linux-kernel - Re: [PATCH 1/11] LTTng-core 0.5.111 : Relay+DebugFS (DebugFS fix)

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Date:	Wed, 20 Sep 2006 08:21:30 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Douglas Niehaus <niehaus@...s.ku.edu>
Subject: Re: [PATCH 1/11] LTTng-core 0.5.111 : Relay+DebugFS (DebugFS fix)

* Greg KH (gregkh@...e.de) wrote:
> On Sat, Sep 16, 2006 at 03:51:03AM -0400, Mathieu Desnoyers wrote:
> > 1 - DebugFS stalled dentry patch
> > DebugFS seems to keep a stalled dentry when a process is in a directory that is
> > being removed. Force a differed deletion.
> > patch-2.6.17-lttng-core-0.5.111-debugfs.diff
> > 
> > 
> > OpenPGP public key:              http://krystal.dyndns.org:8080/key/compudj.gpg
> > Key fingerprint:     8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68 
> 
> > --- a/fs/debugfs/inode.c
> > +++ b/fs/debugfs/inode.c
> > @@ -266,6 +266,7 @@ EXPORT_SYMBOL_GPL(debugfs_create_dir);
> >  void debugfs_remove(struct dentry *dentry)
> >  {
> >  	struct dentry *parent;
> > +	int ret = 0;
> >  	
> >  	if (!dentry)
> >  		return;
> > @@ -278,9 +279,10 @@ void debugfs_remove(struct dentry *dentr
> >  	if (debugfs_positive(dentry)) {
> >  		if (dentry->d_inode) {
> >  			if (S_ISDIR(dentry->d_inode->i_mode))
> > -				simple_rmdir(parent->d_inode, dentry);
> > +				ret = simple_rmdir(parent->d_inode, dentry);
> >  			else
> > -				simple_unlink(parent->d_inode, dentry);
> > +				ret = simple_unlink(parent->d_inode, dentry);
> > +			if(ret) d_delete(dentry);
> 
> Are you saying that perhaps all other users of simple_unlink() are also
> broken like this?  If so, why not just fix simple_unlink()?
> 

I don't think that libfs is fundamentally broken, as simple_unlink always
returns 0 but simple_rmdir may fail if !simple_empty(dentry). I think that the
decision of what to do in such situation is "simply" left to the caller.

But you probably know more than I do on that matter.

Mathieu



OpenPGP public key:              http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint:     8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68 
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