1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2017 Peter Lieven <pl@kamp.de> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 28 #include <poll.h> 29 #include <math.h> 30 #include <arpa/inet.h> 31 #include "qemu-common.h" 32 #include "qemu/config-file.h" 33 #include "qemu/error-report.h" 34 #include "qemu/bitops.h" 35 #include "qemu/bitmap.h" 36 #include "block/block_int.h" 37 #include "block/qdict.h" 38 #include "scsi/constants.h" 39 #include "qemu/iov.h" 40 #include "qemu/module.h" 41 #include "qemu/option.h" 42 #include "qemu/uuid.h" 43 #include "qapi/error.h" 44 #include "qapi/qapi-commands-misc.h" 45 #include "qapi/qmp/qdict.h" 46 #include "qapi/qmp/qstring.h" 47 #include "crypto/secret.h" 48 #include "scsi/utils.h" 49 #include "trace.h" 50 51 /* Conflict between scsi/utils.h and libiscsi! :( */ 52 #define SCSI_XFER_NONE ISCSI_XFER_NONE 53 #include <iscsi/iscsi.h> 54 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */ 55 #include <iscsi/scsi-lowlevel.h> 56 #undef inline 57 #undef SCSI_XFER_NONE 58 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE); 59 60 #ifdef __linux__ 61 #include <scsi/sg.h> 62 #endif 63 64 typedef struct IscsiLun { 65 struct iscsi_context *iscsi; 66 AioContext *aio_context; 67 int lun; 68 enum scsi_inquiry_peripheral_device_type type; 69 int block_size; 70 uint64_t num_blocks; 71 int events; 72 QEMUTimer *nop_timer; 73 QEMUTimer *event_timer; 74 QemuMutex mutex; 75 struct scsi_inquiry_logical_block_provisioning lbp; 76 struct scsi_inquiry_block_limits bl; 77 struct scsi_inquiry_device_designator *dd; 78 unsigned char *zeroblock; 79 /* The allocmap tracks which clusters (pages) on the iSCSI target are 80 * allocated and which are not. In case a target returns zeros for 81 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 82 * of reading zeros over the wire if a read request falls within an 83 * unallocated block. As there are 3 possible states we need 2 bitmaps to 84 * track. allocmap_valid keeps track if QEMU's information about a page is 85 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 86 * valid information about a page the corresponding allocmap entry should be 87 * switched to unallocated as well to force a new lookup of the allocation 88 * status as lookups are generally skipped if a page is suspect to be 89 * allocated. If a iSCSI target is opened with cache.direct = on the 90 * allocmap_valid does not exist turning all cached information invalid so 91 * that a fresh lookup is made for any page even if allocmap entry returns 92 * it's unallocated. */ 93 unsigned long *allocmap; 94 unsigned long *allocmap_valid; 95 long allocmap_size; 96 int cluster_size; 97 bool use_16_for_rw; 98 bool write_protected; 99 bool lbpme; 100 bool lbprz; 101 bool dpofua; 102 bool has_write_same; 103 bool request_timed_out; 104 } IscsiLun; 105 106 typedef struct IscsiTask { 107 int status; 108 int complete; 109 int retries; 110 int do_retry; 111 struct scsi_task *task; 112 Coroutine *co; 113 IscsiLun *iscsilun; 114 QEMUTimer retry_timer; 115 int err_code; 116 char *err_str; 117 } IscsiTask; 118 119 typedef struct IscsiAIOCB { 120 BlockAIOCB common; 121 QEMUBH *bh; 122 IscsiLun *iscsilun; 123 struct scsi_task *task; 124 int status; 125 int64_t sector_num; 126 int nb_sectors; 127 int ret; 128 #ifdef __linux__ 129 sg_io_hdr_t *ioh; 130 #endif 131 bool cancelled; 132 } IscsiAIOCB; 133 134 /* libiscsi uses time_t so its enough to process events every second */ 135 #define EVENT_INTERVAL 1000 136 #define NOP_INTERVAL 5000 137 #define MAX_NOP_FAILURES 3 138 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 139 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 140 141 /* this threshold is a trade-off knob to choose between 142 * the potential additional overhead of an extra GET_LBA_STATUS request 143 * vs. unnecessarily reading a lot of zero sectors over the wire. 144 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 145 * sectors we check the allocation status of the area covered by the 146 * request first if the allocationmap indicates that the area might be 147 * unallocated. */ 148 #define ISCSI_CHECKALLOC_THRES 64 149 150 #ifdef __linux__ 151 152 static void 153 iscsi_bh_cb(void *p) 154 { 155 IscsiAIOCB *acb = p; 156 157 qemu_bh_delete(acb->bh); 158 159 acb->common.cb(acb->common.opaque, acb->status); 160 161 if (acb->task != NULL) { 162 scsi_free_scsi_task(acb->task); 163 acb->task = NULL; 164 } 165 166 qemu_aio_unref(acb); 167 } 168 169 static void 170 iscsi_schedule_bh(IscsiAIOCB *acb) 171 { 172 if (acb->bh) { 173 return; 174 } 175 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 176 qemu_bh_schedule(acb->bh); 177 } 178 179 #endif 180 181 static void iscsi_co_generic_bh_cb(void *opaque) 182 { 183 struct IscsiTask *iTask = opaque; 184 185 iTask->complete = 1; 186 aio_co_wake(iTask->co); 187 } 188 189 static void iscsi_retry_timer_expired(void *opaque) 190 { 191 struct IscsiTask *iTask = opaque; 192 iTask->complete = 1; 193 if (iTask->co) { 194 aio_co_wake(iTask->co); 195 } 196 } 197 198 static inline unsigned exp_random(double mean) 199 { 200 return -mean * log((double)rand() / RAND_MAX); 201 } 202 203 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 204 * libiscsi 1.10.0, together with other constants we need. Use it as 205 * a hint that we have to define them ourselves if needed, to keep the 206 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 207 * the test because SCSI_STATUS_* is an enum. 208 * 209 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 210 * an enum, check against the LIBISCSI_API_VERSION macro, which was 211 * introduced in 1.11.0. If it is present, there is no need to define 212 * anything. 213 */ 214 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 215 !defined(LIBISCSI_API_VERSION) 216 #define SCSI_STATUS_TASK_SET_FULL 0x28 217 #define SCSI_STATUS_TIMEOUT 0x0f000002 218 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 219 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 220 #endif 221 222 #ifndef LIBISCSI_API_VERSION 223 #define LIBISCSI_API_VERSION 20130701 224 #endif 225 226 static int iscsi_translate_sense(struct scsi_sense *sense) 227 { 228 return scsi_sense_to_errno(sense->key, 229 (sense->ascq & 0xFF00) >> 8, 230 sense->ascq & 0xFF); 231 } 232 233 /* Called (via iscsi_service) with QemuMutex held. */ 234 static void 235 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 236 void *command_data, void *opaque) 237 { 238 struct IscsiTask *iTask = opaque; 239 struct scsi_task *task = command_data; 240 241 iTask->status = status; 242 iTask->do_retry = 0; 243 iTask->task = task; 244 245 if (status != SCSI_STATUS_GOOD) { 246 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 247 if (status == SCSI_STATUS_BUSY || 248 status == SCSI_STATUS_TIMEOUT || 249 status == SCSI_STATUS_TASK_SET_FULL) { 250 unsigned retry_time = 251 exp_random(iscsi_retry_times[iTask->retries - 1]); 252 if (status == SCSI_STATUS_TIMEOUT) { 253 /* make sure the request is rescheduled AFTER the 254 * reconnect is initiated */ 255 retry_time = EVENT_INTERVAL * 2; 256 iTask->iscsilun->request_timed_out = true; 257 } 258 error_report("iSCSI Busy/TaskSetFull/TimeOut" 259 " (retry #%u in %u ms): %s", 260 iTask->retries, retry_time, 261 iscsi_get_error(iscsi)); 262 aio_timer_init(iTask->iscsilun->aio_context, 263 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 264 SCALE_MS, iscsi_retry_timer_expired, iTask); 265 timer_mod(&iTask->retry_timer, 266 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 267 iTask->do_retry = 1; 268 } 269 } else if (status == SCSI_STATUS_CHECK_CONDITION) { 270 int error = iscsi_translate_sense(&task->sense); 271 if (error == EAGAIN) { 272 error_report("iSCSI CheckCondition: %s", 273 iscsi_get_error(iscsi)); 274 iTask->do_retry = 1; 275 } else { 276 iTask->err_code = -error; 277 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 278 } 279 } 280 } 281 282 if (iTask->co) { 283 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 284 iscsi_co_generic_bh_cb, iTask); 285 } else { 286 iTask->complete = 1; 287 } 288 } 289 290 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 291 { 292 *iTask = (struct IscsiTask) { 293 .co = qemu_coroutine_self(), 294 .iscsilun = iscsilun, 295 }; 296 } 297 298 #ifdef __linux__ 299 300 /* Called (via iscsi_service) with QemuMutex held. */ 301 static void 302 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 303 void *private_data) 304 { 305 IscsiAIOCB *acb = private_data; 306 307 /* If the command callback hasn't been called yet, drop the task */ 308 if (!acb->bh) { 309 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 310 iscsi_scsi_cancel_task(iscsi, acb->task); 311 } 312 313 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 314 } 315 316 static void 317 iscsi_aio_cancel(BlockAIOCB *blockacb) 318 { 319 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 320 IscsiLun *iscsilun = acb->iscsilun; 321 322 qemu_mutex_lock(&iscsilun->mutex); 323 324 /* If it was cancelled or completed already, our work is done here */ 325 if (acb->cancelled || acb->status != -EINPROGRESS) { 326 qemu_mutex_unlock(&iscsilun->mutex); 327 return; 328 } 329 330 acb->cancelled = true; 331 332 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 333 334 /* send a task mgmt call to the target to cancel the task on the target */ 335 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 336 iscsi_abort_task_cb, acb) < 0) { 337 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 338 } 339 340 qemu_mutex_unlock(&iscsilun->mutex); 341 } 342 343 static const AIOCBInfo iscsi_aiocb_info = { 344 .aiocb_size = sizeof(IscsiAIOCB), 345 .cancel_async = iscsi_aio_cancel, 346 }; 347 348 #endif 349 350 static void iscsi_process_read(void *arg); 351 static void iscsi_process_write(void *arg); 352 353 /* Called with QemuMutex held. */ 354 static void 355 iscsi_set_events(IscsiLun *iscsilun) 356 { 357 struct iscsi_context *iscsi = iscsilun->iscsi; 358 int ev = iscsi_which_events(iscsi); 359 360 if (ev != iscsilun->events) { 361 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 362 false, 363 (ev & POLLIN) ? iscsi_process_read : NULL, 364 (ev & POLLOUT) ? iscsi_process_write : NULL, 365 NULL, 366 iscsilun); 367 iscsilun->events = ev; 368 } 369 } 370 371 static void iscsi_timed_check_events(void *opaque) 372 { 373 IscsiLun *iscsilun = opaque; 374 375 qemu_mutex_lock(&iscsilun->mutex); 376 377 /* check for timed out requests */ 378 iscsi_service(iscsilun->iscsi, 0); 379 380 if (iscsilun->request_timed_out) { 381 iscsilun->request_timed_out = false; 382 iscsi_reconnect(iscsilun->iscsi); 383 } 384 385 /* newer versions of libiscsi may return zero events. Ensure we are able 386 * to return to service once this situation changes. */ 387 iscsi_set_events(iscsilun); 388 389 qemu_mutex_unlock(&iscsilun->mutex); 390 391 timer_mod(iscsilun->event_timer, 392 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 393 } 394 395 static void 396 iscsi_process_read(void *arg) 397 { 398 IscsiLun *iscsilun = arg; 399 struct iscsi_context *iscsi = iscsilun->iscsi; 400 401 qemu_mutex_lock(&iscsilun->mutex); 402 iscsi_service(iscsi, POLLIN); 403 iscsi_set_events(iscsilun); 404 qemu_mutex_unlock(&iscsilun->mutex); 405 } 406 407 static void 408 iscsi_process_write(void *arg) 409 { 410 IscsiLun *iscsilun = arg; 411 struct iscsi_context *iscsi = iscsilun->iscsi; 412 413 qemu_mutex_lock(&iscsilun->mutex); 414 iscsi_service(iscsi, POLLOUT); 415 iscsi_set_events(iscsilun); 416 qemu_mutex_unlock(&iscsilun->mutex); 417 } 418 419 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 420 { 421 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 422 } 423 424 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 425 { 426 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 427 } 428 429 static bool is_byte_request_lun_aligned(int64_t offset, int count, 430 IscsiLun *iscsilun) 431 { 432 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 433 error_report("iSCSI misaligned request: " 434 "iscsilun->block_size %u, offset %" PRIi64 435 ", count %d", 436 iscsilun->block_size, offset, count); 437 return false; 438 } 439 return true; 440 } 441 442 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 443 IscsiLun *iscsilun) 444 { 445 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 446 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 447 nb_sectors << BDRV_SECTOR_BITS, 448 iscsilun); 449 } 450 451 static void iscsi_allocmap_free(IscsiLun *iscsilun) 452 { 453 g_free(iscsilun->allocmap); 454 g_free(iscsilun->allocmap_valid); 455 iscsilun->allocmap = NULL; 456 iscsilun->allocmap_valid = NULL; 457 } 458 459 460 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 461 { 462 iscsi_allocmap_free(iscsilun); 463 464 assert(iscsilun->cluster_size); 465 iscsilun->allocmap_size = 466 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 467 iscsilun->cluster_size); 468 469 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 470 if (!iscsilun->allocmap) { 471 return -ENOMEM; 472 } 473 474 if (open_flags & BDRV_O_NOCACHE) { 475 /* when cache.direct = on all allocmap entries are 476 * treated as invalid to force a relookup of the block 477 * status on every read request */ 478 return 0; 479 } 480 481 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 482 if (!iscsilun->allocmap_valid) { 483 /* if we are under memory pressure free the allocmap as well */ 484 iscsi_allocmap_free(iscsilun); 485 return -ENOMEM; 486 } 487 488 return 0; 489 } 490 491 static void 492 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 493 int64_t bytes, bool allocated, bool valid) 494 { 495 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 496 497 if (iscsilun->allocmap == NULL) { 498 return; 499 } 500 /* expand to entirely contain all affected clusters */ 501 assert(iscsilun->cluster_size); 502 cl_num_expanded = offset / iscsilun->cluster_size; 503 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 504 iscsilun->cluster_size) - cl_num_expanded; 505 /* shrink to touch only completely contained clusters */ 506 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 507 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 508 if (allocated) { 509 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 510 } else { 511 if (nb_cls_shrunk > 0) { 512 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 513 } 514 } 515 516 if (iscsilun->allocmap_valid == NULL) { 517 return; 518 } 519 if (valid) { 520 if (nb_cls_shrunk > 0) { 521 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 522 } 523 } else { 524 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 525 nb_cls_expanded); 526 } 527 } 528 529 static void 530 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 531 int64_t bytes) 532 { 533 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 534 } 535 536 static void 537 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 538 int64_t bytes) 539 { 540 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 541 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 542 */ 543 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 544 } 545 546 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 547 int64_t bytes) 548 { 549 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 550 } 551 552 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 553 { 554 if (iscsilun->allocmap) { 555 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 556 } 557 if (iscsilun->allocmap_valid) { 558 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 559 } 560 } 561 562 static inline bool 563 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 564 int64_t bytes) 565 { 566 unsigned long size; 567 if (iscsilun->allocmap == NULL) { 568 return true; 569 } 570 assert(iscsilun->cluster_size); 571 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 572 return !(find_next_bit(iscsilun->allocmap, size, 573 offset / iscsilun->cluster_size) == size); 574 } 575 576 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 577 int64_t offset, int64_t bytes) 578 { 579 unsigned long size; 580 if (iscsilun->allocmap_valid == NULL) { 581 return false; 582 } 583 assert(iscsilun->cluster_size); 584 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 585 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 586 offset / iscsilun->cluster_size) == size); 587 } 588 589 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 590 IscsiLun *iscsilun) 591 { 592 while (!iTask->complete) { 593 iscsi_set_events(iscsilun); 594 qemu_mutex_unlock(&iscsilun->mutex); 595 qemu_coroutine_yield(); 596 qemu_mutex_lock(&iscsilun->mutex); 597 } 598 } 599 600 static int coroutine_fn 601 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 602 QEMUIOVector *iov, int flags) 603 { 604 IscsiLun *iscsilun = bs->opaque; 605 struct IscsiTask iTask; 606 uint64_t lba; 607 uint32_t num_sectors; 608 bool fua = flags & BDRV_REQ_FUA; 609 int r = 0; 610 611 if (fua) { 612 assert(iscsilun->dpofua); 613 } 614 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 615 return -EINVAL; 616 } 617 618 if (bs->bl.max_transfer) { 619 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 620 } 621 622 lba = sector_qemu2lun(sector_num, iscsilun); 623 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 624 iscsi_co_init_iscsitask(iscsilun, &iTask); 625 qemu_mutex_lock(&iscsilun->mutex); 626 retry: 627 if (iscsilun->use_16_for_rw) { 628 #if LIBISCSI_API_VERSION >= (20160603) 629 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 630 NULL, num_sectors * iscsilun->block_size, 631 iscsilun->block_size, 0, 0, fua, 0, 0, 632 iscsi_co_generic_cb, &iTask, 633 (struct scsi_iovec *)iov->iov, iov->niov); 634 } else { 635 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 636 NULL, num_sectors * iscsilun->block_size, 637 iscsilun->block_size, 0, 0, fua, 0, 0, 638 iscsi_co_generic_cb, &iTask, 639 (struct scsi_iovec *)iov->iov, iov->niov); 640 } 641 #else 642 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 643 NULL, num_sectors * iscsilun->block_size, 644 iscsilun->block_size, 0, 0, fua, 0, 0, 645 iscsi_co_generic_cb, &iTask); 646 } else { 647 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 648 NULL, num_sectors * iscsilun->block_size, 649 iscsilun->block_size, 0, 0, fua, 0, 0, 650 iscsi_co_generic_cb, &iTask); 651 } 652 #endif 653 if (iTask.task == NULL) { 654 qemu_mutex_unlock(&iscsilun->mutex); 655 return -ENOMEM; 656 } 657 #if LIBISCSI_API_VERSION < (20160603) 658 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 659 iov->niov); 660 #endif 661 iscsi_co_wait_for_task(&iTask, iscsilun); 662 663 if (iTask.task != NULL) { 664 scsi_free_scsi_task(iTask.task); 665 iTask.task = NULL; 666 } 667 668 if (iTask.do_retry) { 669 iTask.complete = 0; 670 goto retry; 671 } 672 673 if (iTask.status != SCSI_STATUS_GOOD) { 674 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 675 nb_sectors * BDRV_SECTOR_SIZE); 676 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 677 iTask.err_str); 678 r = iTask.err_code; 679 goto out_unlock; 680 } 681 682 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 683 nb_sectors * BDRV_SECTOR_SIZE); 684 685 out_unlock: 686 qemu_mutex_unlock(&iscsilun->mutex); 687 g_free(iTask.err_str); 688 return r; 689 } 690 691 692 693 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 694 bool want_zero, int64_t offset, 695 int64_t bytes, int64_t *pnum, 696 int64_t *map, 697 BlockDriverState **file) 698 { 699 IscsiLun *iscsilun = bs->opaque; 700 struct scsi_get_lba_status *lbas = NULL; 701 struct scsi_lba_status_descriptor *lbasd = NULL; 702 struct IscsiTask iTask; 703 uint64_t lba; 704 int ret; 705 706 iscsi_co_init_iscsitask(iscsilun, &iTask); 707 708 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 709 710 /* default to all sectors allocated */ 711 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 712 if (map) { 713 *map = offset; 714 } 715 *pnum = bytes; 716 717 /* LUN does not support logical block provisioning */ 718 if (!iscsilun->lbpme) { 719 goto out; 720 } 721 722 lba = offset / iscsilun->block_size; 723 724 qemu_mutex_lock(&iscsilun->mutex); 725 retry: 726 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 727 lba, 8 + 16, iscsi_co_generic_cb, 728 &iTask) == NULL) { 729 ret = -ENOMEM; 730 goto out_unlock; 731 } 732 iscsi_co_wait_for_task(&iTask, iscsilun); 733 734 if (iTask.do_retry) { 735 if (iTask.task != NULL) { 736 scsi_free_scsi_task(iTask.task); 737 iTask.task = NULL; 738 } 739 iTask.complete = 0; 740 goto retry; 741 } 742 743 if (iTask.status != SCSI_STATUS_GOOD) { 744 /* in case the get_lba_status_callout fails (i.e. 745 * because the device is busy or the cmd is not 746 * supported) we pretend all blocks are allocated 747 * for backwards compatibility */ 748 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 749 lba, iTask.err_str); 750 goto out_unlock; 751 } 752 753 lbas = scsi_datain_unmarshall(iTask.task); 754 if (lbas == NULL) { 755 ret = -EIO; 756 goto out_unlock; 757 } 758 759 lbasd = &lbas->descriptors[0]; 760 761 if (lba != lbasd->lba) { 762 ret = -EIO; 763 goto out_unlock; 764 } 765 766 *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size; 767 768 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 769 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 770 ret &= ~BDRV_BLOCK_DATA; 771 if (iscsilun->lbprz) { 772 ret |= BDRV_BLOCK_ZERO; 773 } 774 } 775 776 if (ret & BDRV_BLOCK_ZERO) { 777 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 778 } else { 779 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 780 } 781 782 if (*pnum > bytes) { 783 *pnum = bytes; 784 } 785 out_unlock: 786 qemu_mutex_unlock(&iscsilun->mutex); 787 g_free(iTask.err_str); 788 out: 789 if (iTask.task != NULL) { 790 scsi_free_scsi_task(iTask.task); 791 } 792 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 793 *file = bs; 794 } 795 return ret; 796 } 797 798 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 799 int64_t sector_num, int nb_sectors, 800 QEMUIOVector *iov) 801 { 802 IscsiLun *iscsilun = bs->opaque; 803 struct IscsiTask iTask; 804 uint64_t lba; 805 uint32_t num_sectors; 806 int r = 0; 807 808 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 809 return -EINVAL; 810 } 811 812 if (bs->bl.max_transfer) { 813 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 814 } 815 816 /* if cache.direct is off and we have a valid entry in our allocation map 817 * we can skip checking the block status and directly return zeroes if 818 * the request falls within an unallocated area */ 819 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 820 nb_sectors * BDRV_SECTOR_SIZE) && 821 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 822 nb_sectors * BDRV_SECTOR_SIZE)) { 823 qemu_iovec_memset(iov, 0, 0x00, iov->size); 824 return 0; 825 } 826 827 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 828 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 829 nb_sectors * BDRV_SECTOR_SIZE) && 830 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 831 nb_sectors * BDRV_SECTOR_SIZE)) { 832 int64_t pnum; 833 /* check the block status from the beginning of the cluster 834 * containing the start sector */ 835 int64_t head; 836 int ret; 837 838 assert(iscsilun->cluster_size); 839 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 840 ret = iscsi_co_block_status(bs, true, 841 sector_num * BDRV_SECTOR_SIZE - head, 842 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 843 if (ret < 0) { 844 return ret; 845 } 846 /* if the whole request falls into an unallocated area we can avoid 847 * reading and directly return zeroes instead */ 848 if (ret & BDRV_BLOCK_ZERO && 849 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 850 qemu_iovec_memset(iov, 0, 0x00, iov->size); 851 return 0; 852 } 853 } 854 855 lba = sector_qemu2lun(sector_num, iscsilun); 856 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 857 858 iscsi_co_init_iscsitask(iscsilun, &iTask); 859 qemu_mutex_lock(&iscsilun->mutex); 860 retry: 861 if (iscsilun->use_16_for_rw) { 862 #if LIBISCSI_API_VERSION >= (20160603) 863 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 864 num_sectors * iscsilun->block_size, 865 iscsilun->block_size, 0, 0, 0, 0, 0, 866 iscsi_co_generic_cb, &iTask, 867 (struct scsi_iovec *)iov->iov, iov->niov); 868 } else { 869 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 870 num_sectors * iscsilun->block_size, 871 iscsilun->block_size, 872 0, 0, 0, 0, 0, 873 iscsi_co_generic_cb, &iTask, 874 (struct scsi_iovec *)iov->iov, iov->niov); 875 } 876 #else 877 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 878 num_sectors * iscsilun->block_size, 879 iscsilun->block_size, 0, 0, 0, 0, 0, 880 iscsi_co_generic_cb, &iTask); 881 } else { 882 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 883 num_sectors * iscsilun->block_size, 884 iscsilun->block_size, 885 0, 0, 0, 0, 0, 886 iscsi_co_generic_cb, &iTask); 887 } 888 #endif 889 if (iTask.task == NULL) { 890 qemu_mutex_unlock(&iscsilun->mutex); 891 return -ENOMEM; 892 } 893 #if LIBISCSI_API_VERSION < (20160603) 894 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 895 #endif 896 897 iscsi_co_wait_for_task(&iTask, iscsilun); 898 if (iTask.task != NULL) { 899 scsi_free_scsi_task(iTask.task); 900 iTask.task = NULL; 901 } 902 903 if (iTask.do_retry) { 904 iTask.complete = 0; 905 goto retry; 906 } 907 908 if (iTask.status != SCSI_STATUS_GOOD) { 909 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 910 lba, iTask.err_str); 911 r = iTask.err_code; 912 } 913 914 qemu_mutex_unlock(&iscsilun->mutex); 915 g_free(iTask.err_str); 916 return r; 917 } 918 919 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 920 { 921 IscsiLun *iscsilun = bs->opaque; 922 struct IscsiTask iTask; 923 int r = 0; 924 925 iscsi_co_init_iscsitask(iscsilun, &iTask); 926 qemu_mutex_lock(&iscsilun->mutex); 927 retry: 928 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 929 0, iscsi_co_generic_cb, &iTask) == NULL) { 930 qemu_mutex_unlock(&iscsilun->mutex); 931 return -ENOMEM; 932 } 933 934 iscsi_co_wait_for_task(&iTask, iscsilun); 935 936 if (iTask.task != NULL) { 937 scsi_free_scsi_task(iTask.task); 938 iTask.task = NULL; 939 } 940 941 if (iTask.do_retry) { 942 iTask.complete = 0; 943 goto retry; 944 } 945 946 if (iTask.status != SCSI_STATUS_GOOD) { 947 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 948 r = iTask.err_code; 949 } 950 951 qemu_mutex_unlock(&iscsilun->mutex); 952 g_free(iTask.err_str); 953 return r; 954 } 955 956 #ifdef __linux__ 957 /* Called (via iscsi_service) with QemuMutex held. */ 958 static void 959 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 960 void *command_data, void *opaque) 961 { 962 IscsiAIOCB *acb = opaque; 963 964 if (status == SCSI_STATUS_CANCELLED) { 965 if (!acb->bh) { 966 acb->status = -ECANCELED; 967 iscsi_schedule_bh(acb); 968 } 969 return; 970 } 971 972 acb->status = 0; 973 if (status < 0) { 974 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 975 iscsi_get_error(iscsi)); 976 acb->status = -iscsi_translate_sense(&acb->task->sense); 977 } 978 979 acb->ioh->driver_status = 0; 980 acb->ioh->host_status = 0; 981 acb->ioh->resid = 0; 982 acb->ioh->status = status; 983 984 #define SG_ERR_DRIVER_SENSE 0x08 985 986 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 987 int ss; 988 989 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 990 991 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 992 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 993 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 1131 iscsi_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, int bytes) 1144 { 1145 IscsiLun *iscsilun = bs->opaque; 1146 struct IscsiTask iTask; 1147 struct unmap_list list; 1148 int r = 0; 1149 1150 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1151 return -ENOTSUP; 1152 } 1153 1154 if (!iscsilun->lbp.lbpu) { 1155 /* UNMAP is not supported by the target */ 1156 return 0; 1157 } 1158 1159 list.lba = offset / iscsilun->block_size; 1160 list.num = bytes / iscsilun->block_size; 1161 1162 iscsi_co_init_iscsitask(iscsilun, &iTask); 1163 qemu_mutex_lock(&iscsilun->mutex); 1164 retry: 1165 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1166 iscsi_co_generic_cb, &iTask) == NULL) { 1167 r = -ENOMEM; 1168 goto out_unlock; 1169 } 1170 1171 iscsi_co_wait_for_task(&iTask, iscsilun); 1172 1173 if (iTask.task != NULL) { 1174 scsi_free_scsi_task(iTask.task); 1175 iTask.task = NULL; 1176 } 1177 1178 if (iTask.do_retry) { 1179 iTask.complete = 0; 1180 goto retry; 1181 } 1182 1183 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1184 1185 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1186 /* the target might fail with a check condition if it 1187 is not happy with the alignment of the UNMAP request 1188 we silently fail in this case */ 1189 goto out_unlock; 1190 } 1191 1192 if (iTask.status != SCSI_STATUS_GOOD) { 1193 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1194 list.lba, iTask.err_str); 1195 r = iTask.err_code; 1196 goto out_unlock; 1197 } 1198 1199 out_unlock: 1200 qemu_mutex_unlock(&iscsilun->mutex); 1201 g_free(iTask.err_str); 1202 return r; 1203 } 1204 1205 static int 1206 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1207 int bytes, BdrvRequestFlags flags) 1208 { 1209 IscsiLun *iscsilun = bs->opaque; 1210 struct IscsiTask iTask; 1211 uint64_t lba; 1212 uint32_t nb_blocks; 1213 bool use_16_for_ws = iscsilun->use_16_for_rw; 1214 int r = 0; 1215 1216 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1217 return -ENOTSUP; 1218 } 1219 1220 if (flags & BDRV_REQ_MAY_UNMAP) { 1221 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1222 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1223 use_16_for_ws = true; 1224 } 1225 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1226 /* WRITESAME16 with UNMAP is not supported by the target, 1227 * fall back and try WRITESAME10/16 without UNMAP */ 1228 flags &= ~BDRV_REQ_MAY_UNMAP; 1229 use_16_for_ws = iscsilun->use_16_for_rw; 1230 } 1231 } 1232 1233 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1234 /* WRITESAME without UNMAP is not supported by the target */ 1235 return -ENOTSUP; 1236 } 1237 1238 lba = offset / iscsilun->block_size; 1239 nb_blocks = bytes / iscsilun->block_size; 1240 1241 if (iscsilun->zeroblock == NULL) { 1242 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1243 if (iscsilun->zeroblock == NULL) { 1244 return -ENOMEM; 1245 } 1246 } 1247 1248 qemu_mutex_lock(&iscsilun->mutex); 1249 iscsi_co_init_iscsitask(iscsilun, &iTask); 1250 retry: 1251 if (use_16_for_ws) { 1252 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1253 iscsilun->zeroblock, iscsilun->block_size, 1254 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1255 0, 0, iscsi_co_generic_cb, &iTask); 1256 } else { 1257 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1258 iscsilun->zeroblock, iscsilun->block_size, 1259 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1260 0, 0, iscsi_co_generic_cb, &iTask); 1261 } 1262 if (iTask.task == NULL) { 1263 qemu_mutex_unlock(&iscsilun->mutex); 1264 return -ENOMEM; 1265 } 1266 1267 iscsi_co_wait_for_task(&iTask, iscsilun); 1268 1269 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1270 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1271 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1272 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1273 /* WRITE SAME is not supported by the target */ 1274 iscsilun->has_write_same = false; 1275 scsi_free_scsi_task(iTask.task); 1276 r = -ENOTSUP; 1277 goto out_unlock; 1278 } 1279 1280 if (iTask.task != NULL) { 1281 scsi_free_scsi_task(iTask.task); 1282 iTask.task = NULL; 1283 } 1284 1285 if (iTask.do_retry) { 1286 iTask.complete = 0; 1287 goto retry; 1288 } 1289 1290 if (iTask.status != SCSI_STATUS_GOOD) { 1291 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1292 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1293 lba, iTask.err_str); 1294 r = iTask.err_code; 1295 goto out_unlock; 1296 } 1297 1298 if (flags & BDRV_REQ_MAY_UNMAP) { 1299 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1300 } else { 1301 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1302 } 1303 1304 out_unlock: 1305 qemu_mutex_unlock(&iscsilun->mutex); 1306 g_free(iTask.err_str); 1307 return r; 1308 } 1309 1310 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1311 Error **errp) 1312 { 1313 const char *user = NULL; 1314 const char *password = NULL; 1315 const char *secretid; 1316 char *secret = NULL; 1317 1318 user = qemu_opt_get(opts, "user"); 1319 if (!user) { 1320 return; 1321 } 1322 1323 secretid = qemu_opt_get(opts, "password-secret"); 1324 password = qemu_opt_get(opts, "password"); 1325 if (secretid && password) { 1326 error_setg(errp, "'password' and 'password-secret' properties are " 1327 "mutually exclusive"); 1328 return; 1329 } 1330 if (secretid) { 1331 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1332 if (!secret) { 1333 return; 1334 } 1335 password = secret; 1336 } else if (!password) { 1337 error_setg(errp, "CHAP username specified but no password was given"); 1338 return; 1339 } 1340 1341 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1342 error_setg(errp, "Failed to set initiator username and password"); 1343 } 1344 1345 g_free(secret); 1346 } 1347 1348 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1349 Error **errp) 1350 { 1351 const char *digest = NULL; 1352 1353 digest = qemu_opt_get(opts, "header-digest"); 1354 if (!digest) { 1355 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1356 } else if (!strcmp(digest, "crc32c")) { 1357 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1358 } else if (!strcmp(digest, "none")) { 1359 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1360 } else if (!strcmp(digest, "crc32c-none")) { 1361 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1362 } else if (!strcmp(digest, "none-crc32c")) { 1363 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1364 } else { 1365 error_setg(errp, "Invalid header-digest setting : %s", digest); 1366 } 1367 } 1368 1369 static char *get_initiator_name(QemuOpts *opts) 1370 { 1371 const char *name; 1372 char *iscsi_name; 1373 UuidInfo *uuid_info; 1374 1375 name = qemu_opt_get(opts, "initiator-name"); 1376 if (name) { 1377 return g_strdup(name); 1378 } 1379 1380 uuid_info = qmp_query_uuid(NULL); 1381 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1382 name = qemu_get_vm_name(); 1383 } else { 1384 name = uuid_info->UUID; 1385 } 1386 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1387 name ? ":" : "", name ? name : ""); 1388 qapi_free_UuidInfo(uuid_info); 1389 return iscsi_name; 1390 } 1391 1392 static void iscsi_nop_timed_event(void *opaque) 1393 { 1394 IscsiLun *iscsilun = opaque; 1395 1396 qemu_mutex_lock(&iscsilun->mutex); 1397 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1398 error_report("iSCSI: NOP timeout. Reconnecting..."); 1399 iscsilun->request_timed_out = true; 1400 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1401 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1402 goto out; 1403 } 1404 1405 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1406 iscsi_set_events(iscsilun); 1407 1408 out: 1409 qemu_mutex_unlock(&iscsilun->mutex); 1410 } 1411 1412 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1413 { 1414 struct scsi_task *task = NULL; 1415 struct scsi_readcapacity10 *rc10 = NULL; 1416 struct scsi_readcapacity16 *rc16 = NULL; 1417 int retries = ISCSI_CMD_RETRIES; 1418 1419 do { 1420 if (task != NULL) { 1421 scsi_free_scsi_task(task); 1422 task = NULL; 1423 } 1424 1425 switch (iscsilun->type) { 1426 case TYPE_DISK: 1427 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1428 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1429 rc16 = scsi_datain_unmarshall(task); 1430 if (rc16 == NULL) { 1431 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1432 } else { 1433 iscsilun->block_size = rc16->block_length; 1434 iscsilun->num_blocks = rc16->returned_lba + 1; 1435 iscsilun->lbpme = !!rc16->lbpme; 1436 iscsilun->lbprz = !!rc16->lbprz; 1437 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1438 } 1439 break; 1440 } 1441 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1442 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1443 break; 1444 } 1445 /* Fall through and try READ CAPACITY(10) instead. */ 1446 case TYPE_ROM: 1447 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1448 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1449 rc10 = scsi_datain_unmarshall(task); 1450 if (rc10 == NULL) { 1451 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1452 } else { 1453 iscsilun->block_size = rc10->block_size; 1454 if (rc10->lba == 0) { 1455 /* blank disk loaded */ 1456 iscsilun->num_blocks = 0; 1457 } else { 1458 iscsilun->num_blocks = rc10->lba + 1; 1459 } 1460 } 1461 } 1462 break; 1463 default: 1464 return; 1465 } 1466 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1467 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1468 && retries-- > 0); 1469 1470 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1471 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1472 } else if (!iscsilun->block_size || 1473 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1474 error_setg(errp, "iSCSI: the target returned an invalid " 1475 "block size of %d.", iscsilun->block_size); 1476 } 1477 if (task) { 1478 scsi_free_scsi_task(task); 1479 } 1480 } 1481 1482 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1483 int evpd, int pc, void **inq, Error **errp) 1484 { 1485 int full_size; 1486 struct scsi_task *task = NULL; 1487 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1488 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1489 goto fail; 1490 } 1491 full_size = scsi_datain_getfullsize(task); 1492 if (full_size > task->datain.size) { 1493 scsi_free_scsi_task(task); 1494 1495 /* we need more data for the full list */ 1496 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1497 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1498 goto fail; 1499 } 1500 } 1501 1502 *inq = scsi_datain_unmarshall(task); 1503 if (*inq == NULL) { 1504 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1505 goto fail_with_err; 1506 } 1507 1508 return task; 1509 1510 fail: 1511 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1512 iscsi_get_error(iscsi)); 1513 fail_with_err: 1514 if (task != NULL) { 1515 scsi_free_scsi_task(task); 1516 } 1517 return NULL; 1518 } 1519 1520 static void iscsi_detach_aio_context(BlockDriverState *bs) 1521 { 1522 IscsiLun *iscsilun = bs->opaque; 1523 1524 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1525 false, NULL, NULL, NULL, NULL); 1526 iscsilun->events = 0; 1527 1528 if (iscsilun->nop_timer) { 1529 timer_del(iscsilun->nop_timer); 1530 timer_free(iscsilun->nop_timer); 1531 iscsilun->nop_timer = NULL; 1532 } 1533 if (iscsilun->event_timer) { 1534 timer_del(iscsilun->event_timer); 1535 timer_free(iscsilun->event_timer); 1536 iscsilun->event_timer = NULL; 1537 } 1538 } 1539 1540 static void iscsi_attach_aio_context(BlockDriverState *bs, 1541 AioContext *new_context) 1542 { 1543 IscsiLun *iscsilun = bs->opaque; 1544 1545 iscsilun->aio_context = new_context; 1546 iscsi_set_events(iscsilun); 1547 1548 /* Set up a timer for sending out iSCSI NOPs */ 1549 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1550 QEMU_CLOCK_REALTIME, SCALE_MS, 1551 iscsi_nop_timed_event, iscsilun); 1552 timer_mod(iscsilun->nop_timer, 1553 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1554 1555 /* Set up a timer for periodic calls to iscsi_set_events and to 1556 * scan for command timeout */ 1557 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1558 QEMU_CLOCK_REALTIME, SCALE_MS, 1559 iscsi_timed_check_events, iscsilun); 1560 timer_mod(iscsilun->event_timer, 1561 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1562 } 1563 1564 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1565 { 1566 struct scsi_task *task; 1567 struct scsi_mode_sense *ms = NULL; 1568 iscsilun->write_protected = false; 1569 iscsilun->dpofua = false; 1570 1571 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1572 1, SCSI_MODESENSE_PC_CURRENT, 1573 0x3F, 0, 255); 1574 if (task == NULL) { 1575 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1576 iscsi_get_error(iscsilun->iscsi)); 1577 goto out; 1578 } 1579 1580 if (task->status != SCSI_STATUS_GOOD) { 1581 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1582 goto out; 1583 } 1584 ms = scsi_datain_unmarshall(task); 1585 if (!ms) { 1586 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1587 iscsi_get_error(iscsilun->iscsi)); 1588 goto out; 1589 } 1590 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1591 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1592 1593 out: 1594 if (task) { 1595 scsi_free_scsi_task(task); 1596 } 1597 } 1598 1599 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1600 { 1601 QemuOptsList *list; 1602 QemuOpts *opts; 1603 const char *user, *password, *password_secret, *initiator_name, 1604 *header_digest, *timeout; 1605 1606 list = qemu_find_opts("iscsi"); 1607 if (!list) { 1608 return; 1609 } 1610 1611 opts = qemu_opts_find(list, target); 1612 if (opts == NULL) { 1613 opts = QTAILQ_FIRST(&list->head); 1614 if (!opts) { 1615 return; 1616 } 1617 } 1618 1619 user = qemu_opt_get(opts, "user"); 1620 if (user) { 1621 qdict_set_default_str(options, "user", user); 1622 } 1623 1624 password = qemu_opt_get(opts, "password"); 1625 if (password) { 1626 qdict_set_default_str(options, "password", password); 1627 } 1628 1629 password_secret = qemu_opt_get(opts, "password-secret"); 1630 if (password_secret) { 1631 qdict_set_default_str(options, "password-secret", password_secret); 1632 } 1633 1634 initiator_name = qemu_opt_get(opts, "initiator-name"); 1635 if (initiator_name) { 1636 qdict_set_default_str(options, "initiator-name", initiator_name); 1637 } 1638 1639 header_digest = qemu_opt_get(opts, "header-digest"); 1640 if (header_digest) { 1641 /* -iscsi takes upper case values, but QAPI only supports lower case 1642 * enum constant names, so we have to convert here. */ 1643 char *qapi_value = g_ascii_strdown(header_digest, -1); 1644 qdict_set_default_str(options, "header-digest", qapi_value); 1645 g_free(qapi_value); 1646 } 1647 1648 timeout = qemu_opt_get(opts, "timeout"); 1649 if (timeout) { 1650 qdict_set_default_str(options, "timeout", timeout); 1651 } 1652 } 1653 1654 /* 1655 * We support iscsi url's on the form 1656 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1657 */ 1658 static void iscsi_parse_filename(const char *filename, QDict *options, 1659 Error **errp) 1660 { 1661 struct iscsi_url *iscsi_url; 1662 const char *transport_name; 1663 char *lun_str; 1664 1665 iscsi_url = iscsi_parse_full_url(NULL, filename); 1666 if (iscsi_url == NULL) { 1667 error_setg(errp, "Failed to parse URL : %s", filename); 1668 return; 1669 } 1670 1671 #if LIBISCSI_API_VERSION >= (20160603) 1672 switch (iscsi_url->transport) { 1673 case TCP_TRANSPORT: 1674 transport_name = "tcp"; 1675 break; 1676 case ISER_TRANSPORT: 1677 transport_name = "iser"; 1678 break; 1679 default: 1680 error_setg(errp, "Unknown transport type (%d)", 1681 iscsi_url->transport); 1682 return; 1683 } 1684 #else 1685 transport_name = "tcp"; 1686 #endif 1687 1688 qdict_set_default_str(options, "transport", transport_name); 1689 qdict_set_default_str(options, "portal", iscsi_url->portal); 1690 qdict_set_default_str(options, "target", iscsi_url->target); 1691 1692 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1693 qdict_set_default_str(options, "lun", lun_str); 1694 g_free(lun_str); 1695 1696 /* User/password from -iscsi take precedence over those from the URL */ 1697 iscsi_parse_iscsi_option(iscsi_url->target, options); 1698 1699 if (iscsi_url->user[0] != '\0') { 1700 qdict_set_default_str(options, "user", iscsi_url->user); 1701 qdict_set_default_str(options, "password", iscsi_url->passwd); 1702 } 1703 1704 iscsi_destroy_url(iscsi_url); 1705 } 1706 1707 static QemuOptsList runtime_opts = { 1708 .name = "iscsi", 1709 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1710 .desc = { 1711 { 1712 .name = "transport", 1713 .type = QEMU_OPT_STRING, 1714 }, 1715 { 1716 .name = "portal", 1717 .type = QEMU_OPT_STRING, 1718 }, 1719 { 1720 .name = "target", 1721 .type = QEMU_OPT_STRING, 1722 }, 1723 { 1724 .name = "user", 1725 .type = QEMU_OPT_STRING, 1726 }, 1727 { 1728 .name = "password", 1729 .type = QEMU_OPT_STRING, 1730 }, 1731 { 1732 .name = "password-secret", 1733 .type = QEMU_OPT_STRING, 1734 }, 1735 { 1736 .name = "lun", 1737 .type = QEMU_OPT_NUMBER, 1738 }, 1739 { 1740 .name = "initiator-name", 1741 .type = QEMU_OPT_STRING, 1742 }, 1743 { 1744 .name = "header-digest", 1745 .type = QEMU_OPT_STRING, 1746 }, 1747 { 1748 .name = "timeout", 1749 .type = QEMU_OPT_NUMBER, 1750 }, 1751 { /* end of list */ } 1752 }, 1753 }; 1754 1755 static void iscsi_save_designator(IscsiLun *lun, 1756 struct scsi_inquiry_device_identification *inq_di) 1757 { 1758 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1759 1760 for (desig = inq_di->designators; desig; desig = desig->next) { 1761 if (desig->association || 1762 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1763 continue; 1764 } 1765 /* NAA works better than T10 vendor ID based designator. */ 1766 if (!copy || copy->designator_type < desig->designator_type) { 1767 copy = desig; 1768 } 1769 } 1770 if (copy) { 1771 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1772 *lun->dd = *copy; 1773 lun->dd->next = NULL; 1774 lun->dd->designator = g_malloc(copy->designator_length); 1775 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1776 } 1777 } 1778 1779 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1780 Error **errp) 1781 { 1782 IscsiLun *iscsilun = bs->opaque; 1783 struct iscsi_context *iscsi = NULL; 1784 struct scsi_task *task = NULL; 1785 struct scsi_inquiry_standard *inq = NULL; 1786 struct scsi_inquiry_supported_pages *inq_vpd; 1787 char *initiator_name = NULL; 1788 QemuOpts *opts; 1789 Error *local_err = NULL; 1790 const char *transport_name, *portal, *target; 1791 #if LIBISCSI_API_VERSION >= (20160603) 1792 enum iscsi_transport_type transport; 1793 #endif 1794 int i, ret = 0, timeout = 0, lun; 1795 1796 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1797 qemu_opts_absorb_qdict(opts, options, &local_err); 1798 if (local_err) { 1799 error_propagate(errp, local_err); 1800 ret = -EINVAL; 1801 goto out; 1802 } 1803 1804 transport_name = qemu_opt_get(opts, "transport"); 1805 portal = qemu_opt_get(opts, "portal"); 1806 target = qemu_opt_get(opts, "target"); 1807 lun = qemu_opt_get_number(opts, "lun", 0); 1808 1809 if (!transport_name || !portal || !target) { 1810 error_setg(errp, "Need all of transport, portal and target options"); 1811 ret = -EINVAL; 1812 goto out; 1813 } 1814 1815 if (!strcmp(transport_name, "tcp")) { 1816 #if LIBISCSI_API_VERSION >= (20160603) 1817 transport = TCP_TRANSPORT; 1818 } else if (!strcmp(transport_name, "iser")) { 1819 transport = ISER_TRANSPORT; 1820 #else 1821 /* TCP is what older libiscsi versions always use */ 1822 #endif 1823 } else { 1824 error_setg(errp, "Unknown transport: %s", transport_name); 1825 ret = -EINVAL; 1826 goto out; 1827 } 1828 1829 memset(iscsilun, 0, sizeof(IscsiLun)); 1830 1831 initiator_name = get_initiator_name(opts); 1832 1833 iscsi = iscsi_create_context(initiator_name); 1834 if (iscsi == NULL) { 1835 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1836 ret = -ENOMEM; 1837 goto out; 1838 } 1839 #if LIBISCSI_API_VERSION >= (20160603) 1840 if (iscsi_init_transport(iscsi, transport)) { 1841 error_setg(errp, ("Error initializing transport.")); 1842 ret = -EINVAL; 1843 goto out; 1844 } 1845 #endif 1846 if (iscsi_set_targetname(iscsi, target)) { 1847 error_setg(errp, "iSCSI: Failed to set target name."); 1848 ret = -EINVAL; 1849 goto out; 1850 } 1851 1852 /* check if we got CHAP username/password via the options */ 1853 apply_chap(iscsi, opts, &local_err); 1854 if (local_err != NULL) { 1855 error_propagate(errp, local_err); 1856 ret = -EINVAL; 1857 goto out; 1858 } 1859 1860 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1861 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1862 ret = -EINVAL; 1863 goto out; 1864 } 1865 1866 /* check if we got HEADER_DIGEST via the options */ 1867 apply_header_digest(iscsi, opts, &local_err); 1868 if (local_err != NULL) { 1869 error_propagate(errp, local_err); 1870 ret = -EINVAL; 1871 goto out; 1872 } 1873 1874 /* timeout handling is broken in libiscsi before 1.15.0 */ 1875 timeout = qemu_opt_get_number(opts, "timeout", 0); 1876 #if LIBISCSI_API_VERSION >= 20150621 1877 iscsi_set_timeout(iscsi, timeout); 1878 #else 1879 if (timeout) { 1880 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1881 } 1882 #endif 1883 1884 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1885 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1886 iscsi_get_error(iscsi)); 1887 ret = -EINVAL; 1888 goto out; 1889 } 1890 1891 iscsilun->iscsi = iscsi; 1892 iscsilun->aio_context = bdrv_get_aio_context(bs); 1893 iscsilun->lun = lun; 1894 iscsilun->has_write_same = true; 1895 1896 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1897 (void **) &inq, errp); 1898 if (task == NULL) { 1899 ret = -EINVAL; 1900 goto out; 1901 } 1902 iscsilun->type = inq->periperal_device_type; 1903 scsi_free_scsi_task(task); 1904 task = NULL; 1905 1906 iscsi_modesense_sync(iscsilun); 1907 if (iscsilun->dpofua) { 1908 bs->supported_write_flags = BDRV_REQ_FUA; 1909 } 1910 1911 /* Check the write protect flag of the LUN if we want to write */ 1912 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1913 iscsilun->write_protected) { 1914 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1915 if (ret < 0) { 1916 goto out; 1917 } 1918 flags &= ~BDRV_O_RDWR; 1919 } 1920 1921 iscsi_readcapacity_sync(iscsilun, &local_err); 1922 if (local_err != NULL) { 1923 error_propagate(errp, local_err); 1924 ret = -EINVAL; 1925 goto out; 1926 } 1927 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1928 1929 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1930 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1931 * will try to read from the device to guess the image format. 1932 */ 1933 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1934 bs->sg = true; 1935 } 1936 1937 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1938 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1939 (void **) &inq_vpd, errp); 1940 if (task == NULL) { 1941 ret = -EINVAL; 1942 goto out; 1943 } 1944 for (i = 0; i < inq_vpd->num_pages; i++) { 1945 struct scsi_task *inq_task; 1946 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1947 struct scsi_inquiry_block_limits *inq_bl; 1948 struct scsi_inquiry_device_identification *inq_di; 1949 switch (inq_vpd->pages[i]) { 1950 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1951 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1952 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1953 (void **) &inq_lbp, errp); 1954 if (inq_task == NULL) { 1955 ret = -EINVAL; 1956 goto out; 1957 } 1958 memcpy(&iscsilun->lbp, inq_lbp, 1959 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1960 scsi_free_scsi_task(inq_task); 1961 break; 1962 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1963 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1964 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1965 (void **) &inq_bl, errp); 1966 if (inq_task == NULL) { 1967 ret = -EINVAL; 1968 goto out; 1969 } 1970 memcpy(&iscsilun->bl, inq_bl, 1971 sizeof(struct scsi_inquiry_block_limits)); 1972 scsi_free_scsi_task(inq_task); 1973 break; 1974 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1975 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1976 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1977 (void **) &inq_di, errp); 1978 if (inq_task == NULL) { 1979 ret = -EINVAL; 1980 goto out; 1981 } 1982 iscsi_save_designator(iscsilun, inq_di); 1983 scsi_free_scsi_task(inq_task); 1984 break; 1985 default: 1986 break; 1987 } 1988 } 1989 scsi_free_scsi_task(task); 1990 task = NULL; 1991 1992 qemu_mutex_init(&iscsilun->mutex); 1993 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1994 1995 /* Guess the internal cluster (page) size of the iscsi target by the means 1996 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1997 * reasonable size */ 1998 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1999 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 2000 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 2001 iscsilun->block_size; 2002 if (iscsilun->lbprz) { 2003 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 2004 } 2005 } 2006 2007 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2008 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2009 } 2010 2011 out: 2012 qemu_opts_del(opts); 2013 g_free(initiator_name); 2014 if (task != NULL) { 2015 scsi_free_scsi_task(task); 2016 } 2017 2018 if (ret) { 2019 if (iscsi != NULL) { 2020 if (iscsi_is_logged_in(iscsi)) { 2021 iscsi_logout_sync(iscsi); 2022 } 2023 iscsi_destroy_context(iscsi); 2024 } 2025 memset(iscsilun, 0, sizeof(IscsiLun)); 2026 } 2027 2028 return ret; 2029 } 2030 2031 static void iscsi_close(BlockDriverState *bs) 2032 { 2033 IscsiLun *iscsilun = bs->opaque; 2034 struct iscsi_context *iscsi = iscsilun->iscsi; 2035 2036 iscsi_detach_aio_context(bs); 2037 if (iscsi_is_logged_in(iscsi)) { 2038 iscsi_logout_sync(iscsi); 2039 } 2040 iscsi_destroy_context(iscsi); 2041 if (iscsilun->dd) { 2042 g_free(iscsilun->dd->designator); 2043 g_free(iscsilun->dd); 2044 } 2045 g_free(iscsilun->zeroblock); 2046 iscsi_allocmap_free(iscsilun); 2047 qemu_mutex_destroy(&iscsilun->mutex); 2048 memset(iscsilun, 0, sizeof(IscsiLun)); 2049 } 2050 2051 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2052 { 2053 /* We don't actually refresh here, but just return data queried in 2054 * iscsi_open(): iscsi targets don't change their limits. */ 2055 2056 IscsiLun *iscsilun = bs->opaque; 2057 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2058 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2059 2060 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2061 2062 bs->bl.request_alignment = block_size; 2063 2064 if (iscsilun->bl.max_xfer_len) { 2065 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2066 } 2067 2068 if (max_xfer_len * block_size < INT_MAX) { 2069 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2070 } 2071 2072 if (iscsilun->lbp.lbpu) { 2073 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2074 bs->bl.max_pdiscard = 2075 iscsilun->bl.max_unmap * iscsilun->block_size; 2076 } 2077 bs->bl.pdiscard_alignment = 2078 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2079 } else { 2080 bs->bl.pdiscard_alignment = iscsilun->block_size; 2081 } 2082 2083 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2084 bs->bl.max_pwrite_zeroes = 2085 iscsilun->bl.max_ws_len * iscsilun->block_size; 2086 } 2087 if (iscsilun->lbp.lbpws) { 2088 bs->bl.pwrite_zeroes_alignment = 2089 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2090 } else { 2091 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2092 } 2093 if (iscsilun->bl.opt_xfer_len && 2094 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2095 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2096 iscsilun->block_size); 2097 } 2098 } 2099 2100 /* Note that this will not re-establish a connection with an iSCSI target - it 2101 * is effectively a NOP. */ 2102 static int iscsi_reopen_prepare(BDRVReopenState *state, 2103 BlockReopenQueue *queue, Error **errp) 2104 { 2105 IscsiLun *iscsilun = state->bs->opaque; 2106 2107 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2108 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2109 return -EACCES; 2110 } 2111 return 0; 2112 } 2113 2114 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2115 { 2116 IscsiLun *iscsilun = reopen_state->bs->opaque; 2117 2118 /* the cache.direct status might have changed */ 2119 if (iscsilun->allocmap != NULL) { 2120 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2121 } 2122 } 2123 2124 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2125 PreallocMode prealloc, Error **errp) 2126 { 2127 IscsiLun *iscsilun = bs->opaque; 2128 Error *local_err = NULL; 2129 2130 if (prealloc != PREALLOC_MODE_OFF) { 2131 error_setg(errp, "Unsupported preallocation mode '%s'", 2132 PreallocMode_str(prealloc)); 2133 return -ENOTSUP; 2134 } 2135 2136 if (iscsilun->type != TYPE_DISK) { 2137 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2138 return -ENOTSUP; 2139 } 2140 2141 iscsi_readcapacity_sync(iscsilun, &local_err); 2142 if (local_err != NULL) { 2143 error_propagate(errp, local_err); 2144 return -EIO; 2145 } 2146 2147 if (offset > iscsi_getlength(bs)) { 2148 error_setg(errp, "Cannot grow iSCSI devices"); 2149 return -EINVAL; 2150 } 2151 2152 if (iscsilun->allocmap != NULL) { 2153 iscsi_allocmap_init(iscsilun, bs->open_flags); 2154 } 2155 2156 return 0; 2157 } 2158 2159 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2160 Error **errp) 2161 { 2162 int ret = 0; 2163 int64_t total_size = 0; 2164 BlockDriverState *bs; 2165 IscsiLun *iscsilun = NULL; 2166 QDict *bs_options; 2167 Error *local_err = NULL; 2168 2169 bs = bdrv_new(); 2170 2171 /* Read out options */ 2172 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2173 BDRV_SECTOR_SIZE); 2174 bs->opaque = g_new0(struct IscsiLun, 1); 2175 iscsilun = bs->opaque; 2176 2177 bs_options = qdict_new(); 2178 iscsi_parse_filename(filename, bs_options, &local_err); 2179 if (local_err) { 2180 error_propagate(errp, local_err); 2181 ret = -EINVAL; 2182 } else { 2183 ret = iscsi_open(bs, bs_options, 0, NULL); 2184 } 2185 qobject_unref(bs_options); 2186 2187 if (ret != 0) { 2188 goto out; 2189 } 2190 iscsi_detach_aio_context(bs); 2191 if (iscsilun->type != TYPE_DISK) { 2192 ret = -ENODEV; 2193 goto out; 2194 } 2195 if (bs->total_sectors < total_size) { 2196 ret = -ENOSPC; 2197 goto out; 2198 } 2199 2200 ret = 0; 2201 out: 2202 if (iscsilun->iscsi != NULL) { 2203 iscsi_destroy_context(iscsilun->iscsi); 2204 } 2205 g_free(bs->opaque); 2206 bs->opaque = NULL; 2207 bdrv_unref(bs); 2208 return ret; 2209 } 2210 2211 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2212 { 2213 IscsiLun *iscsilun = bs->opaque; 2214 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2215 bdi->cluster_size = iscsilun->cluster_size; 2216 return 0; 2217 } 2218 2219 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2220 Error **errp) 2221 { 2222 IscsiLun *iscsilun = bs->opaque; 2223 iscsi_allocmap_invalidate(iscsilun); 2224 } 2225 2226 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2227 BdrvChild *src, 2228 uint64_t src_offset, 2229 BdrvChild *dst, 2230 uint64_t dst_offset, 2231 uint64_t bytes, 2232 BdrvRequestFlags read_flags, 2233 BdrvRequestFlags write_flags) 2234 { 2235 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2236 read_flags, write_flags); 2237 } 2238 2239 static struct scsi_task *iscsi_xcopy_task(int param_len) 2240 { 2241 struct scsi_task *task; 2242 2243 task = g_new0(struct scsi_task, 1); 2244 2245 task->cdb[0] = EXTENDED_COPY; 2246 task->cdb[10] = (param_len >> 24) & 0xFF; 2247 task->cdb[11] = (param_len >> 16) & 0xFF; 2248 task->cdb[12] = (param_len >> 8) & 0xFF; 2249 task->cdb[13] = param_len & 0xFF; 2250 task->cdb_size = 16; 2251 task->xfer_dir = SCSI_XFER_WRITE; 2252 task->expxferlen = param_len; 2253 2254 return task; 2255 } 2256 2257 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2258 { 2259 struct scsi_inquiry_device_designator *dd = lun->dd; 2260 2261 memset(desc, 0, 32); 2262 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2263 desc[4] = dd->code_set; 2264 desc[5] = (dd->designator_type & 0xF) 2265 | ((dd->association & 3) << 4); 2266 desc[7] = dd->designator_length; 2267 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2268 2269 desc[28] = 0; 2270 desc[29] = (lun->block_size >> 16) & 0xFF; 2271 desc[30] = (lun->block_size >> 8) & 0xFF; 2272 desc[31] = lun->block_size & 0xFF; 2273 } 2274 2275 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2276 int dst_index) 2277 { 2278 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2279 hdr[1] = ((dc << 1) | cat) & 0xFF; 2280 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2281 /* don't account for the first 4 bytes in descriptor header*/ 2282 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2283 hdr[4] = (src_index >> 8) & 0xFF; 2284 hdr[5] = src_index & 0xFF; 2285 hdr[6] = (dst_index >> 8) & 0xFF; 2286 hdr[7] = dst_index & 0xFF; 2287 } 2288 2289 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2290 int src_index, int dst_index, int num_blks, 2291 uint64_t src_lba, uint64_t dst_lba) 2292 { 2293 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2294 2295 /* The caller should verify the request size */ 2296 assert(num_blks < 65536); 2297 desc[10] = (num_blks >> 8) & 0xFF; 2298 desc[11] = num_blks & 0xFF; 2299 desc[12] = (src_lba >> 56) & 0xFF; 2300 desc[13] = (src_lba >> 48) & 0xFF; 2301 desc[14] = (src_lba >> 40) & 0xFF; 2302 desc[15] = (src_lba >> 32) & 0xFF; 2303 desc[16] = (src_lba >> 24) & 0xFF; 2304 desc[17] = (src_lba >> 16) & 0xFF; 2305 desc[18] = (src_lba >> 8) & 0xFF; 2306 desc[19] = src_lba & 0xFF; 2307 desc[20] = (dst_lba >> 56) & 0xFF; 2308 desc[21] = (dst_lba >> 48) & 0xFF; 2309 desc[22] = (dst_lba >> 40) & 0xFF; 2310 desc[23] = (dst_lba >> 32) & 0xFF; 2311 desc[24] = (dst_lba >> 24) & 0xFF; 2312 desc[25] = (dst_lba >> 16) & 0xFF; 2313 desc[26] = (dst_lba >> 8) & 0xFF; 2314 desc[27] = dst_lba & 0xFF; 2315 } 2316 2317 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2318 int list_id_usage, int prio, 2319 int tgt_desc_len, 2320 int seg_desc_len, int inline_data_len) 2321 { 2322 buf[0] = list_id; 2323 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2324 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2325 buf[3] = tgt_desc_len & 0xFF; 2326 buf[8] = (seg_desc_len >> 24) & 0xFF; 2327 buf[9] = (seg_desc_len >> 16) & 0xFF; 2328 buf[10] = (seg_desc_len >> 8) & 0xFF; 2329 buf[11] = seg_desc_len & 0xFF; 2330 buf[12] = (inline_data_len >> 24) & 0xFF; 2331 buf[13] = (inline_data_len >> 16) & 0xFF; 2332 buf[14] = (inline_data_len >> 8) & 0xFF; 2333 buf[15] = inline_data_len & 0xFF; 2334 } 2335 2336 static void iscsi_xcopy_data(struct iscsi_data *data, 2337 IscsiLun *src, int64_t src_lba, 2338 IscsiLun *dst, int64_t dst_lba, 2339 uint16_t num_blocks) 2340 { 2341 uint8_t *buf; 2342 const int src_offset = XCOPY_DESC_OFFSET; 2343 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2344 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2345 2346 data->size = XCOPY_DESC_OFFSET + 2347 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2348 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2349 data->data = g_malloc0(data->size); 2350 buf = data->data; 2351 2352 /* Initialise the parameter list header */ 2353 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2354 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2355 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2356 0); 2357 2358 /* Initialise CSCD list with one src + one dst descriptor */ 2359 iscsi_populate_target_desc(&buf[src_offset], src); 2360 iscsi_populate_target_desc(&buf[dst_offset], dst); 2361 2362 /* Initialise one segment descriptor */ 2363 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2364 src_lba, dst_lba); 2365 } 2366 2367 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2368 BdrvChild *src, 2369 uint64_t src_offset, 2370 BdrvChild *dst, 2371 uint64_t dst_offset, 2372 uint64_t bytes, 2373 BdrvRequestFlags read_flags, 2374 BdrvRequestFlags write_flags) 2375 { 2376 IscsiLun *dst_lun = dst->bs->opaque; 2377 IscsiLun *src_lun; 2378 struct IscsiTask iscsi_task; 2379 struct iscsi_data data; 2380 int r = 0; 2381 int block_size; 2382 2383 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2384 return -ENOTSUP; 2385 } 2386 src_lun = src->bs->opaque; 2387 2388 if (!src_lun->dd || !dst_lun->dd) { 2389 return -ENOTSUP; 2390 } 2391 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2392 return -ENOTSUP; 2393 } 2394 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2395 return -ENOTSUP; 2396 } 2397 if (dst_lun->block_size != src_lun->block_size || 2398 !dst_lun->block_size) { 2399 return -ENOTSUP; 2400 } 2401 2402 block_size = dst_lun->block_size; 2403 if (bytes / block_size > 65535) { 2404 return -ENOTSUP; 2405 } 2406 2407 iscsi_xcopy_data(&data, 2408 src_lun, src_offset / block_size, 2409 dst_lun, dst_offset / block_size, 2410 bytes / block_size); 2411 2412 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2413 2414 qemu_mutex_lock(&dst_lun->mutex); 2415 iscsi_task.task = iscsi_xcopy_task(data.size); 2416 retry: 2417 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2418 iscsi_task.task, iscsi_co_generic_cb, 2419 &data, 2420 &iscsi_task) != 0) { 2421 r = -EIO; 2422 goto out_unlock; 2423 } 2424 2425 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2426 2427 if (iscsi_task.do_retry) { 2428 iscsi_task.complete = 0; 2429 goto retry; 2430 } 2431 2432 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2433 r = iscsi_task.err_code; 2434 goto out_unlock; 2435 } 2436 2437 out_unlock: 2438 2439 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2440 g_free(iscsi_task.task); 2441 qemu_mutex_unlock(&dst_lun->mutex); 2442 g_free(iscsi_task.err_str); 2443 return r; 2444 } 2445 2446 static QemuOptsList iscsi_create_opts = { 2447 .name = "iscsi-create-opts", 2448 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2449 .desc = { 2450 { 2451 .name = BLOCK_OPT_SIZE, 2452 .type = QEMU_OPT_SIZE, 2453 .help = "Virtual disk size" 2454 }, 2455 { /* end of list */ } 2456 } 2457 }; 2458 2459 static const char *const iscsi_strong_runtime_opts[] = { 2460 "transport", 2461 "portal", 2462 "target", 2463 "user", 2464 "password", 2465 "password-secret", 2466 "lun", 2467 "initiator-name", 2468 "header-digest", 2469 2470 NULL 2471 }; 2472 2473 static BlockDriver bdrv_iscsi = { 2474 .format_name = "iscsi", 2475 .protocol_name = "iscsi", 2476 2477 .instance_size = sizeof(IscsiLun), 2478 .bdrv_parse_filename = iscsi_parse_filename, 2479 .bdrv_file_open = iscsi_open, 2480 .bdrv_close = iscsi_close, 2481 .bdrv_co_create_opts = iscsi_co_create_opts, 2482 .create_opts = &iscsi_create_opts, 2483 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2484 .bdrv_reopen_commit = iscsi_reopen_commit, 2485 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2486 2487 .bdrv_getlength = iscsi_getlength, 2488 .bdrv_get_info = iscsi_get_info, 2489 .bdrv_co_truncate = iscsi_co_truncate, 2490 .bdrv_refresh_limits = iscsi_refresh_limits, 2491 2492 .bdrv_co_block_status = iscsi_co_block_status, 2493 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2494 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2495 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2496 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2497 .bdrv_co_readv = iscsi_co_readv, 2498 .bdrv_co_writev = iscsi_co_writev, 2499 .bdrv_co_flush_to_disk = iscsi_co_flush, 2500 2501 #ifdef __linux__ 2502 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2503 #endif 2504 2505 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2506 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2507 2508 .strong_runtime_opts = iscsi_strong_runtime_opts, 2509 }; 2510 2511 #if LIBISCSI_API_VERSION >= (20160603) 2512 static BlockDriver bdrv_iser = { 2513 .format_name = "iser", 2514 .protocol_name = "iser", 2515 2516 .instance_size = sizeof(IscsiLun), 2517 .bdrv_parse_filename = iscsi_parse_filename, 2518 .bdrv_file_open = iscsi_open, 2519 .bdrv_close = iscsi_close, 2520 .bdrv_co_create_opts = iscsi_co_create_opts, 2521 .create_opts = &iscsi_create_opts, 2522 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2523 .bdrv_reopen_commit = iscsi_reopen_commit, 2524 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2525 2526 .bdrv_getlength = iscsi_getlength, 2527 .bdrv_get_info = iscsi_get_info, 2528 .bdrv_co_truncate = iscsi_co_truncate, 2529 .bdrv_refresh_limits = iscsi_refresh_limits, 2530 2531 .bdrv_co_block_status = iscsi_co_block_status, 2532 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2533 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2534 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2535 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2536 .bdrv_co_readv = iscsi_co_readv, 2537 .bdrv_co_writev = iscsi_co_writev, 2538 .bdrv_co_flush_to_disk = iscsi_co_flush, 2539 2540 #ifdef __linux__ 2541 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2542 #endif 2543 2544 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2545 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2546 2547 .strong_runtime_opts = iscsi_strong_runtime_opts, 2548 }; 2549 #endif 2550 2551 static void iscsi_block_init(void) 2552 { 2553 bdrv_register(&bdrv_iscsi); 2554 #if LIBISCSI_API_VERSION >= (20160603) 2555 bdrv_register(&bdrv_iser); 2556 #endif 2557 } 2558 2559 block_init(iscsi_block_init); 2560