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 #include "trace.h" 48 49 /* Conflict between scsi/utils.h and libiscsi! :( */ 50 #define SCSI_XFER_NONE ISCSI_XFER_NONE 51 #include <iscsi/iscsi.h> 52 #include <iscsi/scsi-lowlevel.h> 53 #undef SCSI_XFER_NONE 54 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 55 56 #ifdef __linux__ 57 #include <scsi/sg.h> 58 #endif 59 60 typedef struct IscsiLun { 61 struct iscsi_context *iscsi; 62 AioContext *aio_context; 63 int lun; 64 enum scsi_inquiry_peripheral_device_type type; 65 int block_size; 66 uint64_t num_blocks; 67 int events; 68 QEMUTimer *nop_timer; 69 QEMUTimer *event_timer; 70 QemuMutex mutex; 71 struct scsi_inquiry_logical_block_provisioning lbp; 72 struct scsi_inquiry_block_limits bl; 73 struct scsi_inquiry_device_designator *dd; 74 unsigned char *zeroblock; 75 /* The allocmap tracks which clusters (pages) on the iSCSI target are 76 * allocated and which are not. In case a target returns zeros for 77 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 78 * of reading zeros over the wire if a read request falls within an 79 * unallocated block. As there are 3 possible states we need 2 bitmaps to 80 * track. allocmap_valid keeps track if QEMU's information about a page is 81 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 82 * valid information about a page the corresponding allocmap entry should be 83 * switched to unallocated as well to force a new lookup of the allocation 84 * status as lookups are generally skipped if a page is suspect to be 85 * allocated. If a iSCSI target is opened with cache.direct = on the 86 * allocmap_valid does not exist turning all cached information invalid so 87 * that a fresh lookup is made for any page even if allocmap entry returns 88 * it's unallocated. */ 89 unsigned long *allocmap; 90 unsigned long *allocmap_valid; 91 long allocmap_size; 92 int cluster_size; 93 bool use_16_for_rw; 94 bool write_protected; 95 bool lbpme; 96 bool lbprz; 97 bool dpofua; 98 bool has_write_same; 99 bool request_timed_out; 100 } IscsiLun; 101 102 typedef struct IscsiTask { 103 int status; 104 int complete; 105 int retries; 106 int do_retry; 107 struct scsi_task *task; 108 Coroutine *co; 109 IscsiLun *iscsilun; 110 QEMUTimer retry_timer; 111 int err_code; 112 char *err_str; 113 } IscsiTask; 114 115 typedef struct IscsiAIOCB { 116 BlockAIOCB common; 117 QEMUBH *bh; 118 IscsiLun *iscsilun; 119 struct scsi_task *task; 120 uint8_t *buf; 121 int status; 122 int64_t sector_num; 123 int nb_sectors; 124 int ret; 125 #ifdef __linux__ 126 sg_io_hdr_t *ioh; 127 #endif 128 } IscsiAIOCB; 129 130 /* libiscsi uses time_t so its enough to process events every second */ 131 #define EVENT_INTERVAL 1000 132 #define NOP_INTERVAL 5000 133 #define MAX_NOP_FAILURES 3 134 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 135 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 136 137 /* this threshold is a trade-off knob to choose between 138 * the potential additional overhead of an extra GET_LBA_STATUS request 139 * vs. unnecessarily reading a lot of zero sectors over the wire. 140 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 141 * sectors we check the allocation status of the area covered by the 142 * request first if the allocationmap indicates that the area might be 143 * unallocated. */ 144 #define ISCSI_CHECKALLOC_THRES 64 145 146 static void 147 iscsi_bh_cb(void *p) 148 { 149 IscsiAIOCB *acb = p; 150 151 qemu_bh_delete(acb->bh); 152 153 g_free(acb->buf); 154 acb->buf = NULL; 155 156 acb->common.cb(acb->common.opaque, acb->status); 157 158 if (acb->task != NULL) { 159 scsi_free_scsi_task(acb->task); 160 acb->task = NULL; 161 } 162 163 qemu_aio_unref(acb); 164 } 165 166 static void 167 iscsi_schedule_bh(IscsiAIOCB *acb) 168 { 169 if (acb->bh) { 170 return; 171 } 172 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 173 qemu_bh_schedule(acb->bh); 174 } 175 176 static void iscsi_co_generic_bh_cb(void *opaque) 177 { 178 struct IscsiTask *iTask = opaque; 179 180 iTask->complete = 1; 181 aio_co_wake(iTask->co); 182 } 183 184 static void iscsi_retry_timer_expired(void *opaque) 185 { 186 struct IscsiTask *iTask = opaque; 187 iTask->complete = 1; 188 if (iTask->co) { 189 aio_co_wake(iTask->co); 190 } 191 } 192 193 static inline unsigned exp_random(double mean) 194 { 195 return -mean * log((double)rand() / RAND_MAX); 196 } 197 198 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 199 * libiscsi 1.10.0, together with other constants we need. Use it as 200 * a hint that we have to define them ourselves if needed, to keep the 201 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 202 * the test because SCSI_STATUS_* is an enum. 203 * 204 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 205 * an enum, check against the LIBISCSI_API_VERSION macro, which was 206 * introduced in 1.11.0. If it is present, there is no need to define 207 * anything. 208 */ 209 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 210 !defined(LIBISCSI_API_VERSION) 211 #define SCSI_STATUS_TASK_SET_FULL 0x28 212 #define SCSI_STATUS_TIMEOUT 0x0f000002 213 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 214 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 215 #endif 216 217 #ifndef LIBISCSI_API_VERSION 218 #define LIBISCSI_API_VERSION 20130701 219 #endif 220 221 static int iscsi_translate_sense(struct scsi_sense *sense) 222 { 223 return - scsi_sense_to_errno(sense->key, 224 (sense->ascq & 0xFF00) >> 8, 225 sense->ascq & 0xFF); 226 } 227 228 /* Called (via iscsi_service) with QemuMutex held. */ 229 static void 230 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 231 void *command_data, void *opaque) 232 { 233 struct IscsiTask *iTask = opaque; 234 struct scsi_task *task = command_data; 235 236 iTask->status = status; 237 iTask->do_retry = 0; 238 iTask->task = task; 239 240 if (status != SCSI_STATUS_GOOD) { 241 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 242 if (status == SCSI_STATUS_CHECK_CONDITION 243 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 244 error_report("iSCSI CheckCondition: %s", 245 iscsi_get_error(iscsi)); 246 iTask->do_retry = 1; 247 goto out; 248 } 249 if (status == SCSI_STATUS_BUSY || 250 status == SCSI_STATUS_TIMEOUT || 251 status == SCSI_STATUS_TASK_SET_FULL) { 252 unsigned retry_time = 253 exp_random(iscsi_retry_times[iTask->retries - 1]); 254 if (status == SCSI_STATUS_TIMEOUT) { 255 /* make sure the request is rescheduled AFTER the 256 * reconnect is initiated */ 257 retry_time = EVENT_INTERVAL * 2; 258 iTask->iscsilun->request_timed_out = true; 259 } 260 error_report("iSCSI Busy/TaskSetFull/TimeOut" 261 " (retry #%u in %u ms): %s", 262 iTask->retries, retry_time, 263 iscsi_get_error(iscsi)); 264 aio_timer_init(iTask->iscsilun->aio_context, 265 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 266 SCALE_MS, iscsi_retry_timer_expired, iTask); 267 timer_mod(&iTask->retry_timer, 268 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 269 iTask->do_retry = 1; 270 return; 271 } 272 } 273 iTask->err_code = iscsi_translate_sense(&task->sense); 274 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 275 } 276 277 out: 278 if (iTask->co) { 279 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 280 iscsi_co_generic_bh_cb, iTask); 281 } else { 282 iTask->complete = 1; 283 } 284 } 285 286 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 287 { 288 *iTask = (struct IscsiTask) { 289 .co = qemu_coroutine_self(), 290 .iscsilun = iscsilun, 291 }; 292 } 293 294 static void 295 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 296 void *private_data) 297 { 298 IscsiAIOCB *acb = private_data; 299 300 acb->status = -ECANCELED; 301 iscsi_schedule_bh(acb); 302 } 303 304 static void 305 iscsi_aio_cancel(BlockAIOCB *blockacb) 306 { 307 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 308 IscsiLun *iscsilun = acb->iscsilun; 309 310 if (acb->status != -EINPROGRESS) { 311 return; 312 } 313 314 /* send a task mgmt call to the target to cancel the task on the target */ 315 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 316 iscsi_abort_task_cb, acb); 317 318 } 319 320 static const AIOCBInfo iscsi_aiocb_info = { 321 .aiocb_size = sizeof(IscsiAIOCB), 322 .cancel_async = iscsi_aio_cancel, 323 }; 324 325 326 static void iscsi_process_read(void *arg); 327 static void iscsi_process_write(void *arg); 328 329 /* Called with QemuMutex held. */ 330 static void 331 iscsi_set_events(IscsiLun *iscsilun) 332 { 333 struct iscsi_context *iscsi = iscsilun->iscsi; 334 int ev = iscsi_which_events(iscsi); 335 336 if (ev != iscsilun->events) { 337 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 338 false, 339 (ev & POLLIN) ? iscsi_process_read : NULL, 340 (ev & POLLOUT) ? iscsi_process_write : NULL, 341 NULL, 342 iscsilun); 343 iscsilun->events = ev; 344 } 345 } 346 347 static void iscsi_timed_check_events(void *opaque) 348 { 349 IscsiLun *iscsilun = opaque; 350 351 /* check for timed out requests */ 352 iscsi_service(iscsilun->iscsi, 0); 353 354 if (iscsilun->request_timed_out) { 355 iscsilun->request_timed_out = false; 356 iscsi_reconnect(iscsilun->iscsi); 357 } 358 359 /* newer versions of libiscsi may return zero events. Ensure we are able 360 * to return to service once this situation changes. */ 361 iscsi_set_events(iscsilun); 362 363 timer_mod(iscsilun->event_timer, 364 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 365 } 366 367 static void 368 iscsi_process_read(void *arg) 369 { 370 IscsiLun *iscsilun = arg; 371 struct iscsi_context *iscsi = iscsilun->iscsi; 372 373 qemu_mutex_lock(&iscsilun->mutex); 374 iscsi_service(iscsi, POLLIN); 375 iscsi_set_events(iscsilun); 376 qemu_mutex_unlock(&iscsilun->mutex); 377 } 378 379 static void 380 iscsi_process_write(void *arg) 381 { 382 IscsiLun *iscsilun = arg; 383 struct iscsi_context *iscsi = iscsilun->iscsi; 384 385 qemu_mutex_lock(&iscsilun->mutex); 386 iscsi_service(iscsi, POLLOUT); 387 iscsi_set_events(iscsilun); 388 qemu_mutex_unlock(&iscsilun->mutex); 389 } 390 391 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 392 { 393 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 394 } 395 396 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 397 { 398 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 399 } 400 401 static bool is_byte_request_lun_aligned(int64_t offset, int count, 402 IscsiLun *iscsilun) 403 { 404 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 405 error_report("iSCSI misaligned request: " 406 "iscsilun->block_size %u, offset %" PRIi64 407 ", count %d", 408 iscsilun->block_size, offset, count); 409 return false; 410 } 411 return true; 412 } 413 414 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 415 IscsiLun *iscsilun) 416 { 417 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 418 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 419 nb_sectors << BDRV_SECTOR_BITS, 420 iscsilun); 421 } 422 423 static void iscsi_allocmap_free(IscsiLun *iscsilun) 424 { 425 g_free(iscsilun->allocmap); 426 g_free(iscsilun->allocmap_valid); 427 iscsilun->allocmap = NULL; 428 iscsilun->allocmap_valid = NULL; 429 } 430 431 432 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 433 { 434 iscsi_allocmap_free(iscsilun); 435 436 assert(iscsilun->cluster_size); 437 iscsilun->allocmap_size = 438 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 439 iscsilun->cluster_size); 440 441 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 442 if (!iscsilun->allocmap) { 443 return -ENOMEM; 444 } 445 446 if (open_flags & BDRV_O_NOCACHE) { 447 /* when cache.direct = on all allocmap entries are 448 * treated as invalid to force a relookup of the block 449 * status on every read request */ 450 return 0; 451 } 452 453 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 454 if (!iscsilun->allocmap_valid) { 455 /* if we are under memory pressure free the allocmap as well */ 456 iscsi_allocmap_free(iscsilun); 457 return -ENOMEM; 458 } 459 460 return 0; 461 } 462 463 static void 464 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 465 int64_t bytes, bool allocated, bool valid) 466 { 467 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 468 469 if (iscsilun->allocmap == NULL) { 470 return; 471 } 472 /* expand to entirely contain all affected clusters */ 473 assert(iscsilun->cluster_size); 474 cl_num_expanded = offset / iscsilun->cluster_size; 475 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 476 iscsilun->cluster_size) - cl_num_expanded; 477 /* shrink to touch only completely contained clusters */ 478 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 479 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 480 if (allocated) { 481 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 482 } else { 483 if (nb_cls_shrunk > 0) { 484 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 485 } 486 } 487 488 if (iscsilun->allocmap_valid == NULL) { 489 return; 490 } 491 if (valid) { 492 if (nb_cls_shrunk > 0) { 493 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 494 } 495 } else { 496 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 497 nb_cls_expanded); 498 } 499 } 500 501 static void 502 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 503 int64_t bytes) 504 { 505 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 506 } 507 508 static void 509 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 510 int64_t bytes) 511 { 512 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 513 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 514 */ 515 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 516 } 517 518 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 519 int64_t bytes) 520 { 521 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 522 } 523 524 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 525 { 526 if (iscsilun->allocmap) { 527 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 528 } 529 if (iscsilun->allocmap_valid) { 530 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 531 } 532 } 533 534 static inline bool 535 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 536 int64_t bytes) 537 { 538 unsigned long size; 539 if (iscsilun->allocmap == NULL) { 540 return true; 541 } 542 assert(iscsilun->cluster_size); 543 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 544 return !(find_next_bit(iscsilun->allocmap, size, 545 offset / iscsilun->cluster_size) == size); 546 } 547 548 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 549 int64_t offset, int64_t bytes) 550 { 551 unsigned long size; 552 if (iscsilun->allocmap_valid == NULL) { 553 return false; 554 } 555 assert(iscsilun->cluster_size); 556 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 557 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 558 offset / iscsilun->cluster_size) == size); 559 } 560 561 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 562 IscsiLun *iscsilun) 563 { 564 while (!iTask->complete) { 565 iscsi_set_events(iscsilun); 566 qemu_mutex_unlock(&iscsilun->mutex); 567 qemu_coroutine_yield(); 568 qemu_mutex_lock(&iscsilun->mutex); 569 } 570 } 571 572 static int coroutine_fn 573 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 574 QEMUIOVector *iov, int flags) 575 { 576 IscsiLun *iscsilun = bs->opaque; 577 struct IscsiTask iTask; 578 uint64_t lba; 579 uint32_t num_sectors; 580 bool fua = flags & BDRV_REQ_FUA; 581 int r = 0; 582 583 if (fua) { 584 assert(iscsilun->dpofua); 585 } 586 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 587 return -EINVAL; 588 } 589 590 if (bs->bl.max_transfer) { 591 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 592 } 593 594 lba = sector_qemu2lun(sector_num, iscsilun); 595 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 596 iscsi_co_init_iscsitask(iscsilun, &iTask); 597 qemu_mutex_lock(&iscsilun->mutex); 598 retry: 599 if (iscsilun->use_16_for_rw) { 600 #if LIBISCSI_API_VERSION >= (20160603) 601 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 602 NULL, num_sectors * iscsilun->block_size, 603 iscsilun->block_size, 0, 0, fua, 0, 0, 604 iscsi_co_generic_cb, &iTask, 605 (struct scsi_iovec *)iov->iov, iov->niov); 606 } else { 607 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 608 NULL, num_sectors * iscsilun->block_size, 609 iscsilun->block_size, 0, 0, fua, 0, 0, 610 iscsi_co_generic_cb, &iTask, 611 (struct scsi_iovec *)iov->iov, iov->niov); 612 } 613 #else 614 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 615 NULL, num_sectors * iscsilun->block_size, 616 iscsilun->block_size, 0, 0, fua, 0, 0, 617 iscsi_co_generic_cb, &iTask); 618 } else { 619 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 620 NULL, num_sectors * iscsilun->block_size, 621 iscsilun->block_size, 0, 0, fua, 0, 0, 622 iscsi_co_generic_cb, &iTask); 623 } 624 #endif 625 if (iTask.task == NULL) { 626 qemu_mutex_unlock(&iscsilun->mutex); 627 return -ENOMEM; 628 } 629 #if LIBISCSI_API_VERSION < (20160603) 630 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 631 iov->niov); 632 #endif 633 iscsi_co_wait_for_task(&iTask, iscsilun); 634 635 if (iTask.task != NULL) { 636 scsi_free_scsi_task(iTask.task); 637 iTask.task = NULL; 638 } 639 640 if (iTask.do_retry) { 641 iTask.complete = 0; 642 goto retry; 643 } 644 645 if (iTask.status != SCSI_STATUS_GOOD) { 646 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 647 nb_sectors * BDRV_SECTOR_SIZE); 648 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 649 iTask.err_str); 650 r = iTask.err_code; 651 goto out_unlock; 652 } 653 654 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 655 nb_sectors * BDRV_SECTOR_SIZE); 656 657 out_unlock: 658 qemu_mutex_unlock(&iscsilun->mutex); 659 g_free(iTask.err_str); 660 return r; 661 } 662 663 664 665 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 666 bool want_zero, int64_t offset, 667 int64_t bytes, int64_t *pnum, 668 int64_t *map, 669 BlockDriverState **file) 670 { 671 IscsiLun *iscsilun = bs->opaque; 672 struct scsi_get_lba_status *lbas = NULL; 673 struct scsi_lba_status_descriptor *lbasd = NULL; 674 struct IscsiTask iTask; 675 uint64_t lba; 676 int ret; 677 678 iscsi_co_init_iscsitask(iscsilun, &iTask); 679 680 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 681 682 /* default to all sectors allocated */ 683 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 684 if (map) { 685 *map = offset; 686 } 687 *pnum = bytes; 688 689 /* LUN does not support logical block provisioning */ 690 if (!iscsilun->lbpme) { 691 goto out; 692 } 693 694 lba = offset / iscsilun->block_size; 695 696 qemu_mutex_lock(&iscsilun->mutex); 697 retry: 698 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 699 lba, 8 + 16, iscsi_co_generic_cb, 700 &iTask) == NULL) { 701 ret = -ENOMEM; 702 goto out_unlock; 703 } 704 iscsi_co_wait_for_task(&iTask, iscsilun); 705 706 if (iTask.do_retry) { 707 if (iTask.task != NULL) { 708 scsi_free_scsi_task(iTask.task); 709 iTask.task = NULL; 710 } 711 iTask.complete = 0; 712 goto retry; 713 } 714 715 if (iTask.status != SCSI_STATUS_GOOD) { 716 /* in case the get_lba_status_callout fails (i.e. 717 * because the device is busy or the cmd is not 718 * supported) we pretend all blocks are allocated 719 * for backwards compatibility */ 720 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 721 lba, iTask.err_str); 722 goto out_unlock; 723 } 724 725 lbas = scsi_datain_unmarshall(iTask.task); 726 if (lbas == NULL) { 727 ret = -EIO; 728 goto out_unlock; 729 } 730 731 lbasd = &lbas->descriptors[0]; 732 733 if (lba != lbasd->lba) { 734 ret = -EIO; 735 goto out_unlock; 736 } 737 738 *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size; 739 740 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 741 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 742 ret &= ~BDRV_BLOCK_DATA; 743 if (iscsilun->lbprz) { 744 ret |= BDRV_BLOCK_ZERO; 745 } 746 } 747 748 if (ret & BDRV_BLOCK_ZERO) { 749 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 750 } else { 751 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 752 } 753 754 if (*pnum > bytes) { 755 *pnum = bytes; 756 } 757 out_unlock: 758 qemu_mutex_unlock(&iscsilun->mutex); 759 g_free(iTask.err_str); 760 out: 761 if (iTask.task != NULL) { 762 scsi_free_scsi_task(iTask.task); 763 } 764 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 765 *file = bs; 766 } 767 return ret; 768 } 769 770 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 771 int64_t sector_num, int nb_sectors, 772 QEMUIOVector *iov) 773 { 774 IscsiLun *iscsilun = bs->opaque; 775 struct IscsiTask iTask; 776 uint64_t lba; 777 uint32_t num_sectors; 778 int r = 0; 779 780 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 781 return -EINVAL; 782 } 783 784 if (bs->bl.max_transfer) { 785 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 786 } 787 788 /* if cache.direct is off and we have a valid entry in our allocation map 789 * we can skip checking the block status and directly return zeroes if 790 * the request falls within an unallocated area */ 791 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 792 nb_sectors * BDRV_SECTOR_SIZE) && 793 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 794 nb_sectors * BDRV_SECTOR_SIZE)) { 795 qemu_iovec_memset(iov, 0, 0x00, iov->size); 796 return 0; 797 } 798 799 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 800 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 801 nb_sectors * BDRV_SECTOR_SIZE) && 802 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 803 nb_sectors * BDRV_SECTOR_SIZE)) { 804 int64_t pnum; 805 /* check the block status from the beginning of the cluster 806 * containing the start sector */ 807 int64_t head; 808 int ret; 809 810 assert(iscsilun->cluster_size); 811 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 812 ret = iscsi_co_block_status(bs, true, 813 sector_num * BDRV_SECTOR_SIZE - head, 814 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 815 if (ret < 0) { 816 return ret; 817 } 818 /* if the whole request falls into an unallocated area we can avoid 819 * reading and directly return zeroes instead */ 820 if (ret & BDRV_BLOCK_ZERO && 821 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 822 qemu_iovec_memset(iov, 0, 0x00, iov->size); 823 return 0; 824 } 825 } 826 827 lba = sector_qemu2lun(sector_num, iscsilun); 828 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 829 830 iscsi_co_init_iscsitask(iscsilun, &iTask); 831 qemu_mutex_lock(&iscsilun->mutex); 832 retry: 833 if (iscsilun->use_16_for_rw) { 834 #if LIBISCSI_API_VERSION >= (20160603) 835 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 836 num_sectors * iscsilun->block_size, 837 iscsilun->block_size, 0, 0, 0, 0, 0, 838 iscsi_co_generic_cb, &iTask, 839 (struct scsi_iovec *)iov->iov, iov->niov); 840 } else { 841 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 842 num_sectors * iscsilun->block_size, 843 iscsilun->block_size, 844 0, 0, 0, 0, 0, 845 iscsi_co_generic_cb, &iTask, 846 (struct scsi_iovec *)iov->iov, iov->niov); 847 } 848 #else 849 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 850 num_sectors * iscsilun->block_size, 851 iscsilun->block_size, 0, 0, 0, 0, 0, 852 iscsi_co_generic_cb, &iTask); 853 } else { 854 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 855 num_sectors * iscsilun->block_size, 856 iscsilun->block_size, 857 0, 0, 0, 0, 0, 858 iscsi_co_generic_cb, &iTask); 859 } 860 #endif 861 if (iTask.task == NULL) { 862 qemu_mutex_unlock(&iscsilun->mutex); 863 return -ENOMEM; 864 } 865 #if LIBISCSI_API_VERSION < (20160603) 866 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 867 #endif 868 869 iscsi_co_wait_for_task(&iTask, iscsilun); 870 if (iTask.task != NULL) { 871 scsi_free_scsi_task(iTask.task); 872 iTask.task = NULL; 873 } 874 875 if (iTask.do_retry) { 876 iTask.complete = 0; 877 goto retry; 878 } 879 880 if (iTask.status != SCSI_STATUS_GOOD) { 881 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 882 lba, iTask.err_str); 883 r = iTask.err_code; 884 } 885 886 qemu_mutex_unlock(&iscsilun->mutex); 887 g_free(iTask.err_str); 888 return r; 889 } 890 891 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 892 { 893 IscsiLun *iscsilun = bs->opaque; 894 struct IscsiTask iTask; 895 int r = 0; 896 897 iscsi_co_init_iscsitask(iscsilun, &iTask); 898 qemu_mutex_lock(&iscsilun->mutex); 899 retry: 900 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 901 0, iscsi_co_generic_cb, &iTask) == NULL) { 902 qemu_mutex_unlock(&iscsilun->mutex); 903 return -ENOMEM; 904 } 905 906 iscsi_co_wait_for_task(&iTask, iscsilun); 907 908 if (iTask.task != NULL) { 909 scsi_free_scsi_task(iTask.task); 910 iTask.task = NULL; 911 } 912 913 if (iTask.do_retry) { 914 iTask.complete = 0; 915 goto retry; 916 } 917 918 if (iTask.status != SCSI_STATUS_GOOD) { 919 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 920 r = iTask.err_code; 921 } 922 923 qemu_mutex_unlock(&iscsilun->mutex); 924 g_free(iTask.err_str); 925 return r; 926 } 927 928 #ifdef __linux__ 929 /* Called (via iscsi_service) with QemuMutex held. */ 930 static void 931 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 932 void *command_data, void *opaque) 933 { 934 IscsiAIOCB *acb = opaque; 935 936 g_free(acb->buf); 937 acb->buf = NULL; 938 939 acb->status = 0; 940 if (status < 0) { 941 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 942 iscsi_get_error(iscsi)); 943 acb->status = iscsi_translate_sense(&acb->task->sense); 944 } 945 946 acb->ioh->driver_status = 0; 947 acb->ioh->host_status = 0; 948 acb->ioh->resid = 0; 949 acb->ioh->status = status; 950 951 #define SG_ERR_DRIVER_SENSE 0x08 952 953 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 954 int ss; 955 956 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 957 958 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 959 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 960 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 961 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 962 } 963 964 iscsi_schedule_bh(acb); 965 } 966 967 static void iscsi_ioctl_bh_completion(void *opaque) 968 { 969 IscsiAIOCB *acb = opaque; 970 971 qemu_bh_delete(acb->bh); 972 acb->common.cb(acb->common.opaque, acb->ret); 973 qemu_aio_unref(acb); 974 } 975 976 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 977 { 978 BlockDriverState *bs = acb->common.bs; 979 IscsiLun *iscsilun = bs->opaque; 980 int ret = 0; 981 982 switch (req) { 983 case SG_GET_VERSION_NUM: 984 *(int *)buf = 30000; 985 break; 986 case SG_GET_SCSI_ID: 987 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 988 break; 989 default: 990 ret = -EINVAL; 991 } 992 assert(!acb->bh); 993 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 994 iscsi_ioctl_bh_completion, acb); 995 acb->ret = ret; 996 qemu_bh_schedule(acb->bh); 997 } 998 999 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1000 unsigned long int req, void *buf, 1001 BlockCompletionFunc *cb, void *opaque) 1002 { 1003 IscsiLun *iscsilun = bs->opaque; 1004 struct iscsi_context *iscsi = iscsilun->iscsi; 1005 struct iscsi_data data; 1006 IscsiAIOCB *acb; 1007 1008 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1009 1010 acb->iscsilun = iscsilun; 1011 acb->bh = NULL; 1012 acb->status = -EINPROGRESS; 1013 acb->buf = NULL; 1014 acb->ioh = buf; 1015 1016 if (req != SG_IO) { 1017 iscsi_ioctl_handle_emulated(acb, req, buf); 1018 return &acb->common; 1019 } 1020 1021 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1022 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1023 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1024 qemu_aio_unref(acb); 1025 return NULL; 1026 } 1027 1028 acb->task = malloc(sizeof(struct scsi_task)); 1029 if (acb->task == NULL) { 1030 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1031 iscsi_get_error(iscsi)); 1032 qemu_aio_unref(acb); 1033 return NULL; 1034 } 1035 memset(acb->task, 0, sizeof(struct scsi_task)); 1036 1037 switch (acb->ioh->dxfer_direction) { 1038 case SG_DXFER_TO_DEV: 1039 acb->task->xfer_dir = SCSI_XFER_WRITE; 1040 break; 1041 case SG_DXFER_FROM_DEV: 1042 acb->task->xfer_dir = SCSI_XFER_READ; 1043 break; 1044 default: 1045 acb->task->xfer_dir = SCSI_XFER_NONE; 1046 break; 1047 } 1048 1049 acb->task->cdb_size = acb->ioh->cmd_len; 1050 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1051 acb->task->expxferlen = acb->ioh->dxfer_len; 1052 1053 data.size = 0; 1054 qemu_mutex_lock(&iscsilun->mutex); 1055 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1056 if (acb->ioh->iovec_count == 0) { 1057 data.data = acb->ioh->dxferp; 1058 data.size = acb->ioh->dxfer_len; 1059 } else { 1060 scsi_task_set_iov_out(acb->task, 1061 (struct scsi_iovec *) acb->ioh->dxferp, 1062 acb->ioh->iovec_count); 1063 } 1064 } 1065 1066 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1067 iscsi_aio_ioctl_cb, 1068 (data.size > 0) ? &data : NULL, 1069 acb) != 0) { 1070 qemu_mutex_unlock(&iscsilun->mutex); 1071 scsi_free_scsi_task(acb->task); 1072 qemu_aio_unref(acb); 1073 return NULL; 1074 } 1075 1076 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1077 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1078 if (acb->ioh->iovec_count == 0) { 1079 scsi_task_add_data_in_buffer(acb->task, 1080 acb->ioh->dxfer_len, 1081 acb->ioh->dxferp); 1082 } else { 1083 scsi_task_set_iov_in(acb->task, 1084 (struct scsi_iovec *) acb->ioh->dxferp, 1085 acb->ioh->iovec_count); 1086 } 1087 } 1088 1089 iscsi_set_events(iscsilun); 1090 qemu_mutex_unlock(&iscsilun->mutex); 1091 1092 return &acb->common; 1093 } 1094 1095 #endif 1096 1097 static int64_t 1098 iscsi_getlength(BlockDriverState *bs) 1099 { 1100 IscsiLun *iscsilun = bs->opaque; 1101 int64_t len; 1102 1103 len = iscsilun->num_blocks; 1104 len *= iscsilun->block_size; 1105 1106 return len; 1107 } 1108 1109 static int 1110 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1111 { 1112 IscsiLun *iscsilun = bs->opaque; 1113 struct IscsiTask iTask; 1114 struct unmap_list list; 1115 int r = 0; 1116 1117 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1118 return -ENOTSUP; 1119 } 1120 1121 if (!iscsilun->lbp.lbpu) { 1122 /* UNMAP is not supported by the target */ 1123 return 0; 1124 } 1125 1126 list.lba = offset / iscsilun->block_size; 1127 list.num = bytes / iscsilun->block_size; 1128 1129 iscsi_co_init_iscsitask(iscsilun, &iTask); 1130 qemu_mutex_lock(&iscsilun->mutex); 1131 retry: 1132 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1133 iscsi_co_generic_cb, &iTask) == NULL) { 1134 r = -ENOMEM; 1135 goto out_unlock; 1136 } 1137 1138 iscsi_co_wait_for_task(&iTask, iscsilun); 1139 1140 if (iTask.task != NULL) { 1141 scsi_free_scsi_task(iTask.task); 1142 iTask.task = NULL; 1143 } 1144 1145 if (iTask.do_retry) { 1146 iTask.complete = 0; 1147 goto retry; 1148 } 1149 1150 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1151 1152 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1153 /* the target might fail with a check condition if it 1154 is not happy with the alignment of the UNMAP request 1155 we silently fail in this case */ 1156 goto out_unlock; 1157 } 1158 1159 if (iTask.status != SCSI_STATUS_GOOD) { 1160 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1161 list.lba, iTask.err_str); 1162 r = iTask.err_code; 1163 goto out_unlock; 1164 } 1165 1166 out_unlock: 1167 qemu_mutex_unlock(&iscsilun->mutex); 1168 g_free(iTask.err_str); 1169 return r; 1170 } 1171 1172 static int 1173 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1174 int bytes, BdrvRequestFlags flags) 1175 { 1176 IscsiLun *iscsilun = bs->opaque; 1177 struct IscsiTask iTask; 1178 uint64_t lba; 1179 uint32_t nb_blocks; 1180 bool use_16_for_ws = iscsilun->use_16_for_rw; 1181 int r = 0; 1182 1183 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1184 return -ENOTSUP; 1185 } 1186 1187 if (flags & BDRV_REQ_MAY_UNMAP) { 1188 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1189 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1190 use_16_for_ws = true; 1191 } 1192 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1193 /* WRITESAME16 with UNMAP is not supported by the target, 1194 * fall back and try WRITESAME10/16 without UNMAP */ 1195 flags &= ~BDRV_REQ_MAY_UNMAP; 1196 use_16_for_ws = iscsilun->use_16_for_rw; 1197 } 1198 } 1199 1200 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1201 /* WRITESAME without UNMAP is not supported by the target */ 1202 return -ENOTSUP; 1203 } 1204 1205 lba = offset / iscsilun->block_size; 1206 nb_blocks = bytes / iscsilun->block_size; 1207 1208 if (iscsilun->zeroblock == NULL) { 1209 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1210 if (iscsilun->zeroblock == NULL) { 1211 return -ENOMEM; 1212 } 1213 } 1214 1215 qemu_mutex_lock(&iscsilun->mutex); 1216 iscsi_co_init_iscsitask(iscsilun, &iTask); 1217 retry: 1218 if (use_16_for_ws) { 1219 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1220 iscsilun->zeroblock, iscsilun->block_size, 1221 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1222 0, 0, iscsi_co_generic_cb, &iTask); 1223 } else { 1224 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1225 iscsilun->zeroblock, iscsilun->block_size, 1226 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1227 0, 0, iscsi_co_generic_cb, &iTask); 1228 } 1229 if (iTask.task == NULL) { 1230 qemu_mutex_unlock(&iscsilun->mutex); 1231 return -ENOMEM; 1232 } 1233 1234 iscsi_co_wait_for_task(&iTask, iscsilun); 1235 1236 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1237 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1238 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1239 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1240 /* WRITE SAME is not supported by the target */ 1241 iscsilun->has_write_same = false; 1242 scsi_free_scsi_task(iTask.task); 1243 r = -ENOTSUP; 1244 goto out_unlock; 1245 } 1246 1247 if (iTask.task != NULL) { 1248 scsi_free_scsi_task(iTask.task); 1249 iTask.task = NULL; 1250 } 1251 1252 if (iTask.do_retry) { 1253 iTask.complete = 0; 1254 goto retry; 1255 } 1256 1257 if (iTask.status != SCSI_STATUS_GOOD) { 1258 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1259 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1260 lba, iTask.err_str); 1261 r = iTask.err_code; 1262 goto out_unlock; 1263 } 1264 1265 if (flags & BDRV_REQ_MAY_UNMAP) { 1266 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1267 } else { 1268 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1269 } 1270 1271 out_unlock: 1272 qemu_mutex_unlock(&iscsilun->mutex); 1273 g_free(iTask.err_str); 1274 return r; 1275 } 1276 1277 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1278 Error **errp) 1279 { 1280 const char *user = NULL; 1281 const char *password = NULL; 1282 const char *secretid; 1283 char *secret = NULL; 1284 1285 user = qemu_opt_get(opts, "user"); 1286 if (!user) { 1287 return; 1288 } 1289 1290 secretid = qemu_opt_get(opts, "password-secret"); 1291 password = qemu_opt_get(opts, "password"); 1292 if (secretid && password) { 1293 error_setg(errp, "'password' and 'password-secret' properties are " 1294 "mutually exclusive"); 1295 return; 1296 } 1297 if (secretid) { 1298 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1299 if (!secret) { 1300 return; 1301 } 1302 password = secret; 1303 } else if (!password) { 1304 error_setg(errp, "CHAP username specified but no password was given"); 1305 return; 1306 } 1307 1308 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1309 error_setg(errp, "Failed to set initiator username and password"); 1310 } 1311 1312 g_free(secret); 1313 } 1314 1315 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1316 Error **errp) 1317 { 1318 const char *digest = NULL; 1319 1320 digest = qemu_opt_get(opts, "header-digest"); 1321 if (!digest) { 1322 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1323 } else if (!strcmp(digest, "crc32c")) { 1324 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1325 } else if (!strcmp(digest, "none")) { 1326 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1327 } else if (!strcmp(digest, "crc32c-none")) { 1328 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1329 } else if (!strcmp(digest, "none-crc32c")) { 1330 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1331 } else { 1332 error_setg(errp, "Invalid header-digest setting : %s", digest); 1333 } 1334 } 1335 1336 static char *get_initiator_name(QemuOpts *opts) 1337 { 1338 const char *name; 1339 char *iscsi_name; 1340 UuidInfo *uuid_info; 1341 1342 name = qemu_opt_get(opts, "initiator-name"); 1343 if (name) { 1344 return g_strdup(name); 1345 } 1346 1347 uuid_info = qmp_query_uuid(NULL); 1348 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1349 name = qemu_get_vm_name(); 1350 } else { 1351 name = uuid_info->UUID; 1352 } 1353 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1354 name ? ":" : "", name ? name : ""); 1355 qapi_free_UuidInfo(uuid_info); 1356 return iscsi_name; 1357 } 1358 1359 static void iscsi_nop_timed_event(void *opaque) 1360 { 1361 IscsiLun *iscsilun = opaque; 1362 1363 qemu_mutex_lock(&iscsilun->mutex); 1364 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1365 error_report("iSCSI: NOP timeout. Reconnecting..."); 1366 iscsilun->request_timed_out = true; 1367 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1368 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1369 goto out; 1370 } 1371 1372 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1373 iscsi_set_events(iscsilun); 1374 1375 out: 1376 qemu_mutex_unlock(&iscsilun->mutex); 1377 } 1378 1379 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1380 { 1381 struct scsi_task *task = NULL; 1382 struct scsi_readcapacity10 *rc10 = NULL; 1383 struct scsi_readcapacity16 *rc16 = NULL; 1384 int retries = ISCSI_CMD_RETRIES; 1385 1386 do { 1387 if (task != NULL) { 1388 scsi_free_scsi_task(task); 1389 task = NULL; 1390 } 1391 1392 switch (iscsilun->type) { 1393 case TYPE_DISK: 1394 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1395 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1396 rc16 = scsi_datain_unmarshall(task); 1397 if (rc16 == NULL) { 1398 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1399 } else { 1400 iscsilun->block_size = rc16->block_length; 1401 iscsilun->num_blocks = rc16->returned_lba + 1; 1402 iscsilun->lbpme = !!rc16->lbpme; 1403 iscsilun->lbprz = !!rc16->lbprz; 1404 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1405 } 1406 break; 1407 } 1408 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1409 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1410 break; 1411 } 1412 /* Fall through and try READ CAPACITY(10) instead. */ 1413 case TYPE_ROM: 1414 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1415 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1416 rc10 = scsi_datain_unmarshall(task); 1417 if (rc10 == NULL) { 1418 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1419 } else { 1420 iscsilun->block_size = rc10->block_size; 1421 if (rc10->lba == 0) { 1422 /* blank disk loaded */ 1423 iscsilun->num_blocks = 0; 1424 } else { 1425 iscsilun->num_blocks = rc10->lba + 1; 1426 } 1427 } 1428 } 1429 break; 1430 default: 1431 return; 1432 } 1433 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1434 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1435 && retries-- > 0); 1436 1437 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1438 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1439 } else if (!iscsilun->block_size || 1440 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1441 error_setg(errp, "iSCSI: the target returned an invalid " 1442 "block size of %d.", iscsilun->block_size); 1443 } 1444 if (task) { 1445 scsi_free_scsi_task(task); 1446 } 1447 } 1448 1449 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1450 int evpd, int pc, void **inq, Error **errp) 1451 { 1452 int full_size; 1453 struct scsi_task *task = NULL; 1454 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1455 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1456 goto fail; 1457 } 1458 full_size = scsi_datain_getfullsize(task); 1459 if (full_size > task->datain.size) { 1460 scsi_free_scsi_task(task); 1461 1462 /* we need more data for the full list */ 1463 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1464 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1465 goto fail; 1466 } 1467 } 1468 1469 *inq = scsi_datain_unmarshall(task); 1470 if (*inq == NULL) { 1471 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1472 goto fail_with_err; 1473 } 1474 1475 return task; 1476 1477 fail: 1478 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1479 iscsi_get_error(iscsi)); 1480 fail_with_err: 1481 if (task != NULL) { 1482 scsi_free_scsi_task(task); 1483 } 1484 return NULL; 1485 } 1486 1487 static void iscsi_detach_aio_context(BlockDriverState *bs) 1488 { 1489 IscsiLun *iscsilun = bs->opaque; 1490 1491 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1492 false, NULL, NULL, NULL, NULL); 1493 iscsilun->events = 0; 1494 1495 if (iscsilun->nop_timer) { 1496 timer_del(iscsilun->nop_timer); 1497 timer_free(iscsilun->nop_timer); 1498 iscsilun->nop_timer = NULL; 1499 } 1500 if (iscsilun->event_timer) { 1501 timer_del(iscsilun->event_timer); 1502 timer_free(iscsilun->event_timer); 1503 iscsilun->event_timer = NULL; 1504 } 1505 } 1506 1507 static void iscsi_attach_aio_context(BlockDriverState *bs, 1508 AioContext *new_context) 1509 { 1510 IscsiLun *iscsilun = bs->opaque; 1511 1512 iscsilun->aio_context = new_context; 1513 iscsi_set_events(iscsilun); 1514 1515 /* Set up a timer for sending out iSCSI NOPs */ 1516 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1517 QEMU_CLOCK_REALTIME, SCALE_MS, 1518 iscsi_nop_timed_event, iscsilun); 1519 timer_mod(iscsilun->nop_timer, 1520 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1521 1522 /* Set up a timer for periodic calls to iscsi_set_events and to 1523 * scan for command timeout */ 1524 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1525 QEMU_CLOCK_REALTIME, SCALE_MS, 1526 iscsi_timed_check_events, iscsilun); 1527 timer_mod(iscsilun->event_timer, 1528 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1529 } 1530 1531 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1532 { 1533 struct scsi_task *task; 1534 struct scsi_mode_sense *ms = NULL; 1535 iscsilun->write_protected = false; 1536 iscsilun->dpofua = false; 1537 1538 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1539 1, SCSI_MODESENSE_PC_CURRENT, 1540 0x3F, 0, 255); 1541 if (task == NULL) { 1542 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1543 iscsi_get_error(iscsilun->iscsi)); 1544 goto out; 1545 } 1546 1547 if (task->status != SCSI_STATUS_GOOD) { 1548 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1549 goto out; 1550 } 1551 ms = scsi_datain_unmarshall(task); 1552 if (!ms) { 1553 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1554 iscsi_get_error(iscsilun->iscsi)); 1555 goto out; 1556 } 1557 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1558 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1559 1560 out: 1561 if (task) { 1562 scsi_free_scsi_task(task); 1563 } 1564 } 1565 1566 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1567 { 1568 QemuOptsList *list; 1569 QemuOpts *opts; 1570 const char *user, *password, *password_secret, *initiator_name, 1571 *header_digest, *timeout; 1572 1573 list = qemu_find_opts("iscsi"); 1574 if (!list) { 1575 return; 1576 } 1577 1578 opts = qemu_opts_find(list, target); 1579 if (opts == NULL) { 1580 opts = QTAILQ_FIRST(&list->head); 1581 if (!opts) { 1582 return; 1583 } 1584 } 1585 1586 user = qemu_opt_get(opts, "user"); 1587 if (user) { 1588 qdict_set_default_str(options, "user", user); 1589 } 1590 1591 password = qemu_opt_get(opts, "password"); 1592 if (password) { 1593 qdict_set_default_str(options, "password", password); 1594 } 1595 1596 password_secret = qemu_opt_get(opts, "password-secret"); 1597 if (password_secret) { 1598 qdict_set_default_str(options, "password-secret", password_secret); 1599 } 1600 1601 initiator_name = qemu_opt_get(opts, "initiator-name"); 1602 if (initiator_name) { 1603 qdict_set_default_str(options, "initiator-name", initiator_name); 1604 } 1605 1606 header_digest = qemu_opt_get(opts, "header-digest"); 1607 if (header_digest) { 1608 /* -iscsi takes upper case values, but QAPI only supports lower case 1609 * enum constant names, so we have to convert here. */ 1610 char *qapi_value = g_ascii_strdown(header_digest, -1); 1611 qdict_set_default_str(options, "header-digest", qapi_value); 1612 g_free(qapi_value); 1613 } 1614 1615 timeout = qemu_opt_get(opts, "timeout"); 1616 if (timeout) { 1617 qdict_set_default_str(options, "timeout", timeout); 1618 } 1619 } 1620 1621 /* 1622 * We support iscsi url's on the form 1623 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1624 */ 1625 static void iscsi_parse_filename(const char *filename, QDict *options, 1626 Error **errp) 1627 { 1628 struct iscsi_url *iscsi_url; 1629 const char *transport_name; 1630 char *lun_str; 1631 1632 iscsi_url = iscsi_parse_full_url(NULL, filename); 1633 if (iscsi_url == NULL) { 1634 error_setg(errp, "Failed to parse URL : %s", filename); 1635 return; 1636 } 1637 1638 #if LIBISCSI_API_VERSION >= (20160603) 1639 switch (iscsi_url->transport) { 1640 case TCP_TRANSPORT: 1641 transport_name = "tcp"; 1642 break; 1643 case ISER_TRANSPORT: 1644 transport_name = "iser"; 1645 break; 1646 default: 1647 error_setg(errp, "Unknown transport type (%d)", 1648 iscsi_url->transport); 1649 return; 1650 } 1651 #else 1652 transport_name = "tcp"; 1653 #endif 1654 1655 qdict_set_default_str(options, "transport", transport_name); 1656 qdict_set_default_str(options, "portal", iscsi_url->portal); 1657 qdict_set_default_str(options, "target", iscsi_url->target); 1658 1659 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1660 qdict_set_default_str(options, "lun", lun_str); 1661 g_free(lun_str); 1662 1663 /* User/password from -iscsi take precedence over those from the URL */ 1664 iscsi_parse_iscsi_option(iscsi_url->target, options); 1665 1666 if (iscsi_url->user[0] != '\0') { 1667 qdict_set_default_str(options, "user", iscsi_url->user); 1668 qdict_set_default_str(options, "password", iscsi_url->passwd); 1669 } 1670 1671 iscsi_destroy_url(iscsi_url); 1672 } 1673 1674 static QemuOptsList runtime_opts = { 1675 .name = "iscsi", 1676 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1677 .desc = { 1678 { 1679 .name = "transport", 1680 .type = QEMU_OPT_STRING, 1681 }, 1682 { 1683 .name = "portal", 1684 .type = QEMU_OPT_STRING, 1685 }, 1686 { 1687 .name = "target", 1688 .type = QEMU_OPT_STRING, 1689 }, 1690 { 1691 .name = "user", 1692 .type = QEMU_OPT_STRING, 1693 }, 1694 { 1695 .name = "password", 1696 .type = QEMU_OPT_STRING, 1697 }, 1698 { 1699 .name = "password-secret", 1700 .type = QEMU_OPT_STRING, 1701 }, 1702 { 1703 .name = "lun", 1704 .type = QEMU_OPT_NUMBER, 1705 }, 1706 { 1707 .name = "initiator-name", 1708 .type = QEMU_OPT_STRING, 1709 }, 1710 { 1711 .name = "header-digest", 1712 .type = QEMU_OPT_STRING, 1713 }, 1714 { 1715 .name = "timeout", 1716 .type = QEMU_OPT_NUMBER, 1717 }, 1718 { /* end of list */ } 1719 }, 1720 }; 1721 1722 static void iscsi_save_designator(IscsiLun *lun, 1723 struct scsi_inquiry_device_identification *inq_di) 1724 { 1725 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1726 1727 for (desig = inq_di->designators; desig; desig = desig->next) { 1728 if (desig->association || 1729 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1730 continue; 1731 } 1732 /* NAA works better than T10 vendor ID based designator. */ 1733 if (!copy || copy->designator_type < desig->designator_type) { 1734 copy = desig; 1735 } 1736 } 1737 if (copy) { 1738 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1739 *lun->dd = *copy; 1740 lun->dd->next = NULL; 1741 lun->dd->designator = g_malloc(copy->designator_length); 1742 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1743 } 1744 } 1745 1746 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1747 Error **errp) 1748 { 1749 IscsiLun *iscsilun = bs->opaque; 1750 struct iscsi_context *iscsi = NULL; 1751 struct scsi_task *task = NULL; 1752 struct scsi_inquiry_standard *inq = NULL; 1753 struct scsi_inquiry_supported_pages *inq_vpd; 1754 char *initiator_name = NULL; 1755 QemuOpts *opts; 1756 Error *local_err = NULL; 1757 const char *transport_name, *portal, *target; 1758 #if LIBISCSI_API_VERSION >= (20160603) 1759 enum iscsi_transport_type transport; 1760 #endif 1761 int i, ret = 0, timeout = 0, lun; 1762 1763 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1764 qemu_opts_absorb_qdict(opts, options, &local_err); 1765 if (local_err) { 1766 error_propagate(errp, local_err); 1767 ret = -EINVAL; 1768 goto out; 1769 } 1770 1771 transport_name = qemu_opt_get(opts, "transport"); 1772 portal = qemu_opt_get(opts, "portal"); 1773 target = qemu_opt_get(opts, "target"); 1774 lun = qemu_opt_get_number(opts, "lun", 0); 1775 1776 if (!transport_name || !portal || !target) { 1777 error_setg(errp, "Need all of transport, portal and target options"); 1778 ret = -EINVAL; 1779 goto out; 1780 } 1781 1782 if (!strcmp(transport_name, "tcp")) { 1783 #if LIBISCSI_API_VERSION >= (20160603) 1784 transport = TCP_TRANSPORT; 1785 } else if (!strcmp(transport_name, "iser")) { 1786 transport = ISER_TRANSPORT; 1787 #else 1788 /* TCP is what older libiscsi versions always use */ 1789 #endif 1790 } else { 1791 error_setg(errp, "Unknown transport: %s", transport_name); 1792 ret = -EINVAL; 1793 goto out; 1794 } 1795 1796 memset(iscsilun, 0, sizeof(IscsiLun)); 1797 1798 initiator_name = get_initiator_name(opts); 1799 1800 iscsi = iscsi_create_context(initiator_name); 1801 if (iscsi == NULL) { 1802 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1803 ret = -ENOMEM; 1804 goto out; 1805 } 1806 #if LIBISCSI_API_VERSION >= (20160603) 1807 if (iscsi_init_transport(iscsi, transport)) { 1808 error_setg(errp, ("Error initializing transport.")); 1809 ret = -EINVAL; 1810 goto out; 1811 } 1812 #endif 1813 if (iscsi_set_targetname(iscsi, target)) { 1814 error_setg(errp, "iSCSI: Failed to set target name."); 1815 ret = -EINVAL; 1816 goto out; 1817 } 1818 1819 /* check if we got CHAP username/password via the options */ 1820 apply_chap(iscsi, opts, &local_err); 1821 if (local_err != NULL) { 1822 error_propagate(errp, local_err); 1823 ret = -EINVAL; 1824 goto out; 1825 } 1826 1827 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1828 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1829 ret = -EINVAL; 1830 goto out; 1831 } 1832 1833 /* check if we got HEADER_DIGEST via the options */ 1834 apply_header_digest(iscsi, opts, &local_err); 1835 if (local_err != NULL) { 1836 error_propagate(errp, local_err); 1837 ret = -EINVAL; 1838 goto out; 1839 } 1840 1841 /* timeout handling is broken in libiscsi before 1.15.0 */ 1842 timeout = qemu_opt_get_number(opts, "timeout", 0); 1843 #if LIBISCSI_API_VERSION >= 20150621 1844 iscsi_set_timeout(iscsi, timeout); 1845 #else 1846 if (timeout) { 1847 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1848 } 1849 #endif 1850 1851 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1852 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1853 iscsi_get_error(iscsi)); 1854 ret = -EINVAL; 1855 goto out; 1856 } 1857 1858 iscsilun->iscsi = iscsi; 1859 iscsilun->aio_context = bdrv_get_aio_context(bs); 1860 iscsilun->lun = lun; 1861 iscsilun->has_write_same = true; 1862 1863 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1864 (void **) &inq, errp); 1865 if (task == NULL) { 1866 ret = -EINVAL; 1867 goto out; 1868 } 1869 iscsilun->type = inq->periperal_device_type; 1870 scsi_free_scsi_task(task); 1871 task = NULL; 1872 1873 iscsi_modesense_sync(iscsilun); 1874 if (iscsilun->dpofua) { 1875 bs->supported_write_flags = BDRV_REQ_FUA; 1876 } 1877 1878 /* Check the write protect flag of the LUN if we want to write */ 1879 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1880 iscsilun->write_protected) { 1881 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1882 ret = -EACCES; 1883 goto out; 1884 } 1885 1886 iscsi_readcapacity_sync(iscsilun, &local_err); 1887 if (local_err != NULL) { 1888 error_propagate(errp, local_err); 1889 ret = -EINVAL; 1890 goto out; 1891 } 1892 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1893 1894 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1895 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1896 * will try to read from the device to guess the image format. 1897 */ 1898 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1899 bs->sg = true; 1900 } 1901 1902 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1903 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1904 (void **) &inq_vpd, errp); 1905 if (task == NULL) { 1906 ret = -EINVAL; 1907 goto out; 1908 } 1909 for (i = 0; i < inq_vpd->num_pages; i++) { 1910 struct scsi_task *inq_task; 1911 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1912 struct scsi_inquiry_block_limits *inq_bl; 1913 struct scsi_inquiry_device_identification *inq_di; 1914 switch (inq_vpd->pages[i]) { 1915 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1916 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1917 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1918 (void **) &inq_lbp, errp); 1919 if (inq_task == NULL) { 1920 ret = -EINVAL; 1921 goto out; 1922 } 1923 memcpy(&iscsilun->lbp, inq_lbp, 1924 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1925 scsi_free_scsi_task(inq_task); 1926 break; 1927 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1928 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1929 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1930 (void **) &inq_bl, errp); 1931 if (inq_task == NULL) { 1932 ret = -EINVAL; 1933 goto out; 1934 } 1935 memcpy(&iscsilun->bl, inq_bl, 1936 sizeof(struct scsi_inquiry_block_limits)); 1937 scsi_free_scsi_task(inq_task); 1938 break; 1939 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1940 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1941 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1942 (void **) &inq_di, errp); 1943 if (inq_task == NULL) { 1944 ret = -EINVAL; 1945 goto out; 1946 } 1947 iscsi_save_designator(iscsilun, inq_di); 1948 scsi_free_scsi_task(inq_task); 1949 break; 1950 default: 1951 break; 1952 } 1953 } 1954 scsi_free_scsi_task(task); 1955 task = NULL; 1956 1957 qemu_mutex_init(&iscsilun->mutex); 1958 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1959 1960 /* Guess the internal cluster (page) size of the iscsi target by the means 1961 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1962 * reasonable size */ 1963 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1964 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1965 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 1966 iscsilun->block_size; 1967 if (iscsilun->lbprz) { 1968 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1969 } 1970 } 1971 1972 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 1973 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1974 } 1975 1976 out: 1977 qemu_opts_del(opts); 1978 g_free(initiator_name); 1979 if (task != NULL) { 1980 scsi_free_scsi_task(task); 1981 } 1982 1983 if (ret) { 1984 if (iscsi != NULL) { 1985 if (iscsi_is_logged_in(iscsi)) { 1986 iscsi_logout_sync(iscsi); 1987 } 1988 iscsi_destroy_context(iscsi); 1989 } 1990 memset(iscsilun, 0, sizeof(IscsiLun)); 1991 } 1992 1993 return ret; 1994 } 1995 1996 static void iscsi_close(BlockDriverState *bs) 1997 { 1998 IscsiLun *iscsilun = bs->opaque; 1999 struct iscsi_context *iscsi = iscsilun->iscsi; 2000 2001 iscsi_detach_aio_context(bs); 2002 if (iscsi_is_logged_in(iscsi)) { 2003 iscsi_logout_sync(iscsi); 2004 } 2005 iscsi_destroy_context(iscsi); 2006 if (iscsilun->dd) { 2007 g_free(iscsilun->dd->designator); 2008 g_free(iscsilun->dd); 2009 } 2010 g_free(iscsilun->zeroblock); 2011 iscsi_allocmap_free(iscsilun); 2012 qemu_mutex_destroy(&iscsilun->mutex); 2013 memset(iscsilun, 0, sizeof(IscsiLun)); 2014 } 2015 2016 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2017 { 2018 /* We don't actually refresh here, but just return data queried in 2019 * iscsi_open(): iscsi targets don't change their limits. */ 2020 2021 IscsiLun *iscsilun = bs->opaque; 2022 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2023 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2024 2025 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2026 2027 bs->bl.request_alignment = block_size; 2028 2029 if (iscsilun->bl.max_xfer_len) { 2030 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2031 } 2032 2033 if (max_xfer_len * block_size < INT_MAX) { 2034 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2035 } 2036 2037 if (iscsilun->lbp.lbpu) { 2038 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2039 bs->bl.max_pdiscard = 2040 iscsilun->bl.max_unmap * iscsilun->block_size; 2041 } 2042 bs->bl.pdiscard_alignment = 2043 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2044 } else { 2045 bs->bl.pdiscard_alignment = iscsilun->block_size; 2046 } 2047 2048 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2049 bs->bl.max_pwrite_zeroes = 2050 iscsilun->bl.max_ws_len * iscsilun->block_size; 2051 } 2052 if (iscsilun->lbp.lbpws) { 2053 bs->bl.pwrite_zeroes_alignment = 2054 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2055 } else { 2056 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2057 } 2058 if (iscsilun->bl.opt_xfer_len && 2059 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2060 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2061 iscsilun->block_size); 2062 } 2063 } 2064 2065 /* Note that this will not re-establish a connection with an iSCSI target - it 2066 * is effectively a NOP. */ 2067 static int iscsi_reopen_prepare(BDRVReopenState *state, 2068 BlockReopenQueue *queue, Error **errp) 2069 { 2070 IscsiLun *iscsilun = state->bs->opaque; 2071 2072 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2073 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2074 return -EACCES; 2075 } 2076 return 0; 2077 } 2078 2079 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2080 { 2081 IscsiLun *iscsilun = reopen_state->bs->opaque; 2082 2083 /* the cache.direct status might have changed */ 2084 if (iscsilun->allocmap != NULL) { 2085 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2086 } 2087 } 2088 2089 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2090 PreallocMode prealloc, Error **errp) 2091 { 2092 IscsiLun *iscsilun = bs->opaque; 2093 Error *local_err = NULL; 2094 2095 if (prealloc != PREALLOC_MODE_OFF) { 2096 error_setg(errp, "Unsupported preallocation mode '%s'", 2097 PreallocMode_str(prealloc)); 2098 return -ENOTSUP; 2099 } 2100 2101 if (iscsilun->type != TYPE_DISK) { 2102 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2103 return -ENOTSUP; 2104 } 2105 2106 iscsi_readcapacity_sync(iscsilun, &local_err); 2107 if (local_err != NULL) { 2108 error_propagate(errp, local_err); 2109 return -EIO; 2110 } 2111 2112 if (offset > iscsi_getlength(bs)) { 2113 error_setg(errp, "Cannot grow iSCSI devices"); 2114 return -EINVAL; 2115 } 2116 2117 if (iscsilun->allocmap != NULL) { 2118 iscsi_allocmap_init(iscsilun, bs->open_flags); 2119 } 2120 2121 return 0; 2122 } 2123 2124 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2125 Error **errp) 2126 { 2127 int ret = 0; 2128 int64_t total_size = 0; 2129 BlockDriverState *bs; 2130 IscsiLun *iscsilun = NULL; 2131 QDict *bs_options; 2132 Error *local_err = NULL; 2133 2134 bs = bdrv_new(); 2135 2136 /* Read out options */ 2137 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2138 BDRV_SECTOR_SIZE); 2139 bs->opaque = g_new0(struct IscsiLun, 1); 2140 iscsilun = bs->opaque; 2141 2142 bs_options = qdict_new(); 2143 iscsi_parse_filename(filename, bs_options, &local_err); 2144 if (local_err) { 2145 error_propagate(errp, local_err); 2146 ret = -EINVAL; 2147 } else { 2148 ret = iscsi_open(bs, bs_options, 0, NULL); 2149 } 2150 qobject_unref(bs_options); 2151 2152 if (ret != 0) { 2153 goto out; 2154 } 2155 iscsi_detach_aio_context(bs); 2156 if (iscsilun->type != TYPE_DISK) { 2157 ret = -ENODEV; 2158 goto out; 2159 } 2160 if (bs->total_sectors < total_size) { 2161 ret = -ENOSPC; 2162 goto out; 2163 } 2164 2165 ret = 0; 2166 out: 2167 if (iscsilun->iscsi != NULL) { 2168 iscsi_destroy_context(iscsilun->iscsi); 2169 } 2170 g_free(bs->opaque); 2171 bs->opaque = NULL; 2172 bdrv_unref(bs); 2173 return ret; 2174 } 2175 2176 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2177 { 2178 IscsiLun *iscsilun = bs->opaque; 2179 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2180 bdi->cluster_size = iscsilun->cluster_size; 2181 return 0; 2182 } 2183 2184 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2185 Error **errp) 2186 { 2187 IscsiLun *iscsilun = bs->opaque; 2188 iscsi_allocmap_invalidate(iscsilun); 2189 } 2190 2191 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2192 BdrvChild *src, 2193 uint64_t src_offset, 2194 BdrvChild *dst, 2195 uint64_t dst_offset, 2196 uint64_t bytes, 2197 BdrvRequestFlags read_flags, 2198 BdrvRequestFlags write_flags) 2199 { 2200 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2201 read_flags, write_flags); 2202 } 2203 2204 static struct scsi_task *iscsi_xcopy_task(int param_len) 2205 { 2206 struct scsi_task *task; 2207 2208 task = g_new0(struct scsi_task, 1); 2209 2210 task->cdb[0] = EXTENDED_COPY; 2211 task->cdb[10] = (param_len >> 24) & 0xFF; 2212 task->cdb[11] = (param_len >> 16) & 0xFF; 2213 task->cdb[12] = (param_len >> 8) & 0xFF; 2214 task->cdb[13] = param_len & 0xFF; 2215 task->cdb_size = 16; 2216 task->xfer_dir = SCSI_XFER_WRITE; 2217 task->expxferlen = param_len; 2218 2219 return task; 2220 } 2221 2222 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2223 { 2224 struct scsi_inquiry_device_designator *dd = lun->dd; 2225 2226 memset(desc, 0, 32); 2227 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2228 desc[4] = dd->code_set; 2229 desc[5] = (dd->designator_type & 0xF) 2230 | ((dd->association & 3) << 4); 2231 desc[7] = dd->designator_length; 2232 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2233 2234 desc[28] = 0; 2235 desc[29] = (lun->block_size >> 16) & 0xFF; 2236 desc[30] = (lun->block_size >> 8) & 0xFF; 2237 desc[31] = lun->block_size & 0xFF; 2238 } 2239 2240 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2241 int dst_index) 2242 { 2243 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2244 hdr[1] = ((dc << 1) | cat) & 0xFF; 2245 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2246 /* don't account for the first 4 bytes in descriptor header*/ 2247 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2248 hdr[4] = (src_index >> 8) & 0xFF; 2249 hdr[5] = src_index & 0xFF; 2250 hdr[6] = (dst_index >> 8) & 0xFF; 2251 hdr[7] = dst_index & 0xFF; 2252 } 2253 2254 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2255 int src_index, int dst_index, int num_blks, 2256 uint64_t src_lba, uint64_t dst_lba) 2257 { 2258 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2259 2260 /* The caller should verify the request size */ 2261 assert(num_blks < 65536); 2262 desc[10] = (num_blks >> 8) & 0xFF; 2263 desc[11] = num_blks & 0xFF; 2264 desc[12] = (src_lba >> 56) & 0xFF; 2265 desc[13] = (src_lba >> 48) & 0xFF; 2266 desc[14] = (src_lba >> 40) & 0xFF; 2267 desc[15] = (src_lba >> 32) & 0xFF; 2268 desc[16] = (src_lba >> 24) & 0xFF; 2269 desc[17] = (src_lba >> 16) & 0xFF; 2270 desc[18] = (src_lba >> 8) & 0xFF; 2271 desc[19] = src_lba & 0xFF; 2272 desc[20] = (dst_lba >> 56) & 0xFF; 2273 desc[21] = (dst_lba >> 48) & 0xFF; 2274 desc[22] = (dst_lba >> 40) & 0xFF; 2275 desc[23] = (dst_lba >> 32) & 0xFF; 2276 desc[24] = (dst_lba >> 24) & 0xFF; 2277 desc[25] = (dst_lba >> 16) & 0xFF; 2278 desc[26] = (dst_lba >> 8) & 0xFF; 2279 desc[27] = dst_lba & 0xFF; 2280 } 2281 2282 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2283 int list_id_usage, int prio, 2284 int tgt_desc_len, 2285 int seg_desc_len, int inline_data_len) 2286 { 2287 buf[0] = list_id; 2288 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2289 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2290 buf[3] = tgt_desc_len & 0xFF; 2291 buf[8] = (seg_desc_len >> 24) & 0xFF; 2292 buf[9] = (seg_desc_len >> 16) & 0xFF; 2293 buf[10] = (seg_desc_len >> 8) & 0xFF; 2294 buf[11] = seg_desc_len & 0xFF; 2295 buf[12] = (inline_data_len >> 24) & 0xFF; 2296 buf[13] = (inline_data_len >> 16) & 0xFF; 2297 buf[14] = (inline_data_len >> 8) & 0xFF; 2298 buf[15] = inline_data_len & 0xFF; 2299 } 2300 2301 static void iscsi_xcopy_data(struct iscsi_data *data, 2302 IscsiLun *src, int64_t src_lba, 2303 IscsiLun *dst, int64_t dst_lba, 2304 uint16_t num_blocks) 2305 { 2306 uint8_t *buf; 2307 const int src_offset = XCOPY_DESC_OFFSET; 2308 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2309 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2310 2311 data->size = XCOPY_DESC_OFFSET + 2312 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2313 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2314 data->data = g_malloc0(data->size); 2315 buf = data->data; 2316 2317 /* Initialise the parameter list header */ 2318 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2319 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2320 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2321 0); 2322 2323 /* Initialise CSCD list with one src + one dst descriptor */ 2324 iscsi_populate_target_desc(&buf[src_offset], src); 2325 iscsi_populate_target_desc(&buf[dst_offset], dst); 2326 2327 /* Initialise one segment descriptor */ 2328 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2329 src_lba, dst_lba); 2330 } 2331 2332 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2333 BdrvChild *src, 2334 uint64_t src_offset, 2335 BdrvChild *dst, 2336 uint64_t dst_offset, 2337 uint64_t bytes, 2338 BdrvRequestFlags read_flags, 2339 BdrvRequestFlags write_flags) 2340 { 2341 IscsiLun *dst_lun = dst->bs->opaque; 2342 IscsiLun *src_lun; 2343 struct IscsiTask iscsi_task; 2344 struct iscsi_data data; 2345 int r = 0; 2346 int block_size; 2347 2348 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2349 return -ENOTSUP; 2350 } 2351 src_lun = src->bs->opaque; 2352 2353 if (!src_lun->dd || !dst_lun->dd) { 2354 return -ENOTSUP; 2355 } 2356 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2357 return -ENOTSUP; 2358 } 2359 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2360 return -ENOTSUP; 2361 } 2362 if (dst_lun->block_size != src_lun->block_size || 2363 !dst_lun->block_size) { 2364 return -ENOTSUP; 2365 } 2366 2367 block_size = dst_lun->block_size; 2368 if (bytes / block_size > 65535) { 2369 return -ENOTSUP; 2370 } 2371 2372 iscsi_xcopy_data(&data, 2373 src_lun, src_offset / block_size, 2374 dst_lun, dst_offset / block_size, 2375 bytes / block_size); 2376 2377 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2378 2379 qemu_mutex_lock(&dst_lun->mutex); 2380 iscsi_task.task = iscsi_xcopy_task(data.size); 2381 retry: 2382 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2383 iscsi_task.task, iscsi_co_generic_cb, 2384 &data, 2385 &iscsi_task) != 0) { 2386 r = -EIO; 2387 goto out_unlock; 2388 } 2389 2390 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2391 2392 if (iscsi_task.do_retry) { 2393 iscsi_task.complete = 0; 2394 goto retry; 2395 } 2396 2397 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2398 r = iscsi_task.err_code; 2399 goto out_unlock; 2400 } 2401 2402 out_unlock: 2403 2404 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2405 g_free(iscsi_task.task); 2406 qemu_mutex_unlock(&dst_lun->mutex); 2407 g_free(iscsi_task.err_str); 2408 return r; 2409 } 2410 2411 static QemuOptsList iscsi_create_opts = { 2412 .name = "iscsi-create-opts", 2413 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2414 .desc = { 2415 { 2416 .name = BLOCK_OPT_SIZE, 2417 .type = QEMU_OPT_SIZE, 2418 .help = "Virtual disk size" 2419 }, 2420 { /* end of list */ } 2421 } 2422 }; 2423 2424 static BlockDriver bdrv_iscsi = { 2425 .format_name = "iscsi", 2426 .protocol_name = "iscsi", 2427 2428 .instance_size = sizeof(IscsiLun), 2429 .bdrv_parse_filename = iscsi_parse_filename, 2430 .bdrv_file_open = iscsi_open, 2431 .bdrv_close = iscsi_close, 2432 .bdrv_co_create_opts = iscsi_co_create_opts, 2433 .create_opts = &iscsi_create_opts, 2434 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2435 .bdrv_reopen_commit = iscsi_reopen_commit, 2436 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2437 2438 .bdrv_getlength = iscsi_getlength, 2439 .bdrv_get_info = iscsi_get_info, 2440 .bdrv_co_truncate = iscsi_co_truncate, 2441 .bdrv_refresh_limits = iscsi_refresh_limits, 2442 2443 .bdrv_co_block_status = iscsi_co_block_status, 2444 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2445 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2446 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2447 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2448 .bdrv_co_readv = iscsi_co_readv, 2449 .bdrv_co_writev = iscsi_co_writev, 2450 .bdrv_co_flush_to_disk = iscsi_co_flush, 2451 2452 #ifdef __linux__ 2453 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2454 #endif 2455 2456 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2457 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2458 }; 2459 2460 #if LIBISCSI_API_VERSION >= (20160603) 2461 static BlockDriver bdrv_iser = { 2462 .format_name = "iser", 2463 .protocol_name = "iser", 2464 2465 .instance_size = sizeof(IscsiLun), 2466 .bdrv_parse_filename = iscsi_parse_filename, 2467 .bdrv_file_open = iscsi_open, 2468 .bdrv_close = iscsi_close, 2469 .bdrv_co_create_opts = iscsi_co_create_opts, 2470 .create_opts = &iscsi_create_opts, 2471 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2472 .bdrv_reopen_commit = iscsi_reopen_commit, 2473 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2474 2475 .bdrv_getlength = iscsi_getlength, 2476 .bdrv_get_info = iscsi_get_info, 2477 .bdrv_co_truncate = iscsi_co_truncate, 2478 .bdrv_refresh_limits = iscsi_refresh_limits, 2479 2480 .bdrv_co_block_status = iscsi_co_block_status, 2481 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2482 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2483 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2484 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2485 .bdrv_co_readv = iscsi_co_readv, 2486 .bdrv_co_writev = iscsi_co_writev, 2487 .bdrv_co_flush_to_disk = iscsi_co_flush, 2488 2489 #ifdef __linux__ 2490 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2491 #endif 2492 2493 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2494 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2495 }; 2496 #endif 2497 2498 static void iscsi_block_init(void) 2499 { 2500 bdrv_register(&bdrv_iscsi); 2501 #if LIBISCSI_API_VERSION >= (20160603) 2502 bdrv_register(&bdrv_iser); 2503 #endif 2504 } 2505 2506 block_init(iscsi_block_init); 2507