linux-kernel - Re: [patch 21/26] mount options: partially fix nfs

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Message-Id: <1201208010.7054.17.camel@heimdal.trondhjem.org>
Date:	Thu, 24 Jan 2008 15:53:30 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 21/26] mount options: partially fix nfs

On Thu, 2008-01-24 at 20:34 +0100, Miklos Szeredi wrote:
> plain text document attachment (nfs_opts.patch)
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> Add posix, bsize=, namelen= options to /proc/mounts for nfs
> filesystems.
> 
> Document several other options that are still missing.
> 
> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
> ---
> 
> Index: linux/fs/nfs/super.c
> ===================================================================
> --- linux.orig/fs/nfs/super.c	2008-01-19 11:56:34.000000000 +0100
> +++ linux/fs/nfs/super.c	2008-01-21 20:41:30.000000000 +0100
> @@ -449,6 +449,7 @@ static void nfs_show_mount_options(struc
>  	} nfs_info[] = {
>  		{ NFS_MOUNT_SOFT, ",soft", ",hard" },
>  		{ NFS_MOUNT_INTR, ",intr", ",nointr" },
> +		{ NFS_MOUNT_POSIX, ",posix", "" },
>  		{ NFS_MOUNT_NOCTO, ",nocto", "" },
>  		{ NFS_MOUNT_NOAC, ",noac", "" },
>  		{ NFS_MOUNT_NONLM, ",nolock", "" },
> @@ -459,10 +460,17 @@ static void nfs_show_mount_options(struc
>  	};
>  	const struct proc_nfs_info *nfs_infop;
>  	struct nfs_client *clp = nfss->nfs_client;
> +	unsigned int default_namelen =
> +		clp->rpc_ops->version == 4 ? NFS4_MAXNAMLEN :
> +		clp->rpc_ops->version == 3 ? NFS3_MAXNAMLEN : NFS2_MAXNAMLEN;
>  	seq_printf(m, ",vers=%d", clp->rpc_ops->version);
>  	seq_printf(m, ",rsize=%d", nfss->rsize);
>  	seq_printf(m, ",wsize=%d", nfss->wsize);
> +	if (nfss->bsize != 0)
> +		seq_printf(m, ",bsize=%d", nfss->bsize);
> +	if (nfss->namelen != default_namelen)
> +		seq_printf(m, ",namelen=%d", nfss->namelen);

You really just want to look at the value of nfss->namelen. It should
always be set.

>  	if (nfss->acregmin != 3*HZ || showdefaults)
>  		seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
>  	if (nfss->acregmax != 60*HZ || showdefaults)
> @@ -482,6 +490,18 @@ static void nfs_show_mount_options(struc
>  	seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
>  	seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
>  	seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
> +
> +	/*
> +	 * Missing options:
> +	 * port=
> +	 * mountport=
> +	 * mountvers=
> +	 * mountproto=
> +	 * addr=
> +	 * clientaddr=
> +	 * mounthost=
> +	 * mountaddr=
> +	 */

The new text mount interface actually does allow us to store these
values if we really do need to. That should be a separate patch,
however.

Trond
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