diff options
Diffstat (limited to 'fs/bcachefs/alloc_background.h')
| -rw-r--r-- | fs/bcachefs/alloc_background.h | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/fs/bcachefs/alloc_background.h b/fs/bcachefs/alloc_background.h new file mode 100644 index 000000000000..163a67b97a40 --- /dev/null +++ b/fs/bcachefs/alloc_background.h @@ -0,0 +1,357 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_ALLOC_BACKGROUND_H +#define _BCACHEFS_ALLOC_BACKGROUND_H + +#include "bcachefs.h" +#include "alloc_types.h" +#include "buckets.h" +#include "debug.h" +#include "super.h" + +enum bch_validate_flags; + +/* How out of date a pointer gen is allowed to be: */ +#define BUCKET_GC_GEN_MAX 96U + +static inline bool bch2_dev_bucket_exists(struct bch_fs *c, struct bpos pos) +{ + rcu_read_lock(); + struct bch_dev *ca = bch2_dev_rcu_noerror(c, pos.inode); + bool ret = ca && bucket_valid(ca, pos.offset); + rcu_read_unlock(); + return ret; +} + +static inline u64 bucket_to_u64(struct bpos bucket) +{ + return (bucket.inode << 48) | bucket.offset; +} + +static inline struct bpos u64_to_bucket(u64 bucket) +{ + return POS(bucket >> 48, bucket & ~(~0ULL << 48)); +} + +static inline u8 alloc_gc_gen(struct bch_alloc_v4 a) +{ + return a.gen - a.oldest_gen; +} + +static inline void alloc_to_bucket(struct bucket *dst, struct bch_alloc_v4 src) +{ + dst->gen = src.gen; + dst->data_type = src.data_type; + dst->stripe_sectors = src.stripe_sectors; + dst->dirty_sectors = src.dirty_sectors; + dst->cached_sectors = src.cached_sectors; + dst->stripe = src.stripe; +} + +static inline void __bucket_m_to_alloc(struct bch_alloc_v4 *dst, struct bucket src) +{ + dst->gen = src.gen; + dst->data_type = src.data_type; + dst->stripe_sectors = src.stripe_sectors; + dst->dirty_sectors = src.dirty_sectors; + dst->cached_sectors = src.cached_sectors; + dst->stripe = src.stripe; +} + +static inline struct bch_alloc_v4 bucket_m_to_alloc(struct bucket b) +{ + struct bch_alloc_v4 ret = {}; + __bucket_m_to_alloc(&ret, b); + return ret; +} + +static inline enum bch_data_type bucket_data_type(enum bch_data_type data_type) +{ + switch (data_type) { + case BCH_DATA_cached: + case BCH_DATA_stripe: + return BCH_DATA_user; + default: + return data_type; + } +} + +static inline bool bucket_data_type_mismatch(enum bch_data_type bucket, + enum bch_data_type ptr) +{ + return !data_type_is_empty(bucket) && + bucket_data_type(bucket) != bucket_data_type(ptr); +} + +/* + * It is my general preference to use unsigned types for unsigned quantities - + * however, these helpers are used in disk accounting calculations run by + * triggers where the output will be negated and added to an s64. unsigned is + * right out even though all these quantities will fit in 32 bits, since it + * won't be sign extended correctly; u64 will negate "correctly", but s64 is the + * simpler option here. + */ +static inline s64 bch2_bucket_sectors_total(struct bch_alloc_v4 a) +{ + return a.stripe_sectors + a.dirty_sectors + a.cached_sectors; +} + +static inline s64 bch2_bucket_sectors_dirty(struct bch_alloc_v4 a) +{ + return a.stripe_sectors + a.dirty_sectors; +} + +static inline s64 bch2_bucket_sectors(struct bch_alloc_v4 a) +{ + return a.data_type == BCH_DATA_cached + ? a.cached_sectors + : bch2_bucket_sectors_dirty(a); +} + +static inline s64 bch2_bucket_sectors_fragmented(struct bch_dev *ca, + struct bch_alloc_v4 a) +{ + int d = bch2_bucket_sectors(a); + + return d ? max(0, ca->mi.bucket_size - d) : 0; +} + +static inline s64 bch2_gc_bucket_sectors_fragmented(struct bch_dev *ca, struct bucket a) +{ + int d = a.stripe_sectors + a.dirty_sectors; + + return d ? max(0, ca->mi.bucket_size - d) : 0; +} + +static inline s64 bch2_bucket_sectors_unstriped(struct bch_alloc_v4 a) +{ + return a.data_type == BCH_DATA_stripe ? a.dirty_sectors : 0; +} + +static inline enum bch_data_type alloc_data_type(struct bch_alloc_v4 a, + enum bch_data_type data_type) +{ + if (a.stripe) + return data_type == BCH_DATA_parity ? data_type : BCH_DATA_stripe; + if (bch2_bucket_sectors_dirty(a)) + return data_type; + if (a.cached_sectors) + return BCH_DATA_cached; + if (BCH_ALLOC_V4_NEED_DISCARD(&a)) + return BCH_DATA_need_discard; + if (alloc_gc_gen(a) >= BUCKET_GC_GEN_MAX) + return BCH_DATA_need_gc_gens; + return BCH_DATA_free; +} + +static inline void alloc_data_type_set(struct bch_alloc_v4 *a, enum bch_data_type data_type) +{ + a->data_type = alloc_data_type(*a, data_type); +} + +static inline u64 alloc_lru_idx_read(struct bch_alloc_v4 a) +{ + return a.data_type == BCH_DATA_cached + ? a.io_time[READ] & LRU_TIME_MAX + : 0; +} + +#define DATA_TYPES_MOVABLE \ + ((1U << BCH_DATA_btree)| \ + (1U << BCH_DATA_user)| \ + (1U << BCH_DATA_stripe)) + +static inline bool data_type_movable(enum bch_data_type type) +{ + return (1U << type) & DATA_TYPES_MOVABLE; +} + +static inline u64 alloc_lru_idx_fragmentation(struct bch_alloc_v4 a, + struct bch_dev *ca) +{ + if (a.data_type >= BCH_DATA_NR) + return 0; + + if (!data_type_movable(a.data_type) || + !bch2_bucket_sectors_fragmented(ca, a)) + return 0; + + /* + * avoid overflowing LRU_TIME_BITS on a corrupted fs, when + * bucket_sectors_dirty is (much) bigger than bucket_size + */ + u64 d = min_t(s64, bch2_bucket_sectors_dirty(a), + ca->mi.bucket_size); + + return div_u64(d * (1ULL << 31), ca->mi.bucket_size); +} + +static inline u64 alloc_freespace_genbits(struct bch_alloc_v4 a) +{ + return ((u64) alloc_gc_gen(a) >> 4) << 56; +} + +static inline struct bpos alloc_freespace_pos(struct bpos pos, struct bch_alloc_v4 a) +{ + pos.offset |= alloc_freespace_genbits(a); + return pos; +} + +static inline unsigned alloc_v4_u64s_noerror(const struct bch_alloc_v4 *a) +{ + return (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?: + BCH_ALLOC_V4_U64s_V0) + + BCH_ALLOC_V4_NR_BACKPOINTERS(a) * + (sizeof(struct bch_backpointer) / sizeof(u64)); +} + +static inline unsigned alloc_v4_u64s(const struct bch_alloc_v4 *a) +{ + unsigned ret = alloc_v4_u64s_noerror(a); + BUG_ON(ret > U8_MAX - BKEY_U64s); + return ret; +} + +static inline void set_alloc_v4_u64s(struct bkey_i_alloc_v4 *a) +{ + set_bkey_val_u64s(&a->k, alloc_v4_u64s(&a->v)); +} + +struct bkey_i_alloc_v4 * +bch2_trans_start_alloc_update_noupdate(struct btree_trans *, struct btree_iter *, struct bpos); +struct bkey_i_alloc_v4 * +bch2_trans_start_alloc_update(struct btree_trans *, struct bpos, + enum btree_iter_update_trigger_flags); + +void __bch2_alloc_to_v4(struct bkey_s_c, struct bch_alloc_v4 *); + +static inline const struct bch_alloc_v4 *bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *convert) +{ + const struct bch_alloc_v4 *ret; + + if (unlikely(k.k->type != KEY_TYPE_alloc_v4)) + goto slowpath; + + ret = bkey_s_c_to_alloc_v4(k).v; + if (BCH_ALLOC_V4_BACKPOINTERS_START(ret) != BCH_ALLOC_V4_U64s) + goto slowpath; + + return ret; +slowpath: + __bch2_alloc_to_v4(k, convert); + return convert; +} + +struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut(struct btree_trans *, struct bkey_s_c); + +int bch2_bucket_io_time_reset(struct btree_trans *, unsigned, size_t, int); + +int bch2_alloc_v1_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); +int bch2_alloc_v2_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); +int bch2_alloc_v3_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); +int bch2_alloc_v4_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); +void bch2_alloc_v4_swab(struct bkey_s); +void bch2_alloc_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); + +#define bch2_bkey_ops_alloc ((struct bkey_ops) { \ + .key_validate = bch2_alloc_v1_validate, \ + .val_to_text = bch2_alloc_to_text, \ + .trigger = bch2_trigger_alloc, \ + .min_val_size = 8, \ +}) + +#define bch2_bkey_ops_alloc_v2 ((struct bkey_ops) { \ + .key_validate = bch2_alloc_v2_validate, \ + .val_to_text = bch2_alloc_to_text, \ + .trigger = bch2_trigger_alloc, \ + .min_val_size = 8, \ +}) + +#define bch2_bkey_ops_alloc_v3 ((struct bkey_ops) { \ + .key_validate = bch2_alloc_v3_validate, \ + .val_to_text = bch2_alloc_to_text, \ + .trigger = bch2_trigger_alloc, \ + .min_val_size = 16, \ +}) + +#define bch2_bkey_ops_alloc_v4 ((struct bkey_ops) { \ + .key_validate = bch2_alloc_v4_validate, \ + .val_to_text = bch2_alloc_to_text, \ + .swab = bch2_alloc_v4_swab, \ + .trigger = bch2_trigger_alloc, \ + .min_val_size = 48, \ +}) + +int bch2_bucket_gens_validate(struct bch_fs *, struct bkey_s_c, + enum bch_validate_flags); +void bch2_bucket_gens_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); + +#define bch2_bkey_ops_bucket_gens ((struct bkey_ops) { \ + .key_validate = bch2_bucket_gens_validate, \ + .val_to_text = bch2_bucket_gens_to_text, \ +}) + +int bch2_bucket_gens_init(struct bch_fs *); + +static inline bool bkey_is_alloc(const struct bkey *k) +{ + return k->type == KEY_TYPE_alloc || + k->type == KEY_TYPE_alloc_v2 || + k->type == KEY_TYPE_alloc_v3; +} + +int bch2_alloc_read(struct bch_fs *); + +int bch2_alloc_key_to_dev_counters(struct btree_trans *, struct bch_dev *, + const struct bch_alloc_v4 *, + const struct bch_alloc_v4 *, unsigned); +int bch2_trigger_alloc(struct btree_trans *, enum btree_id, unsigned, + struct bkey_s_c, struct bkey_s, + enum btree_iter_update_trigger_flags); +int bch2_check_alloc_info(struct bch_fs *); +int bch2_check_alloc_to_lru_refs(struct bch_fs *); +void bch2_dev_do_discards(struct bch_dev *); +void bch2_do_discards(struct bch_fs *); + +static inline u64 should_invalidate_buckets(struct bch_dev *ca, + struct bch_dev_usage u) +{ + u64 want_free = ca->mi.nbuckets >> 7; + u64 free = max_t(s64, 0, + u.d[BCH_DATA_free].buckets + + u.d[BCH_DATA_need_discard].buckets + - bch2_dev_buckets_reserved(ca, BCH_WATERMARK_stripe)); + + return clamp_t(s64, want_free - free, 0, u.d[BCH_DATA_cached].buckets); +} + +void bch2_dev_do_invalidates(struct bch_dev *); +void bch2_do_invalidates(struct bch_fs *); + +static inline struct bch_backpointer *alloc_v4_backpointers(struct bch_alloc_v4 *a) +{ + return (void *) ((u64 *) &a->v + + (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?: + BCH_ALLOC_V4_U64s_V0)); +} + +static inline const struct bch_backpointer *alloc_v4_backpointers_c(const struct bch_alloc_v4 *a) +{ + return (void *) ((u64 *) &a->v + BCH_ALLOC_V4_BACKPOINTERS_START(a)); +} + +int bch2_dev_freespace_init(struct bch_fs *, struct bch_dev *, u64, u64); +int bch2_fs_freespace_init(struct bch_fs *); +int bch2_dev_remove_alloc(struct bch_fs *, struct bch_dev *); + +void bch2_recalc_capacity(struct bch_fs *); +u64 bch2_min_rw_member_capacity(struct bch_fs *); + +void bch2_dev_allocator_remove(struct bch_fs *, struct bch_dev *); +void bch2_dev_allocator_add(struct bch_fs *, struct bch_dev *); + +void bch2_dev_allocator_background_exit(struct bch_dev *); +void bch2_dev_allocator_background_init(struct bch_dev *); + +void bch2_fs_allocator_background_init(struct bch_fs *); + +#endif /* _BCACHEFS_ALLOC_BACKGROUND_H */ |