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 "sysemu/sysemu.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 QEMUBH *bh; 99 IscsiLun *iscsilun; 100 QEMUTimer retry_timer; 101 int err_code; 102 } IscsiTask; 103 104 typedef struct IscsiAIOCB { 105 BlockAIOCB common; 106 QEMUIOVector *qiov; 107 QEMUBH *bh; 108 IscsiLun *iscsilun; 109 struct scsi_task *task; 110 uint8_t *buf; 111 int status; 112 int64_t sector_num; 113 int nb_sectors; 114 int ret; 115 #ifdef __linux__ 116 sg_io_hdr_t *ioh; 117 #endif 118 } IscsiAIOCB; 119 120 /* libiscsi uses time_t so its enough to process events every second */ 121 #define EVENT_INTERVAL 1000 122 #define NOP_INTERVAL 5000 123 #define MAX_NOP_FAILURES 3 124 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 125 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768}; 126 127 /* this threshold is a trade-off knob to choose between 128 * the potential additional overhead of an extra GET_LBA_STATUS request 129 * vs. unnecessarily reading a lot of zero sectors over the wire. 130 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 131 * sectors we check the allocation status of the area covered by the 132 * request first if the allocationmap indicates that the area might be 133 * unallocated. */ 134 #define ISCSI_CHECKALLOC_THRES 64 135 136 static void 137 iscsi_bh_cb(void *p) 138 { 139 IscsiAIOCB *acb = p; 140 141 qemu_bh_delete(acb->bh); 142 143 g_free(acb->buf); 144 acb->buf = NULL; 145 146 acb->common.cb(acb->common.opaque, acb->status); 147 148 if (acb->task != NULL) { 149 scsi_free_scsi_task(acb->task); 150 acb->task = NULL; 151 } 152 153 qemu_aio_unref(acb); 154 } 155 156 static void 157 iscsi_schedule_bh(IscsiAIOCB *acb) 158 { 159 if (acb->bh) { 160 return; 161 } 162 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 163 qemu_bh_schedule(acb->bh); 164 } 165 166 static void iscsi_co_generic_bh_cb(void *opaque) 167 { 168 struct IscsiTask *iTask = opaque; 169 iTask->complete = 1; 170 qemu_bh_delete(iTask->bh); 171 qemu_coroutine_enter(iTask->co); 172 } 173 174 static void iscsi_retry_timer_expired(void *opaque) 175 { 176 struct IscsiTask *iTask = opaque; 177 iTask->complete = 1; 178 if (iTask->co) { 179 qemu_coroutine_enter(iTask->co); 180 } 181 } 182 183 static inline unsigned exp_random(double mean) 184 { 185 return -mean * log((double)rand() / RAND_MAX); 186 } 187 188 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in 189 * libiscsi 1.10.0, together with other constants we need. Use it as 190 * a hint that we have to define them ourselves if needed, to keep the 191 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for 192 * the test because SCSI_STATUS_* is an enum. 193 * 194 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes 195 * an enum, check against the LIBISCSI_API_VERSION macro, which was 196 * introduced in 1.11.0. If it is present, there is no need to define 197 * anything. 198 */ 199 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \ 200 !defined(LIBISCSI_API_VERSION) 201 #define SCSI_STATUS_TASK_SET_FULL 0x28 202 #define SCSI_STATUS_TIMEOUT 0x0f000002 203 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600 204 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00 205 #endif 206 207 static int iscsi_translate_sense(struct scsi_sense *sense) 208 { 209 int ret; 210 211 switch (sense->key) { 212 case SCSI_SENSE_NOT_READY: 213 return -EBUSY; 214 case SCSI_SENSE_DATA_PROTECTION: 215 return -EACCES; 216 case SCSI_SENSE_COMMAND_ABORTED: 217 return -ECANCELED; 218 case SCSI_SENSE_ILLEGAL_REQUEST: 219 /* Parse ASCQ */ 220 break; 221 default: 222 return -EIO; 223 } 224 switch (sense->ascq) { 225 case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR: 226 case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE: 227 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB: 228 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST: 229 ret = -EINVAL; 230 break; 231 case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE: 232 ret = -ENOSPC; 233 break; 234 case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED: 235 ret = -ENOTSUP; 236 break; 237 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT: 238 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED: 239 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN: 240 ret = -ENOMEDIUM; 241 break; 242 case SCSI_SENSE_ASCQ_WRITE_PROTECTED: 243 ret = -EACCES; 244 break; 245 default: 246 ret = -EIO; 247 break; 248 } 249 return ret; 250 } 251 252 static void 253 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 254 void *command_data, void *opaque) 255 { 256 struct IscsiTask *iTask = opaque; 257 struct scsi_task *task = command_data; 258 259 iTask->status = status; 260 iTask->do_retry = 0; 261 iTask->task = task; 262 263 if (status != SCSI_STATUS_GOOD) { 264 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 265 if (status == SCSI_STATUS_CHECK_CONDITION 266 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 267 error_report("iSCSI CheckCondition: %s", 268 iscsi_get_error(iscsi)); 269 iTask->do_retry = 1; 270 goto out; 271 } 272 if (status == SCSI_STATUS_BUSY || 273 status == SCSI_STATUS_TIMEOUT || 274 status == SCSI_STATUS_TASK_SET_FULL) { 275 unsigned retry_time = 276 exp_random(iscsi_retry_times[iTask->retries - 1]); 277 if (status == SCSI_STATUS_TIMEOUT) { 278 /* make sure the request is rescheduled AFTER the 279 * reconnect is initiated */ 280 retry_time = EVENT_INTERVAL * 2; 281 iTask->iscsilun->request_timed_out = true; 282 } 283 error_report("iSCSI Busy/TaskSetFull/TimeOut" 284 " (retry #%u in %u ms): %s", 285 iTask->retries, retry_time, 286 iscsi_get_error(iscsi)); 287 aio_timer_init(iTask->iscsilun->aio_context, 288 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 289 SCALE_MS, iscsi_retry_timer_expired, iTask); 290 timer_mod(&iTask->retry_timer, 291 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 292 iTask->do_retry = 1; 293 return; 294 } 295 } 296 iTask->err_code = iscsi_translate_sense(&task->sense); 297 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 298 } 299 300 out: 301 if (iTask->co) { 302 iTask->bh = aio_bh_new(iTask->iscsilun->aio_context, 303 iscsi_co_generic_bh_cb, iTask); 304 qemu_bh_schedule(iTask->bh); 305 } else { 306 iTask->complete = 1; 307 } 308 } 309 310 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 311 { 312 *iTask = (struct IscsiTask) { 313 .co = qemu_coroutine_self(), 314 .iscsilun = iscsilun, 315 }; 316 } 317 318 static void 319 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 320 void *private_data) 321 { 322 IscsiAIOCB *acb = private_data; 323 324 acb->status = -ECANCELED; 325 iscsi_schedule_bh(acb); 326 } 327 328 static void 329 iscsi_aio_cancel(BlockAIOCB *blockacb) 330 { 331 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 332 IscsiLun *iscsilun = acb->iscsilun; 333 334 if (acb->status != -EINPROGRESS) { 335 return; 336 } 337 338 /* send a task mgmt call to the target to cancel the task on the target */ 339 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 340 iscsi_abort_task_cb, acb); 341 342 } 343 344 static const AIOCBInfo iscsi_aiocb_info = { 345 .aiocb_size = sizeof(IscsiAIOCB), 346 .cancel_async = iscsi_aio_cancel, 347 }; 348 349 350 static void iscsi_process_read(void *arg); 351 static void iscsi_process_write(void *arg); 352 353 static void 354 iscsi_set_events(IscsiLun *iscsilun) 355 { 356 struct iscsi_context *iscsi = iscsilun->iscsi; 357 int ev = iscsi_which_events(iscsi); 358 359 if (ev != iscsilun->events) { 360 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi), 361 false, 362 (ev & POLLIN) ? iscsi_process_read : NULL, 363 (ev & POLLOUT) ? iscsi_process_write : NULL, 364 iscsilun); 365 iscsilun->events = ev; 366 } 367 } 368 369 static void iscsi_timed_check_events(void *opaque) 370 { 371 IscsiLun *iscsilun = opaque; 372 373 /* check for timed out requests */ 374 iscsi_service(iscsilun->iscsi, 0); 375 376 if (iscsilun->request_timed_out) { 377 iscsilun->request_timed_out = false; 378 iscsi_reconnect(iscsilun->iscsi); 379 } 380 381 /* newer versions of libiscsi may return zero events. Ensure we are able 382 * to return to service once this situation changes. */ 383 iscsi_set_events(iscsilun); 384 385 timer_mod(iscsilun->event_timer, 386 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 387 } 388 389 static void 390 iscsi_process_read(void *arg) 391 { 392 IscsiLun *iscsilun = arg; 393 struct iscsi_context *iscsi = iscsilun->iscsi; 394 395 iscsi_service(iscsi, POLLIN); 396 iscsi_set_events(iscsilun); 397 } 398 399 static void 400 iscsi_process_write(void *arg) 401 { 402 IscsiLun *iscsilun = arg; 403 struct iscsi_context *iscsi = iscsilun->iscsi; 404 405 iscsi_service(iscsi, POLLOUT); 406 iscsi_set_events(iscsilun); 407 } 408 409 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 410 { 411 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 412 } 413 414 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 415 { 416 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 417 } 418 419 static bool is_byte_request_lun_aligned(int64_t offset, int count, 420 IscsiLun *iscsilun) 421 { 422 if (offset % iscsilun->block_size || count % iscsilun->block_size) { 423 error_report("iSCSI misaligned request: " 424 "iscsilun->block_size %u, offset %" PRIi64 425 ", count %d", 426 iscsilun->block_size, offset, count); 427 return false; 428 } 429 return true; 430 } 431 432 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors, 433 IscsiLun *iscsilun) 434 { 435 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS); 436 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS, 437 nb_sectors << BDRV_SECTOR_BITS, 438 iscsilun); 439 } 440 441 static void iscsi_allocmap_free(IscsiLun *iscsilun) 442 { 443 g_free(iscsilun->allocmap); 444 g_free(iscsilun->allocmap_valid); 445 iscsilun->allocmap = NULL; 446 iscsilun->allocmap_valid = NULL; 447 } 448 449 450 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags) 451 { 452 iscsi_allocmap_free(iscsilun); 453 454 iscsilun->allocmap_size = 455 DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun), 456 iscsilun->cluster_sectors); 457 458 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size); 459 if (!iscsilun->allocmap) { 460 return -ENOMEM; 461 } 462 463 if (open_flags & BDRV_O_NOCACHE) { 464 /* in case that cache.direct = on all allocmap entries are 465 * treated as invalid to force a relookup of the block 466 * status on every read request */ 467 return 0; 468 } 469 470 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size); 471 if (!iscsilun->allocmap_valid) { 472 /* if we are under memory pressure free the allocmap as well */ 473 iscsi_allocmap_free(iscsilun); 474 return -ENOMEM; 475 } 476 477 return 0; 478 } 479 480 static void 481 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num, 482 int nb_sectors, bool allocated, bool valid) 483 { 484 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk; 485 486 if (iscsilun->allocmap == NULL) { 487 return; 488 } 489 /* expand to entirely contain all affected clusters */ 490 cl_num_expanded = sector_num / iscsilun->cluster_sectors; 491 nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors, 492 iscsilun->cluster_sectors) - cl_num_expanded; 493 /* shrink to touch only completely contained clusters */ 494 cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 495 nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors 496 - cl_num_shrunk; 497 if (allocated) { 498 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded); 499 } else { 500 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk); 501 } 502 503 if (iscsilun->allocmap_valid == NULL) { 504 return; 505 } 506 if (valid) { 507 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk); 508 } else { 509 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded, 510 nb_cls_expanded); 511 } 512 } 513 514 static void 515 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num, 516 int nb_sectors) 517 { 518 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true); 519 } 520 521 static void 522 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num, 523 int nb_sectors) 524 { 525 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update 526 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid. 527 */ 528 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true); 529 } 530 531 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num, 532 int nb_sectors) 533 { 534 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false); 535 } 536 537 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun) 538 { 539 if (iscsilun->allocmap) { 540 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size); 541 } 542 if (iscsilun->allocmap_valid) { 543 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size); 544 } 545 } 546 547 static inline bool 548 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num, 549 int nb_sectors) 550 { 551 unsigned long size; 552 if (iscsilun->allocmap == NULL) { 553 return true; 554 } 555 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 556 return !(find_next_bit(iscsilun->allocmap, size, 557 sector_num / iscsilun->cluster_sectors) == size); 558 } 559 560 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun, 561 int64_t sector_num, int nb_sectors) 562 { 563 unsigned long size; 564 if (iscsilun->allocmap_valid == NULL) { 565 return false; 566 } 567 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 568 return (find_next_zero_bit(iscsilun->allocmap_valid, size, 569 sector_num / iscsilun->cluster_sectors) == size); 570 } 571 572 static int coroutine_fn 573 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 574 QEMUIOVector *iov, int flags) 575 { 576 IscsiLun *iscsilun = bs->opaque; 577 struct IscsiTask iTask; 578 uint64_t lba; 579 uint32_t num_sectors; 580 bool fua = flags & BDRV_REQ_FUA; 581 582 if (fua) { 583 assert(iscsilun->dpofua); 584 } 585 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 586 return -EINVAL; 587 } 588 589 if (bs->bl.max_transfer) { 590 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 591 } 592 593 lba = sector_qemu2lun(sector_num, iscsilun); 594 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 595 iscsi_co_init_iscsitask(iscsilun, &iTask); 596 retry: 597 if (iscsilun->use_16_for_rw) { 598 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 599 NULL, num_sectors * iscsilun->block_size, 600 iscsilun->block_size, 0, 0, fua, 0, 0, 601 iscsi_co_generic_cb, &iTask); 602 } else { 603 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 604 NULL, num_sectors * iscsilun->block_size, 605 iscsilun->block_size, 0, 0, fua, 0, 0, 606 iscsi_co_generic_cb, &iTask); 607 } 608 if (iTask.task == NULL) { 609 return -ENOMEM; 610 } 611 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 612 iov->niov); 613 while (!iTask.complete) { 614 iscsi_set_events(iscsilun); 615 qemu_coroutine_yield(); 616 } 617 618 if (iTask.task != NULL) { 619 scsi_free_scsi_task(iTask.task); 620 iTask.task = NULL; 621 } 622 623 if (iTask.do_retry) { 624 iTask.complete = 0; 625 goto retry; 626 } 627 628 if (iTask.status != SCSI_STATUS_GOOD) { 629 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors); 630 return iTask.err_code; 631 } 632 633 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors); 634 635 return 0; 636 } 637 638 639 640 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 641 int64_t sector_num, 642 int nb_sectors, int *pnum, 643 BlockDriverState **file) 644 { 645 IscsiLun *iscsilun = bs->opaque; 646 struct scsi_get_lba_status *lbas = NULL; 647 struct scsi_lba_status_descriptor *lbasd = NULL; 648 struct IscsiTask iTask; 649 int64_t ret; 650 651 iscsi_co_init_iscsitask(iscsilun, &iTask); 652 653 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 654 ret = -EINVAL; 655 goto out; 656 } 657 658 /* default to all sectors allocated */ 659 ret = BDRV_BLOCK_DATA; 660 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 661 *pnum = nb_sectors; 662 663 /* LUN does not support logical block provisioning */ 664 if (!iscsilun->lbpme) { 665 goto out; 666 } 667 668 retry: 669 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 670 sector_qemu2lun(sector_num, iscsilun), 671 8 + 16, iscsi_co_generic_cb, 672 &iTask) == NULL) { 673 ret = -ENOMEM; 674 goto out; 675 } 676 677 while (!iTask.complete) { 678 iscsi_set_events(iscsilun); 679 qemu_coroutine_yield(); 680 } 681 682 if (iTask.do_retry) { 683 if (iTask.task != NULL) { 684 scsi_free_scsi_task(iTask.task); 685 iTask.task = NULL; 686 } 687 iTask.complete = 0; 688 goto retry; 689 } 690 691 if (iTask.status != SCSI_STATUS_GOOD) { 692 /* in case the get_lba_status_callout fails (i.e. 693 * because the device is busy or the cmd is not 694 * supported) we pretend all blocks are allocated 695 * for backwards compatibility */ 696 goto out; 697 } 698 699 lbas = scsi_datain_unmarshall(iTask.task); 700 if (lbas == NULL) { 701 ret = -EIO; 702 goto out; 703 } 704 705 lbasd = &lbas->descriptors[0]; 706 707 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 708 ret = -EIO; 709 goto out; 710 } 711 712 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 713 714 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 715 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 716 ret &= ~BDRV_BLOCK_DATA; 717 if (iscsilun->lbprz) { 718 ret |= BDRV_BLOCK_ZERO; 719 } 720 } 721 722 if (ret & BDRV_BLOCK_ZERO) { 723 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum); 724 } else { 725 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum); 726 } 727 728 if (*pnum > nb_sectors) { 729 *pnum = nb_sectors; 730 } 731 out: 732 if (iTask.task != NULL) { 733 scsi_free_scsi_task(iTask.task); 734 } 735 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) { 736 *file = bs; 737 } 738 return ret; 739 } 740 741 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 742 int64_t sector_num, int nb_sectors, 743 QEMUIOVector *iov) 744 { 745 IscsiLun *iscsilun = bs->opaque; 746 struct IscsiTask iTask; 747 uint64_t lba; 748 uint32_t num_sectors; 749 750 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 751 return -EINVAL; 752 } 753 754 if (bs->bl.max_transfer) { 755 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer); 756 } 757 758 /* if cache.direct is off and we have a valid entry in our allocation map 759 * we can skip checking the block status and directly return zeroes if 760 * the request falls within an unallocated area */ 761 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 762 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 763 qemu_iovec_memset(iov, 0, 0x00, iov->size); 764 return 0; 765 } 766 767 if (nb_sectors >= ISCSI_CHECKALLOC_THRES && 768 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) && 769 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 770 int pnum; 771 BlockDriverState *file; 772 /* check the block status from the beginning of the cluster 773 * containing the start sector */ 774 int64_t ret = iscsi_co_get_block_status(bs, 775 sector_num - sector_num % iscsilun->cluster_sectors, 776 BDRV_REQUEST_MAX_SECTORS, &pnum, &file); 777 if (ret < 0) { 778 return ret; 779 } 780 /* if the whole request falls into an unallocated area we can avoid 781 * to read and directly return zeroes instead */ 782 if (ret & BDRV_BLOCK_ZERO && 783 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) { 784 qemu_iovec_memset(iov, 0, 0x00, iov->size); 785 return 0; 786 } 787 } 788 789 lba = sector_qemu2lun(sector_num, iscsilun); 790 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 791 792 iscsi_co_init_iscsitask(iscsilun, &iTask); 793 retry: 794 if (iscsilun->use_16_for_rw) { 795 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 796 num_sectors * iscsilun->block_size, 797 iscsilun->block_size, 0, 0, 0, 0, 0, 798 iscsi_co_generic_cb, &iTask); 799 } else { 800 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 801 num_sectors * iscsilun->block_size, 802 iscsilun->block_size, 803 0, 0, 0, 0, 0, 804 iscsi_co_generic_cb, &iTask); 805 } 806 if (iTask.task == NULL) { 807 return -ENOMEM; 808 } 809 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 810 811 while (!iTask.complete) { 812 iscsi_set_events(iscsilun); 813 qemu_coroutine_yield(); 814 } 815 816 if (iTask.task != NULL) { 817 scsi_free_scsi_task(iTask.task); 818 iTask.task = NULL; 819 } 820 821 if (iTask.do_retry) { 822 iTask.complete = 0; 823 goto retry; 824 } 825 826 if (iTask.status != SCSI_STATUS_GOOD) { 827 return iTask.err_code; 828 } 829 830 return 0; 831 } 832 833 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 834 { 835 IscsiLun *iscsilun = bs->opaque; 836 struct IscsiTask iTask; 837 838 iscsi_co_init_iscsitask(iscsilun, &iTask); 839 retry: 840 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 841 0, iscsi_co_generic_cb, &iTask) == NULL) { 842 return -ENOMEM; 843 } 844 845 while (!iTask.complete) { 846 iscsi_set_events(iscsilun); 847 qemu_coroutine_yield(); 848 } 849 850 if (iTask.task != NULL) { 851 scsi_free_scsi_task(iTask.task); 852 iTask.task = NULL; 853 } 854 855 if (iTask.do_retry) { 856 iTask.complete = 0; 857 goto retry; 858 } 859 860 if (iTask.status != SCSI_STATUS_GOOD) { 861 return iTask.err_code; 862 } 863 864 return 0; 865 } 866 867 #ifdef __linux__ 868 static void 869 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 870 void *command_data, void *opaque) 871 { 872 IscsiAIOCB *acb = opaque; 873 874 g_free(acb->buf); 875 acb->buf = NULL; 876 877 acb->status = 0; 878 if (status < 0) { 879 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 880 iscsi_get_error(iscsi)); 881 acb->status = iscsi_translate_sense(&acb->task->sense); 882 } 883 884 acb->ioh->driver_status = 0; 885 acb->ioh->host_status = 0; 886 acb->ioh->resid = 0; 887 acb->ioh->status = status; 888 889 #define SG_ERR_DRIVER_SENSE 0x08 890 891 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 892 int ss; 893 894 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 895 896 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 897 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 898 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 899 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 900 } 901 902 iscsi_schedule_bh(acb); 903 } 904 905 static void iscsi_ioctl_bh_completion(void *opaque) 906 { 907 IscsiAIOCB *acb = opaque; 908 909 qemu_bh_delete(acb->bh); 910 acb->common.cb(acb->common.opaque, acb->ret); 911 qemu_aio_unref(acb); 912 } 913 914 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf) 915 { 916 BlockDriverState *bs = acb->common.bs; 917 IscsiLun *iscsilun = bs->opaque; 918 int ret = 0; 919 920 switch (req) { 921 case SG_GET_VERSION_NUM: 922 *(int *)buf = 30000; 923 break; 924 case SG_GET_SCSI_ID: 925 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 926 break; 927 default: 928 ret = -EINVAL; 929 } 930 assert(!acb->bh); 931 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), 932 iscsi_ioctl_bh_completion, acb); 933 acb->ret = ret; 934 qemu_bh_schedule(acb->bh); 935 } 936 937 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 938 unsigned long int req, void *buf, 939 BlockCompletionFunc *cb, void *opaque) 940 { 941 IscsiLun *iscsilun = bs->opaque; 942 struct iscsi_context *iscsi = iscsilun->iscsi; 943 struct iscsi_data data; 944 IscsiAIOCB *acb; 945 946 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 947 948 acb->iscsilun = iscsilun; 949 acb->bh = NULL; 950 acb->status = -EINPROGRESS; 951 acb->buf = NULL; 952 acb->ioh = buf; 953 954 if (req != SG_IO) { 955 iscsi_ioctl_handle_emulated(acb, req, buf); 956 return &acb->common; 957 } 958 959 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { 960 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", 961 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); 962 qemu_aio_unref(acb); 963 return NULL; 964 } 965 966 acb->task = malloc(sizeof(struct scsi_task)); 967 if (acb->task == NULL) { 968 error_report("iSCSI: Failed to allocate task for scsi command. %s", 969 iscsi_get_error(iscsi)); 970 qemu_aio_unref(acb); 971 return NULL; 972 } 973 memset(acb->task, 0, sizeof(struct scsi_task)); 974 975 switch (acb->ioh->dxfer_direction) { 976 case SG_DXFER_TO_DEV: 977 acb->task->xfer_dir = SCSI_XFER_WRITE; 978 break; 979 case SG_DXFER_FROM_DEV: 980 acb->task->xfer_dir = SCSI_XFER_READ; 981 break; 982 default: 983 acb->task->xfer_dir = SCSI_XFER_NONE; 984 break; 985 } 986 987 acb->task->cdb_size = acb->ioh->cmd_len; 988 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 989 acb->task->expxferlen = acb->ioh->dxfer_len; 990 991 data.size = 0; 992 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 993 if (acb->ioh->iovec_count == 0) { 994 data.data = acb->ioh->dxferp; 995 data.size = acb->ioh->dxfer_len; 996 } else { 997 scsi_task_set_iov_out(acb->task, 998 (struct scsi_iovec *) acb->ioh->dxferp, 999 acb->ioh->iovec_count); 1000 } 1001 } 1002 1003 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 1004 iscsi_aio_ioctl_cb, 1005 (data.size > 0) ? &data : NULL, 1006 acb) != 0) { 1007 scsi_free_scsi_task(acb->task); 1008 qemu_aio_unref(acb); 1009 return NULL; 1010 } 1011 1012 /* tell libiscsi to read straight into the buffer we got from ioctl */ 1013 if (acb->task->xfer_dir == SCSI_XFER_READ) { 1014 if (acb->ioh->iovec_count == 0) { 1015 scsi_task_add_data_in_buffer(acb->task, 1016 acb->ioh->dxfer_len, 1017 acb->ioh->dxferp); 1018 } else { 1019 scsi_task_set_iov_in(acb->task, 1020 (struct scsi_iovec *) acb->ioh->dxferp, 1021 acb->ioh->iovec_count); 1022 } 1023 } 1024 1025 iscsi_set_events(iscsilun); 1026 1027 return &acb->common; 1028 } 1029 1030 #endif 1031 1032 static int64_t 1033 iscsi_getlength(BlockDriverState *bs) 1034 { 1035 IscsiLun *iscsilun = bs->opaque; 1036 int64_t len; 1037 1038 len = iscsilun->num_blocks; 1039 len *= iscsilun->block_size; 1040 1041 return len; 1042 } 1043 1044 static int 1045 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int count) 1046 { 1047 IscsiLun *iscsilun = bs->opaque; 1048 struct IscsiTask iTask; 1049 struct unmap_list list; 1050 1051 assert(is_byte_request_lun_aligned(offset, count, iscsilun)); 1052 1053 if (!iscsilun->lbp.lbpu) { 1054 /* UNMAP is not supported by the target */ 1055 return 0; 1056 } 1057 1058 list.lba = offset / iscsilun->block_size; 1059 list.num = count / iscsilun->block_size; 1060 1061 iscsi_co_init_iscsitask(iscsilun, &iTask); 1062 retry: 1063 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 1064 iscsi_co_generic_cb, &iTask) == NULL) { 1065 return -ENOMEM; 1066 } 1067 1068 while (!iTask.complete) { 1069 iscsi_set_events(iscsilun); 1070 qemu_coroutine_yield(); 1071 } 1072 1073 if (iTask.task != NULL) { 1074 scsi_free_scsi_task(iTask.task); 1075 iTask.task = NULL; 1076 } 1077 1078 if (iTask.do_retry) { 1079 iTask.complete = 0; 1080 goto retry; 1081 } 1082 1083 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 1084 /* the target might fail with a check condition if it 1085 is not happy with the alignment of the UNMAP request 1086 we silently fail in this case */ 1087 return 0; 1088 } 1089 1090 if (iTask.status != SCSI_STATUS_GOOD) { 1091 return iTask.err_code; 1092 } 1093 1094 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1095 count >> BDRV_SECTOR_BITS); 1096 1097 return 0; 1098 } 1099 1100 static int 1101 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1102 int count, BdrvRequestFlags flags) 1103 { 1104 IscsiLun *iscsilun = bs->opaque; 1105 struct IscsiTask iTask; 1106 uint64_t lba; 1107 uint32_t nb_blocks; 1108 bool use_16_for_ws = iscsilun->use_16_for_rw; 1109 1110 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) { 1111 return -ENOTSUP; 1112 } 1113 1114 if (flags & BDRV_REQ_MAY_UNMAP) { 1115 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 1116 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 1117 use_16_for_ws = true; 1118 } 1119 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 1120 /* WRITESAME16 with UNMAP is not supported by the target, 1121 * fall back and try WRITESAME10/16 without UNMAP */ 1122 flags &= ~BDRV_REQ_MAY_UNMAP; 1123 use_16_for_ws = iscsilun->use_16_for_rw; 1124 } 1125 } 1126 1127 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 1128 /* WRITESAME without UNMAP is not supported by the target */ 1129 return -ENOTSUP; 1130 } 1131 1132 lba = offset / iscsilun->block_size; 1133 nb_blocks = count / iscsilun->block_size; 1134 1135 if (iscsilun->zeroblock == NULL) { 1136 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size); 1137 if (iscsilun->zeroblock == NULL) { 1138 return -ENOMEM; 1139 } 1140 } 1141 1142 iscsi_co_init_iscsitask(iscsilun, &iTask); 1143 retry: 1144 if (use_16_for_ws) { 1145 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1146 iscsilun->zeroblock, iscsilun->block_size, 1147 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1148 0, 0, iscsi_co_generic_cb, &iTask); 1149 } else { 1150 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 1151 iscsilun->zeroblock, iscsilun->block_size, 1152 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1153 0, 0, iscsi_co_generic_cb, &iTask); 1154 } 1155 if (iTask.task == NULL) { 1156 return -ENOMEM; 1157 } 1158 1159 while (!iTask.complete) { 1160 iscsi_set_events(iscsilun); 1161 qemu_coroutine_yield(); 1162 } 1163 1164 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1165 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1166 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 1167 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 1168 /* WRITE SAME is not supported by the target */ 1169 iscsilun->has_write_same = false; 1170 scsi_free_scsi_task(iTask.task); 1171 return -ENOTSUP; 1172 } 1173 1174 if (iTask.task != NULL) { 1175 scsi_free_scsi_task(iTask.task); 1176 iTask.task = NULL; 1177 } 1178 1179 if (iTask.do_retry) { 1180 iTask.complete = 0; 1181 goto retry; 1182 } 1183 1184 if (iTask.status != SCSI_STATUS_GOOD) { 1185 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1186 count >> BDRV_SECTOR_BITS); 1187 return iTask.err_code; 1188 } 1189 1190 if (flags & BDRV_REQ_MAY_UNMAP) { 1191 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS, 1192 count >> BDRV_SECTOR_BITS); 1193 } else { 1194 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS, 1195 count >> BDRV_SECTOR_BITS); 1196 } 1197 1198 return 0; 1199 } 1200 1201 static void parse_chap(struct iscsi_context *iscsi, const char *target, 1202 Error **errp) 1203 { 1204 QemuOptsList *list; 1205 QemuOpts *opts; 1206 const char *user = NULL; 1207 const char *password = NULL; 1208 const char *secretid; 1209 char *secret = NULL; 1210 1211 list = qemu_find_opts("iscsi"); 1212 if (!list) { 1213 return; 1214 } 1215 1216 opts = qemu_opts_find(list, target); 1217 if (opts == NULL) { 1218 opts = QTAILQ_FIRST(&list->head); 1219 if (!opts) { 1220 return; 1221 } 1222 } 1223 1224 user = qemu_opt_get(opts, "user"); 1225 if (!user) { 1226 return; 1227 } 1228 1229 secretid = qemu_opt_get(opts, "password-secret"); 1230 password = qemu_opt_get(opts, "password"); 1231 if (secretid && password) { 1232 error_setg(errp, "'password' and 'password-secret' properties are " 1233 "mutually exclusive"); 1234 return; 1235 } 1236 if (secretid) { 1237 secret = qcrypto_secret_lookup_as_utf8(secretid, errp); 1238 if (!secret) { 1239 return; 1240 } 1241 password = secret; 1242 } else if (!password) { 1243 error_setg(errp, "CHAP username specified but no password was given"); 1244 return; 1245 } 1246 1247 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1248 error_setg(errp, "Failed to set initiator username and password"); 1249 } 1250 1251 g_free(secret); 1252 } 1253 1254 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 1255 Error **errp) 1256 { 1257 QemuOptsList *list; 1258 QemuOpts *opts; 1259 const char *digest = NULL; 1260 1261 list = qemu_find_opts("iscsi"); 1262 if (!list) { 1263 return; 1264 } 1265 1266 opts = qemu_opts_find(list, target); 1267 if (opts == NULL) { 1268 opts = QTAILQ_FIRST(&list->head); 1269 if (!opts) { 1270 return; 1271 } 1272 } 1273 1274 digest = qemu_opt_get(opts, "header-digest"); 1275 if (!digest) { 1276 return; 1277 } 1278 1279 if (!strcmp(digest, "CRC32C")) { 1280 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1281 } else if (!strcmp(digest, "NONE")) { 1282 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1283 } else if (!strcmp(digest, "CRC32C-NONE")) { 1284 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1285 } else if (!strcmp(digest, "NONE-CRC32C")) { 1286 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1287 } else { 1288 error_setg(errp, "Invalid header-digest setting : %s", digest); 1289 } 1290 } 1291 1292 static char *parse_initiator_name(const char *target) 1293 { 1294 QemuOptsList *list; 1295 QemuOpts *opts; 1296 const char *name; 1297 char *iscsi_name; 1298 UuidInfo *uuid_info; 1299 1300 list = qemu_find_opts("iscsi"); 1301 if (list) { 1302 opts = qemu_opts_find(list, target); 1303 if (!opts) { 1304 opts = QTAILQ_FIRST(&list->head); 1305 } 1306 if (opts) { 1307 name = qemu_opt_get(opts, "initiator-name"); 1308 if (name) { 1309 return g_strdup(name); 1310 } 1311 } 1312 } 1313 1314 uuid_info = qmp_query_uuid(NULL); 1315 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1316 name = qemu_get_vm_name(); 1317 } else { 1318 name = uuid_info->UUID; 1319 } 1320 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1321 name ? ":" : "", name ? name : ""); 1322 qapi_free_UuidInfo(uuid_info); 1323 return iscsi_name; 1324 } 1325 1326 static int parse_timeout(const char *target) 1327 { 1328 QemuOptsList *list; 1329 QemuOpts *opts; 1330 const char *timeout; 1331 1332 list = qemu_find_opts("iscsi"); 1333 if (list) { 1334 opts = qemu_opts_find(list, target); 1335 if (!opts) { 1336 opts = QTAILQ_FIRST(&list->head); 1337 } 1338 if (opts) { 1339 timeout = qemu_opt_get(opts, "timeout"); 1340 if (timeout) { 1341 return atoi(timeout); 1342 } 1343 } 1344 } 1345 1346 return 0; 1347 } 1348 1349 static void iscsi_nop_timed_event(void *opaque) 1350 { 1351 IscsiLun *iscsilun = opaque; 1352 1353 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) { 1354 error_report("iSCSI: NOP timeout. Reconnecting..."); 1355 iscsilun->request_timed_out = true; 1356 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1357 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1358 return; 1359 } 1360 1361 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1362 iscsi_set_events(iscsilun); 1363 } 1364 1365 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1366 { 1367 struct scsi_task *task = NULL; 1368 struct scsi_readcapacity10 *rc10 = NULL; 1369 struct scsi_readcapacity16 *rc16 = NULL; 1370 int retries = ISCSI_CMD_RETRIES; 1371 1372 do { 1373 if (task != NULL) { 1374 scsi_free_scsi_task(task); 1375 task = NULL; 1376 } 1377 1378 switch (iscsilun->type) { 1379 case TYPE_DISK: 1380 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1381 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1382 rc16 = scsi_datain_unmarshall(task); 1383 if (rc16 == NULL) { 1384 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1385 } else { 1386 iscsilun->block_size = rc16->block_length; 1387 iscsilun->num_blocks = rc16->returned_lba + 1; 1388 iscsilun->lbpme = !!rc16->lbpme; 1389 iscsilun->lbprz = !!rc16->lbprz; 1390 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1391 } 1392 break; 1393 } 1394 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1395 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 1396 break; 1397 } 1398 /* Fall through and try READ CAPACITY(10) instead. */ 1399 case TYPE_ROM: 1400 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1401 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1402 rc10 = scsi_datain_unmarshall(task); 1403 if (rc10 == NULL) { 1404 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1405 } else { 1406 iscsilun->block_size = rc10->block_size; 1407 if (rc10->lba == 0) { 1408 /* blank disk loaded */ 1409 iscsilun->num_blocks = 0; 1410 } else { 1411 iscsilun->num_blocks = rc10->lba + 1; 1412 } 1413 } 1414 } 1415 break; 1416 default: 1417 return; 1418 } 1419 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1420 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1421 && retries-- > 0); 1422 1423 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1424 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command"); 1425 } else if (!iscsilun->block_size || 1426 iscsilun->block_size % BDRV_SECTOR_SIZE) { 1427 error_setg(errp, "iSCSI: the target returned an invalid " 1428 "block size of %d.", iscsilun->block_size); 1429 } 1430 if (task) { 1431 scsi_free_scsi_task(task); 1432 } 1433 } 1434 1435 /* TODO Convert to fine grained options */ 1436 static QemuOptsList runtime_opts = { 1437 .name = "iscsi", 1438 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1439 .desc = { 1440 { 1441 .name = "filename", 1442 .type = QEMU_OPT_STRING, 1443 .help = "URL to the iscsi image", 1444 }, 1445 { /* end of list */ } 1446 }, 1447 }; 1448 1449 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1450 int evpd, int pc, void **inq, Error **errp) 1451 { 1452 int full_size; 1453 struct scsi_task *task = NULL; 1454 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1455 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1456 goto fail; 1457 } 1458 full_size = scsi_datain_getfullsize(task); 1459 if (full_size > task->datain.size) { 1460 scsi_free_scsi_task(task); 1461 1462 /* we need more data for the full list */ 1463 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1464 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1465 goto fail; 1466 } 1467 } 1468 1469 *inq = scsi_datain_unmarshall(task); 1470 if (*inq == NULL) { 1471 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1472 goto fail_with_err; 1473 } 1474 1475 return task; 1476 1477 fail: 1478 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1479 iscsi_get_error(iscsi)); 1480 fail_with_err: 1481 if (task != NULL) { 1482 scsi_free_scsi_task(task); 1483 } 1484 return NULL; 1485 } 1486 1487 static void iscsi_detach_aio_context(BlockDriverState *bs) 1488 { 1489 IscsiLun *iscsilun = bs->opaque; 1490 1491 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi), 1492 false, NULL, NULL, NULL); 1493 iscsilun->events = 0; 1494 1495 if (iscsilun->nop_timer) { 1496 timer_del(iscsilun->nop_timer); 1497 timer_free(iscsilun->nop_timer); 1498 iscsilun->nop_timer = NULL; 1499 } 1500 if (iscsilun->event_timer) { 1501 timer_del(iscsilun->event_timer); 1502 timer_free(iscsilun->event_timer); 1503 iscsilun->event_timer = NULL; 1504 } 1505 } 1506 1507 static void iscsi_attach_aio_context(BlockDriverState *bs, 1508 AioContext *new_context) 1509 { 1510 IscsiLun *iscsilun = bs->opaque; 1511 1512 iscsilun->aio_context = new_context; 1513 iscsi_set_events(iscsilun); 1514 1515 /* Set up a timer for sending out iSCSI NOPs */ 1516 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1517 QEMU_CLOCK_REALTIME, SCALE_MS, 1518 iscsi_nop_timed_event, iscsilun); 1519 timer_mod(iscsilun->nop_timer, 1520 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1521 1522 /* Set up a timer for periodic calls to iscsi_set_events and to 1523 * scan for command timeout */ 1524 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context, 1525 QEMU_CLOCK_REALTIME, SCALE_MS, 1526 iscsi_timed_check_events, iscsilun); 1527 timer_mod(iscsilun->event_timer, 1528 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL); 1529 } 1530 1531 static void iscsi_modesense_sync(IscsiLun *iscsilun) 1532 { 1533 struct scsi_task *task; 1534 struct scsi_mode_sense *ms = NULL; 1535 iscsilun->write_protected = false; 1536 iscsilun->dpofua = false; 1537 1538 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun, 1539 1, SCSI_MODESENSE_PC_CURRENT, 1540 0x3F, 0, 255); 1541 if (task == NULL) { 1542 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s", 1543 iscsi_get_error(iscsilun->iscsi)); 1544 goto out; 1545 } 1546 1547 if (task->status != SCSI_STATUS_GOOD) { 1548 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable"); 1549 goto out; 1550 } 1551 ms = scsi_datain_unmarshall(task); 1552 if (!ms) { 1553 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s", 1554 iscsi_get_error(iscsilun->iscsi)); 1555 goto out; 1556 } 1557 iscsilun->write_protected = ms->device_specific_parameter & 0x80; 1558 iscsilun->dpofua = ms->device_specific_parameter & 0x10; 1559 1560 out: 1561 if (task) { 1562 scsi_free_scsi_task(task); 1563 } 1564 } 1565 1566 /* 1567 * We support iscsi url's on the form 1568 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1569 */ 1570 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1571 Error **errp) 1572 { 1573 IscsiLun *iscsilun = bs->opaque; 1574 struct iscsi_context *iscsi = NULL; 1575 struct iscsi_url *iscsi_url = NULL; 1576 struct scsi_task *task = NULL; 1577 struct scsi_inquiry_standard *inq = NULL; 1578 struct scsi_inquiry_supported_pages *inq_vpd; 1579 char *initiator_name = NULL; 1580 QemuOpts *opts; 1581 Error *local_err = NULL; 1582 const char *filename; 1583 int i, ret = 0, timeout = 0; 1584 1585 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1586 qemu_opts_absorb_qdict(opts, options, &local_err); 1587 if (local_err) { 1588 error_propagate(errp, local_err); 1589 ret = -EINVAL; 1590 goto out; 1591 } 1592 1593 filename = qemu_opt_get(opts, "filename"); 1594 1595 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1596 if (iscsi_url == NULL) { 1597 error_setg(errp, "Failed to parse URL : %s", filename); 1598 ret = -EINVAL; 1599 goto out; 1600 } 1601 1602 memset(iscsilun, 0, sizeof(IscsiLun)); 1603 1604 initiator_name = parse_initiator_name(iscsi_url->target); 1605 1606 iscsi = iscsi_create_context(initiator_name); 1607 if (iscsi == NULL) { 1608 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1609 ret = -ENOMEM; 1610 goto out; 1611 } 1612 1613 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1614 error_setg(errp, "iSCSI: Failed to set target name."); 1615 ret = -EINVAL; 1616 goto out; 1617 } 1618 1619 if (iscsi_url->user[0] != '\0') { 1620 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1621 iscsi_url->passwd); 1622 if (ret != 0) { 1623 error_setg(errp, "Failed to set initiator username and password"); 1624 ret = -EINVAL; 1625 goto out; 1626 } 1627 } 1628 1629 /* check if we got CHAP username/password via the options */ 1630 parse_chap(iscsi, iscsi_url->target, &local_err); 1631 if (local_err != NULL) { 1632 error_propagate(errp, local_err); 1633 ret = -EINVAL; 1634 goto out; 1635 } 1636 1637 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1638 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1639 ret = -EINVAL; 1640 goto out; 1641 } 1642 1643 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1644 1645 /* check if we got HEADER_DIGEST via the options */ 1646 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1647 if (local_err != NULL) { 1648 error_propagate(errp, local_err); 1649 ret = -EINVAL; 1650 goto out; 1651 } 1652 1653 /* timeout handling is broken in libiscsi before 1.15.0 */ 1654 timeout = parse_timeout(iscsi_url->target); 1655 #if defined(LIBISCSI_API_VERSION) && LIBISCSI_API_VERSION >= 20150621 1656 iscsi_set_timeout(iscsi, timeout); 1657 #else 1658 if (timeout) { 1659 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0"); 1660 } 1661 #endif 1662 1663 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1664 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1665 iscsi_get_error(iscsi)); 1666 ret = -EINVAL; 1667 goto out; 1668 } 1669 1670 iscsilun->iscsi = iscsi; 1671 iscsilun->aio_context = bdrv_get_aio_context(bs); 1672 iscsilun->lun = iscsi_url->lun; 1673 iscsilun->has_write_same = true; 1674 1675 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1676 (void **) &inq, errp); 1677 if (task == NULL) { 1678 ret = -EINVAL; 1679 goto out; 1680 } 1681 iscsilun->type = inq->periperal_device_type; 1682 scsi_free_scsi_task(task); 1683 task = NULL; 1684 1685 iscsi_modesense_sync(iscsilun); 1686 if (iscsilun->dpofua) { 1687 bs->supported_write_flags = BDRV_REQ_FUA; 1688 } 1689 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP; 1690 1691 /* Check the write protect flag of the LUN if we want to write */ 1692 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) && 1693 iscsilun->write_protected) { 1694 error_setg(errp, "Cannot open a write protected LUN as read-write"); 1695 ret = -EACCES; 1696 goto out; 1697 } 1698 1699 iscsi_readcapacity_sync(iscsilun, &local_err); 1700 if (local_err != NULL) { 1701 error_propagate(errp, local_err); 1702 ret = -EINVAL; 1703 goto out; 1704 } 1705 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1706 1707 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1708 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1709 * will try to read from the device to guess the image format. 1710 */ 1711 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1712 bs->sg = true; 1713 } 1714 1715 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1716 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1717 (void **) &inq_vpd, errp); 1718 if (task == NULL) { 1719 ret = -EINVAL; 1720 goto out; 1721 } 1722 for (i = 0; i < inq_vpd->num_pages; i++) { 1723 struct scsi_task *inq_task; 1724 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1725 struct scsi_inquiry_block_limits *inq_bl; 1726 switch (inq_vpd->pages[i]) { 1727 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1728 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1729 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1730 (void **) &inq_lbp, errp); 1731 if (inq_task == NULL) { 1732 ret = -EINVAL; 1733 goto out; 1734 } 1735 memcpy(&iscsilun->lbp, inq_lbp, 1736 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1737 scsi_free_scsi_task(inq_task); 1738 break; 1739 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1740 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1741 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1742 (void **) &inq_bl, errp); 1743 if (inq_task == NULL) { 1744 ret = -EINVAL; 1745 goto out; 1746 } 1747 memcpy(&iscsilun->bl, inq_bl, 1748 sizeof(struct scsi_inquiry_block_limits)); 1749 scsi_free_scsi_task(inq_task); 1750 break; 1751 default: 1752 break; 1753 } 1754 } 1755 scsi_free_scsi_task(task); 1756 task = NULL; 1757 1758 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1759 1760 /* Guess the internal cluster (page) size of the iscsi target by the means 1761 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1762 * reasonable size */ 1763 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1764 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1765 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1766 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1767 if (iscsilun->lbprz) { 1768 ret = iscsi_allocmap_init(iscsilun, bs->open_flags); 1769 } 1770 } 1771 1772 out: 1773 qemu_opts_del(opts); 1774 g_free(initiator_name); 1775 if (iscsi_url != NULL) { 1776 iscsi_destroy_url(iscsi_url); 1777 } 1778 if (task != NULL) { 1779 scsi_free_scsi_task(task); 1780 } 1781 1782 if (ret) { 1783 if (iscsi != NULL) { 1784 if (iscsi_is_logged_in(iscsi)) { 1785 iscsi_logout_sync(iscsi); 1786 } 1787 iscsi_destroy_context(iscsi); 1788 } 1789 memset(iscsilun, 0, sizeof(IscsiLun)); 1790 } 1791 return ret; 1792 } 1793 1794 static void iscsi_close(BlockDriverState *bs) 1795 { 1796 IscsiLun *iscsilun = bs->opaque; 1797 struct iscsi_context *iscsi = iscsilun->iscsi; 1798 1799 iscsi_detach_aio_context(bs); 1800 if (iscsi_is_logged_in(iscsi)) { 1801 iscsi_logout_sync(iscsi); 1802 } 1803 iscsi_destroy_context(iscsi); 1804 g_free(iscsilun->zeroblock); 1805 iscsi_allocmap_free(iscsilun); 1806 memset(iscsilun, 0, sizeof(IscsiLun)); 1807 } 1808 1809 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1810 { 1811 /* We don't actually refresh here, but just return data queried in 1812 * iscsi_open(): iscsi targets don't change their limits. */ 1813 1814 IscsiLun *iscsilun = bs->opaque; 1815 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff; 1816 1817 bs->bl.request_alignment = iscsilun->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 * iscsilun->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 / iscsilun->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 / iscsilun->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 / iscsilun->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