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 */
51
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