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Merge tag 'erofs-for-6.8-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel...
[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
db060f54
DLM		 9#undef pr_fmt
10#define pr_fmt(fmt) "null_blk: " fmt
11
cd92cdb9
DLM		 12static inline sector_t mb_to_sects(unsigned long mb)
13{
14 return ((sector_t)mb * SZ_1M) >> SECTOR_SHIFT;
15}
ca4b2a01
MB		 16
17static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
18{
19 return sect >> ilog2(dev->zone_size_sects);
20}
21
2b8b7ed7
DLM		 22static inline void null_lock_zone_res(struct nullb_device *dev)
23{
24 if (dev->need_zone_res_mgmt)
25 spin_lock_irq(&dev->zone_res_lock);
26}
27
28static inline void null_unlock_zone_res(struct nullb_device *dev)
29{
30 if (dev->need_zone_res_mgmt)
31 spin_unlock_irq(&dev->zone_res_lock);
32}
33
34static inline void null_init_zone_lock(struct nullb_device *dev,
35 struct nullb_zone *zone)
36{
37 if (!dev->memory_backed)
38 spin_lock_init(&zone->spinlock);
39 else
40 mutex_init(&zone->mutex);
41}
42
43static inline void null_lock_zone(struct nullb_device *dev,
44 struct nullb_zone *zone)
45{
46 if (!dev->memory_backed)
47 spin_lock_irq(&zone->spinlock);
48 else
49 mutex_lock(&zone->mutex);
50}
51
52static inline void null_unlock_zone(struct nullb_device *dev,
53 struct nullb_zone *zone)
54{
55 if (!dev->memory_backed)
56 spin_unlock_irq(&zone->spinlock);
57 else
58 mutex_unlock(&zone->mutex);
59}
60
d205bde7 61int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q)
ca4b2a01 62{
0ebcdd70 63 sector_t dev_capacity_sects, zone_capacity_sects;
2b8b7ed7 64 struct nullb_zone *zone;
ca4b2a01
MB		 65 sector_t sector = 0;
66 unsigned int i;
67
68 if (!is_power_of_2(dev->zone_size)) {
9c7eddf1 69 pr_err("zone_size must be power-of-two\n");
ca4b2a01
MB		 70 return -EINVAL;
71 }
e2748325
CK		 72 if (dev->zone_size > dev->size) {
73 pr_err("Zone size larger than device capacity\n");
74 return -EINVAL;
75 }
ca4b2a01 76
089565fb
AR		 77 if (!dev->zone_capacity)
78 dev->zone_capacity = dev->zone_size;
79
80 if (dev->zone_capacity > dev->zone_size) {
db060f54
DLM		 81 pr_err("zone capacity (%lu MB) larger than zone size (%lu MB)\n",
82 dev->zone_capacity, dev->zone_size);
089565fb
AR		 83 return -EINVAL;
84 }
85
cd92cdb9
DLM		 86 zone_capacity_sects = mb_to_sects(dev->zone_capacity);
87 dev_capacity_sects = mb_to_sects(dev->size);
88 dev->zone_size_sects = mb_to_sects(dev->zone_size);
89 dev->nr_zones = round_up(dev_capacity_sects, dev->zone_size_sects)
90 >> ilog2(dev->zone_size_sects);
0ebcdd70 91
2b8b7ed7
DLM		 92 dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct nullb_zone),
93 GFP_KERNEL | __GFP_ZERO);
ca4b2a01
MB		 94 if (!dev->zones)
95 return -ENOMEM;
96
2b8b7ed7 97 spin_lock_init(&dev->zone_res_lock);
aa1c09cb 98
ea2c18e1
MS		 99 if (dev->zone_nr_conv >= dev->nr_zones) {
100 dev->zone_nr_conv = dev->nr_zones - 1;
9c7eddf1 101 pr_info("changed the number of conventional zones to %u",
ea2c18e1
MS		 102 dev->zone_nr_conv);
103 }
104
dc4d137e
NC		 105 /* Max active zones has to be < nbr of seq zones in order to be enforceable */
106 if (dev->zone_max_active >= dev->nr_zones - dev->zone_nr_conv) {
107 dev->zone_max_active = 0;
108 pr_info("zone_max_active limit disabled, limit >= zone count\n");
109 }
110
111 /* Max open zones has to be <= max active zones */
112 if (dev->zone_max_active && dev->zone_max_open > dev->zone_max_active) {
113 dev->zone_max_open = dev->zone_max_active;
114 pr_info("changed the maximum number of open zones to %u\n",
115 dev->nr_zones);
116 } else if (dev->zone_max_open >= dev->nr_zones - dev->zone_nr_conv) {
117 dev->zone_max_open = 0;
118 pr_info("zone_max_open limit disabled, limit >= zone count\n");
119 }
2b8b7ed7 120 dev->need_zone_res_mgmt = dev->zone_max_active || dev->zone_max_open;
2e8c6e0e 121 dev->imp_close_zone_no = dev->zone_nr_conv;
dc4d137e 122
ea2c18e1 123 for (i = 0; i < dev->zone_nr_conv; i++) {
2b8b7ed7 124 zone = &dev->zones[i];
ea2c18e1 125
2b8b7ed7 126 null_init_zone_lock(dev, zone);
ea2c18e1
MS		 127 zone->start = sector;
128 zone->len = dev->zone_size_sects;
82394db7 129 zone->capacity = zone->len;
ea2c18e1
MS		 130 zone->wp = zone->start + zone->len;
131 zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
132 zone->cond = BLK_ZONE_COND_NOT_WP;
133
134 sector += dev->zone_size_sects;
135 }
136
137 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
2b8b7ed7 138 zone = &dev->zones[i];
ca4b2a01 139
2b8b7ed7 140 null_init_zone_lock(dev, zone);
ca4b2a01 141 zone->start = zone->wp = sector;
0ebcdd70
DLM		 142 if (zone->start + dev->zone_size_sects > dev_capacity_sects)
143 zone->len = dev_capacity_sects - zone->start;
144 else
145 zone->len = dev->zone_size_sects;
146 zone->capacity =
147 min_t(sector_t, zone->len, zone_capacity_sects);
ca4b2a01
MB		 148 zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
149 zone->cond = BLK_ZONE_COND_EMPTY;
150
151 sector += dev->zone_size_sects;
152 }
153
d205bde7
DLM		 154 return 0;
155}
156
157int null_register_zoned_dev(struct nullb *nullb)
158{
e0489ed5 159 struct nullb_device *dev = nullb->dev;
d205bde7
DLM		 160 struct request_queue *q = nullb->q;
161
d73e93b4 162 disk_set_zoned(nullb->disk);
5752dc78
DLM		 163 blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
164 blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
a442b899
DLM		 165 blk_queue_chunk_sectors(q, dev->zone_size_sects);
166 nullb->disk->nr_zones = bdev_nr_zones(nullb->disk->part0);
e0489ed5 167 blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
982977df
CH		 168 disk_set_max_open_zones(nullb->disk, dev->zone_max_open);
169 disk_set_max_active_zones(nullb->disk, dev->zone_max_active);
d205bde7 170
a442b899
DLM		 171 if (queue_is_mq(q))
172 return blk_revalidate_disk_zones(nullb->disk, NULL);
173
ca4b2a01
MB		 174 return 0;
175}
176
d205bde7 177void null_free_zoned_dev(struct nullb_device *dev)
ca4b2a01
MB		 178{
179 kvfree(dev->zones);
72ce11dd 180 dev->zones = NULL;
ca4b2a01
MB		 181}
182
7fc8fb51 183int null_report_zones(struct gendisk *disk, sector_t sector,
d4100351 184 unsigned int nr_zones, report_zones_cb cb, void *data)
ca4b2a01 185{
e76239a3
CH		 186 struct nullb *nullb = disk->private_data;
187 struct nullb_device *dev = nullb->dev;
2b8b7ed7
DLM		 188 unsigned int first_zone, i;
189 struct nullb_zone *zone;
190 struct blk_zone blkz;
d4100351 191 int error;
ca4b2a01 192
d4100351
CH		 193 first_zone = null_zone_no(dev, sector);
194 if (first_zone >= dev->nr_zones)
195 return 0;
ca4b2a01 196
d4100351 197 nr_zones = min(nr_zones, dev->nr_zones - first_zone);
766c3297
CK		 198 trace_nullb_report_zones(nullb, nr_zones);
199
2b8b7ed7
DLM		 200 memset(&blkz, 0, sizeof(struct blk_zone));
201 zone = &dev->zones[first_zone];
202 for (i = 0; i < nr_zones; i++, zone++) {
d4100351
CH		 203 /*
204 * Stacked DM target drivers will remap the zone information by
205 * modifying the zone information passed to the report callback.
206 * So use a local copy to avoid corruption of the device zone
207 * array.
208 */
2b8b7ed7
DLM		 209 null_lock_zone(dev, zone);
210 blkz.start = zone->start;
211 blkz.len = zone->len;
212 blkz.wp = zone->wp;
213 blkz.type = zone->type;
214 blkz.cond = zone->cond;
215 blkz.capacity = zone->capacity;
216 null_unlock_zone(dev, zone);
217
218 error = cb(&blkz, i, data);
d4100351
CH		 219 if (error)
220 return error;
221 }
ca4b2a01 222
d4100351 223 return nr_zones;
ca4b2a01
MB		 224}
225
aa1c09cb
DLM		 226/*
227 * This is called in the case of memory backing from null_process_cmd()
228 * with the target zone already locked.
229 */
dd85b492
AJ		 230size_t null_zone_valid_read_len(struct nullb *nullb,
231 sector_t sector, unsigned int len)
232{
233 struct nullb_device *dev = nullb->dev;
2b8b7ed7 234 struct nullb_zone *zone = &dev->zones[null_zone_no(dev, sector)];
dd85b492
AJ		 235 unsigned int nr_sectors = len >> SECTOR_SHIFT;
236
237 /* Read must be below the write pointer position */
238 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
239 sector + nr_sectors <= zone->wp)
240 return len;
241
242 if (sector > zone->wp)
243 return 0;
244
245 return (zone->wp - sector) << SECTOR_SHIFT;
246}
247
2b8b7ed7
DLM		 248static blk_status_t __null_close_zone(struct nullb_device *dev,
249 struct nullb_zone *zone)
dc4d137e 250{
dc4d137e
NC		 251 switch (zone->cond) {
252 case BLK_ZONE_COND_CLOSED:
253 /* close operation on closed is not an error */
254 return BLK_STS_OK;
255 case BLK_ZONE_COND_IMP_OPEN:
256 dev->nr_zones_imp_open--;
257 break;
258 case BLK_ZONE_COND_EXP_OPEN:
259 dev->nr_zones_exp_open--;
260 break;
261 case BLK_ZONE_COND_EMPTY:
262 case BLK_ZONE_COND_FULL:
263 default:
264 return BLK_STS_IOERR;
265 }
266
267 if (zone->wp == zone->start) {
268 zone->cond = BLK_ZONE_COND_EMPTY;
269 } else {
270 zone->cond = BLK_ZONE_COND_CLOSED;
271 dev->nr_zones_closed++;
272 }
273
274 return BLK_STS_OK;
275}
276
2e8c6e0e 277static void null_close_imp_open_zone(struct nullb_device *dev)
dc4d137e 278{
2e8c6e0e
DLM		 279 struct nullb_zone *zone;
280 unsigned int zno, i;
281
282 zno = dev->imp_close_zone_no;
283 if (zno >= dev->nr_zones)
284 zno = dev->zone_nr_conv;
dc4d137e
NC		 285
286 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
2e8c6e0e
DLM		 287 zone = &dev->zones[zno];
288 zno++;
289 if (zno >= dev->nr_zones)
290 zno = dev->zone_nr_conv;
291
292 if (zone->cond == BLK_ZONE_COND_IMP_OPEN) {
293 __null_close_zone(dev, zone);
294 dev->imp_close_zone_no = zno;
dc4d137e
NC		 295 return;
296 }
297 }
298}
299
fd78874b 300static blk_status_t null_check_active(struct nullb_device *dev)
dc4d137e
NC		 301{
302 if (!dev->zone_max_active)
fd78874b
KB		 303 return BLK_STS_OK;
304
305 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open +
306 dev->nr_zones_closed < dev->zone_max_active)
307 return BLK_STS_OK;
dc4d137e 308
fd78874b 309 return BLK_STS_ZONE_ACTIVE_RESOURCE;
dc4d137e
NC		 310}
311
fd78874b 312static blk_status_t null_check_open(struct nullb_device *dev)
dc4d137e
NC		 313{
314 if (!dev->zone_max_open)
fd78874b 315 return BLK_STS_OK;
dc4d137e
NC		 316
317 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open < dev->zone_max_open)
fd78874b 318 return BLK_STS_OK;
dc4d137e 319
fd78874b
KB		 320 if (dev->nr_zones_imp_open) {
321 if (null_check_active(dev) == BLK_STS_OK) {
2e8c6e0e 322 null_close_imp_open_zone(dev);
fd78874b
KB		 323 return BLK_STS_OK;
324 }
dc4d137e
NC		 325 }
326
fd78874b 327 return BLK_STS_ZONE_OPEN_RESOURCE;
dc4d137e
NC		 328}
329
330/*
331 * This function matches the manage open zone resources function in the ZBC standard,
332 * with the addition of max active zones support (added in the ZNS standard).
333 *
334 * The function determines if a zone can transition to implicit open or explicit open,
335 * while maintaining the max open zone (and max active zone) limit(s). It may close an
336 * implicit open zone in order to make additional zone resources available.
337 *
338 * ZBC states that an implicit open zone shall be closed only if there is not
339 * room within the open limit. However, with the addition of an active limit,
340 * it is not certain that closing an implicit open zone will allow a new zone
341 * to be opened, since we might already be at the active limit capacity.
342 */
2b8b7ed7
DLM		 343static blk_status_t null_check_zone_resources(struct nullb_device *dev,
344 struct nullb_zone *zone)
dc4d137e 345{
fd78874b
KB		 346 blk_status_t ret;
347
dc4d137e
NC		 348 switch (zone->cond) {
349 case BLK_ZONE_COND_EMPTY:
fd78874b
KB		 350 ret = null_check_active(dev);
351 if (ret != BLK_STS_OK)
352 return ret;
dc4d137e
NC		 353 fallthrough;
354 case BLK_ZONE_COND_CLOSED:
fd78874b 355 return null_check_open(dev);
dc4d137e
NC		 356 default:
357 /* Should never be called for other states */
358 WARN_ON(1);
fd78874b 359 return BLK_STS_IOERR;
dc4d137e
NC		 360 }
361}
362
fceb5d1b 363static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
e0489ed5 364 unsigned int nr_sectors, bool append)
ca4b2a01
MB		 365{
366 struct nullb_device *dev = cmd->nq->dev;
ca4b2a01 367 unsigned int zno = null_zone_no(dev, sector);
2b8b7ed7 368 struct nullb_zone *zone = &dev->zones[zno];
9dd44c7e
DLM		 369 blk_status_t ret;
370
371 trace_nullb_zone_op(cmd, zno, zone->cond);
372
2e896d89
DLM		 373 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) {
374 if (append)
375 return BLK_STS_IOERR;
9dd44c7e 376 return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
2e896d89 377 }
ca4b2a01 378
2b8b7ed7 379 null_lock_zone(dev, zone);
aa1c09cb 380
d3a57388
SK		 381 if (zone->cond == BLK_ZONE_COND_FULL ||
382 zone->cond == BLK_ZONE_COND_READONLY ||
383 zone->cond == BLK_ZONE_COND_OFFLINE) {
384 /* Cannot write to the zone */
aa1c09cb
DLM		 385 ret = BLK_STS_IOERR;
386 goto unlock;
dc4d137e
NC		 387 }
388
389 /*
390 * Regular writes must be at the write pointer position.
391 * Zone append writes are automatically issued at the write
392 * pointer and the position returned using the request or BIO
393 * sector.
394 */
395 if (append) {
396 sector = zone->wp;
aacae8c4 397 if (dev->queue_mode == NULL_Q_MQ)
dc4d137e 398 cmd->rq->__sector = sector;
aacae8c4
DLM		 399 else
400 cmd->bio->bi_iter.bi_sector = sector;
dc4d137e 401 } else if (sector != zone->wp) {
aa1c09cb
DLM		 402 ret = BLK_STS_IOERR;
403 goto unlock;
dc4d137e
NC		 404 }
405
aa1c09cb
DLM		 406 if (zone->wp + nr_sectors > zone->start + zone->capacity) {
407 ret = BLK_STS_IOERR;
408 goto unlock;
409 }
dc4d137e 410
2b8b7ed7
DLM		 411 if (zone->cond == BLK_ZONE_COND_CLOSED ||
412 zone->cond == BLK_ZONE_COND_EMPTY) {
413 null_lock_zone_res(dev);
414
415 ret = null_check_zone_resources(dev, zone);
416 if (ret != BLK_STS_OK) {
417 null_unlock_zone_res(dev);
418 goto unlock;
419 }
420 if (zone->cond == BLK_ZONE_COND_CLOSED) {
421 dev->nr_zones_closed--;
422 dev->nr_zones_imp_open++;
423 } else if (zone->cond == BLK_ZONE_COND_EMPTY) {
424 dev->nr_zones_imp_open++;
425 }
426
427 if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
428 zone->cond = BLK_ZONE_COND_IMP_OPEN;
429
430 null_unlock_zone_res(dev);
dc4d137e 431 }
dc4d137e
NC		 432
433 ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
434 if (ret != BLK_STS_OK)
aa1c09cb 435 goto unlock;
dc4d137e
NC		 436
437 zone->wp += nr_sectors;
438 if (zone->wp == zone->start + zone->capacity) {
2b8b7ed7 439 null_lock_zone_res(dev);
dc4d137e
NC		 440 if (zone->cond == BLK_ZONE_COND_EXP_OPEN)
441 dev->nr_zones_exp_open--;
442 else if (zone->cond == BLK_ZONE_COND_IMP_OPEN)
443 dev->nr_zones_imp_open--;
444 zone->cond = BLK_ZONE_COND_FULL;
2b8b7ed7 445 null_unlock_zone_res(dev);
dc4d137e 446 }
2b8b7ed7 447
aa1c09cb
DLM		 448 ret = BLK_STS_OK;
449
450unlock:
2b8b7ed7 451 null_unlock_zone(dev, zone);
aa1c09cb
DLM		 452
453 return ret;
dc4d137e
NC		 454}
455
2b8b7ed7
DLM		 456static blk_status_t null_open_zone(struct nullb_device *dev,
457 struct nullb_zone *zone)
dc4d137e 458{
2b8b7ed7 459 blk_status_t ret = BLK_STS_OK;
fd78874b 460
dc4d137e
NC		 461 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
462 return BLK_STS_IOERR;
463
2b8b7ed7
DLM		 464 null_lock_zone_res(dev);
465
dc4d137e
NC		 466 switch (zone->cond) {
467 case BLK_ZONE_COND_EXP_OPEN:
468 /* open operation on exp open is not an error */
2b8b7ed7 469 goto unlock;
dc4d137e 470 case BLK_ZONE_COND_EMPTY:
fd78874b
KB		 471 ret = null_check_zone_resources(dev, zone);
472 if (ret != BLK_STS_OK)
2b8b7ed7 473 goto unlock;
dc4d137e
NC		 474 break;
475 case BLK_ZONE_COND_IMP_OPEN:
476 dev->nr_zones_imp_open--;
477 break;
16c731fe 478 case BLK_ZONE_COND_CLOSED:
fd78874b
KB		 479 ret = null_check_zone_resources(dev, zone);
480 if (ret != BLK_STS_OK)
2b8b7ed7 481 goto unlock;
dc4d137e
NC		 482 dev->nr_zones_closed--;
483 break;
484 case BLK_ZONE_COND_FULL:
485 default:
2b8b7ed7
DLM		 486 ret = BLK_STS_IOERR;
487 goto unlock;
dc4d137e
NC		 488 }
489
490 zone->cond = BLK_ZONE_COND_EXP_OPEN;
491 dev->nr_zones_exp_open++;
ca4b2a01 492
2b8b7ed7
DLM		 493unlock:
494 null_unlock_zone_res(dev);
495
496 return ret;
dc4d137e
NC		 497}
498
2b8b7ed7
DLM		 499static blk_status_t null_close_zone(struct nullb_device *dev,
500 struct nullb_zone *zone)
dc4d137e 501{
fd78874b
KB		 502 blk_status_t ret;
503
dc4d137e
NC		 504 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
505 return BLK_STS_IOERR;
506
2b8b7ed7
DLM		 507 null_lock_zone_res(dev);
508 ret = __null_close_zone(dev, zone);
509 null_unlock_zone_res(dev);
510
511 return ret;
512}
513
514static blk_status_t null_finish_zone(struct nullb_device *dev,
515 struct nullb_zone *zone)
516{
517 blk_status_t ret = BLK_STS_OK;
518
519 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
520 return BLK_STS_IOERR;
521
522 null_lock_zone_res(dev);
523
dc4d137e
NC		 524 switch (zone->cond) {
525 case BLK_ZONE_COND_FULL:
526 /* finish operation on full is not an error */
2b8b7ed7 527 goto unlock;
dc4d137e 528 case BLK_ZONE_COND_EMPTY:
fd78874b
KB		 529 ret = null_check_zone_resources(dev, zone);
530 if (ret != BLK_STS_OK)
2b8b7ed7 531 goto unlock;
dc4d137e
NC		 532 break;
533 case BLK_ZONE_COND_IMP_OPEN:
534 dev->nr_zones_imp_open--;
535 break;
536 case BLK_ZONE_COND_EXP_OPEN:
537 dev->nr_zones_exp_open--;
538 break;
539 case BLK_ZONE_COND_CLOSED:
fd78874b
KB		 540 ret = null_check_zone_resources(dev, zone);
541 if (ret != BLK_STS_OK)
2b8b7ed7 542 goto unlock;
dc4d137e
NC		 543 dev->nr_zones_closed--;
544 break;
545 default:
2b8b7ed7
DLM		 546 ret = BLK_STS_IOERR;
547 goto unlock;
dc4d137e 548 }
089565fb 549
dc4d137e
NC		 550 zone->cond = BLK_ZONE_COND_FULL;
551 zone->wp = zone->start + zone->len;
ca4b2a01 552
2b8b7ed7
DLM		 553unlock:
554 null_unlock_zone_res(dev);
555
556 return ret;
dc4d137e
NC		 557}
558
2b8b7ed7
DLM		 559static blk_status_t null_reset_zone(struct nullb_device *dev,
560 struct nullb_zone *zone)
dc4d137e
NC		 561{
562 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
563 return BLK_STS_IOERR;
9dd44c7e 564
2b8b7ed7
DLM		 565 null_lock_zone_res(dev);
566
dc4d137e
NC		 567 switch (zone->cond) {
568 case BLK_ZONE_COND_EMPTY:
569 /* reset operation on empty is not an error */
2b8b7ed7 570 null_unlock_zone_res(dev);
9dd44c7e 571 return BLK_STS_OK;
dc4d137e
NC		 572 case BLK_ZONE_COND_IMP_OPEN:
573 dev->nr_zones_imp_open--;
574 break;
575 case BLK_ZONE_COND_EXP_OPEN:
576 dev->nr_zones_exp_open--;
577 break;
578 case BLK_ZONE_COND_CLOSED:
579 dev->nr_zones_closed--;
580 break;
581 case BLK_ZONE_COND_FULL:
582 break;
ca4b2a01 583 default:
2b8b7ed7 584 null_unlock_zone_res(dev);
fceb5d1b 585 return BLK_STS_IOERR;
ca4b2a01 586 }
dc4d137e
NC		 587
588 zone->cond = BLK_ZONE_COND_EMPTY;
589 zone->wp = zone->start;
590
2b8b7ed7
DLM		 591 null_unlock_zone_res(dev);
592
0ec4d913
DLM		 593 if (dev->memory_backed)
594 return null_handle_discard(dev, zone->start, zone->len);
595
dc4d137e 596 return BLK_STS_OK;
ca4b2a01
MB		 597}
598
ff07a02e 599static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_op op,
da644b2c 600 sector_t sector)
ca4b2a01
MB		 601{
602 struct nullb_device *dev = cmd->nq->dev;
aa1c09cb 603 unsigned int zone_no;
2b8b7ed7 604 struct nullb_zone *zone;
aa1c09cb 605 blk_status_t ret;
a61dbfb1
CK		 606 size_t i;
607
aa1c09cb 608 if (op == REQ_OP_ZONE_RESET_ALL) {
f9c91042
DLM		 609 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
610 zone = &dev->zones[i];
2b8b7ed7 611 null_lock_zone(dev, zone);
d3a57388
SK		 612 if (zone->cond != BLK_ZONE_COND_EMPTY &&
613 zone->cond != BLK_ZONE_COND_READONLY &&
614 zone->cond != BLK_ZONE_COND_OFFLINE) {
f9c91042
DLM		 615 null_reset_zone(dev, zone);
616 trace_nullb_zone_op(cmd, i, zone->cond);
617 }
2b8b7ed7 618 null_unlock_zone(dev, zone);
f9c91042
DLM		 619 }
620 return BLK_STS_OK;
aa1c09cb
DLM		 621 }
622
623 zone_no = null_zone_no(dev, sector);
624 zone = &dev->zones[zone_no];
625
2b8b7ed7 626 null_lock_zone(dev, zone);
aa1c09cb 627
d3a57388
SK		 628 if (zone->cond == BLK_ZONE_COND_READONLY ||
629 zone->cond == BLK_ZONE_COND_OFFLINE) {
630 ret = BLK_STS_IOERR;
631 goto unlock;
632 }
633
aa1c09cb 634 switch (op) {
a61dbfb1 635 case REQ_OP_ZONE_RESET:
dc4d137e 636 ret = null_reset_zone(dev, zone);
a61dbfb1 637 break;
da644b2c 638 case REQ_OP_ZONE_OPEN:
dc4d137e 639 ret = null_open_zone(dev, zone);
da644b2c
AJ		 640 break;
641 case REQ_OP_ZONE_CLOSE:
dc4d137e 642 ret = null_close_zone(dev, zone);
da644b2c
AJ		 643 break;
644 case REQ_OP_ZONE_FINISH:
dc4d137e 645 ret = null_finish_zone(dev, zone);
da644b2c 646 break;
a61dbfb1 647 default:
aa1c09cb
DLM		 648 ret = BLK_STS_NOTSUPP;
649 break;
ea2c18e1 650 }
766c3297 651
dc4d137e
NC		 652 if (ret == BLK_STS_OK)
653 trace_nullb_zone_op(cmd, zone_no, zone->cond);
654
d3a57388 655unlock:
2b8b7ed7 656 null_unlock_zone(dev, zone);
aa1c09cb 657
dc4d137e 658 return ret;
fceb5d1b
CK		 659}
660
ff07a02e 661blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_op op,
9dd44c7e 662 sector_t sector, sector_t nr_sectors)
fceb5d1b 663{
2b8b7ed7
DLM		 664 struct nullb_device *dev;
665 struct nullb_zone *zone;
aa1c09cb 666 blk_status_t sts;
35bc10b2 667
fceb5d1b
CK		 668 switch (op) {
669 case REQ_OP_WRITE:
2b8b7ed7 670 return null_zone_write(cmd, sector, nr_sectors, false);
e0489ed5 671 case REQ_OP_ZONE_APPEND:
2b8b7ed7 672 return null_zone_write(cmd, sector, nr_sectors, true);
fceb5d1b
CK		 673 case REQ_OP_ZONE_RESET:
674 case REQ_OP_ZONE_RESET_ALL:
da644b2c
AJ		 675 case REQ_OP_ZONE_OPEN:
676 case REQ_OP_ZONE_CLOSE:
677 case REQ_OP_ZONE_FINISH:
2b8b7ed7 678 return null_zone_mgmt(cmd, op, sector);
fceb5d1b 679 default:
2b8b7ed7
DLM		 680 dev = cmd->nq->dev;
681 zone = &dev->zones[null_zone_no(dev, sector)];
d3a57388
SK		 682 if (zone->cond == BLK_ZONE_COND_OFFLINE)
683 return BLK_STS_IOERR;
2b8b7ed7
DLM		 684
685 null_lock_zone(dev, zone);
35bc10b2 686 sts = null_process_cmd(cmd, op, sector, nr_sectors);
2b8b7ed7
DLM		 687 null_unlock_zone(dev, zone);
688 return sts;
fceb5d1b 689 }
ca4b2a01 690}
d3a57388
SK		 691
692/*
693 * Set a zone in the read-only or offline condition.
694 */
695static void null_set_zone_cond(struct nullb_device *dev,
696 struct nullb_zone *zone, enum blk_zone_cond cond)
697{
698 if (WARN_ON_ONCE(cond != BLK_ZONE_COND_READONLY &&
699 cond != BLK_ZONE_COND_OFFLINE))
700 return;
701
702 null_lock_zone(dev, zone);
703
704 /*
705 * If the read-only condition is requested again to zones already in
706 * read-only condition, restore back normal empty condition. Do the same
707 * if the offline condition is requested for offline zones. Otherwise,
708 * set the specified zone condition to the zones. Finish the zones
709 * beforehand to free up zone resources.
710 */
711 if (zone->cond == cond) {
712 zone->cond = BLK_ZONE_COND_EMPTY;
713 zone->wp = zone->start;
714 if (dev->memory_backed)
715 null_handle_discard(dev, zone->start, zone->len);
716 } else {
717 if (zone->cond != BLK_ZONE_COND_READONLY &&
718 zone->cond != BLK_ZONE_COND_OFFLINE)
719 null_finish_zone(dev, zone);
720 zone->cond = cond;
721 zone->wp = (sector_t)-1;
722 }
723
724 null_unlock_zone(dev, zone);
725}
726
727/*
728 * Identify a zone from the sector written to configfs file. Then set zone
729 * condition to the zone.
730 */
731ssize_t zone_cond_store(struct nullb_device *dev, const char *page,
732 size_t count, enum blk_zone_cond cond)
733{
734 unsigned long long sector;
735 unsigned int zone_no;
736 int ret;
737
738 if (!dev->zoned) {
739 pr_err("null_blk device is not zoned\n");
740 return -EINVAL;
741 }
742
743 if (!dev->zones) {
744 pr_err("null_blk device is not yet powered\n");
745 return -EINVAL;
746 }
747
748 ret = kstrtoull(page, 0, &sector);
749 if (ret < 0)
750 return ret;
751
752 zone_no = null_zone_no(dev, sector);
753 if (zone_no >= dev->nr_zones) {
754 pr_err("Sector out of range\n");
755 return -EINVAL;
756 }
757
758 if (dev->zones[zone_no].type == BLK_ZONE_TYPE_CONVENTIONAL) {
759 pr_err("Can not change condition of conventional zones\n");
760 return -EINVAL;
761 }
762
763 null_set_zone_cond(dev, &dev->zones[zone_no], cond);
764
765 return count;
766}
Linux 6.x block layer and io_uring tree(s)