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target-arm: Code changes to implement overwrite of tag field on PC load
[qemu/kevin.git] / block / iscsi.c
blob46ddc355aca49a8ba81e2e60165050829fbfa24b
1 /*
2 * QEMU Block driver for iSCSI images
3 *
4 * Copyright (c) 2010-2011 Ronnie Sahlberg <ronniesahlberg@gmail.com>
5 * Copyright (c) 2012-2016 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/scsi.h"
38 #include "qemu/iov.h"
39 #include "qemu/uuid.h"
40 #include "qmp-commands.h"
41 #include "qapi/qmp/qstring.h"
42 #include "crypto/secret.h"
43
44 #include <iscsi/iscsi.h>
45 #include <iscsi/scsi-lowlevel.h>
46
47 #ifdef __linux__
48 #include <scsi/sg.h>
49 #endif
50
51 typedef struct IscsiLun {
52 struct iscsi_context *iscsi;
53 AioContext *aio_context;
54 int lun;
55 enum scsi_inquiry_peripheral_device_type type;
56 int block_size;
57 uint64_t num_blocks;
58 int events;
59 QEMUTimer *nop_timer;
60 QEMUTimer *event_timer;
61 struct scsi_inquiry_logical_block_provisioning lbp;
62 struct scsi_inquiry_block_limits bl;
63 unsigned char *zeroblock;
64 /* The allocmap tracks which clusters (pages) on the iSCSI target are
65 * allocated and which are not. In case a target returns zeros for
66 * unallocated pages (iscsilun->lprz) we can directly return zeros instead
67 * of reading zeros over the wire if a read request falls within an
68 * unallocated block. As there are 3 possible states we need 2 bitmaps to
69 * track. allocmap_valid keeps track if QEMU's information about a page is
70 * valid. allocmap tracks if a page is allocated or not. In case QEMU has no
71 * valid information about a page the corresponding allocmap entry should be
72 * switched to unallocated as well to force a new lookup of the allocation
73 * status as lookups are generally skipped if a page is suspect to be
74 * allocated. If a iSCSI target is opened with cache.direct = on the
75 * allocmap_valid does not exist turning all cached information invalid so
76 * that a fresh lookup is made for any page even if allocmap entry returns
77 * it's unallocated. */
78 unsigned long *allocmap;
79 unsigned long *allocmap_valid;
80 long allocmap_size;
81 int cluster_sectors;
82 bool use_16_for_rw;
83 bool write_protected;
84 bool lbpme;
85 bool lbprz;
86 bool dpofua;
87 bool has_write_same;
88 bool request_timed_out;
89 } IscsiLun;
90
91 typedef struct IscsiTask {
92 int status;
93 int complete;
94 int retries;
95 int do_retry;
96 struct scsi_task *task;
97 Coroutine *co;
98 IscsiLun *iscsilun;
99 QEMUTimer retry_timer;
100 int err_code;
101 } IscsiTask;
102
103 typedef struct IscsiAIOCB {
104 BlockAIOCB common;
105 QEMUIOVector *qiov;
106 QEMUBH *bh;
107 IscsiLun *iscsilun;
108 struct scsi_task *task;
109 uint8_t *buf;
110 int status;
111 int64_t sector_num;
112 int nb_sectors;
113 int ret;
114 #ifdef __linux__
115 sg_io_hdr_t *ioh;
116 #endif
117 } IscsiAIOCB;
118
119 /* libiscsi uses time_t so its enough to process events every second */
120 #define EVENT_INTERVAL 1000
121 #define NOP_INTERVAL 5000
122 #define MAX_NOP_FAILURES 3
123 #define ISCSI_CMD_RETRIES ARRAY_SIZE(iscsi_retry_times)
124 static const unsigned iscsi_retry_times[] = {8, 32, 128, 512, 2048, 8192, 32768};
125
126 /* this threshold is a trade-off knob to choose between
127 * the potential additional overhead of an extra GET_LBA_STATUS request
128 * vs. unnecessarily reading a lot of zero sectors over the wire.
129 * If a read request is greater or equal than ISCSI_CHECKALLOC_THRES
130 * sectors we check the allocation status of the area covered by the
131 * request first if the allocationmap indicates that the area might be
132 * unallocated. */
133 #define ISCSI_CHECKALLOC_THRES 64
134
135 static void
136 iscsi_bh_cb(void *p)
137 {
138 IscsiAIOCB *acb = p;
139
140 qemu_bh_delete(acb->bh);
141
142 g_free(acb->buf);
143 acb->buf = NULL;
144
145 acb->common.cb(acb->common.opaque, acb->status);
146
147 if (acb->task != NULL) {
148 scsi_free_scsi_task(acb->task);
149 acb->task = NULL;
150 }
151
152 qemu_aio_unref(acb);
153 }
154
155 static void
156 iscsi_schedule_bh(IscsiAIOCB *acb)
157 {
158 if (acb->bh) {
159 return;
160 }
161 acb->bh = aio_bh_new(acb->iscsilun->aio_context, iscsi_bh_cb, acb);
162 qemu_bh_schedule(acb->bh);
163 }
164
165 static void iscsi_co_generic_bh_cb(void *opaque)
166 {
167 struct IscsiTask *iTask = opaque;
168 iTask->complete = 1;
169 qemu_coroutine_enter(iTask->co);
170 }
171
172 static void iscsi_retry_timer_expired(void *opaque)
173 {
174 struct IscsiTask *iTask = opaque;
175 iTask->complete = 1;
176 if (iTask->co) {
177 qemu_coroutine_enter(iTask->co);
178 }
179 }
180
181 static inline unsigned exp_random(double mean)
182 {
183 return -mean * log((double)rand() / RAND_MAX);
184 }
185
186 /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST was introduced in
187 * libiscsi 1.10.0, together with other constants we need. Use it as
188 * a hint that we have to define them ourselves if needed, to keep the
189 * minimum required libiscsi version at 1.9.0. We use an ASCQ macro for
190 * the test because SCSI_STATUS_* is an enum.
191 *
192 * To guard against future changes where SCSI_SENSE_ASCQ_* also becomes
193 * an enum, check against the LIBISCSI_API_VERSION macro, which was
194 * introduced in 1.11.0. If it is present, there is no need to define
195 * anything.
196 */
197 #if !defined(SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST) && \
198 !defined(LIBISCSI_API_VERSION)
199 #define SCSI_STATUS_TASK_SET_FULL 0x28
200 #define SCSI_STATUS_TIMEOUT 0x0f000002
201 #define SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST 0x2600
202 #define SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR 0x1a00
203 #endif
204
205 static int iscsi_translate_sense(struct scsi_sense *sense)
206 {
207 int ret;
208
209 switch (sense->key) {
210 case SCSI_SENSE_NOT_READY:
211 return -EBUSY;
212 case SCSI_SENSE_DATA_PROTECTION:
213 return -EACCES;
214 case SCSI_SENSE_COMMAND_ABORTED:
215 return -ECANCELED;
216 case SCSI_SENSE_ILLEGAL_REQUEST:
217 /* Parse ASCQ */
218 break;
219 default:
220 return -EIO;
221 }
222 switch (sense->ascq) {
223 case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR:
224 case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE:
225 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB:
226 case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST:
227 ret = -EINVAL;
228 break;
229 case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE:
230 ret = -ENOSPC;
231 break;
232 case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED:
233 ret = -ENOTSUP;
234 break;
235 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT:
236 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED:
237 case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN:
238 ret = -ENOMEDIUM;
239 break;
240 case SCSI_SENSE_ASCQ_WRITE_PROTECTED:
241 ret = -EACCES;
242 break;
243 default:
244 ret = -EIO;
245 break;
246 }
247 return ret;
248 }
249
250 static void
251 iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
252 void *command_data, void *opaque)
253 {
254 struct IscsiTask *iTask = opaque;
255 struct scsi_task *task = command_data;
256
257 iTask->status = status;
258 iTask->do_retry = 0;
259 iTask->task = task;
260
261 if (status != SCSI_STATUS_GOOD) {
262 if (iTask->retries++ < ISCSI_CMD_RETRIES) {
263 if (status == SCSI_STATUS_CHECK_CONDITION
264 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
265 error_report("iSCSI CheckCondition: %s",
266 iscsi_get_error(iscsi));
267 iTask->do_retry = 1;
268 goto out;
269 }
270 if (status == SCSI_STATUS_BUSY ||
271 status == SCSI_STATUS_TIMEOUT ||
272 status == SCSI_STATUS_TASK_SET_FULL) {
273 unsigned retry_time =
274 exp_random(iscsi_retry_times[iTask->retries - 1]);
275 if (status == SCSI_STATUS_TIMEOUT) {
276 /* make sure the request is rescheduled AFTER the
277 * reconnect is initiated */
278 retry_time = EVENT_INTERVAL * 2;
279 iTask->iscsilun->request_timed_out = true;
280 }
281 error_report("iSCSI Busy/TaskSetFull/TimeOut"
282 " (retry #%u in %u ms): %s",
283 iTask->retries, retry_time,
284 iscsi_get_error(iscsi));
285 aio_timer_init(iTask->iscsilun->aio_context,
286 &iTask->retry_timer, QEMU_CLOCK_REALTIME,
287 SCALE_MS, iscsi_retry_timer_expired, iTask);
288 timer_mod(&iTask->retry_timer,
289 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + retry_time);
290 iTask->do_retry = 1;
291 return;
292 }
293 }
294 iTask->err_code = iscsi_translate_sense(&task->sense);
295 error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
296 }
297
298 out:
299 if (iTask->co) {
300 aio_bh_schedule_oneshot(iTask->iscsilun->aio_context,
301 iscsi_co_generic_bh_cb, iTask);
302 } else {
303 iTask->complete = 1;
304 }
305 }
306
307 static void iscsi_co_init_iscsitask(IscsiLun *iscsilun, struct IscsiTask *iTask)
308 {
309 *iTask = (struct IscsiTask) {
310 .co = qemu_coroutine_self(),
311 .iscsilun = iscsilun,
312 };
313 }
314
315 static void
316 iscsi_abort_task_cb(struct iscsi_context *iscsi, int status, void *command_data,
317 void *private_data)
318 {
319 IscsiAIOCB *acb = private_data;
320
321 acb->status = -ECANCELED;
322 iscsi_schedule_bh(acb);
323 }
324
325 static void
326 iscsi_aio_cancel(BlockAIOCB *blockacb)
327 {
328 IscsiAIOCB *acb = (IscsiAIOCB *)blockacb;
329 IscsiLun *iscsilun = acb->iscsilun;
330
331 if (acb->status != -EINPROGRESS) {
332 return;
333 }
334
335 /* send a task mgmt call to the target to cancel the task on the target */
336 iscsi_task_mgmt_abort_task_async(iscsilun->iscsi, acb->task,
337 iscsi_abort_task_cb, acb);
338
339 }
340
341 static const AIOCBInfo iscsi_aiocb_info = {
342 .aiocb_size = sizeof(IscsiAIOCB),
343 .cancel_async = iscsi_aio_cancel,
344 };
345
346
347 static void iscsi_process_read(void *arg);
348 static void iscsi_process_write(void *arg);
349
350 static void
351 iscsi_set_events(IscsiLun *iscsilun)
352 {
353 struct iscsi_context *iscsi = iscsilun->iscsi;
354 int ev = iscsi_which_events(iscsi);
355
356 if (ev != iscsilun->events) {
357 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsi),
358 false,
359 (ev & POLLIN) ? iscsi_process_read : NULL,
360 (ev & POLLOUT) ? iscsi_process_write : NULL,
361 iscsilun);
362 iscsilun->events = ev;
363 }
364 }
365
366 static void iscsi_timed_check_events(void *opaque)
367 {
368 IscsiLun *iscsilun = opaque;
369
370 /* check for timed out requests */
371 iscsi_service(iscsilun->iscsi, 0);
372
373 if (iscsilun->request_timed_out) {
374 iscsilun->request_timed_out = false;
375 iscsi_reconnect(iscsilun->iscsi);
376 }
377
378 /* newer versions of libiscsi may return zero events. Ensure we are able
379 * to return to service once this situation changes. */
380 iscsi_set_events(iscsilun);
381
382 timer_mod(iscsilun->event_timer,
383 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
384 }
385
386 static void
387 iscsi_process_read(void *arg)
388 {
389 IscsiLun *iscsilun = arg;
390 struct iscsi_context *iscsi = iscsilun->iscsi;
391
392 iscsi_service(iscsi, POLLIN);
393 iscsi_set_events(iscsilun);
394 }
395
396 static void
397 iscsi_process_write(void *arg)
398 {
399 IscsiLun *iscsilun = arg;
400 struct iscsi_context *iscsi = iscsilun->iscsi;
401
402 iscsi_service(iscsi, POLLOUT);
403 iscsi_set_events(iscsilun);
404 }
405
406 static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
407 {
408 return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
409 }
410
411 static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
412 {
413 return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
414 }
415
416 static bool is_byte_request_lun_aligned(int64_t offset, int count,
417 IscsiLun *iscsilun)
418 {
419 if (offset % iscsilun->block_size || count % iscsilun->block_size) {
420 error_report("iSCSI misaligned request: "
421 "iscsilun->block_size %u, offset %" PRIi64
422 ", count %d",
423 iscsilun->block_size, offset, count);
424 return false;
425 }
426 return true;
427 }
428
429 static bool is_sector_request_lun_aligned(int64_t sector_num, int nb_sectors,
430 IscsiLun *iscsilun)
431 {
432 assert(nb_sectors <= BDRV_REQUEST_MAX_SECTORS);
433 return is_byte_request_lun_aligned(sector_num << BDRV_SECTOR_BITS,
434 nb_sectors << BDRV_SECTOR_BITS,
435 iscsilun);
436 }
437
438 static void iscsi_allocmap_free(IscsiLun *iscsilun)
439 {
440 g_free(iscsilun->allocmap);
441 g_free(iscsilun->allocmap_valid);
442 iscsilun->allocmap = NULL;
443 iscsilun->allocmap_valid = NULL;
444 }
445
446
447 static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
448 {
449 iscsi_allocmap_free(iscsilun);
450
451 iscsilun->allocmap_size =
452 DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun),
453 iscsilun->cluster_sectors);
454
455 iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
456 if (!iscsilun->allocmap) {
457 return -ENOMEM;
458 }
459
460 if (open_flags & BDRV_O_NOCACHE) {
461 /* in case that cache.direct = on all allocmap entries are
462 * treated as invalid to force a relookup of the block
463 * status on every read request */
464 return 0;
465 }
466
467 iscsilun->allocmap_valid = bitmap_try_new(iscsilun->allocmap_size);
468 if (!iscsilun->allocmap_valid) {
469 /* if we are under memory pressure free the allocmap as well */
470 iscsi_allocmap_free(iscsilun);
471 return -ENOMEM;
472 }
473
474 return 0;
475 }
476
477 static void
478 iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num,
479 int nb_sectors, bool allocated, bool valid)
480 {
481 int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
482
483 if (iscsilun->allocmap == NULL) {
484 return;
485 }
486 /* expand to entirely contain all affected clusters */
487 cl_num_expanded = sector_num / iscsilun->cluster_sectors;
488 nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors,
489 iscsilun->cluster_sectors) - cl_num_expanded;
490 /* shrink to touch only completely contained clusters */
491 cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors);
492 nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors
493 - cl_num_shrunk;
494 if (allocated) {
495 bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
496 } else {
497 bitmap_clear(iscsilun->allocmap, cl_num_shrunk, nb_cls_shrunk);
498 }
499
500 if (iscsilun->allocmap_valid == NULL) {
501 return;
502 }
503 if (valid) {
504 bitmap_set(iscsilun->allocmap_valid, cl_num_shrunk, nb_cls_shrunk);
505 } else {
506 bitmap_clear(iscsilun->allocmap_valid, cl_num_expanded,
507 nb_cls_expanded);
508 }
509 }
510
511 static void
512 iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num,
513 int nb_sectors)
514 {
515 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true);
516 }
517
518 static void
519 iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num,
520 int nb_sectors)
521 {
522 /* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
523 * is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
524 */
525 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true);
526 }
527
528 static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num,
529 int nb_sectors)
530 {
531 iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false);
532 }
533
534 static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
535 {
536 if (iscsilun->allocmap) {
537 bitmap_zero(iscsilun->allocmap, iscsilun->allocmap_size);
538 }
539 if (iscsilun->allocmap_valid) {
540 bitmap_zero(iscsilun->allocmap_valid, iscsilun->allocmap_size);
541 }
542 }
543
544 static inline bool
545 iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num,
546 int nb_sectors)
547 {
548 unsigned long size;
549 if (iscsilun->allocmap == NULL) {
550 return true;
551 }
552 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
553 return !(find_next_bit(iscsilun->allocmap, size,
554 sector_num / iscsilun->cluster_sectors) == size);
555 }
556
557 static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
558 int64_t sector_num, int nb_sectors)
559 {
560 unsigned long size;
561 if (iscsilun->allocmap_valid == NULL) {
562 return false;
563 }
564 size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
565 return (find_next_zero_bit(iscsilun->allocmap_valid, size,
566 sector_num / iscsilun->cluster_sectors) == size);
567 }
568
569 static int coroutine_fn
570 iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
571 QEMUIOVector *iov, int flags)
572 {
573 IscsiLun *iscsilun = bs->opaque;
574 struct IscsiTask iTask;
575 uint64_t lba;
576 uint32_t num_sectors;
577 bool fua = flags & BDRV_REQ_FUA;
578
579 if (fua) {
580 assert(iscsilun->dpofua);
581 }
582 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
583 return -EINVAL;
584 }
585
586 if (bs->bl.max_transfer) {
587 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
588 }
589
590 lba = sector_qemu2lun(sector_num, iscsilun);
591 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
592 iscsi_co_init_iscsitask(iscsilun, &iTask);
593 retry:
594 if (iscsilun->use_16_for_rw) {
595 iTask.task = iscsi_write16_task(iscsilun->iscsi, iscsilun->lun, lba,
596 NULL, num_sectors * iscsilun->block_size,
597 iscsilun->block_size, 0, 0, fua, 0, 0,
598 iscsi_co_generic_cb, &iTask);
599 } else {
600 iTask.task = iscsi_write10_task(iscsilun->iscsi, iscsilun->lun, lba,
601 NULL, num_sectors * iscsilun->block_size,
602 iscsilun->block_size, 0, 0, fua, 0, 0,
603 iscsi_co_generic_cb, &iTask);
604 }
605 if (iTask.task == NULL) {
606 return -ENOMEM;
607 }
608 scsi_task_set_iov_out(iTask.task, (struct scsi_iovec *) iov->iov,
609 iov->niov);
610 while (!iTask.complete) {
611 iscsi_set_events(iscsilun);
612 qemu_coroutine_yield();
613 }
614
615 if (iTask.task != NULL) {
616 scsi_free_scsi_task(iTask.task);
617 iTask.task = NULL;
618 }
619
620 if (iTask.do_retry) {
621 iTask.complete = 0;
622 goto retry;
623 }
624
625 if (iTask.status != SCSI_STATUS_GOOD) {
626 iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors);
627 return iTask.err_code;
628 }
629
630 iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors);
631
632 return 0;
633 }
634
635
636
637 static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
638 int64_t sector_num,
639 int nb_sectors, int *pnum,
640 BlockDriverState **file)
641 {
642 IscsiLun *iscsilun = bs->opaque;
643 struct scsi_get_lba_status *lbas = NULL;
644 struct scsi_lba_status_descriptor *lbasd = NULL;
645 struct IscsiTask iTask;
646 int64_t ret;
647
648 iscsi_co_init_iscsitask(iscsilun, &iTask);
649
650 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
651 ret = -EINVAL;
652 goto out;
653 }
654
655 /* default to all sectors allocated */
656 ret = BDRV_BLOCK_DATA;
657 ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID;
658 *pnum = nb_sectors;
659
660 /* LUN does not support logical block provisioning */
661 if (!iscsilun->lbpme) {
662 goto out;
663 }
664
665 retry:
666 if (iscsi_get_lba_status_task(iscsilun->iscsi, iscsilun->lun,
667 sector_qemu2lun(sector_num, iscsilun),
668 8 + 16, iscsi_co_generic_cb,
669 &iTask) == NULL) {
670 ret = -ENOMEM;
671 goto out;
672 }
673
674 while (!iTask.complete) {
675 iscsi_set_events(iscsilun);
676 qemu_coroutine_yield();
677 }
678
679 if (iTask.do_retry) {
680 if (iTask.task != NULL) {
681 scsi_free_scsi_task(iTask.task);
682 iTask.task = NULL;
683 }
684 iTask.complete = 0;
685 goto retry;
686 }
687
688 if (iTask.status != SCSI_STATUS_GOOD) {
689 /* in case the get_lba_status_callout fails (i.e.
690 * because the device is busy or the cmd is not
691 * supported) we pretend all blocks are allocated
692 * for backwards compatibility */
693 goto out;
694 }
695
696 lbas = scsi_datain_unmarshall(iTask.task);
697 if (lbas == NULL) {
698 ret = -EIO;
699 goto out;
700 }
701
702 lbasd = &lbas->descriptors[0];
703
704 if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) {
705 ret = -EIO;
706 goto out;
707 }
708
709 *pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun);
710
711 if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
712 lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
713 ret &= ~BDRV_BLOCK_DATA;
714 if (iscsilun->lbprz) {
715 ret |= BDRV_BLOCK_ZERO;
716 }
717 }
718
719 if (ret & BDRV_BLOCK_ZERO) {
720 iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum);
721 } else {
722 iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum);
723 }
724
725 if (*pnum > nb_sectors) {
726 *pnum = nb_sectors;
727 }
728 out:
729 if (iTask.task != NULL) {
730 scsi_free_scsi_task(iTask.task);
731 }
732 if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) {
733 *file = bs;
734 }
735 return ret;
736 }
737
738 static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
739 int64_t sector_num, int nb_sectors,
740 QEMUIOVector *iov)
741 {
742 IscsiLun *iscsilun = bs->opaque;
743 struct IscsiTask iTask;
744 uint64_t lba;
745 uint32_t num_sectors;
746
747 if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
748 return -EINVAL;
749 }
750
751 if (bs->bl.max_transfer) {
752 assert(nb_sectors << BDRV_SECTOR_BITS <= bs->bl.max_transfer);
753 }
754
755 /* if cache.direct is off and we have a valid entry in our allocation map
756 * we can skip checking the block status and directly return zeroes if
757 * the request falls within an unallocated area */
758 if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
759 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
760 qemu_iovec_memset(iov, 0, 0x00, iov->size);
761 return 0;
762 }
763
764 if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
765 !iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
766 !iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
767 int pnum;
768 BlockDriverState *file;
769 /* check the block status from the beginning of the cluster
770 * containing the start sector */
771 int64_t ret = iscsi_co_get_block_status(bs,
772 sector_num - sector_num % iscsilun->cluster_sectors,
773 BDRV_REQUEST_MAX_SECTORS, &pnum, &file);
774 if (ret < 0) {
775 return ret;
776 }
777 /* if the whole request falls into an unallocated area we can avoid
778 * to read and directly return zeroes instead */
779 if (ret & BDRV_BLOCK_ZERO &&
780 pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) {
781 qemu_iovec_memset(iov, 0, 0x00, iov->size);
782 return 0;
783 }
784 }
785
786 lba = sector_qemu2lun(sector_num, iscsilun);
787 num_sectors = sector_qemu2lun(nb_sectors, iscsilun);
788
789 iscsi_co_init_iscsitask(iscsilun, &iTask);
790 retry:
791 if (iscsilun->use_16_for_rw) {
792 iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba,
793 num_sectors * iscsilun->block_size,
794 iscsilun->block_size, 0, 0, 0, 0, 0,
795 iscsi_co_generic_cb, &iTask);
796 } else {
797 iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba,
798 num_sectors * iscsilun->block_size,
799 iscsilun->block_size,
800 0, 0, 0, 0, 0,
801 iscsi_co_generic_cb, &iTask);
802 }
803 if (iTask.task == NULL) {
804 return -ENOMEM;
805 }
806 scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov);
807
808 while (!iTask.complete) {
809 iscsi_set_events(iscsilun);
810 qemu_coroutine_yield();
811 }
812
813 if (iTask.task != NULL) {
814 scsi_free_scsi_task(iTask.task);
815 iTask.task = NULL;
816 }
817
818 if (iTask.do_retry) {
819 iTask.complete = 0;
820 goto retry;
821 }
822
823 if (iTask.status != SCSI_STATUS_GOOD) {
824 return iTask.err_code;
825 }
826
827 return 0;
828 }
829
830 static int coroutine_fn iscsi_co_flush(BlockDriverState *bs)
831 {
832 IscsiLun *iscsilun = bs->opaque;
833 struct IscsiTask iTask;
834
835 iscsi_co_init_iscsitask(iscsilun, &iTask);
836 retry:
837 if (iscsi_synchronizecache10_task(iscsilun->iscsi, iscsilun->lun, 0, 0, 0,
838 0, iscsi_co_generic_cb, &iTask) == NULL) {
839 return -ENOMEM;
840 }
841
842 while (!iTask.complete) {
843 iscsi_set_events(iscsilun);
844 qemu_coroutine_yield();
845 }
846
847 if (iTask.task != NULL) {
848 scsi_free_scsi_task(iTask.task);
849 iTask.task = NULL;
850 }
851
852 if (iTask.do_retry) {
853 iTask.complete = 0;
854 goto retry;
855 }
856
857 if (iTask.status != SCSI_STATUS_GOOD) {
858 return iTask.err_code;
859 }
860
861 return 0;
862 }
863
864 #ifdef __linux__
865 static void
866 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
867 void *command_data, void *opaque)
868 {
869 IscsiAIOCB *acb = opaque;
870
871 g_free(acb->buf);
872 acb->buf = NULL;
873
874 acb->status = 0;
875 if (status < 0) {
876 error_report("Failed to ioctl(SG_IO) to iSCSI lun. %s",
877 iscsi_get_error(iscsi));
878 acb->status = iscsi_translate_sense(&acb->task->sense);
879 }
880
881 acb->ioh->driver_status = 0;
882 acb->ioh->host_status = 0;
883 acb->ioh->resid = 0;
884 acb->ioh->status = status;
885
886 #define SG_ERR_DRIVER_SENSE 0x08
887
888 if (status == SCSI_STATUS_CHECK_CONDITION && acb->task->datain.size >= 2) {
889 int ss;
890
891 acb->ioh->driver_status |= SG_ERR_DRIVER_SENSE;
892
893 acb->ioh->sb_len_wr = acb->task->datain.size - 2;
894 ss = (acb->ioh->mx_sb_len >= acb->ioh->sb_len_wr) ?
895 acb->ioh->mx_sb_len : acb->ioh->sb_len_wr;
896 memcpy(acb->ioh->sbp, &acb->task->datain.data[2], ss);
897 }
898
899 iscsi_schedule_bh(acb);
900 }
901
902 static void iscsi_ioctl_bh_completion(void *opaque)
903 {
904 IscsiAIOCB *acb = opaque;
905
906 qemu_bh_delete(acb->bh);
907 acb->common.cb(acb->common.opaque, acb->ret);
908 qemu_aio_unref(acb);
909 }
910
911 static void iscsi_ioctl_handle_emulated(IscsiAIOCB *acb, int req, void *buf)
912 {
913 BlockDriverState *bs = acb->common.bs;
914 IscsiLun *iscsilun = bs->opaque;
915 int ret = 0;
916
917 switch (req) {
918 case SG_GET_VERSION_NUM:
919 *(int *)buf = 30000;
920 break;
921 case SG_GET_SCSI_ID:
922 ((struct sg_scsi_id *)buf)->scsi_type = iscsilun->type;
923 break;
924 default:
925 ret = -EINVAL;
926 }
927 assert(!acb->bh);
928 acb->bh = aio_bh_new(bdrv_get_aio_context(bs),
929 iscsi_ioctl_bh_completion, acb);
930 acb->ret = ret;
931 qemu_bh_schedule(acb->bh);
932 }
933
934 static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
935 unsigned long int req, void *buf,
936 BlockCompletionFunc *cb, void *opaque)
937 {
938 IscsiLun *iscsilun = bs->opaque;
939 struct iscsi_context *iscsi = iscsilun->iscsi;
940 struct iscsi_data data;
941 IscsiAIOCB *acb;
942
943 acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
944
945 acb->iscsilun = iscsilun;
946 acb->bh = NULL;
947 acb->status = -EINPROGRESS;
948 acb->buf = NULL;
949 acb->ioh = buf;
950
951 if (req != SG_IO) {
952 iscsi_ioctl_handle_emulated(acb, req, buf);
953 return &acb->common;
954 }
955
956 if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) {
957 error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)",
958 acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE);
959 qemu_aio_unref(acb);
960 return NULL;
961 }
962
963 acb->task = malloc(sizeof(struct scsi_task));
964 if (acb->task == NULL) {
965 error_report("iSCSI: Failed to allocate task for scsi command. %s",
966 iscsi_get_error(iscsi));
967 qemu_aio_unref(acb);
968 return NULL;
969 }
970 memset(acb->task, 0, sizeof(struct scsi_task));
971
972 switch (acb->ioh->dxfer_direction) {
973 case SG_DXFER_TO_DEV:
974 acb->task->xfer_dir = SCSI_XFER_WRITE;
975 break;
976 case SG_DXFER_FROM_DEV:
977 acb->task->xfer_dir = SCSI_XFER_READ;
978 break;
979 default:
980 acb->task->xfer_dir = SCSI_XFER_NONE;
981 break;
982 }
983
984 acb->task->cdb_size = acb->ioh->cmd_len;
985 memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
986 acb->task->expxferlen = acb->ioh->dxfer_len;
987
988 data.size = 0;
989 if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
990 if (acb->ioh->iovec_count == 0) {
991 data.data = acb->ioh->dxferp;
992 data.size = acb->ioh->dxfer_len;
993 } else {
994 scsi_task_set_iov_out(acb->task,
995 (struct scsi_iovec *) acb->ioh->dxferp,
996 acb->ioh->iovec_count);
997 }
998 }
999
1000 if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
1001 iscsi_aio_ioctl_cb,
1002 (data.size > 0) ? &data : NULL,
1003 acb) != 0) {
1004 scsi_free_scsi_task(acb->task);
1005 qemu_aio_unref(acb);
1006 return NULL;
1007 }
1008
1009 /* tell libiscsi to read straight into the buffer we got from ioctl */
1010 if (acb->task->xfer_dir == SCSI_XFER_READ) {
1011 if (acb->ioh->iovec_count == 0) {
1012 scsi_task_add_data_in_buffer(acb->task,
1013 acb->ioh->dxfer_len,
1014 acb->ioh->dxferp);
1015 } else {
1016 scsi_task_set_iov_in(acb->task,
1017 (struct scsi_iovec *) acb->ioh->dxferp,
1018 acb->ioh->iovec_count);
1019 }
1020 }
1021
1022 iscsi_set_events(iscsilun);
1023
1024 return &acb->common;
1025 }
1026
1027 #endif
1028
1029 static int64_t
1030 iscsi_getlength(BlockDriverState *bs)
1031 {
1032 IscsiLun *iscsilun = bs->opaque;
1033 int64_t len;
1034
1035 len = iscsilun->num_blocks;
1036 len *= iscsilun->block_size;
1037
1038 return len;
1039 }
1040
1041 static int
1042 coroutine_fn iscsi_co_pdiscard(BlockDriverState *bs, int64_t offset, int count)
1043 {
1044 IscsiLun *iscsilun = bs->opaque;
1045 struct IscsiTask iTask;
1046 struct unmap_list list;
1047
1048 assert(is_byte_request_lun_aligned(offset, count, iscsilun));
1049
1050 if (!iscsilun->lbp.lbpu) {
1051 /* UNMAP is not supported by the target */
1052 return 0;
1053 }
1054
1055 list.lba = offset / iscsilun->block_size;
1056 list.num = count / iscsilun->block_size;
1057
1058 iscsi_co_init_iscsitask(iscsilun, &iTask);
1059 retry:
1060 if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
1061 iscsi_co_generic_cb, &iTask) == NULL) {
1062 return -ENOMEM;
1063 }
1064
1065 while (!iTask.complete) {
1066 iscsi_set_events(iscsilun);
1067 qemu_coroutine_yield();
1068 }
1069
1070 if (iTask.task != NULL) {
1071 scsi_free_scsi_task(iTask.task);
1072 iTask.task = NULL;
1073 }
1074
1075 if (iTask.do_retry) {
1076 iTask.complete = 0;
1077 goto retry;
1078 }
1079
1080 if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
1081 /* the target might fail with a check condition if it
1082 is not happy with the alignment of the UNMAP request
1083 we silently fail in this case */
1084 return 0;
1085 }
1086
1087 if (iTask.status != SCSI_STATUS_GOOD) {
1088 return iTask.err_code;
1089 }
1090
1091 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1092 count >> BDRV_SECTOR_BITS);
1093
1094 return 0;
1095 }
1096
1097 static int
1098 coroutine_fn iscsi_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
1099 int count, BdrvRequestFlags flags)
1100 {
1101 IscsiLun *iscsilun = bs->opaque;
1102 struct IscsiTask iTask;
1103 uint64_t lba;
1104 uint32_t nb_blocks;
1105 bool use_16_for_ws = iscsilun->use_16_for_rw;
1106
1107 if (!is_byte_request_lun_aligned(offset, count, iscsilun)) {
1108 return -ENOTSUP;
1109 }
1110
1111 if (flags & BDRV_REQ_MAY_UNMAP) {
1112 if (!use_16_for_ws && !iscsilun->lbp.lbpws10) {
1113 /* WRITESAME10 with UNMAP is unsupported try WRITESAME16 */
1114 use_16_for_ws = true;
1115 }
1116 if (use_16_for_ws && !iscsilun->lbp.lbpws) {
1117 /* WRITESAME16 with UNMAP is not supported by the target,
1118 * fall back and try WRITESAME10/16 without UNMAP */
1119 flags &= ~BDRV_REQ_MAY_UNMAP;
1120 use_16_for_ws = iscsilun->use_16_for_rw;
1121 }
1122 }
1123
1124 if (!(flags & BDRV_REQ_MAY_UNMAP) && !iscsilun->has_write_same) {
1125 /* WRITESAME without UNMAP is not supported by the target */
1126 return -ENOTSUP;
1127 }
1128
1129 lba = offset / iscsilun->block_size;
1130 nb_blocks = count / iscsilun->block_size;
1131
1132 if (iscsilun->zeroblock == NULL) {
1133 iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
1134 if (iscsilun->zeroblock == NULL) {
1135 return -ENOMEM;
1136 }
1137 }
1138
1139 iscsi_co_init_iscsitask(iscsilun, &iTask);
1140 retry:
1141 if (use_16_for_ws) {
1142 iTask.task = iscsi_writesame16_task(iscsilun->iscsi, iscsilun->lun, lba,
1143 iscsilun->zeroblock, iscsilun->block_size,
1144 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1145 0, 0, iscsi_co_generic_cb, &iTask);
1146 } else {
1147 iTask.task = iscsi_writesame10_task(iscsilun->iscsi, iscsilun->lun, lba,
1148 iscsilun->zeroblock, iscsilun->block_size,
1149 nb_blocks, 0, !!(flags & BDRV_REQ_MAY_UNMAP),
1150 0, 0, iscsi_co_generic_cb, &iTask);
1151 }
1152 if (iTask.task == NULL) {
1153 return -ENOMEM;
1154 }
1155
1156 while (!iTask.complete) {
1157 iscsi_set_events(iscsilun);
1158 qemu_coroutine_yield();
1159 }
1160
1161 if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
1162 iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
1163 (iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE ||
1164 iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB)) {
1165 /* WRITE SAME is not supported by the target */
1166 iscsilun->has_write_same = false;
1167 scsi_free_scsi_task(iTask.task);
1168 return -ENOTSUP;
1169 }
1170
1171 if (iTask.task != NULL) {
1172 scsi_free_scsi_task(iTask.task);
1173 iTask.task = NULL;
1174 }
1175
1176 if (iTask.do_retry) {
1177 iTask.complete = 0;
1178 goto retry;
1179 }
1180
1181 if (iTask.status != SCSI_STATUS_GOOD) {
1182 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1183 count >> BDRV_SECTOR_BITS);
1184 return iTask.err_code;
1185 }
1186
1187 if (flags & BDRV_REQ_MAY_UNMAP) {
1188 iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
1189 count >> BDRV_SECTOR_BITS);
1190 } else {
1191 iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS,
1192 count >> BDRV_SECTOR_BITS);
1193 }
1194
1195 return 0;
1196 }
1197
1198 static void parse_chap(struct iscsi_context *iscsi, const char *target,
1199 Error **errp)
1200 {
1201 QemuOptsList *list;
1202 QemuOpts *opts;
1203 const char *user = NULL;
1204 const char *password = NULL;
1205 const char *secretid;
1206 char *secret = NULL;
1207
1208 list = qemu_find_opts("iscsi");
1209 if (!list) {
1210 return;
1211 }
1212
1213 opts = qemu_opts_find(list, target);
1214 if (opts == NULL) {
1215 opts = QTAILQ_FIRST(&list->head);
1216 if (!opts) {
1217 return;
1218 }
1219 }
1220
1221 user = qemu_opt_get(opts, "user");
1222 if (!user) {
1223 return;
1224 }
1225
1226 secretid = qemu_opt_get(opts, "password-secret");
1227 password = qemu_opt_get(opts, "password");
1228 if (secretid && password) {
1229 error_setg(errp, "'password' and 'password-secret' properties are "
1230 "mutually exclusive");
1231 return;
1232 }
1233 if (secretid) {
1234 secret = qcrypto_secret_lookup_as_utf8(secretid, errp);
1235 if (!secret) {
1236 return;
1237 }
1238 password = secret;
1239 } else if (!password) {
1240 error_setg(errp, "CHAP username specified but no password was given");
1241 return;
1242 }
1243
1244 if (iscsi_set_initiator_username_pwd(iscsi, user, password)) {
1245 error_setg(errp, "Failed to set initiator username and password");
1246 }
1247
1248 g_free(secret);
1249 }
1250
1251 static void parse_header_digest(struct iscsi_context *iscsi, const char *target,
1252 Error **errp)
1253 {
1254 QemuOptsList *list;
1255 QemuOpts *opts;
1256 const char *digest = NULL;
1257
1258 list = qemu_find_opts("iscsi");
1259 if (!list) {
1260 return;
1261 }
1262
1263 opts = qemu_opts_find(list, target);
1264 if (opts == NULL) {
1265 opts = QTAILQ_FIRST(&list->head);
1266 if (!opts) {
1267 return;
1268 }
1269 }
1270
1271 digest = qemu_opt_get(opts, "header-digest");
1272 if (!digest) {
1273 return;
1274 }
1275
1276 if (!strcmp(digest, "CRC32C")) {
1277 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C);
1278 } else if (!strcmp(digest, "NONE")) {
1279 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE);
1280 } else if (!strcmp(digest, "CRC32C-NONE")) {
1281 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
1282 } else if (!strcmp(digest, "NONE-CRC32C")) {
1283 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1284 } else {
1285 error_setg(errp, "Invalid header-digest setting : %s", digest);
1286 }
1287 }
1288
1289 static char *parse_initiator_name(const char *target)
1290 {
1291 QemuOptsList *list;
1292 QemuOpts *opts;
1293 const char *name;
1294 char *iscsi_name;
1295 UuidInfo *uuid_info;
1296
1297 list = qemu_find_opts("iscsi");
1298 if (list) {
1299 opts = qemu_opts_find(list, target);
1300 if (!opts) {
1301 opts = QTAILQ_FIRST(&list->head);
1302 }
1303 if (opts) {
1304 name = qemu_opt_get(opts, "initiator-name");
1305 if (name) {
1306 return g_strdup(name);
1307 }
1308 }
1309 }
1310
1311 uuid_info = qmp_query_uuid(NULL);
1312 if (strcmp(uuid_info->UUID, UUID_NONE) == 0) {
1313 name = qemu_get_vm_name();
1314 } else {
1315 name = uuid_info->UUID;
1316 }
1317 iscsi_name = g_strdup_printf("iqn.2008-11.org.linux-kvm%s%s",
1318 name ? ":" : "", name ? name : "");
1319 qapi_free_UuidInfo(uuid_info);
1320 return iscsi_name;
1321 }
1322
1323 static int parse_timeout(const char *target)
1324 {
1325 QemuOptsList *list;
1326 QemuOpts *opts;
1327 const char *timeout;
1328
1329 list = qemu_find_opts("iscsi");
1330 if (list) {
1331 opts = qemu_opts_find(list, target);
1332 if (!opts) {
1333 opts = QTAILQ_FIRST(&list->head);
1334 }
1335 if (opts) {
1336 timeout = qemu_opt_get(opts, "timeout");
1337 if (timeout) {
1338 return atoi(timeout);
1339 }
1340 }
1341 }
1342
1343 return 0;
1344 }
1345
1346 static void iscsi_nop_timed_event(void *opaque)
1347 {
1348 IscsiLun *iscsilun = opaque;
1349
1350 if (iscsi_get_nops_in_flight(iscsilun->iscsi) >= MAX_NOP_FAILURES) {
1351 error_report("iSCSI: NOP timeout. Reconnecting...");
1352 iscsilun->request_timed_out = true;
1353 } else if (iscsi_nop_out_async(iscsilun->iscsi, NULL, NULL, 0, NULL) != 0) {
1354 error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
1355 return;
1356 }
1357
1358 timer_mod(iscsilun->nop_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1359 iscsi_set_events(iscsilun);
1360 }
1361
1362 static void iscsi_readcapacity_sync(IscsiLun *iscsilun, Error **errp)
1363 {
1364 struct scsi_task *task = NULL;
1365 struct scsi_readcapacity10 *rc10 = NULL;
1366 struct scsi_readcapacity16 *rc16 = NULL;
1367 int retries = ISCSI_CMD_RETRIES;
1368
1369 do {
1370 if (task != NULL) {
1371 scsi_free_scsi_task(task);
1372 task = NULL;
1373 }
1374
1375 switch (iscsilun->type) {
1376 case TYPE_DISK:
1377 task = iscsi_readcapacity16_sync(iscsilun->iscsi, iscsilun->lun);
1378 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1379 rc16 = scsi_datain_unmarshall(task);
1380 if (rc16 == NULL) {
1381 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity16 data.");
1382 } else {
1383 iscsilun->block_size = rc16->block_length;
1384 iscsilun->num_blocks = rc16->returned_lba + 1;
1385 iscsilun->lbpme = !!rc16->lbpme;
1386 iscsilun->lbprz = !!rc16->lbprz;
1387 iscsilun->use_16_for_rw = (rc16->returned_lba > 0xffffffff);
1388 }
1389 break;
1390 }
1391 if (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1392 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
1393 break;
1394 }
1395 /* Fall through and try READ CAPACITY(10) instead. */
1396 case TYPE_ROM:
1397 task = iscsi_readcapacity10_sync(iscsilun->iscsi, iscsilun->lun, 0, 0);
1398 if (task != NULL && task->status == SCSI_STATUS_GOOD) {
1399 rc10 = scsi_datain_unmarshall(task);
1400 if (rc10 == NULL) {
1401 error_setg(errp, "iSCSI: Failed to unmarshall readcapacity10 data.");
1402 } else {
1403 iscsilun->block_size = rc10->block_size;
1404 if (rc10->lba == 0) {
1405 /* blank disk loaded */
1406 iscsilun->num_blocks = 0;
1407 } else {
1408 iscsilun->num_blocks = rc10->lba + 1;
1409 }
1410 }
1411 }
1412 break;
1413 default:
1414 return;
1415 }
1416 } while (task != NULL && task->status == SCSI_STATUS_CHECK_CONDITION
1417 && task->sense.key == SCSI_SENSE_UNIT_ATTENTION
1418 && retries-- > 0);
1419
1420 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1421 error_setg(errp, "iSCSI: failed to send readcapacity10/16 command");
1422 } else if (!iscsilun->block_size ||
1423 iscsilun->block_size % BDRV_SECTOR_SIZE) {
1424 error_setg(errp, "iSCSI: the target returned an invalid "
1425 "block size of %d.", iscsilun->block_size);
1426 }
1427 if (task) {
1428 scsi_free_scsi_task(task);
1429 }
1430 }
1431
1432 /* TODO Convert to fine grained options */
1433 static QemuOptsList runtime_opts = {
1434 .name = "iscsi",
1435 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
1436 .desc = {
1437 {
1438 .name = "filename",
1439 .type = QEMU_OPT_STRING,
1440 .help = "URL to the iscsi image",
1441 },
1442 { /* end of list */ }
1443 },
1444 };
1445
1446 static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
1447 int evpd, int pc, void **inq, Error **errp)
1448 {
1449 int full_size;
1450 struct scsi_task *task = NULL;
1451 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
1452 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1453 goto fail;
1454 }
1455 full_size = scsi_datain_getfullsize(task);
1456 if (full_size > task->datain.size) {
1457 scsi_free_scsi_task(task);
1458
1459 /* we need more data for the full list */
1460 task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
1461 if (task == NULL || task->status != SCSI_STATUS_GOOD) {
1462 goto fail;
1463 }
1464 }
1465
1466 *inq = scsi_datain_unmarshall(task);
1467 if (*inq == NULL) {
1468 error_setg(errp, "iSCSI: failed to unmarshall inquiry datain blob");
1469 goto fail_with_err;
1470 }
1471
1472 return task;
1473
1474 fail:
1475 error_setg(errp, "iSCSI: Inquiry command failed : %s",
1476 iscsi_get_error(iscsi));
1477 fail_with_err:
1478 if (task != NULL) {
1479 scsi_free_scsi_task(task);
1480 }
1481 return NULL;
1482 }
1483
1484 static void iscsi_detach_aio_context(BlockDriverState *bs)
1485 {
1486 IscsiLun *iscsilun = bs->opaque;
1487
1488 aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
1489 false, NULL, NULL, NULL);
1490 iscsilun->events = 0;
1491
1492 if (iscsilun->nop_timer) {
1493 timer_del(iscsilun->nop_timer);
1494 timer_free(iscsilun->nop_timer);
1495 iscsilun->nop_timer = NULL;
1496 }
1497 if (iscsilun->event_timer) {
1498 timer_del(iscsilun->event_timer);
1499 timer_free(iscsilun->event_timer);
1500 iscsilun->event_timer = NULL;
1501 }
1502 }
1503
1504 static void iscsi_attach_aio_context(BlockDriverState *bs,
1505 AioContext *new_context)
1506 {
1507 IscsiLun *iscsilun = bs->opaque;
1508
1509 iscsilun->aio_context = new_context;
1510 iscsi_set_events(iscsilun);
1511
1512 /* Set up a timer for sending out iSCSI NOPs */
1513 iscsilun->nop_timer = aio_timer_new(iscsilun->aio_context,
1514 QEMU_CLOCK_REALTIME, SCALE_MS,
1515 iscsi_nop_timed_event, iscsilun);
1516 timer_mod(iscsilun->nop_timer,
1517 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + NOP_INTERVAL);
1518
1519 /* Set up a timer for periodic calls to iscsi_set_events and to
1520 * scan for command timeout */
1521 iscsilun->event_timer = aio_timer_new(iscsilun->aio_context,
1522 QEMU_CLOCK_REALTIME, SCALE_MS,
1523 iscsi_timed_check_events, iscsilun);
1524 timer_mod(iscsilun->event_timer,
1525 qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + EVENT_INTERVAL);
1526 }
1527
1528 static void iscsi_modesense_sync(IscsiLun *iscsilun)
1529 {
1530 struct scsi_task *task;
1531 struct scsi_mode_sense *ms = NULL;
1532 iscsilun->write_protected = false;
1533 iscsilun->dpofua = false;
1534
1535 task = iscsi_modesense6_sync(iscsilun->iscsi, iscsilun->lun,
1536 1, SCSI_MODESENSE_PC_CURRENT,
1537 0x3F, 0, 255);
1538 if (task == NULL) {
1539 error_report("iSCSI: Failed to send MODE_SENSE(6) command: %s",
1540 iscsi_get_error(iscsilun->iscsi));
1541 goto out;
1542 }
1543
1544 if (task->status != SCSI_STATUS_GOOD) {
1545 error_report("iSCSI: Failed MODE_SENSE(6), LUN assumed writable");
1546 goto out;
1547 }
1548 ms = scsi_datain_unmarshall(task);
1549 if (!ms) {
1550 error_report("iSCSI: Failed to unmarshall MODE_SENSE(6) data: %s",
1551 iscsi_get_error(iscsilun->iscsi));
1552 goto out;
1553 }
1554 iscsilun->write_protected = ms->device_specific_parameter & 0x80;
1555 iscsilun->dpofua = ms->device_specific_parameter & 0x10;
1556
1557 out:
1558 if (task) {
1559 scsi_free_scsi_task(task);
1560 }
1561 }
1562
1563 /*
1564 * We support iscsi url's on the form
1565 * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
1566 */
1567 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
1568 Error **errp)
1569 {
1570 IscsiLun *iscsilun = bs->opaque;
1571 struct iscsi_context *iscsi = NULL;
1572 struct iscsi_url *iscsi_url = NULL;
1573 struct scsi_task *task = NULL;
1574 struct scsi_inquiry_standard *inq = NULL;
1575 struct scsi_inquiry_supported_pages *inq_vpd;
1576 char *initiator_name = NULL;
1577 QemuOpts *opts;
1578 Error *local_err = NULL;
1579 const char *filename;
1580 int i, ret = 0, timeout = 0;
1581
1582 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
1583 qemu_opts_absorb_qdict(opts, options, &local_err);
1584 if (local_err) {
1585 error_propagate(errp, local_err);
1586 ret = -EINVAL;
1587 goto out;
1588 }
1589
1590 filename = qemu_opt_get(opts, "filename");
1591
1592 iscsi_url = iscsi_parse_full_url(iscsi, filename);
1593 if (iscsi_url == NULL) {
1594 error_setg(errp, "Failed to parse URL : %s", filename);
1595 ret = -EINVAL;
1596 goto out;
1597 }
1598
1599 memset(iscsilun, 0, sizeof(IscsiLun));
1600
1601 initiator_name = parse_initiator_name(iscsi_url->target);
1602
1603 iscsi = iscsi_create_context(initiator_name);
1604 if (iscsi == NULL) {
1605 error_setg(errp, "iSCSI: Failed to create iSCSI context.");
1606 ret = -ENOMEM;
1607 goto out;
1608 }
1609
1610 if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
1611 error_setg(errp, "iSCSI: Failed to set target name.");
1612 ret = -EINVAL;
1613 goto out;
1614 }
1615
1616 if (iscsi_url->user[0] != '\0') {
1617 ret = iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user,
1618 iscsi_url->passwd);
1619 if (ret != 0) {
1620 error_setg(errp, "Failed to set initiator username and password");
1621 ret = -EINVAL;
1622 goto out;
1623 }
1624 }
1625
1626 /* check if we got CHAP username/password via the options */
1627 parse_chap(iscsi, iscsi_url->target, &local_err);
1628 if (local_err != NULL) {
1629 error_propagate(errp, local_err);
1630 ret = -EINVAL;
1631 goto out;
1632 }
1633
1634 if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
1635 error_setg(errp, "iSCSI: Failed to set session type to normal.");
1636 ret = -EINVAL;
1637 goto out;
1638 }
1639
1640 iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
1641
1642 /* check if we got HEADER_DIGEST via the options */
1643 parse_header_digest(iscsi, iscsi_url->target, &local_err);
1644 if (local_err != NULL) {
1645 error_propagate(errp, local_err);
1646 ret = -EINVAL;
1647 goto out;
1648 }
1649
1650 /* timeout handling is broken in libiscsi before 1.15.0 */
1651 timeout = parse_timeout(iscsi_url->target);
1652 #if defined(LIBISCSI_API_VERSION) && LIBISCSI_API_VERSION >= 20150621
1653 iscsi_set_timeout(iscsi, timeout);
1654 #else
1655 if (timeout) {
1656 error_report("iSCSI: ignoring timeout value for libiscsi <1.15.0");
1657 }
1658 #endif
1659
1660 if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
1661 error_setg(errp, "iSCSI: Failed to connect to LUN : %s",
1662 iscsi_get_error(iscsi));
1663 ret = -EINVAL;
1664 goto out;
1665 }
1666
1667 iscsilun->iscsi = iscsi;
1668 iscsilun->aio_context = bdrv_get_aio_context(bs);
1669 iscsilun->lun = iscsi_url->lun;
1670 iscsilun->has_write_same = true;
1671
1672 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
1673 (void **) &inq, errp);
1674 if (task == NULL) {
1675 ret = -EINVAL;
1676 goto out;
1677 }
1678 iscsilun->type = inq->periperal_device_type;
1679 scsi_free_scsi_task(task);
1680 task = NULL;
1681
1682 iscsi_modesense_sync(iscsilun);
1683 if (iscsilun->dpofua) {
1684 bs->supported_write_flags = BDRV_REQ_FUA;
1685 }
1686 bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
1687
1688 /* Check the write protect flag of the LUN if we want to write */
1689 if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
1690 iscsilun->write_protected) {
1691 error_setg(errp, "Cannot open a write protected LUN as read-write");
1692 ret = -EACCES;
1693 goto out;
1694 }
1695
1696 iscsi_readcapacity_sync(iscsilun, &local_err);
1697 if (local_err != NULL) {
1698 error_propagate(errp, local_err);
1699 ret = -EINVAL;
1700 goto out;
1701 }
1702 bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
1703
1704 /* We don't have any emulation for devices other than disks and CD-ROMs, so
1705 * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
1706 * will try to read from the device to guess the image format.
1707 */
1708 if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
1709 bs->sg = true;
1710 }
1711
1712 task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1713 SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
1714 (void **) &inq_vpd, errp);
1715 if (task == NULL) {
1716 ret = -EINVAL;
1717 goto out;
1718 }
1719 for (i = 0; i < inq_vpd->num_pages; i++) {
1720 struct scsi_task *inq_task;
1721 struct scsi_inquiry_logical_block_provisioning *inq_lbp;
1722 struct scsi_inquiry_block_limits *inq_bl;
1723 switch (inq_vpd->pages[i]) {
1724 case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
1725 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1726 SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
1727 (void **) &inq_lbp, errp);
1728 if (inq_task == NULL) {
1729 ret = -EINVAL;
1730 goto out;
1731 }
1732 memcpy(&iscsilun->lbp, inq_lbp,
1733 sizeof(struct scsi_inquiry_logical_block_provisioning));
1734 scsi_free_scsi_task(inq_task);
1735 break;
1736 case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
1737 inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
1738 SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
1739 (void **) &inq_bl, errp);
1740 if (inq_task == NULL) {
1741 ret = -EINVAL;
1742 goto out;
1743 }
1744 memcpy(&iscsilun->bl, inq_bl,
1745 sizeof(struct scsi_inquiry_block_limits));
1746 scsi_free_scsi_task(inq_task);
1747 break;
1748 default:
1749 break;
1750 }
1751 }
1752 scsi_free_scsi_task(task);
1753 task = NULL;
1754
1755 iscsi_attach_aio_context(bs, iscsilun->aio_context);
1756
1757 /* Guess the internal cluster (page) size of the iscsi target by the means
1758 * of opt_unmap_gran. Transfer the unmap granularity only if it has a
1759 * reasonable size */
1760 if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
1761 iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
1762 iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran *
1763 iscsilun->block_size) >> BDRV_SECTOR_BITS;
1764 if (iscsilun->lbprz) {
1765 ret = iscsi_allocmap_init(iscsilun, bs->open_flags);
1766 }
1767 }
1768
1769 out:
1770 qemu_opts_del(opts);
1771 g_free(initiator_name);
1772 if (iscsi_url != NULL) {
1773 iscsi_destroy_url(iscsi_url);
1774 }
1775 if (task != NULL) {
1776 scsi_free_scsi_task(task);
1777 }
1778
1779 if (ret) {
1780 if (iscsi != NULL) {
1781 if (iscsi_is_logged_in(iscsi)) {
1782 iscsi_logout_sync(iscsi);
1783 }
1784 iscsi_destroy_context(iscsi);
1785 }
1786 memset(iscsilun, 0, sizeof(IscsiLun));
1787 }
1788 return ret;
1789 }
1790
1791 static void iscsi_close(BlockDriverState *bs)
1792 {
1793 IscsiLun *iscsilun = bs->opaque;
1794 struct iscsi_context *iscsi = iscsilun->iscsi;
1795
1796 iscsi_detach_aio_context(bs);
1797 if (iscsi_is_logged_in(iscsi)) {
1798 iscsi_logout_sync(iscsi);
1799 }
1800 iscsi_destroy_context(iscsi);
1801 g_free(iscsilun->zeroblock);
1802 iscsi_allocmap_free(iscsilun);
1803 memset(iscsilun, 0, sizeof(IscsiLun));
1804 }
1805
1806 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
1807 {
1808 /* We don't actually refresh here, but just return data queried in
1809 * iscsi_open(): iscsi targets don't change their limits. */
1810
1811 IscsiLun *iscsilun = bs->opaque;
1812 uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
1813 unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);
1814
1815 assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);
1816
1817 bs->bl.request_alignment = block_size;
1818
1819 if (iscsilun->bl.max_xfer_len) {
1820 max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
1821 }
1822
1823 if (max_xfer_len * block_size < INT_MAX) {
1824 bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
1825 }
1826
1827 if (iscsilun->lbp.lbpu) {
1828 if (iscsilun->bl.max_unmap < 0xffffffff / block_size) {
1829 bs->bl.max_pdiscard =
1830 iscsilun->bl.max_unmap * iscsilun->block_size;
1831 }
1832 bs->bl.pdiscard_alignment =
1833 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
1834 } else {
1835 bs->bl.pdiscard_alignment = iscsilun->block_size;
1836 }
1837
1838 if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) {
1839 bs->bl.max_pwrite_zeroes =
1840 iscsilun->bl.max_ws_len * iscsilun->block_size;
1841 }
1842 if (iscsilun->lbp.lbpws) {
1843 bs->bl.pwrite_zeroes_alignment =
1844 iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
1845 } else {
1846 bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
1847 }
1848 if (iscsilun->bl.opt_xfer_len &&
1849 iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
1850 bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
1851 iscsilun->block_size);
1852 }
1853 }
1854
1855 /* Note that this will not re-establish a connection with an iSCSI target - it
1856 * is effectively a NOP. */
1857 static int iscsi_reopen_prepare(BDRVReopenState *state,
1858 BlockReopenQueue *queue, Error **errp)
1859 {
1860 IscsiLun *iscsilun = state->bs->opaque;
1861
1862 if (state->flags & BDRV_O_RDWR && iscsilun->write_protected) {
1863 error_setg(errp, "Cannot open a write protected LUN as read-write");
1864 return -EACCES;
1865 }
1866 return 0;
1867 }
1868
1869 static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
1870 {
1871 IscsiLun *iscsilun = reopen_state->bs->opaque;
1872
1873 /* the cache.direct status might have changed */
1874 if (iscsilun->allocmap != NULL) {
1875 iscsi_allocmap_init(iscsilun, reopen_state->flags);
1876 }
1877 }
1878
1879 static int iscsi_truncate(BlockDriverState *bs, int64_t offset)
1880 {
1881 IscsiLun *iscsilun = bs->opaque;
1882 Error *local_err = NULL;
1883
1884 if (iscsilun->type != TYPE_DISK) {
1885 return -ENOTSUP;
1886 }
1887
1888 iscsi_readcapacity_sync(iscsilun, &local_err);
1889 if (local_err != NULL) {
1890 error_free(local_err);
1891 return -EIO;
1892 }
1893
1894 if (offset > iscsi_getlength(bs)) {
1895 return -EINVAL;
1896 }
1897
1898 if (iscsilun->allocmap != NULL) {
1899 iscsi_allocmap_init(iscsilun, bs->open_flags);
1900 }
1901
1902 return 0;
1903 }
1904
1905 static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp)
1906 {
1907 int ret = 0;
1908 int64_t total_size = 0;
1909 BlockDriverState *bs;
1910 IscsiLun *iscsilun = NULL;
1911 QDict *bs_options;
1912
1913 bs = bdrv_new();
1914
1915 /* Read out options */
1916 total_size = DIV_ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1917 BDRV_SECTOR_SIZE);
1918 bs->opaque = g_new0(struct IscsiLun, 1);
1919 iscsilun = bs->opaque;
1920
1921 bs_options = qdict_new();
1922 qdict_put(bs_options, "filename", qstring_from_str(filename));
1923 ret = iscsi_open(bs, bs_options, 0, NULL);
1924 QDECREF(bs_options);
1925
1926 if (ret != 0) {
1927 goto out;
1928 }
1929 iscsi_detach_aio_context(bs);
1930 if (iscsilun->type != TYPE_DISK) {
1931 ret = -ENODEV;
1932 goto out;
1933 }
1934 if (bs->total_sectors < total_size) {
1935 ret = -ENOSPC;
1936 goto out;
1937 }
1938
1939 ret = 0;
1940 out:
1941 if (iscsilun->iscsi != NULL) {
1942 iscsi_destroy_context(iscsilun->iscsi);
1943 }
1944 g_free(bs->opaque);
1945 bs->opaque = NULL;
1946 bdrv_unref(bs);
1947 return ret;
1948 }
1949
1950 static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1951 {
1952 IscsiLun *iscsilun = bs->opaque;
1953 bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
1954 bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
1955 bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE;
1956 return 0;
1957 }
1958
1959 static void iscsi_invalidate_cache(BlockDriverState *bs,
1960 Error **errp)
1961 {
1962 IscsiLun *iscsilun = bs->opaque;
1963 iscsi_allocmap_invalidate(iscsilun);
1964 }
1965
1966 static QemuOptsList iscsi_create_opts = {
1967 .name = "iscsi-create-opts",
1968 .head = QTAILQ_HEAD_INITIALIZER(iscsi_create_opts.head),
1969 .desc = {
1970 {
1971 .name = BLOCK_OPT_SIZE,
1972 .type = QEMU_OPT_SIZE,
1973 .help = "Virtual disk size"
1974 },
1975 { /* end of list */ }
1976 }
1977 };
1978
1979 static BlockDriver bdrv_iscsi = {
1980 .format_name = "iscsi",
1981 .protocol_name = "iscsi",
1982
1983 .instance_size = sizeof(IscsiLun),
1984 .bdrv_needs_filename = true,
1985 .bdrv_file_open = iscsi_open,
1986 .bdrv_close = iscsi_close,
1987 .bdrv_create = iscsi_create,
1988 .create_opts = &iscsi_create_opts,
1989 .bdrv_reopen_prepare = iscsi_reopen_prepare,
1990 .bdrv_reopen_commit = iscsi_reopen_commit,
1991 .bdrv_invalidate_cache = iscsi_invalidate_cache,
1992
1993 .bdrv_getlength = iscsi_getlength,
1994 .bdrv_get_info = iscsi_get_info,
1995 .bdrv_truncate = iscsi_truncate,
1996 .bdrv_refresh_limits = iscsi_refresh_limits,
1997
1998 .bdrv_co_get_block_status = iscsi_co_get_block_status,
1999 .bdrv_co_pdiscard = iscsi_co_pdiscard,
2000 .bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
2001 .bdrv_co_readv = iscsi_co_readv,
2002 .bdrv_co_writev_flags = iscsi_co_writev_flags,
2003 .bdrv_co_flush_to_disk = iscsi_co_flush,
2004
2005 #ifdef __linux__
2006 .bdrv_aio_ioctl = iscsi_aio_ioctl,
2007 #endif
2008
2009 .bdrv_detach_aio_context = iscsi_detach_aio_context,
2010 .bdrv_attach_aio_context = iscsi_attach_aio_context,
2011 };
2012
2013 static void iscsi_block_init(void)
2014 {
2015 bdrv_register(&bdrv_iscsi);
2016 }
2017
2018 block_init(iscsi_block_init);
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