bsd/vm/dp_backing_file.c

   1 /*
   2  * Copyright (c) 2000-2010 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  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  30  * support for mandatory and extensible security protections.  This notice
  31  * is included in support of clause 2.2 (b) of the Apple Public License,
  32  * Version 2.0.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/lock.h>
  38 #include <sys/proc_internal.h>
  39 #include <sys/kauth.h>
  40 #include <sys/buf.h>
  41 #include <sys/uio.h>
  42 #include <sys/vnode_internal.h>
  43 #include <sys/namei.h>
  44 #include <sys/ubc_internal.h>
  45 #include <sys/malloc.h>
  46 #include <sys/user.h>
  47
  48 #include <default_pager/default_pager_types.h>
  49
  50 #include <security/audit/audit.h>
  51 #include <bsm/audit_kevents.h>
  52
  53 #include <mach/mach_types.h>
  54 #include <mach/host_priv.h>
  55 #include <mach/mach_traps.h>
  56 #include <mach/boolean.h>
  57
  58 #include <kern/kern_types.h>
  59 #include <kern/locks.h>
  60 #include <kern/host.h>
  61 #include <kern/task.h>
  62 #include <kern/zalloc.h>
  63 #include <kern/kalloc.h>
  64 #include <kern/policy_internal.h>
  65
  66 #include <libkern/libkern.h>
  67
  68 #include <vm/vm_pageout.h>
  69 #include <vm/vm_map.h>
  70 #include <vm/vm_kern.h>
  71 #include <vm/vnode_pager.h>
  72 #include <vm/vm_protos.h>
  73 #if CONFIG_MACF
  74 #include <security/mac_framework.h>
  75 #endif
  76
  77 #include <pexpert/pexpert.h>
  78
  79
  80 /*
  81  *      Routine:        macx_backing_store_recovery
  82  *      Function:
  83  *              Syscall interface to set a tasks privilege
  84  *              level so that it is not subject to
  85  *              macx_backing_store_suspend
  86  */
  87 int
  88 macx_backing_store_recovery(
  89         __unused struct macx_backing_store_recovery_args *args)
  90 {
  91         return ENOTSUP;
  92 }
  93
  94 /*
  95  *      Routine:        macx_backing_store_suspend
  96  *      Function:
  97  *              Syscall interface to stop new demand for
  98  *              backing store when backing store is low
  99  */
 100
 101 int
 102 macx_backing_store_suspend(
 103         __unused struct macx_backing_store_suspend_args *args)
 104 {
 105         return ENOTSUP;
 106 }
 107
 108
 109 extern boolean_t compressor_store_stop_compaction;
 110
 111 /*
 112  *      Routine:        macx_backing_store_compaction
 113  *      Function:
 114  *              Turn compaction of swap space on or off.  This is
 115  *              used during shutdown/restart so that the kernel
 116  *              doesn't waste time compacting swap files that are
 117  *              about to be deleted anyway.  Compaction is always
 118  *              on by default when the system comes up and is turned
 119  *              off when a shutdown/restart is requested.  It is
 120  *              re-enabled if the shutdown/restart is aborted for any reason.
 121  *
 122  *  This routine assumes macx_lock has been locked by macx_triggers ->
 123  *      mach_macx_triggers -> macx_backing_store_compaction
 124  */
 125
 126 int
 127 macx_backing_store_compaction(int flags)
 128 {
 129         int error;
 130
 131         if ((error = suser(kauth_cred_get(), 0))) {
 132                 return error;
 133         }
 134
 135         if (flags & SWAP_COMPACT_DISABLE) {
 136                 compressor_store_stop_compaction = TRUE;
 137
 138                 kprintf("compressor_store_stop_compaction = TRUE\n");
 139         } else if (flags & SWAP_COMPACT_ENABLE) {
 140                 compressor_store_stop_compaction = FALSE;
 141
 142                 kprintf("compressor_store_stop_compaction = FALSE\n");
 143         }
 144
 145         return 0;
 146 }
 147
 148 /*
 149  *      Routine:        macx_triggers
 150  *      Function:
 151  *              Syscall interface to set the call backs for low and
 152  *              high water marks.
 153  */
 154 int
 155 macx_triggers(
 156         struct macx_triggers_args *args)
 157 {
 158         int     flags = args->flags;
 159
 160         if (flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE)) {
 161                 return macx_backing_store_compaction(flags);
 162         }
 163
 164         return ENOTSUP;
 165 }
 166
 167
 168 int
 169 macx_swapon(
 170         __unused struct macx_swapon_args *args)
 171 {
 172         return ENOTSUP;
 173 }
 174
 175
 176 /*
 177  *      Routine:        macx_swapoff
 178  *      Function:
 179  *              Syscall interface to remove a file from backing store
 180  */
 181 int
 182 macx_swapoff(
 183         __unused struct macx_swapoff_args *args)
 184 {
 185         return ENOTSUP;
 186 }
 187
 188 /*
 189  *      Routine:        macx_swapinfo
 190  *      Function:
 191  *              Syscall interface to get general swap statistics
 192  */
 193 extern uint64_t vm_swap_get_total_space(void);
 194 extern uint64_t vm_swap_get_free_space(void);
 195 extern boolean_t vm_swap_up;
 196
 197 int
 198 macx_swapinfo(
 199         memory_object_size_t    *total_p,
 200         memory_object_size_t    *avail_p,
 201         vm_size_t               *pagesize_p,
 202         boolean_t               *encrypted_p)
 203 {
 204         if (VM_CONFIG_SWAP_IS_PRESENT) {
 205                 *total_p = vm_swap_get_total_space();
 206                 *avail_p = vm_swap_get_free_space();
 207                 *pagesize_p = (vm_size_t)PAGE_SIZE_64;
 208                 *encrypted_p = TRUE;
 209         } else {
 210                 *total_p = 0;
 211                 *avail_p = 0;
 212                 *pagesize_p = 0;
 213                 *encrypted_p = FALSE;
 214         }
 215         return 0;
 216 }