1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/vmalloc.h>
3 #include <linux/bitmap.h>
4 #include "null_blk.h"
5
6 #define CREATE_TRACE_POINTS
7 #include "trace.h"
8
9 #undef pr_fmt
10 #define pr_fmt(fmt) "null_blk: " fmt
11
12 #define NULL_ZONE_INVALID_WP ((sector_t)-1)
13
mb_to_sects(unsigned long mb)14 static inline sector_t mb_to_sects(unsigned long mb)
15 {
16 return ((sector_t)mb * SZ_1M) >> SECTOR_SHIFT;
17 }
18
null_zone_no(struct nullb_device * dev,sector_t sect)19 static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
20 {
21 return sect >> ilog2(dev->zone_size_sects);
22 }
23
null_init_zone_lock(struct nullb_device * dev,struct nullb_zone * zone)24 static inline void null_init_zone_lock(struct nullb_device *dev,
25 struct nullb_zone *zone)
26 {
27 if (!dev->memory_backed)
28 spin_lock_init(&zone->spinlock);
29 else
30 mutex_init(&zone->mutex);
31 }
32
null_lock_zone(struct nullb_device * dev,struct nullb_zone * zone)33 static inline void null_lock_zone(struct nullb_device *dev,
34 struct nullb_zone *zone)
35 {
36 if (!dev->memory_backed)
37 spin_lock_irq(&zone->spinlock);
38 else
39 mutex_lock(&zone->mutex);
40 }
41
null_unlock_zone(struct nullb_device * dev,struct nullb_zone * zone)42 static inline void null_unlock_zone(struct nullb_device *dev,
43 struct nullb_zone *zone)
44 {
45 if (!dev->memory_backed)
46 spin_unlock_irq(&zone->spinlock);
47 else
48 mutex_unlock(&zone->mutex);
49 }
50
null_init_zoned_dev(struct nullb_device * dev,struct queue_limits * lim)51 int null_init_zoned_dev(struct nullb_device *dev,
52 struct queue_limits *lim)
53 {
54 sector_t dev_capacity_sects, zone_capacity_sects;
55 struct nullb_zone *zone;
56 sector_t sector = 0;
57 unsigned int i;
58
59 if (!is_power_of_2(dev->zone_size)) {
60 pr_err("zone_size must be power-of-two\n");
61 return -EINVAL;
62 }
63 if (dev->zone_size > dev->size) {
64 pr_err("Zone size larger than device capacity\n");
65 return -EINVAL;
66 }
67
68 if (!dev->zone_capacity)
69 dev->zone_capacity = dev->zone_size;
70
71 if (dev->zone_capacity > dev->zone_size) {
72 pr_err("zone capacity (%lu MB) larger than zone size (%lu MB)\n",
73 dev->zone_capacity, dev->zone_size);
74 return -EINVAL;
75 }
76
77 /*
78 * If a smaller zone capacity was requested, do not allow a smaller last
79 * zone at the same time as such zone configuration does not correspond
80 * to any real zoned device.
81 */
82 if (dev->zone_capacity != dev->zone_size &&
83 dev->size & (dev->zone_size - 1)) {
84 pr_err("A smaller last zone is not allowed with zone capacity smaller than zone size.\n");
85 return -EINVAL;
86 }
87
88 zone_capacity_sects = mb_to_sects(dev->zone_capacity);
89 dev_capacity_sects = mb_to_sects(dev->size);
90 dev->zone_size_sects = mb_to_sects(dev->zone_size);
91 dev->nr_zones = round_up(dev_capacity_sects, dev->zone_size_sects)
92 >> ilog2(dev->zone_size_sects);
93
94 dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct nullb_zone),
95 GFP_KERNEL | __GFP_ZERO);
96 if (!dev->zones)
97 return -ENOMEM;
98
99 spin_lock_init(&dev->zone_res_lock);
100
101 if (dev->zone_nr_conv >= dev->nr_zones) {
102 dev->zone_nr_conv = dev->nr_zones - 1;
103 pr_info("changed the number of conventional zones to %u",
104 dev->zone_nr_conv);
105 }
106
107 dev->zone_append_max_sectors =
108 min(ALIGN_DOWN(dev->zone_append_max_sectors,
109 dev->blocksize >> SECTOR_SHIFT),
110 zone_capacity_sects);
111
112 /* Max active zones has to be < nbr of seq zones in order to be enforceable */
113 if (dev->zone_max_active >= dev->nr_zones - dev->zone_nr_conv) {
114 dev->zone_max_active = 0;
115 pr_info("zone_max_active limit disabled, limit >= zone count\n");
116 }
117
118 /* Max open zones has to be <= max active zones */
119 if (dev->zone_max_active && dev->zone_max_open > dev->zone_max_active) {
120 dev->zone_max_open = dev->zone_max_active;
121 pr_info("changed the maximum number of open zones to %u\n",
122 dev->zone_max_open);
123 } else if (dev->zone_max_open >= dev->nr_zones - dev->zone_nr_conv) {
124 dev->zone_max_open = 0;
125 pr_info("zone_max_open limit disabled, limit >= zone count\n");
126 }
127 dev->need_zone_res_mgmt = dev->zone_max_active || dev->zone_max_open;
128 dev->imp_close_zone_no = dev->zone_nr_conv;
129
130 for (i = 0; i < dev->zone_nr_conv; i++) {
131 zone = &dev->zones[i];
132
133 null_init_zone_lock(dev, zone);
134 zone->start = sector;
135 zone->len = dev->zone_size_sects;
136 zone->capacity = zone->len;
137 zone->wp = zone->start + zone->len;
138 zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
139 zone->cond = BLK_ZONE_COND_NOT_WP;
140
141 sector += dev->zone_size_sects;
142 }
143
144 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
145 zone = &dev->zones[i];
146
147 null_init_zone_lock(dev, zone);
148 zone->start = sector;
149 if (zone->start + dev->zone_size_sects > dev_capacity_sects)
150 zone->len = dev_capacity_sects - zone->start;
151 else
152 zone->len = dev->zone_size_sects;
153 zone->capacity =
154 min_t(sector_t, zone->len, zone_capacity_sects);
155 zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
156 if (dev->zone_full) {
157 zone->cond = BLK_ZONE_COND_FULL;
158 zone->wp = zone->start + zone->capacity;
159 } else{
160 zone->cond = BLK_ZONE_COND_EMPTY;
161 zone->wp = zone->start;
162 }
163
164 sector += dev->zone_size_sects;
165 }
166
167 lim->features |= BLK_FEAT_ZONED;
168 lim->chunk_sectors = dev->zone_size_sects;
169 lim->max_zone_append_sectors = dev->zone_append_max_sectors;
170 lim->max_open_zones = dev->zone_max_open;
171 lim->max_active_zones = dev->zone_max_active;
172 return 0;
173 }
174
null_register_zoned_dev(struct nullb * nullb)175 int null_register_zoned_dev(struct nullb *nullb)
176 {
177 struct request_queue *q = nullb->q;
178 struct gendisk *disk = nullb->disk;
179
180 pr_info("%s: using %s zone append\n",
181 disk->disk_name,
182 queue_emulates_zone_append(q) ? "emulated" : "native");
183
184 return blk_revalidate_disk_zones(disk);
185 }
186
null_free_zoned_dev(struct nullb_device * dev)187 void null_free_zoned_dev(struct nullb_device *dev)
188 {
189 kvfree(dev->zones);
190 dev->zones = NULL;
191 }
192
null_report_zones(struct gendisk * disk,sector_t sector,unsigned int nr_zones,report_zones_cb cb,void * data)193 int null_report_zones(struct gendisk *disk, sector_t sector,
194 unsigned int nr_zones, report_zones_cb cb, void *data)
195 {
196 struct nullb *nullb = disk->private_data;
197 struct nullb_device *dev = nullb->dev;
198 unsigned int first_zone, i;
199 struct nullb_zone *zone;
200 struct blk_zone blkz;
201 int error;
202
203 first_zone = null_zone_no(dev, sector);
204 if (first_zone >= dev->nr_zones)
205 return 0;
206
207 nr_zones = min(nr_zones, dev->nr_zones - first_zone);
208 trace_nullb_report_zones(nullb, nr_zones);
209
210 memset(&blkz, 0, sizeof(struct blk_zone));
211 zone = &dev->zones[first_zone];
212 for (i = 0; i < nr_zones; i++, zone++) {
213 /*
214 * Stacked DM target drivers will remap the zone information by
215 * modifying the zone information passed to the report callback.
216 * So use a local copy to avoid corruption of the device zone
217 * array.
218 */
219 null_lock_zone(dev, zone);
220 blkz.start = zone->start;
221 blkz.len = zone->len;
222 blkz.wp = zone->wp;
223 blkz.type = zone->type;
224 blkz.cond = zone->cond;
225 blkz.capacity = zone->capacity;
226 null_unlock_zone(dev, zone);
227
228 error = cb(&blkz, i, data);
229 if (error)
230 return error;
231 }
232
233 return nr_zones;
234 }
235
236 /*
237 * This is called in the case of memory backing from null_process_cmd()
238 * with the target zone already locked.
239 */
null_zone_valid_read_len(struct nullb * nullb,sector_t sector,unsigned int len)240 size_t null_zone_valid_read_len(struct nullb *nullb,
241 sector_t sector, unsigned int len)
242 {
243 struct nullb_device *dev = nullb->dev;
244 struct nullb_zone *zone = &dev->zones[null_zone_no(dev, sector)];
245 unsigned int nr_sectors = len >> SECTOR_SHIFT;
246
247 /* Read must be below the write pointer position */
248 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
249 sector + nr_sectors <= zone->wp)
250 return len;
251
252 if (sector > zone->wp)
253 return 0;
254
255 return (zone->wp - sector) << SECTOR_SHIFT;
256 }
257
null_close_imp_open_zone(struct nullb_device * dev)258 static void null_close_imp_open_zone(struct nullb_device *dev)
259 {
260 struct nullb_zone *zone;
261 unsigned int zno, i;
262
263 zno = dev->imp_close_zone_no;
264 if (zno >= dev->nr_zones)
265 zno = dev->zone_nr_conv;
266
267 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
268 zone = &dev->zones[zno];
269 zno++;
270 if (zno >= dev->nr_zones)
271 zno = dev->zone_nr_conv;
272
273 if (zone->cond == BLK_ZONE_COND_IMP_OPEN) {
274 dev->nr_zones_imp_open--;
275 if (zone->wp == zone->start) {
276 zone->cond = BLK_ZONE_COND_EMPTY;
277 } else {
278 zone->cond = BLK_ZONE_COND_CLOSED;
279 dev->nr_zones_closed++;
280 }
281 dev->imp_close_zone_no = zno;
282 return;
283 }
284 }
285 }
286
null_check_active(struct nullb_device * dev)287 static blk_status_t null_check_active(struct nullb_device *dev)
288 {
289 if (!dev->zone_max_active)
290 return BLK_STS_OK;
291
292 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open +
293 dev->nr_zones_closed < dev->zone_max_active)
294 return BLK_STS_OK;
295
296 return BLK_STS_ZONE_ACTIVE_RESOURCE;
297 }
298
null_check_open(struct nullb_device * dev)299 static blk_status_t null_check_open(struct nullb_device *dev)
300 {
301 if (!dev->zone_max_open)
302 return BLK_STS_OK;
303
304 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open < dev->zone_max_open)
305 return BLK_STS_OK;
306
307 if (dev->nr_zones_imp_open) {
308 if (null_check_active(dev) == BLK_STS_OK) {
309 null_close_imp_open_zone(dev);
310 return BLK_STS_OK;
311 }
312 }
313
314 return BLK_STS_ZONE_OPEN_RESOURCE;
315 }
316
317 /*
318 * This function matches the manage open zone resources function in the ZBC standard,
319 * with the addition of max active zones support (added in the ZNS standard).
320 *
321 * The function determines if a zone can transition to implicit open or explicit open,
322 * while maintaining the max open zone (and max active zone) limit(s). It may close an
323 * implicit open zone in order to make additional zone resources available.
324 *
325 * ZBC states that an implicit open zone shall be closed only if there is not
326 * room within the open limit. However, with the addition of an active limit,
327 * it is not certain that closing an implicit open zone will allow a new zone
328 * to be opened, since we might already be at the active limit capacity.
329 */
null_check_zone_resources(struct nullb_device * dev,struct nullb_zone * zone)330 static blk_status_t null_check_zone_resources(struct nullb_device *dev,
331 struct nullb_zone *zone)
332 {
333 blk_status_t ret;
334
335 switch (zone->cond) {
336 case BLK_ZONE_COND_EMPTY:
337 ret = null_check_active(dev);
338 if (ret != BLK_STS_OK)
339 return ret;
340 fallthrough;
341 case BLK_ZONE_COND_CLOSED:
342 return null_check_open(dev);
343 default:
344 /* Should never be called for other states */
345 WARN_ON(1);
346 return BLK_STS_IOERR;
347 }
348 }
349
null_zone_write(struct nullb_cmd * cmd,sector_t sector,unsigned int nr_sectors,bool append)350 static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
351 unsigned int nr_sectors, bool append)
352 {
353 struct nullb_device *dev = cmd->nq->dev;
354 unsigned int zno = null_zone_no(dev, sector);
355 struct nullb_zone *zone = &dev->zones[zno];
356 blk_status_t ret;
357
358 trace_nullb_zone_op(cmd, zno, zone->cond);
359
360 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) {
361 if (append)
362 return BLK_STS_IOERR;
363 return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
364 }
365
366 null_lock_zone(dev, zone);
367
368 /*
369 * Regular writes must be at the write pointer position. Zone append
370 * writes are automatically issued at the write pointer and the position
371 * returned using the request sector. Note that we do not check the zone
372 * condition because for FULL, READONLY and OFFLINE zones, the sector
373 * check against the zone write pointer will always result in failing
374 * the command.
375 */
376 if (append) {
377 if (WARN_ON_ONCE(!dev->zone_append_max_sectors) ||
378 zone->wp == NULL_ZONE_INVALID_WP) {
379 ret = BLK_STS_IOERR;
380 goto unlock_zone;
381 }
382 sector = zone->wp;
383 blk_mq_rq_from_pdu(cmd)->__sector = sector;
384 }
385
386 if (sector != zone->wp ||
387 zone->wp + nr_sectors > zone->start + zone->capacity) {
388 ret = BLK_STS_IOERR;
389 goto unlock_zone;
390 }
391
392 if (zone->cond == BLK_ZONE_COND_CLOSED ||
393 zone->cond == BLK_ZONE_COND_EMPTY) {
394 if (dev->need_zone_res_mgmt) {
395 spin_lock(&dev->zone_res_lock);
396
397 ret = null_check_zone_resources(dev, zone);
398 if (ret != BLK_STS_OK) {
399 spin_unlock(&dev->zone_res_lock);
400 goto unlock_zone;
401 }
402 if (zone->cond == BLK_ZONE_COND_CLOSED) {
403 dev->nr_zones_closed--;
404 dev->nr_zones_imp_open++;
405 } else if (zone->cond == BLK_ZONE_COND_EMPTY) {
406 dev->nr_zones_imp_open++;
407 }
408
409 spin_unlock(&dev->zone_res_lock);
410 }
411
412 zone->cond = BLK_ZONE_COND_IMP_OPEN;
413 }
414
415 ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
416 if (ret != BLK_STS_OK)
417 goto unlock_zone;
418
419 zone->wp += nr_sectors;
420 if (zone->wp == zone->start + zone->capacity) {
421 if (dev->need_zone_res_mgmt) {
422 spin_lock(&dev->zone_res_lock);
423 if (zone->cond == BLK_ZONE_COND_EXP_OPEN)
424 dev->nr_zones_exp_open--;
425 else if (zone->cond == BLK_ZONE_COND_IMP_OPEN)
426 dev->nr_zones_imp_open--;
427 spin_unlock(&dev->zone_res_lock);
428 }
429 zone->cond = BLK_ZONE_COND_FULL;
430 }
431
432 ret = BLK_STS_OK;
433
434 unlock_zone:
435 null_unlock_zone(dev, zone);
436
437 return ret;
438 }
439
null_open_zone(struct nullb_device * dev,struct nullb_zone * zone)440 static blk_status_t null_open_zone(struct nullb_device *dev,
441 struct nullb_zone *zone)
442 {
443 blk_status_t ret = BLK_STS_OK;
444
445 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
446 return BLK_STS_IOERR;
447
448 switch (zone->cond) {
449 case BLK_ZONE_COND_EXP_OPEN:
450 /* Open operation on exp open is not an error */
451 return BLK_STS_OK;
452 case BLK_ZONE_COND_EMPTY:
453 case BLK_ZONE_COND_IMP_OPEN:
454 case BLK_ZONE_COND_CLOSED:
455 break;
456 case BLK_ZONE_COND_FULL:
457 default:
458 return BLK_STS_IOERR;
459 }
460
461 if (dev->need_zone_res_mgmt) {
462 spin_lock(&dev->zone_res_lock);
463
464 switch (zone->cond) {
465 case BLK_ZONE_COND_EMPTY:
466 ret = null_check_zone_resources(dev, zone);
467 if (ret != BLK_STS_OK) {
468 spin_unlock(&dev->zone_res_lock);
469 return ret;
470 }
471 break;
472 case BLK_ZONE_COND_IMP_OPEN:
473 dev->nr_zones_imp_open--;
474 break;
475 case BLK_ZONE_COND_CLOSED:
476 ret = null_check_zone_resources(dev, zone);
477 if (ret != BLK_STS_OK) {
478 spin_unlock(&dev->zone_res_lock);
479 return ret;
480 }
481 dev->nr_zones_closed--;
482 break;
483 default:
484 break;
485 }
486
487 dev->nr_zones_exp_open++;
488
489 spin_unlock(&dev->zone_res_lock);
490 }
491
492 zone->cond = BLK_ZONE_COND_EXP_OPEN;
493
494 return BLK_STS_OK;
495 }
496
null_close_zone(struct nullb_device * dev,struct nullb_zone * zone)497 static blk_status_t null_close_zone(struct nullb_device *dev,
498 struct nullb_zone *zone)
499 {
500 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
501 return BLK_STS_IOERR;
502
503 switch (zone->cond) {
504 case BLK_ZONE_COND_CLOSED:
505 /* close operation on closed is not an error */
506 return BLK_STS_OK;
507 case BLK_ZONE_COND_IMP_OPEN:
508 case BLK_ZONE_COND_EXP_OPEN:
509 break;
510 case BLK_ZONE_COND_EMPTY:
511 case BLK_ZONE_COND_FULL:
512 default:
513 return BLK_STS_IOERR;
514 }
515
516 if (dev->need_zone_res_mgmt) {
517 spin_lock(&dev->zone_res_lock);
518
519 switch (zone->cond) {
520 case BLK_ZONE_COND_IMP_OPEN:
521 dev->nr_zones_imp_open--;
522 break;
523 case BLK_ZONE_COND_EXP_OPEN:
524 dev->nr_zones_exp_open--;
525 break;
526 default:
527 break;
528 }
529
530 if (zone->wp > zone->start)
531 dev->nr_zones_closed++;
532
533 spin_unlock(&dev->zone_res_lock);
534 }
535
536 if (zone->wp == zone->start)
537 zone->cond = BLK_ZONE_COND_EMPTY;
538 else
539 zone->cond = BLK_ZONE_COND_CLOSED;
540
541 return BLK_STS_OK;
542 }
543
null_finish_zone(struct nullb_device * dev,struct nullb_zone * zone)544 static blk_status_t null_finish_zone(struct nullb_device *dev,
545 struct nullb_zone *zone)
546 {
547 blk_status_t ret = BLK_STS_OK;
548
549 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
550 return BLK_STS_IOERR;
551
552 if (dev->need_zone_res_mgmt) {
553 spin_lock(&dev->zone_res_lock);
554
555 switch (zone->cond) {
556 case BLK_ZONE_COND_FULL:
557 /* Finish operation on full is not an error */
558 spin_unlock(&dev->zone_res_lock);
559 return BLK_STS_OK;
560 case BLK_ZONE_COND_EMPTY:
561 ret = null_check_zone_resources(dev, zone);
562 if (ret != BLK_STS_OK) {
563 spin_unlock(&dev->zone_res_lock);
564 return ret;
565 }
566 break;
567 case BLK_ZONE_COND_IMP_OPEN:
568 dev->nr_zones_imp_open--;
569 break;
570 case BLK_ZONE_COND_EXP_OPEN:
571 dev->nr_zones_exp_open--;
572 break;
573 case BLK_ZONE_COND_CLOSED:
574 ret = null_check_zone_resources(dev, zone);
575 if (ret != BLK_STS_OK) {
576 spin_unlock(&dev->zone_res_lock);
577 return ret;
578 }
579 dev->nr_zones_closed--;
580 break;
581 default:
582 spin_unlock(&dev->zone_res_lock);
583 return BLK_STS_IOERR;
584 }
585
586 spin_unlock(&dev->zone_res_lock);
587 }
588
589 zone->cond = BLK_ZONE_COND_FULL;
590 zone->wp = zone->start + zone->len;
591
592 return BLK_STS_OK;
593 }
594
null_reset_zone(struct nullb_device * dev,struct nullb_zone * zone)595 static blk_status_t null_reset_zone(struct nullb_device *dev,
596 struct nullb_zone *zone)
597 {
598 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
599 return BLK_STS_IOERR;
600
601 if (dev->need_zone_res_mgmt) {
602 spin_lock(&dev->zone_res_lock);
603
604 switch (zone->cond) {
605 case BLK_ZONE_COND_IMP_OPEN:
606 dev->nr_zones_imp_open--;
607 break;
608 case BLK_ZONE_COND_EXP_OPEN:
609 dev->nr_zones_exp_open--;
610 break;
611 case BLK_ZONE_COND_CLOSED:
612 dev->nr_zones_closed--;
613 break;
614 case BLK_ZONE_COND_EMPTY:
615 case BLK_ZONE_COND_FULL:
616 break;
617 default:
618 spin_unlock(&dev->zone_res_lock);
619 return BLK_STS_IOERR;
620 }
621
622 spin_unlock(&dev->zone_res_lock);
623 }
624
625 zone->cond = BLK_ZONE_COND_EMPTY;
626 zone->wp = zone->start;
627
628 if (dev->memory_backed)
629 return null_handle_discard(dev, zone->start, zone->len);
630
631 return BLK_STS_OK;
632 }
633
null_zone_mgmt(struct nullb_cmd * cmd,enum req_op op,sector_t sector)634 static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_op op,
635 sector_t sector)
636 {
637 struct nullb_device *dev = cmd->nq->dev;
638 unsigned int zone_no;
639 struct nullb_zone *zone;
640 blk_status_t ret;
641 size_t i;
642
643 if (op == REQ_OP_ZONE_RESET_ALL) {
644 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
645 zone = &dev->zones[i];
646 null_lock_zone(dev, zone);
647 if (zone->cond != BLK_ZONE_COND_EMPTY &&
648 zone->cond != BLK_ZONE_COND_READONLY &&
649 zone->cond != BLK_ZONE_COND_OFFLINE) {
650 null_reset_zone(dev, zone);
651 trace_nullb_zone_op(cmd, i, zone->cond);
652 }
653 null_unlock_zone(dev, zone);
654 }
655 return BLK_STS_OK;
656 }
657
658 zone_no = null_zone_no(dev, sector);
659 zone = &dev->zones[zone_no];
660
661 null_lock_zone(dev, zone);
662
663 if (zone->cond == BLK_ZONE_COND_READONLY ||
664 zone->cond == BLK_ZONE_COND_OFFLINE) {
665 ret = BLK_STS_IOERR;
666 goto unlock;
667 }
668
669 switch (op) {
670 case REQ_OP_ZONE_RESET:
671 ret = null_reset_zone(dev, zone);
672 break;
673 case REQ_OP_ZONE_OPEN:
674 ret = null_open_zone(dev, zone);
675 break;
676 case REQ_OP_ZONE_CLOSE:
677 ret = null_close_zone(dev, zone);
678 break;
679 case REQ_OP_ZONE_FINISH:
680 ret = null_finish_zone(dev, zone);
681 break;
682 default:
683 ret = BLK_STS_NOTSUPP;
684 break;
685 }
686
687 if (ret == BLK_STS_OK)
688 trace_nullb_zone_op(cmd, zone_no, zone->cond);
689
690 unlock:
691 null_unlock_zone(dev, zone);
692
693 return ret;
694 }
695
null_process_zoned_cmd(struct nullb_cmd * cmd,enum req_op op,sector_t sector,sector_t nr_sectors)696 blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_op op,
697 sector_t sector, sector_t nr_sectors)
698 {
699 struct nullb_device *dev;
700 struct nullb_zone *zone;
701 blk_status_t sts;
702
703 switch (op) {
704 case REQ_OP_WRITE:
705 return null_zone_write(cmd, sector, nr_sectors, false);
706 case REQ_OP_ZONE_APPEND:
707 return null_zone_write(cmd, sector, nr_sectors, true);
708 case REQ_OP_ZONE_RESET:
709 case REQ_OP_ZONE_RESET_ALL:
710 case REQ_OP_ZONE_OPEN:
711 case REQ_OP_ZONE_CLOSE:
712 case REQ_OP_ZONE_FINISH:
713 return null_zone_mgmt(cmd, op, sector);
714 default:
715 dev = cmd->nq->dev;
716 zone = &dev->zones[null_zone_no(dev, sector)];
717 if (zone->cond == BLK_ZONE_COND_OFFLINE)
718 return BLK_STS_IOERR;
719
720 null_lock_zone(dev, zone);
721 sts = null_process_cmd(cmd, op, sector, nr_sectors);
722 null_unlock_zone(dev, zone);
723 return sts;
724 }
725 }
726
727 /*
728 * Set a zone in the read-only or offline condition.
729 */
null_set_zone_cond(struct nullb_device * dev,struct nullb_zone * zone,enum blk_zone_cond cond)730 static void null_set_zone_cond(struct nullb_device *dev,
731 struct nullb_zone *zone, enum blk_zone_cond cond)
732 {
733 if (WARN_ON_ONCE(cond != BLK_ZONE_COND_READONLY &&
734 cond != BLK_ZONE_COND_OFFLINE))
735 return;
736
737 null_lock_zone(dev, zone);
738
739 /*
740 * If the read-only condition is requested again to zones already in
741 * read-only condition, restore back normal empty condition. Do the same
742 * if the offline condition is requested for offline zones. Otherwise,
743 * set the specified zone condition to the zones. Finish the zones
744 * beforehand to free up zone resources.
745 */
746 if (zone->cond == cond) {
747 zone->cond = BLK_ZONE_COND_EMPTY;
748 zone->wp = zone->start;
749 if (dev->memory_backed)
750 null_handle_discard(dev, zone->start, zone->len);
751 } else {
752 if (zone->cond != BLK_ZONE_COND_READONLY &&
753 zone->cond != BLK_ZONE_COND_OFFLINE)
754 null_finish_zone(dev, zone);
755 zone->cond = cond;
756 zone->wp = NULL_ZONE_INVALID_WP;
757 }
758
759 null_unlock_zone(dev, zone);
760 }
761
762 /*
763 * Identify a zone from the sector written to configfs file. Then set zone
764 * condition to the zone.
765 */
zone_cond_store(struct nullb_device * dev,const char * page,size_t count,enum blk_zone_cond cond)766 ssize_t zone_cond_store(struct nullb_device *dev, const char *page,
767 size_t count, enum blk_zone_cond cond)
768 {
769 unsigned long long sector;
770 unsigned int zone_no;
771 int ret;
772
773 if (!dev->zoned) {
774 pr_err("null_blk device is not zoned\n");
775 return -EINVAL;
776 }
777
778 if (!dev->zones) {
779 pr_err("null_blk device is not yet powered\n");
780 return -EINVAL;
781 }
782
783 ret = kstrtoull(page, 0, §or);
784 if (ret < 0)
785 return ret;
786
787 zone_no = null_zone_no(dev, sector);
788 if (zone_no >= dev->nr_zones) {
789 pr_err("Sector out of range\n");
790 return -EINVAL;
791 }
792
793 if (dev->zones[zone_no].type == BLK_ZONE_TYPE_CONVENTIONAL) {
794 pr_err("Can not change condition of conventional zones\n");
795 return -EINVAL;
796 }
797
798 null_set_zone_cond(dev, &dev->zones[zone_no], cond);
799
800 return count;
801 }
802