Re: Linux 2.4.33-rc1

[Grant Coady <gcoady.lk@gmail.com>]

On Mon, 19 Jun 2006 10:06:51 +0200, Willy Tarreau <w@1wt.eu> wrote:

>Hi Grant,
>
>OK, it does *really* crash in vfs_unlink(), during the double_up on
>dentry->inode-i_zombie (dentry->inode = NULL).
>
>I suggest the following fix, I hope that it is correct and is not subject
>to any race condition :
>
>--- ./fs/namei.c.orig	2006-06-19 09:39:52.000000000 +0200
>+++ ./fs/namei.c	2006-06-19 09:51:09.000000000 +0200
>@@ -1478,12 +1478,14 @@
> int vfs_unlink(struct inode *dir, struct dentry *dentry)
> {
> 	int error;
>+	struct inode *inode;
> 
> 	error = may_delete(dir, dentry, 0);
> 	if (error)
> 		return error;
> 
>-	double_down(&dir->i_zombie, &dentry->d_inode->i_zombie);
>+	inode = dentry->d_inode;
>+	double_down(&dir->i_zombie, &inode->i_zombie);
> 	error = -EPERM;
> 	if (dir->i_op && dir->i_op->unlink) {
> 		DQUOT_INIT(dir);
>@@ -1495,7 +1497,7 @@
> 			unlock_kernel();
> 		}
> 	}
>-	double_up(&dir->i_zombie, &dentry->d_inode->i_zombie);
>+	double_up(&dir->i_zombie, &inode->i_zombie);
> 	if (!error) {
> 		d_delete(dentry);
> 		inode_dir_notify(dir, DN_DELETE);
>
>I think it will *not* oops anymore with this fix, but I'd like someone to
>review it to ensure that it is valid.

Strangely, the /etc/lilo.conf~ is as expected on a different box, 
500MHz Celeron (Coppermine) + PATA HDD okay, whereas the Sempron 
SktA 2600+ with SATA HDD has something munch a couple chars off 
a filename during whatever vim does to make its backup file.

Grant.
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