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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_BTREE_ITER_H
   3 #define _BCACHEFS_BTREE_ITER_H
   4
   5 #include "bset.h"
   6 #include "btree_types.h"
   7
   8 #include <trace/events/bcachefs.h>
   9
  10 static inline void __btree_path_get(struct btree_path *path, bool intent)
  11 {
  12         path->ref++;
  13         path->intent_ref += intent;
  14 }
  15
  16 static inline bool __btree_path_put(struct btree_path *path, bool intent)
  17 {
  18         EBUG_ON(!path->ref);
  19         EBUG_ON(!path->intent_ref && intent);
  20         path->intent_ref -= intent;
  21         return --path->ref == 0;
  22 }
  23
  24 static inline void btree_path_set_dirty(struct btree_path *path,
  25                                         enum btree_path_uptodate u)
  26 {
  27         path->uptodate = max_t(unsigned, path->uptodate, u);
  28 }
  29
  30 static inline struct btree *btree_path_node(struct btree_path *path,
  31                                             unsigned level)
  32 {
  33         return level < BTREE_MAX_DEPTH ? path->l[level].b : NULL;
  34 }
  35
  36 static inline bool btree_node_lock_seq_matches(const struct btree_path *path,
  37                                         const struct btree *b, unsigned level)
  38 {
  39         /*
  40          * We don't compare the low bits of the lock sequence numbers because
  41          * @path might have taken a write lock on @b, and we don't want to skip
  42          * the linked path if the sequence numbers were equal before taking that
  43          * write lock. The lock sequence number is incremented by taking and
  44          * releasing write locks and is even when unlocked:
  45          */
  46         return path->l[level].lock_seq >> 1 == b->c.lock.state.seq >> 1;
  47 }
  48
  49 static inline struct btree *btree_node_parent(struct btree_path *path,
  50                                               struct btree *b)
  51 {
  52         return btree_path_node(path, b->c.level + 1);
  53 }
  54
  55 /* Iterate over paths within a transaction: */
  56
  57 static inline struct btree_path *
  58 __trans_next_path(struct btree_trans *trans, unsigned idx)
  59 {
  60         u64 l;
  61
  62         if (idx == BTREE_ITER_MAX)
  63                 return NULL;
  64
  65         l = trans->paths_allocated >> idx;
  66         if (!l)
  67                 return NULL;
  68
  69         idx += __ffs64(l);
  70         EBUG_ON(idx >= BTREE_ITER_MAX);
  71         EBUG_ON(trans->paths[idx].idx != idx);
  72         return &trans->paths[idx];
  73 }
  74
  75 void bch2_btree_path_check_sort(struct btree_trans *, struct btree_path *, int);
  76
  77 #define trans_for_each_path(_trans, _path)                              \
  78         for (_path = __trans_next_path((_trans), 0);                    \
  79              (_path);                                                   \
  80              _path = __trans_next_path((_trans), (_path)->idx + 1))
  81
  82 static inline struct btree_path *next_btree_path(struct btree_trans *trans, struct btree_path *path)
  83 {
  84         unsigned idx = path ? path->sorted_idx + 1 : 0;
  85
  86         EBUG_ON(idx > trans->nr_sorted);
  87
  88         return idx < trans->nr_sorted
  89                 ? trans->paths + trans->sorted[idx]
  90                 : NULL;
  91 }
  92
  93 static inline struct btree_path *prev_btree_path(struct btree_trans *trans, struct btree_path *path)
  94 {
  95         EBUG_ON(path->sorted_idx >= trans->nr_sorted);
  96         return path->sorted_idx
  97                 ? trans->paths + trans->sorted[path->sorted_idx - 1]
  98                 : NULL;
  99 }
 100
 101 #define trans_for_each_path_inorder(_trans, _path, _i)                  \
 102         for (_i = 0;                                                    \
 103              ((_path) = (_trans)->paths + trans->sorted[_i]), (_i) < (_trans)->nr_sorted;\
 104              _i++)
 105
 106 static inline bool __path_has_node(const struct btree_path *path,
 107                                    const struct btree *b)
 108 {
 109         return path->l[b->c.level].b == b &&
 110                 btree_node_lock_seq_matches(path, b, b->c.level);
 111 }
 112
 113 static inline struct btree_path *
 114 __trans_next_path_with_node(struct btree_trans *trans, struct btree *b,
 115                             unsigned idx)
 116 {
 117         struct btree_path *path = __trans_next_path(trans, idx);
 118
 119         while (path && !__path_has_node(path, b))
 120                 path = __trans_next_path(trans, path->idx + 1);
 121
 122         return path;
 123 }
 124
 125 #define trans_for_each_path_with_node(_trans, _b, _path)                \
 126         for (_path = __trans_next_path_with_node((_trans), (_b), 0);    \
 127              (_path);                                                   \
 128              _path = __trans_next_path_with_node((_trans), (_b),        \
 129                                                  (_path)->idx + 1))
 130
 131 struct btree_path * __must_check
 132 bch2_btree_path_make_mut(struct btree_trans *, struct btree_path *,
 133                          bool, unsigned long);
 134 struct btree_path * __must_check
 135 bch2_btree_path_set_pos(struct btree_trans *, struct btree_path *,
 136                         struct bpos, bool, unsigned long);
 137 int __must_check bch2_btree_path_traverse(struct btree_trans *,
 138                                           struct btree_path *, unsigned);
 139 struct btree_path *bch2_path_get(struct btree_trans *, enum btree_id, struct bpos,
 140                                  unsigned, unsigned, unsigned, unsigned long);
 141 inline struct bkey_s_c bch2_btree_path_peek_slot(struct btree_path *, struct bkey *);
 142
 143 struct bkey_i *bch2_btree_journal_peek_slot(struct btree_trans *,
 144                                         struct btree_iter *, struct bpos);
 145
 146 #ifdef CONFIG_BCACHEFS_DEBUG
 147 void bch2_trans_verify_paths(struct btree_trans *);
 148 void bch2_trans_verify_locks(struct btree_trans *);
 149 void bch2_assert_pos_locked(struct btree_trans *, enum btree_id,
 150                             struct bpos, bool);
 151 #else
 152 static inline void bch2_trans_verify_paths(struct btree_trans *trans) {}
 153 static inline void bch2_trans_verify_locks(struct btree_trans *trans) {}
 154 static inline void bch2_assert_pos_locked(struct btree_trans *trans, enum btree_id id,
 155                                           struct bpos pos, bool key_cache) {}
 156 #endif
 157
 158 void bch2_btree_path_fix_key_modified(struct btree_trans *trans,
 159                                       struct btree *, struct bkey_packed *);
 160 void bch2_btree_node_iter_fix(struct btree_trans *trans, struct btree_path *,
 161                               struct btree *, struct btree_node_iter *,
 162                               struct bkey_packed *, unsigned, unsigned);
 163
 164 int bch2_btree_path_relock_intent(struct btree_trans *, struct btree_path *);
 165
 166 void bch2_path_put(struct btree_trans *, struct btree_path *, bool);
 167
 168 int bch2_trans_relock(struct btree_trans *);
 169 void bch2_trans_unlock(struct btree_trans *);
 170
 171 static inline bool trans_was_restarted(struct btree_trans *trans, u32 restart_count)
 172 {
 173         return restart_count != trans->restart_count;
 174 }
 175
 176 void bch2_trans_verify_not_restarted(struct btree_trans *, u32);
 177
 178 __always_inline
 179 static inline int btree_trans_restart_nounlock(struct btree_trans *trans, int err)
 180 {
 181         BUG_ON(err <= 0);
 182         BUG_ON(!bch2_err_matches(err, BCH_ERR_transaction_restart));
 183
 184         trans->restarted = err;
 185         trans->restart_count++;
 186         return -err;
 187 }
 188
 189 __always_inline
 190 static inline int btree_trans_restart(struct btree_trans *trans, int err)
 191 {
 192         btree_trans_restart_nounlock(trans, err);
 193         return -err;
 194 }
 195
 196 bool bch2_btree_node_upgrade(struct btree_trans *,
 197                              struct btree_path *, unsigned);
 198
 199 bool __bch2_btree_path_upgrade(struct btree_trans *,
 200                                struct btree_path *, unsigned);
 201
 202 static inline bool bch2_btree_path_upgrade(struct btree_trans *trans,
 203                                            struct btree_path *path,
 204                                            unsigned new_locks_want)
 205 {
 206         new_locks_want = min(new_locks_want, BTREE_MAX_DEPTH);
 207
 208         return path->locks_want < new_locks_want
 209                 ? __bch2_btree_path_upgrade(trans, path, new_locks_want)
 210                 : path->uptodate == BTREE_ITER_UPTODATE;
 211 }
 212
 213 void __bch2_btree_path_downgrade(struct btree_trans *, struct btree_path *, unsigned);
 214
 215 static inline void bch2_btree_path_downgrade(struct btree_trans *trans,
 216                                              struct btree_path *path)
 217 {
 218         unsigned new_locks_want = path->level + !!path->intent_ref;
 219
 220         if (path->locks_want > new_locks_want)
 221                 __bch2_btree_path_downgrade(trans, path, new_locks_want);
 222 }
 223
 224 void bch2_trans_downgrade(struct btree_trans *);
 225
 226 void bch2_trans_node_add(struct btree_trans *trans, struct btree *);
 227 void bch2_trans_node_reinit_iter(struct btree_trans *, struct btree *);
 228
 229 int __must_check __bch2_btree_iter_traverse(struct btree_iter *iter);
 230 int __must_check bch2_btree_iter_traverse(struct btree_iter *);
 231
 232 struct btree *bch2_btree_iter_peek_node(struct btree_iter *);
 233 struct btree *bch2_btree_iter_next_node(struct btree_iter *);
 234
 235 struct bkey_s_c bch2_btree_iter_peek_upto(struct btree_iter *, struct bpos);
 236 struct bkey_s_c bch2_btree_iter_next(struct btree_iter *);
 237
 238 struct bkey_s_c bch2_btree_iter_peek_all_levels(struct btree_iter *);
 239
 240 static inline struct bkey_s_c bch2_btree_iter_peek(struct btree_iter *iter)
 241 {
 242         return bch2_btree_iter_peek_upto(iter, SPOS_MAX);
 243 }
 244
 245 struct bkey_s_c bch2_btree_iter_peek_prev(struct btree_iter *);
 246 struct bkey_s_c bch2_btree_iter_prev(struct btree_iter *);
 247
 248 struct bkey_s_c bch2_btree_iter_peek_slot(struct btree_iter *);
 249 struct bkey_s_c bch2_btree_iter_next_slot(struct btree_iter *);
 250 struct bkey_s_c bch2_btree_iter_prev_slot(struct btree_iter *);
 251
 252 bool bch2_btree_iter_advance(struct btree_iter *);
 253 bool bch2_btree_iter_rewind(struct btree_iter *);
 254
 255 static inline void __bch2_btree_iter_set_pos(struct btree_iter *iter, struct bpos new_pos)
 256 {
 257         iter->k.type = KEY_TYPE_deleted;
 258         iter->k.p.inode         = iter->pos.inode       = new_pos.inode;
 259         iter->k.p.offset        = iter->pos.offset      = new_pos.offset;
 260         iter->k.p.snapshot      = iter->pos.snapshot    = new_pos.snapshot;
 261         iter->k.size = 0;
 262 }
 263
 264 static inline void bch2_btree_iter_set_pos(struct btree_iter *iter, struct bpos new_pos)
 265 {
 266         if (unlikely(iter->update_path))
 267                 bch2_path_put(iter->trans, iter->update_path,
 268                               iter->flags & BTREE_ITER_INTENT);
 269         iter->update_path = NULL;
 270
 271         if (!(iter->flags & BTREE_ITER_ALL_SNAPSHOTS))
 272                 new_pos.snapshot = iter->snapshot;
 273
 274         __bch2_btree_iter_set_pos(iter, new_pos);
 275 }
 276
 277 static inline void bch2_btree_iter_set_pos_to_extent_start(struct btree_iter *iter)
 278 {
 279         BUG_ON(!(iter->flags & BTREE_ITER_IS_EXTENTS));
 280         iter->pos = bkey_start_pos(&iter->k);
 281 }
 282
 283 static inline void bch2_btree_iter_set_snapshot(struct btree_iter *iter, u32 snapshot)
 284 {
 285         struct bpos pos = iter->pos;
 286
 287         iter->snapshot = snapshot;
 288         pos.snapshot = snapshot;
 289         bch2_btree_iter_set_pos(iter, pos);
 290 }
 291
 292 void bch2_trans_iter_exit(struct btree_trans *, struct btree_iter *);
 293 void bch2_trans_iter_init(struct btree_trans *, struct btree_iter *,
 294                           unsigned, struct bpos, unsigned);
 295 void bch2_trans_node_iter_init(struct btree_trans *, struct btree_iter *,
 296                                enum btree_id, struct bpos,
 297                                unsigned, unsigned, unsigned);
 298 void bch2_trans_copy_iter(struct btree_iter *, struct btree_iter *);
 299
 300 static inline void set_btree_iter_dontneed(struct btree_iter *iter)
 301 {
 302         if (!iter->trans->restarted)
 303                 iter->path->preserve = false;
 304 }
 305
 306 void *bch2_trans_kmalloc(struct btree_trans *, size_t);
 307 u32 bch2_trans_begin(struct btree_trans *);
 308
 309 static inline struct btree *
 310 __btree_iter_peek_node_and_restart(struct btree_trans *trans, struct btree_iter *iter)
 311 {
 312         struct btree *b;
 313
 314         while (b = bch2_btree_iter_peek_node(iter),
 315                bch2_err_matches(PTR_ERR_OR_ZERO(b), BCH_ERR_transaction_restart))
 316                 bch2_trans_begin(trans);
 317
 318         return b;
 319 }
 320
 321 #define __for_each_btree_node(_trans, _iter, _btree_id, _start,         \
 322                               _locks_want, _depth, _flags, _b, _ret)    \
 323         for (bch2_trans_node_iter_init((_trans), &(_iter), (_btree_id), \
 324                                 _start, _locks_want, _depth, _flags);   \
 325              (_b) = __btree_iter_peek_node_and_restart((_trans), &(_iter)),\
 326              !((_ret) = PTR_ERR_OR_ZERO(_b)) && (_b);                   \
 327              (_b) = bch2_btree_iter_next_node(&(_iter)))
 328
 329 #define for_each_btree_node(_trans, _iter, _btree_id, _start,           \
 330                             _flags, _b, _ret)                           \
 331         __for_each_btree_node(_trans, _iter, _btree_id, _start,         \
 332                               0, 0, _flags, _b, _ret)
 333
 334 static inline int bkey_err(struct bkey_s_c k)
 335 {
 336         return PTR_ERR_OR_ZERO(k.k);
 337 }
 338
 339 static inline struct bkey_s_c bch2_btree_iter_peek_prev_type(struct btree_iter *iter,
 340                                                              unsigned flags)
 341 {
 342         BUG_ON(flags & BTREE_ITER_ALL_LEVELS);
 343
 344         return  flags & BTREE_ITER_SLOTS      ? bch2_btree_iter_peek_slot(iter) :
 345                                                 bch2_btree_iter_peek_prev(iter);
 346 }
 347
 348 static inline struct bkey_s_c bch2_btree_iter_peek_type(struct btree_iter *iter,
 349                                                         unsigned flags)
 350 {
 351         return  flags & BTREE_ITER_ALL_LEVELS ? bch2_btree_iter_peek_all_levels(iter) :
 352                 flags & BTREE_ITER_SLOTS      ? bch2_btree_iter_peek_slot(iter) :
 353                                                 bch2_btree_iter_peek(iter);
 354 }
 355
 356 static inline struct bkey_s_c bch2_btree_iter_peek_upto_type(struct btree_iter *iter,
 357                                                              struct bpos end,
 358                                                              unsigned flags)
 359 {
 360         if (!(flags & BTREE_ITER_SLOTS))
 361                 return bch2_btree_iter_peek_upto(iter, end);
 362
 363         if (bkey_cmp(iter->pos, end) > 0)
 364                 return bkey_s_c_null;
 365
 366         return bch2_btree_iter_peek_slot(iter);
 367 }
 368
 369 static inline int btree_trans_too_many_iters(struct btree_trans *trans)
 370 {
 371         if (hweight64(trans->paths_allocated) > BTREE_ITER_MAX) {
 372                 trace_trans_restart_too_many_iters(trans, _THIS_IP_);
 373                 return btree_trans_restart(trans, BCH_ERR_transaction_restart_too_many_iters);
 374         }
 375
 376         return 0;
 377 }
 378
 379 static inline struct bkey_s_c
 380 __bch2_btree_iter_peek_and_restart(struct btree_trans *trans,
 381                                    struct btree_iter *iter, unsigned flags)
 382 {
 383         struct bkey_s_c k;
 384
 385         while (btree_trans_too_many_iters(trans) ||
 386                (k = bch2_btree_iter_peek_type(iter, flags),
 387                 bch2_err_matches(bkey_err(k), BCH_ERR_transaction_restart)))
 388                 bch2_trans_begin(trans);
 389
 390         return k;
 391 }
 392
 393 #define lockrestart_do(_trans, _do)                                     \
 394 ({                                                                      \
 395         int _ret;                                                       \
 396                                                                         \
 397         do {                                                            \
 398                 bch2_trans_begin(_trans);                               \
 399                 _ret = (_do);                                           \
 400         } while (bch2_err_matches(_ret, BCH_ERR_transaction_restart));  \
 401                                                                         \
 402         _ret;                                                           \
 403 })
 404
 405 /*
 406  * nested_lockrestart_do(), nested_commit_do():
 407  *
 408  * These are like lockrestart_do() and commit_do(), with two differences:
 409  *
 410  *  - We don't call bch2_trans_begin() unless we had a transaction restart
 411  *  - We return -BCH_ERR_transaction_restart_nested if we succeeded after a
 412  *  transaction restart
 413  */
 414 #define nested_lockrestart_do(_trans, _do)                              \
 415 ({                                                                      \
 416         u32 _restart_count, _orig_restart_count;                        \
 417         int _ret;                                                       \
 418                                                                         \
 419         _restart_count = _orig_restart_count = (_trans)->restart_count; \
 420                                                                         \
 421         while (bch2_err_matches(_ret = (_do), BCH_ERR_transaction_restart))\
 422                 _restart_count = bch2_trans_begin(_trans);              \
 423                                                                         \
 424         if (!_ret)                                                      \
 425                 bch2_trans_verify_not_restarted(_trans, _restart_count);\
 426                                                                         \
 427         if (!_ret && trans_was_restarted(_trans, _orig_restart_count))  \
 428                 _ret = -BCH_ERR_transaction_restart_nested;             \
 429                                                                         \
 430         _ret;                                                           \
 431 })
 432
 433 #define for_each_btree_key2(_trans, _iter, _btree_id,                   \
 434                             _start, _flags, _k, _do)                    \
 435 ({                                                                      \
 436         int _ret = 0;                                                   \
 437                                                                         \
 438         bch2_trans_iter_init((_trans), &(_iter), (_btree_id),           \
 439                              (_start), (_flags));                       \
 440                                                                         \
 441         while (1) {                                                     \
 442                 bch2_trans_begin(_trans);                               \
 443                 (_k) = bch2_btree_iter_peek_type(&(_iter), (_flags));   \
 444                 if (!(_k).k) {                                          \
 445                         _ret = 0;                                       \
 446                         break;                                          \
 447                 }                                                       \
 448                                                                         \
 449                 _ret = bkey_err(_k) ?: (_do);                           \
 450                 if (bch2_err_matches(_ret, BCH_ERR_transaction_restart))\
 451                         continue;                                       \
 452                 if (_ret)                                               \
 453                         break;                                          \
 454                 if (!bch2_btree_iter_advance(&(_iter)))                 \
 455                         break;                                          \
 456         }                                                               \
 457                                                                         \
 458         bch2_trans_iter_exit((_trans), &(_iter));                       \
 459         _ret;                                                           \
 460 })
 461
 462 #define for_each_btree_key_reverse(_trans, _iter, _btree_id,            \
 463                                    _start, _flags, _k, _do)             \
 464 ({                                                                      \
 465         int _ret = 0;                                                   \
 466                                                                         \
 467         bch2_trans_iter_init((_trans), &(_iter), (_btree_id),           \
 468                              (_start), (_flags));                       \
 469                                                                         \
 470         while (1) {                                                     \
 471                 bch2_trans_begin(_trans);                               \
 472                 (_k) = bch2_btree_iter_peek_prev_type(&(_iter), (_flags));\
 473                 if (!(_k).k) {                                          \
 474                         _ret = 0;                                       \
 475                         break;                                          \
 476                 }                                                       \
 477                                                                         \
 478                 _ret = bkey_err(_k) ?: (_do);                           \
 479                 if (bch2_err_matches(_ret, BCH_ERR_transaction_restart))\
 480                         continue;                                       \
 481                 if (_ret)                                               \
 482                         break;                                          \
 483                 if (!bch2_btree_iter_rewind(&(_iter)))                  \
 484                         break;                                          \
 485         }                                                               \
 486                                                                         \
 487         bch2_trans_iter_exit((_trans), &(_iter));                       \
 488         _ret;                                                           \
 489 })
 490
 491 #define for_each_btree_key_commit(_trans, _iter, _btree_id,             \
 492                                   _start, _iter_flags, _k,              \
 493                                   _disk_res, _journal_seq, _commit_flags,\
 494                                   _do)                                  \
 495         for_each_btree_key2(_trans, _iter, _btree_id, _start, _iter_flags, _k,\
 496                             (_do) ?: bch2_trans_commit(_trans, (_disk_res),\
 497                                         (_journal_seq), (_commit_flags)))
 498
 499 #define for_each_btree_key(_trans, _iter, _btree_id,                    \
 500                            _start, _flags, _k, _ret)                    \
 501         for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id),      \
 502                                   (_start), (_flags));                  \
 503              (_k) = __bch2_btree_iter_peek_and_restart((_trans), &(_iter), _flags),\
 504              !((_ret) = bkey_err(_k)) && (_k).k;                        \
 505              bch2_btree_iter_advance(&(_iter)))
 506
 507 #define for_each_btree_key_norestart(_trans, _iter, _btree_id,          \
 508                            _start, _flags, _k, _ret)                    \
 509         for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id),      \
 510                                   (_start), (_flags));                  \
 511              (_k) = bch2_btree_iter_peek_type(&(_iter), _flags),        \
 512              !((_ret) = bkey_err(_k)) && (_k).k;                        \
 513              bch2_btree_iter_advance(&(_iter)))
 514
 515 #define for_each_btree_key_upto_norestart(_trans, _iter, _btree_id,     \
 516                            _start, _end, _flags, _k, _ret)              \
 517         for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id),      \
 518                                   (_start), (_flags));                  \
 519              (_k) = bch2_btree_iter_peek_upto_type(&(_iter), _end, _flags),\
 520              !((_ret) = bkey_err(_k)) && (_k).k;                        \
 521              bch2_btree_iter_advance(&(_iter)))
 522
 523 #define for_each_btree_key_continue(_trans, _iter, _flags, _k, _ret)    \
 524         for (;                                                          \
 525              (_k) = __bch2_btree_iter_peek_and_restart((_trans), &(_iter), _flags),\
 526              !((_ret) = bkey_err(_k)) && (_k).k;                        \
 527              bch2_btree_iter_advance(&(_iter)))
 528
 529 #define for_each_btree_key_continue_norestart(_iter, _flags, _k, _ret)  \
 530         for (;                                                          \
 531              (_k) = bch2_btree_iter_peek_type(&(_iter), _flags),        \
 532              !((_ret) = bkey_err(_k)) && (_k).k;                        \
 533              bch2_btree_iter_advance(&(_iter)))
 534
 535 /* new multiple iterator interface: */
 536
 537 void bch2_trans_updates_to_text(struct printbuf *, struct btree_trans *);
 538 void bch2_dump_trans_updates(struct btree_trans *);
 539 void bch2_dump_trans_paths_updates(struct btree_trans *);
 540 void __bch2_trans_init(struct btree_trans *, struct bch_fs *,
 541                        unsigned, size_t, const char *);
 542 void bch2_trans_exit(struct btree_trans *);
 543
 544 #define bch2_trans_init(...)    __bch2_trans_init(__VA_ARGS__, __func__)
 545
 546 void bch2_btree_trans_to_text(struct printbuf *, struct btree_trans *);
 547
 548 void bch2_fs_btree_iter_exit(struct bch_fs *);
 549 int bch2_fs_btree_iter_init(struct bch_fs *);
 550
 551 #endif /* _BCACHEFS_BTREE_ITER_H */