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/*
* linux/fs/affs/symlink.c
*
* 1995 Hans-Joachim Widmaier - Modified for affs.
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* affs symlink handling code
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/affs_fs.h>
#include <linux/amigaffs.h>
#include <asm/uaccess.h>
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
static int affs_readlink(struct dentry *, char *, int);
static struct dentry *affs_follow_link(struct dentry *dentry, struct dentry *base, unsigned int);
struct inode_operations affs_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 */
affs_readlink, /* readlink */
affs_follow_link, /* follow_link */
NULL, /* get_block */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* flushpage */
NULL, /* truncate */
NULL, /* permission */
NULL, /* smap */
NULL /* revalidate */
};
static int
affs_readlink(struct dentry *dentry, char *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
struct slink_front *lf;
int i, j;
char c;
char lc;
char *pf;
pr_debug("AFFS: readlink(ino=%lu,buflen=%d)\n",inode->i_ino,buflen);
bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
if (!bh) {
affs_warning(inode->i_sb,"follow_link","Unable to read i-node block %lu\n",
inode->i_ino);
return -EIO;
}
lf = (struct slink_front *)bh->b_data;
lc = 0;
i = 0;
j = 0;
pf = inode->i_sb->u.affs_sb.s_prefix ? inode->i_sb->u.affs_sb.s_prefix : "/";
if (strchr(lf->symname,':')) { /* Handle assign or volume name */
while (i < buflen && (c = pf[i])) {
put_user(c,buffer++);
i++;
}
while (i < buflen && (c = lf->symname[j]) != ':') {
put_user(c,buffer++);
i++, j++;
}
if (i < buflen) {
put_user('/',buffer++);
i++, j++;
}
lc = '/';
}
while (i < buflen && (c = lf->symname[j])) {
if (c == '/' && lc == '/' && (i + 3 < buflen)) { /* parent dir */
put_user('.',buffer++);
put_user('.',buffer++);
i += 2;
}
put_user(c,buffer++);
lc = c;
i++, j++;
}
affs_brelse(bh);
return i;
}
static struct dentry *
affs_follow_link(struct dentry *dentry, struct dentry *base, unsigned int follow)
{
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
struct slink_front *lf;
char *buffer;
int i, j;
char c;
char lc;
char *pf;
pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
if (!(buffer = kmalloc(1024,GFP_KERNEL))) {
dput(base);
return ERR_PTR(-ENOSPC);
}
bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
if (!bh) {
affs_warning(inode->i_sb,"follow_link","Unable to read i-node block %lu\n",
inode->i_ino);
kfree(buffer);
dput(base);
return ERR_PTR(-EIO);
}
i = 0;
j = 0;
lf = (struct slink_front *)bh->b_data;
lc = 0;
pf = inode->i_sb->u.affs_sb.s_prefix ? inode->i_sb->u.affs_sb.s_prefix : "/";
if (strchr(lf->symname,':')) { /* Handle assign or volume name */
while (i < 1023 && (c = pf[i]))
buffer[i++] = c;
while (i < 1023 && lf->symname[j] != ':')
buffer[i++] = lf->symname[j++];
if (i < 1023)
buffer[i++] = '/';
j++;
lc = '/';
}
while (i < 1023 && (c = lf->symname[j])) {
if (c == '/' && lc == '/' && i < 1020) { /* parent dir */
buffer[i++] = '.';
buffer[i++] = '.';
}
buffer[i++] = c;
lc = c;
j++;
}
buffer[i] = '\0';
affs_brelse(bh);
base = lookup_dentry(buffer,base,follow);
kfree(buffer);
return base;
}
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