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@xxxxxxxxxx>
> CC: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> CC: Oleg Nesterov <oleg@xxxxxxxxxx>
> CC: Andrey Vagin <avagin@xxxxxxxxxx>
> CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> CC: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: James Bottomley <jbottomley@xxxxxxxxxxxxx>
> CC: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> CC: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> CC: Matthew Helsley <matt.helsley@xxxxxxxxx>
> CC: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
> CC: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> CC: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxx>
> ---
> 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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