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/*
* Symlink inode operations for Coda filesystem
* Original version: (C) 1996 P. Braam and M. Callahan
* Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
*
* Carnegie Mellon encourages users to contribute improvements to
* the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <asm/segment.h>
#include <asm/uaccess.h>
#include <linux/string.h>
#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_psdev.h>
#include <linux/coda_cnode.h>
#include <linux/coda_namecache.h>
static int coda_readlink(struct inode *inode, char *buffer, int length);
struct inode_operations coda_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 */
coda_readlink, /* readlink */
NULL, /* follow_link */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
NULL, /* permission */
NULL, /* smap */
NULL, /* update page */
NULL /* revalidate */
};
static int coda_readlink(struct inode *inode, char *buffer, int length)
{
int len;
int error;
char *buf;
struct cnode *cp;
ENTRY;
cp = ITOC(inode);
CHECK_CNODE(cp);
/* the maximum length we receive is len */
if ( length > CFS_MAXPATHLEN )
len = CFS_MAXPATHLEN;
else
len = length;
CODA_ALLOC(buf, char *, len);
if ( !buf )
return -ENOMEM;
error = venus_readlink(inode->i_sb, &(cp->c_fid), buf, &len);
CDEBUG(D_INODE, "result %s\n", buf);
if (! error) {
copy_to_user(buffer, buf, len);
put_user('\0', buffer + len);
error = len;
CODA_FREE(buf, len);
}
return error;
}
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