From f5baaf48e3e82b1caf9f5cd1207d4d6feba3a2e5 Mon Sep 17 00:00:00 2001 From: Thomas Bertschinger Date: Mon, 15 Jan 2024 23:41:02 -0700 Subject: move Rust sources to top level, C sources into c_src This moves the Rust sources out of rust_src/ and into the top level. Running the bcachefs executable out of the development tree is now: $ ./target/release/bcachefs command or $ cargo run --profile release -- command instead of "./bcachefs command". Building and installing is still: $ make && make install Signed-off-by: Thomas Bertschinger Signed-off-by: Kent Overstreet --- c_src/include/linux/seqlock.h | 47 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 c_src/include/linux/seqlock.h (limited to 'c_src/include/linux/seqlock.h') diff --git a/c_src/include/linux/seqlock.h b/c_src/include/linux/seqlock.h new file mode 100644 index 00000000..435420fe --- /dev/null +++ b/c_src/include/linux/seqlock.h @@ -0,0 +1,47 @@ +#ifndef __LINUX_SEQLOCK_H +#define __LINUX_SEQLOCK_H + +#include + +typedef struct seqcount { + unsigned sequence; +} seqcount_t; + +static inline void seqcount_init(seqcount_t *s) +{ + s->sequence = 0; +} + +static inline unsigned read_seqcount_begin(const seqcount_t *s) +{ + unsigned ret; + +repeat: + ret = READ_ONCE(s->sequence); + if (unlikely(ret & 1)) { + cpu_relax(); + goto repeat; + } + smp_rmb(); + return ret; +} + +static inline int read_seqcount_retry(const seqcount_t *s, unsigned start) +{ + smp_rmb(); + return unlikely(s->sequence != start); +} + +static inline void write_seqcount_begin(seqcount_t *s) +{ + s->sequence++; + smp_wmb(); +} + +static inline void write_seqcount_end(seqcount_t *s) +{ + smp_wmb(); + s->sequence++; +} + +#endif /* __LINUX_SEQLOCK_H */ -- cgit v1.2.3