linux-kernel - Re: [patch 6/7] fs, exportfs: Add exportfs_encode_inode

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Date:	Wed, 14 Nov 2012 12:37:58 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>,
	aneesh.kumar@...ux.vnet.ibm.com, oleg@...hat.com,
	rientjes@...gle.com, tvrtko.ursulin@...lan.co.uk,
	Andrey Vagin <avagin@...nvz.org>
Subject: Re: [patch 6/7] fs, exportfs: Add exportfs_encode_inode_fh helper

On Wed, Nov 14, 2012 at 07:19:43PM +0400, Cyrill Gorcunov wrote:
> We will need this helper in the next patch to
> provide a file handle for inotify marks in
> /proc/pid/fdinfo output.
> 
> The patch is rather providing the way to use inodes
> directly when dentry is not available (like in case
> of inotify system).

Looks OK to me.--b.

> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> CC: Pavel Emelyanov <xemul@...allels.com>
> CC: Oleg Nesterov <oleg@...hat.com>
> CC: Andrey Vagin <avagin@...nvz.org>
> CC: Al Viro <viro@...IV.linux.org.uk>
> CC: Alexey Dobriyan <adobriyan@...il.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: James Bottomley <jbottomley@...allels.com>
> CC: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> CC: Alexey Dobriyan <adobriyan@...il.com>
> CC: Matthew Helsley <matt.helsley@...il.com>
> CC: "J. Bruce Fields" <bfields@...ldses.org>
> CC: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> CC: Tvrtko Ursulin <tvrtko.ursulin@...lan.co.uk>
> ---
>  fs/exportfs/expfs.c      |   19 ++++++++++++++-----
>  include/linux/exportfs.h |    2 ++
>  2 files changed, 16 insertions(+), 5 deletions(-)
> Index: linux-2.6.git/fs/exportfs/expfs.c
> ===================================================================
> --- linux-2.6.git.orig/fs/exportfs/expfs.c
> +++ linux-2.6.git/fs/exportfs/expfs.c
> @@ -341,10 +341,21 @@ static int export_encode_fh(struct inode
>  	return type;
>  }
>  
> +int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
> +			     int *max_len, struct inode *parent)
> +{
> +	const struct export_operations *nop = inode->i_sb->s_export_op;
> +
> +	if (nop && nop->encode_fh)
> +		return nop->encode_fh(inode, fid->raw, max_len, parent);
> +
> +	return export_encode_fh(inode, fid, max_len, parent);
> +}
> +EXPORT_SYMBOL_GPL(exportfs_encode_inode_fh);
> +
>  int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, int *max_len,
>  		int connectable)
>  {
> -	const struct export_operations *nop = dentry->d_sb->s_export_op;
>  	int error;
>  	struct dentry *p = NULL;
>  	struct inode *inode = dentry->d_inode, *parent = NULL;
> @@ -357,10 +368,8 @@ int exportfs_encode_fh(struct dentry *de
>  		 */
>  		parent = p->d_inode;
>  	}
> -	if (nop && nop->encode_fh)
> -		error = nop->encode_fh(inode, fid->raw, max_len, parent);
> -	else
> -		error = export_encode_fh(inode, fid, max_len, parent);
> +
> +	error = exportfs_encode_inode_fh(inode, fid, max_len, parent);
>  	dput(p);
>  
>  	return error;
> Index: linux-2.6.git/include/linux/exportfs.h
> ===================================================================
> --- linux-2.6.git.orig/include/linux/exportfs.h
> +++ linux-2.6.git/include/linux/exportfs.h
> @@ -177,6 +177,8 @@ struct export_operations {
>  	int (*commit_metadata)(struct inode *inode);
>  };
>  
> +extern int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
> +				    int *max_len, struct inode *parent);
>  extern int exportfs_encode_fh(struct dentry *dentry, struct fid *fid,
>  	int *max_len, int connectable);
>  extern struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
> 
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