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 <arpa/inet.h> 30 #include "qemu-common.h" 31 #include "qemu/config-file.h" 32 #include "qemu/error-report.h" 33 #include "qemu/bitops.h" 34 #include "qemu/bitmap.h" 35 #include "block/block_int.h" 36 #include "trace.h" 37 #include "block/scsi.h" 38 #include "qemu/iov.h" 39 #include "sysemu/sysemu.h" 40 #include "qmp-commands.h" 41 42 #include <iscsi/iscsi.h> 43 #include <iscsi/scsi-lowlevel.h> 44 45 #ifdef __linux__ 46 #include <scsi/sg.h> 47 #include <block/scsi.h> 48 #endif 49 50 typedef struct IscsiLun { 51 struct iscsi_context *iscsi; 52 int lun; 53 enum scsi_inquiry_peripheral_device_type type; 54 int block_size; 55 uint64_t num_blocks; 56 int events; 57 QEMUTimer *nop_timer; 58 uint8_t lbpme; 59 uint8_t lbprz; 60 uint8_t has_write_same; 61 struct scsi_inquiry_logical_block_provisioning lbp; 62 struct scsi_inquiry_block_limits bl; 63 unsigned char *zeroblock; 64 unsigned long *allocationmap; 65 int cluster_sectors; 66 } IscsiLun; 67 68 typedef struct IscsiTask { 69 int status; 70 int complete; 71 int retries; 72 int do_retry; 73 struct scsi_task *task; 74 Coroutine *co; 75 QEMUBH *bh; 76 } IscsiTask; 77 78 typedef struct IscsiAIOCB { 79 BlockDriverAIOCB common; 80 QEMUIOVector *qiov; 81 QEMUBH *bh; 82 IscsiLun *iscsilun; 83 struct scsi_task *task; 84 uint8_t *buf; 85 int status; 86 int canceled; 87 int retries; 88 int64_t sector_num; 89 int nb_sectors; 90 #ifdef __linux__ 91 sg_io_hdr_t *ioh; 92 #endif 93 } IscsiAIOCB; 94 95 #define NOP_INTERVAL 5000 96 #define MAX_NOP_FAILURES 3 97 #define ISCSI_CMD_RETRIES 5 98 99 /* this threshhold is a trade-off knob to choose between 100 * the potential additional overhead of an extra GET_LBA_STATUS request 101 * vs. unnecessarily reading a lot of zero sectors over the wire. 102 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES 103 * sectors we check the allocation status of the area covered by the 104 * request first if the allocationmap indicates that the area might be 105 * unallocated. */ 106 #define ISCSI_CHECKALLOC_THRES 64 107 108 static void 109 iscsi_bh_cb(void *p) 110 { 111 IscsiAIOCB *acb = p; 112 113 qemu_bh_delete(acb->bh); 114 115 g_free(acb->buf); 116 acb->buf = NULL; 117 118 if (acb->canceled == 0) { 119 acb->common.cb(acb->common.opaque, acb->status); 120 } 121 122 if (acb->task != NULL) { 123 scsi_free_scsi_task(acb->task); 124 acb->task = NULL; 125 } 126 127 qemu_aio_release(acb); 128 } 129 130 static void 131 iscsi_schedule_bh(IscsiAIOCB *acb) 132 { 133 if (acb->bh) { 134 return; 135 } 136 acb->bh = qemu_bh_new(iscsi_bh_cb, acb); 137 qemu_bh_schedule(acb->bh); 138 } 139 140 static void iscsi_co_generic_bh_cb(void *opaque) 141 { 142 struct IscsiTask *iTask = opaque; 143 qemu_bh_delete(iTask->bh); 144 qemu_coroutine_enter(iTask->co, NULL); 145 } 146 147 static void 148 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 149 void *command_data, void *opaque) 150 { 151 struct IscsiTask *iTask = opaque; 152 struct scsi_task *task = command_data; 153 154 iTask->complete = 1; 155 iTask->status = status; 156 iTask->do_retry = 0; 157 iTask->task = task; 158 159 if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION 160 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 161 error_report("iSCSI CheckCondition: %s", iscsi_get_error(iscsi)); 162 iTask->do_retry = 1; 163 goto out; 164 } 165 166 if (status != SCSI_STATUS_GOOD) { 167 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 168 } 169 170 out: 171 if (iTask->co) { 172 iTask->bh = qemu_bh_new(iscsi_co_generic_bh_cb, iTask); 173 qemu_bh_schedule(iTask->bh); 174 } 175 } 176 177 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 178 { 179 *iTask = (struct IscsiTask) { 180 .co = qemu_coroutine_self(), 181 .retries = ISCSI_CMD_RETRIES, 182 }; 183 } 184 185 static void 186 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 187 void *private_data) 188 { 189 IscsiAIOCB *acb = private_data; 190 191 acb->status = -ECANCELED; 192 iscsi_schedule_bh(acb); 193 } 194 195 static void 196 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 197 { 198 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 199 IscsiLun *iscsilun = acb->iscsilun; 200 201 if (acb->status != -EINPROGRESS) { 202 return; 203 } 204 205 acb->canceled = 1; 206 207 /* send a task mgmt call to the target to cancel the task on the target */ 208 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 209 iscsi_abort_task_cb, acb); 210 211 while (acb->status == -EINPROGRESS) { 212 qemu_aio_wait(); 213 } 214 } 215 216 static const AIOCBInfo iscsi_aiocb_info = { 217 .aiocb_size = sizeof(IscsiAIOCB), 218 .cancel = iscsi_aio_cancel, 219 }; 220 221 222 static void iscsi_process_read(void *arg); 223 static void iscsi_process_write(void *arg); 224 225 static void 226 iscsi_set_events(IscsiLun *iscsilun) 227 { 228 struct iscsi_context *iscsi = iscsilun->iscsi; 229 int ev; 230 231 /* We always register a read handler. */ 232 ev = POLLIN; 233 ev |= iscsi_which_events(iscsi); 234 if (ev != iscsilun->events) { 235 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), 236 iscsi_process_read, 237 (ev & POLLOUT) ? iscsi_process_write : NULL, 238 iscsilun); 239 240 } 241 242 iscsilun->events = ev; 243 } 244 245 static void 246 iscsi_process_read(void *arg) 247 { 248 IscsiLun *iscsilun = arg; 249 struct iscsi_context *iscsi = iscsilun->iscsi; 250 251 iscsi_service(iscsi, POLLIN); 252 iscsi_set_events(iscsilun); 253 } 254 255 static void 256 iscsi_process_write(void *arg) 257 { 258 IscsiLun *iscsilun = arg; 259 struct iscsi_context *iscsi = iscsilun->iscsi; 260 261 iscsi_service(iscsi, POLLOUT); 262 iscsi_set_events(iscsilun); 263 } 264 265 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 266 { 267 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 268 } 269 270 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 271 { 272 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 273 } 274 275 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 276 IscsiLun *iscsilun) 277 { 278 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 279 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 280 error_report("iSCSI misaligned request: " 281 "iscsilun->block_size %u, sector_num %" PRIi64 282 ", nb_sectors %d", 283 iscsilun->block_size, sector_num, nb_sectors); 284 return 0; 285 } 286 return 1; 287 } 288 289 static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num, 290 int nb_sectors) 291 { 292 if (iscsilun->allocationmap == NULL) { 293 return; 294 } 295 bitmap_set(iscsilun->allocationmap, 296 sector_num / iscsilun->cluster_sectors, 297 DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors)); 298 } 299 300 static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num, 301 int nb_sectors) 302 { 303 int64_t cluster_num, nb_clusters; 304 if (iscsilun->allocationmap == NULL) { 305 return; 306 } 307 cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors); 308 nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors 309 - cluster_num; 310 if (nb_clusters > 0) { 311 bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters); 312 } 313 } 314 315 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs, 316 int64_t sector_num, int nb_sectors, 317 QEMUIOVector *iov) 318 { 319 IscsiLun *iscsilun = bs->opaque; 320 struct IscsiTask iTask; 321 uint64_t lba; 322 uint32_t num_sectors; 323 uint8_t *data = NULL; 324 uint8_t *buf = NULL; 325 326 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 327 return -EINVAL; 328 } 329 330 lba = sector_qemu2lun(sector_num, iscsilun); 331 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 332 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 333 /* if the iovec only contains one buffer we can pass it directly */ 334 if (iov->niov == 1) { 335 data = iov->iov[0].iov_base; 336 } else { 337 size_t size = MIN(nb_sectors * BDRV_SECTOR_SIZE, iov->size); 338 buf = g_malloc(size); 339 qemu_iovec_to_buf(iov, 0, buf, size); 340 data = buf; 341 } 342 #endif 343 iscsi_co_init_iscsitask(iscsilun, &iTask); 344 retry: 345 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 346 data, num_sectors * iscsilun->block_size, 347 iscsilun->block_size, 0, 0, 0, 0, 0, 348 iscsi_co_generic_cb, &iTask); 349 if (iTask.task == NULL) { 350 g_free(buf); 351 return -ENOMEM; 352 } 353 #if defined(LIBISCSI_FEATURE_IOVECTOR) 354 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 355 iov->niov); 356 #endif 357 while (!iTask.complete) { 358 iscsi_set_events(iscsilun); 359 qemu_coroutine_yield(); 360 } 361 362 if (iTask.task != NULL) { 363 scsi_free_scsi_task(iTask.task); 364 iTask.task = NULL; 365 } 366 367 if (iTask.do_retry) { 368 iTask.complete = 0; 369 goto retry; 370 } 371 372 g_free(buf); 373 374 if (iTask.status != SCSI_STATUS_GOOD) { 375 return -EIO; 376 } 377 378 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 379 380 return 0; 381 } 382 383 384 static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun, 385 int64_t sector_num, int nb_sectors) 386 { 387 unsigned long size; 388 if (iscsilun->allocationmap == NULL) { 389 return true; 390 } 391 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors); 392 return !(find_next_bit(iscsilun->allocationmap, size, 393 sector_num / iscsilun->cluster_sectors) == size); 394 } 395 396 397 #if defined(LIBISCSI_FEATURE_IOVECTOR) 398 399 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 400 int64_t sector_num, 401 int nb_sectors, int *pnum) 402 { 403 IscsiLun *iscsilun = bs->opaque; 404 struct scsi_get_lba_status *lbas = NULL; 405 struct scsi_lba_status_descriptor *lbasd = NULL; 406 struct IscsiTask iTask; 407 int64_t ret; 408 409 iscsi_co_init_iscsitask(iscsilun, &iTask); 410 411 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 412 ret = -EINVAL; 413 goto out; 414 } 415 416 /* default to all sectors allocated */ 417 ret = BDRV_BLOCK_DATA; 418 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 419 *pnum = nb_sectors; 420 421 /* LUN does not support logical block provisioning */ 422 if (iscsilun->lbpme == 0) { 423 goto out; 424 } 425 426 retry: 427 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 428 sector_qemu2lun(sector_num, iscsilun), 429 8 + 16, iscsi_co_generic_cb, 430 &iTask) == NULL) { 431 ret = -ENOMEM; 432 goto out; 433 } 434 435 while (!iTask.complete) { 436 iscsi_set_events(iscsilun); 437 qemu_coroutine_yield(); 438 } 439 440 if (iTask.do_retry) { 441 if (iTask.task != NULL) { 442 scsi_free_scsi_task(iTask.task); 443 iTask.task = NULL; 444 } 445 iTask.complete = 0; 446 goto retry; 447 } 448 449 if (iTask.status != SCSI_STATUS_GOOD) { 450 /* in case the get_lba_status_callout fails (i.e. 451 * because the device is busy or the cmd is not 452 * supported) we pretend all blocks are allocated 453 * for backwards compatibility */ 454 goto out; 455 } 456 457 lbas = scsi_datain_unmarshall(iTask.task); 458 if (lbas == NULL) { 459 ret = -EIO; 460 goto out; 461 } 462 463 lbasd = &lbas->descriptors[0]; 464 465 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 466 ret = -EIO; 467 goto out; 468 } 469 470 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 471 472 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 473 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 474 ret &= ~BDRV_BLOCK_DATA; 475 if (iscsilun->lbprz) { 476 ret |= BDRV_BLOCK_ZERO; 477 } 478 } 479 480 if (ret & BDRV_BLOCK_ZERO) { 481 iscsi_allocationmap_clear(iscsilun, sector_num, *pnum); 482 } else { 483 iscsi_allocationmap_set(iscsilun, sector_num, *pnum); 484 } 485 486 if (*pnum > nb_sectors) { 487 *pnum = nb_sectors; 488 } 489 out: 490 if (iTask.task != NULL) { 491 scsi_free_scsi_task(iTask.task); 492 } 493 return ret; 494 } 495 496 #endif /* LIBISCSI_FEATURE_IOVECTOR */ 497 498 499 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 500 int64_t sector_num, int nb_sectors, 501 QEMUIOVector *iov) 502 { 503 IscsiLun *iscsilun = bs->opaque; 504 struct IscsiTask iTask; 505 uint64_t lba; 506 uint32_t num_sectors; 507 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 508 int i; 509 #endif 510 511 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 512 return -EINVAL; 513 } 514 515 #if defined(LIBISCSI_FEATURE_IOVECTOR) 516 if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES && 517 !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) { 518 int64_t ret; 519 int pnum; 520 ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum); 521 if (ret < 0) { 522 return ret; 523 } 524 if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) { 525 qemu_iovec_memset(iov, 0, 0x00, iov->size); 526 return 0; 527 } 528 } 529 #endif 530 531 lba = sector_qemu2lun(sector_num, iscsilun); 532 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 533 534 iscsi_co_init_iscsitask(iscsilun, &iTask); 535 retry: 536 switch (iscsilun->type) { 537 case TYPE_DISK: 538 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 539 num_sectors * iscsilun->block_size, 540 iscsilun->block_size, 0, 0, 0, 0, 0, 541 iscsi_co_generic_cb, &iTask); 542 break; 543 default: 544 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 545 num_sectors * iscsilun->block_size, 546 iscsilun->block_size, 547 #if !defined(CONFIG_LIBISCSI_1_4) /* API change from 1.4.0 to 1.5.0 */ 548 0, 0, 0, 0, 0, 549 #endif 550 iscsi_co_generic_cb, &iTask); 551 break; 552 } 553 if (iTask.task == NULL) { 554 return -ENOMEM; 555 } 556 #if defined(LIBISCSI_FEATURE_IOVECTOR) 557 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 558 #else 559 for (i = 0; i < iov->niov; i++) { 560 scsi_task_add_data_in_buffer(iTask.task, 561 iov->iov[i].iov_len, 562 iov->iov[i].iov_base); 563 } 564 #endif 565 566 while (!iTask.complete) { 567 iscsi_set_events(iscsilun); 568 qemu_coroutine_yield(); 569 } 570 571 if (iTask.task != NULL) { 572 scsi_free_scsi_task(iTask.task); 573 iTask.task = NULL; 574 } 575 576 if (iTask.do_retry) { 577 iTask.complete = 0; 578 goto retry; 579 } 580 581 if (iTask.status != SCSI_STATUS_GOOD) { 582 return -EIO; 583 } 584 585 return 0; 586 } 587 588 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 589 { 590 IscsiLun *iscsilun = bs->opaque; 591 struct IscsiTask iTask; 592 593 if (bs->sg) { 594 return 0; 595 } 596 597 iscsi_co_init_iscsitask(iscsilun, &iTask); 598 599 retry: 600 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 601 0, iscsi_co_generic_cb, &iTask) == NULL) { 602 return -ENOMEM; 603 } 604 605 while (!iTask.complete) { 606 iscsi_set_events(iscsilun); 607 qemu_coroutine_yield(); 608 } 609 610 if (iTask.task != NULL) { 611 scsi_free_scsi_task(iTask.task); 612 iTask.task = NULL; 613 } 614 615 if (iTask.do_retry) { 616 iTask.complete = 0; 617 goto retry; 618 } 619 620 if (iTask.status != SCSI_STATUS_GOOD) { 621 return -EIO; 622 } 623 624 return 0; 625 } 626 627 #ifdef __linux__ 628 static void 629 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 630 void *command_data, void *opaque) 631 { 632 IscsiAIOCB *acb = opaque; 633 634 g_free(acb->buf); 635 acb->buf = NULL; 636 637 if (acb->canceled != 0) { 638 return; 639 } 640 641 acb->status = 0; 642 if (status < 0) { 643 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 644 iscsi_get_error(iscsi)); 645 acb->status = -EIO; 646 } 647 648 acb->ioh->driver_status = 0; 649 acb->ioh->host_status = 0; 650 acb->ioh->resid = 0; 651 652 #define SG_ERR_DRIVER_SENSE 0x08 653 654 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 655 int ss; 656 657 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 658 659 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 660 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 661 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 662 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 663 } 664 665 iscsi_schedule_bh(acb); 666 } 667 668 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 669 unsigned long int req, void *buf, 670 BlockDriverCompletionFunc *cb, void *opaque) 671 { 672 IscsiLun *iscsilun = bs->opaque; 673 struct iscsi_context *iscsi = iscsilun->iscsi; 674 struct iscsi_data data; 675 IscsiAIOCB *acb; 676 677 assert(req == SG_IO); 678 679 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 680 681 acb->iscsilun = iscsilun; 682 acb->canceled = 0; 683 acb->bh = NULL; 684 acb->status = -EINPROGRESS; 685 acb->buf = NULL; 686 acb->ioh = buf; 687 688 acb->task = malloc(sizeof(struct scsi_task)); 689 if (acb->task == NULL) { 690 error_report("iSCSI: Failed to allocate task for scsi command. %s", 691 iscsi_get_error(iscsi)); 692 qemu_aio_release(acb); 693 return NULL; 694 } 695 memset(acb->task, 0, sizeof(struct scsi_task)); 696 697 switch (acb->ioh->dxfer_direction) { 698 case SG_DXFER_TO_DEV: 699 acb->task->xfer_dir = SCSI_XFER_WRITE; 700 break; 701 case SG_DXFER_FROM_DEV: 702 acb->task->xfer_dir = SCSI_XFER_READ; 703 break; 704 default: 705 acb->task->xfer_dir = SCSI_XFER_NONE; 706 break; 707 } 708 709 acb->task->cdb_size = acb->ioh->cmd_len; 710 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 711 acb->task->expxferlen = acb->ioh->dxfer_len; 712 713 data.size = 0; 714 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 715 if (acb->ioh->iovec_count == 0) { 716 data.data = acb->ioh->dxferp; 717 data.size = acb->ioh->dxfer_len; 718 } else { 719 #if defined(LIBISCSI_FEATURE_IOVECTOR) 720 scsi_task_set_iov_out(acb->task, 721 (struct scsi_iovec *) acb->ioh->dxferp, 722 acb->ioh->iovec_count); 723 #else 724 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 725 726 acb->buf = g_malloc(acb->ioh->dxfer_len); 727 data.data = acb->buf; 728 data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0, 729 acb->buf, acb->ioh->dxfer_len); 730 #endif 731 } 732 } 733 734 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 735 iscsi_aio_ioctl_cb, 736 (data.size > 0) ? &data : NULL, 737 acb) != 0) { 738 scsi_free_scsi_task(acb->task); 739 qemu_aio_release(acb); 740 return NULL; 741 } 742 743 /* tell libiscsi to read straight into the buffer we got from ioctl */ 744 if (acb->task->xfer_dir == SCSI_XFER_READ) { 745 if (acb->ioh->iovec_count == 0) { 746 scsi_task_add_data_in_buffer(acb->task, 747 acb->ioh->dxfer_len, 748 acb->ioh->dxferp); 749 } else { 750 #if defined(LIBISCSI_FEATURE_IOVECTOR) 751 scsi_task_set_iov_in(acb->task, 752 (struct scsi_iovec *) acb->ioh->dxferp, 753 acb->ioh->iovec_count); 754 #else 755 int i; 756 for (i = 0; i < acb->ioh->iovec_count; i++) { 757 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 758 759 scsi_task_add_data_in_buffer(acb->task, 760 iov[i].iov_len, 761 iov[i].iov_base); 762 } 763 #endif 764 } 765 } 766 767 iscsi_set_events(iscsilun); 768 769 return &acb->common; 770 } 771 772 773 static void ioctl_cb(void *opaque, int status) 774 { 775 int *p_status = opaque; 776 *p_status = status; 777 } 778 779 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 780 { 781 IscsiLun *iscsilun = bs->opaque; 782 int status; 783 784 switch (req) { 785 case SG_GET_VERSION_NUM: 786 *(int *)buf = 30000; 787 break; 788 case SG_GET_SCSI_ID: 789 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 790 break; 791 case SG_IO: 792 status = -EINPROGRESS; 793 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 794 795 while (status == -EINPROGRESS) { 796 qemu_aio_wait(); 797 } 798 799 return 0; 800 default: 801 return -1; 802 } 803 return 0; 804 } 805 #endif 806 807 static int64_t 808 iscsi_getlength(BlockDriverState *bs) 809 { 810 IscsiLun *iscsilun = bs->opaque; 811 int64_t len; 812 813 len = iscsilun->num_blocks; 814 len *= iscsilun->block_size; 815 816 return len; 817 } 818 819 static int 820 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 821 int nb_sectors) 822 { 823 IscsiLun *iscsilun = bs->opaque; 824 struct IscsiTask iTask; 825 struct unmap_list list; 826 827 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 828 return -EINVAL; 829 } 830 831 if (!iscsilun->lbp.lbpu) { 832 /* UNMAP is not supported by the target */ 833 return 0; 834 } 835 836 list.lba = sector_qemu2lun(sector_num, iscsilun); 837 list.num = sector_qemu2lun(nb_sectors, iscsilun); 838 839 iscsi_co_init_iscsitask(iscsilun, &iTask); 840 retry: 841 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 842 iscsi_co_generic_cb, &iTask) == NULL) { 843 return -ENOMEM; 844 } 845 846 while (!iTask.complete) { 847 iscsi_set_events(iscsilun); 848 qemu_coroutine_yield(); 849 } 850 851 if (iTask.task != NULL) { 852 scsi_free_scsi_task(iTask.task); 853 iTask.task = NULL; 854 } 855 856 if (iTask.do_retry) { 857 iTask.complete = 0; 858 goto retry; 859 } 860 861 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 862 /* the target might fail with a check condition if it 863 is not happy with the alignment of the UNMAP request 864 we silently fail in this case */ 865 return 0; 866 } 867 868 if (iTask.status != SCSI_STATUS_GOOD) { 869 return -EIO; 870 } 871 872 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 873 874 return 0; 875 } 876 877 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 878 879 static int 880 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 881 int nb_sectors, BdrvRequestFlags flags) 882 { 883 IscsiLun *iscsilun = bs->opaque; 884 struct IscsiTask iTask; 885 uint64_t lba; 886 uint32_t nb_blocks; 887 888 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 889 return -EINVAL; 890 } 891 892 if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) { 893 /* WRITE SAME with UNMAP is not supported by the target, 894 * fall back and try WRITE SAME without UNMAP */ 895 flags &= ~BDRV_REQ_MAY_UNMAP; 896 } 897 898 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 899 /* WRITE SAME without UNMAP is not supported by the target */ 900 return -ENOTSUP; 901 } 902 903 lba = sector_qemu2lun(sector_num, iscsilun); 904 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 905 906 if (iscsilun->zeroblock == NULL) { 907 iscsilun->zeroblock = g_malloc0(iscsilun->block_size); 908 } 909 910 iscsi_co_init_iscsitask(iscsilun, &iTask); 911 retry: 912 if (iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 913 iscsilun->zeroblock, iscsilun->block_size, 914 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 915 0, 0, iscsi_co_generic_cb, &iTask) == NULL) { 916 return -ENOMEM; 917 } 918 919 while (!iTask.complete) { 920 iscsi_set_events(iscsilun); 921 qemu_coroutine_yield(); 922 } 923 924 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 925 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 926 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 927 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 928 /* WRITE SAME is not supported by the target */ 929 iscsilun->has_write_same = false; 930 scsi_free_scsi_task(iTask.task); 931 return -ENOTSUP; 932 } 933 934 if (iTask.task != NULL) { 935 scsi_free_scsi_task(iTask.task); 936 iTask.task = NULL; 937 } 938 939 if (iTask.do_retry) { 940 iTask.complete = 0; 941 goto retry; 942 } 943 944 if (iTask.status != SCSI_STATUS_GOOD) { 945 return -EIO; 946 } 947 948 if (flags & BDRV_REQ_MAY_UNMAP) { 949 iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors); 950 } else { 951 iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors); 952 } 953 954 return 0; 955 } 956 957 #endif /* SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED */ 958 959 static void parse_chap(struct iscsi_context *iscsi, const char *target, 960 Error **errp) 961 { 962 QemuOptsList *list; 963 QemuOpts *opts; 964 const char *user = NULL; 965 const char *password = NULL; 966 967 list = qemu_find_opts("iscsi"); 968 if (!list) { 969 return; 970 } 971 972 opts = qemu_opts_find(list, target); 973 if (opts == NULL) { 974 opts = QTAILQ_FIRST(&list->head); 975 if (!opts) { 976 return; 977 } 978 } 979 980 user = qemu_opt_get(opts, "user"); 981 if (!user) { 982 return; 983 } 984 985 password = qemu_opt_get(opts, "password"); 986 if (!password) { 987 error_setg(errp, "CHAP username specified but no password was given"); 988 return; 989 } 990 991 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 992 error_setg(errp, "Failed to set initiator username and password"); 993 } 994 } 995 996 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 997 Error **errp) 998 { 999 QemuOptsList *list; 1000 QemuOpts *opts; 1001 const char *digest = NULL; 1002 1003 list = qemu_find_opts("iscsi"); 1004 if (!list) { 1005 return; 1006 } 1007 1008 opts = qemu_opts_find(list, target); 1009 if (opts == NULL) { 1010 opts = QTAILQ_FIRST(&list->head); 1011 if (!opts) { 1012 return; 1013 } 1014 } 1015 1016 digest = qemu_opt_get(opts, "header-digest"); 1017 if (!digest) { 1018 return; 1019 } 1020 1021 if (!strcmp(digest, "CRC32C")) { 1022 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1023 } else if (!strcmp(digest, "NONE")) { 1024 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1025 } else if (!strcmp(digest, "CRC32C-NONE")) { 1026 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1027 } else if (!strcmp(digest, "NONE-CRC32C")) { 1028 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1029 } else { 1030 error_setg(errp, "Invalid header-digest setting : %s", digest); 1031 } 1032 } 1033 1034 static char *parse_initiator_name(const char *target) 1035 { 1036 QemuOptsList *list; 1037 QemuOpts *opts; 1038 const char *name; 1039 char *iscsi_name; 1040 UuidInfo *uuid_info; 1041 1042 list = qemu_find_opts("iscsi"); 1043 if (list) { 1044 opts = qemu_opts_find(list, target); 1045 if (!opts) { 1046 opts = QTAILQ_FIRST(&list->head); 1047 } 1048 if (opts) { 1049 name = qemu_opt_get(opts, "initiator-name"); 1050 if (name) { 1051 return g_strdup(name); 1052 } 1053 } 1054 } 1055 1056 uuid_info = qmp_query_uuid(NULL); 1057 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1058 name = qemu_get_vm_name(); 1059 } else { 1060 name = uuid_info->UUID; 1061 } 1062 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1063 name ? ":" : "", name ? name : ""); 1064 qapi_free_UuidInfo(uuid_info); 1065 return iscsi_name; 1066 } 1067 1068 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1069 static void iscsi_nop_timed_event(void *opaque) 1070 { 1071 IscsiLun *iscsilun = opaque; 1072 1073 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 1074 error_report("iSCSI: NOP timeout. Reconnecting..."); 1075 iscsi_reconnect(iscsilun->iscsi); 1076 } 1077 1078 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1079 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1080 return; 1081 } 1082 1083 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1084 iscsi_set_events(iscsilun); 1085 } 1086 #endif 1087 1088 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1089 { 1090 struct scsi_task *task = NULL; 1091 struct scsi_readcapacity10 *rc10 = NULL; 1092 struct scsi_readcapacity16 *rc16 = NULL; 1093 int retries = ISCSI_CMD_RETRIES; 1094 1095 do { 1096 if (task != NULL) { 1097 scsi_free_scsi_task(task); 1098 task = NULL; 1099 } 1100 1101 switch (iscsilun->type) { 1102 case TYPE_DISK: 1103 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1104 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1105 rc16 = scsi_datain_unmarshall(task); 1106 if (rc16 == NULL) { 1107 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1108 } else { 1109 iscsilun->block_size = rc16->block_length; 1110 iscsilun->num_blocks = rc16->returned_lba + 1; 1111 iscsilun->lbpme = rc16->lbpme; 1112 iscsilun->lbprz = rc16->lbprz; 1113 } 1114 } 1115 break; 1116 case TYPE_ROM: 1117 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1118 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1119 rc10 = scsi_datain_unmarshall(task); 1120 if (rc10 == NULL) { 1121 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1122 } else { 1123 iscsilun->block_size = rc10->block_size; 1124 if (rc10->lba == 0) { 1125 /* blank disk loaded */ 1126 iscsilun->num_blocks = 0; 1127 } else { 1128 iscsilun->num_blocks = rc10->lba + 1; 1129 } 1130 } 1131 } 1132 break; 1133 default: 1134 return; 1135 } 1136 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1137 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1138 && retries-- > 0); 1139 1140 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1141 error_setg(errp, "iSCSI: failed to send readcapacity10 command."); 1142 } 1143 if (task) { 1144 scsi_free_scsi_task(task); 1145 } 1146 } 1147 1148 /* TODO Convert to fine grained options */ 1149 static QemuOptsList runtime_opts = { 1150 .name = "iscsi", 1151 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1152 .desc = { 1153 { 1154 .name = "filename", 1155 .type = QEMU_OPT_STRING, 1156 .help = "URL to the iscsi image", 1157 }, 1158 { /* end of list */ } 1159 }, 1160 }; 1161 1162 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1163 int evpd, int pc, void **inq, Error **errp) 1164 { 1165 int full_size; 1166 struct scsi_task *task = NULL; 1167 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1168 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1169 goto fail; 1170 } 1171 full_size = scsi_datain_getfullsize(task); 1172 if (full_size > task->datain.size) { 1173 scsi_free_scsi_task(task); 1174 1175 /* we need more data for the full list */ 1176 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1177 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1178 goto fail; 1179 } 1180 } 1181 1182 *inq = scsi_datain_unmarshall(task); 1183 if (*inq == NULL) { 1184 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1185 goto fail_with_err; 1186 } 1187 1188 return task; 1189 1190 fail: 1191 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1192 iscsi_get_error(iscsi)); 1193 fail_with_err: 1194 if (task != NULL) { 1195 scsi_free_scsi_task(task); 1196 } 1197 return NULL; 1198 } 1199 1200 /* 1201 * We support iscsi url's on the form 1202 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1203 * 1204 * Note: flags are currently not used by iscsi_open. If this function 1205 * is changed such that flags are used, please examine iscsi_reopen_prepare() 1206 * to see if needs to be changed as well. 1207 */ 1208 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1209 Error **errp) 1210 { 1211 IscsiLun *iscsilun = bs->opaque; 1212 struct iscsi_context *iscsi = NULL; 1213 struct iscsi_url *iscsi_url = NULL; 1214 struct scsi_task *task = NULL; 1215 struct scsi_inquiry_standard *inq = NULL; 1216 struct scsi_inquiry_supported_pages *inq_vpd; 1217 char *initiator_name = NULL; 1218 QemuOpts *opts; 1219 Error *local_err = NULL; 1220 const char *filename; 1221 int i, ret; 1222 1223 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1224 error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. " 1225 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1226 "of 512", BDRV_SECTOR_SIZE); 1227 return -EINVAL; 1228 } 1229 1230 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1231 qemu_opts_absorb_qdict(opts, options, &local_err); 1232 if (local_err) { 1233 error_propagate(errp, local_err); 1234 ret = -EINVAL; 1235 goto out; 1236 } 1237 1238 filename = qemu_opt_get(opts, "filename"); 1239 1240 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1241 if (iscsi_url == NULL) { 1242 error_setg(errp, "Failed to parse URL : %s", filename); 1243 ret = -EINVAL; 1244 goto out; 1245 } 1246 1247 memset(iscsilun, 0, sizeof(IscsiLun)); 1248 1249 initiator_name = parse_initiator_name(iscsi_url->target); 1250 1251 iscsi = iscsi_create_context(initiator_name); 1252 if (iscsi == NULL) { 1253 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1254 ret = -ENOMEM; 1255 goto out; 1256 } 1257 1258 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1259 error_setg(errp, "iSCSI: Failed to set target name."); 1260 ret = -EINVAL; 1261 goto out; 1262 } 1263 1264 if (iscsi_url->user != NULL) { 1265 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1266 iscsi_url->passwd); 1267 if (ret != 0) { 1268 error_setg(errp, "Failed to set initiator username and password"); 1269 ret = -EINVAL; 1270 goto out; 1271 } 1272 } 1273 1274 /* check if we got CHAP username/password via the options */ 1275 parse_chap(iscsi, iscsi_url->target, &local_err); 1276 if (local_err != NULL) { 1277 error_propagate(errp, local_err); 1278 ret = -EINVAL; 1279 goto out; 1280 } 1281 1282 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1283 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1284 ret = -EINVAL; 1285 goto out; 1286 } 1287 1288 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1289 1290 /* check if we got HEADER_DIGEST via the options */ 1291 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1292 if (local_err != NULL) { 1293 error_propagate(errp, local_err); 1294 ret = -EINVAL; 1295 goto out; 1296 } 1297 1298 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1299 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1300 iscsi_get_error(iscsi)); 1301 ret = -EINVAL; 1302 goto out; 1303 } 1304 1305 iscsilun->iscsi = iscsi; 1306 iscsilun->lun = iscsi_url->lun; 1307 iscsilun->has_write_same = true; 1308 1309 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1310 (void **) &inq, errp); 1311 if (task == NULL) { 1312 ret = -EINVAL; 1313 goto out; 1314 } 1315 iscsilun->type = inq->periperal_device_type; 1316 scsi_free_scsi_task(task); 1317 task = NULL; 1318 1319 iscsi_readcapacity_sync(iscsilun, &local_err); 1320 if (local_err != NULL) { 1321 error_propagate(errp, local_err); 1322 ret = -EINVAL; 1323 goto out; 1324 } 1325 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1326 bs->request_alignment = iscsilun->block_size; 1327 1328 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1329 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1330 * will try to read from the device to guess the image format. 1331 */ 1332 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1333 bs->sg = 1; 1334 } 1335 1336 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1337 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1338 (void **) &inq_vpd, errp); 1339 if (task == NULL) { 1340 ret = -EINVAL; 1341 goto out; 1342 } 1343 for (i = 0; i < inq_vpd->num_pages; i++) { 1344 struct scsi_task *inq_task; 1345 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1346 struct scsi_inquiry_block_limits *inq_bl; 1347 switch (inq_vpd->pages[i]) { 1348 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1349 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1350 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1351 (void **) &inq_lbp, errp); 1352 if (inq_task == NULL) { 1353 ret = -EINVAL; 1354 goto out; 1355 } 1356 memcpy(&iscsilun->lbp, inq_lbp, 1357 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1358 scsi_free_scsi_task(inq_task); 1359 break; 1360 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1361 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1362 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1363 (void **) &inq_bl, errp); 1364 if (inq_task == NULL) { 1365 ret = -EINVAL; 1366 goto out; 1367 } 1368 memcpy(&iscsilun->bl, inq_bl, 1369 sizeof(struct scsi_inquiry_block_limits)); 1370 scsi_free_scsi_task(inq_task); 1371 break; 1372 default: 1373 break; 1374 } 1375 } 1376 scsi_free_scsi_task(task); 1377 task = NULL; 1378 1379 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1380 /* Set up a timer for sending out iSCSI NOPs */ 1381 iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun); 1382 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1383 #endif 1384 1385 /* Guess the internal cluster (page) size of the iscsi target by the means 1386 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1387 * reasonable size */ 1388 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 && 1389 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1390 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran * 1391 iscsilun->block_size) >> BDRV_SECTOR_BITS; 1392 #if defined(LIBISCSI_FEATURE_IOVECTOR) 1393 if (iscsilun->lbprz && !(bs->open_flags & BDRV_O_NOCACHE)) { 1394 iscsilun->allocationmap = 1395 bitmap_new(DIV_ROUND_UP(bs->total_sectors, 1396 iscsilun->cluster_sectors)); 1397 } 1398 #endif 1399 } 1400 1401 out: 1402 qemu_opts_del(opts); 1403 if (initiator_name != NULL) { 1404 g_free(initiator_name); 1405 } 1406 if (iscsi_url != NULL) { 1407 iscsi_destroy_url(iscsi_url); 1408 } 1409 if (task != NULL) { 1410 scsi_free_scsi_task(task); 1411 } 1412 1413 if (ret) { 1414 if (iscsi != NULL) { 1415 iscsi_destroy_context(iscsi); 1416 } 1417 memset(iscsilun, 0, sizeof(IscsiLun)); 1418 } 1419 return ret; 1420 } 1421 1422 static void iscsi_close(BlockDriverState *bs) 1423 { 1424 IscsiLun *iscsilun = bs->opaque; 1425 struct iscsi_context *iscsi = iscsilun->iscsi; 1426 1427 if (iscsilun->nop_timer) { 1428 timer_del(iscsilun->nop_timer); 1429 timer_free(iscsilun->nop_timer); 1430 } 1431 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL); 1432 iscsi_destroy_context(iscsi); 1433 g_free(iscsilun->zeroblock); 1434 g_free(iscsilun->allocationmap); 1435 memset(iscsilun, 0, sizeof(IscsiLun)); 1436 } 1437 1438 static int iscsi_refresh_limits(BlockDriverState *bs) 1439 { 1440 IscsiLun *iscsilun = bs->opaque; 1441 1442 /* We don't actually refresh here, but just return data queried in 1443 * iscsi_open(): iscsi targets don't change their limits. */ 1444 if (iscsilun->lbp.lbpu) { 1445 if (iscsilun->bl.max_unmap < 0xffffffff) { 1446 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1447 iscsilun); 1448 } 1449 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1450 iscsilun); 1451 } 1452 1453 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1454 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1455 iscsilun); 1456 } 1457 if (iscsilun->lbp.lbpws) { 1458 bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1459 iscsilun); 1460 } 1461 bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len, 1462 iscsilun); 1463 return 0; 1464 } 1465 1466 /* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in 1467 * prepare. Note that this will not re-establish a connection with an iSCSI 1468 * target - it is effectively a NOP. */ 1469 static int iscsi_reopen_prepare(BDRVReopenState *state, 1470 BlockReopenQueue *queue, Error **errp) 1471 { 1472 /* NOP */ 1473 return 0; 1474 } 1475 1476 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1477 { 1478 IscsiLun *iscsilun = bs->opaque; 1479 Error *local_err = NULL; 1480 1481 if (iscsilun->type != TYPE_DISK) { 1482 return -ENOTSUP; 1483 } 1484 1485 iscsi_readcapacity_sync(iscsilun, &local_err); 1486 if (local_err != NULL) { 1487 error_free(local_err); 1488 return -EIO; 1489 } 1490 1491 if (offset > iscsi_getlength(bs)) { 1492 return -EINVAL; 1493 } 1494 1495 if (iscsilun->allocationmap != NULL) { 1496 g_free(iscsilun->allocationmap); 1497 iscsilun->allocationmap = 1498 bitmap_new(DIV_ROUND_UP(bs->total_sectors, 1499 iscsilun->cluster_sectors)); 1500 } 1501 1502 return 0; 1503 } 1504 1505 static int iscsi_create(const char *filename, QEMUOptionParameter *options, 1506 Error **errp) 1507 { 1508 int ret = 0; 1509 int64_t total_size = 0; 1510 BlockDriverState *bs; 1511 IscsiLun *iscsilun = NULL; 1512 QDict *bs_options; 1513 1514 bs = bdrv_new("", &error_abort); 1515 1516 /* Read out options */ 1517 while (options && options->name) { 1518 if (!strcmp(options->name, "size")) { 1519 total_size = options->value.n / BDRV_SECTOR_SIZE; 1520 } 1521 options++; 1522 } 1523 1524 bs->opaque = g_malloc0(sizeof(struct IscsiLun)); 1525 iscsilun = bs->opaque; 1526 1527 bs_options = qdict_new(); 1528 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1529 ret = iscsi_open(bs, bs_options, 0, NULL); 1530 QDECREF(bs_options); 1531 1532 if (ret != 0) { 1533 goto out; 1534 } 1535 if (iscsilun->nop_timer) { 1536 timer_del(iscsilun->nop_timer); 1537 timer_free(iscsilun->nop_timer); 1538 } 1539 if (iscsilun->type != TYPE_DISK) { 1540 ret = -ENODEV; 1541 goto out; 1542 } 1543 if (bs->total_sectors < total_size) { 1544 ret = -ENOSPC; 1545 goto out; 1546 } 1547 1548 ret = 0; 1549 out: 1550 if (iscsilun->iscsi != NULL) { 1551 iscsi_destroy_context(iscsilun->iscsi); 1552 } 1553 g_free(bs->opaque); 1554 bs->opaque = NULL; 1555 bdrv_unref(bs); 1556 return ret; 1557 } 1558 1559 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1560 { 1561 IscsiLun *iscsilun = bs->opaque; 1562 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1563 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1564 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE; 1565 return 0; 1566 } 1567 1568 static QEMUOptionParameter iscsi_create_options[] = { 1569 { 1570 .name = BLOCK_OPT_SIZE, 1571 .type = OPT_SIZE, 1572 .help = "Virtual disk size" 1573 }, 1574 { NULL } 1575 }; 1576 1577 static BlockDriver bdrv_iscsi = { 1578 .format_name = "iscsi", 1579 .protocol_name = "iscsi", 1580 1581 .instance_size = sizeof(IscsiLun), 1582 .bdrv_needs_filename = true, 1583 .bdrv_file_open = iscsi_open, 1584 .bdrv_close = iscsi_close, 1585 .bdrv_create = iscsi_create, 1586 .create_options = iscsi_create_options, 1587 .bdrv_reopen_prepare = iscsi_reopen_prepare, 1588 1589 .bdrv_getlength = iscsi_getlength, 1590 .bdrv_get_info = iscsi_get_info, 1591 .bdrv_truncate = iscsi_truncate, 1592 .bdrv_refresh_limits = iscsi_refresh_limits, 1593 1594 #if defined(LIBISCSI_FEATURE_IOVECTOR) 1595 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1596 #endif 1597 .bdrv_co_discard = iscsi_co_discard, 1598 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 1599 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1600 #endif 1601 .bdrv_co_readv = iscsi_co_readv, 1602 .bdrv_co_writev = iscsi_co_writev, 1603 .bdrv_co_flush_to_disk = iscsi_co_flush, 1604 1605 #ifdef __linux__ 1606 .bdrv_ioctl = iscsi_ioctl, 1607 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1608 #endif 1609 }; 1610 1611 static QemuOptsList qemu_iscsi_opts = { 1612 .name = "iscsi", 1613 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1614 .desc = { 1615 { 1616 .name = "user", 1617 .type = QEMU_OPT_STRING, 1618 .help = "username for CHAP authentication to target", 1619 },{ 1620 .name = "password", 1621 .type = QEMU_OPT_STRING, 1622 .help = "password for CHAP authentication to target", 1623 },{ 1624 .name = "header-digest", 1625 .type = QEMU_OPT_STRING, 1626 .help = "HeaderDigest setting. " 1627 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1628 },{ 1629 .name = "initiator-name", 1630 .type = QEMU_OPT_STRING, 1631 .help = "Initiator iqn name to use when connecting", 1632 }, 1633 { /* end of list */ } 1634 }, 1635 }; 1636 1637 static void iscsi_block_init(void) 1638 { 1639 bdrv_register(&bdrv_iscsi); 1640 qemu_add_opts(&qemu_iscsi_opts); 1641 } 1642 1643 block_init(iscsi_block_init); 1644