/*
* Copyright (c) 2005-2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* lookup.c - vnode lookup function.
*/
#include <sys/vnode.h>
#include <sys/mount.h>
#include <limits.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include "vfs.h"
/*
* Convert a pathname into a pointer to a locked vnode.
* @path: full path name.
* @vpp: vnode to be returned.
*/
int
namei(char *path, vnode_t *vpp)
{
char *p;
char node[PATH_MAX];
char name[PATH_MAX];
mount_t mp;
vnode_t dvp, vp;
int err, i;
DPRINTF(VFSDB_VNODE, ("namei: path=%s\n", path));
/*
* Convert a full path name to its mount point and
* the local node in the file system.
*/
if (vfs_findroot(path, &mp, &p))
return ENOTDIR;
strcpy(node, "/");
strlcat(node, p, PATH_MAX);
vp = vn_lookup(mp, node);
if (vp) {
/* vnode is already active. */
*vpp = vp;
return 0;
}
/*
* Find target vnode, started from root directory.
* This is done to attach the fs specific data to
* the target vnode.
*/
if ((dvp = mp->m_root) == NULL)
sys_panic("VFS: no root");
vref(dvp);
vn_lock(dvp);
node[0] = '\0';
while (*p != '\0') {
/*
* Get lower directory/file name.
*/
while (*p == '/')
p++;
for (i = 0; i < PATH_MAX; i++) {
if (*p == '\0' || *p == '/')
break;
name[i] = *p++;
}
name[i] = '\0';
/*
* Get a vnode for the target.
*/
strlcat(node, "/", PATH_MAX);
strlcat(node, name, PATH_MAX);
vp = vn_lookup(mp, node);
if (vp == NULL) {
vp = vget(mp, node);
if (vp == NULL) {
vput(dvp);
return ENOMEM;
}
/* Find a vnode in this directory. */
err = VOP_LOOKUP(dvp, name, vp);
if (err || (*p == '/' && vp->v_type != VDIR)) {
/* Not found */
vput(vp);
vput(dvp);
return err;
}
}
vput(dvp);
dvp = vp;
while (*p != '\0' && *p != '/')
p++;
}
*vpp = vp;
return 0;
}
/*
* Search a pathname.
* @path: full path.
* @vpp: pointer to locked vnode for directory.
* @name: pointer to file name in path.
*
* This is a very central but not so complicated routine. ;-P
* This routine returns a locked directory vnode and file name.
*/
int
lookup(char *path, vnode_t *vpp, char **name)
{
char buf[PATH_MAX];
char root[] = "/";
char *file, *dir;
vnode_t vp;
int err;
DPRINTF(VFSDB_VNODE, ("lookup: path=%s\n", path));
/*
* Get the path for directory.
*/
strcpy(buf, path);
file = strrchr(buf, '/');
if (!buf[0])
return ENOTDIR;
if (file == buf)
dir = root;
else {
*file = '\0';
dir = buf;
}
/*
* Get the vnode for directory
*/
if ((err = namei(dir, &vp)) != 0)
return err;
if (vp->v_type != VDIR) {
vput(vp);
return ENOTDIR;
}
*vpp = vp;
/*
* Get the file name
*/
*name = strrchr(path, '/') + 1;
return 0;
}