Subversion Repositories or1k

/*

 * 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 1.1.1.1 2004-04-15 01:11:04 phoenix 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;

}