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stressfs.c

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+// Demonstrate that moving the "acquire" in iderw after the loop that
+// appends to the idequeue results in a race.
+
+// For this to work, you should also add a spin within iderw's
+// idequeue traversal loop.  Adding the following demonstrated a panic
+// after about 5 runs of stressfs in QEMU on a 2.1GHz CPU:
+//    for (i = 0; i < 40000; i++)
+//      asm volatile("");
+
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "fs.h"
+#include "fcntl.h"
+
+int main(int argc, char *argv[])  {
+    int fd, i;
+    char path[] = "stressfs0";
+    char data[512];
+
+    printf(1, "stressfs starting\n");
+    memset(data, 'a', sizeof(data));
+
+    for (i = 0; i < 4; i++) {
+        if (fork() > 0) {
+            break;
+        }
+    }
+
+    printf(1, "write %d\n", i);
+
+    path[8] += i;
+    fd = open(path, O_CREATE | O_RDWR);
+    for (i = 0; i < 20; i++) {
+//    printf(fd, "%d\n", i);
+        write(fd, data, sizeof(data));
+    }
+    close(fd);
+
+    printf(1, "read\n");
+
+    fd = open(path, O_RDONLY);
+    for (i = 0; i < 20; i++) {
+        read(fd, data, sizeof(data));
+    }
+    close(fd);
+
+    wait();
+
+    exit();
+}