linux/fs/bcachefs/buckets.h

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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 "extents.h"
#include "super.h"
#define for_each_bucket(_b, _buckets) \
for (_b = (_buckets)->b + (_buckets)->first_bucket; \
_b < (_buckets)->b + (_buckets)->nbuckets; _b++)
static inline void bucket_unlock(struct bucket *b)
{
smp_store_release(&b->lock, 0);
}
static inline void bucket_lock(struct bucket *b)
{
while (xchg(&b->lock, 1))
cpu_relax();
}
static inline struct bucket_array *gc_bucket_array(struct bch_dev *ca)
{
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 *gc_bucket(struct bch_dev *ca, size_t b)
{
struct bucket_array *buckets = gc_bucket_array(ca);
BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
return buckets->b + b;
}
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;
}
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 bpos PTR_BUCKET_POS(const struct bch_fs *c,
const struct bch_extent_ptr *ptr)
{
struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
return POS(ptr->dev, PTR_BUCKET_NR(ca, ptr));
}
static inline struct bpos PTR_BUCKET_POS_OFFSET(const struct bch_fs *c,
const struct bch_extent_ptr *ptr,
u32 *bucket_offset)
{
struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
return POS(ptr->dev, sector_to_bucket_and_offset(ca, ptr->offset, bucket_offset));
}
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 (bkey_is_btree_ptr(k))
return BCH_DATA_btree;
return ptr->cached ? BCH_DATA_cached : BCH_DATA_user;
}
static inline s64 ptr_disk_sectors(s64 sectors, struct extent_ptr_decoded p)
{
EBUG_ON(sectors < 0);
return crc_is_compressed(p.crc)
? DIV_ROUND_UP_ULL(sectors * p.crc.compressed_size,
p.crc.uncompressed_size)
: sectors;
}
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;
}
/* Device usage: */
void bch2_dev_usage_read_fast(struct bch_dev *, struct bch_dev_usage *);
static inline struct bch_dev_usage bch2_dev_usage_read(struct bch_dev *ca)
{
struct bch_dev_usage ret;
bch2_dev_usage_read_fast(ca, &ret);
return ret;
}
void bch2_dev_usage_init(struct bch_dev *);
static inline u64 bch2_dev_buckets_reserved(struct bch_dev *ca, enum alloc_reserve reserve)
{
s64 reserved = 0;
switch (reserve) {
case RESERVE_none:
reserved += ca->mi.nbuckets >> 6;
fallthrough;
case RESERVE_movinggc:
reserved += ca->nr_btree_reserve;
fallthrough;
case RESERVE_btree:
reserved += ca->nr_btree_reserve;
fallthrough;
case RESERVE_btree_movinggc:
break;
}
return reserved;
}
static inline u64 dev_buckets_free(struct bch_dev *ca,
struct bch_dev_usage usage,
enum alloc_reserve reserve)
{
return max_t(s64, 0,
usage.d[BCH_DATA_free].buckets -
ca->nr_open_buckets -
bch2_dev_buckets_reserved(ca, reserve));
}
static inline u64 __dev_buckets_available(struct bch_dev *ca,
struct bch_dev_usage usage,
enum alloc_reserve reserve)
{
return max_t(s64, 0,
usage.d[BCH_DATA_free].buckets
+ usage.d[BCH_DATA_cached].buckets
+ usage.d[BCH_DATA_need_gc_gens].buckets
+ usage.d[BCH_DATA_need_discard].buckets
- ca->nr_open_buckets
- bch2_dev_buckets_reserved(ca, reserve));
}
static inline u64 dev_buckets_available(struct bch_dev *ca,
enum alloc_reserve reserve)
{
return __dev_buckets_available(ca, bch2_dev_usage_read(ca), reserve);
}
/* 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_fs_usage_initialize(struct bch_fs *);
int bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
size_t, enum bch_data_type, unsigned,
struct gc_pos, unsigned);
int bch2_mark_alloc(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
int bch2_mark_extent(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
int bch2_mark_stripe(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
int bch2_mark_inode(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
int bch2_mark_reservation(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
int bch2_mark_reflink_p(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
int bch2_trans_mark_extent(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
int bch2_trans_mark_stripe(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
int bch2_trans_mark_inode(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
int bch2_trans_mark_reservation(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
int bch2_trans_mark_reflink_p(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
void bch2_trans_fs_usage_revert(struct btree_trans *, struct replicas_delta_list *);
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)
{
#ifdef __KERNEL__
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;
#else
return __bch2_disk_reservation_add(c, res, sectors, flags);
#endif
}
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 */