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/*
* linux/fs/efs/symlink.c
*
* Copyright (C) 1998 Mike Shaver
*
* Portions derived from work (C) 1995,1996 Christian Vogelgsang.
* ``Inspired by'' fs/ext2/symlink.c.
*/
#include <linux/efs_fs.h>
#include <asm/uaccess.h>
static struct dentry *
efs_follow_link(struct dentry *dentry, struct dentry *base)
{
struct inode *in = dentry->d_inode;
struct buffer_head *bh;
bh = bread(in->i_dev, efs_bmap(in, 0), EFS_BLOCK_SIZE);
if (!bh) {
dput(base);
return ERR_PTR(-EIO);
}
UPDATE_ATIME(in);
base = lookup_dentry(bh->b_data, base, 1);
brelse(bh);
return base;
}
static int
efs_readlink(struct dentry *dentry, char * buffer, int buflen)
{
int i;
struct buffer_head *bh;
struct inode *in = dentry->d_inode;
if (buflen > 1023)
buflen = 1023;
if (in->i_size < buflen)
buflen = in->i_size;
bh = bread(in->i_dev, efs_bmap(in, 0), EFS_BLOCK_SIZE);
if (!bh)
return 0;
i = 0;
/* XXX need strncpy_to_user */
while (i < buflen && bh->b_data[i])
i++;
if (copy_to_user(buffer, bh->b_data, i))
i = -EFAULT;
UPDATE_ATIME(in);
brelse(bh);
return i;
}
struct inode_operations efs_symlink_inode_operations = {
NULL, /* no file-operations */
NULL, /* create */
NULL, /* lookup */
NULL, /* link */
NULL, /* unlink */
NULL, /* symlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* mknod */
NULL, /* rename */
efs_readlink,
efs_follow_link,
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
NULL, /* permission */
NULL /* smap */
};
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