X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;ds=sidebyside;f=lib%2Frand.c;h=618a2f06349dbc90389971b8720c9ea067024e28;hb=a893c26129358a934767a92d487510c87c81dde8;hp=3b2d67ad6e9ebc4a242b24c162f94aa667a11743;hpb=2615cc4b28e7d0e436a625dff92e6a71ccc6c49b;p=fio.git

diff --git a/lib/rand.c b/lib/rand.c
index 3b2d67ad..618a2f06 100644
--- a/lib/rand.c
+++ b/lib/rand.c
@@ -33,11 +33,11 @@
 
 */
 
+#include <string.h>
+#include <assert.h>
 #include "rand.h"
 #include "../hash.h"
 
-struct frand_state __fio_rand_state;
-
 static inline int __seed(unsigned int x, unsigned int m)
 {
 	return (x < m) ? x + m : x;
@@ -79,13 +79,99 @@ void __fill_random_buf(void *buf, unsigned int len, unsigned long seed)
 	}
 }
 
-unsigned long fill_random_buf(void *buf, unsigned int len)
+unsigned long fill_random_buf(struct frand_state *fs, void *buf,
+			      unsigned int len)
 {
-	unsigned long r = __rand(&__fio_rand_state);
+	unsigned long r = __rand(fs);
 
 	if (sizeof(int) != sizeof(long *))
-		r *= (unsigned long) __rand(&__fio_rand_state);
+		r *= (unsigned long) __rand(fs);
 
 	__fill_random_buf(buf, len, r);
 	return r;
 }
+
+void fill_pattern(void *p, unsigned int len, char *pattern,
+		  unsigned int pattern_bytes)
+{
+	switch (pattern_bytes) {
+	case 0:
+		assert(0);
+		break;
+	case 1:
+		memset(p, pattern[0], len);
+		break;
+	default: {
+		unsigned int i = 0, size = 0;
+		unsigned char *b = p;
+
+		while (i < len) {
+			size = pattern_bytes;
+			if (size > (len - i))
+				size = len - i;
+			memcpy(b+i, pattern, size);
+			i += size;
+		}
+		break;
+		}
+	}
+}
+
+void __fill_random_buf_percentage(unsigned long seed, void *buf,
+				  unsigned int percentage,
+				  unsigned int segment, unsigned int len,
+				  char *pattern, unsigned int pbytes)
+{
+	unsigned int this_len;
+
+	if (percentage == 100) {
+		if (pbytes)
+			fill_pattern(buf, len, pattern, pbytes);
+		else
+			memset(buf, 0, len);
+		return;
+	}
+
+	if (segment > len)
+		segment = len;
+
+	while (len) {
+		/*
+		 * Fill random chunk
+		 */
+		this_len = (segment * (100 - percentage)) / 100;
+		if (this_len > len)
+			this_len = len;
+
+		__fill_random_buf(buf, this_len, seed);
+
+		len -= this_len;
+		buf += this_len;
+
+		if (this_len > len)
+			this_len = len;
+
+		if (pbytes)
+			fill_pattern(buf, this_len, pattern, pbytes);
+		else
+			memset(buf, 0, this_len);
+
+		len -= this_len;
+		buf += this_len;
+	}
+}
+
+unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
+					 unsigned int percentage,
+					 unsigned int segment, unsigned int len,
+					 char *pattern, unsigned int pbytes)
+{
+	unsigned long r = __rand(fs);
+
+	if (sizeof(int) != sizeof(long *))
+		r *= (unsigned long) __rand(fs);
+
+	__fill_random_buf_percentage(r, buf, percentage, segment, len,
+					pattern, pbytes);
+	return r;
+}