1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2017 Peter Lieven <pl@kamp.de> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 28 #include <poll.h> 29 #include <math.h> 30 #include <arpa/inet.h> 31 #include "qemu/config-file.h" 32 #include "qemu/error-report.h" 33 #include "qemu/bitops.h" 34 #include "qemu/bitmap.h" 35 #include "block/block_int.h" 36 #include "block/qdict.h" 37 #include "scsi/constants.h" 38 #include "qemu/iov.h" 39 #include "qemu/option.h" 40 #include "qemu/uuid.h" 41 #include "qapi/error.h" 42 #include "qapi/qapi-commands-misc.h" 43 #include "qapi/qmp/qdict.h" 44 #include "qapi/qmp/qstring.h" 45 #include "crypto/secret.h" 46 #include "scsi/utils.h" 47 48 /* Conflict between scsi/utils.h and libiscsi! :( */ 49 #define SCSI_XFER_NONE ISCSI_XFER_NONE 50 #include <iscsi/iscsi.h> 51 #include <iscsi/scsi-lowlevel.h> 52 #undef SCSI_XFER_NONE 53 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 54 55 #ifdef __linux__ 56 #include <scsi/sg.h> 57 #endif 58 59 typedef struct IscsiLun { 60 struct iscsi_context *iscsi; 61 AioContext *aio_context; 62 int lun; 63 enum scsi_inquiry_peripheral_device_type type; 64 int block_size; 65 uint64_t num_blocks; 66 int events; 67 QEMUTimer *nop_timer; 68 QEMUTimer *event_timer; 69 QemuMutex mutex; 70 struct scsi_inquiry_logical_block_provisioning lbp; 71 struct scsi_inquiry_block_limits bl; 72 struct scsi_inquiry_device_designator *dd; 73 unsigned char *zeroblock; 74 /* The allocmap tracks which clusters (pages) on the iSCSI target are 75 * allocated and which are not. In case a target returns zeros for 76 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 77 * of reading zeros over the wire if a read request falls within an 78 * unallocated block. As there are 3 possible states we need 2 bitmaps to 79 * track. allocmap_valid keeps track if QEMU's information about a page is 80 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 81 * valid information about a page the corresponding allocmap entry should be 82 * switched to unallocated as well to force a new lookup of the allocation 83 * status as lookups are generally skipped if a page is suspect to be 84 * allocated. If a iSCSI target is opened with cache.direct = on the 85 * allocmap_valid does not exist turning all cached information invalid so 86 * that a fresh lookup is made for any page even if allocmap entry returns 87 * it's unallocated. */ 88 unsigned long *allocmap; 89 unsigned long *allocmap_valid; 90 long allocmap_size; 91 int cluster_size; 92 bool use_16_for_rw; 93 bool write_protected; 94 bool lbpme; 95 bool lbprz; 96 bool dpofua; 97 bool has_write_same; 98 bool request_timed_out; 99 } IscsiLun; 100 101 typedef struct IscsiTask { 102 int status; 103 int complete; 104 int retries; 105 int do_retry; 106 struct scsi_task *task; 107 Coroutine *co; 108 IscsiLun *iscsilun; 109 QEMUTimer retry_timer; 110 int err_code; 111 char *err_str; 112 } IscsiTask; 113 114 typedef struct IscsiAIOCB { 115 BlockAIOCB common; 116 QEMUBH *bh; 117 IscsiLun *iscsilun; 118 struct scsi_task *task; 119 uint8_t *buf; 120 int status; 121 int64_t sector_num; 122 int nb_sectors; 123 int ret; 124 #ifdef __linux__ 125 sg_io_hdr_t *ioh; 126 #endif 127 } IscsiAIOCB; 128 129 /* libiscsi uses time_t so its enough to process events every second */ 130 #define EVENT_INTERVAL 1000 131 #define NOP_INTERVAL 5000 132 #define MAX_NOP_FAILURES 3 133 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 134 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 135 136 /* this threshold is a trade-off knob to choose between 137 * the potential additional overhead of an extra GET_LBA_STATUS request 138 * vs. unnecessarily reading a lot of zero sectors over the wire. 139 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 140 * sectors we check the allocation status of the area covered by the 141 * request first if the allocationmap indicates that the area might be 142 * unallocated. */ 143 #define ISCSI_CHECKALLOC_THRES 64 144 145 static void 146 iscsi_bh_cb(void *p) 147 { 148 IscsiAIOCB *acb = p; 149 150 qemu_bh_delete(acb->bh); 151 152 g_free(acb->buf); 153 acb->buf = NULL; 154 155 acb->common.cb(acb->common.opaque, acb->status); 156 157 if (acb->task != NULL) { 158 scsi_free_scsi_task(acb->task); 159 acb->task = NULL; 160 } 161 162 qemu_aio_unref(acb); 163 } 164 165 static void 166 iscsi_schedule_bh(IscsiAIOCB *acb) 167 { 168 if (acb->bh) { 169 return; 170 } 171 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 172 qemu_bh_schedule(acb->bh); 173 } 174 175 static void iscsi_co_generic_bh_cb(void *opaque) 176 { 177 struct IscsiTask *iTask = opaque; 178 179 iTask->complete = 1; 180 aio_co_wake(iTask->co); 181 } 182 183 static void iscsi_retry_timer_expired(void *opaque) 184 { 185 struct IscsiTask *iTask = opaque; 186 iTask->complete = 1; 187 if (iTask->co) { 188 aio_co_wake(iTask->co); 189 } 190 } 191 192 static inline unsigned exp_random(double mean) 193 { 194 return -mean * log((double)rand() / RAND_MAX); 195 } 196 197 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 198 * libiscsi 1.10.0, together with other constants we need. Use it as 199 * a hint that we have to define them ourselves if needed, to keep the 200 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 201 * the test because SCSI_STATUS_* is an enum. 202 * 203 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 204 * an enum, check against the LIBISCSI_API_VERSION macro, which was 205 * introduced in 1.11.0. If it is present, there is no need to define 206 * anything. 207 */ 208 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 209 !defined(LIBISCSI_API_VERSION) 210 #define SCSI_STATUS_TASK_SET_FULL 0x28 211 #define SCSI_STATUS_TIMEOUT 0x0f000002 212 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 213 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 214 #endif 215 216 #ifndef LIBISCSI_API_VERSION 217 #define LIBISCSI_API_VERSION 20130701 218 #endif 219 220 static int iscsi_translate_sense(struct scsi_sense *sense) 221 { 222 return - scsi_sense_to_errno(sense->key, 223 (sense->ascq & 0xFF00) >> 8, 224 sense->ascq & 0xFF); 225 } 226 227 /* Called (via iscsi_service) with QemuMutex held. */ 228 static void 229 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 230 void *command_data, void *opaque) 231 { 232 struct IscsiTask *iTask = opaque; 233 struct scsi_task *task = command_data; 234 235 iTask->status = status; 236 iTask->do_retry = 0; 237 iTask->task = task; 238 239 if (status != SCSI_STATUS_GOOD) { 240 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 241 if (status == SCSI_STATUS_CHECK_CONDITION 242 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 243 error_report("iSCSI CheckCondition: %s", 244 iscsi_get_error(iscsi)); 245 iTask->do_retry = 1; 246 goto out; 247 } 248 if (status == SCSI_STATUS_BUSY || 249 status == SCSI_STATUS_TIMEOUT || 250 status == SCSI_STATUS_TASK_SET_FULL) { 251 unsigned retry_time = 252 exp_random(iscsi_retry_times[iTask->retries - 1]); 253 if (status == SCSI_STATUS_TIMEOUT) { 254 /* make sure the request is rescheduled AFTER the 255 * reconnect is initiated */ 256 retry_time = EVENT_INTERVAL * 2; 257 iTask->iscsilun->request_timed_out = true; 258 } 259 error_report("iSCSI Busy/TaskSetFull/TimeOut" 260 " (retry #%u in %u ms): %s", 261 iTask->retries, retry_time, 262 iscsi_get_error(iscsi)); 263 aio_timer_init(iTask->iscsilun->aio_context, 264 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 265 SCALE_MS, iscsi_retry_timer_expired, iTask); 266 timer_mod(&iTask->retry_timer, 267 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 268 iTask->do_retry = 1; 269 return; 270 } 271 } 272 iTask->err_code = iscsi_translate_sense(&task->sense); 273 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 274 } 275 276 out: 277 if (iTask->co) { 278 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 279 iscsi_co_generic_bh_cb, iTask); 280 } else { 281 iTask->complete = 1; 282 } 283 } 284 285 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 286 { 287 *iTask = (struct IscsiTask) { 288 .co = qemu_coroutine_self(), 289 .iscsilun = iscsilun, 290 }; 291 } 292 293 static void 294 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 295 void *private_data) 296 { 297 IscsiAIOCB *acb = private_data; 298 299 acb->status = -ECANCELED; 300 iscsi_schedule_bh(acb); 301 } 302 303 static void 304 iscsi_aio_cancel(BlockAIOCB *blockacb) 305 { 306 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 307 IscsiLun *iscsilun = acb->iscsilun; 308 309 if (acb->status != -EINPROGRESS) { 310 return; 311 } 312 313 /* send a task mgmt call to the target to cancel the task on the target */ 314 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 315 iscsi_abort_task_cb, acb); 316 317 } 318 319 static const AIOCBInfo iscsi_aiocb_info = { 320 .aiocb_size = sizeof(IscsiAIOCB), 321 .cancel_async = iscsi_aio_cancel, 322 }; 323 324 325 static void iscsi_process_read(void *arg); 326 static void iscsi_process_write(void *arg); 327 328 /* Called with QemuMutex held. */ 329 static void 330 iscsi_set_events(IscsiLun *iscsilun) 331 { 332 struct iscsi_context *iscsi = iscsilun->iscsi; 333 int ev = iscsi_which_events(iscsi); 334 335 if (ev != iscsilun->events) { 336 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 337 false, 338 (ev & POLLIN) ? iscsi_process_read : NULL, 339 (ev & POLLOUT) ? iscsi_process_write : NULL, 340 NULL, 341 iscsilun); 342 iscsilun->events = ev; 343 } 344 } 345 346 static void iscsi_timed_check_events(void *opaque) 347 { 348 IscsiLun *iscsilun = opaque; 349 350 /* check for timed out requests */ 351 iscsi_service(iscsilun->iscsi, 0); 352 353 if (iscsilun->request_timed_out) { 354 iscsilun->request_timed_out = false; 355 iscsi_reconnect(iscsilun->iscsi); 356 } 357 358 /* newer versions of libiscsi may return zero events. Ensure we are able 359 * to return to service once this situation changes. */ 360 iscsi_set_events(iscsilun); 361 362 timer_mod(iscsilun->event_timer, 363 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 364 } 365 366 static void 367 iscsi_process_read(void *arg) 368 { 369 IscsiLun *iscsilun = arg; 370 struct iscsi_context *iscsi = iscsilun->iscsi; 371 372 qemu_mutex_lock(&iscsilun->mutex); 373 iscsi_service(iscsi, POLLIN); 374 iscsi_set_events(iscsilun); 375 qemu_mutex_unlock(&iscsilun->mutex); 376 } 377 378 static void 379 iscsi_process_write(void *arg) 380 { 381 IscsiLun *iscsilun = arg; 382 struct iscsi_context *iscsi = iscsilun->iscsi; 383 384 qemu_mutex_lock(&iscsilun->mutex); 385 iscsi_service(iscsi, POLLOUT); 386 iscsi_set_events(iscsilun); 387 qemu_mutex_unlock(&iscsilun->mutex); 388 } 389 390 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 391 { 392 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 393 } 394 395 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 396 { 397 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 398 } 399 400 static bool is_byte_request_lun_aligned(int64_t offset, int count, 401 IscsiLun *iscsilun) 402 { 403 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 404 error_report("iSCSI misaligned request: " 405 "iscsilun->block_size %u, offset %" PRIi64 406 ", count %d", 407 iscsilun->block_size, offset, count); 408 return false; 409 } 410 return true; 411 } 412 413 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 414 IscsiLun *iscsilun) 415 { 416 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 417 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 418 nb_sectors << BDRV_SECTOR_BITS, 419 iscsilun); 420 } 421 422 static void iscsi_allocmap_free(IscsiLun *iscsilun) 423 { 424 g_free(iscsilun->allocmap); 425 g_free(iscsilun->allocmap_valid); 426 iscsilun->allocmap = NULL; 427 iscsilun->allocmap_valid = NULL; 428 } 429 430 431 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 432 { 433 iscsi_allocmap_free(iscsilun); 434 435 assert(iscsilun->cluster_size); 436 iscsilun->allocmap_size = 437 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 438 iscsilun->cluster_size); 439 440 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 441 if (!iscsilun->allocmap) { 442 return -ENOMEM; 443 } 444 445 if (open_flags & BDRV_O_NOCACHE) { 446 /* when cache.direct = on all allocmap entries are 447 * treated as invalid to force a relookup of the block 448 * status on every read request */ 449 return 0; 450 } 451 452 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 453 if (!iscsilun->allocmap_valid) { 454 /* if we are under memory pressure free the allocmap as well */ 455 iscsi_allocmap_free(iscsilun); 456 return -ENOMEM; 457 } 458 459 return 0; 460 } 461 462 static void 463 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 464 int64_t bytes, bool allocated, bool valid) 465 { 466 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 467 468 if (iscsilun->allocmap == NULL) { 469 return; 470 } 471 /* expand to entirely contain all affected clusters */ 472 assert(iscsilun->cluster_size); 473 cl_num_expanded = offset / iscsilun->cluster_size; 474 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 475 iscsilun->cluster_size) - cl_num_expanded; 476 /* shrink to touch only completely contained clusters */ 477 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 478 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 479 if (allocated) { 480 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 481 } else { 482 if (nb_cls_shrunk > 0) { 483 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 484 } 485 } 486 487 if (iscsilun->allocmap_valid == NULL) { 488 return; 489 } 490 if (valid) { 491 if (nb_cls_shrunk > 0) { 492 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 493 } 494 } else { 495 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 496 nb_cls_expanded); 497 } 498 } 499 500 static void 501 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 502 int64_t bytes) 503 { 504 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 505 } 506 507 static void 508 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 509 int64_t bytes) 510 { 511 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 512 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 513 */ 514 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 515 } 516 517 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 518 int64_t bytes) 519 { 520 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 521 } 522 523 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 524 { 525 if (iscsilun->allocmap) { 526 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 527 } 528 if (iscsilun->allocmap_valid) { 529 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 530 } 531 } 532 533 static inline bool 534 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 535 int64_t bytes) 536 { 537 unsigned long size; 538 if (iscsilun->allocmap == NULL) { 539 return true; 540 } 541 assert(iscsilun->cluster_size); 542 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 543 return !(find_next_bit(iscsilun->allocmap, size, 544 offset / iscsilun->cluster_size) == size); 545 } 546 547 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 548 int64_t offset, int64_t bytes) 549 { 550 unsigned long size; 551 if (iscsilun->allocmap_valid == NULL) { 552 return false; 553 } 554 assert(iscsilun->cluster_size); 555 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 556 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 557 offset / iscsilun->cluster_size) == size); 558 } 559 560 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 561 IscsiLun *iscsilun) 562 { 563 while (!iTask->complete) { 564 iscsi_set_events(iscsilun); 565 qemu_mutex_unlock(&iscsilun->mutex); 566 qemu_coroutine_yield(); 567 qemu_mutex_lock(&iscsilun->mutex); 568 } 569 } 570 571 static int coroutine_fn 572 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 573 QEMUIOVector *iov, int flags) 574 { 575 IscsiLun *iscsilun = bs->opaque; 576 struct IscsiTask iTask; 577 uint64_t lba; 578 uint32_t num_sectors; 579 bool fua = flags & BDRV_REQ_FUA; 580 int r = 0; 581 582 if (fua) { 583 assert(iscsilun->dpofua); 584 } 585 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 586 return -EINVAL; 587 } 588 589 if (bs->bl.max_transfer) { 590 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 591 } 592 593 lba = sector_qemu2lun(sector_num, iscsilun); 594 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 595 iscsi_co_init_iscsitask(iscsilun, &iTask); 596 qemu_mutex_lock(&iscsilun->mutex); 597 retry: 598 if (iscsilun->use_16_for_rw) { 599 #if LIBISCSI_API_VERSION >= (20160603) 600 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 601 NULL, num_sectors * iscsilun->block_size, 602 iscsilun->block_size, 0, 0, fua, 0, 0, 603 iscsi_co_generic_cb, &iTask, 604 (struct scsi_iovec *)iov->iov, iov->niov); 605 } else { 606 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 607 NULL, num_sectors * iscsilun->block_size, 608 iscsilun->block_size, 0, 0, fua, 0, 0, 609 iscsi_co_generic_cb, &iTask, 610 (struct scsi_iovec *)iov->iov, iov->niov); 611 } 612 #else 613 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 614 NULL, num_sectors * iscsilun->block_size, 615 iscsilun->block_size, 0, 0, fua, 0, 0, 616 iscsi_co_generic_cb, &iTask); 617 } else { 618 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 619 NULL, num_sectors * iscsilun->block_size, 620 iscsilun->block_size, 0, 0, fua, 0, 0, 621 iscsi_co_generic_cb, &iTask); 622 } 623 #endif 624 if (iTask.task == NULL) { 625 qemu_mutex_unlock(&iscsilun->mutex); 626 return -ENOMEM; 627 } 628 #if LIBISCSI_API_VERSION < (20160603) 629 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 630 iov->niov); 631 #endif 632 iscsi_co_wait_for_task(&iTask, iscsilun); 633 634 if (iTask.task != NULL) { 635 scsi_free_scsi_task(iTask.task); 636 iTask.task = NULL; 637 } 638 639 if (iTask.do_retry) { 640 iTask.complete = 0; 641 goto retry; 642 } 643 644 if (iTask.status != SCSI_STATUS_GOOD) { 645 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 646 nb_sectors * BDRV_SECTOR_SIZE); 647 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 648 iTask.err_str); 649 r = iTask.err_code; 650 goto out_unlock; 651 } 652 653 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 654 nb_sectors * BDRV_SECTOR_SIZE); 655 656 out_unlock: 657 qemu_mutex_unlock(&iscsilun->mutex); 658 g_free(iTask.err_str); 659 return r; 660 } 661 662 663 664 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 665 bool want_zero, int64_t offset, 666 int64_t bytes, int64_t *pnum, 667 int64_t *map, 668 BlockDriverState **file) 669 { 670 IscsiLun *iscsilun = bs->opaque; 671 struct scsi_get_lba_status *lbas = NULL; 672 struct scsi_lba_status_descriptor *lbasd = NULL; 673 struct IscsiTask iTask; 674 uint64_t lba; 675 int ret; 676 677 iscsi_co_init_iscsitask(iscsilun, &iTask); 678 679 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 680 681 /* default to all sectors allocated */ 682 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 683 if (map) { 684 *map = offset; 685 } 686 *pnum = bytes; 687 688 /* LUN does not support logical block provisioning */ 689 if (!iscsilun->lbpme) { 690 goto out; 691 } 692 693 lba = offset / iscsilun->block_size; 694 695 qemu_mutex_lock(&iscsilun->mutex); 696 retry: 697 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 698 lba, 8 + 16, iscsi_co_generic_cb, 699 &iTask) == NULL) { 700 ret = -ENOMEM; 701 goto out_unlock; 702 } 703 iscsi_co_wait_for_task(&iTask, iscsilun); 704 705 if (iTask.do_retry) { 706 if (iTask.task != NULL) { 707 scsi_free_scsi_task(iTask.task); 708 iTask.task = NULL; 709 } 710 iTask.complete = 0; 711 goto retry; 712 } 713 714 if (iTask.status != SCSI_STATUS_GOOD) { 715 /* in case the get_lba_status_callout fails (i.e. 716 * because the device is busy or the cmd is not 717 * supported) we pretend all blocks are allocated 718 * for backwards compatibility */ 719 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 720 lba, iTask.err_str); 721 goto out_unlock; 722 } 723 724 lbas = scsi_datain_unmarshall(iTask.task); 725 if (lbas == NULL) { 726 ret = -EIO; 727 goto out_unlock; 728 } 729 730 lbasd = &lbas->descriptors[0]; 731 732 if (lba != lbasd->lba) { 733 ret = -EIO; 734 goto out_unlock; 735 } 736 737 *pnum = lbasd->num_blocks * iscsilun->block_size; 738 739 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 740 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 741 ret &= ~BDRV_BLOCK_DATA; 742 if (iscsilun->lbprz) { 743 ret |= BDRV_BLOCK_ZERO; 744 } 745 } 746 747 if (ret & BDRV_BLOCK_ZERO) { 748 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 749 } else { 750 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 751 } 752 753 if (*pnum > bytes) { 754 *pnum = bytes; 755 } 756 out_unlock: 757 qemu_mutex_unlock(&iscsilun->mutex); 758 g_free(iTask.err_str); 759 out: 760 if (iTask.task != NULL) { 761 scsi_free_scsi_task(iTask.task); 762 } 763 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 764 *file = bs; 765 } 766 return ret; 767 } 768 769 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 770 int64_t sector_num, int nb_sectors, 771 QEMUIOVector *iov) 772 { 773 IscsiLun *iscsilun = bs->opaque; 774 struct IscsiTask iTask; 775 uint64_t lba; 776 uint32_t num_sectors; 777 int r = 0; 778 779 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 780 return -EINVAL; 781 } 782 783 if (bs->bl.max_transfer) { 784 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 785 } 786 787 /* if cache.direct is off and we have a valid entry in our allocation map 788 * we can skip checking the block status and directly return zeroes if 789 * the request falls within an unallocated area */ 790 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 791 nb_sectors * BDRV_SECTOR_SIZE) && 792 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 793 nb_sectors * BDRV_SECTOR_SIZE)) { 794 qemu_iovec_memset(iov, 0, 0x00, iov->size); 795 return 0; 796 } 797 798 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 799 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 800 nb_sectors * BDRV_SECTOR_SIZE) && 801 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 802 nb_sectors * BDRV_SECTOR_SIZE)) { 803 int64_t pnum; 804 /* check the block status from the beginning of the cluster 805 * containing the start sector */ 806 int64_t head; 807 int ret; 808 809 assert(iscsilun->cluster_size); 810 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 811 ret = iscsi_co_block_status(bs, true, 812 sector_num * BDRV_SECTOR_SIZE - head, 813 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 814 if (ret < 0) { 815 return ret; 816 } 817 /* if the whole request falls into an unallocated area we can avoid 818 * reading and directly return zeroes instead */ 819 if (ret & BDRV_BLOCK_ZERO && 820 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 821 qemu_iovec_memset(iov, 0, 0x00, iov->size); 822 return 0; 823 } 824 } 825 826 lba = sector_qemu2lun(sector_num, iscsilun); 827 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 828 829 iscsi_co_init_iscsitask(iscsilun, &iTask); 830 qemu_mutex_lock(&iscsilun->mutex); 831 retry: 832 if (iscsilun->use_16_for_rw) { 833 #if LIBISCSI_API_VERSION >= (20160603) 834 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 835 num_sectors * iscsilun->block_size, 836 iscsilun->block_size, 0, 0, 0, 0, 0, 837 iscsi_co_generic_cb, &iTask, 838 (struct scsi_iovec *)iov->iov, iov->niov); 839 } else { 840 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 841 num_sectors * iscsilun->block_size, 842 iscsilun->block_size, 843 0, 0, 0, 0, 0, 844 iscsi_co_generic_cb, &iTask, 845 (struct scsi_iovec *)iov->iov, iov->niov); 846 } 847 #else 848 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 849 num_sectors * iscsilun->block_size, 850 iscsilun->block_size, 0, 0, 0, 0, 0, 851 iscsi_co_generic_cb, &iTask); 852 } else { 853 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 854 num_sectors * iscsilun->block_size, 855 iscsilun->block_size, 856 0, 0, 0, 0, 0, 857 iscsi_co_generic_cb, &iTask); 858 } 859 #endif 860 if (iTask.task == NULL) { 861 qemu_mutex_unlock(&iscsilun->mutex); 862 return -ENOMEM; 863 } 864 #if LIBISCSI_API_VERSION < (20160603) 865 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 866 #endif 867 868 iscsi_co_wait_for_task(&iTask, iscsilun); 869 if (iTask.task != NULL) { 870 scsi_free_scsi_task(iTask.task); 871 iTask.task = NULL; 872 } 873 874 if (iTask.do_retry) { 875 iTask.complete = 0; 876 goto retry; 877 } 878 879 if (iTask.status != SCSI_STATUS_GOOD) { 880 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 881 lba, iTask.err_str); 882 r = iTask.err_code; 883 } 884 885 qemu_mutex_unlock(&iscsilun->mutex); 886 g_free(iTask.err_str); 887 return r; 888 } 889 890 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 891 { 892 IscsiLun *iscsilun = bs->opaque; 893 struct IscsiTask iTask; 894 int r = 0; 895 896 iscsi_co_init_iscsitask(iscsilun, &iTask); 897 qemu_mutex_lock(&iscsilun->mutex); 898 retry: 899 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 900 0, iscsi_co_generic_cb, &iTask) == NULL) { 901 qemu_mutex_unlock(&iscsilun->mutex); 902 return -ENOMEM; 903 } 904 905 iscsi_co_wait_for_task(&iTask, iscsilun); 906 907 if (iTask.task != NULL) { 908 scsi_free_scsi_task(iTask.task); 909 iTask.task = NULL; 910 } 911 912 if (iTask.do_retry) { 913 iTask.complete = 0; 914 goto retry; 915 } 916 917 if (iTask.status != SCSI_STATUS_GOOD) { 918 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 919 r = iTask.err_code; 920 } 921 922 qemu_mutex_unlock(&iscsilun->mutex); 923 g_free(iTask.err_str); 924 return r; 925 } 926 927 #ifdef __linux__ 928 /* Called (via iscsi_service) with QemuMutex held. */ 929 static void 930 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 931 void *command_data, void *opaque) 932 { 933 IscsiAIOCB *acb = opaque; 934 935 g_free(acb->buf); 936 acb->buf = NULL; 937 938 acb->status = 0; 939 if (status < 0) { 940 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 941 iscsi_get_error(iscsi)); 942 acb->status = iscsi_translate_sense(&acb->task->sense); 943 } 944 945 acb->ioh->driver_status = 0; 946 acb->ioh->host_status = 0; 947 acb->ioh->resid = 0; 948 acb->ioh->status = status; 949 950 #define SG_ERR_DRIVER_SENSE 0x08 951 952 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 953 int ss; 954 955 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 956 957 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 958 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 959 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 960 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 961 } 962 963 iscsi_schedule_bh(acb); 964 } 965 966 static void iscsi_ioctl_bh_completion(void *opaque) 967 { 968 IscsiAIOCB *acb = opaque; 969 970 qemu_bh_delete(acb->bh); 971 acb->common.cb(acb->common.opaque, acb->ret); 972 qemu_aio_unref(acb); 973 } 974 975 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 976 { 977 BlockDriverState *bs = acb->common.bs; 978 IscsiLun *iscsilun = bs->opaque; 979 int ret = 0; 980 981 switch (req) { 982 case SG_GET_VERSION_NUM: 983 *(int *)buf = 30000; 984 break; 985 case SG_GET_SCSI_ID: 986 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 987 break; 988 default: 989 ret = -EINVAL; 990 } 991 assert(!acb->bh); 992 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 993 iscsi_ioctl_bh_completion, acb); 994 acb->ret = ret; 995 qemu_bh_schedule(acb->bh); 996 } 997 998 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 999 unsigned long int req, void *buf, 1000 BlockCompletionFunc *cb, void *opaque) 1001 { 1002 IscsiLun *iscsilun = bs->opaque; 1003 struct iscsi_context *iscsi = iscsilun->iscsi; 1004 struct iscsi_data data; 1005 IscsiAIOCB *acb; 1006 1007 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1008 1009 acb->iscsilun = iscsilun; 1010 acb->bh = NULL; 1011 acb->status = -EINPROGRESS; 1012 acb->buf = NULL; 1013 acb->ioh = buf; 1014 1015 if (req != SG_IO) { 1016 iscsi_ioctl_handle_emulated(acb, req, buf); 1017 return &acb->common; 1018 } 1019 1020 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1021 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1022 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1023 qemu_aio_unref(acb); 1024 return NULL; 1025 } 1026 1027 acb->task = malloc(sizeof(struct scsi_task)); 1028 if (acb->task == NULL) { 1029 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1030 iscsi_get_error(iscsi)); 1031 qemu_aio_unref(acb); 1032 return NULL; 1033 } 1034 memset(acb->task, 0, sizeof(struct scsi_task)); 1035 1036 switch (acb->ioh->dxfer_direction) { 1037 case SG_DXFER_TO_DEV: 1038 acb->task->xfer_dir = SCSI_XFER_WRITE; 1039 break; 1040 case SG_DXFER_FROM_DEV: 1041 acb->task->xfer_dir = SCSI_XFER_READ; 1042 break; 1043 default: 1044 acb->task->xfer_dir = SCSI_XFER_NONE; 1045 break; 1046 } 1047 1048 acb->task->cdb_size = acb->ioh->cmd_len; 1049 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1050 acb->task->expxferlen = acb->ioh->dxfer_len; 1051 1052 data.size = 0; 1053 qemu_mutex_lock(&iscsilun->mutex); 1054 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1055 if (acb->ioh->iovec_count == 0) { 1056 data.data = acb->ioh->dxferp; 1057 data.size = acb->ioh->dxfer_len; 1058 } else { 1059 scsi_task_set_iov_out(acb->task, 1060 (struct scsi_iovec *) acb->ioh->dxferp, 1061 acb->ioh->iovec_count); 1062 } 1063 } 1064 1065 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1066 iscsi_aio_ioctl_cb, 1067 (data.size > 0) ? &data : NULL, 1068 acb) != 0) { 1069 qemu_mutex_unlock(&iscsilun->mutex); 1070 scsi_free_scsi_task(acb->task); 1071 qemu_aio_unref(acb); 1072 return NULL; 1073 } 1074 1075 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1076 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1077 if (acb->ioh->iovec_count == 0) { 1078 scsi_task_add_data_in_buffer(acb->task, 1079 acb->ioh->dxfer_len, 1080 acb->ioh->dxferp); 1081 } else { 1082 scsi_task_set_iov_in(acb->task, 1083 (struct scsi_iovec *) acb->ioh->dxferp, 1084 acb->ioh->iovec_count); 1085 } 1086 } 1087 1088 iscsi_set_events(iscsilun); 1089 qemu_mutex_unlock(&iscsilun->mutex); 1090 1091 return &acb->common; 1092 } 1093 1094 #endif 1095 1096 static int64_t 1097 iscsi_getlength(BlockDriverState *bs) 1098 { 1099 IscsiLun *iscsilun = bs->opaque; 1100 int64_t len; 1101 1102 len = iscsilun->num_blocks; 1103 len *= iscsilun->block_size; 1104 1105 return len; 1106 } 1107 1108 static int 1109 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1110 { 1111 IscsiLun *iscsilun = bs->opaque; 1112 struct IscsiTask iTask; 1113 struct unmap_list list; 1114 int r = 0; 1115 1116 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1117 return -ENOTSUP; 1118 } 1119 1120 if (!iscsilun->lbp.lbpu) { 1121 /* UNMAP is not supported by the target */ 1122 return 0; 1123 } 1124 1125 list.lba = offset / iscsilun->block_size; 1126 list.num = bytes / iscsilun->block_size; 1127 1128 iscsi_co_init_iscsitask(iscsilun, &iTask); 1129 qemu_mutex_lock(&iscsilun->mutex); 1130 retry: 1131 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1132 iscsi_co_generic_cb, &iTask) == NULL) { 1133 r = -ENOMEM; 1134 goto out_unlock; 1135 } 1136 1137 iscsi_co_wait_for_task(&iTask, iscsilun); 1138 1139 if (iTask.task != NULL) { 1140 scsi_free_scsi_task(iTask.task); 1141 iTask.task = NULL; 1142 } 1143 1144 if (iTask.do_retry) { 1145 iTask.complete = 0; 1146 goto retry; 1147 } 1148 1149 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1150 1151 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1152 /* the target might fail with a check condition if it 1153 is not happy with the alignment of the UNMAP request 1154 we silently fail in this case */ 1155 goto out_unlock; 1156 } 1157 1158 if (iTask.status != SCSI_STATUS_GOOD) { 1159 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1160 list.lba, iTask.err_str); 1161 r = iTask.err_code; 1162 goto out_unlock; 1163 } 1164 1165 out_unlock: 1166 qemu_mutex_unlock(&iscsilun->mutex); 1167 g_free(iTask.err_str); 1168 return r; 1169 } 1170 1171 static int 1172 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1173 int bytes, BdrvRequestFlags flags) 1174 { 1175 IscsiLun *iscsilun = bs->opaque; 1176 struct IscsiTask iTask; 1177 uint64_t lba; 1178 uint32_t nb_blocks; 1179 bool use_16_for_ws = iscsilun->use_16_for_rw; 1180 int r = 0; 1181 1182 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1183 return -ENOTSUP; 1184 } 1185 1186 if (flags & BDRV_REQ_MAY_UNMAP) { 1187 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1188 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1189 use_16_for_ws = true; 1190 } 1191 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1192 /* WRITESAME16 with UNMAP is not supported by the target, 1193 * fall back and try WRITESAME10/16 without UNMAP */ 1194 flags &= ~BDRV_REQ_MAY_UNMAP; 1195 use_16_for_ws = iscsilun->use_16_for_rw; 1196 } 1197 } 1198 1199 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1200 /* WRITESAME without UNMAP is not supported by the target */ 1201 return -ENOTSUP; 1202 } 1203 1204 lba = offset / iscsilun->block_size; 1205 nb_blocks = bytes / iscsilun->block_size; 1206 1207 if (iscsilun->zeroblock == NULL) { 1208 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1209 if (iscsilun->zeroblock == NULL) { 1210 return -ENOMEM; 1211 } 1212 } 1213 1214 qemu_mutex_lock(&iscsilun->mutex); 1215 iscsi_co_init_iscsitask(iscsilun, &iTask); 1216 retry: 1217 if (use_16_for_ws) { 1218 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1219 iscsilun->zeroblock, iscsilun->block_size, 1220 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1221 0, 0, iscsi_co_generic_cb, &iTask); 1222 } else { 1223 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1224 iscsilun->zeroblock, iscsilun->block_size, 1225 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1226 0, 0, iscsi_co_generic_cb, &iTask); 1227 } 1228 if (iTask.task == NULL) { 1229 qemu_mutex_unlock(&iscsilun->mutex); 1230 return -ENOMEM; 1231 } 1232 1233 iscsi_co_wait_for_task(&iTask, iscsilun); 1234 1235 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1236 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1237 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1238 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1239 /* WRITE SAME is not supported by the target */ 1240 iscsilun->has_write_same = false; 1241 scsi_free_scsi_task(iTask.task); 1242 r = -ENOTSUP; 1243 goto out_unlock; 1244 } 1245 1246 if (iTask.task != NULL) { 1247 scsi_free_scsi_task(iTask.task); 1248 iTask.task = NULL; 1249 } 1250 1251 if (iTask.do_retry) { 1252 iTask.complete = 0; 1253 goto retry; 1254 } 1255 1256 if (iTask.status != SCSI_STATUS_GOOD) { 1257 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1258 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1259 lba, iTask.err_str); 1260 r = iTask.err_code; 1261 goto out_unlock; 1262 } 1263 1264 if (flags & BDRV_REQ_MAY_UNMAP) { 1265 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1266 } else { 1267 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1268 } 1269 1270 out_unlock: 1271 qemu_mutex_unlock(&iscsilun->mutex); 1272 g_free(iTask.err_str); 1273 return r; 1274 } 1275 1276 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1277 Error **errp) 1278 { 1279 const char *user = NULL; 1280 const char *password = NULL; 1281 const char *secretid; 1282 char *secret = NULL; 1283 1284 user = qemu_opt_get(opts, "user"); 1285 if (!user) { 1286 return; 1287 } 1288 1289 secretid = qemu_opt_get(opts, "password-secret"); 1290 password = qemu_opt_get(opts, "password"); 1291 if (secretid && password) { 1292 error_setg(errp, "'password' and 'password-secret' properties are " 1293 "mutually exclusive"); 1294 return; 1295 } 1296 if (secretid) { 1297 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1298 if (!secret) { 1299 return; 1300 } 1301 password = secret; 1302 } else if (!password) { 1303 error_setg(errp, "CHAP username specified but no password was given"); 1304 return; 1305 } 1306 1307 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1308 error_setg(errp, "Failed to set initiator username and password"); 1309 } 1310 1311 g_free(secret); 1312 } 1313 1314 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1315 Error **errp) 1316 { 1317 const char *digest = NULL; 1318 1319 digest = qemu_opt_get(opts, "header-digest"); 1320 if (!digest) { 1321 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1322 } else if (!strcmp(digest, "crc32c")) { 1323 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1324 } else if (!strcmp(digest, "none")) { 1325 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1326 } else if (!strcmp(digest, "crc32c-none")) { 1327 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1328 } else if (!strcmp(digest, "none-crc32c")) { 1329 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1330 } else { 1331 error_setg(errp, "Invalid header-digest setting : %s", digest); 1332 } 1333 } 1334 1335 static char *get_initiator_name(QemuOpts *opts) 1336 { 1337 const char *name; 1338 char *iscsi_name; 1339 UuidInfo *uuid_info; 1340 1341 name = qemu_opt_get(opts, "initiator-name"); 1342 if (name) { 1343 return g_strdup(name); 1344 } 1345 1346 uuid_info = qmp_query_uuid(NULL); 1347 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1348 name = qemu_get_vm_name(); 1349 } else { 1350 name = uuid_info->UUID; 1351 } 1352 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1353 name ? ":" : "", name ? name : ""); 1354 qapi_free_UuidInfo(uuid_info); 1355 return iscsi_name; 1356 } 1357 1358 static void iscsi_nop_timed_event(void *opaque) 1359 { 1360 IscsiLun *iscsilun = opaque; 1361 1362 qemu_mutex_lock(&iscsilun->mutex); 1363 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1364 error_report("iSCSI: NOP timeout. Reconnecting..."); 1365 iscsilun->request_timed_out = true; 1366 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1367 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1368 goto out; 1369 } 1370 1371 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1372 iscsi_set_events(iscsilun); 1373 1374 out: 1375 qemu_mutex_unlock(&iscsilun->mutex); 1376 } 1377 1378 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1379 { 1380 struct scsi_task *task = NULL; 1381 struct scsi_readcapacity10 *rc10 = NULL; 1382 struct scsi_readcapacity16 *rc16 = NULL; 1383 int retries = ISCSI_CMD_RETRIES; 1384 1385 do { 1386 if (task != NULL) { 1387 scsi_free_scsi_task(task); 1388 task = NULL; 1389 } 1390 1391 switch (iscsilun->type) { 1392 case TYPE_DISK: 1393 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1394 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1395 rc16 = scsi_datain_unmarshall(task); 1396 if (rc16 == NULL) { 1397 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1398 } else { 1399 iscsilun->block_size = rc16->block_length; 1400 iscsilun->num_blocks = rc16->returned_lba + 1; 1401 iscsilun->lbpme = !!rc16->lbpme; 1402 iscsilun->lbprz = !!rc16->lbprz; 1403 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1404 } 1405 break; 1406 } 1407 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1408 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1409 break; 1410 } 1411 /* Fall through and try READ CAPACITY(10) instead. */ 1412 case TYPE_ROM: 1413 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1414 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1415 rc10 = scsi_datain_unmarshall(task); 1416 if (rc10 == NULL) { 1417 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1418 } else { 1419 iscsilun->block_size = rc10->block_size; 1420 if (rc10->lba == 0) { 1421 /* blank disk loaded */ 1422 iscsilun->num_blocks = 0; 1423 } else { 1424 iscsilun->num_blocks = rc10->lba + 1; 1425 } 1426 } 1427 } 1428 break; 1429 default: 1430 return; 1431 } 1432 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1433 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1434 && retries-- > 0); 1435 1436 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1437 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1438 } else if (!iscsilun->block_size || 1439 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1440 error_setg(errp, "iSCSI: the target returned an invalid " 1441 "block size of %d.", iscsilun->block_size); 1442 } 1443 if (task) { 1444 scsi_free_scsi_task(task); 1445 } 1446 } 1447 1448 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1449 int evpd, int pc, void **inq, Error **errp) 1450 { 1451 int full_size; 1452 struct scsi_task *task = NULL; 1453 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1454 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1455 goto fail; 1456 } 1457 full_size = scsi_datain_getfullsize(task); 1458 if (full_size > task->datain.size) { 1459 scsi_free_scsi_task(task); 1460 1461 /* we need more data for the full list */ 1462 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1463 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1464 goto fail; 1465 } 1466 } 1467 1468 *inq = scsi_datain_unmarshall(task); 1469 if (*inq == NULL) { 1470 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1471 goto fail_with_err; 1472 } 1473 1474 return task; 1475 1476 fail: 1477 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1478 iscsi_get_error(iscsi)); 1479 fail_with_err: 1480 if (task != NULL) { 1481 scsi_free_scsi_task(task); 1482 } 1483 return NULL; 1484 } 1485 1486 static void iscsi_detach_aio_context(BlockDriverState *bs) 1487 { 1488 IscsiLun *iscsilun = bs->opaque; 1489 1490 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1491 false, NULL, NULL, NULL, NULL); 1492 iscsilun->events = 0; 1493 1494 if (iscsilun->nop_timer) { 1495 timer_del(iscsilun->nop_timer); 1496 timer_free(iscsilun->nop_timer); 1497 iscsilun->nop_timer = NULL; 1498 } 1499 if (iscsilun->event_timer) { 1500 timer_del(iscsilun->event_timer); 1501 timer_free(iscsilun->event_timer); 1502 iscsilun->event_timer = NULL; 1503 } 1504 } 1505 1506 static void iscsi_attach_aio_context(BlockDriverState *bs, 1507 AioContext *new_context) 1508 { 1509 IscsiLun *iscsilun = bs->opaque; 1510 1511 iscsilun->aio_context = new_context; 1512 iscsi_set_events(iscsilun); 1513 1514 /* Set up a timer for sending out iSCSI NOPs */ 1515 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1516 QEMU_CLOCK_REALTIME, SCALE_MS, 1517 iscsi_nop_timed_event, iscsilun); 1518 timer_mod(iscsilun->nop_timer, 1519 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1520 1521 /* Set up a timer for periodic calls to iscsi_set_events and to 1522 * scan for command timeout */ 1523 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1524 QEMU_CLOCK_REALTIME, SCALE_MS, 1525 iscsi_timed_check_events, iscsilun); 1526 timer_mod(iscsilun->event_timer, 1527 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1528 } 1529 1530 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1531 { 1532 struct scsi_task *task; 1533 struct scsi_mode_sense *ms = NULL; 1534 iscsilun->write_protected = false; 1535 iscsilun->dpofua = false; 1536 1537 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1538 1, SCSI_MODESENSE_PC_CURRENT, 1539 0x3F, 0, 255); 1540 if (task == NULL) { 1541 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1542 iscsi_get_error(iscsilun->iscsi)); 1543 goto out; 1544 } 1545 1546 if (task->status != SCSI_STATUS_GOOD) { 1547 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1548 goto out; 1549 } 1550 ms = scsi_datain_unmarshall(task); 1551 if (!ms) { 1552 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1553 iscsi_get_error(iscsilun->iscsi)); 1554 goto out; 1555 } 1556 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1557 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1558 1559 out: 1560 if (task) { 1561 scsi_free_scsi_task(task); 1562 } 1563 } 1564 1565 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1566 { 1567 QemuOptsList *list; 1568 QemuOpts *opts; 1569 const char *user, *password, *password_secret, *initiator_name, 1570 *header_digest, *timeout; 1571 1572 list = qemu_find_opts("iscsi"); 1573 if (!list) { 1574 return; 1575 } 1576 1577 opts = qemu_opts_find(list, target); 1578 if (opts == NULL) { 1579 opts = QTAILQ_FIRST(&list->head); 1580 if (!opts) { 1581 return; 1582 } 1583 } 1584 1585 user = qemu_opt_get(opts, "user"); 1586 if (user) { 1587 qdict_set_default_str(options, "user", user); 1588 } 1589 1590 password = qemu_opt_get(opts, "password"); 1591 if (password) { 1592 qdict_set_default_str(options, "password", password); 1593 } 1594 1595 password_secret = qemu_opt_get(opts, "password-secret"); 1596 if (password_secret) { 1597 qdict_set_default_str(options, "password-secret", password_secret); 1598 } 1599 1600 initiator_name = qemu_opt_get(opts, "initiator-name"); 1601 if (initiator_name) { 1602 qdict_set_default_str(options, "initiator-name", initiator_name); 1603 } 1604 1605 header_digest = qemu_opt_get(opts, "header-digest"); 1606 if (header_digest) { 1607 /* -iscsi takes upper case values, but QAPI only supports lower case 1608 * enum constant names, so we have to convert here. */ 1609 char *qapi_value = g_ascii_strdown(header_digest, -1); 1610 qdict_set_default_str(options, "header-digest", qapi_value); 1611 g_free(qapi_value); 1612 } 1613 1614 timeout = qemu_opt_get(opts, "timeout"); 1615 if (timeout) { 1616 qdict_set_default_str(options, "timeout", timeout); 1617 } 1618 } 1619 1620 /* 1621 * We support iscsi url's on the form 1622 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1623 */ 1624 static void iscsi_parse_filename(const char *filename, QDict *options, 1625 Error **errp) 1626 { 1627 struct iscsi_url *iscsi_url; 1628 const char *transport_name; 1629 char *lun_str; 1630 1631 iscsi_url = iscsi_parse_full_url(NULL, filename); 1632 if (iscsi_url == NULL) { 1633 error_setg(errp, "Failed to parse URL : %s", filename); 1634 return; 1635 } 1636 1637 #if LIBISCSI_API_VERSION >= (20160603) 1638 switch (iscsi_url->transport) { 1639 case TCP_TRANSPORT: 1640 transport_name = "tcp"; 1641 break; 1642 case ISER_TRANSPORT: 1643 transport_name = "iser"; 1644 break; 1645 default: 1646 error_setg(errp, "Unknown transport type (%d)", 1647 iscsi_url->transport); 1648 return; 1649 } 1650 #else 1651 transport_name = "tcp"; 1652 #endif 1653 1654 qdict_set_default_str(options, "transport", transport_name); 1655 qdict_set_default_str(options, "portal", iscsi_url->portal); 1656 qdict_set_default_str(options, "target", iscsi_url->target); 1657 1658 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1659 qdict_set_default_str(options, "lun", lun_str); 1660 g_free(lun_str); 1661 1662 /* User/password from -iscsi take precedence over those from the URL */ 1663 iscsi_parse_iscsi_option(iscsi_url->target, options); 1664 1665 if (iscsi_url->user[0] != '\0') { 1666 qdict_set_default_str(options, "user", iscsi_url->user); 1667 qdict_set_default_str(options, "password", iscsi_url->passwd); 1668 } 1669 1670 iscsi_destroy_url(iscsi_url); 1671 } 1672 1673 static QemuOptsList runtime_opts = { 1674 .name = "iscsi", 1675 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1676 .desc = { 1677 { 1678 .name = "transport", 1679 .type = QEMU_OPT_STRING, 1680 }, 1681 { 1682 .name = "portal", 1683 .type = QEMU_OPT_STRING, 1684 }, 1685 { 1686 .name = "target", 1687 .type = QEMU_OPT_STRING, 1688 }, 1689 { 1690 .name = "user", 1691 .type = QEMU_OPT_STRING, 1692 }, 1693 { 1694 .name = "password", 1695 .type = QEMU_OPT_STRING, 1696 }, 1697 { 1698 .name = "password-secret", 1699 .type = QEMU_OPT_STRING, 1700 }, 1701 { 1702 .name = "lun", 1703 .type = QEMU_OPT_NUMBER, 1704 }, 1705 { 1706 .name = "initiator-name", 1707 .type = QEMU_OPT_STRING, 1708 }, 1709 { 1710 .name = "header-digest", 1711 .type = QEMU_OPT_STRING, 1712 }, 1713 { 1714 .name = "timeout", 1715 .type = QEMU_OPT_NUMBER, 1716 }, 1717 { /* end of list */ } 1718 }, 1719 }; 1720 1721 static void iscsi_save_designator(IscsiLun *lun, 1722 struct scsi_inquiry_device_identification *inq_di) 1723 { 1724 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1725 1726 for (desig = inq_di->designators; desig; desig = desig->next) { 1727 if (desig->association || 1728 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1729 continue; 1730 } 1731 /* NAA works better than T10 vendor ID based designator. */ 1732 if (!copy || copy->designator_type < desig->designator_type) { 1733 copy = desig; 1734 } 1735 } 1736 if (copy) { 1737 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1738 *lun->dd = *copy; 1739 lun->dd->next = NULL; 1740 lun->dd->designator = g_malloc(copy->designator_length); 1741 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1742 } 1743 } 1744 1745 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1746 Error **errp) 1747 { 1748 IscsiLun *iscsilun = bs->opaque; 1749 struct iscsi_context *iscsi = NULL; 1750 struct scsi_task *task = NULL; 1751 struct scsi_inquiry_standard *inq = NULL; 1752 struct scsi_inquiry_supported_pages *inq_vpd; 1753 char *initiator_name = NULL; 1754 QemuOpts *opts; 1755 Error *local_err = NULL; 1756 const char *transport_name, *portal, *target; 1757 #if LIBISCSI_API_VERSION >= (20160603) 1758 enum iscsi_transport_type transport; 1759 #endif 1760 int i, ret = 0, timeout = 0, lun; 1761 1762 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1763 qemu_opts_absorb_qdict(opts, options, &local_err); 1764 if (local_err) { 1765 error_propagate(errp, local_err); 1766 ret = -EINVAL; 1767 goto out; 1768 } 1769 1770 transport_name = qemu_opt_get(opts, "transport"); 1771 portal = qemu_opt_get(opts, "portal"); 1772 target = qemu_opt_get(opts, "target"); 1773 lun = qemu_opt_get_number(opts, "lun", 0); 1774 1775 if (!transport_name || !portal || !target) { 1776 error_setg(errp, "Need all of transport, portal and target options"); 1777 ret = -EINVAL; 1778 goto out; 1779 } 1780 1781 if (!strcmp(transport_name, "tcp")) { 1782 #if LIBISCSI_API_VERSION >= (20160603) 1783 transport = TCP_TRANSPORT; 1784 } else if (!strcmp(transport_name, "iser")) { 1785 transport = ISER_TRANSPORT; 1786 #else 1787 /* TCP is what older libiscsi versions always use */ 1788 #endif 1789 } else { 1790 error_setg(errp, "Unknown transport: %s", transport_name); 1791 ret = -EINVAL; 1792 goto out; 1793 } 1794 1795 memset(iscsilun, 0, sizeof(IscsiLun)); 1796 1797 initiator_name = get_initiator_name(opts); 1798 1799 iscsi = iscsi_create_context(initiator_name); 1800 if (iscsi == NULL) { 1801 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1802 ret = -ENOMEM; 1803 goto out; 1804 } 1805 #if LIBISCSI_API_VERSION >= (20160603) 1806 if (iscsi_init_transport(iscsi, transport)) { 1807 error_setg(errp, ("Error initializing transport.")); 1808 ret = -EINVAL; 1809 goto out; 1810 } 1811 #endif 1812 if (iscsi_set_targetname(iscsi, target)) { 1813 error_setg(errp, "iSCSI: Failed to set target name."); 1814 ret = -EINVAL; 1815 goto out; 1816 } 1817 1818 /* check if we got CHAP username/password via the options */ 1819 apply_chap(iscsi, opts, &local_err); 1820 if (local_err != NULL) { 1821 error_propagate(errp, local_err); 1822 ret = -EINVAL; 1823 goto out; 1824 } 1825 1826 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1827 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1828 ret = -EINVAL; 1829 goto out; 1830 } 1831 1832 /* check if we got HEADER_DIGEST via the options */ 1833 apply_header_digest(iscsi, opts, &local_err); 1834 if (local_err != NULL) { 1835 error_propagate(errp, local_err); 1836 ret = -EINVAL; 1837 goto out; 1838 } 1839 1840 /* timeout handling is broken in libiscsi before 1.15.0 */ 1841 timeout = qemu_opt_get_number(opts, "timeout", 0); 1842 #if LIBISCSI_API_VERSION >= 20150621 1843 iscsi_set_timeout(iscsi, timeout); 1844 #else 1845 if (timeout) { 1846 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1847 } 1848 #endif 1849 1850 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1851 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1852 iscsi_get_error(iscsi)); 1853 ret = -EINVAL; 1854 goto out; 1855 } 1856 1857 iscsilun->iscsi = iscsi; 1858 iscsilun->aio_context = bdrv_get_aio_context(bs); 1859 iscsilun->lun = lun; 1860 iscsilun->has_write_same = true; 1861 1862 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1863 (void **) &inq, errp); 1864 if (task == NULL) { 1865 ret = -EINVAL; 1866 goto out; 1867 } 1868 iscsilun->type = inq->periperal_device_type; 1869 scsi_free_scsi_task(task); 1870 task = NULL; 1871 1872 iscsi_modesense_sync(iscsilun); 1873 if (iscsilun->dpofua) { 1874 bs->supported_write_flags = BDRV_REQ_FUA; 1875 } 1876 1877 /* Check the write protect flag of the LUN if we want to write */ 1878 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1879 iscsilun->write_protected) { 1880 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1881 ret = -EACCES; 1882 goto out; 1883 } 1884 1885 iscsi_readcapacity_sync(iscsilun, &local_err); 1886 if (local_err != NULL) { 1887 error_propagate(errp, local_err); 1888 ret = -EINVAL; 1889 goto out; 1890 } 1891 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1892 1893 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1894 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1895 * will try to read from the device to guess the image format. 1896 */ 1897 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1898 bs->sg = true; 1899 } 1900 1901 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1902 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1903 (void **) &inq_vpd, errp); 1904 if (task == NULL) { 1905 ret = -EINVAL; 1906 goto out; 1907 } 1908 for (i = 0; i < inq_vpd->num_pages; i++) { 1909 struct scsi_task *inq_task; 1910 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1911 struct scsi_inquiry_block_limits *inq_bl; 1912 struct scsi_inquiry_device_identification *inq_di; 1913 switch (inq_vpd->pages[i]) { 1914 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1915 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1916 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1917 (void **) &inq_lbp, errp); 1918 if (inq_task == NULL) { 1919 ret = -EINVAL; 1920 goto out; 1921 } 1922 memcpy(&iscsilun->lbp, inq_lbp, 1923 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1924 scsi_free_scsi_task(inq_task); 1925 break; 1926 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1927 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1928 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1929 (void **) &inq_bl, errp); 1930 if (inq_task == NULL) { 1931 ret = -EINVAL; 1932 goto out; 1933 } 1934 memcpy(&iscsilun->bl, inq_bl, 1935 sizeof(struct scsi_inquiry_block_limits)); 1936 scsi_free_scsi_task(inq_task); 1937 break; 1938 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1939 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1940 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1941 (void **) &inq_di, errp); 1942 if (inq_task == NULL) { 1943 ret = -EINVAL; 1944 goto out; 1945 } 1946 iscsi_save_designator(iscsilun, inq_di); 1947 scsi_free_scsi_task(inq_task); 1948 break; 1949 default: 1950 break; 1951 } 1952 } 1953 scsi_free_scsi_task(task); 1954 task = NULL; 1955 1956 qemu_mutex_init(&iscsilun->mutex); 1957 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1958 1959 /* Guess the internal cluster (page) size of the iscsi target by the means 1960 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1961 * reasonable size */ 1962 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1963 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1964 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 1965 iscsilun->block_size; 1966 if (iscsilun->lbprz) { 1967 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1968 } 1969 } 1970 1971 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 1972 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1973 } 1974 1975 out: 1976 qemu_opts_del(opts); 1977 g_free(initiator_name); 1978 if (task != NULL) { 1979 scsi_free_scsi_task(task); 1980 } 1981 1982 if (ret) { 1983 if (iscsi != NULL) { 1984 if (iscsi_is_logged_in(iscsi)) { 1985 iscsi_logout_sync(iscsi); 1986 } 1987 iscsi_destroy_context(iscsi); 1988 } 1989 memset(iscsilun, 0, sizeof(IscsiLun)); 1990 } 1991 1992 return ret; 1993 } 1994 1995 static void iscsi_close(BlockDriverState *bs) 1996 { 1997 IscsiLun *iscsilun = bs->opaque; 1998 struct iscsi_context *iscsi = iscsilun->iscsi; 1999 2000 iscsi_detach_aio_context(bs); 2001 if (iscsi_is_logged_in(iscsi)) { 2002 iscsi_logout_sync(iscsi); 2003 } 2004 iscsi_destroy_context(iscsi); 2005 if (iscsilun->dd) { 2006 g_free(iscsilun->dd->designator); 2007 g_free(iscsilun->dd); 2008 } 2009 g_free(iscsilun->zeroblock); 2010 iscsi_allocmap_free(iscsilun); 2011 qemu_mutex_destroy(&iscsilun->mutex); 2012 memset(iscsilun, 0, sizeof(IscsiLun)); 2013 } 2014 2015 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2016 { 2017 /* We don't actually refresh here, but just return data queried in 2018 * iscsi_open(): iscsi targets don't change their limits. */ 2019 2020 IscsiLun *iscsilun = bs->opaque; 2021 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2022 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2023 2024 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2025 2026 bs->bl.request_alignment = block_size; 2027 2028 if (iscsilun->bl.max_xfer_len) { 2029 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2030 } 2031 2032 if (max_xfer_len * block_size < INT_MAX) { 2033 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2034 } 2035 2036 if (iscsilun->lbp.lbpu) { 2037 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2038 bs->bl.max_pdiscard = 2039 iscsilun->bl.max_unmap * iscsilun->block_size; 2040 } 2041 bs->bl.pdiscard_alignment = 2042 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2043 } else { 2044 bs->bl.pdiscard_alignment = iscsilun->block_size; 2045 } 2046 2047 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2048 bs->bl.max_pwrite_zeroes = 2049 iscsilun->bl.max_ws_len * iscsilun->block_size; 2050 } 2051 if (iscsilun->lbp.lbpws) { 2052 bs->bl.pwrite_zeroes_alignment = 2053 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2054 } else { 2055 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2056 } 2057 if (iscsilun->bl.opt_xfer_len && 2058 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2059 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2060 iscsilun->block_size); 2061 } 2062 } 2063 2064 /* Note that this will not re-establish a connection with an iSCSI target - it 2065 * is effectively a NOP. */ 2066 static int iscsi_reopen_prepare(BDRVReopenState *state, 2067 BlockReopenQueue *queue, Error **errp) 2068 { 2069 IscsiLun *iscsilun = state->bs->opaque; 2070 2071 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2072 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2073 return -EACCES; 2074 } 2075 return 0; 2076 } 2077 2078 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2079 { 2080 IscsiLun *iscsilun = reopen_state->bs->opaque; 2081 2082 /* the cache.direct status might have changed */ 2083 if (iscsilun->allocmap != NULL) { 2084 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2085 } 2086 } 2087 2088 static int iscsi_truncate(BlockDriverState *bs, int64_t offset, 2089 PreallocMode prealloc, Error **errp) 2090 { 2091 IscsiLun *iscsilun = bs->opaque; 2092 Error *local_err = NULL; 2093 2094 if (prealloc != PREALLOC_MODE_OFF) { 2095 error_setg(errp, "Unsupported preallocation mode '%s'", 2096 PreallocMode_str(prealloc)); 2097 return -ENOTSUP; 2098 } 2099 2100 if (iscsilun->type != TYPE_DISK) { 2101 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2102 return -ENOTSUP; 2103 } 2104 2105 iscsi_readcapacity_sync(iscsilun, &local_err); 2106 if (local_err != NULL) { 2107 error_propagate(errp, local_err); 2108 return -EIO; 2109 } 2110 2111 if (offset > iscsi_getlength(bs)) { 2112 error_setg(errp, "Cannot grow iSCSI devices"); 2113 return -EINVAL; 2114 } 2115 2116 if (iscsilun->allocmap != NULL) { 2117 iscsi_allocmap_init(iscsilun, bs->open_flags); 2118 } 2119 2120 return 0; 2121 } 2122 2123 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2124 Error **errp) 2125 { 2126 int ret = 0; 2127 int64_t total_size = 0; 2128 BlockDriverState *bs; 2129 IscsiLun *iscsilun = NULL; 2130 QDict *bs_options; 2131 Error *local_err = NULL; 2132 2133 bs = bdrv_new(); 2134 2135 /* Read out options */ 2136 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2137 BDRV_SECTOR_SIZE); 2138 bs->opaque = g_new0(struct IscsiLun, 1); 2139 iscsilun = bs->opaque; 2140 2141 bs_options = qdict_new(); 2142 iscsi_parse_filename(filename, bs_options, &local_err); 2143 if (local_err) { 2144 error_propagate(errp, local_err); 2145 ret = -EINVAL; 2146 } else { 2147 ret = iscsi_open(bs, bs_options, 0, NULL); 2148 } 2149 qobject_unref(bs_options); 2150 2151 if (ret != 0) { 2152 goto out; 2153 } 2154 iscsi_detach_aio_context(bs); 2155 if (iscsilun->type != TYPE_DISK) { 2156 ret = -ENODEV; 2157 goto out; 2158 } 2159 if (bs->total_sectors < total_size) { 2160 ret = -ENOSPC; 2161 goto out; 2162 } 2163 2164 ret = 0; 2165 out: 2166 if (iscsilun->iscsi != NULL) { 2167 iscsi_destroy_context(iscsilun->iscsi); 2168 } 2169 g_free(bs->opaque); 2170 bs->opaque = NULL; 2171 bdrv_unref(bs); 2172 return ret; 2173 } 2174 2175 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2176 { 2177 IscsiLun *iscsilun = bs->opaque; 2178 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2179 bdi->cluster_size = iscsilun->cluster_size; 2180 return 0; 2181 } 2182 2183 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2184 Error **errp) 2185 { 2186 IscsiLun *iscsilun = bs->opaque; 2187 iscsi_allocmap_invalidate(iscsilun); 2188 } 2189 2190 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2191 BdrvChild *src, 2192 uint64_t src_offset, 2193 BdrvChild *dst, 2194 uint64_t dst_offset, 2195 uint64_t bytes, 2196 BdrvRequestFlags flags) 2197 { 2198 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, flags); 2199 } 2200 2201 static struct scsi_task *iscsi_xcopy_task(int param_len) 2202 { 2203 struct scsi_task *task; 2204 2205 task = g_new0(struct scsi_task, 1); 2206 2207 task->cdb[0] = EXTENDED_COPY; 2208 task->cdb[10] = (param_len >> 24) & 0xFF; 2209 task->cdb[11] = (param_len >> 16) & 0xFF; 2210 task->cdb[12] = (param_len >> 8) & 0xFF; 2211 task->cdb[13] = param_len & 0xFF; 2212 task->cdb_size = 16; 2213 task->xfer_dir = SCSI_XFER_WRITE; 2214 task->expxferlen = param_len; 2215 2216 return task; 2217 } 2218 2219 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2220 { 2221 struct scsi_inquiry_device_designator *dd = lun->dd; 2222 2223 memset(desc, 0, 32); 2224 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2225 desc[4] = dd->code_set; 2226 desc[5] = (dd->designator_type & 0xF) 2227 | ((dd->association & 3) << 4); 2228 desc[7] = dd->designator_length; 2229 memcpy(desc + 8, dd->designator, dd->designator_length); 2230 2231 desc[28] = 0; 2232 desc[29] = (lun->block_size >> 16) & 0xFF; 2233 desc[30] = (lun->block_size >> 8) & 0xFF; 2234 desc[31] = lun->block_size & 0xFF; 2235 } 2236 2237 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2238 int dst_index) 2239 { 2240 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2241 hdr[1] = ((dc << 1) | cat) & 0xFF; 2242 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2243 /* don't account for the first 4 bytes in descriptor header*/ 2244 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2245 hdr[4] = (src_index >> 8) & 0xFF; 2246 hdr[5] = src_index & 0xFF; 2247 hdr[6] = (dst_index >> 8) & 0xFF; 2248 hdr[7] = dst_index & 0xFF; 2249 } 2250 2251 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2252 int src_index, int dst_index, int num_blks, 2253 uint64_t src_lba, uint64_t dst_lba) 2254 { 2255 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2256 2257 /* The caller should verify the request size */ 2258 assert(num_blks < 65536); 2259 desc[10] = (num_blks >> 8) & 0xFF; 2260 desc[11] = num_blks & 0xFF; 2261 desc[12] = (src_lba >> 56) & 0xFF; 2262 desc[13] = (src_lba >> 48) & 0xFF; 2263 desc[14] = (src_lba >> 40) & 0xFF; 2264 desc[15] = (src_lba >> 32) & 0xFF; 2265 desc[16] = (src_lba >> 24) & 0xFF; 2266 desc[17] = (src_lba >> 16) & 0xFF; 2267 desc[18] = (src_lba >> 8) & 0xFF; 2268 desc[19] = src_lba & 0xFF; 2269 desc[20] = (dst_lba >> 56) & 0xFF; 2270 desc[21] = (dst_lba >> 48) & 0xFF; 2271 desc[22] = (dst_lba >> 40) & 0xFF; 2272 desc[23] = (dst_lba >> 32) & 0xFF; 2273 desc[24] = (dst_lba >> 24) & 0xFF; 2274 desc[25] = (dst_lba >> 16) & 0xFF; 2275 desc[26] = (dst_lba >> 8) & 0xFF; 2276 desc[27] = dst_lba & 0xFF; 2277 } 2278 2279 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2280 int list_id_usage, int prio, 2281 int tgt_desc_len, 2282 int seg_desc_len, int inline_data_len) 2283 { 2284 buf[0] = list_id; 2285 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2286 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2287 buf[3] = tgt_desc_len & 0xFF; 2288 buf[8] = (seg_desc_len >> 24) & 0xFF; 2289 buf[9] = (seg_desc_len >> 16) & 0xFF; 2290 buf[10] = (seg_desc_len >> 8) & 0xFF; 2291 buf[11] = seg_desc_len & 0xFF; 2292 buf[12] = (inline_data_len >> 24) & 0xFF; 2293 buf[13] = (inline_data_len >> 16) & 0xFF; 2294 buf[14] = (inline_data_len >> 8) & 0xFF; 2295 buf[15] = inline_data_len & 0xFF; 2296 } 2297 2298 static void iscsi_xcopy_data(struct iscsi_data *data, 2299 IscsiLun *src, int64_t src_lba, 2300 IscsiLun *dst, int64_t dst_lba, 2301 uint16_t num_blocks) 2302 { 2303 uint8_t *buf; 2304 const int src_offset = XCOPY_DESC_OFFSET; 2305 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2306 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2307 2308 data->size = XCOPY_DESC_OFFSET + 2309 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2310 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2311 data->data = g_malloc0(data->size); 2312 buf = data->data; 2313 2314 /* Initialise the parameter list header */ 2315 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2316 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2317 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2318 0); 2319 2320 /* Initialise CSCD list with one src + one dst descriptor */ 2321 iscsi_populate_target_desc(&buf[src_offset], src); 2322 iscsi_populate_target_desc(&buf[dst_offset], dst); 2323 2324 /* Initialise one segment descriptor */ 2325 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2326 src_lba, dst_lba); 2327 } 2328 2329 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2330 BdrvChild *src, 2331 uint64_t src_offset, 2332 BdrvChild *dst, 2333 uint64_t dst_offset, 2334 uint64_t bytes, 2335 BdrvRequestFlags flags) 2336 { 2337 IscsiLun *dst_lun = dst->bs->opaque; 2338 IscsiLun *src_lun; 2339 struct IscsiTask iscsi_task; 2340 struct iscsi_data data; 2341 int r = 0; 2342 int block_size; 2343 2344 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2345 return -ENOTSUP; 2346 } 2347 src_lun = src->bs->opaque; 2348 2349 if (!src_lun->dd || !dst_lun->dd) { 2350 return -ENOTSUP; 2351 } 2352 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2353 return -ENOTSUP; 2354 } 2355 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2356 return -ENOTSUP; 2357 } 2358 if (dst_lun->block_size != src_lun->block_size || 2359 !dst_lun->block_size) { 2360 return -ENOTSUP; 2361 } 2362 2363 block_size = dst_lun->block_size; 2364 if (bytes / block_size > 65535) { 2365 return -ENOTSUP; 2366 } 2367 2368 iscsi_xcopy_data(&data, 2369 src_lun, src_offset / block_size, 2370 dst_lun, dst_offset / block_size, 2371 bytes / block_size); 2372 2373 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2374 2375 qemu_mutex_lock(&dst_lun->mutex); 2376 iscsi_task.task = iscsi_xcopy_task(data.size); 2377 retry: 2378 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2379 iscsi_task.task, iscsi_co_generic_cb, 2380 &data, 2381 &iscsi_task) != 0) { 2382 r = -EIO; 2383 goto out_unlock; 2384 } 2385 2386 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2387 2388 if (iscsi_task.do_retry) { 2389 iscsi_task.complete = 0; 2390 goto retry; 2391 } 2392 2393 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2394 r = iscsi_task.err_code; 2395 goto out_unlock; 2396 } 2397 2398 out_unlock: 2399 g_free(iscsi_task.task); 2400 qemu_mutex_unlock(&dst_lun->mutex); 2401 g_free(iscsi_task.err_str); 2402 return r; 2403 } 2404 2405 static QemuOptsList iscsi_create_opts = { 2406 .name = "iscsi-create-opts", 2407 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2408 .desc = { 2409 { 2410 .name = BLOCK_OPT_SIZE, 2411 .type = QEMU_OPT_SIZE, 2412 .help = "Virtual disk size" 2413 }, 2414 { /* end of list */ } 2415 } 2416 }; 2417 2418 static BlockDriver bdrv_iscsi = { 2419 .format_name = "iscsi", 2420 .protocol_name = "iscsi", 2421 2422 .instance_size = sizeof(IscsiLun), 2423 .bdrv_parse_filename = iscsi_parse_filename, 2424 .bdrv_file_open = iscsi_open, 2425 .bdrv_close = iscsi_close, 2426 .bdrv_co_create_opts = iscsi_co_create_opts, 2427 .create_opts = &iscsi_create_opts, 2428 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2429 .bdrv_reopen_commit = iscsi_reopen_commit, 2430 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2431 2432 .bdrv_getlength = iscsi_getlength, 2433 .bdrv_get_info = iscsi_get_info, 2434 .bdrv_truncate = iscsi_truncate, 2435 .bdrv_refresh_limits = iscsi_refresh_limits, 2436 2437 .bdrv_co_block_status = iscsi_co_block_status, 2438 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2439 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2440 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2441 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2442 .bdrv_co_readv = iscsi_co_readv, 2443 .bdrv_co_writev = iscsi_co_writev, 2444 .bdrv_co_flush_to_disk = iscsi_co_flush, 2445 2446 #ifdef __linux__ 2447 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2448 #endif 2449 2450 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2451 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2452 }; 2453 2454 #if LIBISCSI_API_VERSION >= (20160603) 2455 static BlockDriver bdrv_iser = { 2456 .format_name = "iser", 2457 .protocol_name = "iser", 2458 2459 .instance_size = sizeof(IscsiLun), 2460 .bdrv_parse_filename = iscsi_parse_filename, 2461 .bdrv_file_open = iscsi_open, 2462 .bdrv_close = iscsi_close, 2463 .bdrv_co_create_opts = iscsi_co_create_opts, 2464 .create_opts = &iscsi_create_opts, 2465 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2466 .bdrv_reopen_commit = iscsi_reopen_commit, 2467 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2468 2469 .bdrv_getlength = iscsi_getlength, 2470 .bdrv_get_info = iscsi_get_info, 2471 .bdrv_truncate = iscsi_truncate, 2472 .bdrv_refresh_limits = iscsi_refresh_limits, 2473 2474 .bdrv_co_block_status = iscsi_co_block_status, 2475 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2476 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2477 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2478 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2479 .bdrv_co_readv = iscsi_co_readv, 2480 .bdrv_co_writev = iscsi_co_writev, 2481 .bdrv_co_flush_to_disk = iscsi_co_flush, 2482 2483 #ifdef __linux__ 2484 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2485 #endif 2486 2487 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2488 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2489 }; 2490 #endif 2491 2492 static void iscsi_block_init(void) 2493 { 2494 bdrv_register(&bdrv_iscsi); 2495 #if LIBISCSI_API_VERSION >= (20160603) 2496 bdrv_register(&bdrv_iser); 2497 #endif 2498 } 2499 2500 block_init(iscsi_block_init); 2501