/* -*- linux-c -*- --------------------------------------------------------- *
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/* -*- linux-c -*- --------------------------------------------------------- *
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*
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*
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* linux/fs/autofs/symlink.c
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* linux/fs/autofs/symlink.c
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*
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*
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* Copyright 1997 Transmeta Corporation -- All Rights Reserved
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* Copyright 1997 Transmeta Corporation -- All Rights Reserved
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*
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*
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* This file is part of the Linux kernel and is made available under
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* This file is part of the Linux kernel and is made available under
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* the terms of the GNU General Public License, version 2, or at your
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* the terms of the GNU General Public License, version 2, or at your
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* option, any later version, incorporated herein by reference.
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* option, any later version, incorporated herein by reference.
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*
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*
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* ------------------------------------------------------------------------- */
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* ------------------------------------------------------------------------- */
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include "autofs_i.h"
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#include "autofs_i.h"
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static int autofs_follow_link(struct inode *dir, struct inode *inode,
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static int autofs_follow_link(struct inode *dir, struct inode *inode,
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int flag, int mode, struct inode **res_inode)
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int flag, int mode, struct inode **res_inode)
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{
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{
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int error;
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int error;
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char *link;
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char *link;
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*res_inode = NULL;
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*res_inode = NULL;
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if (!dir) {
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if (!dir) {
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dir = current->fs->root;
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dir = current->fs->root;
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dir->i_count++;
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dir->i_count++;
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}
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}
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if (!inode) {
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if (!inode) {
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iput(dir);
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iput(dir);
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return -ENOENT;
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return -ENOENT;
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}
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}
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if (!S_ISLNK(inode->i_mode)) {
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if (!S_ISLNK(inode->i_mode)) {
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iput(dir);
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iput(dir);
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*res_inode = inode;
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*res_inode = inode;
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return 0;
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return 0;
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}
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}
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if (current->link_count > 5) {
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if (current->link_count > 5) {
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iput(dir);
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iput(dir);
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iput(inode);
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iput(inode);
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return -ELOOP;
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return -ELOOP;
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}
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}
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link = ((struct autofs_symlink *)inode->u.generic_ip)->data;
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link = ((struct autofs_symlink *)inode->u.generic_ip)->data;
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current->link_count++;
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current->link_count++;
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error = open_namei(link,flag,mode,res_inode,dir);
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error = open_namei(link,flag,mode,res_inode,dir);
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current->link_count--;
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current->link_count--;
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iput(inode);
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iput(inode);
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return error;
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return error;
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}
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}
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static int autofs_readlink(struct inode *inode, char *buffer, int buflen)
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static int autofs_readlink(struct inode *inode, char *buffer, int buflen)
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{
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{
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struct autofs_symlink *sl;
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struct autofs_symlink *sl;
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int len;
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int len;
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if (!S_ISLNK(inode->i_mode)) {
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if (!S_ISLNK(inode->i_mode)) {
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iput(inode);
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iput(inode);
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return -EINVAL;
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return -EINVAL;
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}
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}
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sl = (struct autofs_symlink *)inode->u.generic_ip;
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sl = (struct autofs_symlink *)inode->u.generic_ip;
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len = sl->len;
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len = sl->len;
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if (len > buflen) len = buflen;
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if (len > buflen) len = buflen;
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copy_to_user(buffer,sl->data,len);
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copy_to_user(buffer,sl->data,len);
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iput(inode);
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iput(inode);
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return len;
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return len;
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}
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}
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struct inode_operations autofs_symlink_inode_operations = {
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struct inode_operations autofs_symlink_inode_operations = {
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NULL, /* file operations */
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NULL, /* file operations */
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NULL, /* create */
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NULL, /* create */
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NULL, /* lookup */
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NULL, /* lookup */
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NULL, /* link */
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NULL, /* link */
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NULL, /* unlink */
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NULL, /* unlink */
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NULL, /* symlink */
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NULL, /* symlink */
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NULL, /* mkdir */
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NULL, /* mkdir */
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NULL, /* rmdir */
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NULL, /* rmdir */
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NULL, /* mknod */
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NULL, /* mknod */
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NULL, /* rename */
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NULL, /* rename */
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autofs_readlink, /* readlink */
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autofs_readlink, /* readlink */
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autofs_follow_link, /* follow_link */
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autofs_follow_link, /* follow_link */
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NULL, /* readpage */
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NULL, /* readpage */
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NULL, /* writepage */
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NULL, /* writepage */
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NULL, /* bmap */
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NULL, /* bmap */
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NULL, /* truncate */
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NULL, /* truncate */
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NULL /* permission */
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NULL /* permission */
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};
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};
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