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 SANITY_CHECK_SWAP_ROUTINES 0 43 44#if SANITY_CHECK_SWAP_ROUTINES 45 46#define MIN_SWAP_FILE_SIZE (4 * 1024) 47 48#define MAX_SWAP_FILE_SIZE (4 * 1024) 49 50#define COMPRESSED_SWAP_CHUNK_SIZE (4 * 1024) 51 52#define VM_SWAPFILE_HIWATER_SEGS (MIN_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE) 53 54#define SWAPFILE_RECLAIM_THRESHOLD_SEGS (MIN_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE) 55 56#else /* SANITY_CHECK_SWAP_ROUTINES */ 57 58 59#define MIN_SWAP_FILE_SIZE (256 * 1024 * 1024) 60 61#define MAX_SWAP_FILE_SIZE (1 * 1024 * 1024 * 1024) 62 63 64#define COMPRESSED_SWAP_CHUNK_SIZE (C_SEG_BUFSIZE) 65 66#define VM_SWAPFILE_HIWATER_SEGS (MIN_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE) 67 68#define SWAPFILE_RECLAIM_THRESHOLD_SEGS ((15 * (MAX_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE)) / 10) 69 70#endif /* SANITY_CHECK_SWAP_ROUTINES */ 71 72#define SWAP_FILE_NAME "/var/vm/swapfile" 73#define SWAPFILENAME_LEN (int)(strlen(SWAP_FILE_NAME)) 74#define SWAPFILENAME_INDEX_LEN 2 /* Doesn't include the terminating NULL character */ 75 76#define SWAP_SLOT_MASK 0x1FFFFFFFF 77#define SWAP_DEVICE_SHIFT 33 78 79extern int vm_num_swap_files; 80extern boolean_t vm_swap_up; 81 82struct swapfile; 83lck_grp_attr_t vm_swap_data_lock_grp_attr; 84lck_grp_t vm_swap_data_lock_grp; 85lck_attr_t vm_swap_data_lock_attr; 86lck_mtx_ext_t vm_swap_data_lock_ext; 87lck_mtx_t vm_swap_data_lock; 88 89void vm_swap_init(void); 90boolean_t vm_swap_create_file(void); 91kern_return_t vm_swap_put(vm_offset_t, uint64_t*, uint64_t, c_segment_t); 92void vm_swap_flush(void); 93void vm_swap_reclaim(void); 94void vm_swap_encrypt(c_segment_t); 95uint64_t vm_swap_get_total_space(void); 96uint64_t vm_swap_get_used_space(void); 97uint64_t vm_swap_get_free_space(void); 98 99struct vnode; 100extern void vm_swapfile_open(const char *path, struct vnode **vp); 101extern void vm_swapfile_close(uint64_t path, struct vnode *vp); 102extern int vm_swapfile_preallocate(struct vnode *vp, uint64_t *size); 103extern uint64_t vm_swapfile_get_blksize(struct vnode *vp); 104extern uint64_t vm_swapfile_get_transfer_size(struct vnode *vp); 105extern int vm_swapfile_io(struct vnode *vp, uint64_t offset, uint64_t start, int npages, int flags); 106 107 108