block/iscsi.c

   1 /*
   2  * QEMU Block driver for iSCSI images
   3  *
   4  * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
   5  * Copyright (c) 2012-2015 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 "qemu/osdep.h"
  27
  28 #include <poll.h>
  29 #include <math.h>
  30 #include <arpa/inet.h>
  31 #include "qemu-common.h"
  32 #include "qemu/config-file.h"
  33 #include "qemu/error-report.h"
  34 #include "qemu/bitops.h"
  35 #include "qemu/bitmap.h"
  36 #include "block/block_int.h"
  37 #include "block/scsi.h"
  38 #include "qemu/iov.h"
  39 #include "sysemu/sysemu.h"
  40 #include "qmp-commands.h"
  41 #include "qapi/qmp/qstring.h"
  42
  43 #include <iscsi/iscsi.h>
  44 #include <iscsi/scsi-lowlevel.h>
  45
  46 #ifdef __linux__
  47 #include <scsi/sg.h>
  48 #include <block/scsi.h>
  49 #endif
  50
  51 typedef struct IscsiLun {
  52     struct iscsi_context *iscsi;
  53     AioContext *aio_context;
  54     int lun;
  55     enum scsi_inquiry_peripheral_device_type type;
  56     int block_size;
  57     uint64_t num_blocks;
  58     int events;
  59     QEMUTimer *nop_timer;
  60     QEMUTimer *event_timer;
  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     bool use_16_for_rw;
  67     bool write_protected;
  68     bool lbpme;
  69     bool lbprz;
  70     bool dpofua;
  71     bool has_write_same;
  72     bool force_next_flush;
  73     bool request_timed_out;
  74 } IscsiLun;
  75
  76 typedef struct IscsiTask {
  77     int status;
  78     int complete;
  79     int retries;
  80     int do_retry;
  81     struct scsi_task *task;
  82     Coroutine *co;
  83     QEMUBH *bh;
  84     IscsiLun *iscsilun;
  85     QEMUTimer retry_timer;
  86     bool force_next_flush;
  87     int err_code;
  88 } IscsiTask;
  89
  90 typedef struct IscsiAIOCB {
  91     BlockAIOCB common;
  92     QEMUIOVector *qiov;
  93     QEMUBH *bh;
  94     IscsiLun *iscsilun;
  95     struct scsi_task *task;
  96     uint8_t *buf;
  97     int status;
  98     int64_t sector_num;
  99     int nb_sectors;
 100     int ret;
 101 #ifdef __linux__
 102     sg_io_hdr_t *ioh;
 103 #endif
 104 } IscsiAIOCB;
 105
 106 /* libiscsi uses time_t so its enough to process events every second */
 107 #define EVENT_INTERVAL 1000
 108 #define NOP_INTERVAL 5000
 109 #define MAX_NOP_FAILURES 3
 110 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
 111 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
 112
 113 /* this threshold is a trade-off knob to choose between
 114  * the potential additional overhead of an extra GET_LBA_STATUS request
 115  * vs. unnecessarily reading a lot of zero sectors over the wire.
 116  * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
 117  * sectors we check the allocation status of the area covered by the
 118  * request first if the allocationmap indicates that the area might be
 119  * unallocated. */
 120 #define ISCSI_CHECKALLOC_THRES 64
 121
 122 static void
 123 iscsi_bh_cb(void *p)
 124 {
 125     IscsiAIOCB *acb = p;
 126
 127     qemu_bh_delete(acb->bh);
 128
 129     g_free(acb->buf);
 130     acb->buf = NULL;
 131
 132     acb->common.cb(acb->common.opaque, acb->status);
 133
 134     if (acb->task != NULL) {
 135         scsi_free_scsi_task(acb->task);
 136         acb->task = NULL;
 137     }
 138
 139     qemu_aio_unref(acb);
 140 }
 141
 142 static void
 143 iscsi_schedule_bh(IscsiAIOCB *acb)
 144 {
 145     if (acb->bh) {
 146         return;
 147     }
 148     acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
 149     qemu_bh_schedule(acb->bh);
 150 }
 151
 152 static void iscsi_co_generic_bh_cb(void *opaque)
 153 {
 154     struct IscsiTask *iTask = opaque;
 155     iTask->complete = 1;
 156     qemu_bh_delete(iTask->bh);
 157     qemu_coroutine_enter(iTask->co, NULL);
 158 }
 159
 160 static void iscsi_retry_timer_expired(void *opaque)
 161 {
 162     struct IscsiTask *iTask = opaque;
 163     iTask->complete = 1;
 164     if (iTask->co) {
 165         qemu_coroutine_enter(iTask->co, NULL);
 166     }
 167 }
 168
 169 static inline unsigned exp_random(double mean)
 170 {
 171     return -mean * log((double)rand() / RAND_MAX);
 172 }
 173
 174 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
 175  * libiscsi 1.10.0, together with other constants we need.  Use it as
 176  * a hint that we have to define them ourselves if needed, to keep the
 177  * minimum required libiscsi version at 1.9.0.  We use an ASCQ macro for
 178  * the test because SCSI_STATUS_* is an enum.
 179  *
 180  * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
 181  * an enum, check against the LIBISCSI_API_VERSION macro, which was
 182  * introduced in 1.11.0.  If it is present, there is no need to define
 183  * anything.
 184  */
 185 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
 186     !defined(LIBISCSI_API_VERSION)
 187 #define SCSI_STATUS_TASK_SET_FULL                          0x28
 188 #define SCSI_STATUS_TIMEOUT                                0x0f000002
 189 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST    0x2600
 190 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR        0x1a00
 191 #endif
 192
 193 static int iscsi_translate_sense(struct scsi_sense *sense)
 194 {
 195     int ret;
 196
 197     switch (sense->key) {
 198     case SCSI_SENSE_NOT_READY:
 199         return -EBUSY;
 200     case SCSI_SENSE_DATA_PROTECTION:
 201         return -EACCES;
 202     case SCSI_SENSE_COMMAND_ABORTED:
 203         return -ECANCELED;
 204     case SCSI_SENSE_ILLEGAL_REQUEST:
 205         /* Parse ASCQ */
 206         break;
 207     default:
 208         return -EIO;
 209     }
 210     switch (sense->ascq) {
 211     case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR:
 212     case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE:
 213     case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB:
 214     case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST:
 215         ret = -EINVAL;
 216         break;
 217     case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE:
 218         ret = -ENOSPC;
 219         break;
 220     case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED:
 221         ret = -ENOTSUP;
 222         break;
 223     case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT:
 224     case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED:
 225     case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN:
 226         ret = -ENOMEDIUM;
 227         break;
 228     case SCSI_SENSE_ASCQ_WRITE_PROTECTED:
 229         ret = -EACCES;
 230         break;
 231     default:
 232         ret = -EIO;
 233         break;
 234     }
 235     return ret;
 236 }
 237
 238 static void
 239 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
 240                         void *command_data, void *opaque)
 241 {
 242     struct IscsiTask *iTask = opaque;
 243     struct scsi_task *task = command_data;
 244
 245     iTask->status = status;
 246     iTask->do_retry = 0;
 247     iTask->task = task;
 248
 249     if (status != SCSI_STATUS_GOOD) {
 250         if (iTask->retries++ < ISCSI_CMD_RETRIES) {
 251             if (status == SCSI_STATUS_CHECK_CONDITION
 252                 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
 253                 error_report("iSCSI CheckCondition: %s",
 254                              iscsi_get_error(iscsi));
 255                 iTask->do_retry = 1;
 256                 goto out;
 257             }
 258             if (status == SCSI_STATUS_BUSY ||
 259                 status == SCSI_STATUS_TIMEOUT ||
 260                 status == SCSI_STATUS_TASK_SET_FULL) {
 261                 unsigned retry_time =
 262                     exp_random(iscsi_retry_times[iTask->retries - 1]);
 263                 if (status == SCSI_STATUS_TIMEOUT) {
 264                     /* make sure the request is rescheduled AFTER the
 265                      * reconnect is initiated */
 266                     retry_time = EVENT_INTERVAL * 2;
 267                     iTask->iscsilun->request_timed_out = true;
 268                 }
 269                 error_report("iSCSI Busy/TaskSetFull/TimeOut"
 270                              " (retry #%u in %u ms): %s",
 271                              iTask->retries, retry_time,
 272                              iscsi_get_error(iscsi));
 273                 aio_timer_init(iTask->iscsilun->aio_context,
 274                                &iTask->retry_timer, QEMU_CLOCK_REALTIME,
 275                                SCALE_MS, iscsi_retry_timer_expired, iTask);
 276                 timer_mod(&iTask->retry_timer,
 277                           qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
 278                 iTask->do_retry = 1;
 279                 return;
 280             }
 281         }
 282         iTask->err_code = iscsi_translate_sense(&task->sense);
 283         error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
 284     } else {
 285         iTask->iscsilun->force_next_flush |= iTask->force_next_flush;
 286     }
 287
 288 out:
 289     if (iTask->co) {
 290         iTask->bh = aio_bh_new(iTask->iscsilun->aio_context,
 291                                iscsi_co_generic_bh_cb, iTask);
 292         qemu_bh_schedule(iTask->bh);
 293     } else {
 294         iTask->complete = 1;
 295     }
 296 }
 297
 298 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
 299 {
 300     *iTask = (struct IscsiTask) {
 301         .co         = qemu_coroutine_self(),
 302         .iscsilun   = iscsilun,
 303     };
 304 }
 305
 306 static void
 307 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
 308                     void *private_data)
 309 {
 310     IscsiAIOCB *acb = private_data;
 311
 312     acb->status = -ECANCELED;
 313     iscsi_schedule_bh(acb);
 314 }
 315
 316 static void
 317 iscsi_aio_cancel(BlockAIOCB *blockacb)
 318 {
 319     IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
 320     IscsiLun *iscsilun = acb->iscsilun;
 321
 322     if (acb->status != -EINPROGRESS) {
 323         return;
 324     }
 325
 326     /* send a task mgmt call to the target to cancel the task on the target */
 327     iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
 328                                      iscsi_abort_task_cb, acb);
 329
 330 }
 331
 332 static const AIOCBInfo iscsi_aiocb_info = {
 333     .aiocb_size         = sizeof(IscsiAIOCB),
 334     .cancel_async       = iscsi_aio_cancel,
 335 };
 336
 337
 338 static void iscsi_process_read(void *arg);
 339 static void iscsi_process_write(void *arg);
 340
 341 static void
 342 iscsi_set_events(IscsiLun *iscsilun)
 343 {
 344     struct iscsi_context *iscsi = iscsilun->iscsi;
 345     int ev = iscsi_which_events(iscsi);
 346
 347     if (ev != iscsilun->events) {
 348         aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
 349                            false,
 350                            (ev & POLLIN) ? iscsi_process_read : NULL,
 351                            (ev & POLLOUT) ? iscsi_process_write : NULL,
 352                            iscsilun);
 353         iscsilun->events = ev;
 354     }
 355 }
 356
 357 static void iscsi_timed_check_events(void *opaque)
 358 {
 359     IscsiLun *iscsilun = opaque;
 360
 361     /* check for timed out requests */
 362     iscsi_service(iscsilun->iscsi, 0);
 363
 364     if (iscsilun->request_timed_out) {
 365         iscsilun->request_timed_out = false;
 366         iscsi_reconnect(iscsilun->iscsi);
 367     }
 368
 369     /* newer versions of libiscsi may return zero events. Ensure we are able
 370      * to return to service once this situation changes. */
 371     iscsi_set_events(iscsilun);
 372
 373     timer_mod(iscsilun->event_timer,
 374               qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
 375 }
 376
 377 static void
 378 iscsi_process_read(void *arg)
 379 {
 380     IscsiLun *iscsilun = arg;
 381     struct iscsi_context *iscsi = iscsilun->iscsi;
 382
 383     iscsi_service(iscsi, POLLIN);
 384     iscsi_set_events(iscsilun);
 385 }
 386
 387 static void
 388 iscsi_process_write(void *arg)
 389 {
 390     IscsiLun *iscsilun = arg;
 391     struct iscsi_context *iscsi = iscsilun->iscsi;
 392
 393     iscsi_service(iscsi, POLLOUT);
 394     iscsi_set_events(iscsilun);
 395 }
 396
 397 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
 398 {
 399     return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
 400 }
 401
 402 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
 403 {
 404     return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
 405 }
 406
 407 static bool is_request_lun_aligned(int64_t sector_num, int nb_sectors,
 408                                       IscsiLun *iscsilun)
 409 {
 410     if ((sector_num * BDRV_SECTOR_SIZE) % iscsilun->block_size ||
 411         (nb_sectors * BDRV_SECTOR_SIZE) % iscsilun->block_size) {
 412             error_report("iSCSI misaligned request: "
 413                          "iscsilun->block_size %u, sector_num %" PRIi64
 414                          ", nb_sectors %d",
 415                          iscsilun->block_size, sector_num, nb_sectors);
 416             return 0;
 417     }
 418     return 1;
 419 }
 420
 421 static unsigned long *iscsi_allocationmap_init(IscsiLun *iscsilun)
 422 {
 423     return bitmap_try_new(DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks,
 424                                                        iscsilun),
 425                                        iscsilun->cluster_sectors));
 426 }
 427
 428 static void iscsi_allocationmap_set(IscsiLun *iscsilun, int64_t sector_num,
 429                                     int nb_sectors)
 430 {
 431     if (iscsilun->allocationmap == NULL) {
 432         return;
 433     }
 434     bitmap_set(iscsilun->allocationmap,
 435                sector_num / iscsilun->cluster_sectors,
 436                DIV_ROUND_UP(nb_sectors, iscsilun->cluster_sectors));
 437 }
 438
 439 static void iscsi_allocationmap_clear(IscsiLun *iscsilun, int64_t sector_num,
 440                                       int nb_sectors)
 441 {
 442     int64_t cluster_num, nb_clusters;
 443     if (iscsilun->allocationmap == NULL) {
 444         return;
 445     }
 446     cluster_num = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors);
 447     nb_clusters = (sector_num + nb_sectors) / iscsilun->cluster_sectors
 448                   - cluster_num;
 449     if (nb_clusters > 0) {
 450         bitmap_clear(iscsilun->allocationmap, cluster_num, nb_clusters);
 451     }
 452 }
 453
 454 static int coroutine_fn iscsi_co_writev(BlockDriverState *bs,
 455                                         int64_t sector_num, int nb_sectors,
 456                                         QEMUIOVector *iov)
 457 {
 458     IscsiLun *iscsilun = bs->opaque;
 459     struct IscsiTask iTask;
 460     uint64_t lba;
 461     uint32_t num_sectors;
 462     int fua;
 463
 464     if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
 465         return -EINVAL;
 466     }
 467
 468     if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
 469         error_report("iSCSI Error: Write of %d sectors exceeds max_xfer_len "
 470                      "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
 471         return -EINVAL;
 472     }
 473
 474     lba = sector_qemu2lun(sector_num, iscsilun);
 475     num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
 476     iscsi_co_init_iscsitask(iscsilun, &iTask);
 477 retry:
 478     fua = iscsilun->dpofua && !bs->enable_write_cache;
 479     iTask.force_next_flush = !fua;
 480     if (iscsilun->use_16_for_rw) {
 481         iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
 482                                         NULL, num_sectors * iscsilun->block_size,
 483                                         iscsilun->block_size, 0, 0, fua, 0, 0,
 484                                         iscsi_co_generic_cb, &iTask);
 485     } else {
 486         iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
 487                                         NULL, num_sectors * iscsilun->block_size,
 488                                         iscsilun->block_size, 0, 0, fua, 0, 0,
 489                                         iscsi_co_generic_cb, &iTask);
 490     }
 491     if (iTask.task == NULL) {
 492         return -ENOMEM;
 493     }
 494     scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
 495                           iov->niov);
 496     while (!iTask.complete) {
 497         iscsi_set_events(iscsilun);
 498         qemu_coroutine_yield();
 499     }
 500
 501     if (iTask.task != NULL) {
 502         scsi_free_scsi_task(iTask.task);
 503         iTask.task = NULL;
 504     }
 505
 506     if (iTask.do_retry) {
 507         iTask.complete = 0;
 508         goto retry;
 509     }
 510
 511     if (iTask.status != SCSI_STATUS_GOOD) {
 512         return iTask.err_code;
 513     }
 514
 515     iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors);
 516
 517     return 0;
 518 }
 519
 520
 521 static bool iscsi_allocationmap_is_allocated(IscsiLun *iscsilun,
 522                                              int64_t sector_num, int nb_sectors)
 523 {
 524     unsigned long size;
 525     if (iscsilun->allocationmap == NULL) {
 526         return true;
 527     }
 528     size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
 529     return !(find_next_bit(iscsilun->allocationmap, size,
 530                            sector_num / iscsilun->cluster_sectors) == size);
 531 }
 532
 533 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
 534                                                   int64_t sector_num,
 535                                                   int nb_sectors, int *pnum,
 536                                                   BlockDriverState **file)
 537 {
 538     IscsiLun *iscsilun = bs->opaque;
 539     struct scsi_get_lba_status *lbas = NULL;
 540     struct scsi_lba_status_descriptor *lbasd = NULL;
 541     struct IscsiTask iTask;
 542     int64_t ret;
 543
 544     iscsi_co_init_iscsitask(iscsilun, &iTask);
 545
 546     if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
 547         ret = -EINVAL;
 548         goto out;
 549     }
 550
 551     /* default to all sectors allocated */
 552     ret = BDRV_BLOCK_DATA;
 553     ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID;
 554     *pnum = nb_sectors;
 555
 556     /* LUN does not support logical block provisioning */
 557     if (!iscsilun->lbpme) {
 558         goto out;
 559     }
 560
 561 retry:
 562     if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
 563                                   sector_qemu2lun(sector_num, iscsilun),
 564                                   8 + 16, iscsi_co_generic_cb,
 565                                   &iTask) == NULL) {
 566         ret = -ENOMEM;
 567         goto out;
 568     }
 569
 570     while (!iTask.complete) {
 571         iscsi_set_events(iscsilun);
 572         qemu_coroutine_yield();
 573     }
 574
 575     if (iTask.do_retry) {
 576         if (iTask.task != NULL) {
 577             scsi_free_scsi_task(iTask.task);
 578             iTask.task = NULL;
 579         }
 580         iTask.complete = 0;
 581         goto retry;
 582     }
 583
 584     if (iTask.status != SCSI_STATUS_GOOD) {
 585         /* in case the get_lba_status_callout fails (i.e.
 586          * because the device is busy or the cmd is not
 587          * supported) we pretend all blocks are allocated
 588          * for backwards compatibility */
 589         goto out;
 590     }
 591
 592     lbas = scsi_datain_unmarshall(iTask.task);
 593     if (lbas == NULL) {
 594         ret = -EIO;
 595         goto out;
 596     }
 597
 598     lbasd = &lbas->descriptors[0];
 599
 600     if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) {
 601         ret = -EIO;
 602         goto out;
 603     }
 604
 605     *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun);
 606
 607     if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
 608         lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
 609         ret &= ~BDRV_BLOCK_DATA;
 610         if (iscsilun->lbprz) {
 611             ret |= BDRV_BLOCK_ZERO;
 612         }
 613     }
 614
 615     if (ret & BDRV_BLOCK_ZERO) {
 616         iscsi_allocationmap_clear(iscsilun, sector_num, *pnum);
 617     } else {
 618         iscsi_allocationmap_set(iscsilun, sector_num, *pnum);
 619     }
 620
 621     if (*pnum > nb_sectors) {
 622         *pnum = nb_sectors;
 623     }
 624 out:
 625     if (iTask.task != NULL) {
 626         scsi_free_scsi_task(iTask.task);
 627     }
 628     if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) {
 629         *file = bs;
 630     }
 631     return ret;
 632 }
 633
 634 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
 635                                        int64_t sector_num, int nb_sectors,
 636                                        QEMUIOVector *iov)
 637 {
 638     IscsiLun *iscsilun = bs->opaque;
 639     struct IscsiTask iTask;
 640     uint64_t lba;
 641     uint32_t num_sectors;
 642
 643     if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
 644         return -EINVAL;
 645     }
 646
 647     if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
 648         error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len "
 649                      "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
 650         return -EINVAL;
 651     }
 652
 653     if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES &&
 654         !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
 655         int64_t ret;
 656         int pnum;
 657         BlockDriverState *file;
 658         ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum, &file);
 659         if (ret < 0) {
 660             return ret;
 661         }
 662         if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) {
 663             qemu_iovec_memset(iov, 0, 0x00, iov->size);
 664             return 0;
 665         }
 666     }
 667
 668     lba = sector_qemu2lun(sector_num, iscsilun);
 669     num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
 670
 671     iscsi_co_init_iscsitask(iscsilun, &iTask);
 672 retry:
 673     if (iscsilun->use_16_for_rw) {
 674         iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
 675                                        num_sectors * iscsilun->block_size,
 676                                        iscsilun->block_size, 0, 0, 0, 0, 0,
 677                                        iscsi_co_generic_cb, &iTask);
 678     } else {
 679         iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
 680                                        num_sectors * iscsilun->block_size,
 681                                        iscsilun->block_size,
 682                                        0, 0, 0, 0, 0,
 683                                        iscsi_co_generic_cb, &iTask);
 684     }
 685     if (iTask.task == NULL) {
 686         return -ENOMEM;
 687     }
 688     scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
 689
 690     while (!iTask.complete) {
 691         iscsi_set_events(iscsilun);
 692         qemu_coroutine_yield();
 693     }
 694
 695     if (iTask.task != NULL) {
 696         scsi_free_scsi_task(iTask.task);
 697         iTask.task = NULL;
 698     }
 699
 700     if (iTask.do_retry) {
 701         iTask.complete = 0;
 702         goto retry;
 703     }
 704
 705     if (iTask.status != SCSI_STATUS_GOOD) {
 706         return iTask.err_code;
 707     }
 708
 709     return 0;
 710 }
 711
 712 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
 713 {
 714     IscsiLun *iscsilun = bs->opaque;
 715     struct IscsiTask iTask;
 716
 717     if (!iscsilun->force_next_flush) {
 718         return 0;
 719     }
 720     iscsilun->force_next_flush = false;
 721
 722     iscsi_co_init_iscsitask(iscsilun, &iTask);
 723 retry:
 724     if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
 725                                       0, iscsi_co_generic_cb, &iTask) == NULL) {
 726         return -ENOMEM;
 727     }
 728
 729     while (!iTask.complete) {
 730         iscsi_set_events(iscsilun);
 731         qemu_coroutine_yield();
 732     }
 733
 734     if (iTask.task != NULL) {
 735         scsi_free_scsi_task(iTask.task);
 736         iTask.task = NULL;
 737     }
 738
 739     if (iTask.do_retry) {
 740         iTask.complete = 0;
 741         goto retry;
 742     }
 743
 744     if (iTask.status != SCSI_STATUS_GOOD) {
 745         return iTask.err_code;
 746     }
 747
 748     return 0;
 749 }
 750
 751 #ifdef __linux__
 752 static void
 753 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
 754                      void *command_data, void *opaque)
 755 {
 756     IscsiAIOCB *acb = opaque;
 757
 758     g_free(acb->buf);
 759     acb->buf = NULL;
 760
 761     acb->status = 0;
 762     if (status < 0) {
 763         error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
 764                      iscsi_get_error(iscsi));
 765         acb->status = iscsi_translate_sense(&acb->task->sense);
 766     }
 767
 768     acb->ioh->driver_status = 0;
 769     acb->ioh->host_status   = 0;
 770     acb->ioh->resid         = 0;
 771
 772 #define SG_ERR_DRIVER_SENSE    0x08
 773
 774     if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
 775         int ss;
 776
 777         acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
 778
 779         acb->ioh->sb_len_wr = acb->task->datain.size - 2;
 780         ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
 781              acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
 782         memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
 783     }
 784
 785     iscsi_schedule_bh(acb);
 786 }
 787
 788 static void iscsi_ioctl_bh_completion(void *opaque)
 789 {
 790     IscsiAIOCB *acb = opaque;
 791
 792     qemu_bh_delete(acb->bh);
 793     acb->common.cb(acb->common.opaque, acb->ret);
 794     qemu_aio_unref(acb);
 795 }
 796
 797 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
 798 {
 799     BlockDriverState *bs = acb->common.bs;
 800     IscsiLun *iscsilun = bs->opaque;
 801     int ret = 0;
 802
 803     switch (req) {
 804     case SG_GET_VERSION_NUM:
 805         *(int *)buf = 30000;
 806         break;
 807     case SG_GET_SCSI_ID:
 808         ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
 809         break;
 810     default:
 811         ret = -EINVAL;
 812     }
 813     assert(!acb->bh);
 814     acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
 815                          iscsi_ioctl_bh_completion, acb);
 816     acb->ret = ret;
 817     qemu_bh_schedule(acb->bh);
 818 }
 819
 820 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
 821         unsigned long int req, void *buf,
 822         BlockCompletionFunc *cb, void *opaque)
 823 {
 824     IscsiLun *iscsilun = bs->opaque;
 825     struct iscsi_context *iscsi = iscsilun->iscsi;
 826     struct iscsi_data data;
 827     IscsiAIOCB *acb;
 828
 829     acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
 830
 831     acb->iscsilun = iscsilun;
 832     acb->bh          = NULL;
 833     acb->status      = -EINPROGRESS;
 834     acb->buf         = NULL;
 835     acb->ioh         = buf;
 836
 837     if (req != SG_IO) {
 838         iscsi_ioctl_handle_emulated(acb, req, buf);
 839         return &acb->common;
 840     }
 841
 842     acb->task = malloc(sizeof(struct scsi_task));
 843     if (acb->task == NULL) {
 844         error_report("iSCSI: Failed to allocate task for scsi command. %s",
 845                      iscsi_get_error(iscsi));
 846         qemu_aio_unref(acb);
 847         return NULL;
 848     }
 849     memset(acb->task, 0, sizeof(struct scsi_task));
 850
 851     switch (acb->ioh->dxfer_direction) {
 852     case SG_DXFER_TO_DEV:
 853         acb->task->xfer_dir = SCSI_XFER_WRITE;
 854         break;
 855     case SG_DXFER_FROM_DEV:
 856         acb->task->xfer_dir = SCSI_XFER_READ;
 857         break;
 858     default:
 859         acb->task->xfer_dir = SCSI_XFER_NONE;
 860         break;
 861     }
 862
 863     acb->task->cdb_size = acb->ioh->cmd_len;
 864     memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
 865     acb->task->expxferlen = acb->ioh->dxfer_len;
 866
 867     data.size = 0;
 868     if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
 869         if (acb->ioh->iovec_count == 0) {
 870             data.data = acb->ioh->dxferp;
 871             data.size = acb->ioh->dxfer_len;
 872         } else {
 873             scsi_task_set_iov_out(acb->task,
 874                                  (struct scsi_iovec *) acb->ioh->dxferp,
 875                                  acb->ioh->iovec_count);
 876         }
 877     }
 878
 879     if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
 880                                  iscsi_aio_ioctl_cb,
 881                                  (data.size > 0) ? &data : NULL,
 882                                  acb) != 0) {
 883         scsi_free_scsi_task(acb->task);
 884         qemu_aio_unref(acb);
 885         return NULL;
 886     }
 887
 888     /* tell libiscsi to read straight into the buffer we got from ioctl */
 889     if (acb->task->xfer_dir == SCSI_XFER_READ) {
 890         if (acb->ioh->iovec_count == 0) {
 891             scsi_task_add_data_in_buffer(acb->task,
 892                                          acb->ioh->dxfer_len,
 893                                          acb->ioh->dxferp);
 894         } else {
 895             scsi_task_set_iov_in(acb->task,
 896                                  (struct scsi_iovec *) acb->ioh->dxferp,
 897                                  acb->ioh->iovec_count);
 898         }
 899     }
 900
 901     iscsi_set_events(iscsilun);
 902
 903     return &acb->common;
 904 }
 905
 906 #endif
 907
 908 static int64_t
 909 iscsi_getlength(BlockDriverState *bs)
 910 {
 911     IscsiLun *iscsilun = bs->opaque;
 912     int64_t len;
 913
 914     len  = iscsilun->num_blocks;
 915     len *= iscsilun->block_size;
 916
 917     return len;
 918 }
 919
 920 static int
 921 coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num,
 922                                    int nb_sectors)
 923 {
 924     IscsiLun *iscsilun = bs->opaque;
 925     struct IscsiTask iTask;
 926     struct unmap_list list;
 927
 928     if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
 929         return -EINVAL;
 930     }
 931
 932     if (!iscsilun->lbp.lbpu) {
 933         /* UNMAP is not supported by the target */
 934         return 0;
 935     }
 936
 937     list.lba = sector_qemu2lun(sector_num, iscsilun);
 938     list.num = sector_qemu2lun(nb_sectors, iscsilun);
 939
 940     iscsi_co_init_iscsitask(iscsilun, &iTask);
 941 retry:
 942     if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
 943                      iscsi_co_generic_cb, &iTask) == NULL) {
 944         return -ENOMEM;
 945     }
 946
 947     while (!iTask.complete) {
 948         iscsi_set_events(iscsilun);
 949         qemu_coroutine_yield();
 950     }
 951
 952     if (iTask.task != NULL) {
 953         scsi_free_scsi_task(iTask.task);
 954         iTask.task = NULL;
 955     }
 956
 957     if (iTask.do_retry) {
 958         iTask.complete = 0;
 959         goto retry;
 960     }
 961
 962     if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
 963         /* the target might fail with a check condition if it
 964            is not happy with the alignment of the UNMAP request
 965            we silently fail in this case */
 966         return 0;
 967     }
 968
 969     if (iTask.status != SCSI_STATUS_GOOD) {
 970         return iTask.err_code;
 971     }
 972
 973     iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors);
 974
 975     return 0;
 976 }
 977
 978 static int
 979 coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 980                                    int nb_sectors, BdrvRequestFlags flags)
 981 {
 982     IscsiLun *iscsilun = bs->opaque;
 983     struct IscsiTask iTask;
 984     uint64_t lba;
 985     uint32_t nb_blocks;
 986     bool use_16_for_ws = iscsilun->use_16_for_rw;
 987
 988     if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
 989         return -EINVAL;
 990     }
 991
 992     if (flags & BDRV_REQ_MAY_UNMAP) {
 993         if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
 994             /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
 995             use_16_for_ws = true;
 996         }
 997         if (use_16_for_ws && !iscsilun->lbp.lbpws) {
 998             /* WRITESAME16 with UNMAP is not supported by the target,
 999              * fall back and try WRITESAME10/16 without UNMAP */
1000             flags &= ~BDRV_REQ_MAY_UNMAP;
1001             use_16_for_ws = iscsilun->use_16_for_rw;
1002         }
1003     }
1004
1005     if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1006         /* WRITESAME without UNMAP is not supported by the target */
1007         return -ENOTSUP;
1008     }
1009
1010     lba = sector_qemu2lun(sector_num, iscsilun);
1011     nb_blocks = sector_qemu2lun(nb_sectors, iscsilun);
1012
1013     if (iscsilun->zeroblock == NULL) {
1014         iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1015         if (iscsilun->zeroblock == NULL) {
1016             return -ENOMEM;
1017         }
1018     }
1019
1020     iscsi_co_init_iscsitask(iscsilun, &iTask);
1021     iTask.force_next_flush = true;
1022 retry:
1023     if (use_16_for_ws) {
1024         iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1025                                             iscsilun->zeroblock, iscsilun->block_size,
1026                                             nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1027                                             0, 0, iscsi_co_generic_cb, &iTask);
1028     } else {
1029         iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1030                                             iscsilun->zeroblock, iscsilun->block_size,
1031                                             nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1032                                             0, 0, iscsi_co_generic_cb, &iTask);
1033     }
1034     if (iTask.task == NULL) {
1035         return -ENOMEM;
1036     }
1037
1038     while (!iTask.complete) {
1039         iscsi_set_events(iscsilun);
1040         qemu_coroutine_yield();
1041     }
1042
1043     if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1044         iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1045         (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1046          iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1047         /* WRITE SAME is not supported by the target */
1048         iscsilun->has_write_same = false;
1049         scsi_free_scsi_task(iTask.task);
1050         return -ENOTSUP;
1051     }
1052
1053     if (iTask.task != NULL) {
1054         scsi_free_scsi_task(iTask.task);
1055         iTask.task = NULL;
1056     }
1057
1058     if (iTask.do_retry) {
1059         iTask.complete = 0;
1060         goto retry;
1061     }
1062
1063     if (iTask.status != SCSI_STATUS_GOOD) {
1064         return iTask.err_code;
1065     }
1066
1067     if (flags & BDRV_REQ_MAY_UNMAP) {
1068         iscsi_allocationmap_clear(iscsilun, sector_num, nb_sectors);
1069     } else {
1070         iscsi_allocationmap_set(iscsilun, sector_num, nb_sectors);
1071     }
1072
1073     return 0;
1074 }
1075
1076 static void parse_chap(struct iscsi_context *iscsi, const char *target,
1077                        Error **errp)
1078 {
1079     QemuOptsList *list;
1080     QemuOpts *opts;
1081     const char *user = NULL;
1082     const char *password = NULL;
1083
1084     list = qemu_find_opts("iscsi");
1085     if (!list) {
1086         return;
1087     }
1088
1089     opts = qemu_opts_find(list, target);
1090     if (opts == NULL) {
1091         opts = QTAILQ_FIRST(&list->head);
1092         if (!opts) {
1093             return;
1094         }
1095     }
1096
1097     user = qemu_opt_get(opts, "user");
1098     if (!user) {
1099         return;
1100     }
1101
1102     password = qemu_opt_get(opts, "password");
1103     if (!password) {
1104         error_setg(errp, "CHAP username specified but no password was given");
1105         return;
1106     }
1107
1108     if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1109         error_setg(errp, "Failed to set initiator username and password");
1110     }
1111 }
1112
1113 static void parse_header_digest(struct iscsi_context *iscsi, const char *target,
1114                                 Error **errp)
1115 {
1116     QemuOptsList *list;
1117     QemuOpts *opts;
1118     const char *digest = NULL;
1119
1120     list = qemu_find_opts("iscsi");
1121     if (!list) {
1122         return;
1123     }
1124
1125     opts = qemu_opts_find(list, target);
1126     if (opts == NULL) {
1127         opts = QTAILQ_FIRST(&list->head);
1128         if (!opts) {
1129             return;
1130         }
1131     }
1132
1133     digest = qemu_opt_get(opts, "header-digest");
1134     if (!digest) {
1135         return;
1136     }
1137
1138     if (!strcmp(digest, "CRC32C")) {
1139         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1140     } else if (!strcmp(digest, "NONE")) {
1141         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1142     } else if (!strcmp(digest, "CRC32C-NONE")) {
1143         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1144     } else if (!strcmp(digest, "NONE-CRC32C")) {
1145         iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1146     } else {
1147         error_setg(errp, "Invalid header-digest setting : %s", digest);
1148     }
1149 }
1150
1151 static char *parse_initiator_name(const char *target)
1152 {
1153     QemuOptsList *list;
1154     QemuOpts *opts;
1155     const char *name;
1156     char *iscsi_name;
1157     UuidInfo *uuid_info;
1158
1159     list = qemu_find_opts("iscsi");
1160     if (list) {
1161         opts = qemu_opts_find(list, target);
1162         if (!opts) {
1163             opts = QTAILQ_FIRST(&list->head);
1164         }
1165         if (opts) {
1166             name = qemu_opt_get(opts, "initiator-name");
1167             if (name) {
1168                 return g_strdup(name);
1169             }
1170         }
1171     }
1172
1173     uuid_info = qmp_query_uuid(NULL);
1174     if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1175         name = qemu_get_vm_name();
1176     } else {
1177         name = uuid_info->UUID;
1178     }
1179     iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1180                                  name ? ":" : "", name ? name : "");
1181     qapi_free_UuidInfo(uuid_info);
1182     return iscsi_name;
1183 }
1184
1185 static int parse_timeout(const char *target)
1186 {
1187     QemuOptsList *list;
1188     QemuOpts *opts;
1189     const char *timeout;
1190
1191     list = qemu_find_opts("iscsi");
1192     if (list) {
1193         opts = qemu_opts_find(list, target);
1194         if (!opts) {
1195             opts = QTAILQ_FIRST(&list->head);
1196         }
1197         if (opts) {
1198             timeout = qemu_opt_get(opts, "timeout");
1199             if (timeout) {
1200                 return atoi(timeout);
1201             }
1202         }
1203     }
1204
1205     return 0;
1206 }
1207
1208 static void iscsi_nop_timed_event(void *opaque)
1209 {
1210     IscsiLun *iscsilun = opaque;
1211
1212     if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1213         error_report("iSCSI: NOP timeout. Reconnecting...");
1214         iscsilun->request_timed_out = true;
1215     } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1216         error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1217         return;
1218     }
1219
1220     timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1221     iscsi_set_events(iscsilun);
1222 }
1223
1224 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1225 {
1226     struct scsi_task *task = NULL;
1227     struct scsi_readcapacity10 *rc10 = NULL;
1228     struct scsi_readcapacity16 *rc16 = NULL;
1229     int retries = ISCSI_CMD_RETRIES;
1230
1231     do {
1232         if (task != NULL) {
1233             scsi_free_scsi_task(task);
1234             task = NULL;
1235         }
1236
1237         switch (iscsilun->type) {
1238         case TYPE_DISK:
1239             task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1240             if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1241                 rc16 = scsi_datain_unmarshall(task);
1242                 if (rc16 == NULL) {
1243                     error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1244                 } else {
1245                     iscsilun->block_size = rc16->block_length;
1246                     iscsilun->num_blocks = rc16->returned_lba + 1;
1247                     iscsilun->lbpme = !!rc16->lbpme;
1248                     iscsilun->lbprz = !!rc16->lbprz;
1249                     iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1250                 }
1251                 break;
1252             }
1253             if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1254                 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1255                 break;
1256             }
1257             /* Fall through and try READ CAPACITY(10) instead.  */
1258         case TYPE_ROM:
1259             task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1260             if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1261                 rc10 = scsi_datain_unmarshall(task);
1262                 if (rc10 == NULL) {
1263                     error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1264                 } else {
1265                     iscsilun->block_size = rc10->block_size;
1266                     if (rc10->lba == 0) {
1267                         /* blank disk loaded */
1268                         iscsilun->num_blocks = 0;
1269                     } else {
1270                         iscsilun->num_blocks = rc10->lba + 1;
1271                     }
1272                 }
1273             }
1274             break;
1275         default:
1276             return;
1277         }
1278     } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1279              && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1280              && retries-- > 0);
1281
1282     if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1283         error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1284     } else if (!iscsilun->block_size ||
1285                iscsilun->block_size % BDRV_SECTOR_SIZE) {
1286         error_setg(errp, "iSCSI: the target returned an invalid "
1287                    "block size of %d.", iscsilun->block_size);
1288     }
1289     if (task) {
1290         scsi_free_scsi_task(task);
1291     }
1292 }
1293
1294 /* TODO Convert to fine grained options */
1295 static QemuOptsList runtime_opts = {
1296     .name = "iscsi",
1297     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1298     .desc = {
1299         {
1300             .name = "filename",
1301             .type = QEMU_OPT_STRING,
1302             .help = "URL to the iscsi image",
1303         },
1304         { /* end of list */ }
1305     },
1306 };
1307
1308 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1309                                           int evpd, int pc, void **inq, Error **errp)
1310 {
1311     int full_size;
1312     struct scsi_task *task = NULL;
1313     task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1314     if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1315         goto fail;
1316     }
1317     full_size = scsi_datain_getfullsize(task);
1318     if (full_size > task->datain.size) {
1319         scsi_free_scsi_task(task);
1320
1321         /* we need more data for the full list */
1322         task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1323         if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1324             goto fail;
1325         }
1326     }
1327
1328     *inq = scsi_datain_unmarshall(task);
1329     if (*inq == NULL) {
1330         error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1331         goto fail_with_err;
1332     }
1333
1334     return task;
1335
1336 fail:
1337     error_setg(errp, "iSCSI: Inquiry command failed : %s",
1338                iscsi_get_error(iscsi));
1339 fail_with_err:
1340     if (task != NULL) {
1341         scsi_free_scsi_task(task);
1342     }
1343     return NULL;
1344 }
1345
1346 static void iscsi_detach_aio_context(BlockDriverState *bs)
1347 {
1348     IscsiLun *iscsilun = bs->opaque;
1349
1350     aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1351                        false, NULL, NULL, NULL);
1352     iscsilun->events = 0;
1353
1354     if (iscsilun->nop_timer) {
1355         timer_del(iscsilun->nop_timer);
1356         timer_free(iscsilun->nop_timer);
1357         iscsilun->nop_timer = NULL;
1358     }
1359     if (iscsilun->event_timer) {
1360         timer_del(iscsilun->event_timer);
1361         timer_free(iscsilun->event_timer);
1362         iscsilun->event_timer = NULL;
1363     }
1364 }
1365
1366 static void iscsi_attach_aio_context(BlockDriverState *bs,
1367                                      AioContext *new_context)
1368 {
1369     IscsiLun *iscsilun = bs->opaque;
1370
1371     iscsilun->aio_context = new_context;
1372     iscsi_set_events(iscsilun);
1373
1374     /* Set up a timer for sending out iSCSI NOPs */
1375     iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1376                                         QEMU_CLOCK_REALTIME, SCALE_MS,
1377                                         iscsi_nop_timed_event, iscsilun);
1378     timer_mod(iscsilun->nop_timer,
1379               qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1380
1381     /* Set up a timer for periodic calls to iscsi_set_events and to
1382      * scan for command timeout */
1383     iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1384                                           QEMU_CLOCK_REALTIME, SCALE_MS,
1385                                           iscsi_timed_check_events, iscsilun);
1386     timer_mod(iscsilun->event_timer,
1387               qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1388 }
1389
1390 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1391 {
1392     struct scsi_task *task;
1393     struct scsi_mode_sense *ms = NULL;
1394     iscsilun->write_protected = false;
1395     iscsilun->dpofua = false;
1396
1397     task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1398                                  1, SCSI_MODESENSE_PC_CURRENT,
1399                                  0x3F, 0, 255);
1400     if (task == NULL) {
1401         error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1402                      iscsi_get_error(iscsilun->iscsi));
1403         goto out;
1404     }
1405
1406     if (task->status != SCSI_STATUS_GOOD) {
1407         error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1408         goto out;
1409     }
1410     ms = scsi_datain_unmarshall(task);
1411     if (!ms) {
1412         error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1413                      iscsi_get_error(iscsilun->iscsi));
1414         goto out;
1415     }
1416     iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1417     iscsilun->dpofua          = ms->device_specific_parameter & 0x10;
1418
1419 out:
1420     if (task) {
1421         scsi_free_scsi_task(task);
1422     }
1423 }
1424
1425 /*
1426  * We support iscsi url's on the form
1427  * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1428  */
1429 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1430                       Error **errp)
1431 {
1432     IscsiLun *iscsilun = bs->opaque;
1433     struct iscsi_context *iscsi = NULL;
1434     struct iscsi_url *iscsi_url = NULL;
1435     struct scsi_task *task = NULL;
1436     struct scsi_inquiry_standard *inq = NULL;
1437     struct scsi_inquiry_supported_pages *inq_vpd;
1438     char *initiator_name = NULL;
1439     QemuOpts *opts;
1440     Error *local_err = NULL;
1441     const char *filename;
1442     int i, ret = 0, timeout = 0;
1443
1444     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1445     qemu_opts_absorb_qdict(opts, options, &local_err);
1446     if (local_err) {
1447         error_propagate(errp, local_err);
1448         ret = -EINVAL;
1449         goto out;
1450     }
1451
1452     filename = qemu_opt_get(opts, "filename");
1453
1454     iscsi_url = iscsi_parse_full_url(iscsi, filename);
1455     if (iscsi_url == NULL) {
1456         error_setg(errp, "Failed to parse URL : %s", filename);
1457         ret = -EINVAL;
1458         goto out;
1459     }
1460
1461     memset(iscsilun, 0, sizeof(IscsiLun));
1462
1463     initiator_name = parse_initiator_name(iscsi_url->target);
1464
1465     iscsi = iscsi_create_context(initiator_name);
1466     if (iscsi == NULL) {
1467         error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1468         ret = -ENOMEM;
1469         goto out;
1470     }
1471
1472     if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
1473         error_setg(errp, "iSCSI: Failed to set target name.");
1474         ret = -EINVAL;
1475         goto out;
1476     }
1477
1478     if (iscsi_url->user[0] != '\0') {
1479         ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user,
1480                                               iscsi_url->passwd);
1481         if (ret != 0) {
1482             error_setg(errp, "Failed to set initiator username and password");
1483             ret = -EINVAL;
1484             goto out;
1485         }
1486     }
1487
1488     /* check if we got CHAP username/password via the options */
1489     parse_chap(iscsi, iscsi_url->target, &local_err);
1490     if (local_err != NULL) {
1491         error_propagate(errp, local_err);
1492         ret = -EINVAL;
1493         goto out;
1494     }
1495
1496     if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1497         error_setg(errp, "iSCSI: Failed to set session type to normal.");
1498         ret = -EINVAL;
1499         goto out;
1500     }
1501
1502     iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1503
1504     /* check if we got HEADER_DIGEST via the options */
1505     parse_header_digest(iscsi, iscsi_url->target, &local_err);
1506     if (local_err != NULL) {
1507         error_propagate(errp, local_err);
1508         ret = -EINVAL;
1509         goto out;
1510     }
1511
1512     /* timeout handling is broken in libiscsi before 1.15.0 */
1513     timeout = parse_timeout(iscsi_url->target);
1514 #if defined(LIBISCSI_API_VERSION) && LIBISCSI_API_VERSION >= 20150621
1515     iscsi_set_timeout(iscsi, timeout);
1516 #else
1517     if (timeout) {
1518         error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1519     }
1520 #endif
1521
1522     if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
1523         error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1524             iscsi_get_error(iscsi));
1525         ret = -EINVAL;
1526         goto out;
1527     }
1528
1529     iscsilun->iscsi = iscsi;
1530     iscsilun->aio_context = bdrv_get_aio_context(bs);
1531     iscsilun->lun   = iscsi_url->lun;
1532     iscsilun->has_write_same = true;
1533
1534     task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1535                             (void **) &inq, errp);
1536     if (task == NULL) {
1537         ret = -EINVAL;
1538         goto out;
1539     }
1540     iscsilun->type = inq->periperal_device_type;
1541     scsi_free_scsi_task(task);
1542     task = NULL;
1543
1544     iscsi_modesense_sync(iscsilun);
1545
1546     /* Check the write protect flag of the LUN if we want to write */
1547     if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1548         iscsilun->write_protected) {
1549         error_setg(errp, "Cannot open a write protected LUN as read-write");
1550         ret = -EACCES;
1551         goto out;
1552     }
1553
1554     iscsi_readcapacity_sync(iscsilun, &local_err);
1555     if (local_err != NULL) {
1556         error_propagate(errp, local_err);
1557         ret = -EINVAL;
1558         goto out;
1559     }
1560     bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1561     bs->request_alignment = iscsilun->block_size;
1562
1563     /* We don't have any emulation for devices other than disks and CD-ROMs, so
1564      * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1565      * will try to read from the device to guess the image format.
1566      */
1567     if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1568         bs->sg = 1;
1569     }
1570
1571     task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1572                             SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1573                             (void **) &inq_vpd, errp);
1574     if (task == NULL) {
1575         ret = -EINVAL;
1576         goto out;
1577     }
1578     for (i = 0; i < inq_vpd->num_pages; i++) {
1579         struct scsi_task *inq_task;
1580         struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1581         struct scsi_inquiry_block_limits *inq_bl;
1582         switch (inq_vpd->pages[i]) {
1583         case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1584             inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1585                                         SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1586                                         (void **) &inq_lbp, errp);
1587             if (inq_task == NULL) {
1588                 ret = -EINVAL;
1589                 goto out;
1590             }
1591             memcpy(&iscsilun->lbp, inq_lbp,
1592                    sizeof(struct scsi_inquiry_logical_block_provisioning));
1593             scsi_free_scsi_task(inq_task);
1594             break;
1595         case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1596             inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1597                                     SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1598                                     (void **) &inq_bl, errp);
1599             if (inq_task == NULL) {
1600                 ret = -EINVAL;
1601                 goto out;
1602             }
1603             memcpy(&iscsilun->bl, inq_bl,
1604                    sizeof(struct scsi_inquiry_block_limits));
1605             scsi_free_scsi_task(inq_task);
1606             break;
1607         default:
1608             break;
1609         }
1610     }
1611     scsi_free_scsi_task(task);
1612     task = NULL;
1613
1614     iscsi_attach_aio_context(bs, iscsilun->aio_context);
1615
1616     /* Guess the internal cluster (page) size of the iscsi target by the means
1617      * of opt_unmap_gran. Transfer the unmap granularity only if it has a
1618      * reasonable size */
1619     if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
1620         iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
1621         iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran *
1622                                      iscsilun->block_size) >> BDRV_SECTOR_BITS;
1623         if (iscsilun->lbprz) {
1624             iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun);
1625             if (iscsilun->allocationmap == NULL) {
1626                 ret = -ENOMEM;
1627             }
1628         }
1629     }
1630
1631 out:
1632     qemu_opts_del(opts);
1633     g_free(initiator_name);
1634     if (iscsi_url != NULL) {
1635         iscsi_destroy_url(iscsi_url);
1636     }
1637     if (task != NULL) {
1638         scsi_free_scsi_task(task);
1639     }
1640
1641     if (ret) {
1642         if (iscsi != NULL) {
1643             if (iscsi_is_logged_in(iscsi)) {
1644                 iscsi_logout_sync(iscsi);
1645             }
1646             iscsi_destroy_context(iscsi);
1647         }
1648         memset(iscsilun, 0, sizeof(IscsiLun));
1649     }
1650     return ret;
1651 }
1652
1653 static void iscsi_close(BlockDriverState *bs)
1654 {
1655     IscsiLun *iscsilun = bs->opaque;
1656     struct iscsi_context *iscsi = iscsilun->iscsi;
1657
1658     iscsi_detach_aio_context(bs);
1659     if (iscsi_is_logged_in(iscsi)) {
1660         iscsi_logout_sync(iscsi);
1661     }
1662     iscsi_destroy_context(iscsi);
1663     g_free(iscsilun->zeroblock);
1664     g_free(iscsilun->allocationmap);
1665     memset(iscsilun, 0, sizeof(IscsiLun));
1666 }
1667
1668 static int sector_limits_lun2qemu(int64_t sector, IscsiLun *iscsilun)
1669 {
1670     return MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1);
1671 }
1672
1673 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
1674 {
1675     /* We don't actually refresh here, but just return data queried in
1676      * iscsi_open(): iscsi targets don't change their limits. */
1677
1678     IscsiLun *iscsilun = bs->opaque;
1679     uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
1680
1681     if (iscsilun->bl.max_xfer_len) {
1682         max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
1683     }
1684
1685     bs->bl.max_transfer_length = sector_limits_lun2qemu(max_xfer_len, iscsilun);
1686
1687     if (iscsilun->lbp.lbpu) {
1688         if (iscsilun->bl.max_unmap < 0xffffffff) {
1689             bs->bl.max_discard =
1690                 sector_limits_lun2qemu(iscsilun->bl.max_unmap, iscsilun);
1691         }
1692         bs->bl.discard_alignment =
1693             sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun);
1694     }
1695
1696     if (iscsilun->bl.max_ws_len < 0xffffffff) {
1697         bs->bl.max_write_zeroes =
1698             sector_limits_lun2qemu(iscsilun->bl.max_ws_len, iscsilun);
1699     }
1700     if (iscsilun->lbp.lbpws) {
1701         bs->bl.write_zeroes_alignment =
1702             sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun);
1703     }
1704     bs->bl.opt_transfer_length =
1705         sector_limits_lun2qemu(iscsilun->bl.opt_xfer_len, iscsilun);
1706 }
1707
1708 /* Note that this will not re-establish a connection with an iSCSI target - it
1709  * is effectively a NOP.  */
1710 static int iscsi_reopen_prepare(BDRVReopenState *state,
1711                                 BlockReopenQueue *queue, Error **errp)
1712 {
1713     IscsiLun *iscsilun = state->bs->opaque;
1714
1715     if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
1716         error_setg(errp, "Cannot open a write protected LUN as read-write");
1717         return -EACCES;
1718     }
1719     return 0;
1720 }
1721
1722 static int iscsi_truncate(BlockDriverState *bs, int64_t offset)
1723 {
1724     IscsiLun *iscsilun = bs->opaque;
1725     Error *local_err = NULL;
1726
1727     if (iscsilun->type != TYPE_DISK) {
1728         return -ENOTSUP;
1729     }
1730
1731     iscsi_readcapacity_sync(iscsilun, &local_err);
1732     if (local_err != NULL) {
1733         error_free(local_err);
1734         return -EIO;
1735     }
1736
1737     if (offset > iscsi_getlength(bs)) {
1738         return -EINVAL;
1739     }
1740
1741     if (iscsilun->allocationmap != NULL) {
1742         g_free(iscsilun->allocationmap);
1743         iscsilun->allocationmap = iscsi_allocationmap_init(iscsilun);
1744     }
1745
1746     return 0;
1747 }
1748
1749 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp)
1750 {
1751     int ret = 0;
1752     int64_t total_size = 0;
1753     BlockDriverState *bs;
1754     IscsiLun *iscsilun = NULL;
1755     QDict *bs_options;
1756
1757     bs = bdrv_new();
1758
1759     /* Read out options */
1760     total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1761                               BDRV_SECTOR_SIZE);
1762     bs->opaque = g_new0(struct IscsiLun, 1);
1763     iscsilun = bs->opaque;
1764
1765     bs_options = qdict_new();
1766     qdict_put(bs_options, "filename", qstring_from_str(filename));
1767     ret = iscsi_open(bs, bs_options, 0, NULL);
1768     QDECREF(bs_options);
1769
1770     if (ret != 0) {
1771         goto out;
1772     }
1773     iscsi_detach_aio_context(bs);
1774     if (iscsilun->type != TYPE_DISK) {
1775         ret = -ENODEV;
1776         goto out;
1777     }
1778     if (bs->total_sectors < total_size) {
1779         ret = -ENOSPC;
1780         goto out;
1781     }
1782
1783     ret = 0;
1784 out:
1785     if (iscsilun->iscsi != NULL) {
1786         iscsi_destroy_context(iscsilun->iscsi);
1787     }
1788     g_free(bs->opaque);
1789     bs->opaque = NULL;
1790     bdrv_unref(bs);
1791     return ret;
1792 }
1793
1794 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1795 {
1796     IscsiLun *iscsilun = bs->opaque;
1797     bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
1798     bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
1799     bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE;
1800     return 0;
1801 }
1802
1803 static QemuOptsList iscsi_create_opts = {
1804     .name = "iscsi-create-opts",
1805     .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
1806     .desc = {
1807         {
1808             .name = BLOCK_OPT_SIZE,
1809             .type = QEMU_OPT_SIZE,
1810             .help = "Virtual disk size"
1811         },
1812         { /* end of list */ }
1813     }
1814 };
1815
1816 static BlockDriver bdrv_iscsi = {
1817     .format_name     = "iscsi",
1818     .protocol_name   = "iscsi",
1819
1820     .instance_size   = sizeof(IscsiLun),
1821     .bdrv_needs_filename = true,
1822     .bdrv_file_open  = iscsi_open,
1823     .bdrv_close      = iscsi_close,
1824     .bdrv_create     = iscsi_create,
1825     .create_opts     = &iscsi_create_opts,
1826     .bdrv_reopen_prepare  = iscsi_reopen_prepare,
1827
1828     .bdrv_getlength  = iscsi_getlength,
1829     .bdrv_get_info   = iscsi_get_info,
1830     .bdrv_truncate   = iscsi_truncate,
1831     .bdrv_refresh_limits = iscsi_refresh_limits,
1832
1833     .bdrv_co_get_block_status = iscsi_co_get_block_status,
1834     .bdrv_co_discard      = iscsi_co_discard,
1835     .bdrv_co_write_zeroes = iscsi_co_write_zeroes,
1836     .bdrv_co_readv         = iscsi_co_readv,
1837     .bdrv_co_writev        = iscsi_co_writev,
1838     .bdrv_co_flush_to_disk = iscsi_co_flush,
1839
1840 #ifdef __linux__
1841     .bdrv_aio_ioctl   = iscsi_aio_ioctl,
1842 #endif
1843
1844     .bdrv_detach_aio_context = iscsi_detach_aio_context,
1845     .bdrv_attach_aio_context = iscsi_attach_aio_context,
1846 };
1847
1848 static QemuOptsList qemu_iscsi_opts = {
1849     .name = "iscsi",
1850     .head = QTAILQ_HEAD_INITIALIZER(qemu_iscsi_opts.head),
1851     .desc = {
1852         {
1853             .name = "user",
1854             .type = QEMU_OPT_STRING,
1855             .help = "username for CHAP authentication to target",
1856         },{
1857             .name = "password",
1858             .type = QEMU_OPT_STRING,
1859             .help = "password for CHAP authentication to target",
1860         },{
1861             .name = "header-digest",
1862             .type = QEMU_OPT_STRING,
1863             .help = "HeaderDigest setting. "
1864                     "{CRC32C|CRC32C-NONE|NONE-CRC32C|NONE}",
1865         },{
1866             .name = "initiator-name",
1867             .type = QEMU_OPT_STRING,
1868             .help = "Initiator iqn name to use when connecting",
1869         },{
1870             .name = "timeout",
1871             .type = QEMU_OPT_NUMBER,
1872             .help = "Request timeout in seconds (default 0 = no timeout)",
1873         },
1874         { /* end of list */ }
1875     },
1876 };
1877
1878 static void iscsi_block_init(void)
1879 {
1880     bdrv_register(&bdrv_iscsi);
1881     qemu_add_opts(&qemu_iscsi_opts);
1882 }
1883
1884 block_init(iscsi_block_init);