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0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/vmalloc.h>
0003 #include <linux/bitmap.h>
0004 #include "null_blk.h"
0005 
0006 #define CREATE_TRACE_POINTS
0007 #include "trace.h"
0008 
0009 #undef pr_fmt
0010 #define pr_fmt(fmt) "null_blk: " fmt
0011 
0012 static inline sector_t mb_to_sects(unsigned long mb)
0013 {
0014     return ((sector_t)mb * SZ_1M) >> SECTOR_SHIFT;
0015 }
0016 
0017 static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
0018 {
0019     return sect >> ilog2(dev->zone_size_sects);
0020 }
0021 
0022 static inline void null_lock_zone_res(struct nullb_device *dev)
0023 {
0024     if (dev->need_zone_res_mgmt)
0025         spin_lock_irq(&dev->zone_res_lock);
0026 }
0027 
0028 static inline void null_unlock_zone_res(struct nullb_device *dev)
0029 {
0030     if (dev->need_zone_res_mgmt)
0031         spin_unlock_irq(&dev->zone_res_lock);
0032 }
0033 
0034 static inline void null_init_zone_lock(struct nullb_device *dev,
0035                        struct nullb_zone *zone)
0036 {
0037     if (!dev->memory_backed)
0038         spin_lock_init(&zone->spinlock);
0039     else
0040         mutex_init(&zone->mutex);
0041 }
0042 
0043 static inline void null_lock_zone(struct nullb_device *dev,
0044                   struct nullb_zone *zone)
0045 {
0046     if (!dev->memory_backed)
0047         spin_lock_irq(&zone->spinlock);
0048     else
0049         mutex_lock(&zone->mutex);
0050 }
0051 
0052 static inline void null_unlock_zone(struct nullb_device *dev,
0053                     struct nullb_zone *zone)
0054 {
0055     if (!dev->memory_backed)
0056         spin_unlock_irq(&zone->spinlock);
0057     else
0058         mutex_unlock(&zone->mutex);
0059 }
0060 
0061 int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q)
0062 {
0063     sector_t dev_capacity_sects, zone_capacity_sects;
0064     struct nullb_zone *zone;
0065     sector_t sector = 0;
0066     unsigned int i;
0067 
0068     if (!is_power_of_2(dev->zone_size)) {
0069         pr_err("zone_size must be power-of-two\n");
0070         return -EINVAL;
0071     }
0072     if (dev->zone_size > dev->size) {
0073         pr_err("Zone size larger than device capacity\n");
0074         return -EINVAL;
0075     }
0076 
0077     if (!dev->zone_capacity)
0078         dev->zone_capacity = dev->zone_size;
0079 
0080     if (dev->zone_capacity > dev->zone_size) {
0081         pr_err("zone capacity (%lu MB) larger than zone size (%lu MB)\n",
0082                dev->zone_capacity, dev->zone_size);
0083         return -EINVAL;
0084     }
0085 
0086     zone_capacity_sects = mb_to_sects(dev->zone_capacity);
0087     dev_capacity_sects = mb_to_sects(dev->size);
0088     dev->zone_size_sects = mb_to_sects(dev->zone_size);
0089     dev->nr_zones = round_up(dev_capacity_sects, dev->zone_size_sects)
0090         >> ilog2(dev->zone_size_sects);
0091 
0092     dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct nullb_zone),
0093                     GFP_KERNEL | __GFP_ZERO);
0094     if (!dev->zones)
0095         return -ENOMEM;
0096 
0097     spin_lock_init(&dev->zone_res_lock);
0098 
0099     if (dev->zone_nr_conv >= dev->nr_zones) {
0100         dev->zone_nr_conv = dev->nr_zones - 1;
0101         pr_info("changed the number of conventional zones to %u",
0102             dev->zone_nr_conv);
0103     }
0104 
0105     /* Max active zones has to be < nbr of seq zones in order to be enforceable */
0106     if (dev->zone_max_active >= dev->nr_zones - dev->zone_nr_conv) {
0107         dev->zone_max_active = 0;
0108         pr_info("zone_max_active limit disabled, limit >= zone count\n");
0109     }
0110 
0111     /* Max open zones has to be <= max active zones */
0112     if (dev->zone_max_active && dev->zone_max_open > dev->zone_max_active) {
0113         dev->zone_max_open = dev->zone_max_active;
0114         pr_info("changed the maximum number of open zones to %u\n",
0115             dev->nr_zones);
0116     } else if (dev->zone_max_open >= dev->nr_zones - dev->zone_nr_conv) {
0117         dev->zone_max_open = 0;
0118         pr_info("zone_max_open limit disabled, limit >= zone count\n");
0119     }
0120     dev->need_zone_res_mgmt = dev->zone_max_active || dev->zone_max_open;
0121     dev->imp_close_zone_no = dev->zone_nr_conv;
0122 
0123     for (i = 0; i <  dev->zone_nr_conv; i++) {
0124         zone = &dev->zones[i];
0125 
0126         null_init_zone_lock(dev, zone);
0127         zone->start = sector;
0128         zone->len = dev->zone_size_sects;
0129         zone->capacity = zone->len;
0130         zone->wp = zone->start + zone->len;
0131         zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
0132         zone->cond = BLK_ZONE_COND_NOT_WP;
0133 
0134         sector += dev->zone_size_sects;
0135     }
0136 
0137     for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
0138         zone = &dev->zones[i];
0139 
0140         null_init_zone_lock(dev, zone);
0141         zone->start = zone->wp = sector;
0142         if (zone->start + dev->zone_size_sects > dev_capacity_sects)
0143             zone->len = dev_capacity_sects - zone->start;
0144         else
0145             zone->len = dev->zone_size_sects;
0146         zone->capacity =
0147             min_t(sector_t, zone->len, zone_capacity_sects);
0148         zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
0149         zone->cond = BLK_ZONE_COND_EMPTY;
0150 
0151         sector += dev->zone_size_sects;
0152     }
0153 
0154     return 0;
0155 }
0156 
0157 int null_register_zoned_dev(struct nullb *nullb)
0158 {
0159     struct nullb_device *dev = nullb->dev;
0160     struct request_queue *q = nullb->q;
0161 
0162     disk_set_zoned(nullb->disk, BLK_ZONED_HM);
0163     blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
0164     blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
0165 
0166     if (queue_is_mq(q)) {
0167         int ret = blk_revalidate_disk_zones(nullb->disk, NULL);
0168 
0169         if (ret)
0170             return ret;
0171     } else {
0172         blk_queue_chunk_sectors(q, dev->zone_size_sects);
0173         nullb->disk->nr_zones = bdev_nr_zones(nullb->disk->part0);
0174     }
0175 
0176     blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
0177     disk_set_max_open_zones(nullb->disk, dev->zone_max_open);
0178     disk_set_max_active_zones(nullb->disk, dev->zone_max_active);
0179 
0180     return 0;
0181 }
0182 
0183 void null_free_zoned_dev(struct nullb_device *dev)
0184 {
0185     kvfree(dev->zones);
0186     dev->zones = NULL;
0187 }
0188 
0189 int null_report_zones(struct gendisk *disk, sector_t sector,
0190         unsigned int nr_zones, report_zones_cb cb, void *data)
0191 {
0192     struct nullb *nullb = disk->private_data;
0193     struct nullb_device *dev = nullb->dev;
0194     unsigned int first_zone, i;
0195     struct nullb_zone *zone;
0196     struct blk_zone blkz;
0197     int error;
0198 
0199     first_zone = null_zone_no(dev, sector);
0200     if (first_zone >= dev->nr_zones)
0201         return 0;
0202 
0203     nr_zones = min(nr_zones, dev->nr_zones - first_zone);
0204     trace_nullb_report_zones(nullb, nr_zones);
0205 
0206     memset(&blkz, 0, sizeof(struct blk_zone));
0207     zone = &dev->zones[first_zone];
0208     for (i = 0; i < nr_zones; i++, zone++) {
0209         /*
0210          * Stacked DM target drivers will remap the zone information by
0211          * modifying the zone information passed to the report callback.
0212          * So use a local copy to avoid corruption of the device zone
0213          * array.
0214          */
0215         null_lock_zone(dev, zone);
0216         blkz.start = zone->start;
0217         blkz.len = zone->len;
0218         blkz.wp = zone->wp;
0219         blkz.type = zone->type;
0220         blkz.cond = zone->cond;
0221         blkz.capacity = zone->capacity;
0222         null_unlock_zone(dev, zone);
0223 
0224         error = cb(&blkz, i, data);
0225         if (error)
0226             return error;
0227     }
0228 
0229     return nr_zones;
0230 }
0231 
0232 /*
0233  * This is called in the case of memory backing from null_process_cmd()
0234  * with the target zone already locked.
0235  */
0236 size_t null_zone_valid_read_len(struct nullb *nullb,
0237                 sector_t sector, unsigned int len)
0238 {
0239     struct nullb_device *dev = nullb->dev;
0240     struct nullb_zone *zone = &dev->zones[null_zone_no(dev, sector)];
0241     unsigned int nr_sectors = len >> SECTOR_SHIFT;
0242 
0243     /* Read must be below the write pointer position */
0244     if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
0245         sector + nr_sectors <= zone->wp)
0246         return len;
0247 
0248     if (sector > zone->wp)
0249         return 0;
0250 
0251     return (zone->wp - sector) << SECTOR_SHIFT;
0252 }
0253 
0254 static blk_status_t __null_close_zone(struct nullb_device *dev,
0255                       struct nullb_zone *zone)
0256 {
0257     switch (zone->cond) {
0258     case BLK_ZONE_COND_CLOSED:
0259         /* close operation on closed is not an error */
0260         return BLK_STS_OK;
0261     case BLK_ZONE_COND_IMP_OPEN:
0262         dev->nr_zones_imp_open--;
0263         break;
0264     case BLK_ZONE_COND_EXP_OPEN:
0265         dev->nr_zones_exp_open--;
0266         break;
0267     case BLK_ZONE_COND_EMPTY:
0268     case BLK_ZONE_COND_FULL:
0269     default:
0270         return BLK_STS_IOERR;
0271     }
0272 
0273     if (zone->wp == zone->start) {
0274         zone->cond = BLK_ZONE_COND_EMPTY;
0275     } else {
0276         zone->cond = BLK_ZONE_COND_CLOSED;
0277         dev->nr_zones_closed++;
0278     }
0279 
0280     return BLK_STS_OK;
0281 }
0282 
0283 static void null_close_imp_open_zone(struct nullb_device *dev)
0284 {
0285     struct nullb_zone *zone;
0286     unsigned int zno, i;
0287 
0288     zno = dev->imp_close_zone_no;
0289     if (zno >= dev->nr_zones)
0290         zno = dev->zone_nr_conv;
0291 
0292     for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
0293         zone = &dev->zones[zno];
0294         zno++;
0295         if (zno >= dev->nr_zones)
0296             zno = dev->zone_nr_conv;
0297 
0298         if (zone->cond == BLK_ZONE_COND_IMP_OPEN) {
0299             __null_close_zone(dev, zone);
0300             dev->imp_close_zone_no = zno;
0301             return;
0302         }
0303     }
0304 }
0305 
0306 static blk_status_t null_check_active(struct nullb_device *dev)
0307 {
0308     if (!dev->zone_max_active)
0309         return BLK_STS_OK;
0310 
0311     if (dev->nr_zones_exp_open + dev->nr_zones_imp_open +
0312             dev->nr_zones_closed < dev->zone_max_active)
0313         return BLK_STS_OK;
0314 
0315     return BLK_STS_ZONE_ACTIVE_RESOURCE;
0316 }
0317 
0318 static blk_status_t null_check_open(struct nullb_device *dev)
0319 {
0320     if (!dev->zone_max_open)
0321         return BLK_STS_OK;
0322 
0323     if (dev->nr_zones_exp_open + dev->nr_zones_imp_open < dev->zone_max_open)
0324         return BLK_STS_OK;
0325 
0326     if (dev->nr_zones_imp_open) {
0327         if (null_check_active(dev) == BLK_STS_OK) {
0328             null_close_imp_open_zone(dev);
0329             return BLK_STS_OK;
0330         }
0331     }
0332 
0333     return BLK_STS_ZONE_OPEN_RESOURCE;
0334 }
0335 
0336 /*
0337  * This function matches the manage open zone resources function in the ZBC standard,
0338  * with the addition of max active zones support (added in the ZNS standard).
0339  *
0340  * The function determines if a zone can transition to implicit open or explicit open,
0341  * while maintaining the max open zone (and max active zone) limit(s). It may close an
0342  * implicit open zone in order to make additional zone resources available.
0343  *
0344  * ZBC states that an implicit open zone shall be closed only if there is not
0345  * room within the open limit. However, with the addition of an active limit,
0346  * it is not certain that closing an implicit open zone will allow a new zone
0347  * to be opened, since we might already be at the active limit capacity.
0348  */
0349 static blk_status_t null_check_zone_resources(struct nullb_device *dev,
0350                           struct nullb_zone *zone)
0351 {
0352     blk_status_t ret;
0353 
0354     switch (zone->cond) {
0355     case BLK_ZONE_COND_EMPTY:
0356         ret = null_check_active(dev);
0357         if (ret != BLK_STS_OK)
0358             return ret;
0359         fallthrough;
0360     case BLK_ZONE_COND_CLOSED:
0361         return null_check_open(dev);
0362     default:
0363         /* Should never be called for other states */
0364         WARN_ON(1);
0365         return BLK_STS_IOERR;
0366     }
0367 }
0368 
0369 static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
0370                     unsigned int nr_sectors, bool append)
0371 {
0372     struct nullb_device *dev = cmd->nq->dev;
0373     unsigned int zno = null_zone_no(dev, sector);
0374     struct nullb_zone *zone = &dev->zones[zno];
0375     blk_status_t ret;
0376 
0377     trace_nullb_zone_op(cmd, zno, zone->cond);
0378 
0379     if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) {
0380         if (append)
0381             return BLK_STS_IOERR;
0382         return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
0383     }
0384 
0385     null_lock_zone(dev, zone);
0386 
0387     if (zone->cond == BLK_ZONE_COND_FULL) {
0388         /* Cannot write to a full zone */
0389         ret = BLK_STS_IOERR;
0390         goto unlock;
0391     }
0392 
0393     /*
0394      * Regular writes must be at the write pointer position.
0395      * Zone append writes are automatically issued at the write
0396      * pointer and the position returned using the request or BIO
0397      * sector.
0398      */
0399     if (append) {
0400         sector = zone->wp;
0401         if (dev->queue_mode == NULL_Q_MQ)
0402             cmd->rq->__sector = sector;
0403         else
0404             cmd->bio->bi_iter.bi_sector = sector;
0405     } else if (sector != zone->wp) {
0406         ret = BLK_STS_IOERR;
0407         goto unlock;
0408     }
0409 
0410     if (zone->wp + nr_sectors > zone->start + zone->capacity) {
0411         ret = BLK_STS_IOERR;
0412         goto unlock;
0413     }
0414 
0415     if (zone->cond == BLK_ZONE_COND_CLOSED ||
0416         zone->cond == BLK_ZONE_COND_EMPTY) {
0417         null_lock_zone_res(dev);
0418 
0419         ret = null_check_zone_resources(dev, zone);
0420         if (ret != BLK_STS_OK) {
0421             null_unlock_zone_res(dev);
0422             goto unlock;
0423         }
0424         if (zone->cond == BLK_ZONE_COND_CLOSED) {
0425             dev->nr_zones_closed--;
0426             dev->nr_zones_imp_open++;
0427         } else if (zone->cond == BLK_ZONE_COND_EMPTY) {
0428             dev->nr_zones_imp_open++;
0429         }
0430 
0431         if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
0432             zone->cond = BLK_ZONE_COND_IMP_OPEN;
0433 
0434         null_unlock_zone_res(dev);
0435     }
0436 
0437     ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
0438     if (ret != BLK_STS_OK)
0439         goto unlock;
0440 
0441     zone->wp += nr_sectors;
0442     if (zone->wp == zone->start + zone->capacity) {
0443         null_lock_zone_res(dev);
0444         if (zone->cond == BLK_ZONE_COND_EXP_OPEN)
0445             dev->nr_zones_exp_open--;
0446         else if (zone->cond == BLK_ZONE_COND_IMP_OPEN)
0447             dev->nr_zones_imp_open--;
0448         zone->cond = BLK_ZONE_COND_FULL;
0449         null_unlock_zone_res(dev);
0450     }
0451 
0452     ret = BLK_STS_OK;
0453 
0454 unlock:
0455     null_unlock_zone(dev, zone);
0456 
0457     return ret;
0458 }
0459 
0460 static blk_status_t null_open_zone(struct nullb_device *dev,
0461                    struct nullb_zone *zone)
0462 {
0463     blk_status_t ret = BLK_STS_OK;
0464 
0465     if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
0466         return BLK_STS_IOERR;
0467 
0468     null_lock_zone_res(dev);
0469 
0470     switch (zone->cond) {
0471     case BLK_ZONE_COND_EXP_OPEN:
0472         /* open operation on exp open is not an error */
0473         goto unlock;
0474     case BLK_ZONE_COND_EMPTY:
0475         ret = null_check_zone_resources(dev, zone);
0476         if (ret != BLK_STS_OK)
0477             goto unlock;
0478         break;
0479     case BLK_ZONE_COND_IMP_OPEN:
0480         dev->nr_zones_imp_open--;
0481         break;
0482     case BLK_ZONE_COND_CLOSED:
0483         ret = null_check_zone_resources(dev, zone);
0484         if (ret != BLK_STS_OK)
0485             goto unlock;
0486         dev->nr_zones_closed--;
0487         break;
0488     case BLK_ZONE_COND_FULL:
0489     default:
0490         ret = BLK_STS_IOERR;
0491         goto unlock;
0492     }
0493 
0494     zone->cond = BLK_ZONE_COND_EXP_OPEN;
0495     dev->nr_zones_exp_open++;
0496 
0497 unlock:
0498     null_unlock_zone_res(dev);
0499 
0500     return ret;
0501 }
0502 
0503 static blk_status_t null_close_zone(struct nullb_device *dev,
0504                     struct nullb_zone *zone)
0505 {
0506     blk_status_t ret;
0507 
0508     if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
0509         return BLK_STS_IOERR;
0510 
0511     null_lock_zone_res(dev);
0512     ret = __null_close_zone(dev, zone);
0513     null_unlock_zone_res(dev);
0514 
0515     return ret;
0516 }
0517 
0518 static blk_status_t null_finish_zone(struct nullb_device *dev,
0519                      struct nullb_zone *zone)
0520 {
0521     blk_status_t ret = BLK_STS_OK;
0522 
0523     if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
0524         return BLK_STS_IOERR;
0525 
0526     null_lock_zone_res(dev);
0527 
0528     switch (zone->cond) {
0529     case BLK_ZONE_COND_FULL:
0530         /* finish operation on full is not an error */
0531         goto unlock;
0532     case BLK_ZONE_COND_EMPTY:
0533         ret = null_check_zone_resources(dev, zone);
0534         if (ret != BLK_STS_OK)
0535             goto unlock;
0536         break;
0537     case BLK_ZONE_COND_IMP_OPEN:
0538         dev->nr_zones_imp_open--;
0539         break;
0540     case BLK_ZONE_COND_EXP_OPEN:
0541         dev->nr_zones_exp_open--;
0542         break;
0543     case BLK_ZONE_COND_CLOSED:
0544         ret = null_check_zone_resources(dev, zone);
0545         if (ret != BLK_STS_OK)
0546             goto unlock;
0547         dev->nr_zones_closed--;
0548         break;
0549     default:
0550         ret = BLK_STS_IOERR;
0551         goto unlock;
0552     }
0553 
0554     zone->cond = BLK_ZONE_COND_FULL;
0555     zone->wp = zone->start + zone->len;
0556 
0557 unlock:
0558     null_unlock_zone_res(dev);
0559 
0560     return ret;
0561 }
0562 
0563 static blk_status_t null_reset_zone(struct nullb_device *dev,
0564                     struct nullb_zone *zone)
0565 {
0566     if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
0567         return BLK_STS_IOERR;
0568 
0569     null_lock_zone_res(dev);
0570 
0571     switch (zone->cond) {
0572     case BLK_ZONE_COND_EMPTY:
0573         /* reset operation on empty is not an error */
0574         null_unlock_zone_res(dev);
0575         return BLK_STS_OK;
0576     case BLK_ZONE_COND_IMP_OPEN:
0577         dev->nr_zones_imp_open--;
0578         break;
0579     case BLK_ZONE_COND_EXP_OPEN:
0580         dev->nr_zones_exp_open--;
0581         break;
0582     case BLK_ZONE_COND_CLOSED:
0583         dev->nr_zones_closed--;
0584         break;
0585     case BLK_ZONE_COND_FULL:
0586         break;
0587     default:
0588         null_unlock_zone_res(dev);
0589         return BLK_STS_IOERR;
0590     }
0591 
0592     zone->cond = BLK_ZONE_COND_EMPTY;
0593     zone->wp = zone->start;
0594 
0595     null_unlock_zone_res(dev);
0596 
0597     if (dev->memory_backed)
0598         return null_handle_discard(dev, zone->start, zone->len);
0599 
0600     return BLK_STS_OK;
0601 }
0602 
0603 static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_op op,
0604                    sector_t sector)
0605 {
0606     struct nullb_device *dev = cmd->nq->dev;
0607     unsigned int zone_no;
0608     struct nullb_zone *zone;
0609     blk_status_t ret;
0610     size_t i;
0611 
0612     if (op == REQ_OP_ZONE_RESET_ALL) {
0613         for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
0614             zone = &dev->zones[i];
0615             null_lock_zone(dev, zone);
0616             if (zone->cond != BLK_ZONE_COND_EMPTY) {
0617                 null_reset_zone(dev, zone);
0618                 trace_nullb_zone_op(cmd, i, zone->cond);
0619             }
0620             null_unlock_zone(dev, zone);
0621         }
0622         return BLK_STS_OK;
0623     }
0624 
0625     zone_no = null_zone_no(dev, sector);
0626     zone = &dev->zones[zone_no];
0627 
0628     null_lock_zone(dev, zone);
0629 
0630     switch (op) {
0631     case REQ_OP_ZONE_RESET:
0632         ret = null_reset_zone(dev, zone);
0633         break;
0634     case REQ_OP_ZONE_OPEN:
0635         ret = null_open_zone(dev, zone);
0636         break;
0637     case REQ_OP_ZONE_CLOSE:
0638         ret = null_close_zone(dev, zone);
0639         break;
0640     case REQ_OP_ZONE_FINISH:
0641         ret = null_finish_zone(dev, zone);
0642         break;
0643     default:
0644         ret = BLK_STS_NOTSUPP;
0645         break;
0646     }
0647 
0648     if (ret == BLK_STS_OK)
0649         trace_nullb_zone_op(cmd, zone_no, zone->cond);
0650 
0651     null_unlock_zone(dev, zone);
0652 
0653     return ret;
0654 }
0655 
0656 blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_op op,
0657                     sector_t sector, sector_t nr_sectors)
0658 {
0659     struct nullb_device *dev;
0660     struct nullb_zone *zone;
0661     blk_status_t sts;
0662 
0663     switch (op) {
0664     case REQ_OP_WRITE:
0665         return null_zone_write(cmd, sector, nr_sectors, false);
0666     case REQ_OP_ZONE_APPEND:
0667         return null_zone_write(cmd, sector, nr_sectors, true);
0668     case REQ_OP_ZONE_RESET:
0669     case REQ_OP_ZONE_RESET_ALL:
0670     case REQ_OP_ZONE_OPEN:
0671     case REQ_OP_ZONE_CLOSE:
0672     case REQ_OP_ZONE_FINISH:
0673         return null_zone_mgmt(cmd, op, sector);
0674     default:
0675         dev = cmd->nq->dev;
0676         zone = &dev->zones[null_zone_no(dev, sector)];
0677 
0678         null_lock_zone(dev, zone);
0679         sts = null_process_cmd(cmd, op, sector, nr_sectors);
0680         null_unlock_zone(dev, zone);
0681         return sts;
0682     }
0683 }
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