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 "qapi/error.h" 44 #include "qapi/qapi-commands-misc.h" 45 #include "qapi/qmp/qdict.h" 46 #include "qapi/qmp/qstring.h" 47 #include "crypto/secret.h" 48 #include "scsi/utils.h" 49 #include "trace.h" 50 51 /* Conflict between scsi/utils.h and libiscsi! :( */ 52 #define SCSI_XFER_NONE ISCSI_XFER_NONE 53 #include <iscsi/iscsi.h> 54 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */ 55 #include <iscsi/scsi-lowlevel.h> 56 #undef inline 57 #undef SCSI_XFER_NONE 58 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 59 60 #ifdef __linux__ 61 #include <scsi/sg.h> 62 #endif 63 64 typedef struct IscsiLun { 65 struct iscsi_context *iscsi; 66 AioContext *aio_context; 67 int lun; 68 enum scsi_inquiry_peripheral_device_type type; 69 int block_size; 70 uint64_t num_blocks; 71 int events; 72 QEMUTimer *nop_timer; 73 QEMUTimer *event_timer; 74 QemuMutex mutex; 75 struct scsi_inquiry_logical_block_provisioning lbp; 76 struct scsi_inquiry_block_limits bl; 77 struct scsi_inquiry_device_designator *dd; 78 unsigned char *zeroblock; 79 /* The allocmap tracks which clusters (pages) on the iSCSI target are 80 * allocated and which are not. In case a target returns zeros for 81 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 82 * of reading zeros over the wire if a read request falls within an 83 * unallocated block. As there are 3 possible states we need 2 bitmaps to 84 * track. allocmap_valid keeps track if QEMU's information about a page is 85 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 86 * valid information about a page the corresponding allocmap entry should be 87 * switched to unallocated as well to force a new lookup of the allocation 88 * status as lookups are generally skipped if a page is suspect to be 89 * allocated. If a iSCSI target is opened with cache.direct = on the 90 * allocmap_valid does not exist turning all cached information invalid so 91 * that a fresh lookup is made for any page even if allocmap entry returns 92 * it's unallocated. */ 93 unsigned long *allocmap; 94 unsigned long *allocmap_valid; 95 long allocmap_size; 96 int cluster_size; 97 bool use_16_for_rw; 98 bool write_protected; 99 bool lbpme; 100 bool lbprz; 101 bool dpofua; 102 bool has_write_same; 103 bool request_timed_out; 104 } IscsiLun; 105 106 typedef struct IscsiTask { 107 int status; 108 int complete; 109 int retries; 110 int do_retry; 111 struct scsi_task *task; 112 Coroutine *co; 113 IscsiLun *iscsilun; 114 QEMUTimer retry_timer; 115 int err_code; 116 char *err_str; 117 } IscsiTask; 118 119 typedef struct IscsiAIOCB { 120 BlockAIOCB common; 121 QEMUBH *bh; 122 IscsiLun *iscsilun; 123 struct scsi_task *task; 124 int status; 125 int64_t sector_num; 126 int nb_sectors; 127 int ret; 128 #ifdef __linux__ 129 sg_io_hdr_t *ioh; 130 #endif 131 bool cancelled; 132 } IscsiAIOCB; 133 134 /* libiscsi uses time_t so its enough to process events every second */ 135 #define EVENT_INTERVAL 1000 136 #define NOP_INTERVAL 5000 137 #define MAX_NOP_FAILURES 3 138 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 139 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 140 141 /* this threshold is a trade-off knob to choose between 142 * the potential additional overhead of an extra GET_LBA_STATUS request 143 * vs. unnecessarily reading a lot of zero sectors over the wire. 144 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 145 * sectors we check the allocation status of the area covered by the 146 * request first if the allocationmap indicates that the area might be 147 * unallocated. */ 148 #define ISCSI_CHECKALLOC_THRES 64 149 150 #ifdef __linux__ 151 152 static void 153 iscsi_bh_cb(void *p) 154 { 155 IscsiAIOCB *acb = p; 156 157 qemu_bh_delete(acb->bh); 158 159 acb->common.cb(acb->common.opaque, acb->status); 160 161 if (acb->task != NULL) { 162 scsi_free_scsi_task(acb->task); 163 acb->task = NULL; 164 } 165 166 qemu_aio_unref(acb); 167 } 168 169 static void 170 iscsi_schedule_bh(IscsiAIOCB *acb) 171 { 172 if (acb->bh) { 173 return; 174 } 175 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 176 qemu_bh_schedule(acb->bh); 177 } 178 179 #endif 180 181 static void iscsi_co_generic_bh_cb(void *opaque) 182 { 183 struct IscsiTask *iTask = opaque; 184 185 iTask->complete = 1; 186 aio_co_wake(iTask->co); 187 } 188 189 static void iscsi_retry_timer_expired(void *opaque) 190 { 191 struct IscsiTask *iTask = opaque; 192 iTask->complete = 1; 193 if (iTask->co) { 194 aio_co_wake(iTask->co); 195 } 196 } 197 198 static inline unsigned exp_random(double mean) 199 { 200 return -mean * log((double)rand() / RAND_MAX); 201 } 202 203 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 204 * libiscsi 1.10.0, together with other constants we need. Use it as 205 * a hint that we have to define them ourselves if needed, to keep the 206 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 207 * the test because SCSI_STATUS_* is an enum. 208 * 209 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 210 * an enum, check against the LIBISCSI_API_VERSION macro, which was 211 * introduced in 1.11.0. If it is present, there is no need to define 212 * anything. 213 */ 214 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 215 !defined(LIBISCSI_API_VERSION) 216 #define SCSI_STATUS_TASK_SET_FULL 0x28 217 #define SCSI_STATUS_TIMEOUT 0x0f000002 218 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 219 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 220 #endif 221 222 #ifndef LIBISCSI_API_VERSION 223 #define LIBISCSI_API_VERSION 20130701 224 #endif 225 226 static int iscsi_translate_sense(struct scsi_sense *sense) 227 { 228 return - scsi_sense_to_errno(sense->key, 229 (sense->ascq & 0xFF00) >> 8, 230 sense->ascq & 0xFF); 231 } 232 233 /* Called (via iscsi_service) with QemuMutex held. */ 234 static void 235 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 236 void *command_data, void *opaque) 237 { 238 struct IscsiTask *iTask = opaque; 239 struct scsi_task *task = command_data; 240 241 iTask->status = status; 242 iTask->do_retry = 0; 243 iTask->task = task; 244 245 if (status != SCSI_STATUS_GOOD) { 246 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 247 if (status == SCSI_STATUS_CHECK_CONDITION 248 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 249 error_report("iSCSI CheckCondition: %s", 250 iscsi_get_error(iscsi)); 251 iTask->do_retry = 1; 252 goto out; 253 } 254 if (status == SCSI_STATUS_BUSY || 255 status == SCSI_STATUS_TIMEOUT || 256 status == SCSI_STATUS_TASK_SET_FULL) { 257 unsigned retry_time = 258 exp_random(iscsi_retry_times[iTask->retries - 1]); 259 if (status == SCSI_STATUS_TIMEOUT) { 260 /* make sure the request is rescheduled AFTER the 261 * reconnect is initiated */ 262 retry_time = EVENT_INTERVAL * 2; 263 iTask->iscsilun->request_timed_out = true; 264 } 265 error_report("iSCSI Busy/TaskSetFull/TimeOut" 266 " (retry #%u in %u ms): %s", 267 iTask->retries, retry_time, 268 iscsi_get_error(iscsi)); 269 aio_timer_init(iTask->iscsilun->aio_context, 270 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 271 SCALE_MS, iscsi_retry_timer_expired, iTask); 272 timer_mod(&iTask->retry_timer, 273 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 274 iTask->do_retry = 1; 275 return; 276 } 277 } 278 iTask->err_code = iscsi_translate_sense(&task->sense); 279 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 280 } 281 282 out: 283 if (iTask->co) { 284 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 285 iscsi_co_generic_bh_cb, iTask); 286 } else { 287 iTask->complete = 1; 288 } 289 } 290 291 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 292 { 293 *iTask = (struct IscsiTask) { 294 .co = qemu_coroutine_self(), 295 .iscsilun = iscsilun, 296 }; 297 } 298 299 #ifdef __linux__ 300 301 /* Called (via iscsi_service) with QemuMutex held. */ 302 static void 303 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 304 void *private_data) 305 { 306 IscsiAIOCB *acb = private_data; 307 308 /* If the command callback hasn't been called yet, drop the task */ 309 if (!acb->bh) { 310 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 311 iscsi_scsi_cancel_task(iscsi, acb->task); 312 } 313 314 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 315 } 316 317 static void 318 iscsi_aio_cancel(BlockAIOCB *blockacb) 319 { 320 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 321 IscsiLun *iscsilun = acb->iscsilun; 322 323 qemu_mutex_lock(&iscsilun->mutex); 324 325 /* If it was cancelled or completed already, our work is done here */ 326 if (acb->cancelled || acb->status != -EINPROGRESS) { 327 qemu_mutex_unlock(&iscsilun->mutex); 328 return; 329 } 330 331 acb->cancelled = true; 332 333 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 334 335 /* send a task mgmt call to the target to cancel the task on the target */ 336 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 337 iscsi_abort_task_cb, acb) < 0) { 338 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 339 } 340 341 qemu_mutex_unlock(&iscsilun->mutex); 342 } 343 344 static const AIOCBInfo iscsi_aiocb_info = { 345 .aiocb_size = sizeof(IscsiAIOCB), 346 .cancel_async = iscsi_aio_cancel, 347 }; 348 349 #endif 350 351 static void iscsi_process_read(void *arg); 352 static void iscsi_process_write(void *arg); 353 354 /* Called with QemuMutex held. */ 355 static void 356 iscsi_set_events(IscsiLun *iscsilun) 357 { 358 struct iscsi_context *iscsi = iscsilun->iscsi; 359 int ev = iscsi_which_events(iscsi); 360 361 if (ev != iscsilun->events) { 362 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 363 false, 364 (ev & POLLIN) ? iscsi_process_read : NULL, 365 (ev & POLLOUT) ? iscsi_process_write : NULL, 366 NULL, 367 iscsilun); 368 iscsilun->events = ev; 369 } 370 } 371 372 static void iscsi_timed_check_events(void *opaque) 373 { 374 IscsiLun *iscsilun = opaque; 375 376 qemu_mutex_lock(&iscsilun->mutex); 377 378 /* check for timed out requests */ 379 iscsi_service(iscsilun->iscsi, 0); 380 381 if (iscsilun->request_timed_out) { 382 iscsilun->request_timed_out = false; 383 iscsi_reconnect(iscsilun->iscsi); 384 } 385 386 /* newer versions of libiscsi may return zero events. Ensure we are able 387 * to return to service once this situation changes. */ 388 iscsi_set_events(iscsilun); 389 390 qemu_mutex_unlock(&iscsilun->mutex); 391 392 timer_mod(iscsilun->event_timer, 393 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 394 } 395 396 static void 397 iscsi_process_read(void *arg) 398 { 399 IscsiLun *iscsilun = arg; 400 struct iscsi_context *iscsi = iscsilun->iscsi; 401 402 qemu_mutex_lock(&iscsilun->mutex); 403 iscsi_service(iscsi, POLLIN); 404 iscsi_set_events(iscsilun); 405 qemu_mutex_unlock(&iscsilun->mutex); 406 } 407 408 static void 409 iscsi_process_write(void *arg) 410 { 411 IscsiLun *iscsilun = arg; 412 struct iscsi_context *iscsi = iscsilun->iscsi; 413 414 qemu_mutex_lock(&iscsilun->mutex); 415 iscsi_service(iscsi, POLLOUT); 416 iscsi_set_events(iscsilun); 417 qemu_mutex_unlock(&iscsilun->mutex); 418 } 419 420 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 421 { 422 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 423 } 424 425 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 426 { 427 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 428 } 429 430 static bool is_byte_request_lun_aligned(int64_t offset, int count, 431 IscsiLun *iscsilun) 432 { 433 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 434 error_report("iSCSI misaligned request: " 435 "iscsilun->block_size %u, offset %" PRIi64 436 ", count %d", 437 iscsilun->block_size, offset, count); 438 return false; 439 } 440 return true; 441 } 442 443 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 444 IscsiLun *iscsilun) 445 { 446 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 447 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 448 nb_sectors << BDRV_SECTOR_BITS, 449 iscsilun); 450 } 451 452 static void iscsi_allocmap_free(IscsiLun *iscsilun) 453 { 454 g_free(iscsilun->allocmap); 455 g_free(iscsilun->allocmap_valid); 456 iscsilun->allocmap = NULL; 457 iscsilun->allocmap_valid = NULL; 458 } 459 460 461 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 462 { 463 iscsi_allocmap_free(iscsilun); 464 465 assert(iscsilun->cluster_size); 466 iscsilun->allocmap_size = 467 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 468 iscsilun->cluster_size); 469 470 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 471 if (!iscsilun->allocmap) { 472 return -ENOMEM; 473 } 474 475 if (open_flags & BDRV_O_NOCACHE) { 476 /* when cache.direct = on all allocmap entries are 477 * treated as invalid to force a relookup of the block 478 * status on every read request */ 479 return 0; 480 } 481 482 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 483 if (!iscsilun->allocmap_valid) { 484 /* if we are under memory pressure free the allocmap as well */ 485 iscsi_allocmap_free(iscsilun); 486 return -ENOMEM; 487 } 488 489 return 0; 490 } 491 492 static void 493 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 494 int64_t bytes, bool allocated, bool valid) 495 { 496 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 497 498 if (iscsilun->allocmap == NULL) { 499 return; 500 } 501 /* expand to entirely contain all affected clusters */ 502 assert(iscsilun->cluster_size); 503 cl_num_expanded = offset / iscsilun->cluster_size; 504 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 505 iscsilun->cluster_size) - cl_num_expanded; 506 /* shrink to touch only completely contained clusters */ 507 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 508 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 509 if (allocated) { 510 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 511 } else { 512 if (nb_cls_shrunk > 0) { 513 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 514 } 515 } 516 517 if (iscsilun->allocmap_valid == NULL) { 518 return; 519 } 520 if (valid) { 521 if (nb_cls_shrunk > 0) { 522 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 523 } 524 } else { 525 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 526 nb_cls_expanded); 527 } 528 } 529 530 static void 531 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 532 int64_t bytes) 533 { 534 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 535 } 536 537 static void 538 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 539 int64_t bytes) 540 { 541 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 542 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 543 */ 544 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 545 } 546 547 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 548 int64_t bytes) 549 { 550 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 551 } 552 553 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 554 { 555 if (iscsilun->allocmap) { 556 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 557 } 558 if (iscsilun->allocmap_valid) { 559 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 560 } 561 } 562 563 static inline bool 564 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 565 int64_t bytes) 566 { 567 unsigned long size; 568 if (iscsilun->allocmap == NULL) { 569 return true; 570 } 571 assert(iscsilun->cluster_size); 572 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 573 return !(find_next_bit(iscsilun->allocmap, size, 574 offset / iscsilun->cluster_size) == size); 575 } 576 577 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 578 int64_t offset, int64_t bytes) 579 { 580 unsigned long size; 581 if (iscsilun->allocmap_valid == NULL) { 582 return false; 583 } 584 assert(iscsilun->cluster_size); 585 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 586 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 587 offset / iscsilun->cluster_size) == size); 588 } 589 590 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 591 IscsiLun *iscsilun) 592 { 593 while (!iTask->complete) { 594 iscsi_set_events(iscsilun); 595 qemu_mutex_unlock(&iscsilun->mutex); 596 qemu_coroutine_yield(); 597 qemu_mutex_lock(&iscsilun->mutex); 598 } 599 } 600 601 static int coroutine_fn 602 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 603 QEMUIOVector *iov, int flags) 604 { 605 IscsiLun *iscsilun = bs->opaque; 606 struct IscsiTask iTask; 607 uint64_t lba; 608 uint32_t num_sectors; 609 bool fua = flags & BDRV_REQ_FUA; 610 int r = 0; 611 612 if (fua) { 613 assert(iscsilun->dpofua); 614 } 615 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 616 return -EINVAL; 617 } 618 619 if (bs->bl.max_transfer) { 620 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 621 } 622 623 lba = sector_qemu2lun(sector_num, iscsilun); 624 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 625 iscsi_co_init_iscsitask(iscsilun, &iTask); 626 qemu_mutex_lock(&iscsilun->mutex); 627 retry: 628 if (iscsilun->use_16_for_rw) { 629 #if LIBISCSI_API_VERSION >= (20160603) 630 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 631 NULL, num_sectors * iscsilun->block_size, 632 iscsilun->block_size, 0, 0, fua, 0, 0, 633 iscsi_co_generic_cb, &iTask, 634 (struct scsi_iovec *)iov->iov, iov->niov); 635 } else { 636 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 637 NULL, num_sectors * iscsilun->block_size, 638 iscsilun->block_size, 0, 0, fua, 0, 0, 639 iscsi_co_generic_cb, &iTask, 640 (struct scsi_iovec *)iov->iov, iov->niov); 641 } 642 #else 643 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 644 NULL, num_sectors * iscsilun->block_size, 645 iscsilun->block_size, 0, 0, fua, 0, 0, 646 iscsi_co_generic_cb, &iTask); 647 } else { 648 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 649 NULL, num_sectors * iscsilun->block_size, 650 iscsilun->block_size, 0, 0, fua, 0, 0, 651 iscsi_co_generic_cb, &iTask); 652 } 653 #endif 654 if (iTask.task == NULL) { 655 qemu_mutex_unlock(&iscsilun->mutex); 656 return -ENOMEM; 657 } 658 #if LIBISCSI_API_VERSION < (20160603) 659 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 660 iov->niov); 661 #endif 662 iscsi_co_wait_for_task(&iTask, iscsilun); 663 664 if (iTask.task != NULL) { 665 scsi_free_scsi_task(iTask.task); 666 iTask.task = NULL; 667 } 668 669 if (iTask.do_retry) { 670 iTask.complete = 0; 671 goto retry; 672 } 673 674 if (iTask.status != SCSI_STATUS_GOOD) { 675 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 676 nb_sectors * BDRV_SECTOR_SIZE); 677 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 678 iTask.err_str); 679 r = iTask.err_code; 680 goto out_unlock; 681 } 682 683 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 684 nb_sectors * BDRV_SECTOR_SIZE); 685 686 out_unlock: 687 qemu_mutex_unlock(&iscsilun->mutex); 688 g_free(iTask.err_str); 689 return r; 690 } 691 692 693 694 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 695 bool want_zero, int64_t offset, 696 int64_t bytes, int64_t *pnum, 697 int64_t *map, 698 BlockDriverState **file) 699 { 700 IscsiLun *iscsilun = bs->opaque; 701 struct scsi_get_lba_status *lbas = NULL; 702 struct scsi_lba_status_descriptor *lbasd = NULL; 703 struct IscsiTask iTask; 704 uint64_t lba; 705 int ret; 706 707 iscsi_co_init_iscsitask(iscsilun, &iTask); 708 709 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 710 711 /* default to all sectors allocated */ 712 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 713 if (map) { 714 *map = offset; 715 } 716 *pnum = bytes; 717 718 /* LUN does not support logical block provisioning */ 719 if (!iscsilun->lbpme) { 720 goto out; 721 } 722 723 lba = offset / iscsilun->block_size; 724 725 qemu_mutex_lock(&iscsilun->mutex); 726 retry: 727 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 728 lba, 8 + 16, iscsi_co_generic_cb, 729 &iTask) == NULL) { 730 ret = -ENOMEM; 731 goto out_unlock; 732 } 733 iscsi_co_wait_for_task(&iTask, iscsilun); 734 735 if (iTask.do_retry) { 736 if (iTask.task != NULL) { 737 scsi_free_scsi_task(iTask.task); 738 iTask.task = NULL; 739 } 740 iTask.complete = 0; 741 goto retry; 742 } 743 744 if (iTask.status != SCSI_STATUS_GOOD) { 745 /* in case the get_lba_status_callout fails (i.e. 746 * because the device is busy or the cmd is not 747 * supported) we pretend all blocks are allocated 748 * for backwards compatibility */ 749 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 750 lba, iTask.err_str); 751 goto out_unlock; 752 } 753 754 lbas = scsi_datain_unmarshall(iTask.task); 755 if (lbas == NULL) { 756 ret = -EIO; 757 goto out_unlock; 758 } 759 760 lbasd = &lbas->descriptors[0]; 761 762 if (lba != lbasd->lba) { 763 ret = -EIO; 764 goto out_unlock; 765 } 766 767 *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size; 768 769 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 770 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 771 ret &= ~BDRV_BLOCK_DATA; 772 if (iscsilun->lbprz) { 773 ret |= BDRV_BLOCK_ZERO; 774 } 775 } 776 777 if (ret & BDRV_BLOCK_ZERO) { 778 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 779 } else { 780 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 781 } 782 783 if (*pnum > bytes) { 784 *pnum = bytes; 785 } 786 out_unlock: 787 qemu_mutex_unlock(&iscsilun->mutex); 788 g_free(iTask.err_str); 789 out: 790 if (iTask.task != NULL) { 791 scsi_free_scsi_task(iTask.task); 792 } 793 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 794 *file = bs; 795 } 796 return ret; 797 } 798 799 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 800 int64_t sector_num, int nb_sectors, 801 QEMUIOVector *iov) 802 { 803 IscsiLun *iscsilun = bs->opaque; 804 struct IscsiTask iTask; 805 uint64_t lba; 806 uint32_t num_sectors; 807 int r = 0; 808 809 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 810 return -EINVAL; 811 } 812 813 if (bs->bl.max_transfer) { 814 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 815 } 816 817 /* if cache.direct is off and we have a valid entry in our allocation map 818 * we can skip checking the block status and directly return zeroes if 819 * the request falls within an unallocated area */ 820 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 821 nb_sectors * BDRV_SECTOR_SIZE) && 822 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 823 nb_sectors * BDRV_SECTOR_SIZE)) { 824 qemu_iovec_memset(iov, 0, 0x00, iov->size); 825 return 0; 826 } 827 828 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 829 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 830 nb_sectors * BDRV_SECTOR_SIZE) && 831 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 832 nb_sectors * BDRV_SECTOR_SIZE)) { 833 int64_t pnum; 834 /* check the block status from the beginning of the cluster 835 * containing the start sector */ 836 int64_t head; 837 int ret; 838 839 assert(iscsilun->cluster_size); 840 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 841 ret = iscsi_co_block_status(bs, true, 842 sector_num * BDRV_SECTOR_SIZE - head, 843 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 844 if (ret < 0) { 845 return ret; 846 } 847 /* if the whole request falls into an unallocated area we can avoid 848 * reading and directly return zeroes instead */ 849 if (ret & BDRV_BLOCK_ZERO && 850 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 851 qemu_iovec_memset(iov, 0, 0x00, iov->size); 852 return 0; 853 } 854 } 855 856 lba = sector_qemu2lun(sector_num, iscsilun); 857 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 858 859 iscsi_co_init_iscsitask(iscsilun, &iTask); 860 qemu_mutex_lock(&iscsilun->mutex); 861 retry: 862 if (iscsilun->use_16_for_rw) { 863 #if LIBISCSI_API_VERSION >= (20160603) 864 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 865 num_sectors * iscsilun->block_size, 866 iscsilun->block_size, 0, 0, 0, 0, 0, 867 iscsi_co_generic_cb, &iTask, 868 (struct scsi_iovec *)iov->iov, iov->niov); 869 } else { 870 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 871 num_sectors * iscsilun->block_size, 872 iscsilun->block_size, 873 0, 0, 0, 0, 0, 874 iscsi_co_generic_cb, &iTask, 875 (struct scsi_iovec *)iov->iov, iov->niov); 876 } 877 #else 878 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 879 num_sectors * iscsilun->block_size, 880 iscsilun->block_size, 0, 0, 0, 0, 0, 881 iscsi_co_generic_cb, &iTask); 882 } else { 883 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 884 num_sectors * iscsilun->block_size, 885 iscsilun->block_size, 886 0, 0, 0, 0, 0, 887 iscsi_co_generic_cb, &iTask); 888 } 889 #endif 890 if (iTask.task == NULL) { 891 qemu_mutex_unlock(&iscsilun->mutex); 892 return -ENOMEM; 893 } 894 #if LIBISCSI_API_VERSION < (20160603) 895 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 896 #endif 897 898 iscsi_co_wait_for_task(&iTask, iscsilun); 899 if (iTask.task != NULL) { 900 scsi_free_scsi_task(iTask.task); 901 iTask.task = NULL; 902 } 903 904 if (iTask.do_retry) { 905 iTask.complete = 0; 906 goto retry; 907 } 908 909 if (iTask.status != SCSI_STATUS_GOOD) { 910 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 911 lba, iTask.err_str); 912 r = iTask.err_code; 913 } 914 915 qemu_mutex_unlock(&iscsilun->mutex); 916 g_free(iTask.err_str); 917 return r; 918 } 919 920 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 921 { 922 IscsiLun *iscsilun = bs->opaque; 923 struct IscsiTask iTask; 924 int r = 0; 925 926 iscsi_co_init_iscsitask(iscsilun, &iTask); 927 qemu_mutex_lock(&iscsilun->mutex); 928 retry: 929 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 930 0, iscsi_co_generic_cb, &iTask) == NULL) { 931 qemu_mutex_unlock(&iscsilun->mutex); 932 return -ENOMEM; 933 } 934 935 iscsi_co_wait_for_task(&iTask, iscsilun); 936 937 if (iTask.task != NULL) { 938 scsi_free_scsi_task(iTask.task); 939 iTask.task = NULL; 940 } 941 942 if (iTask.do_retry) { 943 iTask.complete = 0; 944 goto retry; 945 } 946 947 if (iTask.status != SCSI_STATUS_GOOD) { 948 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 949 r = iTask.err_code; 950 } 951 952 qemu_mutex_unlock(&iscsilun->mutex); 953 g_free(iTask.err_str); 954 return r; 955 } 956 957 #ifdef __linux__ 958 /* Called (via iscsi_service) with QemuMutex held. */ 959 static void 960 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 961 void *command_data, void *opaque) 962 { 963 IscsiAIOCB *acb = opaque; 964 965 if (status == SCSI_STATUS_CANCELLED) { 966 if (!acb->bh) { 967 acb->status = -ECANCELED; 968 iscsi_schedule_bh(acb); 969 } 970 return; 971 } 972 973 acb->status = 0; 974 if (status < 0) { 975 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 976 iscsi_get_error(iscsi)); 977 acb->status = iscsi_translate_sense(&acb->task->sense); 978 } 979 980 acb->ioh->driver_status = 0; 981 acb->ioh->host_status = 0; 982 acb->ioh->resid = 0; 983 acb->ioh->status = status; 984 985 #define SG_ERR_DRIVER_SENSE 0x08 986 987 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 988 int ss; 989 990 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 991 992 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 993 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 994 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 995 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 996 } 997 998 iscsi_schedule_bh(acb); 999 } 1000 1001 static void iscsi_ioctl_bh_completion(void *opaque) 1002 { 1003 IscsiAIOCB *acb = opaque; 1004 1005 qemu_bh_delete(acb->bh); 1006 acb->common.cb(acb->common.opaque, acb->ret); 1007 qemu_aio_unref(acb); 1008 } 1009 1010 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 1011 { 1012 BlockDriverState *bs = acb->common.bs; 1013 IscsiLun *iscsilun = bs->opaque; 1014 int ret = 0; 1015 1016 switch (req) { 1017 case SG_GET_VERSION_NUM: 1018 *(int *)buf = 30000; 1019 break; 1020 case SG_GET_SCSI_ID: 1021 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 1022 break; 1023 default: 1024 ret = -EINVAL; 1025 } 1026 assert(!acb->bh); 1027 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 1028 iscsi_ioctl_bh_completion, acb); 1029 acb->ret = ret; 1030 qemu_bh_schedule(acb->bh); 1031 } 1032 1033 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1034 unsigned long int req, void *buf, 1035 BlockCompletionFunc *cb, void *opaque) 1036 { 1037 IscsiLun *iscsilun = bs->opaque; 1038 struct iscsi_context *iscsi = iscsilun->iscsi; 1039 struct iscsi_data data; 1040 IscsiAIOCB *acb; 1041 1042 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1043 1044 acb->iscsilun = iscsilun; 1045 acb->bh = NULL; 1046 acb->status = -EINPROGRESS; 1047 acb->ioh = buf; 1048 acb->cancelled = false; 1049 1050 if (req != SG_IO) { 1051 iscsi_ioctl_handle_emulated(acb, req, buf); 1052 return &acb->common; 1053 } 1054 1055 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1056 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1057 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1058 qemu_aio_unref(acb); 1059 return NULL; 1060 } 1061 1062 acb->task = malloc(sizeof(struct scsi_task)); 1063 if (acb->task == NULL) { 1064 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1065 iscsi_get_error(iscsi)); 1066 qemu_aio_unref(acb); 1067 return NULL; 1068 } 1069 memset(acb->task, 0, sizeof(struct scsi_task)); 1070 1071 switch (acb->ioh->dxfer_direction) { 1072 case SG_DXFER_TO_DEV: 1073 acb->task->xfer_dir = SCSI_XFER_WRITE; 1074 break; 1075 case SG_DXFER_FROM_DEV: 1076 acb->task->xfer_dir = SCSI_XFER_READ; 1077 break; 1078 default: 1079 acb->task->xfer_dir = SCSI_XFER_NONE; 1080 break; 1081 } 1082 1083 acb->task->cdb_size = acb->ioh->cmd_len; 1084 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1085 acb->task->expxferlen = acb->ioh->dxfer_len; 1086 1087 data.size = 0; 1088 qemu_mutex_lock(&iscsilun->mutex); 1089 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1090 if (acb->ioh->iovec_count == 0) { 1091 data.data = acb->ioh->dxferp; 1092 data.size = acb->ioh->dxfer_len; 1093 } else { 1094 scsi_task_set_iov_out(acb->task, 1095 (struct scsi_iovec *) acb->ioh->dxferp, 1096 acb->ioh->iovec_count); 1097 } 1098 } 1099 1100 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1101 iscsi_aio_ioctl_cb, 1102 (data.size > 0) ? &data : NULL, 1103 acb) != 0) { 1104 qemu_mutex_unlock(&iscsilun->mutex); 1105 scsi_free_scsi_task(acb->task); 1106 qemu_aio_unref(acb); 1107 return NULL; 1108 } 1109 1110 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1111 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1112 if (acb->ioh->iovec_count == 0) { 1113 scsi_task_add_data_in_buffer(acb->task, 1114 acb->ioh->dxfer_len, 1115 acb->ioh->dxferp); 1116 } else { 1117 scsi_task_set_iov_in(acb->task, 1118 (struct scsi_iovec *) acb->ioh->dxferp, 1119 acb->ioh->iovec_count); 1120 } 1121 } 1122 1123 iscsi_set_events(iscsilun); 1124 qemu_mutex_unlock(&iscsilun->mutex); 1125 1126 return &acb->common; 1127 } 1128 1129 #endif 1130 1131 static int64_t 1132 iscsi_getlength(BlockDriverState *bs) 1133 { 1134 IscsiLun *iscsilun = bs->opaque; 1135 int64_t len; 1136 1137 len = iscsilun->num_blocks; 1138 len *= iscsilun->block_size; 1139 1140 return len; 1141 } 1142 1143 static int 1144 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1145 { 1146 IscsiLun *iscsilun = bs->opaque; 1147 struct IscsiTask iTask; 1148 struct unmap_list list; 1149 int r = 0; 1150 1151 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1152 return -ENOTSUP; 1153 } 1154 1155 if (!iscsilun->lbp.lbpu) { 1156 /* UNMAP is not supported by the target */ 1157 return 0; 1158 } 1159 1160 list.lba = offset / iscsilun->block_size; 1161 list.num = bytes / iscsilun->block_size; 1162 1163 iscsi_co_init_iscsitask(iscsilun, &iTask); 1164 qemu_mutex_lock(&iscsilun->mutex); 1165 retry: 1166 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1167 iscsi_co_generic_cb, &iTask) == NULL) { 1168 r = -ENOMEM; 1169 goto out_unlock; 1170 } 1171 1172 iscsi_co_wait_for_task(&iTask, iscsilun); 1173 1174 if (iTask.task != NULL) { 1175 scsi_free_scsi_task(iTask.task); 1176 iTask.task = NULL; 1177 } 1178 1179 if (iTask.do_retry) { 1180 iTask.complete = 0; 1181 goto retry; 1182 } 1183 1184 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1185 1186 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1187 /* the target might fail with a check condition if it 1188 is not happy with the alignment of the UNMAP request 1189 we silently fail in this case */ 1190 goto out_unlock; 1191 } 1192 1193 if (iTask.status != SCSI_STATUS_GOOD) { 1194 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1195 list.lba, iTask.err_str); 1196 r = iTask.err_code; 1197 goto out_unlock; 1198 } 1199 1200 out_unlock: 1201 qemu_mutex_unlock(&iscsilun->mutex); 1202 g_free(iTask.err_str); 1203 return r; 1204 } 1205 1206 static int 1207 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1208 int bytes, BdrvRequestFlags flags) 1209 { 1210 IscsiLun *iscsilun = bs->opaque; 1211 struct IscsiTask iTask; 1212 uint64_t lba; 1213 uint32_t nb_blocks; 1214 bool use_16_for_ws = iscsilun->use_16_for_rw; 1215 int r = 0; 1216 1217 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1218 return -ENOTSUP; 1219 } 1220 1221 if (flags & BDRV_REQ_MAY_UNMAP) { 1222 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1223 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1224 use_16_for_ws = true; 1225 } 1226 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1227 /* WRITESAME16 with UNMAP is not supported by the target, 1228 * fall back and try WRITESAME10/16 without UNMAP */ 1229 flags &= ~BDRV_REQ_MAY_UNMAP; 1230 use_16_for_ws = iscsilun->use_16_for_rw; 1231 } 1232 } 1233 1234 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1235 /* WRITESAME without UNMAP is not supported by the target */ 1236 return -ENOTSUP; 1237 } 1238 1239 lba = offset / iscsilun->block_size; 1240 nb_blocks = bytes / iscsilun->block_size; 1241 1242 if (iscsilun->zeroblock == NULL) { 1243 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1244 if (iscsilun->zeroblock == NULL) { 1245 return -ENOMEM; 1246 } 1247 } 1248 1249 qemu_mutex_lock(&iscsilun->mutex); 1250 iscsi_co_init_iscsitask(iscsilun, &iTask); 1251 retry: 1252 if (use_16_for_ws) { 1253 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1254 iscsilun->zeroblock, iscsilun->block_size, 1255 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1256 0, 0, iscsi_co_generic_cb, &iTask); 1257 } else { 1258 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1259 iscsilun->zeroblock, iscsilun->block_size, 1260 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1261 0, 0, iscsi_co_generic_cb, &iTask); 1262 } 1263 if (iTask.task == NULL) { 1264 qemu_mutex_unlock(&iscsilun->mutex); 1265 return -ENOMEM; 1266 } 1267 1268 iscsi_co_wait_for_task(&iTask, iscsilun); 1269 1270 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1271 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1272 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1273 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1274 /* WRITE SAME is not supported by the target */ 1275 iscsilun->has_write_same = false; 1276 scsi_free_scsi_task(iTask.task); 1277 r = -ENOTSUP; 1278 goto out_unlock; 1279 } 1280 1281 if (iTask.task != NULL) { 1282 scsi_free_scsi_task(iTask.task); 1283 iTask.task = NULL; 1284 } 1285 1286 if (iTask.do_retry) { 1287 iTask.complete = 0; 1288 goto retry; 1289 } 1290 1291 if (iTask.status != SCSI_STATUS_GOOD) { 1292 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1293 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1294 lba, iTask.err_str); 1295 r = iTask.err_code; 1296 goto out_unlock; 1297 } 1298 1299 if (flags & BDRV_REQ_MAY_UNMAP) { 1300 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1301 } else { 1302 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1303 } 1304 1305 out_unlock: 1306 qemu_mutex_unlock(&iscsilun->mutex); 1307 g_free(iTask.err_str); 1308 return r; 1309 } 1310 1311 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1312 Error **errp) 1313 { 1314 const char *user = NULL; 1315 const char *password = NULL; 1316 const char *secretid; 1317 char *secret = NULL; 1318 1319 user = qemu_opt_get(opts, "user"); 1320 if (!user) { 1321 return; 1322 } 1323 1324 secretid = qemu_opt_get(opts, "password-secret"); 1325 password = qemu_opt_get(opts, "password"); 1326 if (secretid && password) { 1327 error_setg(errp, "'password' and 'password-secret' properties are " 1328 "mutually exclusive"); 1329 return; 1330 } 1331 if (secretid) { 1332 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1333 if (!secret) { 1334 return; 1335 } 1336 password = secret; 1337 } else if (!password) { 1338 error_setg(errp, "CHAP username specified but no password was given"); 1339 return; 1340 } 1341 1342 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1343 error_setg(errp, "Failed to set initiator username and password"); 1344 } 1345 1346 g_free(secret); 1347 } 1348 1349 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1350 Error **errp) 1351 { 1352 const char *digest = NULL; 1353 1354 digest = qemu_opt_get(opts, "header-digest"); 1355 if (!digest) { 1356 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1357 } else if (!strcmp(digest, "crc32c")) { 1358 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1359 } else if (!strcmp(digest, "none")) { 1360 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1361 } else if (!strcmp(digest, "crc32c-none")) { 1362 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1363 } else if (!strcmp(digest, "none-crc32c")) { 1364 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1365 } else { 1366 error_setg(errp, "Invalid header-digest setting : %s", digest); 1367 } 1368 } 1369 1370 static char *get_initiator_name(QemuOpts *opts) 1371 { 1372 const char *name; 1373 char *iscsi_name; 1374 UuidInfo *uuid_info; 1375 1376 name = qemu_opt_get(opts, "initiator-name"); 1377 if (name) { 1378 return g_strdup(name); 1379 } 1380 1381 uuid_info = qmp_query_uuid(NULL); 1382 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1383 name = qemu_get_vm_name(); 1384 } else { 1385 name = uuid_info->UUID; 1386 } 1387 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1388 name ? ":" : "", name ? name : ""); 1389 qapi_free_UuidInfo(uuid_info); 1390 return iscsi_name; 1391 } 1392 1393 static void iscsi_nop_timed_event(void *opaque) 1394 { 1395 IscsiLun *iscsilun = opaque; 1396 1397 qemu_mutex_lock(&iscsilun->mutex); 1398 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1399 error_report("iSCSI: NOP timeout. Reconnecting..."); 1400 iscsilun->request_timed_out = true; 1401 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1402 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1403 goto out; 1404 } 1405 1406 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1407 iscsi_set_events(iscsilun); 1408 1409 out: 1410 qemu_mutex_unlock(&iscsilun->mutex); 1411 } 1412 1413 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1414 { 1415 struct scsi_task *task = NULL; 1416 struct scsi_readcapacity10 *rc10 = NULL; 1417 struct scsi_readcapacity16 *rc16 = NULL; 1418 int retries = ISCSI_CMD_RETRIES; 1419 1420 do { 1421 if (task != NULL) { 1422 scsi_free_scsi_task(task); 1423 task = NULL; 1424 } 1425 1426 switch (iscsilun->type) { 1427 case TYPE_DISK: 1428 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1429 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1430 rc16 = scsi_datain_unmarshall(task); 1431 if (rc16 == NULL) { 1432 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1433 } else { 1434 iscsilun->block_size = rc16->block_length; 1435 iscsilun->num_blocks = rc16->returned_lba + 1; 1436 iscsilun->lbpme = !!rc16->lbpme; 1437 iscsilun->lbprz = !!rc16->lbprz; 1438 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1439 } 1440 break; 1441 } 1442 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1443 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1444 break; 1445 } 1446 /* Fall through and try READ CAPACITY(10) instead. */ 1447 case TYPE_ROM: 1448 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1449 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1450 rc10 = scsi_datain_unmarshall(task); 1451 if (rc10 == NULL) { 1452 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1453 } else { 1454 iscsilun->block_size = rc10->block_size; 1455 if (rc10->lba == 0) { 1456 /* blank disk loaded */ 1457 iscsilun->num_blocks = 0; 1458 } else { 1459 iscsilun->num_blocks = rc10->lba + 1; 1460 } 1461 } 1462 } 1463 break; 1464 default: 1465 return; 1466 } 1467 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1468 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1469 && retries-- > 0); 1470 1471 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1472 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1473 } else if (!iscsilun->block_size || 1474 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1475 error_setg(errp, "iSCSI: the target returned an invalid " 1476 "block size of %d.", iscsilun->block_size); 1477 } 1478 if (task) { 1479 scsi_free_scsi_task(task); 1480 } 1481 } 1482 1483 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1484 int evpd, int pc, void **inq, Error **errp) 1485 { 1486 int full_size; 1487 struct scsi_task *task = NULL; 1488 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1489 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1490 goto fail; 1491 } 1492 full_size = scsi_datain_getfullsize(task); 1493 if (full_size > task->datain.size) { 1494 scsi_free_scsi_task(task); 1495 1496 /* we need more data for the full list */ 1497 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1498 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1499 goto fail; 1500 } 1501 } 1502 1503 *inq = scsi_datain_unmarshall(task); 1504 if (*inq == NULL) { 1505 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1506 goto fail_with_err; 1507 } 1508 1509 return task; 1510 1511 fail: 1512 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1513 iscsi_get_error(iscsi)); 1514 fail_with_err: 1515 if (task != NULL) { 1516 scsi_free_scsi_task(task); 1517 } 1518 return NULL; 1519 } 1520 1521 static void iscsi_detach_aio_context(BlockDriverState *bs) 1522 { 1523 IscsiLun *iscsilun = bs->opaque; 1524 1525 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1526 false, NULL, NULL, NULL, NULL); 1527 iscsilun->events = 0; 1528 1529 if (iscsilun->nop_timer) { 1530 timer_del(iscsilun->nop_timer); 1531 timer_free(iscsilun->nop_timer); 1532 iscsilun->nop_timer = NULL; 1533 } 1534 if (iscsilun->event_timer) { 1535 timer_del(iscsilun->event_timer); 1536 timer_free(iscsilun->event_timer); 1537 iscsilun->event_timer = NULL; 1538 } 1539 } 1540 1541 static void iscsi_attach_aio_context(BlockDriverState *bs, 1542 AioContext *new_context) 1543 { 1544 IscsiLun *iscsilun = bs->opaque; 1545 1546 iscsilun->aio_context = new_context; 1547 iscsi_set_events(iscsilun); 1548 1549 /* Set up a timer for sending out iSCSI NOPs */ 1550 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1551 QEMU_CLOCK_REALTIME, SCALE_MS, 1552 iscsi_nop_timed_event, iscsilun); 1553 timer_mod(iscsilun->nop_timer, 1554 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1555 1556 /* Set up a timer for periodic calls to iscsi_set_events and to 1557 * scan for command timeout */ 1558 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1559 QEMU_CLOCK_REALTIME, SCALE_MS, 1560 iscsi_timed_check_events, iscsilun); 1561 timer_mod(iscsilun->event_timer, 1562 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1563 } 1564 1565 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1566 { 1567 struct scsi_task *task; 1568 struct scsi_mode_sense *ms = NULL; 1569 iscsilun->write_protected = false; 1570 iscsilun->dpofua = false; 1571 1572 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1573 1, SCSI_MODESENSE_PC_CURRENT, 1574 0x3F, 0, 255); 1575 if (task == NULL) { 1576 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1577 iscsi_get_error(iscsilun->iscsi)); 1578 goto out; 1579 } 1580 1581 if (task->status != SCSI_STATUS_GOOD) { 1582 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1583 goto out; 1584 } 1585 ms = scsi_datain_unmarshall(task); 1586 if (!ms) { 1587 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1588 iscsi_get_error(iscsilun->iscsi)); 1589 goto out; 1590 } 1591 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1592 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1593 1594 out: 1595 if (task) { 1596 scsi_free_scsi_task(task); 1597 } 1598 } 1599 1600 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1601 { 1602 QemuOptsList *list; 1603 QemuOpts *opts; 1604 const char *user, *password, *password_secret, *initiator_name, 1605 *header_digest, *timeout; 1606 1607 list = qemu_find_opts("iscsi"); 1608 if (!list) { 1609 return; 1610 } 1611 1612 opts = qemu_opts_find(list, target); 1613 if (opts == NULL) { 1614 opts = QTAILQ_FIRST(&list->head); 1615 if (!opts) { 1616 return; 1617 } 1618 } 1619 1620 user = qemu_opt_get(opts, "user"); 1621 if (user) { 1622 qdict_set_default_str(options, "user", user); 1623 } 1624 1625 password = qemu_opt_get(opts, "password"); 1626 if (password) { 1627 qdict_set_default_str(options, "password", password); 1628 } 1629 1630 password_secret = qemu_opt_get(opts, "password-secret"); 1631 if (password_secret) { 1632 qdict_set_default_str(options, "password-secret", password_secret); 1633 } 1634 1635 initiator_name = qemu_opt_get(opts, "initiator-name"); 1636 if (initiator_name) { 1637 qdict_set_default_str(options, "initiator-name", initiator_name); 1638 } 1639 1640 header_digest = qemu_opt_get(opts, "header-digest"); 1641 if (header_digest) { 1642 /* -iscsi takes upper case values, but QAPI only supports lower case 1643 * enum constant names, so we have to convert here. */ 1644 char *qapi_value = g_ascii_strdown(header_digest, -1); 1645 qdict_set_default_str(options, "header-digest", qapi_value); 1646 g_free(qapi_value); 1647 } 1648 1649 timeout = qemu_opt_get(opts, "timeout"); 1650 if (timeout) { 1651 qdict_set_default_str(options, "timeout", timeout); 1652 } 1653 } 1654 1655 /* 1656 * We support iscsi url's on the form 1657 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1658 */ 1659 static void iscsi_parse_filename(const char *filename, QDict *options, 1660 Error **errp) 1661 { 1662 struct iscsi_url *iscsi_url; 1663 const char *transport_name; 1664 char *lun_str; 1665 1666 iscsi_url = iscsi_parse_full_url(NULL, filename); 1667 if (iscsi_url == NULL) { 1668 error_setg(errp, "Failed to parse URL : %s", filename); 1669 return; 1670 } 1671 1672 #if LIBISCSI_API_VERSION >= (20160603) 1673 switch (iscsi_url->transport) { 1674 case TCP_TRANSPORT: 1675 transport_name = "tcp"; 1676 break; 1677 case ISER_TRANSPORT: 1678 transport_name = "iser"; 1679 break; 1680 default: 1681 error_setg(errp, "Unknown transport type (%d)", 1682 iscsi_url->transport); 1683 return; 1684 } 1685 #else 1686 transport_name = "tcp"; 1687 #endif 1688 1689 qdict_set_default_str(options, "transport", transport_name); 1690 qdict_set_default_str(options, "portal", iscsi_url->portal); 1691 qdict_set_default_str(options, "target", iscsi_url->target); 1692 1693 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1694 qdict_set_default_str(options, "lun", lun_str); 1695 g_free(lun_str); 1696 1697 /* User/password from -iscsi take precedence over those from the URL */ 1698 iscsi_parse_iscsi_option(iscsi_url->target, options); 1699 1700 if (iscsi_url->user[0] != '\0') { 1701 qdict_set_default_str(options, "user", iscsi_url->user); 1702 qdict_set_default_str(options, "password", iscsi_url->passwd); 1703 } 1704 1705 iscsi_destroy_url(iscsi_url); 1706 } 1707 1708 static QemuOptsList runtime_opts = { 1709 .name = "iscsi", 1710 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1711 .desc = { 1712 { 1713 .name = "transport", 1714 .type = QEMU_OPT_STRING, 1715 }, 1716 { 1717 .name = "portal", 1718 .type = QEMU_OPT_STRING, 1719 }, 1720 { 1721 .name = "target", 1722 .type = QEMU_OPT_STRING, 1723 }, 1724 { 1725 .name = "user", 1726 .type = QEMU_OPT_STRING, 1727 }, 1728 { 1729 .name = "password", 1730 .type = QEMU_OPT_STRING, 1731 }, 1732 { 1733 .name = "password-secret", 1734 .type = QEMU_OPT_STRING, 1735 }, 1736 { 1737 .name = "lun", 1738 .type = QEMU_OPT_NUMBER, 1739 }, 1740 { 1741 .name = "initiator-name", 1742 .type = QEMU_OPT_STRING, 1743 }, 1744 { 1745 .name = "header-digest", 1746 .type = QEMU_OPT_STRING, 1747 }, 1748 { 1749 .name = "timeout", 1750 .type = QEMU_OPT_NUMBER, 1751 }, 1752 { /* end of list */ } 1753 }, 1754 }; 1755 1756 static void iscsi_save_designator(IscsiLun *lun, 1757 struct scsi_inquiry_device_identification *inq_di) 1758 { 1759 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1760 1761 for (desig = inq_di->designators; desig; desig = desig->next) { 1762 if (desig->association || 1763 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1764 continue; 1765 } 1766 /* NAA works better than T10 vendor ID based designator. */ 1767 if (!copy || copy->designator_type < desig->designator_type) { 1768 copy = desig; 1769 } 1770 } 1771 if (copy) { 1772 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1773 *lun->dd = *copy; 1774 lun->dd->next = NULL; 1775 lun->dd->designator = g_malloc(copy->designator_length); 1776 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1777 } 1778 } 1779 1780 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1781 Error **errp) 1782 { 1783 IscsiLun *iscsilun = bs->opaque; 1784 struct iscsi_context *iscsi = NULL; 1785 struct scsi_task *task = NULL; 1786 struct scsi_inquiry_standard *inq = NULL; 1787 struct scsi_inquiry_supported_pages *inq_vpd; 1788 char *initiator_name = NULL; 1789 QemuOpts *opts; 1790 Error *local_err = NULL; 1791 const char *transport_name, *portal, *target; 1792 #if LIBISCSI_API_VERSION >= (20160603) 1793 enum iscsi_transport_type transport; 1794 #endif 1795 int i, ret = 0, timeout = 0, lun; 1796 1797 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1798 qemu_opts_absorb_qdict(opts, options, &local_err); 1799 if (local_err) { 1800 error_propagate(errp, local_err); 1801 ret = -EINVAL; 1802 goto out; 1803 } 1804 1805 transport_name = qemu_opt_get(opts, "transport"); 1806 portal = qemu_opt_get(opts, "portal"); 1807 target = qemu_opt_get(opts, "target"); 1808 lun = qemu_opt_get_number(opts, "lun", 0); 1809 1810 if (!transport_name || !portal || !target) { 1811 error_setg(errp, "Need all of transport, portal and target options"); 1812 ret = -EINVAL; 1813 goto out; 1814 } 1815 1816 if (!strcmp(transport_name, "tcp")) { 1817 #if LIBISCSI_API_VERSION >= (20160603) 1818 transport = TCP_TRANSPORT; 1819 } else if (!strcmp(transport_name, "iser")) { 1820 transport = ISER_TRANSPORT; 1821 #else 1822 /* TCP is what older libiscsi versions always use */ 1823 #endif 1824 } else { 1825 error_setg(errp, "Unknown transport: %s", transport_name); 1826 ret = -EINVAL; 1827 goto out; 1828 } 1829 1830 memset(iscsilun, 0, sizeof(IscsiLun)); 1831 1832 initiator_name = get_initiator_name(opts); 1833 1834 iscsi = iscsi_create_context(initiator_name); 1835 if (iscsi == NULL) { 1836 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1837 ret = -ENOMEM; 1838 goto out; 1839 } 1840 #if LIBISCSI_API_VERSION >= (20160603) 1841 if (iscsi_init_transport(iscsi, transport)) { 1842 error_setg(errp, ("Error initializing transport.")); 1843 ret = -EINVAL; 1844 goto out; 1845 } 1846 #endif 1847 if (iscsi_set_targetname(iscsi, target)) { 1848 error_setg(errp, "iSCSI: Failed to set target name."); 1849 ret = -EINVAL; 1850 goto out; 1851 } 1852 1853 /* check if we got CHAP username/password via the options */ 1854 apply_chap(iscsi, opts, &local_err); 1855 if (local_err != NULL) { 1856 error_propagate(errp, local_err); 1857 ret = -EINVAL; 1858 goto out; 1859 } 1860 1861 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1862 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1863 ret = -EINVAL; 1864 goto out; 1865 } 1866 1867 /* check if we got HEADER_DIGEST via the options */ 1868 apply_header_digest(iscsi, opts, &local_err); 1869 if (local_err != NULL) { 1870 error_propagate(errp, local_err); 1871 ret = -EINVAL; 1872 goto out; 1873 } 1874 1875 /* timeout handling is broken in libiscsi before 1.15.0 */ 1876 timeout = qemu_opt_get_number(opts, "timeout", 0); 1877 #if LIBISCSI_API_VERSION >= 20150621 1878 iscsi_set_timeout(iscsi, timeout); 1879 #else 1880 if (timeout) { 1881 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1882 } 1883 #endif 1884 1885 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1886 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1887 iscsi_get_error(iscsi)); 1888 ret = -EINVAL; 1889 goto out; 1890 } 1891 1892 iscsilun->iscsi = iscsi; 1893 iscsilun->aio_context = bdrv_get_aio_context(bs); 1894 iscsilun->lun = lun; 1895 iscsilun->has_write_same = true; 1896 1897 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1898 (void **) &inq, errp); 1899 if (task == NULL) { 1900 ret = -EINVAL; 1901 goto out; 1902 } 1903 iscsilun->type = inq->periperal_device_type; 1904 scsi_free_scsi_task(task); 1905 task = NULL; 1906 1907 iscsi_modesense_sync(iscsilun); 1908 if (iscsilun->dpofua) { 1909 bs->supported_write_flags = BDRV_REQ_FUA; 1910 } 1911 1912 /* Check the write protect flag of the LUN if we want to write */ 1913 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1914 iscsilun->write_protected) { 1915 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1916 if (ret < 0) { 1917 goto out; 1918 } 1919 flags &= ~BDRV_O_RDWR; 1920 } 1921 1922 iscsi_readcapacity_sync(iscsilun, &local_err); 1923 if (local_err != NULL) { 1924 error_propagate(errp, local_err); 1925 ret = -EINVAL; 1926 goto out; 1927 } 1928 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1929 1930 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1931 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1932 * will try to read from the device to guess the image format. 1933 */ 1934 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1935 bs->sg = true; 1936 } 1937 1938 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1939 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1940 (void **) &inq_vpd, errp); 1941 if (task == NULL) { 1942 ret = -EINVAL; 1943 goto out; 1944 } 1945 for (i = 0; i < inq_vpd->num_pages; i++) { 1946 struct scsi_task *inq_task; 1947 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1948 struct scsi_inquiry_block_limits *inq_bl; 1949 struct scsi_inquiry_device_identification *inq_di; 1950 switch (inq_vpd->pages[i]) { 1951 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1952 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1953 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1954 (void **) &inq_lbp, errp); 1955 if (inq_task == NULL) { 1956 ret = -EINVAL; 1957 goto out; 1958 } 1959 memcpy(&iscsilun->lbp, inq_lbp, 1960 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1961 scsi_free_scsi_task(inq_task); 1962 break; 1963 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1964 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1965 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1966 (void **) &inq_bl, errp); 1967 if (inq_task == NULL) { 1968 ret = -EINVAL; 1969 goto out; 1970 } 1971 memcpy(&iscsilun->bl, inq_bl, 1972 sizeof(struct scsi_inquiry_block_limits)); 1973 scsi_free_scsi_task(inq_task); 1974 break; 1975 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1976 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1977 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1978 (void **) &inq_di, errp); 1979 if (inq_task == NULL) { 1980 ret = -EINVAL; 1981 goto out; 1982 } 1983 iscsi_save_designator(iscsilun, inq_di); 1984 scsi_free_scsi_task(inq_task); 1985 break; 1986 default: 1987 break; 1988 } 1989 } 1990 scsi_free_scsi_task(task); 1991 task = NULL; 1992 1993 qemu_mutex_init(&iscsilun->mutex); 1994 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1995 1996 /* Guess the internal cluster (page) size of the iscsi target by the means 1997 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1998 * reasonable size */ 1999 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 2000 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 2001 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 2002 iscsilun->block_size; 2003 if (iscsilun->lbprz) { 2004 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 2005 } 2006 } 2007 2008 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2009 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2010 } 2011 2012 out: 2013 qemu_opts_del(opts); 2014 g_free(initiator_name); 2015 if (task != NULL) { 2016 scsi_free_scsi_task(task); 2017 } 2018 2019 if (ret) { 2020 if (iscsi != NULL) { 2021 if (iscsi_is_logged_in(iscsi)) { 2022 iscsi_logout_sync(iscsi); 2023 } 2024 iscsi_destroy_context(iscsi); 2025 } 2026 memset(iscsilun, 0, sizeof(IscsiLun)); 2027 } 2028 2029 return ret; 2030 } 2031 2032 static void iscsi_close(BlockDriverState *bs) 2033 { 2034 IscsiLun *iscsilun = bs->opaque; 2035 struct iscsi_context *iscsi = iscsilun->iscsi; 2036 2037 iscsi_detach_aio_context(bs); 2038 if (iscsi_is_logged_in(iscsi)) { 2039 iscsi_logout_sync(iscsi); 2040 } 2041 iscsi_destroy_context(iscsi); 2042 if (iscsilun->dd) { 2043 g_free(iscsilun->dd->designator); 2044 g_free(iscsilun->dd); 2045 } 2046 g_free(iscsilun->zeroblock); 2047 iscsi_allocmap_free(iscsilun); 2048 qemu_mutex_destroy(&iscsilun->mutex); 2049 memset(iscsilun, 0, sizeof(IscsiLun)); 2050 } 2051 2052 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2053 { 2054 /* We don't actually refresh here, but just return data queried in 2055 * iscsi_open(): iscsi targets don't change their limits. */ 2056 2057 IscsiLun *iscsilun = bs->opaque; 2058 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2059 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2060 2061 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2062 2063 bs->bl.request_alignment = block_size; 2064 2065 if (iscsilun->bl.max_xfer_len) { 2066 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2067 } 2068 2069 if (max_xfer_len * block_size < INT_MAX) { 2070 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2071 } 2072 2073 if (iscsilun->lbp.lbpu) { 2074 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2075 bs->bl.max_pdiscard = 2076 iscsilun->bl.max_unmap * iscsilun->block_size; 2077 } 2078 bs->bl.pdiscard_alignment = 2079 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2080 } else { 2081 bs->bl.pdiscard_alignment = iscsilun->block_size; 2082 } 2083 2084 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2085 bs->bl.max_pwrite_zeroes = 2086 iscsilun->bl.max_ws_len * iscsilun->block_size; 2087 } 2088 if (iscsilun->lbp.lbpws) { 2089 bs->bl.pwrite_zeroes_alignment = 2090 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2091 } else { 2092 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2093 } 2094 if (iscsilun->bl.opt_xfer_len && 2095 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2096 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2097 iscsilun->block_size); 2098 } 2099 } 2100 2101 /* Note that this will not re-establish a connection with an iSCSI target - it 2102 * is effectively a NOP. */ 2103 static int iscsi_reopen_prepare(BDRVReopenState *state, 2104 BlockReopenQueue *queue, Error **errp) 2105 { 2106 IscsiLun *iscsilun = state->bs->opaque; 2107 2108 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2109 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2110 return -EACCES; 2111 } 2112 return 0; 2113 } 2114 2115 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2116 { 2117 IscsiLun *iscsilun = reopen_state->bs->opaque; 2118 2119 /* the cache.direct status might have changed */ 2120 if (iscsilun->allocmap != NULL) { 2121 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2122 } 2123 } 2124 2125 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2126 PreallocMode prealloc, Error **errp) 2127 { 2128 IscsiLun *iscsilun = bs->opaque; 2129 Error *local_err = NULL; 2130 2131 if (prealloc != PREALLOC_MODE_OFF) { 2132 error_setg(errp, "Unsupported preallocation mode '%s'", 2133 PreallocMode_str(prealloc)); 2134 return -ENOTSUP; 2135 } 2136 2137 if (iscsilun->type != TYPE_DISK) { 2138 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2139 return -ENOTSUP; 2140 } 2141 2142 iscsi_readcapacity_sync(iscsilun, &local_err); 2143 if (local_err != NULL) { 2144 error_propagate(errp, local_err); 2145 return -EIO; 2146 } 2147 2148 if (offset > iscsi_getlength(bs)) { 2149 error_setg(errp, "Cannot grow iSCSI devices"); 2150 return -EINVAL; 2151 } 2152 2153 if (iscsilun->allocmap != NULL) { 2154 iscsi_allocmap_init(iscsilun, bs->open_flags); 2155 } 2156 2157 return 0; 2158 } 2159 2160 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2161 Error **errp) 2162 { 2163 int ret = 0; 2164 int64_t total_size = 0; 2165 BlockDriverState *bs; 2166 IscsiLun *iscsilun = NULL; 2167 QDict *bs_options; 2168 Error *local_err = NULL; 2169 2170 bs = bdrv_new(); 2171 2172 /* Read out options */ 2173 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2174 BDRV_SECTOR_SIZE); 2175 bs->opaque = g_new0(struct IscsiLun, 1); 2176 iscsilun = bs->opaque; 2177 2178 bs_options = qdict_new(); 2179 iscsi_parse_filename(filename, bs_options, &local_err); 2180 if (local_err) { 2181 error_propagate(errp, local_err); 2182 ret = -EINVAL; 2183 } else { 2184 ret = iscsi_open(bs, bs_options, 0, NULL); 2185 } 2186 qobject_unref(bs_options); 2187 2188 if (ret != 0) { 2189 goto out; 2190 } 2191 iscsi_detach_aio_context(bs); 2192 if (iscsilun->type != TYPE_DISK) { 2193 ret = -ENODEV; 2194 goto out; 2195 } 2196 if (bs->total_sectors < total_size) { 2197 ret = -ENOSPC; 2198 goto out; 2199 } 2200 2201 ret = 0; 2202 out: 2203 if (iscsilun->iscsi != NULL) { 2204 iscsi_destroy_context(iscsilun->iscsi); 2205 } 2206 g_free(bs->opaque); 2207 bs->opaque = NULL; 2208 bdrv_unref(bs); 2209 return ret; 2210 } 2211 2212 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2213 { 2214 IscsiLun *iscsilun = bs->opaque; 2215 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2216 bdi->cluster_size = iscsilun->cluster_size; 2217 return 0; 2218 } 2219 2220 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2221 Error **errp) 2222 { 2223 IscsiLun *iscsilun = bs->opaque; 2224 iscsi_allocmap_invalidate(iscsilun); 2225 } 2226 2227 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2228 BdrvChild *src, 2229 uint64_t src_offset, 2230 BdrvChild *dst, 2231 uint64_t dst_offset, 2232 uint64_t bytes, 2233 BdrvRequestFlags read_flags, 2234 BdrvRequestFlags write_flags) 2235 { 2236 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2237 read_flags, write_flags); 2238 } 2239 2240 static struct scsi_task *iscsi_xcopy_task(int param_len) 2241 { 2242 struct scsi_task *task; 2243 2244 task = g_new0(struct scsi_task, 1); 2245 2246 task->cdb[0] = EXTENDED_COPY; 2247 task->cdb[10] = (param_len >> 24) & 0xFF; 2248 task->cdb[11] = (param_len >> 16) & 0xFF; 2249 task->cdb[12] = (param_len >> 8) & 0xFF; 2250 task->cdb[13] = param_len & 0xFF; 2251 task->cdb_size = 16; 2252 task->xfer_dir = SCSI_XFER_WRITE; 2253 task->expxferlen = param_len; 2254 2255 return task; 2256 } 2257 2258 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2259 { 2260 struct scsi_inquiry_device_designator *dd = lun->dd; 2261 2262 memset(desc, 0, 32); 2263 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2264 desc[4] = dd->code_set; 2265 desc[5] = (dd->designator_type & 0xF) 2266 | ((dd->association & 3) << 4); 2267 desc[7] = dd->designator_length; 2268 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2269 2270 desc[28] = 0; 2271 desc[29] = (lun->block_size >> 16) & 0xFF; 2272 desc[30] = (lun->block_size >> 8) & 0xFF; 2273 desc[31] = lun->block_size & 0xFF; 2274 } 2275 2276 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2277 int dst_index) 2278 { 2279 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2280 hdr[1] = ((dc << 1) | cat) & 0xFF; 2281 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2282 /* don't account for the first 4 bytes in descriptor header*/ 2283 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2284 hdr[4] = (src_index >> 8) & 0xFF; 2285 hdr[5] = src_index & 0xFF; 2286 hdr[6] = (dst_index >> 8) & 0xFF; 2287 hdr[7] = dst_index & 0xFF; 2288 } 2289 2290 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2291 int src_index, int dst_index, int num_blks, 2292 uint64_t src_lba, uint64_t dst_lba) 2293 { 2294 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2295 2296 /* The caller should verify the request size */ 2297 assert(num_blks < 65536); 2298 desc[10] = (num_blks >> 8) & 0xFF; 2299 desc[11] = num_blks & 0xFF; 2300 desc[12] = (src_lba >> 56) & 0xFF; 2301 desc[13] = (src_lba >> 48) & 0xFF; 2302 desc[14] = (src_lba >> 40) & 0xFF; 2303 desc[15] = (src_lba >> 32) & 0xFF; 2304 desc[16] = (src_lba >> 24) & 0xFF; 2305 desc[17] = (src_lba >> 16) & 0xFF; 2306 desc[18] = (src_lba >> 8) & 0xFF; 2307 desc[19] = src_lba & 0xFF; 2308 desc[20] = (dst_lba >> 56) & 0xFF; 2309 desc[21] = (dst_lba >> 48) & 0xFF; 2310 desc[22] = (dst_lba >> 40) & 0xFF; 2311 desc[23] = (dst_lba >> 32) & 0xFF; 2312 desc[24] = (dst_lba >> 24) & 0xFF; 2313 desc[25] = (dst_lba >> 16) & 0xFF; 2314 desc[26] = (dst_lba >> 8) & 0xFF; 2315 desc[27] = dst_lba & 0xFF; 2316 } 2317 2318 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2319 int list_id_usage, int prio, 2320 int tgt_desc_len, 2321 int seg_desc_len, int inline_data_len) 2322 { 2323 buf[0] = list_id; 2324 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2325 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2326 buf[3] = tgt_desc_len & 0xFF; 2327 buf[8] = (seg_desc_len >> 24) & 0xFF; 2328 buf[9] = (seg_desc_len >> 16) & 0xFF; 2329 buf[10] = (seg_desc_len >> 8) & 0xFF; 2330 buf[11] = seg_desc_len & 0xFF; 2331 buf[12] = (inline_data_len >> 24) & 0xFF; 2332 buf[13] = (inline_data_len >> 16) & 0xFF; 2333 buf[14] = (inline_data_len >> 8) & 0xFF; 2334 buf[15] = inline_data_len & 0xFF; 2335 } 2336 2337 static void iscsi_xcopy_data(struct iscsi_data *data, 2338 IscsiLun *src, int64_t src_lba, 2339 IscsiLun *dst, int64_t dst_lba, 2340 uint16_t num_blocks) 2341 { 2342 uint8_t *buf; 2343 const int src_offset = XCOPY_DESC_OFFSET; 2344 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2345 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2346 2347 data->size = XCOPY_DESC_OFFSET + 2348 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2349 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2350 data->data = g_malloc0(data->size); 2351 buf = data->data; 2352 2353 /* Initialise the parameter list header */ 2354 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2355 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2356 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2357 0); 2358 2359 /* Initialise CSCD list with one src + one dst descriptor */ 2360 iscsi_populate_target_desc(&buf[src_offset], src); 2361 iscsi_populate_target_desc(&buf[dst_offset], dst); 2362 2363 /* Initialise one segment descriptor */ 2364 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2365 src_lba, dst_lba); 2366 } 2367 2368 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2369 BdrvChild *src, 2370 uint64_t src_offset, 2371 BdrvChild *dst, 2372 uint64_t dst_offset, 2373 uint64_t bytes, 2374 BdrvRequestFlags read_flags, 2375 BdrvRequestFlags write_flags) 2376 { 2377 IscsiLun *dst_lun = dst->bs->opaque; 2378 IscsiLun *src_lun; 2379 struct IscsiTask iscsi_task; 2380 struct iscsi_data data; 2381 int r = 0; 2382 int block_size; 2383 2384 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2385 return -ENOTSUP; 2386 } 2387 src_lun = src->bs->opaque; 2388 2389 if (!src_lun->dd || !dst_lun->dd) { 2390 return -ENOTSUP; 2391 } 2392 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2393 return -ENOTSUP; 2394 } 2395 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2396 return -ENOTSUP; 2397 } 2398 if (dst_lun->block_size != src_lun->block_size || 2399 !dst_lun->block_size) { 2400 return -ENOTSUP; 2401 } 2402 2403 block_size = dst_lun->block_size; 2404 if (bytes / block_size > 65535) { 2405 return -ENOTSUP; 2406 } 2407 2408 iscsi_xcopy_data(&data, 2409 src_lun, src_offset / block_size, 2410 dst_lun, dst_offset / block_size, 2411 bytes / block_size); 2412 2413 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2414 2415 qemu_mutex_lock(&dst_lun->mutex); 2416 iscsi_task.task = iscsi_xcopy_task(data.size); 2417 retry: 2418 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2419 iscsi_task.task, iscsi_co_generic_cb, 2420 &data, 2421 &iscsi_task) != 0) { 2422 r = -EIO; 2423 goto out_unlock; 2424 } 2425 2426 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2427 2428 if (iscsi_task.do_retry) { 2429 iscsi_task.complete = 0; 2430 goto retry; 2431 } 2432 2433 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2434 r = iscsi_task.err_code; 2435 goto out_unlock; 2436 } 2437 2438 out_unlock: 2439 2440 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2441 g_free(iscsi_task.task); 2442 qemu_mutex_unlock(&dst_lun->mutex); 2443 g_free(iscsi_task.err_str); 2444 return r; 2445 } 2446 2447 static QemuOptsList iscsi_create_opts = { 2448 .name = "iscsi-create-opts", 2449 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2450 .desc = { 2451 { 2452 .name = BLOCK_OPT_SIZE, 2453 .type = QEMU_OPT_SIZE, 2454 .help = "Virtual disk size" 2455 }, 2456 { /* end of list */ } 2457 } 2458 }; 2459 2460 static const char *const iscsi_strong_runtime_opts[] = { 2461 "transport", 2462 "portal", 2463 "target", 2464 "user", 2465 "password", 2466 "password-secret", 2467 "lun", 2468 "initiator-name", 2469 "header-digest", 2470 2471 NULL 2472 }; 2473 2474 static BlockDriver bdrv_iscsi = { 2475 .format_name = "iscsi", 2476 .protocol_name = "iscsi", 2477 2478 .instance_size = sizeof(IscsiLun), 2479 .bdrv_parse_filename = iscsi_parse_filename, 2480 .bdrv_file_open = iscsi_open, 2481 .bdrv_close = iscsi_close, 2482 .bdrv_co_create_opts = iscsi_co_create_opts, 2483 .create_opts = &iscsi_create_opts, 2484 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2485 .bdrv_reopen_commit = iscsi_reopen_commit, 2486 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2487 2488 .bdrv_getlength = iscsi_getlength, 2489 .bdrv_get_info = iscsi_get_info, 2490 .bdrv_co_truncate = iscsi_co_truncate, 2491 .bdrv_refresh_limits = iscsi_refresh_limits, 2492 2493 .bdrv_co_block_status = iscsi_co_block_status, 2494 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2495 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2496 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2497 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2498 .bdrv_co_readv = iscsi_co_readv, 2499 .bdrv_co_writev = iscsi_co_writev, 2500 .bdrv_co_flush_to_disk = iscsi_co_flush, 2501 2502 #ifdef __linux__ 2503 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2504 #endif 2505 2506 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2507 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2508 2509 .strong_runtime_opts = iscsi_strong_runtime_opts, 2510 }; 2511 2512 #if LIBISCSI_API_VERSION >= (20160603) 2513 static BlockDriver bdrv_iser = { 2514 .format_name = "iser", 2515 .protocol_name = "iser", 2516 2517 .instance_size = sizeof(IscsiLun), 2518 .bdrv_parse_filename = iscsi_parse_filename, 2519 .bdrv_file_open = iscsi_open, 2520 .bdrv_close = iscsi_close, 2521 .bdrv_co_create_opts = iscsi_co_create_opts, 2522 .create_opts = &iscsi_create_opts, 2523 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2524 .bdrv_reopen_commit = iscsi_reopen_commit, 2525 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2526 2527 .bdrv_getlength = iscsi_getlength, 2528 .bdrv_get_info = iscsi_get_info, 2529 .bdrv_co_truncate = iscsi_co_truncate, 2530 .bdrv_refresh_limits = iscsi_refresh_limits, 2531 2532 .bdrv_co_block_status = iscsi_co_block_status, 2533 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2534 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2535 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2536 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2537 .bdrv_co_readv = iscsi_co_readv, 2538 .bdrv_co_writev = iscsi_co_writev, 2539 .bdrv_co_flush_to_disk = iscsi_co_flush, 2540 2541 #ifdef __linux__ 2542 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2543 #endif 2544 2545 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2546 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2547 2548 .strong_runtime_opts = iscsi_strong_runtime_opts, 2549 }; 2550 #endif 2551 2552 static void iscsi_block_init(void) 2553 { 2554 bdrv_register(&bdrv_iscsi); 2555 #if LIBISCSI_API_VERSION >= (20160603) 2556 bdrv_register(&bdrv_iser); 2557 #endif 2558 } 2559 2560 block_init(iscsi_block_init); 2561