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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.
*/
#include <sys/types.h>
#include <sys/syslog.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/cdefs.h>
#include <sys/mount.h>
#include <os/vfs.h>
#include <string.h>
/*
* Represents the root mountlist, every other
* mountpoint is put here.
*/
static struct mountlist root;
/*
* Allocate a new mountpoint
*/
int
mount_alloc(const char *name, struct mount **mp_res)
{
struct mount *mp;
size_t len, slen;
if (mp_res == NULL || name == NULL) {
return -EINVAL;
}
mp = kalloc(sizeof(*mp));
if (mp == NULL) {
printf("mount_alloc: allocation failure\n");
return -ENOMEM;
}
slen = strlen(name);
len = MIN(sizeof(mp->name), slen);
memcpy(mp->name, name, len);
*mp_res = mp;
return 0;
}
/*
* Mount a filesystem
*/
int
mount(struct mount_args *margs, uint32_t flags)
{
const struct vfsops *vfsops;
struct fs_info *fip = NULL;
int error;
if (margs == NULL) {
return -EINVAL;
}
/* XXX: Unused as of now */
(void)margs->source;
(void)margs->target;
(void)margs->data;
/* XXX: Requires fstype for now */
if (margs->fstype == NULL) {
return -ENOENT;
}
/*
* Now we go through each entry of the filesystem
* table and if it matches the filesystem type,
* we're good.
*/
for (uint8_t i = 0;; ++i) {
error = vfs_by_index(i, &fip);
if (error != 0) {
return -ENOENT;
}
if (strcmp(fip->name, margs->fstype) == 0) {
break;
}
}
/* Sanity check */
if (__unlikely(fip == NULL)) {
printf("mount: got NULL filesystem info\n");
return -ENOENT;
}
vfsops = fip->vfsops;
if (__unlikely(vfsops->mount == NULL)) {
printf("mount: fs does not implement mount!\n");
return -EIO;
}
vfsops->mount(fip, margs);
return 0;
}
/*
* Initialize the mountlist
*/
int
mountlist_init(struct mountlist *mlp)
{
if (mlp == NULL) {
mlp = &root;
}
/* Don't initialize twice */
if (mlp->i) {
return -EPERM;
}
TAILQ_INIT(&mlp->list);
mlp->i = 1;
return 0;
}
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