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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
[linux-2.6-block.git] / drivers / block / null_blk / zoned.c
CommitLineData
ca4b2a01
MB		 1// SPDX-License-Identifier: GPL-2.0
2#include <linux/vmalloc.h>
aa1c09cb 3#include <linux/bitmap.h>
ca4b2a01
MB		 4#include "null_blk.h"
5
766c3297 6#define CREATE_TRACE_POINTS
eebf34a8 7#include "trace.h"
766c3297 8
cd92cdb9
DLM		 9static inline sector_t mb_to_sects(unsigned long mb)
10{
11 return ((sector_t)mb * SZ_1M) >> SECTOR_SHIFT;
12}
ca4b2a01
MB		 13
14static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
15{
16 return sect >> ilog2(dev->zone_size_sects);
17}
18
2b8b7ed7
DLM		 19static inline void null_lock_zone_res(struct nullb_device *dev)
20{
21 if (dev->need_zone_res_mgmt)
22 spin_lock_irq(&dev->zone_res_lock);
23}
24
25static inline void null_unlock_zone_res(struct nullb_device *dev)
26{
27 if (dev->need_zone_res_mgmt)
28 spin_unlock_irq(&dev->zone_res_lock);
29}
30
31static inline void null_init_zone_lock(struct nullb_device *dev,
32 struct nullb_zone *zone)
33{
34 if (!dev->memory_backed)
35 spin_lock_init(&zone->spinlock);
36 else
37 mutex_init(&zone->mutex);
38}
39
40static inline void null_lock_zone(struct nullb_device *dev,
41 struct nullb_zone *zone)
42{
43 if (!dev->memory_backed)
44 spin_lock_irq(&zone->spinlock);
45 else
46 mutex_lock(&zone->mutex);
47}
48
49static inline void null_unlock_zone(struct nullb_device *dev,
50 struct nullb_zone *zone)
51{
52 if (!dev->memory_backed)
53 spin_unlock_irq(&zone->spinlock);
54 else
55 mutex_unlock(&zone->mutex);
56}
57
d205bde7 58int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q)
ca4b2a01 59{
0ebcdd70 60 sector_t dev_capacity_sects, zone_capacity_sects;
2b8b7ed7 61 struct nullb_zone *zone;
ca4b2a01
MB		 62 sector_t sector = 0;
63 unsigned int i;
64
65 if (!is_power_of_2(dev->zone_size)) {
9c7eddf1 66 pr_err("zone_size must be power-of-two\n");
ca4b2a01
MB		 67 return -EINVAL;
68 }
e2748325
CK		 69 if (dev->zone_size > dev->size) {
70 pr_err("Zone size larger than device capacity\n");
71 return -EINVAL;
72 }
ca4b2a01 73
089565fb
AR		 74 if (!dev->zone_capacity)
75 dev->zone_capacity = dev->zone_size;
76
77 if (dev->zone_capacity > dev->zone_size) {
78 pr_err("null_blk: zone capacity (%lu MB) larger than zone size (%lu MB)\n",
79 dev->zone_capacity, dev->zone_size);
80 return -EINVAL;
81 }
82
cd92cdb9
DLM		 83 zone_capacity_sects = mb_to_sects(dev->zone_capacity);
84 dev_capacity_sects = mb_to_sects(dev->size);
85 dev->zone_size_sects = mb_to_sects(dev->zone_size);
86 dev->nr_zones = round_up(dev_capacity_sects, dev->zone_size_sects)
87 >> ilog2(dev->zone_size_sects);
0ebcdd70 88
2b8b7ed7
DLM		 89 dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct nullb_zone),
90 GFP_KERNEL | __GFP_ZERO);
ca4b2a01
MB		 91 if (!dev->zones)
92 return -ENOMEM;
93
2b8b7ed7 94 spin_lock_init(&dev->zone_res_lock);
aa1c09cb 95
ea2c18e1
MS		 96 if (dev->zone_nr_conv >= dev->nr_zones) {
97 dev->zone_nr_conv = dev->nr_zones - 1;
9c7eddf1 98 pr_info("changed the number of conventional zones to %u",
ea2c18e1
MS		 99 dev->zone_nr_conv);
100 }
101
dc4d137e
NC		 102 /* Max active zones has to be < nbr of seq zones in order to be enforceable */
103 if (dev->zone_max_active >= dev->nr_zones - dev->zone_nr_conv) {
104 dev->zone_max_active = 0;
105 pr_info("zone_max_active limit disabled, limit >= zone count\n");
106 }
107
108 /* Max open zones has to be <= max active zones */
109 if (dev->zone_max_active && dev->zone_max_open > dev->zone_max_active) {
110 dev->zone_max_open = dev->zone_max_active;
111 pr_info("changed the maximum number of open zones to %u\n",
112 dev->nr_zones);
113 } else if (dev->zone_max_open >= dev->nr_zones - dev->zone_nr_conv) {
114 dev->zone_max_open = 0;
115 pr_info("zone_max_open limit disabled, limit >= zone count\n");
116 }
2b8b7ed7 117 dev->need_zone_res_mgmt = dev->zone_max_active || dev->zone_max_open;
2e8c6e0e 118 dev->imp_close_zone_no = dev->zone_nr_conv;
dc4d137e 119
ea2c18e1 120 for (i = 0; i < dev->zone_nr_conv; i++) {
2b8b7ed7 121 zone = &dev->zones[i];
ea2c18e1 122
2b8b7ed7 123 null_init_zone_lock(dev, zone);
ea2c18e1
MS		 124 zone->start = sector;
125 zone->len = dev->zone_size_sects;
82394db7 126 zone->capacity = zone->len;
ea2c18e1
MS		 127 zone->wp = zone->start + zone->len;
128 zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
129 zone->cond = BLK_ZONE_COND_NOT_WP;
130
131 sector += dev->zone_size_sects;
132 }
133
134 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
2b8b7ed7 135 zone = &dev->zones[i];
ca4b2a01 136
2b8b7ed7 137 null_init_zone_lock(dev, zone);
ca4b2a01 138 zone->start = zone->wp = sector;
0ebcdd70
DLM		 139 if (zone->start + dev->zone_size_sects > dev_capacity_sects)
140 zone->len = dev_capacity_sects - zone->start;
141 else
142 zone->len = dev->zone_size_sects;
143 zone->capacity =
144 min_t(sector_t, zone->len, zone_capacity_sects);
ca4b2a01
MB		 145 zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
146 zone->cond = BLK_ZONE_COND_EMPTY;
147
148 sector += dev->zone_size_sects;
149 }
150
d205bde7
DLM		 151 return 0;
152}
153
154int null_register_zoned_dev(struct nullb *nullb)
155{
e0489ed5 156 struct nullb_device *dev = nullb->dev;
d205bde7
DLM		 157 struct request_queue *q = nullb->q;
158
5752dc78
DLM		 159 blk_queue_set_zoned(nullb->disk, BLK_ZONED_HM);
160 blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
161 blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
162
e0489ed5
DLM		 163 if (queue_is_mq(q)) {
164 int ret = blk_revalidate_disk_zones(nullb->disk, NULL);
165
166 if (ret)
167 return ret;
168 } else {
169 blk_queue_chunk_sectors(q, dev->zone_size_sects);
170 q->nr_zones = blkdev_nr_zones(nullb->disk);
171 }
d205bde7 172
e0489ed5 173 blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
dc4d137e
NC		 174 blk_queue_max_open_zones(q, dev->zone_max_open);
175 blk_queue_max_active_zones(q, dev->zone_max_active);
d205bde7 176
ca4b2a01
MB		 177 return 0;
178}
179
d205bde7 180void null_free_zoned_dev(struct nullb_device *dev)
ca4b2a01
MB		 181{
182 kvfree(dev->zones);
72ce11dd 183 dev->zones = NULL;
ca4b2a01
MB		 184}
185
7fc8fb51 186int null_report_zones(struct gendisk *disk, sector_t sector,
d4100351 187 unsigned int nr_zones, report_zones_cb cb, void *data)
ca4b2a01 188{
e76239a3
CH		 189 struct nullb *nullb = disk->private_data;
190 struct nullb_device *dev = nullb->dev;
2b8b7ed7
DLM		 191 unsigned int first_zone, i;
192 struct nullb_zone *zone;
193 struct blk_zone blkz;
d4100351 194 int error;
ca4b2a01 195
d4100351
CH		 196 first_zone = null_zone_no(dev, sector);
197 if (first_zone >= dev->nr_zones)
198 return 0;
ca4b2a01 199
d4100351 200 nr_zones = min(nr_zones, dev->nr_zones - first_zone);
766c3297
CK		 201 trace_nullb_report_zones(nullb, nr_zones);
202
2b8b7ed7
DLM		 203 memset(&blkz, 0, sizeof(struct blk_zone));
204 zone = &dev->zones[first_zone];
205 for (i = 0; i < nr_zones; i++, zone++) {
d4100351
CH		 206 /*
207 * Stacked DM target drivers will remap the zone information by
208 * modifying the zone information passed to the report callback.
209 * So use a local copy to avoid corruption of the device zone
210 * array.
211 */
2b8b7ed7
DLM		 212 null_lock_zone(dev, zone);
213 blkz.start = zone->start;
214 blkz.len = zone->len;
215 blkz.wp = zone->wp;
216 blkz.type = zone->type;
217 blkz.cond = zone->cond;
218 blkz.capacity = zone->capacity;
219 null_unlock_zone(dev, zone);
220
221 error = cb(&blkz, i, data);
d4100351
CH		 222 if (error)
223 return error;
224 }
ca4b2a01 225
d4100351 226 return nr_zones;
ca4b2a01
MB		 227}
228
aa1c09cb
DLM		 229/*
230 * This is called in the case of memory backing from null_process_cmd()
231 * with the target zone already locked.
232 */
dd85b492
AJ		 233size_t null_zone_valid_read_len(struct nullb *nullb,
234 sector_t sector, unsigned int len)
235{
236 struct nullb_device *dev = nullb->dev;
2b8b7ed7 237 struct nullb_zone *zone = &dev->zones[null_zone_no(dev, sector)];
dd85b492
AJ		 238 unsigned int nr_sectors = len >> SECTOR_SHIFT;
239
240 /* Read must be below the write pointer position */
241 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
242 sector + nr_sectors <= zone->wp)
243 return len;
244
245 if (sector > zone->wp)
246 return 0;
247
248 return (zone->wp - sector) << SECTOR_SHIFT;
249}
250
2b8b7ed7
DLM		 251static blk_status_t __null_close_zone(struct nullb_device *dev,
252 struct nullb_zone *zone)
dc4d137e 253{
dc4d137e
NC		 254 switch (zone->cond) {
255 case BLK_ZONE_COND_CLOSED:
256 /* close operation on closed is not an error */
257 return BLK_STS_OK;
258 case BLK_ZONE_COND_IMP_OPEN:
259 dev->nr_zones_imp_open--;
260 break;
261 case BLK_ZONE_COND_EXP_OPEN:
262 dev->nr_zones_exp_open--;
263 break;
264 case BLK_ZONE_COND_EMPTY:
265 case BLK_ZONE_COND_FULL:
266 default:
267 return BLK_STS_IOERR;
268 }
269
270 if (zone->wp == zone->start) {
271 zone->cond = BLK_ZONE_COND_EMPTY;
272 } else {
273 zone->cond = BLK_ZONE_COND_CLOSED;
274 dev->nr_zones_closed++;
275 }
276
277 return BLK_STS_OK;
278}
279
2e8c6e0e 280static void null_close_imp_open_zone(struct nullb_device *dev)
dc4d137e 281{
2e8c6e0e
DLM		 282 struct nullb_zone *zone;
283 unsigned int zno, i;
284
285 zno = dev->imp_close_zone_no;
286 if (zno >= dev->nr_zones)
287 zno = dev->zone_nr_conv;
dc4d137e
NC		 288
289 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
2e8c6e0e
DLM		 290 zone = &dev->zones[zno];
291 zno++;
292 if (zno >= dev->nr_zones)
293 zno = dev->zone_nr_conv;
294
295 if (zone->cond == BLK_ZONE_COND_IMP_OPEN) {
296 __null_close_zone(dev, zone);
297 dev->imp_close_zone_no = zno;
dc4d137e
NC		 298 return;
299 }
300 }
301}
302
fd78874b 303static blk_status_t null_check_active(struct nullb_device *dev)
dc4d137e
NC		 304{
305 if (!dev->zone_max_active)
fd78874b
KB		 306 return BLK_STS_OK;
307
308 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open +
309 dev->nr_zones_closed < dev->zone_max_active)
310 return BLK_STS_OK;
dc4d137e 311
fd78874b 312 return BLK_STS_ZONE_ACTIVE_RESOURCE;
dc4d137e
NC		 313}
314
fd78874b 315static blk_status_t null_check_open(struct nullb_device *dev)
dc4d137e
NC		 316{
317 if (!dev->zone_max_open)
fd78874b 318 return BLK_STS_OK;
dc4d137e
NC		 319
320 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open < dev->zone_max_open)
fd78874b 321 return BLK_STS_OK;
dc4d137e 322
fd78874b
KB		 323 if (dev->nr_zones_imp_open) {
324 if (null_check_active(dev) == BLK_STS_OK) {
2e8c6e0e 325 null_close_imp_open_zone(dev);
fd78874b
KB		 326 return BLK_STS_OK;
327 }
dc4d137e
NC		 328 }
329
fd78874b 330 return BLK_STS_ZONE_OPEN_RESOURCE;
dc4d137e
NC		 331}
332
333/*
334 * This function matches the manage open zone resources function in the ZBC standard,
335 * with the addition of max active zones support (added in the ZNS standard).
336 *
337 * The function determines if a zone can transition to implicit open or explicit open,
338 * while maintaining the max open zone (and max active zone) limit(s). It may close an
339 * implicit open zone in order to make additional zone resources available.
340 *
341 * ZBC states that an implicit open zone shall be closed only if there is not
342 * room within the open limit. However, with the addition of an active limit,
343 * it is not certain that closing an implicit open zone will allow a new zone
344 * to be opened, since we might already be at the active limit capacity.
345 */
2b8b7ed7
DLM		 346static blk_status_t null_check_zone_resources(struct nullb_device *dev,
347 struct nullb_zone *zone)
dc4d137e 348{
fd78874b
KB		 349 blk_status_t ret;
350
dc4d137e
NC		 351 switch (zone->cond) {
352 case BLK_ZONE_COND_EMPTY:
fd78874b
KB		 353 ret = null_check_active(dev);
354 if (ret != BLK_STS_OK)
355 return ret;
dc4d137e
NC		 356 fallthrough;
357 case BLK_ZONE_COND_CLOSED:
fd78874b 358 return null_check_open(dev);
dc4d137e
NC		 359 default:
360 /* Should never be called for other states */
361 WARN_ON(1);
fd78874b 362 return BLK_STS_IOERR;
dc4d137e
NC		 363 }
364}
365
fceb5d1b 366static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
e0489ed5 367 unsigned int nr_sectors, bool append)
ca4b2a01
MB		 368{
369 struct nullb_device *dev = cmd->nq->dev;
ca4b2a01 370 unsigned int zno = null_zone_no(dev, sector);
2b8b7ed7 371 struct nullb_zone *zone = &dev->zones[zno];
9dd44c7e
DLM		 372 blk_status_t ret;
373
374 trace_nullb_zone_op(cmd, zno, zone->cond);
375
2e896d89
DLM		 376 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) {
377 if (append)
378 return BLK_STS_IOERR;
9dd44c7e 379 return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
2e896d89 380 }
ca4b2a01 381
2b8b7ed7 382 null_lock_zone(dev, zone);
aa1c09cb 383
2b8b7ed7 384 if (zone->cond == BLK_ZONE_COND_FULL) {
ca4b2a01 385 /* Cannot write to a full zone */
aa1c09cb
DLM		 386 ret = BLK_STS_IOERR;
387 goto unlock;
dc4d137e
NC		 388 }
389
390 /*
391 * Regular writes must be at the write pointer position.
392 * Zone append writes are automatically issued at the write
393 * pointer and the position returned using the request or BIO
394 * sector.
395 */
396 if (append) {
397 sector = zone->wp;
398 if (cmd->bio)
399 cmd->bio->bi_iter.bi_sector = sector;
400 else
401 cmd->rq->__sector = sector;
402 } else if (sector != zone->wp) {
aa1c09cb
DLM		 403 ret = BLK_STS_IOERR;
404 goto unlock;
dc4d137e
NC		 405 }
406
aa1c09cb
DLM		 407 if (zone->wp + nr_sectors > zone->start + zone->capacity) {
408 ret = BLK_STS_IOERR;
409 goto unlock;
410 }
dc4d137e 411
2b8b7ed7
DLM		 412 if (zone->cond == BLK_ZONE_COND_CLOSED ||
413 zone->cond == BLK_ZONE_COND_EMPTY) {
414 null_lock_zone_res(dev);
415
416 ret = null_check_zone_resources(dev, zone);
417 if (ret != BLK_STS_OK) {
418 null_unlock_zone_res(dev);
419 goto unlock;
420 }
421 if (zone->cond == BLK_ZONE_COND_CLOSED) {
422 dev->nr_zones_closed--;
423 dev->nr_zones_imp_open++;
424 } else if (zone->cond == BLK_ZONE_COND_EMPTY) {
425 dev->nr_zones_imp_open++;
426 }
427
428 if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
429 zone->cond = BLK_ZONE_COND_IMP_OPEN;
430
431 null_unlock_zone_res(dev);
dc4d137e 432 }
dc4d137e
NC		 433
434 ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
435 if (ret != BLK_STS_OK)
aa1c09cb 436 goto unlock;
dc4d137e
NC		 437
438 zone->wp += nr_sectors;
439 if (zone->wp == zone->start + zone->capacity) {
2b8b7ed7 440 null_lock_zone_res(dev);
dc4d137e
NC		 441 if (zone->cond == BLK_ZONE_COND_EXP_OPEN)
442 dev->nr_zones_exp_open--;
443 else if (zone->cond == BLK_ZONE_COND_IMP_OPEN)
444 dev->nr_zones_imp_open--;
445 zone->cond = BLK_ZONE_COND_FULL;
2b8b7ed7 446 null_unlock_zone_res(dev);
dc4d137e 447 }
2b8b7ed7 448
aa1c09cb
DLM		 449 ret = BLK_STS_OK;
450
451unlock:
2b8b7ed7 452 null_unlock_zone(dev, zone);
aa1c09cb
DLM		 453
454 return ret;
dc4d137e
NC		 455}
456
2b8b7ed7
DLM		 457static blk_status_t null_open_zone(struct nullb_device *dev,
458 struct nullb_zone *zone)
dc4d137e 459{
2b8b7ed7 460 blk_status_t ret = BLK_STS_OK;
fd78874b 461
dc4d137e
NC		 462 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
463 return BLK_STS_IOERR;
464
2b8b7ed7
DLM		 465 null_lock_zone_res(dev);
466
dc4d137e
NC		 467 switch (zone->cond) {
468 case BLK_ZONE_COND_EXP_OPEN:
469 /* open operation on exp open is not an error */
2b8b7ed7 470 goto unlock;
dc4d137e 471 case BLK_ZONE_COND_EMPTY:
fd78874b
KB		 472 ret = null_check_zone_resources(dev, zone);
473 if (ret != BLK_STS_OK)
2b8b7ed7 474 goto unlock;
dc4d137e
NC		 475 break;
476 case BLK_ZONE_COND_IMP_OPEN:
477 dev->nr_zones_imp_open--;
478 break;
16c731fe 479 case BLK_ZONE_COND_CLOSED:
fd78874b
KB		 480 ret = null_check_zone_resources(dev, zone);
481 if (ret != BLK_STS_OK)
2b8b7ed7 482 goto unlock;
dc4d137e
NC		 483 dev->nr_zones_closed--;
484 break;
485 case BLK_ZONE_COND_FULL:
486 default:
2b8b7ed7
DLM		 487 ret = BLK_STS_IOERR;
488 goto unlock;
dc4d137e
NC		 489 }
490
491 zone->cond = BLK_ZONE_COND_EXP_OPEN;
492 dev->nr_zones_exp_open++;
ca4b2a01 493
2b8b7ed7
DLM		 494unlock:
495 null_unlock_zone_res(dev);
496
497 return ret;
dc4d137e
NC		 498}
499
2b8b7ed7
DLM		 500static blk_status_t null_close_zone(struct nullb_device *dev,
501 struct nullb_zone *zone)
dc4d137e 502{
fd78874b
KB		 503 blk_status_t ret;
504
dc4d137e
NC		 505 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
506 return BLK_STS_IOERR;
507
2b8b7ed7
DLM		 508 null_lock_zone_res(dev);
509 ret = __null_close_zone(dev, zone);
510 null_unlock_zone_res(dev);
511
512 return ret;
513}
514
515static blk_status_t null_finish_zone(struct nullb_device *dev,
516 struct nullb_zone *zone)
517{
518 blk_status_t ret = BLK_STS_OK;
519
520 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
521 return BLK_STS_IOERR;
522
523 null_lock_zone_res(dev);
524
dc4d137e
NC		 525 switch (zone->cond) {
526 case BLK_ZONE_COND_FULL:
527 /* finish operation on full is not an error */
2b8b7ed7 528 goto unlock;
dc4d137e 529 case BLK_ZONE_COND_EMPTY:
fd78874b
KB		 530 ret = null_check_zone_resources(dev, zone);
531 if (ret != BLK_STS_OK)
2b8b7ed7 532 goto unlock;
dc4d137e
NC		 533 break;
534 case BLK_ZONE_COND_IMP_OPEN:
535 dev->nr_zones_imp_open--;
536 break;
537 case BLK_ZONE_COND_EXP_OPEN:
538 dev->nr_zones_exp_open--;
539 break;
540 case BLK_ZONE_COND_CLOSED:
fd78874b
KB		 541 ret = null_check_zone_resources(dev, zone);
542 if (ret != BLK_STS_OK)
2b8b7ed7 543 goto unlock;
dc4d137e
NC		 544 dev->nr_zones_closed--;
545 break;
546 default:
2b8b7ed7
DLM		 547 ret = BLK_STS_IOERR;
548 goto unlock;
dc4d137e 549 }
089565fb 550
dc4d137e
NC		 551 zone->cond = BLK_ZONE_COND_FULL;
552 zone->wp = zone->start + zone->len;
ca4b2a01 553
2b8b7ed7
DLM		 554unlock:
555 null_unlock_zone_res(dev);
556
557 return ret;
dc4d137e
NC		 558}
559
2b8b7ed7
DLM		 560static blk_status_t null_reset_zone(struct nullb_device *dev,
561 struct nullb_zone *zone)
dc4d137e
NC		 562{
563 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
564 return BLK_STS_IOERR;
9dd44c7e 565
2b8b7ed7
DLM		 566 null_lock_zone_res(dev);
567
dc4d137e
NC		 568 switch (zone->cond) {
569 case BLK_ZONE_COND_EMPTY:
570 /* reset operation on empty is not an error */
2b8b7ed7 571 null_unlock_zone_res(dev);
9dd44c7e 572 return BLK_STS_OK;
dc4d137e
NC		 573 case BLK_ZONE_COND_IMP_OPEN:
574 dev->nr_zones_imp_open--;
575 break;
576 case BLK_ZONE_COND_EXP_OPEN:
577 dev->nr_zones_exp_open--;
578 break;
579 case BLK_ZONE_COND_CLOSED:
580 dev->nr_zones_closed--;
581 break;
582 case BLK_ZONE_COND_FULL:
583 break;
ca4b2a01 584 default:
2b8b7ed7 585 null_unlock_zone_res(dev);
fceb5d1b 586 return BLK_STS_IOERR;
ca4b2a01 587 }
dc4d137e
NC		 588
589 zone->cond = BLK_ZONE_COND_EMPTY;
590 zone->wp = zone->start;
591
2b8b7ed7
DLM		 592 null_unlock_zone_res(dev);
593
0ec4d913
DLM		 594 if (dev->memory_backed)
595 return null_handle_discard(dev, zone->start, zone->len);
596
dc4d137e 597 return BLK_STS_OK;
ca4b2a01
MB		 598}
599
da644b2c
AJ		 600static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op,
601 sector_t sector)
ca4b2a01
MB		 602{
603 struct nullb_device *dev = cmd->nq->dev;
aa1c09cb 604 unsigned int zone_no;
2b8b7ed7 605 struct nullb_zone *zone;
aa1c09cb 606 blk_status_t ret;
a61dbfb1
CK		 607 size_t i;
608
aa1c09cb 609 if (op == REQ_OP_ZONE_RESET_ALL) {
f9c91042
DLM		 610 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
611 zone = &dev->zones[i];
2b8b7ed7 612 null_lock_zone(dev, zone);
f9c91042
DLM		 613 if (zone->cond != BLK_ZONE_COND_EMPTY) {
614 null_reset_zone(dev, zone);
615 trace_nullb_zone_op(cmd, i, zone->cond);
616 }
2b8b7ed7 617 null_unlock_zone(dev, zone);
f9c91042
DLM		 618 }
619 return BLK_STS_OK;
aa1c09cb
DLM		 620 }
621
622 zone_no = null_zone_no(dev, sector);
623 zone = &dev->zones[zone_no];
624
2b8b7ed7 625 null_lock_zone(dev, zone);
aa1c09cb
DLM		 626
627 switch (op) {
a61dbfb1 628 case REQ_OP_ZONE_RESET:
dc4d137e 629 ret = null_reset_zone(dev, zone);
a61dbfb1 630 break;
da644b2c 631 case REQ_OP_ZONE_OPEN:
dc4d137e 632 ret = null_open_zone(dev, zone);
da644b2c
AJ		 633 break;
634 case REQ_OP_ZONE_CLOSE:
dc4d137e 635 ret = null_close_zone(dev, zone);
da644b2c
AJ		 636 break;
637 case REQ_OP_ZONE_FINISH:
dc4d137e 638 ret = null_finish_zone(dev, zone);
da644b2c 639 break;
a61dbfb1 640 default:
aa1c09cb
DLM		 641 ret = BLK_STS_NOTSUPP;
642 break;
ea2c18e1 643 }
766c3297 644
dc4d137e
NC		 645 if (ret == BLK_STS_OK)
646 trace_nullb_zone_op(cmd, zone_no, zone->cond);
647
2b8b7ed7 648 null_unlock_zone(dev, zone);
aa1c09cb 649
dc4d137e 650 return ret;
fceb5d1b
CK		 651}
652
9dd44c7e
DLM		 653blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op,
654 sector_t sector, sector_t nr_sectors)
fceb5d1b 655{
2b8b7ed7
DLM		 656 struct nullb_device *dev;
657 struct nullb_zone *zone;
aa1c09cb 658 blk_status_t sts;
35bc10b2 659
fceb5d1b
CK		 660 switch (op) {
661 case REQ_OP_WRITE:
2b8b7ed7 662 return null_zone_write(cmd, sector, nr_sectors, false);
e0489ed5 663 case REQ_OP_ZONE_APPEND:
2b8b7ed7 664 return null_zone_write(cmd, sector, nr_sectors, true);
fceb5d1b
CK		 665 case REQ_OP_ZONE_RESET:
666 case REQ_OP_ZONE_RESET_ALL:
da644b2c
AJ		 667 case REQ_OP_ZONE_OPEN:
668 case REQ_OP_ZONE_CLOSE:
669 case REQ_OP_ZONE_FINISH:
2b8b7ed7 670 return null_zone_mgmt(cmd, op, sector);
fceb5d1b 671 default:
2b8b7ed7
DLM		 672 dev = cmd->nq->dev;
673 zone = &dev->zones[null_zone_no(dev, sector)];
674
675 null_lock_zone(dev, zone);
35bc10b2 676 sts = null_process_cmd(cmd, op, sector, nr_sectors);
2b8b7ed7
DLM		 677 null_unlock_zone(dev, zone);
678 return sts;
fceb5d1b 679 }
ca4b2a01 680}
Linux 6.x block layer and io_uring tree(s)