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/*
* linux/fs/ncpfs/symlink.c
*
* Code for allowing symbolic links on NCPFS (i.e. NetWare)
* Symbolic links are not supported on native NetWare, so we use an
* infrequently-used flag (Sh) and store a two-word magic header in
* the file to make sure we don't accidentally use a non-link file
* as a link.
*
* from linux/fs/ext2/symlink.c
*
* Copyright (C) 1998-99, Frank A. Vorstenbosch
*
* ncpfs symlink handling code
* NLS support (c) 1999 Petr Vandrovec
*
*/
#include <linux/config.h>
#ifdef CONFIG_NCPFS_EXTRAS
#include <asm/uaccess.h>
#include <asm/segment.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ncp_fs.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/stat.h>
#include "ncplib_kernel.h"
/* these magic numbers must appear in the symlink file -- this makes it a bit
more resilient against the magic attributes being set on random files. */
#define NCP_SYMLINK_MAGIC0 le32_to_cpu(0x6c6d7973) /* "symlnk->" */
#define NCP_SYMLINK_MAGIC1 le32_to_cpu(0x3e2d6b6e)
static int ncp_readlink(struct dentry *, char *, int);
static struct dentry *ncp_follow_link(struct dentry *, struct dentry *, unsigned int);
int ncp_create_new(struct inode *dir, struct dentry *dentry,
int mode,int attributes);
/*
* symlinks can't do much...
*/
struct inode_operations ncp_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 */
ncp_readlink, /* readlink */
ncp_follow_link, /* follow_link */
NULL, /* get_block */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* flushpage */
NULL, /* truncate */
NULL, /* permission */
NULL, /* smap */
NULL /* revalidate */
};
/* ----- follow a symbolic link ------------------------------------------ */
static struct dentry *ncp_follow_link(struct dentry *dentry,
struct dentry *base,
unsigned int follow)
{
struct inode *inode=dentry->d_inode;
int error, length, cnt;
char *link;
#ifdef DEBUG
PRINTK("ncp_follow_link(dentry=%p,base=%p,follow=%u)\n",dentry,base,follow);
#endif
if(!S_ISLNK(inode->i_mode)) {
dput(base);
return ERR_PTR(-EINVAL);
}
if(ncp_make_open(inode,O_RDONLY)) {
dput(base);
return ERR_PTR(-EIO);
}
for (cnt = 0; (link=(char *)kmalloc(NCP_MAX_SYMLINK_SIZE+1, GFP_NFS))==NULL; cnt++) {
if (cnt > 10) {
dput(base);
return ERR_PTR(-EAGAIN); /* -ENOMEM? */
}
schedule();
}
error=ncp_read_kernel(NCP_SERVER(inode),NCP_FINFO(inode)->file_handle,
0,NCP_MAX_SYMLINK_SIZE,link,&length);
if (error!=0 || length<NCP_MIN_SYMLINK_SIZE ||
((__u32 *)link)[0]!=NCP_SYMLINK_MAGIC0 || ((__u32 *)link)[1]!=NCP_SYMLINK_MAGIC1) {
dput(base);
kfree(link);
return ERR_PTR(-EIO);
}
link[length]=0;
vol2io(NCP_SERVER(inode), link+8, 0);
/* UPDATE_ATIME(inode); */
base=lookup_dentry(link+8, base, follow);
kfree(link);
return base;
}
/* ----- read symbolic link ---------------------------------------------- */
static int ncp_readlink(struct dentry * dentry, char * buffer, int buflen)
{
struct inode *inode=dentry->d_inode;
char *link;
int length,error;
#ifdef DEBUG
PRINTK("ncp_readlink(dentry=%p,buffer=%p,buflen=%d)\n",dentry,buffer,buflen);
#endif
if(!S_ISLNK(inode->i_mode))
return -EINVAL;
if(ncp_make_open(inode,O_RDONLY))
return -EIO;
if((link=(char *)kmalloc(NCP_MAX_SYMLINK_SIZE+1,GFP_NFS))==NULL)
return -ENOMEM;
error = ncp_read_kernel(NCP_SERVER(inode),NCP_FINFO(inode)->file_handle,
0,NCP_MAX_SYMLINK_SIZE,link,&length);
if (error!=0 || length < NCP_MIN_SYMLINK_SIZE || buflen < (length-8) ||
((__u32 *)link)[0]!=NCP_SYMLINK_MAGIC0 ||((__u32 *)link)[1]!=NCP_SYMLINK_MAGIC1) {
error = -EIO;
goto out;
}
link[length] = 0;
vol2io(NCP_SERVER(inode), link+8, 0);
error = length - 8;
if(copy_to_user(buffer, link+8, error))
error = -EFAULT;
out:;
kfree(link);
return error;
}
/* ----- create a new symbolic link -------------------------------------- */
int ncp_symlink(struct inode *dir, struct dentry *dentry, const char *symname) {
int i,length;
struct inode *inode;
char *link;
#ifdef DEBUG
PRINTK("ncp_symlink(dir=%p,dentry=%p,symname=%s)\n",dir,dentry,symname);
#endif
if (!(NCP_SERVER(dir)->m.flags & NCP_MOUNT_SYMLINKS))
return -EPERM; /* EPERM is returned by VFS if symlink procedure does not exist */
if ((length=strlen(symname))>NCP_MAX_SYMLINK_SIZE)
return -EINVAL;
if ((link=(char *)kmalloc(length+9,GFP_NFS))==NULL)
return -ENOMEM;
if (ncp_create_new(dir,dentry,0,aSHARED|aHIDDEN)) {
kfree(link);
return -EIO;
}
inode=dentry->d_inode;
((__u32 *)link)[0]=NCP_SYMLINK_MAGIC0;
((__u32 *)link)[1]=NCP_SYMLINK_MAGIC1;
memcpy(link+8, symname, length+1); /* including last zero for io2vol */
/* map to/from server charset, do not touch upper/lower case as
symlink can point out of ncp filesystem */
io2vol(NCP_SERVER(inode), link+8, 0);
if(ncp_write_kernel(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle,
0, length+8, link, &i) || i!=length+8) {
kfree(link);
return -EIO;
}
kfree(link);
return 0;
}
#endif
/* ----- EOF ----- */
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