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