/*
 *  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.
 *
 *  When using the NFS namespace, we set the mode to indicate a symlink and
 *  don't bother with the magic numbers.
 *
 *  from linux/fs/ext2/symlink.c
 *
 *  Copyright (C) 1998-99, Frank A. Vorstenbosch
 *
 *  ncpfs symlink handling code
 *  NLS support (c) 1999 Petr Vandrovec
 *  Modified 2000 Ben Harris, University of Cambridge for NFS NS meta-info
 *
 */


#include <linux/uaccess.h>

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/stat.h>
#include "ncp_fs.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	cpu_to_le32(0x6c6d7973)     /* "symlnk->" */
#define NCP_SYMLINK_MAGIC1	cpu_to_le32(0x3e2d6b6e)

/* ----- read a symbolic link ------------------------------------------ */

static int ncp_symlink_readpage(struct file *file, struct page *page)
{
	struct inode *inode = page->mapping->host;
	int error, length, len;
	char *link, *rawlink;
	char *buf = kmap(page);

	error = -ENOMEM;
	rawlink = kmalloc(NCP_MAX_SYMLINK_SIZE, GFP_KERNEL);
	if (!rawlink)
		goto fail;

	if (ncp_make_open(inode,O_RDONLY))
		goto failEIO;

	error=ncp_read_kernel(NCP_SERVER(inode),NCP_FINFO(inode)->file_handle,
                         0,NCP_MAX_SYMLINK_SIZE,rawlink,&length);

	ncp_inode_close(inode);
	/* Close file handle if no other users... */
	ncp_make_closed(inode);
	if (error)
		goto failEIO;

	if (NCP_FINFO(inode)->flags & NCPI_KLUDGE_SYMLINK) {
		if (length<NCP_MIN_SYMLINK_SIZE || 
		    ((__le32 *)rawlink)[0]!=NCP_SYMLINK_MAGIC0 ||
		    ((__le32 *)rawlink)[1]!=NCP_SYMLINK_MAGIC1)
		    	goto failEIO;
		link = rawlink + 8;
		length -= 8;
	} else {
		link = rawlink;
	}

	len = NCP_MAX_SYMLINK_SIZE;
	error = ncp_vol2io(NCP_SERVER(inode), buf, &len, link, length, 0);
	kfree(rawlink);
	if (error)
		goto fail;
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
	return 0;

failEIO:
	error = -EIO;
	kfree(rawlink);
fail:
	SetPageError(page);
	kunmap(page);
	unlock_page(page);
	return error;
}

/*
 * symlinks can't do much...
 */
const struct address_space_operations ncp_symlink_aops = {
	.readpage	= ncp_symlink_readpage,
};
	
/* ----- create a new symbolic link -------------------------------------- */
 
int ncp_symlink(struct inode *dir, struct dentry *dentry, const char *symname) {
	struct inode *inode;
	char *rawlink;
	int length, err, i, outlen;
	int kludge;
	umode_t mode;
	__le32 attr;
	unsigned int hdr;

	ncp_dbg(1, "dir=%p, dentry=%p, symname=%s\n", dir, dentry, symname);

	if (ncp_is_nfs_extras(NCP_SERVER(dir), NCP_FINFO(dir)->volNumber))
		kludge = 0;
	else
#ifdef CONFIG_NCPFS_EXTRAS
	if (NCP_SERVER(dir)->m.flags & NCP_MOUNT_SYMLINKS)
		kludge = 1;
	else
#endif
	/* EPERM is returned by VFS if symlink procedure does not exist */
		return -EPERM;
  
	rawlink = kmalloc(NCP_MAX_SYMLINK_SIZE, GFP_KERNEL);
	if (!rawlink)
		return -ENOMEM;

	if (kludge) {
		mode = 0;
		attr = aSHARED | aHIDDEN;
		((__le32 *)rawlink)[0]=NCP_SYMLINK_MAGIC0;
		((__le32 *)rawlink)[1]=NCP_SYMLINK_MAGIC1;
		hdr = 8;
	} else {
		mode = S_IFLNK | S_IRWXUGO;
		attr = 0;
		hdr = 0;
	}			

	length = strlen(symname);
	/* map to/from server charset, do not touch upper/lower case as
	   symlink can point out of ncp filesystem */
	outlen = NCP_MAX_SYMLINK_SIZE - hdr;
	err = ncp_io2vol(NCP_SERVER(dir), rawlink + hdr, &outlen, symname, length, 0);
	if (err)
		goto failfree;

	outlen += hdr;

	err = -EIO;
	if (ncp_create_new(dir,dentry,mode,0,attr)) {
		goto failfree;
	}

	inode=d_inode(dentry);

	if (ncp_make_open(inode, O_WRONLY))
		goto failfree;

	if (ncp_write_kernel(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle, 
			     0, outlen, rawlink, &i) || i!=outlen) {
		goto fail;
	}

	ncp_inode_close(inode);
	ncp_make_closed(inode);
	kfree(rawlink);
	return 0;
fail:;
	ncp_inode_close(inode);
	ncp_make_closed(inode);
failfree:;
	kfree(rawlink);
	return err;
}

/* ----- EOF ----- */
td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Sean Nyekjaer &lt;sean.nyekjaer@prevas.dk&gt;</td><td class='right'>2017-01-27 08:46:23 +0100</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-27 11:10:50 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/mxuport.c?id=9d162ed69f51cbd9ee5a0c7e82aba7acc96362ff'>9d162ed69f51cbd9ee5a0c7e82aba7acc96362ff</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/serial/mxuport.c?id=9d162ed69f51cbd9ee5a0c7e82aba7acc96362ff'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=9d162ed69f51cbd9ee5a0c7e82aba7acc96362ff'>74742b23fbdd09ac31679dffc82290a5293b226f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/serial/mxuport.c?id=9d162ed69f51cbd9ee5a0c7e82aba7acc96362ff'>drivers/usb/serial/mxuport.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/mxuport.c?id=95120ebf647180fbcfba3172677f18116f9231d5'>95120ebf647180fbcfba3172677f18116f9231d5</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/serial/mxuport.c?id=9d162ed69f51cbd9ee5a0c7e82aba7acc96362ff&amp;id2=95120ebf647180fbcfba3172677f18116f9231d5'>diff</a>)</td></tr></table>
<div class='commit-subject'>net: phy: micrel: add support for KSZ8795</div><div class='commit-msg'>This is adds support for the PHYs in the KSZ8795 5port managed switch.

It will allow to detect the link between the switch and the soc
and uses the same read_status functions as the KSZ8873MLL switch.

Signed-off-by: Sean Nyekjaer &lt;sean.nyekjaer@prevas.dk&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=9d162ed69f51cbd9ee5a0c7e82aba7acc96362ff'>Diffstat</a> (limited to 'drivers/usb/serial/mxuport.c')</div><table summary='diffstat' class='diffstat'>