1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2017 Peter Lieven <pl@kamp.de> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 28 #include <poll.h> 29 #include <math.h> 30 #include <arpa/inet.h> 31 #include "qemu/config-file.h" 32 #include "qemu/error-report.h" 33 #include "qemu/bitops.h" 34 #include "qemu/bitmap.h" 35 #include "block/block_int.h" 36 #include "block/qdict.h" 37 #include "scsi/constants.h" 38 #include "qemu/iov.h" 39 #include "qemu/option.h" 40 #include "qemu/uuid.h" 41 #include "qapi/error.h" 42 #include "qapi/qapi-commands-misc.h" 43 #include "qapi/qmp/qdict.h" 44 #include "qapi/qmp/qstring.h" 45 #include "crypto/secret.h" 46 #include "scsi/utils.h" 47 #include "trace.h" 48 49 /* Conflict between scsi/utils.h and libiscsi! :( */ 50 #define SCSI_XFER_NONE ISCSI_XFER_NONE 51 #include <iscsi/iscsi.h> 52 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */ 53 #include <iscsi/scsi-lowlevel.h> 54 #undef inline 55 #undef SCSI_XFER_NONE 56 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 57 58 #ifdef __linux__ 59 #include <scsi/sg.h> 60 #endif 61 62 typedef struct IscsiLun { 63 struct iscsi_context *iscsi; 64 AioContext *aio_context; 65 int lun; 66 enum scsi_inquiry_peripheral_device_type type; 67 int block_size; 68 uint64_t num_blocks; 69 int events; 70 QEMUTimer *nop_timer; 71 QEMUTimer *event_timer; 72 QemuMutex mutex; 73 struct scsi_inquiry_logical_block_provisioning lbp; 74 struct scsi_inquiry_block_limits bl; 75 struct scsi_inquiry_device_designator *dd; 76 unsigned char *zeroblock; 77 /* The allocmap tracks which clusters (pages) on the iSCSI target are 78 * allocated and which are not. In case a target returns zeros for 79 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 80 * of reading zeros over the wire if a read request falls within an 81 * unallocated block. As there are 3 possible states we need 2 bitmaps to 82 * track. allocmap_valid keeps track if QEMU's information about a page is 83 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 84 * valid information about a page the corresponding allocmap entry should be 85 * switched to unallocated as well to force a new lookup of the allocation 86 * status as lookups are generally skipped if a page is suspect to be 87 * allocated. If a iSCSI target is opened with cache.direct = on the 88 * allocmap_valid does not exist turning all cached information invalid so 89 * that a fresh lookup is made for any page even if allocmap entry returns 90 * it's unallocated. */ 91 unsigned long *allocmap; 92 unsigned long *allocmap_valid; 93 long allocmap_size; 94 int cluster_size; 95 bool use_16_for_rw; 96 bool write_protected; 97 bool lbpme; 98 bool lbprz; 99 bool dpofua; 100 bool has_write_same; 101 bool request_timed_out; 102 } IscsiLun; 103 104 typedef struct IscsiTask { 105 int status; 106 int complete; 107 int retries; 108 int do_retry; 109 struct scsi_task *task; 110 Coroutine *co; 111 IscsiLun *iscsilun; 112 QEMUTimer retry_timer; 113 int err_code; 114 char *err_str; 115 } IscsiTask; 116 117 typedef struct IscsiAIOCB { 118 BlockAIOCB common; 119 QEMUBH *bh; 120 IscsiLun *iscsilun; 121 struct scsi_task *task; 122 int status; 123 int64_t sector_num; 124 int nb_sectors; 125 int ret; 126 #ifdef __linux__ 127 sg_io_hdr_t *ioh; 128 #endif 129 bool cancelled; 130 } IscsiAIOCB; 131 132 /* libiscsi uses time_t so its enough to process events every second */ 133 #define EVENT_INTERVAL 1000 134 #define NOP_INTERVAL 5000 135 #define MAX_NOP_FAILURES 3 136 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 137 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 138 139 /* this threshold is a trade-off knob to choose between 140 * the potential additional overhead of an extra GET_LBA_STATUS request 141 * vs. unnecessarily reading a lot of zero sectors over the wire. 142 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 143 * sectors we check the allocation status of the area covered by the 144 * request first if the allocationmap indicates that the area might be 145 * unallocated. */ 146 #define ISCSI_CHECKALLOC_THRES 64 147 148 #ifdef __linux__ 149 150 static void 151 iscsi_bh_cb(void *p) 152 { 153 IscsiAIOCB *acb = p; 154 155 qemu_bh_delete(acb->bh); 156 157 acb->common.cb(acb->common.opaque, acb->status); 158 159 if (acb->task != NULL) { 160 scsi_free_scsi_task(acb->task); 161 acb->task = NULL; 162 } 163 164 qemu_aio_unref(acb); 165 } 166 167 static void 168 iscsi_schedule_bh(IscsiAIOCB *acb) 169 { 170 if (acb->bh) { 171 return; 172 } 173 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 174 qemu_bh_schedule(acb->bh); 175 } 176 177 #endif 178 179 static void iscsi_co_generic_bh_cb(void *opaque) 180 { 181 struct IscsiTask *iTask = opaque; 182 183 iTask->complete = 1; 184 aio_co_wake(iTask->co); 185 } 186 187 static void iscsi_retry_timer_expired(void *opaque) 188 { 189 struct IscsiTask *iTask = opaque; 190 iTask->complete = 1; 191 if (iTask->co) { 192 aio_co_wake(iTask->co); 193 } 194 } 195 196 static inline unsigned exp_random(double mean) 197 { 198 return -mean * log((double)rand() / RAND_MAX); 199 } 200 201 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 202 * libiscsi 1.10.0, together with other constants we need. Use it as 203 * a hint that we have to define them ourselves if needed, to keep the 204 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 205 * the test because SCSI_STATUS_* is an enum. 206 * 207 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 208 * an enum, check against the LIBISCSI_API_VERSION macro, which was 209 * introduced in 1.11.0. If it is present, there is no need to define 210 * anything. 211 */ 212 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 213 !defined(LIBISCSI_API_VERSION) 214 #define SCSI_STATUS_TASK_SET_FULL 0x28 215 #define SCSI_STATUS_TIMEOUT 0x0f000002 216 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 217 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 218 #endif 219 220 #ifndef LIBISCSI_API_VERSION 221 #define LIBISCSI_API_VERSION 20130701 222 #endif 223 224 static int iscsi_translate_sense(struct scsi_sense *sense) 225 { 226 return - scsi_sense_to_errno(sense->key, 227 (sense->ascq & 0xFF00) >> 8, 228 sense->ascq & 0xFF); 229 } 230 231 /* Called (via iscsi_service) with QemuMutex held. */ 232 static void 233 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 234 void *command_data, void *opaque) 235 { 236 struct IscsiTask *iTask = opaque; 237 struct scsi_task *task = command_data; 238 239 iTask->status = status; 240 iTask->do_retry = 0; 241 iTask->task = task; 242 243 if (status != SCSI_STATUS_GOOD) { 244 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 245 if (status == SCSI_STATUS_CHECK_CONDITION 246 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 247 error_report("iSCSI CheckCondition: %s", 248 iscsi_get_error(iscsi)); 249 iTask->do_retry = 1; 250 goto out; 251 } 252 if (status == SCSI_STATUS_BUSY || 253 status == SCSI_STATUS_TIMEOUT || 254 status == SCSI_STATUS_TASK_SET_FULL) { 255 unsigned retry_time = 256 exp_random(iscsi_retry_times[iTask->retries - 1]); 257 if (status == SCSI_STATUS_TIMEOUT) { 258 /* make sure the request is rescheduled AFTER the 259 * reconnect is initiated */ 260 retry_time = EVENT_INTERVAL * 2; 261 iTask->iscsilun->request_timed_out = true; 262 } 263 error_report("iSCSI Busy/TaskSetFull/TimeOut" 264 " (retry #%u in %u ms): %s", 265 iTask->retries, retry_time, 266 iscsi_get_error(iscsi)); 267 aio_timer_init(iTask->iscsilun->aio_context, 268 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 269 SCALE_MS, iscsi_retry_timer_expired, iTask); 270 timer_mod(&iTask->retry_timer, 271 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 272 iTask->do_retry = 1; 273 return; 274 } 275 } 276 iTask->err_code = iscsi_translate_sense(&task->sense); 277 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 278 } 279 280 out: 281 if (iTask->co) { 282 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 283 iscsi_co_generic_bh_cb, iTask); 284 } else { 285 iTask->complete = 1; 286 } 287 } 288 289 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 290 { 291 *iTask = (struct IscsiTask) { 292 .co = qemu_coroutine_self(), 293 .iscsilun = iscsilun, 294 }; 295 } 296 297 #ifdef __linux__ 298 299 /* Called (via iscsi_service) with QemuMutex held. */ 300 static void 301 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 302 void *private_data) 303 { 304 IscsiAIOCB *acb = private_data; 305 306 /* If the command callback hasn't been called yet, drop the task */ 307 if (!acb->bh) { 308 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 309 iscsi_scsi_cancel_task(iscsi, acb->task); 310 } 311 312 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 313 } 314 315 static void 316 iscsi_aio_cancel(BlockAIOCB *blockacb) 317 { 318 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 319 IscsiLun *iscsilun = acb->iscsilun; 320 321 qemu_mutex_lock(&iscsilun->mutex); 322 323 /* If it was cancelled or completed already, our work is done here */ 324 if (acb->cancelled || acb->status != -EINPROGRESS) { 325 qemu_mutex_unlock(&iscsilun->mutex); 326 return; 327 } 328 329 acb->cancelled = true; 330 331 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 332 333 /* send a task mgmt call to the target to cancel the task on the target */ 334 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 335 iscsi_abort_task_cb, acb) < 0) { 336 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 337 } 338 339 qemu_mutex_unlock(&iscsilun->mutex); 340 } 341 342 static const AIOCBInfo iscsi_aiocb_info = { 343 .aiocb_size = sizeof(IscsiAIOCB), 344 .cancel_async = iscsi_aio_cancel, 345 }; 346 347 #endif 348 349 static void iscsi_process_read(void *arg); 350 static void iscsi_process_write(void *arg); 351 352 /* Called with QemuMutex held. */ 353 static void 354 iscsi_set_events(IscsiLun *iscsilun) 355 { 356 struct iscsi_context *iscsi = iscsilun->iscsi; 357 int ev = iscsi_which_events(iscsi); 358 359 if (ev != iscsilun->events) { 360 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 361 false, 362 (ev & POLLIN) ? iscsi_process_read : NULL, 363 (ev & POLLOUT) ? iscsi_process_write : NULL, 364 NULL, 365 iscsilun); 366 iscsilun->events = ev; 367 } 368 } 369 370 static void iscsi_timed_check_events(void *opaque) 371 { 372 IscsiLun *iscsilun = opaque; 373 374 qemu_mutex_lock(&iscsilun->mutex); 375 376 /* check for timed out requests */ 377 iscsi_service(iscsilun->iscsi, 0); 378 379 if (iscsilun->request_timed_out) { 380 iscsilun->request_timed_out = false; 381 iscsi_reconnect(iscsilun->iscsi); 382 } 383 384 /* newer versions of libiscsi may return zero events. Ensure we are able 385 * to return to service once this situation changes. */ 386 iscsi_set_events(iscsilun); 387 388 qemu_mutex_unlock(&iscsilun->mutex); 389 390 timer_mod(iscsilun->event_timer, 391 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 392 } 393 394 static void 395 iscsi_process_read(void *arg) 396 { 397 IscsiLun *iscsilun = arg; 398 struct iscsi_context *iscsi = iscsilun->iscsi; 399 400 qemu_mutex_lock(&iscsilun->mutex); 401 iscsi_service(iscsi, POLLIN); 402 iscsi_set_events(iscsilun); 403 qemu_mutex_unlock(&iscsilun->mutex); 404 } 405 406 static void 407 iscsi_process_write(void *arg) 408 { 409 IscsiLun *iscsilun = arg; 410 struct iscsi_context *iscsi = iscsilun->iscsi; 411 412 qemu_mutex_lock(&iscsilun->mutex); 413 iscsi_service(iscsi, POLLOUT); 414 iscsi_set_events(iscsilun); 415 qemu_mutex_unlock(&iscsilun->mutex); 416 } 417 418 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 419 { 420 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 421 } 422 423 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 424 { 425 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 426 } 427 428 static bool is_byte_request_lun_aligned(int64_t offset, int count, 429 IscsiLun *iscsilun) 430 { 431 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 432 error_report("iSCSI misaligned request: " 433 "iscsilun->block_size %u, offset %" PRIi64 434 ", count %d", 435 iscsilun->block_size, offset, count); 436 return false; 437 } 438 return true; 439 } 440 441 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 442 IscsiLun *iscsilun) 443 { 444 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 445 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 446 nb_sectors << BDRV_SECTOR_BITS, 447 iscsilun); 448 } 449 450 static void iscsi_allocmap_free(IscsiLun *iscsilun) 451 { 452 g_free(iscsilun->allocmap); 453 g_free(iscsilun->allocmap_valid); 454 iscsilun->allocmap = NULL; 455 iscsilun->allocmap_valid = NULL; 456 } 457 458 459 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 460 { 461 iscsi_allocmap_free(iscsilun); 462 463 assert(iscsilun->cluster_size); 464 iscsilun->allocmap_size = 465 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 466 iscsilun->cluster_size); 467 468 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 469 if (!iscsilun->allocmap) { 470 return -ENOMEM; 471 } 472 473 if (open_flags & BDRV_O_NOCACHE) { 474 /* when cache.direct = on all allocmap entries are 475 * treated as invalid to force a relookup of the block 476 * status on every read request */ 477 return 0; 478 } 479 480 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 481 if (!iscsilun->allocmap_valid) { 482 /* if we are under memory pressure free the allocmap as well */ 483 iscsi_allocmap_free(iscsilun); 484 return -ENOMEM; 485 } 486 487 return 0; 488 } 489 490 static void 491 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 492 int64_t bytes, bool allocated, bool valid) 493 { 494 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 495 496 if (iscsilun->allocmap == NULL) { 497 return; 498 } 499 /* expand to entirely contain all affected clusters */ 500 assert(iscsilun->cluster_size); 501 cl_num_expanded = offset / iscsilun->cluster_size; 502 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 503 iscsilun->cluster_size) - cl_num_expanded; 504 /* shrink to touch only completely contained clusters */ 505 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 506 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 507 if (allocated) { 508 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 509 } else { 510 if (nb_cls_shrunk > 0) { 511 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 512 } 513 } 514 515 if (iscsilun->allocmap_valid == NULL) { 516 return; 517 } 518 if (valid) { 519 if (nb_cls_shrunk > 0) { 520 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 521 } 522 } else { 523 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 524 nb_cls_expanded); 525 } 526 } 527 528 static void 529 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 530 int64_t bytes) 531 { 532 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 533 } 534 535 static void 536 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 537 int64_t bytes) 538 { 539 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 540 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 541 */ 542 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 543 } 544 545 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 546 int64_t bytes) 547 { 548 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 549 } 550 551 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 552 { 553 if (iscsilun->allocmap) { 554 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 555 } 556 if (iscsilun->allocmap_valid) { 557 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 558 } 559 } 560 561 static inline bool 562 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 563 int64_t bytes) 564 { 565 unsigned long size; 566 if (iscsilun->allocmap == NULL) { 567 return true; 568 } 569 assert(iscsilun->cluster_size); 570 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 571 return !(find_next_bit(iscsilun->allocmap, size, 572 offset / iscsilun->cluster_size) == size); 573 } 574 575 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 576 int64_t offset, int64_t bytes) 577 { 578 unsigned long size; 579 if (iscsilun->allocmap_valid == NULL) { 580 return false; 581 } 582 assert(iscsilun->cluster_size); 583 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 584 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 585 offset / iscsilun->cluster_size) == size); 586 } 587 588 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 589 IscsiLun *iscsilun) 590 { 591 while (!iTask->complete) { 592 iscsi_set_events(iscsilun); 593 qemu_mutex_unlock(&iscsilun->mutex); 594 qemu_coroutine_yield(); 595 qemu_mutex_lock(&iscsilun->mutex); 596 } 597 } 598 599 static int coroutine_fn 600 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 601 QEMUIOVector *iov, int flags) 602 { 603 IscsiLun *iscsilun = bs->opaque; 604 struct IscsiTask iTask; 605 uint64_t lba; 606 uint32_t num_sectors; 607 bool fua = flags & BDRV_REQ_FUA; 608 int r = 0; 609 610 if (fua) { 611 assert(iscsilun->dpofua); 612 } 613 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 614 return -EINVAL; 615 } 616 617 if (bs->bl.max_transfer) { 618 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 619 } 620 621 lba = sector_qemu2lun(sector_num, iscsilun); 622 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 623 iscsi_co_init_iscsitask(iscsilun, &iTask); 624 qemu_mutex_lock(&iscsilun->mutex); 625 retry: 626 if (iscsilun->use_16_for_rw) { 627 #if LIBISCSI_API_VERSION >= (20160603) 628 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 629 NULL, num_sectors * iscsilun->block_size, 630 iscsilun->block_size, 0, 0, fua, 0, 0, 631 iscsi_co_generic_cb, &iTask, 632 (struct scsi_iovec *)iov->iov, iov->niov); 633 } else { 634 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 635 NULL, num_sectors * iscsilun->block_size, 636 iscsilun->block_size, 0, 0, fua, 0, 0, 637 iscsi_co_generic_cb, &iTask, 638 (struct scsi_iovec *)iov->iov, iov->niov); 639 } 640 #else 641 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 642 NULL, num_sectors * iscsilun->block_size, 643 iscsilun->block_size, 0, 0, fua, 0, 0, 644 iscsi_co_generic_cb, &iTask); 645 } else { 646 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 647 NULL, num_sectors * iscsilun->block_size, 648 iscsilun->block_size, 0, 0, fua, 0, 0, 649 iscsi_co_generic_cb, &iTask); 650 } 651 #endif 652 if (iTask.task == NULL) { 653 qemu_mutex_unlock(&iscsilun->mutex); 654 return -ENOMEM; 655 } 656 #if LIBISCSI_API_VERSION < (20160603) 657 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 658 iov->niov); 659 #endif 660 iscsi_co_wait_for_task(&iTask, iscsilun); 661 662 if (iTask.task != NULL) { 663 scsi_free_scsi_task(iTask.task); 664 iTask.task = NULL; 665 } 666 667 if (iTask.do_retry) { 668 iTask.complete = 0; 669 goto retry; 670 } 671 672 if (iTask.status != SCSI_STATUS_GOOD) { 673 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 674 nb_sectors * BDRV_SECTOR_SIZE); 675 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 676 iTask.err_str); 677 r = iTask.err_code; 678 goto out_unlock; 679 } 680 681 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 682 nb_sectors * BDRV_SECTOR_SIZE); 683 684 out_unlock: 685 qemu_mutex_unlock(&iscsilun->mutex); 686 g_free(iTask.err_str); 687 return r; 688 } 689 690 691 692 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 693 bool want_zero, int64_t offset, 694 int64_t bytes, int64_t *pnum, 695 int64_t *map, 696 BlockDriverState **file) 697 { 698 IscsiLun *iscsilun = bs->opaque; 699 struct scsi_get_lba_status *lbas = NULL; 700 struct scsi_lba_status_descriptor *lbasd = NULL; 701 struct IscsiTask iTask; 702 uint64_t lba; 703 int ret; 704 705 iscsi_co_init_iscsitask(iscsilun, &iTask); 706 707 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 708 709 /* default to all sectors allocated */ 710 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 711 if (map) { 712 *map = offset; 713 } 714 *pnum = bytes; 715 716 /* LUN does not support logical block provisioning */ 717 if (!iscsilun->lbpme) { 718 goto out; 719 } 720 721 lba = offset / iscsilun->block_size; 722 723 qemu_mutex_lock(&iscsilun->mutex); 724 retry: 725 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 726 lba, 8 + 16, iscsi_co_generic_cb, 727 &iTask) == NULL) { 728 ret = -ENOMEM; 729 goto out_unlock; 730 } 731 iscsi_co_wait_for_task(&iTask, iscsilun); 732 733 if (iTask.do_retry) { 734 if (iTask.task != NULL) { 735 scsi_free_scsi_task(iTask.task); 736 iTask.task = NULL; 737 } 738 iTask.complete = 0; 739 goto retry; 740 } 741 742 if (iTask.status != SCSI_STATUS_GOOD) { 743 /* in case the get_lba_status_callout fails (i.e. 744 * because the device is busy or the cmd is not 745 * supported) we pretend all blocks are allocated 746 * for backwards compatibility */ 747 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 748 lba, iTask.err_str); 749 goto out_unlock; 750 } 751 752 lbas = scsi_datain_unmarshall(iTask.task); 753 if (lbas == NULL) { 754 ret = -EIO; 755 goto out_unlock; 756 } 757 758 lbasd = &lbas->descriptors[0]; 759 760 if (lba != lbasd->lba) { 761 ret = -EIO; 762 goto out_unlock; 763 } 764 765 *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size; 766 767 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 768 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 769 ret &= ~BDRV_BLOCK_DATA; 770 if (iscsilun->lbprz) { 771 ret |= BDRV_BLOCK_ZERO; 772 } 773 } 774 775 if (ret & BDRV_BLOCK_ZERO) { 776 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 777 } else { 778 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 779 } 780 781 if (*pnum > bytes) { 782 *pnum = bytes; 783 } 784 out_unlock: 785 qemu_mutex_unlock(&iscsilun->mutex); 786 g_free(iTask.err_str); 787 out: 788 if (iTask.task != NULL) { 789 scsi_free_scsi_task(iTask.task); 790 } 791 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 792 *file = bs; 793 } 794 return ret; 795 } 796 797 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 798 int64_t sector_num, int nb_sectors, 799 QEMUIOVector *iov) 800 { 801 IscsiLun *iscsilun = bs->opaque; 802 struct IscsiTask iTask; 803 uint64_t lba; 804 uint32_t num_sectors; 805 int r = 0; 806 807 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 808 return -EINVAL; 809 } 810 811 if (bs->bl.max_transfer) { 812 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 813 } 814 815 /* if cache.direct is off and we have a valid entry in our allocation map 816 * we can skip checking the block status and directly return zeroes if 817 * the request falls within an unallocated area */ 818 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 819 nb_sectors * BDRV_SECTOR_SIZE) && 820 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 821 nb_sectors * BDRV_SECTOR_SIZE)) { 822 qemu_iovec_memset(iov, 0, 0x00, iov->size); 823 return 0; 824 } 825 826 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 827 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 828 nb_sectors * BDRV_SECTOR_SIZE) && 829 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 830 nb_sectors * BDRV_SECTOR_SIZE)) { 831 int64_t pnum; 832 /* check the block status from the beginning of the cluster 833 * containing the start sector */ 834 int64_t head; 835 int ret; 836 837 assert(iscsilun->cluster_size); 838 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 839 ret = iscsi_co_block_status(bs, true, 840 sector_num * BDRV_SECTOR_SIZE - head, 841 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 842 if (ret < 0) { 843 return ret; 844 } 845 /* if the whole request falls into an unallocated area we can avoid 846 * reading and directly return zeroes instead */ 847 if (ret & BDRV_BLOCK_ZERO && 848 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 849 qemu_iovec_memset(iov, 0, 0x00, iov->size); 850 return 0; 851 } 852 } 853 854 lba = sector_qemu2lun(sector_num, iscsilun); 855 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 856 857 iscsi_co_init_iscsitask(iscsilun, &iTask); 858 qemu_mutex_lock(&iscsilun->mutex); 859 retry: 860 if (iscsilun->use_16_for_rw) { 861 #if LIBISCSI_API_VERSION >= (20160603) 862 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 863 num_sectors * iscsilun->block_size, 864 iscsilun->block_size, 0, 0, 0, 0, 0, 865 iscsi_co_generic_cb, &iTask, 866 (struct scsi_iovec *)iov->iov, iov->niov); 867 } else { 868 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 869 num_sectors * iscsilun->block_size, 870 iscsilun->block_size, 871 0, 0, 0, 0, 0, 872 iscsi_co_generic_cb, &iTask, 873 (struct scsi_iovec *)iov->iov, iov->niov); 874 } 875 #else 876 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 877 num_sectors * iscsilun->block_size, 878 iscsilun->block_size, 0, 0, 0, 0, 0, 879 iscsi_co_generic_cb, &iTask); 880 } else { 881 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 882 num_sectors * iscsilun->block_size, 883 iscsilun->block_size, 884 0, 0, 0, 0, 0, 885 iscsi_co_generic_cb, &iTask); 886 } 887 #endif 888 if (iTask.task == NULL) { 889 qemu_mutex_unlock(&iscsilun->mutex); 890 return -ENOMEM; 891 } 892 #if LIBISCSI_API_VERSION < (20160603) 893 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 894 #endif 895 896 iscsi_co_wait_for_task(&iTask, iscsilun); 897 if (iTask.task != NULL) { 898 scsi_free_scsi_task(iTask.task); 899 iTask.task = NULL; 900 } 901 902 if (iTask.do_retry) { 903 iTask.complete = 0; 904 goto retry; 905 } 906 907 if (iTask.status != SCSI_STATUS_GOOD) { 908 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 909 lba, iTask.err_str); 910 r = iTask.err_code; 911 } 912 913 qemu_mutex_unlock(&iscsilun->mutex); 914 g_free(iTask.err_str); 915 return r; 916 } 917 918 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 919 { 920 IscsiLun *iscsilun = bs->opaque; 921 struct IscsiTask iTask; 922 int r = 0; 923 924 iscsi_co_init_iscsitask(iscsilun, &iTask); 925 qemu_mutex_lock(&iscsilun->mutex); 926 retry: 927 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 928 0, iscsi_co_generic_cb, &iTask) == NULL) { 929 qemu_mutex_unlock(&iscsilun->mutex); 930 return -ENOMEM; 931 } 932 933 iscsi_co_wait_for_task(&iTask, iscsilun); 934 935 if (iTask.task != NULL) { 936 scsi_free_scsi_task(iTask.task); 937 iTask.task = NULL; 938 } 939 940 if (iTask.do_retry) { 941 iTask.complete = 0; 942 goto retry; 943 } 944 945 if (iTask.status != SCSI_STATUS_GOOD) { 946 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 947 r = iTask.err_code; 948 } 949 950 qemu_mutex_unlock(&iscsilun->mutex); 951 g_free(iTask.err_str); 952 return r; 953 } 954 955 #ifdef __linux__ 956 /* Called (via iscsi_service) with QemuMutex held. */ 957 static void 958 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 959 void *command_data, void *opaque) 960 { 961 IscsiAIOCB *acb = opaque; 962 963 if (status == SCSI_STATUS_CANCELLED) { 964 if (!acb->bh) { 965 acb->status = -ECANCELED; 966 iscsi_schedule_bh(acb); 967 } 968 return; 969 } 970 971 acb->status = 0; 972 if (status < 0) { 973 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 974 iscsi_get_error(iscsi)); 975 acb->status = iscsi_translate_sense(&acb->task->sense); 976 } 977 978 acb->ioh->driver_status = 0; 979 acb->ioh->host_status = 0; 980 acb->ioh->resid = 0; 981 acb->ioh->status = status; 982 983 #define SG_ERR_DRIVER_SENSE 0x08 984 985 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 986 int ss; 987 988 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 989 990 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 991 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 992 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, int bytes) 1143 { 1144 IscsiLun *iscsilun = bs->opaque; 1145 struct IscsiTask iTask; 1146 struct unmap_list list; 1147 int r = 0; 1148 1149 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1150 return -ENOTSUP; 1151 } 1152 1153 if (!iscsilun->lbp.lbpu) { 1154 /* UNMAP is not supported by the target */ 1155 return 0; 1156 } 1157 1158 list.lba = offset / iscsilun->block_size; 1159 list.num = bytes / iscsilun->block_size; 1160 1161 iscsi_co_init_iscsitask(iscsilun, &iTask); 1162 qemu_mutex_lock(&iscsilun->mutex); 1163 retry: 1164 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1165 iscsi_co_generic_cb, &iTask) == NULL) { 1166 r = -ENOMEM; 1167 goto out_unlock; 1168 } 1169 1170 iscsi_co_wait_for_task(&iTask, iscsilun); 1171 1172 if (iTask.task != NULL) { 1173 scsi_free_scsi_task(iTask.task); 1174 iTask.task = NULL; 1175 } 1176 1177 if (iTask.do_retry) { 1178 iTask.complete = 0; 1179 goto retry; 1180 } 1181 1182 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1183 1184 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1185 /* the target might fail with a check condition if it 1186 is not happy with the alignment of the UNMAP request 1187 we silently fail in this case */ 1188 goto out_unlock; 1189 } 1190 1191 if (iTask.status != SCSI_STATUS_GOOD) { 1192 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1193 list.lba, iTask.err_str); 1194 r = iTask.err_code; 1195 goto out_unlock; 1196 } 1197 1198 out_unlock: 1199 qemu_mutex_unlock(&iscsilun->mutex); 1200 g_free(iTask.err_str); 1201 return r; 1202 } 1203 1204 static int 1205 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1206 int bytes, BdrvRequestFlags flags) 1207 { 1208 IscsiLun *iscsilun = bs->opaque; 1209 struct IscsiTask iTask; 1210 uint64_t lba; 1211 uint32_t nb_blocks; 1212 bool use_16_for_ws = iscsilun->use_16_for_rw; 1213 int r = 0; 1214 1215 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1216 return -ENOTSUP; 1217 } 1218 1219 if (flags & BDRV_REQ_MAY_UNMAP) { 1220 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1221 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1222 use_16_for_ws = true; 1223 } 1224 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1225 /* WRITESAME16 with UNMAP is not supported by the target, 1226 * fall back and try WRITESAME10/16 without UNMAP */ 1227 flags &= ~BDRV_REQ_MAY_UNMAP; 1228 use_16_for_ws = iscsilun->use_16_for_rw; 1229 } 1230 } 1231 1232 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1233 /* WRITESAME without UNMAP is not supported by the target */ 1234 return -ENOTSUP; 1235 } 1236 1237 lba = offset / iscsilun->block_size; 1238 nb_blocks = bytes / iscsilun->block_size; 1239 1240 if (iscsilun->zeroblock == NULL) { 1241 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1242 if (iscsilun->zeroblock == NULL) { 1243 return -ENOMEM; 1244 } 1245 } 1246 1247 qemu_mutex_lock(&iscsilun->mutex); 1248 iscsi_co_init_iscsitask(iscsilun, &iTask); 1249 retry: 1250 if (use_16_for_ws) { 1251 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1252 iscsilun->zeroblock, iscsilun->block_size, 1253 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1254 0, 0, iscsi_co_generic_cb, &iTask); 1255 } else { 1256 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1257 iscsilun->zeroblock, iscsilun->block_size, 1258 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1259 0, 0, iscsi_co_generic_cb, &iTask); 1260 } 1261 if (iTask.task == NULL) { 1262 qemu_mutex_unlock(&iscsilun->mutex); 1263 return -ENOMEM; 1264 } 1265 1266 iscsi_co_wait_for_task(&iTask, iscsilun); 1267 1268 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1269 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1270 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1271 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1272 /* WRITE SAME is not supported by the target */ 1273 iscsilun->has_write_same = false; 1274 scsi_free_scsi_task(iTask.task); 1275 r = -ENOTSUP; 1276 goto out_unlock; 1277 } 1278 1279 if (iTask.task != NULL) { 1280 scsi_free_scsi_task(iTask.task); 1281 iTask.task = NULL; 1282 } 1283 1284 if (iTask.do_retry) { 1285 iTask.complete = 0; 1286 goto retry; 1287 } 1288 1289 if (iTask.status != SCSI_STATUS_GOOD) { 1290 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1291 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1292 lba, iTask.err_str); 1293 r = iTask.err_code; 1294 goto out_unlock; 1295 } 1296 1297 if (flags & BDRV_REQ_MAY_UNMAP) { 1298 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1299 } else { 1300 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1301 } 1302 1303 out_unlock: 1304 qemu_mutex_unlock(&iscsilun->mutex); 1305 g_free(iTask.err_str); 1306 return r; 1307 } 1308 1309 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1310 Error **errp) 1311 { 1312 const char *user = NULL; 1313 const char *password = NULL; 1314 const char *secretid; 1315 char *secret = NULL; 1316 1317 user = qemu_opt_get(opts, "user"); 1318 if (!user) { 1319 return; 1320 } 1321 1322 secretid = qemu_opt_get(opts, "password-secret"); 1323 password = qemu_opt_get(opts, "password"); 1324 if (secretid && password) { 1325 error_setg(errp, "'password' and 'password-secret' properties are " 1326 "mutually exclusive"); 1327 return; 1328 } 1329 if (secretid) { 1330 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1331 if (!secret) { 1332 return; 1333 } 1334 password = secret; 1335 } else if (!password) { 1336 error_setg(errp, "CHAP username specified but no password was given"); 1337 return; 1338 } 1339 1340 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1341 error_setg(errp, "Failed to set initiator username and password"); 1342 } 1343 1344 g_free(secret); 1345 } 1346 1347 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1348 Error **errp) 1349 { 1350 const char *digest = NULL; 1351 1352 digest = qemu_opt_get(opts, "header-digest"); 1353 if (!digest) { 1354 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1355 } else if (!strcmp(digest, "crc32c")) { 1356 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1357 } else if (!strcmp(digest, "none")) { 1358 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1359 } else if (!strcmp(digest, "crc32c-none")) { 1360 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1361 } else if (!strcmp(digest, "none-crc32c")) { 1362 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1363 } else { 1364 error_setg(errp, "Invalid header-digest setting : %s", digest); 1365 } 1366 } 1367 1368 static char *get_initiator_name(QemuOpts *opts) 1369 { 1370 const char *name; 1371 char *iscsi_name; 1372 UuidInfo *uuid_info; 1373 1374 name = qemu_opt_get(opts, "initiator-name"); 1375 if (name) { 1376 return g_strdup(name); 1377 } 1378 1379 uuid_info = qmp_query_uuid(NULL); 1380 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1381 name = qemu_get_vm_name(); 1382 } else { 1383 name = uuid_info->UUID; 1384 } 1385 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1386 name ? ":" : "", name ? name : ""); 1387 qapi_free_UuidInfo(uuid_info); 1388 return iscsi_name; 1389 } 1390 1391 static void iscsi_nop_timed_event(void *opaque) 1392 { 1393 IscsiLun *iscsilun = opaque; 1394 1395 qemu_mutex_lock(&iscsilun->mutex); 1396 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1397 error_report("iSCSI: NOP timeout. Reconnecting..."); 1398 iscsilun->request_timed_out = true; 1399 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1400 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1401 goto out; 1402 } 1403 1404 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1405 iscsi_set_events(iscsilun); 1406 1407 out: 1408 qemu_mutex_unlock(&iscsilun->mutex); 1409 } 1410 1411 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1412 { 1413 struct scsi_task *task = NULL; 1414 struct scsi_readcapacity10 *rc10 = NULL; 1415 struct scsi_readcapacity16 *rc16 = NULL; 1416 int retries = ISCSI_CMD_RETRIES; 1417 1418 do { 1419 if (task != NULL) { 1420 scsi_free_scsi_task(task); 1421 task = NULL; 1422 } 1423 1424 switch (iscsilun->type) { 1425 case TYPE_DISK: 1426 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1427 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1428 rc16 = scsi_datain_unmarshall(task); 1429 if (rc16 == NULL) { 1430 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1431 } else { 1432 iscsilun->block_size = rc16->block_length; 1433 iscsilun->num_blocks = rc16->returned_lba + 1; 1434 iscsilun->lbpme = !!rc16->lbpme; 1435 iscsilun->lbprz = !!rc16->lbprz; 1436 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1437 } 1438 break; 1439 } 1440 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1441 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1442 break; 1443 } 1444 /* Fall through and try READ CAPACITY(10) instead. */ 1445 case TYPE_ROM: 1446 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1447 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1448 rc10 = scsi_datain_unmarshall(task); 1449 if (rc10 == NULL) { 1450 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1451 } else { 1452 iscsilun->block_size = rc10->block_size; 1453 if (rc10->lba == 0) { 1454 /* blank disk loaded */ 1455 iscsilun->num_blocks = 0; 1456 } else { 1457 iscsilun->num_blocks = rc10->lba + 1; 1458 } 1459 } 1460 } 1461 break; 1462 default: 1463 return; 1464 } 1465 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1466 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1467 && retries-- > 0); 1468 1469 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1470 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1471 } else if (!iscsilun->block_size || 1472 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1473 error_setg(errp, "iSCSI: the target returned an invalid " 1474 "block size of %d.", iscsilun->block_size); 1475 } 1476 if (task) { 1477 scsi_free_scsi_task(task); 1478 } 1479 } 1480 1481 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1482 int evpd, int pc, void **inq, Error **errp) 1483 { 1484 int full_size; 1485 struct scsi_task *task = NULL; 1486 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1487 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1488 goto fail; 1489 } 1490 full_size = scsi_datain_getfullsize(task); 1491 if (full_size > task->datain.size) { 1492 scsi_free_scsi_task(task); 1493 1494 /* we need more data for the full list */ 1495 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1496 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1497 goto fail; 1498 } 1499 } 1500 1501 *inq = scsi_datain_unmarshall(task); 1502 if (*inq == NULL) { 1503 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1504 goto fail_with_err; 1505 } 1506 1507 return task; 1508 1509 fail: 1510 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1511 iscsi_get_error(iscsi)); 1512 fail_with_err: 1513 if (task != NULL) { 1514 scsi_free_scsi_task(task); 1515 } 1516 return NULL; 1517 } 1518 1519 static void iscsi_detach_aio_context(BlockDriverState *bs) 1520 { 1521 IscsiLun *iscsilun = bs->opaque; 1522 1523 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1524 false, NULL, NULL, NULL, NULL); 1525 iscsilun->events = 0; 1526 1527 if (iscsilun->nop_timer) { 1528 timer_del(iscsilun->nop_timer); 1529 timer_free(iscsilun->nop_timer); 1530 iscsilun->nop_timer = NULL; 1531 } 1532 if (iscsilun->event_timer) { 1533 timer_del(iscsilun->event_timer); 1534 timer_free(iscsilun->event_timer); 1535 iscsilun->event_timer = NULL; 1536 } 1537 } 1538 1539 static void iscsi_attach_aio_context(BlockDriverState *bs, 1540 AioContext *new_context) 1541 { 1542 IscsiLun *iscsilun = bs->opaque; 1543 1544 iscsilun->aio_context = new_context; 1545 iscsi_set_events(iscsilun); 1546 1547 /* Set up a timer for sending out iSCSI NOPs */ 1548 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1549 QEMU_CLOCK_REALTIME, SCALE_MS, 1550 iscsi_nop_timed_event, iscsilun); 1551 timer_mod(iscsilun->nop_timer, 1552 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1553 1554 /* Set up a timer for periodic calls to iscsi_set_events and to 1555 * scan for command timeout */ 1556 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1557 QEMU_CLOCK_REALTIME, SCALE_MS, 1558 iscsi_timed_check_events, iscsilun); 1559 timer_mod(iscsilun->event_timer, 1560 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1561 } 1562 1563 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1564 { 1565 struct scsi_task *task; 1566 struct scsi_mode_sense *ms = NULL; 1567 iscsilun->write_protected = false; 1568 iscsilun->dpofua = false; 1569 1570 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1571 1, SCSI_MODESENSE_PC_CURRENT, 1572 0x3F, 0, 255); 1573 if (task == NULL) { 1574 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1575 iscsi_get_error(iscsilun->iscsi)); 1576 goto out; 1577 } 1578 1579 if (task->status != SCSI_STATUS_GOOD) { 1580 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1581 goto out; 1582 } 1583 ms = scsi_datain_unmarshall(task); 1584 if (!ms) { 1585 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1586 iscsi_get_error(iscsilun->iscsi)); 1587 goto out; 1588 } 1589 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1590 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1591 1592 out: 1593 if (task) { 1594 scsi_free_scsi_task(task); 1595 } 1596 } 1597 1598 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1599 { 1600 QemuOptsList *list; 1601 QemuOpts *opts; 1602 const char *user, *password, *password_secret, *initiator_name, 1603 *header_digest, *timeout; 1604 1605 list = qemu_find_opts("iscsi"); 1606 if (!list) { 1607 return; 1608 } 1609 1610 opts = qemu_opts_find(list, target); 1611 if (opts == NULL) { 1612 opts = QTAILQ_FIRST(&list->head); 1613 if (!opts) { 1614 return; 1615 } 1616 } 1617 1618 user = qemu_opt_get(opts, "user"); 1619 if (user) { 1620 qdict_set_default_str(options, "user", user); 1621 } 1622 1623 password = qemu_opt_get(opts, "password"); 1624 if (password) { 1625 qdict_set_default_str(options, "password", password); 1626 } 1627 1628 password_secret = qemu_opt_get(opts, "password-secret"); 1629 if (password_secret) { 1630 qdict_set_default_str(options, "password-secret", password_secret); 1631 } 1632 1633 initiator_name = qemu_opt_get(opts, "initiator-name"); 1634 if (initiator_name) { 1635 qdict_set_default_str(options, "initiator-name", initiator_name); 1636 } 1637 1638 header_digest = qemu_opt_get(opts, "header-digest"); 1639 if (header_digest) { 1640 /* -iscsi takes upper case values, but QAPI only supports lower case 1641 * enum constant names, so we have to convert here. */ 1642 char *qapi_value = g_ascii_strdown(header_digest, -1); 1643 qdict_set_default_str(options, "header-digest", qapi_value); 1644 g_free(qapi_value); 1645 } 1646 1647 timeout = qemu_opt_get(opts, "timeout"); 1648 if (timeout) { 1649 qdict_set_default_str(options, "timeout", timeout); 1650 } 1651 } 1652 1653 /* 1654 * We support iscsi url's on the form 1655 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1656 */ 1657 static void iscsi_parse_filename(const char *filename, QDict *options, 1658 Error **errp) 1659 { 1660 struct iscsi_url *iscsi_url; 1661 const char *transport_name; 1662 char *lun_str; 1663 1664 iscsi_url = iscsi_parse_full_url(NULL, filename); 1665 if (iscsi_url == NULL) { 1666 error_setg(errp, "Failed to parse URL : %s", filename); 1667 return; 1668 } 1669 1670 #if LIBISCSI_API_VERSION >= (20160603) 1671 switch (iscsi_url->transport) { 1672 case TCP_TRANSPORT: 1673 transport_name = "tcp"; 1674 break; 1675 case ISER_TRANSPORT: 1676 transport_name = "iser"; 1677 break; 1678 default: 1679 error_setg(errp, "Unknown transport type (%d)", 1680 iscsi_url->transport); 1681 return; 1682 } 1683 #else 1684 transport_name = "tcp"; 1685 #endif 1686 1687 qdict_set_default_str(options, "transport", transport_name); 1688 qdict_set_default_str(options, "portal", iscsi_url->portal); 1689 qdict_set_default_str(options, "target", iscsi_url->target); 1690 1691 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1692 qdict_set_default_str(options, "lun", lun_str); 1693 g_free(lun_str); 1694 1695 /* User/password from -iscsi take precedence over those from the URL */ 1696 iscsi_parse_iscsi_option(iscsi_url->target, options); 1697 1698 if (iscsi_url->user[0] != '\0') { 1699 qdict_set_default_str(options, "user", iscsi_url->user); 1700 qdict_set_default_str(options, "password", iscsi_url->passwd); 1701 } 1702 1703 iscsi_destroy_url(iscsi_url); 1704 } 1705 1706 static QemuOptsList runtime_opts = { 1707 .name = "iscsi", 1708 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1709 .desc = { 1710 { 1711 .name = "transport", 1712 .type = QEMU_OPT_STRING, 1713 }, 1714 { 1715 .name = "portal", 1716 .type = QEMU_OPT_STRING, 1717 }, 1718 { 1719 .name = "target", 1720 .type = QEMU_OPT_STRING, 1721 }, 1722 { 1723 .name = "user", 1724 .type = QEMU_OPT_STRING, 1725 }, 1726 { 1727 .name = "password", 1728 .type = QEMU_OPT_STRING, 1729 }, 1730 { 1731 .name = "password-secret", 1732 .type = QEMU_OPT_STRING, 1733 }, 1734 { 1735 .name = "lun", 1736 .type = QEMU_OPT_NUMBER, 1737 }, 1738 { 1739 .name = "initiator-name", 1740 .type = QEMU_OPT_STRING, 1741 }, 1742 { 1743 .name = "header-digest", 1744 .type = QEMU_OPT_STRING, 1745 }, 1746 { 1747 .name = "timeout", 1748 .type = QEMU_OPT_NUMBER, 1749 }, 1750 { /* end of list */ } 1751 }, 1752 }; 1753 1754 static void iscsi_save_designator(IscsiLun *lun, 1755 struct scsi_inquiry_device_identification *inq_di) 1756 { 1757 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1758 1759 for (desig = inq_di->designators; desig; desig = desig->next) { 1760 if (desig->association || 1761 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1762 continue; 1763 } 1764 /* NAA works better than T10 vendor ID based designator. */ 1765 if (!copy || copy->designator_type < desig->designator_type) { 1766 copy = desig; 1767 } 1768 } 1769 if (copy) { 1770 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1771 *lun->dd = *copy; 1772 lun->dd->next = NULL; 1773 lun->dd->designator = g_malloc(copy->designator_length); 1774 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1775 } 1776 } 1777 1778 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1779 Error **errp) 1780 { 1781 IscsiLun *iscsilun = bs->opaque; 1782 struct iscsi_context *iscsi = NULL; 1783 struct scsi_task *task = NULL; 1784 struct scsi_inquiry_standard *inq = NULL; 1785 struct scsi_inquiry_supported_pages *inq_vpd; 1786 char *initiator_name = NULL; 1787 QemuOpts *opts; 1788 Error *local_err = NULL; 1789 const char *transport_name, *portal, *target; 1790 #if LIBISCSI_API_VERSION >= (20160603) 1791 enum iscsi_transport_type transport; 1792 #endif 1793 int i, ret = 0, timeout = 0, lun; 1794 1795 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1796 qemu_opts_absorb_qdict(opts, options, &local_err); 1797 if (local_err) { 1798 error_propagate(errp, local_err); 1799 ret = -EINVAL; 1800 goto out; 1801 } 1802 1803 transport_name = qemu_opt_get(opts, "transport"); 1804 portal = qemu_opt_get(opts, "portal"); 1805 target = qemu_opt_get(opts, "target"); 1806 lun = qemu_opt_get_number(opts, "lun", 0); 1807 1808 if (!transport_name || !portal || !target) { 1809 error_setg(errp, "Need all of transport, portal and target options"); 1810 ret = -EINVAL; 1811 goto out; 1812 } 1813 1814 if (!strcmp(transport_name, "tcp")) { 1815 #if LIBISCSI_API_VERSION >= (20160603) 1816 transport = TCP_TRANSPORT; 1817 } else if (!strcmp(transport_name, "iser")) { 1818 transport = ISER_TRANSPORT; 1819 #else 1820 /* TCP is what older libiscsi versions always use */ 1821 #endif 1822 } else { 1823 error_setg(errp, "Unknown transport: %s", transport_name); 1824 ret = -EINVAL; 1825 goto out; 1826 } 1827 1828 memset(iscsilun, 0, sizeof(IscsiLun)); 1829 1830 initiator_name = get_initiator_name(opts); 1831 1832 iscsi = iscsi_create_context(initiator_name); 1833 if (iscsi == NULL) { 1834 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1835 ret = -ENOMEM; 1836 goto out; 1837 } 1838 #if LIBISCSI_API_VERSION >= (20160603) 1839 if (iscsi_init_transport(iscsi, transport)) { 1840 error_setg(errp, ("Error initializing transport.")); 1841 ret = -EINVAL; 1842 goto out; 1843 } 1844 #endif 1845 if (iscsi_set_targetname(iscsi, target)) { 1846 error_setg(errp, "iSCSI: Failed to set target name."); 1847 ret = -EINVAL; 1848 goto out; 1849 } 1850 1851 /* check if we got CHAP username/password via the options */ 1852 apply_chap(iscsi, opts, &local_err); 1853 if (local_err != NULL) { 1854 error_propagate(errp, local_err); 1855 ret = -EINVAL; 1856 goto out; 1857 } 1858 1859 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1860 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1861 ret = -EINVAL; 1862 goto out; 1863 } 1864 1865 /* check if we got HEADER_DIGEST via the options */ 1866 apply_header_digest(iscsi, opts, &local_err); 1867 if (local_err != NULL) { 1868 error_propagate(errp, local_err); 1869 ret = -EINVAL; 1870 goto out; 1871 } 1872 1873 /* timeout handling is broken in libiscsi before 1.15.0 */ 1874 timeout = qemu_opt_get_number(opts, "timeout", 0); 1875 #if LIBISCSI_API_VERSION >= 20150621 1876 iscsi_set_timeout(iscsi, timeout); 1877 #else 1878 if (timeout) { 1879 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1880 } 1881 #endif 1882 1883 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1884 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1885 iscsi_get_error(iscsi)); 1886 ret = -EINVAL; 1887 goto out; 1888 } 1889 1890 iscsilun->iscsi = iscsi; 1891 iscsilun->aio_context = bdrv_get_aio_context(bs); 1892 iscsilun->lun = lun; 1893 iscsilun->has_write_same = true; 1894 1895 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1896 (void **) &inq, errp); 1897 if (task == NULL) { 1898 ret = -EINVAL; 1899 goto out; 1900 } 1901 iscsilun->type = inq->periperal_device_type; 1902 scsi_free_scsi_task(task); 1903 task = NULL; 1904 1905 iscsi_modesense_sync(iscsilun); 1906 if (iscsilun->dpofua) { 1907 bs->supported_write_flags = BDRV_REQ_FUA; 1908 } 1909 1910 /* Check the write protect flag of the LUN if we want to write */ 1911 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1912 iscsilun->write_protected) { 1913 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1914 if (ret < 0) { 1915 goto out; 1916 } 1917 flags &= ~BDRV_O_RDWR; 1918 } 1919 1920 iscsi_readcapacity_sync(iscsilun, &local_err); 1921 if (local_err != NULL) { 1922 error_propagate(errp, local_err); 1923 ret = -EINVAL; 1924 goto out; 1925 } 1926 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1927 1928 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1929 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1930 * will try to read from the device to guess the image format. 1931 */ 1932 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1933 bs->sg = true; 1934 } 1935 1936 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1937 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1938 (void **) &inq_vpd, errp); 1939 if (task == NULL) { 1940 ret = -EINVAL; 1941 goto out; 1942 } 1943 for (i = 0; i < inq_vpd->num_pages; i++) { 1944 struct scsi_task *inq_task; 1945 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1946 struct scsi_inquiry_block_limits *inq_bl; 1947 struct scsi_inquiry_device_identification *inq_di; 1948 switch (inq_vpd->pages[i]) { 1949 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1950 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1951 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1952 (void **) &inq_lbp, errp); 1953 if (inq_task == NULL) { 1954 ret = -EINVAL; 1955 goto out; 1956 } 1957 memcpy(&iscsilun->lbp, inq_lbp, 1958 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1959 scsi_free_scsi_task(inq_task); 1960 break; 1961 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1962 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1963 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1964 (void **) &inq_bl, errp); 1965 if (inq_task == NULL) { 1966 ret = -EINVAL; 1967 goto out; 1968 } 1969 memcpy(&iscsilun->bl, inq_bl, 1970 sizeof(struct scsi_inquiry_block_limits)); 1971 scsi_free_scsi_task(inq_task); 1972 break; 1973 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1974 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1975 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1976 (void **) &inq_di, errp); 1977 if (inq_task == NULL) { 1978 ret = -EINVAL; 1979 goto out; 1980 } 1981 iscsi_save_designator(iscsilun, inq_di); 1982 scsi_free_scsi_task(inq_task); 1983 break; 1984 default: 1985 break; 1986 } 1987 } 1988 scsi_free_scsi_task(task); 1989 task = NULL; 1990 1991 qemu_mutex_init(&iscsilun->mutex); 1992 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1993 1994 /* Guess the internal cluster (page) size of the iscsi target by the means 1995 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1996 * reasonable size */ 1997 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1998 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1999 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 2000 iscsilun->block_size; 2001 if (iscsilun->lbprz) { 2002 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 2003 } 2004 } 2005 2006 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2007 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2008 } 2009 2010 out: 2011 qemu_opts_del(opts); 2012 g_free(initiator_name); 2013 if (task != NULL) { 2014 scsi_free_scsi_task(task); 2015 } 2016 2017 if (ret) { 2018 if (iscsi != NULL) { 2019 if (iscsi_is_logged_in(iscsi)) { 2020 iscsi_logout_sync(iscsi); 2021 } 2022 iscsi_destroy_context(iscsi); 2023 } 2024 memset(iscsilun, 0, sizeof(IscsiLun)); 2025 } 2026 2027 return ret; 2028 } 2029 2030 static void iscsi_close(BlockDriverState *bs) 2031 { 2032 IscsiLun *iscsilun = bs->opaque; 2033 struct iscsi_context *iscsi = iscsilun->iscsi; 2034 2035 iscsi_detach_aio_context(bs); 2036 if (iscsi_is_logged_in(iscsi)) { 2037 iscsi_logout_sync(iscsi); 2038 } 2039 iscsi_destroy_context(iscsi); 2040 if (iscsilun->dd) { 2041 g_free(iscsilun->dd->designator); 2042 g_free(iscsilun->dd); 2043 } 2044 g_free(iscsilun->zeroblock); 2045 iscsi_allocmap_free(iscsilun); 2046 qemu_mutex_destroy(&iscsilun->mutex); 2047 memset(iscsilun, 0, sizeof(IscsiLun)); 2048 } 2049 2050 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2051 { 2052 /* We don't actually refresh here, but just return data queried in 2053 * iscsi_open(): iscsi targets don't change their limits. */ 2054 2055 IscsiLun *iscsilun = bs->opaque; 2056 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2057 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2058 2059 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2060 2061 bs->bl.request_alignment = block_size; 2062 2063 if (iscsilun->bl.max_xfer_len) { 2064 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2065 } 2066 2067 if (max_xfer_len * block_size < INT_MAX) { 2068 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2069 } 2070 2071 if (iscsilun->lbp.lbpu) { 2072 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2073 bs->bl.max_pdiscard = 2074 iscsilun->bl.max_unmap * iscsilun->block_size; 2075 } 2076 bs->bl.pdiscard_alignment = 2077 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2078 } else { 2079 bs->bl.pdiscard_alignment = iscsilun->block_size; 2080 } 2081 2082 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2083 bs->bl.max_pwrite_zeroes = 2084 iscsilun->bl.max_ws_len * iscsilun->block_size; 2085 } 2086 if (iscsilun->lbp.lbpws) { 2087 bs->bl.pwrite_zeroes_alignment = 2088 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2089 } else { 2090 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2091 } 2092 if (iscsilun->bl.opt_xfer_len && 2093 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2094 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2095 iscsilun->block_size); 2096 } 2097 } 2098 2099 /* Note that this will not re-establish a connection with an iSCSI target - it 2100 * is effectively a NOP. */ 2101 static int iscsi_reopen_prepare(BDRVReopenState *state, 2102 BlockReopenQueue *queue, Error **errp) 2103 { 2104 IscsiLun *iscsilun = state->bs->opaque; 2105 2106 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2107 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2108 return -EACCES; 2109 } 2110 return 0; 2111 } 2112 2113 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2114 { 2115 IscsiLun *iscsilun = reopen_state->bs->opaque; 2116 2117 /* the cache.direct status might have changed */ 2118 if (iscsilun->allocmap != NULL) { 2119 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2120 } 2121 } 2122 2123 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2124 PreallocMode prealloc, Error **errp) 2125 { 2126 IscsiLun *iscsilun = bs->opaque; 2127 Error *local_err = NULL; 2128 2129 if (prealloc != PREALLOC_MODE_OFF) { 2130 error_setg(errp, "Unsupported preallocation mode '%s'", 2131 PreallocMode_str(prealloc)); 2132 return -ENOTSUP; 2133 } 2134 2135 if (iscsilun->type != TYPE_DISK) { 2136 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2137 return -ENOTSUP; 2138 } 2139 2140 iscsi_readcapacity_sync(iscsilun, &local_err); 2141 if (local_err != NULL) { 2142 error_propagate(errp, local_err); 2143 return -EIO; 2144 } 2145 2146 if (offset > iscsi_getlength(bs)) { 2147 error_setg(errp, "Cannot grow iSCSI devices"); 2148 return -EINVAL; 2149 } 2150 2151 if (iscsilun->allocmap != NULL) { 2152 iscsi_allocmap_init(iscsilun, bs->open_flags); 2153 } 2154 2155 return 0; 2156 } 2157 2158 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2159 Error **errp) 2160 { 2161 int ret = 0; 2162 int64_t total_size = 0; 2163 BlockDriverState *bs; 2164 IscsiLun *iscsilun = NULL; 2165 QDict *bs_options; 2166 Error *local_err = NULL; 2167 2168 bs = bdrv_new(); 2169 2170 /* Read out options */ 2171 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2172 BDRV_SECTOR_SIZE); 2173 bs->opaque = g_new0(struct IscsiLun, 1); 2174 iscsilun = bs->opaque; 2175 2176 bs_options = qdict_new(); 2177 iscsi_parse_filename(filename, bs_options, &local_err); 2178 if (local_err) { 2179 error_propagate(errp, local_err); 2180 ret = -EINVAL; 2181 } else { 2182 ret = iscsi_open(bs, bs_options, 0, NULL); 2183 } 2184 qobject_unref(bs_options); 2185 2186 if (ret != 0) { 2187 goto out; 2188 } 2189 iscsi_detach_aio_context(bs); 2190 if (iscsilun->type != TYPE_DISK) { 2191 ret = -ENODEV; 2192 goto out; 2193 } 2194 if (bs->total_sectors < total_size) { 2195 ret = -ENOSPC; 2196 goto out; 2197 } 2198 2199 ret = 0; 2200 out: 2201 if (iscsilun->iscsi != NULL) { 2202 iscsi_destroy_context(iscsilun->iscsi); 2203 } 2204 g_free(bs->opaque); 2205 bs->opaque = NULL; 2206 bdrv_unref(bs); 2207 return ret; 2208 } 2209 2210 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2211 { 2212 IscsiLun *iscsilun = bs->opaque; 2213 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2214 bdi->cluster_size = iscsilun->cluster_size; 2215 return 0; 2216 } 2217 2218 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2219 Error **errp) 2220 { 2221 IscsiLun *iscsilun = bs->opaque; 2222 iscsi_allocmap_invalidate(iscsilun); 2223 } 2224 2225 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2226 BdrvChild *src, 2227 uint64_t src_offset, 2228 BdrvChild *dst, 2229 uint64_t dst_offset, 2230 uint64_t bytes, 2231 BdrvRequestFlags read_flags, 2232 BdrvRequestFlags write_flags) 2233 { 2234 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2235 read_flags, write_flags); 2236 } 2237 2238 static struct scsi_task *iscsi_xcopy_task(int param_len) 2239 { 2240 struct scsi_task *task; 2241 2242 task = g_new0(struct scsi_task, 1); 2243 2244 task->cdb[0] = EXTENDED_COPY; 2245 task->cdb[10] = (param_len >> 24) & 0xFF; 2246 task->cdb[11] = (param_len >> 16) & 0xFF; 2247 task->cdb[12] = (param_len >> 8) & 0xFF; 2248 task->cdb[13] = param_len & 0xFF; 2249 task->cdb_size = 16; 2250 task->xfer_dir = SCSI_XFER_WRITE; 2251 task->expxferlen = param_len; 2252 2253 return task; 2254 } 2255 2256 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2257 { 2258 struct scsi_inquiry_device_designator *dd = lun->dd; 2259 2260 memset(desc, 0, 32); 2261 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2262 desc[4] = dd->code_set; 2263 desc[5] = (dd->designator_type & 0xF) 2264 | ((dd->association & 3) << 4); 2265 desc[7] = dd->designator_length; 2266 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2267 2268 desc[28] = 0; 2269 desc[29] = (lun->block_size >> 16) & 0xFF; 2270 desc[30] = (lun->block_size >> 8) & 0xFF; 2271 desc[31] = lun->block_size & 0xFF; 2272 } 2273 2274 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2275 int dst_index) 2276 { 2277 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2278 hdr[1] = ((dc << 1) | cat) & 0xFF; 2279 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2280 /* don't account for the first 4 bytes in descriptor header*/ 2281 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2282 hdr[4] = (src_index >> 8) & 0xFF; 2283 hdr[5] = src_index & 0xFF; 2284 hdr[6] = (dst_index >> 8) & 0xFF; 2285 hdr[7] = dst_index & 0xFF; 2286 } 2287 2288 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2289 int src_index, int dst_index, int num_blks, 2290 uint64_t src_lba, uint64_t dst_lba) 2291 { 2292 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2293 2294 /* The caller should verify the request size */ 2295 assert(num_blks < 65536); 2296 desc[10] = (num_blks >> 8) & 0xFF; 2297 desc[11] = num_blks & 0xFF; 2298 desc[12] = (src_lba >> 56) & 0xFF; 2299 desc[13] = (src_lba >> 48) & 0xFF; 2300 desc[14] = (src_lba >> 40) & 0xFF; 2301 desc[15] = (src_lba >> 32) & 0xFF; 2302 desc[16] = (src_lba >> 24) & 0xFF; 2303 desc[17] = (src_lba >> 16) & 0xFF; 2304 desc[18] = (src_lba >> 8) & 0xFF; 2305 desc[19] = src_lba & 0xFF; 2306 desc[20] = (dst_lba >> 56) & 0xFF; 2307 desc[21] = (dst_lba >> 48) & 0xFF; 2308 desc[22] = (dst_lba >> 40) & 0xFF; 2309 desc[23] = (dst_lba >> 32) & 0xFF; 2310 desc[24] = (dst_lba >> 24) & 0xFF; 2311 desc[25] = (dst_lba >> 16) & 0xFF; 2312 desc[26] = (dst_lba >> 8) & 0xFF; 2313 desc[27] = dst_lba & 0xFF; 2314 } 2315 2316 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2317 int list_id_usage, int prio, 2318 int tgt_desc_len, 2319 int seg_desc_len, int inline_data_len) 2320 { 2321 buf[0] = list_id; 2322 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2323 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2324 buf[3] = tgt_desc_len & 0xFF; 2325 buf[8] = (seg_desc_len >> 24) & 0xFF; 2326 buf[9] = (seg_desc_len >> 16) & 0xFF; 2327 buf[10] = (seg_desc_len >> 8) & 0xFF; 2328 buf[11] = seg_desc_len & 0xFF; 2329 buf[12] = (inline_data_len >> 24) & 0xFF; 2330 buf[13] = (inline_data_len >> 16) & 0xFF; 2331 buf[14] = (inline_data_len >> 8) & 0xFF; 2332 buf[15] = inline_data_len & 0xFF; 2333 } 2334 2335 static void iscsi_xcopy_data(struct iscsi_data *data, 2336 IscsiLun *src, int64_t src_lba, 2337 IscsiLun *dst, int64_t dst_lba, 2338 uint16_t num_blocks) 2339 { 2340 uint8_t *buf; 2341 const int src_offset = XCOPY_DESC_OFFSET; 2342 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2343 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2344 2345 data->size = XCOPY_DESC_OFFSET + 2346 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2347 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2348 data->data = g_malloc0(data->size); 2349 buf = data->data; 2350 2351 /* Initialise the parameter list header */ 2352 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2353 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2354 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2355 0); 2356 2357 /* Initialise CSCD list with one src + one dst descriptor */ 2358 iscsi_populate_target_desc(&buf[src_offset], src); 2359 iscsi_populate_target_desc(&buf[dst_offset], dst); 2360 2361 /* Initialise one segment descriptor */ 2362 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2363 src_lba, dst_lba); 2364 } 2365 2366 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2367 BdrvChild *src, 2368 uint64_t src_offset, 2369 BdrvChild *dst, 2370 uint64_t dst_offset, 2371 uint64_t bytes, 2372 BdrvRequestFlags read_flags, 2373 BdrvRequestFlags write_flags) 2374 { 2375 IscsiLun *dst_lun = dst->bs->opaque; 2376 IscsiLun *src_lun; 2377 struct IscsiTask iscsi_task; 2378 struct iscsi_data data; 2379 int r = 0; 2380 int block_size; 2381 2382 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2383 return -ENOTSUP; 2384 } 2385 src_lun = src->bs->opaque; 2386 2387 if (!src_lun->dd || !dst_lun->dd) { 2388 return -ENOTSUP; 2389 } 2390 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2391 return -ENOTSUP; 2392 } 2393 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2394 return -ENOTSUP; 2395 } 2396 if (dst_lun->block_size != src_lun->block_size || 2397 !dst_lun->block_size) { 2398 return -ENOTSUP; 2399 } 2400 2401 block_size = dst_lun->block_size; 2402 if (bytes / block_size > 65535) { 2403 return -ENOTSUP; 2404 } 2405 2406 iscsi_xcopy_data(&data, 2407 src_lun, src_offset / block_size, 2408 dst_lun, dst_offset / block_size, 2409 bytes / block_size); 2410 2411 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2412 2413 qemu_mutex_lock(&dst_lun->mutex); 2414 iscsi_task.task = iscsi_xcopy_task(data.size); 2415 retry: 2416 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2417 iscsi_task.task, iscsi_co_generic_cb, 2418 &data, 2419 &iscsi_task) != 0) { 2420 r = -EIO; 2421 goto out_unlock; 2422 } 2423 2424 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2425 2426 if (iscsi_task.do_retry) { 2427 iscsi_task.complete = 0; 2428 goto retry; 2429 } 2430 2431 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2432 r = iscsi_task.err_code; 2433 goto out_unlock; 2434 } 2435 2436 out_unlock: 2437 2438 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2439 g_free(iscsi_task.task); 2440 qemu_mutex_unlock(&dst_lun->mutex); 2441 g_free(iscsi_task.err_str); 2442 return r; 2443 } 2444 2445 static QemuOptsList iscsi_create_opts = { 2446 .name = "iscsi-create-opts", 2447 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2448 .desc = { 2449 { 2450 .name = BLOCK_OPT_SIZE, 2451 .type = QEMU_OPT_SIZE, 2452 .help = "Virtual disk size" 2453 }, 2454 { /* end of list */ } 2455 } 2456 }; 2457 2458 static const char *const iscsi_strong_runtime_opts[] = { 2459 "transport", 2460 "portal", 2461 "target", 2462 "user", 2463 "password", 2464 "password-secret", 2465 "lun", 2466 "initiator-name", 2467 "header-digest", 2468 2469 NULL 2470 }; 2471 2472 static BlockDriver bdrv_iscsi = { 2473 .format_name = "iscsi", 2474 .protocol_name = "iscsi", 2475 2476 .instance_size = sizeof(IscsiLun), 2477 .bdrv_parse_filename = iscsi_parse_filename, 2478 .bdrv_file_open = iscsi_open, 2479 .bdrv_close = iscsi_close, 2480 .bdrv_co_create_opts = iscsi_co_create_opts, 2481 .create_opts = &iscsi_create_opts, 2482 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2483 .bdrv_reopen_commit = iscsi_reopen_commit, 2484 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2485 2486 .bdrv_getlength = iscsi_getlength, 2487 .bdrv_get_info = iscsi_get_info, 2488 .bdrv_co_truncate = iscsi_co_truncate, 2489 .bdrv_refresh_limits = iscsi_refresh_limits, 2490 2491 .bdrv_co_block_status = iscsi_co_block_status, 2492 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2493 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2494 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2495 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2496 .bdrv_co_readv = iscsi_co_readv, 2497 .bdrv_co_writev = iscsi_co_writev, 2498 .bdrv_co_flush_to_disk = iscsi_co_flush, 2499 2500 #ifdef __linux__ 2501 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2502 #endif 2503 2504 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2505 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2506 2507 .strong_runtime_opts = iscsi_strong_runtime_opts, 2508 }; 2509 2510 #if LIBISCSI_API_VERSION >= (20160603) 2511 static BlockDriver bdrv_iser = { 2512 .format_name = "iser", 2513 .protocol_name = "iser", 2514 2515 .instance_size = sizeof(IscsiLun), 2516 .bdrv_parse_filename = iscsi_parse_filename, 2517 .bdrv_file_open = iscsi_open, 2518 .bdrv_close = iscsi_close, 2519 .bdrv_co_create_opts = iscsi_co_create_opts, 2520 .create_opts = &iscsi_create_opts, 2521 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2522 .bdrv_reopen_commit = iscsi_reopen_commit, 2523 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2524 2525 .bdrv_getlength = iscsi_getlength, 2526 .bdrv_get_info = iscsi_get_info, 2527 .bdrv_co_truncate = iscsi_co_truncate, 2528 .bdrv_refresh_limits = iscsi_refresh_limits, 2529 2530 .bdrv_co_block_status = iscsi_co_block_status, 2531 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2532 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2533 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2534 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2535 .bdrv_co_readv = iscsi_co_readv, 2536 .bdrv_co_writev = iscsi_co_writev, 2537 .bdrv_co_flush_to_disk = iscsi_co_flush, 2538 2539 #ifdef __linux__ 2540 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2541 #endif 2542 2543 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2544 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2545 2546 .strong_runtime_opts = iscsi_strong_runtime_opts, 2547 }; 2548 #endif 2549 2550 static void iscsi_block_init(void) 2551 { 2552 bdrv_register(&bdrv_iscsi); 2553 #if LIBISCSI_API_VERSION >= (20160603) 2554 bdrv_register(&bdrv_iser); 2555 #endif 2556 } 2557 2558 block_init(iscsi_block_init); 2559