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 iscsilun); 366 iscsilun->events = ev; 367 } 368 } 369 370 static void iscsi_timed_check_events(void *opaque) 371 { 372 IscsiLun *iscsilun = opaque; 373 374 /* check for timed out requests */ 375 iscsi_service(iscsilun->iscsi, 0); 376 377 if (iscsilun->request_timed_out) { 378 iscsilun->request_timed_out = false; 379 iscsi_reconnect(iscsilun->iscsi); 380 } 381 382 /* newer versions of libiscsi may return zero events. Ensure we are able 383 * to return to service once this situation changes. */ 384 iscsi_set_events(iscsilun); 385 386 timer_mod(iscsilun->event_timer, 387 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 388 } 389 390 static void 391 iscsi_process_read(void *arg) 392 { 393 IscsiLun *iscsilun = arg; 394 struct iscsi_context *iscsi = iscsilun->iscsi; 395 396 iscsi_service(iscsi, POLLIN); 397 iscsi_set_events(iscsilun); 398 } 399 400 static void 401 iscsi_process_write(void *arg) 402 { 403 IscsiLun *iscsilun = arg; 404 struct iscsi_context *iscsi = iscsilun->iscsi; 405 406 iscsi_service(iscsi, POLLOUT); 407 iscsi_set_events(iscsilun); 408 } 409 410 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 411 { 412 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 413 } 414 415 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 416 { 417 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 418 } 419 420 static bool is_byte_request_lun_aligned(int64_t offset, int count, 421 IscsiLun *iscsilun) 422 { 423 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 424 error_report("iSCSI misaligned request: " 425 "iscsilun->block_size %u, offset %" PRIi64 426 ", count %d", 427 iscsilun->block_size, offset, count); 428 return false; 429 } 430 return true; 431 } 432 433 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 434 IscsiLun *iscsilun) 435 { 436 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 437 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 438 nb_sectors << BDRV_SECTOR_BITS, 439 iscsilun); 440 } 441 442 static void iscsi_allocmap_free(IscsiLun *iscsilun) 443 { 444 g_free(iscsilun->allocmap); 445 g_free(iscsilun->allocmap_valid); 446 iscsilun->allocmap = NULL; 447 iscsilun->allocmap_valid = NULL; 448 } 449 450 451 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 452 { 453 iscsi_allocmap_free(iscsilun); 454 455 iscsilun->allocmap_size = 456 DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun), 457 iscsilun->cluster_sectors); 458 459 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 460 if (!iscsilun->allocmap) { 461 return -ENOMEM; 462 } 463 464 if (open_flags & BDRV_O_NOCACHE) { 465 /* in case that cache.direct = on all allocmap entries are 466 * treated as invalid to force a relookup of the block 467 * status on every read request */ 468 return 0; 469 } 470 471 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 472 if (!iscsilun->allocmap_valid) { 473 /* if we are under memory pressure free the allocmap as well */ 474 iscsi_allocmap_free(iscsilun); 475 return -ENOMEM; 476 } 477 478 return 0; 479 } 480 481 static void 482 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num, 483 int nb_sectors, bool allocated, bool valid) 484 { 485 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 486 487 if (iscsilun->allocmap == NULL) { 488 return; 489 } 490 /* expand to entirely contain all affected clusters */ 491 cl_num_expanded = sector_num / iscsilun->cluster_sectors; 492 nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors, 493 iscsilun->cluster_sectors) - cl_num_expanded; 494 /* shrink to touch only completely contained clusters */ 495 cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 496 nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors 497 - cl_num_shrunk; 498 if (allocated) { 499 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 500 } else { 501 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 502 } 503 504 if (iscsilun->allocmap_valid == NULL) { 505 return; 506 } 507 if (valid) { 508 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 509 } else { 510 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 511 nb_cls_expanded); 512 } 513 } 514 515 static void 516 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num, 517 int nb_sectors) 518 { 519 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true); 520 } 521 522 static void 523 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num, 524 int nb_sectors) 525 { 526 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 527 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 528 */ 529 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true); 530 } 531 532 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num, 533 int nb_sectors) 534 { 535 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false); 536 } 537 538 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 539 { 540 if (iscsilun->allocmap) { 541 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 542 } 543 if (iscsilun->allocmap_valid) { 544 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 545 } 546 } 547 548 static inline bool 549 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num, 550 int nb_sectors) 551 { 552 unsigned long size; 553 if (iscsilun->allocmap == NULL) { 554 return true; 555 } 556 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 557 return !(find_next_bit(iscsilun->allocmap, size, 558 sector_num / iscsilun->cluster_sectors) == size); 559 } 560 561 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 562 int64_t sector_num, int nb_sectors) 563 { 564 unsigned long size; 565 if (iscsilun->allocmap_valid == NULL) { 566 return false; 567 } 568 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 569 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 570 sector_num / iscsilun->cluster_sectors) == size); 571 } 572 573 static int coroutine_fn 574 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 575 QEMUIOVector *iov, int flags) 576 { 577 IscsiLun *iscsilun = bs->opaque; 578 struct IscsiTask iTask; 579 uint64_t lba; 580 uint32_t num_sectors; 581 bool fua = flags & BDRV_REQ_FUA; 582 583 if (fua) { 584 assert(iscsilun->dpofua); 585 } 586 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 587 return -EINVAL; 588 } 589 590 if (bs->bl.max_transfer) { 591 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 592 } 593 594 lba = sector_qemu2lun(sector_num, iscsilun); 595 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 596 iscsi_co_init_iscsitask(iscsilun, &iTask); 597 retry: 598 if (iscsilun->use_16_for_rw) { 599 #if LIBISCSI_API_VERSION >= (20160603) 600 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 601 NULL, num_sectors * iscsilun->block_size, 602 iscsilun->block_size, 0, 0, fua, 0, 0, 603 iscsi_co_generic_cb, &iTask, 604 (struct scsi_iovec *)iov->iov, iov->niov); 605 } else { 606 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 607 NULL, num_sectors * iscsilun->block_size, 608 iscsilun->block_size, 0, 0, fua, 0, 0, 609 iscsi_co_generic_cb, &iTask, 610 (struct scsi_iovec *)iov->iov, iov->niov); 611 } 612 #else 613 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 614 NULL, num_sectors * iscsilun->block_size, 615 iscsilun->block_size, 0, 0, fua, 0, 0, 616 iscsi_co_generic_cb, &iTask); 617 } else { 618 iTask.task = iscsi_write10_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 } 623 #endif 624 if (iTask.task == NULL) { 625 return -ENOMEM; 626 } 627 #if LIBISCSI_API_VERSION < (20160603) 628 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 629 iov->niov); 630 #endif 631 while (!iTask.complete) { 632 iscsi_set_events(iscsilun); 633 qemu_coroutine_yield(); 634 } 635 636 if (iTask.task != NULL) { 637 scsi_free_scsi_task(iTask.task); 638 iTask.task = NULL; 639 } 640 641 if (iTask.do_retry) { 642 iTask.complete = 0; 643 goto retry; 644 } 645 646 if (iTask.status != SCSI_STATUS_GOOD) { 647 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors); 648 return iTask.err_code; 649 } 650 651 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors); 652 653 return 0; 654 } 655 656 657 658 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 659 int64_t sector_num, 660 int nb_sectors, int *pnum, 661 BlockDriverState **file) 662 { 663 IscsiLun *iscsilun = bs->opaque; 664 struct scsi_get_lba_status *lbas = NULL; 665 struct scsi_lba_status_descriptor *lbasd = NULL; 666 struct IscsiTask iTask; 667 int64_t ret; 668 669 iscsi_co_init_iscsitask(iscsilun, &iTask); 670 671 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 672 ret = -EINVAL; 673 goto out; 674 } 675 676 /* default to all sectors allocated */ 677 ret = BDRV_BLOCK_DATA; 678 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 679 *pnum = nb_sectors; 680 681 /* LUN does not support logical block provisioning */ 682 if (!iscsilun->lbpme) { 683 goto out; 684 } 685 686 retry: 687 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 688 sector_qemu2lun(sector_num, iscsilun), 689 8 + 16, iscsi_co_generic_cb, 690 &iTask) == NULL) { 691 ret = -ENOMEM; 692 goto out; 693 } 694 695 while (!iTask.complete) { 696 iscsi_set_events(iscsilun); 697 qemu_coroutine_yield(); 698 } 699 700 if (iTask.do_retry) { 701 if (iTask.task != NULL) { 702 scsi_free_scsi_task(iTask.task); 703 iTask.task = NULL; 704 } 705 iTask.complete = 0; 706 goto retry; 707 } 708 709 if (iTask.status != SCSI_STATUS_GOOD) { 710 /* in case the get_lba_status_callout fails (i.e. 711 * because the device is busy or the cmd is not 712 * supported) we pretend all blocks are allocated 713 * for backwards compatibility */ 714 goto out; 715 } 716 717 lbas = scsi_datain_unmarshall(iTask.task); 718 if (lbas == NULL) { 719 ret = -EIO; 720 goto out; 721 } 722 723 lbasd = &lbas->descriptors[0]; 724 725 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 726 ret = -EIO; 727 goto out; 728 } 729 730 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 731 732 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 733 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 734 ret &= ~BDRV_BLOCK_DATA; 735 if (iscsilun->lbprz) { 736 ret |= BDRV_BLOCK_ZERO; 737 } 738 } 739 740 if (ret & BDRV_BLOCK_ZERO) { 741 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum); 742 } else { 743 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum); 744 } 745 746 if (*pnum > nb_sectors) { 747 *pnum = nb_sectors; 748 } 749 out: 750 if (iTask.task != NULL) { 751 scsi_free_scsi_task(iTask.task); 752 } 753 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) { 754 *file = bs; 755 } 756 return ret; 757 } 758 759 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 760 int64_t sector_num, int nb_sectors, 761 QEMUIOVector *iov) 762 { 763 IscsiLun *iscsilun = bs->opaque; 764 struct IscsiTask iTask; 765 uint64_t lba; 766 uint32_t num_sectors; 767 768 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 769 return -EINVAL; 770 } 771 772 if (bs->bl.max_transfer) { 773 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 774 } 775 776 /* if cache.direct is off and we have a valid entry in our allocation map 777 * we can skip checking the block status and directly return zeroes if 778 * the request falls within an unallocated area */ 779 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 780 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 781 qemu_iovec_memset(iov, 0, 0x00, iov->size); 782 return 0; 783 } 784 785 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 786 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 787 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 788 int pnum; 789 BlockDriverState *file; 790 /* check the block status from the beginning of the cluster 791 * containing the start sector */ 792 int64_t ret = iscsi_co_get_block_status(bs, 793 sector_num - sector_num % iscsilun->cluster_sectors, 794 BDRV_REQUEST_MAX_SECTORS, &pnum, &file); 795 if (ret < 0) { 796 return ret; 797 } 798 /* if the whole request falls into an unallocated area we can avoid 799 * to read and directly return zeroes instead */ 800 if (ret & BDRV_BLOCK_ZERO && 801 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) { 802 qemu_iovec_memset(iov, 0, 0x00, iov->size); 803 return 0; 804 } 805 } 806 807 lba = sector_qemu2lun(sector_num, iscsilun); 808 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 809 810 iscsi_co_init_iscsitask(iscsilun, &iTask); 811 retry: 812 if (iscsilun->use_16_for_rw) { 813 #if LIBISCSI_API_VERSION >= (20160603) 814 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 815 num_sectors * iscsilun->block_size, 816 iscsilun->block_size, 0, 0, 0, 0, 0, 817 iscsi_co_generic_cb, &iTask, 818 (struct scsi_iovec *)iov->iov, iov->niov); 819 } else { 820 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba, 821 num_sectors * iscsilun->block_size, 822 iscsilun->block_size, 823 0, 0, 0, 0, 0, 824 iscsi_co_generic_cb, &iTask, 825 (struct scsi_iovec *)iov->iov, iov->niov); 826 } 827 #else 828 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 829 num_sectors * iscsilun->block_size, 830 iscsilun->block_size, 0, 0, 0, 0, 0, 831 iscsi_co_generic_cb, &iTask); 832 } else { 833 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 834 num_sectors * iscsilun->block_size, 835 iscsilun->block_size, 836 0, 0, 0, 0, 0, 837 iscsi_co_generic_cb, &iTask); 838 } 839 #endif 840 if (iTask.task == NULL) { 841 return -ENOMEM; 842 } 843 #if LIBISCSI_API_VERSION < (20160603) 844 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 845 #endif 846 while (!iTask.complete) { 847 iscsi_set_events(iscsilun); 848 qemu_coroutine_yield(); 849 } 850 851 if (iTask.task != NULL) { 852 scsi_free_scsi_task(iTask.task); 853 iTask.task = NULL; 854 } 855 856 if (iTask.do_retry) { 857 iTask.complete = 0; 858 goto retry; 859 } 860 861 if (iTask.status != SCSI_STATUS_GOOD) { 862 return iTask.err_code; 863 } 864 865 return 0; 866 } 867 868 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 869 { 870 IscsiLun *iscsilun = bs->opaque; 871 struct IscsiTask iTask; 872 873 iscsi_co_init_iscsitask(iscsilun, &iTask); 874 retry: 875 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 876 0, iscsi_co_generic_cb, &iTask) == NULL) { 877 return -ENOMEM; 878 } 879 880 while (!iTask.complete) { 881 iscsi_set_events(iscsilun); 882 qemu_coroutine_yield(); 883 } 884 885 if (iTask.task != NULL) { 886 scsi_free_scsi_task(iTask.task); 887 iTask.task = NULL; 888 } 889 890 if (iTask.do_retry) { 891 iTask.complete = 0; 892 goto retry; 893 } 894 895 if (iTask.status != SCSI_STATUS_GOOD) { 896 return iTask.err_code; 897 } 898 899 return 0; 900 } 901 902 #ifdef __linux__ 903 static void 904 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 905 void *command_data, void *opaque) 906 { 907 IscsiAIOCB *acb = opaque; 908 909 g_free(acb->buf); 910 acb->buf = NULL; 911 912 acb->status = 0; 913 if (status < 0) { 914 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 915 iscsi_get_error(iscsi)); 916 acb->status = iscsi_translate_sense(&acb->task->sense); 917 } 918 919 acb->ioh->driver_status = 0; 920 acb->ioh->host_status = 0; 921 acb->ioh->resid = 0; 922 acb->ioh->status = status; 923 924 #define SG_ERR_DRIVER_SENSE 0x08 925 926 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 927 int ss; 928 929 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 930 931 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 932 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 933 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 934 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 935 } 936 937 iscsi_schedule_bh(acb); 938 } 939 940 static void iscsi_ioctl_bh_completion(void *opaque) 941 { 942 IscsiAIOCB *acb = opaque; 943 944 qemu_bh_delete(acb->bh); 945 acb->common.cb(acb->common.opaque, acb->ret); 946 qemu_aio_unref(acb); 947 } 948 949 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 950 { 951 BlockDriverState *bs = acb->common.bs; 952 IscsiLun *iscsilun = bs->opaque; 953 int ret = 0; 954 955 switch (req) { 956 case SG_GET_VERSION_NUM: 957 *(int *)buf = 30000; 958 break; 959 case SG_GET_SCSI_ID: 960 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 961 break; 962 default: 963 ret = -EINVAL; 964 } 965 assert(!acb->bh); 966 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 967 iscsi_ioctl_bh_completion, acb); 968 acb->ret = ret; 969 qemu_bh_schedule(acb->bh); 970 } 971 972 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 973 unsigned long int req, void *buf, 974 BlockCompletionFunc *cb, void *opaque) 975 { 976 IscsiLun *iscsilun = bs->opaque; 977 struct iscsi_context *iscsi = iscsilun->iscsi; 978 struct iscsi_data data; 979 IscsiAIOCB *acb; 980 981 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 982 983 acb->iscsilun = iscsilun; 984 acb->bh = NULL; 985 acb->status = -EINPROGRESS; 986 acb->buf = NULL; 987 acb->ioh = buf; 988 989 if (req != SG_IO) { 990 iscsi_ioctl_handle_emulated(acb, req, buf); 991 return &acb->common; 992 } 993 994 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 995 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 996 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 997 qemu_aio_unref(acb); 998 return NULL; 999 } 1000 1001 acb->task = malloc(sizeof(struct scsi_task)); 1002 if (acb->task == NULL) { 1003 error_report("iSCSI: Failed to allocate task for scsi command. %s", 1004 iscsi_get_error(iscsi)); 1005 qemu_aio_unref(acb); 1006 return NULL; 1007 } 1008 memset(acb->task, 0, sizeof(struct scsi_task)); 1009 1010 switch (acb->ioh->dxfer_direction) { 1011 case SG_DXFER_TO_DEV: 1012 acb->task->xfer_dir = SCSI_XFER_WRITE; 1013 break; 1014 case SG_DXFER_FROM_DEV: 1015 acb->task->xfer_dir = SCSI_XFER_READ; 1016 break; 1017 default: 1018 acb->task->xfer_dir = SCSI_XFER_NONE; 1019 break; 1020 } 1021 1022 acb->task->cdb_size = acb->ioh->cmd_len; 1023 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 1024 acb->task->expxferlen = acb->ioh->dxfer_len; 1025 1026 data.size = 0; 1027 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 1028 if (acb->ioh->iovec_count == 0) { 1029 data.data = acb->ioh->dxferp; 1030 data.size = acb->ioh->dxfer_len; 1031 } else { 1032 scsi_task_set_iov_out(acb->task, 1033 (struct scsi_iovec *) acb->ioh->dxferp, 1034 acb->ioh->iovec_count); 1035 } 1036 } 1037 1038 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1039 iscsi_aio_ioctl_cb, 1040 (data.size > 0) ? &data : NULL, 1041 acb) != 0) { 1042 scsi_free_scsi_task(acb->task); 1043 qemu_aio_unref(acb); 1044 return NULL; 1045 } 1046 1047 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1048 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1049 if (acb->ioh->iovec_count == 0) { 1050 scsi_task_add_data_in_buffer(acb->task, 1051 acb->ioh->dxfer_len, 1052 acb->ioh->dxferp); 1053 } else { 1054 scsi_task_set_iov_in(acb->task, 1055 (struct scsi_iovec *) acb->ioh->dxferp, 1056 acb->ioh->iovec_count); 1057 } 1058 } 1059 1060 iscsi_set_events(iscsilun); 1061 1062 return &acb->common; 1063 } 1064 1065 #endif 1066 1067 static int64_t 1068 iscsi_getlength(BlockDriverState *bs) 1069 { 1070 IscsiLun *iscsilun = bs->opaque; 1071 int64_t len; 1072 1073 len = iscsilun->num_blocks; 1074 len *= iscsilun->block_size; 1075 1076 return len; 1077 } 1078 1079 static int 1080 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int count) 1081 { 1082 IscsiLun *iscsilun = bs->opaque; 1083 struct IscsiTask iTask; 1084 struct unmap_list list; 1085 1086 assert(is_byte_request_lun_aligned(offset, count, iscsilun)); 1087 1088 if (!iscsilun->lbp.lbpu) { 1089 /* UNMAP is not supported by the target */ 1090 return 0; 1091 } 1092 1093 list.lba = offset / iscsilun->block_size; 1094 list.num = count / iscsilun->block_size; 1095 1096 iscsi_co_init_iscsitask(iscsilun, &iTask); 1097 retry: 1098 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1099 iscsi_co_generic_cb, &iTask) == NULL) { 1100 return -ENOMEM; 1101 } 1102 1103 while (!iTask.complete) { 1104 iscsi_set_events(iscsilun); 1105 qemu_coroutine_yield(); 1106 } 1107 1108 if (iTask.task != NULL) { 1109 scsi_free_scsi_task(iTask.task); 1110 iTask.task = NULL; 1111 } 1112 1113 if (iTask.do_retry) { 1114 iTask.complete = 0; 1115 goto retry; 1116 } 1117 1118 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1119 /* the target might fail with a check condition if it 1120 is not happy with the alignment of the UNMAP request 1121 we silently fail in this case */ 1122 return 0; 1123 } 1124 1125 if (iTask.status != SCSI_STATUS_GOOD) { 1126 return iTask.err_code; 1127 } 1128 1129 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1130 count >> BDRV_SECTOR_BITS); 1131 1132 return 0; 1133 } 1134 1135 static int 1136 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1137 int count, BdrvRequestFlags flags) 1138 { 1139 IscsiLun *iscsilun = bs->opaque; 1140 struct IscsiTask iTask; 1141 uint64_t lba; 1142 uint32_t nb_blocks; 1143 bool use_16_for_ws = iscsilun->use_16_for_rw; 1144 1145 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) { 1146 return -ENOTSUP; 1147 } 1148 1149 if (flags & BDRV_REQ_MAY_UNMAP) { 1150 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1151 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1152 use_16_for_ws = true; 1153 } 1154 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1155 /* WRITESAME16 with UNMAP is not supported by the target, 1156 * fall back and try WRITESAME10/16 without UNMAP */ 1157 flags &= ~BDRV_REQ_MAY_UNMAP; 1158 use_16_for_ws = iscsilun->use_16_for_rw; 1159 } 1160 } 1161 1162 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1163 /* WRITESAME without UNMAP is not supported by the target */ 1164 return -ENOTSUP; 1165 } 1166 1167 lba = offset / iscsilun->block_size; 1168 nb_blocks = count / iscsilun->block_size; 1169 1170 if (iscsilun->zeroblock == NULL) { 1171 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1172 if (iscsilun->zeroblock == NULL) { 1173 return -ENOMEM; 1174 } 1175 } 1176 1177 iscsi_co_init_iscsitask(iscsilun, &iTask); 1178 retry: 1179 if (use_16_for_ws) { 1180 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1181 iscsilun->zeroblock, iscsilun->block_size, 1182 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1183 0, 0, iscsi_co_generic_cb, &iTask); 1184 } else { 1185 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1186 iscsilun->zeroblock, iscsilun->block_size, 1187 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1188 0, 0, iscsi_co_generic_cb, &iTask); 1189 } 1190 if (iTask.task == NULL) { 1191 return -ENOMEM; 1192 } 1193 1194 while (!iTask.complete) { 1195 iscsi_set_events(iscsilun); 1196 qemu_coroutine_yield(); 1197 } 1198 1199 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1200 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1201 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1202 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1203 /* WRITE SAME is not supported by the target */ 1204 iscsilun->has_write_same = false; 1205 scsi_free_scsi_task(iTask.task); 1206 return -ENOTSUP; 1207 } 1208 1209 if (iTask.task != NULL) { 1210 scsi_free_scsi_task(iTask.task); 1211 iTask.task = NULL; 1212 } 1213 1214 if (iTask.do_retry) { 1215 iTask.complete = 0; 1216 goto retry; 1217 } 1218 1219 if (iTask.status != SCSI_STATUS_GOOD) { 1220 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1221 count >> BDRV_SECTOR_BITS); 1222 return iTask.err_code; 1223 } 1224 1225 if (flags & BDRV_REQ_MAY_UNMAP) { 1226 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1227 count >> BDRV_SECTOR_BITS); 1228 } else { 1229 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS, 1230 count >> BDRV_SECTOR_BITS); 1231 } 1232 1233 return 0; 1234 } 1235 1236 static void parse_chap(struct iscsi_context *iscsi, const char *target, 1237 Error **errp) 1238 { 1239 QemuOptsList *list; 1240 QemuOpts *opts; 1241 const char *user = NULL; 1242 const char *password = NULL; 1243 const char *secretid; 1244 char *secret = NULL; 1245 1246 list = qemu_find_opts("iscsi"); 1247 if (!list) { 1248 return; 1249 } 1250 1251 opts = qemu_opts_find(list, target); 1252 if (opts == NULL) { 1253 opts = QTAILQ_FIRST(&list->head); 1254 if (!opts) { 1255 return; 1256 } 1257 } 1258 1259 user = qemu_opt_get(opts, "user"); 1260 if (!user) { 1261 return; 1262 } 1263 1264 secretid = qemu_opt_get(opts, "password-secret"); 1265 password = qemu_opt_get(opts, "password"); 1266 if (secretid && password) { 1267 error_setg(errp, "'password' and 'password-secret' properties are " 1268 "mutually exclusive"); 1269 return; 1270 } 1271 if (secretid) { 1272 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1273 if (!secret) { 1274 return; 1275 } 1276 password = secret; 1277 } else if (!password) { 1278 error_setg(errp, "CHAP username specified but no password was given"); 1279 return; 1280 } 1281 1282 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1283 error_setg(errp, "Failed to set initiator username and password"); 1284 } 1285 1286 g_free(secret); 1287 } 1288 1289 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 1290 Error **errp) 1291 { 1292 QemuOptsList *list; 1293 QemuOpts *opts; 1294 const char *digest = NULL; 1295 1296 list = qemu_find_opts("iscsi"); 1297 if (!list) { 1298 return; 1299 } 1300 1301 opts = qemu_opts_find(list, target); 1302 if (opts == NULL) { 1303 opts = QTAILQ_FIRST(&list->head); 1304 if (!opts) { 1305 return; 1306 } 1307 } 1308 1309 digest = qemu_opt_get(opts, "header-digest"); 1310 if (!digest) { 1311 return; 1312 } 1313 1314 if (!strcmp(digest, "CRC32C")) { 1315 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1316 } else if (!strcmp(digest, "NONE")) { 1317 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1318 } else if (!strcmp(digest, "CRC32C-NONE")) { 1319 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1320 } else if (!strcmp(digest, "NONE-CRC32C")) { 1321 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1322 } else { 1323 error_setg(errp, "Invalid header-digest setting : %s", digest); 1324 } 1325 } 1326 1327 static char *parse_initiator_name(const char *target) 1328 { 1329 QemuOptsList *list; 1330 QemuOpts *opts; 1331 const char *name; 1332 char *iscsi_name; 1333 UuidInfo *uuid_info; 1334 1335 list = qemu_find_opts("iscsi"); 1336 if (list) { 1337 opts = qemu_opts_find(list, target); 1338 if (!opts) { 1339 opts = QTAILQ_FIRST(&list->head); 1340 } 1341 if (opts) { 1342 name = qemu_opt_get(opts, "initiator-name"); 1343 if (name) { 1344 return g_strdup(name); 1345 } 1346 } 1347 } 1348 1349 uuid_info = qmp_query_uuid(NULL); 1350 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1351 name = qemu_get_vm_name(); 1352 } else { 1353 name = uuid_info->UUID; 1354 } 1355 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1356 name ? ":" : "", name ? name : ""); 1357 qapi_free_UuidInfo(uuid_info); 1358 return iscsi_name; 1359 } 1360 1361 static int parse_timeout(const char *target) 1362 { 1363 QemuOptsList *list; 1364 QemuOpts *opts; 1365 const char *timeout; 1366 1367 list = qemu_find_opts("iscsi"); 1368 if (list) { 1369 opts = qemu_opts_find(list, target); 1370 if (!opts) { 1371 opts = QTAILQ_FIRST(&list->head); 1372 } 1373 if (opts) { 1374 timeout = qemu_opt_get(opts, "timeout"); 1375 if (timeout) { 1376 return atoi(timeout); 1377 } 1378 } 1379 } 1380 1381 return 0; 1382 } 1383 1384 static void iscsi_nop_timed_event(void *opaque) 1385 { 1386 IscsiLun *iscsilun = opaque; 1387 1388 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1389 error_report("iSCSI: NOP timeout. Reconnecting..."); 1390 iscsilun->request_timed_out = true; 1391 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1392 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1393 return; 1394 } 1395 1396 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1397 iscsi_set_events(iscsilun); 1398 } 1399 1400 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1401 { 1402 struct scsi_task *task = NULL; 1403 struct scsi_readcapacity10 *rc10 = NULL; 1404 struct scsi_readcapacity16 *rc16 = NULL; 1405 int retries = ISCSI_CMD_RETRIES; 1406 1407 do { 1408 if (task != NULL) { 1409 scsi_free_scsi_task(task); 1410 task = NULL; 1411 } 1412 1413 switch (iscsilun->type) { 1414 case TYPE_DISK: 1415 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1416 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1417 rc16 = scsi_datain_unmarshall(task); 1418 if (rc16 == NULL) { 1419 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1420 } else { 1421 iscsilun->block_size = rc16->block_length; 1422 iscsilun->num_blocks = rc16->returned_lba + 1; 1423 iscsilun->lbpme = !!rc16->lbpme; 1424 iscsilun->lbprz = !!rc16->lbprz; 1425 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1426 } 1427 break; 1428 } 1429 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1430 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1431 break; 1432 } 1433 /* Fall through and try READ CAPACITY(10) instead. */ 1434 case TYPE_ROM: 1435 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1436 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1437 rc10 = scsi_datain_unmarshall(task); 1438 if (rc10 == NULL) { 1439 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1440 } else { 1441 iscsilun->block_size = rc10->block_size; 1442 if (rc10->lba == 0) { 1443 /* blank disk loaded */ 1444 iscsilun->num_blocks = 0; 1445 } else { 1446 iscsilun->num_blocks = rc10->lba + 1; 1447 } 1448 } 1449 } 1450 break; 1451 default: 1452 return; 1453 } 1454 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1455 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1456 && retries-- > 0); 1457 1458 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1459 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1460 } else if (!iscsilun->block_size || 1461 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1462 error_setg(errp, "iSCSI: the target returned an invalid " 1463 "block size of %d.", iscsilun->block_size); 1464 } 1465 if (task) { 1466 scsi_free_scsi_task(task); 1467 } 1468 } 1469 1470 /* TODO Convert to fine grained options */ 1471 static QemuOptsList runtime_opts = { 1472 .name = "iscsi", 1473 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1474 .desc = { 1475 { 1476 .name = "filename", 1477 .type = QEMU_OPT_STRING, 1478 .help = "URL to the iscsi image", 1479 }, 1480 { /* end of list */ } 1481 }, 1482 }; 1483 1484 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1485 int evpd, int pc, void **inq, Error **errp) 1486 { 1487 int full_size; 1488 struct scsi_task *task = NULL; 1489 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1490 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1491 goto fail; 1492 } 1493 full_size = scsi_datain_getfullsize(task); 1494 if (full_size > task->datain.size) { 1495 scsi_free_scsi_task(task); 1496 1497 /* we need more data for the full list */ 1498 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1499 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1500 goto fail; 1501 } 1502 } 1503 1504 *inq = scsi_datain_unmarshall(task); 1505 if (*inq == NULL) { 1506 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1507 goto fail_with_err; 1508 } 1509 1510 return task; 1511 1512 fail: 1513 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1514 iscsi_get_error(iscsi)); 1515 fail_with_err: 1516 if (task != NULL) { 1517 scsi_free_scsi_task(task); 1518 } 1519 return NULL; 1520 } 1521 1522 static void iscsi_detach_aio_context(BlockDriverState *bs) 1523 { 1524 IscsiLun *iscsilun = bs->opaque; 1525 1526 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1527 false, NULL, NULL, NULL); 1528 iscsilun->events = 0; 1529 1530 if (iscsilun->nop_timer) { 1531 timer_del(iscsilun->nop_timer); 1532 timer_free(iscsilun->nop_timer); 1533 iscsilun->nop_timer = NULL; 1534 } 1535 if (iscsilun->event_timer) { 1536 timer_del(iscsilun->event_timer); 1537 timer_free(iscsilun->event_timer); 1538 iscsilun->event_timer = NULL; 1539 } 1540 } 1541 1542 static void iscsi_attach_aio_context(BlockDriverState *bs, 1543 AioContext *new_context) 1544 { 1545 IscsiLun *iscsilun = bs->opaque; 1546 1547 iscsilun->aio_context = new_context; 1548 iscsi_set_events(iscsilun); 1549 1550 /* Set up a timer for sending out iSCSI NOPs */ 1551 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1552 QEMU_CLOCK_REALTIME, SCALE_MS, 1553 iscsi_nop_timed_event, iscsilun); 1554 timer_mod(iscsilun->nop_timer, 1555 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1556 1557 /* Set up a timer for periodic calls to iscsi_set_events and to 1558 * scan for command timeout */ 1559 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1560 QEMU_CLOCK_REALTIME, SCALE_MS, 1561 iscsi_timed_check_events, iscsilun); 1562 timer_mod(iscsilun->event_timer, 1563 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1564 } 1565 1566 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1567 { 1568 struct scsi_task *task; 1569 struct scsi_mode_sense *ms = NULL; 1570 iscsilun->write_protected = false; 1571 iscsilun->dpofua = false; 1572 1573 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1574 1, SCSI_MODESENSE_PC_CURRENT, 1575 0x3F, 0, 255); 1576 if (task == NULL) { 1577 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1578 iscsi_get_error(iscsilun->iscsi)); 1579 goto out; 1580 } 1581 1582 if (task->status != SCSI_STATUS_GOOD) { 1583 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1584 goto out; 1585 } 1586 ms = scsi_datain_unmarshall(task); 1587 if (!ms) { 1588 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1589 iscsi_get_error(iscsilun->iscsi)); 1590 goto out; 1591 } 1592 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1593 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1594 1595 out: 1596 if (task) { 1597 scsi_free_scsi_task(task); 1598 } 1599 } 1600 1601 /* 1602 * We support iscsi url's on the form 1603 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1604 */ 1605 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1606 Error **errp) 1607 { 1608 IscsiLun *iscsilun = bs->opaque; 1609 struct iscsi_context *iscsi = NULL; 1610 struct iscsi_url *iscsi_url = NULL; 1611 struct scsi_task *task = NULL; 1612 struct scsi_inquiry_standard *inq = NULL; 1613 struct scsi_inquiry_supported_pages *inq_vpd; 1614 char *initiator_name = NULL; 1615 QemuOpts *opts; 1616 Error *local_err = NULL; 1617 const char *filename; 1618 int i, ret = 0, timeout = 0; 1619 1620 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1621 qemu_opts_absorb_qdict(opts, options, &local_err); 1622 if (local_err) { 1623 error_propagate(errp, local_err); 1624 ret = -EINVAL; 1625 goto out; 1626 } 1627 1628 filename = qemu_opt_get(opts, "filename"); 1629 1630 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1631 if (iscsi_url == NULL) { 1632 error_setg(errp, "Failed to parse URL : %s", filename); 1633 ret = -EINVAL; 1634 goto out; 1635 } 1636 1637 memset(iscsilun, 0, sizeof(IscsiLun)); 1638 1639 initiator_name = parse_initiator_name(iscsi_url->target); 1640 1641 iscsi = iscsi_create_context(initiator_name); 1642 if (iscsi == NULL) { 1643 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1644 ret = -ENOMEM; 1645 goto out; 1646 } 1647 #if LIBISCSI_API_VERSION >= (20160603) 1648 if (iscsi_init_transport(iscsi, iscsi_url->transport)) { 1649 error_setg(errp, ("Error initializing transport.")); 1650 ret = -EINVAL; 1651 goto out; 1652 } 1653 #endif 1654 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1655 error_setg(errp, "iSCSI: Failed to set target name."); 1656 ret = -EINVAL; 1657 goto out; 1658 } 1659 1660 if (iscsi_url->user[0] != '\0') { 1661 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1662 iscsi_url->passwd); 1663 if (ret != 0) { 1664 error_setg(errp, "Failed to set initiator username and password"); 1665 ret = -EINVAL; 1666 goto out; 1667 } 1668 } 1669 1670 /* check if we got CHAP username/password via the options */ 1671 parse_chap(iscsi, iscsi_url->target, &local_err); 1672 if (local_err != NULL) { 1673 error_propagate(errp, local_err); 1674 ret = -EINVAL; 1675 goto out; 1676 } 1677 1678 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1679 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1680 ret = -EINVAL; 1681 goto out; 1682 } 1683 1684 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1685 1686 /* check if we got HEADER_DIGEST via the options */ 1687 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1688 if (local_err != NULL) { 1689 error_propagate(errp, local_err); 1690 ret = -EINVAL; 1691 goto out; 1692 } 1693 1694 /* timeout handling is broken in libiscsi before 1.15.0 */ 1695 timeout = parse_timeout(iscsi_url->target); 1696 #if LIBISCSI_API_VERSION >= 20150621 1697 iscsi_set_timeout(iscsi, timeout); 1698 #else 1699 if (timeout) { 1700 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1701 } 1702 #endif 1703 1704 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1705 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1706 iscsi_get_error(iscsi)); 1707 ret = -EINVAL; 1708 goto out; 1709 } 1710 1711 iscsilun->iscsi = iscsi; 1712 iscsilun->aio_context = bdrv_get_aio_context(bs); 1713 iscsilun->lun = iscsi_url->lun; 1714 iscsilun->has_write_same = true; 1715 1716 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1717 (void **) &inq, errp); 1718 if (task == NULL) { 1719 ret = -EINVAL; 1720 goto out; 1721 } 1722 iscsilun->type = inq->periperal_device_type; 1723 scsi_free_scsi_task(task); 1724 task = NULL; 1725 1726 iscsi_modesense_sync(iscsilun); 1727 if (iscsilun->dpofua) { 1728 bs->supported_write_flags = BDRV_REQ_FUA; 1729 } 1730 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1731 1732 /* Check the write protect flag of the LUN if we want to write */ 1733 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1734 iscsilun->write_protected) { 1735 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1736 ret = -EACCES; 1737 goto out; 1738 } 1739 1740 iscsi_readcapacity_sync(iscsilun, &local_err); 1741 if (local_err != NULL) { 1742 error_propagate(errp, local_err); 1743 ret = -EINVAL; 1744 goto out; 1745 } 1746 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1747 1748 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1749 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1750 * will try to read from the device to guess the image format. 1751 */ 1752 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1753 bs->sg = true; 1754 } 1755 1756 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1757 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1758 (void **) &inq_vpd, errp); 1759 if (task == NULL) { 1760 ret = -EINVAL; 1761 goto out; 1762 } 1763 for (i = 0; i < inq_vpd->num_pages; i++) { 1764 struct scsi_task *inq_task; 1765 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1766 struct scsi_inquiry_block_limits *inq_bl; 1767 switch (inq_vpd->pages[i]) { 1768 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1769 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1770 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1771 (void **) &inq_lbp, errp); 1772 if (inq_task == NULL) { 1773 ret = -EINVAL; 1774 goto out; 1775 } 1776 memcpy(&iscsilun->lbp, inq_lbp, 1777 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1778 scsi_free_scsi_task(inq_task); 1779 break; 1780 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1781 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1782 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1783 (void **) &inq_bl, errp); 1784 if (inq_task == NULL) { 1785 ret = -EINVAL; 1786 goto out; 1787 } 1788 memcpy(&iscsilun->bl, inq_bl, 1789 sizeof(struct scsi_inquiry_block_limits)); 1790 scsi_free_scsi_task(inq_task); 1791 break; 1792 default: 1793 break; 1794 } 1795 } 1796 scsi_free_scsi_task(task); 1797 task = NULL; 1798 1799 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1800 1801 /* Guess the internal cluster (page) size of the iscsi target by the means 1802 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1803 * reasonable size */ 1804 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1805 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1806 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1807 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1808 if (iscsilun->lbprz) { 1809 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1810 } 1811 } 1812 1813 out: 1814 qemu_opts_del(opts); 1815 g_free(initiator_name); 1816 if (iscsi_url != NULL) { 1817 iscsi_destroy_url(iscsi_url); 1818 } 1819 if (task != NULL) { 1820 scsi_free_scsi_task(task); 1821 } 1822 1823 if (ret) { 1824 if (iscsi != NULL) { 1825 if (iscsi_is_logged_in(iscsi)) { 1826 iscsi_logout_sync(iscsi); 1827 } 1828 iscsi_destroy_context(iscsi); 1829 } 1830 memset(iscsilun, 0, sizeof(IscsiLun)); 1831 } 1832 return ret; 1833 } 1834 1835 static void iscsi_close(BlockDriverState *bs) 1836 { 1837 IscsiLun *iscsilun = bs->opaque; 1838 struct iscsi_context *iscsi = iscsilun->iscsi; 1839 1840 iscsi_detach_aio_context(bs); 1841 if (iscsi_is_logged_in(iscsi)) { 1842 iscsi_logout_sync(iscsi); 1843 } 1844 iscsi_destroy_context(iscsi); 1845 g_free(iscsilun->zeroblock); 1846 iscsi_allocmap_free(iscsilun); 1847 memset(iscsilun, 0, sizeof(IscsiLun)); 1848 } 1849 1850 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1851 { 1852 /* We don't actually refresh here, but just return data queried in 1853 * iscsi_open(): iscsi targets don't change their limits. */ 1854 1855 IscsiLun *iscsilun = bs->opaque; 1856 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 1857 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 1858 1859 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 1860 1861 bs->bl.request_alignment = block_size; 1862 1863 if (iscsilun->bl.max_xfer_len) { 1864 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 1865 } 1866 1867 if (max_xfer_len * block_size < INT_MAX) { 1868 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 1869 } 1870 1871 if (iscsilun->lbp.lbpu) { 1872 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 1873 bs->bl.max_pdiscard = 1874 iscsilun->bl.max_unmap * iscsilun->block_size; 1875 } 1876 bs->bl.pdiscard_alignment = 1877 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1878 } else { 1879 bs->bl.pdiscard_alignment = iscsilun->block_size; 1880 } 1881 1882 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 1883 bs->bl.max_pwrite_zeroes = 1884 iscsilun->bl.max_ws_len * iscsilun->block_size; 1885 } 1886 if (iscsilun->lbp.lbpws) { 1887 bs->bl.pwrite_zeroes_alignment = 1888 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1889 } else { 1890 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 1891 } 1892 if (iscsilun->bl.opt_xfer_len && 1893 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 1894 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 1895 iscsilun->block_size); 1896 } 1897 } 1898 1899 /* Note that this will not re-establish a connection with an iSCSI target - it 1900 * is effectively a NOP. */ 1901 static int iscsi_reopen_prepare(BDRVReopenState *state, 1902 BlockReopenQueue *queue, Error **errp) 1903 { 1904 IscsiLun *iscsilun = state->bs->opaque; 1905 1906 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 1907 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1908 return -EACCES; 1909 } 1910 return 0; 1911 } 1912 1913 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 1914 { 1915 IscsiLun *iscsilun = reopen_state->bs->opaque; 1916 1917 /* the cache.direct status might have changed */ 1918 if (iscsilun->allocmap != NULL) { 1919 iscsi_allocmap_init(iscsilun, reopen_state->flags); 1920 } 1921 } 1922 1923 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1924 { 1925 IscsiLun *iscsilun = bs->opaque; 1926 Error *local_err = NULL; 1927 1928 if (iscsilun->type != TYPE_DISK) { 1929 return -ENOTSUP; 1930 } 1931 1932 iscsi_readcapacity_sync(iscsilun, &local_err); 1933 if (local_err != NULL) { 1934 error_free(local_err); 1935 return -EIO; 1936 } 1937 1938 if (offset > iscsi_getlength(bs)) { 1939 return -EINVAL; 1940 } 1941 1942 if (iscsilun->allocmap != NULL) { 1943 iscsi_allocmap_init(iscsilun, bs->open_flags); 1944 } 1945 1946 return 0; 1947 } 1948 1949 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) 1950 { 1951 int ret = 0; 1952 int64_t total_size = 0; 1953 BlockDriverState *bs; 1954 IscsiLun *iscsilun = NULL; 1955 QDict *bs_options; 1956 1957 bs = bdrv_new(); 1958 1959 /* Read out options */ 1960 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1961 BDRV_SECTOR_SIZE); 1962 bs->opaque = g_new0(struct IscsiLun, 1); 1963 iscsilun = bs->opaque; 1964 1965 bs_options = qdict_new(); 1966 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1967 ret = iscsi_open(bs, bs_options, 0, NULL); 1968 QDECREF(bs_options); 1969 1970 if (ret != 0) { 1971 goto out; 1972 } 1973 iscsi_detach_aio_context(bs); 1974 if (iscsilun->type != TYPE_DISK) { 1975 ret = -ENODEV; 1976 goto out; 1977 } 1978 if (bs->total_sectors < total_size) { 1979 ret = -ENOSPC; 1980 goto out; 1981 } 1982 1983 ret = 0; 1984 out: 1985 if (iscsilun->iscsi != NULL) { 1986 iscsi_destroy_context(iscsilun->iscsi); 1987 } 1988 g_free(bs->opaque); 1989 bs->opaque = NULL; 1990 bdrv_unref(bs); 1991 return ret; 1992 } 1993 1994 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1995 { 1996 IscsiLun *iscsilun = bs->opaque; 1997 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 1998 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1999 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 2000 return 0; 2001 } 2002 2003 static void iscsi_invalidate_cache(BlockDriverState *bs, 2004 Error **errp) 2005 { 2006 IscsiLun *iscsilun = bs->opaque; 2007 iscsi_allocmap_invalidate(iscsilun); 2008 } 2009 2010 static QemuOptsList iscsi_create_opts = { 2011 .name = "iscsi-create-opts", 2012 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 2013 .desc = { 2014 { 2015 .name = BLOCK_OPT_SIZE, 2016 .type = QEMU_OPT_SIZE, 2017 .help = "Virtual disk size" 2018 }, 2019 { /* end of list */ } 2020 } 2021 }; 2022 2023 static BlockDriver bdrv_iscsi = { 2024 .format_name = "iscsi", 2025 .protocol_name = "iscsi", 2026 2027 .instance_size = sizeof(IscsiLun), 2028 .bdrv_needs_filename = true, 2029 .bdrv_file_open = iscsi_open, 2030 .bdrv_close = iscsi_close, 2031 .bdrv_create = iscsi_create, 2032 .create_opts = &iscsi_create_opts, 2033 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2034 .bdrv_reopen_commit = iscsi_reopen_commit, 2035 .bdrv_invalidate_cache = iscsi_invalidate_cache, 2036 2037 .bdrv_getlength = iscsi_getlength, 2038 .bdrv_get_info = iscsi_get_info, 2039 .bdrv_truncate = iscsi_truncate, 2040 .bdrv_refresh_limits = iscsi_refresh_limits, 2041 2042 .bdrv_co_get_block_status = iscsi_co_get_block_status, 2043 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2044 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2045 .bdrv_co_readv = iscsi_co_readv, 2046 .bdrv_co_writev_flags = iscsi_co_writev_flags, 2047 .bdrv_co_flush_to_disk = iscsi_co_flush, 2048 2049 #ifdef __linux__ 2050 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2051 #endif 2052 2053 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2054 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2055 }; 2056 2057 #if LIBISCSI_API_VERSION >= (20160603) 2058 static BlockDriver bdrv_iser = { 2059 .format_name = "iser", 2060 .protocol_name = "iser", 2061 2062 .instance_size = sizeof(IscsiLun), 2063 .bdrv_needs_filename = true, 2064 .bdrv_file_open = iscsi_open, 2065 .bdrv_close = iscsi_close, 2066 .bdrv_create = iscsi_create, 2067 .create_opts = &iscsi_create_opts, 2068 .bdrv_reopen_prepare = iscsi_reopen_prepare, 2069 .bdrv_reopen_commit = iscsi_reopen_commit, 2070 .bdrv_invalidate_cache = iscsi_invalidate_cache, 2071 2072 .bdrv_getlength = iscsi_getlength, 2073 .bdrv_get_info = iscsi_get_info, 2074 .bdrv_truncate = iscsi_truncate, 2075 .bdrv_refresh_limits = iscsi_refresh_limits, 2076 2077 .bdrv_co_get_block_status = iscsi_co_get_block_status, 2078 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2079 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2080 .bdrv_co_readv = iscsi_co_readv, 2081 .bdrv_co_writev_flags = iscsi_co_writev_flags, 2082 .bdrv_co_flush_to_disk = iscsi_co_flush, 2083 2084 #ifdef __linux__ 2085 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2086 #endif 2087 2088 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2089 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2090 }; 2091 #endif 2092 2093 static void iscsi_block_init(void) 2094 { 2095 bdrv_register(&bdrv_iscsi); 2096 #if LIBISCSI_API_VERSION >= (20160603) 2097 bdrv_register(&bdrv_iser); 2098 #endif 2099 } 2100 2101 block_init(iscsi_block_init); 2102