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/*
* QNX4 file system, Linux implementation.
*
* Version : 0.1
*
* Using parts of the xiafs filesystem.
*
* History :
*
* 28-05-1998 by Richard Frowijn : first release.
* 21-06-1998 by Frank Denis : ugly changes to make it compile on Linux 2.1.99+
*/
/* THIS FILE HAS TO BE REWRITTEN */
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/qnx4_fs.h>
#include <linux/stat.h>
#include <asm/segment.h>
#include <asm/uaccess.h>
static int qnx4_readlink(struct dentry *, char *, int);
static struct dentry *qnx4_follow_link(struct dentry *, struct dentry *, unsigned int follow);
/*
* symlinks can't do much...
*/
struct inode_operations qnx4_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 */
qnx4_readlink, /* readlink */
qnx4_follow_link, /* follow_link */
NULL, /* get_block */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* flushpage */
NULL, /* truncate */
NULL, /* permission */
NULL, /* smap */
NULL /* revalidate */
};
static struct dentry *qnx4_follow_link(struct dentry *dentry,
struct dentry *base, unsigned int follow)
{
#if 0
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
if (!inode) {
return ERR_PTR(-ENOENT);
}
if (current->link_count > 5) {
return ERR_PTR(-ELOOP);
}
if (!(bh = qnx4_bread(inode, 0, 0))) {
return ERR_PTR(-EIO);
}
current->link_count++;
current->link_count--;
brelse(bh);
return 0;
#else
printk("qnx4: qnx4_follow_link needs to be fixed.\n");
return ERR_PTR(-EIO);
#endif
}
static int qnx4_readlink(struct dentry *dentry, char *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
int i;
char c;
struct qnx4_inode_info *qnx4_ino;
QNX4DEBUG(("qnx4: qnx4_readlink() called\n"));
if (buffer == NULL || inode == NULL || !S_ISLNK(inode->i_mode)) {
return -EINVAL;
}
qnx4_ino = &inode->u.qnx4_i;
if (buflen > 1023) {
buflen = 1023;
}
bh = bread(inode->i_dev, qnx4_ino->i_first_xtnt.xtnt_blk,
QNX4_BLOCK_SIZE);
if (bh == NULL) {
QNX4DEBUG(("qnx4: NULL symlink bh\n"));
return 0;
}
QNX4DEBUG(("qnx4: qnx4_bread sym called -> [%s]\n",
bh->b_data));
if (bh->b_data[0] != 0) {
i = 0;
while (i < buflen && (c = bh->b_data[i])) {
i++;
put_user(c, buffer++);
}
brelse(bh);
return i;
} else {
brelse(bh);
memcpy(buffer, "fixme", 5);
return 5;
}
}
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