symlink.c

linux 内核源代码

/*
 *  symlink.c
 *
 *  Copyright (C) 2002 by John Newbigin
 *
 *  Please add a note about your changes to smbfs in the ChangeLog file.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/net.h>
#include <linux/namei.h>

#include <asm/uaccess.h>
#include <asm/system.h>

#include <linux/smbno.h>
#include <linux/smb_fs.h>

#include "smb_debug.h"
#include "proto.h"

int smb_symlink(struct inode *inode, struct dentry *dentry, const char *oldname)
{
	DEBUG1("create symlink %s -> %s/%s\n", oldname, DENTRY_PATH(dentry));

	return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
}

static void *smb_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	char *link = __getname();
	DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));

	if (!link) {
		link = ERR_PTR(-ENOMEM);
	} else {
		int len = smb_proc_read_link(server_from_dentry(dentry),
						dentry, link, PATH_MAX - 1);
		if (len < 0) {
			__putname(link);
			link = ERR_PTR(len);
		} else {
			link[len] = 0;
		}
	}
	nd_set_link(nd, link);
	return NULL;
}

static void smb_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
		__putname(s);
}

const struct inode_operations smb_link_inode_operations =
{
	.readlink	= generic_readlink,
	.follow_link	= smb_follow_link,
	.put_link	= smb_put_link,
};