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"bcachefs.h" 6 #include "alloc_types.h" 7 #include "buckets.h" 8 #include "debug.h" 9 #include "super.h" 10 11 /* How out of date a pointer gen is allowed to be: */ 12 #define BUCKET_GC_GEN_MAX 96U 13 14 static inline bool bch2_dev_bucket_exists(struct bch_fs *c, struct bpos pos) 15 { 16 guard(rcu)(); 17 struct bch_dev *ca = bch2_dev_rcu_noerror(c, pos.inode); 18 return ca && bucket_valid(ca, pos.offset); 19 } 20 21 static inline u64 bucket_to_u64(struct bpos bucket) 22 { 23 return (bucket.inode << 48) | bucket.offset; 24 } 25 26 static inline struct bpos u64_to_bucket(u64 bucket) 27 { 28 return POS(bucket >> 48, bucket & ~(~0ULL << 48)); 29 } 30 31 static inline u8 alloc_gc_gen(struct bch_alloc_v4 a) 32 { 33 return a.gen - a.oldest_gen; 34 } 35 36 static inline void alloc_to_bucket(struct bucket *dst, struct bch_alloc_v4 src) 37 { 38 dst->gen = src.gen; 39 dst->data_type = src.data_type; 40 dst->stripe_sectors = src.stripe_sectors; 41 dst->dirty_sectors = src.dirty_sectors; 42 dst->cached_sectors = src.cached_sectors; 43 dst->stripe = src.stripe; 44 } 45 46 static inline void __bucket_m_to_alloc(struct bch_alloc_v4 *dst, struct bucket src) 47 { 48 dst->gen = src.gen; 49 dst->data_type = src.data_type; 50 dst->stripe_sectors = src.stripe_sectors; 51 dst->dirty_sectors = src.dirty_sectors; 52 dst->cached_sectors = src.cached_sectors; 53 dst->stripe = src.stripe; 54 } 55 56 static inline struct bch_alloc_v4 bucket_m_to_alloc(struct bucket b) 57 { 58 struct bch_alloc_v4 ret = {}; 59 __bucket_m_to_alloc(&ret, b); 60 return ret; 61 } 62 63 static inline enum bch_data_type bucket_data_type(enum bch_data_type data_type) 64 { 65 switch (data_type) { 66 case BCH_DATA_cached: 67 case BCH_DATA_stripe: 68 return BCH_DATA_user; 69 default: 70 return data_type; 71 } 72 } 73 74 static inline bool bucket_data_type_mismatch(enum bch_data_type bucket, 75 enum bch_data_type ptr) 76 { 77 return !data_type_is_empty(bucket) && 78 bucket_data_type(bucket) != bucket_data_type(ptr); 79 } 80 81 /* 82 * It is my general preference to use unsigned types for unsigned quantities - 83 * however, these helpers are used in disk accounting calculations run by 84 * triggers where the output will be negated and added to an s64. unsigned is 85 * right out even though all these quantities will fit in 32 bits, since it 86 * won't be sign extended correctly; u64 will negate "correctly", but s64 is the 87 * simpler option here. 88 */ 89 static inline s64 bch2_bucket_sectors_total(struct bch_alloc_v4 a) 90 { 91 return a.stripe_sectors + a.dirty_sectors + a.cached_sectors; 92 } 93 94 static inline s64 bch2_bucket_sectors_dirty(struct bch_alloc_v4 a) 95 { 96 return a.stripe_sectors + a.dirty_sectors; 97 } 98 99 static inline s64 bch2_bucket_sectors(struct bch_alloc_v4 a) 100 { 101 return a.data_type == BCH_DATA_cached 102 ? a.cached_sectors 103 : bch2_bucket_sectors_dirty(a); 104 } 105 106 static inline s64 bch2_bucket_sectors_fragmented(struct bch_dev *ca, 107 struct bch_alloc_v4 a) 108 { 109 int d = bch2_bucket_sectors(a); 110 111 return d ? max(0, ca->mi.bucket_size - d) : 0; 112 } 113 114 static inline s64 bch2_gc_bucket_sectors_fragmented(struct bch_dev *ca, struct bucket a) 115 { 116 int d = a.stripe_sectors + a.dirty_sectors; 117 118 return d ? max(0, ca->mi.bucket_size - d) : 0; 119 } 120 121 static inline s64 bch2_bucket_sectors_unstriped(struct bch_alloc_v4 a) 122 { 123 return a.data_type == BCH_DATA_stripe ? a.dirty_sectors : 0; 124 } 125 126 static inline enum bch_data_type alloc_data_type(struct bch_alloc_v4 a, 127 enum bch_data_type data_type) 128 { 129 if (a.stripe) 130 return data_type == BCH_DATA_parity ? data_type : BCH_DATA_stripe; 131 if (bch2_bucket_sectors_dirty(a)) 132 return bucket_data_type(data_type); 133 if (a.cached_sectors) 134 return BCH_DATA_cached; 135 if (BCH_ALLOC_V4_NEED_DISCARD(&a)) 136 return BCH_DATA_need_discard; 137 if (alloc_gc_gen(a) >= BUCKET_GC_GEN_MAX) 138 return BCH_DATA_need_gc_gens; 139 return BCH_DATA_free; 140 } 141 142 static inline void alloc_data_type_set(struct bch_alloc_v4 *a, enum bch_data_type data_type) 143 { 144 a->data_type = alloc_data_type(*a, data_type); 145 } 146 147 static inline u64 alloc_lru_idx_read(struct bch_alloc_v4 a) 148 { 149 return a.data_type == BCH_DATA_cached 150 ? a.io_time[READ] & LRU_TIME_MAX 151 : 0; 152 } 153 154 #define DATA_TYPES_MOVABLE \ 155 ((1U << BCH_DATA_btree)| \ 156 (1U << BCH_DATA_user)| \ 157 (1U << BCH_DATA_stripe)) 158 159 static inline bool data_type_movable(enum bch_data_type type) 160 { 161 return (1U << type) & DATA_TYPES_MOVABLE; 162 } 163 164 static inline u64 alloc_lru_idx_fragmentation(struct bch_alloc_v4 a, 165 struct bch_dev *ca) 166 { 167 if (a.data_type >= BCH_DATA_NR) 168 return 0; 169 170 if (!data_type_movable(a.data_type) || 171 !bch2_bucket_sectors_fragmented(ca, a)) 172 return 0; 173 174 /* 175 * avoid overflowing LRU_TIME_BITS on a corrupted fs, when 176 * bucket_sectors_dirty is (much) bigger than bucket_size 177 */ 178 u64 d = min_t(s64, bch2_bucket_sectors_dirty(a), 179 ca->mi.bucket_size); 180 181 return div_u64(d * (1ULL << 31), ca->mi.bucket_size); 182 } 183 184 static inline u64 alloc_freespace_genbits(struct bch_alloc_v4 a) 185 { 186 return ((u64) alloc_gc_gen(a) >> 4) << 56; 187 } 188 189 static inline struct bpos alloc_freespace_pos(struct bpos pos, struct bch_alloc_v4 a) 190 { 191 pos.offset |= alloc_freespace_genbits(a); 192 return pos; 193 } 194 195 static inline unsigned alloc_v4_u64s_noerror(const struct bch_alloc_v4 *a) 196 { 197 return (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?: 198 BCH_ALLOC_V4_U64s_V0) + 199 BCH_ALLOC_V4_NR_BACKPOINTERS(a) * 200 (sizeof(struct bch_backpointer) / sizeof(u64)); 201 } 202 203 static inline unsigned alloc_v4_u64s(const struct bch_alloc_v4 *a) 204 { 205 unsigned ret = alloc_v4_u64s_noerror(a); 206 BUG_ON(ret > U8_MAX - BKEY_U64s); 207 return ret; 208 } 209 210 static inline void set_alloc_v4_u64s(struct bkey_i_alloc_v4 *a) 211 { 212 set_bkey_val_u64s(&a->k, alloc_v4_u64s(&a->v)); 213 } 214 215 struct bkey_i_alloc_v4 * 216 bch2_trans_start_alloc_update_noupdate(struct btree_trans *, struct btree_iter *, struct bpos); 217 struct bkey_i_alloc_v4 * 218 bch2_trans_start_alloc_update(struct btree_trans *, struct bpos, 219 enum btree_iter_update_trigger_flags); 220 221 void __bch2_alloc_to_v4(struct bkey_s_c, struct bch_alloc_v4 *); 222 223 static inline const struct bch_alloc_v4 *bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *convert) 224 { 225 const struct bch_alloc_v4 *ret; 226 227 if (unlikely(k.k->type != KEY_TYPE_alloc_v4)) 228 goto slowpath; 229 230 ret = bkey_s_c_to_alloc_v4(k).v; 231 if (BCH_ALLOC_V4_BACKPOINTERS_START(ret) != BCH_ALLOC_V4_U64s) 232 goto slowpath; 233 234 return ret; 235 slowpath: 236 __bch2_alloc_to_v4(k, convert); 237 return convert; 238 } 239 240 struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut(struct btree_trans *, struct bkey_s_c); 241 242 int bch2_bucket_io_time_reset(struct btree_trans *, unsigned, size_t, int); 243 244 int bch2_alloc_v1_validate(struct bch_fs *, struct bkey_s_c, 245 struct bkey_validate_context); 246 int bch2_alloc_v2_validate(struct bch_fs *, struct bkey_s_c, 247 struct bkey_validate_context); 248 int bch2_alloc_v3_validate(struct bch_fs *, struct bkey_s_c, 249 struct bkey_validate_context); 250 int bch2_alloc_v4_validate(struct bch_fs *, struct bkey_s_c, 251 struct bkey_validate_context); 252 void bch2_alloc_v4_swab(struct bkey_s); 253 void bch2_alloc_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); 254 void bch2_alloc_v4_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); 255 256 #define bch2_bkey_ops_alloc ((struct bkey_ops) { \ 257 .key_validate = bch2_alloc_v1_validate, \ 258 .val_to_text = bch2_alloc_to_text, \ 259 .trigger = bch2_trigger_alloc, \ 260 .min_val_size = 8, \ 261 }) 262 263 #define bch2_bkey_ops_alloc_v2 ((struct bkey_ops) { \ 264 .key_validate = bch2_alloc_v2_validate, \ 265 .val_to_text = bch2_alloc_to_text, \ 266 .trigger = bch2_trigger_alloc, \ 267 .min_val_size = 8, \ 268 }) 269 270 #define bch2_bkey_ops_alloc_v3 ((struct bkey_ops) { \ 271 .key_validate = bch2_alloc_v3_validate, \ 272 .val_to_text = bch2_alloc_to_text, \ 273 .trigger = bch2_trigger_alloc, \ 274 .min_val_size = 16, \ 275 }) 276 277 #define bch2_bkey_ops_alloc_v4 ((struct bkey_ops) { \ 278 .key_validate = bch2_alloc_v4_validate, \ 279 .val_to_text = bch2_alloc_v4_to_text, \ 280 .swab = bch2_alloc_v4_swab, \ 281 .trigger = bch2_trigger_alloc, \ 282 .min_val_size = 48, \ 283 }) 284 285 int bch2_bucket_gens_validate(struct bch_fs *, struct bkey_s_c, 286 struct bkey_validate_context); 287 void bch2_bucket_gens_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c); 288 289 #define bch2_bkey_ops_bucket_gens ((struct bkey_ops) { \ 290 .key_validate = bch2_bucket_gens_validate, \ 291 .val_to_text = bch2_bucket_gens_to_text, \ 292 }) 293 294 int bch2_bucket_gens_init(struct bch_fs *); 295 296 static inline bool bkey_is_alloc(const struct bkey *k) 297 { 298 return k->type == KEY_TYPE_alloc || 299 k->type == KEY_TYPE_alloc_v2 || 300 k->type == KEY_TYPE_alloc_v3; 301 } 302 303 int bch2_alloc_read(struct bch_fs *); 304 305 int bch2_alloc_key_to_dev_counters(struct btree_trans *, struct bch_dev *, 306 const struct bch_alloc_v4 *, 307 const struct bch_alloc_v4 *, unsigned); 308 int bch2_trigger_alloc(struct btree_trans *, enum btree_id, unsigned, 309 struct bkey_s_c, struct bkey_s, 310 enum btree_iter_update_trigger_flags); 311 312 int bch2_check_discard_freespace_key(struct btree_trans *, struct btree_iter *, u8 *, bool); 313 int bch2_check_alloc_info(struct bch_fs *); 314 int bch2_check_alloc_to_lru_refs(struct bch_fs *); 315 void bch2_dev_do_discards(struct bch_dev *); 316 void bch2_do_discards(struct bch_fs *); 317 318 static inline u64 should_invalidate_buckets(struct bch_dev *ca, 319 struct bch_dev_usage u) 320 { 321 u64 want_free = ca->mi.nbuckets >> 7; 322 u64 free = max_t(s64, 0, 323 u.buckets[BCH_DATA_free] 324 + u.buckets[BCH_DATA_need_discard] 325 - bch2_dev_buckets_reserved(ca, BCH_WATERMARK_stripe)); 326 327 return clamp_t(s64, want_free - free, 0, u.buckets[BCH_DATA_cached]); 328 } 329 330 void bch2_dev_do_invalidates(struct bch_dev *); 331 void bch2_do_invalidates(struct bch_fs *); 332 333 static inline struct bch_backpointer *alloc_v4_backpointers(struct bch_alloc_v4 *a) 334 { 335 return (void *) ((u64 *) &a->v + 336 (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?: 337 BCH_ALLOC_V4_U64s_V0)); 338 } 339 340 static inline const struct bch_backpointer *alloc_v4_backpointers_c(const struct bch_alloc_v4 *a) 341 { 342 return (void *) ((u64 *) &a->v + BCH_ALLOC_V4_BACKPOINTERS_START(a)); 343 } 344 345 int bch2_dev_freespace_init(struct bch_fs *, struct bch_dev *, u64, u64); 346 int bch2_fs_freespace_init(struct bch_fs *); 347 int bch2_dev_remove_alloc(struct bch_fs *, struct bch_dev *); 348 349 void bch2_recalc_capacity(struct bch_fs *); 350 u64 bch2_min_rw_member_capacity(struct bch_fs *); 351 352 void bch2_dev_allocator_set_rw(struct bch_fs *, struct bch_dev *, bool); 353 void bch2_dev_allocator_remove(struct bch_fs *, struct bch_dev *); 354 void bch2_dev_allocator_add(struct bch_fs *, struct bch_dev *); 355 356 void bch2_dev_allocator_background_exit(struct bch_dev *); 357 void bch2_dev_allocator_background_init(struct bch_dev *); 358 359 void bch2_fs_allocator_background_init(struct bch_fs *); 360 361 #endif /* _BCACHEFS_ALLOC_BACKGROUND_H */ 362