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34f5affd04
Instead of lumping emulated zones together with random zones we should be handling them as separate 'cache' zones. This improves code readability and allows an easier implementation of different cache policies. Also add additional allocation flags, to separate the type (cache, random, or sequential) from the purpose (eg reclaim). Also switch the allocation policy to not use random zones as buffer zones if cache zones are present. This avoids a performance drop when all cache zones are used. Signed-off-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
281 lines
8.2 KiB
C
281 lines
8.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2017 Western Digital Corporation or its affiliates.
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*
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* This file is released under the GPL.
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*/
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#ifndef DM_ZONED_H
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#define DM_ZONED_H
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#include <linux/types.h>
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#include <linux/blkdev.h>
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#include <linux/device-mapper.h>
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#include <linux/dm-kcopyd.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/rwsem.h>
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#include <linux/rbtree.h>
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#include <linux/radix-tree.h>
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#include <linux/shrinker.h>
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/*
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* dm-zoned creates block devices with 4KB blocks, always.
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*/
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#define DMZ_BLOCK_SHIFT 12
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#define DMZ_BLOCK_SIZE (1 << DMZ_BLOCK_SHIFT)
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#define DMZ_BLOCK_MASK (DMZ_BLOCK_SIZE - 1)
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#define DMZ_BLOCK_SHIFT_BITS (DMZ_BLOCK_SHIFT + 3)
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#define DMZ_BLOCK_SIZE_BITS (1 << DMZ_BLOCK_SHIFT_BITS)
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#define DMZ_BLOCK_MASK_BITS (DMZ_BLOCK_SIZE_BITS - 1)
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#define DMZ_BLOCK_SECTORS_SHIFT (DMZ_BLOCK_SHIFT - SECTOR_SHIFT)
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#define DMZ_BLOCK_SECTORS (DMZ_BLOCK_SIZE >> SECTOR_SHIFT)
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#define DMZ_BLOCK_SECTORS_MASK (DMZ_BLOCK_SECTORS - 1)
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/*
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* 4KB block <-> 512B sector conversion.
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*/
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#define dmz_blk2sect(b) ((sector_t)(b) << DMZ_BLOCK_SECTORS_SHIFT)
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#define dmz_sect2blk(s) ((sector_t)(s) >> DMZ_BLOCK_SECTORS_SHIFT)
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#define dmz_bio_block(bio) dmz_sect2blk((bio)->bi_iter.bi_sector)
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#define dmz_bio_blocks(bio) dmz_sect2blk(bio_sectors(bio))
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/*
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* Zoned block device information.
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*/
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struct dmz_dev {
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struct block_device *bdev;
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char name[BDEVNAME_SIZE];
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uuid_t uuid;
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sector_t capacity;
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unsigned int nr_zones;
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unsigned int zone_offset;
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unsigned int flags;
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sector_t zone_nr_sectors;
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};
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#define dmz_bio_chunk(zmd, bio) ((bio)->bi_iter.bi_sector >> \
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dmz_zone_nr_sectors_shift(zmd))
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#define dmz_chunk_block(zmd, b) ((b) & (dmz_zone_nr_blocks(zmd) - 1))
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/* Device flags. */
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#define DMZ_BDEV_DYING (1 << 0)
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#define DMZ_CHECK_BDEV (2 << 0)
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#define DMZ_BDEV_REGULAR (4 << 0)
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/*
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* Zone descriptor.
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*/
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struct dm_zone {
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/* For listing the zone depending on its state */
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struct list_head link;
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/* Zone type and state */
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unsigned long flags;
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/* Zone activation reference count */
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atomic_t refcount;
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/* Zone id */
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unsigned int id;
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/* Zone write pointer block (relative to the zone start block) */
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unsigned int wp_block;
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/* Zone weight (number of valid blocks in the zone) */
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unsigned int weight;
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/* The chunk that the zone maps */
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unsigned int chunk;
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/*
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* For a sequential data zone, pointer to the random zone
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* used as a buffer for processing unaligned writes.
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* For a buffer zone, this points back to the data zone.
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*/
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struct dm_zone *bzone;
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};
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/*
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* Zone flags.
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*/
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enum {
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/* Zone write type */
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DMZ_CACHE,
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DMZ_RND,
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DMZ_SEQ,
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/* Zone critical condition */
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DMZ_OFFLINE,
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DMZ_READ_ONLY,
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/* How the zone is being used */
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DMZ_META,
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DMZ_DATA,
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DMZ_BUF,
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/* Zone internal state */
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DMZ_RECLAIM,
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DMZ_SEQ_WRITE_ERR,
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};
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/*
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* Zone data accessors.
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*/
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#define dmz_is_cache(z) test_bit(DMZ_CACHE, &(z)->flags)
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#define dmz_is_rnd(z) test_bit(DMZ_RND, &(z)->flags)
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#define dmz_is_seq(z) test_bit(DMZ_SEQ, &(z)->flags)
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#define dmz_is_empty(z) ((z)->wp_block == 0)
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#define dmz_is_offline(z) test_bit(DMZ_OFFLINE, &(z)->flags)
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#define dmz_is_readonly(z) test_bit(DMZ_READ_ONLY, &(z)->flags)
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#define dmz_in_reclaim(z) test_bit(DMZ_RECLAIM, &(z)->flags)
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#define dmz_seq_write_err(z) test_bit(DMZ_SEQ_WRITE_ERR, &(z)->flags)
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#define dmz_is_meta(z) test_bit(DMZ_META, &(z)->flags)
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#define dmz_is_buf(z) test_bit(DMZ_BUF, &(z)->flags)
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#define dmz_is_data(z) test_bit(DMZ_DATA, &(z)->flags)
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#define dmz_weight(z) ((z)->weight)
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/*
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* Message functions.
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*/
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#define dmz_dev_info(dev, format, args...) \
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DMINFO("(%s): " format, (dev)->name, ## args)
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#define dmz_dev_err(dev, format, args...) \
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DMERR("(%s): " format, (dev)->name, ## args)
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#define dmz_dev_warn(dev, format, args...) \
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DMWARN("(%s): " format, (dev)->name, ## args)
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#define dmz_dev_debug(dev, format, args...) \
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DMDEBUG("(%s): " format, (dev)->name, ## args)
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struct dmz_metadata;
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struct dmz_reclaim;
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/*
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* Functions defined in dm-zoned-metadata.c
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*/
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int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
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struct dmz_metadata **zmd, const char *devname);
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void dmz_dtr_metadata(struct dmz_metadata *zmd);
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int dmz_resume_metadata(struct dmz_metadata *zmd);
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void dmz_lock_map(struct dmz_metadata *zmd);
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void dmz_unlock_map(struct dmz_metadata *zmd);
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void dmz_lock_metadata(struct dmz_metadata *zmd);
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void dmz_unlock_metadata(struct dmz_metadata *zmd);
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void dmz_lock_flush(struct dmz_metadata *zmd);
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void dmz_unlock_flush(struct dmz_metadata *zmd);
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int dmz_flush_metadata(struct dmz_metadata *zmd);
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const char *dmz_metadata_label(struct dmz_metadata *zmd);
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sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone);
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sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone);
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unsigned int dmz_nr_chunks(struct dmz_metadata *zmd);
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struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone);
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bool dmz_check_dev(struct dmz_metadata *zmd);
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bool dmz_dev_is_dying(struct dmz_metadata *zmd);
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#define DMZ_ALLOC_RND 0x01
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#define DMZ_ALLOC_CACHE 0x02
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#define DMZ_ALLOC_SEQ 0x04
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#define DMZ_ALLOC_RECLAIM 0x10
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struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags);
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void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
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void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *zone,
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unsigned int chunk);
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void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
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unsigned int dmz_nr_zones(struct dmz_metadata *zmd);
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unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd);
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unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd);
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unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd);
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unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd);
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unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd);
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unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd);
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unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd);
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unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd);
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unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd);
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unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd);
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/*
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* Activate a zone (increment its reference count).
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*/
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static inline void dmz_activate_zone(struct dm_zone *zone)
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{
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atomic_inc(&zone->refcount);
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}
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/*
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* Deactivate a zone. This decrement the zone reference counter
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* indicating that all BIOs to the zone have completed when the count is 0.
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*/
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static inline void dmz_deactivate_zone(struct dm_zone *zone)
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{
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atomic_dec(&zone->refcount);
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}
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/*
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* Test if a zone is active, that is, has a refcount > 0.
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*/
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static inline bool dmz_is_active(struct dm_zone *zone)
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{
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return atomic_read(&zone->refcount);
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}
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int dmz_lock_zone_reclaim(struct dm_zone *zone);
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void dmz_unlock_zone_reclaim(struct dm_zone *zone);
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struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd);
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struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd,
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unsigned int chunk, int op);
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void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *zone);
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struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
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struct dm_zone *dzone);
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int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
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sector_t chunk_block, unsigned int nr_blocks);
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int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
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sector_t chunk_block, unsigned int nr_blocks);
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int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone,
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sector_t chunk_block);
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int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone,
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sector_t *chunk_block);
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int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
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struct dm_zone *to_zone);
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int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
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struct dm_zone *to_zone, sector_t chunk_block);
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/*
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* Functions defined in dm-zoned-reclaim.c
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*/
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int dmz_ctr_reclaim(struct dmz_metadata *zmd, struct dmz_reclaim **zrc);
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void dmz_dtr_reclaim(struct dmz_reclaim *zrc);
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void dmz_suspend_reclaim(struct dmz_reclaim *zrc);
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void dmz_resume_reclaim(struct dmz_reclaim *zrc);
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void dmz_reclaim_bio_acc(struct dmz_reclaim *zrc);
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void dmz_schedule_reclaim(struct dmz_reclaim *zrc);
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/*
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* Functions defined in dm-zoned-target.c
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*/
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bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev);
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bool dmz_check_bdev(struct dmz_dev *dmz_dev);
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#endif /* DM_ZONED_H */
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