linux-kernel - Re: [autofs] [PATCH 04/38] autofs4: Save autofs trigger's vfsmount in super block info

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Message-ID: <1277212283.2829.9.camel@localhost>
Date:	Tue, 22 Jun 2010 21:11:23 +0800
From:	Ian Kent <raven@...maw.net>
To:	"J. R. Okajima" <hooanon05@...oo.co.jp>
Cc:	Miklos Szeredi <miklos@...redi.hu>, viro@...iv.linux.org.uk,
	vaurora@...hat.com, autofs@...ux.kernel.org,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	linux-fsdevel@...r.kernel.org, jblunck@...e.de
Subject: Re: [autofs] [PATCH 04/38] autofs4: Save autofs trigger's vfsmount
 in super block info

On Tue, 2010-06-22 at 14:49 +0900, J. R. Okajima wrote:
> Ian Kent:
> > +static vfsmount *autofs4_find_vfsmount(struct path *parent, struct dentry *root)
> > +{
> > +	struct vfsmount *mnt = NULL;
> > +	struct dentry *child;
> > +
> > +	spin_lock(&dcache_lock);
> > +	list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) {
> 
> dentry->d_subdirs?
> parent->dentry->...?

Yep, thanks, cut and paste error.

Like I said, I don't want to go though the test process unless I have
something that is, in principal, OK.

If whatever approach we use is acceptable, and will work, then I'll put
the effort into it. I just don' want to spend a heap of time on
something that is basically not the right thing to do. For example,
exporting lookup_mnt?

> 
> Or how about iterate_mounts() instead of loop over dentries?
> For example (just a example),
> 
> struct args {
> 	/* input */
> 	struct dentry *root;
> 
> 	/* output */
> 	struct vfsmount *mnt;
> };
> 
> static int compare_mnt(struct vfsmount *mnt, void *arg)
> {
> 	struct args *a = arg;
> 
> 	if (mnt->mnt_root != a->root)
> 		return 0;
> 	a->mnt = mntget(mnt);
> 	return 1;
> }
> 
> struct vfsmount *autofs4_find_vfsmount(struct dentry *root)
> {
> 	int err;
> 	struct args args = {
> 		.root = root
> 	};
> 
> 	err = iterate_mounts(compare_mnt, &args, current->nsproxy->mnt_ns);
> }

Oh, I'm not up with this, I'll have to check this out, might be useful
for more than just this case, thanks for the comments.

Ian


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