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/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright (C) 2001, 2002 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@cambridge.redhat.com>
*
* The original JFFS, from which the design for JFFS2 was derived,
* was designed and implemented by Axis Communications AB.
*
* The contents of this file are subject to the Red Hat eCos Public
* License Version 1.1 (the "Licence"); you may not use this file
* except in compliance with the Licence. You may obtain a copy of
* the Licence at http://www.redhat.com/
*
* Software distributed under the Licence is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
* See the Licence for the specific language governing rights and
* limitations under the Licence.
*
* The Original Code is JFFS2 - Journalling Flash File System, version 2
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License version 2 (the "GPL"), in
* which case the provisions of the GPL are applicable instead of the
* above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use your
* version of this file under the RHEPL, indicate your decision by
* deleting the provisions above and replace them with the notice and
* other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file
* under either the RHEPL or the GPL.
*
* $Id: symlink.c,v 1.5.2.1 2002/01/15 10:39:06 dwmw2 Exp $
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/jffs2.h>
#include "nodelist.h"
int jffs2_readlink(struct dentry *dentry, char *buffer, int buflen);
int jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);
struct inode_operations jffs2_symlink_inode_operations =
{
readlink: jffs2_readlink,
follow_link: jffs2_follow_link,
setattr: jffs2_setattr
};
static char *jffs2_getlink(struct dentry *dentry)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
char *buf;
int ret;
down(&f->sem);
if (!f->metadata) {
up(&f->sem);
printk(KERN_NOTICE "No metadata for symlink inode #%lu\n", dentry->d_inode->i_ino);
return ERR_PTR(-EINVAL);
}
buf = kmalloc(f->metadata->size+1, GFP_USER);
if (!buf) {
up(&f->sem);
return ERR_PTR(-ENOMEM);
}
buf[f->metadata->size]=0;
ret = jffs2_read_dnode(JFFS2_SB_INFO(dentry->d_inode->i_sb), f->metadata, buf, 0, f->metadata->size);
up(&f->sem);
if (ret) {
kfree(buf);
return ERR_PTR(ret);
}
return buf;
}
int jffs2_readlink(struct dentry *dentry, char *buffer, int buflen)
{
unsigned char *kbuf;
int ret;
kbuf = jffs2_getlink(dentry);
if (IS_ERR(kbuf))
return PTR_ERR(kbuf);
ret = vfs_readlink(dentry, buffer, buflen, kbuf);
kfree(kbuf);
return ret;
}
int jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)
{
unsigned char *buf;
int ret;
buf = jffs2_getlink(dentry);
if (IS_ERR(buf))
return PTR_ERR(buf);
ret = vfs_follow_link(nd, buf);
kfree(buf);
return ret;
}
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