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block: Change bdrv_{pread,pwrite,pwrite_sync}() param order
[qemu/ar7.git] / block / iscsi.c
blobd707d0b3543583eb6e917803a9bc295c3a019da6
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 "sysemu/sysemu.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, 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, int64_t bytes,
431 IscsiLun *iscsilun)
432 {
433 if (offset % iscsilun->block_size || bytes % iscsilun->block_size) {
434 error_report("iSCSI misaligned request: "
435 "iscsilun->block_size %u, offset %" PRIi64
436 ", bytes %" PRIi64,
437 iscsilun->block_size, offset, bytes);
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 out_unlock:
785 qemu_mutex_unlock(&iscsilun->mutex);
786 g_free(iTask.err_str);
787 out:
788 if (iTask.task != NULL) {
789 scsi_free_scsi_task(iTask.task);
790 }
791 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) {
792 *file = bs;
793 }
794 return ret;
795 }
796
797 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
798 int64_t sector_num, int nb_sectors,
799 QEMUIOVector *iov)
800 {
801 IscsiLun *iscsilun = bs->opaque;
802 struct IscsiTask iTask;
803 uint64_t lba;
804 uint32_t num_sectors;
805 int r = 0;
806
807 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
808 return -EINVAL;
809 }
810
811 if (bs->bl.max_transfer) {
812 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
813 }
814
815 /* if cache.direct is off and we have a valid entry in our allocation map
816 * we can skip checking the block status and directly return zeroes if
817 * the request falls within an unallocated area */
818 if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
819 nb_sectors * BDRV_SECTOR_SIZE) &&
820 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
821 nb_sectors * BDRV_SECTOR_SIZE)) {
822 qemu_iovec_memset(iov, 0, 0x00, iov->size);
823 return 0;
824 }
825
826 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
827 !iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
828 nb_sectors * BDRV_SECTOR_SIZE) &&
829 !iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
830 nb_sectors * BDRV_SECTOR_SIZE)) {
831 int64_t pnum;
832 /* check the block status from the beginning of the cluster
833 * containing the start sector */
834 int64_t head;
835 int ret;
836
837 assert(iscsilun->cluster_size);
838 head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size;
839 ret = iscsi_co_block_status(bs, true,
840 sector_num * BDRV_SECTOR_SIZE - head,
841 BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL);
842 if (ret < 0) {
843 return ret;
844 }
845 /* if the whole request falls into an unallocated area we can avoid
846 * reading and directly return zeroes instead */
847 if (ret & BDRV_BLOCK_ZERO &&
848 pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) {
849 qemu_iovec_memset(iov, 0, 0x00, iov->size);
850 return 0;
851 }
852 }
853
854 lba = sector_qemu2lun(sector_num, iscsilun);
855 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
856
857 iscsi_co_init_iscsitask(iscsilun, &iTask);
858 qemu_mutex_lock(&iscsilun->mutex);
859 retry:
860 if (iscsilun->use_16_for_rw) {
861 #if LIBISCSI_API_VERSION >= (20160603)
862 iTask.task = iscsi_read16_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
863 num_sectors * iscsilun->block_size,
864 iscsilun->block_size, 0, 0, 0, 0, 0,
865 iscsi_co_generic_cb, &iTask,
866 (struct scsi_iovec *)iov->iov, iov->niov);
867 } else {
868 iTask.task = iscsi_read10_iov_task(iscsilun->iscsi, iscsilun->lun, lba,
869 num_sectors * iscsilun->block_size,
870 iscsilun->block_size,
871 0, 0, 0, 0, 0,
872 iscsi_co_generic_cb, &iTask,
873 (struct scsi_iovec *)iov->iov, iov->niov);
874 }
875 #else
876 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
877 num_sectors * iscsilun->block_size,
878 iscsilun->block_size, 0, 0, 0, 0, 0,
879 iscsi_co_generic_cb, &iTask);
880 } else {
881 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
882 num_sectors * iscsilun->block_size,
883 iscsilun->block_size,
884 0, 0, 0, 0, 0,
885 iscsi_co_generic_cb, &iTask);
886 }
887 #endif
888 if (iTask.task == NULL) {
889 qemu_mutex_unlock(&iscsilun->mutex);
890 return -ENOMEM;
891 }
892 #if LIBISCSI_API_VERSION < (20160603)
893 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
894 #endif
895
896 iscsi_co_wait_for_task(&iTask, iscsilun);
897 if (iTask.task != NULL) {
898 scsi_free_scsi_task(iTask.task);
899 iTask.task = NULL;
900 }
901
902 if (iTask.do_retry) {
903 iTask.complete = 0;
904 goto retry;
905 }
906
907 if (iTask.status != SCSI_STATUS_GOOD) {
908 error_report("iSCSI READ10/16 failed at lba %" PRIu64 ": %s",
909 lba, iTask.err_str);
910 r = iTask.err_code;
911 }
912
913 qemu_mutex_unlock(&iscsilun->mutex);
914 g_free(iTask.err_str);
915 return r;
916 }
917
918 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
919 {
920 IscsiLun *iscsilun = bs->opaque;
921 struct IscsiTask iTask;
922 int r = 0;
923
924 iscsi_co_init_iscsitask(iscsilun, &iTask);
925 qemu_mutex_lock(&iscsilun->mutex);
926 retry:
927 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
928 0, iscsi_co_generic_cb, &iTask) == NULL) {
929 qemu_mutex_unlock(&iscsilun->mutex);
930 return -ENOMEM;
931 }
932
933 iscsi_co_wait_for_task(&iTask, iscsilun);
934
935 if (iTask.task != NULL) {
936 scsi_free_scsi_task(iTask.task);
937 iTask.task = NULL;
938 }
939
940 if (iTask.do_retry) {
941 iTask.complete = 0;
942 goto retry;
943 }
944
945 if (iTask.status != SCSI_STATUS_GOOD) {
946 error_report("iSCSI SYNCHRONIZECACHE10 failed: %s", iTask.err_str);
947 r = iTask.err_code;
948 }
949
950 qemu_mutex_unlock(&iscsilun->mutex);
951 g_free(iTask.err_str);
952 return r;
953 }
954
955 #ifdef __linux__
956 /* Called (via iscsi_service) with QemuMutex held. */
957 static void
958 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
959 void *command_data, void *opaque)
960 {
961 IscsiAIOCB *acb = opaque;
962
963 if (status == SCSI_STATUS_CANCELLED) {
964 if (!acb->bh) {
965 acb->status = -ECANCELED;
966 iscsi_schedule_bh(acb);
967 }
968 return;
969 }
970
971 acb->status = 0;
972 if (status < 0) {
973 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
974 iscsi_get_error(iscsi));
975 acb->status = -iscsi_translate_sense(&acb->task->sense);
976 }
977
978 acb->ioh->driver_status = 0;
979 acb->ioh->host_status = 0;
980 acb->ioh->resid = 0;
981 acb->ioh->status = status;
982
983 #define SG_ERR_DRIVER_SENSE 0x08
984
985 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
986 int ss;
987
988 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
989
990 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
991 ss = MIN(acb->ioh->mx_sb_len, acb->ioh->sb_len_wr);
992 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
993 }
994
995 iscsi_schedule_bh(acb);
996 }
997
998 static void iscsi_ioctl_bh_completion(void *opaque)
999 {
1000 IscsiAIOCB *acb = opaque;
1001
1002 qemu_bh_delete(acb->bh);
1003 acb->common.cb(acb->common.opaque, acb->ret);
1004 qemu_aio_unref(acb);
1005 }
1006
1007 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
1008 {
1009 BlockDriverState *bs = acb->common.bs;
1010 IscsiLun *iscsilun = bs->opaque;
1011 int ret = 0;
1012
1013 switch (req) {
1014 case SG_GET_VERSION_NUM:
1015 *(int *)buf = 30000;
1016 break;
1017 case SG_GET_SCSI_ID:
1018 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
1019 break;
1020 default:
1021 ret = -EINVAL;
1022 }
1023 assert(!acb->bh);
1024 acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
1025 iscsi_ioctl_bh_completion, acb);
1026 acb->ret = ret;
1027 qemu_bh_schedule(acb->bh);
1028 }
1029
1030 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
1031 unsigned long int req, void *buf,
1032 BlockCompletionFunc *cb, void *opaque)
1033 {
1034 IscsiLun *iscsilun = bs->opaque;
1035 struct iscsi_context *iscsi = iscsilun->iscsi;
1036 struct iscsi_data data;
1037 IscsiAIOCB *acb;
1038
1039 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
1040
1041 acb->iscsilun = iscsilun;
1042 acb->bh = NULL;
1043 acb->status = -EINPROGRESS;
1044 acb->ioh = buf;
1045 acb->cancelled = false;
1046
1047 if (req != SG_IO) {
1048 iscsi_ioctl_handle_emulated(acb, req, buf);
1049 return &acb->common;
1050 }
1051
1052 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
1053 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
1054 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
1055 qemu_aio_unref(acb);
1056 return NULL;
1057 }
1058
1059 acb->task = malloc(sizeof(struct scsi_task));
1060 if (acb->task == NULL) {
1061 error_report("iSCSI: Failed to allocate task for scsi command. %s",
1062 iscsi_get_error(iscsi));
1063 qemu_aio_unref(acb);
1064 return NULL;
1065 }
1066 memset(acb->task, 0, sizeof(struct scsi_task));
1067
1068 switch (acb->ioh->dxfer_direction) {
1069 case SG_DXFER_TO_DEV:
1070 acb->task->xfer_dir = SCSI_XFER_WRITE;
1071 break;
1072 case SG_DXFER_FROM_DEV:
1073 acb->task->xfer_dir = SCSI_XFER_READ;
1074 break;
1075 default:
1076 acb->task->xfer_dir = SCSI_XFER_NONE;
1077 break;
1078 }
1079
1080 acb->task->cdb_size = acb->ioh->cmd_len;
1081 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
1082 acb->task->expxferlen = acb->ioh->dxfer_len;
1083
1084 data.size = 0;
1085 qemu_mutex_lock(&iscsilun->mutex);
1086 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
1087 if (acb->ioh->iovec_count == 0) {
1088 data.data = acb->ioh->dxferp;
1089 data.size = acb->ioh->dxfer_len;
1090 } else {
1091 scsi_task_set_iov_out(acb->task,
1092 (struct scsi_iovec *) acb->ioh->dxferp,
1093 acb->ioh->iovec_count);
1094 }
1095 }
1096
1097 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1098 iscsi_aio_ioctl_cb,
1099 (data.size > 0) ? &data : NULL,
1100 acb) != 0) {
1101 qemu_mutex_unlock(&iscsilun->mutex);
1102 scsi_free_scsi_task(acb->task);
1103 qemu_aio_unref(acb);
1104 return NULL;
1105 }
1106
1107 /* tell libiscsi to read straight into the buffer we got from ioctl */
1108 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1109 if (acb->ioh->iovec_count == 0) {
1110 scsi_task_add_data_in_buffer(acb->task,
1111 acb->ioh->dxfer_len,
1112 acb->ioh->dxferp);
1113 } else {
1114 scsi_task_set_iov_in(acb->task,
1115 (struct scsi_iovec *) acb->ioh->dxferp,
1116 acb->ioh->iovec_count);
1117 }
1118 }
1119
1120 iscsi_set_events(iscsilun);
1121 qemu_mutex_unlock(&iscsilun->mutex);
1122
1123 return &acb->common;
1124 }
1125
1126 #endif
1127
1128 static int64_t
1129 iscsi_getlength(BlockDriverState *bs)
1130 {
1131 IscsiLun *iscsilun = bs->opaque;
1132 int64_t len;
1133
1134 len = iscsilun->num_blocks;
1135 len *= iscsilun->block_size;
1136
1137 return len;
1138 }
1139
1140 static int
1141 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset,
1142 int64_t bytes)
1143 {
1144 IscsiLun *iscsilun = bs->opaque;
1145 struct IscsiTask iTask;
1146 struct unmap_list list;
1147 int r = 0;
1148
1149 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1150 return -ENOTSUP;
1151 }
1152
1153 if (!iscsilun->lbp.lbpu) {
1154 /* UNMAP is not supported by the target */
1155 return 0;
1156 }
1157
1158 /*
1159 * We don't want to overflow list.num which is uint32_t.
1160 * We rely on our max_pdiscard.
1161 */
1162 assert(bytes / iscsilun->block_size <= UINT32_MAX);
1163
1164 list.lba = offset / iscsilun->block_size;
1165 list.num = bytes / iscsilun->block_size;
1166
1167 iscsi_co_init_iscsitask(iscsilun, &iTask);
1168 qemu_mutex_lock(&iscsilun->mutex);
1169 retry:
1170 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1171 iscsi_co_generic_cb, &iTask) == NULL) {
1172 r = -ENOMEM;
1173 goto out_unlock;
1174 }
1175
1176 iscsi_co_wait_for_task(&iTask, iscsilun);
1177
1178 if (iTask.task != NULL) {
1179 scsi_free_scsi_task(iTask.task);
1180 iTask.task = NULL;
1181 }
1182
1183 if (iTask.do_retry) {
1184 iTask.complete = 0;
1185 goto retry;
1186 }
1187
1188 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1189
1190 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1191 /* the target might fail with a check condition if it
1192 is not happy with the alignment of the UNMAP request
1193 we silently fail in this case */
1194 goto out_unlock;
1195 }
1196
1197 if (iTask.status != SCSI_STATUS_GOOD) {
1198 error_report("iSCSI UNMAP failed at lba %" PRIu64 ": %s",
1199 list.lba, iTask.err_str);
1200 r = iTask.err_code;
1201 goto out_unlock;
1202 }
1203
1204 out_unlock:
1205 qemu_mutex_unlock(&iscsilun->mutex);
1206 g_free(iTask.err_str);
1207 return r;
1208 }
1209
1210 static int
1211 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1212 int64_t bytes, BdrvRequestFlags flags)
1213 {
1214 IscsiLun *iscsilun = bs->opaque;
1215 struct IscsiTask iTask;
1216 uint64_t lba;
1217 uint64_t nb_blocks;
1218 bool use_16_for_ws = iscsilun->use_16_for_rw;
1219 int r = 0;
1220
1221 if (!is_byte_request_lun_aligned(offset, bytes, iscsilun)) {
1222 return -ENOTSUP;
1223 }
1224
1225 if (flags & BDRV_REQ_MAY_UNMAP) {
1226 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1227 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1228 use_16_for_ws = true;
1229 }
1230 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1231 /* WRITESAME16 with UNMAP is not supported by the target,
1232 * fall back and try WRITESAME10/16 without UNMAP */
1233 flags &= ~BDRV_REQ_MAY_UNMAP;
1234 use_16_for_ws = iscsilun->use_16_for_rw;
1235 }
1236 }
1237
1238 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1239 /* WRITESAME without UNMAP is not supported by the target */
1240 return -ENOTSUP;
1241 }
1242
1243 lba = offset / iscsilun->block_size;
1244 nb_blocks = bytes / iscsilun->block_size;
1245
1246 if (iscsilun->zeroblock == NULL) {
1247 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1248 if (iscsilun->zeroblock == NULL) {
1249 return -ENOMEM;
1250 }
1251 }
1252
1253 qemu_mutex_lock(&iscsilun->mutex);
1254 iscsi_co_init_iscsitask(iscsilun, &iTask);
1255 retry:
1256 if (use_16_for_ws) {
1257 /*
1258 * iscsi_writesame16_task num_blocks argument is uint32_t. We rely here
1259 * on our max_pwrite_zeroes limit.
1260 */
1261 assert(nb_blocks <= UINT32_MAX);
1262 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1263 iscsilun->zeroblock, iscsilun->block_size,
1264 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1265 0, 0, iscsi_co_generic_cb, &iTask);
1266 } else {
1267 /*
1268 * iscsi_writesame10_task num_blocks argument is uint16_t. We rely here
1269 * on our max_pwrite_zeroes limit.
1270 */
1271 assert(nb_blocks <= UINT16_MAX);
1272 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1273 iscsilun->zeroblock, iscsilun->block_size,
1274 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1275 0, 0, iscsi_co_generic_cb, &iTask);
1276 }
1277 if (iTask.task == NULL) {
1278 qemu_mutex_unlock(&iscsilun->mutex);
1279 return -ENOMEM;
1280 }
1281
1282 iscsi_co_wait_for_task(&iTask, iscsilun);
1283
1284 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1285 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1286 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1287 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1288 /* WRITE SAME is not supported by the target */
1289 iscsilun->has_write_same = false;
1290 scsi_free_scsi_task(iTask.task);
1291 r = -ENOTSUP;
1292 goto out_unlock;
1293 }
1294
1295 if (iTask.task != NULL) {
1296 scsi_free_scsi_task(iTask.task);
1297 iTask.task = NULL;
1298 }
1299
1300 if (iTask.do_retry) {
1301 iTask.complete = 0;
1302 goto retry;
1303 }
1304
1305 if (iTask.status != SCSI_STATUS_GOOD) {
1306 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1307 error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s",
1308 lba, iTask.err_str);
1309 r = iTask.err_code;
1310 goto out_unlock;
1311 }
1312
1313 if (flags & BDRV_REQ_MAY_UNMAP) {
1314 iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
1315 } else {
1316 iscsi_allocmap_set_allocated(iscsilun, offset, bytes);
1317 }
1318
1319 out_unlock:
1320 qemu_mutex_unlock(&iscsilun->mutex);
1321 g_free(iTask.err_str);
1322 return r;
1323 }
1324
1325 static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
1326 Error **errp)
1327 {
1328 const char *user = NULL;
1329 const char *password = NULL;
1330 const char *secretid;
1331 char *secret = NULL;
1332
1333 user = qemu_opt_get(opts, "user");
1334 if (!user) {
1335 return;
1336 }
1337
1338 secretid = qemu_opt_get(opts, "password-secret");
1339 password = qemu_opt_get(opts, "password");
1340 if (secretid && password) {
1341 error_setg(errp, "'password' and 'password-secret' properties are "
1342 "mutually exclusive");
1343 return;
1344 }
1345 if (secretid) {
1346 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1347 if (!secret) {
1348 return;
1349 }
1350 password = secret;
1351 } else if (!password) {
1352 error_setg(errp, "CHAP username specified but no password was given");
1353 return;
1354 }
1355
1356 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1357 error_setg(errp, "Failed to set initiator username and password");
1358 }
1359
1360 g_free(secret);
1361 }
1362
1363 static void apply_header_digest(struct iscsi_context *iscsi, QemuOpts *opts,
1364 Error **errp)
1365 {
1366 const char *digest = NULL;
1367
1368 digest = qemu_opt_get(opts, "header-digest");
1369 if (!digest) {
1370 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1371 } else if (!strcmp(digest, "crc32c")) {
1372 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1373 } else if (!strcmp(digest, "none")) {
1374 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1375 } else if (!strcmp(digest, "crc32c-none")) {
1376 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1377 } else if (!strcmp(digest, "none-crc32c")) {
1378 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1379 } else {
1380 error_setg(errp, "Invalid header-digest setting : %s", digest);
1381 }
1382 }
1383
1384 static char *get_initiator_name(QemuOpts *opts)
1385 {
1386 const char *name;
1387 char *iscsi_name;
1388 UuidInfo *uuid_info;
1389
1390 name = qemu_opt_get(opts, "initiator-name");
1391 if (name) {
1392 return g_strdup(name);
1393 }
1394
1395 uuid_info = qmp_query_uuid(NULL);
1396 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1397 name = qemu_get_vm_name();
1398 } else {
1399 name = uuid_info->UUID;
1400 }
1401 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1402 name ? ":" : "", name ? name : "");
1403 qapi_free_UuidInfo(uuid_info);
1404 return iscsi_name;
1405 }
1406
1407 static void iscsi_nop_timed_event(void *opaque)
1408 {
1409 IscsiLun *iscsilun = opaque;
1410
1411 QEMU_LOCK_GUARD(&iscsilun->mutex);
1412 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1413 error_report("iSCSI: NOP timeout. Reconnecting...");
1414 iscsilun->request_timed_out = true;
1415 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1416 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1417 return;
1418 }
1419
1420 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1421 iscsi_set_events(iscsilun);
1422 }
1423
1424 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1425 {
1426 struct scsi_task *task = NULL;
1427 struct scsi_readcapacity10 *rc10 = NULL;
1428 struct scsi_readcapacity16 *rc16 = NULL;
1429 int retries = ISCSI_CMD_RETRIES;
1430
1431 do {
1432 if (task != NULL) {
1433 scsi_free_scsi_task(task);
1434 task = NULL;
1435 }
1436
1437 switch (iscsilun->type) {
1438 case TYPE_DISK:
1439 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1440 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1441 rc16 = scsi_datain_unmarshall(task);
1442 if (rc16 == NULL) {
1443 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1444 } else {
1445 iscsilun->block_size = rc16->block_length;
1446 iscsilun->num_blocks = rc16->returned_lba + 1;
1447 iscsilun->lbpme = !!rc16->lbpme;
1448 iscsilun->lbprz = !!rc16->lbprz;
1449 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1450 }
1451 break;
1452 }
1453 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1454 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1455 break;
1456 }
1457 /* Fall through and try READ CAPACITY(10) instead. */
1458 case TYPE_ROM:
1459 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1460 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1461 rc10 = scsi_datain_unmarshall(task);
1462 if (rc10 == NULL) {
1463 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1464 } else {
1465 iscsilun->block_size = rc10->block_size;
1466 if (rc10->lba == 0) {
1467 /* blank disk loaded */
1468 iscsilun->num_blocks = 0;
1469 } else {
1470 iscsilun->num_blocks = rc10->lba + 1;
1471 }
1472 }
1473 }
1474 break;
1475 default:
1476 return;
1477 }
1478 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1479 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1480 && retries-- > 0);
1481
1482 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1483 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1484 } else if (!iscsilun->block_size ||
1485 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1486 error_setg(errp, "iSCSI: the target returned an invalid "
1487 "block size of %d.", iscsilun->block_size);
1488 }
1489 if (task) {
1490 scsi_free_scsi_task(task);
1491 }
1492 }
1493
1494 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1495 int evpd, int pc, void **inq, Error **errp)
1496 {
1497 int full_size;
1498 struct scsi_task *task = NULL;
1499 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1500 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1501 goto fail;
1502 }
1503 full_size = scsi_datain_getfullsize(task);
1504 if (full_size > task->datain.size) {
1505 scsi_free_scsi_task(task);
1506
1507 /* we need more data for the full list */
1508 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1509 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1510 goto fail;
1511 }
1512 }
1513
1514 *inq = scsi_datain_unmarshall(task);
1515 if (*inq == NULL) {
1516 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1517 goto fail_with_err;
1518 }
1519
1520 return task;
1521
1522 fail:
1523 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1524 iscsi_get_error(iscsi));
1525 fail_with_err:
1526 if (task != NULL) {
1527 scsi_free_scsi_task(task);
1528 }
1529 return NULL;
1530 }
1531
1532 static void iscsi_detach_aio_context(BlockDriverState *bs)
1533 {
1534 IscsiLun *iscsilun = bs->opaque;
1535
1536 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1537 false, NULL, NULL, NULL, NULL, NULL);
1538 iscsilun->events = 0;
1539
1540 if (iscsilun->nop_timer) {
1541 timer_free(iscsilun->nop_timer);
1542 iscsilun->nop_timer = NULL;
1543 }
1544 if (iscsilun->event_timer) {
1545 timer_free(iscsilun->event_timer);
1546 iscsilun->event_timer = NULL;
1547 }
1548 }
1549
1550 static void iscsi_attach_aio_context(BlockDriverState *bs,
1551 AioContext *new_context)
1552 {
1553 IscsiLun *iscsilun = bs->opaque;
1554
1555 iscsilun->aio_context = new_context;
1556 iscsi_set_events(iscsilun);
1557
1558 /* Set up a timer for sending out iSCSI NOPs */
1559 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1560 QEMU_CLOCK_REALTIME, SCALE_MS,
1561 iscsi_nop_timed_event, iscsilun);
1562 timer_mod(iscsilun->nop_timer,
1563 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1564
1565 /* Set up a timer for periodic calls to iscsi_set_events and to
1566 * scan for command timeout */
1567 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1568 QEMU_CLOCK_REALTIME, SCALE_MS,
1569 iscsi_timed_check_events, iscsilun);
1570 timer_mod(iscsilun->event_timer,
1571 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1572 }
1573
1574 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1575 {
1576 struct scsi_task *task;
1577 struct scsi_mode_sense *ms = NULL;
1578 iscsilun->write_protected = false;
1579 iscsilun->dpofua = false;
1580
1581 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1582 1, SCSI_MODESENSE_PC_CURRENT,
1583 0x3F, 0, 255);
1584 if (task == NULL) {
1585 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1586 iscsi_get_error(iscsilun->iscsi));
1587 goto out;
1588 }
1589
1590 if (task->status != SCSI_STATUS_GOOD) {
1591 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1592 goto out;
1593 }
1594 ms = scsi_datain_unmarshall(task);
1595 if (!ms) {
1596 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1597 iscsi_get_error(iscsilun->iscsi));
1598 goto out;
1599 }
1600 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1601 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1602
1603 out:
1604 if (task) {
1605 scsi_free_scsi_task(task);
1606 }
1607 }
1608
1609 static void iscsi_parse_iscsi_option(const char *target, QDict *options)
1610 {
1611 QemuOptsList *list;
1612 QemuOpts *opts;
1613 const char *user, *password, *password_secret, *initiator_name,
1614 *header_digest, *timeout;
1615
1616 list = qemu_find_opts("iscsi");
1617 if (!list) {
1618 return;
1619 }
1620
1621 opts = qemu_opts_find(list, target);
1622 if (opts == NULL) {
1623 opts = QTAILQ_FIRST(&list->head);
1624 if (!opts) {
1625 return;
1626 }
1627 }
1628
1629 user = qemu_opt_get(opts, "user");
1630 if (user) {
1631 qdict_set_default_str(options, "user", user);
1632 }
1633
1634 password = qemu_opt_get(opts, "password");
1635 if (password) {
1636 qdict_set_default_str(options, "password", password);
1637 }
1638
1639 password_secret = qemu_opt_get(opts, "password-secret");
1640 if (password_secret) {
1641 qdict_set_default_str(options, "password-secret", password_secret);
1642 }
1643
1644 initiator_name = qemu_opt_get(opts, "initiator-name");
1645 if (initiator_name) {
1646 qdict_set_default_str(options, "initiator-name", initiator_name);
1647 }
1648
1649 header_digest = qemu_opt_get(opts, "header-digest");
1650 if (header_digest) {
1651 /* -iscsi takes upper case values, but QAPI only supports lower case
1652 * enum constant names, so we have to convert here. */
1653 char *qapi_value = g_ascii_strdown(header_digest, -1);
1654 qdict_set_default_str(options, "header-digest", qapi_value);
1655 g_free(qapi_value);
1656 }
1657
1658 timeout = qemu_opt_get(opts, "timeout");
1659 if (timeout) {
1660 qdict_set_default_str(options, "timeout", timeout);
1661 }
1662 }
1663
1664 /*
1665 * We support iscsi url's on the form
1666 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1667 */
1668 static void iscsi_parse_filename(const char *filename, QDict *options,
1669 Error **errp)
1670 {
1671 struct iscsi_url *iscsi_url;
1672 const char *transport_name;
1673 char *lun_str;
1674
1675 iscsi_url = iscsi_parse_full_url(NULL, filename);
1676 if (iscsi_url == NULL) {
1677 error_setg(errp, "Failed to parse URL : %s", filename);
1678 return;
1679 }
1680
1681 #if LIBISCSI_API_VERSION >= (20160603)
1682 switch (iscsi_url->transport) {
1683 case TCP_TRANSPORT:
1684 transport_name = "tcp";
1685 break;
1686 case ISER_TRANSPORT:
1687 transport_name = "iser";
1688 break;
1689 default:
1690 error_setg(errp, "Unknown transport type (%d)",
1691 iscsi_url->transport);
1692 return;
1693 }
1694 #else
1695 transport_name = "tcp";
1696 #endif
1697
1698 qdict_set_default_str(options, "transport", transport_name);
1699 qdict_set_default_str(options, "portal", iscsi_url->portal);
1700 qdict_set_default_str(options, "target", iscsi_url->target);
1701
1702 lun_str = g_strdup_printf("%d", iscsi_url->lun);
1703 qdict_set_default_str(options, "lun", lun_str);
1704 g_free(lun_str);
1705
1706 /* User/password from -iscsi take precedence over those from the URL */
1707 iscsi_parse_iscsi_option(iscsi_url->target, options);
1708
1709 if (iscsi_url->user[0] != '\0') {
1710 qdict_set_default_str(options, "user", iscsi_url->user);
1711 qdict_set_default_str(options, "password", iscsi_url->passwd);
1712 }
1713
1714 iscsi_destroy_url(iscsi_url);
1715 }
1716
1717 static QemuOptsList runtime_opts = {
1718 .name = "iscsi",
1719 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1720 .desc = {
1721 {
1722 .name = "transport",
1723 .type = QEMU_OPT_STRING,
1724 },
1725 {
1726 .name = "portal",
1727 .type = QEMU_OPT_STRING,
1728 },
1729 {
1730 .name = "target",
1731 .type = QEMU_OPT_STRING,
1732 },
1733 {
1734 .name = "user",
1735 .type = QEMU_OPT_STRING,
1736 },
1737 {
1738 .name = "password",
1739 .type = QEMU_OPT_STRING,
1740 },
1741 {
1742 .name = "password-secret",
1743 .type = QEMU_OPT_STRING,
1744 },
1745 {
1746 .name = "lun",
1747 .type = QEMU_OPT_NUMBER,
1748 },
1749 {
1750 .name = "initiator-name",
1751 .type = QEMU_OPT_STRING,
1752 },
1753 {
1754 .name = "header-digest",
1755 .type = QEMU_OPT_STRING,
1756 },
1757 {
1758 .name = "timeout",
1759 .type = QEMU_OPT_NUMBER,
1760 },
1761 { /* end of list */ }
1762 },
1763 };
1764
1765 static void iscsi_save_designator(IscsiLun *lun,
1766 struct scsi_inquiry_device_identification *inq_di)
1767 {
1768 struct scsi_inquiry_device_designator *desig, *copy = NULL;
1769
1770 for (desig = inq_di->designators; desig; desig = desig->next) {
1771 if (desig->association ||
1772 desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) {
1773 continue;
1774 }
1775 /* NAA works better than T10 vendor ID based designator. */
1776 if (!copy || copy->designator_type < desig->designator_type) {
1777 copy = desig;
1778 }
1779 }
1780 if (copy) {
1781 lun->dd = g_new(struct scsi_inquiry_device_designator, 1);
1782 *lun->dd = *copy;
1783 lun->dd->next = NULL;
1784 lun->dd->designator = g_malloc(copy->designator_length);
1785 memcpy(lun->dd->designator, copy->designator, copy->designator_length);
1786 }
1787 }
1788
1789 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1790 Error **errp)
1791 {
1792 IscsiLun *iscsilun = bs->opaque;
1793 struct iscsi_context *iscsi = NULL;
1794 struct scsi_task *task = NULL;
1795 struct scsi_inquiry_standard *inq = NULL;
1796 struct scsi_inquiry_supported_pages *inq_vpd;
1797 char *initiator_name = NULL;
1798 QemuOpts *opts;
1799 Error *local_err = NULL;
1800 const char *transport_name, *portal, *target;
1801 #if LIBISCSI_API_VERSION >= (20160603)
1802 enum iscsi_transport_type transport;
1803 #endif
1804 int i, ret = 0, timeout = 0, lun;
1805
1806 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1807 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
1808 ret = -EINVAL;
1809 goto out;
1810 }
1811
1812 transport_name = qemu_opt_get(opts, "transport");
1813 portal = qemu_opt_get(opts, "portal");
1814 target = qemu_opt_get(opts, "target");
1815 lun = qemu_opt_get_number(opts, "lun", 0);
1816
1817 if (!transport_name || !portal || !target) {
1818 error_setg(errp, "Need all of transport, portal and target options");
1819 ret = -EINVAL;
1820 goto out;
1821 }
1822
1823 if (!strcmp(transport_name, "tcp")) {
1824 #if LIBISCSI_API_VERSION >= (20160603)
1825 transport = TCP_TRANSPORT;
1826 } else if (!strcmp(transport_name, "iser")) {
1827 transport = ISER_TRANSPORT;
1828 #else
1829 /* TCP is what older libiscsi versions always use */
1830 #endif
1831 } else {
1832 error_setg(errp, "Unknown transport: %s", transport_name);
1833 ret = -EINVAL;
1834 goto out;
1835 }
1836
1837 memset(iscsilun, 0, sizeof(IscsiLun));
1838
1839 initiator_name = get_initiator_name(opts);
1840
1841 iscsi = iscsi_create_context(initiator_name);
1842 if (iscsi == NULL) {
1843 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1844 ret = -ENOMEM;
1845 goto out;
1846 }
1847 #if LIBISCSI_API_VERSION >= (20160603)
1848 if (iscsi_init_transport(iscsi, transport)) {
1849 error_setg(errp, ("Error initializing transport."));
1850 ret = -EINVAL;
1851 goto out;
1852 }
1853 #endif
1854 if (iscsi_set_targetname(iscsi, target)) {
1855 error_setg(errp, "iSCSI: Failed to set target name.");
1856 ret = -EINVAL;
1857 goto out;
1858 }
1859
1860 /* check if we got CHAP username/password via the options */
1861 apply_chap(iscsi, opts, &local_err);
1862 if (local_err != NULL) {
1863 error_propagate(errp, local_err);
1864 ret = -EINVAL;
1865 goto out;
1866 }
1867
1868 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1869 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1870 ret = -EINVAL;
1871 goto out;
1872 }
1873
1874 /* check if we got HEADER_DIGEST via the options */
1875 apply_header_digest(iscsi, opts, &local_err);
1876 if (local_err != NULL) {
1877 error_propagate(errp, local_err);
1878 ret = -EINVAL;
1879 goto out;
1880 }
1881
1882 /* timeout handling is broken in libiscsi before 1.15.0 */
1883 timeout = qemu_opt_get_number(opts, "timeout", 0);
1884 #if LIBISCSI_API_VERSION >= 20150621
1885 iscsi_set_timeout(iscsi, timeout);
1886 #else
1887 if (timeout) {
1888 warn_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1889 }
1890 #endif
1891
1892 if (iscsi_full_connect_sync(iscsi, portal, lun) != 0) {
1893 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1894 iscsi_get_error(iscsi));
1895 ret = -EINVAL;
1896 goto out;
1897 }
1898
1899 iscsilun->iscsi = iscsi;
1900 iscsilun->aio_context = bdrv_get_aio_context(bs);
1901 iscsilun->lun = lun;
1902 iscsilun->has_write_same = true;
1903
1904 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1905 (void **) &inq, errp);
1906 if (task == NULL) {
1907 ret = -EINVAL;
1908 goto out;
1909 }
1910 iscsilun->type = inq->periperal_device_type;
1911 scsi_free_scsi_task(task);
1912 task = NULL;
1913
1914 iscsi_modesense_sync(iscsilun);
1915 if (iscsilun->dpofua) {
1916 bs->supported_write_flags = BDRV_REQ_FUA;
1917 }
1918
1919 /* Check the write protect flag of the LUN if we want to write */
1920 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1921 iscsilun->write_protected) {
1922 ret = bdrv_apply_auto_read_only(bs, "LUN is write protected", errp);
1923 if (ret < 0) {
1924 goto out;
1925 }
1926 flags &= ~BDRV_O_RDWR;
1927 }
1928
1929 iscsi_readcapacity_sync(iscsilun, &local_err);
1930 if (local_err != NULL) {
1931 error_propagate(errp, local_err);
1932 ret = -EINVAL;
1933 goto out;
1934 }
1935 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1936
1937 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1938 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1939 * will try to read from the device to guess the image format.
1940 */
1941 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1942 bs->sg = true;
1943 }
1944
1945 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1946 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1947 (void **) &inq_vpd, errp);
1948 if (task == NULL) {
1949 ret = -EINVAL;
1950 goto out;
1951 }
1952 for (i = 0; i < inq_vpd->num_pages; i++) {
1953 struct scsi_task *inq_task;
1954 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1955 struct scsi_inquiry_block_limits *inq_bl;
1956 struct scsi_inquiry_device_identification *inq_di;
1957 switch (inq_vpd->pages[i]) {
1958 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1959 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1960 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1961 (void **) &inq_lbp, errp);
1962 if (inq_task == NULL) {
1963 ret = -EINVAL;
1964 goto out;
1965 }
1966 memcpy(&iscsilun->lbp, inq_lbp,
1967 sizeof(struct scsi_inquiry_logical_block_provisioning));
1968 scsi_free_scsi_task(inq_task);
1969 break;
1970 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1971 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1972 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1973 (void **) &inq_bl, errp);
1974 if (inq_task == NULL) {
1975 ret = -EINVAL;
1976 goto out;
1977 }
1978 memcpy(&iscsilun->bl, inq_bl,
1979 sizeof(struct scsi_inquiry_block_limits));
1980 scsi_free_scsi_task(inq_task);
1981 break;
1982 case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION:
1983 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1984 SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION,
1985 (void **) &inq_di, errp);
1986 if (inq_task == NULL) {
1987 ret = -EINVAL;
1988 goto out;
1989 }
1990 iscsi_save_designator(iscsilun, inq_di);
1991 scsi_free_scsi_task(inq_task);
1992 break;
1993 default:
1994 break;
1995 }
1996 }
1997 scsi_free_scsi_task(task);
1998 task = NULL;
1999
2000 qemu_mutex_init(&iscsilun->mutex);
2001 iscsi_attach_aio_context(bs, iscsilun->aio_context);
2002
2003 /* Guess the internal cluster (page) size of the iscsi target by the means
2004 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
2005 * reasonable size */
2006 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
2007 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
2008 iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
2009 iscsilun->block_size;
2010 if (iscsilun->lbprz) {
2011 ret = iscsi_allocmap_init(iscsilun, flags);
2012 }
2013 }
2014
2015 if (iscsilun->lbprz && iscsilun->lbp.lbpws) {
2016 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
2017 }
2018
2019 out:
2020 qemu_opts_del(opts);
2021 g_free(initiator_name);
2022 if (task != NULL) {
2023 scsi_free_scsi_task(task);
2024 }
2025
2026 if (ret) {
2027 if (iscsi != NULL) {
2028 if (iscsi_is_logged_in(iscsi)) {
2029 iscsi_logout_sync(iscsi);
2030 }
2031 iscsi_destroy_context(iscsi);
2032 }
2033 memset(iscsilun, 0, sizeof(IscsiLun));
2034 }
2035
2036 return ret;
2037 }
2038
2039 static void iscsi_close(BlockDriverState *bs)
2040 {
2041 IscsiLun *iscsilun = bs->opaque;
2042 struct iscsi_context *iscsi = iscsilun->iscsi;
2043
2044 iscsi_detach_aio_context(bs);
2045 if (iscsi_is_logged_in(iscsi)) {
2046 iscsi_logout_sync(iscsi);
2047 }
2048 iscsi_destroy_context(iscsi);
2049 if (iscsilun->dd) {
2050 g_free(iscsilun->dd->designator);
2051 g_free(iscsilun->dd);
2052 }
2053 g_free(iscsilun->zeroblock);
2054 iscsi_allocmap_free(iscsilun);
2055 qemu_mutex_destroy(&iscsilun->mutex);
2056 memset(iscsilun, 0, sizeof(IscsiLun));
2057 }
2058
2059 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
2060 {
2061 /* We don't actually refresh here, but just return data queried in
2062 * iscsi_open(): iscsi targets don't change their limits. */
2063
2064 IscsiLun *iscsilun = bs->opaque;
2065 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
2066 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
2067
2068 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);
2069
2070 bs->bl.request_alignment = block_size;
2071
2072 if (iscsilun->bl.max_xfer_len) {
2073 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
2074 }
2075
2076 if (max_xfer_len * block_size < INT_MAX) {
2077 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
2078 }
2079
2080 if (iscsilun->lbp.lbpu) {
2081 bs->bl.max_pdiscard =
2082 MIN_NON_ZERO(iscsilun->bl.max_unmap * iscsilun->block_size,
2083 (uint64_t)UINT32_MAX * iscsilun->block_size);
2084 bs->bl.pdiscard_alignment =
2085 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2086 } else {
2087 bs->bl.pdiscard_alignment = iscsilun->block_size;
2088 }
2089
2090 bs->bl.max_pwrite_zeroes =
2091 MIN_NON_ZERO(iscsilun->bl.max_ws_len * iscsilun->block_size,
2092 max_xfer_len * iscsilun->block_size);
2093
2094 if (iscsilun->lbp.lbpws) {
2095 bs->bl.pwrite_zeroes_alignment =
2096 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
2097 } else {
2098 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
2099 }
2100 if (iscsilun->bl.opt_xfer_len &&
2101 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
2102 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
2103 iscsilun->block_size);
2104 }
2105 }
2106
2107 /* Note that this will not re-establish a connection with an iSCSI target - it
2108 * is effectively a NOP. */
2109 static int iscsi_reopen_prepare(BDRVReopenState *state,
2110 BlockReopenQueue *queue, Error **errp)
2111 {
2112 IscsiLun *iscsilun = state->bs->opaque;
2113
2114 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
2115 error_setg(errp, "Cannot open a write protected LUN as read-write");
2116 return -EACCES;
2117 }
2118 return 0;
2119 }
2120
2121 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
2122 {
2123 IscsiLun *iscsilun = reopen_state->bs->opaque;
2124
2125 /* the cache.direct status might have changed */
2126 if (iscsilun->allocmap != NULL) {
2127 iscsi_allocmap_init(iscsilun, reopen_state->flags);
2128 }
2129 }
2130
2131 static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset,
2132 bool exact, PreallocMode prealloc,
2133 BdrvRequestFlags flags, Error **errp)
2134 {
2135 IscsiLun *iscsilun = bs->opaque;
2136 int64_t cur_length;
2137 Error *local_err = NULL;
2138
2139 if (prealloc != PREALLOC_MODE_OFF) {
2140 error_setg(errp, "Unsupported preallocation mode '%s'",
2141 PreallocMode_str(prealloc));
2142 return -ENOTSUP;
2143 }
2144
2145 if (iscsilun->type != TYPE_DISK) {
2146 error_setg(errp, "Cannot resize non-disk iSCSI devices");
2147 return -ENOTSUP;
2148 }
2149
2150 iscsi_readcapacity_sync(iscsilun, &local_err);
2151 if (local_err != NULL) {
2152 error_propagate(errp, local_err);
2153 return -EIO;
2154 }
2155
2156 cur_length = iscsi_getlength(bs);
2157 if (offset != cur_length && exact) {
2158 error_setg(errp, "Cannot resize iSCSI devices");
2159 return -ENOTSUP;
2160 } else if (offset > cur_length) {
2161 error_setg(errp, "Cannot grow iSCSI devices");
2162 return -EINVAL;
2163 }
2164
2165 if (iscsilun->allocmap != NULL) {
2166 iscsi_allocmap_init(iscsilun, bs->open_flags);
2167 }
2168
2169 return 0;
2170 }
2171
2172 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
2173 {
2174 IscsiLun *iscsilun = bs->opaque;
2175 bdi->cluster_size = iscsilun->cluster_size;
2176 return 0;
2177 }
2178
2179 static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs,
2180 Error **errp)
2181 {
2182 IscsiLun *iscsilun = bs->opaque;
2183 iscsi_allocmap_invalidate(iscsilun);
2184 }
2185
2186 static int coroutine_fn iscsi_co_copy_range_from(BlockDriverState *bs,
2187 BdrvChild *src,
2188 int64_t src_offset,
2189 BdrvChild *dst,
2190 int64_t dst_offset,
2191 int64_t bytes,
2192 BdrvRequestFlags read_flags,
2193 BdrvRequestFlags write_flags)
2194 {
2195 return bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes,
2196 read_flags, write_flags);
2197 }
2198
2199 static struct scsi_task *iscsi_xcopy_task(int param_len)
2200 {
2201 struct scsi_task *task;
2202
2203 task = g_new0(struct scsi_task, 1);
2204
2205 task->cdb[0] = EXTENDED_COPY;
2206 task->cdb[10] = (param_len >> 24) & 0xFF;
2207 task->cdb[11] = (param_len >> 16) & 0xFF;
2208 task->cdb[12] = (param_len >> 8) & 0xFF;
2209 task->cdb[13] = param_len & 0xFF;
2210 task->cdb_size = 16;
2211 task->xfer_dir = SCSI_XFER_WRITE;
2212 task->expxferlen = param_len;
2213
2214 return task;
2215 }
2216
2217 static void iscsi_populate_target_desc(unsigned char *desc, IscsiLun *lun)
2218 {
2219 struct scsi_inquiry_device_designator *dd = lun->dd;
2220
2221 memset(desc, 0, 32);
2222 desc[0] = 0xE4; /* IDENT_DESCR_TGT_DESCR */
2223 desc[4] = dd->code_set;
2224 desc[5] = (dd->designator_type & 0xF)
2225 | ((dd->association & 3) << 4);
2226 desc[7] = dd->designator_length;
2227 memcpy(desc + 8, dd->designator, MIN(dd->designator_length, 20));
2228
2229 desc[28] = 0;
2230 desc[29] = (lun->block_size >> 16) & 0xFF;
2231 desc[30] = (lun->block_size >> 8) & 0xFF;
2232 desc[31] = lun->block_size & 0xFF;
2233 }
2234
2235 static void iscsi_xcopy_desc_hdr(uint8_t *hdr, int dc, int cat, int src_index,
2236 int dst_index)
2237 {
2238 hdr[0] = 0x02; /* BLK_TO_BLK_SEG_DESCR */
2239 hdr[1] = ((dc << 1) | cat) & 0xFF;
2240 hdr[2] = (XCOPY_BLK2BLK_SEG_DESC_SIZE >> 8) & 0xFF;
2241 /* don't account for the first 4 bytes in descriptor header*/
2242 hdr[3] = (XCOPY_BLK2BLK_SEG_DESC_SIZE - 4 /* SEG_DESC_SRC_INDEX_OFFSET */) & 0xFF;
2243 hdr[4] = (src_index >> 8) & 0xFF;
2244 hdr[5] = src_index & 0xFF;
2245 hdr[6] = (dst_index >> 8) & 0xFF;
2246 hdr[7] = dst_index & 0xFF;
2247 }
2248
2249 static void iscsi_xcopy_populate_desc(uint8_t *desc, int dc, int cat,
2250 int src_index, int dst_index, int num_blks,
2251 uint64_t src_lba, uint64_t dst_lba)
2252 {
2253 iscsi_xcopy_desc_hdr(desc, dc, cat, src_index, dst_index);
2254
2255 /* The caller should verify the request size */
2256 assert(num_blks < 65536);
2257 desc[10] = (num_blks >> 8) & 0xFF;
2258 desc[11] = num_blks & 0xFF;
2259 desc[12] = (src_lba >> 56) & 0xFF;
2260 desc[13] = (src_lba >> 48) & 0xFF;
2261 desc[14] = (src_lba >> 40) & 0xFF;
2262 desc[15] = (src_lba >> 32) & 0xFF;
2263 desc[16] = (src_lba >> 24) & 0xFF;
2264 desc[17] = (src_lba >> 16) & 0xFF;
2265 desc[18] = (src_lba >> 8) & 0xFF;
2266 desc[19] = src_lba & 0xFF;
2267 desc[20] = (dst_lba >> 56) & 0xFF;
2268 desc[21] = (dst_lba >> 48) & 0xFF;
2269 desc[22] = (dst_lba >> 40) & 0xFF;
2270 desc[23] = (dst_lba >> 32) & 0xFF;
2271 desc[24] = (dst_lba >> 24) & 0xFF;
2272 desc[25] = (dst_lba >> 16) & 0xFF;
2273 desc[26] = (dst_lba >> 8) & 0xFF;
2274 desc[27] = dst_lba & 0xFF;
2275 }
2276
2277 static void iscsi_xcopy_populate_header(unsigned char *buf, int list_id, int str,
2278 int list_id_usage, int prio,
2279 int tgt_desc_len,
2280 int seg_desc_len, int inline_data_len)
2281 {
2282 buf[0] = list_id;
2283 buf[1] = ((str & 1) << 5) | ((list_id_usage & 3) << 3) | (prio & 7);
2284 buf[2] = (tgt_desc_len >> 8) & 0xFF;
2285 buf[3] = tgt_desc_len & 0xFF;
2286 buf[8] = (seg_desc_len >> 24) & 0xFF;
2287 buf[9] = (seg_desc_len >> 16) & 0xFF;
2288 buf[10] = (seg_desc_len >> 8) & 0xFF;
2289 buf[11] = seg_desc_len & 0xFF;
2290 buf[12] = (inline_data_len >> 24) & 0xFF;
2291 buf[13] = (inline_data_len >> 16) & 0xFF;
2292 buf[14] = (inline_data_len >> 8) & 0xFF;
2293 buf[15] = inline_data_len & 0xFF;
2294 }
2295
2296 static void iscsi_xcopy_data(struct iscsi_data *data,
2297 IscsiLun *src, int64_t src_lba,
2298 IscsiLun *dst, int64_t dst_lba,
2299 uint16_t num_blocks)
2300 {
2301 uint8_t *buf;
2302 const int src_offset = XCOPY_DESC_OFFSET;
2303 const int dst_offset = XCOPY_DESC_OFFSET + IDENT_DESCR_TGT_DESCR_SIZE;
2304 const int seg_offset = dst_offset + IDENT_DESCR_TGT_DESCR_SIZE;
2305
2306 data->size = XCOPY_DESC_OFFSET +
2307 IDENT_DESCR_TGT_DESCR_SIZE * 2 +
2308 XCOPY_BLK2BLK_SEG_DESC_SIZE;
2309 data->data = g_malloc0(data->size);
2310 buf = data->data;
2311
2312 /* Initialise the parameter list header */
2313 iscsi_xcopy_populate_header(buf, 1, 0, 2 /* LIST_ID_USAGE_DISCARD */,
2314 0, 2 * IDENT_DESCR_TGT_DESCR_SIZE,
2315 XCOPY_BLK2BLK_SEG_DESC_SIZE,
2316 0);
2317
2318 /* Initialise CSCD list with one src + one dst descriptor */
2319 iscsi_populate_target_desc(&buf[src_offset], src);
2320 iscsi_populate_target_desc(&buf[dst_offset], dst);
2321
2322 /* Initialise one segment descriptor */
2323 iscsi_xcopy_populate_desc(&buf[seg_offset], 0, 0, 0, 1, num_blocks,
2324 src_lba, dst_lba);
2325 }
2326
2327 static int coroutine_fn iscsi_co_copy_range_to(BlockDriverState *bs,
2328 BdrvChild *src,
2329 int64_t src_offset,
2330 BdrvChild *dst,
2331 int64_t dst_offset,
2332 int64_t bytes,
2333 BdrvRequestFlags read_flags,
2334 BdrvRequestFlags write_flags)
2335 {
2336 IscsiLun *dst_lun = dst->bs->opaque;
2337 IscsiLun *src_lun;
2338 struct IscsiTask iscsi_task;
2339 struct iscsi_data data;
2340 int r = 0;
2341 int block_size;
2342
2343 if (src->bs->drv->bdrv_co_copy_range_to != iscsi_co_copy_range_to) {
2344 return -ENOTSUP;
2345 }
2346 src_lun = src->bs->opaque;
2347
2348 if (!src_lun->dd || !dst_lun->dd) {
2349 return -ENOTSUP;
2350 }
2351 if (!is_byte_request_lun_aligned(dst_offset, bytes, dst_lun)) {
2352 return -ENOTSUP;
2353 }
2354 if (!is_byte_request_lun_aligned(src_offset, bytes, src_lun)) {
2355 return -ENOTSUP;
2356 }
2357 if (dst_lun->block_size != src_lun->block_size ||
2358 !dst_lun->block_size) {
2359 return -ENOTSUP;
2360 }
2361
2362 block_size = dst_lun->block_size;
2363 if (bytes / block_size > 65535) {
2364 return -ENOTSUP;
2365 }
2366
2367 iscsi_xcopy_data(&data,
2368 src_lun, src_offset / block_size,
2369 dst_lun, dst_offset / block_size,
2370 bytes / block_size);
2371
2372 iscsi_co_init_iscsitask(dst_lun, &iscsi_task);
2373
2374 qemu_mutex_lock(&dst_lun->mutex);
2375 iscsi_task.task = iscsi_xcopy_task(data.size);
2376 retry:
2377 if (iscsi_scsi_command_async(dst_lun->iscsi, dst_lun->lun,
2378 iscsi_task.task, iscsi_co_generic_cb,
2379 &data,
2380 &iscsi_task) != 0) {
2381 r = -EIO;
2382 goto out_unlock;
2383 }
2384
2385 iscsi_co_wait_for_task(&iscsi_task, dst_lun);
2386
2387 if (iscsi_task.do_retry) {
2388 iscsi_task.complete = 0;
2389 goto retry;
2390 }
2391
2392 if (iscsi_task.status != SCSI_STATUS_GOOD) {
2393 r = iscsi_task.err_code;
2394 goto out_unlock;
2395 }
2396
2397 out_unlock:
2398
2399 trace_iscsi_xcopy(src_lun, src_offset, dst_lun, dst_offset, bytes, r);
2400 g_free(iscsi_task.task);
2401 qemu_mutex_unlock(&dst_lun->mutex);
2402 g_free(iscsi_task.err_str);
2403 return r;
2404 }
2405
2406
2407 static const char *const iscsi_strong_runtime_opts[] = {
2408 "transport",
2409 "portal",
2410 "target",
2411 "user",
2412 "password",
2413 "password-secret",
2414 "lun",
2415 "initiator-name",
2416 "header-digest",
2417
2418 NULL
2419 };
2420
2421 static BlockDriver bdrv_iscsi = {
2422 .format_name = "iscsi",
2423 .protocol_name = "iscsi",
2424
2425 .instance_size = sizeof(IscsiLun),
2426 .bdrv_parse_filename = iscsi_parse_filename,
2427 .bdrv_file_open = iscsi_open,
2428 .bdrv_close = iscsi_close,
2429 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2430 .create_opts = &bdrv_create_opts_simple,
2431 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2432 .bdrv_reopen_commit = iscsi_reopen_commit,
2433 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2434
2435 .bdrv_getlength = iscsi_getlength,
2436 .bdrv_get_info = iscsi_get_info,
2437 .bdrv_co_truncate = iscsi_co_truncate,
2438 .bdrv_refresh_limits = iscsi_refresh_limits,
2439
2440 .bdrv_co_block_status = iscsi_co_block_status,
2441 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2442 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2443 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2444 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2445 .bdrv_co_readv = iscsi_co_readv,
2446 .bdrv_co_writev = iscsi_co_writev,
2447 .bdrv_co_flush_to_disk = iscsi_co_flush,
2448
2449 #ifdef __linux__
2450 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2451 #endif
2452
2453 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2454 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2455
2456 .strong_runtime_opts = iscsi_strong_runtime_opts,
2457 };
2458
2459 #if LIBISCSI_API_VERSION >= (20160603)
2460 static BlockDriver bdrv_iser = {
2461 .format_name = "iser",
2462 .protocol_name = "iser",
2463
2464 .instance_size = sizeof(IscsiLun),
2465 .bdrv_parse_filename = iscsi_parse_filename,
2466 .bdrv_file_open = iscsi_open,
2467 .bdrv_close = iscsi_close,
2468 .bdrv_co_create_opts = bdrv_co_create_opts_simple,
2469 .create_opts = &bdrv_create_opts_simple,
2470 .bdrv_reopen_prepare = iscsi_reopen_prepare,
2471 .bdrv_reopen_commit = iscsi_reopen_commit,
2472 .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
2473
2474 .bdrv_getlength = iscsi_getlength,
2475 .bdrv_get_info = iscsi_get_info,
2476 .bdrv_co_truncate = iscsi_co_truncate,
2477 .bdrv_refresh_limits = iscsi_refresh_limits,
2478
2479 .bdrv_co_block_status = iscsi_co_block_status,
2480 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2481 .bdrv_co_copy_range_from = iscsi_co_copy_range_from,
2482 .bdrv_co_copy_range_to = iscsi_co_copy_range_to,
2483 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2484 .bdrv_co_readv = iscsi_co_readv,
2485 .bdrv_co_writev = iscsi_co_writev,
2486 .bdrv_co_flush_to_disk = iscsi_co_flush,
2487
2488 #ifdef __linux__
2489 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2490 #endif
2491
2492 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2493 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2494
2495 .strong_runtime_opts = iscsi_strong_runtime_opts,
2496 };
2497 #endif
2498
2499 static void iscsi_block_init(void)
2500 {
2501 bdrv_register(&bdrv_iscsi);
2502 #if LIBISCSI_API_VERSION >= (20160603)
2503 bdrv_register(&bdrv_iser);
2504 #endif
2505 }
2506
2507 block_init(iscsi_block_init);
AR7 emulation for QEMU