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-common.h" 32 #include "qemu/config-file.h" 33 #include "qemu/error-report.h" 34 #include "qemu/bitops.h" 35 #include "qemu/bitmap.h" 36 #include "block/block_int.h" 37 #include "block/qdict.h" 38 #include "scsi/constants.h" 39 #include "qemu/iov.h" 40 #include "qemu/module.h" 41 #include "qemu/option.h" 42 #include "qemu/uuid.h" 43 #include "sysemu/replay.h" 44 #include "qapi/error.h" 45 #include "qapi/qapi-commands-machine.h" 46 #include "qapi/qmp/qdict.h" 47 #include "qapi/qmp/qstring.h" 48 #include "crypto/secret.h" 49 #include "scsi/utils.h" 50 #include "trace.h" 51 52 /* Conflict between scsi/utils.h and libiscsi! :( */ 53 #define SCSI_XFER_NONE ISCSI_XFER_NONE 54 #include <iscsi/iscsi.h> 55 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */ 56 #include <iscsi/scsi-lowlevel.h> 57 #undef inline 58 #undef SCSI_XFER_NONE 59 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 60 61 #ifdef __linux__ 62 #include <scsi/sg.h> 63 #endif 64 65 typedef struct IscsiLun { 66 struct iscsi_context *iscsi; 67 AioContext *aio_context; 68 int lun; 69 enum scsi_inquiry_peripheral_device_type type; 70 int block_size; 71 uint64_t num_blocks; 72 int events; 73 QEMUTimer *nop_timer; 74 QEMUTimer *event_timer; 75 QemuMutex mutex; 76 struct scsi_inquiry_logical_block_provisioning lbp; 77 struct scsi_inquiry_block_limits bl; 78 struct scsi_inquiry_device_designator *dd; 79 unsigned char *zeroblock; 80 /* The allocmap tracks which clusters (pages) on the iSCSI target are 81 * allocated and which are not. In case a target returns zeros for 82 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 83 * of reading zeros over the wire if a read request falls within an 84 * unallocated block. As there are 3 possible states we need 2 bitmaps to 85 * track. allocmap_valid keeps track if QEMU's information about a page is 86 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 87 * valid information about a page the corresponding allocmap entry should be 88 * switched to unallocated as well to force a new lookup of the allocation 89 * status as lookups are generally skipped if a page is suspect to be 90 * allocated. If a iSCSI target is opened with cache.direct = on the 91 * allocmap_valid does not exist turning all cached information invalid so 92 * that a fresh lookup is made for any page even if allocmap entry returns 93 * it's unallocated. */ 94 unsigned long *allocmap; 95 unsigned long *allocmap_valid; 96 long allocmap_size; 97 int cluster_size; 98 bool use_16_for_rw; 99 bool write_protected; 100 bool lbpme; 101 bool lbprz; 102 bool dpofua; 103 bool has_write_same; 104 bool request_timed_out; 105 } IscsiLun; 106 107 typedef struct IscsiTask { 108 int status; 109 int complete; 110 int retries; 111 int do_retry; 112 struct scsi_task *task; 113 Coroutine *co; 114 IscsiLun *iscsilun; 115 QEMUTimer retry_timer; 116 int err_code; 117 char *err_str; 118 } IscsiTask; 119 120 typedef struct IscsiAIOCB { 121 BlockAIOCB common; 122 QEMUBH *bh; 123 IscsiLun *iscsilun; 124 struct scsi_task *task; 125 int status; 126 int64_t sector_num; 127 int nb_sectors; 128 int ret; 129 #ifdef __linux__ 130 sg_io_hdr_t *ioh; 131 #endif 132 bool cancelled; 133 } IscsiAIOCB; 134 135 /* libiscsi uses time_t so its enough to process events every second */ 136 #define EVENT_INTERVAL 1000 137 #define NOP_INTERVAL 5000 138 #define MAX_NOP_FAILURES 3 139 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 140 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 141 142 /* this threshold is a trade-off knob to choose between 143 * the potential additional overhead of an extra GET_LBA_STATUS request 144 * vs. unnecessarily reading a lot of zero sectors over the wire. 145 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 146 * sectors we check the allocation status of the area covered by the 147 * request first if the allocationmap indicates that the area might be 148 * unallocated. */ 149 #define ISCSI_CHECKALLOC_THRES 64 150 151 #ifdef __linux__ 152 153 static void 154 iscsi_bh_cb(void *p) 155 { 156 IscsiAIOCB *acb = p; 157 158 qemu_bh_delete(acb->bh); 159 160 acb->common.cb(acb->common.opaque, acb->status); 161 162 if (acb->task != NULL) { 163 scsi_free_scsi_task(acb->task); 164 acb->task = NULL; 165 } 166 167 qemu_aio_unref(acb); 168 } 169 170 static void 171 iscsi_schedule_bh(IscsiAIOCB *acb) 172 { 173 if (acb->bh) { 174 return; 175 } 176 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 177 qemu_bh_schedule(acb->bh); 178 } 179 180 #endif 181 182 static void iscsi_co_generic_bh_cb(void *opaque) 183 { 184 struct IscsiTask *iTask = opaque; 185 186 iTask->complete = 1; 187 aio_co_wake(iTask->co); 188 } 189 190 static void iscsi_retry_timer_expired(void *opaque) 191 { 192 struct IscsiTask *iTask = opaque; 193 iTask->complete = 1; 194 if (iTask->co) { 195 aio_co_wake(iTask->co); 196 } 197 } 198 199 static inline unsigned exp_random(double mean) 200 { 201 return -mean * log((double)rand() / RAND_MAX); 202 } 203 204 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 205 * libiscsi 1.10.0, together with other constants we need. Use it as 206 * a hint that we have to define them ourselves if needed, to keep the 207 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 208 * the test because SCSI_STATUS_* is an enum. 209 * 210 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 211 * an enum, check against the LIBISCSI_API_VERSION macro, which was 212 * introduced in 1.11.0. If it is present, there is no need to define 213 * anything. 214 */ 215 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 216 !defined(LIBISCSI_API_VERSION) 217 #define SCSI_STATUS_TASK_SET_FULL 0x28 218 #define SCSI_STATUS_TIMEOUT 0x0f000002 219 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 220 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 221 #endif 222 223 #ifndef LIBISCSI_API_VERSION 224 #define LIBISCSI_API_VERSION 20130701 225 #endif 226 227 static int iscsi_translate_sense(struct scsi_sense *sense) 228 { 229 return scsi_sense_to_errno(sense->key, 230 (sense->ascq & 0xFF00) >> 8, 231 sense->ascq & 0xFF); 232 } 233 234 /* Called (via iscsi_service) with QemuMutex held. */ 235 static void 236 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 237 void *command_data, void *opaque) 238 { 239 struct IscsiTask *iTask = opaque; 240 struct scsi_task *task = command_data; 241 242 iTask->status = status; 243 iTask->do_retry = 0; 244 iTask->err_code = 0; 245 iTask->task = task; 246 247 if (status != SCSI_STATUS_GOOD) { 248 iTask->err_code = -EIO; 249 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 250 if (status == SCSI_STATUS_BUSY || 251 status == SCSI_STATUS_TIMEOUT || 252 status == SCSI_STATUS_TASK_SET_FULL) { 253 unsigned retry_time = 254 exp_random(iscsi_retry_times[iTask->retries - 1]); 255 if (status == SCSI_STATUS_TIMEOUT) { 256 /* make sure the request is rescheduled AFTER the 257 * reconnect is initiated */ 258 retry_time = EVENT_INTERVAL * 2; 259 iTask->iscsilun->request_timed_out = true; 260 } 261 error_report("iSCSI Busy/TaskSetFull/TimeOut" 262 " (retry #%u in %u ms): %s", 263 iTask->retries, retry_time, 264 iscsi_get_error(iscsi)); 265 aio_timer_init(iTask->iscsilun->aio_context, 266 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 267 SCALE_MS, iscsi_retry_timer_expired, iTask); 268 timer_mod(&iTask->retry_timer, 269 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 270 iTask->do_retry = 1; 271 } else if (status == SCSI_STATUS_CHECK_CONDITION) { 272 int error = iscsi_translate_sense(&task->sense); 273 if (error == EAGAIN) { 274 error_report("iSCSI CheckCondition: %s", 275 iscsi_get_error(iscsi)); 276 iTask->do_retry = 1; 277 } else { 278 iTask->err_code = -error; 279 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 280 } 281 } 282 } 283 } 284 285 if (iTask->co) { 286 replay_bh_schedule_oneshot_event(iTask->iscsilun->aio_context, 287 iscsi_co_generic_bh_cb, iTask); 288 } else { 289 iTask->complete = 1; 290 } 291 } 292 293 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 294 { 295 *iTask = (struct IscsiTask) { 296 .co = qemu_coroutine_self(), 297 .iscsilun = iscsilun, 298 }; 299 } 300 301 #ifdef __linux__ 302 303 /* Called (via iscsi_service) with QemuMutex held. */ 304 static void 305 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 306 void *private_data) 307 { 308 IscsiAIOCB *acb = private_data; 309 310 /* If the command callback hasn't been called yet, drop the task */ 311 if (!acb->bh) { 312 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 313 iscsi_scsi_cancel_task(iscsi, acb->task); 314 } 315 316 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 317 } 318 319 static void 320 iscsi_aio_cancel(BlockAIOCB *blockacb) 321 { 322 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 323 IscsiLun *iscsilun = acb->iscsilun; 324 325 qemu_mutex_lock(&iscsilun->mutex); 326 327 /* If it was cancelled or completed already, our work is done here */ 328 if (acb->cancelled || acb->status != -EINPROGRESS) { 329 qemu_mutex_unlock(&iscsilun->mutex); 330 return; 331 } 332 333 acb->cancelled = true; 334 335 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 336 337 /* send a task mgmt call to the target to cancel the task on the target */ 338 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 339 iscsi_abort_task_cb, acb) < 0) { 340 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 341 } 342 343 qemu_mutex_unlock(&iscsilun->mutex); 344 } 345 346 static const AIOCBInfo iscsi_aiocb_info = { 347 .aiocb_size = sizeof(IscsiAIOCB), 348 .cancel_async = iscsi_aio_cancel, 349 }; 350 351 #endif 352 353 static void iscsi_process_read(void *arg); 354 static void iscsi_process_write(void *arg); 355 356 /* Called with QemuMutex held. */ 357 static void 358 iscsi_set_events(IscsiLun *iscsilun) 359 { 360 struct iscsi_context *iscsi = iscsilun->iscsi; 361 int ev = iscsi_which_events(iscsi); 362 363 if (ev != iscsilun->events) { 364 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 365 false, 366 (ev & POLLIN) ? iscsi_process_read : NULL, 367 (ev & POLLOUT) ? iscsi_process_write : NULL, 368 NULL, 369 iscsilun); 370 iscsilun->events = ev; 371 } 372 } 373 374 static void iscsi_timed_check_events(void *opaque) 375 { 376 IscsiLun *iscsilun = opaque; 377 378 qemu_mutex_lock(&iscsilun->mutex); 379 380 /* check for timed out requests */ 381 iscsi_service(iscsilun->iscsi, 0); 382 383 if (iscsilun->request_timed_out) { 384 iscsilun->request_timed_out = false; 385 iscsi_reconnect(iscsilun->iscsi); 386 } 387 388 /* newer versions of libiscsi may return zero events. Ensure we are able 389 * to return to service once this situation changes. */ 390 iscsi_set_events(iscsilun); 391 392 qemu_mutex_unlock(&iscsilun->mutex); 393 394 timer_mod(iscsilun->event_timer, 395 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 396 } 397 398 static void 399 iscsi_process_read(void *arg) 400 { 401 IscsiLun *iscsilun = arg; 402 struct iscsi_context *iscsi = iscsilun->iscsi; 403 404 qemu_mutex_lock(&iscsilun->mutex); 405 iscsi_service(iscsi, POLLIN); 406 iscsi_set_events(iscsilun); 407 qemu_mutex_unlock(&iscsilun->mutex); 408 } 409 410 static void 411 iscsi_process_write(void *arg) 412 { 413 IscsiLun *iscsilun = arg; 414 struct iscsi_context *iscsi = iscsilun->iscsi; 415 416 qemu_mutex_lock(&iscsilun->mutex); 417 iscsi_service(iscsi, POLLOUT); 418 iscsi_set_events(iscsilun); 419 qemu_mutex_unlock(&iscsilun->mutex); 420 } 421 422 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 423 { 424 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 425 } 426 427 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 428 { 429 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 430 } 431 432 static bool is_byte_request_lun_aligned(int64_t offset, int count, 433 IscsiLun *iscsilun) 434 { 435 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 436 error_report("iSCSI misaligned request: " 437 "iscsilun->block_size %u, offset %" PRIi64 438 ", count %d", 439 iscsilun->block_size, offset, count); 440 return false; 441 } 442 return true; 443 } 444 445 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 446 IscsiLun *iscsilun) 447 { 448 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 449 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 450 nb_sectors << BDRV_SECTOR_BITS, 451 iscsilun); 452 } 453 454 static void iscsi_allocmap_free(IscsiLun *iscsilun) 455 { 456 g_free(iscsilun->allocmap); 457 g_free(iscsilun->allocmap_valid); 458 iscsilun->allocmap = NULL; 459 iscsilun->allocmap_valid = NULL; 460 } 461 462 463 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 464 { 465 iscsi_allocmap_free(iscsilun); 466 467 assert(iscsilun->cluster_size); 468 iscsilun->allocmap_size = 469 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 470 iscsilun->cluster_size); 471 472 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 473 if (!iscsilun->allocmap) { 474 return -ENOMEM; 475 } 476 477 if (open_flags & BDRV_O_NOCACHE) { 478 /* when cache.direct = on all allocmap entries are 479 * treated as invalid to force a relookup of the block 480 * status on every read request */ 481 return 0; 482 } 483 484 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 485 if (!iscsilun->allocmap_valid) { 486 /* if we are under memory pressure free the allocmap as well */ 487 iscsi_allocmap_free(iscsilun); 488 return -ENOMEM; 489 } 490 491 return 0; 492 } 493 494 static void 495 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 496 int64_t bytes, bool allocated, bool valid) 497 { 498 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 499 500 if (iscsilun->allocmap == NULL) { 501 return; 502 } 503 /* expand to entirely contain all affected clusters */ 504 assert(iscsilun->cluster_size); 505 cl_num_expanded = offset / iscsilun->cluster_size; 506 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 507 iscsilun->cluster_size) - cl_num_expanded; 508 /* shrink to touch only completely contained clusters */ 509 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 510 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 511 if (allocated) { 512 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 513 } else { 514 if (nb_cls_shrunk > 0) { 515 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 516 } 517 } 518 519 if (iscsilun->allocmap_valid == NULL) { 520 return; 521 } 522 if (valid) { 523 if (nb_cls_shrunk > 0) { 524 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 525 } 526 } else { 527 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 528 nb_cls_expanded); 529 } 530 } 531 532 static void 533 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 534 int64_t bytes) 535 { 536 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 537 } 538 539 static void 540 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 541 int64_t bytes) 542 { 543 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 544 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 545 */ 546 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 547 } 548 549 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 550 int64_t bytes) 551 { 552 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 553 } 554 555 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 556 { 557 if (iscsilun->allocmap) { 558 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 559 } 560 if (iscsilun->allocmap_valid) { 561 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 562 } 563 } 564 565 static inline bool 566 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 567 int64_t bytes) 568 { 569 unsigned long size; 570 if (iscsilun->allocmap == NULL) { 571 return true; 572 } 573 assert(iscsilun->cluster_size); 574 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 575 return !(find_next_bit(iscsilun->allocmap, size, 576 offset / iscsilun->cluster_size) == size); 577 } 578 579 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 580 int64_t offset, int64_t bytes) 581 { 582 unsigned long size; 583 if (iscsilun->allocmap_valid == NULL) { 584 return false; 585 } 586 assert(iscsilun->cluster_size); 587 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 588 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 589 offset / iscsilun->cluster_size) == size); 590 } 591 592 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 593 IscsiLun *iscsilun) 594 { 595 while (!iTask->complete) { 596 iscsi_set_events(iscsilun); 597 qemu_mutex_unlock(&iscsilun->mutex); 598 qemu_coroutine_yield(); 599 qemu_mutex_lock(&iscsilun->mutex); 600 } 601 } 602 603 static int coroutine_fn 604 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 605 QEMUIOVector *iov, int flags) 606 { 607 IscsiLun *iscsilun = bs->opaque; 608 struct IscsiTask iTask; 609 uint64_t lba; 610 uint32_t num_sectors; 611 bool fua = flags & BDRV_REQ_FUA; 612 int r = 0; 613 614 if (fua) { 615 assert(iscsilun->dpofua); 616 } 617 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 618 return -EINVAL; 619 } 620 621 if (bs->bl.max_transfer) { 622 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 623 } 624 625 lba = sector_qemu2lun(sector_num, iscsilun); 626 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 627 iscsi_co_init_iscsitask(iscsilun, &iTask); 628 qemu_mutex_lock(&iscsilun->mutex); 629 retry: 630 if (iscsilun->use_16_for_rw) { 631 #if LIBISCSI_API_VERSION >= (20160603) 632 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 633 NULL, num_sectors * iscsilun->block_size, 634 iscsilun->block_size, 0, 0, fua, 0, 0, 635 iscsi_co_generic_cb, &iTask, 636 (struct scsi_iovec *)iov->iov, iov->niov); 637 } else { 638 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 639 NULL, num_sectors * iscsilun->block_size, 640 iscsilun->block_size, 0, 0, fua, 0, 0, 641 iscsi_co_generic_cb, &iTask, 642 (struct scsi_iovec *)iov->iov, iov->niov); 643 } 644 #else 645 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 646 NULL, num_sectors * iscsilun->block_size, 647 iscsilun->block_size, 0, 0, fua, 0, 0, 648 iscsi_co_generic_cb, &iTask); 649 } else { 650 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 651 NULL, num_sectors * iscsilun->block_size, 652 iscsilun->block_size, 0, 0, fua, 0, 0, 653 iscsi_co_generic_cb, &iTask); 654 } 655 #endif 656 if (iTask.task == NULL) { 657 qemu_mutex_unlock(&iscsilun->mutex); 658 return -ENOMEM; 659 } 660 #if LIBISCSI_API_VERSION < (20160603) 661 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 662 iov->niov); 663 #endif 664 iscsi_co_wait_for_task(&iTask, iscsilun); 665 666 if (iTask.task != NULL) { 667 scsi_free_scsi_task(iTask.task); 668 iTask.task = NULL; 669 } 670 671 if (iTask.do_retry) { 672 iTask.complete = 0; 673 goto retry; 674 } 675 676 if (iTask.status != SCSI_STATUS_GOOD) { 677 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 678 nb_sectors * BDRV_SECTOR_SIZE); 679 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 680 iTask.err_str); 681 r = iTask.err_code; 682 goto out_unlock; 683 } 684 685 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 686 nb_sectors * BDRV_SECTOR_SIZE); 687 688 out_unlock: 689 qemu_mutex_unlock(&iscsilun->mutex); 690 g_free(iTask.err_str); 691 return r; 692 } 693 694 695 696 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 697 bool want_zero, int64_t offset, 698 int64_t bytes, int64_t *pnum, 699 int64_t *map, 700 BlockDriverState **file) 701 { 702 IscsiLun *iscsilun = bs->opaque; 703 struct scsi_get_lba_status *lbas = NULL; 704 struct scsi_lba_status_descriptor *lbasd = NULL; 705 struct IscsiTask iTask; 706 uint64_t lba, max_bytes; 707 int ret; 708 709 iscsi_co_init_iscsitask(iscsilun, &iTask); 710 711 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 712 713 /* default to all sectors allocated */ 714 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 715 if (map) { 716 *map = offset; 717 } 718 *pnum = bytes; 719 720 /* LUN does not support logical block provisioning */ 721 if (!iscsilun->lbpme) { 722 goto out; 723 } 724 725 lba = offset / iscsilun->block_size; 726 max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size; 727 728 qemu_mutex_lock(&iscsilun->mutex); 729 retry: 730 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 731 lba, 8 + 16, iscsi_co_generic_cb, 732 &iTask) == NULL) { 733 ret = -ENOMEM; 734 goto out_unlock; 735 } 736 iscsi_co_wait_for_task(&iTask, iscsilun); 737 738 if (iTask.do_retry) { 739 if (iTask.task != NULL) { 740 scsi_free_scsi_task(iTask.task); 741 iTask.task = NULL; 742 } 743 iTask.complete = 0; 744 goto retry; 745 } 746 747 if (iTask.status != SCSI_STATUS_GOOD) { 748 /* in case the get_lba_status_callout fails (i.e. 749 * because the device is busy or the cmd is not 750 * supported) we pretend all blocks are allocated 751 * for backwards compatibility */ 752 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 753 lba, iTask.err_str); 754 goto out_unlock; 755 } 756 757 lbas = scsi_datain_unmarshall(iTask.task); 758 if (lbas == NULL || lbas->num_descriptors == 0) { 759 ret = -EIO; 760 goto out_unlock; 761 } 762 763 lbasd = &lbas->descriptors[0]; 764 765 if (lba != lbasd->lba) { 766 ret = -EIO; 767 goto out_unlock; 768 } 769 770 *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes); 771 772 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 773 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 774 ret &= ~BDRV_BLOCK_DATA; 775 if (iscsilun->lbprz) { 776 ret |= BDRV_BLOCK_ZERO; 777 } 778 } 779 780 if (ret & BDRV_BLOCK_ZERO) { 781 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 782 } else { 783 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 784 } 785 786 if (*pnum > bytes) { 787 *pnum = bytes; 788 } 789 out_unlock: 790 qemu_mutex_unlock(&iscsilun->mutex); 791 g_free(iTask.err_str); 792 out: 793 if (iTask.task != NULL) { 794 scsi_free_scsi_task(iTask.task); 795 } 796 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 797 *file = bs; 798 } 799 return ret; 800 } 801 802 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 803 int64_t sector_num, int nb_sectors, 804 QEMUIOVector *iov) 805 { 806 IscsiLun *iscsilun = bs->opaque; 807 struct IscsiTask iTask; 808 uint64_t lba; 809 uint32_t num_sectors; 810 int r = 0; 811 812 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 813 return -EINVAL; 814 } 815 816 if (bs->bl.max_transfer) { 817 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 818 } 819 820 /* if cache.direct is off and we have a valid entry in our allocation map 821 * we can skip checking the block status and directly return zeroes if 822 * the request falls within an unallocated area */ 823 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 824 nb_sectors * BDRV_SECTOR_SIZE) && 825 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 826 nb_sectors * BDRV_SECTOR_SIZE)) { 827 qemu_iovec_memset(iov, 0, 0x00, iov->size); 828 return 0; 829 } 830 831 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 832 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 833 nb_sectors * BDRV_SECTOR_SIZE) && 834 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 835 nb_sectors * BDRV_SECTOR_SIZE)) { 836 int64_t pnum; 837 /* check the block status from the beginning of the cluster 838 * containing the start sector */ 839 int64_t head; 840 int ret; 841 842 assert(iscsilun->cluster_size); 843 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 844 ret = iscsi_co_block_status(bs, true, 845 sector_num * BDRV_SECTOR_SIZE - head, 846 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 847 if (ret < 0) { 848 return ret; 849 } 850 /* if the whole request falls into an unallocated area we can avoid 851 * reading and directly return zeroes instead */ 852 if (ret & BDRV_BLOCK_ZERO && 853 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 854 qemu_iovec_memset(iov, 0, 0x00, iov->size); 855 return 0; 856 } 857 } 858 859 lba = sector_qemu2lun(sector_num, iscsilun); 860 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 861 862 iscsi_co_init_iscsitask(iscsilun, &iTask); 863 qemu_mutex_lock(&iscsilun->mutex); 864 retry: 865 if (iscsilun->use_16_for_rw) { 866 #if LIBISCSI_API_VERSION >= (20160603) 867 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 868 num_sectors * iscsilun->block_size, 869 iscsilun->block_size, 0, 0, 0, 0, 0, 870 iscsi_co_generic_cb, &iTask, 871 (struct scsi_iovec *)iov->iov, iov->niov); 872 } else { 873 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 874 num_sectors * iscsilun->block_size, 875 iscsilun->block_size, 876 0, 0, 0, 0, 0, 877 iscsi_co_generic_cb, &iTask, 878 (struct scsi_iovec *)iov->iov, iov->niov); 879 } 880 #else 881 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 882 num_sectors * iscsilun->block_size, 883 iscsilun->block_size, 0, 0, 0, 0, 0, 884 iscsi_co_generic_cb, &iTask); 885 } else { 886 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 887 num_sectors * iscsilun->block_size, 888 iscsilun->block_size, 889 0, 0, 0, 0, 0, 890 iscsi_co_generic_cb, &iTask); 891 } 892 #endif 893 if (iTask.task == NULL) { 894 qemu_mutex_unlock(&iscsilun->mutex); 895 return -ENOMEM; 896 } 897 #if LIBISCSI_API_VERSION < (20160603) 898 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 899 #endif 900 901 iscsi_co_wait_for_task(&iTask, iscsilun); 902 if (iTask.task != NULL) { 903 scsi_free_scsi_task(iTask.task); 904 iTask.task = NULL; 905 } 906 907 if (iTask.do_retry) { 908 iTask.complete = 0; 909 goto retry; 910 } 911 912 if (iTask.status != SCSI_STATUS_GOOD) { 913 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 914 lba, iTask.err_str); 915 r = iTask.err_code; 916 } 917 918 qemu_mutex_unlock(&iscsilun->mutex); 919 g_free(iTask.err_str); 920 return r; 921 } 922 923 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 924 { 925 IscsiLun *iscsilun = bs->opaque; 926 struct IscsiTask iTask; 927 int r = 0; 928 929 iscsi_co_init_iscsitask(iscsilun, &iTask); 930 qemu_mutex_lock(&iscsilun->mutex); 931 retry: 932 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 933 0, iscsi_co_generic_cb, &iTask) == NULL) { 934 qemu_mutex_unlock(&iscsilun->mutex); 935 return -ENOMEM; 936 } 937 938 iscsi_co_wait_for_task(&iTask, iscsilun); 939 940 if (iTask.task != NULL) { 941 scsi_free_scsi_task(iTask.task); 942 iTask.task = NULL; 943 } 944 945 if (iTask.do_retry) { 946 iTask.complete = 0; 947 goto retry; 948 } 949 950 if (iTask.status != SCSI_STATUS_GOOD) { 951 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 952 r = iTask.err_code; 953 } 954 955 qemu_mutex_unlock(&iscsilun->mutex); 956 g_free(iTask.err_str); 957 return r; 958 } 959 960 #ifdef __linux__ 961 /* Called (via iscsi_service) with QemuMutex held. */ 962 static void 963 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 964 void *command_data, void *opaque) 965 { 966 IscsiAIOCB *acb = opaque; 967 968 if (status == SCSI_STATUS_CANCELLED) { 969 if (!acb->bh) { 970 acb->status = -ECANCELED; 971 iscsi_schedule_bh(acb); 972 } 973 return; 974 } 975 976 acb->status = 0; 977 if (status < 0) { 978 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 979 iscsi_get_error(iscsi)); 980 acb->status = -iscsi_translate_sense(&acb->task->sense); 981 } 982 983 acb->ioh->driver_status = 0; 984 acb->ioh->host_status = 0; 985 acb->ioh->resid = 0; 986 acb->ioh->status = status; 987 988 #define SG_ERR_DRIVER_SENSE 0x08 989 990 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 991 int ss; 992 993 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 994 995 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 996 ss = MIN(acb->ioh->mx_sb_len, acb->ioh->sb_len_wr); 997 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 998 } 999 1000 iscsi_schedule_bh(acb); 1001 } 1002 1003 static void iscsi_ioctl_bh_completion(void *opaque) 1004 { 1005 IscsiAIOCB *acb = opaque; 1006 1007 qemu_bh_delete(acb->bh); 1008 acb->common.cb(acb->common.opaque, acb->ret); 1009 qemu_aio_unref(acb); 1010 } 1011 1012 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 1013 { 1014 BlockDriverState *bs = acb->common.bs; 1015 IscsiLun *iscsilun = bs->opaque; 1016 int ret = 0; 1017 1018 switch (req) { 1019 case SG_GET_VERSION_NUM: 1020 *(int *)buf = 30000; 1021 break; 1022 case SG_GET_SCSI_ID: 1023 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 1024 break; 1025 default: 1026 ret = -EINVAL; 1027 } 1028 assert(!acb->bh); 1029 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 1030 iscsi_ioctl_bh_completion, acb); 1031 acb->ret = ret; 1032 qemu_bh_schedule(acb->bh); 1033 } 1034 1035 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1036 unsigned long int req, void *buf, 1037 BlockCompletionFunc *cb, void *opaque) 1038 { 1039 IscsiLun *iscsilun = bs->opaque; 1040 struct iscsi_context *iscsi = iscsilun->iscsi; 1041 struct iscsi_data data; 1042 IscsiAIOCB *acb; 1043 1044 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1045 1046 acb->iscsilun = iscsilun; 1047 acb->bh = NULL; 1048 acb->status = -EINPROGRESS; 1049 acb->ioh = buf; 1050 acb->cancelled = false; 1051 1052 if (req != SG_IO) { 1053 iscsi_ioctl_handle_emulated(acb, req, buf); 1054 return &acb->common; 1055 } 1056 1057 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1058 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1059 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1060 qemu_aio_unref(acb); 1061 return NULL; 1062 } 1063 1064 acb->task = malloc(sizeof(struct scsi_task)); 1065 if (acb->task == NULL) { 1066 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1067 iscsi_get_error(iscsi)); 1068 qemu_aio_unref(acb); 1069 return NULL; 1070 } 1071 memset(acb->task, 0, sizeof(struct scsi_task)); 1072 1073 switch (acb->ioh->dxfer_direction) { 1074 case SG_DXFER_TO_DEV: 1075 acb->task->xfer_dir = SCSI_XFER_WRITE; 1076 break; 1077 case SG_DXFER_FROM_DEV: 1078 acb->task->xfer_dir = SCSI_XFER_READ; 1079 break; 1080 default: 1081 acb->task->xfer_dir = SCSI_XFER_NONE; 1082 break; 1083 } 1084 1085 acb->task->cdb_size = acb->ioh->cmd_len; 1086 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1087 acb->task->expxferlen = acb->ioh->dxfer_len; 1088 1089 data.size = 0; 1090 qemu_mutex_lock(&iscsilun->mutex); 1091 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1092 if (acb->ioh->iovec_count == 0) { 1093 data.data = acb->ioh->dxferp; 1094 data.size = acb->ioh->dxfer_len; 1095 } else { 1096 scsi_task_set_iov_out(acb->task, 1097 (struct scsi_iovec *) acb->ioh->dxferp, 1098 acb->ioh->iovec_count); 1099 } 1100 } 1101 1102 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1103 iscsi_aio_ioctl_cb, 1104 (data.size > 0) ? &data : NULL, 1105 acb) != 0) { 1106 qemu_mutex_unlock(&iscsilun->mutex); 1107 scsi_free_scsi_task(acb->task); 1108 qemu_aio_unref(acb); 1109 return NULL; 1110 } 1111 1112 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1113 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1114 if (acb->ioh->iovec_count == 0) { 1115 scsi_task_add_data_in_buffer(acb->task, 1116 acb->ioh->dxfer_len, 1117 acb->ioh->dxferp); 1118 } else { 1119 scsi_task_set_iov_in(acb->task, 1120 (struct scsi_iovec *) acb->ioh->dxferp, 1121 acb->ioh->iovec_count); 1122 } 1123 } 1124 1125 iscsi_set_events(iscsilun); 1126 qemu_mutex_unlock(&iscsilun->mutex); 1127 1128 return &acb->common; 1129 } 1130 1131 #endif 1132 1133 static int64_t 1134 iscsi_getlength(BlockDriverState *bs) 1135 { 1136 IscsiLun *iscsilun = bs->opaque; 1137 int64_t len; 1138 1139 len = iscsilun->num_blocks; 1140 len *= iscsilun->block_size; 1141 1142 return len; 1143 } 1144 1145 static int 1146 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1147 { 1148 IscsiLun *iscsilun = bs->opaque; 1149 struct IscsiTask iTask; 1150 struct unmap_list list; 1151 int r = 0; 1152 1153 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1154 return -ENOTSUP; 1155 } 1156 1157 if (!iscsilun->lbp.lbpu) { 1158 /* UNMAP is not supported by the target */ 1159 return 0; 1160 } 1161 1162 list.lba = offset / iscsilun->block_size; 1163 list.num = bytes / iscsilun->block_size; 1164 1165 iscsi_co_init_iscsitask(iscsilun, &iTask); 1166 qemu_mutex_lock(&iscsilun->mutex); 1167 retry: 1168 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1169 iscsi_co_generic_cb, &iTask) == NULL) { 1170 r = -ENOMEM; 1171 goto out_unlock; 1172 } 1173 1174 iscsi_co_wait_for_task(&iTask, iscsilun); 1175 1176 if (iTask.task != NULL) { 1177 scsi_free_scsi_task(iTask.task); 1178 iTask.task = NULL; 1179 } 1180 1181 if (iTask.do_retry) { 1182 iTask.complete = 0; 1183 goto retry; 1184 } 1185 1186 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1187 1188 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1189 /* the target might fail with a check condition if it 1190 is not happy with the alignment of the UNMAP request 1191 we silently fail in this case */ 1192 goto out_unlock; 1193 } 1194 1195 if (iTask.status != SCSI_STATUS_GOOD) { 1196 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1197 list.lba, iTask.err_str); 1198 r = iTask.err_code; 1199 goto out_unlock; 1200 } 1201 1202 out_unlock: 1203 qemu_mutex_unlock(&iscsilun->mutex); 1204 g_free(iTask.err_str); 1205 return r; 1206 } 1207 1208 static int 1209 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1210 int bytes, BdrvRequestFlags flags) 1211 { 1212 IscsiLun *iscsilun = bs->opaque; 1213 struct IscsiTask iTask; 1214 uint64_t lba; 1215 uint32_t nb_blocks; 1216 bool use_16_for_ws = iscsilun->use_16_for_rw; 1217 int r = 0; 1218 1219 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1220 return -ENOTSUP; 1221 } 1222 1223 if (flags & BDRV_REQ_MAY_UNMAP) { 1224 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1225 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1226 use_16_for_ws = true; 1227 } 1228 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1229 /* WRITESAME16 with UNMAP is not supported by the target, 1230 * fall back and try WRITESAME10/16 without UNMAP */ 1231 flags &= ~BDRV_REQ_MAY_UNMAP; 1232 use_16_for_ws = iscsilun->use_16_for_rw; 1233 } 1234 } 1235 1236 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1237 /* WRITESAME without UNMAP is not supported by the target */ 1238 return -ENOTSUP; 1239 } 1240 1241 lba = offset / iscsilun->block_size; 1242 nb_blocks = bytes / iscsilun->block_size; 1243 1244 if (iscsilun->zeroblock == NULL) { 1245 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1246 if (iscsilun->zeroblock == NULL) { 1247 return -ENOMEM; 1248 } 1249 } 1250 1251 qemu_mutex_lock(&iscsilun->mutex); 1252 iscsi_co_init_iscsitask(iscsilun, &iTask); 1253 retry: 1254 if (use_16_for_ws) { 1255 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1256 iscsilun->zeroblock, iscsilun->block_size, 1257 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1258 0, 0, iscsi_co_generic_cb, &iTask); 1259 } else { 1260 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1261 iscsilun->zeroblock, iscsilun->block_size, 1262 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1263 0, 0, iscsi_co_generic_cb, &iTask); 1264 } 1265 if (iTask.task == NULL) { 1266 qemu_mutex_unlock(&iscsilun->mutex); 1267 return -ENOMEM; 1268 } 1269 1270 iscsi_co_wait_for_task(&iTask, iscsilun); 1271 1272 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1273 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1274 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1275 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1276 /* WRITE SAME is not supported by the target */ 1277 iscsilun->has_write_same = false; 1278 scsi_free_scsi_task(iTask.task); 1279 r = -ENOTSUP; 1280 goto out_unlock; 1281 } 1282 1283 if (iTask.task != NULL) { 1284 scsi_free_scsi_task(iTask.task); 1285 iTask.task = NULL; 1286 } 1287 1288 if (iTask.do_retry) { 1289 iTask.complete = 0; 1290 goto retry; 1291 } 1292 1293 if (iTask.status != SCSI_STATUS_GOOD) { 1294 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1295 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1296 lba, iTask.err_str); 1297 r = iTask.err_code; 1298 goto out_unlock; 1299 } 1300 1301 if (flags & BDRV_REQ_MAY_UNMAP) { 1302 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1303 } else { 1304 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1305 } 1306 1307 out_unlock: 1308 qemu_mutex_unlock(&iscsilun->mutex); 1309 g_free(iTask.err_str); 1310 return r; 1311 } 1312 1313 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1314 Error **errp) 1315 { 1316 const char *user = NULL; 1317 const char *password = NULL; 1318 const char *secretid; 1319 char *secret = NULL; 1320 1321 user = qemu_opt_get(opts, "user"); 1322 if (!user) { 1323 return; 1324 } 1325 1326 secretid = qemu_opt_get(opts, "password-secret"); 1327 password = qemu_opt_get(opts, "password"); 1328 if (secretid && password) { 1329 error_setg(errp, "'password' and 'password-secret' properties are " 1330 "mutually exclusive"); 1331 return; 1332 } 1333 if (secretid) { 1334 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1335 if (!secret) { 1336 return; 1337 } 1338 password = secret; 1339 } else if (!password) { 1340 error_setg(errp, "CHAP username specified but no password was given"); 1341 return; 1342 } 1343 1344 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1345 error_setg(errp, "Failed to set initiator username and password"); 1346 } 1347 1348 g_free(secret); 1349 } 1350 1351 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1352 Error **errp) 1353 { 1354 const char *digest = NULL; 1355 1356 digest = qemu_opt_get(opts, "header-digest"); 1357 if (!digest) { 1358 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1359 } else if (!strcmp(digest, "crc32c")) { 1360 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1361 } else if (!strcmp(digest, "none")) { 1362 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1363 } else if (!strcmp(digest, "crc32c-none")) { 1364 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1365 } else if (!strcmp(digest, "none-crc32c")) { 1366 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1367 } else { 1368 error_setg(errp, "Invalid header-digest setting : %s", digest); 1369 } 1370 } 1371 1372 static char *get_initiator_name(QemuOpts *opts) 1373 { 1374 const char *name; 1375 char *iscsi_name; 1376 UuidInfo *uuid_info; 1377 1378 name = qemu_opt_get(opts, "initiator-name"); 1379 if (name) { 1380 return g_strdup(name); 1381 } 1382 1383 uuid_info = qmp_query_uuid(NULL); 1384 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1385 name = qemu_get_vm_name(); 1386 } else { 1387 name = uuid_info->UUID; 1388 } 1389 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1390 name ? ":" : "", name ? name : ""); 1391 qapi_free_UuidInfo(uuid_info); 1392 return iscsi_name; 1393 } 1394 1395 static void iscsi_nop_timed_event(void *opaque) 1396 { 1397 IscsiLun *iscsilun = opaque; 1398 1399 QEMU_LOCK_GUARD(&iscsilun->mutex); 1400 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1401 error_report("iSCSI: NOP timeout. Reconnecting..."); 1402 iscsilun->request_timed_out = true; 1403 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1404 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1405 return; 1406 } 1407 1408 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1409 iscsi_set_events(iscsilun); 1410 } 1411 1412 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1413 { 1414 struct scsi_task *task = NULL; 1415 struct scsi_readcapacity10 *rc10 = NULL; 1416 struct scsi_readcapacity16 *rc16 = NULL; 1417 int retries = ISCSI_CMD_RETRIES; 1418 1419 do { 1420 if (task != NULL) { 1421 scsi_free_scsi_task(task); 1422 task = NULL; 1423 } 1424 1425 switch (iscsilun->type) { 1426 case TYPE_DISK: 1427 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1428 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1429 rc16 = scsi_datain_unmarshall(task); 1430 if (rc16 == NULL) { 1431 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1432 } else { 1433 iscsilun->block_size = rc16->block_length; 1434 iscsilun->num_blocks = rc16->returned_lba + 1; 1435 iscsilun->lbpme = !!rc16->lbpme; 1436 iscsilun->lbprz = !!rc16->lbprz; 1437 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1438 } 1439 break; 1440 } 1441 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1442 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1443 break; 1444 } 1445 /* Fall through and try READ CAPACITY(10) instead. */ 1446 case TYPE_ROM: 1447 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1448 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1449 rc10 = scsi_datain_unmarshall(task); 1450 if (rc10 == NULL) { 1451 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1452 } else { 1453 iscsilun->block_size = rc10->block_size; 1454 if (rc10->lba == 0) { 1455 /* blank disk loaded */ 1456 iscsilun->num_blocks = 0; 1457 } else { 1458 iscsilun->num_blocks = rc10->lba + 1; 1459 } 1460 } 1461 } 1462 break; 1463 default: 1464 return; 1465 } 1466 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1467 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1468 && retries-- > 0); 1469 1470 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1471 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1472 } else if (!iscsilun->block_size || 1473 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1474 error_setg(errp, "iSCSI: the target returned an invalid " 1475 "block size of %d.", iscsilun->block_size); 1476 } 1477 if (task) { 1478 scsi_free_scsi_task(task); 1479 } 1480 } 1481 1482 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1483 int evpd, int pc, void **inq, Error **errp) 1484 { 1485 int full_size; 1486 struct scsi_task *task = NULL; 1487 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1488 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1489 goto fail; 1490 } 1491 full_size = scsi_datain_getfullsize(task); 1492 if (full_size > task->datain.size) { 1493 scsi_free_scsi_task(task); 1494 1495 /* we need more data for the full list */ 1496 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1497 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1498 goto fail; 1499 } 1500 } 1501 1502 *inq = scsi_datain_unmarshall(task); 1503 if (*inq == NULL) { 1504 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1505 goto fail_with_err; 1506 } 1507 1508 return task; 1509 1510 fail: 1511 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1512 iscsi_get_error(iscsi)); 1513 fail_with_err: 1514 if (task != NULL) { 1515 scsi_free_scsi_task(task); 1516 } 1517 return NULL; 1518 } 1519 1520 static void iscsi_detach_aio_context(BlockDriverState *bs) 1521 { 1522 IscsiLun *iscsilun = bs->opaque; 1523 1524 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1525 false, NULL, NULL, NULL, NULL); 1526 iscsilun->events = 0; 1527 1528 if (iscsilun->nop_timer) { 1529 timer_del(iscsilun->nop_timer); 1530 timer_free(iscsilun->nop_timer); 1531 iscsilun->nop_timer = NULL; 1532 } 1533 if (iscsilun->event_timer) { 1534 timer_del(iscsilun->event_timer); 1535 timer_free(iscsilun->event_timer); 1536 iscsilun->event_timer = NULL; 1537 } 1538 } 1539 1540 static void iscsi_attach_aio_context(BlockDriverState *bs, 1541 AioContext *new_context) 1542 { 1543 IscsiLun *iscsilun = bs->opaque; 1544 1545 iscsilun->aio_context = new_context; 1546 iscsi_set_events(iscsilun); 1547 1548 /* Set up a timer for sending out iSCSI NOPs */ 1549 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1550 QEMU_CLOCK_REALTIME, SCALE_MS, 1551 iscsi_nop_timed_event, iscsilun); 1552 timer_mod(iscsilun->nop_timer, 1553 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1554 1555 /* Set up a timer for periodic calls to iscsi_set_events and to 1556 * scan for command timeout */ 1557 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1558 QEMU_CLOCK_REALTIME, SCALE_MS, 1559 iscsi_timed_check_events, iscsilun); 1560 timer_mod(iscsilun->event_timer, 1561 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1562 } 1563 1564 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1565 { 1566 struct scsi_task *task; 1567 struct scsi_mode_sense *ms = NULL; 1568 iscsilun->write_protected = false; 1569 iscsilun->dpofua = false; 1570 1571 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1572 1, SCSI_MODESENSE_PC_CURRENT, 1573 0x3F, 0, 255); 1574 if (task == NULL) { 1575 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1576 iscsi_get_error(iscsilun->iscsi)); 1577 goto out; 1578 } 1579 1580 if (task->status != SCSI_STATUS_GOOD) { 1581 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1582 goto out; 1583 } 1584 ms = scsi_datain_unmarshall(task); 1585 if (!ms) { 1586 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1587 iscsi_get_error(iscsilun->iscsi)); 1588 goto out; 1589 } 1590 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1591 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1592 1593 out: 1594 if (task) { 1595 scsi_free_scsi_task(task); 1596 } 1597 } 1598 1599 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1600 { 1601 QemuOptsList *list; 1602 QemuOpts *opts; 1603 const char *user, *password, *password_secret, *initiator_name, 1604 *header_digest, *timeout; 1605 1606 list = qemu_find_opts("iscsi"); 1607 if (!list) { 1608 return; 1609 } 1610 1611 opts = qemu_opts_find(list, target); 1612 if (opts == NULL) { 1613 opts = QTAILQ_FIRST(&list->head); 1614 if (!opts) { 1615 return; 1616 } 1617 } 1618 1619 user = qemu_opt_get(opts, "user"); 1620 if (user) { 1621 qdict_set_default_str(options, "user", user); 1622 } 1623 1624 password = qemu_opt_get(opts, "password"); 1625 if (password) { 1626 qdict_set_default_str(options, "password", password); 1627 } 1628 1629 password_secret = qemu_opt_get(opts, "password-secret"); 1630 if (password_secret) { 1631 qdict_set_default_str(options, "password-secret", password_secret); 1632 } 1633 1634 initiator_name = qemu_opt_get(opts, "initiator-name"); 1635 if (initiator_name) { 1636 qdict_set_default_str(options, "initiator-name", initiator_name); 1637 } 1638 1639 header_digest = qemu_opt_get(opts, "header-digest"); 1640 if (header_digest) { 1641 /* -iscsi takes upper case values, but QAPI only supports lower case 1642 * enum constant names, so we have to convert here. */ 1643 char *qapi_value = g_ascii_strdown(header_digest, -1); 1644 qdict_set_default_str(options, "header-digest", qapi_value); 1645 g_free(qapi_value); 1646 } 1647 1648 timeout = qemu_opt_get(opts, "timeout"); 1649 if (timeout) { 1650 qdict_set_default_str(options, "timeout", timeout); 1651 } 1652 } 1653 1654 /* 1655 * We support iscsi url's on the form 1656 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1657 */ 1658 static void iscsi_parse_filename(const char *filename, QDict *options, 1659 Error **errp) 1660 { 1661 struct iscsi_url *iscsi_url; 1662 const char *transport_name; 1663 char *lun_str; 1664 1665 iscsi_url = iscsi_parse_full_url(NULL, filename); 1666 if (iscsi_url == NULL) { 1667 error_setg(errp, "Failed to parse URL : %s", filename); 1668 return; 1669 } 1670 1671 #if LIBISCSI_API_VERSION >= (20160603) 1672 switch (iscsi_url->transport) { 1673 case TCP_TRANSPORT: 1674 transport_name = "tcp"; 1675 break; 1676 case ISER_TRANSPORT: 1677 transport_name = "iser"; 1678 break; 1679 default: 1680 error_setg(errp, "Unknown transport type (%d)", 1681 iscsi_url->transport); 1682 return; 1683 } 1684 #else 1685 transport_name = "tcp"; 1686 #endif 1687 1688 qdict_set_default_str(options, "transport", transport_name); 1689 qdict_set_default_str(options, "portal", iscsi_url->portal); 1690 qdict_set_default_str(options, "target", iscsi_url->target); 1691 1692 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1693 qdict_set_default_str(options, "lun", lun_str); 1694 g_free(lun_str); 1695 1696 /* User/password from -iscsi take precedence over those from the URL */ 1697 iscsi_parse_iscsi_option(iscsi_url->target, options); 1698 1699 if (iscsi_url->user[0] != '\0') { 1700 qdict_set_default_str(options, "user", iscsi_url->user); 1701 qdict_set_default_str(options, "password", iscsi_url->passwd); 1702 } 1703 1704 iscsi_destroy_url(iscsi_url); 1705 } 1706 1707 static QemuOptsList runtime_opts = { 1708 .name = "iscsi", 1709 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1710 .desc = { 1711 { 1712 .name = "transport", 1713 .type = QEMU_OPT_STRING, 1714 }, 1715 { 1716 .name = "portal", 1717 .type = QEMU_OPT_STRING, 1718 }, 1719 { 1720 .name = "target", 1721 .type = QEMU_OPT_STRING, 1722 }, 1723 { 1724 .name = "user", 1725 .type = QEMU_OPT_STRING, 1726 }, 1727 { 1728 .name = "password", 1729 .type = QEMU_OPT_STRING, 1730 }, 1731 { 1732 .name = "password-secret", 1733 .type = QEMU_OPT_STRING, 1734 }, 1735 { 1736 .name = "lun", 1737 .type = QEMU_OPT_NUMBER, 1738 }, 1739 { 1740 .name = "initiator-name", 1741 .type = QEMU_OPT_STRING, 1742 }, 1743 { 1744 .name = "header-digest", 1745 .type = QEMU_OPT_STRING, 1746 }, 1747 { 1748 .name = "timeout", 1749 .type = QEMU_OPT_NUMBER, 1750 }, 1751 { /* end of list */ } 1752 }, 1753 }; 1754 1755 static void iscsi_save_designator(IscsiLun *lun, 1756 struct scsi_inquiry_device_identification *inq_di) 1757 { 1758 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1759 1760 for (desig = inq_di->designators; desig; desig = desig->next) { 1761 if (desig->association || 1762 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1763 continue; 1764 } 1765 /* NAA works better than T10 vendor ID based designator. */ 1766 if (!copy || copy->designator_type < desig->designator_type) { 1767 copy = desig; 1768 } 1769 } 1770 if (copy) { 1771 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1772 *lun->dd = *copy; 1773 lun->dd->next = NULL; 1774 lun->dd->designator = g_malloc(copy->designator_length); 1775 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1776 } 1777 } 1778 1779 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1780 Error **errp) 1781 { 1782 IscsiLun *iscsilun = bs->opaque; 1783 struct iscsi_context *iscsi = NULL; 1784 struct scsi_task *task = NULL; 1785 struct scsi_inquiry_standard *inq = NULL; 1786 struct scsi_inquiry_supported_pages *inq_vpd; 1787 char *initiator_name = NULL; 1788 QemuOpts *opts; 1789 Error *local_err = NULL; 1790 const char *transport_name, *portal, *target; 1791 #if LIBISCSI_API_VERSION >= (20160603) 1792 enum iscsi_transport_type transport; 1793 #endif 1794 int i, ret = 0, timeout = 0, lun; 1795 1796 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1797 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 1798 ret = -EINVAL; 1799 goto out; 1800 } 1801 1802 transport_name = qemu_opt_get(opts, "transport"); 1803 portal = qemu_opt_get(opts, "portal"); 1804 target = qemu_opt_get(opts, "target"); 1805 lun = qemu_opt_get_number(opts, "lun", 0); 1806 1807 if (!transport_name || !portal || !target) { 1808 error_setg(errp, "Need all of transport, portal and target options"); 1809 ret = -EINVAL; 1810 goto out; 1811 } 1812 1813 if (!strcmp(transport_name, "tcp")) { 1814 #if LIBISCSI_API_VERSION >= (20160603) 1815 transport = TCP_TRANSPORT; 1816 } else if (!strcmp(transport_name, "iser")) { 1817 transport = ISER_TRANSPORT; 1818 #else 1819 /* TCP is what older libiscsi versions always use */ 1820 #endif 1821 } else { 1822 error_setg(errp, "Unknown transport: %s", transport_name); 1823 ret = -EINVAL; 1824 goto out; 1825 } 1826 1827 memset(iscsilun, 0, sizeof(IscsiLun)); 1828 1829 initiator_name = get_initiator_name(opts); 1830 1831 iscsi = iscsi_create_context(initiator_name); 1832 if (iscsi == NULL) { 1833 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1834 ret = -ENOMEM; 1835 goto out; 1836 } 1837 #if LIBISCSI_API_VERSION >= (20160603) 1838 if (iscsi_init_transport(iscsi, transport)) { 1839 error_setg(errp, ("Error initializing transport.")); 1840 ret = -EINVAL; 1841 goto out; 1842 } 1843 #endif 1844 if (iscsi_set_targetname(iscsi, target)) { 1845 error_setg(errp, "iSCSI: Failed to set target name."); 1846 ret = -EINVAL; 1847 goto out; 1848 } 1849 1850 /* check if we got CHAP username/password via the options */ 1851 apply_chap(iscsi, opts, &local_err); 1852 if (local_err != NULL) { 1853 error_propagate(errp, local_err); 1854 ret = -EINVAL; 1855 goto out; 1856 } 1857 1858 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1859 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1860 ret = -EINVAL; 1861 goto out; 1862 } 1863 1864 /* check if we got HEADER_DIGEST via the options */ 1865 apply_header_digest(iscsi, opts, &local_err); 1866 if (local_err != NULL) { 1867 error_propagate(errp, local_err); 1868 ret = -EINVAL; 1869 goto out; 1870 } 1871 1872 /* timeout handling is broken in libiscsi before 1.15.0 */ 1873 timeout = qemu_opt_get_number(opts, "timeout", 0); 1874 #if LIBISCSI_API_VERSION >= 20150621 1875 iscsi_set_timeout(iscsi, timeout); 1876 #else 1877 if (timeout) { 1878 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1879 } 1880 #endif 1881 1882 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1883 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1884 iscsi_get_error(iscsi)); 1885 ret = -EINVAL; 1886 goto out; 1887 } 1888 1889 iscsilun->iscsi = iscsi; 1890 iscsilun->aio_context = bdrv_get_aio_context(bs); 1891 iscsilun->lun = lun; 1892 iscsilun->has_write_same = true; 1893 1894 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1895 (void **) &inq, errp); 1896 if (task == NULL) { 1897 ret = -EINVAL; 1898 goto out; 1899 } 1900 iscsilun->type = inq->periperal_device_type; 1901 scsi_free_scsi_task(task); 1902 task = NULL; 1903 1904 iscsi_modesense_sync(iscsilun); 1905 if (iscsilun->dpofua) { 1906 bs->supported_write_flags = BDRV_REQ_FUA; 1907 } 1908 1909 /* Check the write protect flag of the LUN if we want to write */ 1910 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1911 iscsilun->write_protected) { 1912 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1913 if (ret < 0) { 1914 goto out; 1915 } 1916 flags &= ~BDRV_O_RDWR; 1917 } 1918 1919 iscsi_readcapacity_sync(iscsilun, &local_err); 1920 if (local_err != NULL) { 1921 error_propagate(errp, local_err); 1922 ret = -EINVAL; 1923 goto out; 1924 } 1925 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1926 1927 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1928 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1929 * will try to read from the device to guess the image format. 1930 */ 1931 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1932 bs->sg = true; 1933 } 1934 1935 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1936 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1937 (void **) &inq_vpd, errp); 1938 if (task == NULL) { 1939 ret = -EINVAL; 1940 goto out; 1941 } 1942 for (i = 0; i < inq_vpd->num_pages; i++) { 1943 struct scsi_task *inq_task; 1944 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1945 struct scsi_inquiry_block_limits *inq_bl; 1946 struct scsi_inquiry_device_identification *inq_di; 1947 switch (inq_vpd->pages[i]) { 1948 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1949 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1950 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1951 (void **) &inq_lbp, errp); 1952 if (inq_task == NULL) { 1953 ret = -EINVAL; 1954 goto out; 1955 } 1956 memcpy(&iscsilun->lbp, inq_lbp, 1957 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1958 scsi_free_scsi_task(inq_task); 1959 break; 1960 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1961 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1962 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1963 (void **) &inq_bl, errp); 1964 if (inq_task == NULL) { 1965 ret = -EINVAL; 1966 goto out; 1967 } 1968 memcpy(&iscsilun->bl, inq_bl, 1969 sizeof(struct scsi_inquiry_block_limits)); 1970 scsi_free_scsi_task(inq_task); 1971 break; 1972 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1973 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1974 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1975 (void **) &inq_di, errp); 1976 if (inq_task == NULL) { 1977 ret = -EINVAL; 1978 goto out; 1979 } 1980 iscsi_save_designator(iscsilun, inq_di); 1981 scsi_free_scsi_task(inq_task); 1982 break; 1983 default: 1984 break; 1985 } 1986 } 1987 scsi_free_scsi_task(task); 1988 task = NULL; 1989 1990 qemu_mutex_init(&iscsilun->mutex); 1991 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1992 1993 /* Guess the internal cluster (page) size of the iscsi target by the means 1994 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1995 * reasonable size */ 1996 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1997 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1998 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 1999 iscsilun->block_size; 2000 if (iscsilun->lbprz) { 2001 ret = iscsi_allocmap_init(iscsilun, flags); 2002 } 2003 } 2004 2005 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2006 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2007 } 2008 2009 out: 2010 qemu_opts_del(opts); 2011 g_free(initiator_name); 2012 if (task != NULL) { 2013 scsi_free_scsi_task(task); 2014 } 2015 2016 if (ret) { 2017 if (iscsi != NULL) { 2018 if (iscsi_is_logged_in(iscsi)) { 2019 iscsi_logout_sync(iscsi); 2020 } 2021 iscsi_destroy_context(iscsi); 2022 } 2023 memset(iscsilun, 0, sizeof(IscsiLun)); 2024 } 2025 2026 return ret; 2027 } 2028 2029 static void iscsi_close(BlockDriverState *bs) 2030 { 2031 IscsiLun *iscsilun = bs->opaque; 2032 struct iscsi_context *iscsi = iscsilun->iscsi; 2033 2034 iscsi_detach_aio_context(bs); 2035 if (iscsi_is_logged_in(iscsi)) { 2036 iscsi_logout_sync(iscsi); 2037 } 2038 iscsi_destroy_context(iscsi); 2039 if (iscsilun->dd) { 2040 g_free(iscsilun->dd->designator); 2041 g_free(iscsilun->dd); 2042 } 2043 g_free(iscsilun->zeroblock); 2044 iscsi_allocmap_free(iscsilun); 2045 qemu_mutex_destroy(&iscsilun->mutex); 2046 memset(iscsilun, 0, sizeof(IscsiLun)); 2047 } 2048 2049 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2050 { 2051 /* We don't actually refresh here, but just return data queried in 2052 * iscsi_open(): iscsi targets don't change their limits. */ 2053 2054 IscsiLun *iscsilun = bs->opaque; 2055 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2056 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2057 2058 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2059 2060 bs->bl.request_alignment = block_size; 2061 2062 if (iscsilun->bl.max_xfer_len) { 2063 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2064 } 2065 2066 if (max_xfer_len * block_size < INT_MAX) { 2067 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2068 } 2069 2070 if (iscsilun->lbp.lbpu) { 2071 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2072 bs->bl.max_pdiscard = 2073 iscsilun->bl.max_unmap * iscsilun->block_size; 2074 } 2075 bs->bl.pdiscard_alignment = 2076 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2077 } else { 2078 bs->bl.pdiscard_alignment = iscsilun->block_size; 2079 } 2080 2081 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2082 bs->bl.max_pwrite_zeroes = 2083 iscsilun->bl.max_ws_len * iscsilun->block_size; 2084 } 2085 if (iscsilun->lbp.lbpws) { 2086 bs->bl.pwrite_zeroes_alignment = 2087 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2088 } else { 2089 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2090 } 2091 if (iscsilun->bl.opt_xfer_len && 2092 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2093 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2094 iscsilun->block_size); 2095 } 2096 } 2097 2098 /* Note that this will not re-establish a connection with an iSCSI target - it 2099 * is effectively a NOP. */ 2100 static int iscsi_reopen_prepare(BDRVReopenState *state, 2101 BlockReopenQueue *queue, Error **errp) 2102 { 2103 IscsiLun *iscsilun = state->bs->opaque; 2104 2105 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2106 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2107 return -EACCES; 2108 } 2109 return 0; 2110 } 2111 2112 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2113 { 2114 IscsiLun *iscsilun = reopen_state->bs->opaque; 2115 2116 /* the cache.direct status might have changed */ 2117 if (iscsilun->allocmap != NULL) { 2118 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2119 } 2120 } 2121 2122 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2123 bool exact, PreallocMode prealloc, 2124 BdrvRequestFlags flags, Error **errp) 2125 { 2126 IscsiLun *iscsilun = bs->opaque; 2127 int64_t cur_length; 2128 Error *local_err = NULL; 2129 2130 if (prealloc != PREALLOC_MODE_OFF) { 2131 error_setg(errp, "Unsupported preallocation mode '%s'", 2132 PreallocMode_str(prealloc)); 2133 return -ENOTSUP; 2134 } 2135 2136 if (iscsilun->type != TYPE_DISK) { 2137 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2138 return -ENOTSUP; 2139 } 2140 2141 iscsi_readcapacity_sync(iscsilun, &local_err); 2142 if (local_err != NULL) { 2143 error_propagate(errp, local_err); 2144 return -EIO; 2145 } 2146 2147 cur_length = iscsi_getlength(bs); 2148 if (offset != cur_length && exact) { 2149 error_setg(errp, "Cannot resize iSCSI devices"); 2150 return -ENOTSUP; 2151 } else if (offset > cur_length) { 2152 error_setg(errp, "Cannot grow iSCSI devices"); 2153 return -EINVAL; 2154 } 2155 2156 if (iscsilun->allocmap != NULL) { 2157 iscsi_allocmap_init(iscsilun, bs->open_flags); 2158 } 2159 2160 return 0; 2161 } 2162 2163 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2164 { 2165 IscsiLun *iscsilun = bs->opaque; 2166 bdi->cluster_size = iscsilun->cluster_size; 2167 return 0; 2168 } 2169 2170 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2171 Error **errp) 2172 { 2173 IscsiLun *iscsilun = bs->opaque; 2174 iscsi_allocmap_invalidate(iscsilun); 2175 } 2176 2177 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2178 BdrvChild *src, 2179 uint64_t src_offset, 2180 BdrvChild *dst, 2181 uint64_t dst_offset, 2182 uint64_t bytes, 2183 BdrvRequestFlags read_flags, 2184 BdrvRequestFlags write_flags) 2185 { 2186 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2187 read_flags, write_flags); 2188 } 2189 2190 static struct scsi_task *iscsi_xcopy_task(int param_len) 2191 { 2192 struct scsi_task *task; 2193 2194 task = g_new0(struct scsi_task, 1); 2195 2196 task->cdb[0] = EXTENDED_COPY; 2197 task->cdb[10] = (param_len >> 24) & 0xFF; 2198 task->cdb[11] = (param_len >> 16) & 0xFF; 2199 task->cdb[12] = (param_len >> 8) & 0xFF; 2200 task->cdb[13] = param_len & 0xFF; 2201 task->cdb_size = 16; 2202 task->xfer_dir = SCSI_XFER_WRITE; 2203 task->expxferlen = param_len; 2204 2205 return task; 2206 } 2207 2208 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2209 { 2210 struct scsi_inquiry_device_designator *dd = lun->dd; 2211 2212 memset(desc, 0, 32); 2213 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2214 desc[4] = dd->code_set; 2215 desc[5] = (dd->designator_type & 0xF) 2216 | ((dd->association & 3) << 4); 2217 desc[7] = dd->designator_length; 2218 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2219 2220 desc[28] = 0; 2221 desc[29] = (lun->block_size >> 16) & 0xFF; 2222 desc[30] = (lun->block_size >> 8) & 0xFF; 2223 desc[31] = lun->block_size & 0xFF; 2224 } 2225 2226 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2227 int dst_index) 2228 { 2229 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2230 hdr[1] = ((dc << 1) | cat) & 0xFF; 2231 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2232 /* don't account for the first 4 bytes in descriptor header*/ 2233 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2234 hdr[4] = (src_index >> 8) & 0xFF; 2235 hdr[5] = src_index & 0xFF; 2236 hdr[6] = (dst_index >> 8) & 0xFF; 2237 hdr[7] = dst_index & 0xFF; 2238 } 2239 2240 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2241 int src_index, int dst_index, int num_blks, 2242 uint64_t src_lba, uint64_t dst_lba) 2243 { 2244 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2245 2246 /* The caller should verify the request size */ 2247 assert(num_blks < 65536); 2248 desc[10] = (num_blks >> 8) & 0xFF; 2249 desc[11] = num_blks & 0xFF; 2250 desc[12] = (src_lba >> 56) & 0xFF; 2251 desc[13] = (src_lba >> 48) & 0xFF; 2252 desc[14] = (src_lba >> 40) & 0xFF; 2253 desc[15] = (src_lba >> 32) & 0xFF; 2254 desc[16] = (src_lba >> 24) & 0xFF; 2255 desc[17] = (src_lba >> 16) & 0xFF; 2256 desc[18] = (src_lba >> 8) & 0xFF; 2257 desc[19] = src_lba & 0xFF; 2258 desc[20] = (dst_lba >> 56) & 0xFF; 2259 desc[21] = (dst_lba >> 48) & 0xFF; 2260 desc[22] = (dst_lba >> 40) & 0xFF; 2261 desc[23] = (dst_lba >> 32) & 0xFF; 2262 desc[24] = (dst_lba >> 24) & 0xFF; 2263 desc[25] = (dst_lba >> 16) & 0xFF; 2264 desc[26] = (dst_lba >> 8) & 0xFF; 2265 desc[27] = dst_lba & 0xFF; 2266 } 2267 2268 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2269 int list_id_usage, int prio, 2270 int tgt_desc_len, 2271 int seg_desc_len, int inline_data_len) 2272 { 2273 buf[0] = list_id; 2274 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2275 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2276 buf[3] = tgt_desc_len & 0xFF; 2277 buf[8] = (seg_desc_len >> 24) & 0xFF; 2278 buf[9] = (seg_desc_len >> 16) & 0xFF; 2279 buf[10] = (seg_desc_len >> 8) & 0xFF; 2280 buf[11] = seg_desc_len & 0xFF; 2281 buf[12] = (inline_data_len >> 24) & 0xFF; 2282 buf[13] = (inline_data_len >> 16) & 0xFF; 2283 buf[14] = (inline_data_len >> 8) & 0xFF; 2284 buf[15] = inline_data_len & 0xFF; 2285 } 2286 2287 static void iscsi_xcopy_data(struct iscsi_data *data, 2288 IscsiLun *src, int64_t src_lba, 2289 IscsiLun *dst, int64_t dst_lba, 2290 uint16_t num_blocks) 2291 { 2292 uint8_t *buf; 2293 const int src_offset = XCOPY_DESC_OFFSET; 2294 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2295 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2296 2297 data->size = XCOPY_DESC_OFFSET + 2298 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2299 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2300 data->data = g_malloc0(data->size); 2301 buf = data->data; 2302 2303 /* Initialise the parameter list header */ 2304 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2305 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2306 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2307 0); 2308 2309 /* Initialise CSCD list with one src + one dst descriptor */ 2310 iscsi_populate_target_desc(&buf[src_offset], src); 2311 iscsi_populate_target_desc(&buf[dst_offset], dst); 2312 2313 /* Initialise one segment descriptor */ 2314 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2315 src_lba, dst_lba); 2316 } 2317 2318 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2319 BdrvChild *src, 2320 uint64_t src_offset, 2321 BdrvChild *dst, 2322 uint64_t dst_offset, 2323 uint64_t bytes, 2324 BdrvRequestFlags read_flags, 2325 BdrvRequestFlags write_flags) 2326 { 2327 IscsiLun *dst_lun = dst->bs->opaque; 2328 IscsiLun *src_lun; 2329 struct IscsiTask iscsi_task; 2330 struct iscsi_data data; 2331 int r = 0; 2332 int block_size; 2333 2334 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2335 return -ENOTSUP; 2336 } 2337 src_lun = src->bs->opaque; 2338 2339 if (!src_lun->dd || !dst_lun->dd) { 2340 return -ENOTSUP; 2341 } 2342 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2343 return -ENOTSUP; 2344 } 2345 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2346 return -ENOTSUP; 2347 } 2348 if (dst_lun->block_size != src_lun->block_size || 2349 !dst_lun->block_size) { 2350 return -ENOTSUP; 2351 } 2352 2353 block_size = dst_lun->block_size; 2354 if (bytes / block_size > 65535) { 2355 return -ENOTSUP; 2356 } 2357 2358 iscsi_xcopy_data(&data, 2359 src_lun, src_offset / block_size, 2360 dst_lun, dst_offset / block_size, 2361 bytes / block_size); 2362 2363 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2364 2365 qemu_mutex_lock(&dst_lun->mutex); 2366 iscsi_task.task = iscsi_xcopy_task(data.size); 2367 retry: 2368 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2369 iscsi_task.task, iscsi_co_generic_cb, 2370 &data, 2371 &iscsi_task) != 0) { 2372 r = -EIO; 2373 goto out_unlock; 2374 } 2375 2376 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2377 2378 if (iscsi_task.do_retry) { 2379 iscsi_task.complete = 0; 2380 goto retry; 2381 } 2382 2383 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2384 r = iscsi_task.err_code; 2385 goto out_unlock; 2386 } 2387 2388 out_unlock: 2389 2390 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2391 g_free(iscsi_task.task); 2392 qemu_mutex_unlock(&dst_lun->mutex); 2393 g_free(iscsi_task.err_str); 2394 return r; 2395 } 2396 2397 2398 static const char *const iscsi_strong_runtime_opts[] = { 2399 "transport", 2400 "portal", 2401 "target", 2402 "user", 2403 "password", 2404 "password-secret", 2405 "lun", 2406 "initiator-name", 2407 "header-digest", 2408 2409 NULL 2410 }; 2411 2412 static BlockDriver bdrv_iscsi = { 2413 .format_name = "iscsi", 2414 .protocol_name = "iscsi", 2415 2416 .instance_size = sizeof(IscsiLun), 2417 .bdrv_parse_filename = iscsi_parse_filename, 2418 .bdrv_file_open = iscsi_open, 2419 .bdrv_close = iscsi_close, 2420 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 2421 .create_opts = &bdrv_create_opts_simple, 2422 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2423 .bdrv_reopen_commit = iscsi_reopen_commit, 2424 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2425 2426 .bdrv_getlength = iscsi_getlength, 2427 .bdrv_get_info = iscsi_get_info, 2428 .bdrv_co_truncate = iscsi_co_truncate, 2429 .bdrv_refresh_limits = iscsi_refresh_limits, 2430 2431 .bdrv_co_block_status = iscsi_co_block_status, 2432 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2433 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2434 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2435 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2436 .bdrv_co_readv = iscsi_co_readv, 2437 .bdrv_co_writev = iscsi_co_writev, 2438 .bdrv_co_flush_to_disk = iscsi_co_flush, 2439 2440 #ifdef __linux__ 2441 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2442 #endif 2443 2444 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2445 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2446 2447 .strong_runtime_opts = iscsi_strong_runtime_opts, 2448 }; 2449 2450 #if LIBISCSI_API_VERSION >= (20160603) 2451 static BlockDriver bdrv_iser = { 2452 .format_name = "iser", 2453 .protocol_name = "iser", 2454 2455 .instance_size = sizeof(IscsiLun), 2456 .bdrv_parse_filename = iscsi_parse_filename, 2457 .bdrv_file_open = iscsi_open, 2458 .bdrv_close = iscsi_close, 2459 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 2460 .create_opts = &bdrv_create_opts_simple, 2461 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2462 .bdrv_reopen_commit = iscsi_reopen_commit, 2463 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2464 2465 .bdrv_getlength = iscsi_getlength, 2466 .bdrv_get_info = iscsi_get_info, 2467 .bdrv_co_truncate = iscsi_co_truncate, 2468 .bdrv_refresh_limits = iscsi_refresh_limits, 2469 2470 .bdrv_co_block_status = iscsi_co_block_status, 2471 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2472 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2473 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2474 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2475 .bdrv_co_readv = iscsi_co_readv, 2476 .bdrv_co_writev = iscsi_co_writev, 2477 .bdrv_co_flush_to_disk = iscsi_co_flush, 2478 2479 #ifdef __linux__ 2480 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2481 #endif 2482 2483 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2484 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2485 2486 .strong_runtime_opts = iscsi_strong_runtime_opts, 2487 }; 2488 #endif 2489 2490 static void iscsi_block_init(void) 2491 { 2492 bdrv_register(&bdrv_iscsi); 2493 #if LIBISCSI_API_VERSION >= (20160603) 2494 bdrv_register(&bdrv_iser); 2495 #endif 2496 } 2497 2498 block_init(iscsi_block_init); 2499