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 <vm/vm_kern.h> 32 #include <mach/kern_return.h> 33 #include <kern/queue.h> 34 #include <vm/vm_pageout.h> 35 #include <vm/vm_protos.h> 36 #include <vm/vm_compressor.h> 37 #include <libkern/crypto/aes.h> 38 #include <kern/host_statistics.h> 39 40 #if !XNU_TARGET_OS_OSX 41 42 #define MIN_SWAP_FILE_SIZE (64 * 1024 * 1024ULL) 43 44 #define MAX_SWAP_FILE_SIZE (128 * 1024 * 1024ULL) 45 46 #else /* !XNU_TARGET_OS_OSX */ 47 48 #define MIN_SWAP_FILE_SIZE (256 * 1024 * 1024ULL) 49 50 #define MAX_SWAP_FILE_SIZE (1 * 1024 * 1024 * 1024ULL) 51 52 #endif /* !XNU_TARGET_OS_OSX */ 53 54 #if defined(XNU_TARGET_OS_OSX) 55 #define SWAP_FILE_NAME "/System/Volumes/VM/swapfile" 56 #else 57 #define SWAP_FILE_NAME "/private/var/vm/swapfile" 58 #endif 59 60 #define SWAPFILENAME_LEN (int)(strlen(SWAP_FILE_NAME)) 61 62 63 #define SWAP_SLOT_MASK 0x1FFFFFFFF 64 #define SWAP_DEVICE_SHIFT 33 65 66 extern int vm_num_swap_files; 67 68 struct swapfile; 69 70 void vm_swap_init(void); 71 boolean_t vm_swap_create_file(void); 72 73 74 struct swapout_io_completion { 75 int swp_io_busy; 76 int swp_io_done; 77 int swp_io_error; 78 79 uint32_t swp_c_size; 80 c_segment_t swp_c_seg; 81 82 struct swapfile *swp_swf; 83 uint64_t swp_f_offset; 84 85 struct upl_io_completion swp_upl_ctx; 86 }; 87 void vm_swapout_iodone(void *, int); 88 89 90 kern_return_t vm_swap_put_finish(struct swapfile *, uint64_t *, int, boolean_t); 91 kern_return_t vm_swap_put(vm_offset_t, uint64_t*, uint32_t, c_segment_t, struct swapout_io_completion *); 92 93 void vm_swap_flush(void); 94 void vm_swap_reclaim(void); 95 void vm_swap_encrypt(c_segment_t); 96 uint64_t vm_swap_get_total_space(void); 97 uint64_t vm_swap_get_used_space(void); 98 uint64_t vm_swap_get_free_space(void); 99 uint64_t vm_swap_get_max_configured_space(void); 100 void vm_swap_reset_max_segs_tracking(uint64_t *alloced_max, uint64_t *used_max); 101 102 struct vnode; 103 extern void vm_swapfile_open(const char *path, struct vnode **vp); 104 extern void vm_swapfile_close(uint64_t path, struct vnode *vp); 105 extern int vm_swapfile_preallocate(struct vnode *vp, uint64_t *size, boolean_t *pin); 106 extern uint64_t vm_swapfile_get_blksize(struct vnode *vp); 107 extern uint64_t vm_swapfile_get_transfer_size(struct vnode *vp); 108 extern int vm_swapfile_io(struct vnode *vp, uint64_t offset, uint64_t start, int npages, int flags, void *upl_ctx); 109 110 #if CONFIG_FREEZE 111 boolean_t vm_swap_max_budget(uint64_t *); 112 int vm_swap_vol_get_budget(struct vnode* vp, uint64_t *freeze_daily_budget); 113 #endif /* CONFIG_FREEZE */ 114 115 #if RECORD_THE_COMPRESSED_DATA 116 extern int vm_record_file_write(struct vnode *vp, uint64_t offset, char *buf, int size); 117 #endif 118