commit 592bf4581264dcb7959359a93bbddd46d12794ab
author Song Liu <songliubraving@fb.com> Mon Nov 09 14:32:12 2015 -0800
committer Jens Axboe <axboe@fb.com> Mon Nov 09 15:54:39 2015 -0700
tree 7e15593be11f8debc68bc3f3f8a69646733dec8a
parent a77d139b089a5f4d0e25c24c61bba9076a32f64b

make sure __rand_0_1 does not return 0.0

Signed-off-by: Jens Axboe <axboe@fb.com>

lib/rand.h

diff --git a/lib/rand.h b/lib/rand.h
index 3d78115..a95bd28 100644
--- a/lib/rand.h
+++ b/lib/rand.h
@@ -109,11 +109,11 @@
 	if (state->use64) {
 		uint64_t val = __rand64(&state->state64);
 
-		return (double) val / (FRAND64_MAX + 1.0);
+		return (val + 1.0) / (FRAND64_MAX + 1.0);
 	} else {
 		uint32_t val = __rand32(&state->state32);
 
-		return (double) val / (FRAND32_MAX + 1.0);
+		return (val + 1.0) / (FRAND32_MAX + 1.0);
 	}
 }