1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2014 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 "config-host.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 "trace.h" 38 #include "block/scsi.h" 39 #include "qemu/iov.h" 40 #include "sysemu/sysemu.h" 41 #include "qmp-commands.h" 42 43 #include <iscsi/iscsi.h> 44 #include <iscsi/scsi-lowlevel.h> 45 46 #ifdef __linux__ 47 #include <scsi/sg.h> 48 #include <block/scsi.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 uint8_t lbpme; 61 uint8_t lbprz; 62 uint8_t has_write_same; 63 struct scsi_inquiry_logical_block_provisioning lbp; 64 struct scsi_inquiry_block_limits bl; 65 unsigned char *zeroblock; 66 unsigned long *allocationmap; 67 int cluster_sectors; 68 bool use_16_for_rw; 69 } IscsiLun; 70 71 typedef struct IscsiTask { 72 int status; 73 int complete; 74 int retries; 75 int do_retry; 76 struct scsi_task *task; 77 Coroutine *co; 78 QEMUBH *bh; 79 IscsiLun *iscsilun; 80 QEMUTimer retry_timer; 81 } IscsiTask; 82 83 typedef struct IscsiAIOCB { 84 BlockDriverAIOCB common; 85 QEMUIOVector *qiov; 86 QEMUBH *bh; 87 IscsiLun *iscsilun; 88 struct scsi_task *task; 89 uint8_t *buf; 90 int status; 91 int canceled; 92 int64_t sector_num; 93 int nb_sectors; 94 #ifdef __linux__ 95 sg_io_hdr_t *ioh; 96 #endif 97 } IscsiAIOCB; 98 99 #define NOP_INTERVAL 5000 100 #define MAX_NOP_FAILURES 3 101 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times) 102 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048}; 103 104 /* this threshold is a trade-off knob to choose between 105 * the potential additional overhead of an extra GET_LBA_STATUS request 106 * vs. unnecessarily reading a lot of zero sectors over the wire. 107 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 108 * sectors we check the allocation status of the area covered by the 109 * request first if the allocationmap indicates that the area might be 110 * unallocated. */ 111 #define ISCSI_CHECKALLOC_THRES 64 112 113 static void 114 iscsi_bh_cb(void *p) 115 { 116 IscsiAIOCB *acb = p; 117 118 qemu_bh_delete(acb->bh); 119 120 g_free(acb->buf); 121 acb->buf = NULL; 122 123 if (acb->canceled == 0) { 124 acb->common.cb(acb->common.opaque, acb->status); 125 } 126 127 if (acb->task != NULL) { 128 scsi_free_scsi_task(acb->task); 129 acb->task = NULL; 130 } 131 132 qemu_aio_release(acb); 133 } 134 135 static void 136 iscsi_schedule_bh(IscsiAIOCB *acb) 137 { 138 if (acb->bh) { 139 return; 140 } 141 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb); 142 qemu_bh_schedule(acb->bh); 143 } 144 145 static void iscsi_co_generic_bh_cb(void *opaque) 146 { 147 struct IscsiTask *iTask = opaque; 148 iTask->complete = 1; 149 qemu_bh_delete(iTask->bh); 150 qemu_coroutine_enter(iTask->co, NULL); 151 } 152 153 static void iscsi_retry_timer_expired(void *opaque) 154 { 155 struct IscsiTask *iTask = opaque; 156 iTask->complete = 1; 157 if (iTask->co) { 158 qemu_coroutine_enter(iTask->co, NULL); 159 } 160 } 161 162 static inline unsigned exp_random(double mean) 163 { 164 return -mean * log((double)rand() / RAND_MAX); 165 } 166 167 static void 168 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 169 void *command_data, void *opaque) 170 { 171 struct IscsiTask *iTask = opaque; 172 struct scsi_task *task = command_data; 173 174 iTask->status = status; 175 iTask->do_retry = 0; 176 iTask->task = task; 177 178 if (status != SCSI_STATUS_GOOD) { 179 if (iTask->retries++ < ISCSI_CMD_RETRIES) { 180 if (status == SCSI_STATUS_CHECK_CONDITION 181 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 182 error_report("iSCSI CheckCondition: %s", 183 iscsi_get_error(iscsi)); 184 iTask->do_retry = 1; 185 goto out; 186 } 187 if (status == SCSI_STATUS_BUSY) { 188 unsigned retry_time = 189 exp_random(iscsi_retry_times[iTask->retries - 1]); 190 error_report("iSCSI Busy (retry #%u in %u ms): %s", 191 iTask->retries, retry_time, 192 iscsi_get_error(iscsi)); 193 aio_timer_init(iTask->iscsilun->aio_context, 194 &iTask->retry_timer, QEMU_CLOCK_REALTIME, 195 SCALE_MS, iscsi_retry_timer_expired, iTask); 196 timer_mod(&iTask->retry_timer, 197 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time); 198 iTask->do_retry = 1; 199 return; 200 } 201 } 202 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 203 } 204 205 out: 206 if (iTask->co) { 207 iTask->bh = aio_bh_new(iTask->iscsilun->aio_context, 208 iscsi_co_generic_bh_cb, iTask); 209 qemu_bh_schedule(iTask->bh); 210 } else { 211 iTask->complete = 1; 212 } 213 } 214 215 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 216 { 217 *iTask = (struct IscsiTask) { 218 .co = qemu_coroutine_self(), 219 .iscsilun = iscsilun, 220 }; 221 } 222 223 static void 224 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 225 void *private_data) 226 { 227 IscsiAIOCB *acb = private_data; 228 229 acb->status = -ECANCELED; 230 iscsi_schedule_bh(acb); 231 } 232 233 static void 234 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 235 { 236 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 237 IscsiLun *iscsilun = acb->iscsilun; 238 239 if (acb->status != -EINPROGRESS) { 240 return; 241 } 242 243 acb->canceled = 1; 244 245 /* send a task mgmt call to the target to cancel the task on the target */ 246 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 247 iscsi_abort_task_cb, acb); 248 249 while (acb->status == -EINPROGRESS) { 250 aio_poll(iscsilun->aio_context, true); 251 } 252 } 253 254 static const AIOCBInfo iscsi_aiocb_info = { 255 .aiocb_size = sizeof(IscsiAIOCB), 256 .cancel = iscsi_aio_cancel, 257 }; 258 259 260 static void iscsi_process_read(void *arg); 261 static void iscsi_process_write(void *arg); 262 263 static void 264 iscsi_set_events(IscsiLun *iscsilun) 265 { 266 struct iscsi_context *iscsi = iscsilun->iscsi; 267 int ev; 268 269 /* We always register a read handler. */ 270 ev = POLLIN; 271 ev |= iscsi_which_events(iscsi); 272 if (ev != iscsilun->events) { 273 aio_set_fd_handler(iscsilun->aio_context, 274 iscsi_get_fd(iscsi), 275 iscsi_process_read, 276 (ev & POLLOUT) ? iscsi_process_write : NULL, 277 iscsilun); 278 279 } 280 281 iscsilun->events = ev; 282 } 283 284 static void 285 iscsi_process_read(void *arg) 286 { 287 IscsiLun *iscsilun = arg; 288 struct iscsi_context *iscsi = iscsilun->iscsi; 289 290 iscsi_service(iscsi, POLLIN); 291 iscsi_set_events(iscsilun); 292 } 293 294 static void 295 iscsi_process_write(void *arg) 296 { 297 IscsiLun *iscsilun = arg; 298 struct iscsi_context *iscsi = iscsilun->iscsi; 299 300 iscsi_service(iscsi, POLLOUT); 301 iscsi_set_events(iscsilun); 302 } 303 304 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 305 { 306 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 307 } 308 309 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 310 { 311 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 312 } 313 314 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 315 IscsiLun *iscsilun) 316 { 317 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 318 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 319 error_report("iSCSI misaligned request: " 320 "iscsilun->block_size %u, sector_num %" PRIi64 321 ", nb_sectors %d", 322 iscsilun->block_size, sector_num, nb_sectors); 323 return 0; 324 } 325 return 1; 326 } 327 328 static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num, 329 int nb_sectors) 330 { 331 if (iscsilun->allocationmap == NULL) { 332 return; 333 } 334 bitmap_set(iscsilun->allocationmap, 335 sector_num / iscsilun->cluster_sectors, 336 DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors)); 337 } 338 339 static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num, 340 int nb_sectors) 341 { 342 int64_t cluster_num, nb_clusters; 343 if (iscsilun->allocationmap == NULL) { 344 return; 345 } 346 cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 347 nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors 348 - cluster_num; 349 if (nb_clusters > 0) { 350 bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters); 351 } 352 } 353 354 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs, 355 int64_t sector_num, int nb_sectors, 356 QEMUIOVector *iov) 357 { 358 IscsiLun *iscsilun = bs->opaque; 359 struct IscsiTask iTask; 360 uint64_t lba; 361 uint32_t num_sectors; 362 363 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 364 return -EINVAL; 365 } 366 367 lba = sector_qemu2lun(sector_num, iscsilun); 368 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 369 iscsi_co_init_iscsitask(iscsilun, &iTask); 370 retry: 371 if (iscsilun->use_16_for_rw) { 372 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 373 NULL, num_sectors * iscsilun->block_size, 374 iscsilun->block_size, 0, 0, 0, 0, 0, 375 iscsi_co_generic_cb, &iTask); 376 } else { 377 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba, 378 NULL, num_sectors * iscsilun->block_size, 379 iscsilun->block_size, 0, 0, 0, 0, 0, 380 iscsi_co_generic_cb, &iTask); 381 } 382 if (iTask.task == NULL) { 383 return -ENOMEM; 384 } 385 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 386 iov->niov); 387 while (!iTask.complete) { 388 iscsi_set_events(iscsilun); 389 qemu_coroutine_yield(); 390 } 391 392 if (iTask.task != NULL) { 393 scsi_free_scsi_task(iTask.task); 394 iTask.task = NULL; 395 } 396 397 if (iTask.do_retry) { 398 iTask.complete = 0; 399 goto retry; 400 } 401 402 if (iTask.status != SCSI_STATUS_GOOD) { 403 return -EIO; 404 } 405 406 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 407 408 return 0; 409 } 410 411 412 static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun, 413 int64_t sector_num, int nb_sectors) 414 { 415 unsigned long size; 416 if (iscsilun->allocationmap == NULL) { 417 return true; 418 } 419 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 420 return !(find_next_bit(iscsilun->allocationmap, size, 421 sector_num / iscsilun->cluster_sectors) == size); 422 } 423 424 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 425 int64_t sector_num, 426 int nb_sectors, int *pnum) 427 { 428 IscsiLun *iscsilun = bs->opaque; 429 struct scsi_get_lba_status *lbas = NULL; 430 struct scsi_lba_status_descriptor *lbasd = NULL; 431 struct IscsiTask iTask; 432 int64_t ret; 433 434 iscsi_co_init_iscsitask(iscsilun, &iTask); 435 436 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 437 ret = -EINVAL; 438 goto out; 439 } 440 441 /* default to all sectors allocated */ 442 ret = BDRV_BLOCK_DATA; 443 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 444 *pnum = nb_sectors; 445 446 /* LUN does not support logical block provisioning */ 447 if (iscsilun->lbpme == 0) { 448 goto out; 449 } 450 451 retry: 452 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 453 sector_qemu2lun(sector_num, iscsilun), 454 8 + 16, iscsi_co_generic_cb, 455 &iTask) == NULL) { 456 ret = -ENOMEM; 457 goto out; 458 } 459 460 while (!iTask.complete) { 461 iscsi_set_events(iscsilun); 462 qemu_coroutine_yield(); 463 } 464 465 if (iTask.do_retry) { 466 if (iTask.task != NULL) { 467 scsi_free_scsi_task(iTask.task); 468 iTask.task = NULL; 469 } 470 iTask.complete = 0; 471 goto retry; 472 } 473 474 if (iTask.status != SCSI_STATUS_GOOD) { 475 /* in case the get_lba_status_callout fails (i.e. 476 * because the device is busy or the cmd is not 477 * supported) we pretend all blocks are allocated 478 * for backwards compatibility */ 479 goto out; 480 } 481 482 lbas = scsi_datain_unmarshall(iTask.task); 483 if (lbas == NULL) { 484 ret = -EIO; 485 goto out; 486 } 487 488 lbasd = &lbas->descriptors[0]; 489 490 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 491 ret = -EIO; 492 goto out; 493 } 494 495 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 496 497 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 498 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 499 ret &= ~BDRV_BLOCK_DATA; 500 if (iscsilun->lbprz) { 501 ret |= BDRV_BLOCK_ZERO; 502 } 503 } 504 505 if (ret & BDRV_BLOCK_ZERO) { 506 iscsi_allocationmap_clear(iscsilun, sector_num, *pnum); 507 } else { 508 iscsi_allocationmap_set(iscsilun, sector_num, *pnum); 509 } 510 511 if (*pnum > nb_sectors) { 512 *pnum = nb_sectors; 513 } 514 out: 515 if (iTask.task != NULL) { 516 scsi_free_scsi_task(iTask.task); 517 } 518 return ret; 519 } 520 521 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 522 int64_t sector_num, int nb_sectors, 523 QEMUIOVector *iov) 524 { 525 IscsiLun *iscsilun = bs->opaque; 526 struct IscsiTask iTask; 527 uint64_t lba; 528 uint32_t num_sectors; 529 530 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 531 return -EINVAL; 532 } 533 534 if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES && 535 !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 536 int64_t ret; 537 int pnum; 538 ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum); 539 if (ret < 0) { 540 return ret; 541 } 542 if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) { 543 qemu_iovec_memset(iov, 0, 0x00, iov->size); 544 return 0; 545 } 546 } 547 548 lba = sector_qemu2lun(sector_num, iscsilun); 549 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 550 551 iscsi_co_init_iscsitask(iscsilun, &iTask); 552 retry: 553 if (iscsilun->use_16_for_rw) { 554 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 555 num_sectors * iscsilun->block_size, 556 iscsilun->block_size, 0, 0, 0, 0, 0, 557 iscsi_co_generic_cb, &iTask); 558 } else { 559 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 560 num_sectors * iscsilun->block_size, 561 iscsilun->block_size, 562 0, 0, 0, 0, 0, 563 iscsi_co_generic_cb, &iTask); 564 } 565 if (iTask.task == NULL) { 566 return -ENOMEM; 567 } 568 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 569 570 while (!iTask.complete) { 571 iscsi_set_events(iscsilun); 572 qemu_coroutine_yield(); 573 } 574 575 if (iTask.task != NULL) { 576 scsi_free_scsi_task(iTask.task); 577 iTask.task = NULL; 578 } 579 580 if (iTask.do_retry) { 581 iTask.complete = 0; 582 goto retry; 583 } 584 585 if (iTask.status != SCSI_STATUS_GOOD) { 586 return -EIO; 587 } 588 589 return 0; 590 } 591 592 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 593 { 594 IscsiLun *iscsilun = bs->opaque; 595 struct IscsiTask iTask; 596 597 if (bs->sg) { 598 return 0; 599 } 600 601 iscsi_co_init_iscsitask(iscsilun, &iTask); 602 603 retry: 604 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 605 0, iscsi_co_generic_cb, &iTask) == NULL) { 606 return -ENOMEM; 607 } 608 609 while (!iTask.complete) { 610 iscsi_set_events(iscsilun); 611 qemu_coroutine_yield(); 612 } 613 614 if (iTask.task != NULL) { 615 scsi_free_scsi_task(iTask.task); 616 iTask.task = NULL; 617 } 618 619 if (iTask.do_retry) { 620 iTask.complete = 0; 621 goto retry; 622 } 623 624 if (iTask.status != SCSI_STATUS_GOOD) { 625 return -EIO; 626 } 627 628 return 0; 629 } 630 631 #ifdef __linux__ 632 static void 633 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 634 void *command_data, void *opaque) 635 { 636 IscsiAIOCB *acb = opaque; 637 638 g_free(acb->buf); 639 acb->buf = NULL; 640 641 if (acb->canceled != 0) { 642 return; 643 } 644 645 acb->status = 0; 646 if (status < 0) { 647 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 648 iscsi_get_error(iscsi)); 649 acb->status = -EIO; 650 } 651 652 acb->ioh->driver_status = 0; 653 acb->ioh->host_status = 0; 654 acb->ioh->resid = 0; 655 656 #define SG_ERR_DRIVER_SENSE 0x08 657 658 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 659 int ss; 660 661 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 662 663 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 664 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 665 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 666 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 667 } 668 669 iscsi_schedule_bh(acb); 670 } 671 672 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 673 unsigned long int req, void *buf, 674 BlockDriverCompletionFunc *cb, void *opaque) 675 { 676 IscsiLun *iscsilun = bs->opaque; 677 struct iscsi_context *iscsi = iscsilun->iscsi; 678 struct iscsi_data data; 679 IscsiAIOCB *acb; 680 681 assert(req == SG_IO); 682 683 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 684 685 acb->iscsilun = iscsilun; 686 acb->canceled = 0; 687 acb->bh = NULL; 688 acb->status = -EINPROGRESS; 689 acb->buf = NULL; 690 acb->ioh = buf; 691 692 acb->task = malloc(sizeof(struct scsi_task)); 693 if (acb->task == NULL) { 694 error_report("iSCSI: Failed to allocate task for scsi command. %s", 695 iscsi_get_error(iscsi)); 696 qemu_aio_release(acb); 697 return NULL; 698 } 699 memset(acb->task, 0, sizeof(struct scsi_task)); 700 701 switch (acb->ioh->dxfer_direction) { 702 case SG_DXFER_TO_DEV: 703 acb->task->xfer_dir = SCSI_XFER_WRITE; 704 break; 705 case SG_DXFER_FROM_DEV: 706 acb->task->xfer_dir = SCSI_XFER_READ; 707 break; 708 default: 709 acb->task->xfer_dir = SCSI_XFER_NONE; 710 break; 711 } 712 713 acb->task->cdb_size = acb->ioh->cmd_len; 714 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 715 acb->task->expxferlen = acb->ioh->dxfer_len; 716 717 data.size = 0; 718 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 719 if (acb->ioh->iovec_count == 0) { 720 data.data = acb->ioh->dxferp; 721 data.size = acb->ioh->dxfer_len; 722 } else { 723 scsi_task_set_iov_out(acb->task, 724 (struct scsi_iovec *) acb->ioh->dxferp, 725 acb->ioh->iovec_count); 726 } 727 } 728 729 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 730 iscsi_aio_ioctl_cb, 731 (data.size > 0) ? &data : NULL, 732 acb) != 0) { 733 scsi_free_scsi_task(acb->task); 734 qemu_aio_release(acb); 735 return NULL; 736 } 737 738 /* tell libiscsi to read straight into the buffer we got from ioctl */ 739 if (acb->task->xfer_dir == SCSI_XFER_READ) { 740 if (acb->ioh->iovec_count == 0) { 741 scsi_task_add_data_in_buffer(acb->task, 742 acb->ioh->dxfer_len, 743 acb->ioh->dxferp); 744 } else { 745 scsi_task_set_iov_in(acb->task, 746 (struct scsi_iovec *) acb->ioh->dxferp, 747 acb->ioh->iovec_count); 748 } 749 } 750 751 iscsi_set_events(iscsilun); 752 753 return &acb->common; 754 } 755 756 static void ioctl_cb(void *opaque, int status) 757 { 758 int *p_status = opaque; 759 *p_status = status; 760 } 761 762 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 763 { 764 IscsiLun *iscsilun = bs->opaque; 765 int status; 766 767 switch (req) { 768 case SG_GET_VERSION_NUM: 769 *(int *)buf = 30000; 770 break; 771 case SG_GET_SCSI_ID: 772 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 773 break; 774 case SG_IO: 775 status = -EINPROGRESS; 776 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 777 778 while (status == -EINPROGRESS) { 779 aio_poll(iscsilun->aio_context, true); 780 } 781 782 return 0; 783 default: 784 return -1; 785 } 786 return 0; 787 } 788 #endif 789 790 static int64_t 791 iscsi_getlength(BlockDriverState *bs) 792 { 793 IscsiLun *iscsilun = bs->opaque; 794 int64_t len; 795 796 len = iscsilun->num_blocks; 797 len *= iscsilun->block_size; 798 799 return len; 800 } 801 802 static int 803 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 804 int nb_sectors) 805 { 806 IscsiLun *iscsilun = bs->opaque; 807 struct IscsiTask iTask; 808 struct unmap_list list; 809 810 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 811 return -EINVAL; 812 } 813 814 if (!iscsilun->lbp.lbpu) { 815 /* UNMAP is not supported by the target */ 816 return 0; 817 } 818 819 list.lba = sector_qemu2lun(sector_num, iscsilun); 820 list.num = sector_qemu2lun(nb_sectors, iscsilun); 821 822 iscsi_co_init_iscsitask(iscsilun, &iTask); 823 retry: 824 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 825 iscsi_co_generic_cb, &iTask) == NULL) { 826 return -ENOMEM; 827 } 828 829 while (!iTask.complete) { 830 iscsi_set_events(iscsilun); 831 qemu_coroutine_yield(); 832 } 833 834 if (iTask.task != NULL) { 835 scsi_free_scsi_task(iTask.task); 836 iTask.task = NULL; 837 } 838 839 if (iTask.do_retry) { 840 iTask.complete = 0; 841 goto retry; 842 } 843 844 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 845 /* the target might fail with a check condition if it 846 is not happy with the alignment of the UNMAP request 847 we silently fail in this case */ 848 return 0; 849 } 850 851 if (iTask.status != SCSI_STATUS_GOOD) { 852 return -EIO; 853 } 854 855 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 856 857 return 0; 858 } 859 860 static int 861 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 862 int nb_sectors, BdrvRequestFlags flags) 863 { 864 IscsiLun *iscsilun = bs->opaque; 865 struct IscsiTask iTask; 866 uint64_t lba; 867 uint32_t nb_blocks; 868 bool use_16_for_ws = iscsilun->use_16_for_rw; 869 870 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 871 return -EINVAL; 872 } 873 874 if (flags & BDRV_REQ_MAY_UNMAP) { 875 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) { 876 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */ 877 use_16_for_ws = true; 878 } 879 if (use_16_for_ws && !iscsilun->lbp.lbpws) { 880 /* WRITESAME16 with UNMAP is not supported by the target, 881 * fall back and try WRITESAME10/16 without UNMAP */ 882 flags &= ~BDRV_REQ_MAY_UNMAP; 883 use_16_for_ws = iscsilun->use_16_for_rw; 884 } 885 } 886 887 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 888 /* WRITESAME without UNMAP is not supported by the target */ 889 return -ENOTSUP; 890 } 891 892 lba = sector_qemu2lun(sector_num, iscsilun); 893 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 894 895 if (iscsilun->zeroblock == NULL) { 896 iscsilun->zeroblock = g_malloc0(iscsilun->block_size); 897 } 898 899 iscsi_co_init_iscsitask(iscsilun, &iTask); 900 retry: 901 if (use_16_for_ws) { 902 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 903 iscsilun->zeroblock, iscsilun->block_size, 904 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 905 0, 0, iscsi_co_generic_cb, &iTask); 906 } else { 907 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba, 908 iscsilun->zeroblock, iscsilun->block_size, 909 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 910 0, 0, iscsi_co_generic_cb, &iTask); 911 } 912 if (iTask.task == NULL) { 913 return -ENOMEM; 914 } 915 916 while (!iTask.complete) { 917 iscsi_set_events(iscsilun); 918 qemu_coroutine_yield(); 919 } 920 921 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 922 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 923 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 924 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 925 /* WRITE SAME is not supported by the target */ 926 iscsilun->has_write_same = false; 927 scsi_free_scsi_task(iTask.task); 928 return -ENOTSUP; 929 } 930 931 if (iTask.task != NULL) { 932 scsi_free_scsi_task(iTask.task); 933 iTask.task = NULL; 934 } 935 936 if (iTask.do_retry) { 937 iTask.complete = 0; 938 goto retry; 939 } 940 941 if (iTask.status != SCSI_STATUS_GOOD) { 942 return -EIO; 943 } 944 945 if (flags & BDRV_REQ_MAY_UNMAP) { 946 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 947 } else { 948 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 949 } 950 951 return 0; 952 } 953 954 static void parse_chap(struct iscsi_context *iscsi, const char *target, 955 Error **errp) 956 { 957 QemuOptsList *list; 958 QemuOpts *opts; 959 const char *user = NULL; 960 const char *password = NULL; 961 962 list = qemu_find_opts("iscsi"); 963 if (!list) { 964 return; 965 } 966 967 opts = qemu_opts_find(list, target); 968 if (opts == NULL) { 969 opts = QTAILQ_FIRST(&list->head); 970 if (!opts) { 971 return; 972 } 973 } 974 975 user = qemu_opt_get(opts, "user"); 976 if (!user) { 977 return; 978 } 979 980 password = qemu_opt_get(opts, "password"); 981 if (!password) { 982 error_setg(errp, "CHAP username specified but no password was given"); 983 return; 984 } 985 986 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 987 error_setg(errp, "Failed to set initiator username and password"); 988 } 989 } 990 991 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 992 Error **errp) 993 { 994 QemuOptsList *list; 995 QemuOpts *opts; 996 const char *digest = NULL; 997 998 list = qemu_find_opts("iscsi"); 999 if (!list) { 1000 return; 1001 } 1002 1003 opts = qemu_opts_find(list, target); 1004 if (opts == NULL) { 1005 opts = QTAILQ_FIRST(&list->head); 1006 if (!opts) { 1007 return; 1008 } 1009 } 1010 1011 digest = qemu_opt_get(opts, "header-digest"); 1012 if (!digest) { 1013 return; 1014 } 1015 1016 if (!strcmp(digest, "CRC32C")) { 1017 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1018 } else if (!strcmp(digest, "NONE")) { 1019 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1020 } else if (!strcmp(digest, "CRC32C-NONE")) { 1021 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1022 } else if (!strcmp(digest, "NONE-CRC32C")) { 1023 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1024 } else { 1025 error_setg(errp, "Invalid header-digest setting : %s", digest); 1026 } 1027 } 1028 1029 static char *parse_initiator_name(const char *target) 1030 { 1031 QemuOptsList *list; 1032 QemuOpts *opts; 1033 const char *name; 1034 char *iscsi_name; 1035 UuidInfo *uuid_info; 1036 1037 list = qemu_find_opts("iscsi"); 1038 if (list) { 1039 opts = qemu_opts_find(list, target); 1040 if (!opts) { 1041 opts = QTAILQ_FIRST(&list->head); 1042 } 1043 if (opts) { 1044 name = qemu_opt_get(opts, "initiator-name"); 1045 if (name) { 1046 return g_strdup(name); 1047 } 1048 } 1049 } 1050 1051 uuid_info = qmp_query_uuid(NULL); 1052 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1053 name = qemu_get_vm_name(); 1054 } else { 1055 name = uuid_info->UUID; 1056 } 1057 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1058 name ? ":" : "", name ? name : ""); 1059 qapi_free_UuidInfo(uuid_info); 1060 return iscsi_name; 1061 } 1062 1063 static void iscsi_nop_timed_event(void *opaque) 1064 { 1065 IscsiLun *iscsilun = opaque; 1066 1067 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 1068 error_report("iSCSI: NOP timeout. Reconnecting..."); 1069 iscsi_reconnect(iscsilun->iscsi); 1070 } 1071 1072 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1073 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1074 return; 1075 } 1076 1077 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1078 iscsi_set_events(iscsilun); 1079 } 1080 1081 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1082 { 1083 struct scsi_task *task = NULL; 1084 struct scsi_readcapacity10 *rc10 = NULL; 1085 struct scsi_readcapacity16 *rc16 = NULL; 1086 int retries = ISCSI_CMD_RETRIES; 1087 1088 do { 1089 if (task != NULL) { 1090 scsi_free_scsi_task(task); 1091 task = NULL; 1092 } 1093 1094 switch (iscsilun->type) { 1095 case TYPE_DISK: 1096 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1097 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1098 rc16 = scsi_datain_unmarshall(task); 1099 if (rc16 == NULL) { 1100 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1101 } else { 1102 iscsilun->block_size = rc16->block_length; 1103 iscsilun->num_blocks = rc16->returned_lba + 1; 1104 iscsilun->lbpme = rc16->lbpme; 1105 iscsilun->lbprz = rc16->lbprz; 1106 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff); 1107 } 1108 } 1109 break; 1110 case TYPE_ROM: 1111 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1112 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1113 rc10 = scsi_datain_unmarshall(task); 1114 if (rc10 == NULL) { 1115 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1116 } else { 1117 iscsilun->block_size = rc10->block_size; 1118 if (rc10->lba == 0) { 1119 /* blank disk loaded */ 1120 iscsilun->num_blocks = 0; 1121 } else { 1122 iscsilun->num_blocks = rc10->lba + 1; 1123 } 1124 } 1125 } 1126 break; 1127 default: 1128 return; 1129 } 1130 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1131 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1132 && retries-- > 0); 1133 1134 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1135 error_setg(errp, "iSCSI: failed to send readcapacity10 command."); 1136 } 1137 if (task) { 1138 scsi_free_scsi_task(task); 1139 } 1140 } 1141 1142 /* TODO Convert to fine grained options */ 1143 static QemuOptsList runtime_opts = { 1144 .name = "iscsi", 1145 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1146 .desc = { 1147 { 1148 .name = "filename", 1149 .type = QEMU_OPT_STRING, 1150 .help = "URL to the iscsi image", 1151 }, 1152 { /* end of list */ } 1153 }, 1154 }; 1155 1156 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1157 int evpd, int pc, void **inq, Error **errp) 1158 { 1159 int full_size; 1160 struct scsi_task *task = NULL; 1161 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1162 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1163 goto fail; 1164 } 1165 full_size = scsi_datain_getfullsize(task); 1166 if (full_size > task->datain.size) { 1167 scsi_free_scsi_task(task); 1168 1169 /* we need more data for the full list */ 1170 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1171 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1172 goto fail; 1173 } 1174 } 1175 1176 *inq = scsi_datain_unmarshall(task); 1177 if (*inq == NULL) { 1178 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1179 goto fail_with_err; 1180 } 1181 1182 return task; 1183 1184 fail: 1185 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1186 iscsi_get_error(iscsi)); 1187 fail_with_err: 1188 if (task != NULL) { 1189 scsi_free_scsi_task(task); 1190 } 1191 return NULL; 1192 } 1193 1194 static void iscsi_detach_aio_context(BlockDriverState *bs) 1195 { 1196 IscsiLun *iscsilun = bs->opaque; 1197 1198 aio_set_fd_handler(iscsilun->aio_context, 1199 iscsi_get_fd(iscsilun->iscsi), 1200 NULL, NULL, NULL); 1201 iscsilun->events = 0; 1202 1203 if (iscsilun->nop_timer) { 1204 timer_del(iscsilun->nop_timer); 1205 timer_free(iscsilun->nop_timer); 1206 iscsilun->nop_timer = NULL; 1207 } 1208 } 1209 1210 static void iscsi_attach_aio_context(BlockDriverState *bs, 1211 AioContext *new_context) 1212 { 1213 IscsiLun *iscsilun = bs->opaque; 1214 1215 iscsilun->aio_context = new_context; 1216 iscsi_set_events(iscsilun); 1217 1218 /* Set up a timer for sending out iSCSI NOPs */ 1219 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context, 1220 QEMU_CLOCK_REALTIME, SCALE_MS, 1221 iscsi_nop_timed_event, iscsilun); 1222 timer_mod(iscsilun->nop_timer, 1223 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1224 } 1225 1226 /* 1227 * We support iscsi url's on the form 1228 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1229 * 1230 * Note: flags are currently not used by iscsi_open. If this function 1231 * is changed such that flags are used, please examine iscsi_reopen_prepare() 1232 * to see if needs to be changed as well. 1233 */ 1234 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1235 Error **errp) 1236 { 1237 IscsiLun *iscsilun = bs->opaque; 1238 struct iscsi_context *iscsi = NULL; 1239 struct iscsi_url *iscsi_url = NULL; 1240 struct scsi_task *task = NULL; 1241 struct scsi_inquiry_standard *inq = NULL; 1242 struct scsi_inquiry_supported_pages *inq_vpd; 1243 char *initiator_name = NULL; 1244 QemuOpts *opts; 1245 Error *local_err = NULL; 1246 const char *filename; 1247 int i, ret; 1248 1249 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1250 error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. " 1251 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1252 "of 512", BDRV_SECTOR_SIZE); 1253 return -EINVAL; 1254 } 1255 1256 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1257 qemu_opts_absorb_qdict(opts, options, &local_err); 1258 if (local_err) { 1259 error_propagate(errp, local_err); 1260 ret = -EINVAL; 1261 goto out; 1262 } 1263 1264 filename = qemu_opt_get(opts, "filename"); 1265 1266 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1267 if (iscsi_url == NULL) { 1268 error_setg(errp, "Failed to parse URL : %s", filename); 1269 ret = -EINVAL; 1270 goto out; 1271 } 1272 1273 memset(iscsilun, 0, sizeof(IscsiLun)); 1274 1275 initiator_name = parse_initiator_name(iscsi_url->target); 1276 1277 iscsi = iscsi_create_context(initiator_name); 1278 if (iscsi == NULL) { 1279 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1280 ret = -ENOMEM; 1281 goto out; 1282 } 1283 1284 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1285 error_setg(errp, "iSCSI: Failed to set target name."); 1286 ret = -EINVAL; 1287 goto out; 1288 } 1289 1290 if (iscsi_url->user != NULL) { 1291 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1292 iscsi_url->passwd); 1293 if (ret != 0) { 1294 error_setg(errp, "Failed to set initiator username and password"); 1295 ret = -EINVAL; 1296 goto out; 1297 } 1298 } 1299 1300 /* check if we got CHAP username/password via the options */ 1301 parse_chap(iscsi, iscsi_url->target, &local_err); 1302 if (local_err != NULL) { 1303 error_propagate(errp, local_err); 1304 ret = -EINVAL; 1305 goto out; 1306 } 1307 1308 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1309 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1310 ret = -EINVAL; 1311 goto out; 1312 } 1313 1314 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1315 1316 /* check if we got HEADER_DIGEST via the options */ 1317 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1318 if (local_err != NULL) { 1319 error_propagate(errp, local_err); 1320 ret = -EINVAL; 1321 goto out; 1322 } 1323 1324 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1325 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1326 iscsi_get_error(iscsi)); 1327 ret = -EINVAL; 1328 goto out; 1329 } 1330 1331 iscsilun->iscsi = iscsi; 1332 iscsilun->aio_context = bdrv_get_aio_context(bs); 1333 iscsilun->lun = iscsi_url->lun; 1334 iscsilun->has_write_same = true; 1335 1336 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1337 (void **) &inq, errp); 1338 if (task == NULL) { 1339 ret = -EINVAL; 1340 goto out; 1341 } 1342 iscsilun->type = inq->periperal_device_type; 1343 scsi_free_scsi_task(task); 1344 task = NULL; 1345 1346 iscsi_readcapacity_sync(iscsilun, &local_err); 1347 if (local_err != NULL) { 1348 error_propagate(errp, local_err); 1349 ret = -EINVAL; 1350 goto out; 1351 } 1352 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1353 bs->request_alignment = iscsilun->block_size; 1354 1355 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1356 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1357 * will try to read from the device to guess the image format. 1358 */ 1359 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1360 bs->sg = 1; 1361 } 1362 1363 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1364 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1365 (void **) &inq_vpd, errp); 1366 if (task == NULL) { 1367 ret = -EINVAL; 1368 goto out; 1369 } 1370 for (i = 0; i < inq_vpd->num_pages; i++) { 1371 struct scsi_task *inq_task; 1372 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1373 struct scsi_inquiry_block_limits *inq_bl; 1374 switch (inq_vpd->pages[i]) { 1375 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1376 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1377 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1378 (void **) &inq_lbp, errp); 1379 if (inq_task == NULL) { 1380 ret = -EINVAL; 1381 goto out; 1382 } 1383 memcpy(&iscsilun->lbp, inq_lbp, 1384 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1385 scsi_free_scsi_task(inq_task); 1386 break; 1387 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1388 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1389 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1390 (void **) &inq_bl, errp); 1391 if (inq_task == NULL) { 1392 ret = -EINVAL; 1393 goto out; 1394 } 1395 memcpy(&iscsilun->bl, inq_bl, 1396 sizeof(struct scsi_inquiry_block_limits)); 1397 scsi_free_scsi_task(inq_task); 1398 break; 1399 default: 1400 break; 1401 } 1402 } 1403 scsi_free_scsi_task(task); 1404 task = NULL; 1405 1406 iscsi_attach_aio_context(bs, iscsilun->aio_context); 1407 1408 /* Guess the internal cluster (page) size of the iscsi target by the means 1409 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1410 * reasonable size */ 1411 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1412 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1413 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1414 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1415 if (iscsilun->lbprz && !(bs->open_flags & BDRV_O_NOCACHE)) { 1416 iscsilun->allocationmap = 1417 bitmap_new(DIV_ROUND_UP(bs->total_sectors, 1418 iscsilun->cluster_sectors)); 1419 } 1420 } 1421 1422 out: 1423 qemu_opts_del(opts); 1424 g_free(initiator_name); 1425 if (iscsi_url != NULL) { 1426 iscsi_destroy_url(iscsi_url); 1427 } 1428 if (task != NULL) { 1429 scsi_free_scsi_task(task); 1430 } 1431 1432 if (ret) { 1433 if (iscsi != NULL) { 1434 iscsi_destroy_context(iscsi); 1435 } 1436 memset(iscsilun, 0, sizeof(IscsiLun)); 1437 } 1438 return ret; 1439 } 1440 1441 static void iscsi_close(BlockDriverState *bs) 1442 { 1443 IscsiLun *iscsilun = bs->opaque; 1444 struct iscsi_context *iscsi = iscsilun->iscsi; 1445 1446 iscsi_detach_aio_context(bs); 1447 iscsi_destroy_context(iscsi); 1448 g_free(iscsilun->zeroblock); 1449 g_free(iscsilun->allocationmap); 1450 memset(iscsilun, 0, sizeof(IscsiLun)); 1451 } 1452 1453 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) 1454 { 1455 IscsiLun *iscsilun = bs->opaque; 1456 1457 /* We don't actually refresh here, but just return data queried in 1458 * iscsi_open(): iscsi targets don't change their limits. */ 1459 if (iscsilun->lbp.lbpu) { 1460 if (iscsilun->bl.max_unmap < 0xffffffff) { 1461 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1462 iscsilun); 1463 } 1464 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1465 iscsilun); 1466 } 1467 1468 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1469 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1470 iscsilun); 1471 } 1472 if (iscsilun->lbp.lbpws) { 1473 bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1474 iscsilun); 1475 } 1476 bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len, 1477 iscsilun); 1478 } 1479 1480 /* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in 1481 * prepare. Note that this will not re-establish a connection with an iSCSI 1482 * target - it is effectively a NOP. */ 1483 static int iscsi_reopen_prepare(BDRVReopenState *state, 1484 BlockReopenQueue *queue, Error **errp) 1485 { 1486 /* NOP */ 1487 return 0; 1488 } 1489 1490 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1491 { 1492 IscsiLun *iscsilun = bs->opaque; 1493 Error *local_err = NULL; 1494 1495 if (iscsilun->type != TYPE_DISK) { 1496 return -ENOTSUP; 1497 } 1498 1499 iscsi_readcapacity_sync(iscsilun, &local_err); 1500 if (local_err != NULL) { 1501 error_free(local_err); 1502 return -EIO; 1503 } 1504 1505 if (offset > iscsi_getlength(bs)) { 1506 return -EINVAL; 1507 } 1508 1509 if (iscsilun->allocationmap != NULL) { 1510 g_free(iscsilun->allocationmap); 1511 iscsilun->allocationmap = 1512 bitmap_new(DIV_ROUND_UP(bs->total_sectors, 1513 iscsilun->cluster_sectors)); 1514 } 1515 1516 return 0; 1517 } 1518 1519 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp) 1520 { 1521 int ret = 0; 1522 int64_t total_size = 0; 1523 BlockDriverState *bs; 1524 IscsiLun *iscsilun = NULL; 1525 QDict *bs_options; 1526 1527 bs = bdrv_new("", &error_abort); 1528 1529 /* Read out options */ 1530 total_size = 1531 qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0) / BDRV_SECTOR_SIZE; 1532 bs->opaque = g_malloc0(sizeof(struct IscsiLun)); 1533 iscsilun = bs->opaque; 1534 1535 bs_options = qdict_new(); 1536 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1537 ret = iscsi_open(bs, bs_options, 0, NULL); 1538 QDECREF(bs_options); 1539 1540 if (ret != 0) { 1541 goto out; 1542 } 1543 iscsi_detach_aio_context(bs); 1544 if (iscsilun->type != TYPE_DISK) { 1545 ret = -ENODEV; 1546 goto out; 1547 } 1548 if (bs->total_sectors < total_size) { 1549 ret = -ENOSPC; 1550 goto out; 1551 } 1552 1553 ret = 0; 1554 out: 1555 if (iscsilun->iscsi != NULL) { 1556 iscsi_destroy_context(iscsilun->iscsi); 1557 } 1558 g_free(bs->opaque); 1559 bs->opaque = NULL; 1560 bdrv_unref(bs); 1561 return ret; 1562 } 1563 1564 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1565 { 1566 IscsiLun *iscsilun = bs->opaque; 1567 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1568 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1569 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 1570 return 0; 1571 } 1572 1573 static QemuOptsList iscsi_create_opts = { 1574 .name = "iscsi-create-opts", 1575 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head), 1576 .desc = { 1577 { 1578 .name = BLOCK_OPT_SIZE, 1579 .type = QEMU_OPT_SIZE, 1580 .help = "Virtual disk size" 1581 }, 1582 { /* end of list */ } 1583 } 1584 }; 1585 1586 static BlockDriver bdrv_iscsi = { 1587 .format_name = "iscsi", 1588 .protocol_name = "iscsi", 1589 1590 .instance_size = sizeof(IscsiLun), 1591 .bdrv_needs_filename = true, 1592 .bdrv_file_open = iscsi_open, 1593 .bdrv_close = iscsi_close, 1594 .bdrv_create = iscsi_create, 1595 .create_opts = &iscsi_create_opts, 1596 .bdrv_reopen_prepare = iscsi_reopen_prepare, 1597 1598 .bdrv_getlength = iscsi_getlength, 1599 .bdrv_get_info = iscsi_get_info, 1600 .bdrv_truncate = iscsi_truncate, 1601 .bdrv_refresh_limits = iscsi_refresh_limits, 1602 1603 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1604 .bdrv_co_discard = iscsi_co_discard, 1605 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1606 .bdrv_co_readv = iscsi_co_readv, 1607 .bdrv_co_writev = iscsi_co_writev, 1608 .bdrv_co_flush_to_disk = iscsi_co_flush, 1609 1610 #ifdef __linux__ 1611 .bdrv_ioctl = iscsi_ioctl, 1612 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1613 #endif 1614 1615 .bdrv_detach_aio_context = iscsi_detach_aio_context, 1616 .bdrv_attach_aio_context = iscsi_attach_aio_context, 1617 }; 1618 1619 static QemuOptsList qemu_iscsi_opts = { 1620 .name = "iscsi", 1621 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1622 .desc = { 1623 { 1624 .name = "user", 1625 .type = QEMU_OPT_STRING, 1626 .help = "username for CHAP authentication to target", 1627 },{ 1628 .name = "password", 1629 .type = QEMU_OPT_STRING, 1630 .help = "password for CHAP authentication to target", 1631 },{ 1632 .name = "header-digest", 1633 .type = QEMU_OPT_STRING, 1634 .help = "HeaderDigest setting. " 1635 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1636 },{ 1637 .name = "initiator-name", 1638 .type = QEMU_OPT_STRING, 1639 .help = "Initiator iqn name to use when connecting", 1640 }, 1641 { /* end of list */ } 1642 }, 1643 }; 1644 1645 static void iscsi_block_init(void) 1646 { 1647 bdrv_register(&bdrv_iscsi); 1648 qemu_add_opts(&qemu_iscsi_opts); 1649 } 1650 1651 block_init(iscsi_block_init); 1652