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Subject[HACK][CFT] procfs without processes.
	Folks, if somebody is still interested in mounting the
process-less subset of procfs (everything except /proc/<PID>/*) - try the
patchlet below. It makes (quite arbitrary) -o nodiratime option to give
such behaviour on procfs (changing the choice of option is the matter of
s/IS_NODIRATIME/whatever_you_want/)
Patch is against -pre2. Feedback is welcome, indeed.
Cheers,
Al

diff -urN linux-2.3.52-pre2/fs/proc/inode.c linux-bird.vfs/fs/proc/inode.c
--- linux-2.3.52-pre2/fs/proc/inode.c Sat Mar 11 01:33:10 2000
+++ linux-bird.vfs/fs/proc/inode.c Mon Mar 13 12:25:14 2000
@@ -212,12 +212,14 @@
root_inode = proc_get_inode(s, PROC_ROOT_INO, &proc_root);
if (!root_inode)
goto out_no_root;
- /*
- * Fixup the root inode's nlink value
- */
- read_lock(&tasklist_lock);
- for_each_task(p) if (p->pid) root_inode->i_nlink++;
- read_unlock(&tasklist_lock);
+ if (!IS_NODIRATIME(root_inode)) {
+ /*
+ * Fixup the root inode's nlink value
+ */
+ read_lock(&tasklist_lock);
+ for_each_task(p) if (p->pid) root_inode->i_nlink++;
+ read_unlock(&tasklist_lock);
+ }
s->s_root = d_alloc_root(root_inode);
if (!s->s_root)
goto out_no_root;
diff -urN linux-2.3.52-pre2/fs/proc/root.c linux-bird.vfs/fs/proc/root.c
--- linux-2.3.52-pre2/fs/proc/root.c Tue Mar 7 18:19:14 2000
+++ linux-bird.vfs/fs/proc/root.c Mon Mar 13 12:16:14 2000
@@ -80,6 +80,9 @@
{
struct task_struct *p;

+ if (IS_NODIRATIME(dir))
+ return proc_lookup(dir, dentry);
+
if (dir->i_ino == PROC_ROOT_INO) { /* check for safety... */
extern unsigned long total_forks;
static int last_timestamp = 0;
@@ -123,8 +126,9 @@
return error;
filp->f_pos = FIRST_PROCESS_ENTRY;
}
-
- return proc_pid_readdir(filp, dirent, filldir);
+ if (!IS_NODIRATIME(filp->f_dentry->d_inode))
+ return proc_pid_readdir(filp, dirent, filldir);
+ return 0;
}

/*

-
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