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680 lines
16 KiB
680 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/vmalloc.h> |
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#include <linux/bitmap.h> |
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#include "null_blk.h" |
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|
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#define CREATE_TRACE_POINTS |
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#include "trace.h" |
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|
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static inline sector_t mb_to_sects(unsigned long mb) |
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{ |
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return ((sector_t)mb * SZ_1M) >> SECTOR_SHIFT; |
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} |
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static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) |
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{ |
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return sect >> ilog2(dev->zone_size_sects); |
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} |
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static inline void null_lock_zone_res(struct nullb_device *dev) |
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{ |
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if (dev->need_zone_res_mgmt) |
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spin_lock_irq(&dev->zone_res_lock); |
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} |
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static inline void null_unlock_zone_res(struct nullb_device *dev) |
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{ |
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if (dev->need_zone_res_mgmt) |
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spin_unlock_irq(&dev->zone_res_lock); |
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} |
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static inline void null_init_zone_lock(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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if (!dev->memory_backed) |
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spin_lock_init(&zone->spinlock); |
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else |
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mutex_init(&zone->mutex); |
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} |
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static inline void null_lock_zone(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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if (!dev->memory_backed) |
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spin_lock_irq(&zone->spinlock); |
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else |
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mutex_lock(&zone->mutex); |
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} |
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static inline void null_unlock_zone(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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if (!dev->memory_backed) |
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spin_unlock_irq(&zone->spinlock); |
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else |
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mutex_unlock(&zone->mutex); |
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} |
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int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) |
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{ |
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sector_t dev_capacity_sects, zone_capacity_sects; |
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struct nullb_zone *zone; |
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sector_t sector = 0; |
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unsigned int i; |
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if (!is_power_of_2(dev->zone_size)) { |
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pr_err("zone_size must be power-of-two\n"); |
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return -EINVAL; |
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} |
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if (dev->zone_size > dev->size) { |
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pr_err("Zone size larger than device capacity\n"); |
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return -EINVAL; |
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} |
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if (!dev->zone_capacity) |
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dev->zone_capacity = dev->zone_size; |
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if (dev->zone_capacity > dev->zone_size) { |
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pr_err("null_blk: zone capacity (%lu MB) larger than zone size (%lu MB)\n", |
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dev->zone_capacity, dev->zone_size); |
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return -EINVAL; |
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} |
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zone_capacity_sects = mb_to_sects(dev->zone_capacity); |
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dev_capacity_sects = mb_to_sects(dev->size); |
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dev->zone_size_sects = mb_to_sects(dev->zone_size); |
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dev->nr_zones = round_up(dev_capacity_sects, dev->zone_size_sects) |
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>> ilog2(dev->zone_size_sects); |
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dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct nullb_zone), |
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GFP_KERNEL | __GFP_ZERO); |
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if (!dev->zones) |
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return -ENOMEM; |
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spin_lock_init(&dev->zone_res_lock); |
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if (dev->zone_nr_conv >= dev->nr_zones) { |
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dev->zone_nr_conv = dev->nr_zones - 1; |
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pr_info("changed the number of conventional zones to %u", |
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dev->zone_nr_conv); |
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} |
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/* Max active zones has to be < nbr of seq zones in order to be enforceable */ |
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if (dev->zone_max_active >= dev->nr_zones - dev->zone_nr_conv) { |
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dev->zone_max_active = 0; |
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pr_info("zone_max_active limit disabled, limit >= zone count\n"); |
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} |
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/* Max open zones has to be <= max active zones */ |
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if (dev->zone_max_active && dev->zone_max_open > dev->zone_max_active) { |
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dev->zone_max_open = dev->zone_max_active; |
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pr_info("changed the maximum number of open zones to %u\n", |
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dev->nr_zones); |
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} else if (dev->zone_max_open >= dev->nr_zones - dev->zone_nr_conv) { |
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dev->zone_max_open = 0; |
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pr_info("zone_max_open limit disabled, limit >= zone count\n"); |
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} |
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dev->need_zone_res_mgmt = dev->zone_max_active || dev->zone_max_open; |
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dev->imp_close_zone_no = dev->zone_nr_conv; |
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for (i = 0; i < dev->zone_nr_conv; i++) { |
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zone = &dev->zones[i]; |
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null_init_zone_lock(dev, zone); |
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zone->start = sector; |
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zone->len = dev->zone_size_sects; |
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zone->capacity = zone->len; |
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zone->wp = zone->start + zone->len; |
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zone->type = BLK_ZONE_TYPE_CONVENTIONAL; |
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zone->cond = BLK_ZONE_COND_NOT_WP; |
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sector += dev->zone_size_sects; |
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} |
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for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { |
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zone = &dev->zones[i]; |
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null_init_zone_lock(dev, zone); |
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zone->start = zone->wp = sector; |
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if (zone->start + dev->zone_size_sects > dev_capacity_sects) |
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zone->len = dev_capacity_sects - zone->start; |
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else |
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zone->len = dev->zone_size_sects; |
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zone->capacity = |
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min_t(sector_t, zone->len, zone_capacity_sects); |
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zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ; |
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zone->cond = BLK_ZONE_COND_EMPTY; |
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sector += dev->zone_size_sects; |
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} |
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return 0; |
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} |
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int null_register_zoned_dev(struct nullb *nullb) |
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{ |
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struct nullb_device *dev = nullb->dev; |
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struct request_queue *q = nullb->q; |
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blk_queue_set_zoned(nullb->disk, BLK_ZONED_HM); |
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blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q); |
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blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE); |
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if (queue_is_mq(q)) { |
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int ret = blk_revalidate_disk_zones(nullb->disk, NULL); |
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if (ret) |
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return ret; |
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} else { |
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blk_queue_chunk_sectors(q, dev->zone_size_sects); |
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q->nr_zones = blkdev_nr_zones(nullb->disk); |
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} |
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blk_queue_max_zone_append_sectors(q, dev->zone_size_sects); |
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blk_queue_max_open_zones(q, dev->zone_max_open); |
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blk_queue_max_active_zones(q, dev->zone_max_active); |
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return 0; |
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} |
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void null_free_zoned_dev(struct nullb_device *dev) |
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{ |
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kvfree(dev->zones); |
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dev->zones = NULL; |
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} |
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int null_report_zones(struct gendisk *disk, sector_t sector, |
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unsigned int nr_zones, report_zones_cb cb, void *data) |
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{ |
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struct nullb *nullb = disk->private_data; |
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struct nullb_device *dev = nullb->dev; |
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unsigned int first_zone, i; |
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struct nullb_zone *zone; |
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struct blk_zone blkz; |
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int error; |
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first_zone = null_zone_no(dev, sector); |
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if (first_zone >= dev->nr_zones) |
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return 0; |
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nr_zones = min(nr_zones, dev->nr_zones - first_zone); |
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trace_nullb_report_zones(nullb, nr_zones); |
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memset(&blkz, 0, sizeof(struct blk_zone)); |
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zone = &dev->zones[first_zone]; |
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for (i = 0; i < nr_zones; i++, zone++) { |
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/* |
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* Stacked DM target drivers will remap the zone information by |
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* modifying the zone information passed to the report callback. |
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* So use a local copy to avoid corruption of the device zone |
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* array. |
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*/ |
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null_lock_zone(dev, zone); |
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blkz.start = zone->start; |
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blkz.len = zone->len; |
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blkz.wp = zone->wp; |
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blkz.type = zone->type; |
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blkz.cond = zone->cond; |
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blkz.capacity = zone->capacity; |
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null_unlock_zone(dev, zone); |
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error = cb(&blkz, i, data); |
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if (error) |
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return error; |
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} |
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return nr_zones; |
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} |
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/* |
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* This is called in the case of memory backing from null_process_cmd() |
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* with the target zone already locked. |
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*/ |
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size_t null_zone_valid_read_len(struct nullb *nullb, |
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sector_t sector, unsigned int len) |
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{ |
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struct nullb_device *dev = nullb->dev; |
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struct nullb_zone *zone = &dev->zones[null_zone_no(dev, sector)]; |
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unsigned int nr_sectors = len >> SECTOR_SHIFT; |
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/* Read must be below the write pointer position */ |
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL || |
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sector + nr_sectors <= zone->wp) |
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return len; |
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if (sector > zone->wp) |
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return 0; |
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return (zone->wp - sector) << SECTOR_SHIFT; |
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} |
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static blk_status_t __null_close_zone(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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switch (zone->cond) { |
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case BLK_ZONE_COND_CLOSED: |
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/* close operation on closed is not an error */ |
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return BLK_STS_OK; |
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case BLK_ZONE_COND_IMP_OPEN: |
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dev->nr_zones_imp_open--; |
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break; |
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case BLK_ZONE_COND_EXP_OPEN: |
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dev->nr_zones_exp_open--; |
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break; |
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case BLK_ZONE_COND_EMPTY: |
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case BLK_ZONE_COND_FULL: |
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default: |
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return BLK_STS_IOERR; |
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} |
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if (zone->wp == zone->start) { |
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zone->cond = BLK_ZONE_COND_EMPTY; |
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} else { |
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zone->cond = BLK_ZONE_COND_CLOSED; |
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dev->nr_zones_closed++; |
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} |
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return BLK_STS_OK; |
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} |
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static void null_close_imp_open_zone(struct nullb_device *dev) |
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{ |
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struct nullb_zone *zone; |
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unsigned int zno, i; |
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zno = dev->imp_close_zone_no; |
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if (zno >= dev->nr_zones) |
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zno = dev->zone_nr_conv; |
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for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { |
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zone = &dev->zones[zno]; |
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zno++; |
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if (zno >= dev->nr_zones) |
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zno = dev->zone_nr_conv; |
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if (zone->cond == BLK_ZONE_COND_IMP_OPEN) { |
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__null_close_zone(dev, zone); |
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dev->imp_close_zone_no = zno; |
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return; |
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} |
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} |
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} |
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static blk_status_t null_check_active(struct nullb_device *dev) |
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{ |
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if (!dev->zone_max_active) |
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return BLK_STS_OK; |
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if (dev->nr_zones_exp_open + dev->nr_zones_imp_open + |
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dev->nr_zones_closed < dev->zone_max_active) |
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return BLK_STS_OK; |
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return BLK_STS_ZONE_ACTIVE_RESOURCE; |
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} |
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static blk_status_t null_check_open(struct nullb_device *dev) |
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{ |
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if (!dev->zone_max_open) |
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return BLK_STS_OK; |
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if (dev->nr_zones_exp_open + dev->nr_zones_imp_open < dev->zone_max_open) |
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return BLK_STS_OK; |
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if (dev->nr_zones_imp_open) { |
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if (null_check_active(dev) == BLK_STS_OK) { |
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null_close_imp_open_zone(dev); |
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return BLK_STS_OK; |
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} |
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} |
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return BLK_STS_ZONE_OPEN_RESOURCE; |
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} |
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/* |
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* This function matches the manage open zone resources function in the ZBC standard, |
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* with the addition of max active zones support (added in the ZNS standard). |
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* |
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* The function determines if a zone can transition to implicit open or explicit open, |
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* while maintaining the max open zone (and max active zone) limit(s). It may close an |
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* implicit open zone in order to make additional zone resources available. |
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* |
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* ZBC states that an implicit open zone shall be closed only if there is not |
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* room within the open limit. However, with the addition of an active limit, |
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* it is not certain that closing an implicit open zone will allow a new zone |
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* to be opened, since we might already be at the active limit capacity. |
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*/ |
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static blk_status_t null_check_zone_resources(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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blk_status_t ret; |
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switch (zone->cond) { |
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case BLK_ZONE_COND_EMPTY: |
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ret = null_check_active(dev); |
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if (ret != BLK_STS_OK) |
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return ret; |
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fallthrough; |
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case BLK_ZONE_COND_CLOSED: |
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return null_check_open(dev); |
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default: |
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/* Should never be called for other states */ |
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WARN_ON(1); |
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return BLK_STS_IOERR; |
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} |
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} |
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static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector, |
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unsigned int nr_sectors, bool append) |
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{ |
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struct nullb_device *dev = cmd->nq->dev; |
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unsigned int zno = null_zone_no(dev, sector); |
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struct nullb_zone *zone = &dev->zones[zno]; |
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blk_status_t ret; |
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trace_nullb_zone_op(cmd, zno, zone->cond); |
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) { |
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if (append) |
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return BLK_STS_IOERR; |
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return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); |
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} |
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null_lock_zone(dev, zone); |
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if (zone->cond == BLK_ZONE_COND_FULL) { |
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/* Cannot write to a full zone */ |
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ret = BLK_STS_IOERR; |
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goto unlock; |
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} |
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/* |
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* Regular writes must be at the write pointer position. |
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* Zone append writes are automatically issued at the write |
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* pointer and the position returned using the request or BIO |
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* sector. |
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*/ |
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if (append) { |
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sector = zone->wp; |
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if (cmd->bio) |
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cmd->bio->bi_iter.bi_sector = sector; |
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else |
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cmd->rq->__sector = sector; |
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} else if (sector != zone->wp) { |
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ret = BLK_STS_IOERR; |
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goto unlock; |
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} |
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if (zone->wp + nr_sectors > zone->start + zone->capacity) { |
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ret = BLK_STS_IOERR; |
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goto unlock; |
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} |
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if (zone->cond == BLK_ZONE_COND_CLOSED || |
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zone->cond == BLK_ZONE_COND_EMPTY) { |
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null_lock_zone_res(dev); |
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ret = null_check_zone_resources(dev, zone); |
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if (ret != BLK_STS_OK) { |
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null_unlock_zone_res(dev); |
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goto unlock; |
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} |
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if (zone->cond == BLK_ZONE_COND_CLOSED) { |
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dev->nr_zones_closed--; |
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dev->nr_zones_imp_open++; |
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} else if (zone->cond == BLK_ZONE_COND_EMPTY) { |
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dev->nr_zones_imp_open++; |
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} |
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if (zone->cond != BLK_ZONE_COND_EXP_OPEN) |
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zone->cond = BLK_ZONE_COND_IMP_OPEN; |
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null_unlock_zone_res(dev); |
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} |
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ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); |
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if (ret != BLK_STS_OK) |
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goto unlock; |
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zone->wp += nr_sectors; |
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if (zone->wp == zone->start + zone->capacity) { |
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null_lock_zone_res(dev); |
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if (zone->cond == BLK_ZONE_COND_EXP_OPEN) |
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dev->nr_zones_exp_open--; |
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else if (zone->cond == BLK_ZONE_COND_IMP_OPEN) |
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dev->nr_zones_imp_open--; |
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zone->cond = BLK_ZONE_COND_FULL; |
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null_unlock_zone_res(dev); |
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} |
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ret = BLK_STS_OK; |
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unlock: |
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null_unlock_zone(dev, zone); |
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return ret; |
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} |
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static blk_status_t null_open_zone(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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blk_status_t ret = BLK_STS_OK; |
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
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return BLK_STS_IOERR; |
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null_lock_zone_res(dev); |
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switch (zone->cond) { |
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case BLK_ZONE_COND_EXP_OPEN: |
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/* open operation on exp open is not an error */ |
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goto unlock; |
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case BLK_ZONE_COND_EMPTY: |
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ret = null_check_zone_resources(dev, zone); |
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if (ret != BLK_STS_OK) |
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goto unlock; |
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break; |
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case BLK_ZONE_COND_IMP_OPEN: |
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dev->nr_zones_imp_open--; |
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break; |
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case BLK_ZONE_COND_CLOSED: |
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ret = null_check_zone_resources(dev, zone); |
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if (ret != BLK_STS_OK) |
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goto unlock; |
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dev->nr_zones_closed--; |
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break; |
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case BLK_ZONE_COND_FULL: |
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default: |
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ret = BLK_STS_IOERR; |
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goto unlock; |
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} |
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zone->cond = BLK_ZONE_COND_EXP_OPEN; |
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dev->nr_zones_exp_open++; |
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unlock: |
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null_unlock_zone_res(dev); |
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|
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return ret; |
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} |
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|
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static blk_status_t null_close_zone(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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blk_status_t ret; |
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|
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
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return BLK_STS_IOERR; |
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null_lock_zone_res(dev); |
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ret = __null_close_zone(dev, zone); |
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null_unlock_zone_res(dev); |
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|
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return ret; |
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} |
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|
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static blk_status_t null_finish_zone(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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blk_status_t ret = BLK_STS_OK; |
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|
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
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return BLK_STS_IOERR; |
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null_lock_zone_res(dev); |
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|
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switch (zone->cond) { |
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case BLK_ZONE_COND_FULL: |
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/* finish operation on full is not an error */ |
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goto unlock; |
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case BLK_ZONE_COND_EMPTY: |
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ret = null_check_zone_resources(dev, zone); |
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if (ret != BLK_STS_OK) |
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goto unlock; |
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break; |
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case BLK_ZONE_COND_IMP_OPEN: |
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dev->nr_zones_imp_open--; |
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break; |
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case BLK_ZONE_COND_EXP_OPEN: |
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dev->nr_zones_exp_open--; |
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break; |
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case BLK_ZONE_COND_CLOSED: |
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ret = null_check_zone_resources(dev, zone); |
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if (ret != BLK_STS_OK) |
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goto unlock; |
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dev->nr_zones_closed--; |
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break; |
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default: |
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ret = BLK_STS_IOERR; |
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goto unlock; |
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} |
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|
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zone->cond = BLK_ZONE_COND_FULL; |
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zone->wp = zone->start + zone->len; |
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|
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unlock: |
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null_unlock_zone_res(dev); |
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|
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return ret; |
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} |
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|
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static blk_status_t null_reset_zone(struct nullb_device *dev, |
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struct nullb_zone *zone) |
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{ |
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if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
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return BLK_STS_IOERR; |
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|
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null_lock_zone_res(dev); |
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|
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switch (zone->cond) { |
|
case BLK_ZONE_COND_EMPTY: |
|
/* reset operation on empty is not an error */ |
|
null_unlock_zone_res(dev); |
|
return BLK_STS_OK; |
|
case BLK_ZONE_COND_IMP_OPEN: |
|
dev->nr_zones_imp_open--; |
|
break; |
|
case BLK_ZONE_COND_EXP_OPEN: |
|
dev->nr_zones_exp_open--; |
|
break; |
|
case BLK_ZONE_COND_CLOSED: |
|
dev->nr_zones_closed--; |
|
break; |
|
case BLK_ZONE_COND_FULL: |
|
break; |
|
default: |
|
null_unlock_zone_res(dev); |
|
return BLK_STS_IOERR; |
|
} |
|
|
|
zone->cond = BLK_ZONE_COND_EMPTY; |
|
zone->wp = zone->start; |
|
|
|
null_unlock_zone_res(dev); |
|
|
|
if (dev->memory_backed) |
|
return null_handle_discard(dev, zone->start, zone->len); |
|
|
|
return BLK_STS_OK; |
|
} |
|
|
|
static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op, |
|
sector_t sector) |
|
{ |
|
struct nullb_device *dev = cmd->nq->dev; |
|
unsigned int zone_no; |
|
struct nullb_zone *zone; |
|
blk_status_t ret; |
|
size_t i; |
|
|
|
if (op == REQ_OP_ZONE_RESET_ALL) { |
|
for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { |
|
zone = &dev->zones[i]; |
|
null_lock_zone(dev, zone); |
|
if (zone->cond != BLK_ZONE_COND_EMPTY) { |
|
null_reset_zone(dev, zone); |
|
trace_nullb_zone_op(cmd, i, zone->cond); |
|
} |
|
null_unlock_zone(dev, zone); |
|
} |
|
return BLK_STS_OK; |
|
} |
|
|
|
zone_no = null_zone_no(dev, sector); |
|
zone = &dev->zones[zone_no]; |
|
|
|
null_lock_zone(dev, zone); |
|
|
|
switch (op) { |
|
case REQ_OP_ZONE_RESET: |
|
ret = null_reset_zone(dev, zone); |
|
break; |
|
case REQ_OP_ZONE_OPEN: |
|
ret = null_open_zone(dev, zone); |
|
break; |
|
case REQ_OP_ZONE_CLOSE: |
|
ret = null_close_zone(dev, zone); |
|
break; |
|
case REQ_OP_ZONE_FINISH: |
|
ret = null_finish_zone(dev, zone); |
|
break; |
|
default: |
|
ret = BLK_STS_NOTSUPP; |
|
break; |
|
} |
|
|
|
if (ret == BLK_STS_OK) |
|
trace_nullb_zone_op(cmd, zone_no, zone->cond); |
|
|
|
null_unlock_zone(dev, zone); |
|
|
|
return ret; |
|
} |
|
|
|
blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op, |
|
sector_t sector, sector_t nr_sectors) |
|
{ |
|
struct nullb_device *dev; |
|
struct nullb_zone *zone; |
|
blk_status_t sts; |
|
|
|
switch (op) { |
|
case REQ_OP_WRITE: |
|
return null_zone_write(cmd, sector, nr_sectors, false); |
|
case REQ_OP_ZONE_APPEND: |
|
return null_zone_write(cmd, sector, nr_sectors, true); |
|
case REQ_OP_ZONE_RESET: |
|
case REQ_OP_ZONE_RESET_ALL: |
|
case REQ_OP_ZONE_OPEN: |
|
case REQ_OP_ZONE_CLOSE: |
|
case REQ_OP_ZONE_FINISH: |
|
return null_zone_mgmt(cmd, op, sector); |
|
default: |
|
dev = cmd->nq->dev; |
|
zone = &dev->zones[null_zone_no(dev, sector)]; |
|
|
|
null_lock_zone(dev, zone); |
|
sts = null_process_cmd(cmd, op, sector, nr_sectors); |
|
null_unlock_zone(dev, zone); |
|
return sts; |
|
} |
|
}
|
|
|