[apple/xnu.git] / bsd / vm / dp_backing_file.c

/*
 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * 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.
 * 
 * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @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 <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/vnode_internal.h>
#include <sys/namei.h>
#include <sys/ubc_internal.h>
#include <sys/malloc.h>

#include <default_pager/default_pager_types.h>
#include <default_pager/default_pager_object.h>

#include <security/audit/audit.h>
#include <bsm/audit_kevents.h>

#include <mach/mach_types.h>
#include <mach/host_priv.h>
#include <mach/mach_traps.h>
#include <mach/boolean.h>

#include <kern/kern_types.h>
#include <kern/host.h>
#include <kern/task.h>
#include <kern/zalloc.h>
#include <kern/kalloc.h>
#include <kern/assert.h>

#include <libkern/libkern.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

/*
 * temporary support for delayed instantiation
 * of default_pager
 */
int default_pager_init_flag = 0;

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}};

/* ###################################################### */


/*
 *	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
macx_backing_store_recovery(
	struct macx_backing_store_recovery_args *args)
{
	int		pid = args->pid;
	int		error;
	struct proc	*p =  current_proc();
	boolean_t	funnel_state;

	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	if ((error = suser(kauth_cred_get(), 0)))
		goto backing_store_recovery_return;

	/* for now restrict backing_store_recovery */
	/* usage to only present task */
	if(pid != proc_selfpid()) {
		error = EINVAL;
		goto backing_store_recovery_return;
	}

	task_backing_store_privileged(p->task);

backing_store_recovery_return:
	(void) thread_funnel_set(kernel_flock, FALSE);
	return(error);
}

/*
 *	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(
	struct macx_backing_store_suspend_args *args)
{
	boolean_t	suspend = args->suspend;
	int		error;
	boolean_t	funnel_state;

	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	if ((error = suser(kauth_cred_get(), 0)))
		goto backing_store_suspend_return;

	vm_backing_store_disable(suspend);

backing_store_suspend_return:
	(void) thread_funnel_set(kernel_flock, FALSE);
	return(error);
}

extern boolean_t backing_store_stop_compaction;

/*
 *	Routine:	macx_backing_store_compaction
 *	Function:
 *		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.
 */

int
macx_backing_store_compaction(int flags)
{
	int error;

	if ((error = suser(kauth_cred_get(), 0)))
		return error;

	if (flags & SWAP_COMPACT_DISABLE) {
		backing_store_stop_compaction = TRUE;

	} else if (flags & SWAP_COMPACT_ENABLE) {
		backing_store_stop_compaction = FALSE;
	}

	return 0;
}

/*
 *	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	error;

	error = suser(kauth_cred_get(), 0);
	if (error)
		return error;

	return mach_macx_triggers(args);
}

/*
 *	Routine:	macx_swapon
 *	Function:
 *		Syscall interface to add a file to backing store
 */
int
macx_swapon(
	struct macx_swapon_args *args)
{
	int			size = args->size;
	vnode_t			vp = (vnode_t)NULL; 
	struct nameidata 	nd, *ndp;
	register int		error;
	kern_return_t		kr;
	mach_port_t		backing_store;
	memory_object_default_t	default_pager;
	int			i;
	boolean_t		funnel_state;
	off_t			file_size;
	vfs_context_t		ctx = vfs_context_current();
	struct proc		*p =  current_proc();

	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON);
	AUDIT_ARG(value32, args->priority);

	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	ndp = &nd;

	if ((error = suser(kauth_cred_get(), 0)))
		goto swapon_bailout;

	if(default_pager_init_flag == 0) {
		start_def_pager(NULL);
		default_pager_init_flag = 1;
	}

	/*
	 * Get a vnode for the paging area.
	 */
	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
	       ((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
	       (user_addr_t) args->filename, ctx);

	if ((error = namei(ndp)))
		goto swapon_bailout;
	nameidone(ndp);
	vp = ndp->ni_vp;

	if (vp->v_type != VREG) {
		error = EINVAL;
		goto swapon_bailout;
	}

	/* get file size */
	if ((error = vnode_size(vp, &file_size, ctx)) != 0)
		goto swapon_bailout;
#if CONFIG_MACF
	vnode_lock(vp);
	error = mac_system_check_swapon(vfs_context_ucred(ctx), vp);
	vnode_unlock(vp);
	if (error)
		goto swapon_bailout;
#endif

	/* resize to desired size if it's too small */
	if ((file_size < (off_t)size) && ((error = vnode_setsize(vp, (off_t)size, 0, ctx)) != 0))
		goto swapon_bailout;

	/* 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;
		goto swapon_bailout;
	}

	/* 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 */
	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
	if(kr != KERN_SUCCESS) {
	   error = EAGAIN;
	   bs_port_table[i].vp = 0;
	   goto swapon_bailout;
	}

	kr = default_pager_backing_store_create(default_pager, 
					-1, /* default priority */
					0, /* default cluster size */
					&backing_store);
	memory_object_default_deallocate(default_pager);

	if(kr != KERN_SUCCESS) {
	   error = ENOMEM;
	   bs_port_table[i].vp = 0;
	   goto swapon_bailout;
	}

	/* Mark this vnode as being used for swapfile */
	vnode_lock_spin(vp);
	SET(vp->v_flag, VSWAP);
	vnode_unlock(vp);

	/*
	 * 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
	 */

	kr = default_pager_add_file(backing_store, (vnode_ptr_t) vp,
				PAGE_SIZE, (int)(file_size/PAGE_SIZE));
	if(kr != KERN_SUCCESS) {
	   bs_port_table[i].vp = 0;
	   if(kr == KERN_INVALID_ARGUMENT)
		error = EINVAL;
	   else 
		error = ENOMEM;

	   /* This vnode is not to be used for swapfile */
	   vnode_lock_spin(vp);
	   CLR(vp->v_flag, VSWAP);
	   vnode_unlock(vp);

	   goto swapon_bailout;
	}
	bs_port_table[i].bs = (void *)backing_store;
	error = 0;

	ubc_setthreadcred(vp, p, current_thread());

	/*
	 * take a long term reference on the vnode to keep
	 * vnreclaim() away from this vnode.
	 */
	vnode_ref(vp);

swapon_bailout:
	if (vp) {
		vnode_put(vp);
	}
	(void) thread_funnel_set(kernel_flock, FALSE);
	AUDIT_MACH_SYSCALL_EXIT(error);
	return(error);
}

/*
 *	Routine:	macx_swapoff
 *	Function:
 *		Syscall interface to remove a file from backing store
 */
int
macx_swapoff(
	struct macx_swapoff_args *args)
{
	__unused int	flags = args->flags;
	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;
	vfs_context_t ctx = vfs_context_current();

	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPOFF);

	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	backing_store = NULL;
	ndp = &nd;

	if ((error = suser(kauth_cred_get(), 0)))
		goto swapoff_bailout;

	/*
	 * Get the vnode for the paging area.
	 */
	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
	       ((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
	       (user_addr_t) args->filename, ctx);

	if ((error = namei(ndp)))
		goto swapoff_bailout;
	nameidone(ndp);
	vp = ndp->ni_vp;

	if (vp->v_type != VREG) {
		error = EINVAL;
		goto swapoff_bailout;
	}
#if CONFIG_MACF
	vnode_lock(vp);
	error = mac_system_check_swapoff(vfs_context_ucred(ctx), vp);
	vnode_unlock(vp);
	if (error)
		goto swapoff_bailout;
#endif

	for(i = 0; i < MAX_BACKING_STORE; i++) {
		if(bs_port_table[i].vp == vp) {
			break;
		}
	}
	if (i == MAX_BACKING_STORE) {
		error = EINVAL;
		goto swapoff_bailout;
	}
	backing_store = (mach_port_t)bs_port_table[i].bs;

	kr = default_pager_backing_store_delete(backing_store);
	switch (kr) {
		case KERN_SUCCESS:
			error = 0;
			bs_port_table[i].vp = 0;
			/* This vnode is no longer used for swapfile */
			vnode_lock_spin(vp);
			CLR(vp->v_flag, VSWAP);
			vnode_unlock(vp);

			/* get rid of macx_swapon() "long term" reference */
			vnode_rele(vp);

			break;
		case KERN_FAILURE:
			error = EAGAIN;
			break;
		default:
			error = EAGAIN;
			break;
	}

swapoff_bailout:
	/* get rid of macx_swapoff() namei() reference */
	if (vp)
		vnode_put(vp);

	(void) thread_funnel_set(kernel_flock, FALSE);
	AUDIT_MACH_SYSCALL_EXIT(error);
	return(error);
}

/*
 *	Routine:	macx_swapinfo
 *	Function:
 *		Syscall interface to get general swap statistics
 */
int
macx_swapinfo(
	memory_object_size_t	*total_p,
	memory_object_size_t	*avail_p,
	vm_size_t		*pagesize_p,
	boolean_t		*encrypted_p)
{
	int			error;
	memory_object_default_t	default_pager;
	default_pager_info_64_t	dpi64;
	kern_return_t		kr;

	error = 0;

	/*
	 * Get a handle on the default pager.
	 */
	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
	if (kr != KERN_SUCCESS) {
		error = EAGAIN;	/* XXX why EAGAIN ? */
		goto done;
	}
	if (default_pager == MEMORY_OBJECT_DEFAULT_NULL) {
		/*
		 * The default pager has not initialized yet,
		 * so it can't be using any swap space at all.
		 */
		*total_p = 0;
		*avail_p = 0;
		*pagesize_p = 0;
		*encrypted_p = FALSE;
		goto done;
	}
	
	/*
	 * Get swap usage data from default pager.
	 */
	kr = default_pager_info_64(default_pager, &dpi64);
	if (kr != KERN_SUCCESS) {
		error = ENOTSUP;
		goto done;
	}

	/*
	 * Provide default pager info to caller.
	 */
	*total_p = dpi64.dpi_total_space;
	*avail_p = dpi64.dpi_free_space;
	*pagesize_p = dpi64.dpi_page_size;
	if (dpi64.dpi_flags & DPI_ENCRYPTED) {
		*encrypted_p = TRUE;
	} else {
		*encrypted_p = FALSE;
	}

done:
	if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) {
		/* release our handle on default pager */
		memory_object_default_deallocate(default_pager);
	}
	return error;
}
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	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.
8f6c56a5	25	*
2d21ac55 A	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.
1c79356b A	33	*/
1c79356b A	34
1c79356b A	35	#include <sys/param.h>
	36	#include <sys/systm.h>
	37	#include <sys/lock.h>
91447636 A	38	#include <sys/proc_internal.h>
91447636 A	39	#include <sys/kauth.h>
1c79356b A	40	#include <sys/buf.h>
1c79356b A	41	#include <sys/uio.h>
91447636	42	#include <sys/vnode_internal.h>
1c79356b	43	#include <sys/namei.h>
91447636 A	44	#include <sys/ubc_internal.h>
	45	#include <sys/malloc.h>
	46
	47	#include <default_pager/default_pager_types.h>
	48	#include <default_pager/default_pager_object.h>
1c79356b	49
b0d623f7	50	#include <security/audit/audit.h>
e5568f75 A	51	#include <bsm/audit_kevents.h>
e5568f75 A	52
1c79356b	53	#include <mach/mach_types.h>
91447636 A	54	#include <mach/host_priv.h>
	55	#include <mach/mach_traps.h>
	56	#include <mach/boolean.h>
	57
	58	#include <kern/kern_types.h>
1c79356b	59	#include <kern/host.h>
91447636	60	#include <kern/task.h>
1c79356b A	61	#include <kern/zalloc.h>
1c79356b A	62	#include <kern/kalloc.h>
91447636 A	63	#include <kern/assert.h>
91447636 A	64
1c79356b	65	#include <libkern/libkern.h>
1c79356b	66
91447636 A	67	#include <vm/vm_pageout.h>
	68	#include <vm/vm_map.h>
	69	#include <vm/vm_kern.h>
1c79356b	70	#include <vm/vnode_pager.h>
91447636	71	#include <vm/vm_protos.h>
2d21ac55 A	72	#if CONFIG_MACF
	73	#include <security/mac_framework.h>
	74	#endif
1c79356b A	75
	76	/*
	77	* temporary support for delayed instantiation
	78	* of default_pager
	79	*/
	80	int default_pager_init_flag = 0;
	81
	82	struct bs_map bs_port_table[MAX_BACKING_STORE] = {
	83	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	84	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	85	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	86	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	87	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	88	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	89	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	90	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	91	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	92	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}};
	93
	94	/* ###################################################### */
	95
	96
55e303ae A	97	/*
	98	* Routine: macx_backing_store_recovery
	99	* Function:
	100	* Syscall interface to set a tasks privilege
	101	* level so that it is not subject to
	102	* macx_backing_store_suspend
	103	*/
	104	int
	105	macx_backing_store_recovery(
91447636	106	struct macx_backing_store_recovery_args *args)
55e303ae	107	{
91447636	108	int pid = args->pid;
55e303ae A	109	int error;
	110	struct proc *p = current_proc();
	111	boolean_t funnel_state;
	112
	113	funnel_state = thread_funnel_set(kernel_flock, TRUE);
91447636	114	if ((error = suser(kauth_cred_get(), 0)))
55e303ae A	115	goto backing_store_recovery_return;
	116
	117	/* for now restrict backing_store_recovery */
	118	/* usage to only present task */
91447636	119	if(pid != proc_selfpid()) {
55e303ae A	120	error = EINVAL;
	121	goto backing_store_recovery_return;
	122	}
	123
	124	task_backing_store_privileged(p->task);
	125
	126	backing_store_recovery_return:
	127	(void) thread_funnel_set(kernel_flock, FALSE);
	128	return(error);
	129	}
	130
	131	/*
	132	* Routine: macx_backing_store_suspend
	133	* Function:
	134	* Syscall interface to stop new demand for
	135	* backing store when backing store is low
	136	*/
	137
	138	int
	139	macx_backing_store_suspend(
91447636	140	struct macx_backing_store_suspend_args *args)
55e303ae	141	{
91447636	142	boolean_t suspend = args->suspend;
55e303ae	143	int error;
55e303ae A	144	boolean_t funnel_state;
	145
	146	funnel_state = thread_funnel_set(kernel_flock, TRUE);
91447636	147	if ((error = suser(kauth_cred_get(), 0)))
55e303ae A	148	goto backing_store_suspend_return;
	149
	150	vm_backing_store_disable(suspend);
	151
	152	backing_store_suspend_return:
	153	(void) thread_funnel_set(kernel_flock, FALSE);
	154	return(error);
	155	}
	156
b0d623f7 A	157	extern boolean_t backing_store_stop_compaction;
	158
	159	/*
	160	* Routine: macx_backing_store_compaction
	161	* Function:
	162	* Turn compaction of swap space on or off. This is
	163	* used during shutdown/restart so that the kernel
	164	* doesn't waste time compacting swap files that are
	165	* about to be deleted anyway. Compaction is always
	166	* on by default when the system comes up and is turned
	167	* off when a shutdown/restart is requested. It is
	168	* re-enabled if the shutdown/restart is aborted for any reason.
	169	*/
	170
	171	int
	172	macx_backing_store_compaction(int flags)
	173	{
	174	int error;
	175
	176	if ((error = suser(kauth_cred_get(), 0)))
	177	return error;
	178
	179	if (flags & SWAP_COMPACT_DISABLE) {
	180	backing_store_stop_compaction = TRUE;
	181
	182	} else if (flags & SWAP_COMPACT_ENABLE) {
	183	backing_store_stop_compaction = FALSE;
	184	}
	185
	186	return 0;
	187	}
	188
	189	/*
	190	* Routine: macx_triggers
	191	* Function:
	192	* Syscall interface to set the call backs for low and
	193	* high water marks.
	194	*/
	195	int
	196	macx_triggers(
	197	struct macx_triggers_args *args)
	198	{
	199	int error;
	200
	201	error = suser(kauth_cred_get(), 0);
	202	if (error)
	203	return error;
	204
	205	return mach_macx_triggers(args);
	206	}
	207
1c79356b A	208	/*
	209	* Routine: macx_swapon
	210	* Function:
	211	* Syscall interface to add a file to backing store
	212	*/
	213	int
	214	macx_swapon(
91447636	215	struct macx_swapon_args *args)
1c79356b	216	{
91447636 A	217	int size = args->size;
91447636 A	218	vnode_t vp = (vnode_t)NULL;
1c79356b	219	struct nameidata nd, *ndp;
1c79356b A	220	register int error;
	221	kern_return_t kr;
	222	mach_port_t backing_store;
0b4e3aa0	223	memory_object_default_t default_pager;
1c79356b A	224	int i;
1c79356b A	225	boolean_t funnel_state;
91447636	226	off_t file_size;
2d21ac55 A	227	vfs_context_t ctx = vfs_context_current();
2d21ac55 A	228	struct proc *p = current_proc();
1c79356b	229
e5568f75	230	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON);
b0d623f7	231	AUDIT_ARG(value32, args->priority);
e5568f75	232
1c79356b A	233	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	234	ndp = &nd;
	235
91447636	236	if ((error = suser(kauth_cred_get(), 0)))
1c79356b A	237	goto swapon_bailout;
1c79356b A	238
1c79356b A	239	if(default_pager_init_flag == 0) {
	240	start_def_pager(NULL);
	241	default_pager_init_flag = 1;
	242	}
	243
	244	/*
	245	* Get a vnode for the paging area.
	246	*/
91447636 A	247	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF \| AUDITVNPATH1,
91447636 A	248	((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
b0d623f7	249	(user_addr_t) args->filename, ctx);
1c79356b A	250
	251	if ((error = namei(ndp)))
	252	goto swapon_bailout;
91447636	253	nameidone(ndp);
1c79356b A	254	vp = ndp->ni_vp;
	255
	256	if (vp->v_type != VREG) {
	257	error = EINVAL;
1c79356b A	258	goto swapon_bailout;
1c79356b A	259	}
1c79356b	260
91447636	261	/* get file size */
2d21ac55 A	262	if ((error = vnode_size(vp, &file_size, ctx)) != 0)
	263	goto swapon_bailout;
	264	#if CONFIG_MACF
	265	vnode_lock(vp);
	266	error = mac_system_check_swapon(vfs_context_ucred(ctx), vp);
	267	vnode_unlock(vp);
	268	if (error)
1c79356b	269	goto swapon_bailout;
2d21ac55	270	#endif
1c79356b	271
91447636	272	/* resize to desired size if it's too small */
2d21ac55	273	if ((file_size < (off_t)size) && ((error = vnode_setsize(vp, (off_t)size, 0, ctx)) != 0))
91447636	274	goto swapon_bailout;
1c79356b A	275
	276	/* add new backing store to list */
	277	i = 0;
	278	while(bs_port_table[i].vp != 0) {
	279	if(i == MAX_BACKING_STORE)
	280	break;
	281	i++;
	282	}
	283	if(i == MAX_BACKING_STORE) {
	284	error = ENOMEM;
1c79356b A	285	goto swapon_bailout;
	286	}
	287
	288	/* remember the vnode. This vnode has namei() reference */
	289	bs_port_table[i].vp = vp;
	290
	291	/*
	292	* Look to see if we are already paging to this file.
	293	*/
	294	/* make certain the copy send of kernel call will work */
0b4e3aa0 A	295	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
0b4e3aa0 A	296	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
1c79356b A	297	if(kr != KERN_SUCCESS) {
1c79356b A	298	error = EAGAIN;
1c79356b A	299	bs_port_table[i].vp = 0;
	300	goto swapon_bailout;
	301	}
	302
0b4e3aa0	303	kr = default_pager_backing_store_create(default_pager,
1c79356b A	304	-1, /* default priority */
	305	0, /* default cluster size */
	306	&backing_store);
0b4e3aa0 A	307	memory_object_default_deallocate(default_pager);
0b4e3aa0 A	308
1c79356b A	309	if(kr != KERN_SUCCESS) {
1c79356b A	310	error = ENOMEM;
1c79356b A	311	bs_port_table[i].vp = 0;
	312	goto swapon_bailout;
	313	}
	314
b0d623f7 A	315	/* Mark this vnode as being used for swapfile */
	316	vnode_lock_spin(vp);
	317	SET(vp->v_flag, VSWAP);
	318	vnode_unlock(vp);
	319
1c79356b A	320	/*
	321	* NOTE: we are able to supply PAGE_SIZE here instead of
	322	* an actual record size or block number because:
	323	* a: we do not support offsets from the beginning of the
	324	* file (allowing for non page size/record modulo offsets.
	325	* b: because allow paging will be done modulo page size
	326	*/
	327
91447636 A	328	kr = default_pager_add_file(backing_store, (vnode_ptr_t) vp,
91447636 A	329	PAGE_SIZE, (int)(file_size/PAGE_SIZE));
1c79356b A	330	if(kr != KERN_SUCCESS) {
	331	bs_port_table[i].vp = 0;
	332	if(kr == KERN_INVALID_ARGUMENT)
	333	error = EINVAL;
	334	else
	335	error = ENOMEM;
b0d623f7 A	336
	337	/* This vnode is not to be used for swapfile */
	338	vnode_lock_spin(vp);
	339	CLR(vp->v_flag, VSWAP);
	340	vnode_unlock(vp);
	341
1c79356b A	342	goto swapon_bailout;
	343	}
	344	bs_port_table[i].bs = (void *)backing_store;
	345	error = 0;
1c79356b	346
13fec989	347	ubc_setthreadcred(vp, p, current_thread());
55e303ae	348
1c79356b	349	/*
91447636	350	* take a long term reference on the vnode to keep
1c79356b A	351	* vnreclaim() away from this vnode.
1c79356b A	352	*/
91447636	353	vnode_ref(vp);
1c79356b A	354
	355	swapon_bailout:
	356	if (vp) {
91447636	357	vnode_put(vp);
1c79356b	358	}
1c79356b	359	(void) thread_funnel_set(kernel_flock, FALSE);
e5568f75	360	AUDIT_MACH_SYSCALL_EXIT(error);
1c79356b A	361	return(error);
	362	}
	363
	364	/*
	365	* Routine: macx_swapoff
	366	* Function:
	367	* Syscall interface to remove a file from backing store
	368	*/
	369	int
	370	macx_swapoff(
91447636	371	struct macx_swapoff_args *args)
1c79356b	372	{
91447636	373	__unused int flags = args->flags;
1c79356b A	374	kern_return_t kr;
	375	mach_port_t backing_store;
	376
	377	struct vnode *vp = 0;
	378	struct nameidata nd, *ndp;
	379	struct proc *p = current_proc();
	380	int i;
	381	int error;
	382	boolean_t funnel_state;
2d21ac55	383	vfs_context_t ctx = vfs_context_current();
1c79356b	384
e5568f75	385	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPOFF);
91447636	386
1c79356b A	387	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	388	backing_store = NULL;
	389	ndp = &nd;
	390
91447636	391	if ((error = suser(kauth_cred_get(), 0)))
1c79356b A	392	goto swapoff_bailout;
1c79356b A	393
1c79356b A	394	/*
	395	* Get the vnode for the paging area.
	396	*/
91447636 A	397	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF \| AUDITVNPATH1,
91447636 A	398	((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
b0d623f7	399	(user_addr_t) args->filename, ctx);
1c79356b A	400
	401	if ((error = namei(ndp)))
	402	goto swapoff_bailout;
91447636	403	nameidone(ndp);
1c79356b A	404	vp = ndp->ni_vp;
	405
	406	if (vp->v_type != VREG) {
	407	error = EINVAL;
1c79356b A	408	goto swapoff_bailout;
1c79356b A	409	}
2d21ac55 A	410	#if CONFIG_MACF
	411	vnode_lock(vp);
	412	error = mac_system_check_swapoff(vfs_context_ucred(ctx), vp);
	413	vnode_unlock(vp);
	414	if (error)
	415	goto swapoff_bailout;
	416	#endif
1c79356b A	417
	418	for(i = 0; i < MAX_BACKING_STORE; i++) {
	419	if(bs_port_table[i].vp == vp) {
1c79356b A	420	break;
	421	}
	422	}
	423	if (i == MAX_BACKING_STORE) {
	424	error = EINVAL;
1c79356b A	425	goto swapoff_bailout;
	426	}
	427	backing_store = (mach_port_t)bs_port_table[i].bs;
	428
1c79356b A	429	kr = default_pager_backing_store_delete(backing_store);
	430	switch (kr) {
	431	case KERN_SUCCESS:
	432	error = 0;
	433	bs_port_table[i].vp = 0;
1c79356b	434	/* This vnode is no longer used for swapfile */
b0d623f7	435	vnode_lock_spin(vp);
1c79356b	436	CLR(vp->v_flag, VSWAP);
b0d623f7	437	vnode_unlock(vp);
1c79356b	438
91447636 A	439	/* get rid of macx_swapon() "long term" reference */
91447636 A	440	vnode_rele(vp);
1c79356b	441
1c79356b A	442	break;
	443	case KERN_FAILURE:
	444	error = EAGAIN;
	445	break;
	446	default:
	447	error = EAGAIN;
	448	break;
	449	}
	450
	451	swapoff_bailout:
	452	/* get rid of macx_swapoff() namei() reference */
	453	if (vp)
91447636	454	vnode_put(vp);
1c79356b	455
1c79356b	456	(void) thread_funnel_set(kernel_flock, FALSE);
e5568f75	457	AUDIT_MACH_SYSCALL_EXIT(error);
1c79356b A	458	return(error);
1c79356b A	459	}
91447636 A	460
	461	/*
	462	* Routine: macx_swapinfo
	463	* Function:
	464	* Syscall interface to get general swap statistics
	465	*/
	466	int
	467	macx_swapinfo(
	468	memory_object_size_t *total_p,
	469	memory_object_size_t *avail_p,
	470	vm_size_t *pagesize_p,
	471	boolean_t *encrypted_p)
	472	{
	473	int error;
	474	memory_object_default_t default_pager;
	475	default_pager_info_64_t dpi64;
	476	kern_return_t kr;
	477
	478	error = 0;
	479
	480	/*
	481	* Get a handle on the default pager.
	482	*/
	483	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
	484	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
	485	if (kr != KERN_SUCCESS) {
	486	error = EAGAIN; /* XXX why EAGAIN ? */
	487	goto done;
	488	}
	489	if (default_pager == MEMORY_OBJECT_DEFAULT_NULL) {
	490	/*
	491	* The default pager has not initialized yet,
	492	* so it can't be using any swap space at all.
	493	*/
	494	*total_p = 0;
	495	*avail_p = 0;
	496	*pagesize_p = 0;
	497	*encrypted_p = FALSE;
	498	goto done;
	499	}
	500
	501	/*
	502	* Get swap usage data from default pager.
	503	*/
	504	kr = default_pager_info_64(default_pager, &dpi64);
	505	if (kr != KERN_SUCCESS) {
	506	error = ENOTSUP;
	507	goto done;
	508	}
	509
	510	/*
	511	* Provide default pager info to caller.
	512	*/
	513	*total_p = dpi64.dpi_total_space;
	514	*avail_p = dpi64.dpi_free_space;
	515	*pagesize_p = dpi64.dpi_page_size;
	516	if (dpi64.dpi_flags & DPI_ENCRYPTED) {
	517	*encrypted_p = TRUE;
	518	} else {
	519	*encrypted_p = FALSE;
	520	}
	521
	522	done:
	523	if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) {
524	/* release our handle on default pager */
525	memory_object_default_deallocate(default_pager);
526	}
527	return error;
528	}