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1 /*
2 * QEMU Block driver for iSCSI images
3 *
4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
5 * Copyright (c) 2012-2017 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 "system/system.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-io.h"
37 #include "block/block_int.h"
38 #include "block/qdict.h"
39 #include "scsi/constants.h"
40 #include "qemu/iov.h"
41 #include "qemu/module.h"
42 #include "qemu/option.h"
43 #include "qemu/uuid.h"
44 #include "system/replay.h"
45 #include "qapi/error.h"
46 #include "qapi/qapi-commands-machine.h"
47 #include "qobject/qdict.h"
48 #include "qobject/qstring.h"
49 #include "crypto/secret.h"
50 #include "scsi/utils.h"
51 #include "trace.h"
52
53 /* Conflict between scsi/utils.h and libiscsi! :( */
54 #define SCSI_XFER_NONE ISCSI_XFER_NONE
55 #include <iscsi/iscsi.h>
56 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */
57 #include <iscsi/scsi-lowlevel.h>
58 #undef inline
59 #undef SCSI_XFER_NONE
60 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE);
61
62 #ifdef __linux__
63 #include <scsi/sg.h>
64 #endif
65
66 typedef struct IscsiLun {
67 struct iscsi_context *iscsi;
68 AioContext *aio_context;
69 int lun;
70 enum scsi_inquiry_peripheral_device_type type;
71 int block_size;
72 uint64_t num_blocks;
73 int events;
74 QEMUTimer *nop_timer;
75 QEMUTimer *event_timer;
76 QemuMutex mutex;
77 struct scsi_inquiry_logical_block_provisioning lbp;
78 struct scsi_inquiry_block_limits bl;
79 struct scsi_inquiry_device_designator *dd;
80 unsigned char *zeroblock;
81 /* The allocmap tracks which clusters (pages) on the iSCSI target are
82 * allocated and which are not. In case a target returns zeros for
83 * unallocated pages (iscsilun->lprz) we can directly return zeros instead
84 * of reading zeros over the wire if a read request falls within an
85 * unallocated block. As there are 3 possible states we need 2 bitmaps to
86 * track. allocmap_valid keeps track if QEMU's information about a page is
87 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no
88 * valid information about a page the corresponding allocmap entry should be
89 * switched to unallocated as well to force a new lookup of the allocation
90 * status as lookups are generally skipped if a page is suspect to be
91 * allocated. If a iSCSI target is opened with cache.direct = on the
92 * allocmap_valid does not exist turning all cached information invalid so
93 * that a fresh lookup is made for any page even if allocmap entry returns
94 * it's unallocated. */
95 unsigned long *allocmap;
96 unsigned long *allocmap_valid;
97 long allocmap_size;
98 int cluster_size;
99 bool use_16_for_rw;
100 bool write_protected;
101 bool lbpme;
102 bool lbprz;
103 bool dpofua;
104 bool has_write_same;
105 bool request_timed_out;
106 } IscsiLun;
107
108 typedef struct IscsiTask {
109 int status;
110 int retries;
111 int do_retry;
112 struct scsi_task *task;
113 Coroutine *co;
114 IscsiLun *iscsilun;
115 QEMUTimer retry_timer;
116 int err_code;
117 char *err_str;
118 } IscsiTask;
119
120 typedef struct IscsiAIOCB {
121 BlockAIOCB common;
122 AioContext *ctx;
123 QEMUBH *bh;
124 IscsiLun *iscsilun;
125 struct scsi_task *task;
126 int status;
127 int64_t sector_num;
128 int nb_sectors;
129 int ret;
130 #ifdef __linux__
131 sg_io_hdr_t *ioh;
132 #endif
133 bool cancelled;
134 } IscsiAIOCB;
135
136 /* libiscsi uses time_t so its enough to process events every second */
137 #define EVENT_INTERVAL 1000
138 #define NOP_INTERVAL 5000
139 #define MAX_NOP_FAILURES 3
140 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
141 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
142
143 /* this threshold is a trade-off knob to choose between
144 * the potential additional overhead of an extra GET_LBA_STATUS request
145 * vs. unnecessarily reading a lot of zero sectors over the wire.
146 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
147 * sectors we check the allocation status of the area covered by the
148 * request first if the allocationmap indicates that the area might be
149 * unallocated. */
150 #define ISCSI_CHECKALLOC_THRES 64
151
152 #ifdef __linux__
153
154 static void
155 iscsi_bh_cb(void *p)
156 {
157 IscsiAIOCB *acb = p;
158
159 qemu_bh_delete(acb->bh);
160
161 acb->common.cb(acb->common.opaque, acb->status);
162
163 if (acb->task != NULL) {
164 scsi_free_scsi_task(acb->task);
165 acb->task = NULL;
166 }
167
168 qemu_aio_unref(acb);
169 }
170
171 static void
172 iscsi_schedule_bh(IscsiAIOCB *acb)
173 {
174 if (acb->bh) {
175 return;
176 }
177 acb->bh = aio_bh_new(acb->ctx, iscsi_bh_cb, acb);
178 qemu_bh_schedule(acb->bh);
179 }
180
181 #endif
182
183 static void iscsi_retry_timer_expired(void *opaque)
184 {
185 struct IscsiTask *iTask = opaque;
186 aio_co_wake(iTask->co);
187 }
188
189 static inline unsigned exp_random(double mean)
190 {
191 return -mean * log((double)rand() / RAND_MAX);
192 }
193
194 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
195 * libiscsi 1.10.0, together with other constants we need. Use it as
196 * a hint that we have to define them ourselves if needed, to keep the
197 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
198 * the test because SCSI_STATUS_* is an enum.
199 *
200 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
201 * an enum, check against the LIBISCSI_API_VERSION macro, which was
202 * introduced in 1.11.0. If it is present, there is no need to define
203 * anything.
204 */
205 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
206 !defined(LIBISCSI_API_VERSION)
207 #define SCSI_STATUS_TASK_SET_FULL 0x28
208 #define SCSI_STATUS_TIMEOUT 0x0f000002
209 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
210 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
211 #endif
212
213 #ifndef LIBISCSI_API_VERSION
214 #define LIBISCSI_API_VERSION 20130701
215 #endif
216
217 static int iscsi_translate_sense(struct scsi_sense *sense)
218 {
219 return scsi_sense_to_errno(sense->key,
220 (sense->ascq & 0xFF00) >> 8,
221 sense->ascq & 0xFF);
222 }
223
224 /* Called (via iscsi_service) with QemuMutex held. */
225 static void
226 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
227 void *command_data, void *opaque)
228 {
229 struct IscsiTask *iTask = opaque;
230 struct scsi_task *task = command_data;
231 IscsiLun *iscsilun = iTask->iscsilun;
232 AioContext *itask_ctx = qemu_coroutine_get_aio_context(iTask->co);
233
234 iTask->status = status;
235 iTask->do_retry = 0;
236 iTask->err_code = 0;
237 iTask->task = task;
238
239 if (status != SCSI_STATUS_GOOD) {
240 iTask->err_code = -EIO;
241 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
242 if (status == SCSI_STATUS_BUSY ||
243 status == SCSI_STATUS_TIMEOUT ||
244 status == SCSI_STATUS_TASK_SET_FULL) {
245 unsigned retry_time =
246 exp_random(iscsi_retry_times[iTask->retries - 1]);
247 if (status == SCSI_STATUS_TIMEOUT) {
248 /* make sure the request is rescheduled AFTER the
249 * reconnect is initiated */
250 retry_time = EVENT_INTERVAL * 2;
251 iTask->iscsilun->request_timed_out = true;
252 }
253 error_report("iSCSI Busy/TaskSetFull/TimeOut"
254 " (retry #%u in %u ms): %s",
255 iTask->retries, retry_time,
256 iscsi_get_error(iscsi));
257 aio_timer_init(itask_ctx, &iTask->retry_timer,
258 QEMU_CLOCK_REALTIME, SCALE_MS,
259 iscsi_retry_timer_expired, iTask);
260 timer_mod(&iTask->retry_timer,
261 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
262 iTask->do_retry = 1;
263 return;
264 } else if (status == SCSI_STATUS_CHECK_CONDITION) {
265 int error = iscsi_translate_sense(&task->sense);
266 if (error == EAGAIN) {
267 error_report("iSCSI CheckCondition: %s",
268 iscsi_get_error(iscsi));
269 iTask->do_retry = 1;
270 } else {
271 iTask->err_code = -error;
272 iTask->err_str = g_strdup(iscsi_get_error(iscsi));
273 }
274 }
275 }
276 }
277
278 /*
279 * aio_co_wake() is safe to call: iscsi_service(), which called us, is only
280 * run from the event_timer and/or the FD handlers, never from the request
281 * coroutine. The request coroutine in turn will yield unconditionally.
282 * We must release the lock, though, in case we enter the coroutine
283 * directly. (Note that if do we enter the coroutine, iTask will probably
284 * be dangling once aio_co_wake() returns.)
285 */
286 qemu_mutex_unlock(&iscsilun->mutex);
287 aio_co_wake(iTask->co);
288 qemu_mutex_lock(&iscsilun->mutex);
289 }
290
291 static void coroutine_fn
292 iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
293 {
294 *iTask = (struct IscsiTask) {
295 .co = qemu_coroutine_self(),
296 .iscsilun = iscsilun,
297 };
298 }
299
300 #ifdef __linux__
301
302 /* Called (via iscsi_service) with QemuMutex held. */
303 static void
304 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
305 void *private_data)
306 {
307 IscsiAIOCB *acb = private_data;
308
309 /* If the command callback hasn't been called yet, drop the task */
310 if (!acb->bh) {
311 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */
312 iscsi_scsi_cancel_task(iscsi, acb->task);
313 }
314
315 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */
316 }
317
318 static void
319 iscsi_aio_cancel(BlockAIOCB *blockacb)
320 {
321 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
322 IscsiLun *iscsilun = acb->iscsilun;
323
324 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
325
326 /* If it was cancelled or completed already, our work is done here */
327 if (acb->cancelled || acb->status != -EINPROGRESS) {
328 return;
329 }
330
331 acb->cancelled = true;
332
333 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */
334
335 /* send a task mgmt call to the target to cancel the task on the target */
336 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
337 iscsi_abort_task_cb, acb) < 0) {
338 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */
339 }
340 }
341 }
342
343 static const AIOCBInfo iscsi_aiocb_info = {
344 .aiocb_size = sizeof(IscsiAIOCB),
345 .cancel_async = iscsi_aio_cancel,
346 };
347
348 #endif
349
350 static void iscsi_process_read(void *arg);
351 static void iscsi_process_write(void *arg);
352
353 /* Called with QemuMutex held. */
354 static void
355 iscsi_set_events(IscsiLun *iscsilun)
356 {
357 struct iscsi_context *iscsi = iscsilun->iscsi;
358 int ev = iscsi_which_events(iscsi);
359
360 if (ev != iscsilun->events) {
361 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
362 (ev & POLLIN) ? iscsi_process_read : NULL,
363 (ev & POLLOUT) ? iscsi_process_write : NULL,
364 NULL, NULL,
365 iscsilun);
366 iscsilun->events = ev;
367 }
368 }
369
370 static void iscsi_timed_check_events(void *opaque)
371 {
372 IscsiLun *iscsilun = opaque;
373
374 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
375 /* check for timed out requests */
376 iscsi_service(iscsilun->iscsi, 0);
377
378 if (iscsilun->request_timed_out) {
379 iscsilun->request_timed_out = false;
380 iscsi_reconnect(iscsilun->iscsi);
381 }
382
383 /*
384 * newer versions of libiscsi may return zero events. Ensure we are
385 * able to return to service once this situation changes.
386 */
387 iscsi_set_events(iscsilun);
388 }
389
390 timer_mod(iscsilun->event_timer,
391 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
392 }
393
394 static void
395 iscsi_process_read(void *arg)
396 {
397 IscsiLun *iscsilun = arg;
398 struct iscsi_context *iscsi = iscsilun->iscsi;
399
400 qemu_mutex_lock(&iscsilun->mutex);
401 iscsi_service(iscsi, POLLIN);
402 iscsi_set_events(iscsilun);
403 qemu_mutex_unlock(&iscsilun->mutex);
404 }
405
406 static void
407 iscsi_process_write(void *arg)
408 {
409 IscsiLun *iscsilun = arg;
410 struct iscsi_context *iscsi = iscsilun->iscsi;
411
412 qemu_mutex_lock(&iscsilun->mutex);
413 iscsi_service(iscsi, POLLOUT);
414 iscsi_set_events(iscsilun);
415 qemu_mutex_unlock(&iscsilun->mutex);
416 }
417
418 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
419 {
420 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
421 }
422
423 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
424 {
425 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
426 }
427
428 static bool is_byte_request_lun_aligned(int64_t offset, int64_t bytes,
429 IscsiLun *iscsilun)
430 {
431 if (offset % iscsilun->block_size || bytes % iscsilun->block_size) {
432 error_report("iSCSI misaligned request: "
433 "iscsilun->block_size %u, offset %" PRIi64
434 ", bytes %" PRIi64,
435 iscsilun->block_size, offset, bytes);
436 return false;
437 }
438 return true;
439 }
440
441 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
442 IscsiLun *iscsilun)
443 {
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,
447 iscsilun);
448 }
449
450 static void iscsi_allocmap_free(IscsiLun *iscsilun)
451 {
452 g_free(iscsilun->allocmap);
453 g_free(iscsilun->allocmap_valid);
454 iscsilun->allocmap = NULL;
455 iscsilun->allocmap_valid = NULL;
456 }
457
458
459 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
460 {
461 iscsi_allocmap_free(iscsilun);
462
463 assert(iscsilun->cluster_size);
464 iscsilun->allocmap_size =
465 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size,
466 iscsilun->cluster_size);
467
468 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
469 if (!iscsilun->allocmap) {
470 return -ENOMEM;
471 }
472
473 if (open_flags & BDRV_O_NOCACHE) {
474 /* when cache.direct = on all allocmap entries are
475 * treated as invalid to force a relookup of the block
476 * status on every read request */
477 return 0;
478 }
479
480 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size);
481 if (!iscsilun->allocmap_valid) {
482 /* if we are under memory pressure free the allocmap as well */
483 iscsi_allocmap_free(iscsilun);
484 return -ENOMEM;
485 }
486
487 return 0;
488 }
489
490 static void
491 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset,
492 int64_t bytes, bool allocated, bool valid)
493 {
494 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
495
496 if (iscsilun->allocmap == NULL) {
497 return;
498 }
499 /* expand to entirely contain all affected clusters */
500 assert(iscsilun->cluster_size);
501 cl_num_expanded = offset / iscsilun->cluster_size;
502 nb_cls_expanded = DIV_ROUND_UP(offset + bytes,
503 iscsilun->cluster_size) - cl_num_expanded;
504 /* shrink to touch only completely contained clusters */
505 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size);
506 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk;
507 if (allocated) {
508 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
509 } else {
510 if (nb_cls_shrunk > 0) {
511 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk);
512 }
513 }
514
515 if (iscsilun->allocmap_valid == NULL) {
516 return;
517 }
518 if (valid) {
519 if (nb_cls_shrunk > 0) {
520 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk);
521 }
522 } else {
523 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded,
524 nb_cls_expanded);
525 }
526 }
527
528 static void
529 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset,
530 int64_t bytes)
531 {
532 iscsi_allocmap_update(iscsilun, offset, bytes, true, true);
533 }
534
535 static void
536 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset,
537 int64_t bytes)
538 {
539 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
540 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
541 */
542 iscsi_allocmap_update(iscsilun, offset, bytes, false, true);
543 }
544
545 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset,
546 int64_t bytes)
547 {
548 iscsi_allocmap_update(iscsilun, offset, bytes, false, false);
549 }
550
551 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
552 {
553 if (iscsilun->allocmap) {
554 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size);
555 }
556 if (iscsilun->allocmap_valid) {
557 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size);
558 }
559 }
560
561 static inline bool
562 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset,
563 int64_t bytes)
564 {
565 unsigned long size;
566 if (iscsilun->allocmap == NULL) {
567 return true;
568 }
569 assert(iscsilun->cluster_size);
570 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
571 return !(find_next_bit(iscsilun->allocmap, size,
572 offset / iscsilun->cluster_size) == size);
573 }
574
575 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
576 int64_t offset, int64_t bytes)
577 {
578 unsigned long size;
579 if (iscsilun->allocmap_valid == NULL) {
580 return false;
581 }
582 assert(iscsilun->cluster_size);
583 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
584 return (find_next_zero_bit(iscsilun->allocmap_valid, size,
585 offset / iscsilun->cluster_size) == size);
586 }
587
588 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask,
589 IscsiLun *iscsilun)
590 {
591 iscsi_set_events(iscsilun);
592 qemu_mutex_unlock(&iscsilun->mutex);
593 qemu_coroutine_yield();
594 qemu_mutex_lock(&iscsilun->mutex);
595 }
596
597 static int coroutine_fn
598 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
599 QEMUIOVector *iov, int flags)
600 {
601 IscsiLun *iscsilun = bs->opaque;
602 struct IscsiTask iTask;
603 uint64_t lba;
604 uint32_t num_sectors;
605 bool fua = flags & BDRV_REQ_FUA;
606 int r = 0;
607
608 if (fua) {
609 assert(iscsilun->dpofua);
610 }
611 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
612 return -EINVAL;
613 }
614
615 if (bs->bl.max_transfer) {
616 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
617 }
618
619 lba = sector_qemu2lun(sector_num, iscsilun);
620 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
621 iscsi_co_init_iscsitask(iscsilun, &iTask);
622 qemu_mutex_lock(&iscsilun->mutex);
623 retry:
624 if (iscsilun->use_16_for_rw) {
625 #if LIBISCSI_API_VERSION >= (20160603)
626 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
627 NULL, num_sectors * iscsilun->block_size,
628 iscsilun->block_size, 0, 0, fua, 0, 0,
629 iscsi_co_generic_cb, &iTask,
630 (struct scsi_iovec *)iov->iov, iov->niov);
631 } else {
632 iTask.task = iscsi_write10_iov_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,
636 (struct scsi_iovec *)iov->iov, iov->niov);
637 }
638 #else
639 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
640 NULL, num_sectors * iscsilun->block_size,
641 iscsilun->block_size, 0, 0, fua, 0, 0,
642 iscsi_co_generic_cb, &iTask);
643 } else {
644 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
645 NULL, num_sectors * iscsilun->block_size,
646 iscsilun->block_size, 0, 0, fua, 0, 0,
647 iscsi_co_generic_cb, &iTask);
648 }
649 #endif
650 if (iTask.task == NULL) {
651 qemu_mutex_unlock(&iscsilun->mutex);
652 return -ENOMEM;
653 }
654 #if LIBISCSI_API_VERSION < (20160603)
655 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
656 iov->niov);
657 #endif
658 iscsi_co_wait_for_task(&iTask, iscsilun);
659
660 if (iTask.task != NULL) {
661 scsi_free_scsi_task(iTask.task);
662 iTask.task = NULL;
663 }
664
665 if (iTask.do_retry) {
666 goto retry;
667 }
668
669 if (iTask.status != SCSI_STATUS_GOOD) {
670 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
671 nb_sectors * BDRV_SECTOR_SIZE);
672 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba,
673 iTask.err_str);
674 r = iTask.err_code;
675 goto out_unlock;
676 }
677
678 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
679 nb_sectors * BDRV_SECTOR_SIZE);
680
681 out_unlock:
682 qemu_mutex_unlock(&iscsilun->mutex);
683 g_free(iTask.err_str);
684 return r;
685 }
686
687
688
689 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs,
690 unsigned int mode,
691 int64_t offset, int64_t bytes,
692 int64_t *pnum, int64_t *map,
693 BlockDriverState **file)
694 {
695 IscsiLun *iscsilun = bs->opaque;
696 struct scsi_get_lba_status *lbas = NULL;
697 struct scsi_lba_status_descriptor *lbasd = NULL;
698 struct IscsiTask iTask;
699 uint64_t lba, max_bytes;
700 int ret;
701
702 iscsi_co_init_iscsitask(iscsilun, &iTask);
703
704 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size));
705
706 /* default to all sectors allocated */
707 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
708 if (map) {
709 *map = offset;
710 }
711 *pnum = bytes;
712
713 /* LUN does not support logical block provisioning */
714 if (!iscsilun->lbpme) {
715 goto out;
716 }
717
718 lba = offset / iscsilun->block_size;
719 max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size;
720
721 qemu_mutex_lock(&iscsilun->mutex);
722 retry:
723 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
724 lba, 8 + 16, iscsi_co_generic_cb,
725 &iTask) == NULL) {
726 ret = -ENOMEM;
727 goto out_unlock;
728 }
729 iscsi_co_wait_for_task(&iTask, iscsilun);
730
731 if (iTask.do_retry) {
732 if (iTask.task != NULL) {
733 scsi_free_scsi_task(iTask.task);
734 iTask.task = NULL;
735 }
736 goto retry;
737 }
738
739 if (iTask.status != SCSI_STATUS_GOOD) {
740 /* in case the get_lba_status_callout fails (i.e.
741 * because the device is busy or the cmd is not
742 * supported) we pretend all blocks are allocated
743 * for backwards compatibility */
744 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s",
745 lba, iTask.err_str);
746 goto out_unlock;
747 }
748
749 lbas = scsi_datain_unmarshall(iTask.task);
750 if (lbas == NULL || lbas->num_descriptors == 0) {
751 ret = -EIO;
752 goto out_unlock;
753 }
754
755 lbasd = &lbas->descriptors[0];
756
757 if (lba != lbasd->lba) {
758 ret = -EIO;
759 goto out_unlock;
760 }
761
762 *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes);
763
764 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
765 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
766 ret &= ~BDRV_BLOCK_DATA;
767 if (iscsilun->lbprz) {
768 ret |= BDRV_BLOCK_ZERO;
769 }
770 }
771
772 if (ret & BDRV_BLOCK_ZERO) {
773 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum);
774 } else {
775 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum);
776 }
777
778 out_unlock:
779 qemu_mutex_unlock(&iscsilun->mutex);
780 g_free(iTask.err_str);
781 out:
782 if (iTask.task != NULL) {
783 scsi_free_scsi_task(iTask.task);
784 }
785 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) {
786 *file = bs;
787 }
788 return ret;
789 }
790
791 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
792 int64_t sector_num, int nb_sectors,
793 QEMUIOVector *iov)
794 {
795 IscsiLun *iscsilun = bs->opaque;
796 struct IscsiTask iTask;
797 uint64_t lba;
798 uint32_t num_sectors;
799 int r = 0;
800
801 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
802 return -EINVAL;
803 }
804
805 if (bs->bl.max_transfer) {
806 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
807 }
808
809 /* if cache.direct is off and we have a valid entry in our allocation map
810 * we can skip checking the block status and directly return zeroes if
811 * the request falls within an unallocated area */
812 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
813 nb_sectors * BDRV_SECTOR_SIZE) &&
814 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
815 nb_sectors * BDRV_SECTOR_SIZE)) {
816 qemu_iovec_memset(iov, 0, 0x00, iov->size);
817 return 0;
818 }
819
820 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
821 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
822 nb_sectors * BDRV_SECTOR_SIZE) &&
823 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
824 nb_sectors * BDRV_SECTOR_SIZE)) {
825 int64_t pnum;
826 /* check the block status from the beginning of the cluster
827 * containing the start sector */
828 int64_t head;
829 int ret;
830
831 assert(iscsilun->cluster_size);
832 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size;
833 ret = iscsi_co_block_status(bs, true,
834 sector_num * BDRV_SECTOR_SIZE - head,
835 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL);
836 if (ret < 0) {
837 return ret;
838 }
839 /* if the whole request falls into an unallocated area we can avoid
840 * reading and directly return zeroes instead */
841 if (ret & BDRV_BLOCK_ZERO &&
842 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) {
843 qemu_iovec_memset(iov, 0, 0x00, iov->size);
844 return 0;
845 }
846 }
847
848 lba = sector_qemu2lun(sector_num, iscsilun);
849 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
850
851 iscsi_co_init_iscsitask(iscsilun, &iTask);
852 qemu_mutex_lock(&iscsilun->mutex);
853 retry:
854 if (iscsilun->use_16_for_rw) {
855 #if LIBISCSI_API_VERSION >= (20160603)
856 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
857 num_sectors * iscsilun->block_size,
858 iscsilun->block_size, 0, 0, 0, 0, 0,
859 iscsi_co_generic_cb, &iTask,
860 (struct scsi_iovec *)iov->iov, iov->niov);
861 } else {
862 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
863 num_sectors * iscsilun->block_size,
864 iscsilun->block_size,
865 0, 0, 0, 0, 0,
866 iscsi_co_generic_cb, &iTask,
867 (struct scsi_iovec *)iov->iov, iov->niov);
868 }
869 #else
870 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
871 num_sectors * iscsilun->block_size,
872 iscsilun->block_size, 0, 0, 0, 0, 0,
873 iscsi_co_generic_cb, &iTask);
874 } else {
875 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
876 num_sectors * iscsilun->block_size,
877 iscsilun->block_size,
878 0, 0, 0, 0, 0,
879 iscsi_co_generic_cb, &iTask);
880 }
881 #endif
882 if (iTask.task == NULL) {
883 qemu_mutex_unlock(&iscsilun->mutex);
884 return -ENOMEM;
885 }
886 #if LIBISCSI_API_VERSION < (20160603)
887 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
888 #endif
889
890 iscsi_co_wait_for_task(&iTask, iscsilun);
891 if (iTask.task != NULL) {
892 scsi_free_scsi_task(iTask.task);
893 iTask.task = NULL;
894 }
895
896 if (iTask.do_retry) {
897 goto retry;
898 }
899
900 if (iTask.status != SCSI_STATUS_GOOD) {
901 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s",
902 lba, iTask.err_str);
903 r = iTask.err_code;
904 }
905
906 qemu_mutex_unlock(&iscsilun->mutex);
907 g_free(iTask.err_str);
908 return r;
909 }
910
911 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
912 {
913 IscsiLun *iscsilun = bs->opaque;
914 struct IscsiTask iTask;
915 int r = 0;
916
917 iscsi_co_init_iscsitask(iscsilun, &iTask);
918 qemu_mutex_lock(&iscsilun->mutex);
919 retry:
920 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
921 0, iscsi_co_generic_cb, &iTask) == NULL) {
922 qemu_mutex_unlock(&iscsilun->mutex);
923 return -ENOMEM;
924 }
925
926 iscsi_co_wait_for_task(&iTask, iscsilun);
927
928 if (iTask.task != NULL) {
929 scsi_free_scsi_task(iTask.task);
930 iTask.task = NULL;
931 }
932
933 if (iTask.do_retry) {
934 goto retry;
935 }
936
937 if (iTask.status != SCSI_STATUS_GOOD) {
938 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str);
939 r = iTask.err_code;
940 }
941
942 qemu_mutex_unlock(&iscsilun->mutex);
943 g_free(iTask.err_str);
944 return r;
945 }
946
947 #ifdef __linux__
948 /* Called (via iscsi_service) with QemuMutex held. */
949 static void
950 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
951 void *command_data, void *opaque)
952 {
953 IscsiAIOCB *acb = opaque;
954
955 if (status == SCSI_STATUS_CANCELLED) {
956 if (!acb->bh) {
957 acb->status = -ECANCELED;
958 iscsi_schedule_bh(acb);
959 }
960 return;
961 }
962
963 acb->status = 0;
964 if (status < 0) {
965 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
966 iscsi_get_error(iscsi));
967 acb->status = -iscsi_translate_sense(&acb->task->sense);
968 }
969
970 acb->ioh->driver_status = 0;
971 acb->ioh->host_status = 0;
972 acb->ioh->resid = 0;
973 acb->ioh->status = status;
974
975 #define SG_ERR_DRIVER_SENSE 0x08
976
977 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
978 int ss;
979
980 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
981
982 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
983 ss = MIN(acb->ioh->mx_sb_len, acb->ioh->sb_len_wr);
984 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
985 }
986
987 iscsi_schedule_bh(acb);
988 }
989
990 static void iscsi_ioctl_bh_completion(void *opaque)
991 {
992 IscsiAIOCB *acb = opaque;
993
994 qemu_bh_delete(acb->bh);
995 acb->common.cb(acb->common.opaque, acb->ret);
996 qemu_aio_unref(acb);
997 }
998
999 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
1000 {
1001 BlockDriverState *bs = acb->common.bs;
1002 IscsiLun *iscsilun = bs->opaque;
1003 int ret = 0;
1004
1005 switch (req) {
1006 case SG_GET_VERSION_NUM:
1007 *(int *)buf = 30000;
1008 break;
1009 case SG_GET_SCSI_ID:
1010 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
1011 break;
1012 default:
1013 ret = -EINVAL;
1014 }
1015 assert(!acb->bh);
1016 acb->bh = aio_bh_new(acb->ctx, iscsi_ioctl_bh_completion, acb);
1017 acb->ret = ret;
1018 qemu_bh_schedule(acb->bh);
1019 }
1020
1021 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
1022 unsigned long int req, void *buf,
1023 BlockCompletionFunc *cb, void *opaque)
1024 {
1025 IscsiLun *iscsilun = bs->opaque;
1026 struct iscsi_context *iscsi = iscsilun->iscsi;
1027 struct iscsi_data data;
1028 IscsiAIOCB *acb;
1029
1030 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
1031
1032 acb->iscsilun = iscsilun;
1033 acb->ctx = qemu_get_current_aio_context();
1034 acb->bh = NULL;
1035 acb->status = -EINPROGRESS;
1036 acb->ioh = buf;
1037 acb->cancelled = false;
1038
1039 if (req != SG_IO) {
1040 iscsi_ioctl_handle_emulated(acb, req, buf);
1041 return &acb->common;
1042 }
1043
1044 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
1045 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
1046 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
1047 qemu_aio_unref(acb);
1048 return NULL;
1049 }
1050
1051 /* Must use malloc(): this is freed via scsi_free_scsi_task() */
1052 acb->task = malloc(sizeof(struct scsi_task));
1053 if (acb->task == NULL) {
1054 error_report("iSCSI: Failed to allocate task for scsi command. %s",
1055 iscsi_get_error(iscsi));
1056 qemu_aio_unref(acb);
1057 return NULL;
1058 }
1059 memset(acb->task, 0, sizeof(struct scsi_task));
1060
1061 switch (acb->ioh->dxfer_direction) {
1062 case SG_DXFER_TO_DEV:
1063 acb->task->xfer_dir = SCSI_XFER_WRITE;
1064 break;
1065 case SG_DXFER_FROM_DEV:
1066 acb->task->xfer_dir = SCSI_XFER_READ;
1067 break;
1068 default:
1069 acb->task->xfer_dir = SCSI_XFER_NONE;
1070 break;
1071 }
1072
1073 acb->task->cdb_size = acb->ioh->cmd_len;
1074 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
1075 acb->task->expxferlen = acb->ioh->dxfer_len;
1076
1077 data.size = 0;
1078 qemu_mutex_lock(&iscsilun->mutex);
1079 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
1080 if (acb->ioh->iovec_count == 0) {
1081 data.data = acb->ioh->dxferp;
1082 data.size = acb->ioh->dxfer_len;
1083 } else {
1084 scsi_task_set_iov_out(acb->task,
1085 (struct scsi_iovec *) acb->ioh->dxferp,
1086 acb->ioh->iovec_count);
1087 }
1088 }
1089
1090 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1091 iscsi_aio_ioctl_cb,
1092 (data.size > 0) ? &data : NULL,
1093 acb) != 0) {
1094 qemu_mutex_unlock(&iscsilun->mutex);
1095 scsi_free_scsi_task(acb->task);
1096 qemu_aio_unref(acb);
1097 return NULL;
1098 }
1099
1100 /* tell libiscsi to read straight into the buffer we got from ioctl */
1101 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1102 if (acb->ioh->iovec_count == 0) {
1103 scsi_task_add_data_in_buffer(acb->task,
1104 acb->ioh->dxfer_len,
1105 acb->ioh->dxferp);
1106 } else {
1107 scsi_task_set_iov_in(acb->task,
1108 (struct scsi_iovec *) acb->ioh->dxferp,
1109 acb->ioh->iovec_count);
1110 }
1111 }
1112
1113 iscsi_set_events(iscsilun);
1114 qemu_mutex_unlock(&iscsilun->mutex);
1115
1116 return &acb->common;
1117 }
1118
1119 #endif
1120
1121 static int64_t coroutine_fn
1122 iscsi_co_getlength(BlockDriverState *bs)
1123 {
1124 IscsiLun *iscsilun = bs->opaque;
1125 int64_t len;
1126
1127 len = iscsilun->num_blocks;
1128 len *= iscsilun->block_size;
1129
1130 return len;
1131 }
1132
1133 static int
1134 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset,
1135 int64_t bytes)
1136 {
1137 IscsiLun *iscsilun = bs->opaque;
1138 struct IscsiTask iTask;
1139 struct unmap_list list;
1140 int r = 0;
1141
1142 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1143 return -ENOTSUP;
1144 }
1145
1146 if (!iscsilun->lbp.lbpu) {
1147 /* UNMAP is not supported by the target */
1148 return 0;
1149 }
1150
1151 /*
1152 * We don't want to overflow list.num which is uint32_t.
1153 * We rely on our max_pdiscard.
1154 */
1155 assert(bytes / iscsilun->block_size <= UINT32_MAX);
1156
1157 list.lba = offset / iscsilun->block_size;
1158 list.num = bytes / iscsilun->block_size;
1159
1160 iscsi_co_init_iscsitask(iscsilun, &iTask);
1161 qemu_mutex_lock(&iscsilun->mutex);
1162 retry:
1163 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1164 iscsi_co_generic_cb, &iTask) == NULL) {
1165 r = -ENOMEM;
1166 goto out_unlock;
1167 }
1168
1169 iscsi_co_wait_for_task(&iTask, iscsilun);
1170
1171 if (iTask.task != NULL) {
1172 scsi_free_scsi_task(iTask.task);
1173 iTask.task = NULL;
1174 }
1175
1176 if (iTask.do_retry) {
1177 goto retry;
1178 }
1179
1180 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1181
1182 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1183 /* the target might fail with a check condition if it
1184 is not happy with the alignment of the UNMAP request
1185 we silently fail in this case */
1186 goto out_unlock;
1187 }
1188
1189 if (iTask.status != SCSI_STATUS_GOOD) {
1190 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s",
1191 list.lba, iTask.err_str);
1192 r = iTask.err_code;
1193 goto out_unlock;
1194 }
1195
1196 out_unlock:
1197 qemu_mutex_unlock(&iscsilun->mutex);
1198 g_free(iTask.err_str);
1199 return r;
1200 }
1201
1202 static int
1203 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1204 int64_t bytes, BdrvRequestFlags flags)
1205 {
1206 IscsiLun *iscsilun = bs->opaque;
1207 struct IscsiTask iTask;
1208 uint64_t lba;
1209 uint64_t nb_blocks;
1210 bool use_16_for_ws = iscsilun->use_16_for_rw;
1211 int r = 0;
1212
1213 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1214 return -ENOTSUP;
1215 }
1216
1217 if (flags & BDRV_REQ_MAY_UNMAP) {
1218 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1219 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1220 use_16_for_ws = true;
1221 }
1222 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1223 /* WRITESAME16 with UNMAP is not supported by the target,
1224 * fall back and try WRITESAME10/16 without UNMAP */
1225 flags &= ~BDRV_REQ_MAY_UNMAP;
1226 use_16_for_ws = iscsilun->use_16_for_rw;
1227 }
1228 }
1229
1230 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1231 /* WRITESAME without UNMAP is not supported by the target */
1232 return -ENOTSUP;
1233 }
1234
1235 lba = offset / iscsilun->block_size;
1236 nb_blocks = bytes / iscsilun->block_size;
1237
1238 if (iscsilun->zeroblock == NULL) {
1239 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1240 if (iscsilun->zeroblock == NULL) {
1241 return -ENOMEM;
1242 }
1243 }
1244
1245 qemu_mutex_lock(&iscsilun->mutex);
1246 iscsi_co_init_iscsitask(iscsilun, &iTask);
1247 retry:
1248 if (use_16_for_ws) {
1249 /*
1250 * iscsi_writesame16_task num_blocks argument is uint32_t. We rely here
1251 * on our max_pwrite_zeroes limit.
1252 */
1253 assert(nb_blocks <= UINT32_MAX);
1254 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1255 iscsilun->zeroblock, iscsilun->block_size,
1256 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1257 0, 0, iscsi_co_generic_cb, &iTask);
1258 } else {
1259 /*
1260 * iscsi_writesame10_task num_blocks argument is uint16_t. We rely here
1261 * on our max_pwrite_zeroes limit.
1262 */
1263 assert(nb_blocks <= UINT16_MAX);
1264 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1265 iscsilun->zeroblock, iscsilun->block_size,
1266 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1267 0, 0, iscsi_co_generic_cb, &iTask);
1268 }
1269 if (iTask.task == NULL) {
1270 qemu_mutex_unlock(&iscsilun->mutex);
1271 return -ENOMEM;
1272 }
1273
1274 iscsi_co_wait_for_task(&iTask, iscsilun);
1275
1276 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1277 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1278 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1279 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1280 /* WRITE SAME is not supported by the target */
1281 iscsilun->has_write_same = false;
1282 scsi_free_scsi_task(iTask.task);
1283 r = -ENOTSUP;
1284 goto out_unlock;
1285 }
1286
1287 if (iTask.task != NULL) {
1288 scsi_free_scsi_task(iTask.task);
1289 iTask.task = NULL;
1290 }
1291
1292 if (iTask.do_retry) {
1293 goto retry;
1294 }
1295
1296 if (iTask.status != SCSI_STATUS_GOOD) {
1297 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1298 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s",
1299 lba, iTask.err_str);
1300 r = iTask.err_code;
1301 goto out_unlock;
1302 }
1303
1304 if (flags & BDRV_REQ_MAY_UNMAP) {
1305 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1306 } else {
1307 iscsi_allocmap_set_allocated(iscsilun, offset, bytes);
1308 }
1309
1310 out_unlock:
1311 qemu_mutex_unlock(&iscsilun->mutex);
1312 g_free(iTask.err_str);
1313 return r;
1314 }
1315
1316 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
1317 Error **errp)
1318 {
1319 const char *user = NULL;
1320 const char *password = NULL;
1321 const char *secretid;
1322 char *secret = NULL;
1323
1324 user = qemu_opt_get(opts, "user");
1325 if (!user) {
1326 return;
1327 }
1328
1329 secretid = qemu_opt_get(opts, "password-secret");
1330 password = qemu_opt_get(opts, "password");
1331 if (secretid && password) {
1332 error_setg(errp, "'password' and 'password-secret' properties are "
1333 "mutually exclusive");
1334 return;
1335 }
1336 if (secretid) {
1337 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1338 if (!secret) {
1339 return;
1340 }
1341 password = secret;
1342 } else if (!password) {
1343 error_setg(errp, "CHAP username specified but no password was given");
1344 return;
1345 } else {
1346 warn_report("iSCSI block driver 'password' option is deprecated, "
1347 "use 'password-secret' instead");
1348 }
1349
1350 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1351 error_setg(errp, "Failed to set initiator username and password");
1352 }
1353
1354 g_free(secret);
1355 }
1356
1357 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts,
1358 Error **errp)
1359 {
1360 const char *digest = NULL;
1361
1362 digest = qemu_opt_get(opts, "header-digest");
1363 if (!digest) {
1364 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1365 } else if (!strcmp(digest, "crc32c")) {
1366 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1367 } else if (!strcmp(digest, "none")) {
1368 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1369 } else if (!strcmp(digest, "crc32c-none")) {
1370 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1371 } else if (!strcmp(digest, "none-crc32c")) {
1372 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1373 } else {
1374 error_setg(errp, "Invalid header-digest setting : %s", digest);
1375 }
1376 }
1377
1378 static char *get_initiator_name(QemuOpts *opts)
1379 {
1380 const char *name;
1381 char *iscsi_name;
1382 UuidInfo *uuid_info;
1383
1384 name = qemu_opt_get(opts, "initiator-name");
1385 if (name) {
1386 return g_strdup(name);
1387 }
1388
1389 uuid_info = qmp_query_uuid(NULL);
1390 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1391 name = qemu_get_vm_name();
1392 } else {
1393 name = uuid_info->UUID;
1394 }
1395 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1396 name ? ":" : "", name ? name : "");
1397 qapi_free_UuidInfo(uuid_info);
1398 return iscsi_name;
1399 }
1400
1401 static void iscsi_nop_timed_event(void *opaque)
1402 {
1403 IscsiLun *iscsilun = opaque;
1404
1405 QEMU_LOCK_GUARD(&iscsilun->mutex);
1406 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1407 error_report("iSCSI: NOP timeout. Reconnecting...");
1408 iscsilun->request_timed_out = true;
1409 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1410 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1411 return;
1412 }
1413
1414 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1415 iscsi_set_events(iscsilun);
1416 }
1417
1418 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1419 {
1420 struct scsi_task *task = NULL;
1421 struct scsi_readcapacity10 *rc10 = NULL;
1422 struct scsi_readcapacity16 *rc16 = NULL;
1423 int retries = ISCSI_CMD_RETRIES;
1424
1425 do {
1426 if (task != NULL) {
1427 scsi_free_scsi_task(task);
1428 task = NULL;
1429 }
1430
1431 switch (iscsilun->type) {
1432 case TYPE_DISK:
1433 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1434 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1435 rc16 = scsi_datain_unmarshall(task);
1436 if (rc16 == NULL) {
1437 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1438 } else {
1439 iscsilun->block_size = rc16->block_length;
1440 iscsilun->num_blocks = rc16->returned_lba + 1;
1441 iscsilun->lbpme = !!rc16->lbpme;
1442 iscsilun->lbprz = !!rc16->lbprz;
1443 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1444 }
1445 break;
1446 }
1447 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1448 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1449 break;
1450 }
1451 /* Fall through and try READ CAPACITY(10) instead. */
1452 case TYPE_ROM:
1453 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1454 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1455 rc10 = scsi_datain_unmarshall(task);
1456 if (rc10 == NULL) {
1457 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1458 } else {
1459 iscsilun->block_size = rc10->block_size;
1460 if (rc10->lba == 0) {
1461 /* blank disk loaded */
1462 iscsilun->num_blocks = 0;
1463 } else {
1464 iscsilun->num_blocks = rc10->lba + 1;
1465 }
1466 }
1467 }
1468 break;
1469 default:
1470 return;
1471 }
1472 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1473 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1474 && retries-- > 0);
1475
1476 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1477 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1478 } else if (!iscsilun->block_size ||
1479 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1480 error_setg(errp, "iSCSI: the target returned an invalid "
1481 "block size of %d.", iscsilun->block_size);
1482 }
1483 if (task) {
1484 scsi_free_scsi_task(task);
1485 }
1486 }
1487
1488 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1489 int evpd, int pc, void **inq, Error **errp)
1490 {
1491 int full_size;
1492 struct scsi_task *task = NULL;
1493 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1494 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1495 goto fail;
1496 }
1497 full_size = scsi_datain_getfullsize(task);
1498 if (full_size > task->datain.size) {
1499 scsi_free_scsi_task(task);
1500
1501 /* we need more data for the full list */
1502 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1503 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1504 goto fail;
1505 }
1506 }
1507
1508 *inq = scsi_datain_unmarshall(task);
1509 if (*inq == NULL) {
1510 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1511 goto fail_with_err;
1512 }
1513
1514 return task;
1515
1516 fail:
1517 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1518 iscsi_get_error(iscsi));
1519 fail_with_err:
1520 if (task != NULL) {
1521 scsi_free_scsi_task(task);
1522 }
1523 return NULL;
1524 }
1525
1526 static void iscsi_detach_aio_context(BlockDriverState *bs)
1527 {
1528 IscsiLun *iscsilun = bs->opaque;
1529
1530 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1531 NULL, NULL, NULL, NULL, NULL);
1532 iscsilun->events = 0;
1533
1534 if (iscsilun->nop_timer) {
1535 timer_free(iscsilun->nop_timer);
1536 iscsilun->nop_timer = NULL;
1537 }
1538 if (iscsilun->event_timer) {
1539 timer_free(iscsilun->event_timer);
1540 iscsilun->event_timer = NULL;
1541 }
1542 }
1543
1544 static void iscsi_attach_aio_context(BlockDriverState *bs,
1545 AioContext *new_context)
1546 {
1547 IscsiLun *iscsilun = bs->opaque;
1548
1549 iscsilun->aio_context = new_context;
1550 iscsi_set_events(iscsilun);
1551
1552 /* Set up a timer for sending out iSCSI NOPs */
1553 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1554 QEMU_CLOCK_REALTIME, SCALE_MS,
1555 iscsi_nop_timed_event, iscsilun);
1556 timer_mod(iscsilun->nop_timer,
1557 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1558
1559 /* Set up a timer for periodic calls to iscsi_set_events and to
1560 * scan for command timeout */
1561 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1562 QEMU_CLOCK_REALTIME, SCALE_MS,
1563 iscsi_timed_check_events, iscsilun);
1564 timer_mod(iscsilun->event_timer,
1565 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1566 }
1567
1568 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1569 {
1570 struct scsi_task *task;
1571 struct scsi_mode_sense *ms = NULL;
1572 iscsilun->write_protected = false;
1573 iscsilun->dpofua = false;
1574
1575 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1576 1, SCSI_MODESENSE_PC_CURRENT,
1577 0x3F, 0, 255);
1578 if (task == NULL) {
1579 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1580 iscsi_get_error(iscsilun->iscsi));
1581 goto out;
1582 }
1583
1584 if (task->status != SCSI_STATUS_GOOD) {
1585 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1586 goto out;
1587 }
1588 ms = scsi_datain_unmarshall(task);
1589 if (!ms) {
1590 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1591 iscsi_get_error(iscsilun->iscsi));
1592 goto out;
1593 }
1594 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1595 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1596
1597 out:
1598 if (task) {
1599 scsi_free_scsi_task(task);
1600 }
1601 }
1602
1603 static void iscsi_parse_iscsi_option(const char *target, QDict *options)
1604 {
1605 QemuOptsList *list;
1606 QemuOpts *opts;
1607 const char *user, *password, *password_secret, *initiator_name,
1608 *header_digest, *timeout;
1609
1610 list = qemu_find_opts("iscsi");
1611 if (!list) {
1612 return;
1613 }
1614
1615 opts = qemu_opts_find(list, target);
1616 if (opts == NULL) {
1617 opts = QTAILQ_FIRST(&list->head);
1618 if (!opts) {
1619 return;
1620 }
1621 }
1622
1623 user = qemu_opt_get(opts, "user");
1624 if (user) {
1625 qdict_set_default_str(options, "user", user);
1626 }
1627
1628 password = qemu_opt_get(opts, "password");
1629 if (password) {
1630 qdict_set_default_str(options, "password", password);
1631 }
1632
1633 password_secret = qemu_opt_get(opts, "password-secret");
1634 if (password_secret) {
1635 qdict_set_default_str(options, "password-secret", password_secret);
1636 }
1637
1638 initiator_name = qemu_opt_get(opts, "initiator-name");
1639 if (initiator_name) {
1640 qdict_set_default_str(options, "initiator-name", initiator_name);
1641 }
1642
1643 header_digest = qemu_opt_get(opts, "header-digest");
1644 if (header_digest) {
1645 /* -iscsi takes upper case values, but QAPI only supports lower case
1646 * enum constant names, so we have to convert here. */
1647 char *qapi_value = g_ascii_strdown(header_digest, -1);
1648 qdict_set_default_str(options, "header-digest", qapi_value);
1649 g_free(qapi_value);
1650 }
1651
1652 timeout = qemu_opt_get(opts, "timeout");
1653 if (timeout) {
1654 qdict_set_default_str(options, "timeout", timeout);
1655 }
1656 }
1657
1658 /*
1659 * We support iscsi url's on the form
1660 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1661 */
1662 static void iscsi_parse_filename(const char *filename, QDict *options,
1663 Error **errp)
1664 {
1665 struct iscsi_url *iscsi_url;
1666 const char *transport_name;
1667 char *lun_str;
1668
1669 iscsi_url = iscsi_parse_full_url(NULL, filename);
1670 if (iscsi_url == NULL) {
1671 error_setg(errp, "Failed to parse URL : %s", filename);
1672 return;
1673 }
1674
1675 #if LIBISCSI_API_VERSION >= (20160603)
1676 switch (iscsi_url->transport) {
1677 case TCP_TRANSPORT:
1678 transport_name = "tcp";
1679 break;
1680 case ISER_TRANSPORT:
1681 transport_name = "iser";
1682 break;
1683 default:
1684 error_setg(errp, "Unknown transport type (%d)",
1685 iscsi_url->transport);
1686 return;
1687 }
1688 #else
1689 transport_name = "tcp";
1690 #endif
1691
1692 qdict_set_default_str(options, "transport", transport_name);
1693 qdict_set_default_str(options, "portal", iscsi_url->portal);
1694 qdict_set_default_str(options, "target", iscsi_url->target);
1695
1696 lun_str = g_strdup_printf("%d", iscsi_url->lun);
1697 qdict_set_default_str(options, "lun", lun_str);
1698 g_free(lun_str);
1699
1700 /* User/password from -iscsi take precedence over those from the URL */
1701 iscsi_parse_iscsi_option(iscsi_url->target, options);
1702
1703 if (iscsi_url->user[0] != '\0') {
1704 qdict_set_default_str(options, "user", iscsi_url->user);
1705 qdict_set_default_str(options, "password", iscsi_url->passwd);
1706 }
1707
1708 iscsi_destroy_url(iscsi_url);
1709 }
1710
1711 static QemuOptsList runtime_opts = {
1712 .name = "iscsi",
1713 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1714 .desc = {
1715 {
1716 .name = "transport",
1717 .type = QEMU_OPT_STRING,
1718 },
1719 {
1720 .name = "portal",
1721 .type = QEMU_OPT_STRING,
1722 },
1723 {
1724 .name = "target",
1725 .type = QEMU_OPT_STRING,
1726 },
1727 {
1728 .name = "user",
1729 .type = QEMU_OPT_STRING,
1730 },
1731 {
1732 .name = "password",
1733 .type = QEMU_OPT_STRING,
1734 },
1735 {
1736 .name = "password-secret",
1737 .type = QEMU_OPT_STRING,
1738 },
1739 {
1740 .name = "lun",
1741 .type = QEMU_OPT_NUMBER,
1742 },
1743 {
1744 .name = "initiator-name",
1745 .type = QEMU_OPT_STRING,
1746 },
1747 {
1748 .name = "header-digest",
1749 .type = QEMU_OPT_STRING,
1750 },
1751 {
1752 .name = "timeout",
1753 .type = QEMU_OPT_NUMBER,
1754 },
1755 { /* end of list */ }
1756 },
1757 };
1758
1759 static void iscsi_save_designator(IscsiLun *lun,
1760 struct scsi_inquiry_device_identification *inq_di)
1761 {
1762 struct scsi_inquiry_device_designator *desig, *copy = NULL;
1763
1764 for (desig = inq_di->designators; desig; desig = desig->next) {
1765 if (desig->association ||
1766 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) {
1767 continue;
1768 }
1769 /* NAA works better than T10 vendor ID based designator. */
1770 if (!copy || copy->designator_type < desig->designator_type) {
1771 copy = desig;
1772 }
1773 }
1774 if (copy) {
1775 lun->dd = g_new(struct scsi_inquiry_device_designator, 1);
1776 *lun->dd = *copy;
1777 lun->dd->next = NULL;
1778 lun->dd->designator = g_malloc(copy->designator_length);
1779 memcpy(lun->dd->designator, copy->designator, copy->designator_length);
1780 }
1781 }
1782
1783 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1784 Error **errp)
1785 {
1786 IscsiLun *iscsilun = bs->opaque;
1787 struct iscsi_context *iscsi = NULL;
1788 struct scsi_task *task = NULL;
1789 struct scsi_inquiry_standard *inq = NULL;
1790 struct scsi_inquiry_supported_pages *inq_vpd;
1791 char *initiator_name = NULL;
1792 QemuOpts *opts;
1793 Error *local_err = NULL;
1794 const char *transport_name, *portal, *target;
1795 #if LIBISCSI_API_VERSION >= (20160603)
1796 enum iscsi_transport_type transport;
1797 #endif
1798 int i, ret = 0, timeout = 0, lun;
1799
1800 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1801 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
1802 ret = -EINVAL;
1803 goto out;
1804 }
1805
1806 transport_name = qemu_opt_get(opts, "transport");
1807 portal = qemu_opt_get(opts, "portal");
1808 target = qemu_opt_get(opts, "target");
1809 lun = qemu_opt_get_number(opts, "lun", 0);
1810
1811 if (!transport_name || !portal || !target) {
1812 error_setg(errp, "Need all of transport, portal and target options");
1813 ret = -EINVAL;
1814 goto out;
1815 }
1816
1817 if (!strcmp(transport_name, "tcp")) {
1818 #if LIBISCSI_API_VERSION >= (20160603)
1819 transport = TCP_TRANSPORT;
1820 } else if (!strcmp(transport_name, "iser")) {
1821 transport = ISER_TRANSPORT;
1822 #else
1823 /* TCP is what older libiscsi versions always use */
1824 #endif
1825 } else {
1826 error_setg(errp, "Unknown transport: %s", transport_name);
1827 ret = -EINVAL;
1828 goto out;
1829 }
1830
1831 memset(iscsilun, 0, sizeof(IscsiLun));
1832
1833 initiator_name = get_initiator_name(opts);
1834
1835 iscsi = iscsi_create_context(initiator_name);
1836 if (iscsi == NULL) {
1837 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1838 ret = -ENOMEM;
1839 goto out;
1840 }
1841 #if LIBISCSI_API_VERSION >= (20160603)
1842 if (iscsi_init_transport(iscsi, transport)) {
1843 error_setg(errp, ("Error initializing transport."));
1844 ret = -EINVAL;
1845 goto out;
1846 }
1847 #endif
1848 if (iscsi_set_targetname(iscsi, target)) {
1849 error_setg(errp, "iSCSI: Failed to set target name.");
1850 ret = -EINVAL;
1851 goto out;
1852 }
1853
1854 /* check if we got CHAP username/password via the options */
1855 apply_chap(iscsi, opts, &local_err);
1856 if (local_err != NULL) {
1857 error_propagate(errp, local_err);
1858 ret = -EINVAL;
1859 goto out;
1860 }
1861
1862 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1863 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1864 ret = -EINVAL;
1865 goto out;
1866 }
1867
1868 /* check if we got HEADER_DIGEST via the options */
1869 apply_header_digest(iscsi, opts, &local_err);
1870 if (local_err != NULL) {
1871 error_propagate(errp, local_err);
1872 ret = -EINVAL;
1873 goto out;
1874 }
1875
1876 /* timeout handling is broken in libiscsi before 1.15.0 */
1877 timeout = qemu_opt_get_number(opts, "timeout", 0);
1878 #if LIBISCSI_API_VERSION >= 20150621
1879 iscsi_set_timeout(iscsi, timeout);
1880 #else
1881 if (timeout) {
1882 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1883 }
1884 #endif
1885
1886 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) {
1887 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1888 iscsi_get_error(iscsi));
1889 ret = -EINVAL;
1890 goto out;
1891 }
1892
1893 iscsilun->iscsi = iscsi;
1894 iscsilun->aio_context = bdrv_get_aio_context(bs);
1895 iscsilun->lun = lun;
1896 iscsilun->has_write_same = true;
1897
1898 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1899 (void **) &inq, errp);
1900 if (task == NULL) {
1901 ret = -EINVAL;
1902 goto out;
1903 }
1904 iscsilun->type = inq->periperal_device_type;
1905 scsi_free_scsi_task(task);
1906 task = NULL;
1907
1908 iscsi_modesense_sync(iscsilun);
1909 if (iscsilun->dpofua) {
1910 bs->supported_write_flags = BDRV_REQ_FUA;
1911 }
1912
1913 /* Check the write protect flag of the LUN if we want to write */
1914 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1915 iscsilun->write_protected) {
1916 bdrv_graph_rdlock_main_loop();
1917 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp);
1918 bdrv_graph_rdunlock_main_loop();
1919 if (ret < 0) {
1920 goto out;
1921 }
1922 flags &= ~BDRV_O_RDWR;
1923 }
1924
1925 iscsi_readcapacity_sync(iscsilun, &local_err);
1926 if (local_err != NULL) {
1927 error_propagate(errp, local_err);
1928 ret = -EINVAL;
1929 goto out;
1930 }
1931 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1932
1933 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1934 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1935 * will try to read from the device to guess the image format.
1936 */
1937 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1938 bs->sg = true;
1939 }
1940
1941 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1942 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1943 (void **) &inq_vpd, errp);
1944 if (task == NULL) {
1945 ret = -EINVAL;
1946 goto out;
1947 }
1948 for (i = 0; i < inq_vpd->num_pages; i++) {
1949 struct scsi_task *inq_task;
1950 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1951 struct scsi_inquiry_block_limits *inq_bl;
1952 struct scsi_inquiry_device_identification *inq_di;
1953 switch (inq_vpd->pages[i]) {
1954 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1955 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1956 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1957 (void **) &inq_lbp, errp);
1958 if (inq_task == NULL) {
1959 ret = -EINVAL;
1960 goto out;
1961 }
1962 memcpy(&iscsilun->lbp, inq_lbp,
1963 sizeof(struct scsi_inquiry_logical_block_provisioning));
1964 scsi_free_scsi_task(inq_task);
1965 break;
1966 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1967 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1968 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1969 (void **) &inq_bl, errp);
1970 if (inq_task == NULL) {
1971 ret = -EINVAL;
1972 goto out;
1973 }
1974 memcpy(&iscsilun->bl, inq_bl,
1975 sizeof(struct scsi_inquiry_block_limits));
1976 scsi_free_scsi_task(inq_task);
1977 break;
1978 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION:
1979 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1980 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION,
1981 (void **) &inq_di, errp);
1982 if (inq_task == NULL) {
1983 ret = -EINVAL;
1984 goto out;
1985 }
1986 iscsi_save_designator(iscsilun, inq_di);
1987 scsi_free_scsi_task(inq_task);
1988 break;
1989 default:
1990 break;
1991 }
1992 }
1993 scsi_free_scsi_task(task);
1994 task = NULL;
1995
1996 qemu_mutex_init(&iscsilun->mutex);
1997 iscsi_attach_aio_context(bs, iscsilun->aio_context);
1998
1999 /* Guess the internal cluster (page) size of the iscsi target by the means
2000 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
2001 * reasonable size */
2002 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
2003 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
2004 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
2005 iscsilun->block_size;
2006 if (iscsilun->lbprz) {
2007 ret = iscsi_allocmap_init(iscsilun, flags);
2008 }
2009 }
2010
2011 if (iscsilun->lbprz && iscsilun->lbp.lbpws) {
2012 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
2013 }
2014
2015 out:
2016 qemu_opts_del(opts);
2017 g_free(initiator_name);
2018 if (task != NULL) {
2019 scsi_free_scsi_task(task);
2020 }
2021
2022 if (ret) {
2023 if (iscsi != NULL) {
2024 if (iscsi_is_logged_in(iscsi)) {
2025 iscsi_logout_sync(iscsi);
2026 }
2027 iscsi_destroy_context(iscsi);
2028 }
2029 memset(iscsilun, 0, sizeof(IscsiLun));
2030 }
2031
2032 return ret;
2033 }
2034
2035 static void iscsi_close(BlockDriverState *bs)
2036 {
2037 IscsiLun *iscsilun = bs->opaque;
2038 struct iscsi_context *iscsi = iscsilun->iscsi;
2039
2040 iscsi_detach_aio_context(bs);
2041 if (iscsi_is_logged_in(iscsi)) {
2042 iscsi_logout_sync(iscsi);
2043 }
2044 iscsi_destroy_context(iscsi);
2045 if (iscsilun->dd) {
2046 g_free(iscsilun->dd->designator);
2047 g_free(iscsilun->dd);
2048 }
2049 g_free(iscsilun->zeroblock);
2050 iscsi_allocmap_free(iscsilun);
2051 qemu_mutex_destroy(&iscsilun->mutex);
2052 memset(iscsilun, 0, sizeof(IscsiLun));
2053 }
2054
2055 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
2056 {
2057 /* We don't actually refresh here, but just return data queried in
2058 * iscsi_open(): iscsi targets don't change their limits. */
2059
2060 IscsiLun *iscsilun = bs->opaque;
2061 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
2062 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
2063
2064 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bdrv_is_sg(bs));
2065
2066 bs->bl.request_alignment = block_size;
2067
2068 if (iscsilun->bl.max_xfer_len) {
2069 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
2070 }
2071
2072 if (max_xfer_len * block_size < INT_MAX) {
2073 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
2074 }
2075
2076 if (iscsilun->lbp.lbpu) {
2077 bs->bl.max_pdiscard =
2078 MIN_NON_ZERO(iscsilun->bl.max_unmap * iscsilun->block_size,
2079 (uint64_t)UINT32_MAX * iscsilun->block_size);
2080 bs->bl.pdiscard_alignment =
2081 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2082 } else {
2083 bs->bl.pdiscard_alignment = iscsilun->block_size;
2084 }
2085
2086 bs->bl.max_pwrite_zeroes =
2087 MIN_NON_ZERO(iscsilun->bl.max_ws_len * iscsilun->block_size,
2088 max_xfer_len * iscsilun->block_size);
2089
2090 if (iscsilun->lbp.lbpws) {
2091 bs->bl.pwrite_zeroes_alignment =
2092 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2093 } else {
2094 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
2095 }
2096 if (iscsilun->bl.opt_xfer_len &&
2097 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
2098 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
2099 iscsilun->block_size);
2100 }
2101 }
2102
2103 /* Note that this will not re-establish a connection with an iSCSI target - it
2104 * is effectively a NOP. */
2105 static int iscsi_reopen_prepare(BDRVReopenState *state,
2106 BlockReopenQueue *queue, Error **errp)
2107 {
2108 IscsiLun *iscsilun = state->bs->opaque;
2109
2110 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
2111 error_setg(errp, "Cannot open a write protected LUN as read-write");
2112 return -EACCES;
2113 }
2114 return 0;
2115 }
2116
2117 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
2118 {
2119 IscsiLun *iscsilun = reopen_state->bs->opaque;
2120
2121 /* the cache.direct status might have changed */
2122 if (iscsilun->allocmap != NULL) {
2123 iscsi_allocmap_init(iscsilun, reopen_state->flags);
2124 }
2125 }
2126
2127 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset,
2128 bool exact, PreallocMode prealloc,
2129 BdrvRequestFlags flags, Error **errp)
2130 {
2131 IscsiLun *iscsilun = bs->opaque;
2132 int64_t cur_length;
2133 Error *local_err = NULL;
2134
2135 if (prealloc != PREALLOC_MODE_OFF) {
2136 error_setg(errp, "Unsupported preallocation mode '%s'",
2137 PreallocMode_str(prealloc));
2138 return -ENOTSUP;
2139 }
2140
2141 if (iscsilun->type != TYPE_DISK) {
2142 error_setg(errp, "Cannot resize non-disk iSCSI devices");
2143 return -ENOTSUP;
2144 }
2145
2146 iscsi_readcapacity_sync(iscsilun, &local_err);
2147 if (local_err != NULL) {
2148 error_propagate(errp, local_err);
2149 return -EIO;
2150 }
2151
2152 cur_length = iscsi_co_getlength(bs);
2153 if (offset != cur_length && exact) {
2154 error_setg(errp, "Cannot resize iSCSI devices");
2155 return -ENOTSUP;
2156 } else if (offset > cur_length) {
2157 error_setg(errp, "Cannot grow iSCSI devices");
2158 return -EINVAL;
2159 }
2160
2161 if (iscsilun->allocmap != NULL) {
2162 iscsi_allocmap_init(iscsilun, bs->open_flags);
2163 }
2164
2165 return 0;
2166 }
2167
2168 static int coroutine_fn
2169 iscsi_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2170 {
2171 IscsiLun *iscsilun = bs->opaque;
2172 bdi->cluster_size = iscsilun->cluster_size;
2173 return 0;
2174 }
2175
2176 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs,
2177 Error **errp)
2178 {
2179 IscsiLun *iscsilun = bs->opaque;
2180 iscsi_allocmap_invalidate(iscsilun);
2181 }
2182
2183 static int coroutine_fn GRAPH_RDLOCK
2184 iscsi_co_copy_range_from(BlockDriverState *bs,
2185 BdrvChild *src, int64_t src_offset,
2186 BdrvChild *dst, int64_t dst_offset,
2187 int64_t bytes, BdrvRequestFlags read_flags,
2188 BdrvRequestFlags write_flags)
2189 {
2190 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes,
2191 read_flags, write_flags);
2192 }
2193
2194 static struct scsi_task *iscsi_xcopy_task(int param_len)
2195 {
2196 struct scsi_task *task;
2197
2198 task = g_new0(struct scsi_task, 1);
2199
2200 task->cdb[0] = EXTENDED_COPY;
2201 task->cdb[10] = (param_len >> 24) & 0xFF;
2202 task->cdb[11] = (param_len >> 16) & 0xFF;
2203 task->cdb[12] = (param_len >> 8) & 0xFF;
2204 task->cdb[13] = param_len & 0xFF;
2205 task->cdb_size = 16;
2206 task->xfer_dir = SCSI_XFER_WRITE;
2207 task->expxferlen = param_len;
2208
2209 return task;
2210 }
2211
2212 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
2213 {
2214 struct scsi_inquiry_device_designator *dd = lun->dd;
2215
2216 memset(desc, 0, 32);
2217 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */
2218 desc[4] = dd->code_set;
2219 desc[5] = (dd->designator_type & 0xF)
2220 | ((dd->association & 3) << 4);
2221 desc[7] = dd->designator_length;
2222 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20));
2223
2224 desc[28] = 0;
2225 desc[29] = (lun->block_size >> 16) & 0xFF;
2226 desc[30] = (lun->block_size >> 8) & 0xFF;
2227 desc[31] = lun->block_size & 0xFF;
2228 }
2229
2230 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index,
2231 int dst_index)
2232 {
2233 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */
2234 hdr[1] = ((dc << 1) | cat) & 0xFF;
2235 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF;
2236 /* don't account for the first 4 bytes in descriptor header*/
2237 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF;
2238 hdr[4] = (src_index >> 8) & 0xFF;
2239 hdr[5] = src_index & 0xFF;
2240 hdr[6] = (dst_index >> 8) & 0xFF;
2241 hdr[7] = dst_index & 0xFF;
2242 }
2243
2244 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat,
2245 int src_index, int dst_index, int num_blks,
2246 uint64_t src_lba, uint64_t dst_lba)
2247 {
2248 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index);
2249
2250 /* The caller should verify the request size */
2251 assert(num_blks < 65536);
2252 desc[10] = (num_blks >> 8) & 0xFF;
2253 desc[11] = num_blks & 0xFF;
2254 desc[12] = (src_lba >> 56) & 0xFF;
2255 desc[13] = (src_lba >> 48) & 0xFF;
2256 desc[14] = (src_lba >> 40) & 0xFF;
2257 desc[15] = (src_lba >> 32) & 0xFF;
2258 desc[16] = (src_lba >> 24) & 0xFF;
2259 desc[17] = (src_lba >> 16) & 0xFF;
2260 desc[18] = (src_lba >> 8) & 0xFF;
2261 desc[19] = src_lba & 0xFF;
2262 desc[20] = (dst_lba >> 56) & 0xFF;
2263 desc[21] = (dst_lba >> 48) & 0xFF;
2264 desc[22] = (dst_lba >> 40) & 0xFF;
2265 desc[23] = (dst_lba >> 32) & 0xFF;
2266 desc[24] = (dst_lba >> 24) & 0xFF;
2267 desc[25] = (dst_lba >> 16) & 0xFF;
2268 desc[26] = (dst_lba >> 8) & 0xFF;
2269 desc[27] = dst_lba & 0xFF;
2270 }
2271
2272 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str,
2273 int list_id_usage, int prio,
2274 int tgt_desc_len,
2275 int seg_desc_len, int inline_data_len)
2276 {
2277 buf[0] = list_id;
2278 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7);
2279 buf[2] = (tgt_desc_len >> 8) & 0xFF;
2280 buf[3] = tgt_desc_len & 0xFF;
2281 buf[8] = (seg_desc_len >> 24) & 0xFF;
2282 buf[9] = (seg_desc_len >> 16) & 0xFF;
2283 buf[10] = (seg_desc_len >> 8) & 0xFF;
2284 buf[11] = seg_desc_len & 0xFF;
2285 buf[12] = (inline_data_len >> 24) & 0xFF;
2286 buf[13] = (inline_data_len >> 16) & 0xFF;
2287 buf[14] = (inline_data_len >> 8) & 0xFF;
2288 buf[15] = inline_data_len & 0xFF;
2289 }
2290
2291 static void iscsi_xcopy_data(struct iscsi_data *data,
2292 IscsiLun *src, int64_t src_lba,
2293 IscsiLun *dst, int64_t dst_lba,
2294 uint16_t num_blocks)
2295 {
2296 uint8_t *buf;
2297 const int src_offset = XCOPY_DESC_OFFSET;
2298 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE;
2299 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE;
2300
2301 data->size = XCOPY_DESC_OFFSET +
2302 IDENT_DESCR_TGT_DESCR_SIZE * 2 +
2303 XCOPY_BLK2BLK_SEG_DESC_SIZE;
2304 data->data = g_malloc0(data->size);
2305 buf = data->data;
2306
2307 /* Initialise the parameter list header */
2308 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */,
2309 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE,
2310 XCOPY_BLK2BLK_SEG_DESC_SIZE,
2311 0);
2312
2313 /* Initialise CSCD list with one src + one dst descriptor */
2314 iscsi_populate_target_desc(&buf[src_offset], src);
2315 iscsi_populate_target_desc(&buf[dst_offset], dst);
2316
2317 /* Initialise one segment descriptor */
2318 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks,
2319 src_lba, dst_lba);
2320 }
2321
2322 static int coroutine_fn GRAPH_RDLOCK
2323 iscsi_co_copy_range_to(BlockDriverState *bs,
2324 BdrvChild *src, int64_t src_offset,
2325 BdrvChild *dst, int64_t dst_offset,
2326 int64_t bytes, BdrvRequestFlags read_flags,
2327 BdrvRequestFlags write_flags)
2328 {
2329 IscsiLun *dst_lun = dst->bs->opaque;
2330 IscsiLun *src_lun;
2331 struct IscsiTask iscsi_task;
2332 struct iscsi_data data;
2333 int r = 0;
2334 int block_size;
2335
2336 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) {
2337 return -ENOTSUP;
2338 }
2339 src_lun = src->bs->opaque;
2340
2341 if (!src_lun->dd || !dst_lun->dd) {
2342 return -ENOTSUP;
2343 }
2344 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) {
2345 return -ENOTSUP;
2346 }
2347 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) {
2348 return -ENOTSUP;
2349 }
2350 if (dst_lun->block_size != src_lun->block_size ||
2351 !dst_lun->block_size) {
2352 return -ENOTSUP;
2353 }
2354
2355 block_size = dst_lun->block_size;
2356 if (bytes / block_size > 65535) {
2357 return -ENOTSUP;
2358 }
2359
2360 iscsi_xcopy_data(&data,
2361 src_lun, src_offset / block_size,
2362 dst_lun, dst_offset / block_size,
2363 bytes / block_size);
2364
2365 iscsi_co_init_iscsitask(dst_lun, &iscsi_task);
2366
2367 qemu_mutex_lock(&dst_lun->mutex);
2368 iscsi_task.task = iscsi_xcopy_task(data.size);
2369 retry:
2370 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun,
2371 iscsi_task.task, iscsi_co_generic_cb,
2372 &data,
2373 &iscsi_task) != 0) {
2374 r = -EIO;
2375 goto out_unlock;
2376 }
2377
2378 iscsi_co_wait_for_task(&iscsi_task, dst_lun);
2379
2380 if (iscsi_task.do_retry) {
2381 goto retry;
2382 }
2383
2384 if (iscsi_task.status != SCSI_STATUS_GOOD) {
2385 r = iscsi_task.err_code;
2386 goto out_unlock;
2387 }
2388
2389 out_unlock:
2390
2391 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r);
2392 g_free(iscsi_task.task);
2393 qemu_mutex_unlock(&dst_lun->mutex);
2394 g_free(iscsi_task.err_str);
2395 return r;
2396 }
2397
2398
2399 static const char *const iscsi_strong_runtime_opts[] = {
2400 "transport",
2401 "portal",
2402 "target",
2403 "user",
2404 "password",
2405 "password-secret",
2406 "lun",
2407 "initiator-name",
2408 "header-digest",
2409
2410 NULL
2411 };
2412
2413 static BlockDriver bdrv_iscsi = {
2414 .format_name = "iscsi",
2415 .protocol_name = "iscsi",
2416
2417 .instance_size = sizeof(IscsiLun),
2418 .bdrv_parse_filename = iscsi_parse_filename,
2419 .bdrv_open = iscsi_open,
2420 .bdrv_close = iscsi_close,
2421 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2422 .create_opts = &bdrv_create_opts_simple,
2423 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2424 .bdrv_reopen_commit = iscsi_reopen_commit,
2425 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2426
2427 .bdrv_co_getlength = iscsi_co_getlength,
2428 .bdrv_co_get_info = iscsi_co_get_info,
2429 .bdrv_co_truncate = iscsi_co_truncate,
2430 .bdrv_refresh_limits = iscsi_refresh_limits,
2431
2432 .bdrv_co_block_status = iscsi_co_block_status,
2433 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2434 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2435 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2436 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2437 .bdrv_co_readv = iscsi_co_readv,
2438 .bdrv_co_writev = iscsi_co_writev,
2439 .bdrv_co_flush_to_disk = iscsi_co_flush,
2440
2441 #ifdef __linux__
2442 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2443 #endif
2444
2445 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2446 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2447
2448 .strong_runtime_opts = iscsi_strong_runtime_opts,
2449 };
2450
2451 #if LIBISCSI_API_VERSION >= (20160603)
2452 static BlockDriver bdrv_iser = {
2453 .format_name = "iser",
2454 .protocol_name = "iser",
2455
2456 .instance_size = sizeof(IscsiLun),
2457 .bdrv_parse_filename = iscsi_parse_filename,
2458 .bdrv_open = iscsi_open,
2459 .bdrv_close = iscsi_close,
2460 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2461 .create_opts = &bdrv_create_opts_simple,
2462 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2463 .bdrv_reopen_commit = iscsi_reopen_commit,
2464 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2465
2466 .bdrv_co_getlength = iscsi_co_getlength,
2467 .bdrv_co_get_info = iscsi_co_get_info,
2468 .bdrv_co_truncate = iscsi_co_truncate,
2469 .bdrv_refresh_limits = iscsi_refresh_limits,
2470
2471 .bdrv_co_block_status = iscsi_co_block_status,
2472 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2473 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2474 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2475 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2476 .bdrv_co_readv = iscsi_co_readv,
2477 .bdrv_co_writev = iscsi_co_writev,
2478 .bdrv_co_flush_to_disk = iscsi_co_flush,
2479
2480 #ifdef __linux__
2481 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2482 #endif
2483
2484 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2485 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2486
2487 .strong_runtime_opts = iscsi_strong_runtime_opts,
2488 };
2489 #endif
2490
2491 static void iscsi_block_init(void)
2492 {
2493 bdrv_register(&bdrv_iscsi);
2494 #if LIBISCSI_API_VERSION >= (20160603)
2495 bdrv_register(&bdrv_iser);
2496 #endif
2497 }
2498
2499 block_init(iscsi_block_init);