fs/bcachefs/nocow_locking.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_NOCOW_LOCKING_H
   3 #define _BCACHEFS_NOCOW_LOCKING_H
   4
   5 #include "bcachefs.h"
   6 #include "alloc_background.h"
   7 #include "nocow_locking_types.h"
   8
   9 #include <linux/hash.h>
  10
  11 static inline struct nocow_lock_bucket *bucket_nocow_lock(struct bucket_nocow_lock_table *t,
  12                                                           u64 dev_bucket)
  13 {
  14         unsigned h = hash_64(dev_bucket, BUCKET_NOCOW_LOCKS_BITS);
  15
  16         return t->l + (h & (BUCKET_NOCOW_LOCKS - 1));
  17 }
  18
  19 #define BUCKET_NOCOW_LOCK_UPDATE        (1 << 0)
  20
  21 bool bch2_bucket_nocow_is_locked(struct bucket_nocow_lock_table *, struct bpos);
  22 void bch2_bucket_nocow_unlock(struct bucket_nocow_lock_table *, struct bpos, int);
  23 bool __bch2_bucket_nocow_trylock(struct nocow_lock_bucket *, u64, int);
  24 void __bch2_bucket_nocow_lock(struct bucket_nocow_lock_table *,
  25                               struct nocow_lock_bucket *, u64, int);
  26
  27 static inline void bch2_bucket_nocow_lock(struct bucket_nocow_lock_table *t,
  28                                           struct bpos bucket, int flags)
  29 {
  30         u64 dev_bucket = bucket_to_u64(bucket);
  31         struct nocow_lock_bucket *l = bucket_nocow_lock(t, dev_bucket);
  32
  33         __bch2_bucket_nocow_lock(t, l, dev_bucket, flags);
  34 }
  35
  36 static inline bool bch2_bucket_nocow_trylock(struct bucket_nocow_lock_table *t,
  37                                           struct bpos bucket, int flags)
  38 {
  39         u64 dev_bucket = bucket_to_u64(bucket);
  40         struct nocow_lock_bucket *l = bucket_nocow_lock(t, dev_bucket);
  41
  42         return __bch2_bucket_nocow_trylock(l, dev_bucket, flags);
  43 }
  44
  45 void bch2_nocow_locks_to_text(struct printbuf *, struct bucket_nocow_lock_table *);
  46
  47 void bch2_fs_nocow_locking_exit(struct bch_fs *);
  48 int bch2_fs_nocow_locking_init(struct bch_fs *);
  49
  50 #endif /* _BCACHEFS_NOCOW_LOCKING_H */