1/*
2 * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29#include <kern/kern_types.h>
30#include <kern/locks.h>
31#include <kern/kalloc.h>
32#include <vm/vm_kern.h>
33#include <mach/kern_return.h>
34#include <kern/queue.h>
35#include <vm/vm_pageout.h>
36#include <vm/vm_protos.h>
37#include <vm/vm_compressor.h>
38#include <libkern/crypto/aes.h>
39#include <kern/host_statistics.h>
40
41
42#define MIN_SWAP_FILE_SIZE		(256 * 1024 * 1024)
43
44#define MAX_SWAP_FILE_SIZE		(1 * 1024 * 1024 * 1024)
45
46
47#define	COMPRESSED_SWAP_CHUNK_SIZE	(C_SEG_BUFSIZE)
48
49#define VM_SWAPFILE_HIWATER_SEGS	(MIN_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE)
50
51#define SWAPFILE_RECLAIM_THRESHOLD_SEGS	((17 * (MAX_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE)) / 10)
52#define SWAPFILE_RECLAIM_MINIMUM_SEGS	((13 * (MAX_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE)) / 10)
53
54
55#define SWAP_FILE_NAME		"/var/vm/swapfile"
56#define SWAPFILENAME_LEN	(int)(strlen(SWAP_FILE_NAME))
57
58char	swapfilename[MAX_SWAPFILENAME_LEN + 1];
59
60
61#define SWAP_SLOT_MASK		0x1FFFFFFFF
62#define SWAP_DEVICE_SHIFT	33
63
64extern int		vm_num_swap_files;
65extern boolean_t	vm_swap_up;
66
67struct swapfile;
68lck_grp_attr_t	vm_swap_data_lock_grp_attr;
69lck_grp_t	vm_swap_data_lock_grp;
70lck_attr_t	vm_swap_data_lock_attr;
71lck_mtx_ext_t	vm_swap_data_lock_ext;
72lck_mtx_t	vm_swap_data_lock;
73
74void vm_swap_init(void);
75boolean_t vm_swap_create_file(void);
76kern_return_t vm_swap_put(vm_offset_t, uint64_t*, uint64_t, c_segment_t);
77void vm_swap_flush(void);
78void vm_swap_reclaim(void);
79void vm_swap_encrypt(c_segment_t);
80uint64_t vm_swap_get_total_space(void);
81uint64_t vm_swap_get_used_space(void);
82uint64_t vm_swap_get_free_space(void);
83
84struct vnode;
85extern void vm_swapfile_open(const char *path, struct vnode **vp);
86extern void vm_swapfile_close(uint64_t path, struct vnode *vp);
87extern int vm_swapfile_preallocate(struct vnode *vp, uint64_t *size);
88extern uint64_t vm_swapfile_get_blksize(struct vnode *vp);
89extern uint64_t vm_swapfile_get_transfer_size(struct vnode *vp);
90extern int vm_swapfile_io(struct vnode *vp, uint64_t offset, uint64_t start, int npages, int flags);
91
92
93