relay.c

/*
 * Public API and common code for kernel->userspace relay file support.
 *
 * See Documentation/filesystems/relay.txt for an overview.
 *
 * Copyright (C) 2002-2005 - Tom Zanussi (zanussi@us.ibm.com), IBM Corp
 * Copyright (C) 1999-2005 - Karim Yaghmour (karim@opersys.com)
 *
 * Moved to kernel/relay.c by Paul Mundt, 2006.
 * November 2006 - CPU hotplug support by Mathieu Desnoyers
 * 	(mathieu.desnoyers@polymtl.ca)
 *
 * This file is released under the GPL.
 */
#include <linux/errno.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/string.h>
#include <linux/relay.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/splice.h>

/* list of open channels, for cpu hotplug */
static DEFINE_MUTEX(relay_channels_mutex);
static LIST_HEAD(relay_channels);

/*
 * close() vm_op implementation for relay file mapping.
 */
static void relay_file_mmap_close(struct vm_area_struct *vma)
{
	struct rchan_buf *buf = vma->vm_private_data;
	buf->chan->cb->buf_unmapped(buf, vma->vm_file);
}

/*
 * fault() vm_op implementation for relay file mapping.
 */
static int relay_buf_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct page *page;
	struct rchan_buf *buf = vma->vm_private_data;
	pgoff_t pgoff = vmf->pgoff;

	if (!buf)
		return VM_FAULT_OOM;

	page = vmalloc_to_page(buf->start + (pgoff << PAGE_SHIFT));
	if (!page)
		return VM_FAULT_SIGBUS;
	get_page(page);
	vmf->page = page;

	return 0;
}

/*
 * vm_ops for relay file mappings.
 */
static const struct vm_operations_struct relay_file_mmap_ops = {
	.fault = relay_buf_fault,
	.close = relay_file_mmap_close,
};

/*
 * allocate an array of pointers of struct page
 */