2 * QEMU Block driver for iSCSI images
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:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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
26 #include "qemu/osdep.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"
39 #include "qemu/uuid.h"
40 #include "qmp-commands.h"
41 #include "qapi/qmp/qstring.h"
42 #include "crypto/secret.h"
44 #include <iscsi/iscsi.h>
45 #include <iscsi/scsi-lowlevel.h>
51 typedef struct IscsiLun {
52 struct iscsi_context *iscsi;
53 AioContext *aio_context;
55 enum scsi_inquiry_peripheral_device_type type;
60 QEMUTimer *event_timer;
62 struct scsi_inquiry_logical_block_provisioning lbp;
63 struct scsi_inquiry_block_limits bl;
64 unsigned char *zeroblock;
65 /* The allocmap tracks which clusters (pages) on the iSCSI target are
66 * allocated and which are not. In case a target returns zeros for
67 * unallocated pages (iscsilun->lprz) we can directly return zeros instead
68 * of reading zeros over the wire if a read request falls within an
69 * unallocated block. As there are 3 possible states we need 2 bitmaps to
70 * track. allocmap_valid keeps track if QEMU's information about a page is
71 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no
72 * valid information about a page the corresponding allocmap entry should be
73 * switched to unallocated as well to force a new lookup of the allocation
74 * status as lookups are generally skipped if a page is suspect to be
75 * allocated. If a iSCSI target is opened with cache.direct = on the
76 * allocmap_valid does not exist turning all cached information invalid so
77 * that a fresh lookup is made for any page even if allocmap entry returns
78 * it's unallocated. */
79 unsigned long *allocmap;
80 unsigned long *allocmap_valid;
89 bool request_timed_out;
92 typedef struct IscsiTask {
97 struct scsi_task *task;
100 QEMUTimer retry_timer;
104 typedef struct IscsiAIOCB {
108 struct scsi_task *task;
119 /* libiscsi uses time_t so its enough to process events every second */
120 #define EVENT_INTERVAL 1000
121 #define NOP_INTERVAL 5000
122 #define MAX_NOP_FAILURES 3
123 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
124 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
126 /* this threshold is a trade-off knob to choose between
127 * the potential additional overhead of an extra GET_LBA_STATUS request
128 * vs. unnecessarily reading a lot of zero sectors over the wire.
129 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
130 * sectors we check the allocation status of the area covered by the
131 * request first if the allocationmap indicates that the area might be
133 #define ISCSI_CHECKALLOC_THRES 64
140 qemu_bh_delete(acb->bh);
145 acb->common.cb(acb->common.opaque, acb->status);
147 if (acb->task != NULL) {
148 scsi_free_scsi_task(acb->task);
156 iscsi_schedule_bh(IscsiAIOCB *acb)
161 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
162 qemu_bh_schedule(acb->bh);
165 static void iscsi_co_generic_bh_cb(void *opaque)
167 struct IscsiTask *iTask = opaque;
170 aio_co_wake(iTask->co);
173 static void iscsi_retry_timer_expired(void *opaque)
175 struct IscsiTask *iTask = opaque;
178 aio_co_wake(iTask->co);
182 static inline unsigned exp_random(double mean)
184 return -mean * log((double)rand() / RAND_MAX);
187 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
188 * libiscsi 1.10.0, together with other constants we need. Use it as
189 * a hint that we have to define them ourselves if needed, to keep the
190 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
191 * the test because SCSI_STATUS_* is an enum.
193 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
194 * an enum, check against the LIBISCSI_API_VERSION macro, which was
195 * introduced in 1.11.0. If it is present, there is no need to define
198 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
199 !defined(LIBISCSI_API_VERSION)
200 #define SCSI_STATUS_TASK_SET_FULL 0x28
201 #define SCSI_STATUS_TIMEOUT 0x0f000002
202 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
203 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
206 #ifndef LIBISCSI_API_VERSION
207 #define LIBISCSI_API_VERSION 20130701
210 static int iscsi_translate_sense(struct scsi_sense *sense)
214 switch (sense->key) {
215 case SCSI_SENSE_NOT_READY:
217 case SCSI_SENSE_DATA_PROTECTION:
219 case SCSI_SENSE_COMMAND_ABORTED:
221 case SCSI_SENSE_ILLEGAL_REQUEST:
227 switch (sense->ascq) {
228 case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR:
229 case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE:
230 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB:
231 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST:
234 case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE:
237 case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED:
240 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT:
241 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED:
242 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN:
245 case SCSI_SENSE_ASCQ_WRITE_PROTECTED:
255 /* Called (via iscsi_service) with QemuMutex held. */
257 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
258 void *command_data, void *opaque)
260 struct IscsiTask *iTask = opaque;
261 struct scsi_task *task = command_data;
263 iTask->status = status;
267 if (status != SCSI_STATUS_GOOD) {
268 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
269 if (status == SCSI_STATUS_CHECK_CONDITION
270 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
271 error_report("iSCSI CheckCondition: %s",
272 iscsi_get_error(iscsi));
276 if (status == SCSI_STATUS_BUSY ||
277 status == SCSI_STATUS_TIMEOUT ||
278 status == SCSI_STATUS_TASK_SET_FULL) {
279 unsigned retry_time =
280 exp_random(iscsi_retry_times[iTask->retries - 1]);
281 if (status == SCSI_STATUS_TIMEOUT) {
282 /* make sure the request is rescheduled AFTER the
283 * reconnect is initiated */
284 retry_time = EVENT_INTERVAL * 2;
285 iTask->iscsilun->request_timed_out = true;
287 error_report("iSCSI Busy/TaskSetFull/TimeOut"
288 " (retry #%u in %u ms): %s",
289 iTask->retries, retry_time,
290 iscsi_get_error(iscsi));
291 aio_timer_init(iTask->iscsilun->aio_context,
292 &iTask->retry_timer, QEMU_CLOCK_REALTIME,
293 SCALE_MS, iscsi_retry_timer_expired, iTask);
294 timer_mod(&iTask->retry_timer,
295 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
300 iTask->err_code = iscsi_translate_sense(&task->sense);
301 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
306 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context,
307 iscsi_co_generic_bh_cb, iTask);
313 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
315 *iTask = (struct IscsiTask) {
316 .co = qemu_coroutine_self(),
317 .iscsilun = iscsilun,
322 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
325 IscsiAIOCB *acb = private_data;
327 acb->status = -ECANCELED;
328 iscsi_schedule_bh(acb);
332 iscsi_aio_cancel(BlockAIOCB *blockacb)
334 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
335 IscsiLun *iscsilun = acb->iscsilun;
337 if (acb->status != -EINPROGRESS) {
341 /* send a task mgmt call to the target to cancel the task on the target */
342 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
343 iscsi_abort_task_cb, acb);
347 static const AIOCBInfo iscsi_aiocb_info = {
348 .aiocb_size = sizeof(IscsiAIOCB),
349 .cancel_async = iscsi_aio_cancel,
353 static void iscsi_process_read(void *arg);
354 static void iscsi_process_write(void *arg);
356 /* Called with QemuMutex held. */
358 iscsi_set_events(IscsiLun *iscsilun)
360 struct iscsi_context *iscsi = iscsilun->iscsi;
361 int ev = iscsi_which_events(iscsi);
363 if (ev != iscsilun->events) {
364 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
366 (ev & POLLIN) ? iscsi_process_read : NULL,
367 (ev & POLLOUT) ? iscsi_process_write : NULL,
370 iscsilun->events = ev;
374 static void iscsi_timed_check_events(void *opaque)
376 IscsiLun *iscsilun = opaque;
378 /* check for timed out requests */
379 iscsi_service(iscsilun->iscsi, 0);
381 if (iscsilun->request_timed_out) {
382 iscsilun->request_timed_out = false;
383 iscsi_reconnect(iscsilun->iscsi);
386 /* newer versions of libiscsi may return zero events. Ensure we are able
387 * to return to service once this situation changes. */
388 iscsi_set_events(iscsilun);
390 timer_mod(iscsilun->event_timer,
391 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
395 iscsi_process_read(void *arg)
397 IscsiLun *iscsilun = arg;
398 struct iscsi_context *iscsi = iscsilun->iscsi;
400 qemu_mutex_lock(&iscsilun->mutex);
401 iscsi_service(iscsi, POLLIN);
402 iscsi_set_events(iscsilun);
403 qemu_mutex_unlock(&iscsilun->mutex);
407 iscsi_process_write(void *arg)
409 IscsiLun *iscsilun = arg;
410 struct iscsi_context *iscsi = iscsilun->iscsi;
412 qemu_mutex_lock(&iscsilun->mutex);
413 iscsi_service(iscsi, POLLOUT);
414 iscsi_set_events(iscsilun);
415 qemu_mutex_unlock(&iscsilun->mutex);
418 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
420 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
423 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
425 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
428 static bool is_byte_request_lun_aligned(int64_t offset, int count,
431 if (offset % iscsilun->block_size || count % iscsilun->block_size) {
432 error_report("iSCSI misaligned request: "
433 "iscsilun->block_size %u, offset %" PRIi64
435 iscsilun->block_size, offset, count);
441 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
444 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
445 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
446 nb_sectors << BDRV_SECTOR_BITS,
450 static void iscsi_allocmap_free(IscsiLun *iscsilun)
452 g_free(iscsilun->allocmap);
453 g_free(iscsilun->allocmap_valid);
454 iscsilun->allocmap = NULL;
455 iscsilun->allocmap_valid = NULL;
459 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
461 iscsi_allocmap_free(iscsilun);
463 iscsilun->allocmap_size =
464 DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun),
465 iscsilun->cluster_sectors);
467 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
468 if (!iscsilun->allocmap) {
472 if (open_flags & BDRV_O_NOCACHE) {
473 /* in case that cache.direct = on all allocmap entries are
474 * treated as invalid to force a relookup of the block
475 * status on every read request */
479 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size);
480 if (!iscsilun->allocmap_valid) {
481 /* if we are under memory pressure free the allocmap as well */
482 iscsi_allocmap_free(iscsilun);
490 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num,
491 int nb_sectors, bool allocated, bool valid)
493 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
495 if (iscsilun->allocmap == NULL) {
498 /* expand to entirely contain all affected clusters */
499 cl_num_expanded = sector_num / iscsilun->cluster_sectors;
500 nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors,
501 iscsilun->cluster_sectors) - cl_num_expanded;
502 /* shrink to touch only completely contained clusters */
503 cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors);
504 nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors
507 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
509 if (nb_cls_shrunk > 0) {
510 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk);
514 if (iscsilun->allocmap_valid == NULL) {
518 if (nb_cls_shrunk > 0) {
519 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk);
522 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded,
528 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num,
531 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true);
535 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num,
538 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
539 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
541 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true);
544 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num,
547 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false);
550 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
552 if (iscsilun->allocmap) {
553 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size);
555 if (iscsilun->allocmap_valid) {
556 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size);
561 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num,
565 if (iscsilun->allocmap == NULL) {
568 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
569 return !(find_next_bit(iscsilun->allocmap, size,
570 sector_num / iscsilun->cluster_sectors) == size);
573 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
574 int64_t sector_num, int nb_sectors)
577 if (iscsilun->allocmap_valid == NULL) {
580 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
581 return (find_next_zero_bit(iscsilun->allocmap_valid, size,
582 sector_num / iscsilun->cluster_sectors) == size);
585 static int coroutine_fn
586 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
587 QEMUIOVector *iov, int flags)
589 IscsiLun *iscsilun = bs->opaque;
590 struct IscsiTask iTask;
592 uint32_t num_sectors;
593 bool fua = flags & BDRV_REQ_FUA;
597 assert(iscsilun->dpofua);
599 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
603 if (bs->bl.max_transfer) {
604 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
607 lba = sector_qemu2lun(sector_num, iscsilun);
608 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
609 iscsi_co_init_iscsitask(iscsilun, &iTask);
610 qemu_mutex_lock(&iscsilun->mutex);
612 if (iscsilun->use_16_for_rw) {
613 #if LIBISCSI_API_VERSION >= (20160603)
614 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
615 NULL, num_sectors * iscsilun->block_size,
616 iscsilun->block_size, 0, 0, fua, 0, 0,
617 iscsi_co_generic_cb, &iTask,
618 (struct scsi_iovec *)iov->iov, iov->niov);
620 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
621 NULL, num_sectors * iscsilun->block_size,
622 iscsilun->block_size, 0, 0, fua, 0, 0,
623 iscsi_co_generic_cb, &iTask,
624 (struct scsi_iovec *)iov->iov, iov->niov);
627 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
628 NULL, num_sectors * iscsilun->block_size,
629 iscsilun->block_size, 0, 0, fua, 0, 0,
630 iscsi_co_generic_cb, &iTask);
632 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
633 NULL, num_sectors * iscsilun->block_size,
634 iscsilun->block_size, 0, 0, fua, 0, 0,
635 iscsi_co_generic_cb, &iTask);
638 if (iTask.task == NULL) {
639 qemu_mutex_unlock(&iscsilun->mutex);
642 #if LIBISCSI_API_VERSION < (20160603)
643 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
646 while (!iTask.complete) {
647 iscsi_set_events(iscsilun);
648 qemu_mutex_unlock(&iscsilun->mutex);
649 qemu_coroutine_yield();
650 qemu_mutex_lock(&iscsilun->mutex);
653 if (iTask.task != NULL) {
654 scsi_free_scsi_task(iTask.task);
658 if (iTask.do_retry) {
663 if (iTask.status != SCSI_STATUS_GOOD) {
664 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors);
669 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors);
672 qemu_mutex_unlock(&iscsilun->mutex);
678 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
680 int nb_sectors, int *pnum,
681 BlockDriverState **file)
683 IscsiLun *iscsilun = bs->opaque;
684 struct scsi_get_lba_status *lbas = NULL;
685 struct scsi_lba_status_descriptor *lbasd = NULL;
686 struct IscsiTask iTask;
689 iscsi_co_init_iscsitask(iscsilun, &iTask);
691 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
696 /* default to all sectors allocated */
697 ret = BDRV_BLOCK_DATA;
698 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID;
701 /* LUN does not support logical block provisioning */
702 if (!iscsilun->lbpme) {
706 qemu_mutex_lock(&iscsilun->mutex);
708 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
709 sector_qemu2lun(sector_num, iscsilun),
710 8 + 16, iscsi_co_generic_cb,
716 while (!iTask.complete) {
717 iscsi_set_events(iscsilun);
718 qemu_mutex_unlock(&iscsilun->mutex);
719 qemu_coroutine_yield();
720 qemu_mutex_lock(&iscsilun->mutex);
723 if (iTask.do_retry) {
724 if (iTask.task != NULL) {
725 scsi_free_scsi_task(iTask.task);
732 if (iTask.status != SCSI_STATUS_GOOD) {
733 /* in case the get_lba_status_callout fails (i.e.
734 * because the device is busy or the cmd is not
735 * supported) we pretend all blocks are allocated
736 * for backwards compatibility */
740 lbas = scsi_datain_unmarshall(iTask.task);
746 lbasd = &lbas->descriptors[0];
748 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) {
753 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun);
755 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
756 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
757 ret &= ~BDRV_BLOCK_DATA;
758 if (iscsilun->lbprz) {
759 ret |= BDRV_BLOCK_ZERO;
763 if (ret & BDRV_BLOCK_ZERO) {
764 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum);
766 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum);
769 if (*pnum > nb_sectors) {
773 qemu_mutex_unlock(&iscsilun->mutex);
775 if (iTask.task != NULL) {
776 scsi_free_scsi_task(iTask.task);
778 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) {
784 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
785 int64_t sector_num, int nb_sectors,
788 IscsiLun *iscsilun = bs->opaque;
789 struct IscsiTask iTask;
791 uint32_t num_sectors;
793 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
797 if (bs->bl.max_transfer) {
798 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
801 /* if cache.direct is off and we have a valid entry in our allocation map
802 * we can skip checking the block status and directly return zeroes if
803 * the request falls within an unallocated area */
804 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
805 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
806 qemu_iovec_memset(iov, 0, 0x00, iov->size);
810 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
811 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
812 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
814 BlockDriverState *file;
815 /* check the block status from the beginning of the cluster
816 * containing the start sector */
817 int64_t ret = iscsi_co_get_block_status(bs,
818 sector_num - sector_num % iscsilun->cluster_sectors,
819 BDRV_REQUEST_MAX_SECTORS, &pnum, &file);
823 /* if the whole request falls into an unallocated area we can avoid
824 * to read and directly return zeroes instead */
825 if (ret & BDRV_BLOCK_ZERO &&
826 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) {
827 qemu_iovec_memset(iov, 0, 0x00, iov->size);
832 lba = sector_qemu2lun(sector_num, iscsilun);
833 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
835 iscsi_co_init_iscsitask(iscsilun, &iTask);
836 qemu_mutex_lock(&iscsilun->mutex);
838 if (iscsilun->use_16_for_rw) {
839 #if LIBISCSI_API_VERSION >= (20160603)
840 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
841 num_sectors * iscsilun->block_size,
842 iscsilun->block_size, 0, 0, 0, 0, 0,
843 iscsi_co_generic_cb, &iTask,
844 (struct scsi_iovec *)iov->iov, iov->niov);
846 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
847 num_sectors * iscsilun->block_size,
848 iscsilun->block_size,
850 iscsi_co_generic_cb, &iTask,
851 (struct scsi_iovec *)iov->iov, iov->niov);
854 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
855 num_sectors * iscsilun->block_size,
856 iscsilun->block_size, 0, 0, 0, 0, 0,
857 iscsi_co_generic_cb, &iTask);
859 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
860 num_sectors * iscsilun->block_size,
861 iscsilun->block_size,
863 iscsi_co_generic_cb, &iTask);
866 if (iTask.task == NULL) {
867 qemu_mutex_unlock(&iscsilun->mutex);
870 #if LIBISCSI_API_VERSION < (20160603)
871 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
873 while (!iTask.complete) {
874 iscsi_set_events(iscsilun);
875 qemu_mutex_unlock(&iscsilun->mutex);
876 qemu_coroutine_yield();
877 qemu_mutex_lock(&iscsilun->mutex);
880 if (iTask.task != NULL) {
881 scsi_free_scsi_task(iTask.task);
885 if (iTask.do_retry) {
889 qemu_mutex_unlock(&iscsilun->mutex);
891 if (iTask.status != SCSI_STATUS_GOOD) {
892 return iTask.err_code;
898 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
900 IscsiLun *iscsilun = bs->opaque;
901 struct IscsiTask iTask;
903 iscsi_co_init_iscsitask(iscsilun, &iTask);
904 qemu_mutex_lock(&iscsilun->mutex);
906 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
907 0, iscsi_co_generic_cb, &iTask) == NULL) {
908 qemu_mutex_unlock(&iscsilun->mutex);
912 while (!iTask.complete) {
913 iscsi_set_events(iscsilun);
914 qemu_mutex_unlock(&iscsilun->mutex);
915 qemu_coroutine_yield();
916 qemu_mutex_lock(&iscsilun->mutex);
919 if (iTask.task != NULL) {
920 scsi_free_scsi_task(iTask.task);
924 if (iTask.do_retry) {
928 qemu_mutex_unlock(&iscsilun->mutex);
930 if (iTask.status != SCSI_STATUS_GOOD) {
931 return iTask.err_code;
938 /* Called (via iscsi_service) with QemuMutex held. */
940 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
941 void *command_data, void *opaque)
943 IscsiAIOCB *acb = opaque;
950 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
951 iscsi_get_error(iscsi));
952 acb->status = iscsi_translate_sense(&acb->task->sense);
955 acb->ioh->driver_status = 0;
956 acb->ioh->host_status = 0;
958 acb->ioh->status = status;
960 #define SG_ERR_DRIVER_SENSE 0x08
962 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
965 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
967 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
968 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
969 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
970 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
973 iscsi_schedule_bh(acb);
976 static void iscsi_ioctl_bh_completion(void *opaque)
978 IscsiAIOCB *acb = opaque;
980 qemu_bh_delete(acb->bh);
981 acb->common.cb(acb->common.opaque, acb->ret);
985 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
987 BlockDriverState *bs = acb->common.bs;
988 IscsiLun *iscsilun = bs->opaque;
992 case SG_GET_VERSION_NUM:
996 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
1002 acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
1003 iscsi_ioctl_bh_completion, acb);
1005 qemu_bh_schedule(acb->bh);
1008 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
1009 unsigned long int req, void *buf,
1010 BlockCompletionFunc *cb, void *opaque)
1012 IscsiLun *iscsilun = bs->opaque;
1013 struct iscsi_context *iscsi = iscsilun->iscsi;
1014 struct iscsi_data data;
1017 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
1019 acb->iscsilun = iscsilun;
1021 acb->status = -EINPROGRESS;
1026 iscsi_ioctl_handle_emulated(acb, req, buf);
1027 return &acb->common;
1030 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
1031 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
1032 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
1033 qemu_aio_unref(acb);
1037 acb->task = malloc(sizeof(struct scsi_task));
1038 if (acb->task == NULL) {
1039 error_report("iSCSI: Failed to allocate task for scsi command. %s",
1040 iscsi_get_error(iscsi));
1041 qemu_aio_unref(acb);
1044 memset(acb->task, 0, sizeof(struct scsi_task));
1046 switch (acb->ioh->dxfer_direction) {
1047 case SG_DXFER_TO_DEV:
1048 acb->task->xfer_dir = SCSI_XFER_WRITE;
1050 case SG_DXFER_FROM_DEV:
1051 acb->task->xfer_dir = SCSI_XFER_READ;
1054 acb->task->xfer_dir = SCSI_XFER_NONE;
1058 acb->task->cdb_size = acb->ioh->cmd_len;
1059 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
1060 acb->task->expxferlen = acb->ioh->dxfer_len;
1063 qemu_mutex_lock(&iscsilun->mutex);
1064 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
1065 if (acb->ioh->iovec_count == 0) {
1066 data.data = acb->ioh->dxferp;
1067 data.size = acb->ioh->dxfer_len;
1069 scsi_task_set_iov_out(acb->task,
1070 (struct scsi_iovec *) acb->ioh->dxferp,
1071 acb->ioh->iovec_count);
1075 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1077 (data.size > 0) ? &data : NULL,
1079 qemu_mutex_unlock(&iscsilun->mutex);
1080 scsi_free_scsi_task(acb->task);
1081 qemu_aio_unref(acb);
1085 /* tell libiscsi to read straight into the buffer we got from ioctl */
1086 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1087 if (acb->ioh->iovec_count == 0) {
1088 scsi_task_add_data_in_buffer(acb->task,
1089 acb->ioh->dxfer_len,
1092 scsi_task_set_iov_in(acb->task,
1093 (struct scsi_iovec *) acb->ioh->dxferp,
1094 acb->ioh->iovec_count);
1098 iscsi_set_events(iscsilun);
1099 qemu_mutex_unlock(&iscsilun->mutex);
1101 return &acb->common;
1107 iscsi_getlength(BlockDriverState *bs)
1109 IscsiLun *iscsilun = bs->opaque;
1112 len = iscsilun->num_blocks;
1113 len *= iscsilun->block_size;
1119 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
1121 IscsiLun *iscsilun = bs->opaque;
1122 struct IscsiTask iTask;
1123 struct unmap_list list;
1126 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1130 if (!iscsilun->lbp.lbpu) {
1131 /* UNMAP is not supported by the target */
1135 list.lba = offset / iscsilun->block_size;
1136 list.num = bytes / iscsilun->block_size;
1138 iscsi_co_init_iscsitask(iscsilun, &iTask);
1139 qemu_mutex_lock(&iscsilun->mutex);
1141 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1142 iscsi_co_generic_cb, &iTask) == NULL) {
1147 while (!iTask.complete) {
1148 iscsi_set_events(iscsilun);
1149 qemu_mutex_unlock(&iscsilun->mutex);
1150 qemu_coroutine_yield();
1151 qemu_mutex_lock(&iscsilun->mutex);
1154 if (iTask.task != NULL) {
1155 scsi_free_scsi_task(iTask.task);
1159 if (iTask.do_retry) {
1164 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1165 /* the target might fail with a check condition if it
1166 is not happy with the alignment of the UNMAP request
1167 we silently fail in this case */
1171 if (iTask.status != SCSI_STATUS_GOOD) {
1176 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1177 bytes >> BDRV_SECTOR_BITS);
1180 qemu_mutex_unlock(&iscsilun->mutex);
1185 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1186 int bytes, BdrvRequestFlags flags)
1188 IscsiLun *iscsilun = bs->opaque;
1189 struct IscsiTask iTask;
1192 bool use_16_for_ws = iscsilun->use_16_for_rw;
1195 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1199 if (flags & BDRV_REQ_MAY_UNMAP) {
1200 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1201 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1202 use_16_for_ws = true;
1204 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1205 /* WRITESAME16 with UNMAP is not supported by the target,
1206 * fall back and try WRITESAME10/16 without UNMAP */
1207 flags &= ~BDRV_REQ_MAY_UNMAP;
1208 use_16_for_ws = iscsilun->use_16_for_rw;
1212 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1213 /* WRITESAME without UNMAP is not supported by the target */
1217 lba = offset / iscsilun->block_size;
1218 nb_blocks = bytes / iscsilun->block_size;
1220 if (iscsilun->zeroblock == NULL) {
1221 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1222 if (iscsilun->zeroblock == NULL) {
1227 qemu_mutex_lock(&iscsilun->mutex);
1228 iscsi_co_init_iscsitask(iscsilun, &iTask);
1230 if (use_16_for_ws) {
1231 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1232 iscsilun->zeroblock, iscsilun->block_size,
1233 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1234 0, 0, iscsi_co_generic_cb, &iTask);
1236 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1237 iscsilun->zeroblock, iscsilun->block_size,
1238 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1239 0, 0, iscsi_co_generic_cb, &iTask);
1241 if (iTask.task == NULL) {
1242 qemu_mutex_unlock(&iscsilun->mutex);
1246 while (!iTask.complete) {
1247 iscsi_set_events(iscsilun);
1248 qemu_mutex_unlock(&iscsilun->mutex);
1249 qemu_coroutine_yield();
1250 qemu_mutex_lock(&iscsilun->mutex);
1253 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1254 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1255 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1256 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1257 /* WRITE SAME is not supported by the target */
1258 iscsilun->has_write_same = false;
1259 scsi_free_scsi_task(iTask.task);
1264 if (iTask.task != NULL) {
1265 scsi_free_scsi_task(iTask.task);
1269 if (iTask.do_retry) {
1274 if (iTask.status != SCSI_STATUS_GOOD) {
1275 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1276 bytes >> BDRV_SECTOR_BITS);
1281 if (flags & BDRV_REQ_MAY_UNMAP) {
1282 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1283 bytes >> BDRV_SECTOR_BITS);
1285 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS,
1286 bytes >> BDRV_SECTOR_BITS);
1290 qemu_mutex_unlock(&iscsilun->mutex);
1294 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
1297 const char *user = NULL;
1298 const char *password = NULL;
1299 const char *secretid;
1300 char *secret = NULL;
1302 user = qemu_opt_get(opts, "user");
1307 secretid = qemu_opt_get(opts, "password-secret");
1308 password = qemu_opt_get(opts, "password");
1309 if (secretid && password) {
1310 error_setg(errp, "'password' and 'password-secret' properties are "
1311 "mutually exclusive");
1315 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1320 } else if (!password) {
1321 error_setg(errp, "CHAP username specified but no password was given");
1325 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1326 error_setg(errp, "Failed to set initiator username and password");
1332 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts,
1335 const char *digest = NULL;
1337 digest = qemu_opt_get(opts, "header-digest");
1339 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1340 } else if (!strcmp(digest, "crc32c")) {
1341 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1342 } else if (!strcmp(digest, "none")) {
1343 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1344 } else if (!strcmp(digest, "crc32c-none")) {
1345 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1346 } else if (!strcmp(digest, "none-crc32c")) {
1347 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1349 error_setg(errp, "Invalid header-digest setting : %s", digest);
1353 static char *get_initiator_name(QemuOpts *opts)
1357 UuidInfo *uuid_info;
1359 name = qemu_opt_get(opts, "initiator-name");
1361 return g_strdup(name);
1364 uuid_info = qmp_query_uuid(NULL);
1365 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1366 name = qemu_get_vm_name();
1368 name = uuid_info->UUID;
1370 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1371 name ? ":" : "", name ? name : "");
1372 qapi_free_UuidInfo(uuid_info);
1376 static void iscsi_nop_timed_event(void *opaque)
1378 IscsiLun *iscsilun = opaque;
1380 qemu_mutex_lock(&iscsilun->mutex);
1381 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1382 error_report("iSCSI: NOP timeout. Reconnecting...");
1383 iscsilun->request_timed_out = true;
1384 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1385 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1389 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1390 iscsi_set_events(iscsilun);
1393 qemu_mutex_unlock(&iscsilun->mutex);
1396 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1398 struct scsi_task *task = NULL;
1399 struct scsi_readcapacity10 *rc10 = NULL;
1400 struct scsi_readcapacity16 *rc16 = NULL;
1401 int retries = ISCSI_CMD_RETRIES;
1405 scsi_free_scsi_task(task);
1409 switch (iscsilun->type) {
1411 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1412 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1413 rc16 = scsi_datain_unmarshall(task);
1415 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1417 iscsilun->block_size = rc16->block_length;
1418 iscsilun->num_blocks = rc16->returned_lba + 1;
1419 iscsilun->lbpme = !!rc16->lbpme;
1420 iscsilun->lbprz = !!rc16->lbprz;
1421 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1425 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1426 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1429 /* Fall through and try READ CAPACITY(10) instead. */
1431 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1432 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1433 rc10 = scsi_datain_unmarshall(task);
1435 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1437 iscsilun->block_size = rc10->block_size;
1438 if (rc10->lba == 0) {
1439 /* blank disk loaded */
1440 iscsilun->num_blocks = 0;
1442 iscsilun->num_blocks = rc10->lba + 1;
1450 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1451 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1454 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1455 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1456 } else if (!iscsilun->block_size ||
1457 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1458 error_setg(errp, "iSCSI: the target returned an invalid "
1459 "block size of %d.", iscsilun->block_size);
1462 scsi_free_scsi_task(task);
1466 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1467 int evpd, int pc, void **inq, Error **errp)
1470 struct scsi_task *task = NULL;
1471 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1472 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1475 full_size = scsi_datain_getfullsize(task);
1476 if (full_size > task->datain.size) {
1477 scsi_free_scsi_task(task);
1479 /* we need more data for the full list */
1480 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1481 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1486 *inq = scsi_datain_unmarshall(task);
1488 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1495 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1496 iscsi_get_error(iscsi));
1499 scsi_free_scsi_task(task);
1504 static void iscsi_detach_aio_context(BlockDriverState *bs)
1506 IscsiLun *iscsilun = bs->opaque;
1508 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1509 false, NULL, NULL, NULL, NULL);
1510 iscsilun->events = 0;
1512 if (iscsilun->nop_timer) {
1513 timer_del(iscsilun->nop_timer);
1514 timer_free(iscsilun->nop_timer);
1515 iscsilun->nop_timer = NULL;
1517 if (iscsilun->event_timer) {
1518 timer_del(iscsilun->event_timer);
1519 timer_free(iscsilun->event_timer);
1520 iscsilun->event_timer = NULL;
1524 static void iscsi_attach_aio_context(BlockDriverState *bs,
1525 AioContext *new_context)
1527 IscsiLun *iscsilun = bs->opaque;
1529 iscsilun->aio_context = new_context;
1530 iscsi_set_events(iscsilun);
1532 /* Set up a timer for sending out iSCSI NOPs */
1533 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1534 QEMU_CLOCK_REALTIME, SCALE_MS,
1535 iscsi_nop_timed_event, iscsilun);
1536 timer_mod(iscsilun->nop_timer,
1537 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1539 /* Set up a timer for periodic calls to iscsi_set_events and to
1540 * scan for command timeout */
1541 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1542 QEMU_CLOCK_REALTIME, SCALE_MS,
1543 iscsi_timed_check_events, iscsilun);
1544 timer_mod(iscsilun->event_timer,
1545 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1548 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1550 struct scsi_task *task;
1551 struct scsi_mode_sense *ms = NULL;
1552 iscsilun->write_protected = false;
1553 iscsilun->dpofua = false;
1555 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1556 1, SCSI_MODESENSE_PC_CURRENT,
1559 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1560 iscsi_get_error(iscsilun->iscsi));
1564 if (task->status != SCSI_STATUS_GOOD) {
1565 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1568 ms = scsi_datain_unmarshall(task);
1570 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1571 iscsi_get_error(iscsilun->iscsi));
1574 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1575 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1579 scsi_free_scsi_task(task);
1583 static void iscsi_parse_iscsi_option(const char *target, QDict *options)
1587 const char *user, *password, *password_secret, *initiator_name,
1588 *header_digest, *timeout;
1590 list = qemu_find_opts("iscsi");
1595 opts = qemu_opts_find(list, target);
1597 opts = QTAILQ_FIRST(&list->head);
1603 user = qemu_opt_get(opts, "user");
1605 qdict_set_default_str(options, "user", user);
1608 password = qemu_opt_get(opts, "password");
1610 qdict_set_default_str(options, "password", password);
1613 password_secret = qemu_opt_get(opts, "password-secret");
1614 if (password_secret) {
1615 qdict_set_default_str(options, "password-secret", password_secret);
1618 initiator_name = qemu_opt_get(opts, "initiator-name");
1619 if (initiator_name) {
1620 qdict_set_default_str(options, "initiator-name", initiator_name);
1623 header_digest = qemu_opt_get(opts, "header-digest");
1624 if (header_digest) {
1625 /* -iscsi takes upper case values, but QAPI only supports lower case
1626 * enum constant names, so we have to convert here. */
1627 char *qapi_value = g_ascii_strdown(header_digest, -1);
1628 qdict_set_default_str(options, "header-digest", qapi_value);
1632 timeout = qemu_opt_get(opts, "timeout");
1634 qdict_set_default_str(options, "timeout", timeout);
1639 * We support iscsi url's on the form
1640 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1642 static void iscsi_parse_filename(const char *filename, QDict *options,
1645 struct iscsi_url *iscsi_url;
1646 const char *transport_name;
1649 iscsi_url = iscsi_parse_full_url(NULL, filename);
1650 if (iscsi_url == NULL) {
1651 error_setg(errp, "Failed to parse URL : %s", filename);
1655 #if LIBISCSI_API_VERSION >= (20160603)
1656 switch (iscsi_url->transport) {
1658 transport_name = "tcp";
1660 case ISER_TRANSPORT:
1661 transport_name = "iser";
1664 error_setg(errp, "Unknown transport type (%d)",
1665 iscsi_url->transport);
1669 transport_name = "tcp";
1672 qdict_set_default_str(options, "transport", transport_name);
1673 qdict_set_default_str(options, "portal", iscsi_url->portal);
1674 qdict_set_default_str(options, "target", iscsi_url->target);
1676 lun_str = g_strdup_printf("%d", iscsi_url->lun);
1677 qdict_set_default_str(options, "lun", lun_str);
1680 /* User/password from -iscsi take precedence over those from the URL */
1681 iscsi_parse_iscsi_option(iscsi_url->target, options);
1683 if (iscsi_url->user[0] != '\0') {
1684 qdict_set_default_str(options, "user", iscsi_url->user);
1685 qdict_set_default_str(options, "password", iscsi_url->passwd);
1688 iscsi_destroy_url(iscsi_url);
1691 static QemuOptsList runtime_opts = {
1693 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1696 .name = "transport",
1697 .type = QEMU_OPT_STRING,
1701 .type = QEMU_OPT_STRING,
1705 .type = QEMU_OPT_STRING,
1709 .type = QEMU_OPT_STRING,
1713 .type = QEMU_OPT_STRING,
1716 .name = "password-secret",
1717 .type = QEMU_OPT_STRING,
1721 .type = QEMU_OPT_NUMBER,
1724 .name = "initiator-name",
1725 .type = QEMU_OPT_STRING,
1728 .name = "header-digest",
1729 .type = QEMU_OPT_STRING,
1733 .type = QEMU_OPT_NUMBER,
1737 .type = QEMU_OPT_STRING,
1739 { /* end of list */ }
1743 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1746 IscsiLun *iscsilun = bs->opaque;
1747 struct iscsi_context *iscsi = NULL;
1748 struct scsi_task *task = NULL;
1749 struct scsi_inquiry_standard *inq = NULL;
1750 struct scsi_inquiry_supported_pages *inq_vpd;
1751 char *initiator_name = NULL;
1753 Error *local_err = NULL;
1754 const char *transport_name, *portal, *target, *filename;
1755 #if LIBISCSI_API_VERSION >= (20160603)
1756 enum iscsi_transport_type transport;
1758 int i, ret = 0, timeout = 0, lun;
1760 /* If we are given a filename, parse the filename, with precedence given to
1761 * filename encoded options */
1762 filename = qdict_get_try_str(options, "filename");
1764 warn_report("'filename' option specified. "
1765 "This is an unsupported option, and may be deprecated "
1767 iscsi_parse_filename(filename, options, &local_err);
1770 error_propagate(errp, local_err);
1775 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1776 qemu_opts_absorb_qdict(opts, options, &local_err);
1778 error_propagate(errp, local_err);
1783 transport_name = qemu_opt_get(opts, "transport");
1784 portal = qemu_opt_get(opts, "portal");
1785 target = qemu_opt_get(opts, "target");
1786 lun = qemu_opt_get_number(opts, "lun", 0);
1788 if (!transport_name || !portal || !target) {
1789 error_setg(errp, "Need all of transport, portal and target options");
1794 if (!strcmp(transport_name, "tcp")) {
1795 #if LIBISCSI_API_VERSION >= (20160603)
1796 transport = TCP_TRANSPORT;
1797 } else if (!strcmp(transport_name, "iser")) {
1798 transport = ISER_TRANSPORT;
1800 /* TCP is what older libiscsi versions always use */
1803 error_setg(errp, "Unknown transport: %s", transport_name);
1808 memset(iscsilun, 0, sizeof(IscsiLun));
1810 initiator_name = get_initiator_name(opts);
1812 iscsi = iscsi_create_context(initiator_name);
1813 if (iscsi == NULL) {
1814 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1818 #if LIBISCSI_API_VERSION >= (20160603)
1819 if (iscsi_init_transport(iscsi, transport)) {
1820 error_setg(errp, ("Error initializing transport."));
1825 if (iscsi_set_targetname(iscsi, target)) {
1826 error_setg(errp, "iSCSI: Failed to set target name.");
1831 /* check if we got CHAP username/password via the options */
1832 apply_chap(iscsi, opts, &local_err);
1833 if (local_err != NULL) {
1834 error_propagate(errp, local_err);
1839 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1840 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1845 /* check if we got HEADER_DIGEST via the options */
1846 apply_header_digest(iscsi, opts, &local_err);
1847 if (local_err != NULL) {
1848 error_propagate(errp, local_err);
1853 /* timeout handling is broken in libiscsi before 1.15.0 */
1854 timeout = qemu_opt_get_number(opts, "timeout", 0);
1855 #if LIBISCSI_API_VERSION >= 20150621
1856 iscsi_set_timeout(iscsi, timeout);
1859 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1863 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) {
1864 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1865 iscsi_get_error(iscsi));
1870 iscsilun->iscsi = iscsi;
1871 iscsilun->aio_context = bdrv_get_aio_context(bs);
1872 iscsilun->lun = lun;
1873 iscsilun->has_write_same = true;
1875 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1876 (void **) &inq, errp);
1881 iscsilun->type = inq->periperal_device_type;
1882 scsi_free_scsi_task(task);
1885 iscsi_modesense_sync(iscsilun);
1886 if (iscsilun->dpofua) {
1887 bs->supported_write_flags = BDRV_REQ_FUA;
1889 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
1891 /* Check the write protect flag of the LUN if we want to write */
1892 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1893 iscsilun->write_protected) {
1894 error_setg(errp, "Cannot open a write protected LUN as read-write");
1899 iscsi_readcapacity_sync(iscsilun, &local_err);
1900 if (local_err != NULL) {
1901 error_propagate(errp, local_err);
1905 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1907 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1908 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1909 * will try to read from the device to guess the image format.
1911 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1915 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1916 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1917 (void **) &inq_vpd, errp);
1922 for (i = 0; i < inq_vpd->num_pages; i++) {
1923 struct scsi_task *inq_task;
1924 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1925 struct scsi_inquiry_block_limits *inq_bl;
1926 switch (inq_vpd->pages[i]) {
1927 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1928 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1929 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1930 (void **) &inq_lbp, errp);
1931 if (inq_task == NULL) {
1935 memcpy(&iscsilun->lbp, inq_lbp,
1936 sizeof(struct scsi_inquiry_logical_block_provisioning));
1937 scsi_free_scsi_task(inq_task);
1939 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1940 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1941 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1942 (void **) &inq_bl, errp);
1943 if (inq_task == NULL) {
1947 memcpy(&iscsilun->bl, inq_bl,
1948 sizeof(struct scsi_inquiry_block_limits));
1949 scsi_free_scsi_task(inq_task);
1955 scsi_free_scsi_task(task);
1958 qemu_mutex_init(&iscsilun->mutex);
1959 iscsi_attach_aio_context(bs, iscsilun->aio_context);
1961 /* Guess the internal cluster (page) size of the iscsi target by the means
1962 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
1963 * reasonable size */
1964 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
1965 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
1966 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran *
1967 iscsilun->block_size) >> BDRV_SECTOR_BITS;
1968 if (iscsilun->lbprz) {
1969 ret = iscsi_allocmap_init(iscsilun, bs->open_flags);
1974 qemu_opts_del(opts);
1975 g_free(initiator_name);
1977 scsi_free_scsi_task(task);
1981 if (iscsi != NULL) {
1982 if (iscsi_is_logged_in(iscsi)) {
1983 iscsi_logout_sync(iscsi);
1985 iscsi_destroy_context(iscsi);
1987 memset(iscsilun, 0, sizeof(IscsiLun));
1993 static void iscsi_close(BlockDriverState *bs)
1995 IscsiLun *iscsilun = bs->opaque;
1996 struct iscsi_context *iscsi = iscsilun->iscsi;
1998 iscsi_detach_aio_context(bs);
1999 if (iscsi_is_logged_in(iscsi)) {
2000 iscsi_logout_sync(iscsi);
2002 iscsi_destroy_context(iscsi);
2003 g_free(iscsilun->zeroblock);
2004 iscsi_allocmap_free(iscsilun);
2005 qemu_mutex_destroy(&iscsilun->mutex);
2006 memset(iscsilun, 0, sizeof(IscsiLun));
2009 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
2011 /* We don't actually refresh here, but just return data queried in
2012 * iscsi_open(): iscsi targets don't change their limits. */
2014 IscsiLun *iscsilun = bs->opaque;
2015 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
2016 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
2018 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);
2020 bs->bl.request_alignment = block_size;
2022 if (iscsilun->bl.max_xfer_len) {
2023 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
2026 if (max_xfer_len * block_size < INT_MAX) {
2027 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
2030 if (iscsilun->lbp.lbpu) {
2031 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) {
2032 bs->bl.max_pdiscard =
2033 iscsilun->bl.max_unmap * iscsilun->block_size;
2035 bs->bl.pdiscard_alignment =
2036 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2038 bs->bl.pdiscard_alignment = iscsilun->block_size;
2041 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) {
2042 bs->bl.max_pwrite_zeroes =
2043 iscsilun->bl.max_ws_len * iscsilun->block_size;
2045 if (iscsilun->lbp.lbpws) {
2046 bs->bl.pwrite_zeroes_alignment =
2047 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2049 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
2051 if (iscsilun->bl.opt_xfer_len &&
2052 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
2053 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
2054 iscsilun->block_size);
2058 /* Note that this will not re-establish a connection with an iSCSI target - it
2059 * is effectively a NOP. */
2060 static int iscsi_reopen_prepare(BDRVReopenState *state,
2061 BlockReopenQueue *queue, Error **errp)
2063 IscsiLun *iscsilun = state->bs->opaque;
2065 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
2066 error_setg(errp, "Cannot open a write protected LUN as read-write");
2072 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
2074 IscsiLun *iscsilun = reopen_state->bs->opaque;
2076 /* the cache.direct status might have changed */
2077 if (iscsilun->allocmap != NULL) {
2078 iscsi_allocmap_init(iscsilun, reopen_state->flags);
2082 static int iscsi_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
2084 IscsiLun *iscsilun = bs->opaque;
2085 Error *local_err = NULL;
2087 if (iscsilun->type != TYPE_DISK) {
2088 error_setg(errp, "Cannot resize non-disk iSCSI devices");
2092 iscsi_readcapacity_sync(iscsilun, &local_err);
2093 if (local_err != NULL) {
2094 error_propagate(errp, local_err);
2098 if (offset > iscsi_getlength(bs)) {
2099 error_setg(errp, "Cannot grow iSCSI devices");
2103 if (iscsilun->allocmap != NULL) {
2104 iscsi_allocmap_init(iscsilun, bs->open_flags);
2110 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp)
2113 int64_t total_size = 0;
2114 BlockDriverState *bs;
2115 IscsiLun *iscsilun = NULL;
2117 Error *local_err = NULL;
2121 /* Read out options */
2122 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
2124 bs->opaque = g_new0(struct IscsiLun, 1);
2125 iscsilun = bs->opaque;
2127 bs_options = qdict_new();
2128 iscsi_parse_filename(filename, bs_options, &local_err);
2130 error_propagate(errp, local_err);
2133 ret = iscsi_open(bs, bs_options, 0, NULL);
2135 QDECREF(bs_options);
2140 iscsi_detach_aio_context(bs);
2141 if (iscsilun->type != TYPE_DISK) {
2145 if (bs->total_sectors < total_size) {
2152 if (iscsilun->iscsi != NULL) {
2153 iscsi_destroy_context(iscsilun->iscsi);
2161 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2163 IscsiLun *iscsilun = bs->opaque;
2164 bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
2165 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
2166 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE;
2170 static void iscsi_invalidate_cache(BlockDriverState *bs,
2173 IscsiLun *iscsilun = bs->opaque;
2174 iscsi_allocmap_invalidate(iscsilun);
2177 static QemuOptsList iscsi_create_opts = {
2178 .name = "iscsi-create-opts",
2179 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
2182 .name = BLOCK_OPT_SIZE,
2183 .type = QEMU_OPT_SIZE,
2184 .help = "Virtual disk size"
2186 { /* end of list */ }
2190 static BlockDriver bdrv_iscsi = {
2191 .format_name = "iscsi",
2192 .protocol_name = "iscsi",
2194 .instance_size = sizeof(IscsiLun),
2195 .bdrv_parse_filename = iscsi_parse_filename,
2196 .bdrv_file_open = iscsi_open,
2197 .bdrv_close = iscsi_close,
2198 .bdrv_create = iscsi_create,
2199 .create_opts = &iscsi_create_opts,
2200 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2201 .bdrv_reopen_commit = iscsi_reopen_commit,
2202 .bdrv_invalidate_cache = iscsi_invalidate_cache,
2204 .bdrv_getlength = iscsi_getlength,
2205 .bdrv_get_info = iscsi_get_info,
2206 .bdrv_truncate = iscsi_truncate,
2207 .bdrv_refresh_limits = iscsi_refresh_limits,
2209 .bdrv_co_get_block_status = iscsi_co_get_block_status,
2210 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2211 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2212 .bdrv_co_readv = iscsi_co_readv,
2213 .bdrv_co_writev_flags = iscsi_co_writev_flags,
2214 .bdrv_co_flush_to_disk = iscsi_co_flush,
2217 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2220 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2221 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2224 #if LIBISCSI_API_VERSION >= (20160603)
2225 static BlockDriver bdrv_iser = {
2226 .format_name = "iser",
2227 .protocol_name = "iser",
2229 .instance_size = sizeof(IscsiLun),
2230 .bdrv_parse_filename = iscsi_parse_filename,
2231 .bdrv_file_open = iscsi_open,
2232 .bdrv_close = iscsi_close,
2233 .bdrv_create = iscsi_create,
2234 .create_opts = &iscsi_create_opts,
2235 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2236 .bdrv_reopen_commit = iscsi_reopen_commit,
2237 .bdrv_invalidate_cache = iscsi_invalidate_cache,
2239 .bdrv_getlength = iscsi_getlength,
2240 .bdrv_get_info = iscsi_get_info,
2241 .bdrv_truncate = iscsi_truncate,
2242 .bdrv_refresh_limits = iscsi_refresh_limits,
2244 .bdrv_co_get_block_status = iscsi_co_get_block_status,
2245 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2246 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2247 .bdrv_co_readv = iscsi_co_readv,
2248 .bdrv_co_writev_flags = iscsi_co_writev_flags,
2249 .bdrv_co_flush_to_disk = iscsi_co_flush,
2252 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2255 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2256 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2260 static void iscsi_block_init(void)
2262 bdrv_register(&bdrv_iscsi);
2263 #if LIBISCSI_API_VERSION >= (20160603)
2264 bdrv_register(&bdrv_iser);
2268 block_init(iscsi_block_init);