diff options
author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-06-24 12:50:52 -0400 |
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committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-06-27 19:38:18 -0400 |
commit | cfa816bf3f823a3bedfedd8e214ea929c5c755fe (patch) | |
tree | 561ac156481ffbd82cb9698b6994f6d028fc0b9a /libbcachefs/seqmutex.h | |
parent | 84cb7bffe5e80ef9036213bbfbaf358d478536be (diff) |
Update bcachefs sources to 84f132d569 bcachefs: fsck: Break walk_inode() up into multiple functions
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'libbcachefs/seqmutex.h')
-rw-r--r-- | libbcachefs/seqmutex.h | 48 |
1 files changed, 48 insertions, 0 deletions
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 <linux/mutex.h> + +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 */ |