linux/fs/isofs/export.c

// SPDX-License-Identifier: GPL-2.0
/*
 * fs/isofs/export.c
 *
 *  (C) 2004  Paul Serice - The new inode scheme requires switching
 *                          from iget() to iget5_locked() which means
 *                          the NFS export operations have to be hand
 *                          coded because the default routines rely on
 *                          iget().
 *
 * The following files are helpful:
 *
 *     Documentation/filesystems/nfs/exporting.rst
 *     fs/exportfs/expfs.c.
 */

#include "isofs.h"

static struct dentry *
isofs_export_iget(struct super_block *sb,
		  unsigned long block,
		  unsigned long offset,
		  __u32 generation)
{ … }

/* This function is surprisingly simple.  The trick is understanding
 * that "child" is always a directory. So, to find its parent, you
 * simply need to find its ".." entry, normalize its block and offset,
 * and return the underlying inode.  See the comments for
 * isofs_normalize_block_and_offset(). */
static struct dentry *isofs_export_get_parent(struct dentry *child)
{ … }

static int
isofs_export_encode_fh(struct inode *inode,
		       __u32 *fh32,
		       int *max_len,
		       struct inode *parent)
{ … }

struct isofs_fid { … };

static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
	struct fid *fid, int fh_len, int fh_type)
{ … }

static struct dentry *isofs_fh_to_parent(struct super_block *sb,
		struct fid *fid, int fh_len, int fh_type)
{ … }

const struct export_operations isofs_export_ops = …;