Missing standart /proc entries after adding new ones

["M.Baris Demiray" <baris@xxxxxxxxxxxxxxxxxx>]

Hi,
i'm playing with procfs API and added a few lines into kernel/fork.c
to show the latest process' pid in the /proc/newbie/last_pid entry
as an example (modifications are at the end).

But i've a problem as you can see in the shell output below. last_pid
shows the latest PID without a problem but the standart proc entries
like /proc/{cpuinfo,cmdline,...} dissapear after booting the modified
kernel.

root@emektar:~# cat /proc/newbie/last_pid
Last created process' PID is 914
root@emektar:~# updatedb &
[1] 915
root@emektar:~# ls /proc/[a-z]*
newbie  self

Anybody could tell me what i am missing, please?

Regards

--- /dev/null   1994-07-18 02:46:18.000000000 +0300
+++ include/linux/newbie.h      2005-02-04 22:05:50.000000000 +0200
@@ -0,0 +1,16 @@
+#ifndef _LINUX_NEWBIE_H
+#define _LINUX_NEWBIE_H
+
+/*
+ * Newbie test structures and functions
+ */
+
+static int
+proc_read_last_pid(char *page, char **start,
+                  off_t offset, int count,
+                  int *eof, void *data)
+{
+       return sprintf(page, "Last created process' PID is %d\n", *(int 
*)data);
+}
+
+#endif /* _LINUX_NEWBIE_H */


--- kernel/fork.c.orig  2005-02-04 20:56:25.000000000 +0200
+++ kernel/fork.c       2005-02-04 22:37:59.000000000 +0200
@@ -22,6 +22,8 @@
 #include <linux/namespace.h>
 #include <linux/personality.h>
 #include <linux/compiler.h>
+#include <linux/proc_fs.h>
+#include <linux/newbie.h>

 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -650,6 +652,7 @@
        int retval;
        struct task_struct *p;
        struct completion vfork;
+       struct proc_dir_entry *last_pid_dir, *last_pid_root;

        if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == 
(CLONE_NEWNS|CLONE_FS))
                return -EINVAL;
@@ -709,6 +712,18 @@
        if (p->pid == 0 && current->pid != 0)
                goto bad_fork_cleanup;

+       /*
+        * Create a /proc entry containing the
+        * PID of newly created process
+        */
+       if (!(last_pid_root = proc_mkdir("newbie", NULL))) {
+               printk(KERN_WARNING "Cannot create /proc/newbie root\n");
+       }
+       if (!(last_pid_dir = create_proc_read_entry("last_pid", 0444, 
last_pid_root, \
+                                                   proc_read_last_pid, 
&p->pid)))  {
+               printk(KERN_WARNING "Cannot create /proc/newbie entry\n");
+       }
+
        p->run_list.next = NULL;
        p->run_list.prev = NULL;


--
M.Baris Demiray

DOS: n., A small annoying boot virus that causes random spontaneous
system crashes, usually just before saving a massive project.
Easily cured by UNIX. See also MS-DOS, IBM-DOS, DR-DOS.

----
You have to understand, most of these people are not ready to be
unplugged. And many of them are no inert, so hopelessly dependent
on the system, that they will fight to protect it."
                                                          Morpheus

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