27 		pr_err("Zone size larger than device capacity\n");  in null_init_zoned_dev()
35 		pr_err("null_blk: zone capacity (%lu MB) larger than zone size (%lu MB)\n",  in null_init_zoned_dev()
54 	 * released to avoid scheduling in atomic context. To guarantee zone  in null_init_zoned_dev()
77 		pr_info("zone_max_active limit disabled, limit >= zone count\n");  in null_init_zoned_dev()
87 		pr_info("zone_max_open limit disabled, limit >= zone count\n");  in null_init_zoned_dev()
91 		struct blk_zone *zone = &dev->zones[i];  in null_init_zoned_dev()  local
93 		zone->start = sector;  in null_init_zoned_dev()
94 		zone->len = dev->zone_size_sects;  in null_init_zoned_dev()
95 		zone->capacity = zone->len;  in null_init_zoned_dev()
96 		zone->wp = zone->start + zone->len;  in null_init_zoned_dev()
97 		zone->type = BLK_ZONE_TYPE_CONVENTIONAL;  in null_init_zoned_dev()
98 		zone->cond = BLK_ZONE_COND_NOT_WP;  in null_init_zoned_dev()
104 		struct blk_zone *zone = &dev->zones[i];  in null_init_zoned_dev()  local
106 		zone->start = zone->wp = sector;  in null_init_zoned_dev()
107 		if (zone->start + dev->zone_size_sects > dev_capacity_sects)  in null_init_zoned_dev()
108 			zone->len = dev_capacity_sects - zone->start;  in null_init_zoned_dev()
110 			zone->len = dev->zone_size_sects;  in null_init_zoned_dev()
111 		zone->capacity =  in null_init_zoned_dev()
112 			min_t(sector_t, zone->len, zone_capacity_sects);  in null_init_zoned_dev()
113 		zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;  in null_init_zoned_dev()
114 		zone->cond = BLK_ZONE_COND_EMPTY;  in null_init_zoned_dev()
176 	struct blk_zone zone;  in null_report_zones()  local
189 		 * Stacked DM target drivers will remap the zone information by  in null_report_zones()
190 		 * modifying the zone information passed to the report callback.  in null_report_zones()
191 		 * So use a local copy to avoid corruption of the device zone  in null_report_zones()
195 		memcpy(&zone, &dev->zones[zno], sizeof(struct blk_zone));  in null_report_zones()
198 		error = cb(&zone, i, data);  in null_report_zones()
208  * with the target zone already locked.
214 	struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];  in null_zone_valid_read_len()  local
218 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||  in null_zone_valid_read_len()
219 	    sector + nr_sectors <= zone->wp)  in null_zone_valid_read_len()
222 	if (sector > zone->wp)  in null_zone_valid_read_len()
225 	return (zone->wp - sector) << SECTOR_SHIFT;  in null_zone_valid_read_len()
228 static blk_status_t null_close_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_close_zone()  argument
230 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_close_zone()
233 	switch (zone->cond) {  in null_close_zone()
249 	if (zone->wp == zone->start) {  in null_close_zone()
250 		zone->cond = BLK_ZONE_COND_EMPTY;  in null_close_zone()
252 		zone->cond = BLK_ZONE_COND_CLOSED;  in null_close_zone()
302  * This function matches the manage open zone resources function in the ZBC standard,
305  * The function determines if a zone can transition to implicit open or explicit open,
306  * while maintaining the max open zone (and max active zone) limit(s). It may close an
307  * implicit open zone in order to make additional zone resources available.
309  * ZBC states that an implicit open zone shall be closed only if there is not
311  * it is not certain that closing an implicit open zone will allow a new zone
314 static blk_status_t null_check_zone_resources(struct nullb_device *dev, struct blk_zone *zone)  in null_check_zone_resources()  argument
318 	switch (zone->cond) {  in null_check_zone_resources()
338 	struct blk_zone *zone = &dev->zones[zno];  in null_zone_write()  local
341 	trace_nullb_zone_op(cmd, zno, zone->cond);  in null_zone_write()
343 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) {  in null_zone_write()
351 	switch (zone->cond) {  in null_zone_write()
353 		/* Cannot write to a full zone */  in null_zone_write()
358 		ret = null_check_zone_resources(dev, zone);  in null_zone_write()
366 		/* Invalid zone condition */  in null_zone_write()
373 	 * Zone append writes are automatically issued at the write  in null_zone_write()
378 		sector = zone->wp;  in null_zone_write()
383 	} else if (sector != zone->wp) {  in null_zone_write()
388 	if (zone->wp + nr_sectors > zone->start + zone->capacity) {  in null_zone_write()
393 	if (zone->cond == BLK_ZONE_COND_CLOSED) {  in null_zone_write()
396 	} else if (zone->cond == BLK_ZONE_COND_EMPTY) {  in null_zone_write()
399 	if (zone->cond != BLK_ZONE_COND_EXP_OPEN)  in null_zone_write()
400 		zone->cond = BLK_ZONE_COND_IMP_OPEN;  in null_zone_write()
404 	 * to avoid scheduling in atomic context. Zone operation atomicity is  in null_zone_write()
416 	zone->wp += nr_sectors;  in null_zone_write()
417 	if (zone->wp == zone->start + zone->capacity) {  in null_zone_write()
418 		if (zone->cond == BLK_ZONE_COND_EXP_OPEN)  in null_zone_write()
420 		else if (zone->cond == BLK_ZONE_COND_IMP_OPEN)  in null_zone_write()
422 		zone->cond = BLK_ZONE_COND_FULL;  in null_zone_write()
432 static blk_status_t null_open_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_open_zone()  argument
436 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_open_zone()
439 	switch (zone->cond) {  in null_open_zone()
444 		ret = null_check_zone_resources(dev, zone);  in null_open_zone()
452 		ret = null_check_zone_resources(dev, zone);  in null_open_zone()
462 	zone->cond = BLK_ZONE_COND_EXP_OPEN;  in null_open_zone()
468 static blk_status_t null_finish_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_finish_zone()  argument
472 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_finish_zone()
475 	switch (zone->cond) {  in null_finish_zone()
480 		ret = null_check_zone_resources(dev, zone);  in null_finish_zone()
491 		ret = null_check_zone_resources(dev, zone);  in null_finish_zone()
500 	zone->cond = BLK_ZONE_COND_FULL;  in null_finish_zone()
501 	zone->wp = zone->start + zone->len;  in null_finish_zone()
506 static blk_status_t null_reset_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_reset_zone()  argument
508 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_reset_zone()
511 	switch (zone->cond) {  in null_reset_zone()
530 	zone->cond = BLK_ZONE_COND_EMPTY;  in null_reset_zone()
531 	zone->wp = zone->start;  in null_reset_zone()
541 	struct blk_zone *zone;  in null_zone_mgmt()  local
548 			zone = &dev->zones[i];  in null_zone_mgmt()
549 			if (zone->cond != BLK_ZONE_COND_EMPTY) {  in null_zone_mgmt()
550 				null_reset_zone(dev, zone);  in null_zone_mgmt()
551 				trace_nullb_zone_op(cmd, i, zone->cond);  in null_zone_mgmt()
559 	zone = &dev->zones[zone_no];  in null_zone_mgmt()
565 		ret = null_reset_zone(dev, zone);  in null_zone_mgmt()
568 		ret = null_open_zone(dev, zone);  in null_zone_mgmt()
571 		ret = null_close_zone(dev, zone);  in null_zone_mgmt()
574 		ret = null_finish_zone(dev, zone);  in null_zone_mgmt()
582 		trace_nullb_zone_op(cmd, zone_no, zone->cond);  in null_zone_mgmt()