linux-kernel - Re: [patch 01/10] vfs: add path_create() and path

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Date:	Mon, 5 May 2008 22:46:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Miklos Szeredi <miklos@...redi.hu>, hch@...radead.org,
	dave@...ux.vnet.ibm.com, ezk@...sunysb.edu, mhalcrow@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: Re: [patch 01/10] vfs: add path_create() and path_mknod()

On Tue, 6 May 2008 05:24:26 +0100 Al Viro <viro@...IV.linux.org.uk> wrote:

> On Mon, May 05, 2008 at 09:12:51PM -0700, Andrew Morton wrote:
> > On Mon, 05 May 2008 12:16:22 +0200 Miklos Szeredi <miklos@...redi.hu> wrote:
> > 
> > > R/O bind mounts require operations which modify the filesystem to be
> > > wrapped in mnt_want_write()/mnt_drop_write().  Create helpers which do
> > > this, so callers won't need to bother, and more importantly, cannot
> > > forget!  Call these path_*, analogous to vfs_*.  Since there are no
> > > callers of vfs_* left, make them static.
> > 
> > ooh, yum.  This appears to address my main complaint about the r-o-bind-mount
> > stuff: fragility.
> > 
> > > Overall this patchset is just 23 lines in the red, but at the same
> > > time it fixes several places in nfsd and the whole of ecryptfs, where
> > > the mnt_want_write/drop_write() calls were missing.
> > 
> > Yeah, like that.
> 
> Except that it fixes nothing in nfsd, as we'd already figured out and
> "solution" for ecryptfs is more than slightly dubious.  Not that nfsd
> one wasn't...

Well OK.  But those open-coded mnt_want_write() calls all over the place
still stink.

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