && drv->bdrv_ioctl) |
| 1431 | return drv->bdrv_ioctl(bs, req, buf); |
| 1432 | return -ENOTSUP; |
| 1433 | } |