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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) \
({ \
struct bucket *_g = g; \
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,
bool gc)
{
return rcu_dereference_check(ca->buckets[gc],
!ca->fs ||
percpu_rwsem_is_held(&ca->fs->mark_lock) ||
lockdep_is_held(&ca->fs->gc_lock) ||
lockdep_is_held(&ca->bucket_lock));
}
static inline struct bucket_array *bucket_array(struct bch_dev *ca)
{
return __bucket_array(ca, false);
}
static inline struct bucket *__bucket(struct bch_dev *ca, size_t b, bool gc)
{
struct bucket_array *buckets = __bucket_array(ca, gc);
BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
return buckets->b + b;
}
static inline struct bucket *gc_bucket(struct bch_dev *ca, size_t b)
{
return __bucket(ca, b, true);
}
static inline struct bucket *bucket(struct bch_dev *ca, size_t b)
{
return __bucket(ca, b, false);
}
static inline struct bucket_gens *bucket_gens(struct bch_dev *ca)
{
return rcu_dereference_check(ca->bucket_gens,
!ca->fs ||
percpu_rwsem_is_held(&ca->fs->mark_lock) ||
lockdep_is_held(&ca->fs->gc_lock) ||
lockdep_is_held(&ca->bucket_lock));
}
static inline u8 *bucket_gen(struct bch_dev *ca, size_t b)
{
struct bucket_gens *gens = bucket_gens(ca);
BUG_ON(b < gens->first_bucket || b >= gens->nbuckets);
return gens->b + b;
}
/*
* 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 bucket *g)
{
return g->mark.gen - g->oldest_gen;
}
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 *PTR_GC_BUCKET(struct bch_dev *ca,
const struct bch_extent_ptr *ptr)
{
return gc_bucket(ca, PTR_BUCKET_NR(ca, ptr));
}
static inline enum bch_data_type ptr_data_type(const struct bkey *k,
const struct bch_extent_ptr *ptr)
{
if (k->type == KEY_TYPE_btree_ptr ||
k->type == KEY_TYPE_btree_ptr_v2)
return BCH_DATA_btree;
return ptr->cached ? BCH_DATA_cached : BCH_DATA_user;
}
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)
{
u8 ret;
rcu_read_lock();
ret = gen_after(*bucket_gen(ca, PTR_BUCKET_NR(ca, ptr)), ptr->gen);
rcu_read_unlock();
return ret;
}
/* bucket gc marks */
static inline unsigned bucket_sectors_used(struct bucket_mark mark)
{
return mark.dirty_sectors + mark.cached_sectors;
}
static inline bool is_available_bucket(struct bucket_mark mark)
{
return !mark.dirty_sectors && !mark.stripe;
}
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);
}
/* Device usage: */
struct bch_dev_usage bch2_dev_usage_read(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;
}
static inline u64 dev_buckets_available(struct bch_dev *ca)
{
return __dev_buckets_available(ca, bch2_dev_usage_read(ca));
}
static inline u64 __dev_buckets_reclaimable(struct bch_dev *ca,
struct bch_dev_usage stats)
{
struct bch_fs *c = ca->fs;
s64 available = __dev_buckets_available(ca, stats);
unsigned i;
spin_lock(&c->freelist_lock);
for (i = 0; i < RESERVE_NR; i++)
available -= fifo_used(&ca->free[i]);
available -= fifo_used(&ca->free_inc);
available -= ca->nr_open_buckets;
spin_unlock(&c->freelist_lock);
return max(available, 0LL);
}
static inline u64 dev_buckets_reclaimable(struct bch_dev *ca)
{
return __dev_buckets_reclaimable(ca, bch2_dev_usage_read(ca));
}
/* Filesystem usage: */
static inline unsigned fs_usage_u64s(struct bch_fs *c)
{
return sizeof(struct bch_fs_usage) / sizeof(u64) +
READ_ONCE(c->replicas.nr);
}
static inline unsigned dev_usage_u64s(void)
{
return sizeof(struct bch_dev_usage) / sizeof(u64);
}
u64 bch2_fs_usage_read_one(struct bch_fs *, u64 *);
struct bch_fs_usage_online *bch2_fs_usage_read(struct bch_fs *);
void bch2_fs_usage_acc_to_base(struct bch_fs *, unsigned);
void bch2_fs_usage_to_text(struct printbuf *,
struct bch_fs *, struct bch_fs_usage_online *);
u64 bch2_fs_sectors_used(struct bch_fs *, struct bch_fs_usage_online *);
struct bch_fs_usage_short
bch2_fs_usage_read_short(struct bch_fs *);
/* key/bucket marking: */
void bch2_bucket_seq_cleanup(struct bch_fs *);
void bch2_fs_usage_initialize(struct bch_fs *);
void bch2_mark_alloc_bucket(struct bch_fs *, struct bch_dev *, size_t, bool);
void bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
size_t, enum bch_data_type, unsigned,
struct gc_pos, unsigned);
int bch2_mark_key(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
int bch2_mark_update(struct btree_trans *, struct btree_path *,
struct bkey_i *, unsigned);
int bch2_trans_mark_key(struct btree_trans *, struct bkey_s_c,
struct bkey_s_c, unsigned);
int bch2_trans_fs_usage_apply(struct btree_trans *, struct replicas_delta_list *);
int bch2_trans_mark_metadata_bucket(struct btree_trans *, struct bch_dev *,
size_t, enum bch_data_type, unsigned);
int bch2_trans_mark_dev_sb(struct bch_fs *, struct bch_dev *);
/* disk reservations: */
static inline void bch2_disk_reservation_put(struct bch_fs *c,
struct disk_reservation *res)
{
if (res->sectors) {
this_cpu_sub(*c->online_reserved, res->sectors);
res->sectors = 0;
}
}
#define BCH_DISK_RESERVATION_NOFAIL (1 << 0)
int __bch2_disk_reservation_add(struct bch_fs *,
struct disk_reservation *,
u64, int);
static inline int bch2_disk_reservation_add(struct bch_fs *c, struct disk_reservation *res,
u64 sectors, int flags)
{
u64 old, new;
do {
old = this_cpu_read(c->pcpu->sectors_available);
if (sectors > old)
return __bch2_disk_reservation_add(c, res, sectors, flags);
new = old - sectors;
} while (this_cpu_cmpxchg(c->pcpu->sectors_available, old, new) != old);
this_cpu_add(*c->online_reserved, sectors);
res->sectors += sectors;
return 0;
}
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,
u64 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);
}
#define RESERVE_FACTOR 6
static inline u64 avail_factor(u64 r)
{
return div_u64(r << RESERVE_FACTOR, (1 << RESERVE_FACTOR) + 1);
}
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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