2 * Code for manipulating bucket marks for garbage collection.
4 * Copyright 2014 Datera, Inc.
10 #include "buckets_types.h"
13 #define for_each_bucket(_b, _buckets) \
14 for (_b = (_buckets)->b + (_buckets)->first_bucket; \
15 _b < (_buckets)->b + (_buckets)->nbuckets; _b++)
17 #define bucket_cmpxchg(g, new, expr) \
19 u64 _v = atomic64_read(&(g)->_mark.v); \
20 struct bucket_mark _old; \
23 (new).v.counter = _old.v.counter = _v; \
25 } while ((_v = atomic64_cmpxchg(&(g)->_mark.v, \
27 (new).v.counter)) != _old.v.counter);\
31 static inline struct bucket_array *__bucket_array(struct bch_dev *ca,
34 return rcu_dereference_check(ca->buckets[gc],
36 percpu_rwsem_is_held(&ca->fs->usage_lock) ||
37 lockdep_is_held(&ca->fs->gc_lock) ||
38 lockdep_is_held(&ca->bucket_lock));
41 static inline struct bucket_array *bucket_array(struct bch_dev *ca)
43 return __bucket_array(ca, false);
46 static inline struct bucket *__bucket(struct bch_dev *ca, size_t b, bool gc)
48 struct bucket_array *buckets = __bucket_array(ca, gc);
50 BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
51 return buckets->b + b;
54 static inline struct bucket *bucket(struct bch_dev *ca, size_t b)
56 return __bucket(ca, b, false);
59 static inline void bucket_io_clock_reset(struct bch_fs *c, struct bch_dev *ca,
62 bucket(ca, b)->io_time[rw] = c->bucket_clock[rw].hand;
65 static inline u16 bucket_last_io(struct bch_fs *c, struct bucket *g, int rw)
67 return c->bucket_clock[rw].hand - g->io_time[rw];
71 * bucket_gc_gen() returns the difference between the bucket's current gen and
72 * the oldest gen of any pointer into that bucket in the btree.
75 static inline u8 bucket_gc_gen(struct bch_dev *ca, size_t b)
77 return bucket(ca, b)->mark.gen - ca->oldest_gens[b];
80 static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
81 const struct bch_extent_ptr *ptr)
83 return sector_to_bucket(ca, ptr->offset);
86 static inline struct bucket *PTR_BUCKET(struct bch_dev *ca,
87 const struct bch_extent_ptr *ptr)
89 return bucket(ca, PTR_BUCKET_NR(ca, ptr));
92 static inline struct bucket_mark ptr_bucket_mark(struct bch_dev *ca,
93 const struct bch_extent_ptr *ptr)
98 m = READ_ONCE(bucket(ca, PTR_BUCKET_NR(ca, ptr))->mark);
104 static inline int gen_cmp(u8 a, u8 b)
109 static inline int gen_after(u8 a, u8 b)
111 int r = gen_cmp(a, b);
113 return r > 0 ? r : 0;
117 * ptr_stale() - check if a pointer points into a bucket that has been
120 static inline u8 ptr_stale(struct bch_dev *ca,
121 const struct bch_extent_ptr *ptr)
123 return gen_after(ptr_bucket_mark(ca, ptr).gen, ptr->gen);
126 /* bucket gc marks */
128 static inline unsigned bucket_sectors_used(struct bucket_mark mark)
130 return mark.dirty_sectors + mark.cached_sectors;
133 static inline bool bucket_unused(struct bucket_mark mark)
135 return !mark.owned_by_allocator &&
137 !bucket_sectors_used(mark);
142 struct bch_dev_usage __bch2_dev_usage_read(struct bch_dev *, bool);
143 struct bch_dev_usage bch2_dev_usage_read(struct bch_fs *, struct bch_dev *);
145 static inline u64 __dev_buckets_available(struct bch_dev *ca,
146 struct bch_dev_usage stats)
148 u64 total = ca->mi.nbuckets - ca->mi.first_bucket;
150 if (WARN_ONCE(stats.buckets_unavailable > total,
151 "buckets_unavailable overflow (%llu > %llu)\n",
152 stats.buckets_unavailable, total))
155 return total - stats.buckets_unavailable;
159 * Number of reclaimable buckets - only for use by the allocator thread:
161 static inline u64 dev_buckets_available(struct bch_fs *c, struct bch_dev *ca)
163 return __dev_buckets_available(ca, bch2_dev_usage_read(c, ca));
166 static inline u64 __dev_buckets_free(struct bch_dev *ca,
167 struct bch_dev_usage stats)
169 return __dev_buckets_available(ca, stats) +
170 fifo_used(&ca->free[RESERVE_NONE]) +
171 fifo_used(&ca->free_inc);
174 static inline u64 dev_buckets_free(struct bch_fs *c, struct bch_dev *ca)
176 return __dev_buckets_free(ca, bch2_dev_usage_read(c, ca));
179 /* Filesystem usage: */
181 struct bch_fs_usage __bch2_fs_usage_read(struct bch_fs *, bool);
182 struct bch_fs_usage bch2_fs_usage_read(struct bch_fs *);
183 void bch2_fs_usage_apply(struct bch_fs *, struct bch_fs_usage *,
184 struct disk_reservation *, struct gc_pos);
186 u64 bch2_fs_sectors_used(struct bch_fs *, struct bch_fs_usage);
188 static inline u64 bch2_fs_sectors_free(struct bch_fs *c,
189 struct bch_fs_usage stats)
191 return c->capacity - bch2_fs_sectors_used(c, stats);
194 static inline bool is_available_bucket(struct bucket_mark mark)
196 return (!mark.owned_by_allocator &&
197 !mark.dirty_sectors &&
202 static inline bool bucket_needs_journal_commit(struct bucket_mark m,
205 return m.journal_seq_valid &&
206 ((s16) m.journal_seq - (s16) last_seq_ondisk > 0);
209 void bch2_bucket_seq_cleanup(struct bch_fs *);
211 void bch2_invalidate_bucket(struct bch_fs *, struct bch_dev *,
212 size_t, struct bucket_mark *);
213 void bch2_mark_alloc_bucket(struct bch_fs *, struct bch_dev *,
214 size_t, bool, struct gc_pos, unsigned);
215 void bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
216 size_t, enum bch_data_type, unsigned,
217 struct gc_pos, unsigned);
219 #define BCH_BUCKET_MARK_NOATOMIC (1 << 0)
220 #define BCH_BUCKET_MARK_GC (1 << 1)
222 int bch2_mark_key_locked(struct bch_fs *, struct bkey_s_c,
223 bool, s64, struct gc_pos,
224 struct bch_fs_usage *, u64, unsigned);
225 int bch2_mark_key(struct bch_fs *, struct bkey_s_c,
226 bool, s64, struct gc_pos,
227 struct bch_fs_usage *, u64, unsigned);
228 void bch2_mark_update(struct btree_insert *, struct btree_insert_entry *);
230 void __bch2_disk_reservation_put(struct bch_fs *, struct disk_reservation *);
232 static inline void bch2_disk_reservation_put(struct bch_fs *c,
233 struct disk_reservation *res)
236 __bch2_disk_reservation_put(c, res);
239 #define BCH_DISK_RESERVATION_NOFAIL (1 << 0)
240 #define BCH_DISK_RESERVATION_GC_LOCK_HELD (1 << 1)
241 #define BCH_DISK_RESERVATION_BTREE_LOCKS_HELD (1 << 2)
243 int bch2_disk_reservation_add(struct bch_fs *,
244 struct disk_reservation *,
247 static inline struct disk_reservation
248 bch2_disk_reservation_init(struct bch_fs *c, unsigned nr_replicas)
250 return (struct disk_reservation) {
254 .gen = c->capacity_gen,
256 .nr_replicas = nr_replicas,
260 static inline int bch2_disk_reservation_get(struct bch_fs *c,
261 struct disk_reservation *res,
263 unsigned nr_replicas,
266 *res = bch2_disk_reservation_init(c, nr_replicas);
268 return bch2_disk_reservation_add(c, res, sectors * nr_replicas, flags);
271 int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
272 void bch2_dev_buckets_free(struct bch_dev *);
273 int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);
275 #endif /* _BUCKETS_H */