static int nfs_follow_link(struct inode *dir, struct inode *inode,
int flag, int mode, struct inode **res_inode)
{
int error, *mem;
unsigned int len;
char *res, *res2;
*res_inode = NULL;
if (!dir) {
dir = current->fs->root;
dir->i_count++;
}
if (!inode) {
iput(dir);
return -ENOENT;
}
if (!S_ISLNK(inode->i_mode)) {
iput(dir);
*res_inode = inode;
return 0;
}
if (current->link_count > 5) {
iput(inode);
iput(dir);
return -ELOOP;
}
error = nfs_proc_readlink(NFS_SERVER(inode), NFS_FH(inode), &mem,
&res, &len, NFS_MAXPATHLEN);
if (error) {
iput(inode);
iput(dir);
kfree(mem);
return error;
}
while ((res2 = (char *) kmalloc(NFS_MAXPATHLEN + 1, GFP_NFS)) == NULL) {
schedule();
}
memcpy(res2, res, len);
res2[len] = '\0';
kfree(mem);
iput(inode);
current->link_count++;
error = open_namei(res2, flag, mode, res_inode, dir);
current->link_count--;
kfree_s(res2, NFS_MAXPATHLEN + 1);
return error;
}
int
nfs_readlink(struct file *filp, char *buf, int bufsize) {
struct nfs_fh *fhandle;
int status;
DPRINTF(CLU_LEVEL,("nfs_readlink:\n"));
demand(filp, bogus filp);
if (buf == (char *) 0) {errno = EFAULT; return -1;}
fhandle = GETFHANDLE(filp);
status = nfs_proc_readlink(fhandle,buf);
if (status != 0) {
errno = status;
return -1;
} else {
return strlen(buf);
}
}
static int nfs_readlink(struct inode *inode, char *buffer, int buflen)
{
int error, *mem;
unsigned int len;
char *res;
if (!S_ISLNK(inode->i_mode)) {
iput(inode);
return -EINVAL;
}
if (buflen > NFS_MAXPATHLEN)
buflen = NFS_MAXPATHLEN;
error = nfs_proc_readlink(NFS_SERVER(inode), NFS_FH(inode), &mem,
&res, &len, buflen);
iput(inode);
if (! error) {
memcpy_tofs(buffer, res, len);
put_fs_byte('\0', buffer + len);
error = len;
}
kfree(mem);
return error;
}