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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* 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 project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
/*
* Description: File lookup algorithm
* Author: Ian Marco Moffett
*/
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/limits.h>
#include <sys/namei.h>
#include <string.h>
int
namei(struct nameidata *ndp)
{
struct mount *mp = NULL;
struct vnode *vp;
struct vop *vops;
struct vop_lookup_args lookup;
struct fs_info *fip;
char namebuf[NAME_MAX];
const char *p, *pcur;
size_t len, i = 0;
int error;
if (ndp == NULL) {
return -EINVAL;
}
if ((p = ndp->path) == NULL) {
printf("namei: path is NULL\n");
return -EINVAL;
}
error = mount_lookup("/", &mp);
if (error < 0) {
printf("namei: failed to get rootfs\n");
return error;
}
vp = mp->vp;
fip = mp->fs;
if ((vops = vp->vops) == NULL) {
printf("namei: failed to get vops\n");
return -EIO;
}
/* We need vops->lookup() */
if (vops->lookup == NULL) {
printf("namei: vops does not have lookup op\n");
return -EIO;
}
/*
* If this is an image we are looking up, then throw
* a path right at it.
*/
if (ISSET(fip->attr, FS_ATTR_IMAGE)) {
lookup.name = ndp->path;
lookup.dirvp = mp->vp;
lookup.vpp = &vp;
/* If it was found, return */
error = vops->lookup(&lookup);
if (error == 0)
return 0;
/* Return the result */
if (ndp->vp_res != NULL)
*ndp->vp_res = vp;
}
printf("namei: f: %s\n", ndp->path);
printf("namei: d: /\n", ndp->path);
pcur = p;
while (*pcur != '\0') {
/* Get out of the slashes */
while (*pcur == '/')
++pcur;
p = pcur;
/* Go back to the start */
memset(namebuf, 0, sizeof(namebuf));
while (*pcur != '/' && *pcur != '\0') {
namebuf[i++] = *pcur++;
if (i > sizeof(namebuf) - 1) {
return -ENAMETOOLONG;
}
}
i = 0;
printf("namei: n %s\n", namebuf);
}
return 0;
}
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