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 int status; 121 int64_t sector_num; 122 int nb_sectors; 123 int ret; 124 #ifdef __linux__ 125 sg_io_hdr_t *ioh; 126 #endif 127 bool cancelled; 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 acb->common.cb(acb->common.opaque, acb->status); 154 155 if (acb->task != NULL) { 156 scsi_free_scsi_task(acb->task); 157 acb->task = NULL; 158 } 159 160 qemu_aio_unref(acb); 161 } 162 163 static void 164 iscsi_schedule_bh(IscsiAIOCB *acb) 165 { 166 if (acb->bh) { 167 return; 168 } 169 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 170 qemu_bh_schedule(acb->bh); 171 } 172 173 static void iscsi_co_generic_bh_cb(void *opaque) 174 { 175 struct IscsiTask *iTask = opaque; 176 177 iTask->complete = 1; 178 aio_co_wake(iTask->co); 179 } 180 181 static void iscsi_retry_timer_expired(void *opaque) 182 { 183 struct IscsiTask *iTask = opaque; 184 iTask->complete = 1; 185 if (iTask->co) { 186 aio_co_wake(iTask->co); 187 } 188 } 189 190 static inline unsigned exp_random(double mean) 191 { 192 return -mean * log((double)rand() / RAND_MAX); 193 } 194 195 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 196 * libiscsi 1.10.0, together with other constants we need. Use it as 197 * a hint that we have to define them ourselves if needed, to keep the 198 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 199 * the test because SCSI_STATUS_* is an enum. 200 * 201 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 202 * an enum, check against the LIBISCSI_API_VERSION macro, which was 203 * introduced in 1.11.0. If it is present, there is no need to define 204 * anything. 205 */ 206 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 207 !defined(LIBISCSI_API_VERSION) 208 #define SCSI_STATUS_TASK_SET_FULL 0x28 209 #define SCSI_STATUS_TIMEOUT 0x0f000002 210 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 211 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 212 #endif 213 214 #ifndef LIBISCSI_API_VERSION 215 #define LIBISCSI_API_VERSION 20130701 216 #endif 217 218 static int iscsi_translate_sense(struct scsi_sense *sense) 219 { 220 return - scsi_sense_to_errno(sense->key, 221 (sense->ascq & 0xFF00) >> 8, 222 sense->ascq & 0xFF); 223 } 224 225 /* Called (via iscsi_service) with QemuMutex held. */ 226 static void 227 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 228 void *command_data, void *opaque) 229 { 230 struct IscsiTask *iTask = opaque; 231 struct scsi_task *task = command_data; 232 233 iTask->status = status; 234 iTask->do_retry = 0; 235 iTask->task = task; 236 237 if (status != SCSI_STATUS_GOOD) { 238 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 239 if (status == SCSI_STATUS_CHECK_CONDITION 240 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 241 error_report("iSCSI CheckCondition: %s", 242 iscsi_get_error(iscsi)); 243 iTask->do_retry = 1; 244 goto out; 245 } 246 if (status == SCSI_STATUS_BUSY || 247 status == SCSI_STATUS_TIMEOUT || 248 status == SCSI_STATUS_TASK_SET_FULL) { 249 unsigned retry_time = 250 exp_random(iscsi_retry_times[iTask->retries - 1]); 251 if (status == SCSI_STATUS_TIMEOUT) { 252 /* make sure the request is rescheduled AFTER the 253 * reconnect is initiated */ 254 retry_time = EVENT_INTERVAL * 2; 255 iTask->iscsilun->request_timed_out = true; 256 } 257 error_report("iSCSI Busy/TaskSetFull/TimeOut" 258 " (retry #%u in %u ms): %s", 259 iTask->retries, retry_time, 260 iscsi_get_error(iscsi)); 261 aio_timer_init(iTask->iscsilun->aio_context, 262 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 263 SCALE_MS, iscsi_retry_timer_expired, iTask); 264 timer_mod(&iTask->retry_timer, 265 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 266 iTask->do_retry = 1; 267 return; 268 } 269 } 270 iTask->err_code = iscsi_translate_sense(&task->sense); 271 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 272 } 273 274 out: 275 if (iTask->co) { 276 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 277 iscsi_co_generic_bh_cb, iTask); 278 } else { 279 iTask->complete = 1; 280 } 281 } 282 283 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 284 { 285 *iTask = (struct IscsiTask) { 286 .co = qemu_coroutine_self(), 287 .iscsilun = iscsilun, 288 }; 289 } 290 291 /* Called (via iscsi_service) with QemuMutex held. */ 292 static void 293 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 294 void *private_data) 295 { 296 IscsiAIOCB *acb = private_data; 297 298 /* If the command callback hasn't been called yet, drop the task */ 299 if (!acb->bh) { 300 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 301 iscsi_scsi_cancel_task(iscsi, acb->task); 302 } 303 304 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 305 } 306 307 static void 308 iscsi_aio_cancel(BlockAIOCB *blockacb) 309 { 310 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 311 IscsiLun *iscsilun = acb->iscsilun; 312 313 qemu_mutex_lock(&iscsilun->mutex); 314 315 /* If it was cancelled or completed already, our work is done here */ 316 if (acb->cancelled || acb->status != -EINPROGRESS) { 317 qemu_mutex_unlock(&iscsilun->mutex); 318 return; 319 } 320 321 acb->cancelled = true; 322 323 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 324 325 /* send a task mgmt call to the target to cancel the task on the target */ 326 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 327 iscsi_abort_task_cb, acb) < 0) { 328 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 329 } 330 331 qemu_mutex_unlock(&iscsilun->mutex); 332 } 333 334 static const AIOCBInfo iscsi_aiocb_info = { 335 .aiocb_size = sizeof(IscsiAIOCB), 336 .cancel_async = iscsi_aio_cancel, 337 }; 338 339 340 static void iscsi_process_read(void *arg); 341 static void iscsi_process_write(void *arg); 342 343 /* Called with QemuMutex held. */ 344 static void 345 iscsi_set_events(IscsiLun *iscsilun) 346 { 347 struct iscsi_context *iscsi = iscsilun->iscsi; 348 int ev = iscsi_which_events(iscsi); 349 350 if (ev != iscsilun->events) { 351 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 352 false, 353 (ev & POLLIN) ? iscsi_process_read : NULL, 354 (ev & POLLOUT) ? iscsi_process_write : NULL, 355 NULL, 356 iscsilun); 357 iscsilun->events = ev; 358 } 359 } 360 361 static void iscsi_timed_check_events(void *opaque) 362 { 363 IscsiLun *iscsilun = opaque; 364 365 qemu_mutex_lock(&iscsilun->mutex); 366 367 /* check for timed out requests */ 368 iscsi_service(iscsilun->iscsi, 0); 369 370 if (iscsilun->request_timed_out) { 371 iscsilun->request_timed_out = false; 372 iscsi_reconnect(iscsilun->iscsi); 373 } 374 375 /* newer versions of libiscsi may return zero events. Ensure we are able 376 * to return to service once this situation changes. */ 377 iscsi_set_events(iscsilun); 378 379 qemu_mutex_unlock(&iscsilun->mutex); 380 381 timer_mod(iscsilun->event_timer, 382 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 383 } 384 385 static void 386 iscsi_process_read(void *arg) 387 { 388 IscsiLun *iscsilun = arg; 389 struct iscsi_context *iscsi = iscsilun->iscsi; 390 391 qemu_mutex_lock(&iscsilun->mutex); 392 iscsi_service(iscsi, POLLIN); 393 iscsi_set_events(iscsilun); 394 qemu_mutex_unlock(&iscsilun->mutex); 395 } 396 397 static void 398 iscsi_process_write(void *arg) 399 { 400 IscsiLun *iscsilun = arg; 401 struct iscsi_context *iscsi = iscsilun->iscsi; 402 403 qemu_mutex_lock(&iscsilun->mutex); 404 iscsi_service(iscsi, POLLOUT); 405 iscsi_set_events(iscsilun); 406 qemu_mutex_unlock(&iscsilun->mutex); 407 } 408 409 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 410 { 411 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 412 } 413 414 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 415 { 416 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 417 } 418 419 static bool is_byte_request_lun_aligned(int64_t offset, int count, 420 IscsiLun *iscsilun) 421 { 422 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 423 error_report("iSCSI misaligned request: " 424 "iscsilun->block_size %u, offset %" PRIi64 425 ", count %d", 426 iscsilun->block_size, offset, count); 427 return false; 428 } 429 return true; 430 } 431 432 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 433 IscsiLun *iscsilun) 434 { 435 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 436 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 437 nb_sectors << BDRV_SECTOR_BITS, 438 iscsilun); 439 } 440 441 static void iscsi_allocmap_free(IscsiLun *iscsilun) 442 { 443 g_free(iscsilun->allocmap); 444 g_free(iscsilun->allocmap_valid); 445 iscsilun->allocmap = NULL; 446 iscsilun->allocmap_valid = NULL; 447 } 448 449 450 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 451 { 452 iscsi_allocmap_free(iscsilun); 453 454 assert(iscsilun->cluster_size); 455 iscsilun->allocmap_size = 456 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 457 iscsilun->cluster_size); 458 459 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 460 if (!iscsilun->allocmap) { 461 return -ENOMEM; 462 } 463 464 if (open_flags & BDRV_O_NOCACHE) { 465 /* when cache.direct = on all allocmap entries are 466 * treated as invalid to force a relookup of the block 467 * status on every read request */ 468 return 0; 469 } 470 471 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 472 if (!iscsilun->allocmap_valid) { 473 /* if we are under memory pressure free the allocmap as well */ 474 iscsi_allocmap_free(iscsilun); 475 return -ENOMEM; 476 } 477 478 return 0; 479 } 480 481 static void 482 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 483 int64_t bytes, bool allocated, bool valid) 484 { 485 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 486 487 if (iscsilun->allocmap == NULL) { 488 return; 489 } 490 /* expand to entirely contain all affected clusters */ 491 assert(iscsilun->cluster_size); 492 cl_num_expanded = offset / iscsilun->cluster_size; 493 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 494 iscsilun->cluster_size) - cl_num_expanded; 495 /* shrink to touch only completely contained clusters */ 496 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 497 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 498 if (allocated) { 499 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 500 } else { 501 if (nb_cls_shrunk > 0) { 502 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 503 } 504 } 505 506 if (iscsilun->allocmap_valid == NULL) { 507 return; 508 } 509 if (valid) { 510 if (nb_cls_shrunk > 0) { 511 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 512 } 513 } else { 514 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 515 nb_cls_expanded); 516 } 517 } 518 519 static void 520 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 521 int64_t bytes) 522 { 523 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 524 } 525 526 static void 527 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 528 int64_t bytes) 529 { 530 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 531 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 532 */ 533 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 534 } 535 536 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 537 int64_t bytes) 538 { 539 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 540 } 541 542 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 543 { 544 if (iscsilun->allocmap) { 545 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 546 } 547 if (iscsilun->allocmap_valid) { 548 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 549 } 550 } 551 552 static inline bool 553 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 554 int64_t bytes) 555 { 556 unsigned long size; 557 if (iscsilun->allocmap == NULL) { 558 return true; 559 } 560 assert(iscsilun->cluster_size); 561 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 562 return !(find_next_bit(iscsilun->allocmap, size, 563 offset / iscsilun->cluster_size) == size); 564 } 565 566 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 567 int64_t offset, int64_t bytes) 568 { 569 unsigned long size; 570 if (iscsilun->allocmap_valid == NULL) { 571 return false; 572 } 573 assert(iscsilun->cluster_size); 574 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 575 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 576 offset / iscsilun->cluster_size) == size); 577 } 578 579 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 580 IscsiLun *iscsilun) 581 { 582 while (!iTask->complete) { 583 iscsi_set_events(iscsilun); 584 qemu_mutex_unlock(&iscsilun->mutex); 585 qemu_coroutine_yield(); 586 qemu_mutex_lock(&iscsilun->mutex); 587 } 588 } 589 590 static int coroutine_fn 591 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 592 QEMUIOVector *iov, int flags) 593 { 594 IscsiLun *iscsilun = bs->opaque; 595 struct IscsiTask iTask; 596 uint64_t lba; 597 uint32_t num_sectors; 598 bool fua = flags & BDRV_REQ_FUA; 599 int r = 0; 600 601 if (fua) { 602 assert(iscsilun->dpofua); 603 } 604 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 605 return -EINVAL; 606 } 607 608 if (bs->bl.max_transfer) { 609 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 610 } 611 612 lba = sector_qemu2lun(sector_num, iscsilun); 613 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 614 iscsi_co_init_iscsitask(iscsilun, &iTask); 615 qemu_mutex_lock(&iscsilun->mutex); 616 retry: 617 if (iscsilun->use_16_for_rw) { 618 #if LIBISCSI_API_VERSION >= (20160603) 619 iTask.task = iscsi_write16_iov_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 (struct scsi_iovec *)iov->iov, iov->niov); 624 } else { 625 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 626 NULL, num_sectors * iscsilun->block_size, 627 iscsilun->block_size, 0, 0, fua, 0, 0, 628 iscsi_co_generic_cb, &iTask, 629 (struct scsi_iovec *)iov->iov, iov->niov); 630 } 631 #else 632 iTask.task = iscsi_write16_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 } else { 637 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 638 NULL, num_sectors * iscsilun->block_size, 639 iscsilun->block_size, 0, 0, fua, 0, 0, 640 iscsi_co_generic_cb, &iTask); 641 } 642 #endif 643 if (iTask.task == NULL) { 644 qemu_mutex_unlock(&iscsilun->mutex); 645 return -ENOMEM; 646 } 647 #if LIBISCSI_API_VERSION < (20160603) 648 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 649 iov->niov); 650 #endif 651 iscsi_co_wait_for_task(&iTask, iscsilun); 652 653 if (iTask.task != NULL) { 654 scsi_free_scsi_task(iTask.task); 655 iTask.task = NULL; 656 } 657 658 if (iTask.do_retry) { 659 iTask.complete = 0; 660 goto retry; 661 } 662 663 if (iTask.status != SCSI_STATUS_GOOD) { 664 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 665 nb_sectors * BDRV_SECTOR_SIZE); 666 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 667 iTask.err_str); 668 r = iTask.err_code; 669 goto out_unlock; 670 } 671 672 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 673 nb_sectors * BDRV_SECTOR_SIZE); 674 675 out_unlock: 676 qemu_mutex_unlock(&iscsilun->mutex); 677 g_free(iTask.err_str); 678 return r; 679 } 680 681 682 683 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 684 bool want_zero, int64_t offset, 685 int64_t bytes, int64_t *pnum, 686 int64_t *map, 687 BlockDriverState **file) 688 { 689 IscsiLun *iscsilun = bs->opaque; 690 struct scsi_get_lba_status *lbas = NULL; 691 struct scsi_lba_status_descriptor *lbasd = NULL; 692 struct IscsiTask iTask; 693 uint64_t lba; 694 int ret; 695 696 iscsi_co_init_iscsitask(iscsilun, &iTask); 697 698 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 699 700 /* default to all sectors allocated */ 701 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 702 if (map) { 703 *map = offset; 704 } 705 *pnum = bytes; 706 707 /* LUN does not support logical block provisioning */ 708 if (!iscsilun->lbpme) { 709 goto out; 710 } 711 712 lba = offset / iscsilun->block_size; 713 714 qemu_mutex_lock(&iscsilun->mutex); 715 retry: 716 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 717 lba, 8 + 16, iscsi_co_generic_cb, 718 &iTask) == NULL) { 719 ret = -ENOMEM; 720 goto out_unlock; 721 } 722 iscsi_co_wait_for_task(&iTask, iscsilun); 723 724 if (iTask.do_retry) { 725 if (iTask.task != NULL) { 726 scsi_free_scsi_task(iTask.task); 727 iTask.task = NULL; 728 } 729 iTask.complete = 0; 730 goto retry; 731 } 732 733 if (iTask.status != SCSI_STATUS_GOOD) { 734 /* in case the get_lba_status_callout fails (i.e. 735 * because the device is busy or the cmd is not 736 * supported) we pretend all blocks are allocated 737 * for backwards compatibility */ 738 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 739 lba, iTask.err_str); 740 goto out_unlock; 741 } 742 743 lbas = scsi_datain_unmarshall(iTask.task); 744 if (lbas == NULL) { 745 ret = -EIO; 746 goto out_unlock; 747 } 748 749 lbasd = &lbas->descriptors[0]; 750 751 if (lba != lbasd->lba) { 752 ret = -EIO; 753 goto out_unlock; 754 } 755 756 *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size; 757 758 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 759 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 760 ret &= ~BDRV_BLOCK_DATA; 761 if (iscsilun->lbprz) { 762 ret |= BDRV_BLOCK_ZERO; 763 } 764 } 765 766 if (ret & BDRV_BLOCK_ZERO) { 767 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 768 } else { 769 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 770 } 771 772 if (*pnum > bytes) { 773 *pnum = bytes; 774 } 775 out_unlock: 776 qemu_mutex_unlock(&iscsilun->mutex); 777 g_free(iTask.err_str); 778 out: 779 if (iTask.task != NULL) { 780 scsi_free_scsi_task(iTask.task); 781 } 782 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 783 *file = bs; 784 } 785 return ret; 786 } 787 788 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 789 int64_t sector_num, int nb_sectors, 790 QEMUIOVector *iov) 791 { 792 IscsiLun *iscsilun = bs->opaque; 793 struct IscsiTask iTask; 794 uint64_t lba; 795 uint32_t num_sectors; 796 int r = 0; 797 798 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 799 return -EINVAL; 800 } 801 802 if (bs->bl.max_transfer) { 803 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 804 } 805 806 /* if cache.direct is off and we have a valid entry in our allocation map 807 * we can skip checking the block status and directly return zeroes if 808 * the request falls within an unallocated area */ 809 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 810 nb_sectors * BDRV_SECTOR_SIZE) && 811 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 812 nb_sectors * BDRV_SECTOR_SIZE)) { 813 qemu_iovec_memset(iov, 0, 0x00, iov->size); 814 return 0; 815 } 816 817 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 818 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 819 nb_sectors * BDRV_SECTOR_SIZE) && 820 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 821 nb_sectors * BDRV_SECTOR_SIZE)) { 822 int64_t pnum; 823 /* check the block status from the beginning of the cluster 824 * containing the start sector */ 825 int64_t head; 826 int ret; 827 828 assert(iscsilun->cluster_size); 829 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 830 ret = iscsi_co_block_status(bs, true, 831 sector_num * BDRV_SECTOR_SIZE - head, 832 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 833 if (ret < 0) { 834 return ret; 835 } 836 /* if the whole request falls into an unallocated area we can avoid 837 * reading and directly return zeroes instead */ 838 if (ret & BDRV_BLOCK_ZERO && 839 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 840 qemu_iovec_memset(iov, 0, 0x00, iov->size); 841 return 0; 842 } 843 } 844 845 lba = sector_qemu2lun(sector_num, iscsilun); 846 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 847 848 iscsi_co_init_iscsitask(iscsilun, &iTask); 849 qemu_mutex_lock(&iscsilun->mutex); 850 retry: 851 if (iscsilun->use_16_for_rw) { 852 #if LIBISCSI_API_VERSION >= (20160603) 853 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 854 num_sectors * iscsilun->block_size, 855 iscsilun->block_size, 0, 0, 0, 0, 0, 856 iscsi_co_generic_cb, &iTask, 857 (struct scsi_iovec *)iov->iov, iov->niov); 858 } else { 859 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 860 num_sectors * iscsilun->block_size, 861 iscsilun->block_size, 862 0, 0, 0, 0, 0, 863 iscsi_co_generic_cb, &iTask, 864 (struct scsi_iovec *)iov->iov, iov->niov); 865 } 866 #else 867 iTask.task = iscsi_read16_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 } else { 872 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 873 num_sectors * iscsilun->block_size, 874 iscsilun->block_size, 875 0, 0, 0, 0, 0, 876 iscsi_co_generic_cb, &iTask); 877 } 878 #endif 879 if (iTask.task == NULL) { 880 qemu_mutex_unlock(&iscsilun->mutex); 881 return -ENOMEM; 882 } 883 #if LIBISCSI_API_VERSION < (20160603) 884 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 885 #endif 886 887 iscsi_co_wait_for_task(&iTask, iscsilun); 888 if (iTask.task != NULL) { 889 scsi_free_scsi_task(iTask.task); 890 iTask.task = NULL; 891 } 892 893 if (iTask.do_retry) { 894 iTask.complete = 0; 895 goto retry; 896 } 897 898 if (iTask.status != SCSI_STATUS_GOOD) { 899 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 900 lba, iTask.err_str); 901 r = iTask.err_code; 902 } 903 904 qemu_mutex_unlock(&iscsilun->mutex); 905 g_free(iTask.err_str); 906 return r; 907 } 908 909 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 910 { 911 IscsiLun *iscsilun = bs->opaque; 912 struct IscsiTask iTask; 913 int r = 0; 914 915 iscsi_co_init_iscsitask(iscsilun, &iTask); 916 qemu_mutex_lock(&iscsilun->mutex); 917 retry: 918 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 919 0, iscsi_co_generic_cb, &iTask) == NULL) { 920 qemu_mutex_unlock(&iscsilun->mutex); 921 return -ENOMEM; 922 } 923 924 iscsi_co_wait_for_task(&iTask, iscsilun); 925 926 if (iTask.task != NULL) { 927 scsi_free_scsi_task(iTask.task); 928 iTask.task = NULL; 929 } 930 931 if (iTask.do_retry) { 932 iTask.complete = 0; 933 goto retry; 934 } 935 936 if (iTask.status != SCSI_STATUS_GOOD) { 937 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 938 r = iTask.err_code; 939 } 940 941 qemu_mutex_unlock(&iscsilun->mutex); 942 g_free(iTask.err_str); 943 return r; 944 } 945 946 #ifdef __linux__ 947 /* Called (via iscsi_service) with QemuMutex held. */ 948 static void 949 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 950 void *command_data, void *opaque) 951 { 952 IscsiAIOCB *acb = opaque; 953 954 if (status == SCSI_STATUS_CANCELLED) { 955 if (!acb->bh) { 956 acb->status = -ECANCELED; 957 iscsi_schedule_bh(acb); 958 } 959 return; 960 } 961 962 acb->status = 0; 963 if (status < 0) { 964 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 965 iscsi_get_error(iscsi)); 966 acb->status = iscsi_translate_sense(&acb->task->sense); 967 } 968 969 acb->ioh->driver_status = 0; 970 acb->ioh->host_status = 0; 971 acb->ioh->resid = 0; 972 acb->ioh->status = status; 973 974 #define SG_ERR_DRIVER_SENSE 0x08 975 976 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 977 int ss; 978 979 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 980 981 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 982 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 983 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 984 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 985 } 986 987 iscsi_schedule_bh(acb); 988 } 989 990 static void iscsi_ioctl_bh_completion(void *opaque) 991 { 992 IscsiAIOCB *acb = opaque; 993 994 qemu_bh_delete(acb->bh); 995 acb->common.cb(acb->common.opaque, acb->ret); 996 qemu_aio_unref(acb); 997 } 998 999 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 1000 { 1001 BlockDriverState *bs = acb->common.bs; 1002 IscsiLun *iscsilun = bs->opaque; 1003 int ret = 0; 1004 1005 switch (req) { 1006 case SG_GET_VERSION_NUM: 1007 *(int *)buf = 30000; 1008 break; 1009 case SG_GET_SCSI_ID: 1010 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 1011 break; 1012 default: 1013 ret = -EINVAL; 1014 } 1015 assert(!acb->bh); 1016 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 1017 iscsi_ioctl_bh_completion, acb); 1018 acb->ret = ret; 1019 qemu_bh_schedule(acb->bh); 1020 } 1021 1022 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1023 unsigned long int req, void *buf, 1024 BlockCompletionFunc *cb, void *opaque) 1025 { 1026 IscsiLun *iscsilun = bs->opaque; 1027 struct iscsi_context *iscsi = iscsilun->iscsi; 1028 struct iscsi_data data; 1029 IscsiAIOCB *acb; 1030 1031 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1032 1033 acb->iscsilun = iscsilun; 1034 acb->bh = NULL; 1035 acb->status = -EINPROGRESS; 1036 acb->ioh = buf; 1037 acb->cancelled = false; 1038 1039 if (req != SG_IO) { 1040 iscsi_ioctl_handle_emulated(acb, req, buf); 1041 return &acb->common; 1042 } 1043 1044 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1045 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1046 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1047 qemu_aio_unref(acb); 1048 return NULL; 1049 } 1050 1051 acb->task = malloc(sizeof(struct scsi_task)); 1052 if (acb->task == NULL) { 1053 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1054 iscsi_get_error(iscsi)); 1055 qemu_aio_unref(acb); 1056 return NULL; 1057 } 1058 memset(acb->task, 0, sizeof(struct scsi_task)); 1059 1060 switch (acb->ioh->dxfer_direction) { 1061 case SG_DXFER_TO_DEV: 1062 acb->task->xfer_dir = SCSI_XFER_WRITE; 1063 break; 1064 case SG_DXFER_FROM_DEV: 1065 acb->task->xfer_dir = SCSI_XFER_READ; 1066 break; 1067 default: 1068 acb->task->xfer_dir = SCSI_XFER_NONE; 1069 break; 1070 } 1071 1072 acb->task->cdb_size = acb->ioh->cmd_len; 1073 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1074 acb->task->expxferlen = acb->ioh->dxfer_len; 1075 1076 data.size = 0; 1077 qemu_mutex_lock(&iscsilun->mutex); 1078 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1079 if (acb->ioh->iovec_count == 0) { 1080 data.data = acb->ioh->dxferp; 1081 data.size = acb->ioh->dxfer_len; 1082 } else { 1083 scsi_task_set_iov_out(acb->task, 1084 (struct scsi_iovec *) acb->ioh->dxferp, 1085 acb->ioh->iovec_count); 1086 } 1087 } 1088 1089 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1090 iscsi_aio_ioctl_cb, 1091 (data.size > 0) ? &data : NULL, 1092 acb) != 0) { 1093 qemu_mutex_unlock(&iscsilun->mutex); 1094 scsi_free_scsi_task(acb->task); 1095 qemu_aio_unref(acb); 1096 return NULL; 1097 } 1098 1099 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1100 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1101 if (acb->ioh->iovec_count == 0) { 1102 scsi_task_add_data_in_buffer(acb->task, 1103 acb->ioh->dxfer_len, 1104 acb->ioh->dxferp); 1105 } else { 1106 scsi_task_set_iov_in(acb->task, 1107 (struct scsi_iovec *) acb->ioh->dxferp, 1108 acb->ioh->iovec_count); 1109 } 1110 } 1111 1112 iscsi_set_events(iscsilun); 1113 qemu_mutex_unlock(&iscsilun->mutex); 1114 1115 return &acb->common; 1116 } 1117 1118 #endif 1119 1120 static int64_t 1121 iscsi_getlength(BlockDriverState *bs) 1122 { 1123 IscsiLun *iscsilun = bs->opaque; 1124 int64_t len; 1125 1126 len = iscsilun->num_blocks; 1127 len *= iscsilun->block_size; 1128 1129 return len; 1130 } 1131 1132 static int 1133 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1134 { 1135 IscsiLun *iscsilun = bs->opaque; 1136 struct IscsiTask iTask; 1137 struct unmap_list list; 1138 int r = 0; 1139 1140 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1141 return -ENOTSUP; 1142 } 1143 1144 if (!iscsilun->lbp.lbpu) { 1145 /* UNMAP is not supported by the target */ 1146 return 0; 1147 } 1148 1149 list.lba = offset / iscsilun->block_size; 1150 list.num = bytes / iscsilun->block_size; 1151 1152 iscsi_co_init_iscsitask(iscsilun, &iTask); 1153 qemu_mutex_lock(&iscsilun->mutex); 1154 retry: 1155 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1156 iscsi_co_generic_cb, &iTask) == NULL) { 1157 r = -ENOMEM; 1158 goto out_unlock; 1159 } 1160 1161 iscsi_co_wait_for_task(&iTask, iscsilun); 1162 1163 if (iTask.task != NULL) { 1164 scsi_free_scsi_task(iTask.task); 1165 iTask.task = NULL; 1166 } 1167 1168 if (iTask.do_retry) { 1169 iTask.complete = 0; 1170 goto retry; 1171 } 1172 1173 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1174 1175 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1176 /* the target might fail with a check condition if it 1177 is not happy with the alignment of the UNMAP request 1178 we silently fail in this case */ 1179 goto out_unlock; 1180 } 1181 1182 if (iTask.status != SCSI_STATUS_GOOD) { 1183 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1184 list.lba, iTask.err_str); 1185 r = iTask.err_code; 1186 goto out_unlock; 1187 } 1188 1189 out_unlock: 1190 qemu_mutex_unlock(&iscsilun->mutex); 1191 g_free(iTask.err_str); 1192 return r; 1193 } 1194 1195 static int 1196 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1197 int bytes, BdrvRequestFlags flags) 1198 { 1199 IscsiLun *iscsilun = bs->opaque; 1200 struct IscsiTask iTask; 1201 uint64_t lba; 1202 uint32_t nb_blocks; 1203 bool use_16_for_ws = iscsilun->use_16_for_rw; 1204 int r = 0; 1205 1206 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1207 return -ENOTSUP; 1208 } 1209 1210 if (flags & BDRV_REQ_MAY_UNMAP) { 1211 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1212 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1213 use_16_for_ws = true; 1214 } 1215 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1216 /* WRITESAME16 with UNMAP is not supported by the target, 1217 * fall back and try WRITESAME10/16 without UNMAP */ 1218 flags &= ~BDRV_REQ_MAY_UNMAP; 1219 use_16_for_ws = iscsilun->use_16_for_rw; 1220 } 1221 } 1222 1223 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1224 /* WRITESAME without UNMAP is not supported by the target */ 1225 return -ENOTSUP; 1226 } 1227 1228 lba = offset / iscsilun->block_size; 1229 nb_blocks = bytes / iscsilun->block_size; 1230 1231 if (iscsilun->zeroblock == NULL) { 1232 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1233 if (iscsilun->zeroblock == NULL) { 1234 return -ENOMEM; 1235 } 1236 } 1237 1238 qemu_mutex_lock(&iscsilun->mutex); 1239 iscsi_co_init_iscsitask(iscsilun, &iTask); 1240 retry: 1241 if (use_16_for_ws) { 1242 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1243 iscsilun->zeroblock, iscsilun->block_size, 1244 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1245 0, 0, iscsi_co_generic_cb, &iTask); 1246 } else { 1247 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1248 iscsilun->zeroblock, iscsilun->block_size, 1249 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1250 0, 0, iscsi_co_generic_cb, &iTask); 1251 } 1252 if (iTask.task == NULL) { 1253 qemu_mutex_unlock(&iscsilun->mutex); 1254 return -ENOMEM; 1255 } 1256 1257 iscsi_co_wait_for_task(&iTask, iscsilun); 1258 1259 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1260 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1261 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1262 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1263 /* WRITE SAME is not supported by the target */ 1264 iscsilun->has_write_same = false; 1265 scsi_free_scsi_task(iTask.task); 1266 r = -ENOTSUP; 1267 goto out_unlock; 1268 } 1269 1270 if (iTask.task != NULL) { 1271 scsi_free_scsi_task(iTask.task); 1272 iTask.task = NULL; 1273 } 1274 1275 if (iTask.do_retry) { 1276 iTask.complete = 0; 1277 goto retry; 1278 } 1279 1280 if (iTask.status != SCSI_STATUS_GOOD) { 1281 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1282 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1283 lba, iTask.err_str); 1284 r = iTask.err_code; 1285 goto out_unlock; 1286 } 1287 1288 if (flags & BDRV_REQ_MAY_UNMAP) { 1289 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1290 } else { 1291 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1292 } 1293 1294 out_unlock: 1295 qemu_mutex_unlock(&iscsilun->mutex); 1296 g_free(iTask.err_str); 1297 return r; 1298 } 1299 1300 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1301 Error **errp) 1302 { 1303 const char *user = NULL; 1304 const char *password = NULL; 1305 const char *secretid; 1306 char *secret = NULL; 1307 1308 user = qemu_opt_get(opts, "user"); 1309 if (!user) { 1310 return; 1311 } 1312 1313 secretid = qemu_opt_get(opts, "password-secret"); 1314 password = qemu_opt_get(opts, "password"); 1315 if (secretid && password) { 1316 error_setg(errp, "'password' and 'password-secret' properties are " 1317 "mutually exclusive"); 1318 return; 1319 } 1320 if (secretid) { 1321 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1322 if (!secret) { 1323 return; 1324 } 1325 password = secret; 1326 } else if (!password) { 1327 error_setg(errp, "CHAP username specified but no password was given"); 1328 return; 1329 } 1330 1331 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1332 error_setg(errp, "Failed to set initiator username and password"); 1333 } 1334 1335 g_free(secret); 1336 } 1337 1338 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1339 Error **errp) 1340 { 1341 const char *digest = NULL; 1342 1343 digest = qemu_opt_get(opts, "header-digest"); 1344 if (!digest) { 1345 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1346 } else if (!strcmp(digest, "crc32c")) { 1347 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1348 } else if (!strcmp(digest, "none")) { 1349 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1350 } else if (!strcmp(digest, "crc32c-none")) { 1351 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1352 } else if (!strcmp(digest, "none-crc32c")) { 1353 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1354 } else { 1355 error_setg(errp, "Invalid header-digest setting : %s", digest); 1356 } 1357 } 1358 1359 static char *get_initiator_name(QemuOpts *opts) 1360 { 1361 const char *name; 1362 char *iscsi_name; 1363 UuidInfo *uuid_info; 1364 1365 name = qemu_opt_get(opts, "initiator-name"); 1366 if (name) { 1367 return g_strdup(name); 1368 } 1369 1370 uuid_info = qmp_query_uuid(NULL); 1371 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1372 name = qemu_get_vm_name(); 1373 } else { 1374 name = uuid_info->UUID; 1375 } 1376 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1377 name ? ":" : "", name ? name : ""); 1378 qapi_free_UuidInfo(uuid_info); 1379 return iscsi_name; 1380 } 1381 1382 static void iscsi_nop_timed_event(void *opaque) 1383 { 1384 IscsiLun *iscsilun = opaque; 1385 1386 qemu_mutex_lock(&iscsilun->mutex); 1387 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1388 error_report("iSCSI: NOP timeout. Reconnecting..."); 1389 iscsilun->request_timed_out = true; 1390 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1391 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1392 goto out; 1393 } 1394 1395 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1396 iscsi_set_events(iscsilun); 1397 1398 out: 1399 qemu_mutex_unlock(&iscsilun->mutex); 1400 } 1401 1402 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1403 { 1404 struct scsi_task *task = NULL; 1405 struct scsi_readcapacity10 *rc10 = NULL; 1406 struct scsi_readcapacity16 *rc16 = NULL; 1407 int retries = ISCSI_CMD_RETRIES; 1408 1409 do { 1410 if (task != NULL) { 1411 scsi_free_scsi_task(task); 1412 task = NULL; 1413 } 1414 1415 switch (iscsilun->type) { 1416 case TYPE_DISK: 1417 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1418 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1419 rc16 = scsi_datain_unmarshall(task); 1420 if (rc16 == NULL) { 1421 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1422 } else { 1423 iscsilun->block_size = rc16->block_length; 1424 iscsilun->num_blocks = rc16->returned_lba + 1; 1425 iscsilun->lbpme = !!rc16->lbpme; 1426 iscsilun->lbprz = !!rc16->lbprz; 1427 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1428 } 1429 break; 1430 } 1431 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1432 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1433 break; 1434 } 1435 /* Fall through and try READ CAPACITY(10) instead. */ 1436 case TYPE_ROM: 1437 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1438 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1439 rc10 = scsi_datain_unmarshall(task); 1440 if (rc10 == NULL) { 1441 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1442 } else { 1443 iscsilun->block_size = rc10->block_size; 1444 if (rc10->lba == 0) { 1445 /* blank disk loaded */ 1446 iscsilun->num_blocks = 0; 1447 } else { 1448 iscsilun->num_blocks = rc10->lba + 1; 1449 } 1450 } 1451 } 1452 break; 1453 default: 1454 return; 1455 } 1456 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1457 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1458 && retries-- > 0); 1459 1460 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1461 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1462 } else if (!iscsilun->block_size || 1463 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1464 error_setg(errp, "iSCSI: the target returned an invalid " 1465 "block size of %d.", iscsilun->block_size); 1466 } 1467 if (task) { 1468 scsi_free_scsi_task(task); 1469 } 1470 } 1471 1472 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1473 int evpd, int pc, void **inq, Error **errp) 1474 { 1475 int full_size; 1476 struct scsi_task *task = NULL; 1477 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1478 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1479 goto fail; 1480 } 1481 full_size = scsi_datain_getfullsize(task); 1482 if (full_size > task->datain.size) { 1483 scsi_free_scsi_task(task); 1484 1485 /* we need more data for the full list */ 1486 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1487 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1488 goto fail; 1489 } 1490 } 1491 1492 *inq = scsi_datain_unmarshall(task); 1493 if (*inq == NULL) { 1494 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1495 goto fail_with_err; 1496 } 1497 1498 return task; 1499 1500 fail: 1501 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1502 iscsi_get_error(iscsi)); 1503 fail_with_err: 1504 if (task != NULL) { 1505 scsi_free_scsi_task(task); 1506 } 1507 return NULL; 1508 } 1509 1510 static void iscsi_detach_aio_context(BlockDriverState *bs) 1511 { 1512 IscsiLun *iscsilun = bs->opaque; 1513 1514 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1515 false, NULL, NULL, NULL, NULL); 1516 iscsilun->events = 0; 1517 1518 if (iscsilun->nop_timer) { 1519 timer_del(iscsilun->nop_timer); 1520 timer_free(iscsilun->nop_timer); 1521 iscsilun->nop_timer = NULL; 1522 } 1523 if (iscsilun->event_timer) { 1524 timer_del(iscsilun->event_timer); 1525 timer_free(iscsilun->event_timer); 1526 iscsilun->event_timer = NULL; 1527 } 1528 } 1529 1530 static void iscsi_attach_aio_context(BlockDriverState *bs, 1531 AioContext *new_context) 1532 { 1533 IscsiLun *iscsilun = bs->opaque; 1534 1535 iscsilun->aio_context = new_context; 1536 iscsi_set_events(iscsilun); 1537 1538 /* Set up a timer for sending out iSCSI NOPs */ 1539 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1540 QEMU_CLOCK_REALTIME, SCALE_MS, 1541 iscsi_nop_timed_event, iscsilun); 1542 timer_mod(iscsilun->nop_timer, 1543 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1544 1545 /* Set up a timer for periodic calls to iscsi_set_events and to 1546 * scan for command timeout */ 1547 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1548 QEMU_CLOCK_REALTIME, SCALE_MS, 1549 iscsi_timed_check_events, iscsilun); 1550 timer_mod(iscsilun->event_timer, 1551 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1552 } 1553 1554 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1555 { 1556 struct scsi_task *task; 1557 struct scsi_mode_sense *ms = NULL; 1558 iscsilun->write_protected = false; 1559 iscsilun->dpofua = false; 1560 1561 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1562 1, SCSI_MODESENSE_PC_CURRENT, 1563 0x3F, 0, 255); 1564 if (task == NULL) { 1565 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1566 iscsi_get_error(iscsilun->iscsi)); 1567 goto out; 1568 } 1569 1570 if (task->status != SCSI_STATUS_GOOD) { 1571 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1572 goto out; 1573 } 1574 ms = scsi_datain_unmarshall(task); 1575 if (!ms) { 1576 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1577 iscsi_get_error(iscsilun->iscsi)); 1578 goto out; 1579 } 1580 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1581 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1582 1583 out: 1584 if (task) { 1585 scsi_free_scsi_task(task); 1586 } 1587 } 1588 1589 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1590 { 1591 QemuOptsList *list; 1592 QemuOpts *opts; 1593 const char *user, *password, *password_secret, *initiator_name, 1594 *header_digest, *timeout; 1595 1596 list = qemu_find_opts("iscsi"); 1597 if (!list) { 1598 return; 1599 } 1600 1601 opts = qemu_opts_find(list, target); 1602 if (opts == NULL) { 1603 opts = QTAILQ_FIRST(&list->head); 1604 if (!opts) { 1605 return; 1606 } 1607 } 1608 1609 user = qemu_opt_get(opts, "user"); 1610 if (user) { 1611 qdict_set_default_str(options, "user", user); 1612 } 1613 1614 password = qemu_opt_get(opts, "password"); 1615 if (password) { 1616 qdict_set_default_str(options, "password", password); 1617 } 1618 1619 password_secret = qemu_opt_get(opts, "password-secret"); 1620 if (password_secret) { 1621 qdict_set_default_str(options, "password-secret", password_secret); 1622 } 1623 1624 initiator_name = qemu_opt_get(opts, "initiator-name"); 1625 if (initiator_name) { 1626 qdict_set_default_str(options, "initiator-name", initiator_name); 1627 } 1628 1629 header_digest = qemu_opt_get(opts, "header-digest"); 1630 if (header_digest) { 1631 /* -iscsi takes upper case values, but QAPI only supports lower case 1632 * enum constant names, so we have to convert here. */ 1633 char *qapi_value = g_ascii_strdown(header_digest, -1); 1634 qdict_set_default_str(options, "header-digest", qapi_value); 1635 g_free(qapi_value); 1636 } 1637 1638 timeout = qemu_opt_get(opts, "timeout"); 1639 if (timeout) { 1640 qdict_set_default_str(options, "timeout", timeout); 1641 } 1642 } 1643 1644 /* 1645 * We support iscsi url's on the form 1646 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1647 */ 1648 static void iscsi_parse_filename(const char *filename, QDict *options, 1649 Error **errp) 1650 { 1651 struct iscsi_url *iscsi_url; 1652 const char *transport_name; 1653 char *lun_str; 1654 1655 iscsi_url = iscsi_parse_full_url(NULL, filename); 1656 if (iscsi_url == NULL) { 1657 error_setg(errp, "Failed to parse URL : %s", filename); 1658 return; 1659 } 1660 1661 #if LIBISCSI_API_VERSION >= (20160603) 1662 switch (iscsi_url->transport) { 1663 case TCP_TRANSPORT: 1664 transport_name = "tcp"; 1665 break; 1666 case ISER_TRANSPORT: 1667 transport_name = "iser"; 1668 break; 1669 default: 1670 error_setg(errp, "Unknown transport type (%d)", 1671 iscsi_url->transport); 1672 return; 1673 } 1674 #else 1675 transport_name = "tcp"; 1676 #endif 1677 1678 qdict_set_default_str(options, "transport", transport_name); 1679 qdict_set_default_str(options, "portal", iscsi_url->portal); 1680 qdict_set_default_str(options, "target", iscsi_url->target); 1681 1682 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1683 qdict_set_default_str(options, "lun", lun_str); 1684 g_free(lun_str); 1685 1686 /* User/password from -iscsi take precedence over those from the URL */ 1687 iscsi_parse_iscsi_option(iscsi_url->target, options); 1688 1689 if (iscsi_url->user[0] != '\0') { 1690 qdict_set_default_str(options, "user", iscsi_url->user); 1691 qdict_set_default_str(options, "password", iscsi_url->passwd); 1692 } 1693 1694 iscsi_destroy_url(iscsi_url); 1695 } 1696 1697 static QemuOptsList runtime_opts = { 1698 .name = "iscsi", 1699 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1700 .desc = { 1701 { 1702 .name = "transport", 1703 .type = QEMU_OPT_STRING, 1704 }, 1705 { 1706 .name = "portal", 1707 .type = QEMU_OPT_STRING, 1708 }, 1709 { 1710 .name = "target", 1711 .type = QEMU_OPT_STRING, 1712 }, 1713 { 1714 .name = "user", 1715 .type = QEMU_OPT_STRING, 1716 }, 1717 { 1718 .name = "password", 1719 .type = QEMU_OPT_STRING, 1720 }, 1721 { 1722 .name = "password-secret", 1723 .type = QEMU_OPT_STRING, 1724 }, 1725 { 1726 .name = "lun", 1727 .type = QEMU_OPT_NUMBER, 1728 }, 1729 { 1730 .name = "initiator-name", 1731 .type = QEMU_OPT_STRING, 1732 }, 1733 { 1734 .name = "header-digest", 1735 .type = QEMU_OPT_STRING, 1736 }, 1737 { 1738 .name = "timeout", 1739 .type = QEMU_OPT_NUMBER, 1740 }, 1741 { /* end of list */ } 1742 }, 1743 }; 1744 1745 static void iscsi_save_designator(IscsiLun *lun, 1746 struct scsi_inquiry_device_identification *inq_di) 1747 { 1748 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1749 1750 for (desig = inq_di->designators; desig; desig = desig->next) { 1751 if (desig->association || 1752 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1753 continue; 1754 } 1755 /* NAA works better than T10 vendor ID based designator. */ 1756 if (!copy || copy->designator_type < desig->designator_type) { 1757 copy = desig; 1758 } 1759 } 1760 if (copy) { 1761 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1762 *lun->dd = *copy; 1763 lun->dd->next = NULL; 1764 lun->dd->designator = g_malloc(copy->designator_length); 1765 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1766 } 1767 } 1768 1769 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1770 Error **errp) 1771 { 1772 IscsiLun *iscsilun = bs->opaque; 1773 struct iscsi_context *iscsi = NULL; 1774 struct scsi_task *task = NULL; 1775 struct scsi_inquiry_standard *inq = NULL; 1776 struct scsi_inquiry_supported_pages *inq_vpd; 1777 char *initiator_name = NULL; 1778 QemuOpts *opts; 1779 Error *local_err = NULL; 1780 const char *transport_name, *portal, *target; 1781 #if LIBISCSI_API_VERSION >= (20160603) 1782 enum iscsi_transport_type transport; 1783 #endif 1784 int i, ret = 0, timeout = 0, lun; 1785 1786 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1787 qemu_opts_absorb_qdict(opts, options, &local_err); 1788 if (local_err) { 1789 error_propagate(errp, local_err); 1790 ret = -EINVAL; 1791 goto out; 1792 } 1793 1794 transport_name = qemu_opt_get(opts, "transport"); 1795 portal = qemu_opt_get(opts, "portal"); 1796 target = qemu_opt_get(opts, "target"); 1797 lun = qemu_opt_get_number(opts, "lun", 0); 1798 1799 if (!transport_name || !portal || !target) { 1800 error_setg(errp, "Need all of transport, portal and target options"); 1801 ret = -EINVAL; 1802 goto out; 1803 } 1804 1805 if (!strcmp(transport_name, "tcp")) { 1806 #if LIBISCSI_API_VERSION >= (20160603) 1807 transport = TCP_TRANSPORT; 1808 } else if (!strcmp(transport_name, "iser")) { 1809 transport = ISER_TRANSPORT; 1810 #else 1811 /* TCP is what older libiscsi versions always use */ 1812 #endif 1813 } else { 1814 error_setg(errp, "Unknown transport: %s", transport_name); 1815 ret = -EINVAL; 1816 goto out; 1817 } 1818 1819 memset(iscsilun, 0, sizeof(IscsiLun)); 1820 1821 initiator_name = get_initiator_name(opts); 1822 1823 iscsi = iscsi_create_context(initiator_name); 1824 if (iscsi == NULL) { 1825 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1826 ret = -ENOMEM; 1827 goto out; 1828 } 1829 #if LIBISCSI_API_VERSION >= (20160603) 1830 if (iscsi_init_transport(iscsi, transport)) { 1831 error_setg(errp, ("Error initializing transport.")); 1832 ret = -EINVAL; 1833 goto out; 1834 } 1835 #endif 1836 if (iscsi_set_targetname(iscsi, target)) { 1837 error_setg(errp, "iSCSI: Failed to set target name."); 1838 ret = -EINVAL; 1839 goto out; 1840 } 1841 1842 /* check if we got CHAP username/password via the options */ 1843 apply_chap(iscsi, opts, &local_err); 1844 if (local_err != NULL) { 1845 error_propagate(errp, local_err); 1846 ret = -EINVAL; 1847 goto out; 1848 } 1849 1850 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1851 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1852 ret = -EINVAL; 1853 goto out; 1854 } 1855 1856 /* check if we got HEADER_DIGEST via the options */ 1857 apply_header_digest(iscsi, opts, &local_err); 1858 if (local_err != NULL) { 1859 error_propagate(errp, local_err); 1860 ret = -EINVAL; 1861 goto out; 1862 } 1863 1864 /* timeout handling is broken in libiscsi before 1.15.0 */ 1865 timeout = qemu_opt_get_number(opts, "timeout", 0); 1866 #if LIBISCSI_API_VERSION >= 20150621 1867 iscsi_set_timeout(iscsi, timeout); 1868 #else 1869 if (timeout) { 1870 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1871 } 1872 #endif 1873 1874 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1875 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1876 iscsi_get_error(iscsi)); 1877 ret = -EINVAL; 1878 goto out; 1879 } 1880 1881 iscsilun->iscsi = iscsi; 1882 iscsilun->aio_context = bdrv_get_aio_context(bs); 1883 iscsilun->lun = lun; 1884 iscsilun->has_write_same = true; 1885 1886 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1887 (void **) &inq, errp); 1888 if (task == NULL) { 1889 ret = -EINVAL; 1890 goto out; 1891 } 1892 iscsilun->type = inq->periperal_device_type; 1893 scsi_free_scsi_task(task); 1894 task = NULL; 1895 1896 iscsi_modesense_sync(iscsilun); 1897 if (iscsilun->dpofua) { 1898 bs->supported_write_flags = BDRV_REQ_FUA; 1899 } 1900 1901 /* Check the write protect flag of the LUN if we want to write */ 1902 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1903 iscsilun->write_protected) { 1904 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1905 if (ret < 0) { 1906 goto out; 1907 } 1908 flags &= ~BDRV_O_RDWR; 1909 } 1910 1911 iscsi_readcapacity_sync(iscsilun, &local_err); 1912 if (local_err != NULL) { 1913 error_propagate(errp, local_err); 1914 ret = -EINVAL; 1915 goto out; 1916 } 1917 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1918 1919 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1920 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1921 * will try to read from the device to guess the image format. 1922 */ 1923 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1924 bs->sg = true; 1925 } 1926 1927 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1928 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1929 (void **) &inq_vpd, errp); 1930 if (task == NULL) { 1931 ret = -EINVAL; 1932 goto out; 1933 } 1934 for (i = 0; i < inq_vpd->num_pages; i++) { 1935 struct scsi_task *inq_task; 1936 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1937 struct scsi_inquiry_block_limits *inq_bl; 1938 struct scsi_inquiry_device_identification *inq_di; 1939 switch (inq_vpd->pages[i]) { 1940 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1941 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1942 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1943 (void **) &inq_lbp, errp); 1944 if (inq_task == NULL) { 1945 ret = -EINVAL; 1946 goto out; 1947 } 1948 memcpy(&iscsilun->lbp, inq_lbp, 1949 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1950 scsi_free_scsi_task(inq_task); 1951 break; 1952 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1953 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1954 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1955 (void **) &inq_bl, errp); 1956 if (inq_task == NULL) { 1957 ret = -EINVAL; 1958 goto out; 1959 } 1960 memcpy(&iscsilun->bl, inq_bl, 1961 sizeof(struct scsi_inquiry_block_limits)); 1962 scsi_free_scsi_task(inq_task); 1963 break; 1964 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1965 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1966 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1967 (void **) &inq_di, errp); 1968 if (inq_task == NULL) { 1969 ret = -EINVAL; 1970 goto out; 1971 } 1972 iscsi_save_designator(iscsilun, inq_di); 1973 scsi_free_scsi_task(inq_task); 1974 break; 1975 default: 1976 break; 1977 } 1978 } 1979 scsi_free_scsi_task(task); 1980 task = NULL; 1981 1982 qemu_mutex_init(&iscsilun->mutex); 1983 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1984 1985 /* Guess the internal cluster (page) size of the iscsi target by the means 1986 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1987 * reasonable size */ 1988 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1989 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1990 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 1991 iscsilun->block_size; 1992 if (iscsilun->lbprz) { 1993 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1994 } 1995 } 1996 1997 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 1998 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1999 } 2000 2001 out: 2002 qemu_opts_del(opts); 2003 g_free(initiator_name); 2004 if (task != NULL) { 2005 scsi_free_scsi_task(task); 2006 } 2007 2008 if (ret) { 2009 if (iscsi != NULL) { 2010 if (iscsi_is_logged_in(iscsi)) { 2011 iscsi_logout_sync(iscsi); 2012 } 2013 iscsi_destroy_context(iscsi); 2014 } 2015 memset(iscsilun, 0, sizeof(IscsiLun)); 2016 } 2017 2018 return ret; 2019 } 2020 2021 static void iscsi_close(BlockDriverState *bs) 2022 { 2023 IscsiLun *iscsilun = bs->opaque; 2024 struct iscsi_context *iscsi = iscsilun->iscsi; 2025 2026 iscsi_detach_aio_context(bs); 2027 if (iscsi_is_logged_in(iscsi)) { 2028 iscsi_logout_sync(iscsi); 2029 } 2030 iscsi_destroy_context(iscsi); 2031 if (iscsilun->dd) { 2032 g_free(iscsilun->dd->designator); 2033 g_free(iscsilun->dd); 2034 } 2035 g_free(iscsilun->zeroblock); 2036 iscsi_allocmap_free(iscsilun); 2037 qemu_mutex_destroy(&iscsilun->mutex); 2038 memset(iscsilun, 0, sizeof(IscsiLun)); 2039 } 2040 2041 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2042 { 2043 /* We don't actually refresh here, but just return data queried in 2044 * iscsi_open(): iscsi targets don't change their limits. */ 2045 2046 IscsiLun *iscsilun = bs->opaque; 2047 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2048 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2049 2050 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2051 2052 bs->bl.request_alignment = block_size; 2053 2054 if (iscsilun->bl.max_xfer_len) { 2055 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2056 } 2057 2058 if (max_xfer_len * block_size < INT_MAX) { 2059 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2060 } 2061 2062 if (iscsilun->lbp.lbpu) { 2063 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2064 bs->bl.max_pdiscard = 2065 iscsilun->bl.max_unmap * iscsilun->block_size; 2066 } 2067 bs->bl.pdiscard_alignment = 2068 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2069 } else { 2070 bs->bl.pdiscard_alignment = iscsilun->block_size; 2071 } 2072 2073 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2074 bs->bl.max_pwrite_zeroes = 2075 iscsilun->bl.max_ws_len * iscsilun->block_size; 2076 } 2077 if (iscsilun->lbp.lbpws) { 2078 bs->bl.pwrite_zeroes_alignment = 2079 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2080 } else { 2081 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2082 } 2083 if (iscsilun->bl.opt_xfer_len && 2084 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2085 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2086 iscsilun->block_size); 2087 } 2088 } 2089 2090 /* Note that this will not re-establish a connection with an iSCSI target - it 2091 * is effectively a NOP. */ 2092 static int iscsi_reopen_prepare(BDRVReopenState *state, 2093 BlockReopenQueue *queue, Error **errp) 2094 { 2095 IscsiLun *iscsilun = state->bs->opaque; 2096 2097 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2098 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2099 return -EACCES; 2100 } 2101 return 0; 2102 } 2103 2104 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2105 { 2106 IscsiLun *iscsilun = reopen_state->bs->opaque; 2107 2108 /* the cache.direct status might have changed */ 2109 if (iscsilun->allocmap != NULL) { 2110 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2111 } 2112 } 2113 2114 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2115 PreallocMode prealloc, Error **errp) 2116 { 2117 IscsiLun *iscsilun = bs->opaque; 2118 Error *local_err = NULL; 2119 2120 if (prealloc != PREALLOC_MODE_OFF) { 2121 error_setg(errp, "Unsupported preallocation mode '%s'", 2122 PreallocMode_str(prealloc)); 2123 return -ENOTSUP; 2124 } 2125 2126 if (iscsilun->type != TYPE_DISK) { 2127 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2128 return -ENOTSUP; 2129 } 2130 2131 iscsi_readcapacity_sync(iscsilun, &local_err); 2132 if (local_err != NULL) { 2133 error_propagate(errp, local_err); 2134 return -EIO; 2135 } 2136 2137 if (offset > iscsi_getlength(bs)) { 2138 error_setg(errp, "Cannot grow iSCSI devices"); 2139 return -EINVAL; 2140 } 2141 2142 if (iscsilun->allocmap != NULL) { 2143 iscsi_allocmap_init(iscsilun, bs->open_flags); 2144 } 2145 2146 return 0; 2147 } 2148 2149 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2150 Error **errp) 2151 { 2152 int ret = 0; 2153 int64_t total_size = 0; 2154 BlockDriverState *bs; 2155 IscsiLun *iscsilun = NULL; 2156 QDict *bs_options; 2157 Error *local_err = NULL; 2158 2159 bs = bdrv_new(); 2160 2161 /* Read out options */ 2162 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2163 BDRV_SECTOR_SIZE); 2164 bs->opaque = g_new0(struct IscsiLun, 1); 2165 iscsilun = bs->opaque; 2166 2167 bs_options = qdict_new(); 2168 iscsi_parse_filename(filename, bs_options, &local_err); 2169 if (local_err) { 2170 error_propagate(errp, local_err); 2171 ret = -EINVAL; 2172 } else { 2173 ret = iscsi_open(bs, bs_options, 0, NULL); 2174 } 2175 qobject_unref(bs_options); 2176 2177 if (ret != 0) { 2178 goto out; 2179 } 2180 iscsi_detach_aio_context(bs); 2181 if (iscsilun->type != TYPE_DISK) { 2182 ret = -ENODEV; 2183 goto out; 2184 } 2185 if (bs->total_sectors < total_size) { 2186 ret = -ENOSPC; 2187 goto out; 2188 } 2189 2190 ret = 0; 2191 out: 2192 if (iscsilun->iscsi != NULL) { 2193 iscsi_destroy_context(iscsilun->iscsi); 2194 } 2195 g_free(bs->opaque); 2196 bs->opaque = NULL; 2197 bdrv_unref(bs); 2198 return ret; 2199 } 2200 2201 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2202 { 2203 IscsiLun *iscsilun = bs->opaque; 2204 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2205 bdi->cluster_size = iscsilun->cluster_size; 2206 return 0; 2207 } 2208 2209 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2210 Error **errp) 2211 { 2212 IscsiLun *iscsilun = bs->opaque; 2213 iscsi_allocmap_invalidate(iscsilun); 2214 } 2215 2216 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2217 BdrvChild *src, 2218 uint64_t src_offset, 2219 BdrvChild *dst, 2220 uint64_t dst_offset, 2221 uint64_t bytes, 2222 BdrvRequestFlags read_flags, 2223 BdrvRequestFlags write_flags) 2224 { 2225 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2226 read_flags, write_flags); 2227 } 2228 2229 static struct scsi_task *iscsi_xcopy_task(int param_len) 2230 { 2231 struct scsi_task *task; 2232 2233 task = g_new0(struct scsi_task, 1); 2234 2235 task->cdb[0] = EXTENDED_COPY; 2236 task->cdb[10] = (param_len >> 24) & 0xFF; 2237 task->cdb[11] = (param_len >> 16) & 0xFF; 2238 task->cdb[12] = (param_len >> 8) & 0xFF; 2239 task->cdb[13] = param_len & 0xFF; 2240 task->cdb_size = 16; 2241 task->xfer_dir = SCSI_XFER_WRITE; 2242 task->expxferlen = param_len; 2243 2244 return task; 2245 } 2246 2247 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2248 { 2249 struct scsi_inquiry_device_designator *dd = lun->dd; 2250 2251 memset(desc, 0, 32); 2252 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2253 desc[4] = dd->code_set; 2254 desc[5] = (dd->designator_type & 0xF) 2255 | ((dd->association & 3) << 4); 2256 desc[7] = dd->designator_length; 2257 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2258 2259 desc[28] = 0; 2260 desc[29] = (lun->block_size >> 16) & 0xFF; 2261 desc[30] = (lun->block_size >> 8) & 0xFF; 2262 desc[31] = lun->block_size & 0xFF; 2263 } 2264 2265 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2266 int dst_index) 2267 { 2268 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2269 hdr[1] = ((dc << 1) | cat) & 0xFF; 2270 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2271 /* don't account for the first 4 bytes in descriptor header*/ 2272 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2273 hdr[4] = (src_index >> 8) & 0xFF; 2274 hdr[5] = src_index & 0xFF; 2275 hdr[6] = (dst_index >> 8) & 0xFF; 2276 hdr[7] = dst_index & 0xFF; 2277 } 2278 2279 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2280 int src_index, int dst_index, int num_blks, 2281 uint64_t src_lba, uint64_t dst_lba) 2282 { 2283 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2284 2285 /* The caller should verify the request size */ 2286 assert(num_blks < 65536); 2287 desc[10] = (num_blks >> 8) & 0xFF; 2288 desc[11] = num_blks & 0xFF; 2289 desc[12] = (src_lba >> 56) & 0xFF; 2290 desc[13] = (src_lba >> 48) & 0xFF; 2291 desc[14] = (src_lba >> 40) & 0xFF; 2292 desc[15] = (src_lba >> 32) & 0xFF; 2293 desc[16] = (src_lba >> 24) & 0xFF; 2294 desc[17] = (src_lba >> 16) & 0xFF; 2295 desc[18] = (src_lba >> 8) & 0xFF; 2296 desc[19] = src_lba & 0xFF; 2297 desc[20] = (dst_lba >> 56) & 0xFF; 2298 desc[21] = (dst_lba >> 48) & 0xFF; 2299 desc[22] = (dst_lba >> 40) & 0xFF; 2300 desc[23] = (dst_lba >> 32) & 0xFF; 2301 desc[24] = (dst_lba >> 24) & 0xFF; 2302 desc[25] = (dst_lba >> 16) & 0xFF; 2303 desc[26] = (dst_lba >> 8) & 0xFF; 2304 desc[27] = dst_lba & 0xFF; 2305 } 2306 2307 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2308 int list_id_usage, int prio, 2309 int tgt_desc_len, 2310 int seg_desc_len, int inline_data_len) 2311 { 2312 buf[0] = list_id; 2313 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2314 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2315 buf[3] = tgt_desc_len & 0xFF; 2316 buf[8] = (seg_desc_len >> 24) & 0xFF; 2317 buf[9] = (seg_desc_len >> 16) & 0xFF; 2318 buf[10] = (seg_desc_len >> 8) & 0xFF; 2319 buf[11] = seg_desc_len & 0xFF; 2320 buf[12] = (inline_data_len >> 24) & 0xFF; 2321 buf[13] = (inline_data_len >> 16) & 0xFF; 2322 buf[14] = (inline_data_len >> 8) & 0xFF; 2323 buf[15] = inline_data_len & 0xFF; 2324 } 2325 2326 static void iscsi_xcopy_data(struct iscsi_data *data, 2327 IscsiLun *src, int64_t src_lba, 2328 IscsiLun *dst, int64_t dst_lba, 2329 uint16_t num_blocks) 2330 { 2331 uint8_t *buf; 2332 const int src_offset = XCOPY_DESC_OFFSET; 2333 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2334 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2335 2336 data->size = XCOPY_DESC_OFFSET + 2337 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2338 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2339 data->data = g_malloc0(data->size); 2340 buf = data->data; 2341 2342 /* Initialise the parameter list header */ 2343 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2344 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2345 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2346 0); 2347 2348 /* Initialise CSCD list with one src + one dst descriptor */ 2349 iscsi_populate_target_desc(&buf[src_offset], src); 2350 iscsi_populate_target_desc(&buf[dst_offset], dst); 2351 2352 /* Initialise one segment descriptor */ 2353 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2354 src_lba, dst_lba); 2355 } 2356 2357 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2358 BdrvChild *src, 2359 uint64_t src_offset, 2360 BdrvChild *dst, 2361 uint64_t dst_offset, 2362 uint64_t bytes, 2363 BdrvRequestFlags read_flags, 2364 BdrvRequestFlags write_flags) 2365 { 2366 IscsiLun *dst_lun = dst->bs->opaque; 2367 IscsiLun *src_lun; 2368 struct IscsiTask iscsi_task; 2369 struct iscsi_data data; 2370 int r = 0; 2371 int block_size; 2372 2373 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2374 return -ENOTSUP; 2375 } 2376 src_lun = src->bs->opaque; 2377 2378 if (!src_lun->dd || !dst_lun->dd) { 2379 return -ENOTSUP; 2380 } 2381 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2382 return -ENOTSUP; 2383 } 2384 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2385 return -ENOTSUP; 2386 } 2387 if (dst_lun->block_size != src_lun->block_size || 2388 !dst_lun->block_size) { 2389 return -ENOTSUP; 2390 } 2391 2392 block_size = dst_lun->block_size; 2393 if (bytes / block_size > 65535) { 2394 return -ENOTSUP; 2395 } 2396 2397 iscsi_xcopy_data(&data, 2398 src_lun, src_offset / block_size, 2399 dst_lun, dst_offset / block_size, 2400 bytes / block_size); 2401 2402 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2403 2404 qemu_mutex_lock(&dst_lun->mutex); 2405 iscsi_task.task = iscsi_xcopy_task(data.size); 2406 retry: 2407 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2408 iscsi_task.task, iscsi_co_generic_cb, 2409 &data, 2410 &iscsi_task) != 0) { 2411 r = -EIO; 2412 goto out_unlock; 2413 } 2414 2415 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2416 2417 if (iscsi_task.do_retry) { 2418 iscsi_task.complete = 0; 2419 goto retry; 2420 } 2421 2422 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2423 r = iscsi_task.err_code; 2424 goto out_unlock; 2425 } 2426 2427 out_unlock: 2428 2429 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2430 g_free(iscsi_task.task); 2431 qemu_mutex_unlock(&dst_lun->mutex); 2432 g_free(iscsi_task.err_str); 2433 return r; 2434 } 2435 2436 static QemuOptsList iscsi_create_opts = { 2437 .name = "iscsi-create-opts", 2438 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2439 .desc = { 2440 { 2441 .name = BLOCK_OPT_SIZE, 2442 .type = QEMU_OPT_SIZE, 2443 .help = "Virtual disk size" 2444 }, 2445 { /* end of list */ } 2446 } 2447 }; 2448 2449 static BlockDriver bdrv_iscsi = { 2450 .format_name = "iscsi", 2451 .protocol_name = "iscsi", 2452 2453 .instance_size = sizeof(IscsiLun), 2454 .bdrv_parse_filename = iscsi_parse_filename, 2455 .bdrv_file_open = iscsi_open, 2456 .bdrv_close = iscsi_close, 2457 .bdrv_co_create_opts = iscsi_co_create_opts, 2458 .create_opts = &iscsi_create_opts, 2459 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2460 .bdrv_reopen_commit = iscsi_reopen_commit, 2461 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2462 2463 .bdrv_getlength = iscsi_getlength, 2464 .bdrv_get_info = iscsi_get_info, 2465 .bdrv_co_truncate = iscsi_co_truncate, 2466 .bdrv_refresh_limits = iscsi_refresh_limits, 2467 2468 .bdrv_co_block_status = iscsi_co_block_status, 2469 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2470 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2471 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2472 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2473 .bdrv_co_readv = iscsi_co_readv, 2474 .bdrv_co_writev = iscsi_co_writev, 2475 .bdrv_co_flush_to_disk = iscsi_co_flush, 2476 2477 #ifdef __linux__ 2478 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2479 #endif 2480 2481 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2482 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2483 }; 2484 2485 #if LIBISCSI_API_VERSION >= (20160603) 2486 static BlockDriver bdrv_iser = { 2487 .format_name = "iser", 2488 .protocol_name = "iser", 2489 2490 .instance_size = sizeof(IscsiLun), 2491 .bdrv_parse_filename = iscsi_parse_filename, 2492 .bdrv_file_open = iscsi_open, 2493 .bdrv_close = iscsi_close, 2494 .bdrv_co_create_opts = iscsi_co_create_opts, 2495 .create_opts = &iscsi_create_opts, 2496 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2497 .bdrv_reopen_commit = iscsi_reopen_commit, 2498 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2499 2500 .bdrv_getlength = iscsi_getlength, 2501 .bdrv_get_info = iscsi_get_info, 2502 .bdrv_co_truncate = iscsi_co_truncate, 2503 .bdrv_refresh_limits = iscsi_refresh_limits, 2504 2505 .bdrv_co_block_status = iscsi_co_block_status, 2506 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2507 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2508 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2509 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2510 .bdrv_co_readv = iscsi_co_readv, 2511 .bdrv_co_writev = iscsi_co_writev, 2512 .bdrv_co_flush_to_disk = iscsi_co_flush, 2513 2514 #ifdef __linux__ 2515 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2516 #endif 2517 2518 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2519 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2520 }; 2521 #endif 2522 2523 static void iscsi_block_init(void) 2524 { 2525 bdrv_register(&bdrv_iscsi); 2526 #if LIBISCSI_API_VERSION >= (20160603) 2527 bdrv_register(&bdrv_iser); 2528 #endif 2529 } 2530 2531 block_init(iscsi_block_init); 2532