linux-kernel - Re: Where's the create() pointer?

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Message-ID: <20080120033146.GA6744@bleen.domain.actdsltmp>
Date:	Sat, 19 Jan 2008 20:31:46 -0700
From:	Justin Banks <justinb@...bone.com>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	Justin Banks <justinb@...bone.com>, linux-kernel@...r.kernel.org
Subject: Re: Where's the create() pointer?

Trond Myklebust wrote
> 
> On Sat, 2008-01-19 at 12:02 -0700, Justin Banks wrote:
> > Trond Myklebust wrote
> > > 
> > > On Sat, 2008-01-19 at 08:07 -0700, Justin Banks wrote:
> > > > It's probably been this way for a long time, and I'm just noticing, but
> > > > I can't seem to find the create() (among others) pointer for NFS filesystems.
> > > > 
> > > > Specifically, If I look at sb->s_root->d_inode->i_op there's no create
> > > > there. How do I find it? I'm guessing that the ability to share mount
> > > > structures between multiple NFS mounts resulted in some kind of fake
> > > > superblock, but I just can't figure out where to find the functions.
> > > 
> > > Why would you want to do this in the first place?
> > 
> > I'm just looking at trapping new creates on NFS, and so I need to find
> > the pointer.
> 
> What is your purpose in trapping creates on the client? Is this for
> accounting purposes? If so, why wouldn't inotify, or even a systemtap
> script suffice?

Could do inotify, except on a large-ish filesystem, it's really
unuseable, if you want to track everything that's going on.

> Anyhow, the simplest way to find the pointer is to grep for nfs_create
> in /proc/kallsyms.

Ugh. That's an ugly way, seems to me. Isn't there a way, given the
superblock? I mean, the VFS does it that way, doesn't it?

-justinb

-- 
Justin Banks
BakBone Software
justinb@...bone.com
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