1 /* 2 * QEMU Block driver for iSCSI images 3 * 4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com> 5 * Copyright (c) 2012-2013 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 "block/block_int.h" 34 #include "trace.h" 35 #include "block/scsi.h" 36 #include "qemu/iov.h" 37 #include "sysemu/sysemu.h" 38 #include "qmp-commands.h" 39 40 #include <iscsi/iscsi.h> 41 #include <iscsi/scsi-lowlevel.h> 42 43 #ifdef __linux__ 44 #include <scsi/sg.h> 45 #include <block/scsi.h> 46 #endif 47 48 typedef struct IscsiLun { 49 struct iscsi_context *iscsi; 50 int lun; 51 enum scsi_inquiry_peripheral_device_type type; 52 int block_size; 53 uint64_t num_blocks; 54 int events; 55 QEMUTimer *nop_timer; 56 uint8_t lbpme; 57 uint8_t lbprz; 58 uint8_t has_write_same; 59 struct scsi_inquiry_logical_block_provisioning lbp; 60 struct scsi_inquiry_block_limits bl; 61 unsigned char *zeroblock; 62 } IscsiLun; 63 64 typedef struct IscsiTask { 65 int status; 66 int complete; 67 int retries; 68 int do_retry; 69 struct scsi_task *task; 70 Coroutine *co; 71 QEMUBH *bh; 72 } IscsiTask; 73 74 typedef struct IscsiAIOCB { 75 BlockDriverAIOCB common; 76 QEMUIOVector *qiov; 77 QEMUBH *bh; 78 IscsiLun *iscsilun; 79 struct scsi_task *task; 80 uint8_t *buf; 81 int status; 82 int canceled; 83 int retries; 84 int64_t sector_num; 85 int nb_sectors; 86 #ifdef __linux__ 87 sg_io_hdr_t *ioh; 88 #endif 89 } IscsiAIOCB; 90 91 #define NOP_INTERVAL 5000 92 #define MAX_NOP_FAILURES 3 93 #define ISCSI_CMD_RETRIES 5 94 95 static void 96 iscsi_bh_cb(void *p) 97 { 98 IscsiAIOCB *acb = p; 99 100 qemu_bh_delete(acb->bh); 101 102 g_free(acb->buf); 103 acb->buf = NULL; 104 105 if (acb->canceled == 0) { 106 acb->common.cb(acb->common.opaque, acb->status); 107 } 108 109 if (acb->task != NULL) { 110 scsi_free_scsi_task(acb->task); 111 acb->task = NULL; 112 } 113 114 qemu_aio_release(acb); 115 } 116 117 static void 118 iscsi_schedule_bh(IscsiAIOCB *acb) 119 { 120 if (acb->bh) { 121 return; 122 } 123 acb->bh = qemu_bh_new(iscsi_bh_cb, acb); 124 qemu_bh_schedule(acb->bh); 125 } 126 127 static void iscsi_co_generic_bh_cb(void *opaque) 128 { 129 struct IscsiTask *iTask = opaque; 130 qemu_bh_delete(iTask->bh); 131 qemu_coroutine_enter(iTask->co, NULL); 132 } 133 134 static void 135 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 136 void *command_data, void *opaque) 137 { 138 struct IscsiTask *iTask = opaque; 139 struct scsi_task *task = command_data; 140 141 iTask->complete = 1; 142 iTask->status = status; 143 iTask->do_retry = 0; 144 iTask->task = task; 145 146 if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION 147 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 148 error_report("iSCSI CheckCondition: %s", iscsi_get_error(iscsi)); 149 iTask->do_retry = 1; 150 goto out; 151 } 152 153 if (status != SCSI_STATUS_GOOD) { 154 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi)); 155 } 156 157 out: 158 if (iTask->co) { 159 iTask->bh = qemu_bh_new(iscsi_co_generic_bh_cb, iTask); 160 qemu_bh_schedule(iTask->bh); 161 } 162 } 163 164 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 165 { 166 *iTask = (struct IscsiTask) { 167 .co = qemu_coroutine_self(), 168 .retries = ISCSI_CMD_RETRIES, 169 }; 170 } 171 172 static void 173 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 174 void *private_data) 175 { 176 IscsiAIOCB *acb = private_data; 177 178 acb->status = -ECANCELED; 179 iscsi_schedule_bh(acb); 180 } 181 182 static void 183 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 184 { 185 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 186 IscsiLun *iscsilun = acb->iscsilun; 187 188 if (acb->status != -EINPROGRESS) { 189 return; 190 } 191 192 acb->canceled = 1; 193 194 /* send a task mgmt call to the target to cancel the task on the target */ 195 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 196 iscsi_abort_task_cb, acb); 197 198 while (acb->status == -EINPROGRESS) { 199 qemu_aio_wait(); 200 } 201 } 202 203 static const AIOCBInfo iscsi_aiocb_info = { 204 .aiocb_size = sizeof(IscsiAIOCB), 205 .cancel = iscsi_aio_cancel, 206 }; 207 208 209 static void iscsi_process_read(void *arg); 210 static void iscsi_process_write(void *arg); 211 212 static void 213 iscsi_set_events(IscsiLun *iscsilun) 214 { 215 struct iscsi_context *iscsi = iscsilun->iscsi; 216 int ev; 217 218 /* We always register a read handler. */ 219 ev = POLLIN; 220 ev |= iscsi_which_events(iscsi); 221 if (ev != iscsilun->events) { 222 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), 223 iscsi_process_read, 224 (ev & POLLOUT) ? iscsi_process_write : NULL, 225 iscsilun); 226 227 } 228 229 iscsilun->events = ev; 230 } 231 232 static void 233 iscsi_process_read(void *arg) 234 { 235 IscsiLun *iscsilun = arg; 236 struct iscsi_context *iscsi = iscsilun->iscsi; 237 238 iscsi_service(iscsi, POLLIN); 239 iscsi_set_events(iscsilun); 240 } 241 242 static void 243 iscsi_process_write(void *arg) 244 { 245 IscsiLun *iscsilun = arg; 246 struct iscsi_context *iscsi = iscsilun->iscsi; 247 248 iscsi_service(iscsi, POLLOUT); 249 iscsi_set_events(iscsilun); 250 } 251 252 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 253 { 254 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 255 } 256 257 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 258 { 259 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 260 } 261 262 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 263 IscsiLun *iscsilun) 264 { 265 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 266 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 267 error_report("iSCSI misaligned request: " 268 "iscsilun->block_size %u, sector_num %" PRIi64 269 ", nb_sectors %d", 270 iscsilun->block_size, sector_num, nb_sectors); 271 return 0; 272 } 273 return 1; 274 } 275 276 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs, 277 int64_t sector_num, int nb_sectors, 278 QEMUIOVector *iov) 279 { 280 IscsiLun *iscsilun = bs->opaque; 281 struct IscsiTask iTask; 282 uint64_t lba; 283 uint32_t num_sectors; 284 uint8_t *data = NULL; 285 uint8_t *buf = NULL; 286 287 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 288 return -EINVAL; 289 } 290 291 lba = sector_qemu2lun(sector_num, iscsilun); 292 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 293 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 294 /* if the iovec only contains one buffer we can pass it directly */ 295 if (iov->niov == 1) { 296 data = iov->iov[0].iov_base; 297 } else { 298 size_t size = MIN(nb_sectors * BDRV_SECTOR_SIZE, iov->size); 299 buf = g_malloc(size); 300 qemu_iovec_to_buf(iov, 0, buf, size); 301 data = buf; 302 } 303 #endif 304 iscsi_co_init_iscsitask(iscsilun, &iTask); 305 retry: 306 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba, 307 data, num_sectors * iscsilun->block_size, 308 iscsilun->block_size, 0, 0, 0, 0, 0, 309 iscsi_co_generic_cb, &iTask); 310 if (iTask.task == NULL) { 311 g_free(buf); 312 return -ENOMEM; 313 } 314 #if defined(LIBISCSI_FEATURE_IOVECTOR) 315 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov, 316 iov->niov); 317 #endif 318 while (!iTask.complete) { 319 iscsi_set_events(iscsilun); 320 qemu_coroutine_yield(); 321 } 322 323 if (iTask.task != NULL) { 324 scsi_free_scsi_task(iTask.task); 325 iTask.task = NULL; 326 } 327 328 if (iTask.do_retry) { 329 iTask.complete = 0; 330 goto retry; 331 } 332 333 g_free(buf); 334 335 if (iTask.status != SCSI_STATUS_GOOD) { 336 return -EIO; 337 } 338 339 return 0; 340 } 341 342 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, 343 int64_t sector_num, int nb_sectors, 344 QEMUIOVector *iov) 345 { 346 IscsiLun *iscsilun = bs->opaque; 347 struct IscsiTask iTask; 348 uint64_t lba; 349 uint32_t num_sectors; 350 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 351 int i; 352 #endif 353 354 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 355 return -EINVAL; 356 } 357 358 lba = sector_qemu2lun(sector_num, iscsilun); 359 num_sectors = sector_qemu2lun(nb_sectors, iscsilun); 360 361 iscsi_co_init_iscsitask(iscsilun, &iTask); 362 retry: 363 switch (iscsilun->type) { 364 case TYPE_DISK: 365 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, 366 num_sectors * iscsilun->block_size, 367 iscsilun->block_size, 0, 0, 0, 0, 0, 368 iscsi_co_generic_cb, &iTask); 369 break; 370 default: 371 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, 372 num_sectors * iscsilun->block_size, 373 iscsilun->block_size, 374 #if !defined(CONFIG_LIBISCSI_1_4) /* API change from 1.4.0 to 1.5.0 */ 375 0, 0, 0, 0, 0, 376 #endif 377 iscsi_co_generic_cb, &iTask); 378 break; 379 } 380 if (iTask.task == NULL) { 381 return -ENOMEM; 382 } 383 #if defined(LIBISCSI_FEATURE_IOVECTOR) 384 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); 385 #else 386 for (i = 0; i < iov->niov; i++) { 387 scsi_task_add_data_in_buffer(iTask.task, 388 iov->iov[i].iov_len, 389 iov->iov[i].iov_base); 390 } 391 #endif 392 393 while (!iTask.complete) { 394 iscsi_set_events(iscsilun); 395 qemu_coroutine_yield(); 396 } 397 398 if (iTask.task != NULL) { 399 scsi_free_scsi_task(iTask.task); 400 iTask.task = NULL; 401 } 402 403 if (iTask.do_retry) { 404 iTask.complete = 0; 405 goto retry; 406 } 407 408 if (iTask.status != SCSI_STATUS_GOOD) { 409 return -EIO; 410 } 411 412 return 0; 413 } 414 415 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs) 416 { 417 IscsiLun *iscsilun = bs->opaque; 418 struct IscsiTask iTask; 419 420 if (bs->sg) { 421 return 0; 422 } 423 424 iscsi_co_init_iscsitask(iscsilun, &iTask); 425 426 retry: 427 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0, 428 0, iscsi_co_generic_cb, &iTask) == NULL) { 429 return -ENOMEM; 430 } 431 432 while (!iTask.complete) { 433 iscsi_set_events(iscsilun); 434 qemu_coroutine_yield(); 435 } 436 437 if (iTask.task != NULL) { 438 scsi_free_scsi_task(iTask.task); 439 iTask.task = NULL; 440 } 441 442 if (iTask.do_retry) { 443 iTask.complete = 0; 444 goto retry; 445 } 446 447 if (iTask.status != SCSI_STATUS_GOOD) { 448 return -EIO; 449 } 450 451 return 0; 452 } 453 454 #ifdef __linux__ 455 static void 456 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 457 void *command_data, void *opaque) 458 { 459 IscsiAIOCB *acb = opaque; 460 461 g_free(acb->buf); 462 acb->buf = NULL; 463 464 if (acb->canceled != 0) { 465 return; 466 } 467 468 acb->status = 0; 469 if (status < 0) { 470 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 471 iscsi_get_error(iscsi)); 472 acb->status = -EIO; 473 } 474 475 acb->ioh->driver_status = 0; 476 acb->ioh->host_status = 0; 477 acb->ioh->resid = 0; 478 479 #define SG_ERR_DRIVER_SENSE 0x08 480 481 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 482 int ss; 483 484 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 485 486 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 487 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 488 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 489 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 490 } 491 492 iscsi_schedule_bh(acb); 493 } 494 495 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 496 unsigned long int req, void *buf, 497 BlockDriverCompletionFunc *cb, void *opaque) 498 { 499 IscsiLun *iscsilun = bs->opaque; 500 struct iscsi_context *iscsi = iscsilun->iscsi; 501 struct iscsi_data data; 502 IscsiAIOCB *acb; 503 504 assert(req == SG_IO); 505 506 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 507 508 acb->iscsilun = iscsilun; 509 acb->canceled = 0; 510 acb->bh = NULL; 511 acb->status = -EINPROGRESS; 512 acb->buf = NULL; 513 acb->ioh = buf; 514 515 acb->task = malloc(sizeof(struct scsi_task)); 516 if (acb->task == NULL) { 517 error_report("iSCSI: Failed to allocate task for scsi command. %s", 518 iscsi_get_error(iscsi)); 519 qemu_aio_release(acb); 520 return NULL; 521 } 522 memset(acb->task, 0, sizeof(struct scsi_task)); 523 524 switch (acb->ioh->dxfer_direction) { 525 case SG_DXFER_TO_DEV: 526 acb->task->xfer_dir = SCSI_XFER_WRITE; 527 break; 528 case SG_DXFER_FROM_DEV: 529 acb->task->xfer_dir = SCSI_XFER_READ; 530 break; 531 default: 532 acb->task->xfer_dir = SCSI_XFER_NONE; 533 break; 534 } 535 536 acb->task->cdb_size = acb->ioh->cmd_len; 537 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 538 acb->task->expxferlen = acb->ioh->dxfer_len; 539 540 data.size = 0; 541 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 542 if (acb->ioh->iovec_count == 0) { 543 data.data = acb->ioh->dxferp; 544 data.size = acb->ioh->dxfer_len; 545 } else { 546 #if defined(LIBISCSI_FEATURE_IOVECTOR) 547 scsi_task_set_iov_out(acb->task, 548 (struct scsi_iovec *) acb->ioh->dxferp, 549 acb->ioh->iovec_count); 550 #else 551 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 552 553 acb->buf = g_malloc(acb->ioh->dxfer_len); 554 data.data = acb->buf; 555 data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0, 556 acb->buf, acb->ioh->dxfer_len); 557 #endif 558 } 559 } 560 561 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 562 iscsi_aio_ioctl_cb, 563 (data.size > 0) ? &data : NULL, 564 acb) != 0) { 565 scsi_free_scsi_task(acb->task); 566 qemu_aio_release(acb); 567 return NULL; 568 } 569 570 /* tell libiscsi to read straight into the buffer we got from ioctl */ 571 if (acb->task->xfer_dir == SCSI_XFER_READ) { 572 if (acb->ioh->iovec_count == 0) { 573 scsi_task_add_data_in_buffer(acb->task, 574 acb->ioh->dxfer_len, 575 acb->ioh->dxferp); 576 } else { 577 #if defined(LIBISCSI_FEATURE_IOVECTOR) 578 scsi_task_set_iov_in(acb->task, 579 (struct scsi_iovec *) acb->ioh->dxferp, 580 acb->ioh->iovec_count); 581 #else 582 int i; 583 for (i = 0; i < acb->ioh->iovec_count; i++) { 584 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 585 586 scsi_task_add_data_in_buffer(acb->task, 587 iov[i].iov_len, 588 iov[i].iov_base); 589 } 590 #endif 591 } 592 } 593 594 iscsi_set_events(iscsilun); 595 596 return &acb->common; 597 } 598 599 600 static void ioctl_cb(void *opaque, int status) 601 { 602 int *p_status = opaque; 603 *p_status = status; 604 } 605 606 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 607 { 608 IscsiLun *iscsilun = bs->opaque; 609 int status; 610 611 switch (req) { 612 case SG_GET_VERSION_NUM: 613 *(int *)buf = 30000; 614 break; 615 case SG_GET_SCSI_ID: 616 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 617 break; 618 case SG_IO: 619 status = -EINPROGRESS; 620 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 621 622 while (status == -EINPROGRESS) { 623 qemu_aio_wait(); 624 } 625 626 return 0; 627 default: 628 return -1; 629 } 630 return 0; 631 } 632 #endif 633 634 static int64_t 635 iscsi_getlength(BlockDriverState *bs) 636 { 637 IscsiLun *iscsilun = bs->opaque; 638 int64_t len; 639 640 len = iscsilun->num_blocks; 641 len *= iscsilun->block_size; 642 643 return len; 644 } 645 646 #if defined(LIBISCSI_FEATURE_IOVECTOR) 647 648 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 649 int64_t sector_num, 650 int nb_sectors, int *pnum) 651 { 652 IscsiLun *iscsilun = bs->opaque; 653 struct scsi_get_lba_status *lbas = NULL; 654 struct scsi_lba_status_descriptor *lbasd = NULL; 655 struct IscsiTask iTask; 656 int64_t ret; 657 658 iscsi_co_init_iscsitask(iscsilun, &iTask); 659 660 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 661 ret = -EINVAL; 662 goto out; 663 } 664 665 /* default to all sectors allocated */ 666 ret = BDRV_BLOCK_DATA; 667 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 668 *pnum = nb_sectors; 669 670 /* LUN does not support logical block provisioning */ 671 if (iscsilun->lbpme == 0) { 672 goto out; 673 } 674 675 retry: 676 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 677 sector_qemu2lun(sector_num, iscsilun), 678 8 + 16, iscsi_co_generic_cb, 679 &iTask) == NULL) { 680 ret = -ENOMEM; 681 goto out; 682 } 683 684 while (!iTask.complete) { 685 iscsi_set_events(iscsilun); 686 qemu_coroutine_yield(); 687 } 688 689 if (iTask.do_retry) { 690 if (iTask.task != NULL) { 691 scsi_free_scsi_task(iTask.task); 692 iTask.task = NULL; 693 } 694 iTask.complete = 0; 695 goto retry; 696 } 697 698 if (iTask.status != SCSI_STATUS_GOOD) { 699 /* in case the get_lba_status_callout fails (i.e. 700 * because the device is busy or the cmd is not 701 * supported) we pretend all blocks are allocated 702 * for backwards compatibility */ 703 goto out; 704 } 705 706 lbas = scsi_datain_unmarshall(iTask.task); 707 if (lbas == NULL) { 708 ret = -EIO; 709 goto out; 710 } 711 712 lbasd = &lbas->descriptors[0]; 713 714 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 715 ret = -EIO; 716 goto out; 717 } 718 719 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 720 if (*pnum > nb_sectors) { 721 *pnum = nb_sectors; 722 } 723 724 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 725 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 726 ret &= ~BDRV_BLOCK_DATA; 727 if (iscsilun->lbprz) { 728 ret |= BDRV_BLOCK_ZERO; 729 } 730 } 731 732 out: 733 if (iTask.task != NULL) { 734 scsi_free_scsi_task(iTask.task); 735 } 736 return ret; 737 } 738 739 #endif /* LIBISCSI_FEATURE_IOVECTOR */ 740 741 static int 742 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 743 int nb_sectors) 744 { 745 IscsiLun *iscsilun = bs->opaque; 746 struct IscsiTask iTask; 747 struct unmap_list list; 748 749 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 750 return -EINVAL; 751 } 752 753 if (!iscsilun->lbp.lbpu) { 754 /* UNMAP is not supported by the target */ 755 return 0; 756 } 757 758 list.lba = sector_qemu2lun(sector_num, iscsilun); 759 list.num = sector_qemu2lun(nb_sectors, iscsilun); 760 761 iscsi_co_init_iscsitask(iscsilun, &iTask); 762 retry: 763 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 764 iscsi_co_generic_cb, &iTask) == NULL) { 765 return -ENOMEM; 766 } 767 768 while (!iTask.complete) { 769 iscsi_set_events(iscsilun); 770 qemu_coroutine_yield(); 771 } 772 773 if (iTask.task != NULL) { 774 scsi_free_scsi_task(iTask.task); 775 iTask.task = NULL; 776 } 777 778 if (iTask.do_retry) { 779 iTask.complete = 0; 780 goto retry; 781 } 782 783 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 784 /* the target might fail with a check condition if it 785 is not happy with the alignment of the UNMAP request 786 we silently fail in this case */ 787 return 0; 788 } 789 790 if (iTask.status != SCSI_STATUS_GOOD) { 791 return -EIO; 792 } 793 794 return 0; 795 } 796 797 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 798 799 static int 800 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 801 int nb_sectors, BdrvRequestFlags flags) 802 { 803 IscsiLun *iscsilun = bs->opaque; 804 struct IscsiTask iTask; 805 uint64_t lba; 806 uint32_t nb_blocks; 807 808 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 809 return -EINVAL; 810 } 811 812 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 813 /* WRITE SAME without UNMAP is not supported by the target */ 814 return -ENOTSUP; 815 } 816 817 if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) { 818 /* WRITE SAME with UNMAP is not supported by the target */ 819 return -ENOTSUP; 820 } 821 822 lba = sector_qemu2lun(sector_num, iscsilun); 823 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 824 825 if (iscsilun->zeroblock == NULL) { 826 iscsilun->zeroblock = g_malloc0(iscsilun->block_size); 827 } 828 829 iscsi_co_init_iscsitask(iscsilun, &iTask); 830 retry: 831 if (iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 832 iscsilun->zeroblock, iscsilun->block_size, 833 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 834 0, 0, iscsi_co_generic_cb, &iTask) == NULL) { 835 return -ENOMEM; 836 } 837 838 while (!iTask.complete) { 839 iscsi_set_events(iscsilun); 840 qemu_coroutine_yield(); 841 } 842 843 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 844 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 845 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE || 846 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) { 847 /* WRITE SAME is not supported by the target */ 848 iscsilun->has_write_same = false; 849 scsi_free_scsi_task(iTask.task); 850 return -ENOTSUP; 851 } 852 853 if (iTask.task != NULL) { 854 scsi_free_scsi_task(iTask.task); 855 iTask.task = NULL; 856 } 857 858 if (iTask.do_retry) { 859 iTask.complete = 0; 860 goto retry; 861 } 862 863 if (iTask.status != SCSI_STATUS_GOOD) { 864 return -EIO; 865 } 866 867 return 0; 868 } 869 870 #endif /* SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED */ 871 872 static void parse_chap(struct iscsi_context *iscsi, const char *target, 873 Error **errp) 874 { 875 QemuOptsList *list; 876 QemuOpts *opts; 877 const char *user = NULL; 878 const char *password = NULL; 879 880 list = qemu_find_opts("iscsi"); 881 if (!list) { 882 return; 883 } 884 885 opts = qemu_opts_find(list, target); 886 if (opts == NULL) { 887 opts = QTAILQ_FIRST(&list->head); 888 if (!opts) { 889 return; 890 } 891 } 892 893 user = qemu_opt_get(opts, "user"); 894 if (!user) { 895 return; 896 } 897 898 password = qemu_opt_get(opts, "password"); 899 if (!password) { 900 error_setg(errp, "CHAP username specified but no password was given"); 901 return; 902 } 903 904 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 905 error_setg(errp, "Failed to set initiator username and password"); 906 } 907 } 908 909 static void parse_header_digest(struct iscsi_context *iscsi, const char *target, 910 Error **errp) 911 { 912 QemuOptsList *list; 913 QemuOpts *opts; 914 const char *digest = NULL; 915 916 list = qemu_find_opts("iscsi"); 917 if (!list) { 918 return; 919 } 920 921 opts = qemu_opts_find(list, target); 922 if (opts == NULL) { 923 opts = QTAILQ_FIRST(&list->head); 924 if (!opts) { 925 return; 926 } 927 } 928 929 digest = qemu_opt_get(opts, "header-digest"); 930 if (!digest) { 931 return; 932 } 933 934 if (!strcmp(digest, "CRC32C")) { 935 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 936 } else if (!strcmp(digest, "NONE")) { 937 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 938 } else if (!strcmp(digest, "CRC32C-NONE")) { 939 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 940 } else if (!strcmp(digest, "NONE-CRC32C")) { 941 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 942 } else { 943 error_setg(errp, "Invalid header-digest setting : %s", digest); 944 } 945 } 946 947 static char *parse_initiator_name(const char *target) 948 { 949 QemuOptsList *list; 950 QemuOpts *opts; 951 const char *name; 952 char *iscsi_name; 953 UuidInfo *uuid_info; 954 955 list = qemu_find_opts("iscsi"); 956 if (list) { 957 opts = qemu_opts_find(list, target); 958 if (!opts) { 959 opts = QTAILQ_FIRST(&list->head); 960 } 961 if (opts) { 962 name = qemu_opt_get(opts, "initiator-name"); 963 if (name) { 964 return g_strdup(name); 965 } 966 } 967 } 968 969 uuid_info = qmp_query_uuid(NULL); 970 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 971 name = qemu_get_vm_name(); 972 } else { 973 name = uuid_info->UUID; 974 } 975 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 976 name ? ":" : "", name ? name : ""); 977 qapi_free_UuidInfo(uuid_info); 978 return iscsi_name; 979 } 980 981 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 982 static void iscsi_nop_timed_event(void *opaque) 983 { 984 IscsiLun *iscsilun = opaque; 985 986 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 987 error_report("iSCSI: NOP timeout. Reconnecting..."); 988 iscsi_reconnect(iscsilun->iscsi); 989 } 990 991 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 992 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 993 return; 994 } 995 996 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 997 iscsi_set_events(iscsilun); 998 } 999 #endif 1000 1001 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp) 1002 { 1003 struct scsi_task *task = NULL; 1004 struct scsi_readcapacity10 *rc10 = NULL; 1005 struct scsi_readcapacity16 *rc16 = NULL; 1006 int retries = ISCSI_CMD_RETRIES; 1007 1008 do { 1009 if (task != NULL) { 1010 scsi_free_scsi_task(task); 1011 task = NULL; 1012 } 1013 1014 switch (iscsilun->type) { 1015 case TYPE_DISK: 1016 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1017 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1018 rc16 = scsi_datain_unmarshall(task); 1019 if (rc16 == NULL) { 1020 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data."); 1021 } else { 1022 iscsilun->block_size = rc16->block_length; 1023 iscsilun->num_blocks = rc16->returned_lba + 1; 1024 iscsilun->lbpme = rc16->lbpme; 1025 iscsilun->lbprz = rc16->lbprz; 1026 } 1027 } 1028 break; 1029 case TYPE_ROM: 1030 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1031 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1032 rc10 = scsi_datain_unmarshall(task); 1033 if (rc10 == NULL) { 1034 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data."); 1035 } else { 1036 iscsilun->block_size = rc10->block_size; 1037 if (rc10->lba == 0) { 1038 /* blank disk loaded */ 1039 iscsilun->num_blocks = 0; 1040 } else { 1041 iscsilun->num_blocks = rc10->lba + 1; 1042 } 1043 } 1044 } 1045 break; 1046 default: 1047 return; 1048 } 1049 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1050 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1051 && retries-- > 0); 1052 1053 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1054 error_setg(errp, "iSCSI: failed to send readcapacity10 command."); 1055 } 1056 if (task) { 1057 scsi_free_scsi_task(task); 1058 } 1059 } 1060 1061 /* TODO Convert to fine grained options */ 1062 static QemuOptsList runtime_opts = { 1063 .name = "iscsi", 1064 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1065 .desc = { 1066 { 1067 .name = "filename", 1068 .type = QEMU_OPT_STRING, 1069 .help = "URL to the iscsi image", 1070 }, 1071 { /* end of list */ } 1072 }, 1073 }; 1074 1075 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun, 1076 int evpd, int pc, void **inq, Error **errp) 1077 { 1078 int full_size; 1079 struct scsi_task *task = NULL; 1080 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1081 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1082 goto fail; 1083 } 1084 full_size = scsi_datain_getfullsize(task); 1085 if (full_size > task->datain.size) { 1086 scsi_free_scsi_task(task); 1087 1088 /* we need more data for the full list */ 1089 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1090 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1091 goto fail; 1092 } 1093 } 1094 1095 *inq = scsi_datain_unmarshall(task); 1096 if (*inq == NULL) { 1097 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob"); 1098 goto fail_with_err; 1099 } 1100 1101 return task; 1102 1103 fail: 1104 error_setg(errp, "iSCSI: Inquiry command failed : %s", 1105 iscsi_get_error(iscsi)); 1106 fail_with_err: 1107 if (task != NULL) { 1108 scsi_free_scsi_task(task); 1109 } 1110 return NULL; 1111 } 1112 1113 /* 1114 * We support iscsi url's on the form 1115 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1116 * 1117 * Note: flags are currently not used by iscsi_open. If this function 1118 * is changed such that flags are used, please examine iscsi_reopen_prepare() 1119 * to see if needs to be changed as well. 1120 */ 1121 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1122 Error **errp) 1123 { 1124 IscsiLun *iscsilun = bs->opaque; 1125 struct iscsi_context *iscsi = NULL; 1126 struct iscsi_url *iscsi_url = NULL; 1127 struct scsi_task *task = NULL; 1128 struct scsi_inquiry_standard *inq = NULL; 1129 struct scsi_inquiry_supported_pages *inq_vpd; 1130 char *initiator_name = NULL; 1131 QemuOpts *opts; 1132 Error *local_err = NULL; 1133 const char *filename; 1134 int i, ret; 1135 1136 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1137 error_setg(errp, "iSCSI: Invalid BDRV_SECTOR_SIZE. " 1138 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1139 "of 512", BDRV_SECTOR_SIZE); 1140 return -EINVAL; 1141 } 1142 1143 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 1144 qemu_opts_absorb_qdict(opts, options, &local_err); 1145 if (local_err) { 1146 error_propagate(errp, local_err); 1147 ret = -EINVAL; 1148 goto out; 1149 } 1150 1151 filename = qemu_opt_get(opts, "filename"); 1152 1153 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1154 if (iscsi_url == NULL) { 1155 error_setg(errp, "Failed to parse URL : %s", filename); 1156 ret = -EINVAL; 1157 goto out; 1158 } 1159 1160 memset(iscsilun, 0, sizeof(IscsiLun)); 1161 1162 initiator_name = parse_initiator_name(iscsi_url->target); 1163 1164 iscsi = iscsi_create_context(initiator_name); 1165 if (iscsi == NULL) { 1166 error_setg(errp, "iSCSI: Failed to create iSCSI context."); 1167 ret = -ENOMEM; 1168 goto out; 1169 } 1170 1171 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1172 error_setg(errp, "iSCSI: Failed to set target name."); 1173 ret = -EINVAL; 1174 goto out; 1175 } 1176 1177 if (iscsi_url->user != NULL) { 1178 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1179 iscsi_url->passwd); 1180 if (ret != 0) { 1181 error_setg(errp, "Failed to set initiator username and password"); 1182 ret = -EINVAL; 1183 goto out; 1184 } 1185 } 1186 1187 /* check if we got CHAP username/password via the options */ 1188 parse_chap(iscsi, iscsi_url->target, &local_err); 1189 if (local_err != NULL) { 1190 error_propagate(errp, local_err); 1191 ret = -EINVAL; 1192 goto out; 1193 } 1194 1195 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1196 error_setg(errp, "iSCSI: Failed to set session type to normal."); 1197 ret = -EINVAL; 1198 goto out; 1199 } 1200 1201 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1202 1203 /* check if we got HEADER_DIGEST via the options */ 1204 parse_header_digest(iscsi, iscsi_url->target, &local_err); 1205 if (local_err != NULL) { 1206 error_propagate(errp, local_err); 1207 ret = -EINVAL; 1208 goto out; 1209 } 1210 1211 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1212 error_setg(errp, "iSCSI: Failed to connect to LUN : %s", 1213 iscsi_get_error(iscsi)); 1214 ret = -EINVAL; 1215 goto out; 1216 } 1217 1218 iscsilun->iscsi = iscsi; 1219 iscsilun->lun = iscsi_url->lun; 1220 iscsilun->has_write_same = true; 1221 1222 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0, 1223 (void **) &inq, errp); 1224 if (task == NULL) { 1225 ret = -EINVAL; 1226 goto out; 1227 } 1228 iscsilun->type = inq->periperal_device_type; 1229 scsi_free_scsi_task(task); 1230 task = NULL; 1231 1232 iscsi_readcapacity_sync(iscsilun, &local_err); 1233 if (local_err != NULL) { 1234 error_propagate(errp, local_err); 1235 ret = -EINVAL; 1236 goto out; 1237 } 1238 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1239 bs->request_alignment = iscsilun->block_size; 1240 1241 /* We don't have any emulation for devices other than disks and CD-ROMs, so 1242 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu 1243 * will try to read from the device to guess the image format. 1244 */ 1245 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) { 1246 bs->sg = 1; 1247 } 1248 1249 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1250 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES, 1251 (void **) &inq_vpd, errp); 1252 if (task == NULL) { 1253 ret = -EINVAL; 1254 goto out; 1255 } 1256 for (i = 0; i < inq_vpd->num_pages; i++) { 1257 struct scsi_task *inq_task; 1258 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1259 struct scsi_inquiry_block_limits *inq_bl; 1260 switch (inq_vpd->pages[i]) { 1261 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING: 1262 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1263 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING, 1264 (void **) &inq_lbp, errp); 1265 if (inq_task == NULL) { 1266 ret = -EINVAL; 1267 goto out; 1268 } 1269 memcpy(&iscsilun->lbp, inq_lbp, 1270 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1271 scsi_free_scsi_task(inq_task); 1272 break; 1273 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS: 1274 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1275 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS, 1276 (void **) &inq_bl, errp); 1277 if (inq_task == NULL) { 1278 ret = -EINVAL; 1279 goto out; 1280 } 1281 memcpy(&iscsilun->bl, inq_bl, 1282 sizeof(struct scsi_inquiry_block_limits)); 1283 scsi_free_scsi_task(inq_task); 1284 break; 1285 default: 1286 break; 1287 } 1288 } 1289 scsi_free_scsi_task(task); 1290 task = NULL; 1291 1292 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1293 /* Set up a timer for sending out iSCSI NOPs */ 1294 iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun); 1295 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1296 #endif 1297 1298 out: 1299 qemu_opts_del(opts); 1300 if (initiator_name != NULL) { 1301 g_free(initiator_name); 1302 } 1303 if (iscsi_url != NULL) { 1304 iscsi_destroy_url(iscsi_url); 1305 } 1306 if (task != NULL) { 1307 scsi_free_scsi_task(task); 1308 } 1309 1310 if (ret) { 1311 if (iscsi != NULL) { 1312 iscsi_destroy_context(iscsi); 1313 } 1314 memset(iscsilun, 0, sizeof(IscsiLun)); 1315 } 1316 return ret; 1317 } 1318 1319 static void iscsi_close(BlockDriverState *bs) 1320 { 1321 IscsiLun *iscsilun = bs->opaque; 1322 struct iscsi_context *iscsi = iscsilun->iscsi; 1323 1324 if (iscsilun->nop_timer) { 1325 timer_del(iscsilun->nop_timer); 1326 timer_free(iscsilun->nop_timer); 1327 } 1328 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL); 1329 iscsi_destroy_context(iscsi); 1330 g_free(iscsilun->zeroblock); 1331 memset(iscsilun, 0, sizeof(IscsiLun)); 1332 } 1333 1334 static int iscsi_refresh_limits(BlockDriverState *bs) 1335 { 1336 IscsiLun *iscsilun = bs->opaque; 1337 1338 /* We don't actually refresh here, but just return data queried in 1339 * iscsi_open(): iscsi targets don't change their limits. */ 1340 if (iscsilun->lbp.lbpu) { 1341 if (iscsilun->bl.max_unmap < 0xffffffff) { 1342 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1343 iscsilun); 1344 } 1345 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1346 iscsilun); 1347 } 1348 1349 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1350 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1351 iscsilun); 1352 } 1353 if (iscsilun->lbp.lbpws) { 1354 bs->bl.write_zeroes_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1355 iscsilun); 1356 } 1357 bs->bl.opt_transfer_length = sector_lun2qemu(iscsilun->bl.opt_xfer_len, 1358 iscsilun); 1359 return 0; 1360 } 1361 1362 /* Since iscsi_open() ignores bdrv_flags, there is nothing to do here in 1363 * prepare. Note that this will not re-establish a connection with an iSCSI 1364 * target - it is effectively a NOP. */ 1365 static int iscsi_reopen_prepare(BDRVReopenState *state, 1366 BlockReopenQueue *queue, Error **errp) 1367 { 1368 /* NOP */ 1369 return 0; 1370 } 1371 1372 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1373 { 1374 IscsiLun *iscsilun = bs->opaque; 1375 Error *local_err = NULL; 1376 1377 if (iscsilun->type != TYPE_DISK) { 1378 return -ENOTSUP; 1379 } 1380 1381 iscsi_readcapacity_sync(iscsilun, &local_err); 1382 if (local_err != NULL) { 1383 error_free(local_err); 1384 return -EIO; 1385 } 1386 1387 if (offset > iscsi_getlength(bs)) { 1388 return -EINVAL; 1389 } 1390 1391 return 0; 1392 } 1393 1394 static int iscsi_create(const char *filename, QEMUOptionParameter *options, 1395 Error **errp) 1396 { 1397 int ret = 0; 1398 int64_t total_size = 0; 1399 BlockDriverState *bs; 1400 IscsiLun *iscsilun = NULL; 1401 QDict *bs_options; 1402 1403 bs = bdrv_new("", &error_abort); 1404 1405 /* Read out options */ 1406 while (options && options->name) { 1407 if (!strcmp(options->name, "size")) { 1408 total_size = options->value.n / BDRV_SECTOR_SIZE; 1409 } 1410 options++; 1411 } 1412 1413 bs->opaque = g_malloc0(sizeof(struct IscsiLun)); 1414 iscsilun = bs->opaque; 1415 1416 bs_options = qdict_new(); 1417 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1418 ret = iscsi_open(bs, bs_options, 0, NULL); 1419 QDECREF(bs_options); 1420 1421 if (ret != 0) { 1422 goto out; 1423 } 1424 if (iscsilun->nop_timer) { 1425 timer_del(iscsilun->nop_timer); 1426 timer_free(iscsilun->nop_timer); 1427 } 1428 if (iscsilun->type != TYPE_DISK) { 1429 ret = -ENODEV; 1430 goto out; 1431 } 1432 if (bs->total_sectors < total_size) { 1433 ret = -ENOSPC; 1434 goto out; 1435 } 1436 1437 ret = 0; 1438 out: 1439 if (iscsilun->iscsi != NULL) { 1440 iscsi_destroy_context(iscsilun->iscsi); 1441 } 1442 g_free(bs->opaque); 1443 bs->opaque = NULL; 1444 bdrv_unref(bs); 1445 return ret; 1446 } 1447 1448 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1449 { 1450 IscsiLun *iscsilun = bs->opaque; 1451 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1452 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1453 /* Guess the internal cluster (page) size of the iscsi target by the means 1454 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1455 * reasonable size for bdi->cluster_size */ 1456 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 && 1457 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1458 bdi->cluster_size = iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1459 } 1460 return 0; 1461 } 1462 1463 static QEMUOptionParameter iscsi_create_options[] = { 1464 { 1465 .name = BLOCK_OPT_SIZE, 1466 .type = OPT_SIZE, 1467 .help = "Virtual disk size" 1468 }, 1469 { NULL } 1470 }; 1471 1472 static BlockDriver bdrv_iscsi = { 1473 .format_name = "iscsi", 1474 .protocol_name = "iscsi", 1475 1476 .instance_size = sizeof(IscsiLun), 1477 .bdrv_needs_filename = true, 1478 .bdrv_file_open = iscsi_open, 1479 .bdrv_close = iscsi_close, 1480 .bdrv_create = iscsi_create, 1481 .create_options = iscsi_create_options, 1482 .bdrv_reopen_prepare = iscsi_reopen_prepare, 1483 1484 .bdrv_getlength = iscsi_getlength, 1485 .bdrv_get_info = iscsi_get_info, 1486 .bdrv_truncate = iscsi_truncate, 1487 .bdrv_refresh_limits = iscsi_refresh_limits, 1488 1489 #if defined(LIBISCSI_FEATURE_IOVECTOR) 1490 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1491 #endif 1492 .bdrv_co_discard = iscsi_co_discard, 1493 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 1494 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1495 #endif 1496 .bdrv_co_readv = iscsi_co_readv, 1497 .bdrv_co_writev = iscsi_co_writev, 1498 .bdrv_co_flush_to_disk = iscsi_co_flush, 1499 1500 #ifdef __linux__ 1501 .bdrv_ioctl = iscsi_ioctl, 1502 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1503 #endif 1504 }; 1505 1506 static QemuOptsList qemu_iscsi_opts = { 1507 .name = "iscsi", 1508 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1509 .desc = { 1510 { 1511 .name = "user", 1512 .type = QEMU_OPT_STRING, 1513 .help = "username for CHAP authentication to target", 1514 },{ 1515 .name = "password", 1516 .type = QEMU_OPT_STRING, 1517 .help = "password for CHAP authentication to target", 1518 },{ 1519 .name = "header-digest", 1520 .type = QEMU_OPT_STRING, 1521 .help = "HeaderDigest setting. " 1522 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1523 },{ 1524 .name = "initiator-name", 1525 .type = QEMU_OPT_STRING, 1526 .help = "Initiator iqn name to use when connecting", 1527 }, 1528 { /* end of list */ } 1529 }, 1530 }; 1531 1532 static void iscsi_block_init(void) 1533 { 1534 bdrv_register(&bdrv_iscsi); 1535 qemu_add_opts(&qemu_iscsi_opts); 1536 } 1537 1538 block_init(iscsi_block_init); 1539