On Sat, 15 Apr 2000, Russell King wrote:
> After bootup, if I do the following:
>
> (login as root)
> # shutdown -t3 now
> (wait for single user, kill off minilogd and kerneld if running - why kerneld???)
Ask yourself - your box, your rc scripts...
> # ps ax
> -> shows init, kswapd, kflushd, kupdate, init, /bin/sh and ps ax running
? init shown twice?
> # umount -av
> none umounted
> none umounted
> /dev/hda6 umounted
> /dev/hda5 umounted
> umount: /var: device is busy
> /dev/hda1 umounted
Huh? What about more verbose output?
> # mount
> /dev/hda1 on / type ext2 (rw)
> none on /proc type proc (rw)
> /dev/hda3 on /var type ext2 (rw)
> # ls -al /proc/*/fd
> (does not show anything located in /var)
> # echo 1 > /proc/sys/kernel/sysrq
> SysRq: Emergency Remount R/O
> Remounting device 03:01 ... R/O
> Remounting device 03:03 ... OK
> Done.
> # umount /var
> umount: /var: device is busy
Urgh. What about doing the following trick: in fs/super.c::do_umount(),
after shrink_dcache() insert
{
struct dentry *root = sb->s_root;
static char buf[4096];
struct dentry *this_parent = root;
struct list_head *next;
int count = root->d_count;
repeat:
next = this_parent->d_subdirs.next;
resume:
while (next != &this_parent->d_subdirs) {
struct list_head *tmp = next;
struct dentry *dentry = list_entry(tmp, struct dentry, d_child);
next = tmp->next;
/* Decrement count for unused children */
count += (dentry->d_count - 1);
if (!list_empty(&dentry->d_subdirs)) {
this_parent = dentry;
goto repeat;
}
/* root is busy if any leaf is busy */
if (dentry->d_count)
printk("umount: busy (%s)\n", __d_path(dentry, NULL, root, NULL, buf, 4096));
}
/*
* All done at this level ... ascend and resume the search.
*/
if (this_parent != root) {
next = this_parent->d_child.next;
this_parent = this_parent->d_parent;
goto resume;
}
}
and see what it will tell you on umount.
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This archive was generated by hypermail 2b29 : Sat Apr 15 2000 - 21:00:26 EST