mirror of
https://github.com/koverstreet/bcachefs-tools.git
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117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
#ifndef _BCACHE_SUPER_H
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#define _BCACHE_SUPER_H
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#include "extents.h"
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static inline size_t sector_to_bucket(const struct cache *ca, sector_t s)
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{
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return s >> ca->bucket_bits;
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}
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static inline sector_t bucket_to_sector(const struct cache *ca, size_t b)
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{
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return ((sector_t) b) << ca->bucket_bits;
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}
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static inline sector_t bucket_remainder(const struct cache *ca, sector_t s)
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{
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return s & (ca->mi.bucket_size - 1);
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}
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static inline struct cache *bch_next_cache_rcu(struct cache_set *c,
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unsigned *iter)
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{
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struct cache *ret = NULL;
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while (*iter < c->sb.nr_devices &&
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!(ret = rcu_dereference(c->cache[*iter])))
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(*iter)++;
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return ret;
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}
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#define for_each_cache_rcu(ca, c, iter) \
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for ((iter) = 0; ((ca) = bch_next_cache_rcu((c), &(iter))); (iter)++)
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static inline struct cache *bch_get_next_cache(struct cache_set *c,
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unsigned *iter)
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{
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struct cache *ret;
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rcu_read_lock();
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if ((ret = bch_next_cache_rcu(c, iter)))
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percpu_ref_get(&ret->ref);
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rcu_read_unlock();
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return ret;
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}
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/*
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* If you break early, you must drop your ref on the current cache
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*/
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#define for_each_cache(ca, c, iter) \
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for ((iter) = 0; \
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(ca = bch_get_next_cache(c, &(iter))); \
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percpu_ref_put(&ca->ref), (iter)++)
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static inline bool bch_dev_may_remove(struct cache *ca)
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{
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struct cache_set *c = ca->set;
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struct cache_group *tier = &c->cache_tiers[ca->mi.tier];
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/*
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* Right now, we can't remove the last device from a tier,
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* - For tier 0, because all metadata lives in tier 0 and because
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* there is no way to have foreground writes go directly to tier 1.
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* - For tier 1, because the code doesn't completely support an
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* empty tier 1.
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*/
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/*
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* Turning a device read-only removes it from the cache group,
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* so there may only be one read-write device in a tier, and yet
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* the device we are removing is in the same tier, so we have
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* to check for identity.
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* Removing the last RW device from a tier requires turning the
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* whole cache set RO.
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*/
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return tier->nr_devices != 1 ||
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rcu_access_pointer(tier->d[0].dev) != ca;
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}
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void bch_dev_release(struct kobject *);
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bool bch_dev_read_only(struct cache *);
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const char *bch_dev_read_write(struct cache *);
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bool bch_dev_remove(struct cache *, bool force);
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int bch_dev_add(struct cache_set *, const char *);
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void bch_fs_detach(struct cache_set *);
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bool bch_fs_read_only(struct cache_set *);
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bool bch_fs_emergency_read_only(struct cache_set *);
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void bch_fs_read_only_sync(struct cache_set *);
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const char *bch_fs_read_write(struct cache_set *);
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void bch_fs_release(struct kobject *);
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void bch_fs_stop(struct cache_set *);
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void bch_fs_stop_sync(struct cache_set *);
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const char *bch_fs_open(char * const *, unsigned, struct bch_opts,
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struct cache_set **);
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const char *bch_fs_open_incremental(const char *path);
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extern struct mutex bch_register_lock;
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extern struct list_head bch_fs_list;
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extern struct workqueue_struct *bcache_io_wq;
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extern struct crypto_shash *bch_sha256;
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extern struct kobj_type bch_fs_ktype;
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extern struct kobj_type bch_fs_internal_ktype;
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extern struct kobj_type bch_fs_time_stats_ktype;
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extern struct kobj_type bch_fs_opts_dir_ktype;
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extern struct kobj_type bch_dev_ktype;
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#endif /* _BCACHE_SUPER_H */
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