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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_BTREE_TYPES_H
   3 #define _BCACHEFS_BTREE_TYPES_H
   4
   5 #include <linux/list.h>
   6 #include <linux/rhashtable.h>
   7 #include <linux/six.h>
   8
   9 #include "bkey_methods.h"
  10 #include "buckets_types.h"
  11 #include "darray.h"
  12 #include "journal_types.h"
  13
  14 struct open_bucket;
  15 struct btree_update;
  16 struct btree_trans;
  17
  18 #define MAX_BSETS               3U
  19
  20 struct btree_nr_keys {
  21
  22         /*
  23          * Amount of live metadata (i.e. size of node after a compaction) in
  24          * units of u64s
  25          */
  26         u16                     live_u64s;
  27         u16                     bset_u64s[MAX_BSETS];
  28
  29         /* live keys only: */
  30         u16                     packed_keys;
  31         u16                     unpacked_keys;
  32 };
  33
  34 struct bset_tree {
  35         /*
  36          * We construct a binary tree in an array as if the array
  37          * started at 1, so that things line up on the same cachelines
  38          * better: see comments in bset.c at cacheline_to_bkey() for
  39          * details
  40          */
  41
  42         /* size of the binary tree and prev array */
  43         u16                     size;
  44
  45         /* function of size - precalculated for to_inorder() */
  46         u16                     extra;
  47
  48         u16                     data_offset;
  49         u16                     aux_data_offset;
  50         u16                     end_offset;
  51 };
  52
  53 struct btree_write {
  54         struct journal_entry_pin        journal;
  55 };
  56
  57 struct btree_alloc {
  58         struct open_buckets     ob;
  59         __BKEY_PADDED(k, BKEY_BTREE_PTR_VAL_U64s_MAX);
  60 };
  61
  62 struct btree_bkey_cached_common {
  63         struct six_lock         lock;
  64         u8                      level;
  65         u8                      btree_id;
  66 };
  67
  68 struct btree {
  69         struct btree_bkey_cached_common c;
  70
  71         struct rhash_head       hash;
  72         u64                     hash_val;
  73
  74         unsigned long           flags;
  75         u16                     written;
  76         u8                      nsets;
  77         u8                      nr_key_bits;
  78         u16                     version_ondisk;
  79
  80         struct bkey_format      format;
  81
  82         struct btree_node       *data;
  83         void                    *aux_data;
  84
  85         /*
  86          * Sets of sorted keys - the real btree node - plus a binary search tree
  87          *
  88          * set[0] is special; set[0]->tree, set[0]->prev and set[0]->data point
  89          * to the memory we have allocated for this btree node. Additionally,
  90          * set[0]->data points to the entire btree node as it exists on disk.
  91          */
  92         struct bset_tree        set[MAX_BSETS];
  93
  94         struct btree_nr_keys    nr;
  95         u16                     sib_u64s[2];
  96         u16                     whiteout_u64s;
  97         u8                      byte_order;
  98         u8                      unpack_fn_len;
  99
 100         struct btree_write      writes[2];
 101
 102         /* Key/pointer for this btree node */
 103         __BKEY_PADDED(key, BKEY_BTREE_PTR_VAL_U64s_MAX);
 104
 105         /*
 106          * XXX: add a delete sequence number, so when bch2_btree_node_relock()
 107          * fails because the lock sequence number has changed - i.e. the
 108          * contents were modified - we can still relock the node if it's still
 109          * the one we want, without redoing the traversal
 110          */
 111
 112         /*
 113          * For asynchronous splits/interior node updates:
 114          * When we do a split, we allocate new child nodes and update the parent
 115          * node to point to them: we update the parent in memory immediately,
 116          * but then we must wait until the children have been written out before
 117          * the update to the parent can be written - this is a list of the
 118          * btree_updates that are blocking this node from being
 119          * written:
 120          */
 121         struct list_head        write_blocked;
 122
 123         /*
 124          * Also for asynchronous splits/interior node updates:
 125          * If a btree node isn't reachable yet, we don't want to kick off
 126          * another write - because that write also won't yet be reachable and
 127          * marking it as completed before it's reachable would be incorrect:
 128          */
 129         unsigned long           will_make_reachable;
 130
 131         struct open_buckets     ob;
 132
 133         /* lru list */
 134         struct list_head        list;
 135 };
 136
 137 struct btree_cache {
 138         struct rhashtable       table;
 139         bool                    table_init_done;
 140         /*
 141          * We never free a struct btree, except on shutdown - we just put it on
 142          * the btree_cache_freed list and reuse it later. This simplifies the
 143          * code, and it doesn't cost us much memory as the memory usage is
 144          * dominated by buffers that hold the actual btree node data and those
 145          * can be freed - and the number of struct btrees allocated is
 146          * effectively bounded.
 147          *
 148          * btree_cache_freeable effectively is a small cache - we use it because
 149          * high order page allocations can be rather expensive, and it's quite
 150          * common to delete and allocate btree nodes in quick succession. It
 151          * should never grow past ~2-3 nodes in practice.
 152          */
 153         struct mutex            lock;
 154         struct list_head        live;
 155         struct list_head        freeable;
 156         struct list_head        freed_pcpu;
 157         struct list_head        freed_nonpcpu;
 158
 159         /* Number of elements in live + freeable lists */
 160         unsigned                used;
 161         unsigned                reserve;
 162         atomic_t                dirty;
 163         struct shrinker         shrink;
 164
 165         /*
 166          * If we need to allocate memory for a new btree node and that
 167          * allocation fails, we can cannibalize another node in the btree cache
 168          * to satisfy the allocation - lock to guarantee only one thread does
 169          * this at a time:
 170          */
 171         struct task_struct      *alloc_lock;
 172         struct closure_waitlist alloc_wait;
 173 };
 174
 175 struct btree_node_iter {
 176         struct btree_node_iter_set {
 177                 u16     k, end;
 178         } data[MAX_BSETS];
 179 };
 180
 181 /*
 182  * Iterate over all possible positions, synthesizing deleted keys for holes:
 183  */
 184 #define BTREE_ITER_SLOTS                (1 << 0)
 185 #define BTREE_ITER_ALL_LEVELS           (1 << 1)
 186 /*
 187  * Indicates that intent locks should be taken on leaf nodes, because we expect
 188  * to be doing updates:
 189  */
 190 #define BTREE_ITER_INTENT               (1 << 2)
 191 /*
 192  * Causes the btree iterator code to prefetch additional btree nodes from disk:
 193  */
 194 #define BTREE_ITER_PREFETCH             (1 << 3)
 195 /*
 196  * Used in bch2_btree_iter_traverse(), to indicate whether we're searching for
 197  * @pos or the first key strictly greater than @pos
 198  */
 199 #define BTREE_ITER_IS_EXTENTS           (1 << 4)
 200 #define BTREE_ITER_NOT_EXTENTS          (1 << 5)
 201 #define BTREE_ITER_CACHED               (1 << 6)
 202 #define BTREE_ITER_CACHED_NOFILL        (1 << 7)
 203 #define BTREE_ITER_CACHED_NOCREATE      (1 << 8)
 204 #define BTREE_ITER_WITH_KEY_CACHE       (1 << 9)
 205 #define BTREE_ITER_WITH_UPDATES         (1 << 10)
 206 #define BTREE_ITER_WITH_JOURNAL         (1 << 11)
 207 #define __BTREE_ITER_ALL_SNAPSHOTS      (1 << 12)
 208 #define BTREE_ITER_ALL_SNAPSHOTS        (1 << 13)
 209 #define BTREE_ITER_FILTER_SNAPSHOTS     (1 << 14)
 210 #define BTREE_ITER_NOPRESERVE           (1 << 15)
 211
 212 enum btree_path_uptodate {
 213         BTREE_ITER_UPTODATE             = 0,
 214         BTREE_ITER_NEED_RELOCK          = 1,
 215         BTREE_ITER_NEED_TRAVERSE        = 2,
 216 };
 217
 218 #define BTREE_ITER_NO_NODE_GET_LOCKS    ((struct btree *) 1)
 219 #define BTREE_ITER_NO_NODE_DROP         ((struct btree *) 2)
 220 #define BTREE_ITER_NO_NODE_LOCK_ROOT    ((struct btree *) 3)
 221 #define BTREE_ITER_NO_NODE_UP           ((struct btree *) 4)
 222 #define BTREE_ITER_NO_NODE_DOWN         ((struct btree *) 5)
 223 #define BTREE_ITER_NO_NODE_INIT         ((struct btree *) 6)
 224 #define BTREE_ITER_NO_NODE_ERROR        ((struct btree *) 7)
 225 #define BTREE_ITER_NO_NODE_CACHED       ((struct btree *) 8)
 226
 227 struct btree_path {
 228         u8                      idx;
 229         u8                      sorted_idx;
 230         u8                      ref;
 231         u8                      intent_ref;
 232
 233         /* btree_iter_copy starts here: */
 234         struct bpos             pos;
 235
 236         enum btree_id           btree_id:4;
 237         bool                    cached:1;
 238         bool                    preserve:1;
 239         enum btree_path_uptodate uptodate:2;
 240         /*
 241          * When true, failing to relock this path will cause the transaction to
 242          * restart:
 243          */
 244         bool                    should_be_locked:1;
 245         unsigned                level:3,
 246                                 locks_want:4,
 247                                 nodes_locked:4,
 248                                 nodes_intent_locked:4;
 249
 250         struct btree_path_level {
 251                 struct btree    *b;
 252                 struct btree_node_iter iter;
 253                 u32             lock_seq;
 254         }                       l[BTREE_MAX_DEPTH];
 255 #ifdef CONFIG_BCACHEFS_DEBUG
 256         unsigned long           ip_allocated;
 257 #endif
 258 };
 259
 260 static inline struct btree_path_level *path_l(struct btree_path *path)
 261 {
 262         return path->l + path->level;
 263 }
 264
 265 /*
 266  * @pos                 - iterator's current position
 267  * @level               - current btree depth
 268  * @locks_want          - btree level below which we start taking intent locks
 269  * @nodes_locked        - bitmask indicating which nodes in @nodes are locked
 270  * @nodes_intent_locked - bitmask indicating which locks are intent locks
 271  */
 272 struct btree_iter {
 273         struct btree_trans      *trans;
 274         struct btree_path       *path;
 275         struct btree_path       *update_path;
 276         struct btree_path       *key_cache_path;
 277
 278         enum btree_id           btree_id:4;
 279         unsigned                min_depth:3;
 280         unsigned                advanced:1;
 281
 282         /* btree_iter_copy starts here: */
 283         u16                     flags;
 284
 285         /* When we're filtering by snapshot, the snapshot ID we're looking for: */
 286         unsigned                snapshot;
 287
 288         struct bpos             pos;
 289         struct bpos             pos_after_commit;
 290         /*
 291          * Current unpacked key - so that bch2_btree_iter_next()/
 292          * bch2_btree_iter_next_slot() can correctly advance pos.
 293          */
 294         struct bkey             k;
 295
 296         /* BTREE_ITER_WITH_JOURNAL: */
 297         size_t                  journal_idx;
 298         struct bpos             journal_pos;
 299 #ifdef CONFIG_BCACHEFS_DEBUG
 300         unsigned long           ip_allocated;
 301 #endif
 302 };
 303
 304 struct btree_key_cache {
 305         struct mutex            lock;
 306         struct rhashtable       table;
 307         bool                    table_init_done;
 308         struct list_head        freed;
 309         struct shrinker         shrink;
 310         unsigned                shrink_iter;
 311
 312         size_t                  nr_freed;
 313         atomic_long_t           nr_keys;
 314         atomic_long_t           nr_dirty;
 315 };
 316
 317 struct bkey_cached_key {
 318         u32                     btree_id;
 319         struct bpos             pos;
 320 } __attribute__((packed, aligned(4)));
 321
 322 #define BKEY_CACHED_ACCESSED            0
 323 #define BKEY_CACHED_DIRTY               1
 324
 325 struct bkey_cached {
 326         struct btree_bkey_cached_common c;
 327
 328         unsigned long           flags;
 329         u16                     u64s;
 330         bool                    valid;
 331         u32                     btree_trans_barrier_seq;
 332         struct bkey_cached_key  key;
 333
 334         struct rhash_head       hash;
 335         struct list_head        list;
 336
 337         struct journal_preres   res;
 338         struct journal_entry_pin journal;
 339
 340         struct bkey_i           *k;
 341 };
 342
 343 struct btree_insert_entry {
 344         unsigned                flags;
 345         u8                      bkey_type;
 346         enum btree_id           btree_id:8;
 347         u8                      level:4;
 348         bool                    cached:1;
 349         bool                    insert_trigger_run:1;
 350         bool                    overwrite_trigger_run:1;
 351         bool                    key_cache_already_flushed:1;
 352         /*
 353          * @old_k may be a key from the journal; @old_btree_u64s always refers
 354          * to the size of the key being overwritten in the btree:
 355          */
 356         u8                      old_btree_u64s;
 357         struct bkey_i           *k;
 358         struct btree_path       *path;
 359         /* key being overwritten: */
 360         struct bkey             old_k;
 361         const struct bch_val    *old_v;
 362         unsigned long           ip_allocated;
 363 };
 364
 365 #ifndef CONFIG_LOCKDEP
 366 #define BTREE_ITER_MAX          64
 367 #else
 368 #define BTREE_ITER_MAX          32
 369 #endif
 370
 371 struct btree_trans_commit_hook;
 372 typedef int (btree_trans_commit_hook_fn)(struct btree_trans *, struct btree_trans_commit_hook *);
 373
 374 struct btree_trans_commit_hook {
 375         btree_trans_commit_hook_fn      *fn;
 376         struct btree_trans_commit_hook  *next;
 377 };
 378
 379 #define BTREE_TRANS_MEM_MAX     (1U << 16)
 380
 381 struct btree_trans {
 382         struct bch_fs           *c;
 383         const char              *fn;
 384         struct list_head        list;
 385         struct btree            *locking;
 386         unsigned                locking_path_idx;
 387         struct bpos             locking_pos;
 388         u8                      locking_btree_id;
 389         u8                      locking_level;
 390         u8                      locking_lock_type;
 391         pid_t                   pid;
 392         int                     srcu_idx;
 393
 394         u8                      nr_sorted;
 395         u8                      nr_updates;
 396         u8                      traverse_all_idx;
 397         bool                    used_mempool:1;
 398         bool                    in_traverse_all:1;
 399         bool                    restarted:1;
 400         bool                    memory_allocation_failure:1;
 401         bool                    is_initial_gc:1;
 402         /*
 403          * For when bch2_trans_update notices we'll be splitting a compressed
 404          * extent:
 405          */
 406         unsigned                extra_journal_res;
 407
 408         u64                     paths_allocated;
 409
 410         unsigned                mem_top;
 411         unsigned                mem_bytes;
 412         void                    *mem;
 413
 414         u8                      sorted[BTREE_ITER_MAX];
 415         struct btree_path       *paths;
 416         struct btree_insert_entry *updates;
 417
 418         /* update path: */
 419         struct btree_trans_commit_hook *hooks;
 420         DARRAY(u64)             extra_journal_entries;
 421         struct journal_entry_pin *journal_pin;
 422
 423         struct journal_res      journal_res;
 424         struct journal_preres   journal_preres;
 425         u64                     *journal_seq;
 426         struct disk_reservation *disk_res;
 427         unsigned                flags;
 428         unsigned                journal_u64s;
 429         unsigned                journal_preres_u64s;
 430         struct replicas_delta_list *fs_usage_deltas;
 431 };
 432
 433 #define BTREE_FLAGS()                                                   \
 434         x(read_in_flight)                                               \
 435         x(read_error)                                                   \
 436         x(dirty)                                                        \
 437         x(need_write)                                                   \
 438         x(write_blocked)                                                \
 439         x(will_make_reachable)                                          \
 440         x(noevict)                                                      \
 441         x(write_idx)                                                    \
 442         x(accessed)                                                     \
 443         x(write_in_flight)                                              \
 444         x(write_in_flight_inner)                                        \
 445         x(just_written)                                                 \
 446         x(dying)                                                        \
 447         x(fake)                                                         \
 448         x(need_rewrite)                                                 \
 449         x(never_write)
 450
 451 enum btree_flags {
 452 #define x(flag) BTREE_NODE_##flag,
 453         BTREE_FLAGS()
 454 #undef x
 455 };
 456
 457 #define x(flag)                                                         \
 458 static inline bool btree_node_ ## flag(struct btree *b)                 \
 459 {       return test_bit(BTREE_NODE_ ## flag, &b->flags); }              \
 460                                                                         \
 461 static inline void set_btree_node_ ## flag(struct btree *b)             \
 462 {       set_bit(BTREE_NODE_ ## flag, &b->flags); }                      \
 463                                                                         \
 464 static inline void clear_btree_node_ ## flag(struct btree *b)           \
 465 {       clear_bit(BTREE_NODE_ ## flag, &b->flags); }
 466
 467 BTREE_FLAGS()
 468 #undef x
 469
 470 static inline struct btree_write *btree_current_write(struct btree *b)
 471 {
 472         return b->writes + btree_node_write_idx(b);
 473 }
 474
 475 static inline struct btree_write *btree_prev_write(struct btree *b)
 476 {
 477         return b->writes + (btree_node_write_idx(b) ^ 1);
 478 }
 479
 480 static inline struct bset_tree *bset_tree_last(struct btree *b)
 481 {
 482         EBUG_ON(!b->nsets);
 483         return b->set + b->nsets - 1;
 484 }
 485
 486 static inline void *
 487 __btree_node_offset_to_ptr(const struct btree *b, u16 offset)
 488 {
 489         return (void *) ((u64 *) b->data + 1 + offset);
 490 }
 491
 492 static inline u16
 493 __btree_node_ptr_to_offset(const struct btree *b, const void *p)
 494 {
 495         u16 ret = (u64 *) p - 1 - (u64 *) b->data;
 496
 497         EBUG_ON(__btree_node_offset_to_ptr(b, ret) != p);
 498         return ret;
 499 }
 500
 501 static inline struct bset *bset(const struct btree *b,
 502                                 const struct bset_tree *t)
 503 {
 504         return __btree_node_offset_to_ptr(b, t->data_offset);
 505 }
 506
 507 static inline void set_btree_bset_end(struct btree *b, struct bset_tree *t)
 508 {
 509         t->end_offset =
 510                 __btree_node_ptr_to_offset(b, vstruct_last(bset(b, t)));
 511 }
 512
 513 static inline void set_btree_bset(struct btree *b, struct bset_tree *t,
 514                                   const struct bset *i)
 515 {
 516         t->data_offset = __btree_node_ptr_to_offset(b, i);
 517         set_btree_bset_end(b, t);
 518 }
 519
 520 static inline struct bset *btree_bset_first(struct btree *b)
 521 {
 522         return bset(b, b->set);
 523 }
 524
 525 static inline struct bset *btree_bset_last(struct btree *b)
 526 {
 527         return bset(b, bset_tree_last(b));
 528 }
 529
 530 static inline u16
 531 __btree_node_key_to_offset(const struct btree *b, const struct bkey_packed *k)
 532 {
 533         return __btree_node_ptr_to_offset(b, k);
 534 }
 535
 536 static inline struct bkey_packed *
 537 __btree_node_offset_to_key(const struct btree *b, u16 k)
 538 {
 539         return __btree_node_offset_to_ptr(b, k);
 540 }
 541
 542 static inline unsigned btree_bkey_first_offset(const struct bset_tree *t)
 543 {
 544         return t->data_offset + offsetof(struct bset, _data) / sizeof(u64);
 545 }
 546
 547 #define btree_bkey_first(_b, _t)                                        \
 548 ({                                                                      \
 549         EBUG_ON(bset(_b, _t)->start !=                                  \
 550                 __btree_node_offset_to_key(_b, btree_bkey_first_offset(_t)));\
 551                                                                         \
 552         bset(_b, _t)->start;                                            \
 553 })
 554
 555 #define btree_bkey_last(_b, _t)                                         \
 556 ({                                                                      \
 557         EBUG_ON(__btree_node_offset_to_key(_b, (_t)->end_offset) !=     \
 558                 vstruct_last(bset(_b, _t)));                            \
 559                                                                         \
 560         __btree_node_offset_to_key(_b, (_t)->end_offset);               \
 561 })
 562
 563 static inline unsigned bset_u64s(struct bset_tree *t)
 564 {
 565         return t->end_offset - t->data_offset -
 566                 sizeof(struct bset) / sizeof(u64);
 567 }
 568
 569 static inline unsigned bset_dead_u64s(struct btree *b, struct bset_tree *t)
 570 {
 571         return bset_u64s(t) - b->nr.bset_u64s[t - b->set];
 572 }
 573
 574 static inline unsigned bset_byte_offset(struct btree *b, void *i)
 575 {
 576         return i - (void *) b->data;
 577 }
 578
 579 enum btree_node_type {
 580 #define x(kwd, val) BKEY_TYPE_##kwd = val,
 581         BCH_BTREE_IDS()
 582 #undef x
 583         BKEY_TYPE_btree,
 584 };
 585
 586 /* Type of a key in btree @id at level @level: */
 587 static inline enum btree_node_type __btree_node_type(unsigned level, enum btree_id id)
 588 {
 589         return level ? BKEY_TYPE_btree : (enum btree_node_type) id;
 590 }
 591
 592 /* Type of keys @b contains: */
 593 static inline enum btree_node_type btree_node_type(struct btree *b)
 594 {
 595         return __btree_node_type(b->c.level, b->c.btree_id);
 596 }
 597
 598 #define BTREE_NODE_TYPE_HAS_TRANS_TRIGGERS              \
 599         ((1U << BKEY_TYPE_extents)|                     \
 600          (1U << BKEY_TYPE_alloc)|                       \
 601          (1U << BKEY_TYPE_inodes)|                      \
 602          (1U << BKEY_TYPE_stripes)|                     \
 603          (1U << BKEY_TYPE_reflink)|                     \
 604          (1U << BKEY_TYPE_btree))
 605
 606 #define BTREE_NODE_TYPE_HAS_MEM_TRIGGERS                \
 607         ((1U << BKEY_TYPE_alloc)|                       \
 608          (1U << BKEY_TYPE_inodes)|                      \
 609          (1U << BKEY_TYPE_stripes)|                     \
 610          (1U << BKEY_TYPE_snapshots))
 611
 612 #define BTREE_NODE_TYPE_HAS_TRIGGERS                    \
 613         (BTREE_NODE_TYPE_HAS_TRANS_TRIGGERS|            \
 614          BTREE_NODE_TYPE_HAS_MEM_TRIGGERS)
 615
 616 #define BTREE_ID_IS_EXTENTS                             \
 617         ((1U << BTREE_ID_extents)|                      \
 618          (1U << BTREE_ID_reflink)|                      \
 619          (1U << BTREE_ID_freespace))
 620
 621 static inline bool btree_node_type_is_extents(enum btree_node_type type)
 622 {
 623         return (1U << type) & BTREE_ID_IS_EXTENTS;
 624 }
 625
 626 #define BTREE_ID_HAS_SNAPSHOTS                          \
 627         ((1U << BTREE_ID_extents)|                      \
 628          (1U << BTREE_ID_inodes)|                       \
 629          (1U << BTREE_ID_dirents)|                      \
 630          (1U << BTREE_ID_xattrs))
 631
 632 #define BTREE_ID_HAS_PTRS                               \
 633         ((1U << BTREE_ID_extents)|                      \
 634          (1U << BTREE_ID_reflink))
 635
 636 static inline bool btree_type_has_snapshots(enum btree_id id)
 637 {
 638         return (1 << id) & BTREE_ID_HAS_SNAPSHOTS;
 639 }
 640
 641 static inline bool btree_type_has_ptrs(enum btree_id id)
 642 {
 643         return (1 << id) & BTREE_ID_HAS_PTRS;
 644 }
 645
 646 static inline bool btree_node_type_needs_gc(enum btree_node_type type)
 647 {
 648         return BTREE_NODE_TYPE_HAS_TRIGGERS & (1U << type);
 649 }
 650
 651 struct btree_root {
 652         struct btree            *b;
 653
 654         /* On disk root - see async splits: */
 655         __BKEY_PADDED(key, BKEY_BTREE_PTR_VAL_U64s_MAX);
 656         u8                      level;
 657         u8                      alive;
 658         s8                      error;
 659 };
 660
 661 enum btree_insert_ret {
 662         BTREE_INSERT_OK,
 663         /* leaf node needs to be split */
 664         BTREE_INSERT_BTREE_NODE_FULL,
 665         BTREE_INSERT_NEED_MARK_REPLICAS,
 666         BTREE_INSERT_NEED_JOURNAL_RES,
 667         BTREE_INSERT_NEED_JOURNAL_RECLAIM,
 668 };
 669
 670 enum btree_gc_coalesce_fail_reason {
 671         BTREE_GC_COALESCE_FAIL_RESERVE_GET,
 672         BTREE_GC_COALESCE_FAIL_KEYLIST_REALLOC,
 673         BTREE_GC_COALESCE_FAIL_FORMAT_FITS,
 674 };
 675
 676 enum btree_node_sibling {
 677         btree_prev_sib,
 678         btree_next_sib,
 679 };
 680
 681 #endif /* _BCACHEFS_BTREE_TYPES_H */