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 } IscsiTask; 72 73 typedef struct IscsiAIOCB { 74 BlockDriverAIOCB common; 75 QEMUIOVector *qiov; 76 QEMUBH *bh; 77 IscsiLun *iscsilun; 78 struct scsi_task *task; 79 uint8_t *buf; 80 int status; 81 int canceled; 82 int retries; 83 int64_t sector_num; 84 int nb_sectors; 85 #ifdef __linux__ 86 sg_io_hdr_t *ioh; 87 #endif 88 } IscsiAIOCB; 89 90 #define NOP_INTERVAL 5000 91 #define MAX_NOP_FAILURES 3 92 #define ISCSI_CMD_RETRIES 5 93 94 static void 95 iscsi_bh_cb(void *p) 96 { 97 IscsiAIOCB *acb = p; 98 99 qemu_bh_delete(acb->bh); 100 101 g_free(acb->buf); 102 acb->buf = NULL; 103 104 if (acb->canceled == 0) { 105 acb->common.cb(acb->common.opaque, acb->status); 106 } 107 108 if (acb->task != NULL) { 109 scsi_free_scsi_task(acb->task); 110 acb->task = NULL; 111 } 112 113 qemu_aio_release(acb); 114 } 115 116 static void 117 iscsi_schedule_bh(IscsiAIOCB *acb) 118 { 119 if (acb->bh) { 120 return; 121 } 122 acb->bh = qemu_bh_new(iscsi_bh_cb, acb); 123 qemu_bh_schedule(acb->bh); 124 } 125 126 static void 127 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status, 128 void *command_data, void *opaque) 129 { 130 struct IscsiTask *iTask = opaque; 131 struct scsi_task *task = command_data; 132 133 iTask->complete = 1; 134 iTask->status = status; 135 iTask->do_retry = 0; 136 iTask->task = task; 137 138 if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION 139 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) { 140 iTask->do_retry = 1; 141 goto out; 142 } 143 144 if (status != SCSI_STATUS_GOOD) { 145 error_report("iSCSI: Failure. %s", iscsi_get_error(iscsi)); 146 } 147 148 out: 149 if (iTask->co) { 150 qemu_coroutine_enter(iTask->co, NULL); 151 } 152 } 153 154 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask) 155 { 156 *iTask = (struct IscsiTask) { 157 .co = qemu_coroutine_self(), 158 .retries = ISCSI_CMD_RETRIES, 159 }; 160 } 161 162 static void 163 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data, 164 void *private_data) 165 { 166 IscsiAIOCB *acb = private_data; 167 168 acb->status = -ECANCELED; 169 iscsi_schedule_bh(acb); 170 } 171 172 static void 173 iscsi_aio_cancel(BlockDriverAIOCB *blockacb) 174 { 175 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb; 176 IscsiLun *iscsilun = acb->iscsilun; 177 178 if (acb->status != -EINPROGRESS) { 179 return; 180 } 181 182 acb->canceled = 1; 183 184 /* send a task mgmt call to the target to cancel the task on the target */ 185 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task, 186 iscsi_abort_task_cb, acb); 187 188 while (acb->status == -EINPROGRESS) { 189 qemu_aio_wait(); 190 } 191 } 192 193 static const AIOCBInfo iscsi_aiocb_info = { 194 .aiocb_size = sizeof(IscsiAIOCB), 195 .cancel = iscsi_aio_cancel, 196 }; 197 198 199 static void iscsi_process_read(void *arg); 200 static void iscsi_process_write(void *arg); 201 202 static void 203 iscsi_set_events(IscsiLun *iscsilun) 204 { 205 struct iscsi_context *iscsi = iscsilun->iscsi; 206 int ev; 207 208 /* We always register a read handler. */ 209 ev = POLLIN; 210 ev |= iscsi_which_events(iscsi); 211 if (ev != iscsilun->events) { 212 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), 213 iscsi_process_read, 214 (ev & POLLOUT) ? iscsi_process_write : NULL, 215 iscsilun); 216 217 } 218 219 iscsilun->events = ev; 220 } 221 222 static void 223 iscsi_process_read(void *arg) 224 { 225 IscsiLun *iscsilun = arg; 226 struct iscsi_context *iscsi = iscsilun->iscsi; 227 228 iscsi_service(iscsi, POLLIN); 229 iscsi_set_events(iscsilun); 230 } 231 232 static void 233 iscsi_process_write(void *arg) 234 { 235 IscsiLun *iscsilun = arg; 236 struct iscsi_context *iscsi = iscsilun->iscsi; 237 238 iscsi_service(iscsi, POLLOUT); 239 iscsi_set_events(iscsilun); 240 } 241 242 static int 243 iscsi_aio_writev_acb(IscsiAIOCB *acb); 244 245 static void 246 iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status, 247 void *command_data, void *opaque) 248 { 249 IscsiAIOCB *acb = opaque; 250 251 trace_iscsi_aio_write16_cb(iscsi, status, acb, acb->canceled); 252 253 g_free(acb->buf); 254 acb->buf = NULL; 255 256 if (acb->canceled != 0) { 257 return; 258 } 259 260 acb->status = 0; 261 if (status != 0) { 262 if (status == SCSI_STATUS_CHECK_CONDITION 263 && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION 264 && acb->retries-- > 0) { 265 scsi_free_scsi_task(acb->task); 266 acb->task = NULL; 267 if (iscsi_aio_writev_acb(acb) == 0) { 268 iscsi_set_events(acb->iscsilun); 269 return; 270 } 271 } 272 error_report("Failed to write16 data to iSCSI lun. %s", 273 iscsi_get_error(iscsi)); 274 acb->status = -EIO; 275 } 276 277 iscsi_schedule_bh(acb); 278 } 279 280 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun) 281 { 282 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE; 283 } 284 285 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun) 286 { 287 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size; 288 } 289 290 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors, 291 IscsiLun *iscsilun) 292 { 293 if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size || 294 (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) { 295 error_report("iSCSI misaligned request: " 296 "iscsilun->block_size %u, sector_num %" PRIi64 297 ", nb_sectors %d", 298 iscsilun->block_size, sector_num, nb_sectors); 299 return 0; 300 } 301 return 1; 302 } 303 304 static int 305 iscsi_aio_writev_acb(IscsiAIOCB *acb) 306 { 307 struct iscsi_context *iscsi = acb->iscsilun->iscsi; 308 size_t size; 309 uint32_t num_sectors; 310 uint64_t lba; 311 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 312 struct iscsi_data data; 313 #endif 314 int ret; 315 316 acb->canceled = 0; 317 acb->bh = NULL; 318 acb->status = -EINPROGRESS; 319 acb->buf = NULL; 320 321 /* this will allow us to get rid of 'buf' completely */ 322 size = acb->nb_sectors * BDRV_SECTOR_SIZE; 323 324 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 325 data.size = MIN(size, acb->qiov->size); 326 327 /* if the iovec only contains one buffer we can pass it directly */ 328 if (acb->qiov->niov == 1) { 329 data.data = acb->qiov->iov[0].iov_base; 330 } else { 331 acb->buf = g_malloc(data.size); 332 qemu_iovec_to_buf(acb->qiov, 0, acb->buf, data.size); 333 data.data = acb->buf; 334 } 335 #endif 336 337 acb->task = malloc(sizeof(struct scsi_task)); 338 if (acb->task == NULL) { 339 error_report("iSCSI: Failed to allocate task for scsi WRITE16 " 340 "command. %s", iscsi_get_error(iscsi)); 341 return -1; 342 } 343 memset(acb->task, 0, sizeof(struct scsi_task)); 344 345 acb->task->xfer_dir = SCSI_XFER_WRITE; 346 acb->task->cdb_size = 16; 347 acb->task->cdb[0] = 0x8a; 348 lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); 349 *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); 350 *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); 351 num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); 352 *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors); 353 acb->task->expxferlen = size; 354 355 #if defined(LIBISCSI_FEATURE_IOVECTOR) 356 ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, 357 iscsi_aio_write16_cb, 358 NULL, 359 acb); 360 #else 361 ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, 362 iscsi_aio_write16_cb, 363 &data, 364 acb); 365 #endif 366 if (ret != 0) { 367 scsi_free_scsi_task(acb->task); 368 g_free(acb->buf); 369 return -1; 370 } 371 372 #if defined(LIBISCSI_FEATURE_IOVECTOR) 373 scsi_task_set_iov_out(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov); 374 #endif 375 376 return 0; 377 } 378 379 static BlockDriverAIOCB * 380 iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num, 381 QEMUIOVector *qiov, int nb_sectors, 382 BlockDriverCompletionFunc *cb, 383 void *opaque) 384 { 385 IscsiLun *iscsilun = bs->opaque; 386 IscsiAIOCB *acb; 387 388 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 389 return NULL; 390 } 391 392 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 393 trace_iscsi_aio_writev(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); 394 395 acb->iscsilun = iscsilun; 396 acb->qiov = qiov; 397 acb->nb_sectors = nb_sectors; 398 acb->sector_num = sector_num; 399 acb->retries = ISCSI_CMD_RETRIES; 400 401 if (iscsi_aio_writev_acb(acb) != 0) { 402 qemu_aio_release(acb); 403 return NULL; 404 } 405 406 iscsi_set_events(iscsilun); 407 return &acb->common; 408 } 409 410 static int 411 iscsi_aio_readv_acb(IscsiAIOCB *acb); 412 413 static void 414 iscsi_aio_read16_cb(struct iscsi_context *iscsi, int status, 415 void *command_data, void *opaque) 416 { 417 IscsiAIOCB *acb = opaque; 418 419 trace_iscsi_aio_read16_cb(iscsi, status, acb, acb->canceled); 420 421 if (acb->canceled != 0) { 422 return; 423 } 424 425 acb->status = 0; 426 if (status != 0) { 427 if (status == SCSI_STATUS_CHECK_CONDITION 428 && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION 429 && acb->retries-- > 0) { 430 scsi_free_scsi_task(acb->task); 431 acb->task = NULL; 432 if (iscsi_aio_readv_acb(acb) == 0) { 433 iscsi_set_events(acb->iscsilun); 434 return; 435 } 436 } 437 error_report("Failed to read16 data from iSCSI lun. %s", 438 iscsi_get_error(iscsi)); 439 acb->status = -EIO; 440 } 441 442 iscsi_schedule_bh(acb); 443 } 444 445 static int 446 iscsi_aio_readv_acb(IscsiAIOCB *acb) 447 { 448 struct iscsi_context *iscsi = acb->iscsilun->iscsi; 449 size_t size; 450 uint64_t lba; 451 uint32_t num_sectors; 452 int ret; 453 #if !defined(LIBISCSI_FEATURE_IOVECTOR) 454 int i; 455 #endif 456 457 acb->canceled = 0; 458 acb->bh = NULL; 459 acb->status = -EINPROGRESS; 460 acb->buf = NULL; 461 462 size = acb->nb_sectors * BDRV_SECTOR_SIZE; 463 464 acb->task = malloc(sizeof(struct scsi_task)); 465 if (acb->task == NULL) { 466 error_report("iSCSI: Failed to allocate task for scsi READ16 " 467 "command. %s", iscsi_get_error(iscsi)); 468 return -1; 469 } 470 memset(acb->task, 0, sizeof(struct scsi_task)); 471 472 acb->task->xfer_dir = SCSI_XFER_READ; 473 acb->task->expxferlen = size; 474 lba = sector_qemu2lun(acb->sector_num, acb->iscsilun); 475 num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun); 476 477 switch (acb->iscsilun->type) { 478 case TYPE_DISK: 479 acb->task->cdb_size = 16; 480 acb->task->cdb[0] = 0x88; 481 *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32); 482 *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff); 483 *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors); 484 break; 485 default: 486 acb->task->cdb_size = 10; 487 acb->task->cdb[0] = 0x28; 488 *(uint32_t *)&acb->task->cdb[2] = htonl(lba); 489 *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors); 490 break; 491 } 492 493 ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task, 494 iscsi_aio_read16_cb, 495 NULL, 496 acb); 497 if (ret != 0) { 498 scsi_free_scsi_task(acb->task); 499 return -1; 500 } 501 502 #if defined(LIBISCSI_FEATURE_IOVECTOR) 503 scsi_task_set_iov_in(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov); 504 #else 505 for (i = 0; i < acb->qiov->niov; i++) { 506 scsi_task_add_data_in_buffer(acb->task, 507 acb->qiov->iov[i].iov_len, 508 acb->qiov->iov[i].iov_base); 509 } 510 #endif 511 return 0; 512 } 513 514 static BlockDriverAIOCB * 515 iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num, 516 QEMUIOVector *qiov, int nb_sectors, 517 BlockDriverCompletionFunc *cb, 518 void *opaque) 519 { 520 IscsiLun *iscsilun = bs->opaque; 521 IscsiAIOCB *acb; 522 523 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 524 return NULL; 525 } 526 527 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 528 trace_iscsi_aio_readv(iscsilun->iscsi, sector_num, nb_sectors, opaque, acb); 529 530 acb->nb_sectors = nb_sectors; 531 acb->sector_num = sector_num; 532 acb->iscsilun = iscsilun; 533 acb->qiov = qiov; 534 acb->retries = ISCSI_CMD_RETRIES; 535 536 if (iscsi_aio_readv_acb(acb) != 0) { 537 qemu_aio_release(acb); 538 return NULL; 539 } 540 541 iscsi_set_events(iscsilun); 542 return &acb->common; 543 } 544 545 static int 546 iscsi_aio_flush_acb(IscsiAIOCB *acb); 547 548 static void 549 iscsi_synccache10_cb(struct iscsi_context *iscsi, int status, 550 void *command_data, void *opaque) 551 { 552 IscsiAIOCB *acb = opaque; 553 554 if (acb->canceled != 0) { 555 return; 556 } 557 558 acb->status = 0; 559 if (status != 0) { 560 if (status == SCSI_STATUS_CHECK_CONDITION 561 && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION 562 && acb->retries-- > 0) { 563 scsi_free_scsi_task(acb->task); 564 acb->task = NULL; 565 if (iscsi_aio_flush_acb(acb) == 0) { 566 iscsi_set_events(acb->iscsilun); 567 return; 568 } 569 } 570 error_report("Failed to sync10 data on iSCSI lun. %s", 571 iscsi_get_error(iscsi)); 572 acb->status = -EIO; 573 } 574 575 iscsi_schedule_bh(acb); 576 } 577 578 static int 579 iscsi_aio_flush_acb(IscsiAIOCB *acb) 580 { 581 struct iscsi_context *iscsi = acb->iscsilun->iscsi; 582 583 acb->canceled = 0; 584 acb->bh = NULL; 585 acb->status = -EINPROGRESS; 586 acb->buf = NULL; 587 588 acb->task = iscsi_synchronizecache10_task(iscsi, acb->iscsilun->lun, 589 0, 0, 0, 0, 590 iscsi_synccache10_cb, 591 acb); 592 if (acb->task == NULL) { 593 error_report("iSCSI: Failed to send synchronizecache10 command. %s", 594 iscsi_get_error(iscsi)); 595 return -1; 596 } 597 598 return 0; 599 } 600 601 static BlockDriverAIOCB * 602 iscsi_aio_flush(BlockDriverState *bs, 603 BlockDriverCompletionFunc *cb, void *opaque) 604 { 605 IscsiLun *iscsilun = bs->opaque; 606 607 IscsiAIOCB *acb; 608 609 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 610 611 acb->iscsilun = iscsilun; 612 acb->retries = ISCSI_CMD_RETRIES; 613 614 if (iscsi_aio_flush_acb(acb) != 0) { 615 qemu_aio_release(acb); 616 return NULL; 617 } 618 619 iscsi_set_events(iscsilun); 620 621 return &acb->common; 622 } 623 624 #ifdef __linux__ 625 static void 626 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status, 627 void *command_data, void *opaque) 628 { 629 IscsiAIOCB *acb = opaque; 630 631 g_free(acb->buf); 632 acb->buf = NULL; 633 634 if (acb->canceled != 0) { 635 return; 636 } 637 638 acb->status = 0; 639 if (status < 0) { 640 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s", 641 iscsi_get_error(iscsi)); 642 acb->status = -EIO; 643 } 644 645 acb->ioh->driver_status = 0; 646 acb->ioh->host_status = 0; 647 acb->ioh->resid = 0; 648 649 #define SG_ERR_DRIVER_SENSE 0x08 650 651 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) { 652 int ss; 653 654 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE; 655 656 acb->ioh->sb_len_wr = acb->task->datain.size - 2; 657 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ? 658 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr; 659 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss); 660 } 661 662 iscsi_schedule_bh(acb); 663 } 664 665 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, 666 unsigned long int req, void *buf, 667 BlockDriverCompletionFunc *cb, void *opaque) 668 { 669 IscsiLun *iscsilun = bs->opaque; 670 struct iscsi_context *iscsi = iscsilun->iscsi; 671 struct iscsi_data data; 672 IscsiAIOCB *acb; 673 674 assert(req == SG_IO); 675 676 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque); 677 678 acb->iscsilun = iscsilun; 679 acb->canceled = 0; 680 acb->bh = NULL; 681 acb->status = -EINPROGRESS; 682 acb->buf = NULL; 683 acb->ioh = buf; 684 685 acb->task = malloc(sizeof(struct scsi_task)); 686 if (acb->task == NULL) { 687 error_report("iSCSI: Failed to allocate task for scsi command. %s", 688 iscsi_get_error(iscsi)); 689 qemu_aio_release(acb); 690 return NULL; 691 } 692 memset(acb->task, 0, sizeof(struct scsi_task)); 693 694 switch (acb->ioh->dxfer_direction) { 695 case SG_DXFER_TO_DEV: 696 acb->task->xfer_dir = SCSI_XFER_WRITE; 697 break; 698 case SG_DXFER_FROM_DEV: 699 acb->task->xfer_dir = SCSI_XFER_READ; 700 break; 701 default: 702 acb->task->xfer_dir = SCSI_XFER_NONE; 703 break; 704 } 705 706 acb->task->cdb_size = acb->ioh->cmd_len; 707 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len); 708 acb->task->expxferlen = acb->ioh->dxfer_len; 709 710 data.size = 0; 711 if (acb->task->xfer_dir == SCSI_XFER_WRITE) { 712 if (acb->ioh->iovec_count == 0) { 713 data.data = acb->ioh->dxferp; 714 data.size = acb->ioh->dxfer_len; 715 } else { 716 #if defined(LIBISCSI_FEATURE_IOVECTOR) 717 scsi_task_set_iov_out(acb->task, 718 (struct scsi_iovec *) acb->ioh->dxferp, 719 acb->ioh->iovec_count); 720 #else 721 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 722 723 acb->buf = g_malloc(acb->ioh->dxfer_len); 724 data.data = acb->buf; 725 data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0, 726 acb->buf, acb->ioh->dxfer_len); 727 #endif 728 } 729 } 730 731 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task, 732 iscsi_aio_ioctl_cb, 733 (data.size > 0) ? &data : NULL, 734 acb) != 0) { 735 scsi_free_scsi_task(acb->task); 736 qemu_aio_release(acb); 737 return NULL; 738 } 739 740 /* tell libiscsi to read straight into the buffer we got from ioctl */ 741 if (acb->task->xfer_dir == SCSI_XFER_READ) { 742 if (acb->ioh->iovec_count == 0) { 743 scsi_task_add_data_in_buffer(acb->task, 744 acb->ioh->dxfer_len, 745 acb->ioh->dxferp); 746 } else { 747 #if defined(LIBISCSI_FEATURE_IOVECTOR) 748 scsi_task_set_iov_in(acb->task, 749 (struct scsi_iovec *) acb->ioh->dxferp, 750 acb->ioh->iovec_count); 751 #else 752 int i; 753 for (i = 0; i < acb->ioh->iovec_count; i++) { 754 struct iovec *iov = (struct iovec *)acb->ioh->dxferp; 755 756 scsi_task_add_data_in_buffer(acb->task, 757 iov[i].iov_len, 758 iov[i].iov_base); 759 } 760 #endif 761 } 762 } 763 764 iscsi_set_events(iscsilun); 765 766 return &acb->common; 767 } 768 769 770 static void ioctl_cb(void *opaque, int status) 771 { 772 int *p_status = opaque; 773 *p_status = status; 774 } 775 776 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 777 { 778 IscsiLun *iscsilun = bs->opaque; 779 int status; 780 781 switch (req) { 782 case SG_GET_VERSION_NUM: 783 *(int *)buf = 30000; 784 break; 785 case SG_GET_SCSI_ID: 786 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type; 787 break; 788 case SG_IO: 789 status = -EINPROGRESS; 790 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status); 791 792 while (status == -EINPROGRESS) { 793 qemu_aio_wait(); 794 } 795 796 return 0; 797 default: 798 return -1; 799 } 800 return 0; 801 } 802 #endif 803 804 static int64_t 805 iscsi_getlength(BlockDriverState *bs) 806 { 807 IscsiLun *iscsilun = bs->opaque; 808 int64_t len; 809 810 len = iscsilun->num_blocks; 811 len *= iscsilun->block_size; 812 813 return len; 814 } 815 816 #if defined(LIBISCSI_FEATURE_IOVECTOR) 817 818 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs, 819 int64_t sector_num, 820 int nb_sectors, int *pnum) 821 { 822 IscsiLun *iscsilun = bs->opaque; 823 struct scsi_get_lba_status *lbas = NULL; 824 struct scsi_lba_status_descriptor *lbasd = NULL; 825 struct IscsiTask iTask; 826 int64_t ret; 827 828 iscsi_co_init_iscsitask(iscsilun, &iTask); 829 830 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 831 ret = -EINVAL; 832 goto out; 833 } 834 835 /* default to all sectors allocated */ 836 ret = BDRV_BLOCK_DATA; 837 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID; 838 *pnum = nb_sectors; 839 840 /* LUN does not support logical block provisioning */ 841 if (iscsilun->lbpme == 0) { 842 goto out; 843 } 844 845 retry: 846 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun, 847 sector_qemu2lun(sector_num, iscsilun), 848 8 + 16, iscsi_co_generic_cb, 849 &iTask) == NULL) { 850 ret = -EIO; 851 goto out; 852 } 853 854 while (!iTask.complete) { 855 iscsi_set_events(iscsilun); 856 qemu_coroutine_yield(); 857 } 858 859 if (iTask.do_retry) { 860 if (iTask.task != NULL) { 861 scsi_free_scsi_task(iTask.task); 862 iTask.task = NULL; 863 } 864 goto retry; 865 } 866 867 if (iTask.status != SCSI_STATUS_GOOD) { 868 /* in case the get_lba_status_callout fails (i.e. 869 * because the device is busy or the cmd is not 870 * supported) we pretend all blocks are allocated 871 * for backwards compatibility */ 872 goto out; 873 } 874 875 lbas = scsi_datain_unmarshall(iTask.task); 876 if (lbas == NULL) { 877 ret = -EIO; 878 goto out; 879 } 880 881 lbasd = &lbas->descriptors[0]; 882 883 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) { 884 ret = -EIO; 885 goto out; 886 } 887 888 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun); 889 if (*pnum > nb_sectors) { 890 *pnum = nb_sectors; 891 } 892 893 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED || 894 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) { 895 ret &= ~BDRV_BLOCK_DATA; 896 if (iscsilun->lbprz) { 897 ret |= BDRV_BLOCK_ZERO; 898 } 899 } 900 901 out: 902 if (iTask.task != NULL) { 903 scsi_free_scsi_task(iTask.task); 904 } 905 return ret; 906 } 907 908 #endif /* LIBISCSI_FEATURE_IOVECTOR */ 909 910 static int 911 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num, 912 int nb_sectors) 913 { 914 IscsiLun *iscsilun = bs->opaque; 915 struct IscsiTask iTask; 916 struct unmap_list list; 917 918 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 919 return -EINVAL; 920 } 921 922 if (!iscsilun->lbp.lbpu) { 923 /* UNMAP is not supported by the target */ 924 return 0; 925 } 926 927 list.lba = sector_qemu2lun(sector_num, iscsilun); 928 list.num = sector_qemu2lun(nb_sectors, iscsilun); 929 930 iscsi_co_init_iscsitask(iscsilun, &iTask); 931 retry: 932 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1, 933 iscsi_co_generic_cb, &iTask) == NULL) { 934 return -EIO; 935 } 936 937 while (!iTask.complete) { 938 iscsi_set_events(iscsilun); 939 qemu_coroutine_yield(); 940 } 941 942 if (iTask.task != NULL) { 943 scsi_free_scsi_task(iTask.task); 944 iTask.task = NULL; 945 } 946 947 if (iTask.do_retry) { 948 goto retry; 949 } 950 951 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) { 952 /* the target might fail with a check condition if it 953 is not happy with the alignment of the UNMAP request 954 we silently fail in this case */ 955 return 0; 956 } 957 958 if (iTask.status != SCSI_STATUS_GOOD) { 959 return -EIO; 960 } 961 962 return 0; 963 } 964 965 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 966 967 static int 968 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 969 int nb_sectors, BdrvRequestFlags flags) 970 { 971 IscsiLun *iscsilun = bs->opaque; 972 struct IscsiTask iTask; 973 uint64_t lba; 974 uint32_t nb_blocks; 975 976 if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { 977 return -EINVAL; 978 } 979 980 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) { 981 /* WRITE SAME without UNMAP is not supported by the target */ 982 return -ENOTSUP; 983 } 984 985 if ((flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->lbp.lbpws) { 986 /* WRITE SAME with UNMAP is not supported by the target */ 987 return -ENOTSUP; 988 } 989 990 lba = sector_qemu2lun(sector_num, iscsilun); 991 nb_blocks = sector_qemu2lun(nb_sectors, iscsilun); 992 993 if (iscsilun->zeroblock == NULL) { 994 iscsilun->zeroblock = g_malloc0(iscsilun->block_size); 995 } 996 997 iscsi_co_init_iscsitask(iscsilun, &iTask); 998 retry: 999 if (iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba, 1000 iscsilun->zeroblock, iscsilun->block_size, 1001 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP), 1002 0, 0, iscsi_co_generic_cb, &iTask) == NULL) { 1003 return -EIO; 1004 } 1005 1006 while (!iTask.complete) { 1007 iscsi_set_events(iscsilun); 1008 qemu_coroutine_yield(); 1009 } 1010 1011 if (iTask.task != NULL) { 1012 scsi_free_scsi_task(iTask.task); 1013 iTask.task = NULL; 1014 } 1015 1016 if (iTask.do_retry) { 1017 goto retry; 1018 } 1019 1020 if (iTask.status != SCSI_STATUS_GOOD) { 1021 if (iTask.status == SCSI_STATUS_CHECK_CONDITION && 1022 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST && 1023 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) { 1024 /* WRITE SAME is not supported by the target */ 1025 iscsilun->has_write_same = false; 1026 return -ENOTSUP; 1027 } 1028 1029 return -EIO; 1030 } 1031 1032 return 0; 1033 } 1034 1035 #endif /* SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED */ 1036 1037 static int parse_chap(struct iscsi_context *iscsi, const char *target) 1038 { 1039 QemuOptsList *list; 1040 QemuOpts *opts; 1041 const char *user = NULL; 1042 const char *password = NULL; 1043 1044 list = qemu_find_opts("iscsi"); 1045 if (!list) { 1046 return 0; 1047 } 1048 1049 opts = qemu_opts_find(list, target); 1050 if (opts == NULL) { 1051 opts = QTAILQ_FIRST(&list->head); 1052 if (!opts) { 1053 return 0; 1054 } 1055 } 1056 1057 user = qemu_opt_get(opts, "user"); 1058 if (!user) { 1059 return 0; 1060 } 1061 1062 password = qemu_opt_get(opts, "password"); 1063 if (!password) { 1064 error_report("CHAP username specified but no password was given"); 1065 return -1; 1066 } 1067 1068 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) { 1069 error_report("Failed to set initiator username and password"); 1070 return -1; 1071 } 1072 1073 return 0; 1074 } 1075 1076 static void parse_header_digest(struct iscsi_context *iscsi, const char *target) 1077 { 1078 QemuOptsList *list; 1079 QemuOpts *opts; 1080 const char *digest = NULL; 1081 1082 list = qemu_find_opts("iscsi"); 1083 if (!list) { 1084 return; 1085 } 1086 1087 opts = qemu_opts_find(list, target); 1088 if (opts == NULL) { 1089 opts = QTAILQ_FIRST(&list->head); 1090 if (!opts) { 1091 return; 1092 } 1093 } 1094 1095 digest = qemu_opt_get(opts, "header-digest"); 1096 if (!digest) { 1097 return; 1098 } 1099 1100 if (!strcmp(digest, "CRC32C")) { 1101 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C); 1102 } else if (!strcmp(digest, "NONE")) { 1103 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE); 1104 } else if (!strcmp(digest, "CRC32C-NONE")) { 1105 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE); 1106 } else if (!strcmp(digest, "NONE-CRC32C")) { 1107 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1108 } else { 1109 error_report("Invalid header-digest setting : %s", digest); 1110 } 1111 } 1112 1113 static char *parse_initiator_name(const char *target) 1114 { 1115 QemuOptsList *list; 1116 QemuOpts *opts; 1117 const char *name; 1118 char *iscsi_name; 1119 UuidInfo *uuid_info; 1120 1121 list = qemu_find_opts("iscsi"); 1122 if (list) { 1123 opts = qemu_opts_find(list, target); 1124 if (!opts) { 1125 opts = QTAILQ_FIRST(&list->head); 1126 } 1127 if (opts) { 1128 name = qemu_opt_get(opts, "initiator-name"); 1129 if (name) { 1130 return g_strdup(name); 1131 } 1132 } 1133 } 1134 1135 uuid_info = qmp_query_uuid(NULL); 1136 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) { 1137 name = qemu_get_vm_name(); 1138 } else { 1139 name = uuid_info->UUID; 1140 } 1141 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s", 1142 name ? ":" : "", name ? name : ""); 1143 qapi_free_UuidInfo(uuid_info); 1144 return iscsi_name; 1145 } 1146 1147 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1148 static void iscsi_nop_timed_event(void *opaque) 1149 { 1150 IscsiLun *iscsilun = opaque; 1151 1152 if (iscsi_get_nops_in_flight(iscsilun->iscsi) > MAX_NOP_FAILURES) { 1153 error_report("iSCSI: NOP timeout. Reconnecting..."); 1154 iscsi_reconnect(iscsilun->iscsi); 1155 } 1156 1157 if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) { 1158 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages."); 1159 return; 1160 } 1161 1162 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1163 iscsi_set_events(iscsilun); 1164 } 1165 #endif 1166 1167 static int iscsi_readcapacity_sync(IscsiLun *iscsilun) 1168 { 1169 struct scsi_task *task = NULL; 1170 struct scsi_readcapacity10 *rc10 = NULL; 1171 struct scsi_readcapacity16 *rc16 = NULL; 1172 int ret = 0; 1173 int retries = ISCSI_CMD_RETRIES; 1174 1175 do { 1176 if (task != NULL) { 1177 scsi_free_scsi_task(task); 1178 task = NULL; 1179 } 1180 1181 switch (iscsilun->type) { 1182 case TYPE_DISK: 1183 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun); 1184 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1185 rc16 = scsi_datain_unmarshall(task); 1186 if (rc16 == NULL) { 1187 error_report("iSCSI: Failed to unmarshall readcapacity16 data."); 1188 ret = -EINVAL; 1189 } else { 1190 iscsilun->block_size = rc16->block_length; 1191 iscsilun->num_blocks = rc16->returned_lba + 1; 1192 iscsilun->lbpme = rc16->lbpme; 1193 iscsilun->lbprz = rc16->lbprz; 1194 } 1195 } 1196 break; 1197 case TYPE_ROM: 1198 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0); 1199 if (task != NULL && task->status == SCSI_STATUS_GOOD) { 1200 rc10 = scsi_datain_unmarshall(task); 1201 if (rc10 == NULL) { 1202 error_report("iSCSI: Failed to unmarshall readcapacity10 data."); 1203 ret = -EINVAL; 1204 } else { 1205 iscsilun->block_size = rc10->block_size; 1206 if (rc10->lba == 0) { 1207 /* blank disk loaded */ 1208 iscsilun->num_blocks = 0; 1209 } else { 1210 iscsilun->num_blocks = rc10->lba + 1; 1211 } 1212 } 1213 } 1214 break; 1215 default: 1216 return 0; 1217 } 1218 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION 1219 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION 1220 && retries-- > 0); 1221 1222 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1223 error_report("iSCSI: failed to send readcapacity10 command."); 1224 ret = -EINVAL; 1225 } 1226 if (task) { 1227 scsi_free_scsi_task(task); 1228 } 1229 return ret; 1230 } 1231 1232 /* TODO Convert to fine grained options */ 1233 static QemuOptsList runtime_opts = { 1234 .name = "iscsi", 1235 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 1236 .desc = { 1237 { 1238 .name = "filename", 1239 .type = QEMU_OPT_STRING, 1240 .help = "URL to the iscsi image", 1241 }, 1242 { /* end of list */ } 1243 }, 1244 }; 1245 1246 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, 1247 int lun, int evpd, int pc) { 1248 int full_size; 1249 struct scsi_task *task = NULL; 1250 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64); 1251 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1252 goto fail; 1253 } 1254 full_size = scsi_datain_getfullsize(task); 1255 if (full_size > task->datain.size) { 1256 scsi_free_scsi_task(task); 1257 1258 /* we need more data for the full list */ 1259 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size); 1260 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1261 goto fail; 1262 } 1263 } 1264 1265 return task; 1266 1267 fail: 1268 error_report("iSCSI: Inquiry command failed : %s", 1269 iscsi_get_error(iscsi)); 1270 if (task) { 1271 scsi_free_scsi_task(task); 1272 return NULL; 1273 } 1274 return NULL; 1275 } 1276 1277 /* 1278 * We support iscsi url's on the form 1279 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun> 1280 */ 1281 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, 1282 Error **errp) 1283 { 1284 IscsiLun *iscsilun = bs->opaque; 1285 struct iscsi_context *iscsi = NULL; 1286 struct iscsi_url *iscsi_url = NULL; 1287 struct scsi_task *task = NULL; 1288 struct scsi_inquiry_standard *inq = NULL; 1289 char *initiator_name = NULL; 1290 QemuOpts *opts; 1291 Error *local_err = NULL; 1292 const char *filename; 1293 int ret; 1294 1295 if ((BDRV_SECTOR_SIZE % 512) != 0) { 1296 error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. " 1297 "BDRV_SECTOR_SIZE(%lld) is not a multiple " 1298 "of 512", BDRV_SECTOR_SIZE); 1299 return -EINVAL; 1300 } 1301 1302 opts = qemu_opts_create_nofail(&runtime_opts); 1303 qemu_opts_absorb_qdict(opts, options, &local_err); 1304 if (error_is_set(&local_err)) { 1305 qerror_report_err(local_err); 1306 error_free(local_err); 1307 ret = -EINVAL; 1308 goto out; 1309 } 1310 1311 filename = qemu_opt_get(opts, "filename"); 1312 1313 1314 iscsi_url = iscsi_parse_full_url(iscsi, filename); 1315 if (iscsi_url == NULL) { 1316 error_report("Failed to parse URL : %s", filename); 1317 ret = -EINVAL; 1318 goto out; 1319 } 1320 1321 memset(iscsilun, 0, sizeof(IscsiLun)); 1322 1323 initiator_name = parse_initiator_name(iscsi_url->target); 1324 1325 iscsi = iscsi_create_context(initiator_name); 1326 if (iscsi == NULL) { 1327 error_report("iSCSI: Failed to create iSCSI context."); 1328 ret = -ENOMEM; 1329 goto out; 1330 } 1331 1332 if (iscsi_set_targetname(iscsi, iscsi_url->target)) { 1333 error_report("iSCSI: Failed to set target name."); 1334 ret = -EINVAL; 1335 goto out; 1336 } 1337 1338 if (iscsi_url->user != NULL) { 1339 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, 1340 iscsi_url->passwd); 1341 if (ret != 0) { 1342 error_report("Failed to set initiator username and password"); 1343 ret = -EINVAL; 1344 goto out; 1345 } 1346 } 1347 1348 /* check if we got CHAP username/password via the options */ 1349 if (parse_chap(iscsi, iscsi_url->target) != 0) { 1350 error_report("iSCSI: Failed to set CHAP user/password"); 1351 ret = -EINVAL; 1352 goto out; 1353 } 1354 1355 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) { 1356 error_report("iSCSI: Failed to set session type to normal."); 1357 ret = -EINVAL; 1358 goto out; 1359 } 1360 1361 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C); 1362 1363 /* check if we got HEADER_DIGEST via the options */ 1364 parse_header_digest(iscsi, iscsi_url->target); 1365 1366 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) { 1367 error_report("iSCSI: Failed to connect to LUN : %s", 1368 iscsi_get_error(iscsi)); 1369 ret = -EINVAL; 1370 goto out; 1371 } 1372 1373 iscsilun->iscsi = iscsi; 1374 iscsilun->lun = iscsi_url->lun; 1375 1376 task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36); 1377 1378 if (task == NULL || task->status != SCSI_STATUS_GOOD) { 1379 error_report("iSCSI: failed to send inquiry command."); 1380 ret = -EINVAL; 1381 goto out; 1382 } 1383 1384 inq = scsi_datain_unmarshall(task); 1385 if (inq == NULL) { 1386 error_report("iSCSI: Failed to unmarshall inquiry data."); 1387 ret = -EINVAL; 1388 goto out; 1389 } 1390 1391 iscsilun->type = inq->periperal_device_type; 1392 iscsilun->has_write_same = true; 1393 1394 if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { 1395 goto out; 1396 } 1397 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun); 1398 1399 /* Medium changer or tape. We dont have any emulation for this so this must 1400 * be sg ioctl compatible. We force it to be sg, otherwise qemu will try 1401 * to read from the device to guess the image format. 1402 */ 1403 if (iscsilun->type == TYPE_MEDIUM_CHANGER || 1404 iscsilun->type == TYPE_TAPE) { 1405 bs->sg = 1; 1406 } 1407 1408 if (iscsilun->lbpme) { 1409 struct scsi_inquiry_logical_block_provisioning *inq_lbp; 1410 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1411 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING); 1412 if (task == NULL) { 1413 ret = -EINVAL; 1414 goto out; 1415 } 1416 inq_lbp = scsi_datain_unmarshall(task); 1417 if (inq_lbp == NULL) { 1418 error_report("iSCSI: failed to unmarshall inquiry datain blob"); 1419 ret = -EINVAL; 1420 goto out; 1421 } 1422 memcpy(&iscsilun->lbp, inq_lbp, 1423 sizeof(struct scsi_inquiry_logical_block_provisioning)); 1424 scsi_free_scsi_task(task); 1425 task = NULL; 1426 } 1427 1428 if (iscsilun->lbp.lbpu || iscsilun->lbp.lbpws) { 1429 struct scsi_inquiry_block_limits *inq_bl; 1430 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1, 1431 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS); 1432 if (task == NULL) { 1433 ret = -EINVAL; 1434 goto out; 1435 } 1436 inq_bl = scsi_datain_unmarshall(task); 1437 if (inq_bl == NULL) { 1438 error_report("iSCSI: failed to unmarshall inquiry datain blob"); 1439 ret = -EINVAL; 1440 goto out; 1441 } 1442 memcpy(&iscsilun->bl, inq_bl, 1443 sizeof(struct scsi_inquiry_block_limits)); 1444 scsi_free_scsi_task(task); 1445 task = NULL; 1446 1447 if (iscsilun->bl.max_unmap < 0xffffffff) { 1448 bs->bl.max_discard = sector_lun2qemu(iscsilun->bl.max_unmap, 1449 iscsilun); 1450 } 1451 bs->bl.discard_alignment = sector_lun2qemu(iscsilun->bl.opt_unmap_gran, 1452 iscsilun); 1453 1454 if (iscsilun->bl.max_ws_len < 0xffffffff) { 1455 bs->bl.max_write_zeroes = sector_lun2qemu(iscsilun->bl.max_ws_len, 1456 iscsilun); 1457 } 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 } 1464 1465 #if defined(LIBISCSI_FEATURE_NOP_COUNTER) 1466 /* Set up a timer for sending out iSCSI NOPs */ 1467 iscsilun->nop_timer = timer_new_ms(QEMU_CLOCK_REALTIME, iscsi_nop_timed_event, iscsilun); 1468 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL); 1469 #endif 1470 1471 out: 1472 qemu_opts_del(opts); 1473 if (initiator_name != NULL) { 1474 g_free(initiator_name); 1475 } 1476 if (iscsi_url != NULL) { 1477 iscsi_destroy_url(iscsi_url); 1478 } 1479 if (task != NULL) { 1480 scsi_free_scsi_task(task); 1481 } 1482 1483 if (ret) { 1484 if (iscsi != NULL) { 1485 iscsi_destroy_context(iscsi); 1486 } 1487 memset(iscsilun, 0, sizeof(IscsiLun)); 1488 } 1489 return ret; 1490 } 1491 1492 static void iscsi_close(BlockDriverState *bs) 1493 { 1494 IscsiLun *iscsilun = bs->opaque; 1495 struct iscsi_context *iscsi = iscsilun->iscsi; 1496 1497 if (iscsilun->nop_timer) { 1498 timer_del(iscsilun->nop_timer); 1499 timer_free(iscsilun->nop_timer); 1500 } 1501 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL); 1502 iscsi_destroy_context(iscsi); 1503 g_free(iscsilun->zeroblock); 1504 memset(iscsilun, 0, sizeof(IscsiLun)); 1505 } 1506 1507 static int iscsi_truncate(BlockDriverState *bs, int64_t offset) 1508 { 1509 IscsiLun *iscsilun = bs->opaque; 1510 int ret = 0; 1511 1512 if (iscsilun->type != TYPE_DISK) { 1513 return -ENOTSUP; 1514 } 1515 1516 if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) { 1517 return ret; 1518 } 1519 1520 if (offset > iscsi_getlength(bs)) { 1521 return -EINVAL; 1522 } 1523 1524 return 0; 1525 } 1526 1527 static int iscsi_create(const char *filename, QEMUOptionParameter *options, 1528 Error **errp) 1529 { 1530 int ret = 0; 1531 int64_t total_size = 0; 1532 BlockDriverState *bs; 1533 IscsiLun *iscsilun = NULL; 1534 QDict *bs_options; 1535 1536 bs = bdrv_new(""); 1537 1538 /* Read out options */ 1539 while (options && options->name) { 1540 if (!strcmp(options->name, "size")) { 1541 total_size = options->value.n / BDRV_SECTOR_SIZE; 1542 } 1543 options++; 1544 } 1545 1546 bs->opaque = g_malloc0(sizeof(struct IscsiLun)); 1547 iscsilun = bs->opaque; 1548 1549 bs_options = qdict_new(); 1550 qdict_put(bs_options, "filename", qstring_from_str(filename)); 1551 ret = iscsi_open(bs, bs_options, 0, NULL); 1552 QDECREF(bs_options); 1553 1554 if (ret != 0) { 1555 goto out; 1556 } 1557 if (iscsilun->nop_timer) { 1558 timer_del(iscsilun->nop_timer); 1559 timer_free(iscsilun->nop_timer); 1560 } 1561 if (iscsilun->type != TYPE_DISK) { 1562 ret = -ENODEV; 1563 goto out; 1564 } 1565 if (bs->total_sectors < total_size) { 1566 ret = -ENOSPC; 1567 goto out; 1568 } 1569 1570 ret = 0; 1571 out: 1572 if (iscsilun->iscsi != NULL) { 1573 iscsi_destroy_context(iscsilun->iscsi); 1574 } 1575 g_free(bs->opaque); 1576 bs->opaque = NULL; 1577 bdrv_unref(bs); 1578 return ret; 1579 } 1580 1581 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1582 { 1583 IscsiLun *iscsilun = bs->opaque; 1584 bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz; 1585 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws; 1586 /* Guess the internal cluster (page) size of the iscsi target by the means 1587 * of opt_unmap_gran. Transfer the unmap granularity only if it has a 1588 * reasonable size for bdi->cluster_size */ 1589 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 && 1590 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) { 1591 bdi->cluster_size = iscsilun->bl.opt_unmap_gran * iscsilun->block_size; 1592 } 1593 return 0; 1594 } 1595 1596 static QEMUOptionParameter iscsi_create_options[] = { 1597 { 1598 .name = BLOCK_OPT_SIZE, 1599 .type = OPT_SIZE, 1600 .help = "Virtual disk size" 1601 }, 1602 { NULL } 1603 }; 1604 1605 static BlockDriver bdrv_iscsi = { 1606 .format_name = "iscsi", 1607 .protocol_name = "iscsi", 1608 1609 .instance_size = sizeof(IscsiLun), 1610 .bdrv_needs_filename = true, 1611 .bdrv_file_open = iscsi_open, 1612 .bdrv_close = iscsi_close, 1613 .bdrv_create = iscsi_create, 1614 .create_options = iscsi_create_options, 1615 1616 .bdrv_getlength = iscsi_getlength, 1617 .bdrv_get_info = iscsi_get_info, 1618 .bdrv_truncate = iscsi_truncate, 1619 1620 #if defined(LIBISCSI_FEATURE_IOVECTOR) 1621 .bdrv_co_get_block_status = iscsi_co_get_block_status, 1622 #endif 1623 .bdrv_co_discard = iscsi_co_discard, 1624 #if defined(SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED) 1625 .bdrv_co_write_zeroes = iscsi_co_write_zeroes, 1626 #endif 1627 1628 .bdrv_aio_readv = iscsi_aio_readv, 1629 .bdrv_aio_writev = iscsi_aio_writev, 1630 .bdrv_aio_flush = iscsi_aio_flush, 1631 1632 #ifdef __linux__ 1633 .bdrv_ioctl = iscsi_ioctl, 1634 .bdrv_aio_ioctl = iscsi_aio_ioctl, 1635 #endif 1636 }; 1637 1638 static QemuOptsList qemu_iscsi_opts = { 1639 .name = "iscsi", 1640 .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head), 1641 .desc = { 1642 { 1643 .name = "user", 1644 .type = QEMU_OPT_STRING, 1645 .help = "username for CHAP authentication to target", 1646 },{ 1647 .name = "password", 1648 .type = QEMU_OPT_STRING, 1649 .help = "password for CHAP authentication to target", 1650 },{ 1651 .name = "header-digest", 1652 .type = QEMU_OPT_STRING, 1653 .help = "HeaderDigest setting. " 1654 "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}", 1655 },{ 1656 .name = "initiator-name", 1657 .type = QEMU_OPT_STRING, 1658 .help = "Initiator iqn name to use when connecting", 1659 }, 1660 { /* end of list */ } 1661 }, 1662 }; 1663 1664 static void iscsi_block_init(void) 1665 { 1666 bdrv_register(&bdrv_iscsi); 1667 qemu_add_opts(&qemu_iscsi_opts); 1668 } 1669 1670 block_init(iscsi_block_init); 1671