2 * QEMU Block driver for iSCSI images
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #include "config-host.h"
28 #include <arpa/inet.h>
29 #include "qemu-common.h"
30 #include "qemu-error.h"
31 #include "block_int.h"
33 #include "hw/scsi-defs.h"
35 #include <iscsi/iscsi.h>
36 #include <iscsi/scsi-lowlevel.h>
40 #include <hw/scsi-defs.h>
43 typedef struct IscsiLun {
44 struct iscsi_context *iscsi;
46 enum scsi_inquiry_peripheral_device_type type;
52 typedef struct IscsiAIOCB {
53 BlockDriverAIOCB common;
57 struct scsi_task *task;
73 qemu_bh_delete(acb->bh);
75 if (acb->canceled == 0) {
76 acb->common.cb(acb->common.opaque, acb->status);
79 if (acb->task != NULL) {
80 scsi_free_scsi_task(acb->task);
84 qemu_aio_release(acb);
88 iscsi_schedule_bh(IscsiAIOCB *acb)
93 acb->bh = qemu_bh_new(iscsi_bh_cb, acb);
94 qemu_bh_schedule(acb->bh);
99 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
102 IscsiAIOCB *acb = private_data;
104 acb->status = -ECANCELED;
105 iscsi_schedule_bh(acb);
109 iscsi_aio_cancel(BlockDriverAIOCB *blockacb)
111 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
112 IscsiLun *iscsilun = acb->iscsilun;
114 if (acb->status != -EINPROGRESS) {
120 /* send a task mgmt call to the target to cancel the task on the target */
121 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
122 iscsi_abort_task_cb, acb);
124 while (acb->status == -EINPROGRESS) {
129 static const AIOCBInfo iscsi_aiocb_info = {
130 .aiocb_size = sizeof(IscsiAIOCB),
131 .cancel = iscsi_aio_cancel,
135 static void iscsi_process_read(void *arg);
136 static void iscsi_process_write(void *arg);
138 static int iscsi_process_flush(void *arg)
140 IscsiLun *iscsilun = arg;
142 return iscsi_queue_length(iscsilun->iscsi) > 0;
146 iscsi_set_events(IscsiLun *iscsilun)
148 struct iscsi_context *iscsi = iscsilun->iscsi;
151 /* We always register a read handler. */
153 ev |= iscsi_which_events(iscsi);
154 if (ev != iscsilun->events) {
155 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi),
157 (ev & POLLOUT) ? iscsi_process_write : NULL,
163 iscsilun->events = ev;
167 iscsi_process_read(void *arg)
169 IscsiLun *iscsilun = arg;
170 struct iscsi_context *iscsi = iscsilun->iscsi;
172 iscsi_service(iscsi, POLLIN);
173 iscsi_set_events(iscsilun);
177 iscsi_process_write(void *arg)
179 IscsiLun *iscsilun = arg;
180 struct iscsi_context *iscsi = iscsilun->iscsi;
182 iscsi_service(iscsi, POLLOUT);
183 iscsi_set_events(iscsilun);
188 iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status,
189 void *command_data, void *opaque)
191 IscsiAIOCB *acb = opaque;
193 trace_iscsi_aio_write16_cb(iscsi, status, acb, acb->canceled);
197 if (acb->canceled != 0) {
203 error_report("Failed to write16 data to iSCSI lun. %s",
204 iscsi_get_error(iscsi));
208 iscsi_schedule_bh(acb);
211 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
213 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
216 static BlockDriverAIOCB *
217 iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
218 QEMUIOVector *qiov, int nb_sectors,
219 BlockDriverCompletionFunc *cb,
222 IscsiLun *iscsilun = bs->opaque;
223 struct iscsi_context *iscsi = iscsilun->iscsi;
226 uint32_t num_sectors;
228 struct iscsi_data data;
230 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
231 trace_iscsi_aio_writev(iscsi, sector_num, nb_sectors, opaque, acb);
233 acb->iscsilun = iscsilun;
238 acb->status = -EINPROGRESS;
240 /* XXX we should pass the iovec to write16 to avoid the extra copy */
241 /* this will allow us to get rid of 'buf' completely */
242 size = nb_sectors * BDRV_SECTOR_SIZE;
243 acb->buf = g_malloc(size);
244 qemu_iovec_to_buf(acb->qiov, 0, acb->buf, size);
246 acb->task = malloc(sizeof(struct scsi_task));
247 if (acb->task == NULL) {
248 error_report("iSCSI: Failed to allocate task for scsi WRITE16 "
249 "command. %s", iscsi_get_error(iscsi));
250 qemu_aio_release(acb);
253 memset(acb->task, 0, sizeof(struct scsi_task));
255 acb->task->xfer_dir = SCSI_XFER_WRITE;
256 acb->task->cdb_size = 16;
257 acb->task->cdb[0] = 0x8a;
258 lba = sector_qemu2lun(sector_num, iscsilun);
259 *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32);
260 *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff);
261 num_sectors = size / iscsilun->block_size;
262 *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
263 acb->task->expxferlen = size;
265 data.data = acb->buf;
268 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
269 iscsi_aio_write16_cb,
272 scsi_free_scsi_task(acb->task);
274 qemu_aio_release(acb);
278 iscsi_set_events(iscsilun);
284 iscsi_aio_read16_cb(struct iscsi_context *iscsi, int status,
285 void *command_data, void *opaque)
287 IscsiAIOCB *acb = opaque;
289 trace_iscsi_aio_read16_cb(iscsi, status, acb, acb->canceled);
291 if (acb->canceled != 0) {
297 error_report("Failed to read16 data from iSCSI lun. %s",
298 iscsi_get_error(iscsi));
302 iscsi_schedule_bh(acb);
305 static BlockDriverAIOCB *
306 iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
307 QEMUIOVector *qiov, int nb_sectors,
308 BlockDriverCompletionFunc *cb,
311 IscsiLun *iscsilun = bs->opaque;
312 struct iscsi_context *iscsi = iscsilun->iscsi;
314 size_t qemu_read_size;
317 uint32_t num_sectors;
319 qemu_read_size = BDRV_SECTOR_SIZE * (size_t)nb_sectors;
321 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
322 trace_iscsi_aio_readv(iscsi, sector_num, nb_sectors, opaque, acb);
324 acb->iscsilun = iscsilun;
329 acb->status = -EINPROGRESS;
330 acb->read_size = qemu_read_size;
333 /* If LUN blocksize is bigger than BDRV_BLOCK_SIZE a read from QEMU
334 * may be misaligned to the LUN, so we may need to read some extra
337 acb->read_offset = 0;
338 if (iscsilun->block_size > BDRV_SECTOR_SIZE) {
339 uint64_t bdrv_offset = BDRV_SECTOR_SIZE * sector_num;
341 acb->read_offset = bdrv_offset % iscsilun->block_size;
344 num_sectors = (qemu_read_size + iscsilun->block_size
345 + acb->read_offset - 1)
346 / iscsilun->block_size;
348 acb->task = malloc(sizeof(struct scsi_task));
349 if (acb->task == NULL) {
350 error_report("iSCSI: Failed to allocate task for scsi READ16 "
351 "command. %s", iscsi_get_error(iscsi));
352 qemu_aio_release(acb);
355 memset(acb->task, 0, sizeof(struct scsi_task));
357 acb->task->xfer_dir = SCSI_XFER_READ;
358 lba = sector_qemu2lun(sector_num, iscsilun);
359 acb->task->expxferlen = qemu_read_size;
361 switch (iscsilun->type) {
363 acb->task->cdb_size = 16;
364 acb->task->cdb[0] = 0x88;
365 *(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32);
366 *(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff);
367 *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
370 acb->task->cdb_size = 10;
371 acb->task->cdb[0] = 0x28;
372 *(uint32_t *)&acb->task->cdb[2] = htonl(lba);
373 *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
377 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
381 scsi_free_scsi_task(acb->task);
382 qemu_aio_release(acb);
386 for (i = 0; i < acb->qiov->niov; i++) {
387 scsi_task_add_data_in_buffer(acb->task,
388 acb->qiov->iov[i].iov_len,
389 acb->qiov->iov[i].iov_base);
392 iscsi_set_events(iscsilun);
399 iscsi_synccache10_cb(struct iscsi_context *iscsi, int status,
400 void *command_data, void *opaque)
402 IscsiAIOCB *acb = opaque;
404 if (acb->canceled != 0) {
410 error_report("Failed to sync10 data on iSCSI lun. %s",
411 iscsi_get_error(iscsi));
415 iscsi_schedule_bh(acb);
418 static BlockDriverAIOCB *
419 iscsi_aio_flush(BlockDriverState *bs,
420 BlockDriverCompletionFunc *cb, void *opaque)
422 IscsiLun *iscsilun = bs->opaque;
423 struct iscsi_context *iscsi = iscsilun->iscsi;
426 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
428 acb->iscsilun = iscsilun;
431 acb->status = -EINPROGRESS;
433 acb->task = iscsi_synchronizecache10_task(iscsi, iscsilun->lun,
435 iscsi_synccache10_cb,
437 if (acb->task == NULL) {
438 error_report("iSCSI: Failed to send synchronizecache10 command. %s",
439 iscsi_get_error(iscsi));
440 qemu_aio_release(acb);
444 iscsi_set_events(iscsilun);
450 iscsi_unmap_cb(struct iscsi_context *iscsi, int status,
451 void *command_data, void *opaque)
453 IscsiAIOCB *acb = opaque;
455 if (acb->canceled != 0) {
461 error_report("Failed to unmap data on iSCSI lun. %s",
462 iscsi_get_error(iscsi));
466 iscsi_schedule_bh(acb);
469 static BlockDriverAIOCB *
470 iscsi_aio_discard(BlockDriverState *bs,
471 int64_t sector_num, int nb_sectors,
472 BlockDriverCompletionFunc *cb, void *opaque)
474 IscsiLun *iscsilun = bs->opaque;
475 struct iscsi_context *iscsi = iscsilun->iscsi;
477 struct unmap_list list[1];
479 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
481 acb->iscsilun = iscsilun;
484 acb->status = -EINPROGRESS;
486 list[0].lba = sector_qemu2lun(sector_num, iscsilun);
487 list[0].num = nb_sectors * BDRV_SECTOR_SIZE / iscsilun->block_size;
489 acb->task = iscsi_unmap_task(iscsi, iscsilun->lun,
493 if (acb->task == NULL) {
494 error_report("iSCSI: Failed to send unmap command. %s",
495 iscsi_get_error(iscsi));
496 qemu_aio_release(acb);
500 iscsi_set_events(iscsilun);
507 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
508 void *command_data, void *opaque)
510 IscsiAIOCB *acb = opaque;
512 if (acb->canceled != 0) {
518 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
519 iscsi_get_error(iscsi));
523 acb->ioh->driver_status = 0;
524 acb->ioh->host_status = 0;
527 #define SG_ERR_DRIVER_SENSE 0x08
529 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
532 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
534 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
535 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
536 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
537 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
540 iscsi_schedule_bh(acb);
543 static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
544 unsigned long int req, void *buf,
545 BlockDriverCompletionFunc *cb, void *opaque)
547 IscsiLun *iscsilun = bs->opaque;
548 struct iscsi_context *iscsi = iscsilun->iscsi;
549 struct iscsi_data data;
552 assert(req == SG_IO);
554 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
556 acb->iscsilun = iscsilun;
559 acb->status = -EINPROGRESS;
563 acb->task = malloc(sizeof(struct scsi_task));
564 if (acb->task == NULL) {
565 error_report("iSCSI: Failed to allocate task for scsi command. %s",
566 iscsi_get_error(iscsi));
567 qemu_aio_release(acb);
570 memset(acb->task, 0, sizeof(struct scsi_task));
572 switch (acb->ioh->dxfer_direction) {
573 case SG_DXFER_TO_DEV:
574 acb->task->xfer_dir = SCSI_XFER_WRITE;
576 case SG_DXFER_FROM_DEV:
577 acb->task->xfer_dir = SCSI_XFER_READ;
580 acb->task->xfer_dir = SCSI_XFER_NONE;
584 acb->task->cdb_size = acb->ioh->cmd_len;
585 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
586 acb->task->expxferlen = acb->ioh->dxfer_len;
588 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
589 data.data = acb->ioh->dxferp;
590 data.size = acb->ioh->dxfer_len;
592 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
594 (acb->task->xfer_dir == SCSI_XFER_WRITE) ?
597 scsi_free_scsi_task(acb->task);
598 qemu_aio_release(acb);
602 /* tell libiscsi to read straight into the buffer we got from ioctl */
603 if (acb->task->xfer_dir == SCSI_XFER_READ) {
604 scsi_task_add_data_in_buffer(acb->task,
609 iscsi_set_events(iscsilun);
615 static void ioctl_cb(void *opaque, int status)
617 int *p_status = opaque;
621 static int iscsi_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
623 IscsiLun *iscsilun = bs->opaque;
627 case SG_GET_VERSION_NUM:
631 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
634 status = -EINPROGRESS;
635 iscsi_aio_ioctl(bs, req, buf, ioctl_cb, &status);
637 while (status == -EINPROGRESS) {
650 iscsi_getlength(BlockDriverState *bs)
652 IscsiLun *iscsilun = bs->opaque;
655 len = iscsilun->num_blocks;
656 len *= iscsilun->block_size;
661 static int parse_chap(struct iscsi_context *iscsi, const char *target)
665 const char *user = NULL;
666 const char *password = NULL;
668 list = qemu_find_opts("iscsi");
673 opts = qemu_opts_find(list, target);
675 opts = QTAILQ_FIRST(&list->head);
681 user = qemu_opt_get(opts, "user");
686 password = qemu_opt_get(opts, "password");
688 error_report("CHAP username specified but no password was given");
692 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
693 error_report("Failed to set initiator username and password");
700 static void parse_header_digest(struct iscsi_context *iscsi, const char *target)
704 const char *digest = NULL;
706 list = qemu_find_opts("iscsi");
711 opts = qemu_opts_find(list, target);
713 opts = QTAILQ_FIRST(&list->head);
719 digest = qemu_opt_get(opts, "header-digest");
724 if (!strcmp(digest, "CRC32C")) {
725 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
726 } else if (!strcmp(digest, "NONE")) {
727 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
728 } else if (!strcmp(digest, "CRC32C-NONE")) {
729 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
730 } else if (!strcmp(digest, "NONE-CRC32C")) {
731 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
733 error_report("Invalid header-digest setting : %s", digest);
737 static char *parse_initiator_name(const char *target)
741 const char *name = NULL;
742 const char *iscsi_name = qemu_get_vm_name();
744 list = qemu_find_opts("iscsi");
746 opts = qemu_opts_find(list, target);
748 opts = QTAILQ_FIRST(&list->head);
751 name = qemu_opt_get(opts, "initiator-name");
756 return g_strdup(name);
758 return g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
759 iscsi_name ? ":" : "",
760 iscsi_name ? iscsi_name : "");
765 * We support iscsi url's on the form
766 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
768 static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
770 IscsiLun *iscsilun = bs->opaque;
771 struct iscsi_context *iscsi = NULL;
772 struct iscsi_url *iscsi_url = NULL;
773 struct scsi_task *task = NULL;
774 struct scsi_inquiry_standard *inq = NULL;
775 struct scsi_readcapacity10 *rc10 = NULL;
776 struct scsi_readcapacity16 *rc16 = NULL;
777 char *initiator_name = NULL;
780 if ((BDRV_SECTOR_SIZE % 512) != 0) {
781 error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. "
782 "BDRV_SECTOR_SIZE(%lld) is not a multiple "
783 "of 512", BDRV_SECTOR_SIZE);
787 iscsi_url = iscsi_parse_full_url(iscsi, filename);
788 if (iscsi_url == NULL) {
789 error_report("Failed to parse URL : %s", filename);
794 memset(iscsilun, 0, sizeof(IscsiLun));
796 initiator_name = parse_initiator_name(iscsi_url->target);
798 iscsi = iscsi_create_context(initiator_name);
800 error_report("iSCSI: Failed to create iSCSI context.");
805 if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
806 error_report("iSCSI: Failed to set target name.");
811 if (iscsi_url->user != NULL) {
812 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user,
815 error_report("Failed to set initiator username and password");
821 /* check if we got CHAP username/password via the options */
822 if (parse_chap(iscsi, iscsi_url->target) != 0) {
823 error_report("iSCSI: Failed to set CHAP user/password");
828 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
829 error_report("iSCSI: Failed to set session type to normal.");
834 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
836 /* check if we got HEADER_DIGEST via the options */
837 parse_header_digest(iscsi, iscsi_url->target);
839 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
840 error_report("iSCSI: Failed to connect to LUN : %s",
841 iscsi_get_error(iscsi));
846 iscsilun->iscsi = iscsi;
847 iscsilun->lun = iscsi_url->lun;
849 task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36);
851 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
852 error_report("iSCSI: failed to send inquiry command.");
857 inq = scsi_datain_unmarshall(task);
859 error_report("iSCSI: Failed to unmarshall inquiry data.");
864 iscsilun->type = inq->periperal_device_type;
866 scsi_free_scsi_task(task);
868 switch (iscsilun->type) {
870 task = iscsi_readcapacity16_sync(iscsi, iscsilun->lun);
871 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
872 error_report("iSCSI: failed to send readcapacity16 command.");
876 rc16 = scsi_datain_unmarshall(task);
878 error_report("iSCSI: Failed to unmarshall readcapacity16 data.");
882 iscsilun->block_size = rc16->block_length;
883 iscsilun->num_blocks = rc16->returned_lba + 1;
886 task = iscsi_readcapacity10_sync(iscsi, iscsilun->lun, 0, 0);
887 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
888 error_report("iSCSI: failed to send readcapacity10 command.");
892 rc10 = scsi_datain_unmarshall(task);
894 error_report("iSCSI: Failed to unmarshall readcapacity10 data.");
898 iscsilun->block_size = rc10->block_size;
899 if (rc10->lba == 0) {
900 /* blank disk loaded */
901 iscsilun->num_blocks = 0;
903 iscsilun->num_blocks = rc10->lba + 1;
910 bs->total_sectors = iscsilun->num_blocks *
911 iscsilun->block_size / BDRV_SECTOR_SIZE ;
913 /* Medium changer or tape. We dont have any emulation for this so this must
914 * be sg ioctl compatible. We force it to be sg, otherwise qemu will try
915 * to read from the device to guess the image format.
917 if (iscsilun->type == TYPE_MEDIUM_CHANGER ||
918 iscsilun->type == TYPE_TAPE) {
925 if (initiator_name != NULL) {
926 g_free(initiator_name);
928 if (iscsi_url != NULL) {
929 iscsi_destroy_url(iscsi_url);
932 scsi_free_scsi_task(task);
937 iscsi_destroy_context(iscsi);
939 memset(iscsilun, 0, sizeof(IscsiLun));
944 static void iscsi_close(BlockDriverState *bs)
946 IscsiLun *iscsilun = bs->opaque;
947 struct iscsi_context *iscsi = iscsilun->iscsi;
949 qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL, NULL);
950 iscsi_destroy_context(iscsi);
951 memset(iscsilun, 0, sizeof(IscsiLun));
954 static int iscsi_has_zero_init(BlockDriverState *bs)
959 static BlockDriver bdrv_iscsi = {
960 .format_name = "iscsi",
961 .protocol_name = "iscsi",
963 .instance_size = sizeof(IscsiLun),
964 .bdrv_file_open = iscsi_open,
965 .bdrv_close = iscsi_close,
967 .bdrv_getlength = iscsi_getlength,
969 .bdrv_aio_readv = iscsi_aio_readv,
970 .bdrv_aio_writev = iscsi_aio_writev,
971 .bdrv_aio_flush = iscsi_aio_flush,
973 .bdrv_aio_discard = iscsi_aio_discard,
974 .bdrv_has_zero_init = iscsi_has_zero_init,
977 .bdrv_ioctl = iscsi_ioctl,
978 .bdrv_aio_ioctl = iscsi_aio_ioctl,
982 static void iscsi_block_init(void)
984 bdrv_register(&bdrv_iscsi);
987 block_init(iscsi_block_init);