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