Add support for NFS exporting

exfat_super.c

@@ -2163,6 +2163,45 @@ const struct super_operations exfat_sops = {
 	.show_options  = exfat_show_options,
 };
+/*======================================================================*/
+/*  Export Operations                                                   */
+/*======================================================================*/
+
+static struct inode *exfat_nfs_get_inode(struct super_block *sb,
+				       u64 ino, u32 generation)
+{
+	struct inode *inode = NULL;
+	if (ino < EXFAT_ROOT_INO)
+		return inode;
+	inode = ilookup(sb, ino);
+
+	if (inode && generation && (inode->i_generation != generation)) {
+		iput(inode);
+		inode = NULL;
+	}
+
+	return inode;
+}
+
+static struct dentry *exfat_fh_to_dentry(struct super_block *sb, struct fid *fid,
+				int fh_len, int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+				    exfat_nfs_get_inode);
+}
+
+static struct dentry *exfat_fh_to_parent(struct super_block *sb, struct fid *fid,
+				int fh_len, int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+				    exfat_nfs_get_inode);
+}
+
+const struct export_operations exfat_export_ops = {
+	.fh_to_dentry   = exfat_fh_to_dentry,
+	.fh_to_parent   = exfat_fh_to_parent,
+};
+
 /*======================================================================*/
 /*  Super Block Read Operations                                         */
 /*======================================================================*/
@@ -2416,6 +2455,7 @@ static int exfat_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_flags |= MS_NODIRATIME;
 	sb->s_magic = EXFAT_SUPER_MAGIC;
 	sb->s_op = &exfat_sops;
+	sb->s_export_op = &exfat_export_ops;
 	error = parse_options(data, silent, &debug, &sbi->options);
 	if (error)