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Diffstat (limited to '')
| -rw-r--r-- | drivers/md/dm-zoned.h | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h new file mode 100644 index 000000000..265494d3f --- /dev/null +++ b/drivers/md/dm-zoned.h @@ -0,0 +1,303 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2017 Western Digital Corporation or its affiliates. + * + * This file is released under the GPL. + */ + +#ifndef DM_ZONED_H +#define DM_ZONED_H + +#include <linux/types.h> +#include <linux/blkdev.h> +#include <linux/device-mapper.h> +#include <linux/dm-kcopyd.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> +#include <linux/workqueue.h> +#include <linux/rwsem.h> +#include <linux/rbtree.h> +#include <linux/radix-tree.h> +#include <linux/shrinker.h> + +/* + * dm-zoned creates block devices with 4KB blocks, always. + */ +#define DMZ_BLOCK_SHIFT 12 +#define DMZ_BLOCK_SIZE (1 << DMZ_BLOCK_SHIFT) +#define DMZ_BLOCK_MASK (DMZ_BLOCK_SIZE - 1) + +#define DMZ_BLOCK_SHIFT_BITS (DMZ_BLOCK_SHIFT + 3) +#define DMZ_BLOCK_SIZE_BITS (1 << DMZ_BLOCK_SHIFT_BITS) +#define DMZ_BLOCK_MASK_BITS (DMZ_BLOCK_SIZE_BITS - 1) + +#define DMZ_BLOCK_SECTORS_SHIFT (DMZ_BLOCK_SHIFT - SECTOR_SHIFT) +#define DMZ_BLOCK_SECTORS (DMZ_BLOCK_SIZE >> SECTOR_SHIFT) +#define DMZ_BLOCK_SECTORS_MASK (DMZ_BLOCK_SECTORS - 1) + +/* + * 4KB block <-> 512B sector conversion. + */ +#define dmz_blk2sect(b) ((sector_t)(b) << DMZ_BLOCK_SECTORS_SHIFT) +#define dmz_sect2blk(s) ((sector_t)(s) >> DMZ_BLOCK_SECTORS_SHIFT) + +#define dmz_bio_block(bio) dmz_sect2blk((bio)->bi_iter.bi_sector) +#define dmz_bio_blocks(bio) dmz_sect2blk(bio_sectors(bio)) + +struct dmz_metadata; +struct dmz_reclaim; + +/* + * Zoned block device information. + */ +struct dmz_dev { + struct block_device *bdev; + struct dmz_metadata *metadata; + struct dmz_reclaim *reclaim; + + uuid_t uuid; + + sector_t capacity; + + unsigned int dev_idx; + + unsigned int nr_zones; + unsigned int zone_offset; + + unsigned int flags; + + sector_t zone_nr_sectors; + + unsigned int nr_rnd; + atomic_t unmap_nr_rnd; + struct list_head unmap_rnd_list; + struct list_head map_rnd_list; + + unsigned int nr_seq; + atomic_t unmap_nr_seq; + struct list_head unmap_seq_list; + struct list_head map_seq_list; +}; + +#define dmz_bio_chunk(zmd, bio) ((bio)->bi_iter.bi_sector >> \ + dmz_zone_nr_sectors_shift(zmd)) +#define dmz_chunk_block(zmd, b) ((b) & (dmz_zone_nr_blocks(zmd) - 1)) + +/* Device flags. */ +#define DMZ_BDEV_DYING (1 << 0) +#define DMZ_CHECK_BDEV (2 << 0) +#define DMZ_BDEV_REGULAR (4 << 0) + +/* + * Zone descriptor. + */ +struct dm_zone { + /* For listing the zone depending on its state */ + struct list_head link; + + /* Device containing this zone */ + struct dmz_dev *dev; + + /* Zone type and state */ + unsigned long flags; + + /* Zone activation reference count */ + atomic_t refcount; + + /* Zone id */ + unsigned int id; + + /* Zone write pointer block (relative to the zone start block) */ + unsigned int wp_block; + + /* Zone weight (number of valid blocks in the zone) */ + unsigned int weight; + + /* The chunk that the zone maps */ + unsigned int chunk; + + /* + * For a sequential data zone, pointer to the random zone + * used as a buffer for processing unaligned writes. + * For a buffer zone, this points back to the data zone. + */ + struct dm_zone *bzone; +}; + +/* + * Zone flags. + */ +enum { + /* Zone write type */ + DMZ_CACHE, + DMZ_RND, + DMZ_SEQ, + + /* Zone critical condition */ + DMZ_OFFLINE, + DMZ_READ_ONLY, + + /* How the zone is being used */ + DMZ_META, + DMZ_DATA, + DMZ_BUF, + DMZ_RESERVED, + + /* Zone internal state */ + DMZ_RECLAIM, + DMZ_SEQ_WRITE_ERR, + DMZ_RECLAIM_TERMINATE, +}; + +/* + * Zone data accessors. + */ +#define dmz_is_cache(z) test_bit(DMZ_CACHE, &(z)->flags) +#define dmz_is_rnd(z) test_bit(DMZ_RND, &(z)->flags) +#define dmz_is_seq(z) test_bit(DMZ_SEQ, &(z)->flags) +#define dmz_is_empty(z) ((z)->wp_block == 0) +#define dmz_is_offline(z) test_bit(DMZ_OFFLINE, &(z)->flags) +#define dmz_is_readonly(z) test_bit(DMZ_READ_ONLY, &(z)->flags) +#define dmz_in_reclaim(z) test_bit(DMZ_RECLAIM, &(z)->flags) +#define dmz_is_reserved(z) test_bit(DMZ_RESERVED, &(z)->flags) +#define dmz_seq_write_err(z) test_bit(DMZ_SEQ_WRITE_ERR, &(z)->flags) +#define dmz_reclaim_should_terminate(z) \ + test_bit(DMZ_RECLAIM_TERMINATE, &(z)->flags) + +#define dmz_is_meta(z) test_bit(DMZ_META, &(z)->flags) +#define dmz_is_buf(z) test_bit(DMZ_BUF, &(z)->flags) +#define dmz_is_data(z) test_bit(DMZ_DATA, &(z)->flags) + +#define dmz_weight(z) ((z)->weight) + +/* + * Message functions. + */ +#define dmz_dev_info(dev, format, args...) \ + DMINFO("(%pg): " format, (dev)->bdev, ## args) + +#define dmz_dev_err(dev, format, args...) \ + DMERR("(%pg): " format, (dev)->bdev, ## args) + +#define dmz_dev_warn(dev, format, args...) \ + DMWARN("(%pg): " format, (dev)->bdev, ## args) + +#define dmz_dev_debug(dev, format, args...) \ + DMDEBUG("(%pg): " format, (dev)->bdev, ## args) + +/* + * Functions defined in dm-zoned-metadata.c + */ +int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, + struct dmz_metadata **zmd, const char *devname); +void dmz_dtr_metadata(struct dmz_metadata *zmd); +int dmz_resume_metadata(struct dmz_metadata *zmd); + +void dmz_lock_map(struct dmz_metadata *zmd); +void dmz_unlock_map(struct dmz_metadata *zmd); +void dmz_lock_metadata(struct dmz_metadata *zmd); +void dmz_unlock_metadata(struct dmz_metadata *zmd); +void dmz_lock_flush(struct dmz_metadata *zmd); +void dmz_unlock_flush(struct dmz_metadata *zmd); +int dmz_flush_metadata(struct dmz_metadata *zmd); +const char *dmz_metadata_label(struct dmz_metadata *zmd); + +sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone); +sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone); +unsigned int dmz_nr_chunks(struct dmz_metadata *zmd); + +bool dmz_check_dev(struct dmz_metadata *zmd); +bool dmz_dev_is_dying(struct dmz_metadata *zmd); + +#define DMZ_ALLOC_RND 0x01 +#define DMZ_ALLOC_CACHE 0x02 +#define DMZ_ALLOC_SEQ 0x04 +#define DMZ_ALLOC_RECLAIM 0x10 + +struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, + unsigned int dev_idx, unsigned long flags); +void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone); + +void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *zone, + unsigned int chunk); +void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone); +unsigned int dmz_nr_zones(struct dmz_metadata *zmd); +unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd); +unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd); +unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx); +unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx); +unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd, int idx); +unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx); +unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd); +unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd); +unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd); +unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd); + +/* + * Activate a zone (increment its reference count). + */ +static inline void dmz_activate_zone(struct dm_zone *zone) +{ + atomic_inc(&zone->refcount); +} + +int dmz_lock_zone_reclaim(struct dm_zone *zone); +void dmz_unlock_zone_reclaim(struct dm_zone *zone); +struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, + unsigned int dev_idx, bool idle); + +struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, + unsigned int chunk, enum req_op op); +void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *zone); +struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, + struct dm_zone *dzone); + +int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, + sector_t chunk_block, unsigned int nr_blocks); +int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, + sector_t chunk_block, unsigned int nr_blocks); +int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, + sector_t chunk_block); +int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, + sector_t *chunk_block); +int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, + struct dm_zone *to_zone); +int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, + struct dm_zone *to_zone, sector_t chunk_block); + +/* + * Functions defined in dm-zoned-reclaim.c + */ +int dmz_ctr_reclaim(struct dmz_metadata *zmd, struct dmz_reclaim **zrc, int idx); +void dmz_dtr_reclaim(struct dmz_reclaim *zrc); +void dmz_suspend_reclaim(struct dmz_reclaim *zrc); +void dmz_resume_reclaim(struct dmz_reclaim *zrc); +void dmz_reclaim_bio_acc(struct dmz_reclaim *zrc); +void dmz_schedule_reclaim(struct dmz_reclaim *zrc); + +/* + * Functions defined in dm-zoned-target.c + */ +bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev); +bool dmz_check_bdev(struct dmz_dev *dmz_dev); + +/* + * Deactivate a zone. This decrement the zone reference counter + * indicating that all BIOs to the zone have completed when the count is 0. + */ +static inline void dmz_deactivate_zone(struct dm_zone *zone) +{ + dmz_reclaim_bio_acc(zone->dev->reclaim); + atomic_dec(&zone->refcount); +} + +/* + * Test if a zone is active, that is, has a refcount > 0. + */ +static inline bool dmz_is_active(struct dm_zone *zone) +{ + return atomic_read(&zone->refcount); +} + +#endif /* DM_ZONED_H */ |