/* 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 "sb-members.h"
static inline u64 sector_to_bucket(const struct bch_dev *ca, sector_t s)
{
return div_u64(s, ca->mi.bucket_size);
}
static inline sector_t bucket_to_sector(const struct bch_dev *ca, size_t b)
{
return ((sector_t) b) * ca->mi.bucket_size;
}
static inline sector_t bucket_remainder(const struct bch_dev *ca, sector_t s)
{
u32 remainder;
div_u64_rem(s, ca->mi.bucket_size, &remainder);
return remainder;
}
static inline u64 sector_to_bucket_and_offset(const struct bch_dev *ca, sector_t s, u32 *offset)
{
return div_u64_rem(s, ca->mi.bucket_size, offset);
}
#define for_each_bucket(_b, _buckets) \
for (_b = (_buckets)->b + (_buckets)->first_bucket; \
_b < (_buckets)->b + (_buckets)->nbuckets; _b++)
/*
* Ugly hack alert:
*
* We need to cram a spinlock in a single byte, because that's what we have left
* in struct bucket, and we care about the size of these - during fsck, we need
* in memory state for every single bucket on every device.
*
* We used to do
* while (xchg(&b->lock, 1) cpu_relax();
* but, it turns out not all architectures support xchg on a single byte.
*
* So now we use bit_spin_lock(), with fun games since we can't burn a whole
* ulong for this - we just need to make sure the lock bit always ends up in the
* first byte.
*/
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define BUCKET_LOCK_BITNR 0
#else
#define BUCKET_LOCK_BITNR (BITS_PER_LONG - 1)
#endif
union ulong_byte_assert {
ulong ulong;
u8 byte;
};
static inline void bucket_unlock(struct bucket *b)
{
BUILD_BUG_ON(!((union ulong_byte_assert) { .ulong = 1UL << BUCKET_LOCK_BITNR }).byte);
clear_bit_unlock(BUCKET_LOCK_BITNR, (void *) &b->lock);
wake_up_bit((void *) &b->lock, BUCKET_LOCK_BITNR);
}
static inline void bucket_lock(struct bucket *b)
{
wait_on_bit_lock((void *) &b->lock, BUCKET_LOCK_BITNR,
TASK_UNINTERRUPTIBLE);
}
static inline struct bucket *gc_bucket(struct bch_dev *ca, size_t b)
{
return genradix_ptr(&ca->buckets_gc, 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->state_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);
if (b - gens->first_bucket >= gens->nbuckets_minus_first)
return NULL;
return gens->b + b;
}
static inline u8 bucket_gen_get(struct bch_dev *ca, size_t b)
{
rcu_read_lock();
u8 gen = *bucket_gen(ca, b);
rcu_read_unlock();
return 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 bpos PTR_BUCKET_POS(const struct bch_dev *ca,
const struct bch_extent_ptr *ptr)
{
return POS(ptr->dev, PTR_BUCKET_NR(ca, ptr));
}
static inline struct bpos PTR_BUCKET_POS_OFFSET(const struct bch_dev *ca,
const struct bch_extent_ptr *ptr,
u32 *bucket_offset)
{
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;
}
static inline int dev_ptr_stale_rcu(struct bch_dev *ca, const struct bch_extent_ptr *ptr)
{
u8 *gen = bucket_gen(ca, PTR_BUCKET_NR(ca, ptr));
if (!gen)
return -1;
return gen_after(*gen, ptr->gen);
}
/**
* dev_ptr_stale() - check if a pointer points into a bucket that has been
* invalidated.
*/
static inline int dev_ptr_stale(struct bch_dev *ca, const struct bch_extent_ptr *ptr)
{
rcu_read_lock();
int ret = dev_ptr_stale_rcu(ca, ptr);
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_to_text(struct printbuf *, struct bch_dev *, struct bch_dev_usage *);
static inline u64 bch2_dev_buckets_reserved(struct bch_dev *ca, enum bch_watermark watermark)
{
s64 reserved = 0;
switch (watermark) {
case BCH_WATERMARK_NR:
BUG();
case BCH_WATERMARK_stripe:
reserved += ca->mi.nbuckets >> 6;
fallthrough;
case BCH_WATERMARK_normal:
reserved += ca->mi.nbuckets >> 6;
fallthrough;
case BCH_WATERMARK_copygc:
reserved += ca->nr_btree_reserve;
fallthrough;
case BCH_WATERMARK_btree:
reserved += ca->nr_btree_reserve;
fallthrough;
case BCH_WATERMARK_btree_copygc:
case BCH_WATERMARK_reclaim:
case BCH_WATERMARK_interior_updates:
break;
}
return reserved;
}
static inline u64 dev_buckets_free(struct bch_dev *ca,
struct bch_dev_usage usage,
enum bch_watermark watermark)
{
return max_t(s64, 0,
usage.d[BCH_DATA_free].buckets -
ca->nr_open_buckets -
bch2_dev_buckets_reserved(ca, watermark));
}
static inline u64 __dev_buckets_available(struct bch_dev *ca,
struct bch_dev_usage usage,
enum bch_watermark watermark)
{
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, watermark));
}
static inline u64 dev_buckets_available(struct bch_dev *ca,
enum bch_watermark watermark)
{
return __dev_buckets_available(ca, bch2_dev_usage_read(ca), watermark);
}
/* Filesystem usage: */
static inline unsigned dev_usage_u64s(void)
{
return sizeof(struct bch_dev_usage) / sizeof(u64);
}
struct bch_fs_usage_short
bch2_fs_usage_read_short(struct bch_fs *);
int bch2_bucket_ref_update(struct btree_trans *, struct bch_dev *,
struct bkey_s_c, const struct bch_extent_ptr *,
s64, enum bch_data_type, u8, u8, u32 *);
int bch2_check_fix_ptrs(struct btree_trans *,
enum btree_id, unsigned, struct bkey_s_c,
enum btree_iter_update_trigger_flags);
int bch2_trigger_extent(struct btree_trans *, enum btree_id, unsigned,
struct bkey_s_c, struct bkey_s,
enum btree_iter_update_trigger_flags);
int bch2_trigger_reservation(struct btree_trans *, enum btree_id, unsigned,
struct bkey_s_c, struct bkey_s,
enum btree_iter_update_trigger_flags);
#define trigger_run_overwrite_then_insert(_fn, _trans, _btree_id, _level, _old, _new, _flags)\
({ \
int ret = 0; \
\
if (_old.k->type) \
ret = _fn(_trans, _btree_id, _level, _old, _flags & ~BTREE_TRIGGER_insert); \
if (!ret && _new.k->type) \
ret = _fn(_trans, _btree_id, _level, _new.s_c, _flags & ~BTREE_TRIGGER_overwrite);\
ret; \
})
void bch2_trans_account_disk_usage_change(struct btree_trans *);
int bch2_trans_mark_metadata_bucket(struct btree_trans *, struct bch_dev *, u64,
enum bch_data_type, unsigned,
enum btree_iter_update_trigger_flags);
int bch2_trans_mark_dev_sb(struct bch_fs *, struct bch_dev *,
enum btree_iter_update_trigger_flags);
int bch2_trans_mark_dev_sbs_flags(struct bch_fs *,
enum btree_iter_update_trigger_flags);
int bch2_trans_mark_dev_sbs(struct bch_fs *);
static inline bool is_superblock_bucket(struct bch_dev *ca, u64 b)
{
struct bch_sb_layout *layout = &ca->disk_sb.sb->layout;
u64 b_offset = bucket_to_sector(ca, b);
u64 b_end = bucket_to_sector(ca, b + 1);
unsigned i;
if (!b)
return true;
for (i = 0; i < layout->nr_superblocks; i++) {
u64 offset = le64_to_cpu(layout->sb_offset[i]);
u64 end = offset + (1 << layout->sb_max_size_bits);
if (!(offset >= b_end || end <= b_offset))
return true;
}
return false;
}
static inline const char *bch2_data_type_str(enum bch_data_type type)
{
return type < BCH_DATA_NR
? __bch2_data_types[type]
: "(invalid data type)";
}
/* 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;
old = this_cpu_read(c->pcpu->sectors_available);
do {
if (sectors > old)
return __bch2_disk_reservation_add(c, res, sectors, flags);
new = old - sectors;
} while (!this_cpu_try_cmpxchg(c->pcpu->sectors_available, &old, new));
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);
}
void bch2_buckets_nouse_free(struct bch_fs *);
int bch2_buckets_nouse_alloc(struct bch_fs *);
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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