| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Damien Le Moal | 935 | 96.59% | 2 | 40.00% |
| Dmitry Fomichev | 33 | 3.41% | 3 | 60.00% |
| Total | 968 | 5 |
/* 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)) /* * Zoned block device information. */ struct dmz_dev { struct block_device *bdev; char name[BDEVNAME_SIZE]; sector_t capacity; unsigned int nr_zones; unsigned int flags; sector_t zone_nr_sectors; unsigned int zone_nr_sectors_shift; sector_t zone_nr_blocks; sector_t zone_nr_blocks_shift; }; #define dmz_bio_chunk(dev, bio) ((bio)->bi_iter.bi_sector >> \ (dev)->zone_nr_sectors_shift) #define dmz_chunk_block(dev, b) ((b) & ((dev)->zone_nr_blocks - 1)) /* Device flags. */ #define DMZ_BDEV_DYING (1 << 0) #define DMZ_CHECK_BDEV (2 << 0) /* * Zone descriptor. */ struct dm_zone { /* For listing the zone depending on its state */ struct list_head link; /* Zone type and state */ unsigned long flags; /* Zone activation reference count */ atomic_t refcount; /* 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_RND, DMZ_SEQ, /* Zone critical condition */ DMZ_OFFLINE, DMZ_READ_ONLY, /* How the zone is being used */ DMZ_META, DMZ_DATA, DMZ_BUF, /* Zone internal state */ DMZ_RECLAIM, DMZ_SEQ_WRITE_ERR, }; /* * Zone data accessors. */ #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_seq_write_err(z) test_bit(DMZ_SEQ_WRITE_ERR, &(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("(%s): " format, (dev)->name, ## args) #define dmz_dev_err(dev, format, args...) \ DMERR("(%s): " format, (dev)->name, ## args) #define dmz_dev_warn(dev, format, args...) \ DMWARN("(%s): " format, (dev)->name, ## args) #define dmz_dev_debug(dev, format, args...) \ DMDEBUG("(%s): " format, (dev)->name, ## args) struct dmz_metadata; struct dmz_reclaim; /* * Functions defined in dm-zoned-metadata.c */ int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **zmd); 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); unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone); 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); #define DMZ_ALLOC_RND 0x01 #define DMZ_ALLOC_RECLAIM 0x02 struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, 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_rnd_zones(struct dmz_metadata *zmd); unsigned int dmz_nr_unmap_rnd_zones(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); } /* * 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) { 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); } 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); struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int 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_dev *dev, struct dmz_metadata *zmd, struct dmz_reclaim **zrc); 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); #endif /* DM_ZONED_H */
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