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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 <vm/obj.h>
#include <vm/dynalloc.h>
#include <sys/errno.h>
#include <string.h>
static size_t obj_count = 0;
static void
vm_set_pgops(struct vm_object *obj, struct vnode *vnode)
{
if (vnode == NULL) {
obj->vnode = NULL;
return;
}
/* Is this a device? */
if (vnode->type == VCHR || vnode->type == VBLK) {
obj->pgops = &g_dev_pagerops;
} else {
obj->pgops = &g_vnode_pagerops;
}
}
int
vm_obj_init(struct vm_object **res, struct vnode *vnode)
{
struct vm_object *obj = dynalloc(sizeof(struct vm_object));
if (obj == NULL) {
return -ENOMEM;
}
memset(obj, 0, sizeof(struct vm_object));
obj->vnode = vnode;
obj->ref = 0;
vm_set_pgops(obj, vnode);
*res = obj;
++obj_count;
return 0;
}
int
vm_obj_destroy(struct vm_object *obj)
{
struct vnode *vp = obj->vnode;
/* Check the ref count */
if (obj->ref > 0)
return -EBUSY;
if (vp != NULL)
vp->vmobj = NULL;
dynfree(obj);
--obj_count;
return 0;
}
size_t
vm_obj_count(void)
{
return obj_count;
}
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