+++ /dev/null
-/* 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 size_t 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 size_t 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_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 *);
-void bch2_dev_usage_to_text(struct printbuf *, 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:
- 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 __fs_usage_u64s(unsigned nr_replicas)
-{
- return sizeof(struct bch_fs_usage) / sizeof(u64) + nr_replicas;
-}
-
-static inline unsigned fs_usage_u64s(struct bch_fs *c)
-{
- return __fs_usage_u64s(READ_ONCE(c->replicas.nr));
-}
-
-static inline unsigned __fs_usage_online_u64s(unsigned nr_replicas)
-{
- return sizeof(struct bch_fs_usage_online) / sizeof(u64) + nr_replicas;
-}
-
-static inline unsigned fs_usage_online_u64s(struct bch_fs *c)
-{
- return __fs_usage_online_u64s(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 *);
-
-void bch2_dev_usage_update(struct bch_fs *, struct bch_dev *,
- const struct bch_alloc_v4 *,
- const struct bch_alloc_v4 *, u64, bool);
-void bch2_dev_usage_update_m(struct bch_fs *, struct bch_dev *,
- struct bucket *, struct bucket *);
-
-/* key/bucket marking: */
-
-static inline struct bch_fs_usage *fs_usage_ptr(struct bch_fs *c,
- unsigned journal_seq,
- bool gc)
-{
- percpu_rwsem_assert_held(&c->mark_lock);
- BUG_ON(!gc && !journal_seq);
-
- return this_cpu_ptr(gc
- ? c->usage_gc
- : c->usage[journal_seq & JOURNAL_BUF_MASK]);
-}
-
-int bch2_update_replicas(struct bch_fs *, struct bkey_s_c,
- struct bch_replicas_entry_v1 *, s64,
- unsigned, bool);
-int bch2_update_replicas_list(struct btree_trans *,
- struct bch_replicas_entry_v1 *, s64);
-int bch2_update_cached_sectors_list(struct btree_trans *, unsigned, s64);
-int bch2_replicas_deltas_realloc(struct btree_trans *, unsigned);
-
-void bch2_fs_usage_initialize(struct bch_fs *);
-
-int bch2_check_bucket_ref(struct btree_trans *, struct bkey_s_c,
- const struct bch_extent_ptr *,
- s64, enum bch_data_type, u8, u8, u32);
-
-int bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
- size_t, enum bch_data_type, unsigned,
- struct gc_pos, unsigned);
-
-int bch2_trigger_extent(struct btree_trans *, enum btree_id, unsigned,
- struct bkey_s_c, struct bkey_s, unsigned);
-int bch2_trigger_reservation(struct btree_trans *, enum btree_id, unsigned,
- struct bkey_s_c, struct bkey_s, unsigned);
-
-#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_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 *);
-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;
-}
-
-/* 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 */
projects / bcachefs-tools-debian / blobdiff