1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _BCACHEFS_ALLOC_BACKGROUND_H 3 #define _BCACHEFS_ALLOC_BACKGROUND_H 4 5 #include "bcachefs.h" 6 #include "alloc_types.h" 7 #include "buckets.h" 8 #include "debug.h" 9 #include "super.h" 10 11 enum bch_validate_flags; 12 13 /* How out of date a pointer gen is allowed to be: */ 14 #define BUCKET_GC_GEN_MAX 96U 15 16 static inline bool bch2_dev_bucket_exists(struct bch_fs *c, struct bpos pos) 17 { 18 rcu_read_lock(); 19 struct bch_dev *ca = bch2_dev_rcu(c, pos.inode); 20 bool ret = ca && bucket_valid(ca, pos.offset); 21 rcu_read_unlock(); 22 return ret; 23 } 24 25 static inline u64 bucket_to_u64(struct bpos bucket) 26 { 27 return (bucket.inode << 48) | bucket.offset; 28 } 29 30 static inline struct bpos u64_to_bucket(u64 bucket) 31 { 32 return POS(bucket >> 48, bucket & ~(~0ULL << 48)); 33 } 34 35 static inline u8 alloc_gc_gen(struct bch_alloc_v4 a) 36 { 37 return a.gen - a.oldest_gen; 38 } 39 40 static inline void alloc_to_bucket(struct bucket *dst, struct bch_alloc_v4 src) 41 { 42 dst->gen = src.gen; 43 dst->data_type = src.data_type; 44 dst->stripe_sectors = src.stripe_sectors; 45 dst->dirty_sectors = src.dirty_sectors; 46 dst->cached_sectors = src.cached_sectors; 47 dst->stripe = src.stripe; 48 } 49 50 static inline void __bucket_m_to_alloc(struct bch_alloc_v4 *dst, struct bucket src) 51 { 52 dst->gen = src.gen; 53 dst->data_type = src.data_type; 54 dst->stripe_sectors = src.stripe_sectors; 55 dst->dirty_sectors = src.dirty_sectors; 56 dst->cached_sectors = src.cached_sectors; 57 dst->stripe = src.stripe; 58 } 59 60 static inline struct bch_alloc_v4 bucket_m_to_alloc(struct bucket b) 61 { 62 struct bch_alloc_v4 ret = {}; 63 __bucket_m_to_alloc(&ret, b); 64 return ret; 65 } 66 67 static inline enum bch_data_type bucket_data_type(enum bch_data_type data_type) 68 { 69 switch (data_type) { 70 case BCH_DATA_cached: 71 case BCH_DATA_stripe: 72 return BCH_DATA_user; 73 default: 74 return data_type; 75 } 76 } 77 78 static inline bool bucket_data_type_mismatch(enum bch_data_type bucket, 79 enum bch_data_type ptr) 80 { 81 return !data_type_is_empty(bucket) && 82 bucket_data_type(bucket) != bucket_data_type(ptr); 83 } 84 85 /* 86 * It is my general preference to use unsigned types for unsigned quantities - 87 * however, these helpers are used in disk accounting calculations run by 88 * triggers where the output will be negated and added to an s64. unsigned is 89 * right out even though all these quantities will fit in 32 bits, since it 90 * won't be sign extended correctly; u64 will negate "correctly", but s64 is the 91 * simpler option here. 92 */ 93 static inline s64 bch2_bucket_sectors_total(struct bch_alloc_v4 a) 94 { 95 return a.stripe_sectors + a.dirty_sectors + a.cached_sectors; 96 } 97 98 static inline s64 bch2_bucket_sectors_dirty(struct bch_alloc_v4 a) 99 { 100 return a.stripe_sectors + a.dirty_sectors; 101 } 102 103 static inline s64 bch2_bucket_sectors(struct bch_alloc_v4 a) 104 { 105 return a.data_type == BCH_DATA_cached 106 ? a.cached_sectors 107 : bch2_bucket_sectors_dirty(a); 108 } 109 110 static inline s64 bch2_bucket_sectors_fragmented(struct bch_dev *ca, 111 struct bch_alloc_v4 a) 112 { 113 int d = bch2_bucket_sectors(a); 114 115 return d ? max(0, ca->mi.bucket_size - d) : 0; 116 } 117 118 static inline s64 bch2_gc_bucket_sectors_fragmented(struct bch_dev *ca, struct bucket a) 119 { 120 int d = a.stripe_sectors + a.dirty_sectors; 121 122 return d ? max(0, ca->mi.bucket_size - d) : 0; 123 } 124 125 static inline s64 bch2_bucket_sectors_unstriped(struct bch_alloc_v4 a) 126 { 127 return a.data_type == BCH_DATA_stripe ? a.dirty_sectors : 0; 128 } 129 130 static inline enum bch_data_type alloc_data_type(struct bch_alloc_v4 a, 131 enum bch_data_type data_type) 132 { 133 if (a.stripe) 134 return data_type == BCH_DATA_parity ? data_type : BCH_DATA_stripe; 135 if (bch2_bucket_sectors_dirty(a)) 136 return data_type; 137 if (a.cached_sectors) 138 return BCH_DATA_cached; 139 if (BCH_ALLOC_V4_NEED_DISCARD(&a)) 140 return BCH_DATA_need_discard; 141 if (alloc_gc_gen(a) >= BUCKET_GC_GEN_MAX) 142 return BCH_DATA_need_gc_gens; 143 return BCH_DATA_free; 144 } 145 146 static inline void alloc_data_type_set(struct bch_alloc_v4 *a, enum bch_data_type data_type) 147 { 148 a->data_type = alloc_data_type(*a, data_type); 149 } 150 151 static inline u64 alloc_lru_idx_read(struct bch_alloc_v4 a) 152 { 153 return a.data_type == BCH_DATA_cached 154 ? a.io_time[READ] & LRU_TIME_MAX 155 : 0; 156 } 157 158 #define DATA_TYPES_MOVABLE \ 159 ((1U << BCH_DATA_btree)| \ 160 (1U << BCH_DATA_user)| \ 161 (1U << BCH_DATA_stripe)) 162 163 static inline bool data_type_movable(enum bch_data_type type) 164 { 165 return (1U << type) & DATA_TYPES_MOVABLE; 166 } 167 168 static inline u64 alloc_lru_idx_fragmentation(struct bch_alloc_v4 a, 169 struct bch_dev *ca) 170 { 171 if (!data_type_movable(a.data_type) || 172 !bch2_bucket_sectors_fragmented(ca, a)) 173 return 0; 174 175 /* 176 * avoid overflowing LRU_TIME_BITS on a corrupted fs, when 177 * bucket_sectors_dirty is (much) bigger than bucket_size 178 */ 179 u64 d = min_t(s64, bch2_bucket_sectors_dirty(a), 180 ca->mi.bucket_size); 181 182 return div_u64(d * (1ULL << 31), ca->mi.bucket_size); 183 } 184 185 static inline u64 alloc_freespace_genbits(struct bch_alloc_v4 a) 186 { 187 return ((u64) alloc_gc_gen(a) >> 4) << 56; 188 } 189 190 static inline struct bpos alloc_freespace_pos(struct bpos pos, struct bch_alloc_v4 a) 191 { 192 pos.offset |= alloc_freespace_genbits(a); 193 return pos; 194 } 195 196 static inline unsigned alloc_v4_u64s_noerror(const struct bch_alloc_v4 *a) 197 { 198 return (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?: 199 BCH_ALLOC_V4_U64s_V0) + 200 BCH_ALLOC_V4_NR_BACKPOINTERS(a) * 201 (sizeof(struct bch_backpointer) / sizeof(u64)); 202 } 203 204 static inline unsigned alloc_v4_u64s(const struct bch_alloc_v4 *a) 205 { 206 unsigned ret = alloc_v4_u64s_noerror(a); 207 BUG_ON(ret > U8_MAX - BKEY_U64s); 208 return ret; 209 } 210 211 static inline void set_alloc_v4_u64s(struct bkey_i_alloc_v4 *a) 212 { 213 set_bkey_val_u64s(&a->k, alloc_v4_u64s(&a->v)); 214 } 215 216 struct bkey_i_alloc_v4 * 217 bch2_trans_start_alloc_update_noupdate(struct btree_trans *, struct btree_iter *, struct bpos); 218 struct bkey_i_alloc_v4 * 219 bch2_trans_start_alloc_update(struct btree_trans *, struct bpos, 220 enum btree_iter_update_trigger_flags); 221 222 void __bch2_alloc_to_v4(struct bkey_s_c, struct bch_alloc_v4 *); 223 224 static inline const struct bch_alloc_v4 *bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *convert) 225 { 226 const struct bch_alloc_v4 *ret; 227 228 if (unlikely(k.k->type != KEY_TYPE_alloc_v4)) 229 goto slowpath; 230 231 ret = bkey_s_c_to_alloc_v4(k).v; 232 if (BCH_ALLOC_V4_BACKPOINTERS_START(ret) != BCH_ALLOC_V4_U64s) 233 goto slowpath; 234 235 return ret; 236 slowpath: 237 __bch2_alloc_to_v4(k, convert); 238 return convert; 239 } 240 241 struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut(struct btree_trans *, struct bkey_s_c); 242 243 int bch2_bucket_io_time_reset(struct btree_trans *, unsigned, size_t, int); 244 245 int bch2_alloc_v1_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); 246 int bch2_alloc_v2_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); 247 int bch2_alloc_v3_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); 248 int bch2_alloc_v4_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags); 249 void bch2_alloc_v4_swab(struct bkey_s); 250 void bch2_alloc_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); 251 252 #define bch2_bkey_ops_alloc ((struct bkey_ops) { \ 253 .key_validate = bch2_alloc_v1_validate, \ 254 .val_to_text = bch2_alloc_to_text, \ 255 .trigger = bch2_trigger_alloc, \ 256 .min_val_size = 8, \ 257 }) 258 259 #define bch2_bkey_ops_alloc_v2 ((struct bkey_ops) { \ 260 .key_validate = bch2_alloc_v2_validate, \ 261 .val_to_text = bch2_alloc_to_text, \ 262 .trigger = bch2_trigger_alloc, \ 263 .min_val_size = 8, \ 264 }) 265 266 #define bch2_bkey_ops_alloc_v3 ((struct bkey_ops) { \ 267 .key_validate = bch2_alloc_v3_validate, \ 268 .val_to_text = bch2_alloc_to_text, \ 269 .trigger = bch2_trigger_alloc, \ 270 .min_val_size = 16, \ 271 }) 272 273 #define bch2_bkey_ops_alloc_v4 ((struct bkey_ops) { \ 274 .key_validate = bch2_alloc_v4_validate, \ 275 .val_to_text = bch2_alloc_to_text, \ 276 .swab = bch2_alloc_v4_swab, \ 277 .trigger = bch2_trigger_alloc, \ 278 .min_val_size = 48, \ 279 }) 280 281 int bch2_bucket_gens_validate(struct bch_fs *, struct bkey_s_c, 282 enum bch_validate_flags); 283 void bch2_bucket_gens_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); 284 285 #define bch2_bkey_ops_bucket_gens ((struct bkey_ops) { \ 286 .key_validate = bch2_bucket_gens_validate, \ 287 .val_to_text = bch2_bucket_gens_to_text, \ 288 }) 289 290 int bch2_bucket_gens_init(struct bch_fs *); 291 292 static inline bool bkey_is_alloc(const struct bkey *k) 293 { 294 return k->type == KEY_TYPE_alloc || 295 k->type == KEY_TYPE_alloc_v2 || 296 k->type == KEY_TYPE_alloc_v3; 297 } 298 299 int bch2_alloc_read(struct bch_fs *); 300 301 int bch2_alloc_key_to_dev_counters(struct btree_trans *, struct bch_dev *, 302 const struct bch_alloc_v4 *, 303 const struct bch_alloc_v4 *, unsigned); 304 int bch2_trigger_alloc(struct btree_trans *, enum btree_id, unsigned, 305 struct bkey_s_c, struct bkey_s, 306 enum btree_iter_update_trigger_flags); 307 int bch2_check_alloc_info(struct bch_fs *); 308 int bch2_check_alloc_to_lru_refs(struct bch_fs *); 309 void bch2_dev_do_discards(struct bch_dev *); 310 void bch2_do_discards(struct bch_fs *); 311 312 static inline u64 should_invalidate_buckets(struct bch_dev *ca, 313 struct bch_dev_usage u) 314 { 315 u64 want_free = ca->mi.nbuckets >> 7; 316 u64 free = max_t(s64, 0, 317 u.d[BCH_DATA_free].buckets 318 + u.d[BCH_DATA_need_discard].buckets 319 - bch2_dev_buckets_reserved(ca, BCH_WATERMARK_stripe)); 320 321 return clamp_t(s64, want_free - free, 0, u.d[BCH_DATA_cached].buckets); 322 } 323 324 void bch2_dev_do_invalidates(struct bch_dev *); 325 void bch2_do_invalidates(struct bch_fs *); 326 327 static inline struct bch_backpointer *alloc_v4_backpointers(struct bch_alloc_v4 *a) 328 { 329 return (void *) ((u64 *) &a->v + 330 (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?: 331 BCH_ALLOC_V4_U64s_V0)); 332 } 333 334 static inline const struct bch_backpointer *alloc_v4_backpointers_c(const struct bch_alloc_v4 *a) 335 { 336 return (void *) ((u64 *) &a->v + BCH_ALLOC_V4_BACKPOINTERS_START(a)); 337 } 338 339 int bch2_dev_freespace_init(struct bch_fs *, struct bch_dev *, u64, u64); 340 int bch2_fs_freespace_init(struct bch_fs *); 341 342 void bch2_recalc_capacity(struct bch_fs *); 343 u64 bch2_min_rw_member_capacity(struct bch_fs *); 344 345 void bch2_dev_allocator_remove(struct bch_fs *, struct bch_dev *); 346 void bch2_dev_allocator_add(struct bch_fs *, struct bch_dev *); 347 348 void bch2_dev_allocator_background_exit(struct bch_dev *); 349 void bch2_dev_allocator_background_init(struct bch_dev *); 350 351 void bch2_fs_allocator_background_init(struct bch_fs *); 352 353 #endif /* _BCACHEFS_ALLOC_BACKGROUND_H */ 354