1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2017 Peter Lieven <pl@kamp.de> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 28 #include <poll.h> 29 #include <math.h> 30 #include <arpa/inet.h> 31 #include "qemu-common.h" 32 #include "qemu/config-file.h" 33 #include "qemu/error-report.h" 34 #include "qemu/bitops.h" 35 #include "qemu/bitmap.h" 36 #include "block/block_int.h" 37 #include "block/qdict.h" 38 #include "scsi/constants.h" 39 #include "qemu/iov.h" 40 #include "qemu/module.h" 41 #include "qemu/option.h" 42 #include "qemu/uuid.h" 43 #include "sysemu/replay.h" 44 #include "qapi/error.h" 45 #include "qapi/qapi-commands-misc.h" 46 #include "qapi/qmp/qdict.h" 47 #include "qapi/qmp/qstring.h" 48 #include "crypto/secret.h" 49 #include "scsi/utils.h" 50 #include "trace.h" 51 52 /* Conflict between scsi/utils.h and libiscsi! :( */ 53 #define SCSI_XFER_NONE ISCSI_XFER_NONE 54 #include <iscsi/iscsi.h> 55 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */ 56 #include <iscsi/scsi-lowlevel.h> 57 #undef inline 58 #undef SCSI_XFER_NONE 59 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 60 61 #ifdef __linux__ 62 #include <scsi/sg.h> 63 #endif 64 65 typedef struct IscsiLun { 66 struct iscsi_context *iscsi; 67 AioContext *aio_context; 68 int lun; 69 enum scsi_inquiry_peripheral_device_type type; 70 int block_size; 71 uint64_t num_blocks; 72 int events; 73 QEMUTimer *nop_timer; 74 QEMUTimer *event_timer; 75 QemuMutex mutex; 76 struct scsi_inquiry_logical_block_provisioning lbp; 77 struct scsi_inquiry_block_limits bl; 78 struct scsi_inquiry_device_designator *dd; 79 unsigned char *zeroblock; 80 /* The allocmap tracks which clusters (pages) on the iSCSI target are 81 * allocated and which are not. In case a target returns zeros for 82 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 83 * of reading zeros over the wire if a read request falls within an 84 * unallocated block. As there are 3 possible states we need 2 bitmaps to 85 * track. allocmap_valid keeps track if QEMU's information about a page is 86 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 87 * valid information about a page the corresponding allocmap entry should be 88 * switched to unallocated as well to force a new lookup of the allocation 89 * status as lookups are generally skipped if a page is suspect to be 90 * allocated. If a iSCSI target is opened with cache.direct = on the 91 * allocmap_valid does not exist turning all cached information invalid so 92 * that a fresh lookup is made for any page even if allocmap entry returns 93 * it's unallocated. */ 94 unsigned long *allocmap; 95 unsigned long *allocmap_valid; 96 long allocmap_size; 97 int cluster_size; 98 bool use_16_for_rw; 99 bool write_protected; 100 bool lbpme; 101 bool lbprz; 102 bool dpofua; 103 bool has_write_same; 104 bool request_timed_out; 105 } IscsiLun; 106 107 typedef struct IscsiTask { 108 int status; 109 int complete; 110 int retries; 111 int do_retry; 112 struct scsi_task *task; 113 Coroutine *co; 114 IscsiLun *iscsilun; 115 QEMUTimer retry_timer; 116 int err_code; 117 char *err_str; 118 } IscsiTask; 119 120 typedef struct IscsiAIOCB { 121 BlockAIOCB common; 122 QEMUBH *bh; 123 IscsiLun *iscsilun; 124 struct scsi_task *task; 125 int status; 126 int64_t sector_num; 127 int nb_sectors; 128 int ret; 129 #ifdef __linux__ 130 sg_io_hdr_t *ioh; 131 #endif 132 bool cancelled; 133 } IscsiAIOCB; 134 135 /* libiscsi uses time_t so its enough to process events every second */ 136 #define EVENT_INTERVAL 1000 137 #define NOP_INTERVAL 5000 138 #define MAX_NOP_FAILURES 3 139 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 140 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 141 142 /* this threshold is a trade-off knob to choose between 143 * the potential additional overhead of an extra GET_LBA_STATUS request 144 * vs. unnecessarily reading a lot of zero sectors over the wire. 145 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 146 * sectors we check the allocation status of the area covered by the 147 * request first if the allocationmap indicates that the area might be 148 * unallocated. */ 149 #define ISCSI_CHECKALLOC_THRES 64 150 151 #ifdef __linux__ 152 153 static void 154 iscsi_bh_cb(void *p) 155 { 156 IscsiAIOCB *acb = p; 157 158 qemu_bh_delete(acb->bh); 159 160 acb->common.cb(acb->common.opaque, acb->status); 161 162 if (acb->task != NULL) { 163 scsi_free_scsi_task(acb->task); 164 acb->task = NULL; 165 } 166 167 qemu_aio_unref(acb); 168 } 169 170 static void 171 iscsi_schedule_bh(IscsiAIOCB *acb) 172 { 173 if (acb->bh) { 174 return; 175 } 176 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 177 qemu_bh_schedule(acb->bh); 178 } 179 180 #endif 181 182 static void iscsi_co_generic_bh_cb(void *opaque) 183 { 184 struct IscsiTask *iTask = opaque; 185 186 iTask->complete = 1; 187 aio_co_wake(iTask->co); 188 } 189 190 static void iscsi_retry_timer_expired(void *opaque) 191 { 192 struct IscsiTask *iTask = opaque; 193 iTask->complete = 1; 194 if (iTask->co) { 195 aio_co_wake(iTask->co); 196 } 197 } 198 199 static inline unsigned exp_random(double mean) 200 { 201 return -mean * log((double)rand() / RAND_MAX); 202 } 203 204 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 205 * libiscsi 1.10.0, together with other constants we need. Use it as 206 * a hint that we have to define them ourselves if needed, to keep the 207 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 208 * the test because SCSI_STATUS_* is an enum. 209 * 210 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 211 * an enum, check against the LIBISCSI_API_VERSION macro, which was 212 * introduced in 1.11.0. If it is present, there is no need to define 213 * anything. 214 */ 215 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 216 !defined(LIBISCSI_API_VERSION) 217 #define SCSI_STATUS_TASK_SET_FULL 0x28 218 #define SCSI_STATUS_TIMEOUT 0x0f000002 219 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 220 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 221 #endif 222 223 #ifndef LIBISCSI_API_VERSION 224 #define LIBISCSI_API_VERSION 20130701 225 #endif 226 227 static int iscsi_translate_sense(struct scsi_sense *sense) 228 { 229 return scsi_sense_to_errno(sense->key, 230 (sense->ascq & 0xFF00) >> 8, 231 sense->ascq & 0xFF); 232 } 233 234 /* Called (via iscsi_service) with QemuMutex held. */ 235 static void 236 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 237 void *command_data, void *opaque) 238 { 239 struct IscsiTask *iTask = opaque; 240 struct scsi_task *task = command_data; 241 242 iTask->status = status; 243 iTask->do_retry = 0; 244 iTask->task = task; 245 246 if (status != SCSI_STATUS_GOOD) { 247 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 248 if (status == SCSI_STATUS_BUSY || 249 status == SCSI_STATUS_TIMEOUT || 250 status == SCSI_STATUS_TASK_SET_FULL) { 251 unsigned retry_time = 252 exp_random(iscsi_retry_times[iTask->retries - 1]); 253 if (status == SCSI_STATUS_TIMEOUT) { 254 /* make sure the request is rescheduled AFTER the 255 * reconnect is initiated */ 256 retry_time = EVENT_INTERVAL * 2; 257 iTask->iscsilun->request_timed_out = true; 258 } 259 error_report("iSCSI Busy/TaskSetFull/TimeOut" 260 " (retry #%u in %u ms): %s", 261 iTask->retries, retry_time, 262 iscsi_get_error(iscsi)); 263 aio_timer_init(iTask->iscsilun->aio_context, 264 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 265 SCALE_MS, iscsi_retry_timer_expired, iTask); 266 timer_mod(&iTask->retry_timer, 267 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 268 iTask->do_retry = 1; 269 } 270 } else if (status == SCSI_STATUS_CHECK_CONDITION) { 271 int error = iscsi_translate_sense(&task->sense); 272 if (error == EAGAIN) { 273 error_report("iSCSI CheckCondition: %s", 274 iscsi_get_error(iscsi)); 275 iTask->do_retry = 1; 276 } else { 277 iTask->err_code = -error; 278 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 279 } 280 } 281 } 282 283 if (iTask->co) { 284 replay_bh_schedule_oneshot_event(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, max_bytes; 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 max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size; 725 726 qemu_mutex_lock(&iscsilun->mutex); 727 retry: 728 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 729 lba, 8 + 16, iscsi_co_generic_cb, 730 &iTask) == NULL) { 731 ret = -ENOMEM; 732 goto out_unlock; 733 } 734 iscsi_co_wait_for_task(&iTask, iscsilun); 735 736 if (iTask.do_retry) { 737 if (iTask.task != NULL) { 738 scsi_free_scsi_task(iTask.task); 739 iTask.task = NULL; 740 } 741 iTask.complete = 0; 742 goto retry; 743 } 744 745 if (iTask.status != SCSI_STATUS_GOOD) { 746 /* in case the get_lba_status_callout fails (i.e. 747 * because the device is busy or the cmd is not 748 * supported) we pretend all blocks are allocated 749 * for backwards compatibility */ 750 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 751 lba, iTask.err_str); 752 goto out_unlock; 753 } 754 755 lbas = scsi_datain_unmarshall(iTask.task); 756 if (lbas == NULL || lbas->num_descriptors == 0) { 757 ret = -EIO; 758 goto out_unlock; 759 } 760 761 lbasd = &lbas->descriptors[0]; 762 763 if (lba != lbasd->lba) { 764 ret = -EIO; 765 goto out_unlock; 766 } 767 768 *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes); 769 770 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 771 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 772 ret &= ~BDRV_BLOCK_DATA; 773 if (iscsilun->lbprz) { 774 ret |= BDRV_BLOCK_ZERO; 775 } 776 } 777 778 if (ret & BDRV_BLOCK_ZERO) { 779 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 780 } else { 781 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 782 } 783 784 if (*pnum > bytes) { 785 *pnum = bytes; 786 } 787 out_unlock: 788 qemu_mutex_unlock(&iscsilun->mutex); 789 g_free(iTask.err_str); 790 out: 791 if (iTask.task != NULL) { 792 scsi_free_scsi_task(iTask.task); 793 } 794 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 795 *file = bs; 796 } 797 return ret; 798 } 799 800 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 801 int64_t sector_num, int nb_sectors, 802 QEMUIOVector *iov) 803 { 804 IscsiLun *iscsilun = bs->opaque; 805 struct IscsiTask iTask; 806 uint64_t lba; 807 uint32_t num_sectors; 808 int r = 0; 809 810 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 811 return -EINVAL; 812 } 813 814 if (bs->bl.max_transfer) { 815 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 816 } 817 818 /* if cache.direct is off and we have a valid entry in our allocation map 819 * we can skip checking the block status and directly return zeroes if 820 * the request falls within an unallocated area */ 821 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 822 nb_sectors * BDRV_SECTOR_SIZE) && 823 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 824 nb_sectors * BDRV_SECTOR_SIZE)) { 825 qemu_iovec_memset(iov, 0, 0x00, iov->size); 826 return 0; 827 } 828 829 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 830 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 831 nb_sectors * BDRV_SECTOR_SIZE) && 832 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 833 nb_sectors * BDRV_SECTOR_SIZE)) { 834 int64_t pnum; 835 /* check the block status from the beginning of the cluster 836 * containing the start sector */ 837 int64_t head; 838 int ret; 839 840 assert(iscsilun->cluster_size); 841 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 842 ret = iscsi_co_block_status(bs, true, 843 sector_num * BDRV_SECTOR_SIZE - head, 844 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 845 if (ret < 0) { 846 return ret; 847 } 848 /* if the whole request falls into an unallocated area we can avoid 849 * reading and directly return zeroes instead */ 850 if (ret & BDRV_BLOCK_ZERO && 851 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 852 qemu_iovec_memset(iov, 0, 0x00, iov->size); 853 return 0; 854 } 855 } 856 857 lba = sector_qemu2lun(sector_num, iscsilun); 858 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 859 860 iscsi_co_init_iscsitask(iscsilun, &iTask); 861 qemu_mutex_lock(&iscsilun->mutex); 862 retry: 863 if (iscsilun->use_16_for_rw) { 864 #if LIBISCSI_API_VERSION >= (20160603) 865 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 866 num_sectors * iscsilun->block_size, 867 iscsilun->block_size, 0, 0, 0, 0, 0, 868 iscsi_co_generic_cb, &iTask, 869 (struct scsi_iovec *)iov->iov, iov->niov); 870 } else { 871 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 872 num_sectors * iscsilun->block_size, 873 iscsilun->block_size, 874 0, 0, 0, 0, 0, 875 iscsi_co_generic_cb, &iTask, 876 (struct scsi_iovec *)iov->iov, iov->niov); 877 } 878 #else 879 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 880 num_sectors * iscsilun->block_size, 881 iscsilun->block_size, 0, 0, 0, 0, 0, 882 iscsi_co_generic_cb, &iTask); 883 } else { 884 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 885 num_sectors * iscsilun->block_size, 886 iscsilun->block_size, 887 0, 0, 0, 0, 0, 888 iscsi_co_generic_cb, &iTask); 889 } 890 #endif 891 if (iTask.task == NULL) { 892 qemu_mutex_unlock(&iscsilun->mutex); 893 return -ENOMEM; 894 } 895 #if LIBISCSI_API_VERSION < (20160603) 896 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 897 #endif 898 899 iscsi_co_wait_for_task(&iTask, iscsilun); 900 if (iTask.task != NULL) { 901 scsi_free_scsi_task(iTask.task); 902 iTask.task = NULL; 903 } 904 905 if (iTask.do_retry) { 906 iTask.complete = 0; 907 goto retry; 908 } 909 910 if (iTask.status != SCSI_STATUS_GOOD) { 911 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 912 lba, iTask.err_str); 913 r = iTask.err_code; 914 } 915 916 qemu_mutex_unlock(&iscsilun->mutex); 917 g_free(iTask.err_str); 918 return r; 919 } 920 921 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 922 { 923 IscsiLun *iscsilun = bs->opaque; 924 struct IscsiTask iTask; 925 int r = 0; 926 927 iscsi_co_init_iscsitask(iscsilun, &iTask); 928 qemu_mutex_lock(&iscsilun->mutex); 929 retry: 930 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 931 0, iscsi_co_generic_cb, &iTask) == NULL) { 932 qemu_mutex_unlock(&iscsilun->mutex); 933 return -ENOMEM; 934 } 935 936 iscsi_co_wait_for_task(&iTask, iscsilun); 937 938 if (iTask.task != NULL) { 939 scsi_free_scsi_task(iTask.task); 940 iTask.task = NULL; 941 } 942 943 if (iTask.do_retry) { 944 iTask.complete = 0; 945 goto retry; 946 } 947 948 if (iTask.status != SCSI_STATUS_GOOD) { 949 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 950 r = iTask.err_code; 951 } 952 953 qemu_mutex_unlock(&iscsilun->mutex); 954 g_free(iTask.err_str); 955 return r; 956 } 957 958 #ifdef __linux__ 959 /* Called (via iscsi_service) with QemuMutex held. */ 960 static void 961 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 962 void *command_data, void *opaque) 963 { 964 IscsiAIOCB *acb = opaque; 965 966 if (status == SCSI_STATUS_CANCELLED) { 967 if (!acb->bh) { 968 acb->status = -ECANCELED; 969 iscsi_schedule_bh(acb); 970 } 971 return; 972 } 973 974 acb->status = 0; 975 if (status < 0) { 976 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 977 iscsi_get_error(iscsi)); 978 acb->status = -iscsi_translate_sense(&acb->task->sense); 979 } 980 981 acb->ioh->driver_status = 0; 982 acb->ioh->host_status = 0; 983 acb->ioh->resid = 0; 984 acb->ioh->status = status; 985 986 #define SG_ERR_DRIVER_SENSE 0x08 987 988 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 989 int ss; 990 991 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 992 993 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 994 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 995 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 996 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 997 } 998 999 iscsi_schedule_bh(acb); 1000 } 1001 1002 static void iscsi_ioctl_bh_completion(void *opaque) 1003 { 1004 IscsiAIOCB *acb = opaque; 1005 1006 qemu_bh_delete(acb->bh); 1007 acb->common.cb(acb->common.opaque, acb->ret); 1008 qemu_aio_unref(acb); 1009 } 1010 1011 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 1012 { 1013 BlockDriverState *bs = acb->common.bs; 1014 IscsiLun *iscsilun = bs->opaque; 1015 int ret = 0; 1016 1017 switch (req) { 1018 case SG_GET_VERSION_NUM: 1019 *(int *)buf = 30000; 1020 break; 1021 case SG_GET_SCSI_ID: 1022 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 1023 break; 1024 default: 1025 ret = -EINVAL; 1026 } 1027 assert(!acb->bh); 1028 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 1029 iscsi_ioctl_bh_completion, acb); 1030 acb->ret = ret; 1031 qemu_bh_schedule(acb->bh); 1032 } 1033 1034 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1035 unsigned long int req, void *buf, 1036 BlockCompletionFunc *cb, void *opaque) 1037 { 1038 IscsiLun *iscsilun = bs->opaque; 1039 struct iscsi_context *iscsi = iscsilun->iscsi; 1040 struct iscsi_data data; 1041 IscsiAIOCB *acb; 1042 1043 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1044 1045 acb->iscsilun = iscsilun; 1046 acb->bh = NULL; 1047 acb->status = -EINPROGRESS; 1048 acb->ioh = buf; 1049 acb->cancelled = false; 1050 1051 if (req != SG_IO) { 1052 iscsi_ioctl_handle_emulated(acb, req, buf); 1053 return &acb->common; 1054 } 1055 1056 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1057 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1058 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1059 qemu_aio_unref(acb); 1060 return NULL; 1061 } 1062 1063 acb->task = malloc(sizeof(struct scsi_task)); 1064 if (acb->task == NULL) { 1065 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1066 iscsi_get_error(iscsi)); 1067 qemu_aio_unref(acb); 1068 return NULL; 1069 } 1070 memset(acb->task, 0, sizeof(struct scsi_task)); 1071 1072 switch (acb->ioh->dxfer_direction) { 1073 case SG_DXFER_TO_DEV: 1074 acb->task->xfer_dir = SCSI_XFER_WRITE; 1075 break; 1076 case SG_DXFER_FROM_DEV: 1077 acb->task->xfer_dir = SCSI_XFER_READ; 1078 break; 1079 default: 1080 acb->task->xfer_dir = SCSI_XFER_NONE; 1081 break; 1082 } 1083 1084 acb->task->cdb_size = acb->ioh->cmd_len; 1085 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1086 acb->task->expxferlen = acb->ioh->dxfer_len; 1087 1088 data.size = 0; 1089 qemu_mutex_lock(&iscsilun->mutex); 1090 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1091 if (acb->ioh->iovec_count == 0) { 1092 data.data = acb->ioh->dxferp; 1093 data.size = acb->ioh->dxfer_len; 1094 } else { 1095 scsi_task_set_iov_out(acb->task, 1096 (struct scsi_iovec *) acb->ioh->dxferp, 1097 acb->ioh->iovec_count); 1098 } 1099 } 1100 1101 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1102 iscsi_aio_ioctl_cb, 1103 (data.size > 0) ? &data : NULL, 1104 acb) != 0) { 1105 qemu_mutex_unlock(&iscsilun->mutex); 1106 scsi_free_scsi_task(acb->task); 1107 qemu_aio_unref(acb); 1108 return NULL; 1109 } 1110 1111 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1112 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1113 if (acb->ioh->iovec_count == 0) { 1114 scsi_task_add_data_in_buffer(acb->task, 1115 acb->ioh->dxfer_len, 1116 acb->ioh->dxferp); 1117 } else { 1118 scsi_task_set_iov_in(acb->task, 1119 (struct scsi_iovec *) acb->ioh->dxferp, 1120 acb->ioh->iovec_count); 1121 } 1122 } 1123 1124 iscsi_set_events(iscsilun); 1125 qemu_mutex_unlock(&iscsilun->mutex); 1126 1127 return &acb->common; 1128 } 1129 1130 #endif 1131 1132 static int64_t 1133 iscsi_getlength(BlockDriverState *bs) 1134 { 1135 IscsiLun *iscsilun = bs->opaque; 1136 int64_t len; 1137 1138 len = iscsilun->num_blocks; 1139 len *= iscsilun->block_size; 1140 1141 return len; 1142 } 1143 1144 static int 1145 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1146 { 1147 IscsiLun *iscsilun = bs->opaque; 1148 struct IscsiTask iTask; 1149 struct unmap_list list; 1150 int r = 0; 1151 1152 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1153 return -ENOTSUP; 1154 } 1155 1156 if (!iscsilun->lbp.lbpu) { 1157 /* UNMAP is not supported by the target */ 1158 return 0; 1159 } 1160 1161 list.lba = offset / iscsilun->block_size; 1162 list.num = bytes / iscsilun->block_size; 1163 1164 iscsi_co_init_iscsitask(iscsilun, &iTask); 1165 qemu_mutex_lock(&iscsilun->mutex); 1166 retry: 1167 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1168 iscsi_co_generic_cb, &iTask) == NULL) { 1169 r = -ENOMEM; 1170 goto out_unlock; 1171 } 1172 1173 iscsi_co_wait_for_task(&iTask, iscsilun); 1174 1175 if (iTask.task != NULL) { 1176 scsi_free_scsi_task(iTask.task); 1177 iTask.task = NULL; 1178 } 1179 1180 if (iTask.do_retry) { 1181 iTask.complete = 0; 1182 goto retry; 1183 } 1184 1185 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1186 1187 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1188 /* the target might fail with a check condition if it 1189 is not happy with the alignment of the UNMAP request 1190 we silently fail in this case */ 1191 goto out_unlock; 1192 } 1193 1194 if (iTask.status != SCSI_STATUS_GOOD) { 1195 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1196 list.lba, iTask.err_str); 1197 r = iTask.err_code; 1198 goto out_unlock; 1199 } 1200 1201 out_unlock: 1202 qemu_mutex_unlock(&iscsilun->mutex); 1203 g_free(iTask.err_str); 1204 return r; 1205 } 1206 1207 static int 1208 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1209 int bytes, BdrvRequestFlags flags) 1210 { 1211 IscsiLun *iscsilun = bs->opaque; 1212 struct IscsiTask iTask; 1213 uint64_t lba; 1214 uint32_t nb_blocks; 1215 bool use_16_for_ws = iscsilun->use_16_for_rw; 1216 int r = 0; 1217 1218 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1219 return -ENOTSUP; 1220 } 1221 1222 if (flags & BDRV_REQ_MAY_UNMAP) { 1223 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1224 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1225 use_16_for_ws = true; 1226 } 1227 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1228 /* WRITESAME16 with UNMAP is not supported by the target, 1229 * fall back and try WRITESAME10/16 without UNMAP */ 1230 flags &= ~BDRV_REQ_MAY_UNMAP; 1231 use_16_for_ws = iscsilun->use_16_for_rw; 1232 } 1233 } 1234 1235 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1236 /* WRITESAME without UNMAP is not supported by the target */ 1237 return -ENOTSUP; 1238 } 1239 1240 lba = offset / iscsilun->block_size; 1241 nb_blocks = bytes / iscsilun->block_size; 1242 1243 if (iscsilun->zeroblock == NULL) { 1244 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1245 if (iscsilun->zeroblock == NULL) { 1246 return -ENOMEM; 1247 } 1248 } 1249 1250 qemu_mutex_lock(&iscsilun->mutex); 1251 iscsi_co_init_iscsitask(iscsilun, &iTask); 1252 retry: 1253 if (use_16_for_ws) { 1254 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1255 iscsilun->zeroblock, iscsilun->block_size, 1256 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1257 0, 0, iscsi_co_generic_cb, &iTask); 1258 } else { 1259 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1260 iscsilun->zeroblock, iscsilun->block_size, 1261 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1262 0, 0, iscsi_co_generic_cb, &iTask); 1263 } 1264 if (iTask.task == NULL) { 1265 qemu_mutex_unlock(&iscsilun->mutex); 1266 return -ENOMEM; 1267 } 1268 1269 iscsi_co_wait_for_task(&iTask, iscsilun); 1270 1271 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1272 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1273 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1274 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1275 /* WRITE SAME is not supported by the target */ 1276 iscsilun->has_write_same = false; 1277 scsi_free_scsi_task(iTask.task); 1278 r = -ENOTSUP; 1279 goto out_unlock; 1280 } 1281 1282 if (iTask.task != NULL) { 1283 scsi_free_scsi_task(iTask.task); 1284 iTask.task = NULL; 1285 } 1286 1287 if (iTask.do_retry) { 1288 iTask.complete = 0; 1289 goto retry; 1290 } 1291 1292 if (iTask.status != SCSI_STATUS_GOOD) { 1293 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1294 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1295 lba, iTask.err_str); 1296 r = iTask.err_code; 1297 goto out_unlock; 1298 } 1299 1300 if (flags & BDRV_REQ_MAY_UNMAP) { 1301 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1302 } else { 1303 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1304 } 1305 1306 out_unlock: 1307 qemu_mutex_unlock(&iscsilun->mutex); 1308 g_free(iTask.err_str); 1309 return r; 1310 } 1311 1312 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1313 Error **errp) 1314 { 1315 const char *user = NULL; 1316 const char *password = NULL; 1317 const char *secretid; 1318 char *secret = NULL; 1319 1320 user = qemu_opt_get(opts, "user"); 1321 if (!user) { 1322 return; 1323 } 1324 1325 secretid = qemu_opt_get(opts, "password-secret"); 1326 password = qemu_opt_get(opts, "password"); 1327 if (secretid && password) { 1328 error_setg(errp, "'password' and 'password-secret' properties are " 1329 "mutually exclusive"); 1330 return; 1331 } 1332 if (secretid) { 1333 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1334 if (!secret) { 1335 return; 1336 } 1337 password = secret; 1338 } else if (!password) { 1339 error_setg(errp, "CHAP username specified but no password was given"); 1340 return; 1341 } 1342 1343 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1344 error_setg(errp, "Failed to set initiator username and password"); 1345 } 1346 1347 g_free(secret); 1348 } 1349 1350 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1351 Error **errp) 1352 { 1353 const char *digest = NULL; 1354 1355 digest = qemu_opt_get(opts, "header-digest"); 1356 if (!digest) { 1357 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1358 } else if (!strcmp(digest, "crc32c")) { 1359 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1360 } else if (!strcmp(digest, "none")) { 1361 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1362 } else if (!strcmp(digest, "crc32c-none")) { 1363 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1364 } else if (!strcmp(digest, "none-crc32c")) { 1365 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1366 } else { 1367 error_setg(errp, "Invalid header-digest setting : %s", digest); 1368 } 1369 } 1370 1371 static char *get_initiator_name(QemuOpts *opts) 1372 { 1373 const char *name; 1374 char *iscsi_name; 1375 UuidInfo *uuid_info; 1376 1377 name = qemu_opt_get(opts, "initiator-name"); 1378 if (name) { 1379 return g_strdup(name); 1380 } 1381 1382 uuid_info = qmp_query_uuid(NULL); 1383 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1384 name = qemu_get_vm_name(); 1385 } else { 1386 name = uuid_info->UUID; 1387 } 1388 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1389 name ? ":" : "", name ? name : ""); 1390 qapi_free_UuidInfo(uuid_info); 1391 return iscsi_name; 1392 } 1393 1394 static void iscsi_nop_timed_event(void *opaque) 1395 { 1396 IscsiLun *iscsilun = opaque; 1397 1398 qemu_mutex_lock(&iscsilun->mutex); 1399 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1400 error_report("iSCSI: NOP timeout. Reconnecting..."); 1401 iscsilun->request_timed_out = true; 1402 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1403 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1404 goto out; 1405 } 1406 1407 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1408 iscsi_set_events(iscsilun); 1409 1410 out: 1411 qemu_mutex_unlock(&iscsilun->mutex); 1412 } 1413 1414 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1415 { 1416 struct scsi_task *task = NULL; 1417 struct scsi_readcapacity10 *rc10 = NULL; 1418 struct scsi_readcapacity16 *rc16 = NULL; 1419 int retries = ISCSI_CMD_RETRIES; 1420 1421 do { 1422 if (task != NULL) { 1423 scsi_free_scsi_task(task); 1424 task = NULL; 1425 } 1426 1427 switch (iscsilun->type) { 1428 case TYPE_DISK: 1429 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1430 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1431 rc16 = scsi_datain_unmarshall(task); 1432 if (rc16 == NULL) { 1433 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1434 } else { 1435 iscsilun->block_size = rc16->block_length; 1436 iscsilun->num_blocks = rc16->returned_lba + 1; 1437 iscsilun->lbpme = !!rc16->lbpme; 1438 iscsilun->lbprz = !!rc16->lbprz; 1439 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1440 } 1441 break; 1442 } 1443 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1444 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1445 break; 1446 } 1447 /* Fall through and try READ CAPACITY(10) instead. */ 1448 case TYPE_ROM: 1449 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1450 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1451 rc10 = scsi_datain_unmarshall(task); 1452 if (rc10 == NULL) { 1453 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1454 } else { 1455 iscsilun->block_size = rc10->block_size; 1456 if (rc10->lba == 0) { 1457 /* blank disk loaded */ 1458 iscsilun->num_blocks = 0; 1459 } else { 1460 iscsilun->num_blocks = rc10->lba + 1; 1461 } 1462 } 1463 } 1464 break; 1465 default: 1466 return; 1467 } 1468 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1469 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1470 && retries-- > 0); 1471 1472 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1473 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1474 } else if (!iscsilun->block_size || 1475 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1476 error_setg(errp, "iSCSI: the target returned an invalid " 1477 "block size of %d.", iscsilun->block_size); 1478 } 1479 if (task) { 1480 scsi_free_scsi_task(task); 1481 } 1482 } 1483 1484 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1485 int evpd, int pc, void **inq, Error **errp) 1486 { 1487 int full_size; 1488 struct scsi_task *task = NULL; 1489 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1490 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1491 goto fail; 1492 } 1493 full_size = scsi_datain_getfullsize(task); 1494 if (full_size > task->datain.size) { 1495 scsi_free_scsi_task(task); 1496 1497 /* we need more data for the full list */ 1498 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1499 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1500 goto fail; 1501 } 1502 } 1503 1504 *inq = scsi_datain_unmarshall(task); 1505 if (*inq == NULL) { 1506 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1507 goto fail_with_err; 1508 } 1509 1510 return task; 1511 1512 fail: 1513 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1514 iscsi_get_error(iscsi)); 1515 fail_with_err: 1516 if (task != NULL) { 1517 scsi_free_scsi_task(task); 1518 } 1519 return NULL; 1520 } 1521 1522 static void iscsi_detach_aio_context(BlockDriverState *bs) 1523 { 1524 IscsiLun *iscsilun = bs->opaque; 1525 1526 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1527 false, NULL, NULL, NULL, NULL); 1528 iscsilun->events = 0; 1529 1530 if (iscsilun->nop_timer) { 1531 timer_del(iscsilun->nop_timer); 1532 timer_free(iscsilun->nop_timer); 1533 iscsilun->nop_timer = NULL; 1534 } 1535 if (iscsilun->event_timer) { 1536 timer_del(iscsilun->event_timer); 1537 timer_free(iscsilun->event_timer); 1538 iscsilun->event_timer = NULL; 1539 } 1540 } 1541 1542 static void iscsi_attach_aio_context(BlockDriverState *bs, 1543 AioContext *new_context) 1544 { 1545 IscsiLun *iscsilun = bs->opaque; 1546 1547 iscsilun->aio_context = new_context; 1548 iscsi_set_events(iscsilun); 1549 1550 /* Set up a timer for sending out iSCSI NOPs */ 1551 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1552 QEMU_CLOCK_REALTIME, SCALE_MS, 1553 iscsi_nop_timed_event, iscsilun); 1554 timer_mod(iscsilun->nop_timer, 1555 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1556 1557 /* Set up a timer for periodic calls to iscsi_set_events and to 1558 * scan for command timeout */ 1559 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1560 QEMU_CLOCK_REALTIME, SCALE_MS, 1561 iscsi_timed_check_events, iscsilun); 1562 timer_mod(iscsilun->event_timer, 1563 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1564 } 1565 1566 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1567 { 1568 struct scsi_task *task; 1569 struct scsi_mode_sense *ms = NULL; 1570 iscsilun->write_protected = false; 1571 iscsilun->dpofua = false; 1572 1573 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1574 1, SCSI_MODESENSE_PC_CURRENT, 1575 0x3F, 0, 255); 1576 if (task == NULL) { 1577 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1578 iscsi_get_error(iscsilun->iscsi)); 1579 goto out; 1580 } 1581 1582 if (task->status != SCSI_STATUS_GOOD) { 1583 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1584 goto out; 1585 } 1586 ms = scsi_datain_unmarshall(task); 1587 if (!ms) { 1588 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1589 iscsi_get_error(iscsilun->iscsi)); 1590 goto out; 1591 } 1592 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1593 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1594 1595 out: 1596 if (task) { 1597 scsi_free_scsi_task(task); 1598 } 1599 } 1600 1601 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1602 { 1603 QemuOptsList *list; 1604 QemuOpts *opts; 1605 const char *user, *password, *password_secret, *initiator_name, 1606 *header_digest, *timeout; 1607 1608 list = qemu_find_opts("iscsi"); 1609 if (!list) { 1610 return; 1611 } 1612 1613 opts = qemu_opts_find(list, target); 1614 if (opts == NULL) { 1615 opts = QTAILQ_FIRST(&list->head); 1616 if (!opts) { 1617 return; 1618 } 1619 } 1620 1621 user = qemu_opt_get(opts, "user"); 1622 if (user) { 1623 qdict_set_default_str(options, "user", user); 1624 } 1625 1626 password = qemu_opt_get(opts, "password"); 1627 if (password) { 1628 qdict_set_default_str(options, "password", password); 1629 } 1630 1631 password_secret = qemu_opt_get(opts, "password-secret"); 1632 if (password_secret) { 1633 qdict_set_default_str(options, "password-secret", password_secret); 1634 } 1635 1636 initiator_name = qemu_opt_get(opts, "initiator-name"); 1637 if (initiator_name) { 1638 qdict_set_default_str(options, "initiator-name", initiator_name); 1639 } 1640 1641 header_digest = qemu_opt_get(opts, "header-digest"); 1642 if (header_digest) { 1643 /* -iscsi takes upper case values, but QAPI only supports lower case 1644 * enum constant names, so we have to convert here. */ 1645 char *qapi_value = g_ascii_strdown(header_digest, -1); 1646 qdict_set_default_str(options, "header-digest", qapi_value); 1647 g_free(qapi_value); 1648 } 1649 1650 timeout = qemu_opt_get(opts, "timeout"); 1651 if (timeout) { 1652 qdict_set_default_str(options, "timeout", timeout); 1653 } 1654 } 1655 1656 /* 1657 * We support iscsi url's on the form 1658 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1659 */ 1660 static void iscsi_parse_filename(const char *filename, QDict *options, 1661 Error **errp) 1662 { 1663 struct iscsi_url *iscsi_url; 1664 const char *transport_name; 1665 char *lun_str; 1666 1667 iscsi_url = iscsi_parse_full_url(NULL, filename); 1668 if (iscsi_url == NULL) { 1669 error_setg(errp, "Failed to parse URL : %s", filename); 1670 return; 1671 } 1672 1673 #if LIBISCSI_API_VERSION >= (20160603) 1674 switch (iscsi_url->transport) { 1675 case TCP_TRANSPORT: 1676 transport_name = "tcp"; 1677 break; 1678 case ISER_TRANSPORT: 1679 transport_name = "iser"; 1680 break; 1681 default: 1682 error_setg(errp, "Unknown transport type (%d)", 1683 iscsi_url->transport); 1684 return; 1685 } 1686 #else 1687 transport_name = "tcp"; 1688 #endif 1689 1690 qdict_set_default_str(options, "transport", transport_name); 1691 qdict_set_default_str(options, "portal", iscsi_url->portal); 1692 qdict_set_default_str(options, "target", iscsi_url->target); 1693 1694 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1695 qdict_set_default_str(options, "lun", lun_str); 1696 g_free(lun_str); 1697 1698 /* User/password from -iscsi take precedence over those from the URL */ 1699 iscsi_parse_iscsi_option(iscsi_url->target, options); 1700 1701 if (iscsi_url->user[0] != '\0') { 1702 qdict_set_default_str(options, "user", iscsi_url->user); 1703 qdict_set_default_str(options, "password", iscsi_url->passwd); 1704 } 1705 1706 iscsi_destroy_url(iscsi_url); 1707 } 1708 1709 static QemuOptsList runtime_opts = { 1710 .name = "iscsi", 1711 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1712 .desc = { 1713 { 1714 .name = "transport", 1715 .type = QEMU_OPT_STRING, 1716 }, 1717 { 1718 .name = "portal", 1719 .type = QEMU_OPT_STRING, 1720 }, 1721 { 1722 .name = "target", 1723 .type = QEMU_OPT_STRING, 1724 }, 1725 { 1726 .name = "user", 1727 .type = QEMU_OPT_STRING, 1728 }, 1729 { 1730 .name = "password", 1731 .type = QEMU_OPT_STRING, 1732 }, 1733 { 1734 .name = "password-secret", 1735 .type = QEMU_OPT_STRING, 1736 }, 1737 { 1738 .name = "lun", 1739 .type = QEMU_OPT_NUMBER, 1740 }, 1741 { 1742 .name = "initiator-name", 1743 .type = QEMU_OPT_STRING, 1744 }, 1745 { 1746 .name = "header-digest", 1747 .type = QEMU_OPT_STRING, 1748 }, 1749 { 1750 .name = "timeout", 1751 .type = QEMU_OPT_NUMBER, 1752 }, 1753 { /* end of list */ } 1754 }, 1755 }; 1756 1757 static void iscsi_save_designator(IscsiLun *lun, 1758 struct scsi_inquiry_device_identification *inq_di) 1759 { 1760 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1761 1762 for (desig = inq_di->designators; desig; desig = desig->next) { 1763 if (desig->association || 1764 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1765 continue; 1766 } 1767 /* NAA works better than T10 vendor ID based designator. */ 1768 if (!copy || copy->designator_type < desig->designator_type) { 1769 copy = desig; 1770 } 1771 } 1772 if (copy) { 1773 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1774 *lun->dd = *copy; 1775 lun->dd->next = NULL; 1776 lun->dd->designator = g_malloc(copy->designator_length); 1777 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1778 } 1779 } 1780 1781 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1782 Error **errp) 1783 { 1784 IscsiLun *iscsilun = bs->opaque; 1785 struct iscsi_context *iscsi = NULL; 1786 struct scsi_task *task = NULL; 1787 struct scsi_inquiry_standard *inq = NULL; 1788 struct scsi_inquiry_supported_pages *inq_vpd; 1789 char *initiator_name = NULL; 1790 QemuOpts *opts; 1791 Error *local_err = NULL; 1792 const char *transport_name, *portal, *target; 1793 #if LIBISCSI_API_VERSION >= (20160603) 1794 enum iscsi_transport_type transport; 1795 #endif 1796 int i, ret = 0, timeout = 0, lun; 1797 1798 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1799 qemu_opts_absorb_qdict(opts, options, &local_err); 1800 if (local_err) { 1801 error_propagate(errp, local_err); 1802 ret = -EINVAL; 1803 goto out; 1804 } 1805 1806 transport_name = qemu_opt_get(opts, "transport"); 1807 portal = qemu_opt_get(opts, "portal"); 1808 target = qemu_opt_get(opts, "target"); 1809 lun = qemu_opt_get_number(opts, "lun", 0); 1810 1811 if (!transport_name || !portal || !target) { 1812 error_setg(errp, "Need all of transport, portal and target options"); 1813 ret = -EINVAL; 1814 goto out; 1815 } 1816 1817 if (!strcmp(transport_name, "tcp")) { 1818 #if LIBISCSI_API_VERSION >= (20160603) 1819 transport = TCP_TRANSPORT; 1820 } else if (!strcmp(transport_name, "iser")) { 1821 transport = ISER_TRANSPORT; 1822 #else 1823 /* TCP is what older libiscsi versions always use */ 1824 #endif 1825 } else { 1826 error_setg(errp, "Unknown transport: %s", transport_name); 1827 ret = -EINVAL; 1828 goto out; 1829 } 1830 1831 memset(iscsilun, 0, sizeof(IscsiLun)); 1832 1833 initiator_name = get_initiator_name(opts); 1834 1835 iscsi = iscsi_create_context(initiator_name); 1836 if (iscsi == NULL) { 1837 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1838 ret = -ENOMEM; 1839 goto out; 1840 } 1841 #if LIBISCSI_API_VERSION >= (20160603) 1842 if (iscsi_init_transport(iscsi, transport)) { 1843 error_setg(errp, ("Error initializing transport.")); 1844 ret = -EINVAL; 1845 goto out; 1846 } 1847 #endif 1848 if (iscsi_set_targetname(iscsi, target)) { 1849 error_setg(errp, "iSCSI: Failed to set target name."); 1850 ret = -EINVAL; 1851 goto out; 1852 } 1853 1854 /* check if we got CHAP username/password via the options */ 1855 apply_chap(iscsi, opts, &local_err); 1856 if (local_err != NULL) { 1857 error_propagate(errp, local_err); 1858 ret = -EINVAL; 1859 goto out; 1860 } 1861 1862 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1863 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1864 ret = -EINVAL; 1865 goto out; 1866 } 1867 1868 /* check if we got HEADER_DIGEST via the options */ 1869 apply_header_digest(iscsi, opts, &local_err); 1870 if (local_err != NULL) { 1871 error_propagate(errp, local_err); 1872 ret = -EINVAL; 1873 goto out; 1874 } 1875 1876 /* timeout handling is broken in libiscsi before 1.15.0 */ 1877 timeout = qemu_opt_get_number(opts, "timeout", 0); 1878 #if LIBISCSI_API_VERSION >= 20150621 1879 iscsi_set_timeout(iscsi, timeout); 1880 #else 1881 if (timeout) { 1882 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1883 } 1884 #endif 1885 1886 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1887 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1888 iscsi_get_error(iscsi)); 1889 ret = -EINVAL; 1890 goto out; 1891 } 1892 1893 iscsilun->iscsi = iscsi; 1894 iscsilun->aio_context = bdrv_get_aio_context(bs); 1895 iscsilun->lun = lun; 1896 iscsilun->has_write_same = true; 1897 1898 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1899 (void **) &inq, errp); 1900 if (task == NULL) { 1901 ret = -EINVAL; 1902 goto out; 1903 } 1904 iscsilun->type = inq->periperal_device_type; 1905 scsi_free_scsi_task(task); 1906 task = NULL; 1907 1908 iscsi_modesense_sync(iscsilun); 1909 if (iscsilun->dpofua) { 1910 bs->supported_write_flags = BDRV_REQ_FUA; 1911 } 1912 1913 /* Check the write protect flag of the LUN if we want to write */ 1914 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1915 iscsilun->write_protected) { 1916 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1917 if (ret < 0) { 1918 goto out; 1919 } 1920 flags &= ~BDRV_O_RDWR; 1921 } 1922 1923 iscsi_readcapacity_sync(iscsilun, &local_err); 1924 if (local_err != NULL) { 1925 error_propagate(errp, local_err); 1926 ret = -EINVAL; 1927 goto out; 1928 } 1929 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1930 1931 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1932 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1933 * will try to read from the device to guess the image format. 1934 */ 1935 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1936 bs->sg = true; 1937 } 1938 1939 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1940 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1941 (void **) &inq_vpd, errp); 1942 if (task == NULL) { 1943 ret = -EINVAL; 1944 goto out; 1945 } 1946 for (i = 0; i < inq_vpd->num_pages; i++) { 1947 struct scsi_task *inq_task; 1948 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1949 struct scsi_inquiry_block_limits *inq_bl; 1950 struct scsi_inquiry_device_identification *inq_di; 1951 switch (inq_vpd->pages[i]) { 1952 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1953 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1954 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1955 (void **) &inq_lbp, errp); 1956 if (inq_task == NULL) { 1957 ret = -EINVAL; 1958 goto out; 1959 } 1960 memcpy(&iscsilun->lbp, inq_lbp, 1961 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1962 scsi_free_scsi_task(inq_task); 1963 break; 1964 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1965 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1966 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1967 (void **) &inq_bl, errp); 1968 if (inq_task == NULL) { 1969 ret = -EINVAL; 1970 goto out; 1971 } 1972 memcpy(&iscsilun->bl, inq_bl, 1973 sizeof(struct scsi_inquiry_block_limits)); 1974 scsi_free_scsi_task(inq_task); 1975 break; 1976 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1977 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1978 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1979 (void **) &inq_di, errp); 1980 if (inq_task == NULL) { 1981 ret = -EINVAL; 1982 goto out; 1983 } 1984 iscsi_save_designator(iscsilun, inq_di); 1985 scsi_free_scsi_task(inq_task); 1986 break; 1987 default: 1988 break; 1989 } 1990 } 1991 scsi_free_scsi_task(task); 1992 task = NULL; 1993 1994 qemu_mutex_init(&iscsilun->mutex); 1995 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1996 1997 /* Guess the internal cluster (page) size of the iscsi target by the means 1998 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1999 * reasonable size */ 2000 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 2001 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 2002 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 2003 iscsilun->block_size; 2004 if (iscsilun->lbprz) { 2005 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 2006 } 2007 } 2008 2009 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2010 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2011 } 2012 2013 out: 2014 qemu_opts_del(opts); 2015 g_free(initiator_name); 2016 if (task != NULL) { 2017 scsi_free_scsi_task(task); 2018 } 2019 2020 if (ret) { 2021 if (iscsi != NULL) { 2022 if (iscsi_is_logged_in(iscsi)) { 2023 iscsi_logout_sync(iscsi); 2024 } 2025 iscsi_destroy_context(iscsi); 2026 } 2027 memset(iscsilun, 0, sizeof(IscsiLun)); 2028 } 2029 2030 return ret; 2031 } 2032 2033 static void iscsi_close(BlockDriverState *bs) 2034 { 2035 IscsiLun *iscsilun = bs->opaque; 2036 struct iscsi_context *iscsi = iscsilun->iscsi; 2037 2038 iscsi_detach_aio_context(bs); 2039 if (iscsi_is_logged_in(iscsi)) { 2040 iscsi_logout_sync(iscsi); 2041 } 2042 iscsi_destroy_context(iscsi); 2043 if (iscsilun->dd) { 2044 g_free(iscsilun->dd->designator); 2045 g_free(iscsilun->dd); 2046 } 2047 g_free(iscsilun->zeroblock); 2048 iscsi_allocmap_free(iscsilun); 2049 qemu_mutex_destroy(&iscsilun->mutex); 2050 memset(iscsilun, 0, sizeof(IscsiLun)); 2051 } 2052 2053 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2054 { 2055 /* We don't actually refresh here, but just return data queried in 2056 * iscsi_open(): iscsi targets don't change their limits. */ 2057 2058 IscsiLun *iscsilun = bs->opaque; 2059 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2060 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2061 2062 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2063 2064 bs->bl.request_alignment = block_size; 2065 2066 if (iscsilun->bl.max_xfer_len) { 2067 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2068 } 2069 2070 if (max_xfer_len * block_size < INT_MAX) { 2071 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2072 } 2073 2074 if (iscsilun->lbp.lbpu) { 2075 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2076 bs->bl.max_pdiscard = 2077 iscsilun->bl.max_unmap * iscsilun->block_size; 2078 } 2079 bs->bl.pdiscard_alignment = 2080 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2081 } else { 2082 bs->bl.pdiscard_alignment = iscsilun->block_size; 2083 } 2084 2085 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2086 bs->bl.max_pwrite_zeroes = 2087 iscsilun->bl.max_ws_len * iscsilun->block_size; 2088 } 2089 if (iscsilun->lbp.lbpws) { 2090 bs->bl.pwrite_zeroes_alignment = 2091 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2092 } else { 2093 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2094 } 2095 if (iscsilun->bl.opt_xfer_len && 2096 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2097 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2098 iscsilun->block_size); 2099 } 2100 } 2101 2102 /* Note that this will not re-establish a connection with an iSCSI target - it 2103 * is effectively a NOP. */ 2104 static int iscsi_reopen_prepare(BDRVReopenState *state, 2105 BlockReopenQueue *queue, Error **errp) 2106 { 2107 IscsiLun *iscsilun = state->bs->opaque; 2108 2109 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2110 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2111 return -EACCES; 2112 } 2113 return 0; 2114 } 2115 2116 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2117 { 2118 IscsiLun *iscsilun = reopen_state->bs->opaque; 2119 2120 /* the cache.direct status might have changed */ 2121 if (iscsilun->allocmap != NULL) { 2122 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2123 } 2124 } 2125 2126 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2127 bool exact, PreallocMode prealloc, 2128 Error **errp) 2129 { 2130 IscsiLun *iscsilun = bs->opaque; 2131 int64_t cur_length; 2132 Error *local_err = NULL; 2133 2134 if (prealloc != PREALLOC_MODE_OFF) { 2135 error_setg(errp, "Unsupported preallocation mode '%s'", 2136 PreallocMode_str(prealloc)); 2137 return -ENOTSUP; 2138 } 2139 2140 if (iscsilun->type != TYPE_DISK) { 2141 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2142 return -ENOTSUP; 2143 } 2144 2145 iscsi_readcapacity_sync(iscsilun, &local_err); 2146 if (local_err != NULL) { 2147 error_propagate(errp, local_err); 2148 return -EIO; 2149 } 2150 2151 cur_length = iscsi_getlength(bs); 2152 if (offset != cur_length && exact) { 2153 error_setg(errp, "Cannot resize iSCSI devices"); 2154 return -ENOTSUP; 2155 } else if (offset > cur_length) { 2156 error_setg(errp, "Cannot grow iSCSI devices"); 2157 return -EINVAL; 2158 } 2159 2160 if (iscsilun->allocmap != NULL) { 2161 iscsi_allocmap_init(iscsilun, bs->open_flags); 2162 } 2163 2164 return 0; 2165 } 2166 2167 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2168 { 2169 IscsiLun *iscsilun = bs->opaque; 2170 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2171 bdi->cluster_size = iscsilun->cluster_size; 2172 return 0; 2173 } 2174 2175 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2176 Error **errp) 2177 { 2178 IscsiLun *iscsilun = bs->opaque; 2179 iscsi_allocmap_invalidate(iscsilun); 2180 } 2181 2182 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2183 BdrvChild *src, 2184 uint64_t src_offset, 2185 BdrvChild *dst, 2186 uint64_t dst_offset, 2187 uint64_t bytes, 2188 BdrvRequestFlags read_flags, 2189 BdrvRequestFlags write_flags) 2190 { 2191 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2192 read_flags, write_flags); 2193 } 2194 2195 static struct scsi_task *iscsi_xcopy_task(int param_len) 2196 { 2197 struct scsi_task *task; 2198 2199 task = g_new0(struct scsi_task, 1); 2200 2201 task->cdb[0] = EXTENDED_COPY; 2202 task->cdb[10] = (param_len >> 24) & 0xFF; 2203 task->cdb[11] = (param_len >> 16) & 0xFF; 2204 task->cdb[12] = (param_len >> 8) & 0xFF; 2205 task->cdb[13] = param_len & 0xFF; 2206 task->cdb_size = 16; 2207 task->xfer_dir = SCSI_XFER_WRITE; 2208 task->expxferlen = param_len; 2209 2210 return task; 2211 } 2212 2213 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2214 { 2215 struct scsi_inquiry_device_designator *dd = lun->dd; 2216 2217 memset(desc, 0, 32); 2218 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2219 desc[4] = dd->code_set; 2220 desc[5] = (dd->designator_type & 0xF) 2221 | ((dd->association & 3) << 4); 2222 desc[7] = dd->designator_length; 2223 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2224 2225 desc[28] = 0; 2226 desc[29] = (lun->block_size >> 16) & 0xFF; 2227 desc[30] = (lun->block_size >> 8) & 0xFF; 2228 desc[31] = lun->block_size & 0xFF; 2229 } 2230 2231 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2232 int dst_index) 2233 { 2234 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2235 hdr[1] = ((dc << 1) | cat) & 0xFF; 2236 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2237 /* don't account for the first 4 bytes in descriptor header*/ 2238 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2239 hdr[4] = (src_index >> 8) & 0xFF; 2240 hdr[5] = src_index & 0xFF; 2241 hdr[6] = (dst_index >> 8) & 0xFF; 2242 hdr[7] = dst_index & 0xFF; 2243 } 2244 2245 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2246 int src_index, int dst_index, int num_blks, 2247 uint64_t src_lba, uint64_t dst_lba) 2248 { 2249 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2250 2251 /* The caller should verify the request size */ 2252 assert(num_blks < 65536); 2253 desc[10] = (num_blks >> 8) & 0xFF; 2254 desc[11] = num_blks & 0xFF; 2255 desc[12] = (src_lba >> 56) & 0xFF; 2256 desc[13] = (src_lba >> 48) & 0xFF; 2257 desc[14] = (src_lba >> 40) & 0xFF; 2258 desc[15] = (src_lba >> 32) & 0xFF; 2259 desc[16] = (src_lba >> 24) & 0xFF; 2260 desc[17] = (src_lba >> 16) & 0xFF; 2261 desc[18] = (src_lba >> 8) & 0xFF; 2262 desc[19] = src_lba & 0xFF; 2263 desc[20] = (dst_lba >> 56) & 0xFF; 2264 desc[21] = (dst_lba >> 48) & 0xFF; 2265 desc[22] = (dst_lba >> 40) & 0xFF; 2266 desc[23] = (dst_lba >> 32) & 0xFF; 2267 desc[24] = (dst_lba >> 24) & 0xFF; 2268 desc[25] = (dst_lba >> 16) & 0xFF; 2269 desc[26] = (dst_lba >> 8) & 0xFF; 2270 desc[27] = dst_lba & 0xFF; 2271 } 2272 2273 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2274 int list_id_usage, int prio, 2275 int tgt_desc_len, 2276 int seg_desc_len, int inline_data_len) 2277 { 2278 buf[0] = list_id; 2279 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2280 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2281 buf[3] = tgt_desc_len & 0xFF; 2282 buf[8] = (seg_desc_len >> 24) & 0xFF; 2283 buf[9] = (seg_desc_len >> 16) & 0xFF; 2284 buf[10] = (seg_desc_len >> 8) & 0xFF; 2285 buf[11] = seg_desc_len & 0xFF; 2286 buf[12] = (inline_data_len >> 24) & 0xFF; 2287 buf[13] = (inline_data_len >> 16) & 0xFF; 2288 buf[14] = (inline_data_len >> 8) & 0xFF; 2289 buf[15] = inline_data_len & 0xFF; 2290 } 2291 2292 static void iscsi_xcopy_data(struct iscsi_data *data, 2293 IscsiLun *src, int64_t src_lba, 2294 IscsiLun *dst, int64_t dst_lba, 2295 uint16_t num_blocks) 2296 { 2297 uint8_t *buf; 2298 const int src_offset = XCOPY_DESC_OFFSET; 2299 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2300 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2301 2302 data->size = XCOPY_DESC_OFFSET + 2303 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2304 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2305 data->data = g_malloc0(data->size); 2306 buf = data->data; 2307 2308 /* Initialise the parameter list header */ 2309 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2310 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2311 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2312 0); 2313 2314 /* Initialise CSCD list with one src + one dst descriptor */ 2315 iscsi_populate_target_desc(&buf[src_offset], src); 2316 iscsi_populate_target_desc(&buf[dst_offset], dst); 2317 2318 /* Initialise one segment descriptor */ 2319 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2320 src_lba, dst_lba); 2321 } 2322 2323 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2324 BdrvChild *src, 2325 uint64_t src_offset, 2326 BdrvChild *dst, 2327 uint64_t dst_offset, 2328 uint64_t bytes, 2329 BdrvRequestFlags read_flags, 2330 BdrvRequestFlags write_flags) 2331 { 2332 IscsiLun *dst_lun = dst->bs->opaque; 2333 IscsiLun *src_lun; 2334 struct IscsiTask iscsi_task; 2335 struct iscsi_data data; 2336 int r = 0; 2337 int block_size; 2338 2339 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2340 return -ENOTSUP; 2341 } 2342 src_lun = src->bs->opaque; 2343 2344 if (!src_lun->dd || !dst_lun->dd) { 2345 return -ENOTSUP; 2346 } 2347 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2348 return -ENOTSUP; 2349 } 2350 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2351 return -ENOTSUP; 2352 } 2353 if (dst_lun->block_size != src_lun->block_size || 2354 !dst_lun->block_size) { 2355 return -ENOTSUP; 2356 } 2357 2358 block_size = dst_lun->block_size; 2359 if (bytes / block_size > 65535) { 2360 return -ENOTSUP; 2361 } 2362 2363 iscsi_xcopy_data(&data, 2364 src_lun, src_offset / block_size, 2365 dst_lun, dst_offset / block_size, 2366 bytes / block_size); 2367 2368 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2369 2370 qemu_mutex_lock(&dst_lun->mutex); 2371 iscsi_task.task = iscsi_xcopy_task(data.size); 2372 retry: 2373 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2374 iscsi_task.task, iscsi_co_generic_cb, 2375 &data, 2376 &iscsi_task) != 0) { 2377 r = -EIO; 2378 goto out_unlock; 2379 } 2380 2381 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2382 2383 if (iscsi_task.do_retry) { 2384 iscsi_task.complete = 0; 2385 goto retry; 2386 } 2387 2388 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2389 r = iscsi_task.err_code; 2390 goto out_unlock; 2391 } 2392 2393 out_unlock: 2394 2395 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2396 g_free(iscsi_task.task); 2397 qemu_mutex_unlock(&dst_lun->mutex); 2398 g_free(iscsi_task.err_str); 2399 return r; 2400 } 2401 2402 static QemuOptsList iscsi_create_opts = { 2403 .name = "iscsi-create-opts", 2404 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2405 .desc = { 2406 { 2407 .name = BLOCK_OPT_SIZE, 2408 .type = QEMU_OPT_SIZE, 2409 .help = "Virtual disk size" 2410 }, 2411 { /* end of list */ } 2412 } 2413 }; 2414 2415 static const char *const iscsi_strong_runtime_opts[] = { 2416 "transport", 2417 "portal", 2418 "target", 2419 "user", 2420 "password", 2421 "password-secret", 2422 "lun", 2423 "initiator-name", 2424 "header-digest", 2425 2426 NULL 2427 }; 2428 2429 static BlockDriver bdrv_iscsi = { 2430 .format_name = "iscsi", 2431 .protocol_name = "iscsi", 2432 2433 .instance_size = sizeof(IscsiLun), 2434 .bdrv_parse_filename = iscsi_parse_filename, 2435 .bdrv_file_open = iscsi_open, 2436 .bdrv_close = iscsi_close, 2437 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2438 .bdrv_reopen_commit = iscsi_reopen_commit, 2439 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2440 2441 .bdrv_getlength = iscsi_getlength, 2442 .bdrv_get_info = iscsi_get_info, 2443 .bdrv_co_truncate = iscsi_co_truncate, 2444 .bdrv_refresh_limits = iscsi_refresh_limits, 2445 2446 .bdrv_co_block_status = iscsi_co_block_status, 2447 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2448 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2449 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2450 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2451 .bdrv_co_readv = iscsi_co_readv, 2452 .bdrv_co_writev = iscsi_co_writev, 2453 .bdrv_co_flush_to_disk = iscsi_co_flush, 2454 2455 #ifdef __linux__ 2456 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2457 #endif 2458 2459 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2460 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2461 2462 .strong_runtime_opts = iscsi_strong_runtime_opts, 2463 }; 2464 2465 #if LIBISCSI_API_VERSION >= (20160603) 2466 static BlockDriver bdrv_iser = { 2467 .format_name = "iser", 2468 .protocol_name = "iser", 2469 2470 .instance_size = sizeof(IscsiLun), 2471 .bdrv_parse_filename = iscsi_parse_filename, 2472 .bdrv_file_open = iscsi_open, 2473 .bdrv_close = iscsi_close, 2474 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2475 .bdrv_reopen_commit = iscsi_reopen_commit, 2476 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2477 2478 .bdrv_getlength = iscsi_getlength, 2479 .bdrv_get_info = iscsi_get_info, 2480 .bdrv_co_truncate = iscsi_co_truncate, 2481 .bdrv_refresh_limits = iscsi_refresh_limits, 2482 2483 .bdrv_co_block_status = iscsi_co_block_status, 2484 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2485 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2486 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2487 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2488 .bdrv_co_readv = iscsi_co_readv, 2489 .bdrv_co_writev = iscsi_co_writev, 2490 .bdrv_co_flush_to_disk = iscsi_co_flush, 2491 2492 #ifdef __linux__ 2493 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2494 #endif 2495 2496 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2497 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2498 2499 .strong_runtime_opts = iscsi_strong_runtime_opts, 2500 }; 2501 #endif 2502 2503 static void iscsi_block_init(void) 2504 { 2505 bdrv_register(&bdrv_iscsi); 2506 #if LIBISCSI_API_VERSION >= (20160603) 2507 bdrv_register(&bdrv_iser); 2508 #endif 2509 } 2510 2511 block_init(iscsi_block_init); 2512