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/assert.h>
  65 #include <kern/policy_internal.h>
  66
  67 #include <libkern/libkern.h>
  68
  69 #include <vm/vm_pageout.h>
  70 #include <vm/vm_map.h>
  71 #include <vm/vm_kern.h>
  72 #include <vm/vnode_pager.h>
  73 #include <vm/vm_protos.h>
  74 #if CONFIG_MACF
  75 #include <security/mac_framework.h>
  76 #endif
  77
  78 #include <pexpert/pexpert.h>
  79
  80
  81 /*
  82  *      Routine:        macx_backing_store_recovery
  83  *      Function:
  84  *              Syscall interface to set a tasks privilege
  85  *              level so that it is not subject to
  86  *              macx_backing_store_suspend
  87  */
  88 int
  89 macx_backing_store_recovery(
  90         __unused struct macx_backing_store_recovery_args *args)
  91 {
  92         assert(FALSE);
  93
  94         return ENOTSUP;
  95 }
  96
  97 /*
  98  *      Routine:        macx_backing_store_suspend
  99  *      Function:
 100  *              Syscall interface to stop new demand for
 101  *              backing store when backing store is low
 102  */
 103
 104 int
 105 macx_backing_store_suspend(
 106         __unused struct macx_backing_store_suspend_args *args)
 107 {
 108         assert(FALSE);
 109
 110         return ENOTSUP;
 111 }
 112
 113
 114 extern boolean_t compressor_store_stop_compaction;
 115
 116 /*
 117  *      Routine:        macx_backing_store_compaction
 118  *      Function:
 119  *              Turn compaction of swap space on or off.  This is
 120  *              used during shutdown/restart so that the kernel
 121  *              doesn't waste time compacting swap files that are
 122  *              about to be deleted anyway.  Compaction is always
 123  *              on by default when the system comes up and is turned
 124  *              off when a shutdown/restart is requested.  It is
 125  *              re-enabled if the shutdown/restart is aborted for any reason.
 126  *
 127  *  This routine assumes macx_lock has been locked by macx_triggers ->
 128  *      mach_macx_triggers -> macx_backing_store_compaction
 129  */
 130
 131 int
 132 macx_backing_store_compaction(int flags)
 133 {
 134         int error;
 135
 136         if ((error = suser(kauth_cred_get(), 0)))
 137                 return error;
 138
 139         if (flags & SWAP_COMPACT_DISABLE) {
 140                 compressor_store_stop_compaction = TRUE;
 141
 142                 kprintf("compressor_store_stop_compaction = TRUE\n");
 143
 144         } else if (flags & SWAP_COMPACT_ENABLE) {
 145                 compressor_store_stop_compaction = FALSE;
 146
 147                 kprintf("compressor_store_stop_compaction = FALSE\n");
 148         }
 149
 150         return 0;
 151 }
 152
 153 /*
 154  *      Routine:        macx_triggers
 155  *      Function:
 156  *              Syscall interface to set the call backs for low and
 157  *              high water marks.
 158  */
 159 int
 160 macx_triggers(
 161         struct macx_triggers_args *args)
 162 {
 163         int     flags = args->flags;
 164
 165         if (flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE))
 166                 return (macx_backing_store_compaction(flags));
 167
 168         assert(FALSE);
 169
 170         return ENOTSUP;
 171 }
 172
 173
 174 int
 175 macx_swapon(
 176         __unused struct macx_swapon_args *args)
 177 {
 178         assert(FALSE);
 179
 180         return ENOTSUP;
 181 }
 182
 183
 184 /*
 185  *      Routine:        macx_swapoff
 186  *      Function:
 187  *              Syscall interface to remove a file from backing store
 188  */
 189 int
 190 macx_swapoff(
 191         __unused struct macx_swapoff_args *args)
 192 {
 193         assert(FALSE);
 194
 195         return ENOTSUP;
 196 }
 197
 198 /*
 199  *      Routine:        macx_swapinfo
 200  *      Function:
 201  *              Syscall interface to get general swap statistics
 202  */
 203 extern uint64_t vm_swap_get_total_space(void);
 204 extern uint64_t vm_swap_get_free_space(void);
 205 extern boolean_t vm_swap_up;
 206
 207 int
 208 macx_swapinfo(
 209         memory_object_size_t    *total_p,
 210         memory_object_size_t    *avail_p,
 211         vm_size_t               *pagesize_p,
 212         boolean_t               *encrypted_p)
 213 {
 214         if (VM_CONFIG_SWAP_IS_PRESENT) {
 215
 216                 *total_p = vm_swap_get_total_space();
 217                 *avail_p = vm_swap_get_free_space();
 218                 *pagesize_p = (vm_size_t)PAGE_SIZE_64;
 219                 *encrypted_p = TRUE;
 220
 221         } else {
 222
 223                 *total_p = 0;
 224                 *avail_p = 0;
 225                 *pagesize_p = 0;
 226                 *encrypted_p = FALSE;
 227         }
 228         return 0;
 229 }