Fix file system racing and ext2 directory insertion (#58)

[lunaix-os.git] / lunaix-os / usr / fragfile.c

diff --git a/lunaix-os/usr/fragfile.c b/lunaix-os/usr/fragfile.c
new file mode 100644 (file)
index 0000000..a67b94a
--- /dev/null
+++ b/lunaix-os/usr/fragfile.c
@@ -0,0 +1,71 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <lunaix/status.h>
+
+static char alphabets[] = "abcdefghijklmnopqrstuvwxyz"
+                          "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                          "01234567890";
+
+#define NR_BUFSIZE   4096
+#define NR_NAME_LEN  8
+#define NR_REPEAT    5
+
+int main()
+{
+    unsigned int buf[NR_BUFSIZE];
+    char name[NR_NAME_LEN + 1];
+    int fd = open("/dev/rand", O_RDONLY);
+
+    if (mkdir("testdir") && errno != EEXIST)
+    {
+        printf("Unable to mkdir %d\n", errno);
+        _exit(1);
+    }
+
+    if (chdir("testdir"))
+    {
+        printf("Unable to chdir %d\n", errno);
+        _exit(1);
+    }
+
+    int nr_total = NR_REPEAT * NR_BUFSIZE / NR_NAME_LEN;
+
+    int cnt = 0;
+    for (int i = 0; i < NR_REPEAT; i++)
+    {
+        int n = read(fd, buf, 4096 * sizeof(int));
+        int j = 0, k = 0;
+        while (j < 4096) {
+            name[k++] = alphabets[buf[j++] % 63];
+
+            if (k < NR_NAME_LEN) {
+                continue;
+            }
+
+            k = 0;
+            cnt++;
+            name[NR_NAME_LEN] = 0;
+
+            printf("[%04d/%04d] creating: %s\r", cnt, nr_total, name);
+            int fd2 = open(name, O_RDONLY | O_CREAT);
+            
+            if (fd2 < 0) 
+            {
+                printf("\n");
+                if (errno == EDQUOT) {
+                    printf("Out of quota\n");
+                    return 0;
+                }
+
+                printf("Unable to open %d\n", errno);
+                continue;
+            }
+
+            close(fd2);
+        }
+    }
+    printf("\n");
+    return 0;
+}
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