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	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	#if CONFIG_EMBEDDED
	42
	43	#define MIN_SWAP_FILE_SIZE (64 * 1024 * 1024)
	44
	45	#define MAX_SWAP_FILE_SIZE (128 * 1024 * 1024)
	46
	47	#else /* CONFIG_EMBEDDED */
	48
	49	#define MIN_SWAP_FILE_SIZE (256 * 1024 * 1024)
	50
	51	#define MAX_SWAP_FILE_SIZE (1 * 1024 * 1024 * 1024)
	52
	53	#endif /* CONFIG_EMBEDDED */
	54
	55	#define COMPRESSED_SWAP_CHUNK_SIZE (C_SEG_BUFSIZE)
	56
	57	#define VM_SWAPFILE_HIWATER_SEGS (MIN_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE)
	58
	59	#define SWAPFILE_RECLAIM_THRESHOLD_SEGS ((17 * (MAX_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE)) / 10)
	60	#define SWAPFILE_RECLAIM_MINIMUM_SEGS ((13 * (MAX_SWAP_FILE_SIZE / COMPRESSED_SWAP_CHUNK_SIZE)) / 10)
	61
	62
	63	#define SWAP_FILE_NAME "/private/var/vm/swapfile"
	64	#define SWAPFILENAME_LEN (int)(strlen(SWAP_FILE_NAME))
	65
	66
	67	#define SWAP_SLOT_MASK 0x1FFFFFFFF
	68	#define SWAP_DEVICE_SHIFT 33
	69
	70	extern int vm_num_swap_files;
	71
	72	struct swapfile;
	73	lck_grp_attr_t vm_swap_data_lock_grp_attr;
	74	lck_grp_t vm_swap_data_lock_grp;
	75	lck_attr_t vm_swap_data_lock_attr;
	76	lck_mtx_ext_t vm_swap_data_lock_ext;
	77	lck_mtx_t vm_swap_data_lock;
	78
	79	void vm_swap_init(void);
	80	boolean_t vm_swap_create_file(void);
	81
	82
	83	struct swapout_io_completion {
	84
	85	int swp_io_busy;
	86	int swp_io_done;
	87	int swp_io_error;
	88
	89	uint32_t swp_c_size;
	90	c_segment_t swp_c_seg;
	91
	92	struct swapfile *swp_swf;
	93	uint64_t swp_f_offset;
	94
	95	struct upl_io_completion swp_upl_ctx;
	96	};
	97	void vm_swapout_iodone(void *, int);
	98
	99
	100	static void vm_swapout_finish(c_segment_t, uint64_t, uint32_t, kern_return_t);
	101	kern_return_t vm_swap_put_finish(struct swapfile , uint64_t , int);
	102	kern_return_t vm_swap_put(vm_offset_t, uint64_t, uint32_t, c_segment_t, struct swapout_io_completion );
	103
	104	void vm_swap_flush(void);
	105	void vm_swap_reclaim(void);
	106	void vm_swap_encrypt(c_segment_t);
	107	uint64_t vm_swap_get_total_space(void);
	108	uint64_t vm_swap_get_used_space(void);
	109	uint64_t vm_swap_get_free_space(void);
	110
	111	struct vnode;
	112	extern void vm_swapfile_open(const char path, struct vnode *vp);
	113	extern void vm_swapfile_close(uint64_t path, struct vnode *vp);
	114	extern int vm_swapfile_preallocate(struct vnode vp, uint64_t size, boolean_t *pin);
	115	extern uint64_t vm_swapfile_get_blksize(struct vnode *vp);
	116	extern uint64_t vm_swapfile_get_transfer_size(struct vnode *vp);
	117	extern int vm_swapfile_io(struct vnode vp, uint64_t offset, uint64_t start, int npages, int flags, void upl_ctx);
	118
	119	#if CONFIG_FREEZE
	120	boolean_t vm_swap_max_budget(uint64_t *);
	121	int vm_swap_vol_get_budget(struct vnode* vp, uint64_t *freeze_daily_budget);
	122	#endif /* CONFIG_FREEZE */
	123
	124	#if RECORD_THE_COMPRESSED_DATA
	125	extern int vm_record_file_write(struct vnode vp, uint64_t offset, char buf, int size);
	126	#endif
	127