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 "scsi/constants.h" 37 #include "qemu/iov.h" 38 #include "qemu/option.h" 39 #include "qemu/uuid.h" 40 #include "qapi/error.h" 41 #include "qapi/qapi-commands-misc.h" 42 #include "qapi/qmp/qdict.h" 43 #include "qapi/qmp/qstring.h" 44 #include "crypto/secret.h" 45 #include "scsi/utils.h" 46 47 /* Conflict between scsi/utils.h and libiscsi! :( */ 48 #define SCSI_XFER_NONE ISCSI_XFER_NONE 49 #include <iscsi/iscsi.h> 50 #include <iscsi/scsi-lowlevel.h> 51 #undef SCSI_XFER_NONE 52 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 53 54 #ifdef __linux__ 55 #include <scsi/sg.h> 56 #endif 57 58 typedef struct IscsiLun { 59 struct iscsi_context *iscsi; 60 AioContext *aio_context; 61 int lun; 62 enum scsi_inquiry_peripheral_device_type type; 63 int block_size; 64 uint64_t num_blocks; 65 int events; 66 QEMUTimer *nop_timer; 67 QEMUTimer *event_timer; 68 QemuMutex mutex; 69 struct scsi_inquiry_logical_block_provisioning lbp; 70 struct scsi_inquiry_block_limits bl; 71 struct scsi_inquiry_device_designator *dd; 72 unsigned char *zeroblock; 73 /* The allocmap tracks which clusters (pages) on the iSCSI target are 74 * allocated and which are not. In case a target returns zeros for 75 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 76 * of reading zeros over the wire if a read request falls within an 77 * unallocated block. As there are 3 possible states we need 2 bitmaps to 78 * track. allocmap_valid keeps track if QEMU's information about a page is 79 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 80 * valid information about a page the corresponding allocmap entry should be 81 * switched to unallocated as well to force a new lookup of the allocation 82 * status as lookups are generally skipped if a page is suspect to be 83 * allocated. If a iSCSI target is opened with cache.direct = on the 84 * allocmap_valid does not exist turning all cached information invalid so 85 * that a fresh lookup is made for any page even if allocmap entry returns 86 * it's unallocated. */ 87 unsigned long *allocmap; 88 unsigned long *allocmap_valid; 89 long allocmap_size; 90 int cluster_size; 91 bool use_16_for_rw; 92 bool write_protected; 93 bool lbpme; 94 bool lbprz; 95 bool dpofua; 96 bool has_write_same; 97 bool request_timed_out; 98 } IscsiLun; 99 100 typedef struct IscsiTask { 101 int status; 102 int complete; 103 int retries; 104 int do_retry; 105 struct scsi_task *task; 106 Coroutine *co; 107 IscsiLun *iscsilun; 108 QEMUTimer retry_timer; 109 int err_code; 110 char *err_str; 111 } IscsiTask; 112 113 typedef struct IscsiAIOCB { 114 BlockAIOCB common; 115 QEMUBH *bh; 116 IscsiLun *iscsilun; 117 struct scsi_task *task; 118 uint8_t *buf; 119 int status; 120 int64_t sector_num; 121 int nb_sectors; 122 int ret; 123 #ifdef __linux__ 124 sg_io_hdr_t *ioh; 125 #endif 126 } IscsiAIOCB; 127 128 /* libiscsi uses time_t so its enough to process events every second */ 129 #define EVENT_INTERVAL 1000 130 #define NOP_INTERVAL 5000 131 #define MAX_NOP_FAILURES 3 132 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 133 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 134 135 /* this threshold is a trade-off knob to choose between 136 * the potential additional overhead of an extra GET_LBA_STATUS request 137 * vs. unnecessarily reading a lot of zero sectors over the wire. 138 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 139 * sectors we check the allocation status of the area covered by the 140 * request first if the allocationmap indicates that the area might be 141 * unallocated. */ 142 #define ISCSI_CHECKALLOC_THRES 64 143 144 static void 145 iscsi_bh_cb(void *p) 146 { 147 IscsiAIOCB *acb = p; 148 149 qemu_bh_delete(acb->bh); 150 151 g_free(acb->buf); 152 acb->buf = NULL; 153 154 acb->common.cb(acb->common.opaque, acb->status); 155 156 if (acb->task != NULL) { 157 scsi_free_scsi_task(acb->task); 158 acb->task = NULL; 159 } 160 161 qemu_aio_unref(acb); 162 } 163 164 static void 165 iscsi_schedule_bh(IscsiAIOCB *acb) 166 { 167 if (acb->bh) { 168 return; 169 } 170 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 171 qemu_bh_schedule(acb->bh); 172 } 173 174 static void iscsi_co_generic_bh_cb(void *opaque) 175 { 176 struct IscsiTask *iTask = opaque; 177 178 iTask->complete = 1; 179 aio_co_wake(iTask->co); 180 } 181 182 static void iscsi_retry_timer_expired(void *opaque) 183 { 184 struct IscsiTask *iTask = opaque; 185 iTask->complete = 1; 186 if (iTask->co) { 187 aio_co_wake(iTask->co); 188 } 189 } 190 191 static inline unsigned exp_random(double mean) 192 { 193 return -mean * log((double)rand() / RAND_MAX); 194 } 195 196 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 197 * libiscsi 1.10.0, together with other constants we need. Use it as 198 * a hint that we have to define them ourselves if needed, to keep the 199 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 200 * the test because SCSI_STATUS_* is an enum. 201 * 202 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 203 * an enum, check against the LIBISCSI_API_VERSION macro, which was 204 * introduced in 1.11.0. If it is present, there is no need to define 205 * anything. 206 */ 207 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 208 !defined(LIBISCSI_API_VERSION) 209 #define SCSI_STATUS_TASK_SET_FULL 0x28 210 #define SCSI_STATUS_TIMEOUT 0x0f000002 211 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 212 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 213 #endif 214 215 #ifndef LIBISCSI_API_VERSION 216 #define LIBISCSI_API_VERSION 20130701 217 #endif 218 219 static int iscsi_translate_sense(struct scsi_sense *sense) 220 { 221 return - scsi_sense_to_errno(sense->key, 222 (sense->ascq & 0xFF00) >> 8, 223 sense->ascq & 0xFF); 224 } 225 226 /* Called (via iscsi_service) with QemuMutex held. */ 227 static void 228 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 229 void *command_data, void *opaque) 230 { 231 struct IscsiTask *iTask = opaque; 232 struct scsi_task *task = command_data; 233 234 iTask->status = status; 235 iTask->do_retry = 0; 236 iTask->task = task; 237 238 if (status != SCSI_STATUS_GOOD) { 239 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 240 if (status == SCSI_STATUS_CHECK_CONDITION 241 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 242 error_report("iSCSI CheckCondition: %s", 243 iscsi_get_error(iscsi)); 244 iTask->do_retry = 1; 245 goto out; 246 } 247 if (status == SCSI_STATUS_BUSY || 248 status == SCSI_STATUS_TIMEOUT || 249 status == SCSI_STATUS_TASK_SET_FULL) { 250 unsigned retry_time = 251 exp_random(iscsi_retry_times[iTask->retries - 1]); 252 if (status == SCSI_STATUS_TIMEOUT) { 253 /* make sure the request is rescheduled AFTER the 254 * reconnect is initiated */ 255 retry_time = EVENT_INTERVAL * 2; 256 iTask->iscsilun->request_timed_out = true; 257 } 258 error_report("iSCSI Busy/TaskSetFull/TimeOut" 259 " (retry #%u in %u ms): %s", 260 iTask->retries, retry_time, 261 iscsi_get_error(iscsi)); 262 aio_timer_init(iTask->iscsilun->aio_context, 263 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 264 SCALE_MS, iscsi_retry_timer_expired, iTask); 265 timer_mod(&iTask->retry_timer, 266 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 267 iTask->do_retry = 1; 268 return; 269 } 270 } 271 iTask->err_code = iscsi_translate_sense(&task->sense); 272 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 273 } 274 275 out: 276 if (iTask->co) { 277 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 278 iscsi_co_generic_bh_cb, iTask); 279 } else { 280 iTask->complete = 1; 281 } 282 } 283 284 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 285 { 286 *iTask = (struct IscsiTask) { 287 .co = qemu_coroutine_self(), 288 .iscsilun = iscsilun, 289 }; 290 } 291 292 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 acb->status = -ECANCELED; 299 iscsi_schedule_bh(acb); 300 } 301 302 static void 303 iscsi_aio_cancel(BlockAIOCB *blockacb) 304 { 305 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 306 IscsiLun *iscsilun = acb->iscsilun; 307 308 if (acb->status != -EINPROGRESS) { 309 return; 310 } 311 312 /* send a task mgmt call to the target to cancel the task on the target */ 313 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 314 iscsi_abort_task_cb, acb); 315 316 } 317 318 static const AIOCBInfo iscsi_aiocb_info = { 319 .aiocb_size = sizeof(IscsiAIOCB), 320 .cancel_async = iscsi_aio_cancel, 321 }; 322 323 324 static void iscsi_process_read(void *arg); 325 static void iscsi_process_write(void *arg); 326 327 /* Called with QemuMutex held. */ 328 static void 329 iscsi_set_events(IscsiLun *iscsilun) 330 { 331 struct iscsi_context *iscsi = iscsilun->iscsi; 332 int ev = iscsi_which_events(iscsi); 333 334 if (ev != iscsilun->events) { 335 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 336 false, 337 (ev & POLLIN) ? iscsi_process_read : NULL, 338 (ev & POLLOUT) ? iscsi_process_write : NULL, 339 NULL, 340 iscsilun); 341 iscsilun->events = ev; 342 } 343 } 344 345 static void iscsi_timed_check_events(void *opaque) 346 { 347 IscsiLun *iscsilun = opaque; 348 349 /* check for timed out requests */ 350 iscsi_service(iscsilun->iscsi, 0); 351 352 if (iscsilun->request_timed_out) { 353 iscsilun->request_timed_out = false; 354 iscsi_reconnect(iscsilun->iscsi); 355 } 356 357 /* newer versions of libiscsi may return zero events. Ensure we are able 358 * to return to service once this situation changes. */ 359 iscsi_set_events(iscsilun); 360 361 timer_mod(iscsilun->event_timer, 362 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 363 } 364 365 static void 366 iscsi_process_read(void *arg) 367 { 368 IscsiLun *iscsilun = arg; 369 struct iscsi_context *iscsi = iscsilun->iscsi; 370 371 qemu_mutex_lock(&iscsilun->mutex); 372 iscsi_service(iscsi, POLLIN); 373 iscsi_set_events(iscsilun); 374 qemu_mutex_unlock(&iscsilun->mutex); 375 } 376 377 static void 378 iscsi_process_write(void *arg) 379 { 380 IscsiLun *iscsilun = arg; 381 struct iscsi_context *iscsi = iscsilun->iscsi; 382 383 qemu_mutex_lock(&iscsilun->mutex); 384 iscsi_service(iscsi, POLLOUT); 385 iscsi_set_events(iscsilun); 386 qemu_mutex_unlock(&iscsilun->mutex); 387 } 388 389 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 390 { 391 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 392 } 393 394 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 395 { 396 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 397 } 398 399 static bool is_byte_request_lun_aligned(int64_t offset, int count, 400 IscsiLun *iscsilun) 401 { 402 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 403 error_report("iSCSI misaligned request: " 404 "iscsilun->block_size %u, offset %" PRIi64 405 ", count %d", 406 iscsilun->block_size, offset, count); 407 return false; 408 } 409 return true; 410 } 411 412 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 413 IscsiLun *iscsilun) 414 { 415 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 416 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 417 nb_sectors << BDRV_SECTOR_BITS, 418 iscsilun); 419 } 420 421 static void iscsi_allocmap_free(IscsiLun *iscsilun) 422 { 423 g_free(iscsilun->allocmap); 424 g_free(iscsilun->allocmap_valid); 425 iscsilun->allocmap = NULL; 426 iscsilun->allocmap_valid = NULL; 427 } 428 429 430 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 431 { 432 iscsi_allocmap_free(iscsilun); 433 434 assert(iscsilun->cluster_size); 435 iscsilun->allocmap_size = 436 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 437 iscsilun->cluster_size); 438 439 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 440 if (!iscsilun->allocmap) { 441 return -ENOMEM; 442 } 443 444 if (open_flags & BDRV_O_NOCACHE) { 445 /* when cache.direct = on all allocmap entries are 446 * treated as invalid to force a relookup of the block 447 * status on every read request */ 448 return 0; 449 } 450 451 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 452 if (!iscsilun->allocmap_valid) { 453 /* if we are under memory pressure free the allocmap as well */ 454 iscsi_allocmap_free(iscsilun); 455 return -ENOMEM; 456 } 457 458 return 0; 459 } 460 461 static void 462 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 463 int64_t bytes, bool allocated, bool valid) 464 { 465 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 466 467 if (iscsilun->allocmap == NULL) { 468 return; 469 } 470 /* expand to entirely contain all affected clusters */ 471 assert(iscsilun->cluster_size); 472 cl_num_expanded = offset / iscsilun->cluster_size; 473 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 474 iscsilun->cluster_size) - cl_num_expanded; 475 /* shrink to touch only completely contained clusters */ 476 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 477 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 478 if (allocated) { 479 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 480 } else { 481 if (nb_cls_shrunk > 0) { 482 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 483 } 484 } 485 486 if (iscsilun->allocmap_valid == NULL) { 487 return; 488 } 489 if (valid) { 490 if (nb_cls_shrunk > 0) { 491 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 492 } 493 } else { 494 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 495 nb_cls_expanded); 496 } 497 } 498 499 static void 500 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 501 int64_t bytes) 502 { 503 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 504 } 505 506 static void 507 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 508 int64_t bytes) 509 { 510 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 511 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 512 */ 513 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 514 } 515 516 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 517 int64_t bytes) 518 { 519 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 520 } 521 522 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 523 { 524 if (iscsilun->allocmap) { 525 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 526 } 527 if (iscsilun->allocmap_valid) { 528 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 529 } 530 } 531 532 static inline bool 533 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 534 int64_t bytes) 535 { 536 unsigned long size; 537 if (iscsilun->allocmap == NULL) { 538 return true; 539 } 540 assert(iscsilun->cluster_size); 541 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 542 return !(find_next_bit(iscsilun->allocmap, size, 543 offset / iscsilun->cluster_size) == size); 544 } 545 546 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 547 int64_t offset, int64_t bytes) 548 { 549 unsigned long size; 550 if (iscsilun->allocmap_valid == NULL) { 551 return false; 552 } 553 assert(iscsilun->cluster_size); 554 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 555 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 556 offset / iscsilun->cluster_size) == size); 557 } 558 559 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 560 IscsiLun *iscsilun) 561 { 562 while (!iTask->complete) { 563 iscsi_set_events(iscsilun); 564 qemu_mutex_unlock(&iscsilun->mutex); 565 qemu_coroutine_yield(); 566 qemu_mutex_lock(&iscsilun->mutex); 567 } 568 } 569 570 static int coroutine_fn 571 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 572 QEMUIOVector *iov, int flags) 573 { 574 IscsiLun *iscsilun = bs->opaque; 575 struct IscsiTask iTask; 576 uint64_t lba; 577 uint32_t num_sectors; 578 bool fua = flags & BDRV_REQ_FUA; 579 int r = 0; 580 581 if (fua) { 582 assert(iscsilun->dpofua); 583 } 584 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 585 return -EINVAL; 586 } 587 588 if (bs->bl.max_transfer) { 589 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 590 } 591 592 lba = sector_qemu2lun(sector_num, iscsilun); 593 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 594 iscsi_co_init_iscsitask(iscsilun, &iTask); 595 qemu_mutex_lock(&iscsilun->mutex); 596 retry: 597 if (iscsilun->use_16_for_rw) { 598 #if LIBISCSI_API_VERSION >= (20160603) 599 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 600 NULL, num_sectors * iscsilun->block_size, 601 iscsilun->block_size, 0, 0, fua, 0, 0, 602 iscsi_co_generic_cb, &iTask, 603 (struct scsi_iovec *)iov->iov, iov->niov); 604 } else { 605 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 606 NULL, num_sectors * iscsilun->block_size, 607 iscsilun->block_size, 0, 0, fua, 0, 0, 608 iscsi_co_generic_cb, &iTask, 609 (struct scsi_iovec *)iov->iov, iov->niov); 610 } 611 #else 612 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 613 NULL, num_sectors * iscsilun->block_size, 614 iscsilun->block_size, 0, 0, fua, 0, 0, 615 iscsi_co_generic_cb, &iTask); 616 } else { 617 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 618 NULL, num_sectors * iscsilun->block_size, 619 iscsilun->block_size, 0, 0, fua, 0, 0, 620 iscsi_co_generic_cb, &iTask); 621 } 622 #endif 623 if (iTask.task == NULL) { 624 qemu_mutex_unlock(&iscsilun->mutex); 625 return -ENOMEM; 626 } 627 #if LIBISCSI_API_VERSION < (20160603) 628 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 629 iov->niov); 630 #endif 631 iscsi_co_wait_for_task(&iTask, iscsilun); 632 633 if (iTask.task != NULL) { 634 scsi_free_scsi_task(iTask.task); 635 iTask.task = NULL; 636 } 637 638 if (iTask.do_retry) { 639 iTask.complete = 0; 640 goto retry; 641 } 642 643 if (iTask.status != SCSI_STATUS_GOOD) { 644 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 645 nb_sectors * BDRV_SECTOR_SIZE); 646 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 647 iTask.err_str); 648 r = iTask.err_code; 649 goto out_unlock; 650 } 651 652 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 653 nb_sectors * BDRV_SECTOR_SIZE); 654 655 out_unlock: 656 qemu_mutex_unlock(&iscsilun->mutex); 657 g_free(iTask.err_str); 658 return r; 659 } 660 661 662 663 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 664 bool want_zero, int64_t offset, 665 int64_t bytes, int64_t *pnum, 666 int64_t *map, 667 BlockDriverState **file) 668 { 669 IscsiLun *iscsilun = bs->opaque; 670 struct scsi_get_lba_status *lbas = NULL; 671 struct scsi_lba_status_descriptor *lbasd = NULL; 672 struct IscsiTask iTask; 673 uint64_t lba; 674 int ret; 675 676 iscsi_co_init_iscsitask(iscsilun, &iTask); 677 678 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 679 680 /* default to all sectors allocated */ 681 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 682 if (map) { 683 *map = offset; 684 } 685 *pnum = bytes; 686 687 /* LUN does not support logical block provisioning */ 688 if (!iscsilun->lbpme) { 689 goto out; 690 } 691 692 lba = offset / iscsilun->block_size; 693 694 qemu_mutex_lock(&iscsilun->mutex); 695 retry: 696 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 697 lba, 8 + 16, iscsi_co_generic_cb, 698 &iTask) == NULL) { 699 ret = -ENOMEM; 700 goto out_unlock; 701 } 702 iscsi_co_wait_for_task(&iTask, iscsilun); 703 704 if (iTask.do_retry) { 705 if (iTask.task != NULL) { 706 scsi_free_scsi_task(iTask.task); 707 iTask.task = NULL; 708 } 709 iTask.complete = 0; 710 goto retry; 711 } 712 713 if (iTask.status != SCSI_STATUS_GOOD) { 714 /* in case the get_lba_status_callout fails (i.e. 715 * because the device is busy or the cmd is not 716 * supported) we pretend all blocks are allocated 717 * for backwards compatibility */ 718 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 719 lba, iTask.err_str); 720 goto out_unlock; 721 } 722 723 lbas = scsi_datain_unmarshall(iTask.task); 724 if (lbas == NULL) { 725 ret = -EIO; 726 goto out_unlock; 727 } 728 729 lbasd = &lbas->descriptors[0]; 730 731 if (lba != lbasd->lba) { 732 ret = -EIO; 733 goto out_unlock; 734 } 735 736 *pnum = lbasd->num_blocks * iscsilun->block_size; 737 738 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 739 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 740 ret &= ~BDRV_BLOCK_DATA; 741 if (iscsilun->lbprz) { 742 ret |= BDRV_BLOCK_ZERO; 743 } 744 } 745 746 if (ret & BDRV_BLOCK_ZERO) { 747 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 748 } else { 749 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 750 } 751 752 if (*pnum > bytes) { 753 *pnum = bytes; 754 } 755 out_unlock: 756 qemu_mutex_unlock(&iscsilun->mutex); 757 g_free(iTask.err_str); 758 out: 759 if (iTask.task != NULL) { 760 scsi_free_scsi_task(iTask.task); 761 } 762 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 763 *file = bs; 764 } 765 return ret; 766 } 767 768 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 769 int64_t sector_num, int nb_sectors, 770 QEMUIOVector *iov) 771 { 772 IscsiLun *iscsilun = bs->opaque; 773 struct IscsiTask iTask; 774 uint64_t lba; 775 uint32_t num_sectors; 776 int r = 0; 777 778 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 779 return -EINVAL; 780 } 781 782 if (bs->bl.max_transfer) { 783 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 784 } 785 786 /* if cache.direct is off and we have a valid entry in our allocation map 787 * we can skip checking the block status and directly return zeroes if 788 * the request falls within an unallocated area */ 789 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 790 nb_sectors * BDRV_SECTOR_SIZE) && 791 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 792 nb_sectors * BDRV_SECTOR_SIZE)) { 793 qemu_iovec_memset(iov, 0, 0x00, iov->size); 794 return 0; 795 } 796 797 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 798 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 799 nb_sectors * BDRV_SECTOR_SIZE) && 800 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 801 nb_sectors * BDRV_SECTOR_SIZE)) { 802 int64_t pnum; 803 /* check the block status from the beginning of the cluster 804 * containing the start sector */ 805 int64_t head; 806 int ret; 807 808 assert(iscsilun->cluster_size); 809 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 810 ret = iscsi_co_block_status(bs, true, 811 sector_num * BDRV_SECTOR_SIZE - head, 812 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 813 if (ret < 0) { 814 return ret; 815 } 816 /* if the whole request falls into an unallocated area we can avoid 817 * reading and directly return zeroes instead */ 818 if (ret & BDRV_BLOCK_ZERO && 819 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 820 qemu_iovec_memset(iov, 0, 0x00, iov->size); 821 return 0; 822 } 823 } 824 825 lba = sector_qemu2lun(sector_num, iscsilun); 826 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 827 828 iscsi_co_init_iscsitask(iscsilun, &iTask); 829 qemu_mutex_lock(&iscsilun->mutex); 830 retry: 831 if (iscsilun->use_16_for_rw) { 832 #if LIBISCSI_API_VERSION >= (20160603) 833 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 834 num_sectors * iscsilun->block_size, 835 iscsilun->block_size, 0, 0, 0, 0, 0, 836 iscsi_co_generic_cb, &iTask, 837 (struct scsi_iovec *)iov->iov, iov->niov); 838 } else { 839 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 840 num_sectors * iscsilun->block_size, 841 iscsilun->block_size, 842 0, 0, 0, 0, 0, 843 iscsi_co_generic_cb, &iTask, 844 (struct scsi_iovec *)iov->iov, iov->niov); 845 } 846 #else 847 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 848 num_sectors * iscsilun->block_size, 849 iscsilun->block_size, 0, 0, 0, 0, 0, 850 iscsi_co_generic_cb, &iTask); 851 } else { 852 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 853 num_sectors * iscsilun->block_size, 854 iscsilun->block_size, 855 0, 0, 0, 0, 0, 856 iscsi_co_generic_cb, &iTask); 857 } 858 #endif 859 if (iTask.task == NULL) { 860 qemu_mutex_unlock(&iscsilun->mutex); 861 return -ENOMEM; 862 } 863 #if LIBISCSI_API_VERSION < (20160603) 864 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 865 #endif 866 867 iscsi_co_wait_for_task(&iTask, iscsilun); 868 if (iTask.task != NULL) { 869 scsi_free_scsi_task(iTask.task); 870 iTask.task = NULL; 871 } 872 873 if (iTask.do_retry) { 874 iTask.complete = 0; 875 goto retry; 876 } 877 878 if (iTask.status != SCSI_STATUS_GOOD) { 879 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 880 lba, iTask.err_str); 881 r = iTask.err_code; 882 } 883 884 qemu_mutex_unlock(&iscsilun->mutex); 885 g_free(iTask.err_str); 886 return r; 887 } 888 889 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 890 { 891 IscsiLun *iscsilun = bs->opaque; 892 struct IscsiTask iTask; 893 int r = 0; 894 895 iscsi_co_init_iscsitask(iscsilun, &iTask); 896 qemu_mutex_lock(&iscsilun->mutex); 897 retry: 898 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 899 0, iscsi_co_generic_cb, &iTask) == NULL) { 900 qemu_mutex_unlock(&iscsilun->mutex); 901 return -ENOMEM; 902 } 903 904 iscsi_co_wait_for_task(&iTask, iscsilun); 905 906 if (iTask.task != NULL) { 907 scsi_free_scsi_task(iTask.task); 908 iTask.task = NULL; 909 } 910 911 if (iTask.do_retry) { 912 iTask.complete = 0; 913 goto retry; 914 } 915 916 if (iTask.status != SCSI_STATUS_GOOD) { 917 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 918 r = iTask.err_code; 919 } 920 921 qemu_mutex_unlock(&iscsilun->mutex); 922 g_free(iTask.err_str); 923 return r; 924 } 925 926 #ifdef __linux__ 927 /* Called (via iscsi_service) with QemuMutex held. */ 928 static void 929 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 930 void *command_data, void *opaque) 931 { 932 IscsiAIOCB *acb = opaque; 933 934 g_free(acb->buf); 935 acb->buf = NULL; 936 937 acb->status = 0; 938 if (status < 0) { 939 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 940 iscsi_get_error(iscsi)); 941 acb->status = iscsi_translate_sense(&acb->task->sense); 942 } 943 944 acb->ioh->driver_status = 0; 945 acb->ioh->host_status = 0; 946 acb->ioh->resid = 0; 947 acb->ioh->status = status; 948 949 #define SG_ERR_DRIVER_SENSE 0x08 950 951 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 952 int ss; 953 954 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 955 956 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 957 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 958 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 959 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 960 } 961 962 iscsi_schedule_bh(acb); 963 } 964 965 static void iscsi_ioctl_bh_completion(void *opaque) 966 { 967 IscsiAIOCB *acb = opaque; 968 969 qemu_bh_delete(acb->bh); 970 acb->common.cb(acb->common.opaque, acb->ret); 971 qemu_aio_unref(acb); 972 } 973 974 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 975 { 976 BlockDriverState *bs = acb->common.bs; 977 IscsiLun *iscsilun = bs->opaque; 978 int ret = 0; 979 980 switch (req) { 981 case SG_GET_VERSION_NUM: 982 *(int *)buf = 30000; 983 break; 984 case SG_GET_SCSI_ID: 985 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 986 break; 987 default: 988 ret = -EINVAL; 989 } 990 assert(!acb->bh); 991 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 992 iscsi_ioctl_bh_completion, acb); 993 acb->ret = ret; 994 qemu_bh_schedule(acb->bh); 995 } 996 997 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 998 unsigned long int req, void *buf, 999 BlockCompletionFunc *cb, void *opaque) 1000 { 1001 IscsiLun *iscsilun = bs->opaque; 1002 struct iscsi_context *iscsi = iscsilun->iscsi; 1003 struct iscsi_data data; 1004 IscsiAIOCB *acb; 1005 1006 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1007 1008 acb->iscsilun = iscsilun; 1009 acb->bh = NULL; 1010 acb->status = -EINPROGRESS; 1011 acb->buf = NULL; 1012 acb->ioh = buf; 1013 1014 if (req != SG_IO) { 1015 iscsi_ioctl_handle_emulated(acb, req, buf); 1016 return &acb->common; 1017 } 1018 1019 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1020 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1021 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1022 qemu_aio_unref(acb); 1023 return NULL; 1024 } 1025 1026 acb->task = malloc(sizeof(struct scsi_task)); 1027 if (acb->task == NULL) { 1028 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1029 iscsi_get_error(iscsi)); 1030 qemu_aio_unref(acb); 1031 return NULL; 1032 } 1033 memset(acb->task, 0, sizeof(struct scsi_task)); 1034 1035 switch (acb->ioh->dxfer_direction) { 1036 case SG_DXFER_TO_DEV: 1037 acb->task->xfer_dir = SCSI_XFER_WRITE; 1038 break; 1039 case SG_DXFER_FROM_DEV: 1040 acb->task->xfer_dir = SCSI_XFER_READ; 1041 break; 1042 default: 1043 acb->task->xfer_dir = SCSI_XFER_NONE; 1044 break; 1045 } 1046 1047 acb->task->cdb_size = acb->ioh->cmd_len; 1048 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1049 acb->task->expxferlen = acb->ioh->dxfer_len; 1050 1051 data.size = 0; 1052 qemu_mutex_lock(&iscsilun->mutex); 1053 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1054 if (acb->ioh->iovec_count == 0) { 1055 data.data = acb->ioh->dxferp; 1056 data.size = acb->ioh->dxfer_len; 1057 } else { 1058 scsi_task_set_iov_out(acb->task, 1059 (struct scsi_iovec *) acb->ioh->dxferp, 1060 acb->ioh->iovec_count); 1061 } 1062 } 1063 1064 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1065 iscsi_aio_ioctl_cb, 1066 (data.size > 0) ? &data : NULL, 1067 acb) != 0) { 1068 qemu_mutex_unlock(&iscsilun->mutex); 1069 scsi_free_scsi_task(acb->task); 1070 qemu_aio_unref(acb); 1071 return NULL; 1072 } 1073 1074 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1075 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1076 if (acb->ioh->iovec_count == 0) { 1077 scsi_task_add_data_in_buffer(acb->task, 1078 acb->ioh->dxfer_len, 1079 acb->ioh->dxferp); 1080 } else { 1081 scsi_task_set_iov_in(acb->task, 1082 (struct scsi_iovec *) acb->ioh->dxferp, 1083 acb->ioh->iovec_count); 1084 } 1085 } 1086 1087 iscsi_set_events(iscsilun); 1088 qemu_mutex_unlock(&iscsilun->mutex); 1089 1090 return &acb->common; 1091 } 1092 1093 #endif 1094 1095 static int64_t 1096 iscsi_getlength(BlockDriverState *bs) 1097 { 1098 IscsiLun *iscsilun = bs->opaque; 1099 int64_t len; 1100 1101 len = iscsilun->num_blocks; 1102 len *= iscsilun->block_size; 1103 1104 return len; 1105 } 1106 1107 static int 1108 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1109 { 1110 IscsiLun *iscsilun = bs->opaque; 1111 struct IscsiTask iTask; 1112 struct unmap_list list; 1113 int r = 0; 1114 1115 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1116 return -ENOTSUP; 1117 } 1118 1119 if (!iscsilun->lbp.lbpu) { 1120 /* UNMAP is not supported by the target */ 1121 return 0; 1122 } 1123 1124 list.lba = offset / iscsilun->block_size; 1125 list.num = bytes / iscsilun->block_size; 1126 1127 iscsi_co_init_iscsitask(iscsilun, &iTask); 1128 qemu_mutex_lock(&iscsilun->mutex); 1129 retry: 1130 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1131 iscsi_co_generic_cb, &iTask) == NULL) { 1132 r = -ENOMEM; 1133 goto out_unlock; 1134 } 1135 1136 iscsi_co_wait_for_task(&iTask, iscsilun); 1137 1138 if (iTask.task != NULL) { 1139 scsi_free_scsi_task(iTask.task); 1140 iTask.task = NULL; 1141 } 1142 1143 if (iTask.do_retry) { 1144 iTask.complete = 0; 1145 goto retry; 1146 } 1147 1148 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1149 1150 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1151 /* the target might fail with a check condition if it 1152 is not happy with the alignment of the UNMAP request 1153 we silently fail in this case */ 1154 goto out_unlock; 1155 } 1156 1157 if (iTask.status != SCSI_STATUS_GOOD) { 1158 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1159 list.lba, iTask.err_str); 1160 r = iTask.err_code; 1161 goto out_unlock; 1162 } 1163 1164 out_unlock: 1165 qemu_mutex_unlock(&iscsilun->mutex); 1166 g_free(iTask.err_str); 1167 return r; 1168 } 1169 1170 static int 1171 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1172 int bytes, BdrvRequestFlags flags) 1173 { 1174 IscsiLun *iscsilun = bs->opaque; 1175 struct IscsiTask iTask; 1176 uint64_t lba; 1177 uint32_t nb_blocks; 1178 bool use_16_for_ws = iscsilun->use_16_for_rw; 1179 int r = 0; 1180 1181 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1182 return -ENOTSUP; 1183 } 1184 1185 if (flags & BDRV_REQ_MAY_UNMAP) { 1186 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1187 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1188 use_16_for_ws = true; 1189 } 1190 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1191 /* WRITESAME16 with UNMAP is not supported by the target, 1192 * fall back and try WRITESAME10/16 without UNMAP */ 1193 flags &= ~BDRV_REQ_MAY_UNMAP; 1194 use_16_for_ws = iscsilun->use_16_for_rw; 1195 } 1196 } 1197 1198 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1199 /* WRITESAME without UNMAP is not supported by the target */ 1200 return -ENOTSUP; 1201 } 1202 1203 lba = offset / iscsilun->block_size; 1204 nb_blocks = bytes / iscsilun->block_size; 1205 1206 if (iscsilun->zeroblock == NULL) { 1207 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1208 if (iscsilun->zeroblock == NULL) { 1209 return -ENOMEM; 1210 } 1211 } 1212 1213 qemu_mutex_lock(&iscsilun->mutex); 1214 iscsi_co_init_iscsitask(iscsilun, &iTask); 1215 retry: 1216 if (use_16_for_ws) { 1217 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1218 iscsilun->zeroblock, iscsilun->block_size, 1219 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1220 0, 0, iscsi_co_generic_cb, &iTask); 1221 } else { 1222 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1223 iscsilun->zeroblock, iscsilun->block_size, 1224 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1225 0, 0, iscsi_co_generic_cb, &iTask); 1226 } 1227 if (iTask.task == NULL) { 1228 qemu_mutex_unlock(&iscsilun->mutex); 1229 return -ENOMEM; 1230 } 1231 1232 iscsi_co_wait_for_task(&iTask, iscsilun); 1233 1234 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1235 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1236 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1237 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1238 /* WRITE SAME is not supported by the target */ 1239 iscsilun->has_write_same = false; 1240 scsi_free_scsi_task(iTask.task); 1241 r = -ENOTSUP; 1242 goto out_unlock; 1243 } 1244 1245 if (iTask.task != NULL) { 1246 scsi_free_scsi_task(iTask.task); 1247 iTask.task = NULL; 1248 } 1249 1250 if (iTask.do_retry) { 1251 iTask.complete = 0; 1252 goto retry; 1253 } 1254 1255 if (iTask.status != SCSI_STATUS_GOOD) { 1256 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1257 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1258 lba, iTask.err_str); 1259 r = iTask.err_code; 1260 goto out_unlock; 1261 } 1262 1263 if (flags & BDRV_REQ_MAY_UNMAP) { 1264 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1265 } else { 1266 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1267 } 1268 1269 out_unlock: 1270 qemu_mutex_unlock(&iscsilun->mutex); 1271 g_free(iTask.err_str); 1272 return r; 1273 } 1274 1275 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1276 Error **errp) 1277 { 1278 const char *user = NULL; 1279 const char *password = NULL; 1280 const char *secretid; 1281 char *secret = NULL; 1282 1283 user = qemu_opt_get(opts, "user"); 1284 if (!user) { 1285 return; 1286 } 1287 1288 secretid = qemu_opt_get(opts, "password-secret"); 1289 password = qemu_opt_get(opts, "password"); 1290 if (secretid && password) { 1291 error_setg(errp, "'password' and 'password-secret' properties are " 1292 "mutually exclusive"); 1293 return; 1294 } 1295 if (secretid) { 1296 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1297 if (!secret) { 1298 return; 1299 } 1300 password = secret; 1301 } else if (!password) { 1302 error_setg(errp, "CHAP username specified but no password was given"); 1303 return; 1304 } 1305 1306 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1307 error_setg(errp, "Failed to set initiator username and password"); 1308 } 1309 1310 g_free(secret); 1311 } 1312 1313 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1314 Error **errp) 1315 { 1316 const char *digest = NULL; 1317 1318 digest = qemu_opt_get(opts, "header-digest"); 1319 if (!digest) { 1320 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1321 } else if (!strcmp(digest, "crc32c")) { 1322 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1323 } else if (!strcmp(digest, "none")) { 1324 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1325 } else if (!strcmp(digest, "crc32c-none")) { 1326 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1327 } else if (!strcmp(digest, "none-crc32c")) { 1328 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1329 } else { 1330 error_setg(errp, "Invalid header-digest setting : %s", digest); 1331 } 1332 } 1333 1334 static char *get_initiator_name(QemuOpts *opts) 1335 { 1336 const char *name; 1337 char *iscsi_name; 1338 UuidInfo *uuid_info; 1339 1340 name = qemu_opt_get(opts, "initiator-name"); 1341 if (name) { 1342 return g_strdup(name); 1343 } 1344 1345 uuid_info = qmp_query_uuid(NULL); 1346 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1347 name = qemu_get_vm_name(); 1348 } else { 1349 name = uuid_info->UUID; 1350 } 1351 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1352 name ? ":" : "", name ? name : ""); 1353 qapi_free_UuidInfo(uuid_info); 1354 return iscsi_name; 1355 } 1356 1357 static void iscsi_nop_timed_event(void *opaque) 1358 { 1359 IscsiLun *iscsilun = opaque; 1360 1361 qemu_mutex_lock(&iscsilun->mutex); 1362 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1363 error_report("iSCSI: NOP timeout. Reconnecting..."); 1364 iscsilun->request_timed_out = true; 1365 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1366 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1367 goto out; 1368 } 1369 1370 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1371 iscsi_set_events(iscsilun); 1372 1373 out: 1374 qemu_mutex_unlock(&iscsilun->mutex); 1375 } 1376 1377 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1378 { 1379 struct scsi_task *task = NULL; 1380 struct scsi_readcapacity10 *rc10 = NULL; 1381 struct scsi_readcapacity16 *rc16 = NULL; 1382 int retries = ISCSI_CMD_RETRIES; 1383 1384 do { 1385 if (task != NULL) { 1386 scsi_free_scsi_task(task); 1387 task = NULL; 1388 } 1389 1390 switch (iscsilun->type) { 1391 case TYPE_DISK: 1392 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1393 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1394 rc16 = scsi_datain_unmarshall(task); 1395 if (rc16 == NULL) { 1396 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1397 } else { 1398 iscsilun->block_size = rc16->block_length; 1399 iscsilun->num_blocks = rc16->returned_lba + 1; 1400 iscsilun->lbpme = !!rc16->lbpme; 1401 iscsilun->lbprz = !!rc16->lbprz; 1402 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1403 } 1404 break; 1405 } 1406 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1407 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1408 break; 1409 } 1410 /* Fall through and try READ CAPACITY(10) instead. */ 1411 case TYPE_ROM: 1412 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1413 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1414 rc10 = scsi_datain_unmarshall(task); 1415 if (rc10 == NULL) { 1416 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1417 } else { 1418 iscsilun->block_size = rc10->block_size; 1419 if (rc10->lba == 0) { 1420 /* blank disk loaded */ 1421 iscsilun->num_blocks = 0; 1422 } else { 1423 iscsilun->num_blocks = rc10->lba + 1; 1424 } 1425 } 1426 } 1427 break; 1428 default: 1429 return; 1430 } 1431 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1432 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1433 && retries-- > 0); 1434 1435 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1436 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1437 } else if (!iscsilun->block_size || 1438 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1439 error_setg(errp, "iSCSI: the target returned an invalid " 1440 "block size of %d.", iscsilun->block_size); 1441 } 1442 if (task) { 1443 scsi_free_scsi_task(task); 1444 } 1445 } 1446 1447 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1448 int evpd, int pc, void **inq, Error **errp) 1449 { 1450 int full_size; 1451 struct scsi_task *task = NULL; 1452 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1453 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1454 goto fail; 1455 } 1456 full_size = scsi_datain_getfullsize(task); 1457 if (full_size > task->datain.size) { 1458 scsi_free_scsi_task(task); 1459 1460 /* we need more data for the full list */ 1461 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1462 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1463 goto fail; 1464 } 1465 } 1466 1467 *inq = scsi_datain_unmarshall(task); 1468 if (*inq == NULL) { 1469 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1470 goto fail_with_err; 1471 } 1472 1473 return task; 1474 1475 fail: 1476 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1477 iscsi_get_error(iscsi)); 1478 fail_with_err: 1479 if (task != NULL) { 1480 scsi_free_scsi_task(task); 1481 } 1482 return NULL; 1483 } 1484 1485 static void iscsi_detach_aio_context(BlockDriverState *bs) 1486 { 1487 IscsiLun *iscsilun = bs->opaque; 1488 1489 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1490 false, NULL, NULL, NULL, NULL); 1491 iscsilun->events = 0; 1492 1493 if (iscsilun->nop_timer) { 1494 timer_del(iscsilun->nop_timer); 1495 timer_free(iscsilun->nop_timer); 1496 iscsilun->nop_timer = NULL; 1497 } 1498 if (iscsilun->event_timer) { 1499 timer_del(iscsilun->event_timer); 1500 timer_free(iscsilun->event_timer); 1501 iscsilun->event_timer = NULL; 1502 } 1503 } 1504 1505 static void iscsi_attach_aio_context(BlockDriverState *bs, 1506 AioContext *new_context) 1507 { 1508 IscsiLun *iscsilun = bs->opaque; 1509 1510 iscsilun->aio_context = new_context; 1511 iscsi_set_events(iscsilun); 1512 1513 /* Set up a timer for sending out iSCSI NOPs */ 1514 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1515 QEMU_CLOCK_REALTIME, SCALE_MS, 1516 iscsi_nop_timed_event, iscsilun); 1517 timer_mod(iscsilun->nop_timer, 1518 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1519 1520 /* Set up a timer for periodic calls to iscsi_set_events and to 1521 * scan for command timeout */ 1522 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1523 QEMU_CLOCK_REALTIME, SCALE_MS, 1524 iscsi_timed_check_events, iscsilun); 1525 timer_mod(iscsilun->event_timer, 1526 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1527 } 1528 1529 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1530 { 1531 struct scsi_task *task; 1532 struct scsi_mode_sense *ms = NULL; 1533 iscsilun->write_protected = false; 1534 iscsilun->dpofua = false; 1535 1536 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1537 1, SCSI_MODESENSE_PC_CURRENT, 1538 0x3F, 0, 255); 1539 if (task == NULL) { 1540 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1541 iscsi_get_error(iscsilun->iscsi)); 1542 goto out; 1543 } 1544 1545 if (task->status != SCSI_STATUS_GOOD) { 1546 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1547 goto out; 1548 } 1549 ms = scsi_datain_unmarshall(task); 1550 if (!ms) { 1551 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1552 iscsi_get_error(iscsilun->iscsi)); 1553 goto out; 1554 } 1555 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1556 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1557 1558 out: 1559 if (task) { 1560 scsi_free_scsi_task(task); 1561 } 1562 } 1563 1564 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1565 { 1566 QemuOptsList *list; 1567 QemuOpts *opts; 1568 const char *user, *password, *password_secret, *initiator_name, 1569 *header_digest, *timeout; 1570 1571 list = qemu_find_opts("iscsi"); 1572 if (!list) { 1573 return; 1574 } 1575 1576 opts = qemu_opts_find(list, target); 1577 if (opts == NULL) { 1578 opts = QTAILQ_FIRST(&list->head); 1579 if (!opts) { 1580 return; 1581 } 1582 } 1583 1584 user = qemu_opt_get(opts, "user"); 1585 if (user) { 1586 qdict_set_default_str(options, "user", user); 1587 } 1588 1589 password = qemu_opt_get(opts, "password"); 1590 if (password) { 1591 qdict_set_default_str(options, "password", password); 1592 } 1593 1594 password_secret = qemu_opt_get(opts, "password-secret"); 1595 if (password_secret) { 1596 qdict_set_default_str(options, "password-secret", password_secret); 1597 } 1598 1599 initiator_name = qemu_opt_get(opts, "initiator-name"); 1600 if (initiator_name) { 1601 qdict_set_default_str(options, "initiator-name", initiator_name); 1602 } 1603 1604 header_digest = qemu_opt_get(opts, "header-digest"); 1605 if (header_digest) { 1606 /* -iscsi takes upper case values, but QAPI only supports lower case 1607 * enum constant names, so we have to convert here. */ 1608 char *qapi_value = g_ascii_strdown(header_digest, -1); 1609 qdict_set_default_str(options, "header-digest", qapi_value); 1610 g_free(qapi_value); 1611 } 1612 1613 timeout = qemu_opt_get(opts, "timeout"); 1614 if (timeout) { 1615 qdict_set_default_str(options, "timeout", timeout); 1616 } 1617 } 1618 1619 /* 1620 * We support iscsi url's on the form 1621 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1622 */ 1623 static void iscsi_parse_filename(const char *filename, QDict *options, 1624 Error **errp) 1625 { 1626 struct iscsi_url *iscsi_url; 1627 const char *transport_name; 1628 char *lun_str; 1629 1630 iscsi_url = iscsi_parse_full_url(NULL, filename); 1631 if (iscsi_url == NULL) { 1632 error_setg(errp, "Failed to parse URL : %s", filename); 1633 return; 1634 } 1635 1636 #if LIBISCSI_API_VERSION >= (20160603) 1637 switch (iscsi_url->transport) { 1638 case TCP_TRANSPORT: 1639 transport_name = "tcp"; 1640 break; 1641 case ISER_TRANSPORT: 1642 transport_name = "iser"; 1643 break; 1644 default: 1645 error_setg(errp, "Unknown transport type (%d)", 1646 iscsi_url->transport); 1647 return; 1648 } 1649 #else 1650 transport_name = "tcp"; 1651 #endif 1652 1653 qdict_set_default_str(options, "transport", transport_name); 1654 qdict_set_default_str(options, "portal", iscsi_url->portal); 1655 qdict_set_default_str(options, "target", iscsi_url->target); 1656 1657 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1658 qdict_set_default_str(options, "lun", lun_str); 1659 g_free(lun_str); 1660 1661 /* User/password from -iscsi take precedence over those from the URL */ 1662 iscsi_parse_iscsi_option(iscsi_url->target, options); 1663 1664 if (iscsi_url->user[0] != '\0') { 1665 qdict_set_default_str(options, "user", iscsi_url->user); 1666 qdict_set_default_str(options, "password", iscsi_url->passwd); 1667 } 1668 1669 iscsi_destroy_url(iscsi_url); 1670 } 1671 1672 static QemuOptsList runtime_opts = { 1673 .name = "iscsi", 1674 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1675 .desc = { 1676 { 1677 .name = "transport", 1678 .type = QEMU_OPT_STRING, 1679 }, 1680 { 1681 .name = "portal", 1682 .type = QEMU_OPT_STRING, 1683 }, 1684 { 1685 .name = "target", 1686 .type = QEMU_OPT_STRING, 1687 }, 1688 { 1689 .name = "user", 1690 .type = QEMU_OPT_STRING, 1691 }, 1692 { 1693 .name = "password", 1694 .type = QEMU_OPT_STRING, 1695 }, 1696 { 1697 .name = "password-secret", 1698 .type = QEMU_OPT_STRING, 1699 }, 1700 { 1701 .name = "lun", 1702 .type = QEMU_OPT_NUMBER, 1703 }, 1704 { 1705 .name = "initiator-name", 1706 .type = QEMU_OPT_STRING, 1707 }, 1708 { 1709 .name = "header-digest", 1710 .type = QEMU_OPT_STRING, 1711 }, 1712 { 1713 .name = "timeout", 1714 .type = QEMU_OPT_NUMBER, 1715 }, 1716 { 1717 .name = "filename", 1718 .type = QEMU_OPT_STRING, 1719 }, 1720 { /* end of list */ } 1721 }, 1722 }; 1723 1724 static void iscsi_save_designator(IscsiLun *lun, 1725 struct scsi_inquiry_device_identification *inq_di) 1726 { 1727 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1728 1729 for (desig = inq_di->designators; desig; desig = desig->next) { 1730 if (desig->association || 1731 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1732 continue; 1733 } 1734 /* NAA works better than T10 vendor ID based designator. */ 1735 if (!copy || copy->designator_type < desig->designator_type) { 1736 copy = desig; 1737 } 1738 } 1739 if (copy) { 1740 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1741 *lun->dd = *copy; 1742 lun->dd->next = NULL; 1743 lun->dd->designator = g_malloc(copy->designator_length); 1744 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1745 } 1746 } 1747 1748 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1749 Error **errp) 1750 { 1751 IscsiLun *iscsilun = bs->opaque; 1752 struct iscsi_context *iscsi = NULL; 1753 struct scsi_task *task = NULL; 1754 struct scsi_inquiry_standard *inq = NULL; 1755 struct scsi_inquiry_supported_pages *inq_vpd; 1756 char *initiator_name = NULL; 1757 QemuOpts *opts; 1758 Error *local_err = NULL; 1759 const char *transport_name, *portal, *target, *filename; 1760 #if LIBISCSI_API_VERSION >= (20160603) 1761 enum iscsi_transport_type transport; 1762 #endif 1763 int i, ret = 0, timeout = 0, lun; 1764 1765 /* If we are given a filename, parse the filename, with precedence given to 1766 * filename encoded options */ 1767 filename = qdict_get_try_str(options, "filename"); 1768 if (filename) { 1769 warn_report("'filename' option specified. " 1770 "This is an unsupported option, and may be deprecated " 1771 "in the future"); 1772 iscsi_parse_filename(filename, options, &local_err); 1773 if (local_err) { 1774 ret = -EINVAL; 1775 error_propagate(errp, local_err); 1776 goto exit; 1777 } 1778 } 1779 1780 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1781 qemu_opts_absorb_qdict(opts, options, &local_err); 1782 if (local_err) { 1783 error_propagate(errp, local_err); 1784 ret = -EINVAL; 1785 goto out; 1786 } 1787 1788 transport_name = qemu_opt_get(opts, "transport"); 1789 portal = qemu_opt_get(opts, "portal"); 1790 target = qemu_opt_get(opts, "target"); 1791 lun = qemu_opt_get_number(opts, "lun", 0); 1792 1793 if (!transport_name || !portal || !target) { 1794 error_setg(errp, "Need all of transport, portal and target options"); 1795 ret = -EINVAL; 1796 goto out; 1797 } 1798 1799 if (!strcmp(transport_name, "tcp")) { 1800 #if LIBISCSI_API_VERSION >= (20160603) 1801 transport = TCP_TRANSPORT; 1802 } else if (!strcmp(transport_name, "iser")) { 1803 transport = ISER_TRANSPORT; 1804 #else 1805 /* TCP is what older libiscsi versions always use */ 1806 #endif 1807 } else { 1808 error_setg(errp, "Unknown transport: %s", transport_name); 1809 ret = -EINVAL; 1810 goto out; 1811 } 1812 1813 memset(iscsilun, 0, sizeof(IscsiLun)); 1814 1815 initiator_name = get_initiator_name(opts); 1816 1817 iscsi = iscsi_create_context(initiator_name); 1818 if (iscsi == NULL) { 1819 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1820 ret = -ENOMEM; 1821 goto out; 1822 } 1823 #if LIBISCSI_API_VERSION >= (20160603) 1824 if (iscsi_init_transport(iscsi, transport)) { 1825 error_setg(errp, ("Error initializing transport.")); 1826 ret = -EINVAL; 1827 goto out; 1828 } 1829 #endif 1830 if (iscsi_set_targetname(iscsi, target)) { 1831 error_setg(errp, "iSCSI: Failed to set target name."); 1832 ret = -EINVAL; 1833 goto out; 1834 } 1835 1836 /* check if we got CHAP username/password via the options */ 1837 apply_chap(iscsi, opts, &local_err); 1838 if (local_err != NULL) { 1839 error_propagate(errp, local_err); 1840 ret = -EINVAL; 1841 goto out; 1842 } 1843 1844 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1845 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1846 ret = -EINVAL; 1847 goto out; 1848 } 1849 1850 /* check if we got HEADER_DIGEST via the options */ 1851 apply_header_digest(iscsi, opts, &local_err); 1852 if (local_err != NULL) { 1853 error_propagate(errp, local_err); 1854 ret = -EINVAL; 1855 goto out; 1856 } 1857 1858 /* timeout handling is broken in libiscsi before 1.15.0 */ 1859 timeout = qemu_opt_get_number(opts, "timeout", 0); 1860 #if LIBISCSI_API_VERSION >= 20150621 1861 iscsi_set_timeout(iscsi, timeout); 1862 #else 1863 if (timeout) { 1864 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1865 } 1866 #endif 1867 1868 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1869 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1870 iscsi_get_error(iscsi)); 1871 ret = -EINVAL; 1872 goto out; 1873 } 1874 1875 iscsilun->iscsi = iscsi; 1876 iscsilun->aio_context = bdrv_get_aio_context(bs); 1877 iscsilun->lun = lun; 1878 iscsilun->has_write_same = true; 1879 1880 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1881 (void **) &inq, errp); 1882 if (task == NULL) { 1883 ret = -EINVAL; 1884 goto out; 1885 } 1886 iscsilun->type = inq->periperal_device_type; 1887 scsi_free_scsi_task(task); 1888 task = NULL; 1889 1890 iscsi_modesense_sync(iscsilun); 1891 if (iscsilun->dpofua) { 1892 bs->supported_write_flags = BDRV_REQ_FUA; 1893 } 1894 1895 /* Check the write protect flag of the LUN if we want to write */ 1896 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1897 iscsilun->write_protected) { 1898 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1899 ret = -EACCES; 1900 goto out; 1901 } 1902 1903 iscsi_readcapacity_sync(iscsilun, &local_err); 1904 if (local_err != NULL) { 1905 error_propagate(errp, local_err); 1906 ret = -EINVAL; 1907 goto out; 1908 } 1909 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1910 1911 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1912 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1913 * will try to read from the device to guess the image format. 1914 */ 1915 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1916 bs->sg = true; 1917 } 1918 1919 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1920 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1921 (void **) &inq_vpd, errp); 1922 if (task == NULL) { 1923 ret = -EINVAL; 1924 goto out; 1925 } 1926 for (i = 0; i < inq_vpd->num_pages; i++) { 1927 struct scsi_task *inq_task; 1928 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1929 struct scsi_inquiry_block_limits *inq_bl; 1930 struct scsi_inquiry_device_identification *inq_di; 1931 switch (inq_vpd->pages[i]) { 1932 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1933 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1934 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1935 (void **) &inq_lbp, errp); 1936 if (inq_task == NULL) { 1937 ret = -EINVAL; 1938 goto out; 1939 } 1940 memcpy(&iscsilun->lbp, inq_lbp, 1941 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1942 scsi_free_scsi_task(inq_task); 1943 break; 1944 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1945 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1946 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1947 (void **) &inq_bl, errp); 1948 if (inq_task == NULL) { 1949 ret = -EINVAL; 1950 goto out; 1951 } 1952 memcpy(&iscsilun->bl, inq_bl, 1953 sizeof(struct scsi_inquiry_block_limits)); 1954 scsi_free_scsi_task(inq_task); 1955 break; 1956 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1957 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1958 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1959 (void **) &inq_di, errp); 1960 if (inq_task == NULL) { 1961 ret = -EINVAL; 1962 goto out; 1963 } 1964 iscsi_save_designator(iscsilun, inq_di); 1965 scsi_free_scsi_task(inq_task); 1966 break; 1967 default: 1968 break; 1969 } 1970 } 1971 scsi_free_scsi_task(task); 1972 task = NULL; 1973 1974 qemu_mutex_init(&iscsilun->mutex); 1975 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1976 1977 /* Guess the internal cluster (page) size of the iscsi target by the means 1978 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1979 * reasonable size */ 1980 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1981 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1982 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 1983 iscsilun->block_size; 1984 if (iscsilun->lbprz) { 1985 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1986 } 1987 } 1988 1989 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 1990 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1991 } 1992 1993 out: 1994 qemu_opts_del(opts); 1995 g_free(initiator_name); 1996 if (task != NULL) { 1997 scsi_free_scsi_task(task); 1998 } 1999 2000 if (ret) { 2001 if (iscsi != NULL) { 2002 if (iscsi_is_logged_in(iscsi)) { 2003 iscsi_logout_sync(iscsi); 2004 } 2005 iscsi_destroy_context(iscsi); 2006 } 2007 memset(iscsilun, 0, sizeof(IscsiLun)); 2008 } 2009 exit: 2010 return ret; 2011 } 2012 2013 static void iscsi_close(BlockDriverState *bs) 2014 { 2015 IscsiLun *iscsilun = bs->opaque; 2016 struct iscsi_context *iscsi = iscsilun->iscsi; 2017 2018 iscsi_detach_aio_context(bs); 2019 if (iscsi_is_logged_in(iscsi)) { 2020 iscsi_logout_sync(iscsi); 2021 } 2022 iscsi_destroy_context(iscsi); 2023 if (iscsilun->dd) { 2024 g_free(iscsilun->dd->designator); 2025 g_free(iscsilun->dd); 2026 } 2027 g_free(iscsilun->zeroblock); 2028 iscsi_allocmap_free(iscsilun); 2029 qemu_mutex_destroy(&iscsilun->mutex); 2030 memset(iscsilun, 0, sizeof(IscsiLun)); 2031 } 2032 2033 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2034 { 2035 /* We don't actually refresh here, but just return data queried in 2036 * iscsi_open(): iscsi targets don't change their limits. */ 2037 2038 IscsiLun *iscsilun = bs->opaque; 2039 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2040 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2041 2042 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2043 2044 bs->bl.request_alignment = block_size; 2045 2046 if (iscsilun->bl.max_xfer_len) { 2047 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2048 } 2049 2050 if (max_xfer_len * block_size < INT_MAX) { 2051 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2052 } 2053 2054 if (iscsilun->lbp.lbpu) { 2055 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2056 bs->bl.max_pdiscard = 2057 iscsilun->bl.max_unmap * iscsilun->block_size; 2058 } 2059 bs->bl.pdiscard_alignment = 2060 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2061 } else { 2062 bs->bl.pdiscard_alignment = iscsilun->block_size; 2063 } 2064 2065 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2066 bs->bl.max_pwrite_zeroes = 2067 iscsilun->bl.max_ws_len * iscsilun->block_size; 2068 } 2069 if (iscsilun->lbp.lbpws) { 2070 bs->bl.pwrite_zeroes_alignment = 2071 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2072 } else { 2073 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2074 } 2075 if (iscsilun->bl.opt_xfer_len && 2076 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2077 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2078 iscsilun->block_size); 2079 } 2080 } 2081 2082 /* Note that this will not re-establish a connection with an iSCSI target - it 2083 * is effectively a NOP. */ 2084 static int iscsi_reopen_prepare(BDRVReopenState *state, 2085 BlockReopenQueue *queue, Error **errp) 2086 { 2087 IscsiLun *iscsilun = state->bs->opaque; 2088 2089 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2090 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2091 return -EACCES; 2092 } 2093 return 0; 2094 } 2095 2096 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2097 { 2098 IscsiLun *iscsilun = reopen_state->bs->opaque; 2099 2100 /* the cache.direct status might have changed */ 2101 if (iscsilun->allocmap != NULL) { 2102 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2103 } 2104 } 2105 2106 static int iscsi_truncate(BlockDriverState *bs, int64_t offset, 2107 PreallocMode prealloc, Error **errp) 2108 { 2109 IscsiLun *iscsilun = bs->opaque; 2110 Error *local_err = NULL; 2111 2112 if (prealloc != PREALLOC_MODE_OFF) { 2113 error_setg(errp, "Unsupported preallocation mode '%s'", 2114 PreallocMode_str(prealloc)); 2115 return -ENOTSUP; 2116 } 2117 2118 if (iscsilun->type != TYPE_DISK) { 2119 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2120 return -ENOTSUP; 2121 } 2122 2123 iscsi_readcapacity_sync(iscsilun, &local_err); 2124 if (local_err != NULL) { 2125 error_propagate(errp, local_err); 2126 return -EIO; 2127 } 2128 2129 if (offset > iscsi_getlength(bs)) { 2130 error_setg(errp, "Cannot grow iSCSI devices"); 2131 return -EINVAL; 2132 } 2133 2134 if (iscsilun->allocmap != NULL) { 2135 iscsi_allocmap_init(iscsilun, bs->open_flags); 2136 } 2137 2138 return 0; 2139 } 2140 2141 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2142 Error **errp) 2143 { 2144 int ret = 0; 2145 int64_t total_size = 0; 2146 BlockDriverState *bs; 2147 IscsiLun *iscsilun = NULL; 2148 QDict *bs_options; 2149 Error *local_err = NULL; 2150 2151 bs = bdrv_new(); 2152 2153 /* Read out options */ 2154 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2155 BDRV_SECTOR_SIZE); 2156 bs->opaque = g_new0(struct IscsiLun, 1); 2157 iscsilun = bs->opaque; 2158 2159 bs_options = qdict_new(); 2160 iscsi_parse_filename(filename, bs_options, &local_err); 2161 if (local_err) { 2162 error_propagate(errp, local_err); 2163 ret = -EINVAL; 2164 } else { 2165 ret = iscsi_open(bs, bs_options, 0, NULL); 2166 } 2167 qobject_unref(bs_options); 2168 2169 if (ret != 0) { 2170 goto out; 2171 } 2172 iscsi_detach_aio_context(bs); 2173 if (iscsilun->type != TYPE_DISK) { 2174 ret = -ENODEV; 2175 goto out; 2176 } 2177 if (bs->total_sectors < total_size) { 2178 ret = -ENOSPC; 2179 goto out; 2180 } 2181 2182 ret = 0; 2183 out: 2184 if (iscsilun->iscsi != NULL) { 2185 iscsi_destroy_context(iscsilun->iscsi); 2186 } 2187 g_free(bs->opaque); 2188 bs->opaque = NULL; 2189 bdrv_unref(bs); 2190 return ret; 2191 } 2192 2193 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2194 { 2195 IscsiLun *iscsilun = bs->opaque; 2196 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2197 bdi->cluster_size = iscsilun->cluster_size; 2198 return 0; 2199 } 2200 2201 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2202 Error **errp) 2203 { 2204 IscsiLun *iscsilun = bs->opaque; 2205 iscsi_allocmap_invalidate(iscsilun); 2206 } 2207 2208 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2209 BdrvChild *src, 2210 uint64_t src_offset, 2211 BdrvChild *dst, 2212 uint64_t dst_offset, 2213 uint64_t bytes, 2214 BdrvRequestFlags flags) 2215 { 2216 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, flags); 2217 } 2218 2219 static struct scsi_task *iscsi_xcopy_task(int param_len) 2220 { 2221 struct scsi_task *task; 2222 2223 task = g_new0(struct scsi_task, 1); 2224 2225 task->cdb[0] = EXTENDED_COPY; 2226 task->cdb[10] = (param_len >> 24) & 0xFF; 2227 task->cdb[11] = (param_len >> 16) & 0xFF; 2228 task->cdb[12] = (param_len >> 8) & 0xFF; 2229 task->cdb[13] = param_len & 0xFF; 2230 task->cdb_size = 16; 2231 task->xfer_dir = SCSI_XFER_WRITE; 2232 task->expxferlen = param_len; 2233 2234 return task; 2235 } 2236 2237 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2238 { 2239 struct scsi_inquiry_device_designator *dd = lun->dd; 2240 2241 memset(desc, 0, 32); 2242 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2243 desc[4] = dd->code_set; 2244 desc[5] = (dd->designator_type & 0xF) 2245 | ((dd->association & 3) << 4); 2246 desc[7] = dd->designator_length; 2247 memcpy(desc + 8, dd->designator, dd->designator_length); 2248 2249 desc[28] = 0; 2250 desc[29] = (lun->block_size >> 16) & 0xFF; 2251 desc[30] = (lun->block_size >> 8) & 0xFF; 2252 desc[31] = lun->block_size & 0xFF; 2253 } 2254 2255 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2256 int dst_index) 2257 { 2258 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2259 hdr[1] = ((dc << 1) | cat) & 0xFF; 2260 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2261 /* don't account for the first 4 bytes in descriptor header*/ 2262 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2263 hdr[4] = (src_index >> 8) & 0xFF; 2264 hdr[5] = src_index & 0xFF; 2265 hdr[6] = (dst_index >> 8) & 0xFF; 2266 hdr[7] = dst_index & 0xFF; 2267 } 2268 2269 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2270 int src_index, int dst_index, int num_blks, 2271 uint64_t src_lba, uint64_t dst_lba) 2272 { 2273 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2274 2275 /* The caller should verify the request size */ 2276 assert(num_blks < 65536); 2277 desc[10] = (num_blks >> 8) & 0xFF; 2278 desc[11] = num_blks & 0xFF; 2279 desc[12] = (src_lba >> 56) & 0xFF; 2280 desc[13] = (src_lba >> 48) & 0xFF; 2281 desc[14] = (src_lba >> 40) & 0xFF; 2282 desc[15] = (src_lba >> 32) & 0xFF; 2283 desc[16] = (src_lba >> 24) & 0xFF; 2284 desc[17] = (src_lba >> 16) & 0xFF; 2285 desc[18] = (src_lba >> 8) & 0xFF; 2286 desc[19] = src_lba & 0xFF; 2287 desc[20] = (dst_lba >> 56) & 0xFF; 2288 desc[21] = (dst_lba >> 48) & 0xFF; 2289 desc[22] = (dst_lba >> 40) & 0xFF; 2290 desc[23] = (dst_lba >> 32) & 0xFF; 2291 desc[24] = (dst_lba >> 24) & 0xFF; 2292 desc[25] = (dst_lba >> 16) & 0xFF; 2293 desc[26] = (dst_lba >> 8) & 0xFF; 2294 desc[27] = dst_lba & 0xFF; 2295 } 2296 2297 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2298 int list_id_usage, int prio, 2299 int tgt_desc_len, 2300 int seg_desc_len, int inline_data_len) 2301 { 2302 buf[0] = list_id; 2303 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2304 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2305 buf[3] = tgt_desc_len & 0xFF; 2306 buf[8] = (seg_desc_len >> 24) & 0xFF; 2307 buf[9] = (seg_desc_len >> 16) & 0xFF; 2308 buf[10] = (seg_desc_len >> 8) & 0xFF; 2309 buf[11] = seg_desc_len & 0xFF; 2310 buf[12] = (inline_data_len >> 24) & 0xFF; 2311 buf[13] = (inline_data_len >> 16) & 0xFF; 2312 buf[14] = (inline_data_len >> 8) & 0xFF; 2313 buf[15] = inline_data_len & 0xFF; 2314 } 2315 2316 static void iscsi_xcopy_data(struct iscsi_data *data, 2317 IscsiLun *src, int64_t src_lba, 2318 IscsiLun *dst, int64_t dst_lba, 2319 uint16_t num_blocks) 2320 { 2321 uint8_t *buf; 2322 const int src_offset = XCOPY_DESC_OFFSET; 2323 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2324 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2325 2326 data->size = XCOPY_DESC_OFFSET + 2327 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2328 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2329 data->data = g_malloc0(data->size); 2330 buf = data->data; 2331 2332 /* Initialise the parameter list header */ 2333 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2334 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2335 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2336 0); 2337 2338 /* Initialise CSCD list with one src + one dst descriptor */ 2339 iscsi_populate_target_desc(&buf[src_offset], src); 2340 iscsi_populate_target_desc(&buf[dst_offset], dst); 2341 2342 /* Initialise one segment descriptor */ 2343 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2344 src_lba, dst_lba); 2345 } 2346 2347 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2348 BdrvChild *src, 2349 uint64_t src_offset, 2350 BdrvChild *dst, 2351 uint64_t dst_offset, 2352 uint64_t bytes, 2353 BdrvRequestFlags flags) 2354 { 2355 IscsiLun *dst_lun = dst->bs->opaque; 2356 IscsiLun *src_lun; 2357 struct IscsiTask iscsi_task; 2358 struct iscsi_data data; 2359 int r = 0; 2360 int block_size; 2361 2362 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2363 return -ENOTSUP; 2364 } 2365 src_lun = src->bs->opaque; 2366 2367 if (!src_lun->dd || !dst_lun->dd) { 2368 return -ENOTSUP; 2369 } 2370 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2371 return -ENOTSUP; 2372 } 2373 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2374 return -ENOTSUP; 2375 } 2376 if (dst_lun->block_size != src_lun->block_size || 2377 !dst_lun->block_size) { 2378 return -ENOTSUP; 2379 } 2380 2381 block_size = dst_lun->block_size; 2382 if (bytes / block_size > 65535) { 2383 return -ENOTSUP; 2384 } 2385 2386 iscsi_xcopy_data(&data, 2387 src_lun, src_offset / block_size, 2388 dst_lun, dst_offset / block_size, 2389 bytes / block_size); 2390 2391 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2392 2393 qemu_mutex_lock(&dst_lun->mutex); 2394 iscsi_task.task = iscsi_xcopy_task(data.size); 2395 retry: 2396 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2397 iscsi_task.task, iscsi_co_generic_cb, 2398 &data, 2399 &iscsi_task) != 0) { 2400 r = -EIO; 2401 goto out_unlock; 2402 } 2403 2404 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2405 2406 if (iscsi_task.do_retry) { 2407 iscsi_task.complete = 0; 2408 goto retry; 2409 } 2410 2411 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2412 r = iscsi_task.err_code; 2413 goto out_unlock; 2414 } 2415 2416 out_unlock: 2417 g_free(iscsi_task.task); 2418 qemu_mutex_unlock(&dst_lun->mutex); 2419 g_free(iscsi_task.err_str); 2420 return r; 2421 } 2422 2423 static QemuOptsList iscsi_create_opts = { 2424 .name = "iscsi-create-opts", 2425 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2426 .desc = { 2427 { 2428 .name = BLOCK_OPT_SIZE, 2429 .type = QEMU_OPT_SIZE, 2430 .help = "Virtual disk size" 2431 }, 2432 { /* end of list */ } 2433 } 2434 }; 2435 2436 static BlockDriver bdrv_iscsi = { 2437 .format_name = "iscsi", 2438 .protocol_name = "iscsi", 2439 2440 .instance_size = sizeof(IscsiLun), 2441 .bdrv_parse_filename = iscsi_parse_filename, 2442 .bdrv_file_open = iscsi_open, 2443 .bdrv_close = iscsi_close, 2444 .bdrv_co_create_opts = iscsi_co_create_opts, 2445 .create_opts = &iscsi_create_opts, 2446 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2447 .bdrv_reopen_commit = iscsi_reopen_commit, 2448 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2449 2450 .bdrv_getlength = iscsi_getlength, 2451 .bdrv_get_info = iscsi_get_info, 2452 .bdrv_truncate = iscsi_truncate, 2453 .bdrv_refresh_limits = iscsi_refresh_limits, 2454 2455 .bdrv_co_block_status = iscsi_co_block_status, 2456 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2457 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2458 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2459 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2460 .bdrv_co_readv = iscsi_co_readv, 2461 .bdrv_co_writev = iscsi_co_writev, 2462 .bdrv_co_flush_to_disk = iscsi_co_flush, 2463 2464 #ifdef __linux__ 2465 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2466 #endif 2467 2468 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2469 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2470 }; 2471 2472 #if LIBISCSI_API_VERSION >= (20160603) 2473 static BlockDriver bdrv_iser = { 2474 .format_name = "iser", 2475 .protocol_name = "iser", 2476 2477 .instance_size = sizeof(IscsiLun), 2478 .bdrv_parse_filename = iscsi_parse_filename, 2479 .bdrv_file_open = iscsi_open, 2480 .bdrv_close = iscsi_close, 2481 .bdrv_co_create_opts = iscsi_co_create_opts, 2482 .create_opts = &iscsi_create_opts, 2483 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2484 .bdrv_reopen_commit = iscsi_reopen_commit, 2485 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2486 2487 .bdrv_getlength = iscsi_getlength, 2488 .bdrv_get_info = iscsi_get_info, 2489 .bdrv_truncate = iscsi_truncate, 2490 .bdrv_refresh_limits = iscsi_refresh_limits, 2491 2492 .bdrv_co_block_status = iscsi_co_block_status, 2493 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2494 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2495 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2496 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2497 .bdrv_co_readv = iscsi_co_readv, 2498 .bdrv_co_writev = iscsi_co_writev, 2499 .bdrv_co_flush_to_disk = iscsi_co_flush, 2500 2501 #ifdef __linux__ 2502 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2503 #endif 2504 2505 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2506 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2507 }; 2508 #endif 2509 2510 static void iscsi_block_init(void) 2511 { 2512 bdrv_register(&bdrv_iscsi); 2513 #if LIBISCSI_API_VERSION >= (20160603) 2514 bdrv_register(&bdrv_iser); 2515 #endif 2516 } 2517 2518 block_init(iscsi_block_init); 2519