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 if (nb_cls_shrunk > 0) { 503 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 504 } 505 } 506 507 if (iscsilun->allocmap_valid == NULL) { 508 return; 509 } 510 if (valid) { 511 if (nb_cls_shrunk > 0) { 512 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 513 } 514 } else { 515 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 516 nb_cls_expanded); 517 } 518 } 519 520 static void 521 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num, 522 int nb_sectors) 523 { 524 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true); 525 } 526 527 static void 528 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num, 529 int nb_sectors) 530 { 531 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 532 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 533 */ 534 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true); 535 } 536 537 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num, 538 int nb_sectors) 539 { 540 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false); 541 } 542 543 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 544 { 545 if (iscsilun->allocmap) { 546 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 547 } 548 if (iscsilun->allocmap_valid) { 549 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 550 } 551 } 552 553 static inline bool 554 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num, 555 int nb_sectors) 556 { 557 unsigned long size; 558 if (iscsilun->allocmap == NULL) { 559 return true; 560 } 561 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 562 return !(find_next_bit(iscsilun->allocmap, size, 563 sector_num / iscsilun->cluster_sectors) == size); 564 } 565 566 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 567 int64_t sector_num, int nb_sectors) 568 { 569 unsigned long size; 570 if (iscsilun->allocmap_valid == NULL) { 571 return false; 572 } 573 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 574 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 575 sector_num / iscsilun->cluster_sectors) == size); 576 } 577 578 static int coroutine_fn 579 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 580 QEMUIOVector *iov, int flags) 581 { 582 IscsiLun *iscsilun = bs->opaque; 583 struct IscsiTask iTask; 584 uint64_t lba; 585 uint32_t num_sectors; 586 bool fua = flags & BDRV_REQ_FUA; 587 588 if (fua) { 589 assert(iscsilun->dpofua); 590 } 591 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 592 return -EINVAL; 593 } 594 595 if (bs->bl.max_transfer) { 596 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 597 } 598 599 lba = sector_qemu2lun(sector_num, iscsilun); 600 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 601 iscsi_co_init_iscsitask(iscsilun, &iTask); 602 retry: 603 if (iscsilun->use_16_for_rw) { 604 #if LIBISCSI_API_VERSION >= (20160603) 605 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 606 NULL, num_sectors * iscsilun->block_size, 607 iscsilun->block_size, 0, 0, fua, 0, 0, 608 iscsi_co_generic_cb, &iTask, 609 (struct scsi_iovec *)iov->iov, iov->niov); 610 } else { 611 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 612 NULL, num_sectors * iscsilun->block_size, 613 iscsilun->block_size, 0, 0, fua, 0, 0, 614 iscsi_co_generic_cb, &iTask, 615 (struct scsi_iovec *)iov->iov, iov->niov); 616 } 617 #else 618 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 619 NULL, num_sectors * iscsilun->block_size, 620 iscsilun->block_size, 0, 0, fua, 0, 0, 621 iscsi_co_generic_cb, &iTask); 622 } else { 623 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 624 NULL, num_sectors * iscsilun->block_size, 625 iscsilun->block_size, 0, 0, fua, 0, 0, 626 iscsi_co_generic_cb, &iTask); 627 } 628 #endif 629 if (iTask.task == NULL) { 630 return -ENOMEM; 631 } 632 #if LIBISCSI_API_VERSION < (20160603) 633 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 634 iov->niov); 635 #endif 636 while (!iTask.complete) { 637 iscsi_set_events(iscsilun); 638 qemu_coroutine_yield(); 639 } 640 641 if (iTask.task != NULL) { 642 scsi_free_scsi_task(iTask.task); 643 iTask.task = NULL; 644 } 645 646 if (iTask.do_retry) { 647 iTask.complete = 0; 648 goto retry; 649 } 650 651 if (iTask.status != SCSI_STATUS_GOOD) { 652 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors); 653 return iTask.err_code; 654 } 655 656 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors); 657 658 return 0; 659 } 660 661 662 663 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 664 int64_t sector_num, 665 int nb_sectors, int *pnum, 666 BlockDriverState **file) 667 { 668 IscsiLun *iscsilun = bs->opaque; 669 struct scsi_get_lba_status *lbas = NULL; 670 struct scsi_lba_status_descriptor *lbasd = NULL; 671 struct IscsiTask iTask; 672 int64_t ret; 673 674 iscsi_co_init_iscsitask(iscsilun, &iTask); 675 676 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 677 ret = -EINVAL; 678 goto out; 679 } 680 681 /* default to all sectors allocated */ 682 ret = BDRV_BLOCK_DATA; 683 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 684 *pnum = nb_sectors; 685 686 /* LUN does not support logical block provisioning */ 687 if (!iscsilun->lbpme) { 688 goto out; 689 } 690 691 retry: 692 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 693 sector_qemu2lun(sector_num, iscsilun), 694 8 + 16, iscsi_co_generic_cb, 695 &iTask) == NULL) { 696 ret = -ENOMEM; 697 goto out; 698 } 699 700 while (!iTask.complete) { 701 iscsi_set_events(iscsilun); 702 qemu_coroutine_yield(); 703 } 704 705 if (iTask.do_retry) { 706 if (iTask.task != NULL) { 707 scsi_free_scsi_task(iTask.task); 708 iTask.task = NULL; 709 } 710 iTask.complete = 0; 711 goto retry; 712 } 713 714 if (iTask.status != SCSI_STATUS_GOOD) { 715 /* in case the get_lba_status_callout fails (i.e. 716 * because the device is busy or the cmd is not 717 * supported) we pretend all blocks are allocated 718 * for backwards compatibility */ 719 goto out; 720 } 721 722 lbas = scsi_datain_unmarshall(iTask.task); 723 if (lbas == NULL) { 724 ret = -EIO; 725 goto out; 726 } 727 728 lbasd = &lbas->descriptors[0]; 729 730 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 731 ret = -EIO; 732 goto out; 733 } 734 735 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 736 737 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 738 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 739 ret &= ~BDRV_BLOCK_DATA; 740 if (iscsilun->lbprz) { 741 ret |= BDRV_BLOCK_ZERO; 742 } 743 } 744 745 if (ret & BDRV_BLOCK_ZERO) { 746 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum); 747 } else { 748 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum); 749 } 750 751 if (*pnum > nb_sectors) { 752 *pnum = nb_sectors; 753 } 754 out: 755 if (iTask.task != NULL) { 756 scsi_free_scsi_task(iTask.task); 757 } 758 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) { 759 *file = bs; 760 } 761 return ret; 762 } 763 764 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 765 int64_t sector_num, int nb_sectors, 766 QEMUIOVector *iov) 767 { 768 IscsiLun *iscsilun = bs->opaque; 769 struct IscsiTask iTask; 770 uint64_t lba; 771 uint32_t num_sectors; 772 773 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 774 return -EINVAL; 775 } 776 777 if (bs->bl.max_transfer) { 778 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 779 } 780 781 /* if cache.direct is off and we have a valid entry in our allocation map 782 * we can skip checking the block status and directly return zeroes if 783 * the request falls within an unallocated area */ 784 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 785 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 786 qemu_iovec_memset(iov, 0, 0x00, iov->size); 787 return 0; 788 } 789 790 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 791 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 792 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 793 int pnum; 794 BlockDriverState *file; 795 /* check the block status from the beginning of the cluster 796 * containing the start sector */ 797 int64_t ret = iscsi_co_get_block_status(bs, 798 sector_num - sector_num % iscsilun->cluster_sectors, 799 BDRV_REQUEST_MAX_SECTORS, &pnum, &file); 800 if (ret < 0) { 801 return ret; 802 } 803 /* if the whole request falls into an unallocated area we can avoid 804 * to read and directly return zeroes instead */ 805 if (ret & BDRV_BLOCK_ZERO && 806 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) { 807 qemu_iovec_memset(iov, 0, 0x00, iov->size); 808 return 0; 809 } 810 } 811 812 lba = sector_qemu2lun(sector_num, iscsilun); 813 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 814 815 iscsi_co_init_iscsitask(iscsilun, &iTask); 816 retry: 817 if (iscsilun->use_16_for_rw) { 818 #if LIBISCSI_API_VERSION >= (20160603) 819 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 820 num_sectors * iscsilun->block_size, 821 iscsilun->block_size, 0, 0, 0, 0, 0, 822 iscsi_co_generic_cb, &iTask, 823 (struct scsi_iovec *)iov->iov, iov->niov); 824 } else { 825 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 826 num_sectors * iscsilun->block_size, 827 iscsilun->block_size, 828 0, 0, 0, 0, 0, 829 iscsi_co_generic_cb, &iTask, 830 (struct scsi_iovec *)iov->iov, iov->niov); 831 } 832 #else 833 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 834 num_sectors * iscsilun->block_size, 835 iscsilun->block_size, 0, 0, 0, 0, 0, 836 iscsi_co_generic_cb, &iTask); 837 } else { 838 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 839 num_sectors * iscsilun->block_size, 840 iscsilun->block_size, 841 0, 0, 0, 0, 0, 842 iscsi_co_generic_cb, &iTask); 843 } 844 #endif 845 if (iTask.task == NULL) { 846 return -ENOMEM; 847 } 848 #if LIBISCSI_API_VERSION < (20160603) 849 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 850 #endif 851 while (!iTask.complete) { 852 iscsi_set_events(iscsilun); 853 qemu_coroutine_yield(); 854 } 855 856 if (iTask.task != NULL) { 857 scsi_free_scsi_task(iTask.task); 858 iTask.task = NULL; 859 } 860 861 if (iTask.do_retry) { 862 iTask.complete = 0; 863 goto retry; 864 } 865 866 if (iTask.status != SCSI_STATUS_GOOD) { 867 return iTask.err_code; 868 } 869 870 return 0; 871 } 872 873 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 874 { 875 IscsiLun *iscsilun = bs->opaque; 876 struct IscsiTask iTask; 877 878 iscsi_co_init_iscsitask(iscsilun, &iTask); 879 retry: 880 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 881 0, iscsi_co_generic_cb, &iTask) == NULL) { 882 return -ENOMEM; 883 } 884 885 while (!iTask.complete) { 886 iscsi_set_events(iscsilun); 887 qemu_coroutine_yield(); 888 } 889 890 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 return iTask.err_code; 902 } 903 904 return 0; 905 } 906 907 #ifdef __linux__ 908 static void 909 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 910 void *command_data, void *opaque) 911 { 912 IscsiAIOCB *acb = opaque; 913 914 g_free(acb->buf); 915 acb->buf = NULL; 916 917 acb->status = 0; 918 if (status < 0) { 919 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 920 iscsi_get_error(iscsi)); 921 acb->status = iscsi_translate_sense(&acb->task->sense); 922 } 923 924 acb->ioh->driver_status = 0; 925 acb->ioh->host_status = 0; 926 acb->ioh->resid = 0; 927 acb->ioh->status = status; 928 929 #define SG_ERR_DRIVER_SENSE 0x08 930 931 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 932 int ss; 933 934 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 935 936 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 937 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 938 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 939 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 940 } 941 942 iscsi_schedule_bh(acb); 943 } 944 945 static void iscsi_ioctl_bh_completion(void *opaque) 946 { 947 IscsiAIOCB *acb = opaque; 948 949 qemu_bh_delete(acb->bh); 950 acb->common.cb(acb->common.opaque, acb->ret); 951 qemu_aio_unref(acb); 952 } 953 954 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 955 { 956 BlockDriverState *bs = acb->common.bs; 957 IscsiLun *iscsilun = bs->opaque; 958 int ret = 0; 959 960 switch (req) { 961 case SG_GET_VERSION_NUM: 962 *(int *)buf = 30000; 963 break; 964 case SG_GET_SCSI_ID: 965 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 966 break; 967 default: 968 ret = -EINVAL; 969 } 970 assert(!acb->bh); 971 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 972 iscsi_ioctl_bh_completion, acb); 973 acb->ret = ret; 974 qemu_bh_schedule(acb->bh); 975 } 976 977 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 978 unsigned long int req, void *buf, 979 BlockCompletionFunc *cb, void *opaque) 980 { 981 IscsiLun *iscsilun = bs->opaque; 982 struct iscsi_context *iscsi = iscsilun->iscsi; 983 struct iscsi_data data; 984 IscsiAIOCB *acb; 985 986 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 987 988 acb->iscsilun = iscsilun; 989 acb->bh = NULL; 990 acb->status = -EINPROGRESS; 991 acb->buf = NULL; 992 acb->ioh = buf; 993 994 if (req != SG_IO) { 995 iscsi_ioctl_handle_emulated(acb, req, buf); 996 return &acb->common; 997 } 998 999 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 1000 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 1001 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 1002 qemu_aio_unref(acb); 1003 return NULL; 1004 } 1005 1006 acb->task = malloc(sizeof(struct scsi_task)); 1007 if (acb->task == NULL) { 1008 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1009 iscsi_get_error(iscsi)); 1010 qemu_aio_unref(acb); 1011 return NULL; 1012 } 1013 memset(acb->task, 0, sizeof(struct scsi_task)); 1014 1015 switch (acb->ioh->dxfer_direction) { 1016 case SG_DXFER_TO_DEV: 1017 acb->task->xfer_dir = SCSI_XFER_WRITE; 1018 break; 1019 case SG_DXFER_FROM_DEV: 1020 acb->task->xfer_dir = SCSI_XFER_READ; 1021 break; 1022 default: 1023 acb->task->xfer_dir = SCSI_XFER_NONE; 1024 break; 1025 } 1026 1027 acb->task->cdb_size = acb->ioh->cmd_len; 1028 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1029 acb->task->expxferlen = acb->ioh->dxfer_len; 1030 1031 data.size = 0; 1032 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1033 if (acb->ioh->iovec_count == 0) { 1034 data.data = acb->ioh->dxferp; 1035 data.size = acb->ioh->dxfer_len; 1036 } else { 1037 scsi_task_set_iov_out(acb->task, 1038 (struct scsi_iovec *) acb->ioh->dxferp, 1039 acb->ioh->iovec_count); 1040 } 1041 } 1042 1043 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1044 iscsi_aio_ioctl_cb, 1045 (data.size > 0) ? &data : NULL, 1046 acb) != 0) { 1047 scsi_free_scsi_task(acb->task); 1048 qemu_aio_unref(acb); 1049 return NULL; 1050 } 1051 1052 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1053 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1054 if (acb->ioh->iovec_count == 0) { 1055 scsi_task_add_data_in_buffer(acb->task, 1056 acb->ioh->dxfer_len, 1057 acb->ioh->dxferp); 1058 } else { 1059 scsi_task_set_iov_in(acb->task, 1060 (struct scsi_iovec *) acb->ioh->dxferp, 1061 acb->ioh->iovec_count); 1062 } 1063 } 1064 1065 iscsi_set_events(iscsilun); 1066 1067 return &acb->common; 1068 } 1069 1070 #endif 1071 1072 static int64_t 1073 iscsi_getlength(BlockDriverState *bs) 1074 { 1075 IscsiLun *iscsilun = bs->opaque; 1076 int64_t len; 1077 1078 len = iscsilun->num_blocks; 1079 len *= iscsilun->block_size; 1080 1081 return len; 1082 } 1083 1084 static int 1085 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int count) 1086 { 1087 IscsiLun *iscsilun = bs->opaque; 1088 struct IscsiTask iTask; 1089 struct unmap_list list; 1090 1091 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) { 1092 return -ENOTSUP; 1093 } 1094 1095 if (!iscsilun->lbp.lbpu) { 1096 /* UNMAP is not supported by the target */ 1097 return 0; 1098 } 1099 1100 list.lba = offset / iscsilun->block_size; 1101 list.num = count / iscsilun->block_size; 1102 1103 iscsi_co_init_iscsitask(iscsilun, &iTask); 1104 retry: 1105 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1106 iscsi_co_generic_cb, &iTask) == NULL) { 1107 return -ENOMEM; 1108 } 1109 1110 while (!iTask.complete) { 1111 iscsi_set_events(iscsilun); 1112 qemu_coroutine_yield(); 1113 } 1114 1115 if (iTask.task != NULL) { 1116 scsi_free_scsi_task(iTask.task); 1117 iTask.task = NULL; 1118 } 1119 1120 if (iTask.do_retry) { 1121 iTask.complete = 0; 1122 goto retry; 1123 } 1124 1125 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1126 /* the target might fail with a check condition if it 1127 is not happy with the alignment of the UNMAP request 1128 we silently fail in this case */ 1129 return 0; 1130 } 1131 1132 if (iTask.status != SCSI_STATUS_GOOD) { 1133 return iTask.err_code; 1134 } 1135 1136 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1137 count >> BDRV_SECTOR_BITS); 1138 1139 return 0; 1140 } 1141 1142 static int 1143 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1144 int count, BdrvRequestFlags flags) 1145 { 1146 IscsiLun *iscsilun = bs->opaque; 1147 struct IscsiTask iTask; 1148 uint64_t lba; 1149 uint32_t nb_blocks; 1150 bool use_16_for_ws = iscsilun->use_16_for_rw; 1151 1152 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) { 1153 return -ENOTSUP; 1154 } 1155 1156 if (flags & BDRV_REQ_MAY_UNMAP) { 1157 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1158 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1159 use_16_for_ws = true; 1160 } 1161 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1162 /* WRITESAME16 with UNMAP is not supported by the target, 1163 * fall back and try WRITESAME10/16 without UNMAP */ 1164 flags &= ~BDRV_REQ_MAY_UNMAP; 1165 use_16_for_ws = iscsilun->use_16_for_rw; 1166 } 1167 } 1168 1169 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1170 /* WRITESAME without UNMAP is not supported by the target */ 1171 return -ENOTSUP; 1172 } 1173 1174 lba = offset / iscsilun->block_size; 1175 nb_blocks = count / iscsilun->block_size; 1176 1177 if (iscsilun->zeroblock == NULL) { 1178 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1179 if (iscsilun->zeroblock == NULL) { 1180 return -ENOMEM; 1181 } 1182 } 1183 1184 iscsi_co_init_iscsitask(iscsilun, &iTask); 1185 retry: 1186 if (use_16_for_ws) { 1187 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1188 iscsilun->zeroblock, iscsilun->block_size, 1189 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1190 0, 0, iscsi_co_generic_cb, &iTask); 1191 } else { 1192 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1193 iscsilun->zeroblock, iscsilun->block_size, 1194 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1195 0, 0, iscsi_co_generic_cb, &iTask); 1196 } 1197 if (iTask.task == NULL) { 1198 return -ENOMEM; 1199 } 1200 1201 while (!iTask.complete) { 1202 iscsi_set_events(iscsilun); 1203 qemu_coroutine_yield(); 1204 } 1205 1206 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1207 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1208 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1209 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1210 /* WRITE SAME is not supported by the target */ 1211 iscsilun->has_write_same = false; 1212 scsi_free_scsi_task(iTask.task); 1213 return -ENOTSUP; 1214 } 1215 1216 if (iTask.task != NULL) { 1217 scsi_free_scsi_task(iTask.task); 1218 iTask.task = NULL; 1219 } 1220 1221 if (iTask.do_retry) { 1222 iTask.complete = 0; 1223 goto retry; 1224 } 1225 1226 if (iTask.status != SCSI_STATUS_GOOD) { 1227 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1228 count >> BDRV_SECTOR_BITS); 1229 return iTask.err_code; 1230 } 1231 1232 if (flags & BDRV_REQ_MAY_UNMAP) { 1233 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1234 count >> BDRV_SECTOR_BITS); 1235 } else { 1236 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS, 1237 count >> BDRV_SECTOR_BITS); 1238 } 1239 1240 return 0; 1241 } 1242 1243 static void parse_chap(struct iscsi_context *iscsi, const char *target, 1244 Error **errp) 1245 { 1246 QemuOptsList *list; 1247 QemuOpts *opts; 1248 const char *user = NULL; 1249 const char *password = NULL; 1250 const char *secretid; 1251 char *secret = NULL; 1252 1253 list = qemu_find_opts("iscsi"); 1254 if (!list) { 1255 return; 1256 } 1257 1258 opts = qemu_opts_find(list, target); 1259 if (opts == NULL) { 1260 opts = QTAILQ_FIRST(&list->head); 1261 if (!opts) { 1262 return; 1263 } 1264 } 1265 1266 user = qemu_opt_get(opts, "user"); 1267 if (!user) { 1268 return; 1269 } 1270 1271 secretid = qemu_opt_get(opts, "password-secret"); 1272 password = qemu_opt_get(opts, "password"); 1273 if (secretid && password) { 1274 error_setg(errp, "'password' and 'password-secret' properties are " 1275 "mutually exclusive"); 1276 return; 1277 } 1278 if (secretid) { 1279 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1280 if (!secret) { 1281 return; 1282 } 1283 password = secret; 1284 } else if (!password) { 1285 error_setg(errp, "CHAP username specified but no password was given"); 1286 return; 1287 } 1288 1289 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1290 error_setg(errp, "Failed to set initiator username and password"); 1291 } 1292 1293 g_free(secret); 1294 } 1295 1296 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 1297 Error **errp) 1298 { 1299 QemuOptsList *list; 1300 QemuOpts *opts; 1301 const char *digest = NULL; 1302 1303 list = qemu_find_opts("iscsi"); 1304 if (!list) { 1305 return; 1306 } 1307 1308 opts = qemu_opts_find(list, target); 1309 if (opts == NULL) { 1310 opts = QTAILQ_FIRST(&list->head); 1311 if (!opts) { 1312 return; 1313 } 1314 } 1315 1316 digest = qemu_opt_get(opts, "header-digest"); 1317 if (!digest) { 1318 return; 1319 } 1320 1321 if (!strcmp(digest, "CRC32C")) { 1322 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1323 } else if (!strcmp(digest, "NONE")) { 1324 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1325 } else if (!strcmp(digest, "CRC32C-NONE")) { 1326 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1327 } else if (!strcmp(digest, "NONE-CRC32C")) { 1328 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1329 } else { 1330 error_setg(errp, "Invalid header-digest setting : %s", digest); 1331 } 1332 } 1333 1334 static char *parse_initiator_name(const char *target) 1335 { 1336 QemuOptsList *list; 1337 QemuOpts *opts; 1338 const char *name; 1339 char *iscsi_name; 1340 UuidInfo *uuid_info; 1341 1342 list = qemu_find_opts("iscsi"); 1343 if (list) { 1344 opts = qemu_opts_find(list, target); 1345 if (!opts) { 1346 opts = QTAILQ_FIRST(&list->head); 1347 } 1348 if (opts) { 1349 name = qemu_opt_get(opts, "initiator-name"); 1350 if (name) { 1351 return g_strdup(name); 1352 } 1353 } 1354 } 1355 1356 uuid_info = qmp_query_uuid(NULL); 1357 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1358 name = qemu_get_vm_name(); 1359 } else { 1360 name = uuid_info->UUID; 1361 } 1362 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1363 name ? ":" : "", name ? name : ""); 1364 qapi_free_UuidInfo(uuid_info); 1365 return iscsi_name; 1366 } 1367 1368 static int parse_timeout(const char *target) 1369 { 1370 QemuOptsList *list; 1371 QemuOpts *opts; 1372 const char *timeout; 1373 1374 list = qemu_find_opts("iscsi"); 1375 if (list) { 1376 opts = qemu_opts_find(list, target); 1377 if (!opts) { 1378 opts = QTAILQ_FIRST(&list->head); 1379 } 1380 if (opts) { 1381 timeout = qemu_opt_get(opts, "timeout"); 1382 if (timeout) { 1383 return atoi(timeout); 1384 } 1385 } 1386 } 1387 1388 return 0; 1389 } 1390 1391 static void iscsi_nop_timed_event(void *opaque) 1392 { 1393 IscsiLun *iscsilun = opaque; 1394 1395 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1396 error_report("iSCSI: NOP timeout. Reconnecting..."); 1397 iscsilun->request_timed_out = true; 1398 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1399 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1400 return; 1401 } 1402 1403 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1404 iscsi_set_events(iscsilun); 1405 } 1406 1407 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1408 { 1409 struct scsi_task *task = NULL; 1410 struct scsi_readcapacity10 *rc10 = NULL; 1411 struct scsi_readcapacity16 *rc16 = NULL; 1412 int retries = ISCSI_CMD_RETRIES; 1413 1414 do { 1415 if (task != NULL) { 1416 scsi_free_scsi_task(task); 1417 task = NULL; 1418 } 1419 1420 switch (iscsilun->type) { 1421 case TYPE_DISK: 1422 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1423 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1424 rc16 = scsi_datain_unmarshall(task); 1425 if (rc16 == NULL) { 1426 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1427 } else { 1428 iscsilun->block_size = rc16->block_length; 1429 iscsilun->num_blocks = rc16->returned_lba + 1; 1430 iscsilun->lbpme = !!rc16->lbpme; 1431 iscsilun->lbprz = !!rc16->lbprz; 1432 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1433 } 1434 break; 1435 } 1436 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1437 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1438 break; 1439 } 1440 /* Fall through and try READ CAPACITY(10) instead. */ 1441 case TYPE_ROM: 1442 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1443 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1444 rc10 = scsi_datain_unmarshall(task); 1445 if (rc10 == NULL) { 1446 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1447 } else { 1448 iscsilun->block_size = rc10->block_size; 1449 if (rc10->lba == 0) { 1450 /* blank disk loaded */ 1451 iscsilun->num_blocks = 0; 1452 } else { 1453 iscsilun->num_blocks = rc10->lba + 1; 1454 } 1455 } 1456 } 1457 break; 1458 default: 1459 return; 1460 } 1461 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1462 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1463 && retries-- > 0); 1464 1465 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1466 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1467 } else if (!iscsilun->block_size || 1468 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1469 error_setg(errp, "iSCSI: the target returned an invalid " 1470 "block size of %d.", iscsilun->block_size); 1471 } 1472 if (task) { 1473 scsi_free_scsi_task(task); 1474 } 1475 } 1476 1477 /* TODO Convert to fine grained options */ 1478 static QemuOptsList runtime_opts = { 1479 .name = "iscsi", 1480 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1481 .desc = { 1482 { 1483 .name = "filename", 1484 .type = QEMU_OPT_STRING, 1485 .help = "URL to the iscsi image", 1486 }, 1487 { /* end of list */ } 1488 }, 1489 }; 1490 1491 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1492 int evpd, int pc, void **inq, Error **errp) 1493 { 1494 int full_size; 1495 struct scsi_task *task = NULL; 1496 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1497 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1498 goto fail; 1499 } 1500 full_size = scsi_datain_getfullsize(task); 1501 if (full_size > task->datain.size) { 1502 scsi_free_scsi_task(task); 1503 1504 /* we need more data for the full list */ 1505 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1506 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1507 goto fail; 1508 } 1509 } 1510 1511 *inq = scsi_datain_unmarshall(task); 1512 if (*inq == NULL) { 1513 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1514 goto fail_with_err; 1515 } 1516 1517 return task; 1518 1519 fail: 1520 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1521 iscsi_get_error(iscsi)); 1522 fail_with_err: 1523 if (task != NULL) { 1524 scsi_free_scsi_task(task); 1525 } 1526 return NULL; 1527 } 1528 1529 static void iscsi_detach_aio_context(BlockDriverState *bs) 1530 { 1531 IscsiLun *iscsilun = bs->opaque; 1532 1533 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1534 false, NULL, NULL, NULL, NULL); 1535 iscsilun->events = 0; 1536 1537 if (iscsilun->nop_timer) { 1538 timer_del(iscsilun->nop_timer); 1539 timer_free(iscsilun->nop_timer); 1540 iscsilun->nop_timer = NULL; 1541 } 1542 if (iscsilun->event_timer) { 1543 timer_del(iscsilun->event_timer); 1544 timer_free(iscsilun->event_timer); 1545 iscsilun->event_timer = NULL; 1546 } 1547 } 1548 1549 static void iscsi_attach_aio_context(BlockDriverState *bs, 1550 AioContext *new_context) 1551 { 1552 IscsiLun *iscsilun = bs->opaque; 1553 1554 iscsilun->aio_context = new_context; 1555 iscsi_set_events(iscsilun); 1556 1557 /* Set up a timer for sending out iSCSI NOPs */ 1558 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1559 QEMU_CLOCK_REALTIME, SCALE_MS, 1560 iscsi_nop_timed_event, iscsilun); 1561 timer_mod(iscsilun->nop_timer, 1562 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1563 1564 /* Set up a timer for periodic calls to iscsi_set_events and to 1565 * scan for command timeout */ 1566 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1567 QEMU_CLOCK_REALTIME, SCALE_MS, 1568 iscsi_timed_check_events, iscsilun); 1569 timer_mod(iscsilun->event_timer, 1570 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1571 } 1572 1573 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1574 { 1575 struct scsi_task *task; 1576 struct scsi_mode_sense *ms = NULL; 1577 iscsilun->write_protected = false; 1578 iscsilun->dpofua = false; 1579 1580 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1581 1, SCSI_MODESENSE_PC_CURRENT, 1582 0x3F, 0, 255); 1583 if (task == NULL) { 1584 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1585 iscsi_get_error(iscsilun->iscsi)); 1586 goto out; 1587 } 1588 1589 if (task->status != SCSI_STATUS_GOOD) { 1590 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1591 goto out; 1592 } 1593 ms = scsi_datain_unmarshall(task); 1594 if (!ms) { 1595 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1596 iscsi_get_error(iscsilun->iscsi)); 1597 goto out; 1598 } 1599 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1600 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1601 1602 out: 1603 if (task) { 1604 scsi_free_scsi_task(task); 1605 } 1606 } 1607 1608 /* 1609 * We support iscsi url's on the form 1610 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1611 */ 1612 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1613 Error **errp) 1614 { 1615 IscsiLun *iscsilun = bs->opaque; 1616 struct iscsi_context *iscsi = NULL; 1617 struct iscsi_url *iscsi_url = NULL; 1618 struct scsi_task *task = NULL; 1619 struct scsi_inquiry_standard *inq = NULL; 1620 struct scsi_inquiry_supported_pages *inq_vpd; 1621 char *initiator_name = NULL; 1622 QemuOpts *opts; 1623 Error *local_err = NULL; 1624 const char *filename; 1625 int i, ret = 0, timeout = 0; 1626 1627 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1628 qemu_opts_absorb_qdict(opts, options, &local_err); 1629 if (local_err) { 1630 error_propagate(errp, local_err); 1631 ret = -EINVAL; 1632 goto out; 1633 } 1634 1635 filename = qemu_opt_get(opts, "filename"); 1636 1637 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1638 if (iscsi_url == NULL) { 1639 error_setg(errp, "Failed to parse URL : %s", filename); 1640 ret = -EINVAL; 1641 goto out; 1642 } 1643 1644 memset(iscsilun, 0, sizeof(IscsiLun)); 1645 1646 initiator_name = parse_initiator_name(iscsi_url->target); 1647 1648 iscsi = iscsi_create_context(initiator_name); 1649 if (iscsi == NULL) { 1650 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1651 ret = -ENOMEM; 1652 goto out; 1653 } 1654 #if LIBISCSI_API_VERSION >= (20160603) 1655 if (iscsi_init_transport(iscsi, iscsi_url->transport)) { 1656 error_setg(errp, ("Error initializing transport.")); 1657 ret = -EINVAL; 1658 goto out; 1659 } 1660 #endif 1661 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1662 error_setg(errp, "iSCSI: Failed to set target name."); 1663 ret = -EINVAL; 1664 goto out; 1665 } 1666 1667 if (iscsi_url->user[0] != '\0') { 1668 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1669 iscsi_url->passwd); 1670 if (ret != 0) { 1671 error_setg(errp, "Failed to set initiator username and password"); 1672 ret = -EINVAL; 1673 goto out; 1674 } 1675 } 1676 1677 /* check if we got CHAP username/password via the options */ 1678 parse_chap(iscsi, iscsi_url->target, &local_err); 1679 if (local_err != NULL) { 1680 error_propagate(errp, local_err); 1681 ret = -EINVAL; 1682 goto out; 1683 } 1684 1685 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1686 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1687 ret = -EINVAL; 1688 goto out; 1689 } 1690 1691 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1692 1693 /* check if we got HEADER_DIGEST via the options */ 1694 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1695 if (local_err != NULL) { 1696 error_propagate(errp, local_err); 1697 ret = -EINVAL; 1698 goto out; 1699 } 1700 1701 /* timeout handling is broken in libiscsi before 1.15.0 */ 1702 timeout = parse_timeout(iscsi_url->target); 1703 #if LIBISCSI_API_VERSION >= 20150621 1704 iscsi_set_timeout(iscsi, timeout); 1705 #else 1706 if (timeout) { 1707 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1708 } 1709 #endif 1710 1711 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1712 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1713 iscsi_get_error(iscsi)); 1714 ret = -EINVAL; 1715 goto out; 1716 } 1717 1718 iscsilun->iscsi = iscsi; 1719 iscsilun->aio_context = bdrv_get_aio_context(bs); 1720 iscsilun->lun = iscsi_url->lun; 1721 iscsilun->has_write_same = true; 1722 1723 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1724 (void **) &inq, errp); 1725 if (task == NULL) { 1726 ret = -EINVAL; 1727 goto out; 1728 } 1729 iscsilun->type = inq->periperal_device_type; 1730 scsi_free_scsi_task(task); 1731 task = NULL; 1732 1733 iscsi_modesense_sync(iscsilun); 1734 if (iscsilun->dpofua) { 1735 bs->supported_write_flags = BDRV_REQ_FUA; 1736 } 1737 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1738 1739 /* Check the write protect flag of the LUN if we want to write */ 1740 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1741 iscsilun->write_protected) { 1742 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1743 ret = -EACCES; 1744 goto out; 1745 } 1746 1747 iscsi_readcapacity_sync(iscsilun, &local_err); 1748 if (local_err != NULL) { 1749 error_propagate(errp, local_err); 1750 ret = -EINVAL; 1751 goto out; 1752 } 1753 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1754 1755 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1756 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1757 * will try to read from the device to guess the image format. 1758 */ 1759 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1760 bs->sg = true; 1761 } 1762 1763 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1764 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1765 (void **) &inq_vpd, errp); 1766 if (task == NULL) { 1767 ret = -EINVAL; 1768 goto out; 1769 } 1770 for (i = 0; i < inq_vpd->num_pages; i++) { 1771 struct scsi_task *inq_task; 1772 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1773 struct scsi_inquiry_block_limits *inq_bl; 1774 switch (inq_vpd->pages[i]) { 1775 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1776 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1777 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1778 (void **) &inq_lbp, errp); 1779 if (inq_task == NULL) { 1780 ret = -EINVAL; 1781 goto out; 1782 } 1783 memcpy(&iscsilun->lbp, inq_lbp, 1784 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1785 scsi_free_scsi_task(inq_task); 1786 break; 1787 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1788 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1789 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1790 (void **) &inq_bl, errp); 1791 if (inq_task == NULL) { 1792 ret = -EINVAL; 1793 goto out; 1794 } 1795 memcpy(&iscsilun->bl, inq_bl, 1796 sizeof(struct scsi_inquiry_block_limits)); 1797 scsi_free_scsi_task(inq_task); 1798 break; 1799 default: 1800 break; 1801 } 1802 } 1803 scsi_free_scsi_task(task); 1804 task = NULL; 1805 1806 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1807 1808 /* Guess the internal cluster (page) size of the iscsi target by the means 1809 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1810 * reasonable size */ 1811 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1812 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1813 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1814 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1815 if (iscsilun->lbprz) { 1816 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1817 } 1818 } 1819 1820 out: 1821 qemu_opts_del(opts); 1822 g_free(initiator_name); 1823 if (iscsi_url != NULL) { 1824 iscsi_destroy_url(iscsi_url); 1825 } 1826 if (task != NULL) { 1827 scsi_free_scsi_task(task); 1828 } 1829 1830 if (ret) { 1831 if (iscsi != NULL) { 1832 if (iscsi_is_logged_in(iscsi)) { 1833 iscsi_logout_sync(iscsi); 1834 } 1835 iscsi_destroy_context(iscsi); 1836 } 1837 memset(iscsilun, 0, sizeof(IscsiLun)); 1838 } 1839 return ret; 1840 } 1841 1842 static void iscsi_close(BlockDriverState *bs) 1843 { 1844 IscsiLun *iscsilun = bs->opaque; 1845 struct iscsi_context *iscsi = iscsilun->iscsi; 1846 1847 iscsi_detach_aio_context(bs); 1848 if (iscsi_is_logged_in(iscsi)) { 1849 iscsi_logout_sync(iscsi); 1850 } 1851 iscsi_destroy_context(iscsi); 1852 g_free(iscsilun->zeroblock); 1853 iscsi_allocmap_free(iscsilun); 1854 memset(iscsilun, 0, sizeof(IscsiLun)); 1855 } 1856 1857 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1858 { 1859 /* We don't actually refresh here, but just return data queried in 1860 * iscsi_open(): iscsi targets don't change their limits. */ 1861 1862 IscsiLun *iscsilun = bs->opaque; 1863 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 1864 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 1865 1866 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 1867 1868 bs->bl.request_alignment = block_size; 1869 1870 if (iscsilun->bl.max_xfer_len) { 1871 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 1872 } 1873 1874 if (max_xfer_len * block_size < INT_MAX) { 1875 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 1876 } 1877 1878 if (iscsilun->lbp.lbpu) { 1879 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 1880 bs->bl.max_pdiscard = 1881 iscsilun->bl.max_unmap * iscsilun->block_size; 1882 } 1883 bs->bl.pdiscard_alignment = 1884 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1885 } else { 1886 bs->bl.pdiscard_alignment = iscsilun->block_size; 1887 } 1888 1889 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 1890 bs->bl.max_pwrite_zeroes = 1891 iscsilun->bl.max_ws_len * iscsilun->block_size; 1892 } 1893 if (iscsilun->lbp.lbpws) { 1894 bs->bl.pwrite_zeroes_alignment = 1895 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1896 } else { 1897 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 1898 } 1899 if (iscsilun->bl.opt_xfer_len && 1900 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 1901 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 1902 iscsilun->block_size); 1903 } 1904 } 1905 1906 /* Note that this will not re-establish a connection with an iSCSI target - it 1907 * is effectively a NOP. */ 1908 static int iscsi_reopen_prepare(BDRVReopenState *state, 1909 BlockReopenQueue *queue, Error **errp) 1910 { 1911 IscsiLun *iscsilun = state->bs->opaque; 1912 1913 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 1914 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1915 return -EACCES; 1916 } 1917 return 0; 1918 } 1919 1920 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 1921 { 1922 IscsiLun *iscsilun = reopen_state->bs->opaque; 1923 1924 /* the cache.direct status might have changed */ 1925 if (iscsilun->allocmap != NULL) { 1926 iscsi_allocmap_init(iscsilun, reopen_state->flags); 1927 } 1928 } 1929 1930 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1931 { 1932 IscsiLun *iscsilun = bs->opaque; 1933 Error *local_err = NULL; 1934 1935 if (iscsilun->type != TYPE_DISK) { 1936 return -ENOTSUP; 1937 } 1938 1939 iscsi_readcapacity_sync(iscsilun, &local_err); 1940 if (local_err != NULL) { 1941 error_free(local_err); 1942 return -EIO; 1943 } 1944 1945 if (offset > iscsi_getlength(bs)) { 1946 return -EINVAL; 1947 } 1948 1949 if (iscsilun->allocmap != NULL) { 1950 iscsi_allocmap_init(iscsilun, bs->open_flags); 1951 } 1952 1953 return 0; 1954 } 1955 1956 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) 1957 { 1958 int ret = 0; 1959 int64_t total_size = 0; 1960 BlockDriverState *bs; 1961 IscsiLun *iscsilun = NULL; 1962 QDict *bs_options; 1963 1964 bs = bdrv_new(); 1965 1966 /* Read out options */ 1967 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1968 BDRV_SECTOR_SIZE); 1969 bs->opaque = g_new0(struct IscsiLun, 1); 1970 iscsilun = bs->opaque; 1971 1972 bs_options = qdict_new(); 1973 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1974 ret = iscsi_open(bs, bs_options, 0, NULL); 1975 QDECREF(bs_options); 1976 1977 if (ret != 0) { 1978 goto out; 1979 } 1980 iscsi_detach_aio_context(bs); 1981 if (iscsilun->type != TYPE_DISK) { 1982 ret = -ENODEV; 1983 goto out; 1984 } 1985 if (bs->total_sectors < total_size) { 1986 ret = -ENOSPC; 1987 goto out; 1988 } 1989 1990 ret = 0; 1991 out: 1992 if (iscsilun->iscsi != NULL) { 1993 iscsi_destroy_context(iscsilun->iscsi); 1994 } 1995 g_free(bs->opaque); 1996 bs->opaque = NULL; 1997 bdrv_unref(bs); 1998 return ret; 1999 } 2000 2001 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2002 { 2003 IscsiLun *iscsilun = bs->opaque; 2004 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 2005 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 2006 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 2007 return 0; 2008 } 2009 2010 static void iscsi_invalidate_cache(BlockDriverState *bs, 2011 Error **errp) 2012 { 2013 IscsiLun *iscsilun = bs->opaque; 2014 iscsi_allocmap_invalidate(iscsilun); 2015 } 2016 2017 static QemuOptsList iscsi_create_opts = { 2018 .name = "iscsi-create-opts", 2019 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2020 .desc = { 2021 { 2022 .name = BLOCK_OPT_SIZE, 2023 .type = QEMU_OPT_SIZE, 2024 .help = "Virtual disk size" 2025 }, 2026 { /* end of list */ } 2027 } 2028 }; 2029 2030 static BlockDriver bdrv_iscsi = { 2031 .format_name = "iscsi", 2032 .protocol_name = "iscsi", 2033 2034 .instance_size = sizeof(IscsiLun), 2035 .bdrv_needs_filename = true, 2036 .bdrv_file_open = iscsi_open, 2037 .bdrv_close = iscsi_close, 2038 .bdrv_create = iscsi_create, 2039 .create_opts = &iscsi_create_opts, 2040 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2041 .bdrv_reopen_commit = iscsi_reopen_commit, 2042 .bdrv_invalidate_cache = iscsi_invalidate_cache, 2043 2044 .bdrv_getlength = iscsi_getlength, 2045 .bdrv_get_info = iscsi_get_info, 2046 .bdrv_truncate = iscsi_truncate, 2047 .bdrv_refresh_limits = iscsi_refresh_limits, 2048 2049 .bdrv_co_get_block_status = iscsi_co_get_block_status, 2050 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2051 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2052 .bdrv_co_readv = iscsi_co_readv, 2053 .bdrv_co_writev_flags = iscsi_co_writev_flags, 2054 .bdrv_co_flush_to_disk = iscsi_co_flush, 2055 2056 #ifdef __linux__ 2057 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2058 #endif 2059 2060 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2061 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2062 }; 2063 2064 #if LIBISCSI_API_VERSION >= (20160603) 2065 static BlockDriver bdrv_iser = { 2066 .format_name = "iser", 2067 .protocol_name = "iser", 2068 2069 .instance_size = sizeof(IscsiLun), 2070 .bdrv_needs_filename = true, 2071 .bdrv_file_open = iscsi_open, 2072 .bdrv_close = iscsi_close, 2073 .bdrv_create = iscsi_create, 2074 .create_opts = &iscsi_create_opts, 2075 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2076 .bdrv_reopen_commit = iscsi_reopen_commit, 2077 .bdrv_invalidate_cache = iscsi_invalidate_cache, 2078 2079 .bdrv_getlength = iscsi_getlength, 2080 .bdrv_get_info = iscsi_get_info, 2081 .bdrv_truncate = iscsi_truncate, 2082 .bdrv_refresh_limits = iscsi_refresh_limits, 2083 2084 .bdrv_co_get_block_status = iscsi_co_get_block_status, 2085 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2086 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2087 .bdrv_co_readv = iscsi_co_readv, 2088 .bdrv_co_writev_flags = iscsi_co_writev_flags, 2089 .bdrv_co_flush_to_disk = iscsi_co_flush, 2090 2091 #ifdef __linux__ 2092 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2093 #endif 2094 2095 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2096 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2097 }; 2098 #endif 2099 2100 static void iscsi_block_init(void) 2101 { 2102 bdrv_register(&bdrv_iscsi); 2103 #if LIBISCSI_API_VERSION >= (20160603) 2104 bdrv_register(&bdrv_iser); 2105 #endif 2106 } 2107 2108 block_init(iscsi_block_init); 2109