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-io.h" 37 #include "block/block_int.h" 38 #include "block/qdict.h" 39 #include "scsi/constants.h" 40 #include "qemu/iov.h" 41 #include "qemu/module.h" 42 #include "qemu/option.h" 43 #include "qemu/uuid.h" 44 #include "sysemu/replay.h" 45 #include "qapi/error.h" 46 #include "qapi/qapi-commands-machine.h" 47 #include "qapi/qmp/qdict.h" 48 #include "qapi/qmp/qstring.h" 49 #include "crypto/secret.h" 50 #include "scsi/utils.h" 51 #include "trace.h" 52 53 /* Conflict between scsi/utils.h and libiscsi! :( */ 54 #define SCSI_XFER_NONE ISCSI_XFER_NONE 55 #include <iscsi/iscsi.h> 56 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */ 57 #include <iscsi/scsi-lowlevel.h> 58 #undef inline 59 #undef SCSI_XFER_NONE 60 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 61 62 #ifdef __linux__ 63 #include <scsi/sg.h> 64 #endif 65 66 typedef struct IscsiLun { 67 struct iscsi_context *iscsi; 68 AioContext *aio_context; 69 int lun; 70 enum scsi_inquiry_peripheral_device_type type; 71 int block_size; 72 uint64_t num_blocks; 73 int events; 74 QEMUTimer *nop_timer; 75 QEMUTimer *event_timer; 76 QemuMutex mutex; 77 struct scsi_inquiry_logical_block_provisioning lbp; 78 struct scsi_inquiry_block_limits bl; 79 struct scsi_inquiry_device_designator *dd; 80 unsigned char *zeroblock; 81 /* The allocmap tracks which clusters (pages) on the iSCSI target are 82 * allocated and which are not. In case a target returns zeros for 83 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 84 * of reading zeros over the wire if a read request falls within an 85 * unallocated block. As there are 3 possible states we need 2 bitmaps to 86 * track. allocmap_valid keeps track if QEMU's information about a page is 87 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 88 * valid information about a page the corresponding allocmap entry should be 89 * switched to unallocated as well to force a new lookup of the allocation 90 * status as lookups are generally skipped if a page is suspect to be 91 * allocated. If a iSCSI target is opened with cache.direct = on the 92 * allocmap_valid does not exist turning all cached information invalid so 93 * that a fresh lookup is made for any page even if allocmap entry returns 94 * it's unallocated. */ 95 unsigned long *allocmap; 96 unsigned long *allocmap_valid; 97 long allocmap_size; 98 int cluster_size; 99 bool use_16_for_rw; 100 bool write_protected; 101 bool lbpme; 102 bool lbprz; 103 bool dpofua; 104 bool has_write_same; 105 bool request_timed_out; 106 } IscsiLun; 107 108 typedef struct IscsiTask { 109 int status; 110 int complete; 111 int retries; 112 int do_retry; 113 struct scsi_task *task; 114 Coroutine *co; 115 IscsiLun *iscsilun; 116 QEMUTimer retry_timer; 117 int err_code; 118 char *err_str; 119 } IscsiTask; 120 121 typedef struct IscsiAIOCB { 122 BlockAIOCB common; 123 QEMUBH *bh; 124 IscsiLun *iscsilun; 125 struct scsi_task *task; 126 int status; 127 int64_t sector_num; 128 int nb_sectors; 129 int ret; 130 #ifdef __linux__ 131 sg_io_hdr_t *ioh; 132 #endif 133 bool cancelled; 134 } IscsiAIOCB; 135 136 /* libiscsi uses time_t so its enough to process events every second */ 137 #define EVENT_INTERVAL 1000 138 #define NOP_INTERVAL 5000 139 #define MAX_NOP_FAILURES 3 140 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 141 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 142 143 /* this threshold is a trade-off knob to choose between 144 * the potential additional overhead of an extra GET_LBA_STATUS request 145 * vs. unnecessarily reading a lot of zero sectors over the wire. 146 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 147 * sectors we check the allocation status of the area covered by the 148 * request first if the allocationmap indicates that the area might be 149 * unallocated. */ 150 #define ISCSI_CHECKALLOC_THRES 64 151 152 #ifdef __linux__ 153 154 static void 155 iscsi_bh_cb(void *p) 156 { 157 IscsiAIOCB *acb = p; 158 159 qemu_bh_delete(acb->bh); 160 161 acb->common.cb(acb->common.opaque, acb->status); 162 163 if (acb->task != NULL) { 164 scsi_free_scsi_task(acb->task); 165 acb->task = NULL; 166 } 167 168 qemu_aio_unref(acb); 169 } 170 171 static void 172 iscsi_schedule_bh(IscsiAIOCB *acb) 173 { 174 if (acb->bh) { 175 return; 176 } 177 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 178 qemu_bh_schedule(acb->bh); 179 } 180 181 #endif 182 183 static void iscsi_co_generic_bh_cb(void *opaque) 184 { 185 struct IscsiTask *iTask = opaque; 186 187 iTask->complete = 1; 188 aio_co_wake(iTask->co); 189 } 190 191 static void iscsi_retry_timer_expired(void *opaque) 192 { 193 struct IscsiTask *iTask = opaque; 194 iTask->complete = 1; 195 if (iTask->co) { 196 aio_co_wake(iTask->co); 197 } 198 } 199 200 static inline unsigned exp_random(double mean) 201 { 202 return -mean * log((double)rand() / RAND_MAX); 203 } 204 205 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 206 * libiscsi 1.10.0, together with other constants we need. Use it as 207 * a hint that we have to define them ourselves if needed, to keep the 208 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 209 * the test because SCSI_STATUS_* is an enum. 210 * 211 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 212 * an enum, check against the LIBISCSI_API_VERSION macro, which was 213 * introduced in 1.11.0. If it is present, there is no need to define 214 * anything. 215 */ 216 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 217 !defined(LIBISCSI_API_VERSION) 218 #define SCSI_STATUS_TASK_SET_FULL 0x28 219 #define SCSI_STATUS_TIMEOUT 0x0f000002 220 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 221 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 222 #endif 223 224 #ifndef LIBISCSI_API_VERSION 225 #define LIBISCSI_API_VERSION 20130701 226 #endif 227 228 static int iscsi_translate_sense(struct scsi_sense *sense) 229 { 230 return scsi_sense_to_errno(sense->key, 231 (sense->ascq & 0xFF00) >> 8, 232 sense->ascq & 0xFF); 233 } 234 235 /* Called (via iscsi_service) with QemuMutex held. */ 236 static void 237 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 238 void *command_data, void *opaque) 239 { 240 struct IscsiTask *iTask = opaque; 241 struct scsi_task *task = command_data; 242 243 iTask->status = status; 244 iTask->do_retry = 0; 245 iTask->err_code = 0; 246 iTask->task = task; 247 248 if (status != SCSI_STATUS_GOOD) { 249 iTask->err_code = -EIO; 250 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 251 if (status == SCSI_STATUS_BUSY || 252 status == SCSI_STATUS_TIMEOUT || 253 status == SCSI_STATUS_TASK_SET_FULL) { 254 unsigned retry_time = 255 exp_random(iscsi_retry_times[iTask->retries - 1]); 256 if (status == SCSI_STATUS_TIMEOUT) { 257 /* make sure the request is rescheduled AFTER the 258 * reconnect is initiated */ 259 retry_time = EVENT_INTERVAL * 2; 260 iTask->iscsilun->request_timed_out = true; 261 } 262 error_report("iSCSI Busy/TaskSetFull/TimeOut" 263 " (retry #%u in %u ms): %s", 264 iTask->retries, retry_time, 265 iscsi_get_error(iscsi)); 266 aio_timer_init(iTask->iscsilun->aio_context, 267 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 268 SCALE_MS, iscsi_retry_timer_expired, iTask); 269 timer_mod(&iTask->retry_timer, 270 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 271 iTask->do_retry = 1; 272 return; 273 } else if (status == SCSI_STATUS_CHECK_CONDITION) { 274 int error = iscsi_translate_sense(&task->sense); 275 if (error == EAGAIN) { 276 error_report("iSCSI CheckCondition: %s", 277 iscsi_get_error(iscsi)); 278 iTask->do_retry = 1; 279 } else { 280 iTask->err_code = -error; 281 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 282 } 283 } 284 } 285 } 286 287 if (iTask->co) { 288 replay_bh_schedule_oneshot_event(iTask->iscsilun->aio_context, 289 iscsi_co_generic_bh_cb, iTask); 290 } else { 291 iTask->complete = 1; 292 } 293 } 294 295 static void coroutine_fn 296 iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 297 { 298 *iTask = (struct IscsiTask) { 299 .co = qemu_coroutine_self(), 300 .iscsilun = iscsilun, 301 }; 302 } 303 304 #ifdef __linux__ 305 306 /* Called (via iscsi_service) with QemuMutex held. */ 307 static void 308 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 309 void *private_data) 310 { 311 IscsiAIOCB *acb = private_data; 312 313 /* If the command callback hasn't been called yet, drop the task */ 314 if (!acb->bh) { 315 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 316 iscsi_scsi_cancel_task(iscsi, acb->task); 317 } 318 319 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 320 } 321 322 static void 323 iscsi_aio_cancel(BlockAIOCB *blockacb) 324 { 325 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 326 IscsiLun *iscsilun = acb->iscsilun; 327 328 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) { 329 330 /* If it was cancelled or completed already, our work is done here */ 331 if (acb->cancelled || acb->status != -EINPROGRESS) { 332 return; 333 } 334 335 acb->cancelled = true; 336 337 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 338 339 /* send a task mgmt call to the target to cancel the task on the target */ 340 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 341 iscsi_abort_task_cb, acb) < 0) { 342 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 343 } 344 } 345 } 346 347 static const AIOCBInfo iscsi_aiocb_info = { 348 .aiocb_size = sizeof(IscsiAIOCB), 349 .cancel_async = iscsi_aio_cancel, 350 }; 351 352 #endif 353 354 static void iscsi_process_read(void *arg); 355 static void iscsi_process_write(void *arg); 356 357 /* Called with QemuMutex held. */ 358 static void 359 iscsi_set_events(IscsiLun *iscsilun) 360 { 361 struct iscsi_context *iscsi = iscsilun->iscsi; 362 int ev = iscsi_which_events(iscsi); 363 364 if (ev != iscsilun->events) { 365 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 366 (ev & POLLIN) ? iscsi_process_read : NULL, 367 (ev & POLLOUT) ? iscsi_process_write : NULL, 368 NULL, NULL, 369 iscsilun); 370 iscsilun->events = ev; 371 } 372 } 373 374 static void iscsi_timed_check_events(void *opaque) 375 { 376 IscsiLun *iscsilun = opaque; 377 378 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) { 379 /* check for timed out requests */ 380 iscsi_service(iscsilun->iscsi, 0); 381 382 if (iscsilun->request_timed_out) { 383 iscsilun->request_timed_out = false; 384 iscsi_reconnect(iscsilun->iscsi); 385 } 386 387 /* 388 * newer versions of libiscsi may return zero events. Ensure we are 389 * able to return to service once this situation changes. 390 */ 391 iscsi_set_events(iscsilun); 392 } 393 394 timer_mod(iscsilun->event_timer, 395 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 396 } 397 398 static void 399 iscsi_process_read(void *arg) 400 { 401 IscsiLun *iscsilun = arg; 402 struct iscsi_context *iscsi = iscsilun->iscsi; 403 404 qemu_mutex_lock(&iscsilun->mutex); 405 iscsi_service(iscsi, POLLIN); 406 iscsi_set_events(iscsilun); 407 qemu_mutex_unlock(&iscsilun->mutex); 408 } 409 410 static void 411 iscsi_process_write(void *arg) 412 { 413 IscsiLun *iscsilun = arg; 414 struct iscsi_context *iscsi = iscsilun->iscsi; 415 416 qemu_mutex_lock(&iscsilun->mutex); 417 iscsi_service(iscsi, POLLOUT); 418 iscsi_set_events(iscsilun); 419 qemu_mutex_unlock(&iscsilun->mutex); 420 } 421 422 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 423 { 424 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 425 } 426 427 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 428 { 429 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 430 } 431 432 static bool is_byte_request_lun_aligned(int64_t offset, int64_t bytes, 433 IscsiLun *iscsilun) 434 { 435 if (offset % iscsilun->block_size || bytes % iscsilun->block_size) { 436 error_report("iSCSI misaligned request: " 437 "iscsilun->block_size %u, offset %" PRIi64 438 ", bytes %" PRIi64, 439 iscsilun->block_size, offset, bytes); 440 return false; 441 } 442 return true; 443 } 444 445 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 446 IscsiLun *iscsilun) 447 { 448 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 449 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 450 nb_sectors << BDRV_SECTOR_BITS, 451 iscsilun); 452 } 453 454 static void iscsi_allocmap_free(IscsiLun *iscsilun) 455 { 456 g_free(iscsilun->allocmap); 457 g_free(iscsilun->allocmap_valid); 458 iscsilun->allocmap = NULL; 459 iscsilun->allocmap_valid = NULL; 460 } 461 462 463 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 464 { 465 iscsi_allocmap_free(iscsilun); 466 467 assert(iscsilun->cluster_size); 468 iscsilun->allocmap_size = 469 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 470 iscsilun->cluster_size); 471 472 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 473 if (!iscsilun->allocmap) { 474 return -ENOMEM; 475 } 476 477 if (open_flags & BDRV_O_NOCACHE) { 478 /* when cache.direct = on all allocmap entries are 479 * treated as invalid to force a relookup of the block 480 * status on every read request */ 481 return 0; 482 } 483 484 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 485 if (!iscsilun->allocmap_valid) { 486 /* if we are under memory pressure free the allocmap as well */ 487 iscsi_allocmap_free(iscsilun); 488 return -ENOMEM; 489 } 490 491 return 0; 492 } 493 494 static void 495 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 496 int64_t bytes, bool allocated, bool valid) 497 { 498 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 499 500 if (iscsilun->allocmap == NULL) { 501 return; 502 } 503 /* expand to entirely contain all affected clusters */ 504 assert(iscsilun->cluster_size); 505 cl_num_expanded = offset / iscsilun->cluster_size; 506 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 507 iscsilun->cluster_size) - cl_num_expanded; 508 /* shrink to touch only completely contained clusters */ 509 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 510 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 511 if (allocated) { 512 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 513 } else { 514 if (nb_cls_shrunk > 0) { 515 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 516 } 517 } 518 519 if (iscsilun->allocmap_valid == NULL) { 520 return; 521 } 522 if (valid) { 523 if (nb_cls_shrunk > 0) { 524 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 525 } 526 } else { 527 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 528 nb_cls_expanded); 529 } 530 } 531 532 static void 533 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 534 int64_t bytes) 535 { 536 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 537 } 538 539 static void 540 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 541 int64_t bytes) 542 { 543 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 544 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 545 */ 546 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 547 } 548 549 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 550 int64_t bytes) 551 { 552 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 553 } 554 555 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 556 { 557 if (iscsilun->allocmap) { 558 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 559 } 560 if (iscsilun->allocmap_valid) { 561 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 562 } 563 } 564 565 static inline bool 566 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 567 int64_t bytes) 568 { 569 unsigned long size; 570 if (iscsilun->allocmap == NULL) { 571 return true; 572 } 573 assert(iscsilun->cluster_size); 574 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 575 return !(find_next_bit(iscsilun->allocmap, size, 576 offset / iscsilun->cluster_size) == size); 577 } 578 579 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 580 int64_t offset, int64_t bytes) 581 { 582 unsigned long size; 583 if (iscsilun->allocmap_valid == NULL) { 584 return false; 585 } 586 assert(iscsilun->cluster_size); 587 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 588 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 589 offset / iscsilun->cluster_size) == size); 590 } 591 592 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 593 IscsiLun *iscsilun) 594 { 595 while (!iTask->complete) { 596 iscsi_set_events(iscsilun); 597 qemu_mutex_unlock(&iscsilun->mutex); 598 qemu_coroutine_yield(); 599 qemu_mutex_lock(&iscsilun->mutex); 600 } 601 } 602 603 static int coroutine_fn 604 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 605 QEMUIOVector *iov, int flags) 606 { 607 IscsiLun *iscsilun = bs->opaque; 608 struct IscsiTask iTask; 609 uint64_t lba; 610 uint32_t num_sectors; 611 bool fua = flags & BDRV_REQ_FUA; 612 int r = 0; 613 614 if (fua) { 615 assert(iscsilun->dpofua); 616 } 617 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 618 return -EINVAL; 619 } 620 621 if (bs->bl.max_transfer) { 622 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 623 } 624 625 lba = sector_qemu2lun(sector_num, iscsilun); 626 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 627 iscsi_co_init_iscsitask(iscsilun, &iTask); 628 qemu_mutex_lock(&iscsilun->mutex); 629 retry: 630 if (iscsilun->use_16_for_rw) { 631 #if LIBISCSI_API_VERSION >= (20160603) 632 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 633 NULL, num_sectors * iscsilun->block_size, 634 iscsilun->block_size, 0, 0, fua, 0, 0, 635 iscsi_co_generic_cb, &iTask, 636 (struct scsi_iovec *)iov->iov, iov->niov); 637 } else { 638 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 639 NULL, num_sectors * iscsilun->block_size, 640 iscsilun->block_size, 0, 0, fua, 0, 0, 641 iscsi_co_generic_cb, &iTask, 642 (struct scsi_iovec *)iov->iov, iov->niov); 643 } 644 #else 645 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 646 NULL, num_sectors * iscsilun->block_size, 647 iscsilun->block_size, 0, 0, fua, 0, 0, 648 iscsi_co_generic_cb, &iTask); 649 } else { 650 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 651 NULL, num_sectors * iscsilun->block_size, 652 iscsilun->block_size, 0, 0, fua, 0, 0, 653 iscsi_co_generic_cb, &iTask); 654 } 655 #endif 656 if (iTask.task == NULL) { 657 qemu_mutex_unlock(&iscsilun->mutex); 658 return -ENOMEM; 659 } 660 #if LIBISCSI_API_VERSION < (20160603) 661 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 662 iov->niov); 663 #endif 664 iscsi_co_wait_for_task(&iTask, iscsilun); 665 666 if (iTask.task != NULL) { 667 scsi_free_scsi_task(iTask.task); 668 iTask.task = NULL; 669 } 670 671 if (iTask.do_retry) { 672 iTask.complete = 0; 673 goto retry; 674 } 675 676 if (iTask.status != SCSI_STATUS_GOOD) { 677 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 678 nb_sectors * BDRV_SECTOR_SIZE); 679 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 680 iTask.err_str); 681 r = iTask.err_code; 682 goto out_unlock; 683 } 684 685 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 686 nb_sectors * BDRV_SECTOR_SIZE); 687 688 out_unlock: 689 qemu_mutex_unlock(&iscsilun->mutex); 690 g_free(iTask.err_str); 691 return r; 692 } 693 694 695 696 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 697 bool want_zero, int64_t offset, 698 int64_t bytes, int64_t *pnum, 699 int64_t *map, 700 BlockDriverState **file) 701 { 702 IscsiLun *iscsilun = bs->opaque; 703 struct scsi_get_lba_status *lbas = NULL; 704 struct scsi_lba_status_descriptor *lbasd = NULL; 705 struct IscsiTask iTask; 706 uint64_t lba, max_bytes; 707 int ret; 708 709 iscsi_co_init_iscsitask(iscsilun, &iTask); 710 711 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 712 713 /* default to all sectors allocated */ 714 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 715 if (map) { 716 *map = offset; 717 } 718 *pnum = bytes; 719 720 /* LUN does not support logical block provisioning */ 721 if (!iscsilun->lbpme) { 722 goto out; 723 } 724 725 lba = offset / iscsilun->block_size; 726 max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size; 727 728 qemu_mutex_lock(&iscsilun->mutex); 729 retry: 730 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 731 lba, 8 + 16, iscsi_co_generic_cb, 732 &iTask) == NULL) { 733 ret = -ENOMEM; 734 goto out_unlock; 735 } 736 iscsi_co_wait_for_task(&iTask, iscsilun); 737 738 if (iTask.do_retry) { 739 if (iTask.task != NULL) { 740 scsi_free_scsi_task(iTask.task); 741 iTask.task = NULL; 742 } 743 iTask.complete = 0; 744 goto retry; 745 } 746 747 if (iTask.status != SCSI_STATUS_GOOD) { 748 /* in case the get_lba_status_callout fails (i.e. 749 * because the device is busy or the cmd is not 750 * supported) we pretend all blocks are allocated 751 * for backwards compatibility */ 752 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 753 lba, iTask.err_str); 754 goto out_unlock; 755 } 756 757 lbas = scsi_datain_unmarshall(iTask.task); 758 if (lbas == NULL || lbas->num_descriptors == 0) { 759 ret = -EIO; 760 goto out_unlock; 761 } 762 763 lbasd = &lbas->descriptors[0]; 764 765 if (lba != lbasd->lba) { 766 ret = -EIO; 767 goto out_unlock; 768 } 769 770 *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes); 771 772 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 773 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 774 ret &= ~BDRV_BLOCK_DATA; 775 if (iscsilun->lbprz) { 776 ret |= BDRV_BLOCK_ZERO; 777 } 778 } 779 780 if (ret & BDRV_BLOCK_ZERO) { 781 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 782 } else { 783 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 784 } 785 786 out_unlock: 787 qemu_mutex_unlock(&iscsilun->mutex); 788 g_free(iTask.err_str); 789 out: 790 if (iTask.task != NULL) { 791 scsi_free_scsi_task(iTask.task); 792 } 793 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 794 *file = bs; 795 } 796 return ret; 797 } 798 799 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 800 int64_t sector_num, int nb_sectors, 801 QEMUIOVector *iov) 802 { 803 IscsiLun *iscsilun = bs->opaque; 804 struct IscsiTask iTask; 805 uint64_t lba; 806 uint32_t num_sectors; 807 int r = 0; 808 809 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 810 return -EINVAL; 811 } 812 813 if (bs->bl.max_transfer) { 814 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 815 } 816 817 /* if cache.direct is off and we have a valid entry in our allocation map 818 * we can skip checking the block status and directly return zeroes if 819 * the request falls within an unallocated area */ 820 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 821 nb_sectors * BDRV_SECTOR_SIZE) && 822 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 823 nb_sectors * BDRV_SECTOR_SIZE)) { 824 qemu_iovec_memset(iov, 0, 0x00, iov->size); 825 return 0; 826 } 827 828 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 829 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 830 nb_sectors * BDRV_SECTOR_SIZE) && 831 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 832 nb_sectors * BDRV_SECTOR_SIZE)) { 833 int64_t pnum; 834 /* check the block status from the beginning of the cluster 835 * containing the start sector */ 836 int64_t head; 837 int ret; 838 839 assert(iscsilun->cluster_size); 840 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 841 ret = iscsi_co_block_status(bs, true, 842 sector_num * BDRV_SECTOR_SIZE - head, 843 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 844 if (ret < 0) { 845 return ret; 846 } 847 /* if the whole request falls into an unallocated area we can avoid 848 * reading and directly return zeroes instead */ 849 if (ret & BDRV_BLOCK_ZERO && 850 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 851 qemu_iovec_memset(iov, 0, 0x00, iov->size); 852 return 0; 853 } 854 } 855 856 lba = sector_qemu2lun(sector_num, iscsilun); 857 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 858 859 iscsi_co_init_iscsitask(iscsilun, &iTask); 860 qemu_mutex_lock(&iscsilun->mutex); 861 retry: 862 if (iscsilun->use_16_for_rw) { 863 #if LIBISCSI_API_VERSION >= (20160603) 864 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 865 num_sectors * iscsilun->block_size, 866 iscsilun->block_size, 0, 0, 0, 0, 0, 867 iscsi_co_generic_cb, &iTask, 868 (struct scsi_iovec *)iov->iov, iov->niov); 869 } else { 870 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 871 num_sectors * iscsilun->block_size, 872 iscsilun->block_size, 873 0, 0, 0, 0, 0, 874 iscsi_co_generic_cb, &iTask, 875 (struct scsi_iovec *)iov->iov, iov->niov); 876 } 877 #else 878 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 879 num_sectors * iscsilun->block_size, 880 iscsilun->block_size, 0, 0, 0, 0, 0, 881 iscsi_co_generic_cb, &iTask); 882 } else { 883 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 884 num_sectors * iscsilun->block_size, 885 iscsilun->block_size, 886 0, 0, 0, 0, 0, 887 iscsi_co_generic_cb, &iTask); 888 } 889 #endif 890 if (iTask.task == NULL) { 891 qemu_mutex_unlock(&iscsilun->mutex); 892 return -ENOMEM; 893 } 894 #if LIBISCSI_API_VERSION < (20160603) 895 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 896 #endif 897 898 iscsi_co_wait_for_task(&iTask, iscsilun); 899 if (iTask.task != NULL) { 900 scsi_free_scsi_task(iTask.task); 901 iTask.task = NULL; 902 } 903 904 if (iTask.do_retry) { 905 iTask.complete = 0; 906 goto retry; 907 } 908 909 if (iTask.status != SCSI_STATUS_GOOD) { 910 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 911 lba, iTask.err_str); 912 r = iTask.err_code; 913 } 914 915 qemu_mutex_unlock(&iscsilun->mutex); 916 g_free(iTask.err_str); 917 return r; 918 } 919 920 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 921 { 922 IscsiLun *iscsilun = bs->opaque; 923 struct IscsiTask iTask; 924 int r = 0; 925 926 iscsi_co_init_iscsitask(iscsilun, &iTask); 927 qemu_mutex_lock(&iscsilun->mutex); 928 retry: 929 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 930 0, iscsi_co_generic_cb, &iTask) == NULL) { 931 qemu_mutex_unlock(&iscsilun->mutex); 932 return -ENOMEM; 933 } 934 935 iscsi_co_wait_for_task(&iTask, iscsilun); 936 937 if (iTask.task != NULL) { 938 scsi_free_scsi_task(iTask.task); 939 iTask.task = NULL; 940 } 941 942 if (iTask.do_retry) { 943 iTask.complete = 0; 944 goto retry; 945 } 946 947 if (iTask.status != SCSI_STATUS_GOOD) { 948 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 949 r = iTask.err_code; 950 } 951 952 qemu_mutex_unlock(&iscsilun->mutex); 953 g_free(iTask.err_str); 954 return r; 955 } 956 957 #ifdef __linux__ 958 /* Called (via iscsi_service) with QemuMutex held. */ 959 static void 960 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 961 void *command_data, void *opaque) 962 { 963 IscsiAIOCB *acb = opaque; 964 965 if (status == SCSI_STATUS_CANCELLED) { 966 if (!acb->bh) { 967 acb->status = -ECANCELED; 968 iscsi_schedule_bh(acb); 969 } 970 return; 971 } 972 973 acb->status = 0; 974 if (status < 0) { 975 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 976 iscsi_get_error(iscsi)); 977 acb->status = -iscsi_translate_sense(&acb->task->sense); 978 } 979 980 acb->ioh->driver_status = 0; 981 acb->ioh->host_status = 0; 982 acb->ioh->resid = 0; 983 acb->ioh->status = status; 984 985 #define SG_ERR_DRIVER_SENSE 0x08 986 987 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 988 int ss; 989 990 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 991 992 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 993 ss = MIN(acb->ioh->mx_sb_len, acb->ioh->sb_len_wr); 994 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 995 } 996 997 iscsi_schedule_bh(acb); 998 } 999 1000 static void iscsi_ioctl_bh_completion(void *opaque) 1001 { 1002 IscsiAIOCB *acb = opaque; 1003 1004 qemu_bh_delete(acb->bh); 1005 acb->common.cb(acb->common.opaque, acb->ret); 1006 qemu_aio_unref(acb); 1007 } 1008 1009 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 1010 { 1011 BlockDriverState *bs = acb->common.bs; 1012 IscsiLun *iscsilun = bs->opaque; 1013 int ret = 0; 1014 1015 switch (req) { 1016 case SG_GET_VERSION_NUM: 1017 *(int *)buf = 30000; 1018 break; 1019 case SG_GET_SCSI_ID: 1020 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 1021 break; 1022 default: 1023 ret = -EINVAL; 1024 } 1025 assert(!acb->bh); 1026 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 1027 iscsi_ioctl_bh_completion, acb); 1028 acb->ret = ret; 1029 qemu_bh_schedule(acb->bh); 1030 } 1031 1032 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1033 unsigned long int req, void *buf, 1034 BlockCompletionFunc *cb, void *opaque) 1035 { 1036 IscsiLun *iscsilun = bs->opaque; 1037 struct iscsi_context *iscsi = iscsilun->iscsi; 1038 struct iscsi_data data; 1039 IscsiAIOCB *acb; 1040 1041 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1042 1043 acb->iscsilun = iscsilun; 1044 acb->bh = NULL; 1045 acb->status = -EINPROGRESS; 1046 acb->ioh = buf; 1047 acb->cancelled = false; 1048 1049 if (req != SG_IO) { 1050 iscsi_ioctl_handle_emulated(acb, req, buf); 1051 return &acb->common; 1052 } 1053 1054 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1055 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1056 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1057 qemu_aio_unref(acb); 1058 return NULL; 1059 } 1060 1061 acb->task = malloc(sizeof(struct scsi_task)); 1062 if (acb->task == NULL) { 1063 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1064 iscsi_get_error(iscsi)); 1065 qemu_aio_unref(acb); 1066 return NULL; 1067 } 1068 memset(acb->task, 0, sizeof(struct scsi_task)); 1069 1070 switch (acb->ioh->dxfer_direction) { 1071 case SG_DXFER_TO_DEV: 1072 acb->task->xfer_dir = SCSI_XFER_WRITE; 1073 break; 1074 case SG_DXFER_FROM_DEV: 1075 acb->task->xfer_dir = SCSI_XFER_READ; 1076 break; 1077 default: 1078 acb->task->xfer_dir = SCSI_XFER_NONE; 1079 break; 1080 } 1081 1082 acb->task->cdb_size = acb->ioh->cmd_len; 1083 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1084 acb->task->expxferlen = acb->ioh->dxfer_len; 1085 1086 data.size = 0; 1087 qemu_mutex_lock(&iscsilun->mutex); 1088 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1089 if (acb->ioh->iovec_count == 0) { 1090 data.data = acb->ioh->dxferp; 1091 data.size = acb->ioh->dxfer_len; 1092 } else { 1093 scsi_task_set_iov_out(acb->task, 1094 (struct scsi_iovec *) acb->ioh->dxferp, 1095 acb->ioh->iovec_count); 1096 } 1097 } 1098 1099 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1100 iscsi_aio_ioctl_cb, 1101 (data.size > 0) ? &data : NULL, 1102 acb) != 0) { 1103 qemu_mutex_unlock(&iscsilun->mutex); 1104 scsi_free_scsi_task(acb->task); 1105 qemu_aio_unref(acb); 1106 return NULL; 1107 } 1108 1109 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1110 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1111 if (acb->ioh->iovec_count == 0) { 1112 scsi_task_add_data_in_buffer(acb->task, 1113 acb->ioh->dxfer_len, 1114 acb->ioh->dxferp); 1115 } else { 1116 scsi_task_set_iov_in(acb->task, 1117 (struct scsi_iovec *) acb->ioh->dxferp, 1118 acb->ioh->iovec_count); 1119 } 1120 } 1121 1122 iscsi_set_events(iscsilun); 1123 qemu_mutex_unlock(&iscsilun->mutex); 1124 1125 return &acb->common; 1126 } 1127 1128 #endif 1129 1130 static int64_t coroutine_fn 1131 iscsi_co_getlength(BlockDriverState *bs) 1132 { 1133 IscsiLun *iscsilun = bs->opaque; 1134 int64_t len; 1135 1136 len = iscsilun->num_blocks; 1137 len *= iscsilun->block_size; 1138 1139 return len; 1140 } 1141 1142 static int 1143 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, 1144 int64_t bytes) 1145 { 1146 IscsiLun *iscsilun = bs->opaque; 1147 struct IscsiTask iTask; 1148 struct unmap_list list; 1149 int r = 0; 1150 1151 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1152 return -ENOTSUP; 1153 } 1154 1155 if (!iscsilun->lbp.lbpu) { 1156 /* UNMAP is not supported by the target */ 1157 return 0; 1158 } 1159 1160 /* 1161 * We don't want to overflow list.num which is uint32_t. 1162 * We rely on our max_pdiscard. 1163 */ 1164 assert(bytes / iscsilun->block_size <= UINT32_MAX); 1165 1166 list.lba = offset / iscsilun->block_size; 1167 list.num = bytes / iscsilun->block_size; 1168 1169 iscsi_co_init_iscsitask(iscsilun, &iTask); 1170 qemu_mutex_lock(&iscsilun->mutex); 1171 retry: 1172 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1173 iscsi_co_generic_cb, &iTask) == NULL) { 1174 r = -ENOMEM; 1175 goto out_unlock; 1176 } 1177 1178 iscsi_co_wait_for_task(&iTask, iscsilun); 1179 1180 if (iTask.task != NULL) { 1181 scsi_free_scsi_task(iTask.task); 1182 iTask.task = NULL; 1183 } 1184 1185 if (iTask.do_retry) { 1186 iTask.complete = 0; 1187 goto retry; 1188 } 1189 1190 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1191 1192 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1193 /* the target might fail with a check condition if it 1194 is not happy with the alignment of the UNMAP request 1195 we silently fail in this case */ 1196 goto out_unlock; 1197 } 1198 1199 if (iTask.status != SCSI_STATUS_GOOD) { 1200 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1201 list.lba, iTask.err_str); 1202 r = iTask.err_code; 1203 goto out_unlock; 1204 } 1205 1206 out_unlock: 1207 qemu_mutex_unlock(&iscsilun->mutex); 1208 g_free(iTask.err_str); 1209 return r; 1210 } 1211 1212 static int 1213 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1214 int64_t bytes, BdrvRequestFlags flags) 1215 { 1216 IscsiLun *iscsilun = bs->opaque; 1217 struct IscsiTask iTask; 1218 uint64_t lba; 1219 uint64_t nb_blocks; 1220 bool use_16_for_ws = iscsilun->use_16_for_rw; 1221 int r = 0; 1222 1223 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1224 return -ENOTSUP; 1225 } 1226 1227 if (flags & BDRV_REQ_MAY_UNMAP) { 1228 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1229 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1230 use_16_for_ws = true; 1231 } 1232 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1233 /* WRITESAME16 with UNMAP is not supported by the target, 1234 * fall back and try WRITESAME10/16 without UNMAP */ 1235 flags &= ~BDRV_REQ_MAY_UNMAP; 1236 use_16_for_ws = iscsilun->use_16_for_rw; 1237 } 1238 } 1239 1240 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1241 /* WRITESAME without UNMAP is not supported by the target */ 1242 return -ENOTSUP; 1243 } 1244 1245 lba = offset / iscsilun->block_size; 1246 nb_blocks = bytes / iscsilun->block_size; 1247 1248 if (iscsilun->zeroblock == NULL) { 1249 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1250 if (iscsilun->zeroblock == NULL) { 1251 return -ENOMEM; 1252 } 1253 } 1254 1255 qemu_mutex_lock(&iscsilun->mutex); 1256 iscsi_co_init_iscsitask(iscsilun, &iTask); 1257 retry: 1258 if (use_16_for_ws) { 1259 /* 1260 * iscsi_writesame16_task num_blocks argument is uint32_t. We rely here 1261 * on our max_pwrite_zeroes limit. 1262 */ 1263 assert(nb_blocks <= UINT32_MAX); 1264 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1265 iscsilun->zeroblock, iscsilun->block_size, 1266 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1267 0, 0, iscsi_co_generic_cb, &iTask); 1268 } else { 1269 /* 1270 * iscsi_writesame10_task num_blocks argument is uint16_t. We rely here 1271 * on our max_pwrite_zeroes limit. 1272 */ 1273 assert(nb_blocks <= UINT16_MAX); 1274 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1275 iscsilun->zeroblock, iscsilun->block_size, 1276 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1277 0, 0, iscsi_co_generic_cb, &iTask); 1278 } 1279 if (iTask.task == NULL) { 1280 qemu_mutex_unlock(&iscsilun->mutex); 1281 return -ENOMEM; 1282 } 1283 1284 iscsi_co_wait_for_task(&iTask, iscsilun); 1285 1286 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1287 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1288 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1289 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1290 /* WRITE SAME is not supported by the target */ 1291 iscsilun->has_write_same = false; 1292 scsi_free_scsi_task(iTask.task); 1293 r = -ENOTSUP; 1294 goto out_unlock; 1295 } 1296 1297 if (iTask.task != NULL) { 1298 scsi_free_scsi_task(iTask.task); 1299 iTask.task = NULL; 1300 } 1301 1302 if (iTask.do_retry) { 1303 iTask.complete = 0; 1304 goto retry; 1305 } 1306 1307 if (iTask.status != SCSI_STATUS_GOOD) { 1308 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1309 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1310 lba, iTask.err_str); 1311 r = iTask.err_code; 1312 goto out_unlock; 1313 } 1314 1315 if (flags & BDRV_REQ_MAY_UNMAP) { 1316 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1317 } else { 1318 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1319 } 1320 1321 out_unlock: 1322 qemu_mutex_unlock(&iscsilun->mutex); 1323 g_free(iTask.err_str); 1324 return r; 1325 } 1326 1327 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1328 Error **errp) 1329 { 1330 const char *user = NULL; 1331 const char *password = NULL; 1332 const char *secretid; 1333 char *secret = NULL; 1334 1335 user = qemu_opt_get(opts, "user"); 1336 if (!user) { 1337 return; 1338 } 1339 1340 secretid = qemu_opt_get(opts, "password-secret"); 1341 password = qemu_opt_get(opts, "password"); 1342 if (secretid && password) { 1343 error_setg(errp, "'password' and 'password-secret' properties are " 1344 "mutually exclusive"); 1345 return; 1346 } 1347 if (secretid) { 1348 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1349 if (!secret) { 1350 return; 1351 } 1352 password = secret; 1353 } else if (!password) { 1354 error_setg(errp, "CHAP username specified but no password was given"); 1355 return; 1356 } else { 1357 warn_report("iSCSI block driver 'password' option is deprecated, " 1358 "use 'password-secret' instead"); 1359 } 1360 1361 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1362 error_setg(errp, "Failed to set initiator username and password"); 1363 } 1364 1365 g_free(secret); 1366 } 1367 1368 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1369 Error **errp) 1370 { 1371 const char *digest = NULL; 1372 1373 digest = qemu_opt_get(opts, "header-digest"); 1374 if (!digest) { 1375 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1376 } else if (!strcmp(digest, "crc32c")) { 1377 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1378 } else if (!strcmp(digest, "none")) { 1379 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1380 } else if (!strcmp(digest, "crc32c-none")) { 1381 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1382 } else if (!strcmp(digest, "none-crc32c")) { 1383 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1384 } else { 1385 error_setg(errp, "Invalid header-digest setting : %s", digest); 1386 } 1387 } 1388 1389 static char *get_initiator_name(QemuOpts *opts) 1390 { 1391 const char *name; 1392 char *iscsi_name; 1393 UuidInfo *uuid_info; 1394 1395 name = qemu_opt_get(opts, "initiator-name"); 1396 if (name) { 1397 return g_strdup(name); 1398 } 1399 1400 uuid_info = qmp_query_uuid(NULL); 1401 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1402 name = qemu_get_vm_name(); 1403 } else { 1404 name = uuid_info->UUID; 1405 } 1406 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1407 name ? ":" : "", name ? name : ""); 1408 qapi_free_UuidInfo(uuid_info); 1409 return iscsi_name; 1410 } 1411 1412 static void iscsi_nop_timed_event(void *opaque) 1413 { 1414 IscsiLun *iscsilun = opaque; 1415 1416 QEMU_LOCK_GUARD(&iscsilun->mutex); 1417 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1418 error_report("iSCSI: NOP timeout. Reconnecting..."); 1419 iscsilun->request_timed_out = true; 1420 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1421 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1422 return; 1423 } 1424 1425 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1426 iscsi_set_events(iscsilun); 1427 } 1428 1429 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1430 { 1431 struct scsi_task *task = NULL; 1432 struct scsi_readcapacity10 *rc10 = NULL; 1433 struct scsi_readcapacity16 *rc16 = NULL; 1434 int retries = ISCSI_CMD_RETRIES; 1435 1436 do { 1437 if (task != NULL) { 1438 scsi_free_scsi_task(task); 1439 task = NULL; 1440 } 1441 1442 switch (iscsilun->type) { 1443 case TYPE_DISK: 1444 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1445 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1446 rc16 = scsi_datain_unmarshall(task); 1447 if (rc16 == NULL) { 1448 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1449 } else { 1450 iscsilun->block_size = rc16->block_length; 1451 iscsilun->num_blocks = rc16->returned_lba + 1; 1452 iscsilun->lbpme = !!rc16->lbpme; 1453 iscsilun->lbprz = !!rc16->lbprz; 1454 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1455 } 1456 break; 1457 } 1458 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1459 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1460 break; 1461 } 1462 /* Fall through and try READ CAPACITY(10) instead. */ 1463 case TYPE_ROM: 1464 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1465 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1466 rc10 = scsi_datain_unmarshall(task); 1467 if (rc10 == NULL) { 1468 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1469 } else { 1470 iscsilun->block_size = rc10->block_size; 1471 if (rc10->lba == 0) { 1472 /* blank disk loaded */ 1473 iscsilun->num_blocks = 0; 1474 } else { 1475 iscsilun->num_blocks = rc10->lba + 1; 1476 } 1477 } 1478 } 1479 break; 1480 default: 1481 return; 1482 } 1483 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1484 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1485 && retries-- > 0); 1486 1487 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1488 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1489 } else if (!iscsilun->block_size || 1490 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1491 error_setg(errp, "iSCSI: the target returned an invalid " 1492 "block size of %d.", iscsilun->block_size); 1493 } 1494 if (task) { 1495 scsi_free_scsi_task(task); 1496 } 1497 } 1498 1499 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1500 int evpd, int pc, void **inq, Error **errp) 1501 { 1502 int full_size; 1503 struct scsi_task *task = NULL; 1504 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1505 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1506 goto fail; 1507 } 1508 full_size = scsi_datain_getfullsize(task); 1509 if (full_size > task->datain.size) { 1510 scsi_free_scsi_task(task); 1511 1512 /* we need more data for the full list */ 1513 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1514 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1515 goto fail; 1516 } 1517 } 1518 1519 *inq = scsi_datain_unmarshall(task); 1520 if (*inq == NULL) { 1521 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1522 goto fail_with_err; 1523 } 1524 1525 return task; 1526 1527 fail: 1528 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1529 iscsi_get_error(iscsi)); 1530 fail_with_err: 1531 if (task != NULL) { 1532 scsi_free_scsi_task(task); 1533 } 1534 return NULL; 1535 } 1536 1537 static void iscsi_detach_aio_context(BlockDriverState *bs) 1538 { 1539 IscsiLun *iscsilun = bs->opaque; 1540 1541 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1542 NULL, NULL, NULL, NULL, NULL); 1543 iscsilun->events = 0; 1544 1545 if (iscsilun->nop_timer) { 1546 timer_free(iscsilun->nop_timer); 1547 iscsilun->nop_timer = NULL; 1548 } 1549 if (iscsilun->event_timer) { 1550 timer_free(iscsilun->event_timer); 1551 iscsilun->event_timer = NULL; 1552 } 1553 } 1554 1555 static void iscsi_attach_aio_context(BlockDriverState *bs, 1556 AioContext *new_context) 1557 { 1558 IscsiLun *iscsilun = bs->opaque; 1559 1560 iscsilun->aio_context = new_context; 1561 iscsi_set_events(iscsilun); 1562 1563 /* Set up a timer for sending out iSCSI NOPs */ 1564 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1565 QEMU_CLOCK_REALTIME, SCALE_MS, 1566 iscsi_nop_timed_event, iscsilun); 1567 timer_mod(iscsilun->nop_timer, 1568 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1569 1570 /* Set up a timer for periodic calls to iscsi_set_events and to 1571 * scan for command timeout */ 1572 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1573 QEMU_CLOCK_REALTIME, SCALE_MS, 1574 iscsi_timed_check_events, iscsilun); 1575 timer_mod(iscsilun->event_timer, 1576 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1577 } 1578 1579 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1580 { 1581 struct scsi_task *task; 1582 struct scsi_mode_sense *ms = NULL; 1583 iscsilun->write_protected = false; 1584 iscsilun->dpofua = false; 1585 1586 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1587 1, SCSI_MODESENSE_PC_CURRENT, 1588 0x3F, 0, 255); 1589 if (task == NULL) { 1590 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1591 iscsi_get_error(iscsilun->iscsi)); 1592 goto out; 1593 } 1594 1595 if (task->status != SCSI_STATUS_GOOD) { 1596 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1597 goto out; 1598 } 1599 ms = scsi_datain_unmarshall(task); 1600 if (!ms) { 1601 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1602 iscsi_get_error(iscsilun->iscsi)); 1603 goto out; 1604 } 1605 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1606 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1607 1608 out: 1609 if (task) { 1610 scsi_free_scsi_task(task); 1611 } 1612 } 1613 1614 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1615 { 1616 QemuOptsList *list; 1617 QemuOpts *opts; 1618 const char *user, *password, *password_secret, *initiator_name, 1619 *header_digest, *timeout; 1620 1621 list = qemu_find_opts("iscsi"); 1622 if (!list) { 1623 return; 1624 } 1625 1626 opts = qemu_opts_find(list, target); 1627 if (opts == NULL) { 1628 opts = QTAILQ_FIRST(&list->head); 1629 if (!opts) { 1630 return; 1631 } 1632 } 1633 1634 user = qemu_opt_get(opts, "user"); 1635 if (user) { 1636 qdict_set_default_str(options, "user", user); 1637 } 1638 1639 password = qemu_opt_get(opts, "password"); 1640 if (password) { 1641 qdict_set_default_str(options, "password", password); 1642 } 1643 1644 password_secret = qemu_opt_get(opts, "password-secret"); 1645 if (password_secret) { 1646 qdict_set_default_str(options, "password-secret", password_secret); 1647 } 1648 1649 initiator_name = qemu_opt_get(opts, "initiator-name"); 1650 if (initiator_name) { 1651 qdict_set_default_str(options, "initiator-name", initiator_name); 1652 } 1653 1654 header_digest = qemu_opt_get(opts, "header-digest"); 1655 if (header_digest) { 1656 /* -iscsi takes upper case values, but QAPI only supports lower case 1657 * enum constant names, so we have to convert here. */ 1658 char *qapi_value = g_ascii_strdown(header_digest, -1); 1659 qdict_set_default_str(options, "header-digest", qapi_value); 1660 g_free(qapi_value); 1661 } 1662 1663 timeout = qemu_opt_get(opts, "timeout"); 1664 if (timeout) { 1665 qdict_set_default_str(options, "timeout", timeout); 1666 } 1667 } 1668 1669 /* 1670 * We support iscsi url's on the form 1671 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1672 */ 1673 static void iscsi_parse_filename(const char *filename, QDict *options, 1674 Error **errp) 1675 { 1676 struct iscsi_url *iscsi_url; 1677 const char *transport_name; 1678 char *lun_str; 1679 1680 iscsi_url = iscsi_parse_full_url(NULL, filename); 1681 if (iscsi_url == NULL) { 1682 error_setg(errp, "Failed to parse URL : %s", filename); 1683 return; 1684 } 1685 1686 #if LIBISCSI_API_VERSION >= (20160603) 1687 switch (iscsi_url->transport) { 1688 case TCP_TRANSPORT: 1689 transport_name = "tcp"; 1690 break; 1691 case ISER_TRANSPORT: 1692 transport_name = "iser"; 1693 break; 1694 default: 1695 error_setg(errp, "Unknown transport type (%d)", 1696 iscsi_url->transport); 1697 return; 1698 } 1699 #else 1700 transport_name = "tcp"; 1701 #endif 1702 1703 qdict_set_default_str(options, "transport", transport_name); 1704 qdict_set_default_str(options, "portal", iscsi_url->portal); 1705 qdict_set_default_str(options, "target", iscsi_url->target); 1706 1707 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1708 qdict_set_default_str(options, "lun", lun_str); 1709 g_free(lun_str); 1710 1711 /* User/password from -iscsi take precedence over those from the URL */ 1712 iscsi_parse_iscsi_option(iscsi_url->target, options); 1713 1714 if (iscsi_url->user[0] != '\0') { 1715 qdict_set_default_str(options, "user", iscsi_url->user); 1716 qdict_set_default_str(options, "password", iscsi_url->passwd); 1717 } 1718 1719 iscsi_destroy_url(iscsi_url); 1720 } 1721 1722 static QemuOptsList runtime_opts = { 1723 .name = "iscsi", 1724 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1725 .desc = { 1726 { 1727 .name = "transport", 1728 .type = QEMU_OPT_STRING, 1729 }, 1730 { 1731 .name = "portal", 1732 .type = QEMU_OPT_STRING, 1733 }, 1734 { 1735 .name = "target", 1736 .type = QEMU_OPT_STRING, 1737 }, 1738 { 1739 .name = "user", 1740 .type = QEMU_OPT_STRING, 1741 }, 1742 { 1743 .name = "password", 1744 .type = QEMU_OPT_STRING, 1745 }, 1746 { 1747 .name = "password-secret", 1748 .type = QEMU_OPT_STRING, 1749 }, 1750 { 1751 .name = "lun", 1752 .type = QEMU_OPT_NUMBER, 1753 }, 1754 { 1755 .name = "initiator-name", 1756 .type = QEMU_OPT_STRING, 1757 }, 1758 { 1759 .name = "header-digest", 1760 .type = QEMU_OPT_STRING, 1761 }, 1762 { 1763 .name = "timeout", 1764 .type = QEMU_OPT_NUMBER, 1765 }, 1766 { /* end of list */ } 1767 }, 1768 }; 1769 1770 static void iscsi_save_designator(IscsiLun *lun, 1771 struct scsi_inquiry_device_identification *inq_di) 1772 { 1773 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1774 1775 for (desig = inq_di->designators; desig; desig = desig->next) { 1776 if (desig->association || 1777 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1778 continue; 1779 } 1780 /* NAA works better than T10 vendor ID based designator. */ 1781 if (!copy || copy->designator_type < desig->designator_type) { 1782 copy = desig; 1783 } 1784 } 1785 if (copy) { 1786 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1787 *lun->dd = *copy; 1788 lun->dd->next = NULL; 1789 lun->dd->designator = g_malloc(copy->designator_length); 1790 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1791 } 1792 } 1793 1794 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1795 Error **errp) 1796 { 1797 IscsiLun *iscsilun = bs->opaque; 1798 struct iscsi_context *iscsi = NULL; 1799 struct scsi_task *task = NULL; 1800 struct scsi_inquiry_standard *inq = NULL; 1801 struct scsi_inquiry_supported_pages *inq_vpd; 1802 char *initiator_name = NULL; 1803 QemuOpts *opts; 1804 Error *local_err = NULL; 1805 const char *transport_name, *portal, *target; 1806 #if LIBISCSI_API_VERSION >= (20160603) 1807 enum iscsi_transport_type transport; 1808 #endif 1809 int i, ret = 0, timeout = 0, lun; 1810 1811 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1812 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 1813 ret = -EINVAL; 1814 goto out; 1815 } 1816 1817 transport_name = qemu_opt_get(opts, "transport"); 1818 portal = qemu_opt_get(opts, "portal"); 1819 target = qemu_opt_get(opts, "target"); 1820 lun = qemu_opt_get_number(opts, "lun", 0); 1821 1822 if (!transport_name || !portal || !target) { 1823 error_setg(errp, "Need all of transport, portal and target options"); 1824 ret = -EINVAL; 1825 goto out; 1826 } 1827 1828 if (!strcmp(transport_name, "tcp")) { 1829 #if LIBISCSI_API_VERSION >= (20160603) 1830 transport = TCP_TRANSPORT; 1831 } else if (!strcmp(transport_name, "iser")) { 1832 transport = ISER_TRANSPORT; 1833 #else 1834 /* TCP is what older libiscsi versions always use */ 1835 #endif 1836 } else { 1837 error_setg(errp, "Unknown transport: %s", transport_name); 1838 ret = -EINVAL; 1839 goto out; 1840 } 1841 1842 memset(iscsilun, 0, sizeof(IscsiLun)); 1843 1844 initiator_name = get_initiator_name(opts); 1845 1846 iscsi = iscsi_create_context(initiator_name); 1847 if (iscsi == NULL) { 1848 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1849 ret = -ENOMEM; 1850 goto out; 1851 } 1852 #if LIBISCSI_API_VERSION >= (20160603) 1853 if (iscsi_init_transport(iscsi, transport)) { 1854 error_setg(errp, ("Error initializing transport.")); 1855 ret = -EINVAL; 1856 goto out; 1857 } 1858 #endif 1859 if (iscsi_set_targetname(iscsi, target)) { 1860 error_setg(errp, "iSCSI: Failed to set target name."); 1861 ret = -EINVAL; 1862 goto out; 1863 } 1864 1865 /* check if we got CHAP username/password via the options */ 1866 apply_chap(iscsi, opts, &local_err); 1867 if (local_err != NULL) { 1868 error_propagate(errp, local_err); 1869 ret = -EINVAL; 1870 goto out; 1871 } 1872 1873 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1874 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1875 ret = -EINVAL; 1876 goto out; 1877 } 1878 1879 /* check if we got HEADER_DIGEST via the options */ 1880 apply_header_digest(iscsi, opts, &local_err); 1881 if (local_err != NULL) { 1882 error_propagate(errp, local_err); 1883 ret = -EINVAL; 1884 goto out; 1885 } 1886 1887 /* timeout handling is broken in libiscsi before 1.15.0 */ 1888 timeout = qemu_opt_get_number(opts, "timeout", 0); 1889 #if LIBISCSI_API_VERSION >= 20150621 1890 iscsi_set_timeout(iscsi, timeout); 1891 #else 1892 if (timeout) { 1893 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1894 } 1895 #endif 1896 1897 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1898 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1899 iscsi_get_error(iscsi)); 1900 ret = -EINVAL; 1901 goto out; 1902 } 1903 1904 iscsilun->iscsi = iscsi; 1905 iscsilun->aio_context = bdrv_get_aio_context(bs); 1906 iscsilun->lun = lun; 1907 iscsilun->has_write_same = true; 1908 1909 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1910 (void **) &inq, errp); 1911 if (task == NULL) { 1912 ret = -EINVAL; 1913 goto out; 1914 } 1915 iscsilun->type = inq->periperal_device_type; 1916 scsi_free_scsi_task(task); 1917 task = NULL; 1918 1919 iscsi_modesense_sync(iscsilun); 1920 if (iscsilun->dpofua) { 1921 bs->supported_write_flags = BDRV_REQ_FUA; 1922 } 1923 1924 /* Check the write protect flag of the LUN if we want to write */ 1925 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1926 iscsilun->write_protected) { 1927 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1928 if (ret < 0) { 1929 goto out; 1930 } 1931 flags &= ~BDRV_O_RDWR; 1932 } 1933 1934 iscsi_readcapacity_sync(iscsilun, &local_err); 1935 if (local_err != NULL) { 1936 error_propagate(errp, local_err); 1937 ret = -EINVAL; 1938 goto out; 1939 } 1940 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1941 1942 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1943 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1944 * will try to read from the device to guess the image format. 1945 */ 1946 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1947 bs->sg = true; 1948 } 1949 1950 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1951 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1952 (void **) &inq_vpd, errp); 1953 if (task == NULL) { 1954 ret = -EINVAL; 1955 goto out; 1956 } 1957 for (i = 0; i < inq_vpd->num_pages; i++) { 1958 struct scsi_task *inq_task; 1959 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1960 struct scsi_inquiry_block_limits *inq_bl; 1961 struct scsi_inquiry_device_identification *inq_di; 1962 switch (inq_vpd->pages[i]) { 1963 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1964 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1965 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1966 (void **) &inq_lbp, errp); 1967 if (inq_task == NULL) { 1968 ret = -EINVAL; 1969 goto out; 1970 } 1971 memcpy(&iscsilun->lbp, inq_lbp, 1972 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1973 scsi_free_scsi_task(inq_task); 1974 break; 1975 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1976 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1977 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1978 (void **) &inq_bl, errp); 1979 if (inq_task == NULL) { 1980 ret = -EINVAL; 1981 goto out; 1982 } 1983 memcpy(&iscsilun->bl, inq_bl, 1984 sizeof(struct scsi_inquiry_block_limits)); 1985 scsi_free_scsi_task(inq_task); 1986 break; 1987 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1988 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1989 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1990 (void **) &inq_di, errp); 1991 if (inq_task == NULL) { 1992 ret = -EINVAL; 1993 goto out; 1994 } 1995 iscsi_save_designator(iscsilun, inq_di); 1996 scsi_free_scsi_task(inq_task); 1997 break; 1998 default: 1999 break; 2000 } 2001 } 2002 scsi_free_scsi_task(task); 2003 task = NULL; 2004 2005 qemu_mutex_init(&iscsilun->mutex); 2006 iscsi_attach_aio_context(bs, iscsilun->aio_context); 2007 2008 /* Guess the internal cluster (page) size of the iscsi target by the means 2009 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 2010 * reasonable size */ 2011 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 2012 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 2013 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 2014 iscsilun->block_size; 2015 if (iscsilun->lbprz) { 2016 ret = iscsi_allocmap_init(iscsilun, flags); 2017 } 2018 } 2019 2020 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2021 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2022 } 2023 2024 out: 2025 qemu_opts_del(opts); 2026 g_free(initiator_name); 2027 if (task != NULL) { 2028 scsi_free_scsi_task(task); 2029 } 2030 2031 if (ret) { 2032 if (iscsi != NULL) { 2033 if (iscsi_is_logged_in(iscsi)) { 2034 iscsi_logout_sync(iscsi); 2035 } 2036 iscsi_destroy_context(iscsi); 2037 } 2038 memset(iscsilun, 0, sizeof(IscsiLun)); 2039 } 2040 2041 return ret; 2042 } 2043 2044 static void iscsi_close(BlockDriverState *bs) 2045 { 2046 IscsiLun *iscsilun = bs->opaque; 2047 struct iscsi_context *iscsi = iscsilun->iscsi; 2048 2049 iscsi_detach_aio_context(bs); 2050 if (iscsi_is_logged_in(iscsi)) { 2051 iscsi_logout_sync(iscsi); 2052 } 2053 iscsi_destroy_context(iscsi); 2054 if (iscsilun->dd) { 2055 g_free(iscsilun->dd->designator); 2056 g_free(iscsilun->dd); 2057 } 2058 g_free(iscsilun->zeroblock); 2059 iscsi_allocmap_free(iscsilun); 2060 qemu_mutex_destroy(&iscsilun->mutex); 2061 memset(iscsilun, 0, sizeof(IscsiLun)); 2062 } 2063 2064 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2065 { 2066 /* We don't actually refresh here, but just return data queried in 2067 * iscsi_open(): iscsi targets don't change their limits. */ 2068 2069 IscsiLun *iscsilun = bs->opaque; 2070 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2071 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2072 2073 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bdrv_is_sg(bs)); 2074 2075 bs->bl.request_alignment = block_size; 2076 2077 if (iscsilun->bl.max_xfer_len) { 2078 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2079 } 2080 2081 if (max_xfer_len * block_size < INT_MAX) { 2082 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2083 } 2084 2085 if (iscsilun->lbp.lbpu) { 2086 bs->bl.max_pdiscard = 2087 MIN_NON_ZERO(iscsilun->bl.max_unmap * iscsilun->block_size, 2088 (uint64_t)UINT32_MAX * iscsilun->block_size); 2089 bs->bl.pdiscard_alignment = 2090 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2091 } else { 2092 bs->bl.pdiscard_alignment = iscsilun->block_size; 2093 } 2094 2095 bs->bl.max_pwrite_zeroes = 2096 MIN_NON_ZERO(iscsilun->bl.max_ws_len * iscsilun->block_size, 2097 max_xfer_len * iscsilun->block_size); 2098 2099 if (iscsilun->lbp.lbpws) { 2100 bs->bl.pwrite_zeroes_alignment = 2101 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2102 } else { 2103 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2104 } 2105 if (iscsilun->bl.opt_xfer_len && 2106 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2107 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2108 iscsilun->block_size); 2109 } 2110 } 2111 2112 /* Note that this will not re-establish a connection with an iSCSI target - it 2113 * is effectively a NOP. */ 2114 static int iscsi_reopen_prepare(BDRVReopenState *state, 2115 BlockReopenQueue *queue, Error **errp) 2116 { 2117 IscsiLun *iscsilun = state->bs->opaque; 2118 2119 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2120 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2121 return -EACCES; 2122 } 2123 return 0; 2124 } 2125 2126 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2127 { 2128 IscsiLun *iscsilun = reopen_state->bs->opaque; 2129 2130 /* the cache.direct status might have changed */ 2131 if (iscsilun->allocmap != NULL) { 2132 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2133 } 2134 } 2135 2136 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2137 bool exact, PreallocMode prealloc, 2138 BdrvRequestFlags flags, Error **errp) 2139 { 2140 IscsiLun *iscsilun = bs->opaque; 2141 int64_t cur_length; 2142 Error *local_err = NULL; 2143 2144 if (prealloc != PREALLOC_MODE_OFF) { 2145 error_setg(errp, "Unsupported preallocation mode '%s'", 2146 PreallocMode_str(prealloc)); 2147 return -ENOTSUP; 2148 } 2149 2150 if (iscsilun->type != TYPE_DISK) { 2151 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2152 return -ENOTSUP; 2153 } 2154 2155 iscsi_readcapacity_sync(iscsilun, &local_err); 2156 if (local_err != NULL) { 2157 error_propagate(errp, local_err); 2158 return -EIO; 2159 } 2160 2161 cur_length = iscsi_co_getlength(bs); 2162 if (offset != cur_length && exact) { 2163 error_setg(errp, "Cannot resize iSCSI devices"); 2164 return -ENOTSUP; 2165 } else if (offset > cur_length) { 2166 error_setg(errp, "Cannot grow iSCSI devices"); 2167 return -EINVAL; 2168 } 2169 2170 if (iscsilun->allocmap != NULL) { 2171 iscsi_allocmap_init(iscsilun, bs->open_flags); 2172 } 2173 2174 return 0; 2175 } 2176 2177 static int coroutine_fn 2178 iscsi_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2179 { 2180 IscsiLun *iscsilun = bs->opaque; 2181 bdi->cluster_size = iscsilun->cluster_size; 2182 return 0; 2183 } 2184 2185 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2186 Error **errp) 2187 { 2188 IscsiLun *iscsilun = bs->opaque; 2189 iscsi_allocmap_invalidate(iscsilun); 2190 } 2191 2192 static int coroutine_fn GRAPH_RDLOCK 2193 iscsi_co_copy_range_from(BlockDriverState *bs, 2194 BdrvChild *src, int64_t src_offset, 2195 BdrvChild *dst, int64_t dst_offset, 2196 int64_t bytes, BdrvRequestFlags read_flags, 2197 BdrvRequestFlags write_flags) 2198 { 2199 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2200 read_flags, write_flags); 2201 } 2202 2203 static struct scsi_task *iscsi_xcopy_task(int param_len) 2204 { 2205 struct scsi_task *task; 2206 2207 task = g_new0(struct scsi_task, 1); 2208 2209 task->cdb[0] = EXTENDED_COPY; 2210 task->cdb[10] = (param_len >> 24) & 0xFF; 2211 task->cdb[11] = (param_len >> 16) & 0xFF; 2212 task->cdb[12] = (param_len >> 8) & 0xFF; 2213 task->cdb[13] = param_len & 0xFF; 2214 task->cdb_size = 16; 2215 task->xfer_dir = SCSI_XFER_WRITE; 2216 task->expxferlen = param_len; 2217 2218 return task; 2219 } 2220 2221 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2222 { 2223 struct scsi_inquiry_device_designator *dd = lun->dd; 2224 2225 memset(desc, 0, 32); 2226 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2227 desc[4] = dd->code_set; 2228 desc[5] = (dd->designator_type & 0xF) 2229 | ((dd->association & 3) << 4); 2230 desc[7] = dd->designator_length; 2231 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2232 2233 desc[28] = 0; 2234 desc[29] = (lun->block_size >> 16) & 0xFF; 2235 desc[30] = (lun->block_size >> 8) & 0xFF; 2236 desc[31] = lun->block_size & 0xFF; 2237 } 2238 2239 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2240 int dst_index) 2241 { 2242 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2243 hdr[1] = ((dc << 1) | cat) & 0xFF; 2244 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2245 /* don't account for the first 4 bytes in descriptor header*/ 2246 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2247 hdr[4] = (src_index >> 8) & 0xFF; 2248 hdr[5] = src_index & 0xFF; 2249 hdr[6] = (dst_index >> 8) & 0xFF; 2250 hdr[7] = dst_index & 0xFF; 2251 } 2252 2253 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2254 int src_index, int dst_index, int num_blks, 2255 uint64_t src_lba, uint64_t dst_lba) 2256 { 2257 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2258 2259 /* The caller should verify the request size */ 2260 assert(num_blks < 65536); 2261 desc[10] = (num_blks >> 8) & 0xFF; 2262 desc[11] = num_blks & 0xFF; 2263 desc[12] = (src_lba >> 56) & 0xFF; 2264 desc[13] = (src_lba >> 48) & 0xFF; 2265 desc[14] = (src_lba >> 40) & 0xFF; 2266 desc[15] = (src_lba >> 32) & 0xFF; 2267 desc[16] = (src_lba >> 24) & 0xFF; 2268 desc[17] = (src_lba >> 16) & 0xFF; 2269 desc[18] = (src_lba >> 8) & 0xFF; 2270 desc[19] = src_lba & 0xFF; 2271 desc[20] = (dst_lba >> 56) & 0xFF; 2272 desc[21] = (dst_lba >> 48) & 0xFF; 2273 desc[22] = (dst_lba >> 40) & 0xFF; 2274 desc[23] = (dst_lba >> 32) & 0xFF; 2275 desc[24] = (dst_lba >> 24) & 0xFF; 2276 desc[25] = (dst_lba >> 16) & 0xFF; 2277 desc[26] = (dst_lba >> 8) & 0xFF; 2278 desc[27] = dst_lba & 0xFF; 2279 } 2280 2281 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2282 int list_id_usage, int prio, 2283 int tgt_desc_len, 2284 int seg_desc_len, int inline_data_len) 2285 { 2286 buf[0] = list_id; 2287 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2288 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2289 buf[3] = tgt_desc_len & 0xFF; 2290 buf[8] = (seg_desc_len >> 24) & 0xFF; 2291 buf[9] = (seg_desc_len >> 16) & 0xFF; 2292 buf[10] = (seg_desc_len >> 8) & 0xFF; 2293 buf[11] = seg_desc_len & 0xFF; 2294 buf[12] = (inline_data_len >> 24) & 0xFF; 2295 buf[13] = (inline_data_len >> 16) & 0xFF; 2296 buf[14] = (inline_data_len >> 8) & 0xFF; 2297 buf[15] = inline_data_len & 0xFF; 2298 } 2299 2300 static void iscsi_xcopy_data(struct iscsi_data *data, 2301 IscsiLun *src, int64_t src_lba, 2302 IscsiLun *dst, int64_t dst_lba, 2303 uint16_t num_blocks) 2304 { 2305 uint8_t *buf; 2306 const int src_offset = XCOPY_DESC_OFFSET; 2307 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2308 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2309 2310 data->size = XCOPY_DESC_OFFSET + 2311 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2312 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2313 data->data = g_malloc0(data->size); 2314 buf = data->data; 2315 2316 /* Initialise the parameter list header */ 2317 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2318 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2319 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2320 0); 2321 2322 /* Initialise CSCD list with one src + one dst descriptor */ 2323 iscsi_populate_target_desc(&buf[src_offset], src); 2324 iscsi_populate_target_desc(&buf[dst_offset], dst); 2325 2326 /* Initialise one segment descriptor */ 2327 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2328 src_lba, dst_lba); 2329 } 2330 2331 static int coroutine_fn GRAPH_RDLOCK 2332 iscsi_co_copy_range_to(BlockDriverState *bs, 2333 BdrvChild *src, int64_t src_offset, 2334 BdrvChild *dst, int64_t dst_offset, 2335 int64_t bytes, BdrvRequestFlags read_flags, 2336 BdrvRequestFlags write_flags) 2337 { 2338 IscsiLun *dst_lun = dst->bs->opaque; 2339 IscsiLun *src_lun; 2340 struct IscsiTask iscsi_task; 2341 struct iscsi_data data; 2342 int r = 0; 2343 int block_size; 2344 2345 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2346 return -ENOTSUP; 2347 } 2348 src_lun = src->bs->opaque; 2349 2350 if (!src_lun->dd || !dst_lun->dd) { 2351 return -ENOTSUP; 2352 } 2353 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2354 return -ENOTSUP; 2355 } 2356 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2357 return -ENOTSUP; 2358 } 2359 if (dst_lun->block_size != src_lun->block_size || 2360 !dst_lun->block_size) { 2361 return -ENOTSUP; 2362 } 2363 2364 block_size = dst_lun->block_size; 2365 if (bytes / block_size > 65535) { 2366 return -ENOTSUP; 2367 } 2368 2369 iscsi_xcopy_data(&data, 2370 src_lun, src_offset / block_size, 2371 dst_lun, dst_offset / block_size, 2372 bytes / block_size); 2373 2374 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2375 2376 qemu_mutex_lock(&dst_lun->mutex); 2377 iscsi_task.task = iscsi_xcopy_task(data.size); 2378 retry: 2379 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2380 iscsi_task.task, iscsi_co_generic_cb, 2381 &data, 2382 &iscsi_task) != 0) { 2383 r = -EIO; 2384 goto out_unlock; 2385 } 2386 2387 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2388 2389 if (iscsi_task.do_retry) { 2390 iscsi_task.complete = 0; 2391 goto retry; 2392 } 2393 2394 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2395 r = iscsi_task.err_code; 2396 goto out_unlock; 2397 } 2398 2399 out_unlock: 2400 2401 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2402 g_free(iscsi_task.task); 2403 qemu_mutex_unlock(&dst_lun->mutex); 2404 g_free(iscsi_task.err_str); 2405 return r; 2406 } 2407 2408 2409 static const char *const iscsi_strong_runtime_opts[] = { 2410 "transport", 2411 "portal", 2412 "target", 2413 "user", 2414 "password", 2415 "password-secret", 2416 "lun", 2417 "initiator-name", 2418 "header-digest", 2419 2420 NULL 2421 }; 2422 2423 static BlockDriver bdrv_iscsi = { 2424 .format_name = "iscsi", 2425 .protocol_name = "iscsi", 2426 2427 .instance_size = sizeof(IscsiLun), 2428 .bdrv_parse_filename = iscsi_parse_filename, 2429 .bdrv_file_open = iscsi_open, 2430 .bdrv_close = iscsi_close, 2431 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 2432 .create_opts = &bdrv_create_opts_simple, 2433 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2434 .bdrv_reopen_commit = iscsi_reopen_commit, 2435 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2436 2437 .bdrv_co_getlength = iscsi_co_getlength, 2438 .bdrv_co_get_info = iscsi_co_get_info, 2439 .bdrv_co_truncate = iscsi_co_truncate, 2440 .bdrv_refresh_limits = iscsi_refresh_limits, 2441 2442 .bdrv_co_block_status = iscsi_co_block_status, 2443 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2444 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2445 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2446 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2447 .bdrv_co_readv = iscsi_co_readv, 2448 .bdrv_co_writev = iscsi_co_writev, 2449 .bdrv_co_flush_to_disk = iscsi_co_flush, 2450 2451 #ifdef __linux__ 2452 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2453 #endif 2454 2455 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2456 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2457 2458 .strong_runtime_opts = iscsi_strong_runtime_opts, 2459 }; 2460 2461 #if LIBISCSI_API_VERSION >= (20160603) 2462 static BlockDriver bdrv_iser = { 2463 .format_name = "iser", 2464 .protocol_name = "iser", 2465 2466 .instance_size = sizeof(IscsiLun), 2467 .bdrv_parse_filename = iscsi_parse_filename, 2468 .bdrv_file_open = iscsi_open, 2469 .bdrv_close = iscsi_close, 2470 .bdrv_co_create_opts = bdrv_co_create_opts_simple, 2471 .create_opts = &bdrv_create_opts_simple, 2472 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2473 .bdrv_reopen_commit = iscsi_reopen_commit, 2474 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2475 2476 .bdrv_co_getlength = iscsi_co_getlength, 2477 .bdrv_co_get_info = iscsi_co_get_info, 2478 .bdrv_co_truncate = iscsi_co_truncate, 2479 .bdrv_refresh_limits = iscsi_refresh_limits, 2480 2481 .bdrv_co_block_status = iscsi_co_block_status, 2482 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2483 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2484 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2485 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2486 .bdrv_co_readv = iscsi_co_readv, 2487 .bdrv_co_writev = iscsi_co_writev, 2488 .bdrv_co_flush_to_disk = iscsi_co_flush, 2489 2490 #ifdef __linux__ 2491 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2492 #endif 2493 2494 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2495 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2496 2497 .strong_runtime_opts = iscsi_strong_runtime_opts, 2498 }; 2499 #endif 2500 2501 static void iscsi_block_init(void) 2502 { 2503 bdrv_register(&bdrv_iscsi); 2504 #if LIBISCSI_API_VERSION >= (20160603) 2505 bdrv_register(&bdrv_iser); 2506 #endif 2507 } 2508 2509 block_init(iscsi_block_init); 2510