git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/buckets.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Code for manipulating bucket marks for garbage collection.
   4  *
   5  * Copyright 2014 Datera, Inc.
   6  */
   7
   8 #ifndef _BUCKETS_H
   9 #define _BUCKETS_H
  10
  11 #include "buckets_types.h"
  12 #include "extents.h"
  13 #include "super.h"
  14
  15 #define for_each_bucket(_b, _buckets)                           \
  16         for (_b = (_buckets)->b + (_buckets)->first_bucket;     \
  17              _b < (_buckets)->b + (_buckets)->nbuckets; _b++)
  18
  19 static inline void bucket_unlock(struct bucket *b)
  20 {
  21         smp_store_release(&b->lock, 0);
  22 }
  23
  24 static inline void bucket_lock(struct bucket *b)
  25 {
  26         while (xchg(&b->lock, 1))
  27                 cpu_relax();
  28 }
  29
  30 static inline struct bucket_array *gc_bucket_array(struct bch_dev *ca)
  31 {
  32         return rcu_dereference_check(ca->buckets_gc,
  33                                      !ca->fs ||
  34                                      percpu_rwsem_is_held(&ca->fs->mark_lock) ||
  35                                      lockdep_is_held(&ca->fs->gc_lock) ||
  36                                      lockdep_is_held(&ca->bucket_lock));
  37 }
  38
  39 static inline struct bucket *gc_bucket(struct bch_dev *ca, size_t b)
  40 {
  41         struct bucket_array *buckets = gc_bucket_array(ca);
  42
  43         BUG_ON(b < buckets->first_bucket || b >= buckets->nbuckets);
  44         return buckets->b + b;
  45 }
  46
  47 static inline struct bucket_gens *bucket_gens(struct bch_dev *ca)
  48 {
  49         return rcu_dereference_check(ca->bucket_gens,
  50                                      !ca->fs ||
  51                                      percpu_rwsem_is_held(&ca->fs->mark_lock) ||
  52                                      lockdep_is_held(&ca->fs->gc_lock) ||
  53                                      lockdep_is_held(&ca->bucket_lock));
  54 }
  55
  56 static inline u8 *bucket_gen(struct bch_dev *ca, size_t b)
  57 {
  58         struct bucket_gens *gens = bucket_gens(ca);
  59
  60         BUG_ON(b < gens->first_bucket || b >= gens->nbuckets);
  61         return gens->b + b;
  62 }
  63
  64 static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
  65                                    const struct bch_extent_ptr *ptr)
  66 {
  67         return sector_to_bucket(ca, ptr->offset);
  68 }
  69
  70 static inline struct bpos PTR_BUCKET_POS(const struct bch_fs *c,
  71                                    const struct bch_extent_ptr *ptr)
  72 {
  73         struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
  74
  75         return POS(ptr->dev, PTR_BUCKET_NR(ca, ptr));
  76 }
  77
  78 static inline struct bucket *PTR_GC_BUCKET(struct bch_dev *ca,
  79                                            const struct bch_extent_ptr *ptr)
  80 {
  81         return gc_bucket(ca, PTR_BUCKET_NR(ca, ptr));
  82 }
  83
  84 static inline enum bch_data_type ptr_data_type(const struct bkey *k,
  85                                                const struct bch_extent_ptr *ptr)
  86 {
  87         if (bkey_is_btree_ptr(k))
  88                 return BCH_DATA_btree;
  89
  90         return ptr->cached ? BCH_DATA_cached : BCH_DATA_user;
  91 }
  92
  93 static inline int gen_cmp(u8 a, u8 b)
  94 {
  95         return (s8) (a - b);
  96 }
  97
  98 static inline int gen_after(u8 a, u8 b)
  99 {
 100         int r = gen_cmp(a, b);
 101
 102         return r > 0 ? r : 0;
 103 }
 104
 105 /**
 106  * ptr_stale() - check if a pointer points into a bucket that has been
 107  * invalidated.
 108  */
 109 static inline u8 ptr_stale(struct bch_dev *ca,
 110                            const struct bch_extent_ptr *ptr)
 111 {
 112         u8 ret;
 113
 114         rcu_read_lock();
 115         ret = gen_after(*bucket_gen(ca, PTR_BUCKET_NR(ca, ptr)), ptr->gen);
 116         rcu_read_unlock();
 117
 118         return ret;
 119 }
 120
 121 /* Device usage: */
 122
 123 struct bch_dev_usage bch2_dev_usage_read(struct bch_dev *);
 124 void bch2_dev_usage_init(struct bch_dev *);
 125
 126 static inline u64 bch2_dev_buckets_reserved(struct bch_dev *ca, enum alloc_reserve reserve)
 127 {
 128         s64 reserved = 0;
 129
 130         switch (reserve) {
 131         case RESERVE_none:
 132                 reserved += ca->mi.nbuckets >> 6;
 133                 fallthrough;
 134         case RESERVE_movinggc:
 135                 reserved += ca->nr_btree_reserve;
 136                 fallthrough;
 137         case RESERVE_btree:
 138                 reserved += ca->nr_btree_reserve;
 139                 fallthrough;
 140         case RESERVE_btree_movinggc:
 141                 break;
 142         }
 143
 144         return reserved;
 145 }
 146
 147 static inline u64 __dev_buckets_available(struct bch_dev *ca,
 148                                           struct bch_dev_usage usage,
 149                                           enum alloc_reserve reserve)
 150 {
 151         return max_t(s64, 0,
 152                      usage.d[BCH_DATA_free].buckets -
 153                      ca->nr_open_buckets -
 154                      bch2_dev_buckets_reserved(ca, reserve));
 155 }
 156
 157 static inline u64 dev_buckets_available(struct bch_dev *ca,
 158                                         enum alloc_reserve reserve)
 159 {
 160         return __dev_buckets_available(ca, bch2_dev_usage_read(ca), reserve);
 161 }
 162
 163 /* Filesystem usage: */
 164
 165 static inline unsigned fs_usage_u64s(struct bch_fs *c)
 166 {
 167         return sizeof(struct bch_fs_usage) / sizeof(u64) +
 168                 READ_ONCE(c->replicas.nr);
 169 }
 170
 171 static inline unsigned dev_usage_u64s(void)
 172 {
 173         return sizeof(struct bch_dev_usage) / sizeof(u64);
 174 }
 175
 176 u64 bch2_fs_usage_read_one(struct bch_fs *, u64 *);
 177
 178 struct bch_fs_usage_online *bch2_fs_usage_read(struct bch_fs *);
 179
 180 void bch2_fs_usage_acc_to_base(struct bch_fs *, unsigned);
 181
 182 void bch2_fs_usage_to_text(struct printbuf *,
 183                            struct bch_fs *, struct bch_fs_usage_online *);
 184
 185 u64 bch2_fs_sectors_used(struct bch_fs *, struct bch_fs_usage_online *);
 186
 187 struct bch_fs_usage_short
 188 bch2_fs_usage_read_short(struct bch_fs *);
 189
 190 /* key/bucket marking: */
 191
 192 void bch2_fs_usage_initialize(struct bch_fs *);
 193
 194 int bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
 195                               size_t, enum bch_data_type, unsigned,
 196                               struct gc_pos, unsigned);
 197
 198 int bch2_mark_alloc(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
 199 int bch2_mark_extent(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
 200 int bch2_mark_stripe(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
 201 int bch2_mark_inode(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
 202 int bch2_mark_reservation(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
 203 int bch2_mark_reflink_p(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
 204
 205 int bch2_trans_mark_extent(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
 206 int bch2_trans_mark_stripe(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
 207 int bch2_trans_mark_inode(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
 208 int bch2_trans_mark_reservation(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
 209 int bch2_trans_mark_reflink_p(struct btree_trans *, enum btree_id, unsigned, struct bkey_s_c, struct bkey_i *, unsigned);
 210
 211 int bch2_mark_key(struct btree_trans *, struct bkey_s_c, struct bkey_s_c, unsigned);
 212
 213 int bch2_trans_fs_usage_apply(struct btree_trans *, struct replicas_delta_list *);
 214
 215 int bch2_trans_mark_metadata_bucket(struct btree_trans *, struct bch_dev *,
 216                                     size_t, enum bch_data_type, unsigned);
 217 int bch2_trans_mark_dev_sb(struct bch_fs *, struct bch_dev *);
 218
 219 /* disk reservations: */
 220
 221 static inline void bch2_disk_reservation_put(struct bch_fs *c,
 222                                              struct disk_reservation *res)
 223 {
 224         this_cpu_sub(*c->online_reserved, res->sectors);
 225         res->sectors = 0;
 226 }
 227
 228 #define BCH_DISK_RESERVATION_NOFAIL             (1 << 0)
 229
 230 int bch2_disk_reservation_add(struct bch_fs *,
 231                               struct disk_reservation *,
 232                               u64, int);
 233
 234 static inline struct disk_reservation
 235 bch2_disk_reservation_init(struct bch_fs *c, unsigned nr_replicas)
 236 {
 237         return (struct disk_reservation) {
 238                 .sectors        = 0,
 239 #if 0
 240                 /* not used yet: */
 241                 .gen            = c->capacity_gen,
 242 #endif
 243                 .nr_replicas    = nr_replicas,
 244         };
 245 }
 246
 247 static inline int bch2_disk_reservation_get(struct bch_fs *c,
 248                                             struct disk_reservation *res,
 249                                             u64 sectors, unsigned nr_replicas,
 250                                             int flags)
 251 {
 252         *res = bch2_disk_reservation_init(c, nr_replicas);
 253
 254         return bch2_disk_reservation_add(c, res, sectors * nr_replicas, flags);
 255 }
 256
 257 #define RESERVE_FACTOR  6
 258
 259 static inline u64 avail_factor(u64 r)
 260 {
 261         return div_u64(r << RESERVE_FACTOR, (1 << RESERVE_FACTOR) + 1);
 262 }
 263
 264 int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
 265 void bch2_dev_buckets_free(struct bch_dev *);
 266 int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);
 267
 268 #endif /* _BUCKETS_H */