When verify fails, dump the good/bad blocks to files

This makes it easy to compare afterwards to see what kind of
corruption was experienced.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

2 files changed, 17 insertions, 9 deletions

diff --git a/lib/rand.c b/lib/rand.c
index 839a6a94..06812823 100644
--- a/lib/rand.c
+++ b/lib/rand.c
@@ -59,18 +59,25 @@ void init_rand(struct frand_state *state)
 	__rand(state);
 }
 
-void fill_random_buf(void *buf, unsigned int len)
+void __fill_random_buf(void *buf, unsigned int len, unsigned long seed)
 {
-	unsigned long r = __rand(&__fio_rand_state);
 	long *ptr = buf;
 
-	if (sizeof(int) != sizeof(*ptr))
-		r *= (unsigned long) __rand(&__fio_rand_state);
-
 	while ((void *) ptr - buf < len) {
-		*ptr = r;
+		*ptr = seed;
 		ptr++;
-		r *= GOLDEN_RATIO_PRIME;
-		r >>= 3;
+		seed *= GOLDEN_RATIO_PRIME;
+		seed >>= 3;
 	}
 }
+
+unsigned long fill_random_buf(void *buf, unsigned int len)
+{
+	unsigned long r = __rand(&__fio_rand_state);
+
+	if (sizeof(int) != sizeof(long *))
+		r *= (unsigned long) __rand(&__fio_rand_state);
+
+	__fill_random_buf(buf, len, r);
+	return r;
+}
diff --git a/lib/rand.h b/lib/rand.h
index 573116cb..02e68585 100644
--- a/lib/rand.h
+++ b/lib/rand.h
@@ -19,6 +19,7 @@ static inline unsigned int __rand(struct frand_state *state)
 }
 
 extern void init_rand(struct frand_state *);
-extern void fill_random_buf(void *buf, unsigned int len);
+extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed);
+extern unsigned long fill_random_buf(void *buf, unsigned int len);
 
 #endif