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 "sysemu/sysemu.h" 32 #include "qemu/config-file.h" 33 #include "qemu/error-report.h" 34 #include "qemu/bitops.h" 35 #include "qemu/bitmap.h" 36 #include "block/block_int.h" 37 #include "block/qdict.h" 38 #include "scsi/constants.h" 39 #include "qemu/iov.h" 40 #include "qemu/module.h" 41 #include "qemu/option.h" 42 #include "qemu/uuid.h" 43 #include "sysemu/replay.h" 44 #include "qapi/error.h" 45 #include "qapi/qapi-commands-machine.h" 46 #include "qapi/qmp/qdict.h" 47 #include "qapi/qmp/qstring.h" 48 #include "crypto/secret.h" 49 #include "scsi/utils.h" 50 #include "trace.h" 51 52 /* Conflict between scsi/utils.h and libiscsi! :( */ 53 #define SCSI_XFER_NONE ISCSI_XFER_NONE 54 #include <iscsi/iscsi.h> 55 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */ 56 #include <iscsi/scsi-lowlevel.h> 57 #undef inline 58 #undef SCSI_XFER_NONE 59 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 60 61 #ifdef __linux__ 62 #include <scsi/sg.h> 63 #endif 64 65 typedef struct IscsiLun { 66 struct iscsi_context *iscsi; 67 AioContext *aio_context; 68 int lun; 69 enum scsi_inquiry_peripheral_device_type type; 70 int block_size; 71 uint64_t num_blocks; 72 int events; 73 QEMUTimer *nop_timer; 74 QEMUTimer *event_timer; 75 QemuMutex mutex; 76 struct scsi_inquiry_logical_block_provisioning lbp; 77 struct scsi_inquiry_block_limits bl; 78 struct scsi_inquiry_device_designator *dd; 79 unsigned char *zeroblock; 80 /* The allocmap tracks which clusters (pages) on the iSCSI target are 81 * allocated and which are not. In case a target returns zeros for 82 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 83 * of reading zeros over the wire if a read request falls within an 84 * unallocated block. As there are 3 possible states we need 2 bitmaps to 85 * track. allocmap_valid keeps track if QEMU's information about a page is 86 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 87 * valid information about a page the corresponding allocmap entry should be 88 * switched to unallocated as well to force a new lookup of the allocation 89 * status as lookups are generally skipped if a page is suspect to be 90 * allocated. If a iSCSI target is opened with cache.direct = on the 91 * allocmap_valid does not exist turning all cached information invalid so 92 * that a fresh lookup is made for any page even if allocmap entry returns 93 * it's unallocated. */ 94 unsigned long *allocmap; 95 unsigned long *allocmap_valid; 96 long allocmap_size; 97 int cluster_size; 98 bool use_16_for_rw; 99 bool write_protected; 100 bool lbpme; 101 bool lbprz; 102 bool dpofua; 103 bool has_write_same; 104 bool request_timed_out; 105 } IscsiLun; 106 107 typedef struct IscsiTask { 108 int status; 109 int complete; 110 int retries; 111 int do_retry; 112 struct scsi_task *task; 113 Coroutine *co; 114 IscsiLun *iscsilun; 115 QEMUTimer retry_timer; 116 int err_code; 117 char *err_str; 118 } IscsiTask; 119 120 typedef struct IscsiAIOCB { 121 BlockAIOCB common; 122 QEMUBH *bh; 123 IscsiLun *iscsilun; 124 struct scsi_task *task; 125 int status; 126 int64_t sector_num; 127 int nb_sectors; 128 int ret; 129 #ifdef __linux__ 130 sg_io_hdr_t *ioh; 131 #endif 132 bool cancelled; 133 } IscsiAIOCB; 134 135 /* libiscsi uses time_t so its enough to process events every second */ 136 #define EVENT_INTERVAL 1000 137 #define NOP_INTERVAL 5000 138 #define MAX_NOP_FAILURES 3 139 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 140 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 141 142 /* this threshold is a trade-off knob to choose between 143 * the potential additional overhead of an extra GET_LBA_STATUS request 144 * vs. unnecessarily reading a lot of zero sectors over the wire. 145 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 146 * sectors we check the allocation status of the area covered by the 147 * request first if the allocationmap indicates that the area might be 148 * unallocated. */ 149 #define ISCSI_CHECKALLOC_THRES 64 150 151 #ifdef __linux__ 152 153 static void 154 iscsi_bh_cb(void *p) 155 { 156 IscsiAIOCB *acb = p; 157 158 qemu_bh_delete(acb->bh); 159 160 acb->common.cb(acb->common.opaque, acb->status); 161 162 if (acb->task != NULL) { 163 scsi_free_scsi_task(acb->task); 164 acb->task = NULL; 165 } 166 167 qemu_aio_unref(acb); 168 } 169 170 static void 171 iscsi_schedule_bh(IscsiAIOCB *acb) 172 { 173 if (acb->bh) { 174 return; 175 } 176 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 177 qemu_bh_schedule(acb->bh); 178 } 179 180 #endif 181 182 static void iscsi_co_generic_bh_cb(void *opaque) 183 { 184 struct IscsiTask *iTask = opaque; 185 186 iTask->complete = 1; 187 aio_co_wake(iTask->co); 188 } 189 190 static void iscsi_retry_timer_expired(void *opaque) 191 { 192 struct IscsiTask *iTask = opaque; 193 iTask->complete = 1; 194 if (iTask->co) { 195 aio_co_wake(iTask->co); 196 } 197 } 198 199 static inline unsigned exp_random(double mean) 200 { 201 return -mean * log((double)rand() / RAND_MAX); 202 } 203 204 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 205 * libiscsi 1.10.0, together with other constants we need. Use it as 206 * a hint that we have to define them ourselves if needed, to keep the 207 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 208 * the test because SCSI_STATUS_* is an enum. 209 * 210 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 211 * an enum, check against the LIBISCSI_API_VERSION macro, which was 212 * introduced in 1.11.0. If it is present, there is no need to define 213 * anything. 214 */ 215 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 216 !defined(LIBISCSI_API_VERSION) 217 #define SCSI_STATUS_TASK_SET_FULL 0x28 218 #define SCSI_STATUS_TIMEOUT 0x0f000002 219 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 220 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 221 #endif 222 223 #ifndef LIBISCSI_API_VERSION 224 #define LIBISCSI_API_VERSION 20130701 225 #endif 226 227 static int iscsi_translate_sense(struct scsi_sense *sense) 228 { 229 return scsi_sense_to_errno(sense->key, 230 (sense->ascq & 0xFF00) >> 8, 231 sense->ascq & 0xFF); 232 } 233 234 /* Called (via iscsi_service) with QemuMutex held. */ 235 static void 236 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 237 void *command_data, void *opaque) 238 { 239 struct IscsiTask *iTask = opaque; 240 struct scsi_task *task = command_data; 241 242 iTask->status = status; 243 iTask->do_retry = 0; 244 iTask->err_code = 0; 245 iTask->task = task; 246 247 if (status != SCSI_STATUS_GOOD) { 248 iTask->err_code = -EIO; 249 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 250 if (status == SCSI_STATUS_BUSY || 251 status == SCSI_STATUS_TIMEOUT || 252 status == SCSI_STATUS_TASK_SET_FULL) { 253 unsigned retry_time = 254 exp_random(iscsi_retry_times[iTask->retries - 1]); 255 if (status == SCSI_STATUS_TIMEOUT) { 256 /* make sure the request is rescheduled AFTER the 257 * reconnect is initiated */ 258 retry_time = EVENT_INTERVAL * 2; 259 iTask->iscsilun->request_timed_out = true; 260 } 261 error_report("iSCSI Busy/TaskSetFull/TimeOut" 262 " (retry #%u in %u ms): %s", 263 iTask->retries, retry_time, 264 iscsi_get_error(iscsi)); 265 aio_timer_init(iTask->iscsilun->aio_context, 266 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 267 SCALE_MS, iscsi_retry_timer_expired, iTask); 268 timer_mod(&iTask->retry_timer, 269 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 270 iTask->do_retry = 1; 271 } else if (status == SCSI_STATUS_CHECK_CONDITION) { 272 int error = iscsi_translate_sense(&task->sense); 273 if (error == EAGAIN) { 274 error_report("iSCSI CheckCondition: %s", 275 iscsi_get_error(iscsi)); 276 iTask->do_retry = 1; 277 } else { 278 iTask->err_code = -error; 279 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 280 } 281 } 282 } 283 } 284 285 if (iTask->co) { 286 replay_bh_schedule_oneshot_event(iTask->iscsilun->aio_context, 287 iscsi_co_generic_bh_cb, iTask); 288 } else { 289 iTask->complete = 1; 290 } 291 } 292 293 static void coroutine_fn 294 iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 295 { 296 *iTask = (struct IscsiTask) { 297 .co = qemu_coroutine_self(), 298 .iscsilun = iscsilun, 299 }; 300 } 301 302 #ifdef __linux__ 303 304 /* Called (via iscsi_service) with QemuMutex held. */ 305 static void 306 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 307 void *private_data) 308 { 309 IscsiAIOCB *acb = private_data; 310 311 /* If the command callback hasn't been called yet, drop the task */ 312 if (!acb->bh) { 313 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 314 iscsi_scsi_cancel_task(iscsi, acb->task); 315 } 316 317 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 318 } 319 320 static void 321 iscsi_aio_cancel(BlockAIOCB *blockacb) 322 { 323 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 324 IscsiLun *iscsilun = acb->iscsilun; 325 326 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) { 327 328 /* If it was cancelled or completed already, our work is done here */ 329 if (acb->cancelled || acb->status != -EINPROGRESS) { 330 return; 331 } 332 333 acb->cancelled = true; 334 335 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 336 337 /* send a task mgmt call to the target to cancel the task on the target */ 338 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 339 iscsi_abort_task_cb, acb) < 0) { 340 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 341 } 342 } 343 } 344 345 static const AIOCBInfo iscsi_aiocb_info = { 346 .aiocb_size = sizeof(IscsiAIOCB), 347 .cancel_async = iscsi_aio_cancel, 348 }; 349 350 #endif 351 352 static void iscsi_process_read(void *arg); 353 static void iscsi_process_write(void *arg); 354 355 /* Called with QemuMutex held. */ 356 static void 357 iscsi_set_events(IscsiLun *iscsilun) 358 { 359 struct iscsi_context *iscsi = iscsilun->iscsi; 360 int ev = iscsi_which_events(iscsi); 361 362 if (ev != iscsilun->events) { 363 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 364 false, 365 (ev & POLLIN) ? iscsi_process_read : NULL, 366 (ev & POLLOUT) ? iscsi_process_write : NULL, 367 NULL, NULL, 368 iscsilun); 369 iscsilun->events = ev; 370 } 371 } 372 373 static void iscsi_timed_check_events(void *opaque) 374 { 375 IscsiLun *iscsilun = opaque; 376 377 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) { 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 /* 387 * newer versions of libiscsi may return zero events. Ensure we are 388 * able to return to service once this situation changes. 389 */ 390 iscsi_set_events(iscsilun); 391 } 392 393 timer_mod(iscsilun->event_timer, 394 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 395 } 396 397 static void 398 iscsi_process_read(void *arg) 399 { 400 IscsiLun *iscsilun = arg; 401 struct iscsi_context *iscsi = iscsilun->iscsi; 402 403 qemu_mutex_lock(&iscsilun->mutex); 404 iscsi_service(iscsi, POLLIN); 405 iscsi_set_events(iscsilun); 406 qemu_mutex_unlock(&iscsilun->mutex); 407 } 408 409 static void 410 iscsi_process_write(void *arg) 411 { 412 IscsiLun *iscsilun = arg; 413 struct iscsi_context *iscsi = iscsilun->iscsi; 414 415 qemu_mutex_lock(&iscsilun->mutex); 416 iscsi_service(iscsi, POLLOUT); 417 iscsi_set_events(iscsilun); 418 qemu_mutex_unlock(&iscsilun->mutex); 419 } 420 421 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 422 { 423 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 424 } 425 426 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 427 { 428 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 429 } 430 431 static bool is_byte_request_lun_aligned(int64_t offset, int64_t bytes, 432 IscsiLun *iscsilun) 433 { 434 if (offset % iscsilun->block_size || bytes % iscsilun->block_size) { 435 error_report("iSCSI misaligned request: " 436 "iscsilun->block_size %u, offset %" PRIi64 437 ", bytes %" PRIi64, 438 iscsilun->block_size, offset, bytes); 439 return false; 440 } 441 return true; 442 } 443 444 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 445 IscsiLun *iscsilun) 446 { 447 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 448 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 449 nb_sectors << BDRV_SECTOR_BITS, 450 iscsilun); 451 } 452 453 static void iscsi_allocmap_free(IscsiLun *iscsilun) 454 { 455 g_free(iscsilun->allocmap); 456 g_free(iscsilun->allocmap_valid); 457 iscsilun->allocmap = NULL; 458 iscsilun->allocmap_valid = NULL; 459 } 460 461 462 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 463 { 464 iscsi_allocmap_free(iscsilun); 465 466 assert(iscsilun->cluster_size); 467 iscsilun->allocmap_size = 468 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 469 iscsilun->cluster_size); 470 471 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 472 if (!iscsilun->allocmap) { 473 return -ENOMEM; 474 } 475 476 if (open_flags & BDRV_O_NOCACHE) { 477 /* when cache.direct = on all allocmap entries are 478 * treated as invalid to force a relookup of the block 479 * status on every read request */ 480 return 0; 481 } 482 483 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 484 if (!iscsilun->allocmap_valid) { 485 /* if we are under memory pressure free the allocmap as well */ 486 iscsi_allocmap_free(iscsilun); 487 return -ENOMEM; 488 } 489 490 return 0; 491 } 492 493 static void 494 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 495 int64_t bytes, bool allocated, bool valid) 496 { 497 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 498 499 if (iscsilun->allocmap == NULL) { 500 return; 501 } 502 /* expand to entirely contain all affected clusters */ 503 assert(iscsilun->cluster_size); 504 cl_num_expanded = offset / iscsilun->cluster_size; 505 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 506 iscsilun->cluster_size) - cl_num_expanded; 507 /* shrink to touch only completely contained clusters */ 508 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 509 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 510 if (allocated) { 511 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 512 } else { 513 if (nb_cls_shrunk > 0) { 514 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 515 } 516 } 517 518 if (iscsilun->allocmap_valid == NULL) { 519 return; 520 } 521 if (valid) { 522 if (nb_cls_shrunk > 0) { 523 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 524 } 525 } else { 526 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 527 nb_cls_expanded); 528 } 529 } 530 531 static void 532 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 533 int64_t bytes) 534 { 535 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 536 } 537 538 static void 539 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 540 int64_t bytes) 541 { 542 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 543 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 544 */ 545 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 546 } 547 548 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 549 int64_t bytes) 550 { 551 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 552 } 553 554 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 555 { 556 if (iscsilun->allocmap) { 557 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 558 } 559 if (iscsilun->allocmap_valid) { 560 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 561 } 562 } 563 564 static inline bool 565 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 566 int64_t bytes) 567 { 568 unsigned long size; 569 if (iscsilun->allocmap == NULL) { 570 return true; 571 } 572 assert(iscsilun->cluster_size); 573 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 574 return !(find_next_bit(iscsilun->allocmap, size, 575 offset / iscsilun->cluster_size) == size); 576 } 577 578 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 579 int64_t offset, int64_t bytes) 580 { 581 unsigned long size; 582 if (iscsilun->allocmap_valid == NULL) { 583 return false; 584 } 585 assert(iscsilun->cluster_size); 586 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 587 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 588 offset / iscsilun->cluster_size) == size); 589 } 590 591 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 592 IscsiLun *iscsilun) 593 { 594 while (!iTask->complete) { 595 iscsi_set_events(iscsilun); 596 qemu_mutex_unlock(&iscsilun->mutex); 597 qemu_coroutine_yield(); 598 qemu_mutex_lock(&iscsilun->mutex); 599 } 600 } 601 602 static int coroutine_fn 603 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 604 QEMUIOVector *iov, int flags) 605 { 606 IscsiLun *iscsilun = bs->opaque; 607 struct IscsiTask iTask; 608 uint64_t lba; 609 uint32_t num_sectors; 610 bool fua = flags & BDRV_REQ_FUA; 611 int r = 0; 612 613 if (fua) { 614 assert(iscsilun->dpofua); 615 } 616 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 617 return -EINVAL; 618 } 619 620 if (bs->bl.max_transfer) { 621 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 622 } 623 624 lba = sector_qemu2lun(sector_num, iscsilun); 625 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 626 iscsi_co_init_iscsitask(iscsilun, &iTask); 627 qemu_mutex_lock(&iscsilun->mutex); 628 retry: 629 if (iscsilun->use_16_for_rw) { 630 #if LIBISCSI_API_VERSION >= (20160603) 631 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 632 NULL, num_sectors * iscsilun->block_size, 633 iscsilun->block_size, 0, 0, fua, 0, 0, 634 iscsi_co_generic_cb, &iTask, 635 (struct scsi_iovec *)iov->iov, iov->niov); 636 } else { 637 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 638 NULL, num_sectors * iscsilun->block_size, 639 iscsilun->block_size, 0, 0, fua, 0, 0, 640 iscsi_co_generic_cb, &iTask, 641 (struct scsi_iovec *)iov->iov, iov->niov); 642 } 643 #else 644 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 645 NULL, num_sectors * iscsilun->block_size, 646 iscsilun->block_size, 0, 0, fua, 0, 0, 647 iscsi_co_generic_cb, &iTask); 648 } else { 649 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 650 NULL, num_sectors * iscsilun->block_size, 651 iscsilun->block_size, 0, 0, fua, 0, 0, 652 iscsi_co_generic_cb, &iTask); 653 } 654 #endif 655 if (iTask.task == NULL) { 656 qemu_mutex_unlock(&iscsilun->mutex); 657 return -ENOMEM; 658 } 659 #if LIBISCSI_API_VERSION < (20160603) 660 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 661 iov->niov); 662 #endif 663 iscsi_co_wait_for_task(&iTask, iscsilun); 664 665 if (iTask.task != NULL) { 666 scsi_free_scsi_task(iTask.task); 667 iTask.task = NULL; 668 } 669 670 if (iTask.do_retry) { 671 iTask.complete = 0; 672 goto retry; 673 } 674 675 if (iTask.status != SCSI_STATUS_GOOD) { 676 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 677 nb_sectors * BDRV_SECTOR_SIZE); 678 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 679 iTask.err_str); 680 r = iTask.err_code; 681 goto out_unlock; 682 } 683 684 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 685 nb_sectors * BDRV_SECTOR_SIZE); 686 687 out_unlock: 688 qemu_mutex_unlock(&iscsilun->mutex); 689 g_free(iTask.err_str); 690 return r; 691 } 692 693 694 695 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 696 bool want_zero, int64_t offset, 697 int64_t bytes, int64_t *pnum, 698 int64_t *map, 699 BlockDriverState **file) 700 { 701 IscsiLun *iscsilun = bs->opaque; 702 struct scsi_get_lba_status *lbas = NULL; 703 struct scsi_lba_status_descriptor *lbasd = NULL; 704 struct IscsiTask iTask; 705 uint64_t lba, max_bytes; 706 int ret; 707 708 iscsi_co_init_iscsitask(iscsilun, &iTask); 709 710 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 711 712 /* default to all sectors allocated */ 713 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 714 if (map) { 715 *map = offset; 716 } 717 *pnum = bytes; 718 719 /* LUN does not support logical block provisioning */ 720 if (!iscsilun->lbpme) { 721 goto out; 722 } 723 724 lba = offset / iscsilun->block_size; 725 max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size; 726 727 qemu_mutex_lock(&iscsilun->mutex); 728 retry: 729 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 730 lba, 8 + 16, iscsi_co_generic_cb, 731 &iTask) == NULL) { 732 ret = -ENOMEM; 733 goto out_unlock; 734 } 735 iscsi_co_wait_for_task(&iTask, iscsilun); 736 737 if (iTask.do_retry) { 738 if (iTask.task != NULL) { 739 scsi_free_scsi_task(iTask.task); 740 iTask.task = NULL; 741 } 742 iTask.complete = 0; 743 goto retry; 744 } 745 746 if (iTask.status != SCSI_STATUS_GOOD) { 747 /* in case the get_lba_status_callout fails (i.e. 748 * because the device is busy or the cmd is not 749 * supported) we pretend all blocks are allocated 750 * for backwards compatibility */ 751 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 752 lba, iTask.err_str); 753 goto out_unlock; 754 } 755 756 lbas = scsi_datain_unmarshall(iTask.task); 757 if (lbas == NULL || lbas->num_descriptors == 0) { 758 ret = -EIO; 759 goto out_unlock; 760 } 761 762 lbasd = &lbas->descriptors[0]; 763 764 if (lba != lbasd->lba) { 765 ret = -EIO; 766 goto out_unlock; 767 } 768 769 *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes); 770 771 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 772 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 773 ret &= ~BDRV_BLOCK_DATA; 774 if (iscsilun->lbprz) { 775 ret |= BDRV_BLOCK_ZERO; 776 } 777 } 778 779 if (ret & BDRV_BLOCK_ZERO) { 780 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 781 } else { 782 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 783 } 784 785 out_unlock: 786 qemu_mutex_unlock(&iscsilun->mutex); 787 g_free(iTask.err_str); 788 out: 789 if (iTask.task != NULL) { 790 scsi_free_scsi_task(iTask.task); 791 } 792 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 793 *file = bs; 794 } 795 return ret; 796 } 797 798 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 799 int64_t sector_num, int nb_sectors, 800 QEMUIOVector *iov) 801 { 802 IscsiLun *iscsilun = bs->opaque; 803 struct IscsiTask iTask; 804 uint64_t lba; 805 uint32_t num_sectors; 806 int r = 0; 807 808 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 809 return -EINVAL; 810 } 811 812 if (bs->bl.max_transfer) { 813 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 814 } 815 816 /* if cache.direct is off and we have a valid entry in our allocation map 817 * we can skip checking the block status and directly return zeroes if 818 * the request falls within an unallocated area */ 819 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 820 nb_sectors * BDRV_SECTOR_SIZE) && 821 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 822 nb_sectors * BDRV_SECTOR_SIZE)) { 823 qemu_iovec_memset(iov, 0, 0x00, iov->size); 824 return 0; 825 } 826 827 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 828 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 829 nb_sectors * BDRV_SECTOR_SIZE) && 830 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 831 nb_sectors * BDRV_SECTOR_SIZE)) { 832 int64_t pnum; 833 /* check the block status from the beginning of the cluster 834 * containing the start sector */ 835 int64_t head; 836 int ret; 837 838 assert(iscsilun->cluster_size); 839 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 840 ret = iscsi_co_block_status(bs, true, 841 sector_num * BDRV_SECTOR_SIZE - head, 842 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 843 if (ret < 0) { 844 return ret; 845 } 846 /* if the whole request falls into an unallocated area we can avoid 847 * reading and directly return zeroes instead */ 848 if (ret & BDRV_BLOCK_ZERO && 849 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 850 qemu_iovec_memset(iov, 0, 0x00, iov->size); 851 return 0; 852 } 853 } 854 855 lba = sector_qemu2lun(sector_num, iscsilun); 856 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 857 858 iscsi_co_init_iscsitask(iscsilun, &iTask); 859 qemu_mutex_lock(&iscsilun->mutex); 860 retry: 861 if (iscsilun->use_16_for_rw) { 862 #if LIBISCSI_API_VERSION >= (20160603) 863 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 864 num_sectors * iscsilun->block_size, 865 iscsilun->block_size, 0, 0, 0, 0, 0, 866 iscsi_co_generic_cb, &iTask, 867 (struct scsi_iovec *)iov->iov, iov->niov); 868 } else { 869 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 870 num_sectors * iscsilun->block_size, 871 iscsilun->block_size, 872 0, 0, 0, 0, 0, 873 iscsi_co_generic_cb, &iTask, 874 (struct scsi_iovec *)iov->iov, iov->niov); 875 } 876 #else 877 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 878 num_sectors * iscsilun->block_size, 879 iscsilun->block_size, 0, 0, 0, 0, 0, 880 iscsi_co_generic_cb, &iTask); 881 } else { 882 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 883 num_sectors * iscsilun->block_size, 884 iscsilun->block_size, 885 0, 0, 0, 0, 0, 886 iscsi_co_generic_cb, &iTask); 887 } 888 #endif 889 if (iTask.task == NULL) { 890 qemu_mutex_unlock(&iscsilun->mutex); 891 return -ENOMEM; 892 } 893 #if LIBISCSI_API_VERSION < (20160603) 894 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 895 #endif 896 897 iscsi_co_wait_for_task(&iTask, iscsilun); 898 if (iTask.task != NULL) { 899 scsi_free_scsi_task(iTask.task); 900 iTask.task = NULL; 901 } 902 903 if (iTask.do_retry) { 904 iTask.complete = 0; 905 goto retry; 906 } 907 908 if (iTask.status != SCSI_STATUS_GOOD) { 909 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 910 lba, iTask.err_str); 911 r = iTask.err_code; 912 } 913 914 qemu_mutex_unlock(&iscsilun->mutex); 915 g_free(iTask.err_str); 916 return r; 917 } 918 919 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 920 { 921 IscsiLun *iscsilun = bs->opaque; 922 struct IscsiTask iTask; 923 int r = 0; 924 925 iscsi_co_init_iscsitask(iscsilun, &iTask); 926 qemu_mutex_lock(&iscsilun->mutex); 927 retry: 928 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 929 0, iscsi_co_generic_cb, &iTask) == NULL) { 930 qemu_mutex_unlock(&iscsilun->mutex); 931 return -ENOMEM; 932 } 933 934 iscsi_co_wait_for_task(&iTask, iscsilun); 935 936 if (iTask.task != NULL) { 937 scsi_free_scsi_task(iTask.task); 938 iTask.task = NULL; 939 } 940 941 if (iTask.do_retry) { 942 iTask.complete = 0; 943 goto retry; 944 } 945 946 if (iTask.status != SCSI_STATUS_GOOD) { 947 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 948 r = iTask.err_code; 949 } 950 951 qemu_mutex_unlock(&iscsilun->mutex); 952 g_free(iTask.err_str); 953 return r; 954 } 955 956 #ifdef __linux__ 957 /* Called (via iscsi_service) with QemuMutex held. */ 958 static void 959 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 960 void *command_data, void *opaque) 961 { 962 IscsiAIOCB *acb = opaque; 963 964 if (status == SCSI_STATUS_CANCELLED) { 965 if (!acb->bh) { 966 acb->status = -ECANCELED; 967 iscsi_schedule_bh(acb); 968 } 969 return; 970 } 971 972 acb->status = 0; 973 if (status < 0) { 974 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 975 iscsi_get_error(iscsi)); 976 acb->status = -iscsi_translate_sense(&acb->task->sense); 977 } 978 979 acb->ioh->driver_status = 0; 980 acb->ioh->host_status = 0; 981 acb->ioh->resid = 0; 982 acb->ioh->status = status; 983 984 #define SG_ERR_DRIVER_SENSE 0x08 985 986 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 987 int ss; 988 989 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 990 991 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 992 ss = MIN(acb->ioh->mx_sb_len, acb->ioh->sb_len_wr); 993 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 994 } 995 996 iscsi_schedule_bh(acb); 997 } 998 999 static void iscsi_ioctl_bh_completion(void *opaque) 1000 { 1001 IscsiAIOCB *acb = opaque; 1002 1003 qemu_bh_delete(acb->bh); 1004 acb->common.cb(acb->common.opaque, acb->ret); 1005 qemu_aio_unref(acb); 1006 } 1007 1008 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 1009 { 1010 BlockDriverState *bs = acb->common.bs; 1011 IscsiLun *iscsilun = bs->opaque; 1012 int ret = 0; 1013 1014 switch (req) { 1015 case SG_GET_VERSION_NUM: 1016 *(int *)buf = 30000; 1017 break; 1018 case SG_GET_SCSI_ID: 1019 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 1020 break; 1021 default: 1022 ret = -EINVAL; 1023 } 1024 assert(!acb->bh); 1025 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 1026 iscsi_ioctl_bh_completion, acb); 1027 acb->ret = ret; 1028 qemu_bh_schedule(acb->bh); 1029 } 1030 1031 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1032 unsigned long int req, void *buf, 1033 BlockCompletionFunc *cb, void *opaque) 1034 { 1035 IscsiLun *iscsilun = bs->opaque; 1036 struct iscsi_context *iscsi = iscsilun->iscsi; 1037 struct iscsi_data data; 1038 IscsiAIOCB *acb; 1039 1040 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1041 1042 acb->iscsilun = iscsilun; 1043 acb->bh = NULL; 1044 acb->status = -EINPROGRESS; 1045 acb->ioh = buf; 1046 acb->cancelled = false; 1047 1048 if (req != SG_IO) { 1049 iscsi_ioctl_handle_emulated(acb, req, buf); 1050 return &acb->common; 1051 } 1052 1053 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1054 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1055 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1056 qemu_aio_unref(acb); 1057 return NULL; 1058 } 1059 1060 acb->task = malloc(sizeof(struct scsi_task)); 1061 if (acb->task == NULL) { 1062 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1063 iscsi_get_error(iscsi)); 1064 qemu_aio_unref(acb); 1065 return NULL; 1066 } 1067 memset(acb->task, 0, sizeof(struct scsi_task)); 1068 1069 switch (acb->ioh->dxfer_direction) { 1070 case SG_DXFER_TO_DEV: 1071 acb->task->xfer_dir = SCSI_XFER_WRITE; 1072 break; 1073 case SG_DXFER_FROM_DEV: 1074 acb->task->xfer_dir = SCSI_XFER_READ; 1075 break; 1076 default: 1077 acb->task->xfer_dir = SCSI_XFER_NONE; 1078 break; 1079 } 1080 1081 acb->task->cdb_size = acb->ioh->cmd_len; 1082 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1083 acb->task->expxferlen = acb->ioh->dxfer_len; 1084 1085 data.size = 0; 1086 qemu_mutex_lock(&iscsilun->mutex); 1087 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1088 if (acb->ioh->iovec_count == 0) { 1089 data.data = acb->ioh->dxferp; 1090 data.size = acb->ioh->dxfer_len; 1091 } else { 1092 scsi_task_set_iov_out(acb->task, 1093 (struct scsi_iovec *) acb->ioh->dxferp, 1094 acb->ioh->iovec_count); 1095 } 1096 } 1097 1098 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1099 iscsi_aio_ioctl_cb, 1100 (data.size > 0) ? &data : NULL, 1101 acb) != 0) { 1102 qemu_mutex_unlock(&iscsilun->mutex); 1103 scsi_free_scsi_task(acb->task); 1104 qemu_aio_unref(acb); 1105 return NULL; 1106 } 1107 1108 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1109 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1110 if (acb->ioh->iovec_count == 0) { 1111 scsi_task_add_data_in_buffer(acb->task, 1112 acb->ioh->dxfer_len, 1113 acb->ioh->dxferp); 1114 } else { 1115 scsi_task_set_iov_in(acb->task, 1116 (struct scsi_iovec *) acb->ioh->dxferp, 1117 acb->ioh->iovec_count); 1118 } 1119 } 1120 1121 iscsi_set_events(iscsilun); 1122 qemu_mutex_unlock(&iscsilun->mutex); 1123 1124 return &acb->common; 1125 } 1126 1127 #endif 1128 1129 static int64_t 1130 iscsi_getlength(BlockDriverState *bs) 1131 { 1132 IscsiLun *iscsilun = bs->opaque; 1133 int64_t len; 1134 1135 len = iscsilun->num_blocks; 1136 len *= iscsilun->block_size; 1137 1138 return len; 1139 } 1140 1141 static int 1142 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, 1143 int64_t bytes) 1144 { 1145 IscsiLun *iscsilun = bs->opaque; 1146 struct IscsiTask iTask; 1147 struct unmap_list list; 1148 int r = 0; 1149 1150 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1151 return -ENOTSUP; 1152 } 1153 1154 if (!iscsilun->lbp.lbpu) { 1155 /* UNMAP is not supported by the target */ 1156 return 0; 1157 } 1158 1159 /* 1160 * We don't want to overflow list.num which is uint32_t. 1161 * We rely on our max_pdiscard. 1162 */ 1163 assert(bytes / iscsilun->block_size <= UINT32_MAX); 1164 1165 list.lba = offset / iscsilun->block_size; 1166 list.num = bytes / iscsilun->block_size; 1167 1168 iscsi_co_init_iscsitask(iscsilun, &iTask); 1169 qemu_mutex_lock(&iscsilun->mutex); 1170 retry: 1171 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1172 iscsi_co_generic_cb, &iTask) == NULL) { 1173 r = -ENOMEM; 1174 goto out_unlock; 1175 } 1176 1177 iscsi_co_wait_for_task(&iTask, iscsilun); 1178 1179 if (iTask.task != NULL) { 1180 scsi_free_scsi_task(iTask.task); 1181 iTask.task = NULL; 1182 } 1183 1184 if (iTask.do_retry) { 1185 iTask.complete = 0; 1186 goto retry; 1187 } 1188 1189 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1190 1191 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1192 /* the target might fail with a check condition if it 1193 is not happy with the alignment of the UNMAP request 1194 we silently fail in this case */ 1195 goto out_unlock; 1196 } 1197 1198 if (iTask.status != SCSI_STATUS_GOOD) { 1199 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1200 list.lba, iTask.err_str); 1201 r = iTask.err_code; 1202 goto out_unlock; 1203 } 1204 1205 out_unlock: 1206 qemu_mutex_unlock(&iscsilun->mutex); 1207 g_free(iTask.err_str); 1208 return r; 1209 } 1210 1211 static int 1212 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1213 int64_t bytes, BdrvRequestFlags flags) 1214 { 1215 IscsiLun *iscsilun = bs->opaque; 1216 struct IscsiTask iTask; 1217 uint64_t lba; 1218 uint64_t nb_blocks; 1219 bool use_16_for_ws = iscsilun->use_16_for_rw; 1220 int r = 0; 1221 1222 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1223 return -ENOTSUP; 1224 } 1225 1226 if (flags & BDRV_REQ_MAY_UNMAP) { 1227 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1228 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1229 use_16_for_ws = true; 1230 } 1231 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1232 /* WRITESAME16 with UNMAP is not supported by the target, 1233 * fall back and try WRITESAME10/16 without UNMAP */ 1234 flags &= ~BDRV_REQ_MAY_UNMAP; 1235 use_16_for_ws = iscsilun->use_16_for_rw; 1236 } 1237 } 1238 1239 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1240 /* WRITESAME without UNMAP is not supported by the target */ 1241 return -ENOTSUP; 1242 } 1243 1244 lba = offset / iscsilun->block_size; 1245 nb_blocks = bytes / iscsilun->block_size; 1246 1247 if (iscsilun->zeroblock == NULL) { 1248 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1249 if (iscsilun->zeroblock == NULL) { 1250 return -ENOMEM; 1251 } 1252 } 1253 1254 qemu_mutex_lock(&iscsilun->mutex); 1255 iscsi_co_init_iscsitask(iscsilun, &iTask); 1256 retry: 1257 if (use_16_for_ws) { 1258 /* 1259 * iscsi_writesame16_task num_blocks argument is uint32_t. We rely here 1260 * on our max_pwrite_zeroes limit. 1261 */ 1262 assert(nb_blocks <= UINT32_MAX); 1263 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1264 iscsilun->zeroblock, iscsilun->block_size, 1265 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1266 0, 0, iscsi_co_generic_cb, &iTask); 1267 } else { 1268 /* 1269 * iscsi_writesame10_task num_blocks argument is uint16_t. We rely here 1270 * on our max_pwrite_zeroes limit. 1271 */ 1272 assert(nb_blocks <= UINT16_MAX); 1273 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1274 iscsilun->zeroblock, iscsilun->block_size, 1275 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1276 0, 0, iscsi_co_generic_cb, &iTask); 1277 } 1278 if (iTask.task == NULL) { 1279 qemu_mutex_unlock(&iscsilun->mutex); 1280 return -ENOMEM; 1281 } 1282 1283 iscsi_co_wait_for_task(&iTask, iscsilun); 1284 1285 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1286 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1287 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1288 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1289 /* WRITE SAME is not supported by the target */ 1290 iscsilun->has_write_same = false; 1291 scsi_free_scsi_task(iTask.task); 1292 r = -ENOTSUP; 1293 goto out_unlock; 1294 } 1295 1296 if (iTask.task != NULL) { 1297 scsi_free_scsi_task(iTask.task); 1298 iTask.task = NULL; 1299 } 1300 1301 if (iTask.do_retry) { 1302 iTask.complete = 0; 1303 goto retry; 1304 } 1305 1306 if (iTask.status != SCSI_STATUS_GOOD) { 1307 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1308 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1309 lba, iTask.err_str); 1310 r = iTask.err_code; 1311 goto out_unlock; 1312 } 1313 1314 if (flags & BDRV_REQ_MAY_UNMAP) { 1315 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1316 } else { 1317 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1318 } 1319 1320 out_unlock: 1321 qemu_mutex_unlock(&iscsilun->mutex); 1322 g_free(iTask.err_str); 1323 return r; 1324 } 1325 1326 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1327 Error **errp) 1328 { 1329 const char *user = NULL; 1330 const char *password = NULL; 1331 const char *secretid; 1332 char *secret = NULL; 1333 1334 user = qemu_opt_get(opts, "user"); 1335 if (!user) { 1336 return; 1337 } 1338 1339 secretid = qemu_opt_get(opts, "password-secret"); 1340 password = qemu_opt_get(opts, "password"); 1341 if (secretid && password) { 1342 error_setg(errp, "'password' and 'password-secret' properties are " 1343 "mutually exclusive"); 1344 return; 1345 } 1346 if (secretid) { 1347 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1348 if (!secret) { 1349 return; 1350 } 1351 password = secret; 1352 } else if (!password) { 1353 error_setg(errp, "CHAP username specified but no password was given"); 1354 return; 1355 } 1356 1357 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1358 error_setg(errp, "Failed to set initiator username and password"); 1359 } 1360 1361 g_free(secret); 1362 } 1363 1364 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1365 Error **errp) 1366 { 1367 const char *digest = NULL; 1368 1369 digest = qemu_opt_get(opts, "header-digest"); 1370 if (!digest) { 1371 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1372 } else if (!strcmp(digest, "crc32c")) { 1373 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1374 } else if (!strcmp(digest, "none")) { 1375 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1376 } else if (!strcmp(digest, "crc32c-none")) { 1377 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1378 } else if (!strcmp(digest, "none-crc32c")) { 1379 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1380 } else { 1381 error_setg(errp, "Invalid header-digest setting : %s", digest); 1382 } 1383 } 1384 1385 static char *get_initiator_name(QemuOpts *opts) 1386 { 1387 const char *name; 1388 char *iscsi_name; 1389 UuidInfo *uuid_info; 1390 1391 name = qemu_opt_get(opts, "initiator-name"); 1392 if (name) { 1393 return g_strdup(name); 1394 } 1395 1396 uuid_info = qmp_query_uuid(NULL); 1397 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1398 name = qemu_get_vm_name(); 1399 } else { 1400 name = uuid_info->UUID; 1401 } 1402 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1403 name ? ":" : "", name ? name : ""); 1404 qapi_free_UuidInfo(uuid_info); 1405 return iscsi_name; 1406 } 1407 1408 static void iscsi_nop_timed_event(void *opaque) 1409 { 1410 IscsiLun *iscsilun = opaque; 1411 1412 QEMU_LOCK_GUARD(&iscsilun->mutex); 1413 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1414 error_report("iSCSI: NOP timeout. Reconnecting..."); 1415 iscsilun->request_timed_out = true; 1416 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1417 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1418 return; 1419 } 1420 1421 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1422 iscsi_set_events(iscsilun); 1423 } 1424 1425 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1426 { 1427 struct scsi_task *task = NULL; 1428 struct scsi_readcapacity10 *rc10 = NULL; 1429 struct scsi_readcapacity16 *rc16 = NULL; 1430 int retries = ISCSI_CMD_RETRIES; 1431 1432 do { 1433 if (task != NULL) { 1434 scsi_free_scsi_task(task); 1435 task = NULL; 1436 } 1437 1438 switch (iscsilun->type) { 1439 case TYPE_DISK: 1440 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1441 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1442 rc16 = scsi_datain_unmarshall(task); 1443 if (rc16 == NULL) { 1444 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1445 } else { 1446 iscsilun->block_size = rc16->block_length; 1447 iscsilun->num_blocks = rc16->returned_lba + 1; 1448 iscsilun->lbpme = !!rc16->lbpme; 1449 iscsilun->lbprz = !!rc16->lbprz; 1450 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1451 } 1452 break; 1453 } 1454 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1455 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1456 break; 1457 } 1458 /* Fall through and try READ CAPACITY(10) instead. */ 1459 case TYPE_ROM: 1460 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1461 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1462 rc10 = scsi_datain_unmarshall(task); 1463 if (rc10 == NULL) { 1464 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1465 } else { 1466 iscsilun->block_size = rc10->block_size; 1467 if (rc10->lba == 0) { 1468 /* blank disk loaded */ 1469 iscsilun->num_blocks = 0; 1470 } else { 1471 iscsilun->num_blocks = rc10->lba + 1; 1472 } 1473 } 1474 } 1475 break; 1476 default: 1477 return; 1478 } 1479 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1480 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1481 && retries-- > 0); 1482 1483 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1484 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1485 } else if (!iscsilun->block_size || 1486 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1487 error_setg(errp, "iSCSI: the target returned an invalid " 1488 "block size of %d.", iscsilun->block_size); 1489 } 1490 if (task) { 1491 scsi_free_scsi_task(task); 1492 } 1493 } 1494 1495 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1496 int evpd, int pc, void **inq, Error **errp) 1497 { 1498 int full_size; 1499 struct scsi_task *task = NULL; 1500 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1501 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1502 goto fail; 1503 } 1504 full_size = scsi_datain_getfullsize(task); 1505 if (full_size > task->datain.size) { 1506 scsi_free_scsi_task(task); 1507 1508 /* we need more data for the full list */ 1509 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1510 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1511 goto fail; 1512 } 1513 } 1514 1515 *inq = scsi_datain_unmarshall(task); 1516 if (*inq == NULL) { 1517 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1518 goto fail_with_err; 1519 } 1520 1521 return task; 1522 1523 fail: 1524 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1525 iscsi_get_error(iscsi)); 1526 fail_with_err: 1527 if (task != NULL) { 1528 scsi_free_scsi_task(task); 1529 } 1530 return NULL; 1531 } 1532 1533 static void iscsi_detach_aio_context(BlockDriverState *bs) 1534 { 1535 IscsiLun *iscsilun = bs->opaque; 1536 1537 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1538 false, NULL, NULL, NULL, NULL, NULL); 1539 iscsilun->events = 0; 1540 1541 if (iscsilun->nop_timer) { 1542 timer_free(iscsilun->nop_timer); 1543 iscsilun->nop_timer = NULL; 1544 } 1545 if (iscsilun->event_timer) { 1546 timer_free(iscsilun->event_timer); 1547 iscsilun->event_timer = NULL; 1548 } 1549 } 1550 1551 static void iscsi_attach_aio_context(BlockDriverState *bs, 1552 AioContext *new_context) 1553 { 1554 IscsiLun *iscsilun = bs->opaque; 1555 1556 iscsilun->aio_context = new_context; 1557 iscsi_set_events(iscsilun); 1558 1559 /* Set up a timer for sending out iSCSI NOPs */ 1560 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1561 QEMU_CLOCK_REALTIME, SCALE_MS, 1562 iscsi_nop_timed_event, iscsilun); 1563 timer_mod(iscsilun->nop_timer, 1564 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1565 1566 /* Set up a timer for periodic calls to iscsi_set_events and to 1567 * scan for command timeout */ 1568 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1569 QEMU_CLOCK_REALTIME, SCALE_MS, 1570 iscsi_timed_check_events, iscsilun); 1571 timer_mod(iscsilun->event_timer, 1572 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1573 } 1574 1575 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1576 { 1577 struct scsi_task *task; 1578 struct scsi_mode_sense *ms = NULL; 1579 iscsilun->write_protected = false; 1580 iscsilun->dpofua = false; 1581 1582 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1583 1, SCSI_MODESENSE_PC_CURRENT, 1584 0x3F, 0, 255); 1585 if (task == NULL) { 1586 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1587 iscsi_get_error(iscsilun->iscsi)); 1588 goto out; 1589 } 1590 1591 if (task->status != SCSI_STATUS_GOOD) { 1592 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1593 goto out; 1594 } 1595 ms = scsi_datain_unmarshall(task); 1596 if (!ms) { 1597 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1598 iscsi_get_error(iscsilun->iscsi)); 1599 goto out; 1600 } 1601 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1602 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1603 1604 out: 1605 if (task) { 1606 scsi_free_scsi_task(task); 1607 } 1608 } 1609 1610 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1611 { 1612 QemuOptsList *list; 1613 QemuOpts *opts; 1614 const char *user, *password, *password_secret, *initiator_name, 1615 *header_digest, *timeout; 1616 1617 list = qemu_find_opts("iscsi"); 1618 if (!list) { 1619 return; 1620 } 1621 1622 opts = qemu_opts_find(list, target); 1623 if (opts == NULL) { 1624 opts = QTAILQ_FIRST(&list->head); 1625 if (!opts) { 1626 return; 1627 } 1628 } 1629 1630 user = qemu_opt_get(opts, "user"); 1631 if (user) { 1632 qdict_set_default_str(options, "user", user); 1633 } 1634 1635 password = qemu_opt_get(opts, "password"); 1636 if (password) { 1637 qdict_set_default_str(options, "password", password); 1638 } 1639 1640 password_secret = qemu_opt_get(opts, "password-secret"); 1641 if (password_secret) { 1642 qdict_set_default_str(options, "password-secret", password_secret); 1643 } 1644 1645 initiator_name = qemu_opt_get(opts, "initiator-name"); 1646 if (initiator_name) { 1647 qdict_set_default_str(options, "initiator-name", initiator_name); 1648 } 1649 1650 header_digest = qemu_opt_get(opts, "header-digest"); 1651 if (header_digest) { 1652 /* -iscsi takes upper case values, but QAPI only supports lower case 1653 * enum constant names, so we have to convert here. */ 1654 char *qapi_value = g_ascii_strdown(header_digest, -1); 1655 qdict_set_default_str(options, "header-digest", qapi_value); 1656 g_free(qapi_value); 1657 } 1658 1659 timeout = qemu_opt_get(opts, "timeout"); 1660 if (timeout) { 1661 qdict_set_default_str(options, "timeout", timeout); 1662 } 1663 } 1664 1665 /* 1666 * We support iscsi url's on the form 1667 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1668 */ 1669 static void iscsi_parse_filename(const char *filename, QDict *options, 1670 Error **errp) 1671 { 1672 struct iscsi_url *iscsi_url; 1673 const char *transport_name; 1674 char *lun_str; 1675 1676 iscsi_url = iscsi_parse_full_url(NULL, filename); 1677 if (iscsi_url == NULL) { 1678 error_setg(errp, "Failed to parse URL : %s", filename); 1679 return; 1680 } 1681 1682 #if LIBISCSI_API_VERSION >= (20160603) 1683 switch (iscsi_url->transport) { 1684 case TCP_TRANSPORT: 1685 transport_name = "tcp"; 1686 break; 1687 case ISER_TRANSPORT: 1688 transport_name = "iser"; 1689 break; 1690 default: 1691 error_setg(errp, "Unknown transport type (%d)", 1692 iscsi_url->transport); 1693 return; 1694 } 1695 #else 1696 transport_name = "tcp"; 1697 #endif 1698 1699 qdict_set_default_str(options, "transport", transport_name); 1700 qdict_set_default_str(options, "portal", iscsi_url->portal); 1701 qdict_set_default_str(options, "target", iscsi_url->target); 1702 1703 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1704 qdict_set_default_str(options, "lun", lun_str); 1705 g_free(lun_str); 1706 1707 /* User/password from -iscsi take precedence over those from the URL */ 1708 iscsi_parse_iscsi_option(iscsi_url->target, options); 1709 1710 if (iscsi_url->user[0] != '\0') { 1711 qdict_set_default_str(options, "user", iscsi_url->user); 1712 qdict_set_default_str(options, "password", iscsi_url->passwd); 1713 } 1714 1715 iscsi_destroy_url(iscsi_url); 1716 } 1717 1718 static QemuOptsList runtime_opts = { 1719 .name = "iscsi", 1720 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1721 .desc = { 1722 { 1723 .name = "transport", 1724 .type = QEMU_OPT_STRING, 1725 }, 1726 { 1727 .name = "portal", 1728 .type = QEMU_OPT_STRING, 1729 }, 1730 { 1731 .name = "target", 1732 .type = QEMU_OPT_STRING, 1733 }, 1734 { 1735 .name = "user", 1736 .type = QEMU_OPT_STRING, 1737 }, 1738 { 1739 .name = "password", 1740 .type = QEMU_OPT_STRING, 1741 }, 1742 { 1743 .name = "password-secret", 1744 .type = QEMU_OPT_STRING, 1745 }, 1746 { 1747 .name = "lun", 1748 .type = QEMU_OPT_NUMBER, 1749 }, 1750 { 1751 .name = "initiator-name", 1752 .type = QEMU_OPT_STRING, 1753 }, 1754 { 1755 .name = "header-digest", 1756 .type = QEMU_OPT_STRING, 1757 }, 1758 { 1759 .name = "timeout", 1760 .type = QEMU_OPT_NUMBER, 1761 }, 1762 { /* end of list */ } 1763 }, 1764 }; 1765 1766 static void iscsi_save_designator(IscsiLun *lun, 1767 struct scsi_inquiry_device_identification *inq_di) 1768 { 1769 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1770 1771 for (desig = inq_di->designators; desig; desig = desig->next) { 1772 if (desig->association || 1773 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1774 continue; 1775 } 1776 /* NAA works better than T10 vendor ID based designator. */ 1777 if (!copy || copy->designator_type < desig->designator_type) { 1778 copy = desig; 1779 } 1780 } 1781 if (copy) { 1782 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1783 *lun->dd = *copy; 1784 lun->dd->next = NULL; 1785 lun->dd->designator = g_malloc(copy->designator_length); 1786 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1787 } 1788 } 1789 1790 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1791 Error **errp) 1792 { 1793 IscsiLun *iscsilun = bs->opaque; 1794 struct iscsi_context *iscsi = NULL; 1795 struct scsi_task *task = NULL; 1796 struct scsi_inquiry_standard *inq = NULL; 1797 struct scsi_inquiry_supported_pages *inq_vpd; 1798 char *initiator_name = NULL; 1799 QemuOpts *opts; 1800 Error *local_err = NULL; 1801 const char *transport_name, *portal, *target; 1802 #if LIBISCSI_API_VERSION >= (20160603) 1803 enum iscsi_transport_type transport; 1804 #endif 1805 int i, ret = 0, timeout = 0, lun; 1806 1807 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1808 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 1809 ret = -EINVAL; 1810 goto out; 1811 } 1812 1813 transport_name = qemu_opt_get(opts, "transport"); 1814 portal = qemu_opt_get(opts, "portal"); 1815 target = qemu_opt_get(opts, "target"); 1816 lun = qemu_opt_get_number(opts, "lun", 0); 1817 1818 if (!transport_name || !portal || !target) { 1819 error_setg(errp, "Need all of transport, portal and target options"); 1820 ret = -EINVAL; 1821 goto out; 1822 } 1823 1824 if (!strcmp(transport_name, "tcp")) { 1825 #if LIBISCSI_API_VERSION >= (20160603) 1826 transport = TCP_TRANSPORT; 1827 } else if (!strcmp(transport_name, "iser")) { 1828 transport = ISER_TRANSPORT; 1829 #else 1830 /* TCP is what older libiscsi versions always use */ 1831 #endif 1832 } else { 1833 error_setg(errp, "Unknown transport: %s", transport_name); 1834 ret = -EINVAL; 1835 goto out; 1836 } 1837 1838 memset(iscsilun, 0, sizeof(IscsiLun)); 1839 1840 initiator_name = get_initiator_name(opts); 1841 1842 iscsi = iscsi_create_context(initiator_name); 1843 if (iscsi == NULL) { 1844 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1845 ret = -ENOMEM; 1846 goto out; 1847 } 1848 #if LIBISCSI_API_VERSION >= (20160603) 1849 if (iscsi_init_transport(iscsi, transport)) { 1850 error_setg(errp, ("Error initializing transport.")); 1851 ret = -EINVAL; 1852 goto out; 1853 } 1854 #endif 1855 if (iscsi_set_targetname(iscsi, target)) { 1856 error_setg(errp, "iSCSI: Failed to set target name."); 1857 ret = -EINVAL; 1858 goto out; 1859 } 1860 1861 /* check if we got CHAP username/password via the options */ 1862 apply_chap(iscsi, opts, &local_err); 1863 if (local_err != NULL) { 1864 error_propagate(errp, local_err); 1865 ret = -EINVAL; 1866 goto out; 1867 } 1868 1869 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1870 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1871 ret = -EINVAL; 1872 goto out; 1873 } 1874 1875 /* check if we got HEADER_DIGEST via the options */ 1876 apply_header_digest(iscsi, opts, &local_err); 1877 if (local_err != NULL) { 1878 error_propagate(errp, local_err); 1879 ret = -EINVAL; 1880 goto out; 1881 } 1882 1883 /* timeout handling is broken in libiscsi before 1.15.0 */ 1884 timeout = qemu_opt_get_number(opts, "timeout", 0); 1885 #if LIBISCSI_API_VERSION >= 20150621 1886 iscsi_set_timeout(iscsi, timeout); 1887 #else 1888 if (timeout) { 1889 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1890 } 1891 #endif 1892 1893 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1894 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1895 iscsi_get_error(iscsi)); 1896 ret = -EINVAL; 1897 goto out; 1898 } 1899 1900 iscsilun->iscsi = iscsi; 1901 iscsilun->aio_context = bdrv_get_aio_context(bs); 1902 iscsilun->lun = lun; 1903 iscsilun->has_write_same = true; 1904 1905 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1906 (void **) &inq, errp); 1907 if (task == NULL) { 1908 ret = -EINVAL; 1909 goto out; 1910 } 1911 iscsilun->type = inq->periperal_device_type; 1912 scsi_free_scsi_task(task); 1913 task = NULL; 1914 1915 iscsi_modesense_sync(iscsilun); 1916 if (iscsilun->dpofua) { 1917 bs->supported_write_flags = BDRV_REQ_FUA; 1918 } 1919 1920 /* Check the write protect flag of the LUN if we want to write */ 1921 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1922 iscsilun->write_protected) { 1923 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1924 if (ret < 0) { 1925 goto out; 1926 } 1927 flags &= ~BDRV_O_RDWR; 1928 } 1929 1930 iscsi_readcapacity_sync(iscsilun, &local_err); 1931 if (local_err != NULL) { 1932 error_propagate(errp, local_err); 1933 ret = -EINVAL; 1934 goto out; 1935 } 1936 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1937 1938 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1939 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1940 * will try to read from the device to guess the image format. 1941 */ 1942 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1943 bs->sg = true; 1944 } 1945 1946 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1947 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1948 (void **) &inq_vpd, errp); 1949 if (task == NULL) { 1950 ret = -EINVAL; 1951 goto out; 1952 } 1953 for (i = 0; i < inq_vpd->num_pages; i++) { 1954 struct scsi_task *inq_task; 1955 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1956 struct scsi_inquiry_block_limits *inq_bl; 1957 struct scsi_inquiry_device_identification *inq_di; 1958 switch (inq_vpd->pages[i]) { 1959 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1960 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1961 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1962 (void **) &inq_lbp, errp); 1963 if (inq_task == NULL) { 1964 ret = -EINVAL; 1965 goto out; 1966 } 1967 memcpy(&iscsilun->lbp, inq_lbp, 1968 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1969 scsi_free_scsi_task(inq_task); 1970 break; 1971 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1972 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1973 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1974 (void **) &inq_bl, errp); 1975 if (inq_task == NULL) { 1976 ret = -EINVAL; 1977 goto out; 1978 } 1979 memcpy(&iscsilun->bl, inq_bl, 1980 sizeof(struct scsi_inquiry_block_limits)); 1981 scsi_free_scsi_task(inq_task); 1982 break; 1983 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1984 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1985 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1986 (void **) &inq_di, errp); 1987 if (inq_task == NULL) { 1988 ret = -EINVAL; 1989 goto out; 1990 } 1991 iscsi_save_designator(iscsilun, inq_di); 1992 scsi_free_scsi_task(inq_task); 1993 break; 1994 default: 1995 break; 1996 } 1997 } 1998 scsi_free_scsi_task(task); 1999 task = NULL; 2000 2001 qemu_mutex_init(&iscsilun->mutex); 2002 iscsi_attach_aio_context(bs, iscsilun->aio_context); 2003 2004 /* Guess the internal cluster (page) size of the iscsi target by the means 2005 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 2006 * reasonable size */ 2007 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 2008 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 2009 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 2010 iscsilun->block_size; 2011 if (iscsilun->lbprz) { 2012 ret = iscsi_allocmap_init(iscsilun, flags); 2013 } 2014 } 2015 2016 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2017 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2018 } 2019 2020 out: 2021 qemu_opts_del(opts); 2022 g_free(initiator_name); 2023 if (task != NULL) { 2024 scsi_free_scsi_task(task); 2025 } 2026 2027 if (ret) { 2028 if (iscsi != NULL) { 2029 if (iscsi_is_logged_in(iscsi)) { 2030 iscsi_logout_sync(iscsi); 2031 } 2032 iscsi_destroy_context(iscsi); 2033 } 2034 memset(iscsilun, 0, sizeof(IscsiLun)); 2035 } 2036 2037 return ret; 2038 } 2039 2040 static void iscsi_close(BlockDriverState *bs) 2041 { 2042 IscsiLun *iscsilun = bs->opaque; 2043 struct iscsi_context *iscsi = iscsilun->iscsi; 2044 2045 iscsi_detach_aio_context(bs); 2046 if (iscsi_is_logged_in(iscsi)) { 2047 iscsi_logout_sync(iscsi); 2048 } 2049 iscsi_destroy_context(iscsi); 2050 if (iscsilun->dd) { 2051 g_free(iscsilun->dd->designator); 2052 g_free(iscsilun->dd); 2053 } 2054 g_free(iscsilun->zeroblock); 2055 iscsi_allocmap_free(iscsilun); 2056 qemu_mutex_destroy(&iscsilun->mutex); 2057 memset(iscsilun, 0, sizeof(IscsiLun)); 2058 } 2059 2060 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2061 { 2062 /* We don't actually refresh here, but just return data queried in 2063 * iscsi_open(): iscsi targets don't change their limits. */ 2064 2065 IscsiLun *iscsilun = bs->opaque; 2066 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2067 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2068 2069 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bdrv_is_sg(bs)); 2070 2071 bs->bl.request_alignment = block_size; 2072 2073 if (iscsilun->bl.max_xfer_len) { 2074 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2075 } 2076 2077 if (max_xfer_len * block_size < INT_MAX) { 2078 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2079 } 2080 2081 if (iscsilun->lbp.lbpu) { 2082 bs->bl.max_pdiscard = 2083 MIN_NON_ZERO(iscsilun->bl.max_unmap * iscsilun->block_size, 2084 (uint64_t)UINT32_MAX * iscsilun->block_size); 2085 bs->bl.pdiscard_alignment = 2086 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2087 } else { 2088 bs->bl.pdiscard_alignment = iscsilun->block_size; 2089 } 2090 2091 bs->bl.max_pwrite_zeroes = 2092 MIN_NON_ZERO(iscsilun->bl.max_ws_len * iscsilun->block_size, 2093 max_xfer_len * iscsilun->block_size); 2094 2095 if (iscsilun->lbp.lbpws) { 2096 bs->bl.pwrite_zeroes_alignment = 2097 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2098 } else { 2099 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2100 } 2101 if (iscsilun->bl.opt_xfer_len && 2102 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2103 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2104 iscsilun->block_size); 2105 } 2106 } 2107 2108 /* Note that this will not re-establish a connection with an iSCSI target - it 2109 * is effectively a NOP. */ 2110 static int iscsi_reopen_prepare(BDRVReopenState *state, 2111 BlockReopenQueue *queue, Error **errp) 2112 { 2113 IscsiLun *iscsilun = state->bs->opaque; 2114 2115 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2116 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2117 return -EACCES; 2118 } 2119 return 0; 2120 } 2121 2122 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2123 { 2124 IscsiLun *iscsilun = reopen_state->bs->opaque; 2125 2126 /* the cache.direct status might have changed */ 2127 if (iscsilun->allocmap != NULL) { 2128 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2129 } 2130 } 2131 2132 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2133 bool exact, PreallocMode prealloc, 2134 BdrvRequestFlags flags, Error **errp) 2135 { 2136 IscsiLun *iscsilun = bs->opaque; 2137 int64_t cur_length; 2138 Error *local_err = NULL; 2139 2140 if (prealloc != PREALLOC_MODE_OFF) { 2141 error_setg(errp, "Unsupported preallocation mode '%s'", 2142 PreallocMode_str(prealloc)); 2143 return -ENOTSUP; 2144 } 2145 2146 if (iscsilun->type != TYPE_DISK) { 2147 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2148 return -ENOTSUP; 2149 } 2150 2151 iscsi_readcapacity_sync(iscsilun, &local_err); 2152 if (local_err != NULL) { 2153 error_propagate(errp, local_err); 2154 return -EIO; 2155 } 2156 2157 cur_length = iscsi_getlength(bs); 2158 if (offset != cur_length && exact) { 2159 error_setg(errp, "Cannot resize iSCSI devices"); 2160 return -ENOTSUP; 2161 } else if (offset > cur_length) { 2162 error_setg(errp, "Cannot grow iSCSI devices"); 2163 return -EINVAL; 2164 } 2165 2166 if (iscsilun->allocmap != NULL) { 2167 iscsi_allocmap_init(iscsilun, bs->open_flags); 2168 } 2169 2170 return 0; 2171 } 2172 2173 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2174 { 2175 IscsiLun *iscsilun = bs->opaque; 2176 bdi->cluster_size = iscsilun->cluster_size; 2177 return 0; 2178 } 2179 2180 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2181 Error **errp) 2182 { 2183 IscsiLun *iscsilun = bs->opaque; 2184 iscsi_allocmap_invalidate(iscsilun); 2185 } 2186 2187 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2188 BdrvChild *src, 2189 int64_t src_offset, 2190 BdrvChild *dst, 2191 int64_t dst_offset, 2192 int64_t bytes, 2193 BdrvRequestFlags read_flags, 2194 BdrvRequestFlags write_flags) 2195 { 2196 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2197 read_flags, write_flags); 2198 } 2199 2200 static struct scsi_task *iscsi_xcopy_task(int param_len) 2201 { 2202 struct scsi_task *task; 2203 2204 task = g_new0(struct scsi_task, 1); 2205 2206 task->cdb[0] = EXTENDED_COPY; 2207 task->cdb[10] = (param_len >> 24) & 0xFF; 2208 task->cdb[11] = (param_len >> 16) & 0xFF; 2209 task->cdb[12] = (param_len >> 8) & 0xFF; 2210 task->cdb[13] = param_len & 0xFF; 2211 task->cdb_size = 16; 2212 task->xfer_dir = SCSI_XFER_WRITE; 2213 task->expxferlen = param_len; 2214 2215 return task; 2216 } 2217 2218 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2219 { 2220 struct scsi_inquiry_device_designator *dd = lun->dd; 2221 2222 memset(desc, 0, 32); 2223 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2224 desc[4] = dd->code_set; 2225 desc[5] = (dd->designator_type & 0xF) 2226 | ((dd->association & 3) << 4); 2227 desc[7] = dd->designator_length; 2228 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2229 2230 desc[28] = 0; 2231 desc[29] = (lun->block_size >> 16) & 0xFF; 2232 desc[30] = (lun->block_size >> 8) & 0xFF; 2233 desc[31] = lun->block_size & 0xFF; 2234 } 2235 2236 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2237 int dst_index) 2238 { 2239 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2240 hdr[1] = ((dc << 1) | cat) & 0xFF; 2241 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2242 /* don't account for the first 4 bytes in descriptor header*/ 2243 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2244 hdr[4] = (src_index >> 8) & 0xFF; 2245 hdr[5] = src_index & 0xFF; 2246 hdr[6] = (dst_index >> 8) & 0xFF; 2247 hdr[7] = dst_index & 0xFF; 2248 } 2249 2250 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2251 int src_index, int dst_index, int num_blks, 2252 uint64_t src_lba, uint64_t dst_lba) 2253 { 2254 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2255 2256 /* The caller should verify the request size */ 2257 assert(num_blks < 65536); 2258 desc[10] = (num_blks >> 8) & 0xFF; 2259 desc[11] = num_blks & 0xFF; 2260 desc[12] = (src_lba >> 56) & 0xFF; 2261 desc[13] = (src_lba >> 48) & 0xFF; 2262 desc[14] = (src_lba >> 40) & 0xFF; 2263 desc[15] = (src_lba >> 32) & 0xFF; 2264 desc[16] = (src_lba >> 24) & 0xFF; 2265 desc[17] = (src_lba >> 16) & 0xFF; 2266 desc[18] = (src_lba >> 8) & 0xFF; 2267 desc[19] = src_lba & 0xFF; 2268 desc[20] = (dst_lba >> 56) & 0xFF; 2269 desc[21] = (dst_lba >> 48) & 0xFF; 2270 desc[22] = (dst_lba >> 40) & 0xFF; 2271 desc[23] = (dst_lba >> 32) & 0xFF; 2272 desc[24] = (dst_lba >> 24) & 0xFF; 2273 desc[25] = (dst_lba >> 16) & 0xFF; 2274 desc[26] = (dst_lba >> 8) & 0xFF; 2275 desc[27] = dst_lba & 0xFF; 2276 } 2277 2278 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2279 int list_id_usage, int prio, 2280 int tgt_desc_len, 2281 int seg_desc_len, int inline_data_len) 2282 { 2283 buf[0] = list_id; 2284 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2285 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2286 buf[3] = tgt_desc_len & 0xFF; 2287 buf[8] = (seg_desc_len >> 24) & 0xFF; 2288 buf[9] = (seg_desc_len >> 16) & 0xFF; 2289 buf[10] = (seg_desc_len >> 8) & 0xFF; 2290 buf[11] = seg_desc_len & 0xFF; 2291 buf[12] = (inline_data_len >> 24) & 0xFF; 2292 buf[13] = (inline_data_len >> 16) & 0xFF; 2293 buf[14] = (inline_data_len >> 8) & 0xFF; 2294 buf[15] = inline_data_len & 0xFF; 2295 } 2296 2297 static void iscsi_xcopy_data(struct iscsi_data *data, 2298 IscsiLun *src, int64_t src_lba, 2299 IscsiLun *dst, int64_t dst_lba, 2300 uint16_t num_blocks) 2301 { 2302 uint8_t *buf; 2303 const int src_offset = XCOPY_DESC_OFFSET; 2304 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2305 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2306 2307 data->size = XCOPY_DESC_OFFSET + 2308 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2309 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2310 data->data = g_malloc0(data->size); 2311 buf = data->data; 2312 2313 /* Initialise the parameter list header */ 2314 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2315 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2316 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2317 0); 2318 2319 /* Initialise CSCD list with one src + one dst descriptor */ 2320 iscsi_populate_target_desc(&buf[src_offset], src); 2321 iscsi_populate_target_desc(&buf[dst_offset], dst); 2322 2323 /* Initialise one segment descriptor */ 2324 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2325 src_lba, dst_lba); 2326 } 2327 2328 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2329 BdrvChild *src, 2330 int64_t src_offset, 2331 BdrvChild *dst, 2332 int64_t dst_offset, 2333 int64_t bytes, 2334 BdrvRequestFlags read_flags, 2335 BdrvRequestFlags write_flags) 2336 { 2337 IscsiLun *dst_lun = dst->bs->opaque; 2338 IscsiLun *src_lun; 2339 struct IscsiTask iscsi_task; 2340 struct iscsi_data data; 2341 int r = 0; 2342 int block_size; 2343 2344 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2345 return -ENOTSUP; 2346 } 2347 src_lun = src->bs->opaque; 2348 2349 if (!src_lun->dd || !dst_lun->dd) { 2350 return -ENOTSUP; 2351 } 2352 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2353 return -ENOTSUP; 2354 } 2355 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2356 return -ENOTSUP; 2357 } 2358 if (dst_lun->block_size != src_lun->block_size || 2359 !dst_lun->block_size) { 2360 return -ENOTSUP; 2361 } 2362 2363 block_size = dst_lun->block_size; 2364 if (bytes / block_size > 65535) { 2365 return -ENOTSUP; 2366 } 2367 2368 iscsi_xcopy_data(&data, 2369 src_lun, src_offset / block_size, 2370 dst_lun, dst_offset / block_size, 2371 bytes / block_size); 2372 2373 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2374 2375 qemu_mutex_lock(&dst_lun->mutex); 2376 iscsi_task.task = iscsi_xcopy_task(data.size); 2377 retry: 2378 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2379 iscsi_task.task, iscsi_co_generic_cb, 2380 &data, 2381 &iscsi_task) != 0) { 2382 r = -EIO; 2383 goto out_unlock; 2384 } 2385 2386 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2387 2388 if (iscsi_task.do_retry) { 2389 iscsi_task.complete = 0; 2390 goto retry; 2391 } 2392 2393 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2394 r = iscsi_task.err_code; 2395 goto out_unlock; 2396 } 2397 2398 out_unlock: 2399 2400 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2401 g_free(iscsi_task.task); 2402 qemu_mutex_unlock(&dst_lun->mutex); 2403 g_free(iscsi_task.err_str); 2404 return r; 2405 } 2406 2407 2408 static const char *const iscsi_strong_runtime_opts[] = { 2409 "transport", 2410 "portal", 2411 "target", 2412 "user", 2413 "password", 2414 "password-secret", 2415 "lun", 2416 "initiator-name", 2417 "header-digest", 2418 2419 NULL 2420 }; 2421 2422 static BlockDriver bdrv_iscsi = { 2423 .format_name = "iscsi", 2424 .protocol_name = "iscsi", 2425 2426 .instance_size = sizeof(IscsiLun), 2427 .bdrv_parse_filename = iscsi_parse_filename, 2428 .bdrv_file_open = iscsi_open, 2429 .bdrv_close = iscsi_close, 2430 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 2431 .create_opts = &bdrv_create_opts_simple, 2432 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2433 .bdrv_reopen_commit = iscsi_reopen_commit, 2434 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2435 2436 .bdrv_getlength = iscsi_getlength, 2437 .bdrv_get_info = iscsi_get_info, 2438 .bdrv_co_truncate = iscsi_co_truncate, 2439 .bdrv_refresh_limits = iscsi_refresh_limits, 2440 2441 .bdrv_co_block_status = iscsi_co_block_status, 2442 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2443 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2444 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2445 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2446 .bdrv_co_readv = iscsi_co_readv, 2447 .bdrv_co_writev = iscsi_co_writev, 2448 .bdrv_co_flush_to_disk = iscsi_co_flush, 2449 2450 #ifdef __linux__ 2451 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2452 #endif 2453 2454 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2455 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2456 2457 .strong_runtime_opts = iscsi_strong_runtime_opts, 2458 }; 2459 2460 #if LIBISCSI_API_VERSION >= (20160603) 2461 static BlockDriver bdrv_iser = { 2462 .format_name = "iser", 2463 .protocol_name = "iser", 2464 2465 .instance_size = sizeof(IscsiLun), 2466 .bdrv_parse_filename = iscsi_parse_filename, 2467 .bdrv_file_open = iscsi_open, 2468 .bdrv_close = iscsi_close, 2469 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 2470 .create_opts = &bdrv_create_opts_simple, 2471 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2472 .bdrv_reopen_commit = iscsi_reopen_commit, 2473 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2474 2475 .bdrv_getlength = iscsi_getlength, 2476 .bdrv_get_info = iscsi_get_info, 2477 .bdrv_co_truncate = iscsi_co_truncate, 2478 .bdrv_refresh_limits = iscsi_refresh_limits, 2479 2480 .bdrv_co_block_status = iscsi_co_block_status, 2481 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2482 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2483 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2484 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2485 .bdrv_co_readv = iscsi_co_readv, 2486 .bdrv_co_writev = iscsi_co_writev, 2487 .bdrv_co_flush_to_disk = iscsi_co_flush, 2488 2489 #ifdef __linux__ 2490 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2491 #endif 2492 2493 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2494 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2495 2496 .strong_runtime_opts = iscsi_strong_runtime_opts, 2497 }; 2498 #endif 2499 2500 static void iscsi_block_init(void) 2501 { 2502 bdrv_register(&bdrv_iscsi); 2503 #if LIBISCSI_API_VERSION >= (20160603) 2504 bdrv_register(&bdrv_iser); 2505 #endif 2506 } 2507 2508 block_init(iscsi_block_init); 2509