Add verify_pattern option

[fio.git] / verify.c

diff --git a/verify.c b/verify.c
index d98dfcf4c52b8bd5a43411bb2cf8397c6fd0952d..5770b46112270252696a25575a21e14caaf07b44 100644 (file)
--- a/verify.c
+++ b/verify.c
@@ -8,8 +8,7 @@
 
 #include "fio.h"
 
-static void fill_random_bytes(struct thread_data *td,
-                             void *p, unsigned int len)
+static void fill_random_bytes(struct thread_data *td, void *p, unsigned int len)
 {
        unsigned int todo;
        int r;
@@ -32,9 +31,52 @@ static void fill_random_bytes(struct thread_data *td,
        }
 }
 
-void memswp(void* buf1, void* buf2, unsigned int len)
+static void fill_pattern(struct thread_data *td, void *p, unsigned int len)
+{
+       switch (td->o.verify_pattern_bytes) {
+       case 0:
+               fill_random_bytes(td, p, len);
+               break;
+       case 1:
+               memset(p, td->o.verify_pattern, len);
+               break;
+       case 2:
+       case 3:
+       case 4: {
+               unsigned int pattern = td->o.verify_pattern;
+               unsigned int i = 0;
+               unsigned char c1, c2, c3, c4;
+               unsigned char *b = p;
+
+               c1 = pattern & 0xff;
+               pattern >>= 8;
+               c2 = pattern & 0xff;
+               pattern >>= 8;
+               c3 = pattern & 0xff;
+               pattern >>= 8;
+               c4 = pattern & 0xff;
+
+               while (i < len) {
+                       b[i++] = c1;
+                       if (i == len)
+                               break;
+                       b[i++] = c2;
+                       if (td->o.verify_pattern_bytes == 2 || i == len)
+                               continue;
+                       b[i++] = c3;
+                       if (td->o.verify_pattern_bytes == 3 || i == len)
+                               continue;
+                       b[i++] = c4;
+               }
+               break;
+               }
+       }
+}
+
+static void memswp(void* buf1, void* buf2, unsigned int len)
 {
        struct verify_header swap;
+
        memcpy(&swap, buf1, len);
        memcpy(buf1, buf2, len);
        memcpy(buf2, &swap, len);
@@ -254,7 +296,7 @@ void populate_verify_io_u(struct thread_data *td, struct io_u *io_u)
        if (td->o.verify == VERIFY_NULL)
                return;
 
-       fill_random_bytes(td, p, io_u->buflen);
+       fill_pattern(td, p, io_u->buflen);
 
        hdr_inc = io_u->buflen;
        if (td->o.verify_interval)