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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Code for manipulating bucket marks for garbage collection.
*
* Copyright 2014 Datera, Inc.
*/
#ifndef _BUCKETS_H
#define _BUCKETS_H
#include "buckets_types.h"
#include "super.h"
#define for_each_bucket(_b, _buckets) \
for (_b = (_buckets)->b + (_buckets)->first_bucket; \
_b < (_buckets)->b + (_buckets)->nbuckets; _b++)
#define bucket_cmpxchg(g, new, expr) \
({ \
u64 _v = atomic64_read(&(g)->_mark.v); \
struct bucket_mark _old; \
\
do { \
(new).v.counter = _old.v.counter = _v; \
expr; \
} while ((_v = atomic64_cmpxchg(&(g)->_mark.v, \
_old.v.counter, \
(new).v.counter)) != _old.v.counter);\
_old; \
})
static inline struct bucket_array *bucket_array(struct bch_dev *ca)
{
return rcu_dereference_check(ca->buckets,
!ca->fs ||
percpu_rwsem_is_held(&ca->fs->usage_lock) ||
lockdep_is_held(&ca->fs->gc_lock) ||
lockdep_is_held(&ca->bucket_lock));
}
static inline struct bucket *bucket(struct bch_dev *ca, size_t b)
{
struct bucket_array *buckets = bucket_array(ca);
BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
return buckets->b + b;
}
static inline void bucket_io_clock_reset(struct bch_fs *c, struct bch_dev *ca,
size_t b, int rw)
{
bucket(ca, b)->io_time[rw] = c->bucket_clock[rw].hand;
}
static inline u16 bucket_last_io(struct bch_fs *c, struct bucket *g, int rw)
{
return c->bucket_clock[rw].hand - g->io_time[rw];
}
/*
* bucket_gc_gen() returns the difference between the bucket's current gen and
* the oldest gen of any pointer into that bucket in the btree.
*/
static inline u8 bucket_gc_gen(struct bch_dev *ca, size_t b)
{
return bucket(ca, b)->mark.gen - ca->oldest_gens[b];
}
static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
const struct bch_extent_ptr *ptr)
{
return sector_to_bucket(ca, ptr->offset);
}
static inline struct bucket *PTR_BUCKET(struct bch_dev *ca,
const struct bch_extent_ptr *ptr)
{
return bucket(ca, PTR_BUCKET_NR(ca, ptr));
}
static inline struct bucket_mark ptr_bucket_mark(struct bch_dev *ca,
const struct bch_extent_ptr *ptr)
{
struct bucket_mark m;
rcu_read_lock();
m = READ_ONCE(bucket(ca, PTR_BUCKET_NR(ca, ptr))->mark);
rcu_read_unlock();
return m;
}
static inline int gen_cmp(u8 a, u8 b)
{
return (s8) (a - b);
}
static inline int gen_after(u8 a, u8 b)
{
int r = gen_cmp(a, b);
return r > 0 ? r : 0;
}
/**
* ptr_stale() - check if a pointer points into a bucket that has been
* invalidated.
*/
static inline u8 ptr_stale(struct bch_dev *ca,
const struct bch_extent_ptr *ptr)
{
return gen_after(ptr_bucket_mark(ca, ptr).gen, ptr->gen);
}
/* bucket gc marks */
static inline unsigned bucket_sectors_used(struct bucket_mark mark)
{
return mark.dirty_sectors + mark.cached_sectors;
}
static inline bool bucket_unused(struct bucket_mark mark)
{
return !mark.owned_by_allocator &&
!mark.data_type &&
!bucket_sectors_used(mark);
}
/* Device usage: */
struct bch_dev_usage __bch2_dev_usage_read(struct bch_dev *);
struct bch_dev_usage bch2_dev_usage_read(struct bch_fs *, struct bch_dev *);
static inline u64 __dev_buckets_available(struct bch_dev *ca,
struct bch_dev_usage stats)
{
u64 total = ca->mi.nbuckets - ca->mi.first_bucket;
if (WARN_ONCE(stats.buckets_unavailable > total,
"buckets_unavailable overflow (%llu > %llu)\n",
stats.buckets_unavailable, total))
return 0;
return total - stats.buckets_unavailable;
}
/*
* Number of reclaimable buckets - only for use by the allocator thread:
*/
static inline u64 dev_buckets_available(struct bch_fs *c, struct bch_dev *ca)
{
return __dev_buckets_available(ca, bch2_dev_usage_read(c, ca));
}
static inline u64 __dev_buckets_free(struct bch_dev *ca,
struct bch_dev_usage stats)
{
return __dev_buckets_available(ca, stats) +
fifo_used(&ca->free[RESERVE_NONE]) +
fifo_used(&ca->free_inc);
}
static inline u64 dev_buckets_free(struct bch_fs *c, struct bch_dev *ca)
{
return __dev_buckets_free(ca, bch2_dev_usage_read(c, ca));
}
/* Filesystem usage: */
struct bch_fs_usage __bch2_fs_usage_read(struct bch_fs *);
struct bch_fs_usage bch2_fs_usage_read(struct bch_fs *);
void bch2_fs_usage_apply(struct bch_fs *, struct bch_fs_usage *,
struct disk_reservation *, struct gc_pos);
u64 bch2_fs_sectors_used(struct bch_fs *, struct bch_fs_usage);
static inline u64 bch2_fs_sectors_free(struct bch_fs *c,
struct bch_fs_usage stats)
{
return c->capacity - bch2_fs_sectors_used(c, stats);
}
static inline bool is_available_bucket(struct bucket_mark mark)
{
return (!mark.owned_by_allocator &&
!mark.dirty_sectors &&
!mark.nouse);
}
static inline bool bucket_needs_journal_commit(struct bucket_mark m,
u16 last_seq_ondisk)
{
return m.journal_seq_valid &&
((s16) m.journal_seq - (s16) last_seq_ondisk > 0);
}
void bch2_bucket_seq_cleanup(struct bch_fs *);
void bch2_invalidate_bucket(struct bch_fs *, struct bch_dev *,
size_t, struct bucket_mark *);
void bch2_mark_alloc_bucket(struct bch_fs *, struct bch_dev *,
size_t, bool, struct gc_pos, unsigned);
void bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
size_t, enum bch_data_type, unsigned,
struct gc_pos, unsigned);
#define BCH_BUCKET_MARK_NOATOMIC (1 << 0)
#define BCH_BUCKET_MARK_MAY_MAKE_UNAVAILABLE (1 << 1)
#define BCH_BUCKET_MARK_GC_WILL_VISIT (1 << 2)
#define BCH_BUCKET_MARK_GC_LOCK_HELD (1 << 3)
void bch2_mark_key(struct bch_fs *, enum bkey_type, struct bkey_s_c,
bool, s64, struct gc_pos,
struct bch_fs_usage *, u64, unsigned);
void bch2_recalc_sectors_available(struct bch_fs *);
void __bch2_disk_reservation_put(struct bch_fs *, struct disk_reservation *);
static inline void bch2_disk_reservation_put(struct bch_fs *c,
struct disk_reservation *res)
{
if (res->sectors)
__bch2_disk_reservation_put(c, res);
}
#define BCH_DISK_RESERVATION_NOFAIL (1 << 0)
#define BCH_DISK_RESERVATION_GC_LOCK_HELD (1 << 1)
#define BCH_DISK_RESERVATION_BTREE_LOCKS_HELD (1 << 2)
int bch2_disk_reservation_add(struct bch_fs *,
struct disk_reservation *,
unsigned, int);
static inline struct disk_reservation
bch2_disk_reservation_init(struct bch_fs *c, unsigned nr_replicas)
{
return (struct disk_reservation) {
.sectors = 0,
#if 0
/* not used yet: */
.gen = c->capacity_gen,
#endif
.nr_replicas = nr_replicas,
};
}
static inline int bch2_disk_reservation_get(struct bch_fs *c,
struct disk_reservation *res,
unsigned sectors,
unsigned nr_replicas,
int flags)
{
*res = bch2_disk_reservation_init(c, nr_replicas);
return bch2_disk_reservation_add(c, res, sectors * nr_replicas, flags);
}
int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
void bch2_dev_buckets_free(struct bch_dev *);
int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);
#endif /* _BUCKETS_H */
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