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 static int iscsi_translate_sense(struct scsi_sense *sense) 206 { 207 int ret; 208 209 switch (sense->key) { 210 case SCSI_SENSE_NOT_READY: 211 return -EBUSY; 212 case SCSI_SENSE_DATA_PROTECTION: 213 return -EACCES; 214 case SCSI_SENSE_COMMAND_ABORTED: 215 return -ECANCELED; 216 case SCSI_SENSE_ILLEGAL_REQUEST: 217 /* Parse ASCQ */ 218 break; 219 default: 220 return -EIO; 221 } 222 switch (sense->ascq) { 223 case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR: 224 case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE: 225 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB: 226 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST: 227 ret = -EINVAL; 228 break; 229 case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE: 230 ret = -ENOSPC; 231 break; 232 case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED: 233 ret = -ENOTSUP; 234 break; 235 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT: 236 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED: 237 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN: 238 ret = -ENOMEDIUM; 239 break; 240 case SCSI_SENSE_ASCQ_WRITE_PROTECTED: 241 ret = -EACCES; 242 break; 243 default: 244 ret = -EIO; 245 break; 246 } 247 return ret; 248 } 249 250 static void 251 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 252 void *command_data, void *opaque) 253 { 254 struct IscsiTask *iTask = opaque; 255 struct scsi_task *task = command_data; 256 257 iTask->status = status; 258 iTask->do_retry = 0; 259 iTask->task = task; 260 261 if (status != SCSI_STATUS_GOOD) { 262 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 263 if (status == SCSI_STATUS_CHECK_CONDITION 264 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 265 error_report("iSCSI CheckCondition: %s", 266 iscsi_get_error(iscsi)); 267 iTask->do_retry = 1; 268 goto out; 269 } 270 if (status == SCSI_STATUS_BUSY || 271 status == SCSI_STATUS_TIMEOUT || 272 status == SCSI_STATUS_TASK_SET_FULL) { 273 unsigned retry_time = 274 exp_random(iscsi_retry_times[iTask->retries - 1]); 275 if (status == SCSI_STATUS_TIMEOUT) { 276 /* make sure the request is rescheduled AFTER the 277 * reconnect is initiated */ 278 retry_time = EVENT_INTERVAL * 2; 279 iTask->iscsilun->request_timed_out = true; 280 } 281 error_report("iSCSI Busy/TaskSetFull/TimeOut" 282 " (retry #%u in %u ms): %s", 283 iTask->retries, retry_time, 284 iscsi_get_error(iscsi)); 285 aio_timer_init(iTask->iscsilun->aio_context, 286 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 287 SCALE_MS, iscsi_retry_timer_expired, iTask); 288 timer_mod(&iTask->retry_timer, 289 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 290 iTask->do_retry = 1; 291 return; 292 } 293 } 294 iTask->err_code = iscsi_translate_sense(&task->sense); 295 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 296 } 297 298 out: 299 if (iTask->co) { 300 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context, 301 iscsi_co_generic_bh_cb, iTask); 302 } else { 303 iTask->complete = 1; 304 } 305 } 306 307 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 308 { 309 *iTask = (struct IscsiTask) { 310 .co = qemu_coroutine_self(), 311 .iscsilun = iscsilun, 312 }; 313 } 314 315 static void 316 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 317 void *private_data) 318 { 319 IscsiAIOCB *acb = private_data; 320 321 acb->status = -ECANCELED; 322 iscsi_schedule_bh(acb); 323 } 324 325 static void 326 iscsi_aio_cancel(BlockAIOCB *blockacb) 327 { 328 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 329 IscsiLun *iscsilun = acb->iscsilun; 330 331 if (acb->status != -EINPROGRESS) { 332 return; 333 } 334 335 /* send a task mgmt call to the target to cancel the task on the target */ 336 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 337 iscsi_abort_task_cb, acb); 338 339 } 340 341 static const AIOCBInfo iscsi_aiocb_info = { 342 .aiocb_size = sizeof(IscsiAIOCB), 343 .cancel_async = iscsi_aio_cancel, 344 }; 345 346 347 static void iscsi_process_read(void *arg); 348 static void iscsi_process_write(void *arg); 349 350 static void 351 iscsi_set_events(IscsiLun *iscsilun) 352 { 353 struct iscsi_context *iscsi = iscsilun->iscsi; 354 int ev = iscsi_which_events(iscsi); 355 356 if (ev != iscsilun->events) { 357 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 358 false, 359 (ev & POLLIN) ? iscsi_process_read : NULL, 360 (ev & POLLOUT) ? iscsi_process_write : NULL, 361 iscsilun); 362 iscsilun->events = ev; 363 } 364 } 365 366 static void iscsi_timed_check_events(void *opaque) 367 { 368 IscsiLun *iscsilun = opaque; 369 370 /* check for timed out requests */ 371 iscsi_service(iscsilun->iscsi, 0); 372 373 if (iscsilun->request_timed_out) { 374 iscsilun->request_timed_out = false; 375 iscsi_reconnect(iscsilun->iscsi); 376 } 377 378 /* newer versions of libiscsi may return zero events. Ensure we are able 379 * to return to service once this situation changes. */ 380 iscsi_set_events(iscsilun); 381 382 timer_mod(iscsilun->event_timer, 383 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 384 } 385 386 static void 387 iscsi_process_read(void *arg) 388 { 389 IscsiLun *iscsilun = arg; 390 struct iscsi_context *iscsi = iscsilun->iscsi; 391 392 iscsi_service(iscsi, POLLIN); 393 iscsi_set_events(iscsilun); 394 } 395 396 static void 397 iscsi_process_write(void *arg) 398 { 399 IscsiLun *iscsilun = arg; 400 struct iscsi_context *iscsi = iscsilun->iscsi; 401 402 iscsi_service(iscsi, POLLOUT); 403 iscsi_set_events(iscsilun); 404 } 405 406 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 407 { 408 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 409 } 410 411 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 412 { 413 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 414 } 415 416 static bool is_byte_request_lun_aligned(int64_t offset, int count, 417 IscsiLun *iscsilun) 418 { 419 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 420 error_report("iSCSI misaligned request: " 421 "iscsilun->block_size %u, offset %" PRIi64 422 ", count %d", 423 iscsilun->block_size, offset, count); 424 return false; 425 } 426 return true; 427 } 428 429 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 430 IscsiLun *iscsilun) 431 { 432 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 433 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 434 nb_sectors << BDRV_SECTOR_BITS, 435 iscsilun); 436 } 437 438 static void iscsi_allocmap_free(IscsiLun *iscsilun) 439 { 440 g_free(iscsilun->allocmap); 441 g_free(iscsilun->allocmap_valid); 442 iscsilun->allocmap = NULL; 443 iscsilun->allocmap_valid = NULL; 444 } 445 446 447 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 448 { 449 iscsi_allocmap_free(iscsilun); 450 451 iscsilun->allocmap_size = 452 DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun), 453 iscsilun->cluster_sectors); 454 455 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 456 if (!iscsilun->allocmap) { 457 return -ENOMEM; 458 } 459 460 if (open_flags & BDRV_O_NOCACHE) { 461 /* in case that cache.direct = on all allocmap entries are 462 * treated as invalid to force a relookup of the block 463 * status on every read request */ 464 return 0; 465 } 466 467 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 468 if (!iscsilun->allocmap_valid) { 469 /* if we are under memory pressure free the allocmap as well */ 470 iscsi_allocmap_free(iscsilun); 471 return -ENOMEM; 472 } 473 474 return 0; 475 } 476 477 static void 478 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num, 479 int nb_sectors, bool allocated, bool valid) 480 { 481 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 482 483 if (iscsilun->allocmap == NULL) { 484 return; 485 } 486 /* expand to entirely contain all affected clusters */ 487 cl_num_expanded = sector_num / iscsilun->cluster_sectors; 488 nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors, 489 iscsilun->cluster_sectors) - cl_num_expanded; 490 /* shrink to touch only completely contained clusters */ 491 cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 492 nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors 493 - cl_num_shrunk; 494 if (allocated) { 495 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 496 } else { 497 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 498 } 499 500 if (iscsilun->allocmap_valid == NULL) { 501 return; 502 } 503 if (valid) { 504 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 505 } else { 506 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 507 nb_cls_expanded); 508 } 509 } 510 511 static void 512 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num, 513 int nb_sectors) 514 { 515 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true); 516 } 517 518 static void 519 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num, 520 int nb_sectors) 521 { 522 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 523 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 524 */ 525 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true); 526 } 527 528 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num, 529 int nb_sectors) 530 { 531 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false); 532 } 533 534 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 535 { 536 if (iscsilun->allocmap) { 537 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 538 } 539 if (iscsilun->allocmap_valid) { 540 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 541 } 542 } 543 544 static inline bool 545 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num, 546 int nb_sectors) 547 { 548 unsigned long size; 549 if (iscsilun->allocmap == NULL) { 550 return true; 551 } 552 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 553 return !(find_next_bit(iscsilun->allocmap, size, 554 sector_num / iscsilun->cluster_sectors) == size); 555 } 556 557 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 558 int64_t sector_num, int nb_sectors) 559 { 560 unsigned long size; 561 if (iscsilun->allocmap_valid == NULL) { 562 return false; 563 } 564 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 565 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 566 sector_num / iscsilun->cluster_sectors) == size); 567 } 568 569 static int coroutine_fn 570 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 571 QEMUIOVector *iov, int flags) 572 { 573 IscsiLun *iscsilun = bs->opaque; 574 struct IscsiTask iTask; 575 uint64_t lba; 576 uint32_t num_sectors; 577 bool fua = flags & BDRV_REQ_FUA; 578 579 if (fua) { 580 assert(iscsilun->dpofua); 581 } 582 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 583 return -EINVAL; 584 } 585 586 if (bs->bl.max_transfer) { 587 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 588 } 589 590 lba = sector_qemu2lun(sector_num, iscsilun); 591 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 592 iscsi_co_init_iscsitask(iscsilun, &iTask); 593 retry: 594 if (iscsilun->use_16_for_rw) { 595 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 596 NULL, num_sectors * iscsilun->block_size, 597 iscsilun->block_size, 0, 0, fua, 0, 0, 598 iscsi_co_generic_cb, &iTask); 599 } else { 600 iTask.task = iscsi_write10_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 } 605 if (iTask.task == NULL) { 606 return -ENOMEM; 607 } 608 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 609 iov->niov); 610 while (!iTask.complete) { 611 iscsi_set_events(iscsilun); 612 qemu_coroutine_yield(); 613 } 614 615 if (iTask.task != NULL) { 616 scsi_free_scsi_task(iTask.task); 617 iTask.task = NULL; 618 } 619 620 if (iTask.do_retry) { 621 iTask.complete = 0; 622 goto retry; 623 } 624 625 if (iTask.status != SCSI_STATUS_GOOD) { 626 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors); 627 return iTask.err_code; 628 } 629 630 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors); 631 632 return 0; 633 } 634 635 636 637 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 638 int64_t sector_num, 639 int nb_sectors, int *pnum, 640 BlockDriverState **file) 641 { 642 IscsiLun *iscsilun = bs->opaque; 643 struct scsi_get_lba_status *lbas = NULL; 644 struct scsi_lba_status_descriptor *lbasd = NULL; 645 struct IscsiTask iTask; 646 int64_t ret; 647 648 iscsi_co_init_iscsitask(iscsilun, &iTask); 649 650 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 651 ret = -EINVAL; 652 goto out; 653 } 654 655 /* default to all sectors allocated */ 656 ret = BDRV_BLOCK_DATA; 657 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 658 *pnum = nb_sectors; 659 660 /* LUN does not support logical block provisioning */ 661 if (!iscsilun->lbpme) { 662 goto out; 663 } 664 665 retry: 666 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 667 sector_qemu2lun(sector_num, iscsilun), 668 8 + 16, iscsi_co_generic_cb, 669 &iTask) == NULL) { 670 ret = -ENOMEM; 671 goto out; 672 } 673 674 while (!iTask.complete) { 675 iscsi_set_events(iscsilun); 676 qemu_coroutine_yield(); 677 } 678 679 if (iTask.do_retry) { 680 if (iTask.task != NULL) { 681 scsi_free_scsi_task(iTask.task); 682 iTask.task = NULL; 683 } 684 iTask.complete = 0; 685 goto retry; 686 } 687 688 if (iTask.status != SCSI_STATUS_GOOD) { 689 /* in case the get_lba_status_callout fails (i.e. 690 * because the device is busy or the cmd is not 691 * supported) we pretend all blocks are allocated 692 * for backwards compatibility */ 693 goto out; 694 } 695 696 lbas = scsi_datain_unmarshall(iTask.task); 697 if (lbas == NULL) { 698 ret = -EIO; 699 goto out; 700 } 701 702 lbasd = &lbas->descriptors[0]; 703 704 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 705 ret = -EIO; 706 goto out; 707 } 708 709 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 710 711 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 712 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 713 ret &= ~BDRV_BLOCK_DATA; 714 if (iscsilun->lbprz) { 715 ret |= BDRV_BLOCK_ZERO; 716 } 717 } 718 719 if (ret & BDRV_BLOCK_ZERO) { 720 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum); 721 } else { 722 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum); 723 } 724 725 if (*pnum > nb_sectors) { 726 *pnum = nb_sectors; 727 } 728 out: 729 if (iTask.task != NULL) { 730 scsi_free_scsi_task(iTask.task); 731 } 732 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) { 733 *file = bs; 734 } 735 return ret; 736 } 737 738 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 739 int64_t sector_num, int nb_sectors, 740 QEMUIOVector *iov) 741 { 742 IscsiLun *iscsilun = bs->opaque; 743 struct IscsiTask iTask; 744 uint64_t lba; 745 uint32_t num_sectors; 746 747 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 748 return -EINVAL; 749 } 750 751 if (bs->bl.max_transfer) { 752 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 753 } 754 755 /* if cache.direct is off and we have a valid entry in our allocation map 756 * we can skip checking the block status and directly return zeroes if 757 * the request falls within an unallocated area */ 758 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 759 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 760 qemu_iovec_memset(iov, 0, 0x00, iov->size); 761 return 0; 762 } 763 764 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 765 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 766 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 767 int pnum; 768 BlockDriverState *file; 769 /* check the block status from the beginning of the cluster 770 * containing the start sector */ 771 int64_t ret = iscsi_co_get_block_status(bs, 772 sector_num - sector_num % iscsilun->cluster_sectors, 773 BDRV_REQUEST_MAX_SECTORS, &pnum, &file); 774 if (ret < 0) { 775 return ret; 776 } 777 /* if the whole request falls into an unallocated area we can avoid 778 * to read and directly return zeroes instead */ 779 if (ret & BDRV_BLOCK_ZERO && 780 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) { 781 qemu_iovec_memset(iov, 0, 0x00, iov->size); 782 return 0; 783 } 784 } 785 786 lba = sector_qemu2lun(sector_num, iscsilun); 787 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 788 789 iscsi_co_init_iscsitask(iscsilun, &iTask); 790 retry: 791 if (iscsilun->use_16_for_rw) { 792 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 793 num_sectors * iscsilun->block_size, 794 iscsilun->block_size, 0, 0, 0, 0, 0, 795 iscsi_co_generic_cb, &iTask); 796 } else { 797 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 798 num_sectors * iscsilun->block_size, 799 iscsilun->block_size, 800 0, 0, 0, 0, 0, 801 iscsi_co_generic_cb, &iTask); 802 } 803 if (iTask.task == NULL) { 804 return -ENOMEM; 805 } 806 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 807 808 while (!iTask.complete) { 809 iscsi_set_events(iscsilun); 810 qemu_coroutine_yield(); 811 } 812 813 if (iTask.task != NULL) { 814 scsi_free_scsi_task(iTask.task); 815 iTask.task = NULL; 816 } 817 818 if (iTask.do_retry) { 819 iTask.complete = 0; 820 goto retry; 821 } 822 823 if (iTask.status != SCSI_STATUS_GOOD) { 824 return iTask.err_code; 825 } 826 827 return 0; 828 } 829 830 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 831 { 832 IscsiLun *iscsilun = bs->opaque; 833 struct IscsiTask iTask; 834 835 iscsi_co_init_iscsitask(iscsilun, &iTask); 836 retry: 837 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 838 0, iscsi_co_generic_cb, &iTask) == NULL) { 839 return -ENOMEM; 840 } 841 842 while (!iTask.complete) { 843 iscsi_set_events(iscsilun); 844 qemu_coroutine_yield(); 845 } 846 847 if (iTask.task != NULL) { 848 scsi_free_scsi_task(iTask.task); 849 iTask.task = NULL; 850 } 851 852 if (iTask.do_retry) { 853 iTask.complete = 0; 854 goto retry; 855 } 856 857 if (iTask.status != SCSI_STATUS_GOOD) { 858 return iTask.err_code; 859 } 860 861 return 0; 862 } 863 864 #ifdef __linux__ 865 static void 866 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 867 void *command_data, void *opaque) 868 { 869 IscsiAIOCB *acb = opaque; 870 871 g_free(acb->buf); 872 acb->buf = NULL; 873 874 acb->status = 0; 875 if (status < 0) { 876 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 877 iscsi_get_error(iscsi)); 878 acb->status = iscsi_translate_sense(&acb->task->sense); 879 } 880 881 acb->ioh->driver_status = 0; 882 acb->ioh->host_status = 0; 883 acb->ioh->resid = 0; 884 acb->ioh->status = status; 885 886 #define SG_ERR_DRIVER_SENSE 0x08 887 888 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 889 int ss; 890 891 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 892 893 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 894 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 895 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 896 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 897 } 898 899 iscsi_schedule_bh(acb); 900 } 901 902 static void iscsi_ioctl_bh_completion(void *opaque) 903 { 904 IscsiAIOCB *acb = opaque; 905 906 qemu_bh_delete(acb->bh); 907 acb->common.cb(acb->common.opaque, acb->ret); 908 qemu_aio_unref(acb); 909 } 910 911 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 912 { 913 BlockDriverState *bs = acb->common.bs; 914 IscsiLun *iscsilun = bs->opaque; 915 int ret = 0; 916 917 switch (req) { 918 case SG_GET_VERSION_NUM: 919 *(int *)buf = 30000; 920 break; 921 case SG_GET_SCSI_ID: 922 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 923 break; 924 default: 925 ret = -EINVAL; 926 } 927 assert(!acb->bh); 928 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 929 iscsi_ioctl_bh_completion, acb); 930 acb->ret = ret; 931 qemu_bh_schedule(acb->bh); 932 } 933 934 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 935 unsigned long int req, void *buf, 936 BlockCompletionFunc *cb, void *opaque) 937 { 938 IscsiLun *iscsilun = bs->opaque; 939 struct iscsi_context *iscsi = iscsilun->iscsi; 940 struct iscsi_data data; 941 IscsiAIOCB *acb; 942 943 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 944 945 acb->iscsilun = iscsilun; 946 acb->bh = NULL; 947 acb->status = -EINPROGRESS; 948 acb->buf = NULL; 949 acb->ioh = buf; 950 951 if (req != SG_IO) { 952 iscsi_ioctl_handle_emulated(acb, req, buf); 953 return &acb->common; 954 } 955 956 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 957 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 958 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 959 qemu_aio_unref(acb); 960 return NULL; 961 } 962 963 acb->task = malloc(sizeof(struct scsi_task)); 964 if (acb->task == NULL) { 965 error_report("iSCSI: Failed to allocate task for scsi command. %s", 966 iscsi_get_error(iscsi)); 967 qemu_aio_unref(acb); 968 return NULL; 969 } 970 memset(acb->task, 0, sizeof(struct scsi_task)); 971 972 switch (acb->ioh->dxfer_direction) { 973 case SG_DXFER_TO_DEV: 974 acb->task->xfer_dir = SCSI_XFER_WRITE; 975 break; 976 case SG_DXFER_FROM_DEV: 977 acb->task->xfer_dir = SCSI_XFER_READ; 978 break; 979 default: 980 acb->task->xfer_dir = SCSI_XFER_NONE; 981 break; 982 } 983 984 acb->task->cdb_size = acb->ioh->cmd_len; 985 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 986 acb->task->expxferlen = acb->ioh->dxfer_len; 987 988 data.size = 0; 989 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 990 if (acb->ioh->iovec_count == 0) { 991 data.data = acb->ioh->dxferp; 992 data.size = acb->ioh->dxfer_len; 993 } else { 994 scsi_task_set_iov_out(acb->task, 995 (struct scsi_iovec *) acb->ioh->dxferp, 996 acb->ioh->iovec_count); 997 } 998 } 999 1000 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1001 iscsi_aio_ioctl_cb, 1002 (data.size > 0) ? &data : NULL, 1003 acb) != 0) { 1004 scsi_free_scsi_task(acb->task); 1005 qemu_aio_unref(acb); 1006 return NULL; 1007 } 1008 1009 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1010 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1011 if (acb->ioh->iovec_count == 0) { 1012 scsi_task_add_data_in_buffer(acb->task, 1013 acb->ioh->dxfer_len, 1014 acb->ioh->dxferp); 1015 } else { 1016 scsi_task_set_iov_in(acb->task, 1017 (struct scsi_iovec *) acb->ioh->dxferp, 1018 acb->ioh->iovec_count); 1019 } 1020 } 1021 1022 iscsi_set_events(iscsilun); 1023 1024 return &acb->common; 1025 } 1026 1027 #endif 1028 1029 static int64_t 1030 iscsi_getlength(BlockDriverState *bs) 1031 { 1032 IscsiLun *iscsilun = bs->opaque; 1033 int64_t len; 1034 1035 len = iscsilun->num_blocks; 1036 len *= iscsilun->block_size; 1037 1038 return len; 1039 } 1040 1041 static int 1042 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int count) 1043 { 1044 IscsiLun *iscsilun = bs->opaque; 1045 struct IscsiTask iTask; 1046 struct unmap_list list; 1047 1048 assert(is_byte_request_lun_aligned(offset, count, iscsilun)); 1049 1050 if (!iscsilun->lbp.lbpu) { 1051 /* UNMAP is not supported by the target */ 1052 return 0; 1053 } 1054 1055 list.lba = offset / iscsilun->block_size; 1056 list.num = count / iscsilun->block_size; 1057 1058 iscsi_co_init_iscsitask(iscsilun, &iTask); 1059 retry: 1060 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1061 iscsi_co_generic_cb, &iTask) == NULL) { 1062 return -ENOMEM; 1063 } 1064 1065 while (!iTask.complete) { 1066 iscsi_set_events(iscsilun); 1067 qemu_coroutine_yield(); 1068 } 1069 1070 if (iTask.task != NULL) { 1071 scsi_free_scsi_task(iTask.task); 1072 iTask.task = NULL; 1073 } 1074 1075 if (iTask.do_retry) { 1076 iTask.complete = 0; 1077 goto retry; 1078 } 1079 1080 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1081 /* the target might fail with a check condition if it 1082 is not happy with the alignment of the UNMAP request 1083 we silently fail in this case */ 1084 return 0; 1085 } 1086 1087 if (iTask.status != SCSI_STATUS_GOOD) { 1088 return iTask.err_code; 1089 } 1090 1091 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1092 count >> BDRV_SECTOR_BITS); 1093 1094 return 0; 1095 } 1096 1097 static int 1098 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1099 int count, BdrvRequestFlags flags) 1100 { 1101 IscsiLun *iscsilun = bs->opaque; 1102 struct IscsiTask iTask; 1103 uint64_t lba; 1104 uint32_t nb_blocks; 1105 bool use_16_for_ws = iscsilun->use_16_for_rw; 1106 1107 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) { 1108 return -ENOTSUP; 1109 } 1110 1111 if (flags & BDRV_REQ_MAY_UNMAP) { 1112 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1113 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1114 use_16_for_ws = true; 1115 } 1116 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1117 /* WRITESAME16 with UNMAP is not supported by the target, 1118 * fall back and try WRITESAME10/16 without UNMAP */ 1119 flags &= ~BDRV_REQ_MAY_UNMAP; 1120 use_16_for_ws = iscsilun->use_16_for_rw; 1121 } 1122 } 1123 1124 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1125 /* WRITESAME without UNMAP is not supported by the target */ 1126 return -ENOTSUP; 1127 } 1128 1129 lba = offset / iscsilun->block_size; 1130 nb_blocks = count / iscsilun->block_size; 1131 1132 if (iscsilun->zeroblock == NULL) { 1133 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1134 if (iscsilun->zeroblock == NULL) { 1135 return -ENOMEM; 1136 } 1137 } 1138 1139 iscsi_co_init_iscsitask(iscsilun, &iTask); 1140 retry: 1141 if (use_16_for_ws) { 1142 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1143 iscsilun->zeroblock, iscsilun->block_size, 1144 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1145 0, 0, iscsi_co_generic_cb, &iTask); 1146 } else { 1147 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1148 iscsilun->zeroblock, iscsilun->block_size, 1149 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1150 0, 0, iscsi_co_generic_cb, &iTask); 1151 } 1152 if (iTask.task == NULL) { 1153 return -ENOMEM; 1154 } 1155 1156 while (!iTask.complete) { 1157 iscsi_set_events(iscsilun); 1158 qemu_coroutine_yield(); 1159 } 1160 1161 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1162 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1163 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1164 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1165 /* WRITE SAME is not supported by the target */ 1166 iscsilun->has_write_same = false; 1167 scsi_free_scsi_task(iTask.task); 1168 return -ENOTSUP; 1169 } 1170 1171 if (iTask.task != NULL) { 1172 scsi_free_scsi_task(iTask.task); 1173 iTask.task = NULL; 1174 } 1175 1176 if (iTask.do_retry) { 1177 iTask.complete = 0; 1178 goto retry; 1179 } 1180 1181 if (iTask.status != SCSI_STATUS_GOOD) { 1182 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1183 count >> BDRV_SECTOR_BITS); 1184 return iTask.err_code; 1185 } 1186 1187 if (flags & BDRV_REQ_MAY_UNMAP) { 1188 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1189 count >> BDRV_SECTOR_BITS); 1190 } else { 1191 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS, 1192 count >> BDRV_SECTOR_BITS); 1193 } 1194 1195 return 0; 1196 } 1197 1198 static void parse_chap(struct iscsi_context *iscsi, const char *target, 1199 Error **errp) 1200 { 1201 QemuOptsList *list; 1202 QemuOpts *opts; 1203 const char *user = NULL; 1204 const char *password = NULL; 1205 const char *secretid; 1206 char *secret = NULL; 1207 1208 list = qemu_find_opts("iscsi"); 1209 if (!list) { 1210 return; 1211 } 1212 1213 opts = qemu_opts_find(list, target); 1214 if (opts == NULL) { 1215 opts = QTAILQ_FIRST(&list->head); 1216 if (!opts) { 1217 return; 1218 } 1219 } 1220 1221 user = qemu_opt_get(opts, "user"); 1222 if (!user) { 1223 return; 1224 } 1225 1226 secretid = qemu_opt_get(opts, "password-secret"); 1227 password = qemu_opt_get(opts, "password"); 1228 if (secretid && password) { 1229 error_setg(errp, "'password' and 'password-secret' properties are " 1230 "mutually exclusive"); 1231 return; 1232 } 1233 if (secretid) { 1234 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1235 if (!secret) { 1236 return; 1237 } 1238 password = secret; 1239 } else if (!password) { 1240 error_setg(errp, "CHAP username specified but no password was given"); 1241 return; 1242 } 1243 1244 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1245 error_setg(errp, "Failed to set initiator username and password"); 1246 } 1247 1248 g_free(secret); 1249 } 1250 1251 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 1252 Error **errp) 1253 { 1254 QemuOptsList *list; 1255 QemuOpts *opts; 1256 const char *digest = NULL; 1257 1258 list = qemu_find_opts("iscsi"); 1259 if (!list) { 1260 return; 1261 } 1262 1263 opts = qemu_opts_find(list, target); 1264 if (opts == NULL) { 1265 opts = QTAILQ_FIRST(&list->head); 1266 if (!opts) { 1267 return; 1268 } 1269 } 1270 1271 digest = qemu_opt_get(opts, "header-digest"); 1272 if (!digest) { 1273 return; 1274 } 1275 1276 if (!strcmp(digest, "CRC32C")) { 1277 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1278 } else if (!strcmp(digest, "NONE")) { 1279 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1280 } else if (!strcmp(digest, "CRC32C-NONE")) { 1281 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1282 } else if (!strcmp(digest, "NONE-CRC32C")) { 1283 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1284 } else { 1285 error_setg(errp, "Invalid header-digest setting : %s", digest); 1286 } 1287 } 1288 1289 static char *parse_initiator_name(const char *target) 1290 { 1291 QemuOptsList *list; 1292 QemuOpts *opts; 1293 const char *name; 1294 char *iscsi_name; 1295 UuidInfo *uuid_info; 1296 1297 list = qemu_find_opts("iscsi"); 1298 if (list) { 1299 opts = qemu_opts_find(list, target); 1300 if (!opts) { 1301 opts = QTAILQ_FIRST(&list->head); 1302 } 1303 if (opts) { 1304 name = qemu_opt_get(opts, "initiator-name"); 1305 if (name) { 1306 return g_strdup(name); 1307 } 1308 } 1309 } 1310 1311 uuid_info = qmp_query_uuid(NULL); 1312 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1313 name = qemu_get_vm_name(); 1314 } else { 1315 name = uuid_info->UUID; 1316 } 1317 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1318 name ? ":" : "", name ? name : ""); 1319 qapi_free_UuidInfo(uuid_info); 1320 return iscsi_name; 1321 } 1322 1323 static int parse_timeout(const char *target) 1324 { 1325 QemuOptsList *list; 1326 QemuOpts *opts; 1327 const char *timeout; 1328 1329 list = qemu_find_opts("iscsi"); 1330 if (list) { 1331 opts = qemu_opts_find(list, target); 1332 if (!opts) { 1333 opts = QTAILQ_FIRST(&list->head); 1334 } 1335 if (opts) { 1336 timeout = qemu_opt_get(opts, "timeout"); 1337 if (timeout) { 1338 return atoi(timeout); 1339 } 1340 } 1341 } 1342 1343 return 0; 1344 } 1345 1346 static void iscsi_nop_timed_event(void *opaque) 1347 { 1348 IscsiLun *iscsilun = opaque; 1349 1350 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1351 error_report("iSCSI: NOP timeout. Reconnecting..."); 1352 iscsilun->request_timed_out = true; 1353 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1354 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1355 return; 1356 } 1357 1358 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1359 iscsi_set_events(iscsilun); 1360 } 1361 1362 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1363 { 1364 struct scsi_task *task = NULL; 1365 struct scsi_readcapacity10 *rc10 = NULL; 1366 struct scsi_readcapacity16 *rc16 = NULL; 1367 int retries = ISCSI_CMD_RETRIES; 1368 1369 do { 1370 if (task != NULL) { 1371 scsi_free_scsi_task(task); 1372 task = NULL; 1373 } 1374 1375 switch (iscsilun->type) { 1376 case TYPE_DISK: 1377 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1378 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1379 rc16 = scsi_datain_unmarshall(task); 1380 if (rc16 == NULL) { 1381 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1382 } else { 1383 iscsilun->block_size = rc16->block_length; 1384 iscsilun->num_blocks = rc16->returned_lba + 1; 1385 iscsilun->lbpme = !!rc16->lbpme; 1386 iscsilun->lbprz = !!rc16->lbprz; 1387 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1388 } 1389 break; 1390 } 1391 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1392 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1393 break; 1394 } 1395 /* Fall through and try READ CAPACITY(10) instead. */ 1396 case TYPE_ROM: 1397 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1398 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1399 rc10 = scsi_datain_unmarshall(task); 1400 if (rc10 == NULL) { 1401 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1402 } else { 1403 iscsilun->block_size = rc10->block_size; 1404 if (rc10->lba == 0) { 1405 /* blank disk loaded */ 1406 iscsilun->num_blocks = 0; 1407 } else { 1408 iscsilun->num_blocks = rc10->lba + 1; 1409 } 1410 } 1411 } 1412 break; 1413 default: 1414 return; 1415 } 1416 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1417 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1418 && retries-- > 0); 1419 1420 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1421 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1422 } else if (!iscsilun->block_size || 1423 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1424 error_setg(errp, "iSCSI: the target returned an invalid " 1425 "block size of %d.", iscsilun->block_size); 1426 } 1427 if (task) { 1428 scsi_free_scsi_task(task); 1429 } 1430 } 1431 1432 /* TODO Convert to fine grained options */ 1433 static QemuOptsList runtime_opts = { 1434 .name = "iscsi", 1435 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1436 .desc = { 1437 { 1438 .name = "filename", 1439 .type = QEMU_OPT_STRING, 1440 .help = "URL to the iscsi image", 1441 }, 1442 { /* end of list */ } 1443 }, 1444 }; 1445 1446 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1447 int evpd, int pc, void **inq, Error **errp) 1448 { 1449 int full_size; 1450 struct scsi_task *task = NULL; 1451 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1452 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1453 goto fail; 1454 } 1455 full_size = scsi_datain_getfullsize(task); 1456 if (full_size > task->datain.size) { 1457 scsi_free_scsi_task(task); 1458 1459 /* we need more data for the full list */ 1460 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1461 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1462 goto fail; 1463 } 1464 } 1465 1466 *inq = scsi_datain_unmarshall(task); 1467 if (*inq == NULL) { 1468 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1469 goto fail_with_err; 1470 } 1471 1472 return task; 1473 1474 fail: 1475 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1476 iscsi_get_error(iscsi)); 1477 fail_with_err: 1478 if (task != NULL) { 1479 scsi_free_scsi_task(task); 1480 } 1481 return NULL; 1482 } 1483 1484 static void iscsi_detach_aio_context(BlockDriverState *bs) 1485 { 1486 IscsiLun *iscsilun = bs->opaque; 1487 1488 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1489 false, NULL, NULL, NULL); 1490 iscsilun->events = 0; 1491 1492 if (iscsilun->nop_timer) { 1493 timer_del(iscsilun->nop_timer); 1494 timer_free(iscsilun->nop_timer); 1495 iscsilun->nop_timer = NULL; 1496 } 1497 if (iscsilun->event_timer) { 1498 timer_del(iscsilun->event_timer); 1499 timer_free(iscsilun->event_timer); 1500 iscsilun->event_timer = NULL; 1501 } 1502 } 1503 1504 static void iscsi_attach_aio_context(BlockDriverState *bs, 1505 AioContext *new_context) 1506 { 1507 IscsiLun *iscsilun = bs->opaque; 1508 1509 iscsilun->aio_context = new_context; 1510 iscsi_set_events(iscsilun); 1511 1512 /* Set up a timer for sending out iSCSI NOPs */ 1513 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1514 QEMU_CLOCK_REALTIME, SCALE_MS, 1515 iscsi_nop_timed_event, iscsilun); 1516 timer_mod(iscsilun->nop_timer, 1517 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1518 1519 /* Set up a timer for periodic calls to iscsi_set_events and to 1520 * scan for command timeout */ 1521 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1522 QEMU_CLOCK_REALTIME, SCALE_MS, 1523 iscsi_timed_check_events, iscsilun); 1524 timer_mod(iscsilun->event_timer, 1525 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1526 } 1527 1528 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1529 { 1530 struct scsi_task *task; 1531 struct scsi_mode_sense *ms = NULL; 1532 iscsilun->write_protected = false; 1533 iscsilun->dpofua = false; 1534 1535 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1536 1, SCSI_MODESENSE_PC_CURRENT, 1537 0x3F, 0, 255); 1538 if (task == NULL) { 1539 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1540 iscsi_get_error(iscsilun->iscsi)); 1541 goto out; 1542 } 1543 1544 if (task->status != SCSI_STATUS_GOOD) { 1545 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1546 goto out; 1547 } 1548 ms = scsi_datain_unmarshall(task); 1549 if (!ms) { 1550 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1551 iscsi_get_error(iscsilun->iscsi)); 1552 goto out; 1553 } 1554 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1555 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1556 1557 out: 1558 if (task) { 1559 scsi_free_scsi_task(task); 1560 } 1561 } 1562 1563 /* 1564 * We support iscsi url's on the form 1565 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1566 */ 1567 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1568 Error **errp) 1569 { 1570 IscsiLun *iscsilun = bs->opaque; 1571 struct iscsi_context *iscsi = NULL; 1572 struct iscsi_url *iscsi_url = NULL; 1573 struct scsi_task *task = NULL; 1574 struct scsi_inquiry_standard *inq = NULL; 1575 struct scsi_inquiry_supported_pages *inq_vpd; 1576 char *initiator_name = NULL; 1577 QemuOpts *opts; 1578 Error *local_err = NULL; 1579 const char *filename; 1580 int i, ret = 0, timeout = 0; 1581 1582 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1583 qemu_opts_absorb_qdict(opts, options, &local_err); 1584 if (local_err) { 1585 error_propagate(errp, local_err); 1586 ret = -EINVAL; 1587 goto out; 1588 } 1589 1590 filename = qemu_opt_get(opts, "filename"); 1591 1592 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1593 if (iscsi_url == NULL) { 1594 error_setg(errp, "Failed to parse URL : %s", filename); 1595 ret = -EINVAL; 1596 goto out; 1597 } 1598 1599 memset(iscsilun, 0, sizeof(IscsiLun)); 1600 1601 initiator_name = parse_initiator_name(iscsi_url->target); 1602 1603 iscsi = iscsi_create_context(initiator_name); 1604 if (iscsi == NULL) { 1605 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1606 ret = -ENOMEM; 1607 goto out; 1608 } 1609 1610 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1611 error_setg(errp, "iSCSI: Failed to set target name."); 1612 ret = -EINVAL; 1613 goto out; 1614 } 1615 1616 if (iscsi_url->user[0] != '\0') { 1617 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1618 iscsi_url->passwd); 1619 if (ret != 0) { 1620 error_setg(errp, "Failed to set initiator username and password"); 1621 ret = -EINVAL; 1622 goto out; 1623 } 1624 } 1625 1626 /* check if we got CHAP username/password via the options */ 1627 parse_chap(iscsi, iscsi_url->target, &local_err); 1628 if (local_err != NULL) { 1629 error_propagate(errp, local_err); 1630 ret = -EINVAL; 1631 goto out; 1632 } 1633 1634 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1635 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1636 ret = -EINVAL; 1637 goto out; 1638 } 1639 1640 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1641 1642 /* check if we got HEADER_DIGEST via the options */ 1643 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1644 if (local_err != NULL) { 1645 error_propagate(errp, local_err); 1646 ret = -EINVAL; 1647 goto out; 1648 } 1649 1650 /* timeout handling is broken in libiscsi before 1.15.0 */ 1651 timeout = parse_timeout(iscsi_url->target); 1652 #if defined(LIBISCSI_API_VERSION) && LIBISCSI_API_VERSION >= 20150621 1653 iscsi_set_timeout(iscsi, timeout); 1654 #else 1655 if (timeout) { 1656 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1657 } 1658 #endif 1659 1660 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1661 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1662 iscsi_get_error(iscsi)); 1663 ret = -EINVAL; 1664 goto out; 1665 } 1666 1667 iscsilun->iscsi = iscsi; 1668 iscsilun->aio_context = bdrv_get_aio_context(bs); 1669 iscsilun->lun = iscsi_url->lun; 1670 iscsilun->has_write_same = true; 1671 1672 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1673 (void **) &inq, errp); 1674 if (task == NULL) { 1675 ret = -EINVAL; 1676 goto out; 1677 } 1678 iscsilun->type = inq->periperal_device_type; 1679 scsi_free_scsi_task(task); 1680 task = NULL; 1681 1682 iscsi_modesense_sync(iscsilun); 1683 if (iscsilun->dpofua) { 1684 bs->supported_write_flags = BDRV_REQ_FUA; 1685 } 1686 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1687 1688 /* Check the write protect flag of the LUN if we want to write */ 1689 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1690 iscsilun->write_protected) { 1691 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1692 ret = -EACCES; 1693 goto out; 1694 } 1695 1696 iscsi_readcapacity_sync(iscsilun, &local_err); 1697 if (local_err != NULL) { 1698 error_propagate(errp, local_err); 1699 ret = -EINVAL; 1700 goto out; 1701 } 1702 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1703 1704 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1705 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1706 * will try to read from the device to guess the image format. 1707 */ 1708 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1709 bs->sg = true; 1710 } 1711 1712 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1713 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1714 (void **) &inq_vpd, errp); 1715 if (task == NULL) { 1716 ret = -EINVAL; 1717 goto out; 1718 } 1719 for (i = 0; i < inq_vpd->num_pages; i++) { 1720 struct scsi_task *inq_task; 1721 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1722 struct scsi_inquiry_block_limits *inq_bl; 1723 switch (inq_vpd->pages[i]) { 1724 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1725 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1726 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1727 (void **) &inq_lbp, errp); 1728 if (inq_task == NULL) { 1729 ret = -EINVAL; 1730 goto out; 1731 } 1732 memcpy(&iscsilun->lbp, inq_lbp, 1733 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1734 scsi_free_scsi_task(inq_task); 1735 break; 1736 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1737 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1738 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1739 (void **) &inq_bl, errp); 1740 if (inq_task == NULL) { 1741 ret = -EINVAL; 1742 goto out; 1743 } 1744 memcpy(&iscsilun->bl, inq_bl, 1745 sizeof(struct scsi_inquiry_block_limits)); 1746 scsi_free_scsi_task(inq_task); 1747 break; 1748 default: 1749 break; 1750 } 1751 } 1752 scsi_free_scsi_task(task); 1753 task = NULL; 1754 1755 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1756 1757 /* Guess the internal cluster (page) size of the iscsi target by the means 1758 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1759 * reasonable size */ 1760 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1761 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1762 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1763 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1764 if (iscsilun->lbprz) { 1765 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1766 } 1767 } 1768 1769 out: 1770 qemu_opts_del(opts); 1771 g_free(initiator_name); 1772 if (iscsi_url != NULL) { 1773 iscsi_destroy_url(iscsi_url); 1774 } 1775 if (task != NULL) { 1776 scsi_free_scsi_task(task); 1777 } 1778 1779 if (ret) { 1780 if (iscsi != NULL) { 1781 if (iscsi_is_logged_in(iscsi)) { 1782 iscsi_logout_sync(iscsi); 1783 } 1784 iscsi_destroy_context(iscsi); 1785 } 1786 memset(iscsilun, 0, sizeof(IscsiLun)); 1787 } 1788 return ret; 1789 } 1790 1791 static void iscsi_close(BlockDriverState *bs) 1792 { 1793 IscsiLun *iscsilun = bs->opaque; 1794 struct iscsi_context *iscsi = iscsilun->iscsi; 1795 1796 iscsi_detach_aio_context(bs); 1797 if (iscsi_is_logged_in(iscsi)) { 1798 iscsi_logout_sync(iscsi); 1799 } 1800 iscsi_destroy_context(iscsi); 1801 g_free(iscsilun->zeroblock); 1802 iscsi_allocmap_free(iscsilun); 1803 memset(iscsilun, 0, sizeof(IscsiLun)); 1804 } 1805 1806 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1807 { 1808 /* We don't actually refresh here, but just return data queried in 1809 * iscsi_open(): iscsi targets don't change their limits. */ 1810 1811 IscsiLun *iscsilun = bs->opaque; 1812 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 1813 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size); 1814 1815 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg); 1816 1817 bs->bl.request_alignment = block_size; 1818 1819 if (iscsilun->bl.max_xfer_len) { 1820 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len); 1821 } 1822 1823 if (max_xfer_len * block_size < INT_MAX) { 1824 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size; 1825 } 1826 1827 if (iscsilun->lbp.lbpu) { 1828 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) { 1829 bs->bl.max_pdiscard = 1830 iscsilun->bl.max_unmap * iscsilun->block_size; 1831 } 1832 bs->bl.pdiscard_alignment = 1833 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1834 } else { 1835 bs->bl.pdiscard_alignment = iscsilun->block_size; 1836 } 1837 1838 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) { 1839 bs->bl.max_pwrite_zeroes = 1840 iscsilun->bl.max_ws_len * iscsilun->block_size; 1841 } 1842 if (iscsilun->lbp.lbpws) { 1843 bs->bl.pwrite_zeroes_alignment = 1844 iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1845 } else { 1846 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size; 1847 } 1848 if (iscsilun->bl.opt_xfer_len && 1849 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) { 1850 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len * 1851 iscsilun->block_size); 1852 } 1853 } 1854 1855 /* Note that this will not re-establish a connection with an iSCSI target - it 1856 * is effectively a NOP. */ 1857 static int iscsi_reopen_prepare(BDRVReopenState *state, 1858 BlockReopenQueue *queue, Error **errp) 1859 { 1860 IscsiLun *iscsilun = state->bs->opaque; 1861 1862 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) { 1863 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1864 return -EACCES; 1865 } 1866 return 0; 1867 } 1868 1869 static void iscsi_reopen_commit(BDRVReopenState *reopen_state) 1870 { 1871 IscsiLun *iscsilun = reopen_state->bs->opaque; 1872 1873 /* the cache.direct status might have changed */ 1874 if (iscsilun->allocmap != NULL) { 1875 iscsi_allocmap_init(iscsilun, reopen_state->flags); 1876 } 1877 } 1878 1879 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1880 { 1881 IscsiLun *iscsilun = bs->opaque; 1882 Error *local_err = NULL; 1883 1884 if (iscsilun->type != TYPE_DISK) { 1885 return -ENOTSUP; 1886 } 1887 1888 iscsi_readcapacity_sync(iscsilun, &local_err); 1889 if (local_err != NULL) { 1890 error_free(local_err); 1891 return -EIO; 1892 } 1893 1894 if (offset > iscsi_getlength(bs)) { 1895 return -EINVAL; 1896 } 1897 1898 if (iscsilun->allocmap != NULL) { 1899 iscsi_allocmap_init(iscsilun, bs->open_flags); 1900 } 1901 1902 return 0; 1903 } 1904 1905 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) 1906 { 1907 int ret = 0; 1908 int64_t total_size = 0; 1909 BlockDriverState *bs; 1910 IscsiLun *iscsilun = NULL; 1911 QDict *bs_options; 1912 1913 bs = bdrv_new(); 1914 1915 /* Read out options */ 1916 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1917 BDRV_SECTOR_SIZE); 1918 bs->opaque = g_new0(struct IscsiLun, 1); 1919 iscsilun = bs->opaque; 1920 1921 bs_options = qdict_new(); 1922 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1923 ret = iscsi_open(bs, bs_options, 0, NULL); 1924 QDECREF(bs_options); 1925 1926 if (ret != 0) { 1927 goto out; 1928 } 1929 iscsi_detach_aio_context(bs); 1930 if (iscsilun->type != TYPE_DISK) { 1931 ret = -ENODEV; 1932 goto out; 1933 } 1934 if (bs->total_sectors < total_size) { 1935 ret = -ENOSPC; 1936 goto out; 1937 } 1938 1939 ret = 0; 1940 out: 1941 if (iscsilun->iscsi != NULL) { 1942 iscsi_destroy_context(iscsilun->iscsi); 1943 } 1944 g_free(bs->opaque); 1945 bs->opaque = NULL; 1946 bdrv_unref(bs); 1947 return ret; 1948 } 1949 1950 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1951 { 1952 IscsiLun *iscsilun = bs->opaque; 1953 bdi->unallocated_blocks_are_zero = iscsilun->lbprz; 1954 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1955 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 1956 return 0; 1957 } 1958 1959 static void iscsi_invalidate_cache(BlockDriverState *bs, 1960 Error **errp) 1961 { 1962 IscsiLun *iscsilun = bs->opaque; 1963 iscsi_allocmap_invalidate(iscsilun); 1964 } 1965 1966 static QemuOptsList iscsi_create_opts = { 1967 .name = "iscsi-create-opts", 1968 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 1969 .desc = { 1970 { 1971 .name = BLOCK_OPT_SIZE, 1972 .type = QEMU_OPT_SIZE, 1973 .help = "Virtual disk size" 1974 }, 1975 { /* end of list */ } 1976 } 1977 }; 1978 1979 static BlockDriver bdrv_iscsi = { 1980 .format_name = "iscsi", 1981 .protocol_name = "iscsi", 1982 1983 .instance_size = sizeof(IscsiLun), 1984 .bdrv_needs_filename = true, 1985 .bdrv_file_open = iscsi_open, 1986 .bdrv_close = iscsi_close, 1987 .bdrv_create = iscsi_create, 1988 .create_opts = &iscsi_create_opts, 1989 .bdrv_reopen_prepare = iscsi_reopen_prepare, 1990 .bdrv_reopen_commit = iscsi_reopen_commit, 1991 .bdrv_invalidate_cache = iscsi_invalidate_cache, 1992 1993 .bdrv_getlength = iscsi_getlength, 1994 .bdrv_get_info = iscsi_get_info, 1995 .bdrv_truncate = iscsi_truncate, 1996 .bdrv_refresh_limits = iscsi_refresh_limits, 1997 1998 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1999 .bdrv_co_pdiscard = iscsi_co_pdiscard, 2000 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes, 2001 .bdrv_co_readv = iscsi_co_readv, 2002 .bdrv_co_writev_flags = iscsi_co_writev_flags, 2003 .bdrv_co_flush_to_disk = iscsi_co_flush, 2004 2005 #ifdef __linux__ 2006 .bdrv_aio_ioctl = iscsi_aio_ioctl, 2007 #endif 2008 2009 .bdrv_detach_aio_context = iscsi_detach_aio_context, 2010 .bdrv_attach_aio_context = iscsi_attach_aio_context, 2011 }; 2012 2013 static void iscsi_block_init(void) 2014 { 2015 bdrv_register(&bdrv_iscsi); 2016 } 2017 2018 block_init(iscsi_block_init); 2019