From 3e87874d4e2e40e5f6218c35d72efa79dc234beb Mon Sep 17 00:00:00 2001
From: Xu Wang <59418106+xwang1498@users.noreply.github.com>
Date: Sat, 18 Jan 2025 17:44:27 -0500
Subject: [PATCH 1/2] store random seed for later recovery

---
 disk-filltest.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/disk-filltest.c b/disk-filltest.c
index 56c1c8c..e1747f9 100644
--- a/disk-filltest.c
+++ b/disk-filltest.c
@@ -260,6 +260,8 @@ void unlink_randfiles(void)
 
     if (filenum > 0)
         printf(" total: %u.\n", filenum);
+
+    unlink("random-seed");
 }
 
 /* fill disk */
@@ -288,6 +290,14 @@ void write_randfiles(void)
 
     printf("Writing files random-######## with seed %u\n", g_seed);
 
+    if (!gopt_unlink_immediate) {
+        FILE *fp = fopen("random-seed", "w");
+        if (fp != NULL) {
+            fprintf(fp, "%u", g_seed);
+            fclose(fp);
+        }
+    }
+
     while (!done && filenum < gopt_file_limit)
     {
         char filename[32], eta[64];

From 5cda1d6b34b33cc8b9cd11fab4cbc4040e201577 Mon Sep 17 00:00:00 2001
From: Xu Wang <59418106+xwang1498@users.noreply.github.com>
Date: Sat, 18 Jan 2025 17:44:59 -0500
Subject: [PATCH 2/2] read random seed from file when in readonly/verify mode

---
 disk-filltest.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/disk-filltest.c b/disk-filltest.c
index e1747f9..cd945f5 100644
--- a/disk-filltest.c
+++ b/disk-filltest.c
@@ -49,7 +49,7 @@
 #endif
 
 /* random seed used */
-unsigned int g_seed;
+unsigned int g_seed = 0;
 
 /* only perform read operation */
 int gopt_readonly = 0;
@@ -526,10 +526,20 @@ int main(int argc, char* argv[])
 {
     int r;
 
-    g_seed = time(NULL);
-
     parse_commandline(argc, argv);
 
+    if (gopt_readonly && !g_seed) {
+        FILE *fp = fopen("random-seed", "r");
+        if (fp != NULL) {
+            fscanf(fp, "%u", &g_seed);
+            fclose(fp);
+        }
+    }
+
+    if (!g_seed) {
+        g_seed = time(NULL);
+    }
+
     for (r = 0; r < gopt_repeat; ++r)
     {
         if (gopt_readonly)