From cfa816bf3f823a3bedfedd8e214ea929c5c755fe Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Sat, 24 Jun 2023 12:50:52 -0400 Subject: Update bcachefs sources to 84f132d569 bcachefs: fsck: Break walk_inode() up into multiple functions Signed-off-by: Kent Overstreet --- libbcachefs/seqmutex.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 libbcachefs/seqmutex.h (limited to 'libbcachefs/seqmutex.h') diff --git a/libbcachefs/seqmutex.h b/libbcachefs/seqmutex.h new file mode 100644 index 00000000..c1860d81 --- /dev/null +++ b/libbcachefs/seqmutex.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _BCACHEFS_SEQMUTEX_H +#define _BCACHEFS_SEQMUTEX_H + +#include + +struct seqmutex { + struct mutex lock; + u32 seq; +}; + +#define seqmutex_init(_lock) mutex_init(&(_lock)->lock) + +static inline bool seqmutex_trylock(struct seqmutex *lock) +{ + return mutex_trylock(&lock->lock); +} + +static inline void seqmutex_lock(struct seqmutex *lock) +{ + mutex_lock(&lock->lock); +} + +static inline void seqmutex_unlock(struct seqmutex *lock) +{ + lock->seq++; + mutex_unlock(&lock->lock); +} + +static inline u32 seqmutex_seq(struct seqmutex *lock) +{ + return lock->seq; +} + +static inline bool seqmutex_relock(struct seqmutex *lock, u32 seq) +{ + if (lock->seq != seq || !mutex_trylock(&lock->lock)) + return false; + + if (lock->seq != seq) { + mutex_unlock(&lock->lock); + return false; + } + + return true; +} + +#endif /* _BCACHEFS_SEQMUTEX_H */ -- cgit v1.2.3