X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/1c79356b52d46aa6b508fb032f5ae709b1f2897b..813fb2f63a553c957e917ede5f119b021d6ce391:/bsd/vm/dp_backing_file.c

diff --git a/bsd/vm/dp_backing_file.c b/bsd/vm/dp_backing_file.c
index 137e53eb6..2684c29dd 100644
--- a/bsd/vm/dp_backing_file.c
+++ b/bsd/vm/dp_backing_file.c
@@ -1,225 +1,186 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections.  This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
  */
 
-#include <mach/boolean.h>
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/lock.h>
-#include <sys/proc.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
 #include <sys/buf.h>
 #include <sys/uio.h>
-#include <sys/vnode.h>
+#include <sys/vnode_internal.h>
 #include <sys/namei.h>
-#include <sys/ubc.h>
+#include <sys/ubc_internal.h>
+#include <sys/malloc.h>
+#include <sys/user.h>
+
+#include <default_pager/default_pager_types.h>
+
+#include <security/audit/audit.h>
+#include <bsm/audit_kevents.h>
 
 #include <mach/mach_types.h>
-#include <vm/vm_map.h>
-#include <vm/vm_kern.h>
+#include <mach/host_priv.h>
+#include <mach/mach_traps.h>
+#include <mach/boolean.h>
+
+#include <kern/kern_types.h>
+#include <kern/locks.h>
 #include <kern/host.h>
-#include <kern/parallel.h>
+#include <kern/task.h>
 #include <kern/zalloc.h>
 #include <kern/kalloc.h>
+#include <kern/assert.h>
+#include <kern/policy_internal.h>
+
 #include <libkern/libkern.h>
-#include <sys/malloc.h>
 
+#include <vm/vm_pageout.h>
+#include <vm/vm_map.h>
+#include <vm/vm_kern.h>
 #include <vm/vnode_pager.h>
+#include <vm/vm_protos.h>
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#include <pexpert/pexpert.h>
+
 
 /*
- * temporary support for delayed instantiation
- * of default_pager
+ *	Routine:	macx_backing_store_recovery
+ *	Function:
+ *		Syscall interface to set a tasks privilege
+ *		level so that it is not subject to 
+ *		macx_backing_store_suspend
  */
-int default_pager_init_flag = 0;
+int
+macx_backing_store_recovery(
+	__unused struct macx_backing_store_recovery_args *args)
+{
+	assert(FALSE);
 
-struct bs_map		bs_port_table[MAX_BACKING_STORE] = { 
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
-	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}};
+	return ENOTSUP;
+}
 
-/* ###################################################### */
+/*
+ *	Routine:	macx_backing_store_suspend
+ *	Function:
+ *		Syscall interface to stop new demand for 
+ *		backing store when backing store is low
+ */
 
+int
+macx_backing_store_suspend(
+	__unused struct macx_backing_store_suspend_args *args)
+{
+	assert(FALSE);
 
-#include <kern/assert.h>
+	return ENOTSUP;
+}
+
+
+extern boolean_t compressor_store_stop_compaction;
 
 /*
- *	Routine:	macx_swapon
+ *	Routine:	macx_backing_store_compaction
  *	Function:
- *		Syscall interface to add a file to backing store
+ *		Turn compaction of swap space on or off.  This is
+ *		used during shutdown/restart so	that the kernel 
+ *		doesn't waste time compacting swap files that are 
+ *		about to be deleted anyway.  Compaction	is always 
+ *		on by default when the system comes up and is turned 
+ *		off when a shutdown/restart is requested.  It is 
+ *		re-enabled if the shutdown/restart is aborted for any reason.
+ *
+ *  This routine assumes macx_lock has been locked by macx_triggers ->
+ *      mach_macx_triggers -> macx_backing_store_compaction
  */
+
 int
-macx_swapon(
-	char 	*filename,
-	int	flags,
-	long	size,
-	long	priority)
+macx_backing_store_compaction(int flags)
 {
-	struct vnode		*vp = 0; 
-	struct nameidata 	nd, *ndp;
-	struct proc		*p =  current_proc();
-	pager_file_t		pf;
-	register int		error;
-	kern_return_t		kr;
-	mach_port_t		backing_store;
-	mach_port_t		default_pager_port = MACH_PORT_NULL;
-	int			i;
-	boolean_t		funnel_state;
-
-	struct vattr	vattr;
-
-	funnel_state = thread_funnel_set(kernel_flock, TRUE);
-	ndp = &nd;
-
-	if ((error = suser(p->p_ucred, &p->p_acflag)))
-		goto swapon_bailout;
-
-	unix_master();
-
-	if(default_pager_init_flag == 0) {
-		start_def_pager(NULL);
-		default_pager_init_flag = 1;
-	}
+	int error;
 
-	/*
-	 * Get a vnode for the paging area.
-	 */
-	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
-	    filename, p);
+	if ((error = suser(kauth_cred_get(), 0)))
+		return error;
 
-	if ((error = namei(ndp)))
-		goto swapon_bailout;
-	vp = ndp->ni_vp;
+	if (flags & SWAP_COMPACT_DISABLE) {
+		compressor_store_stop_compaction = TRUE;
 
-	if (vp->v_type != VREG) {
-		error = EINVAL;
-	        VOP_UNLOCK(vp, 0, p);
-		goto swapon_bailout;
-	}
-	UBCINFOCHECK("macx_swapon", vp);
+		kprintf("compressor_store_stop_compaction = TRUE\n");
 
-	if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) {
-	        VOP_UNLOCK(vp, 0, p);
-		goto swapon_bailout;
-	}
+	} else if (flags & SWAP_COMPACT_ENABLE) {
+		compressor_store_stop_compaction = FALSE;
 
-	if (vattr.va_size < (u_quad_t)size) {
-		vattr_null(&vattr);
-		vattr.va_size = (u_quad_t)size;
-		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
-		if (error) {
-			VOP_UNLOCK(vp, 0, p);
-			goto swapon_bailout;
-		}
+		kprintf("compressor_store_stop_compaction = FALSE\n");
 	}
 
-	/* add new backing store to list */
-	i = 0;
-	while(bs_port_table[i].vp != 0) {
-		if(i == MAX_BACKING_STORE)
-			break;
-		i++;
-	}
-	if(i == MAX_BACKING_STORE) {
-	   	error = ENOMEM;
-	        VOP_UNLOCK(vp, 0, p);
-		goto swapon_bailout;
-	}
+	return 0;
+}
 
-	/* remember the vnode. This vnode has namei() reference */
-	bs_port_table[i].vp = vp;
-	
-	/*
-	 * Look to see if we are already paging to this file.
-	 */
-	/* make certain the copy send of kernel call will work */
-	kr = host_default_memory_manager(host_priv_self(), &default_pager_port, 0);
-	if(kr != KERN_SUCCESS) {
-	   error = EAGAIN;
-	   VOP_UNLOCK(vp, 0, p);
-	   bs_port_table[i].vp = 0;
-	   goto swapon_bailout;
-	}
+/*
+ *	Routine:	macx_triggers
+ *	Function:
+ *		Syscall interface to set the call backs for low and
+ *		high water marks.
+ */
+int
+macx_triggers(
+	struct macx_triggers_args *args)
+{
+	int	flags = args->flags;
 
-	kr = default_pager_backing_store_create(default_pager_port, 
-					-1, /* default priority */
-					0, /* default cluster size */
-					&backing_store);
-	if(kr != KERN_SUCCESS) {
-	   error = ENOMEM;
-	   VOP_UNLOCK(vp, 0, p);
-	   bs_port_table[i].vp = 0;
-	   goto swapon_bailout;
-	}
+	if (flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE))
+		return (macx_backing_store_compaction(flags));
 
-	/*
-	 * NOTE: we are able to supply PAGE_SIZE here instead of
-	 *	an actual record size or block number because:
-	 *	a: we do not support offsets from the beginning of the
-	 *		file (allowing for non page size/record modulo offsets.
-	 *	b: because allow paging will be done modulo page size
-	 */
-
-	VOP_UNLOCK(vp, 0, p);
-	kr = default_pager_add_file(backing_store, vp, PAGE_SIZE, 
-			((int)vattr.va_size)/PAGE_SIZE);
-	if(kr != KERN_SUCCESS) {
-	   bs_port_table[i].vp = 0;
-	   if(kr == KERN_INVALID_ARGUMENT)
-		error = EINVAL;
-	   else 
-		error = ENOMEM;
-	   goto swapon_bailout;
-	}
-	bs_port_table[i].bs = (void *)backing_store;
-	error = 0;
-	if (!ubc_hold(vp))
-		panic("macx_swapon: hold");
-
-	/* Mark this vnode as being used for swapfile */
-	SET(vp->v_flag, VSWAP);
-
-	/*
-	 * take an extra reference on the vnode to keep
-	 * vnreclaim() away from this vnode.
-	 */
-	VREF(vp);
-
-	/* Hold on to the namei  reference to the paging file vnode */
-	vp = 0;
-
-swapon_bailout:
-	if (vp) {
-		vrele(vp);
-	}
-	unix_release();
-	(void) thread_funnel_set(kernel_flock, FALSE);
-	return(error);
+	assert(FALSE);
+
+	return ENOTSUP;
+}
+
+
+int
+macx_swapon(
+	__unused struct macx_swapon_args *args)
+{
+	assert(FALSE);
+
+	return ENOTSUP;
 }
 
+
 /*
  *	Routine:	macx_swapoff
  *	Function:
@@ -227,87 +188,42 @@ swapon_bailout:
  */
 int
 macx_swapoff(
-	char 	*filename,
-	int	flags)
+	__unused struct macx_swapoff_args *args)
 {
-	kern_return_t	kr;
-	mach_port_t	backing_store;
-
-	struct vnode		*vp = 0; 
-	struct nameidata 	nd, *ndp;
-	struct proc		*p =  current_proc();
-	int			i;
-	int			error;
-	boolean_t		funnel_state;
-
-	funnel_state = thread_funnel_set(kernel_flock, TRUE);
-	backing_store = NULL;
-	ndp = &nd;
-
-	if ((error = suser(p->p_ucred, &p->p_acflag)))
-		goto swapoff_bailout;
-
-	unix_master();
-
-	/*
-	 * Get the vnode for the paging area.
-	 */
-	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
-	    filename, p);
-
-	if ((error = namei(ndp)))
-		goto swapoff_bailout;
-	vp = ndp->ni_vp;
-
-	if (vp->v_type != VREG) {
-		error = EINVAL;
-		VOP_UNLOCK(vp, 0, p);
-		goto swapoff_bailout;
-	}
+	assert(FALSE);
 
-	for(i = 0; i < MAX_BACKING_STORE; i++) {
-		if(bs_port_table[i].vp == vp) {
-			backing_store; 
-			break;
-		}
-	}
-	if (i == MAX_BACKING_STORE) {
-		error = EINVAL;
-		VOP_UNLOCK(vp, 0, p);
-		goto swapoff_bailout;
-	}
-	backing_store = (mach_port_t)bs_port_table[i].bs;
-
-	VOP_UNLOCK(vp, 0, p);
-	kr = default_pager_backing_store_delete(backing_store);
-	switch (kr) {
-		case KERN_SUCCESS:
-			error = 0;
-			bs_port_table[i].vp = 0;
-			ubc_rele(vp);
-			/* This vnode is no longer used for swapfile */
-			CLR(vp->v_flag, VSWAP);
-
-			/* get rid of macx_swapon() namei() reference */
-			vrele(vp);
-
-			/* get rid of macx_swapon() "extra" reference */
-			vrele(vp);
-			break;
-		case KERN_FAILURE:
-			error = EAGAIN;
-			break;
-		default:
-			error = EAGAIN;
-			break;
-	}
+	return ENOTSUP;
+}
 
-swapoff_bailout:
-	/* get rid of macx_swapoff() namei() reference */
-	if (vp)
-		vrele(vp);
+/*
+ *	Routine:	macx_swapinfo
+ *	Function:
+ *		Syscall interface to get general swap statistics
+ */
+extern uint64_t vm_swap_get_total_space(void);
+extern uint64_t vm_swap_get_free_space(void);
+extern boolean_t vm_swap_up;
 
-	unix_release();
-	(void) thread_funnel_set(kernel_flock, FALSE);
-	return(error);
+int
+macx_swapinfo(
+	memory_object_size_t	*total_p,
+	memory_object_size_t	*avail_p,
+	vm_size_t		*pagesize_p,
+	boolean_t		*encrypted_p)
+{
+	if (VM_CONFIG_SWAP_IS_PRESENT) {
+
+		*total_p = vm_swap_get_total_space();
+		*avail_p = vm_swap_get_free_space();
+		*pagesize_p = (vm_size_t)PAGE_SIZE_64;
+		*encrypted_p = TRUE;
+
+	} else {
+		
+		*total_p = 0;
+		*avail_p = 0;
+		*pagesize_p = 0;
+		*encrypted_p = FALSE;
+	}
+	return 0;
 }