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 static void 149 iscsi_bh_cb(void *p) 150 { 151 IscsiAIOCB *acb = p; 152 153 qemu_bh_delete(acb->bh); 154 155 acb->common.cb(acb->common.opaque, acb->status); 156 157 if (acb->task != NULL) { 158 scsi_free_scsi_task(acb->task); 159 acb->task = NULL; 160 } 161 162 qemu_aio_unref(acb); 163 } 164 165 static void 166 iscsi_schedule_bh(IscsiAIOCB *acb) 167 { 168 if (acb->bh) { 169 return; 170 } 171 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 172 qemu_bh_schedule(acb->bh); 173 } 174 175 static void iscsi_co_generic_bh_cb(void *opaque) 176 { 177 struct IscsiTask *iTask = opaque; 178 179 iTask->complete = 1; 180 aio_co_wake(iTask->co); 181 } 182 183 static void iscsi_retry_timer_expired(void *opaque) 184 { 185 struct IscsiTask *iTask = opaque; 186 iTask->complete = 1; 187 if (iTask->co) { 188 aio_co_wake(iTask->co); 189 } 190 } 191 192 static inline unsigned exp_random(double mean) 193 { 194 return -mean * log((double)rand() / RAND_MAX); 195 } 196 197 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 198 * libiscsi 1.10.0, together with other constants we need. Use it as 199 * a hint that we have to define them ourselves if needed, to keep the 200 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 201 * the test because SCSI_STATUS_* is an enum. 202 * 203 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 204 * an enum, check against the LIBISCSI_API_VERSION macro, which was 205 * introduced in 1.11.0. If it is present, there is no need to define 206 * anything. 207 */ 208 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 209 !defined(LIBISCSI_API_VERSION) 210 #define SCSI_STATUS_TASK_SET_FULL 0x28 211 #define SCSI_STATUS_TIMEOUT 0x0f000002 212 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 213 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 214 #endif 215 216 #ifndef LIBISCSI_API_VERSION 217 #define LIBISCSI_API_VERSION 20130701 218 #endif 219 220 static int iscsi_translate_sense(struct scsi_sense *sense) 221 { 222 return - scsi_sense_to_errno(sense->key, 223 (sense->ascq & 0xFF00) >> 8, 224 sense->ascq & 0xFF); 225 } 226 227 /* Called (via iscsi_service) with QemuMutex held. */ 228 static void 229 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 230 void *command_data, void *opaque) 231 { 232 struct IscsiTask *iTask = opaque; 233 struct scsi_task *task = command_data; 234 235 iTask->status = status; 236 iTask->do_retry = 0; 237 iTask->task = task; 238 239 if (status != SCSI_STATUS_GOOD) { 240 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 241 if (status == SCSI_STATUS_CHECK_CONDITION 242 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 243 error_report("iSCSI CheckCondition: %s", 244 iscsi_get_error(iscsi)); 245 iTask->do_retry = 1; 246 goto out; 247 } 248 if (status == SCSI_STATUS_BUSY || 249 status == SCSI_STATUS_TIMEOUT || 250 status == SCSI_STATUS_TASK_SET_FULL) { 251 unsigned retry_time = 252 exp_random(iscsi_retry_times[iTask->retries - 1]); 253 if (status == SCSI_STATUS_TIMEOUT) { 254 /* make sure the request is rescheduled AFTER the 255 * reconnect is initiated */ 256 retry_time = EVENT_INTERVAL * 2; 257 iTask->iscsilun->request_timed_out = true; 258 } 259 error_report("iSCSI Busy/TaskSetFull/TimeOut" 260 " (retry #%u in %u ms): %s", 261 iTask->retries, retry_time, 262 iscsi_get_error(iscsi)); 263 aio_timer_init(iTask->iscsilun->aio_context, 264 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 265 SCALE_MS, iscsi_retry_timer_expired, iTask); 266 timer_mod(&iTask->retry_timer, 267 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 268 iTask->do_retry = 1; 269 return; 270 } 271 } 272 iTask->err_code = iscsi_translate_sense(&task->sense); 273 iTask->err_str = g_strdup(iscsi_get_error(iscsi)); 274 } 275 276 out: 277 if (iTask->co) { 278 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 279 iscsi_co_generic_bh_cb, iTask); 280 } else { 281 iTask->complete = 1; 282 } 283 } 284 285 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 286 { 287 *iTask = (struct IscsiTask) { 288 .co = qemu_coroutine_self(), 289 .iscsilun = iscsilun, 290 }; 291 } 292 293 /* Called (via iscsi_service) with QemuMutex held. */ 294 static void 295 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 296 void *private_data) 297 { 298 IscsiAIOCB *acb = private_data; 299 300 /* If the command callback hasn't been called yet, drop the task */ 301 if (!acb->bh) { 302 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */ 303 iscsi_scsi_cancel_task(iscsi, acb->task); 304 } 305 306 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */ 307 } 308 309 static void 310 iscsi_aio_cancel(BlockAIOCB *blockacb) 311 { 312 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 313 IscsiLun *iscsilun = acb->iscsilun; 314 315 qemu_mutex_lock(&iscsilun->mutex); 316 317 /* If it was cancelled or completed already, our work is done here */ 318 if (acb->cancelled || acb->status != -EINPROGRESS) { 319 qemu_mutex_unlock(&iscsilun->mutex); 320 return; 321 } 322 323 acb->cancelled = true; 324 325 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */ 326 327 /* send a task mgmt call to the target to cancel the task on the target */ 328 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 329 iscsi_abort_task_cb, acb) < 0) { 330 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */ 331 } 332 333 qemu_mutex_unlock(&iscsilun->mutex); 334 } 335 336 static const AIOCBInfo iscsi_aiocb_info = { 337 .aiocb_size = sizeof(IscsiAIOCB), 338 .cancel_async = iscsi_aio_cancel, 339 }; 340 341 342 static void iscsi_process_read(void *arg); 343 static void iscsi_process_write(void *arg); 344 345 /* Called with QemuMutex held. */ 346 static void 347 iscsi_set_events(IscsiLun *iscsilun) 348 { 349 struct iscsi_context *iscsi = iscsilun->iscsi; 350 int ev = iscsi_which_events(iscsi); 351 352 if (ev != iscsilun->events) { 353 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 354 false, 355 (ev & POLLIN) ? iscsi_process_read : NULL, 356 (ev & POLLOUT) ? iscsi_process_write : NULL, 357 NULL, 358 iscsilun); 359 iscsilun->events = ev; 360 } 361 } 362 363 static void iscsi_timed_check_events(void *opaque) 364 { 365 IscsiLun *iscsilun = opaque; 366 367 qemu_mutex_lock(&iscsilun->mutex); 368 369 /* check for timed out requests */ 370 iscsi_service(iscsilun->iscsi, 0); 371 372 if (iscsilun->request_timed_out) { 373 iscsilun->request_timed_out = false; 374 iscsi_reconnect(iscsilun->iscsi); 375 } 376 377 /* newer versions of libiscsi may return zero events. Ensure we are able 378 * to return to service once this situation changes. */ 379 iscsi_set_events(iscsilun); 380 381 qemu_mutex_unlock(&iscsilun->mutex); 382 383 timer_mod(iscsilun->event_timer, 384 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 385 } 386 387 static void 388 iscsi_process_read(void *arg) 389 { 390 IscsiLun *iscsilun = arg; 391 struct iscsi_context *iscsi = iscsilun->iscsi; 392 393 qemu_mutex_lock(&iscsilun->mutex); 394 iscsi_service(iscsi, POLLIN); 395 iscsi_set_events(iscsilun); 396 qemu_mutex_unlock(&iscsilun->mutex); 397 } 398 399 static void 400 iscsi_process_write(void *arg) 401 { 402 IscsiLun *iscsilun = arg; 403 struct iscsi_context *iscsi = iscsilun->iscsi; 404 405 qemu_mutex_lock(&iscsilun->mutex); 406 iscsi_service(iscsi, POLLOUT); 407 iscsi_set_events(iscsilun); 408 qemu_mutex_unlock(&iscsilun->mutex); 409 } 410 411 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 412 { 413 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 414 } 415 416 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 417 { 418 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 419 } 420 421 static bool is_byte_request_lun_aligned(int64_t offset, int count, 422 IscsiLun *iscsilun) 423 { 424 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 425 error_report("iSCSI misaligned request: " 426 "iscsilun->block_size %u, offset %" PRIi64 427 ", count %d", 428 iscsilun->block_size, offset, count); 429 return false; 430 } 431 return true; 432 } 433 434 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 435 IscsiLun *iscsilun) 436 { 437 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 438 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 439 nb_sectors << BDRV_SECTOR_BITS, 440 iscsilun); 441 } 442 443 static void iscsi_allocmap_free(IscsiLun *iscsilun) 444 { 445 g_free(iscsilun->allocmap); 446 g_free(iscsilun->allocmap_valid); 447 iscsilun->allocmap = NULL; 448 iscsilun->allocmap_valid = NULL; 449 } 450 451 452 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 453 { 454 iscsi_allocmap_free(iscsilun); 455 456 assert(iscsilun->cluster_size); 457 iscsilun->allocmap_size = 458 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size, 459 iscsilun->cluster_size); 460 461 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 462 if (!iscsilun->allocmap) { 463 return -ENOMEM; 464 } 465 466 if (open_flags & BDRV_O_NOCACHE) { 467 /* when cache.direct = on all allocmap entries are 468 * treated as invalid to force a relookup of the block 469 * status on every read request */ 470 return 0; 471 } 472 473 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 474 if (!iscsilun->allocmap_valid) { 475 /* if we are under memory pressure free the allocmap as well */ 476 iscsi_allocmap_free(iscsilun); 477 return -ENOMEM; 478 } 479 480 return 0; 481 } 482 483 static void 484 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset, 485 int64_t bytes, bool allocated, bool valid) 486 { 487 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 488 489 if (iscsilun->allocmap == NULL) { 490 return; 491 } 492 /* expand to entirely contain all affected clusters */ 493 assert(iscsilun->cluster_size); 494 cl_num_expanded = offset / iscsilun->cluster_size; 495 nb_cls_expanded = DIV_ROUND_UP(offset + bytes, 496 iscsilun->cluster_size) - cl_num_expanded; 497 /* shrink to touch only completely contained clusters */ 498 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size); 499 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk; 500 if (allocated) { 501 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 502 } else { 503 if (nb_cls_shrunk > 0) { 504 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 505 } 506 } 507 508 if (iscsilun->allocmap_valid == NULL) { 509 return; 510 } 511 if (valid) { 512 if (nb_cls_shrunk > 0) { 513 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 514 } 515 } else { 516 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 517 nb_cls_expanded); 518 } 519 } 520 521 static void 522 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset, 523 int64_t bytes) 524 { 525 iscsi_allocmap_update(iscsilun, offset, bytes, true, true); 526 } 527 528 static void 529 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset, 530 int64_t bytes) 531 { 532 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 533 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 534 */ 535 iscsi_allocmap_update(iscsilun, offset, bytes, false, true); 536 } 537 538 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset, 539 int64_t bytes) 540 { 541 iscsi_allocmap_update(iscsilun, offset, bytes, false, false); 542 } 543 544 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 545 { 546 if (iscsilun->allocmap) { 547 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 548 } 549 if (iscsilun->allocmap_valid) { 550 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 551 } 552 } 553 554 static inline bool 555 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset, 556 int64_t bytes) 557 { 558 unsigned long size; 559 if (iscsilun->allocmap == NULL) { 560 return true; 561 } 562 assert(iscsilun->cluster_size); 563 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 564 return !(find_next_bit(iscsilun->allocmap, size, 565 offset / iscsilun->cluster_size) == size); 566 } 567 568 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 569 int64_t offset, int64_t bytes) 570 { 571 unsigned long size; 572 if (iscsilun->allocmap_valid == NULL) { 573 return false; 574 } 575 assert(iscsilun->cluster_size); 576 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size); 577 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 578 offset / iscsilun->cluster_size) == size); 579 } 580 581 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask, 582 IscsiLun *iscsilun) 583 { 584 while (!iTask->complete) { 585 iscsi_set_events(iscsilun); 586 qemu_mutex_unlock(&iscsilun->mutex); 587 qemu_coroutine_yield(); 588 qemu_mutex_lock(&iscsilun->mutex); 589 } 590 } 591 592 static int coroutine_fn 593 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 594 QEMUIOVector *iov, int flags) 595 { 596 IscsiLun *iscsilun = bs->opaque; 597 struct IscsiTask iTask; 598 uint64_t lba; 599 uint32_t num_sectors; 600 bool fua = flags & BDRV_REQ_FUA; 601 int r = 0; 602 603 if (fua) { 604 assert(iscsilun->dpofua); 605 } 606 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 607 return -EINVAL; 608 } 609 610 if (bs->bl.max_transfer) { 611 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 612 } 613 614 lba = sector_qemu2lun(sector_num, iscsilun); 615 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 616 iscsi_co_init_iscsitask(iscsilun, &iTask); 617 qemu_mutex_lock(&iscsilun->mutex); 618 retry: 619 if (iscsilun->use_16_for_rw) { 620 #if LIBISCSI_API_VERSION >= (20160603) 621 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 622 NULL, num_sectors * iscsilun->block_size, 623 iscsilun->block_size, 0, 0, fua, 0, 0, 624 iscsi_co_generic_cb, &iTask, 625 (struct scsi_iovec *)iov->iov, iov->niov); 626 } else { 627 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 628 NULL, num_sectors * iscsilun->block_size, 629 iscsilun->block_size, 0, 0, fua, 0, 0, 630 iscsi_co_generic_cb, &iTask, 631 (struct scsi_iovec *)iov->iov, iov->niov); 632 } 633 #else 634 iTask.task = iscsi_write16_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 } else { 639 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 640 NULL, num_sectors * iscsilun->block_size, 641 iscsilun->block_size, 0, 0, fua, 0, 0, 642 iscsi_co_generic_cb, &iTask); 643 } 644 #endif 645 if (iTask.task == NULL) { 646 qemu_mutex_unlock(&iscsilun->mutex); 647 return -ENOMEM; 648 } 649 #if LIBISCSI_API_VERSION < (20160603) 650 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 651 iov->niov); 652 #endif 653 iscsi_co_wait_for_task(&iTask, iscsilun); 654 655 if (iTask.task != NULL) { 656 scsi_free_scsi_task(iTask.task); 657 iTask.task = NULL; 658 } 659 660 if (iTask.do_retry) { 661 iTask.complete = 0; 662 goto retry; 663 } 664 665 if (iTask.status != SCSI_STATUS_GOOD) { 666 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 667 nb_sectors * BDRV_SECTOR_SIZE); 668 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba, 669 iTask.err_str); 670 r = iTask.err_code; 671 goto out_unlock; 672 } 673 674 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 675 nb_sectors * BDRV_SECTOR_SIZE); 676 677 out_unlock: 678 qemu_mutex_unlock(&iscsilun->mutex); 679 g_free(iTask.err_str); 680 return r; 681 } 682 683 684 685 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs, 686 bool want_zero, int64_t offset, 687 int64_t bytes, int64_t *pnum, 688 int64_t *map, 689 BlockDriverState **file) 690 { 691 IscsiLun *iscsilun = bs->opaque; 692 struct scsi_get_lba_status *lbas = NULL; 693 struct scsi_lba_status_descriptor *lbasd = NULL; 694 struct IscsiTask iTask; 695 uint64_t lba; 696 int ret; 697 698 iscsi_co_init_iscsitask(iscsilun, &iTask); 699 700 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size)); 701 702 /* default to all sectors allocated */ 703 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 704 if (map) { 705 *map = offset; 706 } 707 *pnum = bytes; 708 709 /* LUN does not support logical block provisioning */ 710 if (!iscsilun->lbpme) { 711 goto out; 712 } 713 714 lba = offset / iscsilun->block_size; 715 716 qemu_mutex_lock(&iscsilun->mutex); 717 retry: 718 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 719 lba, 8 + 16, iscsi_co_generic_cb, 720 &iTask) == NULL) { 721 ret = -ENOMEM; 722 goto out_unlock; 723 } 724 iscsi_co_wait_for_task(&iTask, iscsilun); 725 726 if (iTask.do_retry) { 727 if (iTask.task != NULL) { 728 scsi_free_scsi_task(iTask.task); 729 iTask.task = NULL; 730 } 731 iTask.complete = 0; 732 goto retry; 733 } 734 735 if (iTask.status != SCSI_STATUS_GOOD) { 736 /* in case the get_lba_status_callout fails (i.e. 737 * because the device is busy or the cmd is not 738 * supported) we pretend all blocks are allocated 739 * for backwards compatibility */ 740 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s", 741 lba, iTask.err_str); 742 goto out_unlock; 743 } 744 745 lbas = scsi_datain_unmarshall(iTask.task); 746 if (lbas == NULL) { 747 ret = -EIO; 748 goto out_unlock; 749 } 750 751 lbasd = &lbas->descriptors[0]; 752 753 if (lba != lbasd->lba) { 754 ret = -EIO; 755 goto out_unlock; 756 } 757 758 *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size; 759 760 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 761 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 762 ret &= ~BDRV_BLOCK_DATA; 763 if (iscsilun->lbprz) { 764 ret |= BDRV_BLOCK_ZERO; 765 } 766 } 767 768 if (ret & BDRV_BLOCK_ZERO) { 769 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum); 770 } else { 771 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum); 772 } 773 774 if (*pnum > bytes) { 775 *pnum = bytes; 776 } 777 out_unlock: 778 qemu_mutex_unlock(&iscsilun->mutex); 779 g_free(iTask.err_str); 780 out: 781 if (iTask.task != NULL) { 782 scsi_free_scsi_task(iTask.task); 783 } 784 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) { 785 *file = bs; 786 } 787 return ret; 788 } 789 790 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 791 int64_t sector_num, int nb_sectors, 792 QEMUIOVector *iov) 793 { 794 IscsiLun *iscsilun = bs->opaque; 795 struct IscsiTask iTask; 796 uint64_t lba; 797 uint32_t num_sectors; 798 int r = 0; 799 800 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 801 return -EINVAL; 802 } 803 804 if (bs->bl.max_transfer) { 805 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 806 } 807 808 /* if cache.direct is off and we have a valid entry in our allocation map 809 * we can skip checking the block status and directly return zeroes if 810 * the request falls within an unallocated area */ 811 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 812 nb_sectors * BDRV_SECTOR_SIZE) && 813 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 814 nb_sectors * BDRV_SECTOR_SIZE)) { 815 qemu_iovec_memset(iov, 0, 0x00, iov->size); 816 return 0; 817 } 818 819 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 820 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE, 821 nb_sectors * BDRV_SECTOR_SIZE) && 822 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE, 823 nb_sectors * BDRV_SECTOR_SIZE)) { 824 int64_t pnum; 825 /* check the block status from the beginning of the cluster 826 * containing the start sector */ 827 int64_t head; 828 int ret; 829 830 assert(iscsilun->cluster_size); 831 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size; 832 ret = iscsi_co_block_status(bs, true, 833 sector_num * BDRV_SECTOR_SIZE - head, 834 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL); 835 if (ret < 0) { 836 return ret; 837 } 838 /* if the whole request falls into an unallocated area we can avoid 839 * reading and directly return zeroes instead */ 840 if (ret & BDRV_BLOCK_ZERO && 841 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) { 842 qemu_iovec_memset(iov, 0, 0x00, iov->size); 843 return 0; 844 } 845 } 846 847 lba = sector_qemu2lun(sector_num, iscsilun); 848 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 849 850 iscsi_co_init_iscsitask(iscsilun, &iTask); 851 qemu_mutex_lock(&iscsilun->mutex); 852 retry: 853 if (iscsilun->use_16_for_rw) { 854 #if LIBISCSI_API_VERSION >= (20160603) 855 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 856 num_sectors * iscsilun->block_size, 857 iscsilun->block_size, 0, 0, 0, 0, 0, 858 iscsi_co_generic_cb, &iTask, 859 (struct scsi_iovec *)iov->iov, iov->niov); 860 } else { 861 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 862 num_sectors * iscsilun->block_size, 863 iscsilun->block_size, 864 0, 0, 0, 0, 0, 865 iscsi_co_generic_cb, &iTask, 866 (struct scsi_iovec *)iov->iov, iov->niov); 867 } 868 #else 869 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 870 num_sectors * iscsilun->block_size, 871 iscsilun->block_size, 0, 0, 0, 0, 0, 872 iscsi_co_generic_cb, &iTask); 873 } else { 874 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 875 num_sectors * iscsilun->block_size, 876 iscsilun->block_size, 877 0, 0, 0, 0, 0, 878 iscsi_co_generic_cb, &iTask); 879 } 880 #endif 881 if (iTask.task == NULL) { 882 qemu_mutex_unlock(&iscsilun->mutex); 883 return -ENOMEM; 884 } 885 #if LIBISCSI_API_VERSION < (20160603) 886 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 887 #endif 888 889 iscsi_co_wait_for_task(&iTask, iscsilun); 890 if (iTask.task != NULL) { 891 scsi_free_scsi_task(iTask.task); 892 iTask.task = NULL; 893 } 894 895 if (iTask.do_retry) { 896 iTask.complete = 0; 897 goto retry; 898 } 899 900 if (iTask.status != SCSI_STATUS_GOOD) { 901 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s", 902 lba, iTask.err_str); 903 r = iTask.err_code; 904 } 905 906 qemu_mutex_unlock(&iscsilun->mutex); 907 g_free(iTask.err_str); 908 return r; 909 } 910 911 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 912 { 913 IscsiLun *iscsilun = bs->opaque; 914 struct IscsiTask iTask; 915 int r = 0; 916 917 iscsi_co_init_iscsitask(iscsilun, &iTask); 918 qemu_mutex_lock(&iscsilun->mutex); 919 retry: 920 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 921 0, iscsi_co_generic_cb, &iTask) == NULL) { 922 qemu_mutex_unlock(&iscsilun->mutex); 923 return -ENOMEM; 924 } 925 926 iscsi_co_wait_for_task(&iTask, iscsilun); 927 928 if (iTask.task != NULL) { 929 scsi_free_scsi_task(iTask.task); 930 iTask.task = NULL; 931 } 932 933 if (iTask.do_retry) { 934 iTask.complete = 0; 935 goto retry; 936 } 937 938 if (iTask.status != SCSI_STATUS_GOOD) { 939 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str); 940 r = iTask.err_code; 941 } 942 943 qemu_mutex_unlock(&iscsilun->mutex); 944 g_free(iTask.err_str); 945 return r; 946 } 947 948 #ifdef __linux__ 949 /* Called (via iscsi_service) with QemuMutex held. */ 950 static void 951 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 952 void *command_data, void *opaque) 953 { 954 IscsiAIOCB *acb = opaque; 955 956 if (status == SCSI_STATUS_CANCELLED) { 957 if (!acb->bh) { 958 acb->status = -ECANCELED; 959 iscsi_schedule_bh(acb); 960 } 961 return; 962 } 963 964 acb->status = 0; 965 if (status < 0) { 966 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 967 iscsi_get_error(iscsi)); 968 acb->status = iscsi_translate_sense(&acb->task->sense); 969 } 970 971 acb->ioh->driver_status = 0; 972 acb->ioh->host_status = 0; 973 acb->ioh->resid = 0; 974 acb->ioh->status = status; 975 976 #define SG_ERR_DRIVER_SENSE 0x08 977 978 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 979 int ss; 980 981 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 982 983 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 984 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 985 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 986 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 987 } 988 989 iscsi_schedule_bh(acb); 990 } 991 992 static void iscsi_ioctl_bh_completion(void *opaque) 993 { 994 IscsiAIOCB *acb = opaque; 995 996 qemu_bh_delete(acb->bh); 997 acb->common.cb(acb->common.opaque, acb->ret); 998 qemu_aio_unref(acb); 999 } 1000 1001 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 1002 { 1003 BlockDriverState *bs = acb->common.bs; 1004 IscsiLun *iscsilun = bs->opaque; 1005 int ret = 0; 1006 1007 switch (req) { 1008 case SG_GET_VERSION_NUM: 1009 *(int *)buf = 30000; 1010 break; 1011 case SG_GET_SCSI_ID: 1012 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 1013 break; 1014 default: 1015 ret = -EINVAL; 1016 } 1017 assert(!acb->bh); 1018 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 1019 iscsi_ioctl_bh_completion, acb); 1020 acb->ret = ret; 1021 qemu_bh_schedule(acb->bh); 1022 } 1023 1024 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 1025 unsigned long int req, void *buf, 1026 BlockCompletionFunc *cb, void *opaque) 1027 { 1028 IscsiLun *iscsilun = bs->opaque; 1029 struct iscsi_context *iscsi = iscsilun->iscsi; 1030 struct iscsi_data data; 1031 IscsiAIOCB *acb; 1032 1033 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 1034 1035 acb->iscsilun = iscsilun; 1036 acb->bh = NULL; 1037 acb->status = -EINPROGRESS; 1038 acb->ioh = buf; 1039 acb->cancelled = false; 1040 1041 if (req != SG_IO) { 1042 iscsi_ioctl_handle_emulated(acb, req, buf); 1043 return &acb->common; 1044 } 1045 1046 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1047 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1048 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1049 qemu_aio_unref(acb); 1050 return NULL; 1051 } 1052 1053 acb->task = malloc(sizeof(struct scsi_task)); 1054 if (acb->task == NULL) { 1055 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1056 iscsi_get_error(iscsi)); 1057 qemu_aio_unref(acb); 1058 return NULL; 1059 } 1060 memset(acb->task, 0, sizeof(struct scsi_task)); 1061 1062 switch (acb->ioh->dxfer_direction) { 1063 case SG_DXFER_TO_DEV: 1064 acb->task->xfer_dir = SCSI_XFER_WRITE; 1065 break; 1066 case SG_DXFER_FROM_DEV: 1067 acb->task->xfer_dir = SCSI_XFER_READ; 1068 break; 1069 default: 1070 acb->task->xfer_dir = SCSI_XFER_NONE; 1071 break; 1072 } 1073 1074 acb->task->cdb_size = acb->ioh->cmd_len; 1075 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1076 acb->task->expxferlen = acb->ioh->dxfer_len; 1077 1078 data.size = 0; 1079 qemu_mutex_lock(&iscsilun->mutex); 1080 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1081 if (acb->ioh->iovec_count == 0) { 1082 data.data = acb->ioh->dxferp; 1083 data.size = acb->ioh->dxfer_len; 1084 } else { 1085 scsi_task_set_iov_out(acb->task, 1086 (struct scsi_iovec *) acb->ioh->dxferp, 1087 acb->ioh->iovec_count); 1088 } 1089 } 1090 1091 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1092 iscsi_aio_ioctl_cb, 1093 (data.size > 0) ? &data : NULL, 1094 acb) != 0) { 1095 qemu_mutex_unlock(&iscsilun->mutex); 1096 scsi_free_scsi_task(acb->task); 1097 qemu_aio_unref(acb); 1098 return NULL; 1099 } 1100 1101 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1102 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1103 if (acb->ioh->iovec_count == 0) { 1104 scsi_task_add_data_in_buffer(acb->task, 1105 acb->ioh->dxfer_len, 1106 acb->ioh->dxferp); 1107 } else { 1108 scsi_task_set_iov_in(acb->task, 1109 (struct scsi_iovec *) acb->ioh->dxferp, 1110 acb->ioh->iovec_count); 1111 } 1112 } 1113 1114 iscsi_set_events(iscsilun); 1115 qemu_mutex_unlock(&iscsilun->mutex); 1116 1117 return &acb->common; 1118 } 1119 1120 #endif 1121 1122 static int64_t 1123 iscsi_getlength(BlockDriverState *bs) 1124 { 1125 IscsiLun *iscsilun = bs->opaque; 1126 int64_t len; 1127 1128 len = iscsilun->num_blocks; 1129 len *= iscsilun->block_size; 1130 1131 return len; 1132 } 1133 1134 static int 1135 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) 1136 { 1137 IscsiLun *iscsilun = bs->opaque; 1138 struct IscsiTask iTask; 1139 struct unmap_list list; 1140 int r = 0; 1141 1142 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1143 return -ENOTSUP; 1144 } 1145 1146 if (!iscsilun->lbp.lbpu) { 1147 /* UNMAP is not supported by the target */ 1148 return 0; 1149 } 1150 1151 list.lba = offset / iscsilun->block_size; 1152 list.num = bytes / iscsilun->block_size; 1153 1154 iscsi_co_init_iscsitask(iscsilun, &iTask); 1155 qemu_mutex_lock(&iscsilun->mutex); 1156 retry: 1157 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1158 iscsi_co_generic_cb, &iTask) == NULL) { 1159 r = -ENOMEM; 1160 goto out_unlock; 1161 } 1162 1163 iscsi_co_wait_for_task(&iTask, iscsilun); 1164 1165 if (iTask.task != NULL) { 1166 scsi_free_scsi_task(iTask.task); 1167 iTask.task = NULL; 1168 } 1169 1170 if (iTask.do_retry) { 1171 iTask.complete = 0; 1172 goto retry; 1173 } 1174 1175 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1176 1177 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1178 /* the target might fail with a check condition if it 1179 is not happy with the alignment of the UNMAP request 1180 we silently fail in this case */ 1181 goto out_unlock; 1182 } 1183 1184 if (iTask.status != SCSI_STATUS_GOOD) { 1185 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s", 1186 list.lba, iTask.err_str); 1187 r = iTask.err_code; 1188 goto out_unlock; 1189 } 1190 1191 out_unlock: 1192 qemu_mutex_unlock(&iscsilun->mutex); 1193 g_free(iTask.err_str); 1194 return r; 1195 } 1196 1197 static int 1198 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1199 int bytes, BdrvRequestFlags flags) 1200 { 1201 IscsiLun *iscsilun = bs->opaque; 1202 struct IscsiTask iTask; 1203 uint64_t lba; 1204 uint32_t nb_blocks; 1205 bool use_16_for_ws = iscsilun->use_16_for_rw; 1206 int r = 0; 1207 1208 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) { 1209 return -ENOTSUP; 1210 } 1211 1212 if (flags & BDRV_REQ_MAY_UNMAP) { 1213 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1214 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1215 use_16_for_ws = true; 1216 } 1217 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1218 /* WRITESAME16 with UNMAP is not supported by the target, 1219 * fall back and try WRITESAME10/16 without UNMAP */ 1220 flags &= ~BDRV_REQ_MAY_UNMAP; 1221 use_16_for_ws = iscsilun->use_16_for_rw; 1222 } 1223 } 1224 1225 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1226 /* WRITESAME without UNMAP is not supported by the target */ 1227 return -ENOTSUP; 1228 } 1229 1230 lba = offset / iscsilun->block_size; 1231 nb_blocks = bytes / iscsilun->block_size; 1232 1233 if (iscsilun->zeroblock == NULL) { 1234 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1235 if (iscsilun->zeroblock == NULL) { 1236 return -ENOMEM; 1237 } 1238 } 1239 1240 qemu_mutex_lock(&iscsilun->mutex); 1241 iscsi_co_init_iscsitask(iscsilun, &iTask); 1242 retry: 1243 if (use_16_for_ws) { 1244 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1245 iscsilun->zeroblock, iscsilun->block_size, 1246 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1247 0, 0, iscsi_co_generic_cb, &iTask); 1248 } else { 1249 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1250 iscsilun->zeroblock, iscsilun->block_size, 1251 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1252 0, 0, iscsi_co_generic_cb, &iTask); 1253 } 1254 if (iTask.task == NULL) { 1255 qemu_mutex_unlock(&iscsilun->mutex); 1256 return -ENOMEM; 1257 } 1258 1259 iscsi_co_wait_for_task(&iTask, iscsilun); 1260 1261 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1262 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1263 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1264 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1265 /* WRITE SAME is not supported by the target */ 1266 iscsilun->has_write_same = false; 1267 scsi_free_scsi_task(iTask.task); 1268 r = -ENOTSUP; 1269 goto out_unlock; 1270 } 1271 1272 if (iTask.task != NULL) { 1273 scsi_free_scsi_task(iTask.task); 1274 iTask.task = NULL; 1275 } 1276 1277 if (iTask.do_retry) { 1278 iTask.complete = 0; 1279 goto retry; 1280 } 1281 1282 if (iTask.status != SCSI_STATUS_GOOD) { 1283 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1284 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s", 1285 lba, iTask.err_str); 1286 r = iTask.err_code; 1287 goto out_unlock; 1288 } 1289 1290 if (flags & BDRV_REQ_MAY_UNMAP) { 1291 iscsi_allocmap_set_invalid(iscsilun, offset, bytes); 1292 } else { 1293 iscsi_allocmap_set_allocated(iscsilun, offset, bytes); 1294 } 1295 1296 out_unlock: 1297 qemu_mutex_unlock(&iscsilun->mutex); 1298 g_free(iTask.err_str); 1299 return r; 1300 } 1301 1302 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts, 1303 Error **errp) 1304 { 1305 const char *user = NULL; 1306 const char *password = NULL; 1307 const char *secretid; 1308 char *secret = NULL; 1309 1310 user = qemu_opt_get(opts, "user"); 1311 if (!user) { 1312 return; 1313 } 1314 1315 secretid = qemu_opt_get(opts, "password-secret"); 1316 password = qemu_opt_get(opts, "password"); 1317 if (secretid && password) { 1318 error_setg(errp, "'password' and 'password-secret' properties are " 1319 "mutually exclusive"); 1320 return; 1321 } 1322 if (secretid) { 1323 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1324 if (!secret) { 1325 return; 1326 } 1327 password = secret; 1328 } else if (!password) { 1329 error_setg(errp, "CHAP username specified but no password was given"); 1330 return; 1331 } 1332 1333 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1334 error_setg(errp, "Failed to set initiator username and password"); 1335 } 1336 1337 g_free(secret); 1338 } 1339 1340 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts, 1341 Error **errp) 1342 { 1343 const char *digest = NULL; 1344 1345 digest = qemu_opt_get(opts, "header-digest"); 1346 if (!digest) { 1347 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1348 } else if (!strcmp(digest, "crc32c")) { 1349 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1350 } else if (!strcmp(digest, "none")) { 1351 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1352 } else if (!strcmp(digest, "crc32c-none")) { 1353 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1354 } else if (!strcmp(digest, "none-crc32c")) { 1355 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1356 } else { 1357 error_setg(errp, "Invalid header-digest setting : %s", digest); 1358 } 1359 } 1360 1361 static char *get_initiator_name(QemuOpts *opts) 1362 { 1363 const char *name; 1364 char *iscsi_name; 1365 UuidInfo *uuid_info; 1366 1367 name = qemu_opt_get(opts, "initiator-name"); 1368 if (name) { 1369 return g_strdup(name); 1370 } 1371 1372 uuid_info = qmp_query_uuid(NULL); 1373 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1374 name = qemu_get_vm_name(); 1375 } else { 1376 name = uuid_info->UUID; 1377 } 1378 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1379 name ? ":" : "", name ? name : ""); 1380 qapi_free_UuidInfo(uuid_info); 1381 return iscsi_name; 1382 } 1383 1384 static void iscsi_nop_timed_event(void *opaque) 1385 { 1386 IscsiLun *iscsilun = opaque; 1387 1388 qemu_mutex_lock(&iscsilun->mutex); 1389 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1390 error_report("iSCSI: NOP timeout. Reconnecting..."); 1391 iscsilun->request_timed_out = true; 1392 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1393 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1394 goto out; 1395 } 1396 1397 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1398 iscsi_set_events(iscsilun); 1399 1400 out: 1401 qemu_mutex_unlock(&iscsilun->mutex); 1402 } 1403 1404 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1405 { 1406 struct scsi_task *task = NULL; 1407 struct scsi_readcapacity10 *rc10 = NULL; 1408 struct scsi_readcapacity16 *rc16 = NULL; 1409 int retries = ISCSI_CMD_RETRIES; 1410 1411 do { 1412 if (task != NULL) { 1413 scsi_free_scsi_task(task); 1414 task = NULL; 1415 } 1416 1417 switch (iscsilun->type) { 1418 case TYPE_DISK: 1419 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1420 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1421 rc16 = scsi_datain_unmarshall(task); 1422 if (rc16 == NULL) { 1423 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1424 } else { 1425 iscsilun->block_size = rc16->block_length; 1426 iscsilun->num_blocks = rc16->returned_lba + 1; 1427 iscsilun->lbpme = !!rc16->lbpme; 1428 iscsilun->lbprz = !!rc16->lbprz; 1429 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1430 } 1431 break; 1432 } 1433 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1434 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1435 break; 1436 } 1437 /* Fall through and try READ CAPACITY(10) instead. */ 1438 case TYPE_ROM: 1439 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1440 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1441 rc10 = scsi_datain_unmarshall(task); 1442 if (rc10 == NULL) { 1443 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1444 } else { 1445 iscsilun->block_size = rc10->block_size; 1446 if (rc10->lba == 0) { 1447 /* blank disk loaded */ 1448 iscsilun->num_blocks = 0; 1449 } else { 1450 iscsilun->num_blocks = rc10->lba + 1; 1451 } 1452 } 1453 } 1454 break; 1455 default: 1456 return; 1457 } 1458 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1459 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1460 && retries-- > 0); 1461 1462 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1463 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1464 } else if (!iscsilun->block_size || 1465 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1466 error_setg(errp, "iSCSI: the target returned an invalid " 1467 "block size of %d.", iscsilun->block_size); 1468 } 1469 if (task) { 1470 scsi_free_scsi_task(task); 1471 } 1472 } 1473 1474 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1475 int evpd, int pc, void **inq, Error **errp) 1476 { 1477 int full_size; 1478 struct scsi_task *task = NULL; 1479 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1480 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1481 goto fail; 1482 } 1483 full_size = scsi_datain_getfullsize(task); 1484 if (full_size > task->datain.size) { 1485 scsi_free_scsi_task(task); 1486 1487 /* we need more data for the full list */ 1488 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1489 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1490 goto fail; 1491 } 1492 } 1493 1494 *inq = scsi_datain_unmarshall(task); 1495 if (*inq == NULL) { 1496 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1497 goto fail_with_err; 1498 } 1499 1500 return task; 1501 1502 fail: 1503 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1504 iscsi_get_error(iscsi)); 1505 fail_with_err: 1506 if (task != NULL) { 1507 scsi_free_scsi_task(task); 1508 } 1509 return NULL; 1510 } 1511 1512 static void iscsi_detach_aio_context(BlockDriverState *bs) 1513 { 1514 IscsiLun *iscsilun = bs->opaque; 1515 1516 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1517 false, NULL, NULL, NULL, NULL); 1518 iscsilun->events = 0; 1519 1520 if (iscsilun->nop_timer) { 1521 timer_del(iscsilun->nop_timer); 1522 timer_free(iscsilun->nop_timer); 1523 iscsilun->nop_timer = NULL; 1524 } 1525 if (iscsilun->event_timer) { 1526 timer_del(iscsilun->event_timer); 1527 timer_free(iscsilun->event_timer); 1528 iscsilun->event_timer = NULL; 1529 } 1530 } 1531 1532 static void iscsi_attach_aio_context(BlockDriverState *bs, 1533 AioContext *new_context) 1534 { 1535 IscsiLun *iscsilun = bs->opaque; 1536 1537 iscsilun->aio_context = new_context; 1538 iscsi_set_events(iscsilun); 1539 1540 /* Set up a timer for sending out iSCSI NOPs */ 1541 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1542 QEMU_CLOCK_REALTIME, SCALE_MS, 1543 iscsi_nop_timed_event, iscsilun); 1544 timer_mod(iscsilun->nop_timer, 1545 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1546 1547 /* Set up a timer for periodic calls to iscsi_set_events and to 1548 * scan for command timeout */ 1549 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1550 QEMU_CLOCK_REALTIME, SCALE_MS, 1551 iscsi_timed_check_events, iscsilun); 1552 timer_mod(iscsilun->event_timer, 1553 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1554 } 1555 1556 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1557 { 1558 struct scsi_task *task; 1559 struct scsi_mode_sense *ms = NULL; 1560 iscsilun->write_protected = false; 1561 iscsilun->dpofua = false; 1562 1563 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1564 1, SCSI_MODESENSE_PC_CURRENT, 1565 0x3F, 0, 255); 1566 if (task == NULL) { 1567 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1568 iscsi_get_error(iscsilun->iscsi)); 1569 goto out; 1570 } 1571 1572 if (task->status != SCSI_STATUS_GOOD) { 1573 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1574 goto out; 1575 } 1576 ms = scsi_datain_unmarshall(task); 1577 if (!ms) { 1578 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1579 iscsi_get_error(iscsilun->iscsi)); 1580 goto out; 1581 } 1582 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1583 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1584 1585 out: 1586 if (task) { 1587 scsi_free_scsi_task(task); 1588 } 1589 } 1590 1591 static void iscsi_parse_iscsi_option(const char *target, QDict *options) 1592 { 1593 QemuOptsList *list; 1594 QemuOpts *opts; 1595 const char *user, *password, *password_secret, *initiator_name, 1596 *header_digest, *timeout; 1597 1598 list = qemu_find_opts("iscsi"); 1599 if (!list) { 1600 return; 1601 } 1602 1603 opts = qemu_opts_find(list, target); 1604 if (opts == NULL) { 1605 opts = QTAILQ_FIRST(&list->head); 1606 if (!opts) { 1607 return; 1608 } 1609 } 1610 1611 user = qemu_opt_get(opts, "user"); 1612 if (user) { 1613 qdict_set_default_str(options, "user", user); 1614 } 1615 1616 password = qemu_opt_get(opts, "password"); 1617 if (password) { 1618 qdict_set_default_str(options, "password", password); 1619 } 1620 1621 password_secret = qemu_opt_get(opts, "password-secret"); 1622 if (password_secret) { 1623 qdict_set_default_str(options, "password-secret", password_secret); 1624 } 1625 1626 initiator_name = qemu_opt_get(opts, "initiator-name"); 1627 if (initiator_name) { 1628 qdict_set_default_str(options, "initiator-name", initiator_name); 1629 } 1630 1631 header_digest = qemu_opt_get(opts, "header-digest"); 1632 if (header_digest) { 1633 /* -iscsi takes upper case values, but QAPI only supports lower case 1634 * enum constant names, so we have to convert here. */ 1635 char *qapi_value = g_ascii_strdown(header_digest, -1); 1636 qdict_set_default_str(options, "header-digest", qapi_value); 1637 g_free(qapi_value); 1638 } 1639 1640 timeout = qemu_opt_get(opts, "timeout"); 1641 if (timeout) { 1642 qdict_set_default_str(options, "timeout", timeout); 1643 } 1644 } 1645 1646 /* 1647 * We support iscsi url's on the form 1648 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1649 */ 1650 static void iscsi_parse_filename(const char *filename, QDict *options, 1651 Error **errp) 1652 { 1653 struct iscsi_url *iscsi_url; 1654 const char *transport_name; 1655 char *lun_str; 1656 1657 iscsi_url = iscsi_parse_full_url(NULL, filename); 1658 if (iscsi_url == NULL) { 1659 error_setg(errp, "Failed to parse URL : %s", filename); 1660 return; 1661 } 1662 1663 #if LIBISCSI_API_VERSION >= (20160603) 1664 switch (iscsi_url->transport) { 1665 case TCP_TRANSPORT: 1666 transport_name = "tcp"; 1667 break; 1668 case ISER_TRANSPORT: 1669 transport_name = "iser"; 1670 break; 1671 default: 1672 error_setg(errp, "Unknown transport type (%d)", 1673 iscsi_url->transport); 1674 return; 1675 } 1676 #else 1677 transport_name = "tcp"; 1678 #endif 1679 1680 qdict_set_default_str(options, "transport", transport_name); 1681 qdict_set_default_str(options, "portal", iscsi_url->portal); 1682 qdict_set_default_str(options, "target", iscsi_url->target); 1683 1684 lun_str = g_strdup_printf("%d", iscsi_url->lun); 1685 qdict_set_default_str(options, "lun", lun_str); 1686 g_free(lun_str); 1687 1688 /* User/password from -iscsi take precedence over those from the URL */ 1689 iscsi_parse_iscsi_option(iscsi_url->target, options); 1690 1691 if (iscsi_url->user[0] != '\0') { 1692 qdict_set_default_str(options, "user", iscsi_url->user); 1693 qdict_set_default_str(options, "password", iscsi_url->passwd); 1694 } 1695 1696 iscsi_destroy_url(iscsi_url); 1697 } 1698 1699 static QemuOptsList runtime_opts = { 1700 .name = "iscsi", 1701 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1702 .desc = { 1703 { 1704 .name = "transport", 1705 .type = QEMU_OPT_STRING, 1706 }, 1707 { 1708 .name = "portal", 1709 .type = QEMU_OPT_STRING, 1710 }, 1711 { 1712 .name = "target", 1713 .type = QEMU_OPT_STRING, 1714 }, 1715 { 1716 .name = "user", 1717 .type = QEMU_OPT_STRING, 1718 }, 1719 { 1720 .name = "password", 1721 .type = QEMU_OPT_STRING, 1722 }, 1723 { 1724 .name = "password-secret", 1725 .type = QEMU_OPT_STRING, 1726 }, 1727 { 1728 .name = "lun", 1729 .type = QEMU_OPT_NUMBER, 1730 }, 1731 { 1732 .name = "initiator-name", 1733 .type = QEMU_OPT_STRING, 1734 }, 1735 { 1736 .name = "header-digest", 1737 .type = QEMU_OPT_STRING, 1738 }, 1739 { 1740 .name = "timeout", 1741 .type = QEMU_OPT_NUMBER, 1742 }, 1743 { /* end of list */ } 1744 }, 1745 }; 1746 1747 static void iscsi_save_designator(IscsiLun *lun, 1748 struct scsi_inquiry_device_identification *inq_di) 1749 { 1750 struct scsi_inquiry_device_designator *desig, *copy = NULL; 1751 1752 for (desig = inq_di->designators; desig; desig = desig->next) { 1753 if (desig->association || 1754 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) { 1755 continue; 1756 } 1757 /* NAA works better than T10 vendor ID based designator. */ 1758 if (!copy || copy->designator_type < desig->designator_type) { 1759 copy = desig; 1760 } 1761 } 1762 if (copy) { 1763 lun->dd = g_new(struct scsi_inquiry_device_designator, 1); 1764 *lun->dd = *copy; 1765 lun->dd->next = NULL; 1766 lun->dd->designator = g_malloc(copy->designator_length); 1767 memcpy(lun->dd->designator, copy->designator, copy->designator_length); 1768 } 1769 } 1770 1771 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1772 Error **errp) 1773 { 1774 IscsiLun *iscsilun = bs->opaque; 1775 struct iscsi_context *iscsi = NULL; 1776 struct scsi_task *task = NULL; 1777 struct scsi_inquiry_standard *inq = NULL; 1778 struct scsi_inquiry_supported_pages *inq_vpd; 1779 char *initiator_name = NULL; 1780 QemuOpts *opts; 1781 Error *local_err = NULL; 1782 const char *transport_name, *portal, *target; 1783 #if LIBISCSI_API_VERSION >= (20160603) 1784 enum iscsi_transport_type transport; 1785 #endif 1786 int i, ret = 0, timeout = 0, lun; 1787 1788 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1789 qemu_opts_absorb_qdict(opts, options, &local_err); 1790 if (local_err) { 1791 error_propagate(errp, local_err); 1792 ret = -EINVAL; 1793 goto out; 1794 } 1795 1796 transport_name = qemu_opt_get(opts, "transport"); 1797 portal = qemu_opt_get(opts, "portal"); 1798 target = qemu_opt_get(opts, "target"); 1799 lun = qemu_opt_get_number(opts, "lun", 0); 1800 1801 if (!transport_name || !portal || !target) { 1802 error_setg(errp, "Need all of transport, portal and target options"); 1803 ret = -EINVAL; 1804 goto out; 1805 } 1806 1807 if (!strcmp(transport_name, "tcp")) { 1808 #if LIBISCSI_API_VERSION >= (20160603) 1809 transport = TCP_TRANSPORT; 1810 } else if (!strcmp(transport_name, "iser")) { 1811 transport = ISER_TRANSPORT; 1812 #else 1813 /* TCP is what older libiscsi versions always use */ 1814 #endif 1815 } else { 1816 error_setg(errp, "Unknown transport: %s", transport_name); 1817 ret = -EINVAL; 1818 goto out; 1819 } 1820 1821 memset(iscsilun, 0, sizeof(IscsiLun)); 1822 1823 initiator_name = get_initiator_name(opts); 1824 1825 iscsi = iscsi_create_context(initiator_name); 1826 if (iscsi == NULL) { 1827 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1828 ret = -ENOMEM; 1829 goto out; 1830 } 1831 #if LIBISCSI_API_VERSION >= (20160603) 1832 if (iscsi_init_transport(iscsi, transport)) { 1833 error_setg(errp, ("Error initializing transport.")); 1834 ret = -EINVAL; 1835 goto out; 1836 } 1837 #endif 1838 if (iscsi_set_targetname(iscsi, target)) { 1839 error_setg(errp, "iSCSI: Failed to set target name."); 1840 ret = -EINVAL; 1841 goto out; 1842 } 1843 1844 /* check if we got CHAP username/password via the options */ 1845 apply_chap(iscsi, opts, &local_err); 1846 if (local_err != NULL) { 1847 error_propagate(errp, local_err); 1848 ret = -EINVAL; 1849 goto out; 1850 } 1851 1852 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1853 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1854 ret = -EINVAL; 1855 goto out; 1856 } 1857 1858 /* check if we got HEADER_DIGEST via the options */ 1859 apply_header_digest(iscsi, opts, &local_err); 1860 if (local_err != NULL) { 1861 error_propagate(errp, local_err); 1862 ret = -EINVAL; 1863 goto out; 1864 } 1865 1866 /* timeout handling is broken in libiscsi before 1.15.0 */ 1867 timeout = qemu_opt_get_number(opts, "timeout", 0); 1868 #if LIBISCSI_API_VERSION >= 20150621 1869 iscsi_set_timeout(iscsi, timeout); 1870 #else 1871 if (timeout) { 1872 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1873 } 1874 #endif 1875 1876 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) { 1877 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1878 iscsi_get_error(iscsi)); 1879 ret = -EINVAL; 1880 goto out; 1881 } 1882 1883 iscsilun->iscsi = iscsi; 1884 iscsilun->aio_context = bdrv_get_aio_context(bs); 1885 iscsilun->lun = lun; 1886 iscsilun->has_write_same = true; 1887 1888 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1889 (void **) &inq, errp); 1890 if (task == NULL) { 1891 ret = -EINVAL; 1892 goto out; 1893 } 1894 iscsilun->type = inq->periperal_device_type; 1895 scsi_free_scsi_task(task); 1896 task = NULL; 1897 1898 iscsi_modesense_sync(iscsilun); 1899 if (iscsilun->dpofua) { 1900 bs->supported_write_flags = BDRV_REQ_FUA; 1901 } 1902 1903 /* Check the write protect flag of the LUN if we want to write */ 1904 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1905 iscsilun->write_protected) { 1906 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp); 1907 if (ret < 0) { 1908 goto out; 1909 } 1910 flags &= ~BDRV_O_RDWR; 1911 } 1912 1913 iscsi_readcapacity_sync(iscsilun, &local_err); 1914 if (local_err != NULL) { 1915 error_propagate(errp, local_err); 1916 ret = -EINVAL; 1917 goto out; 1918 } 1919 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1920 1921 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1922 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1923 * will try to read from the device to guess the image format. 1924 */ 1925 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1926 bs->sg = true; 1927 } 1928 1929 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1930 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1931 (void **) &inq_vpd, errp); 1932 if (task == NULL) { 1933 ret = -EINVAL; 1934 goto out; 1935 } 1936 for (i = 0; i < inq_vpd->num_pages; i++) { 1937 struct scsi_task *inq_task; 1938 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1939 struct scsi_inquiry_block_limits *inq_bl; 1940 struct scsi_inquiry_device_identification *inq_di; 1941 switch (inq_vpd->pages[i]) { 1942 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1943 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1944 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1945 (void **) &inq_lbp, errp); 1946 if (inq_task == NULL) { 1947 ret = -EINVAL; 1948 goto out; 1949 } 1950 memcpy(&iscsilun->lbp, inq_lbp, 1951 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1952 scsi_free_scsi_task(inq_task); 1953 break; 1954 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1955 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1956 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1957 (void **) &inq_bl, errp); 1958 if (inq_task == NULL) { 1959 ret = -EINVAL; 1960 goto out; 1961 } 1962 memcpy(&iscsilun->bl, inq_bl, 1963 sizeof(struct scsi_inquiry_block_limits)); 1964 scsi_free_scsi_task(inq_task); 1965 break; 1966 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION: 1967 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1968 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION, 1969 (void **) &inq_di, errp); 1970 if (inq_task == NULL) { 1971 ret = -EINVAL; 1972 goto out; 1973 } 1974 iscsi_save_designator(iscsilun, inq_di); 1975 scsi_free_scsi_task(inq_task); 1976 break; 1977 default: 1978 break; 1979 } 1980 } 1981 scsi_free_scsi_task(task); 1982 task = NULL; 1983 1984 qemu_mutex_init(&iscsilun->mutex); 1985 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1986 1987 /* Guess the internal cluster (page) size of the iscsi target by the means 1988 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1989 * reasonable size */ 1990 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1991 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1992 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran * 1993 iscsilun->block_size; 1994 if (iscsilun->lbprz) { 1995 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1996 } 1997 } 1998 1999 if (iscsilun->lbprz && iscsilun->lbp.lbpws) { 2000 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 2001 } 2002 2003 out: 2004 qemu_opts_del(opts); 2005 g_free(initiator_name); 2006 if (task != NULL) { 2007 scsi_free_scsi_task(task); 2008 } 2009 2010 if (ret) { 2011 if (iscsi != NULL) { 2012 if (iscsi_is_logged_in(iscsi)) { 2013 iscsi_logout_sync(iscsi); 2014 } 2015 iscsi_destroy_context(iscsi); 2016 } 2017 memset(iscsilun, 0, sizeof(IscsiLun)); 2018 } 2019 2020 return ret; 2021 } 2022 2023 static void iscsi_close(BlockDriverState *bs) 2024 { 2025 IscsiLun *iscsilun = bs->opaque; 2026 struct iscsi_context *iscsi = iscsilun->iscsi; 2027 2028 iscsi_detach_aio_context(bs); 2029 if (iscsi_is_logged_in(iscsi)) { 2030 iscsi_logout_sync(iscsi); 2031 } 2032 iscsi_destroy_context(iscsi); 2033 if (iscsilun->dd) { 2034 g_free(iscsilun->dd->designator); 2035 g_free(iscsilun->dd); 2036 } 2037 g_free(iscsilun->zeroblock); 2038 iscsi_allocmap_free(iscsilun); 2039 qemu_mutex_destroy(&iscsilun->mutex); 2040 memset(iscsilun, 0, sizeof(IscsiLun)); 2041 } 2042 2043 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 2044 { 2045 /* We don't actually refresh here, but just return data queried in 2046 * iscsi_open(): iscsi targets don't change their limits. */ 2047 2048 IscsiLun *iscsilun = bs->opaque; 2049 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 2050 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 2051 2052 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 2053 2054 bs->bl.request_alignment = block_size; 2055 2056 if (iscsilun->bl.max_xfer_len) { 2057 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 2058 } 2059 2060 if (max_xfer_len * block_size < INT_MAX) { 2061 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 2062 } 2063 2064 if (iscsilun->lbp.lbpu) { 2065 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 2066 bs->bl.max_pdiscard = 2067 iscsilun->bl.max_unmap * iscsilun->block_size; 2068 } 2069 bs->bl.pdiscard_alignment = 2070 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2071 } else { 2072 bs->bl.pdiscard_alignment = iscsilun->block_size; 2073 } 2074 2075 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 2076 bs->bl.max_pwrite_zeroes = 2077 iscsilun->bl.max_ws_len * iscsilun->block_size; 2078 } 2079 if (iscsilun->lbp.lbpws) { 2080 bs->bl.pwrite_zeroes_alignment = 2081 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 2082 } else { 2083 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 2084 } 2085 if (iscsilun->bl.opt_xfer_len && 2086 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 2087 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 2088 iscsilun->block_size); 2089 } 2090 } 2091 2092 /* Note that this will not re-establish a connection with an iSCSI target - it 2093 * is effectively a NOP. */ 2094 static int iscsi_reopen_prepare(BDRVReopenState *state, 2095 BlockReopenQueue *queue, Error **errp) 2096 { 2097 IscsiLun *iscsilun = state->bs->opaque; 2098 2099 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 2100 error_setg(errp, "Cannot open a write protected LUN as read-write"); 2101 return -EACCES; 2102 } 2103 return 0; 2104 } 2105 2106 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 2107 { 2108 IscsiLun *iscsilun = reopen_state->bs->opaque; 2109 2110 /* the cache.direct status might have changed */ 2111 if (iscsilun->allocmap != NULL) { 2112 iscsi_allocmap_init(iscsilun, reopen_state->flags); 2113 } 2114 } 2115 2116 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset, 2117 PreallocMode prealloc, Error **errp) 2118 { 2119 IscsiLun *iscsilun = bs->opaque; 2120 Error *local_err = NULL; 2121 2122 if (prealloc != PREALLOC_MODE_OFF) { 2123 error_setg(errp, "Unsupported preallocation mode '%s'", 2124 PreallocMode_str(prealloc)); 2125 return -ENOTSUP; 2126 } 2127 2128 if (iscsilun->type != TYPE_DISK) { 2129 error_setg(errp, "Cannot resize non-disk iSCSI devices"); 2130 return -ENOTSUP; 2131 } 2132 2133 iscsi_readcapacity_sync(iscsilun, &local_err); 2134 if (local_err != NULL) { 2135 error_propagate(errp, local_err); 2136 return -EIO; 2137 } 2138 2139 if (offset > iscsi_getlength(bs)) { 2140 error_setg(errp, "Cannot grow iSCSI devices"); 2141 return -EINVAL; 2142 } 2143 2144 if (iscsilun->allocmap != NULL) { 2145 iscsi_allocmap_init(iscsilun, bs->open_flags); 2146 } 2147 2148 return 0; 2149 } 2150 2151 static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts, 2152 Error **errp) 2153 { 2154 int ret = 0; 2155 int64_t total_size = 0; 2156 BlockDriverState *bs; 2157 IscsiLun *iscsilun = NULL; 2158 QDict *bs_options; 2159 Error *local_err = NULL; 2160 2161 bs = bdrv_new(); 2162 2163 /* Read out options */ 2164 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2165 BDRV_SECTOR_SIZE); 2166 bs->opaque = g_new0(struct IscsiLun, 1); 2167 iscsilun = bs->opaque; 2168 2169 bs_options = qdict_new(); 2170 iscsi_parse_filename(filename, bs_options, &local_err); 2171 if (local_err) { 2172 error_propagate(errp, local_err); 2173 ret = -EINVAL; 2174 } else { 2175 ret = iscsi_open(bs, bs_options, 0, NULL); 2176 } 2177 qobject_unref(bs_options); 2178 2179 if (ret != 0) { 2180 goto out; 2181 } 2182 iscsi_detach_aio_context(bs); 2183 if (iscsilun->type != TYPE_DISK) { 2184 ret = -ENODEV; 2185 goto out; 2186 } 2187 if (bs->total_sectors < total_size) { 2188 ret = -ENOSPC; 2189 goto out; 2190 } 2191 2192 ret = 0; 2193 out: 2194 if (iscsilun->iscsi != NULL) { 2195 iscsi_destroy_context(iscsilun->iscsi); 2196 } 2197 g_free(bs->opaque); 2198 bs->opaque = NULL; 2199 bdrv_unref(bs); 2200 return ret; 2201 } 2202 2203 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2204 { 2205 IscsiLun *iscsilun = bs->opaque; 2206 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2207 bdi->cluster_size = iscsilun->cluster_size; 2208 return 0; 2209 } 2210 2211 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs, 2212 Error **errp) 2213 { 2214 IscsiLun *iscsilun = bs->opaque; 2215 iscsi_allocmap_invalidate(iscsilun); 2216 } 2217 2218 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs, 2219 BdrvChild *src, 2220 uint64_t src_offset, 2221 BdrvChild *dst, 2222 uint64_t dst_offset, 2223 uint64_t bytes, 2224 BdrvRequestFlags read_flags, 2225 BdrvRequestFlags write_flags) 2226 { 2227 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, 2228 read_flags, write_flags); 2229 } 2230 2231 static struct scsi_task *iscsi_xcopy_task(int param_len) 2232 { 2233 struct scsi_task *task; 2234 2235 task = g_new0(struct scsi_task, 1); 2236 2237 task->cdb[0] = EXTENDED_COPY; 2238 task->cdb[10] = (param_len >> 24) & 0xFF; 2239 task->cdb[11] = (param_len >> 16) & 0xFF; 2240 task->cdb[12] = (param_len >> 8) & 0xFF; 2241 task->cdb[13] = param_len & 0xFF; 2242 task->cdb_size = 16; 2243 task->xfer_dir = SCSI_XFER_WRITE; 2244 task->expxferlen = param_len; 2245 2246 return task; 2247 } 2248 2249 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun) 2250 { 2251 struct scsi_inquiry_device_designator *dd = lun->dd; 2252 2253 memset(desc, 0, 32); 2254 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */ 2255 desc[4] = dd->code_set; 2256 desc[5] = (dd->designator_type & 0xF) 2257 | ((dd->association & 3) << 4); 2258 desc[7] = dd->designator_length; 2259 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20)); 2260 2261 desc[28] = 0; 2262 desc[29] = (lun->block_size >> 16) & 0xFF; 2263 desc[30] = (lun->block_size >> 8) & 0xFF; 2264 desc[31] = lun->block_size & 0xFF; 2265 } 2266 2267 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index, 2268 int dst_index) 2269 { 2270 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */ 2271 hdr[1] = ((dc << 1) | cat) & 0xFF; 2272 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF; 2273 /* don't account for the first 4 bytes in descriptor header*/ 2274 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF; 2275 hdr[4] = (src_index >> 8) & 0xFF; 2276 hdr[5] = src_index & 0xFF; 2277 hdr[6] = (dst_index >> 8) & 0xFF; 2278 hdr[7] = dst_index & 0xFF; 2279 } 2280 2281 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat, 2282 int src_index, int dst_index, int num_blks, 2283 uint64_t src_lba, uint64_t dst_lba) 2284 { 2285 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index); 2286 2287 /* The caller should verify the request size */ 2288 assert(num_blks < 65536); 2289 desc[10] = (num_blks >> 8) & 0xFF; 2290 desc[11] = num_blks & 0xFF; 2291 desc[12] = (src_lba >> 56) & 0xFF; 2292 desc[13] = (src_lba >> 48) & 0xFF; 2293 desc[14] = (src_lba >> 40) & 0xFF; 2294 desc[15] = (src_lba >> 32) & 0xFF; 2295 desc[16] = (src_lba >> 24) & 0xFF; 2296 desc[17] = (src_lba >> 16) & 0xFF; 2297 desc[18] = (src_lba >> 8) & 0xFF; 2298 desc[19] = src_lba & 0xFF; 2299 desc[20] = (dst_lba >> 56) & 0xFF; 2300 desc[21] = (dst_lba >> 48) & 0xFF; 2301 desc[22] = (dst_lba >> 40) & 0xFF; 2302 desc[23] = (dst_lba >> 32) & 0xFF; 2303 desc[24] = (dst_lba >> 24) & 0xFF; 2304 desc[25] = (dst_lba >> 16) & 0xFF; 2305 desc[26] = (dst_lba >> 8) & 0xFF; 2306 desc[27] = dst_lba & 0xFF; 2307 } 2308 2309 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str, 2310 int list_id_usage, int prio, 2311 int tgt_desc_len, 2312 int seg_desc_len, int inline_data_len) 2313 { 2314 buf[0] = list_id; 2315 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7); 2316 buf[2] = (tgt_desc_len >> 8) & 0xFF; 2317 buf[3] = tgt_desc_len & 0xFF; 2318 buf[8] = (seg_desc_len >> 24) & 0xFF; 2319 buf[9] = (seg_desc_len >> 16) & 0xFF; 2320 buf[10] = (seg_desc_len >> 8) & 0xFF; 2321 buf[11] = seg_desc_len & 0xFF; 2322 buf[12] = (inline_data_len >> 24) & 0xFF; 2323 buf[13] = (inline_data_len >> 16) & 0xFF; 2324 buf[14] = (inline_data_len >> 8) & 0xFF; 2325 buf[15] = inline_data_len & 0xFF; 2326 } 2327 2328 static void iscsi_xcopy_data(struct iscsi_data *data, 2329 IscsiLun *src, int64_t src_lba, 2330 IscsiLun *dst, int64_t dst_lba, 2331 uint16_t num_blocks) 2332 { 2333 uint8_t *buf; 2334 const int src_offset = XCOPY_DESC_OFFSET; 2335 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE; 2336 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE; 2337 2338 data->size = XCOPY_DESC_OFFSET + 2339 IDENT_DESCR_TGT_DESCR_SIZE * 2 + 2340 XCOPY_BLK2BLK_SEG_DESC_SIZE; 2341 data->data = g_malloc0(data->size); 2342 buf = data->data; 2343 2344 /* Initialise the parameter list header */ 2345 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */, 2346 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE, 2347 XCOPY_BLK2BLK_SEG_DESC_SIZE, 2348 0); 2349 2350 /* Initialise CSCD list with one src + one dst descriptor */ 2351 iscsi_populate_target_desc(&buf[src_offset], src); 2352 iscsi_populate_target_desc(&buf[dst_offset], dst); 2353 2354 /* Initialise one segment descriptor */ 2355 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks, 2356 src_lba, dst_lba); 2357 } 2358 2359 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs, 2360 BdrvChild *src, 2361 uint64_t src_offset, 2362 BdrvChild *dst, 2363 uint64_t dst_offset, 2364 uint64_t bytes, 2365 BdrvRequestFlags read_flags, 2366 BdrvRequestFlags write_flags) 2367 { 2368 IscsiLun *dst_lun = dst->bs->opaque; 2369 IscsiLun *src_lun; 2370 struct IscsiTask iscsi_task; 2371 struct iscsi_data data; 2372 int r = 0; 2373 int block_size; 2374 2375 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) { 2376 return -ENOTSUP; 2377 } 2378 src_lun = src->bs->opaque; 2379 2380 if (!src_lun->dd || !dst_lun->dd) { 2381 return -ENOTSUP; 2382 } 2383 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) { 2384 return -ENOTSUP; 2385 } 2386 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) { 2387 return -ENOTSUP; 2388 } 2389 if (dst_lun->block_size != src_lun->block_size || 2390 !dst_lun->block_size) { 2391 return -ENOTSUP; 2392 } 2393 2394 block_size = dst_lun->block_size; 2395 if (bytes / block_size > 65535) { 2396 return -ENOTSUP; 2397 } 2398 2399 iscsi_xcopy_data(&data, 2400 src_lun, src_offset / block_size, 2401 dst_lun, dst_offset / block_size, 2402 bytes / block_size); 2403 2404 iscsi_co_init_iscsitask(dst_lun, &iscsi_task); 2405 2406 qemu_mutex_lock(&dst_lun->mutex); 2407 iscsi_task.task = iscsi_xcopy_task(data.size); 2408 retry: 2409 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun, 2410 iscsi_task.task, iscsi_co_generic_cb, 2411 &data, 2412 &iscsi_task) != 0) { 2413 r = -EIO; 2414 goto out_unlock; 2415 } 2416 2417 iscsi_co_wait_for_task(&iscsi_task, dst_lun); 2418 2419 if (iscsi_task.do_retry) { 2420 iscsi_task.complete = 0; 2421 goto retry; 2422 } 2423 2424 if (iscsi_task.status != SCSI_STATUS_GOOD) { 2425 r = iscsi_task.err_code; 2426 goto out_unlock; 2427 } 2428 2429 out_unlock: 2430 2431 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r); 2432 g_free(iscsi_task.task); 2433 qemu_mutex_unlock(&dst_lun->mutex); 2434 g_free(iscsi_task.err_str); 2435 return r; 2436 } 2437 2438 static QemuOptsList iscsi_create_opts = { 2439 .name = "iscsi-create-opts", 2440 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2441 .desc = { 2442 { 2443 .name = BLOCK_OPT_SIZE, 2444 .type = QEMU_OPT_SIZE, 2445 .help = "Virtual disk size" 2446 }, 2447 { /* end of list */ } 2448 } 2449 }; 2450 2451 static BlockDriver bdrv_iscsi = { 2452 .format_name = "iscsi", 2453 .protocol_name = "iscsi", 2454 2455 .instance_size = sizeof(IscsiLun), 2456 .bdrv_parse_filename = iscsi_parse_filename, 2457 .bdrv_file_open = iscsi_open, 2458 .bdrv_close = iscsi_close, 2459 .bdrv_co_create_opts = iscsi_co_create_opts, 2460 .create_opts = &iscsi_create_opts, 2461 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2462 .bdrv_reopen_commit = iscsi_reopen_commit, 2463 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2464 2465 .bdrv_getlength = iscsi_getlength, 2466 .bdrv_get_info = iscsi_get_info, 2467 .bdrv_co_truncate = iscsi_co_truncate, 2468 .bdrv_refresh_limits = iscsi_refresh_limits, 2469 2470 .bdrv_co_block_status = iscsi_co_block_status, 2471 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2472 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2473 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2474 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2475 .bdrv_co_readv = iscsi_co_readv, 2476 .bdrv_co_writev = iscsi_co_writev, 2477 .bdrv_co_flush_to_disk = iscsi_co_flush, 2478 2479 #ifdef __linux__ 2480 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2481 #endif 2482 2483 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2484 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2485 }; 2486 2487 #if LIBISCSI_API_VERSION >= (20160603) 2488 static BlockDriver bdrv_iser = { 2489 .format_name = "iser", 2490 .protocol_name = "iser", 2491 2492 .instance_size = sizeof(IscsiLun), 2493 .bdrv_parse_filename = iscsi_parse_filename, 2494 .bdrv_file_open = iscsi_open, 2495 .bdrv_close = iscsi_close, 2496 .bdrv_co_create_opts = iscsi_co_create_opts, 2497 .create_opts = &iscsi_create_opts, 2498 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2499 .bdrv_reopen_commit = iscsi_reopen_commit, 2500 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache, 2501 2502 .bdrv_getlength = iscsi_getlength, 2503 .bdrv_get_info = iscsi_get_info, 2504 .bdrv_co_truncate = iscsi_co_truncate, 2505 .bdrv_refresh_limits = iscsi_refresh_limits, 2506 2507 .bdrv_co_block_status = iscsi_co_block_status, 2508 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2509 .bdrv_co_copy_range_from = iscsi_co_copy_range_from, 2510 .bdrv_co_copy_range_to = iscsi_co_copy_range_to, 2511 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2512 .bdrv_co_readv = iscsi_co_readv, 2513 .bdrv_co_writev = iscsi_co_writev, 2514 .bdrv_co_flush_to_disk = iscsi_co_flush, 2515 2516 #ifdef __linux__ 2517 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2518 #endif 2519 2520 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2521 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2522 }; 2523 #endif 2524 2525 static void iscsi_block_init(void) 2526 { 2527 bdrv_register(&bdrv_iscsi); 2528 #if LIBISCSI_API_VERSION >= (20160603) 2529 bdrv_register(&bdrv_iser); 2530 #endif 2531 } 2532 2533 block_init(iscsi_block_init); 2534