?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ui: update keycodemapdb submodule commit
[qemu/armbru.git] / block / iscsi.c
blob4d2a416ce7712d6faa031a40d29edb11187cb45f
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 "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/qdict.h"
38 #include "scsi/constants.h"
39 #include "qemu/iov.h"
40 #include "qemu/module.h"
41 #include "qemu/option.h"
42 #include "qemu/uuid.h"
43 #include "sysemu/replay.h"
44 #include "qapi/error.h"
45 #include "qapi/qapi-commands-machine.h"
46 #include "qapi/qmp/qdict.h"
47 #include "qapi/qmp/qstring.h"
48 #include "crypto/secret.h"
49 #include "scsi/utils.h"
50 #include "trace.h"
51
52 /* Conflict between scsi/utils.h and libiscsi! :( */
53 #define SCSI_XFER_NONE ISCSI_XFER_NONE
54 #include <iscsi/iscsi.h>
55 #define inline __attribute__((gnu_inline)) /* required for libiscsi v1.9.0 */
56 #include <iscsi/scsi-lowlevel.h>
57 #undef inline
58 #undef SCSI_XFER_NONE
59 QEMU_BUILD_BUG_ON((int)SCSI_XFER_NONE != (int)ISCSI_XFER_NONE);
60
61 #ifdef __linux__
62 #include <scsi/sg.h>
63 #endif
64
65 typedef struct IscsiLun {
66 struct iscsi_context *iscsi;
67 AioContext *aio_context;
68 int lun;
69 enum scsi_inquiry_peripheral_device_type type;
70 int block_size;
71 uint64_t num_blocks;
72 int events;
73 QEMUTimer *nop_timer;
74 QEMUTimer *event_timer;
75 QemuMutex mutex;
76 struct scsi_inquiry_logical_block_provisioning lbp;
77 struct scsi_inquiry_block_limits bl;
78 struct scsi_inquiry_device_designator *dd;
79 unsigned char *zeroblock;
80 /* The allocmap tracks which clusters (pages) on the iSCSI target are
81 * allocated and which are not. In case a target returns zeros for
82 * unallocated pages (iscsilun->lprz) we can directly return zeros instead
83 * of reading zeros over the wire if a read request falls within an
84 * unallocated block. As there are 3 possible states we need 2 bitmaps to
85 * track. allocmap_valid keeps track if QEMU's information about a page is
86 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no
87 * valid information about a page the corresponding allocmap entry should be
88 * switched to unallocated as well to force a new lookup of the allocation
89 * status as lookups are generally skipped if a page is suspect to be
90 * allocated. If a iSCSI target is opened with cache.direct = on the
91 * allocmap_valid does not exist turning all cached information invalid so
92 * that a fresh lookup is made for any page even if allocmap entry returns
93 * it's unallocated. */
94 unsigned long *allocmap;
95 unsigned long *allocmap_valid;
96 long allocmap_size;
97 int cluster_size;
98 bool use_16_for_rw;
99 bool write_protected;
100 bool lbpme;
101 bool lbprz;
102 bool dpofua;
103 bool has_write_same;
104 bool request_timed_out;
105 } IscsiLun;
106
107 typedef struct IscsiTask {
108 int status;
109 int complete;
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 QEMUBH *bh;
123 IscsiLun *iscsilun;
124 struct scsi_task *task;
125 int status;
126 int64_t sector_num;
127 int nb_sectors;
128 int ret;
129 #ifdef __linux__
130 sg_io_hdr_t *ioh;
131 #endif
132 bool cancelled;
133 } IscsiAIOCB;
134
135 /* libiscsi uses time_t so its enough to process events every second */
136 #define EVENT_INTERVAL 1000
137 #define NOP_INTERVAL 5000
138 #define MAX_NOP_FAILURES 3
139 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
140 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
141
142 /* this threshold is a trade-off knob to choose between
143 * the potential additional overhead of an extra GET_LBA_STATUS request
144 * vs. unnecessarily reading a lot of zero sectors over the wire.
145 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
146 * sectors we check the allocation status of the area covered by the
147 * request first if the allocationmap indicates that the area might be
148 * unallocated. */
149 #define ISCSI_CHECKALLOC_THRES 64
150
151 #ifdef __linux__
152
153 static void
154 iscsi_bh_cb(void *p)
155 {
156 IscsiAIOCB *acb = p;
157
158 qemu_bh_delete(acb->bh);
159
160 acb->common.cb(acb->common.opaque, acb->status);
161
162 if (acb->task != NULL) {
163 scsi_free_scsi_task(acb->task);
164 acb->task = NULL;
165 }
166
167 qemu_aio_unref(acb);
168 }
169
170 static void
171 iscsi_schedule_bh(IscsiAIOCB *acb)
172 {
173 if (acb->bh) {
174 return;
175 }
176 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
177 qemu_bh_schedule(acb->bh);
178 }
179
180 #endif
181
182 static void iscsi_co_generic_bh_cb(void *opaque)
183 {
184 struct IscsiTask *iTask = opaque;
185
186 iTask->complete = 1;
187 aio_co_wake(iTask->co);
188 }
189
190 static void iscsi_retry_timer_expired(void *opaque)
191 {
192 struct IscsiTask *iTask = opaque;
193 iTask->complete = 1;
194 if (iTask->co) {
195 aio_co_wake(iTask->co);
196 }
197 }
198
199 static inline unsigned exp_random(double mean)
200 {
201 return -mean * log((double)rand() / RAND_MAX);
202 }
203
204 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
205 * libiscsi 1.10.0, together with other constants we need. Use it as
206 * a hint that we have to define them ourselves if needed, to keep the
207 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
208 * the test because SCSI_STATUS_* is an enum.
209 *
210 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
211 * an enum, check against the LIBISCSI_API_VERSION macro, which was
212 * introduced in 1.11.0. If it is present, there is no need to define
213 * anything.
214 */
215 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
216 !defined(LIBISCSI_API_VERSION)
217 #define SCSI_STATUS_TASK_SET_FULL 0x28
218 #define SCSI_STATUS_TIMEOUT 0x0f000002
219 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
220 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
221 #endif
222
223 #ifndef LIBISCSI_API_VERSION
224 #define LIBISCSI_API_VERSION 20130701
225 #endif
226
227 static int iscsi_translate_sense(struct scsi_sense *sense)
228 {
229 return scsi_sense_to_errno(sense->key,
230 (sense->ascq & 0xFF00) >> 8,
231 sense->ascq & 0xFF);
232 }
233
234 /* Called (via iscsi_service) with QemuMutex held. */
235 static void
236 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
237 void *command_data, void *opaque)
238 {
239 struct IscsiTask *iTask = opaque;
240 struct scsi_task *task = command_data;
241
242 iTask->status = status;
243 iTask->do_retry = 0;
244 iTask->err_code = 0;
245 iTask->task = task;
246
247 if (status != SCSI_STATUS_GOOD) {
248 iTask->err_code = -EIO;
249 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
250 if (status == SCSI_STATUS_BUSY ||
251 status == SCSI_STATUS_TIMEOUT ||
252 status == SCSI_STATUS_TASK_SET_FULL) {
253 unsigned retry_time =
254 exp_random(iscsi_retry_times[iTask->retries - 1]);
255 if (status == SCSI_STATUS_TIMEOUT) {
256 /* make sure the request is rescheduled AFTER the
257 * reconnect is initiated */
258 retry_time = EVENT_INTERVAL * 2;
259 iTask->iscsilun->request_timed_out = true;
260 }
261 error_report("iSCSI Busy/TaskSetFull/TimeOut"
262 " (retry #%u in %u ms): %s",
263 iTask->retries, retry_time,
264 iscsi_get_error(iscsi));
265 aio_timer_init(iTask->iscsilun->aio_context,
266 &iTask->retry_timer, QEMU_CLOCK_REALTIME,
267 SCALE_MS, iscsi_retry_timer_expired, iTask);
268 timer_mod(&iTask->retry_timer,
269 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
270 iTask->do_retry = 1;
271 } else if (status == SCSI_STATUS_CHECK_CONDITION) {
272 int error = iscsi_translate_sense(&task->sense);
273 if (error == EAGAIN) {
274 error_report("iSCSI CheckCondition: %s",
275 iscsi_get_error(iscsi));
276 iTask->do_retry = 1;
277 } else {
278 iTask->err_code = -error;
279 iTask->err_str = g_strdup(iscsi_get_error(iscsi));
280 }
281 }
282 }
283 }
284
285 if (iTask->co) {
286 replay_bh_schedule_oneshot_event(iTask->iscsilun->aio_context,
287 iscsi_co_generic_bh_cb, iTask);
288 } else {
289 iTask->complete = 1;
290 }
291 }
292
293 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
294 {
295 *iTask = (struct IscsiTask) {
296 .co = qemu_coroutine_self(),
297 .iscsilun = iscsilun,
298 };
299 }
300
301 #ifdef __linux__
302
303 /* Called (via iscsi_service) with QemuMutex held. */
304 static void
305 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
306 void *private_data)
307 {
308 IscsiAIOCB *acb = private_data;
309
310 /* If the command callback hasn't been called yet, drop the task */
311 if (!acb->bh) {
312 /* Call iscsi_aio_ioctl_cb() with SCSI_STATUS_CANCELLED */
313 iscsi_scsi_cancel_task(iscsi, acb->task);
314 }
315
316 qemu_aio_unref(acb); /* acquired in iscsi_aio_cancel() */
317 }
318
319 static void
320 iscsi_aio_cancel(BlockAIOCB *blockacb)
321 {
322 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
323 IscsiLun *iscsilun = acb->iscsilun;
324
325 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
326
327 /* If it was cancelled or completed already, our work is done here */
328 if (acb->cancelled || acb->status != -EINPROGRESS) {
329 return;
330 }
331
332 acb->cancelled = true;
333
334 qemu_aio_ref(acb); /* released in iscsi_abort_task_cb() */
335
336 /* send a task mgmt call to the target to cancel the task on the target */
337 if (iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
338 iscsi_abort_task_cb, acb) < 0) {
339 qemu_aio_unref(acb); /* since iscsi_abort_task_cb() won't be called */
340 }
341 }
342 }
343
344 static const AIOCBInfo iscsi_aiocb_info = {
345 .aiocb_size = sizeof(IscsiAIOCB),
346 .cancel_async = iscsi_aio_cancel,
347 };
348
349 #endif
350
351 static void iscsi_process_read(void *arg);
352 static void iscsi_process_write(void *arg);
353
354 /* Called with QemuMutex held. */
355 static void
356 iscsi_set_events(IscsiLun *iscsilun)
357 {
358 struct iscsi_context *iscsi = iscsilun->iscsi;
359 int ev = iscsi_which_events(iscsi);
360
361 if (ev != iscsilun->events) {
362 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
363 false,
364 (ev & POLLIN) ? iscsi_process_read : NULL,
365 (ev & POLLOUT) ? iscsi_process_write : NULL,
366 NULL,
367 iscsilun);
368 iscsilun->events = ev;
369 }
370 }
371
372 static void iscsi_timed_check_events(void *opaque)
373 {
374 IscsiLun *iscsilun = opaque;
375
376 WITH_QEMU_LOCK_GUARD(&iscsilun->mutex) {
377 /* check for timed out requests */
378 iscsi_service(iscsilun->iscsi, 0);
379
380 if (iscsilun->request_timed_out) {
381 iscsilun->request_timed_out = false;
382 iscsi_reconnect(iscsilun->iscsi);
383 }
384
385 /*
386 * newer versions of libiscsi may return zero events. Ensure we are
387 * able to return to service once this situation changes.
388 */
389 iscsi_set_events(iscsilun);
390 }
391
392 timer_mod(iscsilun->event_timer,
393 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
394 }
395
396 static void
397 iscsi_process_read(void *arg)
398 {
399 IscsiLun *iscsilun = arg;
400 struct iscsi_context *iscsi = iscsilun->iscsi;
401
402 qemu_mutex_lock(&iscsilun->mutex);
403 iscsi_service(iscsi, POLLIN);
404 iscsi_set_events(iscsilun);
405 qemu_mutex_unlock(&iscsilun->mutex);
406 }
407
408 static void
409 iscsi_process_write(void *arg)
410 {
411 IscsiLun *iscsilun = arg;
412 struct iscsi_context *iscsi = iscsilun->iscsi;
413
414 qemu_mutex_lock(&iscsilun->mutex);
415 iscsi_service(iscsi, POLLOUT);
416 iscsi_set_events(iscsilun);
417 qemu_mutex_unlock(&iscsilun->mutex);
418 }
419
420 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
421 {
422 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
423 }
424
425 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
426 {
427 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
428 }
429
430 static bool is_byte_request_lun_aligned(int64_t offset, int count,
431 IscsiLun *iscsilun)
432 {
433 if (offset % iscsilun->block_size || count % iscsilun->block_size) {
434 error_report("iSCSI misaligned request: "
435 "iscsilun->block_size %u, offset %" PRIi64
436 ", count %d",
437 iscsilun->block_size, offset, count);
438 return false;
439 }
440 return true;
441 }
442
443 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
444 IscsiLun *iscsilun)
445 {
446 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
447 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
448 nb_sectors << BDRV_SECTOR_BITS,
449 iscsilun);
450 }
451
452 static void iscsi_allocmap_free(IscsiLun *iscsilun)
453 {
454 g_free(iscsilun->allocmap);
455 g_free(iscsilun->allocmap_valid);
456 iscsilun->allocmap = NULL;
457 iscsilun->allocmap_valid = NULL;
458 }
459
460
461 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
462 {
463 iscsi_allocmap_free(iscsilun);
464
465 assert(iscsilun->cluster_size);
466 iscsilun->allocmap_size =
467 DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size,
468 iscsilun->cluster_size);
469
470 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
471 if (!iscsilun->allocmap) {
472 return -ENOMEM;
473 }
474
475 if (open_flags & BDRV_O_NOCACHE) {
476 /* when cache.direct = on all allocmap entries are
477 * treated as invalid to force a relookup of the block
478 * status on every read request */
479 return 0;
480 }
481
482 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size);
483 if (!iscsilun->allocmap_valid) {
484 /* if we are under memory pressure free the allocmap as well */
485 iscsi_allocmap_free(iscsilun);
486 return -ENOMEM;
487 }
488
489 return 0;
490 }
491
492 static void
493 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset,
494 int64_t bytes, bool allocated, bool valid)
495 {
496 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
497
498 if (iscsilun->allocmap == NULL) {
499 return;
500 }
501 /* expand to entirely contain all affected clusters */
502 assert(iscsilun->cluster_size);
503 cl_num_expanded = offset / iscsilun->cluster_size;
504 nb_cls_expanded = DIV_ROUND_UP(offset + bytes,
505 iscsilun->cluster_size) - cl_num_expanded;
506 /* shrink to touch only completely contained clusters */
507 cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size);
508 nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk;
509 if (allocated) {
510 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
511 } else {
512 if (nb_cls_shrunk > 0) {
513 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk);
514 }
515 }
516
517 if (iscsilun->allocmap_valid == NULL) {
518 return;
519 }
520 if (valid) {
521 if (nb_cls_shrunk > 0) {
522 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk);
523 }
524 } else {
525 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded,
526 nb_cls_expanded);
527 }
528 }
529
530 static void
531 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset,
532 int64_t bytes)
533 {
534 iscsi_allocmap_update(iscsilun, offset, bytes, true, true);
535 }
536
537 static void
538 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset,
539 int64_t bytes)
540 {
541 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
542 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
543 */
544 iscsi_allocmap_update(iscsilun, offset, bytes, false, true);
545 }
546
547 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset,
548 int64_t bytes)
549 {
550 iscsi_allocmap_update(iscsilun, offset, bytes, false, false);
551 }
552
553 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
554 {
555 if (iscsilun->allocmap) {
556 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size);
557 }
558 if (iscsilun->allocmap_valid) {
559 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size);
560 }
561 }
562
563 static inline bool
564 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset,
565 int64_t bytes)
566 {
567 unsigned long size;
568 if (iscsilun->allocmap == NULL) {
569 return true;
570 }
571 assert(iscsilun->cluster_size);
572 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
573 return !(find_next_bit(iscsilun->allocmap, size,
574 offset / iscsilun->cluster_size) == size);
575 }
576
577 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
578 int64_t offset, int64_t bytes)
579 {
580 unsigned long size;
581 if (iscsilun->allocmap_valid == NULL) {
582 return false;
583 }
584 assert(iscsilun->cluster_size);
585 size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
586 return (find_next_zero_bit(iscsilun->allocmap_valid, size,
587 offset / iscsilun->cluster_size) == size);
588 }
589
590 static void coroutine_fn iscsi_co_wait_for_task(IscsiTask *iTask,
591 IscsiLun *iscsilun)
592 {
593 while (!iTask->complete) {
594 iscsi_set_events(iscsilun);
595 qemu_mutex_unlock(&iscsilun->mutex);
596 qemu_coroutine_yield();
597 qemu_mutex_lock(&iscsilun->mutex);
598 }
599 }
600
601 static int coroutine_fn
602 iscsi_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
603 QEMUIOVector *iov, int flags)
604 {
605 IscsiLun *iscsilun = bs->opaque;
606 struct IscsiTask iTask;
607 uint64_t lba;
608 uint32_t num_sectors;
609 bool fua = flags & BDRV_REQ_FUA;
610 int r = 0;
611
612 if (fua) {
613 assert(iscsilun->dpofua);
614 }
615 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
616 return -EINVAL;
617 }
618
619 if (bs->bl.max_transfer) {
620 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
621 }
622
623 lba = sector_qemu2lun(sector_num, iscsilun);
624 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
625 iscsi_co_init_iscsitask(iscsilun, &iTask);
626 qemu_mutex_lock(&iscsilun->mutex);
627 retry:
628 if (iscsilun->use_16_for_rw) {
629 #if LIBISCSI_API_VERSION >= (20160603)
630 iTask.task = iscsi_write16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
631 NULL, num_sectors * iscsilun->block_size,
632 iscsilun->block_size, 0, 0, fua, 0, 0,
633 iscsi_co_generic_cb, &iTask,
634 (struct scsi_iovec *)iov->iov, iov->niov);
635 } else {
636 iTask.task = iscsi_write10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
637 NULL, num_sectors * iscsilun->block_size,
638 iscsilun->block_size, 0, 0, fua, 0, 0,
639 iscsi_co_generic_cb, &iTask,
640 (struct scsi_iovec *)iov->iov, iov->niov);
641 }
642 #else
643 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
644 NULL, num_sectors * iscsilun->block_size,
645 iscsilun->block_size, 0, 0, fua, 0, 0,
646 iscsi_co_generic_cb, &iTask);
647 } else {
648 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
649 NULL, num_sectors * iscsilun->block_size,
650 iscsilun->block_size, 0, 0, fua, 0, 0,
651 iscsi_co_generic_cb, &iTask);
652 }
653 #endif
654 if (iTask.task == NULL) {
655 qemu_mutex_unlock(&iscsilun->mutex);
656 return -ENOMEM;
657 }
658 #if LIBISCSI_API_VERSION < (20160603)
659 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
660 iov->niov);
661 #endif
662 iscsi_co_wait_for_task(&iTask, iscsilun);
663
664 if (iTask.task != NULL) {
665 scsi_free_scsi_task(iTask.task);
666 iTask.task = NULL;
667 }
668
669 if (iTask.do_retry) {
670 iTask.complete = 0;
671 goto retry;
672 }
673
674 if (iTask.status != SCSI_STATUS_GOOD) {
675 iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
676 nb_sectors * BDRV_SECTOR_SIZE);
677 error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba,
678 iTask.err_str);
679 r = iTask.err_code;
680 goto out_unlock;
681 }
682
683 iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
684 nb_sectors * BDRV_SECTOR_SIZE);
685
686 out_unlock:
687 qemu_mutex_unlock(&iscsilun->mutex);
688 g_free(iTask.err_str);
689 return r;
690 }
691
692
693
694 static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs,
695 bool want_zero, int64_t offset,
696 int64_t bytes, int64_t *pnum,
697 int64_t *map,
698 BlockDriverState **file)
699 {
700 IscsiLun *iscsilun = bs->opaque;
701 struct scsi_get_lba_status *lbas = NULL;
702 struct scsi_lba_status_descriptor *lbasd = NULL;
703 struct IscsiTask iTask;
704 uint64_t lba, max_bytes;
705 int ret;
706
707 iscsi_co_init_iscsitask(iscsilun, &iTask);
708
709 assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size));
710
711 /* default to all sectors allocated */
712 ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
713 if (map) {
714 *map = offset;
715 }
716 *pnum = bytes;
717
718 /* LUN does not support logical block provisioning */
719 if (!iscsilun->lbpme) {
720 goto out;
721 }
722
723 lba = offset / iscsilun->block_size;
724 max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size;
725
726 qemu_mutex_lock(&iscsilun->mutex);
727 retry:
728 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
729 lba, 8 + 16, iscsi_co_generic_cb,
730 &iTask) == NULL) {
731 ret = -ENOMEM;
732 goto out_unlock;
733 }
734 iscsi_co_wait_for_task(&iTask, iscsilun);
735
736 if (iTask.do_retry) {
737 if (iTask.task != NULL) {
738 scsi_free_scsi_task(iTask.task);
739 iTask.task = NULL;
740 }
741 iTask.complete = 0;
742 goto retry;
743 }
744
745 if (iTask.status != SCSI_STATUS_GOOD) {
746 /* in case the get_lba_status_callout fails (i.e.
747 * because the device is busy or the cmd is not
748 * supported) we pretend all blocks are allocated
749 * for backwards compatibility */
750 error_report("iSCSI GET_LBA_STATUS failed at lba %" PRIu64 ": %s",
751 lba, iTask.err_str);
752 goto out_unlock;
753 }
754
755 lbas = scsi_datain_unmarshall(iTask.task);
756 if (lbas == NULL || lbas->num_descriptors == 0) {
757 ret = -EIO;
758 goto out_unlock;
759 }
760
761 lbasd = &lbas->descriptors[0];
762
763 if (lba != lbasd->lba) {
764 ret = -EIO;
765 goto out_unlock;
766 }
767
768 *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes);
769
770 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
771 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
772 ret &= ~BDRV_BLOCK_DATA;
773 if (iscsilun->lbprz) {
774 ret |= BDRV_BLOCK_ZERO;
775 }
776 }
777
778 if (ret & BDRV_BLOCK_ZERO) {
779 iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum);
780 } else {
781 iscsi_allocmap_set_allocated(iscsilun, offset, *pnum);
782 }
783
784 if (*pnum > bytes) {
785 *pnum = bytes;
786 }
787 out_unlock:
788 qemu_mutex_unlock(&iscsilun->mutex);
789 g_free(iTask.err_str);
790 out:
791 if (iTask.task != NULL) {
792 scsi_free_scsi_task(iTask.task);
793 }
794 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) {
795 *file = bs;
796 }
797 return ret;
798 }
799
800 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
801 int64_t sector_num, int nb_sectors,
802 QEMUIOVector *iov)
803 {
804 IscsiLun *iscsilun = bs->opaque;
805 struct IscsiTask iTask;
806 uint64_t lba;
807 uint32_t num_sectors;
808 int r = 0;
809
810 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
811 return -EINVAL;
812 }
813
814 if (bs->bl.max_transfer) {
815 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
816 }
817
818 /* if cache.direct is off and we have a valid entry in our allocation map
819 * we can skip checking the block status and directly return zeroes if
820 * the request falls within an unallocated area */
821 if (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 qemu_iovec_memset(iov, 0, 0x00, iov->size);
826 return 0;
827 }
828
829 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
830 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
831 nb_sectors * BDRV_SECTOR_SIZE) &&
832 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
833 nb_sectors * BDRV_SECTOR_SIZE)) {
834 int64_t pnum;
835 /* check the block status from the beginning of the cluster
836 * containing the start sector */
837 int64_t head;
838 int ret;
839
840 assert(iscsilun->cluster_size);
841 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size;
842 ret = iscsi_co_block_status(bs, true,
843 sector_num * BDRV_SECTOR_SIZE - head,
844 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL);
845 if (ret < 0) {
846 return ret;
847 }
848 /* if the whole request falls into an unallocated area we can avoid
849 * reading and directly return zeroes instead */
850 if (ret & BDRV_BLOCK_ZERO &&
851 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) {
852 qemu_iovec_memset(iov, 0, 0x00, iov->size);
853 return 0;
854 }
855 }
856
857 lba = sector_qemu2lun(sector_num, iscsilun);
858 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
859
860 iscsi_co_init_iscsitask(iscsilun, &iTask);
861 qemu_mutex_lock(&iscsilun->mutex);
862 retry:
863 if (iscsilun->use_16_for_rw) {
864 #if LIBISCSI_API_VERSION >= (20160603)
865 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
866 num_sectors * iscsilun->block_size,
867 iscsilun->block_size, 0, 0, 0, 0, 0,
868 iscsi_co_generic_cb, &iTask,
869 (struct scsi_iovec *)iov->iov, iov->niov);
870 } else {
871 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
872 num_sectors * iscsilun->block_size,
873 iscsilun->block_size,
874 0, 0, 0, 0, 0,
875 iscsi_co_generic_cb, &iTask,
876 (struct scsi_iovec *)iov->iov, iov->niov);
877 }
878 #else
879 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
880 num_sectors * iscsilun->block_size,
881 iscsilun->block_size, 0, 0, 0, 0, 0,
882 iscsi_co_generic_cb, &iTask);
883 } else {
884 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
885 num_sectors * iscsilun->block_size,
886 iscsilun->block_size,
887 0, 0, 0, 0, 0,
888 iscsi_co_generic_cb, &iTask);
889 }
890 #endif
891 if (iTask.task == NULL) {
892 qemu_mutex_unlock(&iscsilun->mutex);
893 return -ENOMEM;
894 }
895 #if LIBISCSI_API_VERSION < (20160603)
896 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
897 #endif
898
899 iscsi_co_wait_for_task(&iTask, iscsilun);
900 if (iTask.task != NULL) {
901 scsi_free_scsi_task(iTask.task);
902 iTask.task = NULL;
903 }
904
905 if (iTask.do_retry) {
906 iTask.complete = 0;
907 goto retry;
908 }
909
910 if (iTask.status != SCSI_STATUS_GOOD) {
911 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s",
912 lba, iTask.err_str);
913 r = iTask.err_code;
914 }
915
916 qemu_mutex_unlock(&iscsilun->mutex);
917 g_free(iTask.err_str);
918 return r;
919 }
920
921 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
922 {
923 IscsiLun *iscsilun = bs->opaque;
924 struct IscsiTask iTask;
925 int r = 0;
926
927 iscsi_co_init_iscsitask(iscsilun, &iTask);
928 qemu_mutex_lock(&iscsilun->mutex);
929 retry:
930 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
931 0, iscsi_co_generic_cb, &iTask) == NULL) {
932 qemu_mutex_unlock(&iscsilun->mutex);
933 return -ENOMEM;
934 }
935
936 iscsi_co_wait_for_task(&iTask, iscsilun);
937
938 if (iTask.task != NULL) {
939 scsi_free_scsi_task(iTask.task);
940 iTask.task = NULL;
941 }
942
943 if (iTask.do_retry) {
944 iTask.complete = 0;
945 goto retry;
946 }
947
948 if (iTask.status != SCSI_STATUS_GOOD) {
949 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str);
950 r = iTask.err_code;
951 }
952
953 qemu_mutex_unlock(&iscsilun->mutex);
954 g_free(iTask.err_str);
955 return r;
956 }
957
958 #ifdef __linux__
959 /* Called (via iscsi_service) with QemuMutex held. */
960 static void
961 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
962 void *command_data, void *opaque)
963 {
964 IscsiAIOCB *acb = opaque;
965
966 if (status == SCSI_STATUS_CANCELLED) {
967 if (!acb->bh) {
968 acb->status = -ECANCELED;
969 iscsi_schedule_bh(acb);
970 }
971 return;
972 }
973
974 acb->status = 0;
975 if (status < 0) {
976 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
977 iscsi_get_error(iscsi));
978 acb->status = -iscsi_translate_sense(&acb->task->sense);
979 }
980
981 acb->ioh->driver_status = 0;
982 acb->ioh->host_status = 0;
983 acb->ioh->resid = 0;
984 acb->ioh->status = status;
985
986 #define SG_ERR_DRIVER_SENSE 0x08
987
988 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
989 int ss;
990
991 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
992
993 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
994 ss = MIN(acb->ioh->mx_sb_len, acb->ioh->sb_len_wr);
995 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
996 }
997
998 iscsi_schedule_bh(acb);
999 }
1000
1001 static void iscsi_ioctl_bh_completion(void *opaque)
1002 {
1003 IscsiAIOCB *acb = opaque;
1004
1005 qemu_bh_delete(acb->bh);
1006 acb->common.cb(acb->common.opaque, acb->ret);
1007 qemu_aio_unref(acb);
1008 }
1009
1010 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
1011 {
1012 BlockDriverState *bs = acb->common.bs;
1013 IscsiLun *iscsilun = bs->opaque;
1014 int ret = 0;
1015
1016 switch (req) {
1017 case SG_GET_VERSION_NUM:
1018 *(int *)buf = 30000;
1019 break;
1020 case SG_GET_SCSI_ID:
1021 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
1022 break;
1023 default:
1024 ret = -EINVAL;
1025 }
1026 assert(!acb->bh);
1027 acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
1028 iscsi_ioctl_bh_completion, acb);
1029 acb->ret = ret;
1030 qemu_bh_schedule(acb->bh);
1031 }
1032
1033 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
1034 unsigned long int req, void *buf,
1035 BlockCompletionFunc *cb, void *opaque)
1036 {
1037 IscsiLun *iscsilun = bs->opaque;
1038 struct iscsi_context *iscsi = iscsilun->iscsi;
1039 struct iscsi_data data;
1040 IscsiAIOCB *acb;
1041
1042 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
1043
1044 acb->iscsilun = iscsilun;
1045 acb->bh = NULL;
1046 acb->status = -EINPROGRESS;
1047 acb->ioh = buf;
1048 acb->cancelled = false;
1049
1050 if (req != SG_IO) {
1051 iscsi_ioctl_handle_emulated(acb, req, buf);
1052 return &acb->common;
1053 }
1054
1055 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
1056 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
1057 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
1058 qemu_aio_unref(acb);
1059 return NULL;
1060 }
1061
1062 acb->task = malloc(sizeof(struct scsi_task));
1063 if (acb->task == NULL) {
1064 error_report("iSCSI: Failed to allocate task for scsi command. %s",
1065 iscsi_get_error(iscsi));
1066 qemu_aio_unref(acb);
1067 return NULL;
1068 }
1069 memset(acb->task, 0, sizeof(struct scsi_task));
1070
1071 switch (acb->ioh->dxfer_direction) {
1072 case SG_DXFER_TO_DEV:
1073 acb->task->xfer_dir = SCSI_XFER_WRITE;
1074 break;
1075 case SG_DXFER_FROM_DEV:
1076 acb->task->xfer_dir = SCSI_XFER_READ;
1077 break;
1078 default:
1079 acb->task->xfer_dir = SCSI_XFER_NONE;
1080 break;
1081 }
1082
1083 acb->task->cdb_size = acb->ioh->cmd_len;
1084 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
1085 acb->task->expxferlen = acb->ioh->dxfer_len;
1086
1087 data.size = 0;
1088 qemu_mutex_lock(&iscsilun->mutex);
1089 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
1090 if (acb->ioh->iovec_count == 0) {
1091 data.data = acb->ioh->dxferp;
1092 data.size = acb->ioh->dxfer_len;
1093 } else {
1094 scsi_task_set_iov_out(acb->task,
1095 (struct scsi_iovec *) acb->ioh->dxferp,
1096 acb->ioh->iovec_count);
1097 }
1098 }
1099
1100 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1101 iscsi_aio_ioctl_cb,
1102 (data.size > 0) ? &data : NULL,
1103 acb) != 0) {
1104 qemu_mutex_unlock(&iscsilun->mutex);
1105 scsi_free_scsi_task(acb->task);
1106 qemu_aio_unref(acb);
1107 return NULL;
1108 }
1109
1110 /* tell libiscsi to read straight into the buffer we got from ioctl */
1111 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1112 if (acb->ioh->iovec_count == 0) {
1113 scsi_task_add_data_in_buffer(acb->task,
1114 acb->ioh->dxfer_len,
1115 acb->ioh->dxferp);
1116 } else {
1117 scsi_task_set_iov_in(acb->task,
1118 (struct scsi_iovec *) acb->ioh->dxferp,
1119 acb->ioh->iovec_count);
1120 }
1121 }
1122
1123 iscsi_set_events(iscsilun);
1124 qemu_mutex_unlock(&iscsilun->mutex);
1125
1126 return &acb->common;
1127 }
1128
1129 #endif
1130
1131 static int64_t
1132 iscsi_getlength(BlockDriverState *bs)
1133 {
1134 IscsiLun *iscsilun = bs->opaque;
1135 int64_t len;
1136
1137 len = iscsilun->num_blocks;
1138 len *= iscsilun->block_size;
1139
1140 return len;
1141 }
1142
1143 static int
1144 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
1145 {
1146 IscsiLun *iscsilun = bs->opaque;
1147 struct IscsiTask iTask;
1148 struct unmap_list list;
1149 int r = 0;
1150
1151 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1152 return -ENOTSUP;
1153 }
1154
1155 if (!iscsilun->lbp.lbpu) {
1156 /* UNMAP is not supported by the target */
1157 return 0;
1158 }
1159
1160 list.lba = offset / iscsilun->block_size;
1161 list.num = bytes / iscsilun->block_size;
1162
1163 iscsi_co_init_iscsitask(iscsilun, &iTask);
1164 qemu_mutex_lock(&iscsilun->mutex);
1165 retry:
1166 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1167 iscsi_co_generic_cb, &iTask) == NULL) {
1168 r = -ENOMEM;
1169 goto out_unlock;
1170 }
1171
1172 iscsi_co_wait_for_task(&iTask, iscsilun);
1173
1174 if (iTask.task != NULL) {
1175 scsi_free_scsi_task(iTask.task);
1176 iTask.task = NULL;
1177 }
1178
1179 if (iTask.do_retry) {
1180 iTask.complete = 0;
1181 goto retry;
1182 }
1183
1184 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1185
1186 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1187 /* the target might fail with a check condition if it
1188 is not happy with the alignment of the UNMAP request
1189 we silently fail in this case */
1190 goto out_unlock;
1191 }
1192
1193 if (iTask.status != SCSI_STATUS_GOOD) {
1194 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s",
1195 list.lba, iTask.err_str);
1196 r = iTask.err_code;
1197 goto out_unlock;
1198 }
1199
1200 out_unlock:
1201 qemu_mutex_unlock(&iscsilun->mutex);
1202 g_free(iTask.err_str);
1203 return r;
1204 }
1205
1206 static int
1207 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1208 int bytes, BdrvRequestFlags flags)
1209 {
1210 IscsiLun *iscsilun = bs->opaque;
1211 struct IscsiTask iTask;
1212 uint64_t lba;
1213 uint32_t nb_blocks;
1214 bool use_16_for_ws = iscsilun->use_16_for_rw;
1215 int r = 0;
1216
1217 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1218 return -ENOTSUP;
1219 }
1220
1221 if (flags & BDRV_REQ_MAY_UNMAP) {
1222 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1223 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1224 use_16_for_ws = true;
1225 }
1226 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1227 /* WRITESAME16 with UNMAP is not supported by the target,
1228 * fall back and try WRITESAME10/16 without UNMAP */
1229 flags &= ~BDRV_REQ_MAY_UNMAP;
1230 use_16_for_ws = iscsilun->use_16_for_rw;
1231 }
1232 }
1233
1234 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1235 /* WRITESAME without UNMAP is not supported by the target */
1236 return -ENOTSUP;
1237 }
1238
1239 lba = offset / iscsilun->block_size;
1240 nb_blocks = bytes / iscsilun->block_size;
1241
1242 if (iscsilun->zeroblock == NULL) {
1243 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1244 if (iscsilun->zeroblock == NULL) {
1245 return -ENOMEM;
1246 }
1247 }
1248
1249 qemu_mutex_lock(&iscsilun->mutex);
1250 iscsi_co_init_iscsitask(iscsilun, &iTask);
1251 retry:
1252 if (use_16_for_ws) {
1253 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1254 iscsilun->zeroblock, iscsilun->block_size,
1255 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1256 0, 0, iscsi_co_generic_cb, &iTask);
1257 } else {
1258 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1259 iscsilun->zeroblock, iscsilun->block_size,
1260 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1261 0, 0, iscsi_co_generic_cb, &iTask);
1262 }
1263 if (iTask.task == NULL) {
1264 qemu_mutex_unlock(&iscsilun->mutex);
1265 return -ENOMEM;
1266 }
1267
1268 iscsi_co_wait_for_task(&iTask, iscsilun);
1269
1270 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1271 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1272 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1273 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1274 /* WRITE SAME is not supported by the target */
1275 iscsilun->has_write_same = false;
1276 scsi_free_scsi_task(iTask.task);
1277 r = -ENOTSUP;
1278 goto out_unlock;
1279 }
1280
1281 if (iTask.task != NULL) {
1282 scsi_free_scsi_task(iTask.task);
1283 iTask.task = NULL;
1284 }
1285
1286 if (iTask.do_retry) {
1287 iTask.complete = 0;
1288 goto retry;
1289 }
1290
1291 if (iTask.status != SCSI_STATUS_GOOD) {
1292 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1293 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s",
1294 lba, iTask.err_str);
1295 r = iTask.err_code;
1296 goto out_unlock;
1297 }
1298
1299 if (flags & BDRV_REQ_MAY_UNMAP) {
1300 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1301 } else {
1302 iscsi_allocmap_set_allocated(iscsilun, offset, bytes);
1303 }
1304
1305 out_unlock:
1306 qemu_mutex_unlock(&iscsilun->mutex);
1307 g_free(iTask.err_str);
1308 return r;
1309 }
1310
1311 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
1312 Error **errp)
1313 {
1314 const char *user = NULL;
1315 const char *password = NULL;
1316 const char *secretid;
1317 char *secret = NULL;
1318
1319 user = qemu_opt_get(opts, "user");
1320 if (!user) {
1321 return;
1322 }
1323
1324 secretid = qemu_opt_get(opts, "password-secret");
1325 password = qemu_opt_get(opts, "password");
1326 if (secretid && password) {
1327 error_setg(errp, "'password' and 'password-secret' properties are "
1328 "mutually exclusive");
1329 return;
1330 }
1331 if (secretid) {
1332 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1333 if (!secret) {
1334 return;
1335 }
1336 password = secret;
1337 } else if (!password) {
1338 error_setg(errp, "CHAP username specified but no password was given");
1339 return;
1340 }
1341
1342 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1343 error_setg(errp, "Failed to set initiator username and password");
1344 }
1345
1346 g_free(secret);
1347 }
1348
1349 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts,
1350 Error **errp)
1351 {
1352 const char *digest = NULL;
1353
1354 digest = qemu_opt_get(opts, "header-digest");
1355 if (!digest) {
1356 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1357 } else if (!strcmp(digest, "crc32c")) {
1358 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1359 } else if (!strcmp(digest, "none")) {
1360 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1361 } else if (!strcmp(digest, "crc32c-none")) {
1362 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1363 } else if (!strcmp(digest, "none-crc32c")) {
1364 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1365 } else {
1366 error_setg(errp, "Invalid header-digest setting : %s", digest);
1367 }
1368 }
1369
1370 static char *get_initiator_name(QemuOpts *opts)
1371 {
1372 const char *name;
1373 char *iscsi_name;
1374 UuidInfo *uuid_info;
1375
1376 name = qemu_opt_get(opts, "initiator-name");
1377 if (name) {
1378 return g_strdup(name);
1379 }
1380
1381 uuid_info = qmp_query_uuid(NULL);
1382 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1383 name = qemu_get_vm_name();
1384 } else {
1385 name = uuid_info->UUID;
1386 }
1387 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1388 name ? ":" : "", name ? name : "");
1389 qapi_free_UuidInfo(uuid_info);
1390 return iscsi_name;
1391 }
1392
1393 static void iscsi_nop_timed_event(void *opaque)
1394 {
1395 IscsiLun *iscsilun = opaque;
1396
1397 QEMU_LOCK_GUARD(&iscsilun->mutex);
1398 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1399 error_report("iSCSI: NOP timeout. Reconnecting...");
1400 iscsilun->request_timed_out = true;
1401 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1402 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1403 return;
1404 }
1405
1406 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1407 iscsi_set_events(iscsilun);
1408 }
1409
1410 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1411 {
1412 struct scsi_task *task = NULL;
1413 struct scsi_readcapacity10 *rc10 = NULL;
1414 struct scsi_readcapacity16 *rc16 = NULL;
1415 int retries = ISCSI_CMD_RETRIES;
1416
1417 do {
1418 if (task != NULL) {
1419 scsi_free_scsi_task(task);
1420 task = NULL;
1421 }
1422
1423 switch (iscsilun->type) {
1424 case TYPE_DISK:
1425 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1426 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1427 rc16 = scsi_datain_unmarshall(task);
1428 if (rc16 == NULL) {
1429 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1430 } else {
1431 iscsilun->block_size = rc16->block_length;
1432 iscsilun->num_blocks = rc16->returned_lba + 1;
1433 iscsilun->lbpme = !!rc16->lbpme;
1434 iscsilun->lbprz = !!rc16->lbprz;
1435 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1436 }
1437 break;
1438 }
1439 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1440 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1441 break;
1442 }
1443 /* Fall through and try READ CAPACITY(10) instead. */
1444 case TYPE_ROM:
1445 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1446 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1447 rc10 = scsi_datain_unmarshall(task);
1448 if (rc10 == NULL) {
1449 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1450 } else {
1451 iscsilun->block_size = rc10->block_size;
1452 if (rc10->lba == 0) {
1453 /* blank disk loaded */
1454 iscsilun->num_blocks = 0;
1455 } else {
1456 iscsilun->num_blocks = rc10->lba + 1;
1457 }
1458 }
1459 }
1460 break;
1461 default:
1462 return;
1463 }
1464 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1465 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1466 && retries-- > 0);
1467
1468 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1469 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1470 } else if (!iscsilun->block_size ||
1471 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1472 error_setg(errp, "iSCSI: the target returned an invalid "
1473 "block size of %d.", iscsilun->block_size);
1474 }
1475 if (task) {
1476 scsi_free_scsi_task(task);
1477 }
1478 }
1479
1480 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1481 int evpd, int pc, void **inq, Error **errp)
1482 {
1483 int full_size;
1484 struct scsi_task *task = NULL;
1485 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1486 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1487 goto fail;
1488 }
1489 full_size = scsi_datain_getfullsize(task);
1490 if (full_size > task->datain.size) {
1491 scsi_free_scsi_task(task);
1492
1493 /* we need more data for the full list */
1494 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1495 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1496 goto fail;
1497 }
1498 }
1499
1500 *inq = scsi_datain_unmarshall(task);
1501 if (*inq == NULL) {
1502 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1503 goto fail_with_err;
1504 }
1505
1506 return task;
1507
1508 fail:
1509 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1510 iscsi_get_error(iscsi));
1511 fail_with_err:
1512 if (task != NULL) {
1513 scsi_free_scsi_task(task);
1514 }
1515 return NULL;
1516 }
1517
1518 static void iscsi_detach_aio_context(BlockDriverState *bs)
1519 {
1520 IscsiLun *iscsilun = bs->opaque;
1521
1522 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1523 false, NULL, NULL, NULL, NULL);
1524 iscsilun->events = 0;
1525
1526 if (iscsilun->nop_timer) {
1527 timer_free(iscsilun->nop_timer);
1528 iscsilun->nop_timer = NULL;
1529 }
1530 if (iscsilun->event_timer) {
1531 timer_free(iscsilun->event_timer);
1532 iscsilun->event_timer = NULL;
1533 }
1534 }
1535
1536 static void iscsi_attach_aio_context(BlockDriverState *bs,
1537 AioContext *new_context)
1538 {
1539 IscsiLun *iscsilun = bs->opaque;
1540
1541 iscsilun->aio_context = new_context;
1542 iscsi_set_events(iscsilun);
1543
1544 /* Set up a timer for sending out iSCSI NOPs */
1545 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1546 QEMU_CLOCK_REALTIME, SCALE_MS,
1547 iscsi_nop_timed_event, iscsilun);
1548 timer_mod(iscsilun->nop_timer,
1549 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1550
1551 /* Set up a timer for periodic calls to iscsi_set_events and to
1552 * scan for command timeout */
1553 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1554 QEMU_CLOCK_REALTIME, SCALE_MS,
1555 iscsi_timed_check_events, iscsilun);
1556 timer_mod(iscsilun->event_timer,
1557 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1558 }
1559
1560 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1561 {
1562 struct scsi_task *task;
1563 struct scsi_mode_sense *ms = NULL;
1564 iscsilun->write_protected = false;
1565 iscsilun->dpofua = false;
1566
1567 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1568 1, SCSI_MODESENSE_PC_CURRENT,
1569 0x3F, 0, 255);
1570 if (task == NULL) {
1571 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1572 iscsi_get_error(iscsilun->iscsi));
1573 goto out;
1574 }
1575
1576 if (task->status != SCSI_STATUS_GOOD) {
1577 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1578 goto out;
1579 }
1580 ms = scsi_datain_unmarshall(task);
1581 if (!ms) {
1582 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1583 iscsi_get_error(iscsilun->iscsi));
1584 goto out;
1585 }
1586 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1587 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1588
1589 out:
1590 if (task) {
1591 scsi_free_scsi_task(task);
1592 }
1593 }
1594
1595 static void iscsi_parse_iscsi_option(const char *target, QDict *options)
1596 {
1597 QemuOptsList *list;
1598 QemuOpts *opts;
1599 const char *user, *password, *password_secret, *initiator_name,
1600 *header_digest, *timeout;
1601
1602 list = qemu_find_opts("iscsi");
1603 if (!list) {
1604 return;
1605 }
1606
1607 opts = qemu_opts_find(list, target);
1608 if (opts == NULL) {
1609 opts = QTAILQ_FIRST(&list->head);
1610 if (!opts) {
1611 return;
1612 }
1613 }
1614
1615 user = qemu_opt_get(opts, "user");
1616 if (user) {
1617 qdict_set_default_str(options, "user", user);
1618 }
1619
1620 password = qemu_opt_get(opts, "password");
1621 if (password) {
1622 qdict_set_default_str(options, "password", password);
1623 }
1624
1625 password_secret = qemu_opt_get(opts, "password-secret");
1626 if (password_secret) {
1627 qdict_set_default_str(options, "password-secret", password_secret);
1628 }
1629
1630 initiator_name = qemu_opt_get(opts, "initiator-name");
1631 if (initiator_name) {
1632 qdict_set_default_str(options, "initiator-name", initiator_name);
1633 }
1634
1635 header_digest = qemu_opt_get(opts, "header-digest");
1636 if (header_digest) {
1637 /* -iscsi takes upper case values, but QAPI only supports lower case
1638 * enum constant names, so we have to convert here. */
1639 char *qapi_value = g_ascii_strdown(header_digest, -1);
1640 qdict_set_default_str(options, "header-digest", qapi_value);
1641 g_free(qapi_value);
1642 }
1643
1644 timeout = qemu_opt_get(opts, "timeout");
1645 if (timeout) {
1646 qdict_set_default_str(options, "timeout", timeout);
1647 }
1648 }
1649
1650 /*
1651 * We support iscsi url's on the form
1652 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1653 */
1654 static void iscsi_parse_filename(const char *filename, QDict *options,
1655 Error **errp)
1656 {
1657 struct iscsi_url *iscsi_url;
1658 const char *transport_name;
1659 char *lun_str;
1660
1661 iscsi_url = iscsi_parse_full_url(NULL, filename);
1662 if (iscsi_url == NULL) {
1663 error_setg(errp, "Failed to parse URL : %s", filename);
1664 return;
1665 }
1666
1667 #if LIBISCSI_API_VERSION >= (20160603)
1668 switch (iscsi_url->transport) {
1669 case TCP_TRANSPORT:
1670 transport_name = "tcp";
1671 break;
1672 case ISER_TRANSPORT:
1673 transport_name = "iser";
1674 break;
1675 default:
1676 error_setg(errp, "Unknown transport type (%d)",
1677 iscsi_url->transport);
1678 return;
1679 }
1680 #else
1681 transport_name = "tcp";
1682 #endif
1683
1684 qdict_set_default_str(options, "transport", transport_name);
1685 qdict_set_default_str(options, "portal", iscsi_url->portal);
1686 qdict_set_default_str(options, "target", iscsi_url->target);
1687
1688 lun_str = g_strdup_printf("%d", iscsi_url->lun);
1689 qdict_set_default_str(options, "lun", lun_str);
1690 g_free(lun_str);
1691
1692 /* User/password from -iscsi take precedence over those from the URL */
1693 iscsi_parse_iscsi_option(iscsi_url->target, options);
1694
1695 if (iscsi_url->user[0] != '\0') {
1696 qdict_set_default_str(options, "user", iscsi_url->user);
1697 qdict_set_default_str(options, "password", iscsi_url->passwd);
1698 }
1699
1700 iscsi_destroy_url(iscsi_url);
1701 }
1702
1703 static QemuOptsList runtime_opts = {
1704 .name = "iscsi",
1705 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1706 .desc = {
1707 {
1708 .name = "transport",
1709 .type = QEMU_OPT_STRING,
1710 },
1711 {
1712 .name = "portal",
1713 .type = QEMU_OPT_STRING,
1714 },
1715 {
1716 .name = "target",
1717 .type = QEMU_OPT_STRING,
1718 },
1719 {
1720 .name = "user",
1721 .type = QEMU_OPT_STRING,
1722 },
1723 {
1724 .name = "password",
1725 .type = QEMU_OPT_STRING,
1726 },
1727 {
1728 .name = "password-secret",
1729 .type = QEMU_OPT_STRING,
1730 },
1731 {
1732 .name = "lun",
1733 .type = QEMU_OPT_NUMBER,
1734 },
1735 {
1736 .name = "initiator-name",
1737 .type = QEMU_OPT_STRING,
1738 },
1739 {
1740 .name = "header-digest",
1741 .type = QEMU_OPT_STRING,
1742 },
1743 {
1744 .name = "timeout",
1745 .type = QEMU_OPT_NUMBER,
1746 },
1747 { /* end of list */ }
1748 },
1749 };
1750
1751 static void iscsi_save_designator(IscsiLun *lun,
1752 struct scsi_inquiry_device_identification *inq_di)
1753 {
1754 struct scsi_inquiry_device_designator *desig, *copy = NULL;
1755
1756 for (desig = inq_di->designators; desig; desig = desig->next) {
1757 if (desig->association ||
1758 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) {
1759 continue;
1760 }
1761 /* NAA works better than T10 vendor ID based designator. */
1762 if (!copy || copy->designator_type < desig->designator_type) {
1763 copy = desig;
1764 }
1765 }
1766 if (copy) {
1767 lun->dd = g_new(struct scsi_inquiry_device_designator, 1);
1768 *lun->dd = *copy;
1769 lun->dd->next = NULL;
1770 lun->dd->designator = g_malloc(copy->designator_length);
1771 memcpy(lun->dd->designator, copy->designator, copy->designator_length);
1772 }
1773 }
1774
1775 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1776 Error **errp)
1777 {
1778 IscsiLun *iscsilun = bs->opaque;
1779 struct iscsi_context *iscsi = NULL;
1780 struct scsi_task *task = NULL;
1781 struct scsi_inquiry_standard *inq = NULL;
1782 struct scsi_inquiry_supported_pages *inq_vpd;
1783 char *initiator_name = NULL;
1784 QemuOpts *opts;
1785 Error *local_err = NULL;
1786 const char *transport_name, *portal, *target;
1787 #if LIBISCSI_API_VERSION >= (20160603)
1788 enum iscsi_transport_type transport;
1789 #endif
1790 int i, ret = 0, timeout = 0, lun;
1791
1792 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1793 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
1794 ret = -EINVAL;
1795 goto out;
1796 }
1797
1798 transport_name = qemu_opt_get(opts, "transport");
1799 portal = qemu_opt_get(opts, "portal");
1800 target = qemu_opt_get(opts, "target");
1801 lun = qemu_opt_get_number(opts, "lun", 0);
1802
1803 if (!transport_name || !portal || !target) {
1804 error_setg(errp, "Need all of transport, portal and target options");
1805 ret = -EINVAL;
1806 goto out;
1807 }
1808
1809 if (!strcmp(transport_name, "tcp")) {
1810 #if LIBISCSI_API_VERSION >= (20160603)
1811 transport = TCP_TRANSPORT;
1812 } else if (!strcmp(transport_name, "iser")) {
1813 transport = ISER_TRANSPORT;
1814 #else
1815 /* TCP is what older libiscsi versions always use */
1816 #endif
1817 } else {
1818 error_setg(errp, "Unknown transport: %s", transport_name);
1819 ret = -EINVAL;
1820 goto out;
1821 }
1822
1823 memset(iscsilun, 0, sizeof(IscsiLun));
1824
1825 initiator_name = get_initiator_name(opts);
1826
1827 iscsi = iscsi_create_context(initiator_name);
1828 if (iscsi == NULL) {
1829 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1830 ret = -ENOMEM;
1831 goto out;
1832 }
1833 #if LIBISCSI_API_VERSION >= (20160603)
1834 if (iscsi_init_transport(iscsi, transport)) {
1835 error_setg(errp, ("Error initializing transport."));
1836 ret = -EINVAL;
1837 goto out;
1838 }
1839 #endif
1840 if (iscsi_set_targetname(iscsi, target)) {
1841 error_setg(errp, "iSCSI: Failed to set target name.");
1842 ret = -EINVAL;
1843 goto out;
1844 }
1845
1846 /* check if we got CHAP username/password via the options */
1847 apply_chap(iscsi, opts, &local_err);
1848 if (local_err != NULL) {
1849 error_propagate(errp, local_err);
1850 ret = -EINVAL;
1851 goto out;
1852 }
1853
1854 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1855 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1856 ret = -EINVAL;
1857 goto out;
1858 }
1859
1860 /* check if we got HEADER_DIGEST via the options */
1861 apply_header_digest(iscsi, opts, &local_err);
1862 if (local_err != NULL) {
1863 error_propagate(errp, local_err);
1864 ret = -EINVAL;
1865 goto out;
1866 }
1867
1868 /* timeout handling is broken in libiscsi before 1.15.0 */
1869 timeout = qemu_opt_get_number(opts, "timeout", 0);
1870 #if LIBISCSI_API_VERSION >= 20150621
1871 iscsi_set_timeout(iscsi, timeout);
1872 #else
1873 if (timeout) {
1874 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1875 }
1876 #endif
1877
1878 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) {
1879 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1880 iscsi_get_error(iscsi));
1881 ret = -EINVAL;
1882 goto out;
1883 }
1884
1885 iscsilun->iscsi = iscsi;
1886 iscsilun->aio_context = bdrv_get_aio_context(bs);
1887 iscsilun->lun = lun;
1888 iscsilun->has_write_same = true;
1889
1890 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1891 (void **) &inq, errp);
1892 if (task == NULL) {
1893 ret = -EINVAL;
1894 goto out;
1895 }
1896 iscsilun->type = inq->periperal_device_type;
1897 scsi_free_scsi_task(task);
1898 task = NULL;
1899
1900 iscsi_modesense_sync(iscsilun);
1901 if (iscsilun->dpofua) {
1902 bs->supported_write_flags = BDRV_REQ_FUA;
1903 }
1904
1905 /* Check the write protect flag of the LUN if we want to write */
1906 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1907 iscsilun->write_protected) {
1908 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp);
1909 if (ret < 0) {
1910 goto out;
1911 }
1912 flags &= ~BDRV_O_RDWR;
1913 }
1914
1915 iscsi_readcapacity_sync(iscsilun, &local_err);
1916 if (local_err != NULL) {
1917 error_propagate(errp, local_err);
1918 ret = -EINVAL;
1919 goto out;
1920 }
1921 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1922
1923 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1924 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1925 * will try to read from the device to guess the image format.
1926 */
1927 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1928 bs->sg = true;
1929 }
1930
1931 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1932 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1933 (void **) &inq_vpd, errp);
1934 if (task == NULL) {
1935 ret = -EINVAL;
1936 goto out;
1937 }
1938 for (i = 0; i < inq_vpd->num_pages; i++) {
1939 struct scsi_task *inq_task;
1940 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1941 struct scsi_inquiry_block_limits *inq_bl;
1942 struct scsi_inquiry_device_identification *inq_di;
1943 switch (inq_vpd->pages[i]) {
1944 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1945 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1946 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1947 (void **) &inq_lbp, errp);
1948 if (inq_task == NULL) {
1949 ret = -EINVAL;
1950 goto out;
1951 }
1952 memcpy(&iscsilun->lbp, inq_lbp,
1953 sizeof(struct scsi_inquiry_logical_block_provisioning));
1954 scsi_free_scsi_task(inq_task);
1955 break;
1956 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1957 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1958 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1959 (void **) &inq_bl, errp);
1960 if (inq_task == NULL) {
1961 ret = -EINVAL;
1962 goto out;
1963 }
1964 memcpy(&iscsilun->bl, inq_bl,
1965 sizeof(struct scsi_inquiry_block_limits));
1966 scsi_free_scsi_task(inq_task);
1967 break;
1968 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION:
1969 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1970 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION,
1971 (void **) &inq_di, errp);
1972 if (inq_task == NULL) {
1973 ret = -EINVAL;
1974 goto out;
1975 }
1976 iscsi_save_designator(iscsilun, inq_di);
1977 scsi_free_scsi_task(inq_task);
1978 break;
1979 default:
1980 break;
1981 }
1982 }
1983 scsi_free_scsi_task(task);
1984 task = NULL;
1985
1986 qemu_mutex_init(&iscsilun->mutex);
1987 iscsi_attach_aio_context(bs, iscsilun->aio_context);
1988
1989 /* Guess the internal cluster (page) size of the iscsi target by the means
1990 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
1991 * reasonable size */
1992 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
1993 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
1994 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
1995 iscsilun->block_size;
1996 if (iscsilun->lbprz) {
1997 ret = iscsi_allocmap_init(iscsilun, flags);
1998 }
1999 }
2000
2001 if (iscsilun->lbprz && iscsilun->lbp.lbpws) {
2002 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
2003 }
2004
2005 out:
2006 qemu_opts_del(opts);
2007 g_free(initiator_name);
2008 if (task != NULL) {
2009 scsi_free_scsi_task(task);
2010 }
2011
2012 if (ret) {
2013 if (iscsi != NULL) {
2014 if (iscsi_is_logged_in(iscsi)) {
2015 iscsi_logout_sync(iscsi);
2016 }
2017 iscsi_destroy_context(iscsi);
2018 }
2019 memset(iscsilun, 0, sizeof(IscsiLun));
2020 }
2021
2022 return ret;
2023 }
2024
2025 static void iscsi_close(BlockDriverState *bs)
2026 {
2027 IscsiLun *iscsilun = bs->opaque;
2028 struct iscsi_context *iscsi = iscsilun->iscsi;
2029
2030 iscsi_detach_aio_context(bs);
2031 if (iscsi_is_logged_in(iscsi)) {
2032 iscsi_logout_sync(iscsi);
2033 }
2034 iscsi_destroy_context(iscsi);
2035 if (iscsilun->dd) {
2036 g_free(iscsilun->dd->designator);
2037 g_free(iscsilun->dd);
2038 }
2039 g_free(iscsilun->zeroblock);
2040 iscsi_allocmap_free(iscsilun);
2041 qemu_mutex_destroy(&iscsilun->mutex);
2042 memset(iscsilun, 0, sizeof(IscsiLun));
2043 }
2044
2045 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
2046 {
2047 /* We don't actually refresh here, but just return data queried in
2048 * iscsi_open(): iscsi targets don't change their limits. */
2049
2050 IscsiLun *iscsilun = bs->opaque;
2051 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
2052 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
2053
2054 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);
2055
2056 bs->bl.request_alignment = block_size;
2057
2058 if (iscsilun->bl.max_xfer_len) {
2059 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
2060 }
2061
2062 if (max_xfer_len * block_size < INT_MAX) {
2063 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
2064 }
2065
2066 if (iscsilun->lbp.lbpu) {
2067 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) {
2068 bs->bl.max_pdiscard =
2069 iscsilun->bl.max_unmap * iscsilun->block_size;
2070 }
2071 bs->bl.pdiscard_alignment =
2072 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2073 } else {
2074 bs->bl.pdiscard_alignment = iscsilun->block_size;
2075 }
2076
2077 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) {
2078 bs->bl.max_pwrite_zeroes =
2079 iscsilun->bl.max_ws_len * iscsilun->block_size;
2080 }
2081 if (iscsilun->lbp.lbpws) {
2082 bs->bl.pwrite_zeroes_alignment =
2083 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2084 } else {
2085 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
2086 }
2087 if (iscsilun->bl.opt_xfer_len &&
2088 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
2089 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
2090 iscsilun->block_size);
2091 }
2092 }
2093
2094 /* Note that this will not re-establish a connection with an iSCSI target - it
2095 * is effectively a NOP. */
2096 static int iscsi_reopen_prepare(BDRVReopenState *state,
2097 BlockReopenQueue *queue, Error **errp)
2098 {
2099 IscsiLun *iscsilun = state->bs->opaque;
2100
2101 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
2102 error_setg(errp, "Cannot open a write protected LUN as read-write");
2103 return -EACCES;
2104 }
2105 return 0;
2106 }
2107
2108 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
2109 {
2110 IscsiLun *iscsilun = reopen_state->bs->opaque;
2111
2112 /* the cache.direct status might have changed */
2113 if (iscsilun->allocmap != NULL) {
2114 iscsi_allocmap_init(iscsilun, reopen_state->flags);
2115 }
2116 }
2117
2118 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset,
2119 bool exact, PreallocMode prealloc,
2120 BdrvRequestFlags flags, Error **errp)
2121 {
2122 IscsiLun *iscsilun = bs->opaque;
2123 int64_t cur_length;
2124 Error *local_err = NULL;
2125
2126 if (prealloc != PREALLOC_MODE_OFF) {
2127 error_setg(errp, "Unsupported preallocation mode '%s'",
2128 PreallocMode_str(prealloc));
2129 return -ENOTSUP;
2130 }
2131
2132 if (iscsilun->type != TYPE_DISK) {
2133 error_setg(errp, "Cannot resize non-disk iSCSI devices");
2134 return -ENOTSUP;
2135 }
2136
2137 iscsi_readcapacity_sync(iscsilun, &local_err);
2138 if (local_err != NULL) {
2139 error_propagate(errp, local_err);
2140 return -EIO;
2141 }
2142
2143 cur_length = iscsi_getlength(bs);
2144 if (offset != cur_length && exact) {
2145 error_setg(errp, "Cannot resize iSCSI devices");
2146 return -ENOTSUP;
2147 } else if (offset > cur_length) {
2148 error_setg(errp, "Cannot grow iSCSI devices");
2149 return -EINVAL;
2150 }
2151
2152 if (iscsilun->allocmap != NULL) {
2153 iscsi_allocmap_init(iscsilun, bs->open_flags);
2154 }
2155
2156 return 0;
2157 }
2158
2159 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2160 {
2161 IscsiLun *iscsilun = bs->opaque;
2162 bdi->cluster_size = iscsilun->cluster_size;
2163 return 0;
2164 }
2165
2166 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs,
2167 Error **errp)
2168 {
2169 IscsiLun *iscsilun = bs->opaque;
2170 iscsi_allocmap_invalidate(iscsilun);
2171 }
2172
2173 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs,
2174 BdrvChild *src,
2175 uint64_t src_offset,
2176 BdrvChild *dst,
2177 uint64_t dst_offset,
2178 uint64_t bytes,
2179 BdrvRequestFlags read_flags,
2180 BdrvRequestFlags write_flags)
2181 {
2182 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes,
2183 read_flags, write_flags);
2184 }
2185
2186 static struct scsi_task *iscsi_xcopy_task(int param_len)
2187 {
2188 struct scsi_task *task;
2189
2190 task = g_new0(struct scsi_task, 1);
2191
2192 task->cdb[0] = EXTENDED_COPY;
2193 task->cdb[10] = (param_len >> 24) & 0xFF;
2194 task->cdb[11] = (param_len >> 16) & 0xFF;
2195 task->cdb[12] = (param_len >> 8) & 0xFF;
2196 task->cdb[13] = param_len & 0xFF;
2197 task->cdb_size = 16;
2198 task->xfer_dir = SCSI_XFER_WRITE;
2199 task->expxferlen = param_len;
2200
2201 return task;
2202 }
2203
2204 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
2205 {
2206 struct scsi_inquiry_device_designator *dd = lun->dd;
2207
2208 memset(desc, 0, 32);
2209 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */
2210 desc[4] = dd->code_set;
2211 desc[5] = (dd->designator_type & 0xF)
2212 | ((dd->association & 3) << 4);
2213 desc[7] = dd->designator_length;
2214 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20));
2215
2216 desc[28] = 0;
2217 desc[29] = (lun->block_size >> 16) & 0xFF;
2218 desc[30] = (lun->block_size >> 8) & 0xFF;
2219 desc[31] = lun->block_size & 0xFF;
2220 }
2221
2222 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index,
2223 int dst_index)
2224 {
2225 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */
2226 hdr[1] = ((dc << 1) | cat) & 0xFF;
2227 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF;
2228 /* don't account for the first 4 bytes in descriptor header*/
2229 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF;
2230 hdr[4] = (src_index >> 8) & 0xFF;
2231 hdr[5] = src_index & 0xFF;
2232 hdr[6] = (dst_index >> 8) & 0xFF;
2233 hdr[7] = dst_index & 0xFF;
2234 }
2235
2236 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat,
2237 int src_index, int dst_index, int num_blks,
2238 uint64_t src_lba, uint64_t dst_lba)
2239 {
2240 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index);
2241
2242 /* The caller should verify the request size */
2243 assert(num_blks < 65536);
2244 desc[10] = (num_blks >> 8) & 0xFF;
2245 desc[11] = num_blks & 0xFF;
2246 desc[12] = (src_lba >> 56) & 0xFF;
2247 desc[13] = (src_lba >> 48) & 0xFF;
2248 desc[14] = (src_lba >> 40) & 0xFF;
2249 desc[15] = (src_lba >> 32) & 0xFF;
2250 desc[16] = (src_lba >> 24) & 0xFF;
2251 desc[17] = (src_lba >> 16) & 0xFF;
2252 desc[18] = (src_lba >> 8) & 0xFF;
2253 desc[19] = src_lba & 0xFF;
2254 desc[20] = (dst_lba >> 56) & 0xFF;
2255 desc[21] = (dst_lba >> 48) & 0xFF;
2256 desc[22] = (dst_lba >> 40) & 0xFF;
2257 desc[23] = (dst_lba >> 32) & 0xFF;
2258 desc[24] = (dst_lba >> 24) & 0xFF;
2259 desc[25] = (dst_lba >> 16) & 0xFF;
2260 desc[26] = (dst_lba >> 8) & 0xFF;
2261 desc[27] = dst_lba & 0xFF;
2262 }
2263
2264 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str,
2265 int list_id_usage, int prio,
2266 int tgt_desc_len,
2267 int seg_desc_len, int inline_data_len)
2268 {
2269 buf[0] = list_id;
2270 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7);
2271 buf[2] = (tgt_desc_len >> 8) & 0xFF;
2272 buf[3] = tgt_desc_len & 0xFF;
2273 buf[8] = (seg_desc_len >> 24) & 0xFF;
2274 buf[9] = (seg_desc_len >> 16) & 0xFF;
2275 buf[10] = (seg_desc_len >> 8) & 0xFF;
2276 buf[11] = seg_desc_len & 0xFF;
2277 buf[12] = (inline_data_len >> 24) & 0xFF;
2278 buf[13] = (inline_data_len >> 16) & 0xFF;
2279 buf[14] = (inline_data_len >> 8) & 0xFF;
2280 buf[15] = inline_data_len & 0xFF;
2281 }
2282
2283 static void iscsi_xcopy_data(struct iscsi_data *data,
2284 IscsiLun *src, int64_t src_lba,
2285 IscsiLun *dst, int64_t dst_lba,
2286 uint16_t num_blocks)
2287 {
2288 uint8_t *buf;
2289 const int src_offset = XCOPY_DESC_OFFSET;
2290 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE;
2291 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE;
2292
2293 data->size = XCOPY_DESC_OFFSET +
2294 IDENT_DESCR_TGT_DESCR_SIZE * 2 +
2295 XCOPY_BLK2BLK_SEG_DESC_SIZE;
2296 data->data = g_malloc0(data->size);
2297 buf = data->data;
2298
2299 /* Initialise the parameter list header */
2300 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */,
2301 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE,
2302 XCOPY_BLK2BLK_SEG_DESC_SIZE,
2303 0);
2304
2305 /* Initialise CSCD list with one src + one dst descriptor */
2306 iscsi_populate_target_desc(&buf[src_offset], src);
2307 iscsi_populate_target_desc(&buf[dst_offset], dst);
2308
2309 /* Initialise one segment descriptor */
2310 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks,
2311 src_lba, dst_lba);
2312 }
2313
2314 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs,
2315 BdrvChild *src,
2316 uint64_t src_offset,
2317 BdrvChild *dst,
2318 uint64_t dst_offset,
2319 uint64_t bytes,
2320 BdrvRequestFlags read_flags,
2321 BdrvRequestFlags write_flags)
2322 {
2323 IscsiLun *dst_lun = dst->bs->opaque;
2324 IscsiLun *src_lun;
2325 struct IscsiTask iscsi_task;
2326 struct iscsi_data data;
2327 int r = 0;
2328 int block_size;
2329
2330 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) {
2331 return -ENOTSUP;
2332 }
2333 src_lun = src->bs->opaque;
2334
2335 if (!src_lun->dd || !dst_lun->dd) {
2336 return -ENOTSUP;
2337 }
2338 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) {
2339 return -ENOTSUP;
2340 }
2341 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) {
2342 return -ENOTSUP;
2343 }
2344 if (dst_lun->block_size != src_lun->block_size ||
2345 !dst_lun->block_size) {
2346 return -ENOTSUP;
2347 }
2348
2349 block_size = dst_lun->block_size;
2350 if (bytes / block_size > 65535) {
2351 return -ENOTSUP;
2352 }
2353
2354 iscsi_xcopy_data(&data,
2355 src_lun, src_offset / block_size,
2356 dst_lun, dst_offset / block_size,
2357 bytes / block_size);
2358
2359 iscsi_co_init_iscsitask(dst_lun, &iscsi_task);
2360
2361 qemu_mutex_lock(&dst_lun->mutex);
2362 iscsi_task.task = iscsi_xcopy_task(data.size);
2363 retry:
2364 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun,
2365 iscsi_task.task, iscsi_co_generic_cb,
2366 &data,
2367 &iscsi_task) != 0) {
2368 r = -EIO;
2369 goto out_unlock;
2370 }
2371
2372 iscsi_co_wait_for_task(&iscsi_task, dst_lun);
2373
2374 if (iscsi_task.do_retry) {
2375 iscsi_task.complete = 0;
2376 goto retry;
2377 }
2378
2379 if (iscsi_task.status != SCSI_STATUS_GOOD) {
2380 r = iscsi_task.err_code;
2381 goto out_unlock;
2382 }
2383
2384 out_unlock:
2385
2386 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r);
2387 g_free(iscsi_task.task);
2388 qemu_mutex_unlock(&dst_lun->mutex);
2389 g_free(iscsi_task.err_str);
2390 return r;
2391 }
2392
2393
2394 static const char *const iscsi_strong_runtime_opts[] = {
2395 "transport",
2396 "portal",
2397 "target",
2398 "user",
2399 "password",
2400 "password-secret",
2401 "lun",
2402 "initiator-name",
2403 "header-digest",
2404
2405 NULL
2406 };
2407
2408 static BlockDriver bdrv_iscsi = {
2409 .format_name = "iscsi",
2410 .protocol_name = "iscsi",
2411
2412 .instance_size = sizeof(IscsiLun),
2413 .bdrv_parse_filename = iscsi_parse_filename,
2414 .bdrv_file_open = iscsi_open,
2415 .bdrv_close = iscsi_close,
2416 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2417 .create_opts = &bdrv_create_opts_simple,
2418 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2419 .bdrv_reopen_commit = iscsi_reopen_commit,
2420 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2421
2422 .bdrv_getlength = iscsi_getlength,
2423 .bdrv_get_info = iscsi_get_info,
2424 .bdrv_co_truncate = iscsi_co_truncate,
2425 .bdrv_refresh_limits = iscsi_refresh_limits,
2426
2427 .bdrv_co_block_status = iscsi_co_block_status,
2428 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2429 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2430 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2431 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2432 .bdrv_co_readv = iscsi_co_readv,
2433 .bdrv_co_writev = iscsi_co_writev,
2434 .bdrv_co_flush_to_disk = iscsi_co_flush,
2435
2436 #ifdef __linux__
2437 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2438 #endif
2439
2440 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2441 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2442
2443 .strong_runtime_opts = iscsi_strong_runtime_opts,
2444 };
2445
2446 #if LIBISCSI_API_VERSION >= (20160603)
2447 static BlockDriver bdrv_iser = {
2448 .format_name = "iser",
2449 .protocol_name = "iser",
2450
2451 .instance_size = sizeof(IscsiLun),
2452 .bdrv_parse_filename = iscsi_parse_filename,
2453 .bdrv_file_open = iscsi_open,
2454 .bdrv_close = iscsi_close,
2455 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2456 .create_opts = &bdrv_create_opts_simple,
2457 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2458 .bdrv_reopen_commit = iscsi_reopen_commit,
2459 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2460
2461 .bdrv_getlength = iscsi_getlength,
2462 .bdrv_get_info = iscsi_get_info,
2463 .bdrv_co_truncate = iscsi_co_truncate,
2464 .bdrv_refresh_limits = iscsi_refresh_limits,
2465
2466 .bdrv_co_block_status = iscsi_co_block_status,
2467 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2468 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2469 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2470 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2471 .bdrv_co_readv = iscsi_co_readv,
2472 .bdrv_co_writev = iscsi_co_writev,
2473 .bdrv_co_flush_to_disk = iscsi_co_flush,
2474
2475 #ifdef __linux__
2476 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2477 #endif
2478
2479 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2480 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2481
2482 .strong_runtime_opts = iscsi_strong_runtime_opts,
2483 };
2484 #endif
2485
2486 static void iscsi_block_init(void)
2487 {
2488 bdrv_register(&bdrv_iscsi);
2489 #if LIBISCSI_API_VERSION >= (20160603)
2490 bdrv_register(&bdrv_iser);
2491 #endif
2492 }
2493
2494 block_init(iscsi_block_init);
armbru's QEMU hackery