osfmk/vm/vm_compressor_backing_store.h

   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
  58 char    swapfilename[MAX_SWAPFILENAME_LEN + 1];
  59
  60
  61 #define SWAP_SLOT_MASK          0x1FFFFFFFF
  62 #define SWAP_DEVICE_SHIFT       33
  63
  64 extern int              vm_num_swap_files;
  65
  66 struct swapfile;
  67 lck_grp_attr_t  vm_swap_data_lock_grp_attr;
  68 lck_grp_t       vm_swap_data_lock_grp;
  69 lck_attr_t      vm_swap_data_lock_attr;
  70 lck_mtx_ext_t   vm_swap_data_lock_ext;
  71 lck_mtx_t       vm_swap_data_lock;
  72
  73 void vm_swap_init(void);
  74 boolean_t vm_swap_create_file(void);
  75 kern_return_t vm_swap_put(vm_offset_t, uint64_t*, uint64_t, c_segment_t);
  76 void vm_swap_flush(void);
  77 void vm_swap_reclaim(void);
  78 void vm_swap_encrypt(c_segment_t);
  79 uint64_t vm_swap_get_total_space(void);
  80 uint64_t vm_swap_get_used_space(void);
  81 uint64_t vm_swap_get_free_space(void);
  82
  83 struct vnode;
  84 extern void vm_swapfile_open(const char *path, struct vnode **vp);
  85 extern void vm_swapfile_close(uint64_t path, struct vnode *vp);
  86 extern int vm_swapfile_preallocate(struct vnode *vp, uint64_t *size, boolean_t *pin);
  87 extern uint64_t vm_swapfile_get_blksize(struct vnode *vp);
  88 extern uint64_t vm_swapfile_get_transfer_size(struct vnode *vp);
  89 extern int vm_swapfile_io(struct vnode *vp, uint64_t offset, uint64_t start, int npages, int flags);
  90
  91 #if RECORD_THE_COMPRESSED_DATA
  92 extern int vm_record_file_write(struct vnode *vp, uint64_t offset, char *buf, int size);
  93 #endif
  94