linux-kernel - Re: [RFC][PATCH 8/14] Union-mount lookup

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Message-ID: <20070516200647.GA8961@sergelap.austin.ibm.com>
Date:	Wed, 16 May 2007 15:06:47 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Jan Blunck <j.blunck@...harburg.de>
Subject: Re: [RFC][PATCH  8/14] Union-mount lookup

Quoting Jan Engelhardt (jengelh@...ux01.gwdg.de):
> 
> On May 16 2007 10:38, Bharata B Rao wrote:
> >> 
> >> >+lookup_union:
> >> >+	do {
> >> >+		struct vfsmount *mnt = find_mnt(topmost);
> >> >+		UM_DEBUG_DCACHE("name=\"%s\", inode=%p, device=%s\n",
> >> >+				topmost->d_name.name, topmost->d_inode,
> >> >+				mnt->mnt_devname);
> >> >+		mntput(mnt);
> >> >+	} while (0);
> >> 
> >> Why the extra do{}while? [elsewhere too]
> >
> >Not sure, may be to get a scope to define 'mnt' here. Jan ?
> 
> What I was implicitly suggesting that mnt could be moved into the
> normal 'function scope'.
> 
> 
> 	Jan

This code can't stay anyway so it's kind of moot.  find_mnt() is bogus,
and the topmost and overlaid mappings need to be changed from
dentry->dentry to (vfsmnt,dentry)->(vfsmnt,dentry) in order to cope with
bind mounts and mount namespaces.

-serge
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