linux-kernel - Re: [PATCH 14/22] NFS: Use local caching

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Date:	Sat, 22 Sep 2007 00:37:26 +0100
From:	David Howells <dhowells@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	dhowells@...hat.com, Peter Staubach <staubach@...hat.com>,
	viro@....linux.org.uk, hch@...radead.org,
	Trond.Myklebust@...app.com, sds@...ho.nsa.gov,
	casey@...aufler-ca.com, linux-kernel@...r.kernel.org,
	selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 14/22] NFS: Use local caching

David Howells <dhowells@...hat.com> wrote:

> Peter Staubach <staubach@...hat.com> wrote:
> 
> > Did I miss the section where the modified semantics about which
> > mounted file systems can use the cache and which ones can not
> > was implemented?
> 
> Yes.

fs/nfs/super.c:

		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			mnt->options &= ~NFS_OPTION_FSCACHE;
			break;
		case Opt_fscache:
			/* sharing is mandatory with fscache */
			mnt->options |= NFS_OPTION_FSCACHE;
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nofscache:
			mnt->options &= ~NFS_OPTION_FSCACHE;
			break;

Hmmm...  Actually, I'm not sure this is sufficient.

David
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