Re: [PATCH 5/5] libfs : file/directory removal fix, 2.6.18

From: Mathieu Desnoyers
Date: Thu Nov 23 2006 - 12:28:54 EST


* Al Viro (viro@xxxxxxxxxxxxxxxx) wrote:
> On Thu, Nov 23, 2006 at 08:50:56AM +0000, Al Viro wrote:
> > On Thu, Nov 23, 2006 at 03:22:44AM -0500, Mathieu Desnoyers wrote:
> > > Fix file and directory removal in libfs. Add inotify support for file removal.
> > >
> > > The following scenario :
> > > create dir a
> > > create dir a/b
> > >
> > > cd a/b (some process goes in cwd a/b)
> > >
> > > rmdir a/b
> > > rmdir a
> > >
> > > fails due to the fact that "a" appears to be non empty.
> >
> > What? Caller will do d_delete() itself. Care to show a version where
> > that would happen and post an strace of the second rmdir?
> >
> > > It is because the "b"
> > > dentry is not deleted from "a" and still in use. The same problem happens if
> > > "b" is a file. d_delete is nice enough to know when it needs to unhash and free
> > > the dentry if nothing else is using it or, if someone is using it, to remove it
> > > from the hash queues and wait for it to be deleted when it has no users.
> > >
> > > The nice side-effect of this fix is that it calls the file removal
> > > notification.
> >
> > NAK. First of all, I won't believe you without actual strace.
> >
> > What's more, WTF would fs _method_ call idiotify? Keep that crap
> > out of filesystems; caller will do it for us just fine.
>
> PS: debugfs, sysfs et sodding alia should take care to do things equivalent
> to vfs_unlink(), etc. _That_ is definitive user of fs methods, which, in
> turn, sets the rules for library helpers used by such.
>

Ok, I will tweak my modification so it sits in debugfs then.

Thanks,

Mathieu

OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/