Allow offload with FAKEIO engines

[fio.git] / lib / seqlock.h

diff --git a/lib/seqlock.h b/lib/seqlock.h
index 1ac1eb6bdea47cc5cd7647ca4610d1fc6ca0032f..56f3e37dab5b35750a390714c3af2d9579de5628 100644 (file)
--- a/lib/seqlock.h
+++ b/lib/seqlock.h
@@ -1,10 +1,11 @@
 #ifndef FIO_SEQLOCK_H
 #define FIO_SEQLOCK_H
 
+#include "types.h"
 #include "../arch/arch.h"
 
 struct seqlock {
-       volatile int sequence;
+       volatile unsigned int sequence;
 };
 
 static inline void seqlock_init(struct seqlock *s)
@@ -17,13 +18,12 @@ static inline unsigned int read_seqlock_begin(struct seqlock *s)
        unsigned int seq;
 
        do {
-               seq = s->sequence;
+               seq = atomic_load_acquire(&s->sequence);
                if (!(seq & 1))
                        break;
                nop;
        } while (1);
 
-       read_barrier();
        return seq;
 }
 
@@ -35,14 +35,12 @@ static inline bool read_seqlock_retry(struct seqlock *s, unsigned int seq)
 
 static inline void write_seqlock_begin(struct seqlock *s)
 {
-       s->sequence++;
-       write_barrier();
+       s->sequence = atomic_load_acquire(&s->sequence) + 1;
 }
 
 static inline void write_seqlock_end(struct seqlock *s)
 {
-       write_barrier();
-       s->sequence++;
+       atomic_store_release(&s->sequence, s->sequence + 1);
 }
 
 #endif