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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* 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 Hyra 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/vnode.h>
#include <sys/errno.h>
#include <sys/mount.h>
#include <sys/syslog.h>
#include <vm/dynalloc.h>
#include <string.h>
mountlist_t g_mountlist;
int
vfs_alloc_vnode(struct vnode **res, int type)
{
struct vnode *vp = vfs_recycle_vnode();
/*
* If there are no vnodes to be recycled, attempt
* to allocate a new one.
*/
if (vp == NULL)
vp = dynalloc(sizeof(struct vnode));
if (vp == NULL)
return -ENOMEM;
memset(vp, 0, sizeof(*vp));
vp->type = type;
vp->refcount = 1;
*res = vp;
return 0;
}
/*
* Allocate a mount structure.
*
* @vp: Vnode this mount structure covers.
* @fip: File system information.
*/
struct mount *
vfs_alloc_mount(struct vnode *vp, struct fs_info *fip)
{
struct mount *mp;
mp = dynalloc(sizeof(*mp));
if (mp == NULL)
return NULL;
memset(mp, 0, sizeof(*mp));
mp->vp = vp;
mp->mnt_ops = fip->vfsops;
return mp;
}
/*
* Assign a name to a mountpoint.
*
* @mp: Mountpoint to name.
* @name: Name to give.
*/
int
vfs_name_mount(struct mount *mp, const char *name)
{
size_t name_len = strlen(name);
if (name_len > NAME_MAX)
return -ENAMETOOLONG;
mp->name = dynalloc(sizeof(char) * name_len + 1);
if (mp->name == NULL)
return -ENOMEM;
memcpy(mp->name, name, name_len);
mp->name[name_len] = '\0';
return 0;
}
/*
* Release the resources associated with a vnode and
* mark the vnode to *possibly* be deallocated unless
* recycled.
*/
int
vfs_release_vnode(struct vnode *vp)
{
const struct vops *vops = vp->vops;
int status = 0;
if (vp == NULL)
return -EINVAL;
/*
* The refcount cannot be zero before we decrement it,
* something is quite wrong if this happens.
*/
if (vp->refcount == 0) {
kprintf("Cannot release vnode, bad refcount\n");
return -EIO;
}
/*
* Drop the reference and don't destroy the vnode
* if it's still not zero.
*/
if (atomic_dec_int(&vp->refcount) > 0)
return 0;
if (vops->reclaim != NULL)
status = vops->reclaim(vp);
if (status != 0)
return status;
vfs_vcache_enter(vp);
return status;
}
int
vfs_vop_lookup(struct vnode *vp, struct vop_lookup_args *args)
{
const struct vops *vops = vp->vops;
if (vops == NULL)
return -EIO;
if (vops->lookup == NULL)
return -EIO;
return vops->lookup(args);
}
int
vfs_vop_read(struct vnode *vp, struct sio_txn *sio)
{
const struct vops *vops = vp->vops;
if (vops == NULL)
return -EIO;
if (vops->read == NULL)
return -EIO;
return vops->read(vp, sio);
}
int
vfs_vop_getattr(struct vnode *vp, struct vop_getattr_args *args)
{
const struct vops *vops = vp->vops;
if (vops == NULL)
return -EIO;
if (vops->getattr == NULL)
return -EIO;
return vops->getattr(args);
}
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