28 		pr_err("Zone size larger than device capacity\n");  in null_init_zoned_dev()
36 		pr_err("null_blk: zone capacity (%lu MB) larger than zone size (%lu MB)\n",  in null_init_zoned_dev()
51 	 * released to avoid scheduling in atomic context. To guarantee zone  in null_init_zoned_dev()
74 		pr_info("zone_max_active limit disabled, limit >= zone count\n");  in null_init_zoned_dev()
84 		pr_info("zone_max_open limit disabled, limit >= zone count\n");  in null_init_zoned_dev()
88 		struct blk_zone *zone = &dev->zones[i];  in null_init_zoned_dev()  local
90 		zone->start = sector;  in null_init_zoned_dev()
91 		zone->len = dev->zone_size_sects;  in null_init_zoned_dev()
92 		zone->capacity = zone->len;  in null_init_zoned_dev()
93 		zone->wp = zone->start + zone->len;  in null_init_zoned_dev()
94 		zone->type = BLK_ZONE_TYPE_CONVENTIONAL;  in null_init_zoned_dev()
95 		zone->cond = BLK_ZONE_COND_NOT_WP;  in null_init_zoned_dev()
101 		struct blk_zone *zone = &dev->zones[i];  in null_init_zoned_dev()  local
103 		zone->start = zone->wp = sector;  in null_init_zoned_dev()
104 		zone->len = dev->zone_size_sects;  in null_init_zoned_dev()
105 		zone->capacity = dev->zone_capacity << ZONE_SIZE_SHIFT;  in null_init_zoned_dev()
106 		zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;  in null_init_zoned_dev()
107 		zone->cond = BLK_ZONE_COND_EMPTY;  in null_init_zoned_dev()
168 	struct blk_zone zone;  in null_report_zones()  local
181 		 * Stacked DM target drivers will remap the zone information by  in null_report_zones()
182 		 * modifying the zone information passed to the report callback.  in null_report_zones()
183 		 * So use a local copy to avoid corruption of the device zone  in null_report_zones()
187 		memcpy(&zone, &dev->zones[zno], sizeof(struct blk_zone));  in null_report_zones()
190 		error = cb(&zone, i, data);  in null_report_zones()
200  * with the target zone already locked.
206 	struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];  in null_zone_valid_read_len()  local
210 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||  in null_zone_valid_read_len()
211 	    sector + nr_sectors <= zone->wp)  in null_zone_valid_read_len()
214 	if (sector > zone->wp)  in null_zone_valid_read_len()
217 	return (zone->wp - sector) << SECTOR_SHIFT;  in null_zone_valid_read_len()
220 static blk_status_t null_close_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_close_zone()  argument
222 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_close_zone()
225 	switch (zone->cond) {  in null_close_zone()
241 	if (zone->wp == zone->start) {  in null_close_zone()
242 		zone->cond = BLK_ZONE_COND_EMPTY;  in null_close_zone()
244 		zone->cond = BLK_ZONE_COND_CLOSED;  in null_close_zone()
294  * This function matches the manage open zone resources function in the ZBC standard,
297  * The function determines if a zone can transition to implicit open or explicit open,
298  * while maintaining the max open zone (and max active zone) limit(s). It may close an
299  * implicit open zone in order to make additional zone resources available.
301  * ZBC states that an implicit open zone shall be closed only if there is not
303  * it is not certain that closing an implicit open zone will allow a new zone
306 static blk_status_t null_check_zone_resources(struct nullb_device *dev, struct blk_zone *zone)  in null_check_zone_resources()  argument
310 	switch (zone->cond) {  in null_check_zone_resources()
330 	struct blk_zone *zone = &dev->zones[zno];  in null_zone_write()  local
333 	trace_nullb_zone_op(cmd, zno, zone->cond);  in null_zone_write()
335 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_zone_write()
340 	switch (zone->cond) {  in null_zone_write()
342 		/* Cannot write to a full zone */  in null_zone_write()
347 		ret = null_check_zone_resources(dev, zone);  in null_zone_write()
355 		/* Invalid zone condition */  in null_zone_write()
362 	 * Zone append writes are automatically issued at the write  in null_zone_write()
367 		sector = zone->wp;  in null_zone_write()
372 	} else if (sector != zone->wp) {  in null_zone_write()
377 	if (zone->wp + nr_sectors > zone->start + zone->capacity) {  in null_zone_write()
382 	if (zone->cond == BLK_ZONE_COND_CLOSED) {  in null_zone_write()
385 	} else if (zone->cond == BLK_ZONE_COND_EMPTY) {  in null_zone_write()
388 	if (zone->cond != BLK_ZONE_COND_EXP_OPEN)  in null_zone_write()
389 		zone->cond = BLK_ZONE_COND_IMP_OPEN;  in null_zone_write()
393 	 * to avoid scheduling in atomic context. Zone operation atomicity is  in null_zone_write()
405 	zone->wp += nr_sectors;  in null_zone_write()
406 	if (zone->wp == zone->start + zone->capacity) {  in null_zone_write()
407 		if (zone->cond == BLK_ZONE_COND_EXP_OPEN)  in null_zone_write()
409 		else if (zone->cond == BLK_ZONE_COND_IMP_OPEN)  in null_zone_write()
411 		zone->cond = BLK_ZONE_COND_FULL;  in null_zone_write()
421 static blk_status_t null_open_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_open_zone()  argument
425 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_open_zone()
428 	switch (zone->cond) {  in null_open_zone()
433 		ret = null_check_zone_resources(dev, zone);  in null_open_zone()
441 		ret = null_check_zone_resources(dev, zone);  in null_open_zone()
451 	zone->cond = BLK_ZONE_COND_EXP_OPEN;  in null_open_zone()
457 static blk_status_t null_finish_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_finish_zone()  argument
461 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_finish_zone()
464 	switch (zone->cond) {  in null_finish_zone()
469 		ret = null_check_zone_resources(dev, zone);  in null_finish_zone()
480 		ret = null_check_zone_resources(dev, zone);  in null_finish_zone()
489 	zone->cond = BLK_ZONE_COND_FULL;  in null_finish_zone()
490 	zone->wp = zone->start + zone->len;  in null_finish_zone()
495 static blk_status_t null_reset_zone(struct nullb_device *dev, struct blk_zone *zone)  in null_reset_zone()  argument
497 	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)  in null_reset_zone()
500 	switch (zone->cond) {  in null_reset_zone()
519 	zone->cond = BLK_ZONE_COND_EMPTY;  in null_reset_zone()
520 	zone->wp = zone->start;  in null_reset_zone()
530 	struct blk_zone *zone;  in null_zone_mgmt()  local
537 			zone = &dev->zones[i];  in null_zone_mgmt()
538 			if (zone->cond != BLK_ZONE_COND_EMPTY) {  in null_zone_mgmt()
539 				null_reset_zone(dev, zone);  in null_zone_mgmt()
540 				trace_nullb_zone_op(cmd, i, zone->cond);  in null_zone_mgmt()
548 	zone = &dev->zones[zone_no];  in null_zone_mgmt()
554 		ret = null_reset_zone(dev, zone);  in null_zone_mgmt()
557 		ret = null_open_zone(dev, zone);  in null_zone_mgmt()
560 		ret = null_close_zone(dev, zone);  in null_zone_mgmt()
563 		ret = null_finish_zone(dev, zone);  in null_zone_mgmt()
571 		trace_nullb_zone_op(cmd, zone_no, zone->cond);  in null_zone_mgmt()