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b0d3ab531f
gc_lock is now only for synchronization between check_alloc_info and interior btree updates - nothing else Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
426 lines
11 KiB
C
426 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Code for manipulating bucket marks for garbage collection.
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*
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* Copyright 2014 Datera, Inc.
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*/
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#ifndef _BUCKETS_H
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#define _BUCKETS_H
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#include "buckets_types.h"
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#include "extents.h"
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#include "sb-members.h"
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static inline u64 sector_to_bucket(const struct bch_dev *ca, sector_t s)
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{
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return div_u64(s, ca->mi.bucket_size);
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}
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static inline sector_t bucket_to_sector(const struct bch_dev *ca, size_t b)
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{
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return ((sector_t) b) * ca->mi.bucket_size;
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}
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static inline sector_t bucket_remainder(const struct bch_dev *ca, sector_t s)
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{
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u32 remainder;
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div_u64_rem(s, ca->mi.bucket_size, &remainder);
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return remainder;
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}
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static inline u64 sector_to_bucket_and_offset(const struct bch_dev *ca, sector_t s, u32 *offset)
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{
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return div_u64_rem(s, ca->mi.bucket_size, offset);
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}
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#define for_each_bucket(_b, _buckets) \
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for (_b = (_buckets)->b + (_buckets)->first_bucket; \
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_b < (_buckets)->b + (_buckets)->nbuckets; _b++)
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/*
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* Ugly hack alert:
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*
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* We need to cram a spinlock in a single byte, because that's what we have left
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* in struct bucket, and we care about the size of these - during fsck, we need
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* in memory state for every single bucket on every device.
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*
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* We used to do
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* while (xchg(&b->lock, 1) cpu_relax();
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* but, it turns out not all architectures support xchg on a single byte.
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*
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* So now we use bit_spin_lock(), with fun games since we can't burn a whole
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* ulong for this - we just need to make sure the lock bit always ends up in the
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* first byte.
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*/
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define BUCKET_LOCK_BITNR 0
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#else
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#define BUCKET_LOCK_BITNR (BITS_PER_LONG - 1)
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#endif
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union ulong_byte_assert {
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ulong ulong;
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u8 byte;
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};
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static inline void bucket_unlock(struct bucket *b)
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{
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BUILD_BUG_ON(!((union ulong_byte_assert) { .ulong = 1UL << BUCKET_LOCK_BITNR }).byte);
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clear_bit_unlock(BUCKET_LOCK_BITNR, (void *) &b->lock);
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wake_up_bit((void *) &b->lock, BUCKET_LOCK_BITNR);
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}
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static inline void bucket_lock(struct bucket *b)
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{
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wait_on_bit_lock((void *) &b->lock, BUCKET_LOCK_BITNR,
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TASK_UNINTERRUPTIBLE);
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}
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static inline struct bucket_array *gc_bucket_array(struct bch_dev *ca)
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{
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return rcu_dereference_check(ca->buckets_gc,
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!ca->fs ||
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percpu_rwsem_is_held(&ca->fs->mark_lock) ||
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lockdep_is_held(&ca->fs->state_lock) ||
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lockdep_is_held(&ca->bucket_lock));
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}
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static inline struct bucket *gc_bucket(struct bch_dev *ca, size_t b)
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{
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struct bucket_array *buckets = gc_bucket_array(ca);
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if (b - buckets->first_bucket >= buckets->nbuckets_minus_first)
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return NULL;
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return buckets->b + b;
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}
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static inline struct bucket_gens *bucket_gens(struct bch_dev *ca)
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{
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return rcu_dereference_check(ca->bucket_gens,
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!ca->fs ||
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percpu_rwsem_is_held(&ca->fs->mark_lock) ||
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lockdep_is_held(&ca->fs->state_lock) ||
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lockdep_is_held(&ca->bucket_lock));
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}
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static inline u8 *bucket_gen(struct bch_dev *ca, size_t b)
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{
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struct bucket_gens *gens = bucket_gens(ca);
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if (b - gens->first_bucket >= gens->nbuckets_minus_first)
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return NULL;
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return gens->b + b;
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}
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static inline u8 bucket_gen_get(struct bch_dev *ca, size_t b)
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{
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rcu_read_lock();
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u8 gen = *bucket_gen(ca, b);
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rcu_read_unlock();
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return gen;
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}
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static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
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const struct bch_extent_ptr *ptr)
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{
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return sector_to_bucket(ca, ptr->offset);
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}
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static inline struct bpos PTR_BUCKET_POS(const struct bch_dev *ca,
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const struct bch_extent_ptr *ptr)
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{
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return POS(ptr->dev, PTR_BUCKET_NR(ca, ptr));
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}
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static inline struct bpos PTR_BUCKET_POS_OFFSET(const struct bch_dev *ca,
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const struct bch_extent_ptr *ptr,
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u32 *bucket_offset)
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{
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return POS(ptr->dev, sector_to_bucket_and_offset(ca, ptr->offset, bucket_offset));
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}
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static inline struct bucket *PTR_GC_BUCKET(struct bch_dev *ca,
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const struct bch_extent_ptr *ptr)
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{
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return gc_bucket(ca, PTR_BUCKET_NR(ca, ptr));
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}
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static inline enum bch_data_type ptr_data_type(const struct bkey *k,
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const struct bch_extent_ptr *ptr)
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{
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if (bkey_is_btree_ptr(k))
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return BCH_DATA_btree;
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return ptr->cached ? BCH_DATA_cached : BCH_DATA_user;
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}
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static inline s64 ptr_disk_sectors(s64 sectors, struct extent_ptr_decoded p)
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{
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EBUG_ON(sectors < 0);
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return crc_is_compressed(p.crc)
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? DIV_ROUND_UP_ULL(sectors * p.crc.compressed_size,
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p.crc.uncompressed_size)
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: sectors;
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}
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static inline int gen_cmp(u8 a, u8 b)
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{
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return (s8) (a - b);
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}
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static inline int gen_after(u8 a, u8 b)
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{
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int r = gen_cmp(a, b);
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return r > 0 ? r : 0;
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}
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static inline int dev_ptr_stale_rcu(struct bch_dev *ca, const struct bch_extent_ptr *ptr)
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{
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u8 *gen = bucket_gen(ca, PTR_BUCKET_NR(ca, ptr));
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if (!gen)
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return -1;
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return gen_after(*gen, ptr->gen);
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}
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/**
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* dev_ptr_stale() - check if a pointer points into a bucket that has been
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* invalidated.
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*/
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static inline int dev_ptr_stale(struct bch_dev *ca, const struct bch_extent_ptr *ptr)
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{
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rcu_read_lock();
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int ret = dev_ptr_stale_rcu(ca, ptr);
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rcu_read_unlock();
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return ret;
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}
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/* Device usage: */
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void bch2_dev_usage_read_fast(struct bch_dev *, struct bch_dev_usage *);
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static inline struct bch_dev_usage bch2_dev_usage_read(struct bch_dev *ca)
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{
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struct bch_dev_usage ret;
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bch2_dev_usage_read_fast(ca, &ret);
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return ret;
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}
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void bch2_dev_usage_to_text(struct printbuf *, struct bch_dev_usage *);
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static inline u64 bch2_dev_buckets_reserved(struct bch_dev *ca, enum bch_watermark watermark)
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{
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s64 reserved = 0;
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switch (watermark) {
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case BCH_WATERMARK_NR:
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BUG();
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case BCH_WATERMARK_stripe:
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reserved += ca->mi.nbuckets >> 6;
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fallthrough;
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case BCH_WATERMARK_normal:
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reserved += ca->mi.nbuckets >> 6;
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fallthrough;
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case BCH_WATERMARK_copygc:
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reserved += ca->nr_btree_reserve;
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fallthrough;
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case BCH_WATERMARK_btree:
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reserved += ca->nr_btree_reserve;
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fallthrough;
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case BCH_WATERMARK_btree_copygc:
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case BCH_WATERMARK_reclaim:
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case BCH_WATERMARK_interior_updates:
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break;
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}
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return reserved;
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}
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static inline u64 dev_buckets_free(struct bch_dev *ca,
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struct bch_dev_usage usage,
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enum bch_watermark watermark)
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{
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return max_t(s64, 0,
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usage.d[BCH_DATA_free].buckets -
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ca->nr_open_buckets -
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bch2_dev_buckets_reserved(ca, watermark));
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}
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static inline u64 __dev_buckets_available(struct bch_dev *ca,
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struct bch_dev_usage usage,
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enum bch_watermark watermark)
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{
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return max_t(s64, 0,
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usage.d[BCH_DATA_free].buckets
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+ usage.d[BCH_DATA_cached].buckets
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+ usage.d[BCH_DATA_need_gc_gens].buckets
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+ usage.d[BCH_DATA_need_discard].buckets
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- ca->nr_open_buckets
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- bch2_dev_buckets_reserved(ca, watermark));
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}
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static inline u64 dev_buckets_available(struct bch_dev *ca,
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enum bch_watermark watermark)
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{
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return __dev_buckets_available(ca, bch2_dev_usage_read(ca), watermark);
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}
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/* Filesystem usage: */
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static inline unsigned dev_usage_u64s(void)
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{
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return sizeof(struct bch_dev_usage) / sizeof(u64);
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}
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struct bch_fs_usage_short
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bch2_fs_usage_read_short(struct bch_fs *);
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int bch2_bucket_ref_update(struct btree_trans *, struct bch_dev *,
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struct bkey_s_c, const struct bch_extent_ptr *,
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s64, enum bch_data_type, u8, u8, u32 *);
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int bch2_check_fix_ptrs(struct btree_trans *,
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enum btree_id, unsigned, struct bkey_s_c,
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enum btree_iter_update_trigger_flags);
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int bch2_trigger_extent(struct btree_trans *, enum btree_id, unsigned,
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struct bkey_s_c, struct bkey_s,
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enum btree_iter_update_trigger_flags);
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int bch2_trigger_reservation(struct btree_trans *, enum btree_id, unsigned,
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struct bkey_s_c, struct bkey_s,
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enum btree_iter_update_trigger_flags);
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#define trigger_run_overwrite_then_insert(_fn, _trans, _btree_id, _level, _old, _new, _flags)\
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({ \
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int ret = 0; \
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\
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if (_old.k->type) \
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ret = _fn(_trans, _btree_id, _level, _old, _flags & ~BTREE_TRIGGER_insert); \
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if (!ret && _new.k->type) \
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ret = _fn(_trans, _btree_id, _level, _new.s_c, _flags & ~BTREE_TRIGGER_overwrite);\
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ret; \
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})
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void bch2_trans_account_disk_usage_change(struct btree_trans *);
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int bch2_trans_mark_metadata_bucket(struct btree_trans *, struct bch_dev *, u64,
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enum bch_data_type, unsigned,
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enum btree_iter_update_trigger_flags);
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int bch2_trans_mark_dev_sb(struct bch_fs *, struct bch_dev *,
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enum btree_iter_update_trigger_flags);
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int bch2_trans_mark_dev_sbs_flags(struct bch_fs *,
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enum btree_iter_update_trigger_flags);
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int bch2_trans_mark_dev_sbs(struct bch_fs *);
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static inline bool is_superblock_bucket(struct bch_dev *ca, u64 b)
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{
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struct bch_sb_layout *layout = &ca->disk_sb.sb->layout;
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u64 b_offset = bucket_to_sector(ca, b);
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u64 b_end = bucket_to_sector(ca, b + 1);
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unsigned i;
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if (!b)
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return true;
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for (i = 0; i < layout->nr_superblocks; i++) {
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u64 offset = le64_to_cpu(layout->sb_offset[i]);
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u64 end = offset + (1 << layout->sb_max_size_bits);
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if (!(offset >= b_end || end <= b_offset))
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return true;
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}
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return false;
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}
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static inline const char *bch2_data_type_str(enum bch_data_type type)
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{
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return type < BCH_DATA_NR
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? __bch2_data_types[type]
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: "(invalid data type)";
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}
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/* disk reservations: */
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static inline void bch2_disk_reservation_put(struct bch_fs *c,
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struct disk_reservation *res)
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{
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if (res->sectors) {
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this_cpu_sub(*c->online_reserved, res->sectors);
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res->sectors = 0;
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}
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}
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#define BCH_DISK_RESERVATION_NOFAIL (1 << 0)
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int __bch2_disk_reservation_add(struct bch_fs *,
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struct disk_reservation *,
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u64, int);
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static inline int bch2_disk_reservation_add(struct bch_fs *c, struct disk_reservation *res,
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u64 sectors, int flags)
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{
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#ifdef __KERNEL__
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u64 old, new;
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old = this_cpu_read(c->pcpu->sectors_available);
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do {
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if (sectors > old)
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return __bch2_disk_reservation_add(c, res, sectors, flags);
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new = old - sectors;
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} while (!this_cpu_try_cmpxchg(c->pcpu->sectors_available, &old, new));
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this_cpu_add(*c->online_reserved, sectors);
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res->sectors += sectors;
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return 0;
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#else
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return __bch2_disk_reservation_add(c, res, sectors, flags);
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#endif
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}
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static inline struct disk_reservation
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bch2_disk_reservation_init(struct bch_fs *c, unsigned nr_replicas)
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{
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return (struct disk_reservation) {
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.sectors = 0,
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#if 0
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/* not used yet: */
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.gen = c->capacity_gen,
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#endif
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.nr_replicas = nr_replicas,
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};
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}
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static inline int bch2_disk_reservation_get(struct bch_fs *c,
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struct disk_reservation *res,
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u64 sectors, unsigned nr_replicas,
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int flags)
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{
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*res = bch2_disk_reservation_init(c, nr_replicas);
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return bch2_disk_reservation_add(c, res, sectors * nr_replicas, flags);
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}
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#define RESERVE_FACTOR 6
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static inline u64 avail_factor(u64 r)
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{
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return div_u64(r << RESERVE_FACTOR, (1 << RESERVE_FACTOR) + 1);
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}
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void bch2_buckets_nouse_free(struct bch_fs *);
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int bch2_buckets_nouse_alloc(struct bch_fs *);
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int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
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void bch2_dev_buckets_free(struct bch_dev *);
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int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);
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#endif /* _BUCKETS_H */
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