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/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io)
* Copyright (c) 2017 Mellanox Technologies, Ltd.
* 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 unmodified, 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/rwlock.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_object.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/shmem_fs.h>
struct page *
linux_shmem_read_mapping_page_gfp(vm_object_t obj, int pindex, gfp_t gfp)
{
vm_page_t page;
int rv;
if ((gfp & GFP_NOWAIT) != 0)
panic("GFP_NOWAIT is unimplemented");
VM_OBJECT_WLOCK(obj);
rv = vm_page_grab_valid(&page, obj, pindex, VM_ALLOC_NORMAL |
VM_ALLOC_NOBUSY | VM_ALLOC_WIRED);
VM_OBJECT_WUNLOCK(obj);
if (rv != VM_PAGER_OK)
return (ERR_PTR(-EINVAL));
return (page);
}
struct linux_file *
linux_shmem_file_setup(const char *name, loff_t size, unsigned long flags)
{
struct fileobj {
struct linux_file file __aligned(sizeof(void *));
struct vnode vnode __aligned(sizeof(void *));
};
struct fileobj *fileobj;
struct linux_file *filp;
struct vnode *vp;
int error;
fileobj = kzalloc(sizeof(*fileobj), GFP_KERNEL);
if (fileobj == NULL) {
error = -ENOMEM;
goto err_0;
}
filp = &fileobj->file;
vp = &fileobj->vnode;
filp->f_count = 1;
filp->f_vnode = vp;
filp->f_shmem = vm_pager_allocate(OBJT_DEFAULT, NULL, size,
VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred);
if (filp->f_shmem == NULL) {
error = -ENOMEM;
goto err_1;
}
return (filp);
err_1:
kfree(filp);
err_0:
return (ERR_PTR(error));
}
static vm_ooffset_t
linux_invalidate_mapping_pages_sub(vm_object_t obj, vm_pindex_t start,
vm_pindex_t end, int flags)
{
int start_count, end_count;
VM_OBJECT_WLOCK(obj);
start_count = obj->resident_page_count;
vm_object_page_remove(obj, start, end, flags);
end_count = obj->resident_page_count;
VM_OBJECT_WUNLOCK(obj);
return (start_count - end_count);
}
unsigned long
linux_invalidate_mapping_pages(vm_object_t obj, pgoff_t start, pgoff_t end)
{
return (linux_invalidate_mapping_pages_sub(obj, start, end, OBJPR_CLEANONLY));
}
void
linux_shmem_truncate_range(vm_object_t obj, loff_t lstart, loff_t lend)
{
vm_pindex_t start = OFF_TO_IDX(lstart + PAGE_SIZE - 1);
vm_pindex_t end = OFF_TO_IDX(lend + 1);
(void) linux_invalidate_mapping_pages_sub(obj, start, end, 0);
}
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