fs/bcachefs/bkey_buf.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_BKEY_BUF_H
   3 #define _BCACHEFS_BKEY_BUF_H
   4
   5 #include "bcachefs.h"
   6 #include "bkey.h"
   7
   8 struct bkey_buf {
   9         struct bkey_i   *k;
  10         u64             onstack[12];
  11 };
  12
  13 static inline void bch2_bkey_buf_realloc(struct bkey_buf *s,
  14                                          struct bch_fs *c, unsigned u64s)
  15 {
  16         if (s->k == (void *) s->onstack &&
  17             u64s > ARRAY_SIZE(s->onstack)) {
  18                 s->k = mempool_alloc(&c->large_bkey_pool, GFP_NOFS);
  19                 memcpy(s->k, s->onstack, sizeof(s->onstack));
  20         }
  21 }
  22
  23 static inline void bch2_bkey_buf_reassemble(struct bkey_buf *s,
  24                                             struct bch_fs *c,
  25                                             struct bkey_s_c k)
  26 {
  27         bch2_bkey_buf_realloc(s, c, k.k->u64s);
  28         bkey_reassemble(s->k, k);
  29 }
  30
  31 static inline void bch2_bkey_buf_copy(struct bkey_buf *s,
  32                                       struct bch_fs *c,
  33                                       struct bkey_i *src)
  34 {
  35         bch2_bkey_buf_realloc(s, c, src->k.u64s);
  36         bkey_copy(s->k, src);
  37 }
  38
  39 static inline void bch2_bkey_buf_unpack(struct bkey_buf *s,
  40                                         struct bch_fs *c,
  41                                         struct btree *b,
  42                                         struct bkey_packed *src)
  43 {
  44         bch2_bkey_buf_realloc(s, c, BKEY_U64s +
  45                               bkeyp_val_u64s(&b->format, src));
  46         bch2_bkey_unpack(b, s->k, src);
  47 }
  48
  49 static inline void bch2_bkey_buf_init(struct bkey_buf *s)
  50 {
  51         s->k = (void *) s->onstack;
  52 }
  53
  54 static inline void bch2_bkey_buf_exit(struct bkey_buf *s, struct bch_fs *c)
  55 {
  56         if (s->k != (void *) s->onstack)
  57                 mempool_free(s->k, &c->large_bkey_pool);
  58         s->k = NULL;
  59 }
  60
  61 #endif /* _BCACHEFS_BKEY_BUF_H */