1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2016 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/scsi.h" 38 #include "qemu/iov.h" 39 #include "qemu/uuid.h" 40 #include "qmp-commands.h" 41 #include "qapi/qmp/qstring.h" 42 #include "crypto/secret.h" 43 44 #include <iscsi/iscsi.h> 45 #include <iscsi/scsi-lowlevel.h> 46 47 #ifdef __linux__ 48 #include <scsi/sg.h> 49 #endif 50 51 typedef struct IscsiLun { 52 struct iscsi_context *iscsi; 53 AioContext *aio_context; 54 int lun; 55 enum scsi_inquiry_peripheral_device_type type; 56 int block_size; 57 uint64_t num_blocks; 58 int events; 59 QEMUTimer *nop_timer; 60 QEMUTimer *event_timer; 61 struct scsi_inquiry_logical_block_provisioning lbp; 62 struct scsi_inquiry_block_limits bl; 63 unsigned char *zeroblock; 64 /* The allocmap tracks which clusters (pages) on the iSCSI target are 65 * allocated and which are not. In case a target returns zeros for 66 * unallocated pages (iscsilun->lprz) we can directly return zeros instead 67 * of reading zeros over the wire if a read request falls within an 68 * unallocated block. As there are 3 possible states we need 2 bitmaps to 69 * track. allocmap_valid keeps track if QEMU's information about a page is 70 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no 71 * valid information about a page the corresponding allocmap entry should be 72 * switched to unallocated as well to force a new lookup of the allocation 73 * status as lookups are generally skipped if a page is suspect to be 74 * allocated. If a iSCSI target is opened with cache.direct = on the 75 * allocmap_valid does not exist turning all cached information invalid so 76 * that a fresh lookup is made for any page even if allocmap entry returns 77 * it's unallocated. */ 78 unsigned long *allocmap; 79 unsigned long *allocmap_valid; 80 long allocmap_size; 81 int cluster_sectors; 82 bool use_16_for_rw; 83 bool write_protected; 84 bool lbpme; 85 bool lbprz; 86 bool dpofua; 87 bool has_write_same; 88 bool request_timed_out; 89 } IscsiLun; 90 91 typedef struct IscsiTask { 92 int status; 93 int complete; 94 int retries; 95 int do_retry; 96 struct scsi_task *task; 97 Coroutine *co; 98 IscsiLun *iscsilun; 99 QEMUTimer retry_timer; 100 int err_code; 101 } IscsiTask; 102 103 typedef struct IscsiAIOCB { 104 BlockAIOCB common; 105 QEMUIOVector *qiov; 106 QEMUBH *bh; 107 IscsiLun *iscsilun; 108 struct scsi_task *task; 109 uint8_t *buf; 110 int status; 111 int64_t sector_num; 112 int nb_sectors; 113 int ret; 114 #ifdef __linux__ 115 sg_io_hdr_t *ioh; 116 #endif 117 } IscsiAIOCB; 118 119 /* libiscsi uses time_t so its enough to process events every second */ 120 #define EVENT_INTERVAL 1000 121 #define NOP_INTERVAL 5000 122 #define MAX_NOP_FAILURES 3 123 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 124 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 125 126 /* this threshold is a trade-off knob to choose between 127 * the potential additional overhead of an extra GET_LBA_STATUS request 128 * vs. unnecessarily reading a lot of zero sectors over the wire. 129 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 130 * sectors we check the allocation status of the area covered by the 131 * request first if the allocationmap indicates that the area might be 132 * unallocated. */ 133 #define ISCSI_CHECKALLOC_THRES 64 134 135 static void 136 iscsi_bh_cb(void *p) 137 { 138 IscsiAIOCB *acb = p; 139 140 qemu_bh_delete(acb->bh); 141 142 g_free(acb->buf); 143 acb->buf = NULL; 144 145 acb->common.cb(acb->common.opaque, acb->status); 146 147 if (acb->task != NULL) { 148 scsi_free_scsi_task(acb->task); 149 acb->task = NULL; 150 } 151 152 qemu_aio_unref(acb); 153 } 154 155 static void 156 iscsi_schedule_bh(IscsiAIOCB *acb) 157 { 158 if (acb->bh) { 159 return; 160 } 161 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 162 qemu_bh_schedule(acb->bh); 163 } 164 165 static void iscsi_co_generic_bh_cb(void *opaque) 166 { 167 struct IscsiTask *iTask = opaque; 168 iTask->complete = 1; 169 qemu_coroutine_enter(iTask->co); 170 } 171 172 static void iscsi_retry_timer_expired(void *opaque) 173 { 174 struct IscsiTask *iTask = opaque; 175 iTask->complete = 1; 176 if (iTask->co) { 177 qemu_coroutine_enter(iTask->co); 178 } 179 } 180 181 static inline unsigned exp_random(double mean) 182 { 183 return -mean * log((double)rand() / RAND_MAX); 184 } 185 186 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 187 * libiscsi 1.10.0, together with other constants we need. Use it as 188 * a hint that we have to define them ourselves if needed, to keep the 189 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 190 * the test because SCSI_STATUS_* is an enum. 191 * 192 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 193 * an enum, check against the LIBISCSI_API_VERSION macro, which was 194 * introduced in 1.11.0. If it is present, there is no need to define 195 * anything. 196 */ 197 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 198 !defined(LIBISCSI_API_VERSION) 199 #define SCSI_STATUS_TASK_SET_FULL 0x28 200 #define SCSI_STATUS_TIMEOUT 0x0f000002 201 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 202 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 203 #endif 204 205 #ifndef LIBISCSI_API_VERSION 206 #define LIBISCSI_API_VERSION 20130701 207 #endif 208 209 static int iscsi_translate_sense(struct scsi_sense *sense) 210 { 211 int ret; 212 213 switch (sense->key) { 214 case SCSI_SENSE_NOT_READY: 215 return -EBUSY; 216 case SCSI_SENSE_DATA_PROTECTION: 217 return -EACCES; 218 case SCSI_SENSE_COMMAND_ABORTED: 219 return -ECANCELED; 220 case SCSI_SENSE_ILLEGAL_REQUEST: 221 /* Parse ASCQ */ 222 break; 223 default: 224 return -EIO; 225 } 226 switch (sense->ascq) { 227 case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR: 228 case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE: 229 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB: 230 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST: 231 ret = -EINVAL; 232 break; 233 case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE: 234 ret = -ENOSPC; 235 break; 236 case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED: 237 ret = -ENOTSUP; 238 break; 239 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT: 240 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED: 241 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN: 242 ret = -ENOMEDIUM; 243 break; 244 case SCSI_SENSE_ASCQ_WRITE_PROTECTED: 245 ret = -EACCES; 246 break; 247 default: 248 ret = -EIO; 249 break; 250 } 251 return ret; 252 } 253 254 static void 255 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 256 void *command_data, void *opaque) 257 { 258 struct IscsiTask *iTask = opaque; 259 struct scsi_task *task = command_data; 260 261 iTask->status = status; 262 iTask->do_retry = 0; 263 iTask->task = task; 264 265 if (status != SCSI_STATUS_GOOD) { 266 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 267 if (status == SCSI_STATUS_CHECK_CONDITION 268 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 269 error_report("iSCSI CheckCondition: %s", 270 iscsi_get_error(iscsi)); 271 iTask->do_retry = 1; 272 goto out; 273 } 274 if (status == SCSI_STATUS_BUSY || 275 status == SCSI_STATUS_TIMEOUT || 276 status == SCSI_STATUS_TASK_SET_FULL) { 277 unsigned retry_time = 278 exp_random(iscsi_retry_times[iTask->retries - 1]); 279 if (status == SCSI_STATUS_TIMEOUT) { 280 /* make sure the request is rescheduled AFTER the 281 * reconnect is initiated */ 282 retry_time = EVENT_INTERVAL * 2; 283 iTask->iscsilun->request_timed_out = true; 284 } 285 error_report("iSCSI Busy/TaskSetFull/TimeOut" 286 " (retry #%u in %u ms): %s", 287 iTask->retries, retry_time, 288 iscsi_get_error(iscsi)); 289 aio_timer_init(iTask->iscsilun->aio_context, 290 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 291 SCALE_MS, iscsi_retry_timer_expired, iTask); 292 timer_mod(&iTask->retry_timer, 293 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 294 iTask->do_retry = 1; 295 return; 296 } 297 } 298 iTask->err_code = iscsi_translate_sense(&task->sense); 299 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 300 } 301 302 out: 303 if (iTask->co) { 304 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 305 iscsi_co_generic_bh_cb, iTask); 306 } else { 307 iTask->complete = 1; 308 } 309 } 310 311 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 312 { 313 *iTask = (struct IscsiTask) { 314 .co = qemu_coroutine_self(), 315 .iscsilun = iscsilun, 316 }; 317 } 318 319 static void 320 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 321 void *private_data) 322 { 323 IscsiAIOCB *acb = private_data; 324 325 acb->status = -ECANCELED; 326 iscsi_schedule_bh(acb); 327 } 328 329 static void 330 iscsi_aio_cancel(BlockAIOCB *blockacb) 331 { 332 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 333 IscsiLun *iscsilun = acb->iscsilun; 334 335 if (acb->status != -EINPROGRESS) { 336 return; 337 } 338 339 /* send a task mgmt call to the target to cancel the task on the target */ 340 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 341 iscsi_abort_task_cb, acb); 342 343 } 344 345 static const AIOCBInfo iscsi_aiocb_info = { 346 .aiocb_size = sizeof(IscsiAIOCB), 347 .cancel_async = iscsi_aio_cancel, 348 }; 349 350 351 static void iscsi_process_read(void *arg); 352 static void iscsi_process_write(void *arg); 353 354 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 /* check for timed out requests */ 376 iscsi_service(iscsilun->iscsi, 0); 377 378 if (iscsilun->request_timed_out) { 379 iscsilun->request_timed_out = false; 380 iscsi_reconnect(iscsilun->iscsi); 381 } 382 383 /* newer versions of libiscsi may return zero events. Ensure we are able 384 * to return to service once this situation changes. */ 385 iscsi_set_events(iscsilun); 386 387 timer_mod(iscsilun->event_timer, 388 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 389 } 390 391 static void 392 iscsi_process_read(void *arg) 393 { 394 IscsiLun *iscsilun = arg; 395 struct iscsi_context *iscsi = iscsilun->iscsi; 396 397 iscsi_service(iscsi, POLLIN); 398 iscsi_set_events(iscsilun); 399 } 400 401 static void 402 iscsi_process_write(void *arg) 403 { 404 IscsiLun *iscsilun = arg; 405 struct iscsi_context *iscsi = iscsilun->iscsi; 406 407 iscsi_service(iscsi, POLLOUT); 408 iscsi_set_events(iscsilun); 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 iscsilun->allocmap_size = 457 DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun), 458 iscsilun->cluster_sectors); 459 460 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 461 if (!iscsilun->allocmap) { 462 return -ENOMEM; 463 } 464 465 if (open_flags & BDRV_O_NOCACHE) { 466 /* in case that cache.direct = on all allocmap entries are 467 * treated as invalid to force a relookup of the block 468 * status on every read request */ 469 return 0; 470 } 471 472 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 473 if (!iscsilun->allocmap_valid) { 474 /* if we are under memory pressure free the allocmap as well */ 475 iscsi_allocmap_free(iscsilun); 476 return -ENOMEM; 477 } 478 479 return 0; 480 } 481 482 static void 483 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num, 484 int nb_sectors, bool allocated, bool valid) 485 { 486 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 487 488 if (iscsilun->allocmap == NULL) { 489 return; 490 } 491 /* expand to entirely contain all affected clusters */ 492 cl_num_expanded = sector_num / iscsilun->cluster_sectors; 493 nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors, 494 iscsilun->cluster_sectors) - cl_num_expanded; 495 /* shrink to touch only completely contained clusters */ 496 cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 497 nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors 498 - cl_num_shrunk; 499 if (allocated) { 500 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 501 } else { 502 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 503 } 504 505 if (iscsilun->allocmap_valid == NULL) { 506 return; 507 } 508 if (valid) { 509 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 510 } else { 511 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 512 nb_cls_expanded); 513 } 514 } 515 516 static void 517 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num, 518 int nb_sectors) 519 { 520 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true); 521 } 522 523 static void 524 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num, 525 int nb_sectors) 526 { 527 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 528 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 529 */ 530 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true); 531 } 532 533 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num, 534 int nb_sectors) 535 { 536 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false); 537 } 538 539 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 540 { 541 if (iscsilun->allocmap) { 542 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 543 } 544 if (iscsilun->allocmap_valid) { 545 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 546 } 547 } 548 549 static inline bool 550 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num, 551 int nb_sectors) 552 { 553 unsigned long size; 554 if (iscsilun->allocmap == NULL) { 555 return true; 556 } 557 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 558 return !(find_next_bit(iscsilun->allocmap, size, 559 sector_num / iscsilun->cluster_sectors) == size); 560 } 561 562 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 563 int64_t sector_num, int nb_sectors) 564 { 565 unsigned long size; 566 if (iscsilun->allocmap_valid == NULL) { 567 return false; 568 } 569 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 570 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 571 sector_num / iscsilun->cluster_sectors) == size); 572 } 573 574 static int coroutine_fn 575 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 576 QEMUIOVector *iov, int flags) 577 { 578 IscsiLun *iscsilun = bs->opaque; 579 struct IscsiTask iTask; 580 uint64_t lba; 581 uint32_t num_sectors; 582 bool fua = flags & BDRV_REQ_FUA; 583 584 if (fua) { 585 assert(iscsilun->dpofua); 586 } 587 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 588 return -EINVAL; 589 } 590 591 if (bs->bl.max_transfer) { 592 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 593 } 594 595 lba = sector_qemu2lun(sector_num, iscsilun); 596 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 597 iscsi_co_init_iscsitask(iscsilun, &iTask); 598 retry: 599 if (iscsilun->use_16_for_rw) { 600 #if LIBISCSI_API_VERSION >= (20160603) 601 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 602 NULL, num_sectors * iscsilun->block_size, 603 iscsilun->block_size, 0, 0, fua, 0, 0, 604 iscsi_co_generic_cb, &iTask, 605 (struct scsi_iovec *)iov->iov, iov->niov); 606 } else { 607 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 608 NULL, num_sectors * iscsilun->block_size, 609 iscsilun->block_size, 0, 0, fua, 0, 0, 610 iscsi_co_generic_cb, &iTask, 611 (struct scsi_iovec *)iov->iov, iov->niov); 612 } 613 #else 614 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 615 NULL, num_sectors * iscsilun->block_size, 616 iscsilun->block_size, 0, 0, fua, 0, 0, 617 iscsi_co_generic_cb, &iTask); 618 } else { 619 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 620 NULL, num_sectors * iscsilun->block_size, 621 iscsilun->block_size, 0, 0, fua, 0, 0, 622 iscsi_co_generic_cb, &iTask); 623 } 624 #endif 625 if (iTask.task == NULL) { 626 return -ENOMEM; 627 } 628 #if LIBISCSI_API_VERSION < (20160603) 629 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 630 iov->niov); 631 #endif 632 while (!iTask.complete) { 633 iscsi_set_events(iscsilun); 634 qemu_coroutine_yield(); 635 } 636 637 if (iTask.task != NULL) { 638 scsi_free_scsi_task(iTask.task); 639 iTask.task = NULL; 640 } 641 642 if (iTask.do_retry) { 643 iTask.complete = 0; 644 goto retry; 645 } 646 647 if (iTask.status != SCSI_STATUS_GOOD) { 648 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors); 649 return iTask.err_code; 650 } 651 652 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors); 653 654 return 0; 655 } 656 657 658 659 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 660 int64_t sector_num, 661 int nb_sectors, int *pnum, 662 BlockDriverState **file) 663 { 664 IscsiLun *iscsilun = bs->opaque; 665 struct scsi_get_lba_status *lbas = NULL; 666 struct scsi_lba_status_descriptor *lbasd = NULL; 667 struct IscsiTask iTask; 668 int64_t ret; 669 670 iscsi_co_init_iscsitask(iscsilun, &iTask); 671 672 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 673 ret = -EINVAL; 674 goto out; 675 } 676 677 /* default to all sectors allocated */ 678 ret = BDRV_BLOCK_DATA; 679 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 680 *pnum = nb_sectors; 681 682 /* LUN does not support logical block provisioning */ 683 if (!iscsilun->lbpme) { 684 goto out; 685 } 686 687 retry: 688 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 689 sector_qemu2lun(sector_num, iscsilun), 690 8 + 16, iscsi_co_generic_cb, 691 &iTask) == NULL) { 692 ret = -ENOMEM; 693 goto out; 694 } 695 696 while (!iTask.complete) { 697 iscsi_set_events(iscsilun); 698 qemu_coroutine_yield(); 699 } 700 701 if (iTask.do_retry) { 702 if (iTask.task != NULL) { 703 scsi_free_scsi_task(iTask.task); 704 iTask.task = NULL; 705 } 706 iTask.complete = 0; 707 goto retry; 708 } 709 710 if (iTask.status != SCSI_STATUS_GOOD) { 711 /* in case the get_lba_status_callout fails (i.e. 712 * because the device is busy or the cmd is not 713 * supported) we pretend all blocks are allocated 714 * for backwards compatibility */ 715 goto out; 716 } 717 718 lbas = scsi_datain_unmarshall(iTask.task); 719 if (lbas == NULL) { 720 ret = -EIO; 721 goto out; 722 } 723 724 lbasd = &lbas->descriptors[0]; 725 726 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 727 ret = -EIO; 728 goto out; 729 } 730 731 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 732 733 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 734 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 735 ret &= ~BDRV_BLOCK_DATA; 736 if (iscsilun->lbprz) { 737 ret |= BDRV_BLOCK_ZERO; 738 } 739 } 740 741 if (ret & BDRV_BLOCK_ZERO) { 742 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum); 743 } else { 744 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum); 745 } 746 747 if (*pnum > nb_sectors) { 748 *pnum = nb_sectors; 749 } 750 out: 751 if (iTask.task != NULL) { 752 scsi_free_scsi_task(iTask.task); 753 } 754 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) { 755 *file = bs; 756 } 757 return ret; 758 } 759 760 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 761 int64_t sector_num, int nb_sectors, 762 QEMUIOVector *iov) 763 { 764 IscsiLun *iscsilun = bs->opaque; 765 struct IscsiTask iTask; 766 uint64_t lba; 767 uint32_t num_sectors; 768 769 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 770 return -EINVAL; 771 } 772 773 if (bs->bl.max_transfer) { 774 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 775 } 776 777 /* if cache.direct is off and we have a valid entry in our allocation map 778 * we can skip checking the block status and directly return zeroes if 779 * the request falls within an unallocated area */ 780 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 781 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 782 qemu_iovec_memset(iov, 0, 0x00, iov->size); 783 return 0; 784 } 785 786 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 787 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 788 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 789 int pnum; 790 BlockDriverState *file; 791 /* check the block status from the beginning of the cluster 792 * containing the start sector */ 793 int64_t ret = iscsi_co_get_block_status(bs, 794 sector_num - sector_num % iscsilun->cluster_sectors, 795 BDRV_REQUEST_MAX_SECTORS, &pnum, &file); 796 if (ret < 0) { 797 return ret; 798 } 799 /* if the whole request falls into an unallocated area we can avoid 800 * to read and directly return zeroes instead */ 801 if (ret & BDRV_BLOCK_ZERO && 802 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) { 803 qemu_iovec_memset(iov, 0, 0x00, iov->size); 804 return 0; 805 } 806 } 807 808 lba = sector_qemu2lun(sector_num, iscsilun); 809 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 810 811 iscsi_co_init_iscsitask(iscsilun, &iTask); 812 retry: 813 if (iscsilun->use_16_for_rw) { 814 #if LIBISCSI_API_VERSION >= (20160603) 815 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 816 num_sectors * iscsilun->block_size, 817 iscsilun->block_size, 0, 0, 0, 0, 0, 818 iscsi_co_generic_cb, &iTask, 819 (struct scsi_iovec *)iov->iov, iov->niov); 820 } else { 821 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 822 num_sectors * iscsilun->block_size, 823 iscsilun->block_size, 824 0, 0, 0, 0, 0, 825 iscsi_co_generic_cb, &iTask, 826 (struct scsi_iovec *)iov->iov, iov->niov); 827 } 828 #else 829 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 830 num_sectors * iscsilun->block_size, 831 iscsilun->block_size, 0, 0, 0, 0, 0, 832 iscsi_co_generic_cb, &iTask); 833 } else { 834 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 835 num_sectors * iscsilun->block_size, 836 iscsilun->block_size, 837 0, 0, 0, 0, 0, 838 iscsi_co_generic_cb, &iTask); 839 } 840 #endif 841 if (iTask.task == NULL) { 842 return -ENOMEM; 843 } 844 #if LIBISCSI_API_VERSION < (20160603) 845 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 846 #endif 847 while (!iTask.complete) { 848 iscsi_set_events(iscsilun); 849 qemu_coroutine_yield(); 850 } 851 852 if (iTask.task != NULL) { 853 scsi_free_scsi_task(iTask.task); 854 iTask.task = NULL; 855 } 856 857 if (iTask.do_retry) { 858 iTask.complete = 0; 859 goto retry; 860 } 861 862 if (iTask.status != SCSI_STATUS_GOOD) { 863 return iTask.err_code; 864 } 865 866 return 0; 867 } 868 869 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 870 { 871 IscsiLun *iscsilun = bs->opaque; 872 struct IscsiTask iTask; 873 874 iscsi_co_init_iscsitask(iscsilun, &iTask); 875 retry: 876 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 877 0, iscsi_co_generic_cb, &iTask) == NULL) { 878 return -ENOMEM; 879 } 880 881 while (!iTask.complete) { 882 iscsi_set_events(iscsilun); 883 qemu_coroutine_yield(); 884 } 885 886 if (iTask.task != NULL) { 887 scsi_free_scsi_task(iTask.task); 888 iTask.task = NULL; 889 } 890 891 if (iTask.do_retry) { 892 iTask.complete = 0; 893 goto retry; 894 } 895 896 if (iTask.status != SCSI_STATUS_GOOD) { 897 return iTask.err_code; 898 } 899 900 return 0; 901 } 902 903 #ifdef __linux__ 904 static void 905 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 906 void *command_data, void *opaque) 907 { 908 IscsiAIOCB *acb = opaque; 909 910 g_free(acb->buf); 911 acb->buf = NULL; 912 913 acb->status = 0; 914 if (status < 0) { 915 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 916 iscsi_get_error(iscsi)); 917 acb->status = iscsi_translate_sense(&acb->task->sense); 918 } 919 920 acb->ioh->driver_status = 0; 921 acb->ioh->host_status = 0; 922 acb->ioh->resid = 0; 923 acb->ioh->status = status; 924 925 #define SG_ERR_DRIVER_SENSE 0x08 926 927 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 928 int ss; 929 930 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 931 932 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 933 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 934 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 935 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 936 } 937 938 iscsi_schedule_bh(acb); 939 } 940 941 static void iscsi_ioctl_bh_completion(void *opaque) 942 { 943 IscsiAIOCB *acb = opaque; 944 945 qemu_bh_delete(acb->bh); 946 acb->common.cb(acb->common.opaque, acb->ret); 947 qemu_aio_unref(acb); 948 } 949 950 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 951 { 952 BlockDriverState *bs = acb->common.bs; 953 IscsiLun *iscsilun = bs->opaque; 954 int ret = 0; 955 956 switch (req) { 957 case SG_GET_VERSION_NUM: 958 *(int *)buf = 30000; 959 break; 960 case SG_GET_SCSI_ID: 961 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 962 break; 963 default: 964 ret = -EINVAL; 965 } 966 assert(!acb->bh); 967 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 968 iscsi_ioctl_bh_completion, acb); 969 acb->ret = ret; 970 qemu_bh_schedule(acb->bh); 971 } 972 973 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 974 unsigned long int req, void *buf, 975 BlockCompletionFunc *cb, void *opaque) 976 { 977 IscsiLun *iscsilun = bs->opaque; 978 struct iscsi_context *iscsi = iscsilun->iscsi; 979 struct iscsi_data data; 980 IscsiAIOCB *acb; 981 982 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 983 984 acb->iscsilun = iscsilun; 985 acb->bh = NULL; 986 acb->status = -EINPROGRESS; 987 acb->buf = NULL; 988 acb->ioh = buf; 989 990 if (req != SG_IO) { 991 iscsi_ioctl_handle_emulated(acb, req, buf); 992 return &acb->common; 993 } 994 995 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 996 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 997 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 998 qemu_aio_unref(acb); 999 return NULL; 1000 } 1001 1002 acb->task = malloc(sizeof(struct scsi_task)); 1003 if (acb->task == NULL) { 1004 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1005 iscsi_get_error(iscsi)); 1006 qemu_aio_unref(acb); 1007 return NULL; 1008 } 1009 memset(acb->task, 0, sizeof(struct scsi_task)); 1010 1011 switch (acb->ioh->dxfer_direction) { 1012 case SG_DXFER_TO_DEV: 1013 acb->task->xfer_dir = SCSI_XFER_WRITE; 1014 break; 1015 case SG_DXFER_FROM_DEV: 1016 acb->task->xfer_dir = SCSI_XFER_READ; 1017 break; 1018 default: 1019 acb->task->xfer_dir = SCSI_XFER_NONE; 1020 break; 1021 } 1022 1023 acb->task->cdb_size = acb->ioh->cmd_len; 1024 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1025 acb->task->expxferlen = acb->ioh->dxfer_len; 1026 1027 data.size = 0; 1028 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1029 if (acb->ioh->iovec_count == 0) { 1030 data.data = acb->ioh->dxferp; 1031 data.size = acb->ioh->dxfer_len; 1032 } else { 1033 scsi_task_set_iov_out(acb->task, 1034 (struct scsi_iovec *) acb->ioh->dxferp, 1035 acb->ioh->iovec_count); 1036 } 1037 } 1038 1039 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1040 iscsi_aio_ioctl_cb, 1041 (data.size > 0) ? &data : NULL, 1042 acb) != 0) { 1043 scsi_free_scsi_task(acb->task); 1044 qemu_aio_unref(acb); 1045 return NULL; 1046 } 1047 1048 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1049 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1050 if (acb->ioh->iovec_count == 0) { 1051 scsi_task_add_data_in_buffer(acb->task, 1052 acb->ioh->dxfer_len, 1053 acb->ioh->dxferp); 1054 } else { 1055 scsi_task_set_iov_in(acb->task, 1056 (struct scsi_iovec *) acb->ioh->dxferp, 1057 acb->ioh->iovec_count); 1058 } 1059 } 1060 1061 iscsi_set_events(iscsilun); 1062 1063 return &acb->common; 1064 } 1065 1066 #endif 1067 1068 static int64_t 1069 iscsi_getlength(BlockDriverState *bs) 1070 { 1071 IscsiLun *iscsilun = bs->opaque; 1072 int64_t len; 1073 1074 len = iscsilun->num_blocks; 1075 len *= iscsilun->block_size; 1076 1077 return len; 1078 } 1079 1080 static int 1081 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int count) 1082 { 1083 IscsiLun *iscsilun = bs->opaque; 1084 struct IscsiTask iTask; 1085 struct unmap_list list; 1086 1087 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) { 1088 return -ENOTSUP; 1089 } 1090 1091 if (!iscsilun->lbp.lbpu) { 1092 /* UNMAP is not supported by the target */ 1093 return 0; 1094 } 1095 1096 list.lba = offset / iscsilun->block_size; 1097 list.num = count / iscsilun->block_size; 1098 1099 iscsi_co_init_iscsitask(iscsilun, &iTask); 1100 retry: 1101 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1102 iscsi_co_generic_cb, &iTask) == NULL) { 1103 return -ENOMEM; 1104 } 1105 1106 while (!iTask.complete) { 1107 iscsi_set_events(iscsilun); 1108 qemu_coroutine_yield(); 1109 } 1110 1111 if (iTask.task != NULL) { 1112 scsi_free_scsi_task(iTask.task); 1113 iTask.task = NULL; 1114 } 1115 1116 if (iTask.do_retry) { 1117 iTask.complete = 0; 1118 goto retry; 1119 } 1120 1121 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1122 /* the target might fail with a check condition if it 1123 is not happy with the alignment of the UNMAP request 1124 we silently fail in this case */ 1125 return 0; 1126 } 1127 1128 if (iTask.status != SCSI_STATUS_GOOD) { 1129 return iTask.err_code; 1130 } 1131 1132 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1133 count >> BDRV_SECTOR_BITS); 1134 1135 return 0; 1136 } 1137 1138 static int 1139 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1140 int count, BdrvRequestFlags flags) 1141 { 1142 IscsiLun *iscsilun = bs->opaque; 1143 struct IscsiTask iTask; 1144 uint64_t lba; 1145 uint32_t nb_blocks; 1146 bool use_16_for_ws = iscsilun->use_16_for_rw; 1147 1148 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) { 1149 return -ENOTSUP; 1150 } 1151 1152 if (flags & BDRV_REQ_MAY_UNMAP) { 1153 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1154 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1155 use_16_for_ws = true; 1156 } 1157 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1158 /* WRITESAME16 with UNMAP is not supported by the target, 1159 * fall back and try WRITESAME10/16 without UNMAP */ 1160 flags &= ~BDRV_REQ_MAY_UNMAP; 1161 use_16_for_ws = iscsilun->use_16_for_rw; 1162 } 1163 } 1164 1165 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1166 /* WRITESAME without UNMAP is not supported by the target */ 1167 return -ENOTSUP; 1168 } 1169 1170 lba = offset / iscsilun->block_size; 1171 nb_blocks = count / iscsilun->block_size; 1172 1173 if (iscsilun->zeroblock == NULL) { 1174 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1175 if (iscsilun->zeroblock == NULL) { 1176 return -ENOMEM; 1177 } 1178 } 1179 1180 iscsi_co_init_iscsitask(iscsilun, &iTask); 1181 retry: 1182 if (use_16_for_ws) { 1183 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1184 iscsilun->zeroblock, iscsilun->block_size, 1185 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1186 0, 0, iscsi_co_generic_cb, &iTask); 1187 } else { 1188 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1189 iscsilun->zeroblock, iscsilun->block_size, 1190 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1191 0, 0, iscsi_co_generic_cb, &iTask); 1192 } 1193 if (iTask.task == NULL) { 1194 return -ENOMEM; 1195 } 1196 1197 while (!iTask.complete) { 1198 iscsi_set_events(iscsilun); 1199 qemu_coroutine_yield(); 1200 } 1201 1202 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1203 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1204 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1205 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1206 /* WRITE SAME is not supported by the target */ 1207 iscsilun->has_write_same = false; 1208 scsi_free_scsi_task(iTask.task); 1209 return -ENOTSUP; 1210 } 1211 1212 if (iTask.task != NULL) { 1213 scsi_free_scsi_task(iTask.task); 1214 iTask.task = NULL; 1215 } 1216 1217 if (iTask.do_retry) { 1218 iTask.complete = 0; 1219 goto retry; 1220 } 1221 1222 if (iTask.status != SCSI_STATUS_GOOD) { 1223 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1224 count >> BDRV_SECTOR_BITS); 1225 return iTask.err_code; 1226 } 1227 1228 if (flags & BDRV_REQ_MAY_UNMAP) { 1229 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1230 count >> BDRV_SECTOR_BITS); 1231 } else { 1232 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS, 1233 count >> BDRV_SECTOR_BITS); 1234 } 1235 1236 return 0; 1237 } 1238 1239 static void parse_chap(struct iscsi_context *iscsi, const char *target, 1240 Error **errp) 1241 { 1242 QemuOptsList *list; 1243 QemuOpts *opts; 1244 const char *user = NULL; 1245 const char *password = NULL; 1246 const char *secretid; 1247 char *secret = NULL; 1248 1249 list = qemu_find_opts("iscsi"); 1250 if (!list) { 1251 return; 1252 } 1253 1254 opts = qemu_opts_find(list, target); 1255 if (opts == NULL) { 1256 opts = QTAILQ_FIRST(&list->head); 1257 if (!opts) { 1258 return; 1259 } 1260 } 1261 1262 user = qemu_opt_get(opts, "user"); 1263 if (!user) { 1264 return; 1265 } 1266 1267 secretid = qemu_opt_get(opts, "password-secret"); 1268 password = qemu_opt_get(opts, "password"); 1269 if (secretid && password) { 1270 error_setg(errp, "'password' and 'password-secret' properties are " 1271 "mutually exclusive"); 1272 return; 1273 } 1274 if (secretid) { 1275 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1276 if (!secret) { 1277 return; 1278 } 1279 password = secret; 1280 } else if (!password) { 1281 error_setg(errp, "CHAP username specified but no password was given"); 1282 return; 1283 } 1284 1285 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1286 error_setg(errp, "Failed to set initiator username and password"); 1287 } 1288 1289 g_free(secret); 1290 } 1291 1292 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 1293 Error **errp) 1294 { 1295 QemuOptsList *list; 1296 QemuOpts *opts; 1297 const char *digest = NULL; 1298 1299 list = qemu_find_opts("iscsi"); 1300 if (!list) { 1301 return; 1302 } 1303 1304 opts = qemu_opts_find(list, target); 1305 if (opts == NULL) { 1306 opts = QTAILQ_FIRST(&list->head); 1307 if (!opts) { 1308 return; 1309 } 1310 } 1311 1312 digest = qemu_opt_get(opts, "header-digest"); 1313 if (!digest) { 1314 return; 1315 } 1316 1317 if (!strcmp(digest, "CRC32C")) { 1318 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1319 } else if (!strcmp(digest, "NONE")) { 1320 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1321 } else if (!strcmp(digest, "CRC32C-NONE")) { 1322 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1323 } else if (!strcmp(digest, "NONE-CRC32C")) { 1324 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1325 } else { 1326 error_setg(errp, "Invalid header-digest setting : %s", digest); 1327 } 1328 } 1329 1330 static char *parse_initiator_name(const char *target) 1331 { 1332 QemuOptsList *list; 1333 QemuOpts *opts; 1334 const char *name; 1335 char *iscsi_name; 1336 UuidInfo *uuid_info; 1337 1338 list = qemu_find_opts("iscsi"); 1339 if (list) { 1340 opts = qemu_opts_find(list, target); 1341 if (!opts) { 1342 opts = QTAILQ_FIRST(&list->head); 1343 } 1344 if (opts) { 1345 name = qemu_opt_get(opts, "initiator-name"); 1346 if (name) { 1347 return g_strdup(name); 1348 } 1349 } 1350 } 1351 1352 uuid_info = qmp_query_uuid(NULL); 1353 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1354 name = qemu_get_vm_name(); 1355 } else { 1356 name = uuid_info->UUID; 1357 } 1358 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1359 name ? ":" : "", name ? name : ""); 1360 qapi_free_UuidInfo(uuid_info); 1361 return iscsi_name; 1362 } 1363 1364 static int parse_timeout(const char *target) 1365 { 1366 QemuOptsList *list; 1367 QemuOpts *opts; 1368 const char *timeout; 1369 1370 list = qemu_find_opts("iscsi"); 1371 if (list) { 1372 opts = qemu_opts_find(list, target); 1373 if (!opts) { 1374 opts = QTAILQ_FIRST(&list->head); 1375 } 1376 if (opts) { 1377 timeout = qemu_opt_get(opts, "timeout"); 1378 if (timeout) { 1379 return atoi(timeout); 1380 } 1381 } 1382 } 1383 1384 return 0; 1385 } 1386 1387 static void iscsi_nop_timed_event(void *opaque) 1388 { 1389 IscsiLun *iscsilun = opaque; 1390 1391 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1392 error_report("iSCSI: NOP timeout. Reconnecting..."); 1393 iscsilun->request_timed_out = true; 1394 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1395 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1396 return; 1397 } 1398 1399 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1400 iscsi_set_events(iscsilun); 1401 } 1402 1403 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1404 { 1405 struct scsi_task *task = NULL; 1406 struct scsi_readcapacity10 *rc10 = NULL; 1407 struct scsi_readcapacity16 *rc16 = NULL; 1408 int retries = ISCSI_CMD_RETRIES; 1409 1410 do { 1411 if (task != NULL) { 1412 scsi_free_scsi_task(task); 1413 task = NULL; 1414 } 1415 1416 switch (iscsilun->type) { 1417 case TYPE_DISK: 1418 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1419 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1420 rc16 = scsi_datain_unmarshall(task); 1421 if (rc16 == NULL) { 1422 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1423 } else { 1424 iscsilun->block_size = rc16->block_length; 1425 iscsilun->num_blocks = rc16->returned_lba + 1; 1426 iscsilun->lbpme = !!rc16->lbpme; 1427 iscsilun->lbprz = !!rc16->lbprz; 1428 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1429 } 1430 break; 1431 } 1432 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1433 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1434 break; 1435 } 1436 /* Fall through and try READ CAPACITY(10) instead. */ 1437 case TYPE_ROM: 1438 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1439 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1440 rc10 = scsi_datain_unmarshall(task); 1441 if (rc10 == NULL) { 1442 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1443 } else { 1444 iscsilun->block_size = rc10->block_size; 1445 if (rc10->lba == 0) { 1446 /* blank disk loaded */ 1447 iscsilun->num_blocks = 0; 1448 } else { 1449 iscsilun->num_blocks = rc10->lba + 1; 1450 } 1451 } 1452 } 1453 break; 1454 default: 1455 return; 1456 } 1457 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1458 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1459 && retries-- > 0); 1460 1461 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1462 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1463 } else if (!iscsilun->block_size || 1464 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1465 error_setg(errp, "iSCSI: the target returned an invalid " 1466 "block size of %d.", iscsilun->block_size); 1467 } 1468 if (task) { 1469 scsi_free_scsi_task(task); 1470 } 1471 } 1472 1473 /* TODO Convert to fine grained options */ 1474 static QemuOptsList runtime_opts = { 1475 .name = "iscsi", 1476 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1477 .desc = { 1478 { 1479 .name = "filename", 1480 .type = QEMU_OPT_STRING, 1481 .help = "URL to the iscsi image", 1482 }, 1483 { /* end of list */ } 1484 }, 1485 }; 1486 1487 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1488 int evpd, int pc, void **inq, Error **errp) 1489 { 1490 int full_size; 1491 struct scsi_task *task = NULL; 1492 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1493 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1494 goto fail; 1495 } 1496 full_size = scsi_datain_getfullsize(task); 1497 if (full_size > task->datain.size) { 1498 scsi_free_scsi_task(task); 1499 1500 /* we need more data for the full list */ 1501 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1502 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1503 goto fail; 1504 } 1505 } 1506 1507 *inq = scsi_datain_unmarshall(task); 1508 if (*inq == NULL) { 1509 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1510 goto fail_with_err; 1511 } 1512 1513 return task; 1514 1515 fail: 1516 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1517 iscsi_get_error(iscsi)); 1518 fail_with_err: 1519 if (task != NULL) { 1520 scsi_free_scsi_task(task); 1521 } 1522 return NULL; 1523 } 1524 1525 static void iscsi_detach_aio_context(BlockDriverState *bs) 1526 { 1527 IscsiLun *iscsilun = bs->opaque; 1528 1529 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1530 false, NULL, NULL, NULL, NULL); 1531 iscsilun->events = 0; 1532 1533 if (iscsilun->nop_timer) { 1534 timer_del(iscsilun->nop_timer); 1535 timer_free(iscsilun->nop_timer); 1536 iscsilun->nop_timer = NULL; 1537 } 1538 if (iscsilun->event_timer) { 1539 timer_del(iscsilun->event_timer); 1540 timer_free(iscsilun->event_timer); 1541 iscsilun->event_timer = NULL; 1542 } 1543 } 1544 1545 static void iscsi_attach_aio_context(BlockDriverState *bs, 1546 AioContext *new_context) 1547 { 1548 IscsiLun *iscsilun = bs->opaque; 1549 1550 iscsilun->aio_context = new_context; 1551 iscsi_set_events(iscsilun); 1552 1553 /* Set up a timer for sending out iSCSI NOPs */ 1554 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1555 QEMU_CLOCK_REALTIME, SCALE_MS, 1556 iscsi_nop_timed_event, iscsilun); 1557 timer_mod(iscsilun->nop_timer, 1558 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1559 1560 /* Set up a timer for periodic calls to iscsi_set_events and to 1561 * scan for command timeout */ 1562 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1563 QEMU_CLOCK_REALTIME, SCALE_MS, 1564 iscsi_timed_check_events, iscsilun); 1565 timer_mod(iscsilun->event_timer, 1566 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1567 } 1568 1569 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1570 { 1571 struct scsi_task *task; 1572 struct scsi_mode_sense *ms = NULL; 1573 iscsilun->write_protected = false; 1574 iscsilun->dpofua = false; 1575 1576 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1577 1, SCSI_MODESENSE_PC_CURRENT, 1578 0x3F, 0, 255); 1579 if (task == NULL) { 1580 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1581 iscsi_get_error(iscsilun->iscsi)); 1582 goto out; 1583 } 1584 1585 if (task->status != SCSI_STATUS_GOOD) { 1586 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1587 goto out; 1588 } 1589 ms = scsi_datain_unmarshall(task); 1590 if (!ms) { 1591 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1592 iscsi_get_error(iscsilun->iscsi)); 1593 goto out; 1594 } 1595 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1596 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1597 1598 out: 1599 if (task) { 1600 scsi_free_scsi_task(task); 1601 } 1602 } 1603 1604 /* 1605 * We support iscsi url's on the form 1606 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1607 */ 1608 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1609 Error **errp) 1610 { 1611 IscsiLun *iscsilun = bs->opaque; 1612 struct iscsi_context *iscsi = NULL; 1613 struct iscsi_url *iscsi_url = NULL; 1614 struct scsi_task *task = NULL; 1615 struct scsi_inquiry_standard *inq = NULL; 1616 struct scsi_inquiry_supported_pages *inq_vpd; 1617 char *initiator_name = NULL; 1618 QemuOpts *opts; 1619 Error *local_err = NULL; 1620 const char *filename; 1621 int i, ret = 0, timeout = 0; 1622 1623 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1624 qemu_opts_absorb_qdict(opts, options, &local_err); 1625 if (local_err) { 1626 error_propagate(errp, local_err); 1627 ret = -EINVAL; 1628 goto out; 1629 } 1630 1631 filename = qemu_opt_get(opts, "filename"); 1632 1633 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1634 if (iscsi_url == NULL) { 1635 error_setg(errp, "Failed to parse URL : %s", filename); 1636 ret = -EINVAL; 1637 goto out; 1638 } 1639 1640 memset(iscsilun, 0, sizeof(IscsiLun)); 1641 1642 initiator_name = parse_initiator_name(iscsi_url->target); 1643 1644 iscsi = iscsi_create_context(initiator_name); 1645 if (iscsi == NULL) { 1646 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1647 ret = -ENOMEM; 1648 goto out; 1649 } 1650 #if LIBISCSI_API_VERSION >= (20160603) 1651 if (iscsi_init_transport(iscsi, iscsi_url->transport)) { 1652 error_setg(errp, ("Error initializing transport.")); 1653 ret = -EINVAL; 1654 goto out; 1655 } 1656 #endif 1657 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1658 error_setg(errp, "iSCSI: Failed to set target name."); 1659 ret = -EINVAL; 1660 goto out; 1661 } 1662 1663 if (iscsi_url->user[0] != '\0') { 1664 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1665 iscsi_url->passwd); 1666 if (ret != 0) { 1667 error_setg(errp, "Failed to set initiator username and password"); 1668 ret = -EINVAL; 1669 goto out; 1670 } 1671 } 1672 1673 /* check if we got CHAP username/password via the options */ 1674 parse_chap(iscsi, iscsi_url->target, &local_err); 1675 if (local_err != NULL) { 1676 error_propagate(errp, local_err); 1677 ret = -EINVAL; 1678 goto out; 1679 } 1680 1681 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1682 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1683 ret = -EINVAL; 1684 goto out; 1685 } 1686 1687 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1688 1689 /* check if we got HEADER_DIGEST via the options */ 1690 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1691 if (local_err != NULL) { 1692 error_propagate(errp, local_err); 1693 ret = -EINVAL; 1694 goto out; 1695 } 1696 1697 /* timeout handling is broken in libiscsi before 1.15.0 */ 1698 timeout = parse_timeout(iscsi_url->target); 1699 #if LIBISCSI_API_VERSION >= 20150621 1700 iscsi_set_timeout(iscsi, timeout); 1701 #else 1702 if (timeout) { 1703 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1704 } 1705 #endif 1706 1707 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1708 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1709 iscsi_get_error(iscsi)); 1710 ret = -EINVAL; 1711 goto out; 1712 } 1713 1714 iscsilun->iscsi = iscsi; 1715 iscsilun->aio_context = bdrv_get_aio_context(bs); 1716 iscsilun->lun = iscsi_url->lun; 1717 iscsilun->has_write_same = true; 1718 1719 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1720 (void **) &inq, errp); 1721 if (task == NULL) { 1722 ret = -EINVAL; 1723 goto out; 1724 } 1725 iscsilun->type = inq->periperal_device_type; 1726 scsi_free_scsi_task(task); 1727 task = NULL; 1728 1729 iscsi_modesense_sync(iscsilun); 1730 if (iscsilun->dpofua) { 1731 bs->supported_write_flags = BDRV_REQ_FUA; 1732 } 1733 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1734 1735 /* Check the write protect flag of the LUN if we want to write */ 1736 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1737 iscsilun->write_protected) { 1738 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1739 ret = -EACCES; 1740 goto out; 1741 } 1742 1743 iscsi_readcapacity_sync(iscsilun, &local_err); 1744 if (local_err != NULL) { 1745 error_propagate(errp, local_err); 1746 ret = -EINVAL; 1747 goto out; 1748 } 1749 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1750 1751 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1752 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1753 * will try to read from the device to guess the image format. 1754 */ 1755 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1756 bs->sg = true; 1757 } 1758 1759 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1760 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1761 (void **) &inq_vpd, errp); 1762 if (task == NULL) { 1763 ret = -EINVAL; 1764 goto out; 1765 } 1766 for (i = 0; i < inq_vpd->num_pages; i++) { 1767 struct scsi_task *inq_task; 1768 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1769 struct scsi_inquiry_block_limits *inq_bl; 1770 switch (inq_vpd->pages[i]) { 1771 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1772 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1773 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1774 (void **) &inq_lbp, errp); 1775 if (inq_task == NULL) { 1776 ret = -EINVAL; 1777 goto out; 1778 } 1779 memcpy(&iscsilun->lbp, inq_lbp, 1780 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1781 scsi_free_scsi_task(inq_task); 1782 break; 1783 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1784 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1785 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1786 (void **) &inq_bl, errp); 1787 if (inq_task == NULL) { 1788 ret = -EINVAL; 1789 goto out; 1790 } 1791 memcpy(&iscsilun->bl, inq_bl, 1792 sizeof(struct scsi_inquiry_block_limits)); 1793 scsi_free_scsi_task(inq_task); 1794 break; 1795 default: 1796 break; 1797 } 1798 } 1799 scsi_free_scsi_task(task); 1800 task = NULL; 1801 1802 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1803 1804 /* Guess the internal cluster (page) size of the iscsi target by the means 1805 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1806 * reasonable size */ 1807 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1808 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1809 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1810 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1811 if (iscsilun->lbprz) { 1812 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1813 } 1814 } 1815 1816 out: 1817 qemu_opts_del(opts); 1818 g_free(initiator_name); 1819 if (iscsi_url != NULL) { 1820 iscsi_destroy_url(iscsi_url); 1821 } 1822 if (task != NULL) { 1823 scsi_free_scsi_task(task); 1824 } 1825 1826 if (ret) { 1827 if (iscsi != NULL) { 1828 if (iscsi_is_logged_in(iscsi)) { 1829 iscsi_logout_sync(iscsi); 1830 } 1831 iscsi_destroy_context(iscsi); 1832 } 1833 memset(iscsilun, 0, sizeof(IscsiLun)); 1834 } 1835 return ret; 1836 } 1837 1838 static void iscsi_close(BlockDriverState *bs) 1839 { 1840 IscsiLun *iscsilun = bs->opaque; 1841 struct iscsi_context *iscsi = iscsilun->iscsi; 1842 1843 iscsi_detach_aio_context(bs); 1844 if (iscsi_is_logged_in(iscsi)) { 1845 iscsi_logout_sync(iscsi); 1846 } 1847 iscsi_destroy_context(iscsi); 1848 g_free(iscsilun->zeroblock); 1849 iscsi_allocmap_free(iscsilun); 1850 memset(iscsilun, 0, sizeof(IscsiLun)); 1851 } 1852 1853 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1854 { 1855 /* We don't actually refresh here, but just return data queried in 1856 * iscsi_open(): iscsi targets don't change their limits. */ 1857 1858 IscsiLun *iscsilun = bs->opaque; 1859 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 1860 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 1861 1862 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 1863 1864 bs->bl.request_alignment = block_size; 1865 1866 if (iscsilun->bl.max_xfer_len) { 1867 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 1868 } 1869 1870 if (max_xfer_len * block_size < INT_MAX) { 1871 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 1872 } 1873 1874 if (iscsilun->lbp.lbpu) { 1875 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 1876 bs->bl.max_pdiscard = 1877 iscsilun->bl.max_unmap * iscsilun->block_size; 1878 } 1879 bs->bl.pdiscard_alignment = 1880 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1881 } else { 1882 bs->bl.pdiscard_alignment = iscsilun->block_size; 1883 } 1884 1885 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 1886 bs->bl.max_pwrite_zeroes = 1887 iscsilun->bl.max_ws_len * iscsilun->block_size; 1888 } 1889 if (iscsilun->lbp.lbpws) { 1890 bs->bl.pwrite_zeroes_alignment = 1891 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1892 } else { 1893 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 1894 } 1895 if (iscsilun->bl.opt_xfer_len && 1896 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 1897 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 1898 iscsilun->block_size); 1899 } 1900 } 1901 1902 /* Note that this will not re-establish a connection with an iSCSI target - it 1903 * is effectively a NOP. */ 1904 static int iscsi_reopen_prepare(BDRVReopenState *state, 1905 BlockReopenQueue *queue, Error **errp) 1906 { 1907 IscsiLun *iscsilun = state->bs->opaque; 1908 1909 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 1910 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1911 return -EACCES; 1912 } 1913 return 0; 1914 } 1915 1916 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 1917 { 1918 IscsiLun *iscsilun = reopen_state->bs->opaque; 1919 1920 /* the cache.direct status might have changed */ 1921 if (iscsilun->allocmap != NULL) { 1922 iscsi_allocmap_init(iscsilun, reopen_state->flags); 1923 } 1924 } 1925 1926 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1927 { 1928 IscsiLun *iscsilun = bs->opaque; 1929 Error *local_err = NULL; 1930 1931 if (iscsilun->type != TYPE_DISK) { 1932 return -ENOTSUP; 1933 } 1934 1935 iscsi_readcapacity_sync(iscsilun, &local_err); 1936 if (local_err != NULL) { 1937 error_free(local_err); 1938 return -EIO; 1939 } 1940 1941 if (offset > iscsi_getlength(bs)) { 1942 return -EINVAL; 1943 } 1944 1945 if (iscsilun->allocmap != NULL) { 1946 iscsi_allocmap_init(iscsilun, bs->open_flags); 1947 } 1948 1949 return 0; 1950 } 1951 1952 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) 1953 { 1954 int ret = 0; 1955 int64_t total_size = 0; 1956 BlockDriverState *bs; 1957 IscsiLun *iscsilun = NULL; 1958 QDict *bs_options; 1959 1960 bs = bdrv_new(); 1961 1962 /* Read out options */ 1963 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1964 BDRV_SECTOR_SIZE); 1965 bs->opaque = g_new0(struct IscsiLun, 1); 1966 iscsilun = bs->opaque; 1967 1968 bs_options = qdict_new(); 1969 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1970 ret = iscsi_open(bs, bs_options, 0, NULL); 1971 QDECREF(bs_options); 1972 1973 if (ret != 0) { 1974 goto out; 1975 } 1976 iscsi_detach_aio_context(bs); 1977 if (iscsilun->type != TYPE_DISK) { 1978 ret = -ENODEV; 1979 goto out; 1980 } 1981 if (bs->total_sectors < total_size) { 1982 ret = -ENOSPC; 1983 goto out; 1984 } 1985 1986 ret = 0; 1987 out: 1988 if (iscsilun->iscsi != NULL) { 1989 iscsi_destroy_context(iscsilun->iscsi); 1990 } 1991 g_free(bs->opaque); 1992 bs->opaque = NULL; 1993 bdrv_unref(bs); 1994 return ret; 1995 } 1996 1997 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1998 { 1999 IscsiLun *iscsilun = bs->opaque; 2000 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2001 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 2002 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 2003 return 0; 2004 } 2005 2006 static void iscsi_invalidate_cache(BlockDriverState *bs, 2007 Error **errp) 2008 { 2009 IscsiLun *iscsilun = bs->opaque; 2010 iscsi_allocmap_invalidate(iscsilun); 2011 } 2012 2013 static QemuOptsList iscsi_create_opts = { 2014 .name = "iscsi-create-opts", 2015 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2016 .desc = { 2017 { 2018 .name = BLOCK_OPT_SIZE, 2019 .type = QEMU_OPT_SIZE, 2020 .help = "Virtual disk size" 2021 }, 2022 { /* end of list */ } 2023 } 2024 }; 2025 2026 static BlockDriver bdrv_iscsi = { 2027 .format_name = "iscsi", 2028 .protocol_name = "iscsi", 2029 2030 .instance_size = sizeof(IscsiLun), 2031 .bdrv_needs_filename = true, 2032 .bdrv_file_open = iscsi_open, 2033 .bdrv_close = iscsi_close, 2034 .bdrv_create = iscsi_create, 2035 .create_opts = &iscsi_create_opts, 2036 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2037 .bdrv_reopen_commit = iscsi_reopen_commit, 2038 .bdrv_invalidate_cache = iscsi_invalidate_cache, 2039 2040 .bdrv_getlength = iscsi_getlength, 2041 .bdrv_get_info = iscsi_get_info, 2042 .bdrv_truncate = iscsi_truncate, 2043 .bdrv_refresh_limits = iscsi_refresh_limits, 2044 2045 .bdrv_co_get_block_status = iscsi_co_get_block_status, 2046 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2047 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2048 .bdrv_co_readv = iscsi_co_readv, 2049 .bdrv_co_writev_flags = iscsi_co_writev_flags, 2050 .bdrv_co_flush_to_disk = iscsi_co_flush, 2051 2052 #ifdef __linux__ 2053 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2054 #endif 2055 2056 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2057 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2058 }; 2059 2060 #if LIBISCSI_API_VERSION >= (20160603) 2061 static BlockDriver bdrv_iser = { 2062 .format_name = "iser", 2063 .protocol_name = "iser", 2064 2065 .instance_size = sizeof(IscsiLun), 2066 .bdrv_needs_filename = true, 2067 .bdrv_file_open = iscsi_open, 2068 .bdrv_close = iscsi_close, 2069 .bdrv_create = iscsi_create, 2070 .create_opts = &iscsi_create_opts, 2071 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2072 .bdrv_reopen_commit = iscsi_reopen_commit, 2073 .bdrv_invalidate_cache = iscsi_invalidate_cache, 2074 2075 .bdrv_getlength = iscsi_getlength, 2076 .bdrv_get_info = iscsi_get_info, 2077 .bdrv_truncate = iscsi_truncate, 2078 .bdrv_refresh_limits = iscsi_refresh_limits, 2079 2080 .bdrv_co_get_block_status = iscsi_co_get_block_status, 2081 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2082 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2083 .bdrv_co_readv = iscsi_co_readv, 2084 .bdrv_co_writev_flags = iscsi_co_writev_flags, 2085 .bdrv_co_flush_to_disk = iscsi_co_flush, 2086 2087 #ifdef __linux__ 2088 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2089 #endif 2090 2091 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2092 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2093 }; 2094 #endif 2095 2096 static void iscsi_block_init(void) 2097 { 2098 bdrv_register(&bdrv_iscsi); 2099 #if LIBISCSI_API_VERSION >= (20160603) 2100 bdrv_register(&bdrv_iser); 2101 #endif 2102 } 2103 2104 block_init(iscsi_block_init); 2105