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

/*
 * Copyright (c) 2000-2004 Apple Computer, 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@
 */

#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 <bsm/audit_kernel.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>

extern thread_t current_act(void);

/*
 * 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);
}

/*
 *	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;
	struct proc		*p =  current_proc();
	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;
	struct vfs_context	context;

	context.vc_proc = p;
	context.vc_ucred = kauth_cred_get();

	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON);
	AUDIT_ARG(value, 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),
	       CAST_USER_ADDR_T(args->filename), &context);

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

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

	/* get file size */
	if ((error = vnode_size(vp, &file_size, &context)) != 0)
		goto swapon_bailout;

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

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

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

	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;
	struct vfs_context context;

	context.vc_proc = p;
	context.vc_ucred = kauth_cred_get();

	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),
	       CAST_USER_ADDR_T(args->filename), &context);

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

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

	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 */
			CLR(vp->v_flag, VSWAP);

			/* 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	/*
5d5c5d0d A	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 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.
	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
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
1c79356b A	28
1c79356b A	29	#include <sys/param.h>
	30	#include <sys/systm.h>
	31	#include <sys/lock.h>
91447636 A	32	#include <sys/proc_internal.h>
91447636 A	33	#include <sys/kauth.h>
1c79356b A	34	#include <sys/buf.h>
1c79356b A	35	#include <sys/uio.h>
91447636	36	#include <sys/vnode_internal.h>
1c79356b	37	#include <sys/namei.h>
91447636 A	38	#include <sys/ubc_internal.h>
	39	#include <sys/malloc.h>
	40
	41	#include <default_pager/default_pager_types.h>
	42	#include <default_pager/default_pager_object.h>
1c79356b	43
e5568f75 A	44	#include <bsm/audit_kernel.h>
	45	#include <bsm/audit_kevents.h>
	46
1c79356b	47	#include <mach/mach_types.h>
91447636 A	48	#include <mach/host_priv.h>
	49	#include <mach/mach_traps.h>
	50	#include <mach/boolean.h>
	51
	52	#include <kern/kern_types.h>
1c79356b	53	#include <kern/host.h>
91447636	54	#include <kern/task.h>
1c79356b A	55	#include <kern/zalloc.h>
1c79356b A	56	#include <kern/kalloc.h>
91447636 A	57	#include <kern/assert.h>
91447636 A	58
1c79356b	59	#include <libkern/libkern.h>
1c79356b	60
91447636 A	61	#include <vm/vm_pageout.h>
	62	#include <vm/vm_map.h>
	63	#include <vm/vm_kern.h>
1c79356b	64	#include <vm/vnode_pager.h>
91447636 A	65	#include <vm/vm_protos.h>
	66
	67	extern thread_t current_act(void);
1c79356b A	68
	69	/*
	70	* temporary support for delayed instantiation
	71	* of default_pager
	72	*/
	73	int default_pager_init_flag = 0;
	74
	75	struct bs_map bs_port_table[MAX_BACKING_STORE] = {
	76	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	77	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	78	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	79	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	80	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	81	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	82	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	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
	87	/* ###################################################### */
	88
	89
55e303ae A	90	/*
	91	* Routine: macx_backing_store_recovery
	92	* Function:
	93	* Syscall interface to set a tasks privilege
	94	* level so that it is not subject to
	95	* macx_backing_store_suspend
	96	*/
	97	int
	98	macx_backing_store_recovery(
91447636	99	struct macx_backing_store_recovery_args *args)
55e303ae	100	{
91447636	101	int pid = args->pid;
55e303ae A	102	int error;
	103	struct proc *p = current_proc();
	104	boolean_t funnel_state;
	105
	106	funnel_state = thread_funnel_set(kernel_flock, TRUE);
91447636	107	if ((error = suser(kauth_cred_get(), 0)))
55e303ae A	108	goto backing_store_recovery_return;
	109
	110	/* for now restrict backing_store_recovery */
	111	/* usage to only present task */
91447636	112	if(pid != proc_selfpid()) {
55e303ae A	113	error = EINVAL;
	114	goto backing_store_recovery_return;
	115	}
	116
	117	task_backing_store_privileged(p->task);
	118
	119	backing_store_recovery_return:
	120	(void) thread_funnel_set(kernel_flock, FALSE);
	121	return(error);
	122	}
	123
	124	/*
	125	* Routine: macx_backing_store_suspend
	126	* Function:
	127	* Syscall interface to stop new demand for
	128	* backing store when backing store is low
	129	*/
	130
	131	int
	132	macx_backing_store_suspend(
91447636	133	struct macx_backing_store_suspend_args *args)
55e303ae	134	{
91447636	135	boolean_t suspend = args->suspend;
55e303ae	136	int error;
55e303ae A	137	boolean_t funnel_state;
	138
	139	funnel_state = thread_funnel_set(kernel_flock, TRUE);
91447636	140	if ((error = suser(kauth_cred_get(), 0)))
55e303ae A	141	goto backing_store_suspend_return;
	142
	143	vm_backing_store_disable(suspend);
	144
	145	backing_store_suspend_return:
	146	(void) thread_funnel_set(kernel_flock, FALSE);
	147	return(error);
	148	}
	149
1c79356b A	150	/*
	151	* Routine: macx_swapon
	152	* Function:
	153	* Syscall interface to add a file to backing store
	154	*/
	155	int
	156	macx_swapon(
91447636	157	struct macx_swapon_args *args)
1c79356b	158	{
91447636 A	159	int size = args->size;
91447636 A	160	vnode_t vp = (vnode_t)NULL;
1c79356b A	161	struct nameidata nd, *ndp;
1c79356b A	162	struct proc *p = current_proc();
1c79356b A	163	register int error;
	164	kern_return_t kr;
	165	mach_port_t backing_store;
0b4e3aa0	166	memory_object_default_t default_pager;
1c79356b A	167	int i;
1c79356b A	168	boolean_t funnel_state;
91447636 A	169	off_t file_size;
91447636 A	170	struct vfs_context context;
1c79356b	171
91447636 A	172	context.vc_proc = p;
91447636 A	173	context.vc_ucred = kauth_cred_get();
1c79356b	174
e5568f75	175	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON);
91447636	176	AUDIT_ARG(value, args->priority);
e5568f75	177
1c79356b A	178	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	179	ndp = &nd;
	180
91447636	181	if ((error = suser(kauth_cred_get(), 0)))
1c79356b A	182	goto swapon_bailout;
1c79356b A	183
1c79356b A	184	if(default_pager_init_flag == 0) {
	185	start_def_pager(NULL);
	186	default_pager_init_flag = 1;
	187	}
	188
	189	/*
	190	* Get a vnode for the paging area.
	191	*/
91447636 A	192	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF \| AUDITVNPATH1,
	193	((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
	194	CAST_USER_ADDR_T(args->filename), &context);
1c79356b A	195
	196	if ((error = namei(ndp)))
	197	goto swapon_bailout;
91447636	198	nameidone(ndp);
1c79356b A	199	vp = ndp->ni_vp;
	200
	201	if (vp->v_type != VREG) {
	202	error = EINVAL;
1c79356b A	203	goto swapon_bailout;
	204	}
	205	UBCINFOCHECK("macx_swapon", vp);
	206
91447636 A	207	/* get file size */
91447636 A	208	if ((error = vnode_size(vp, &file_size, &context)) != 0)
1c79356b	209	goto swapon_bailout;
1c79356b	210
91447636 A	211	/* resize to desired size if it's too small */
	212	if ((file_size < (off_t)size) && ((error = vnode_setsize(vp, (off_t)size, 0, &context)) != 0))
	213	goto swapon_bailout;
1c79356b A	214
	215	/* add new backing store to list */
	216	i = 0;
	217	while(bs_port_table[i].vp != 0) {
	218	if(i == MAX_BACKING_STORE)
	219	break;
	220	i++;
	221	}
	222	if(i == MAX_BACKING_STORE) {
	223	error = ENOMEM;
1c79356b A	224	goto swapon_bailout;
	225	}
	226
	227	/* remember the vnode. This vnode has namei() reference */
	228	bs_port_table[i].vp = vp;
	229
	230	/*
	231	* Look to see if we are already paging to this file.
	232	*/
	233	/* make certain the copy send of kernel call will work */
0b4e3aa0 A	234	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
0b4e3aa0 A	235	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
1c79356b A	236	if(kr != KERN_SUCCESS) {
1c79356b A	237	error = EAGAIN;
1c79356b A	238	bs_port_table[i].vp = 0;
	239	goto swapon_bailout;
	240	}
	241
0b4e3aa0	242	kr = default_pager_backing_store_create(default_pager,
1c79356b A	243	-1, /* default priority */
	244	0, /* default cluster size */
	245	&backing_store);
0b4e3aa0 A	246	memory_object_default_deallocate(default_pager);
0b4e3aa0 A	247
1c79356b A	248	if(kr != KERN_SUCCESS) {
1c79356b A	249	error = ENOMEM;
1c79356b A	250	bs_port_table[i].vp = 0;
	251	goto swapon_bailout;
	252	}
	253
	254	/*
	255	* NOTE: we are able to supply PAGE_SIZE here instead of
	256	* an actual record size or block number because:
	257	* a: we do not support offsets from the beginning of the
	258	* file (allowing for non page size/record modulo offsets.
	259	* b: because allow paging will be done modulo page size
	260	*/
	261
91447636 A	262	kr = default_pager_add_file(backing_store, (vnode_ptr_t) vp,
91447636 A	263	PAGE_SIZE, (int)(file_size/PAGE_SIZE));
1c79356b A	264	if(kr != KERN_SUCCESS) {
	265	bs_port_table[i].vp = 0;
	266	if(kr == KERN_INVALID_ARGUMENT)
	267	error = EINVAL;
	268	else
	269	error = ENOMEM;
	270	goto swapon_bailout;
	271	}
	272	bs_port_table[i].bs = (void *)backing_store;
	273	error = 0;
1c79356b A	274
	275	/* Mark this vnode as being used for swapfile */
	276	SET(vp->v_flag, VSWAP);
	277
13fec989	278	ubc_setthreadcred(vp, p, current_thread());
55e303ae	279
1c79356b	280	/*
91447636	281	* take a long term reference on the vnode to keep
1c79356b A	282	* vnreclaim() away from this vnode.
1c79356b A	283	*/
91447636	284	vnode_ref(vp);
1c79356b A	285
	286	swapon_bailout:
	287	if (vp) {
91447636	288	vnode_put(vp);
1c79356b	289	}
1c79356b	290	(void) thread_funnel_set(kernel_flock, FALSE);
e5568f75	291	AUDIT_MACH_SYSCALL_EXIT(error);
1c79356b A	292	return(error);
	293	}
	294
	295	/*
	296	* Routine: macx_swapoff
	297	* Function:
	298	* Syscall interface to remove a file from backing store
	299	*/
	300	int
	301	macx_swapoff(
91447636	302	struct macx_swapoff_args *args)
1c79356b	303	{
91447636	304	__unused int flags = args->flags;
1c79356b A	305	kern_return_t kr;
	306	mach_port_t backing_store;
	307
	308	struct vnode *vp = 0;
	309	struct nameidata nd, *ndp;
	310	struct proc *p = current_proc();
	311	int i;
	312	int error;
	313	boolean_t funnel_state;
91447636 A	314	struct vfs_context context;
	315
	316	context.vc_proc = p;
	317	context.vc_ucred = kauth_cred_get();
1c79356b	318
e5568f75	319	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPOFF);
91447636	320
1c79356b A	321	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	322	backing_store = NULL;
	323	ndp = &nd;
	324
91447636	325	if ((error = suser(kauth_cred_get(), 0)))
1c79356b A	326	goto swapoff_bailout;
1c79356b A	327
1c79356b A	328	/*
	329	* Get the vnode for the paging area.
	330	*/
91447636 A	331	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF \| AUDITVNPATH1,
	332	((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
	333	CAST_USER_ADDR_T(args->filename), &context);
1c79356b A	334
	335	if ((error = namei(ndp)))
	336	goto swapoff_bailout;
91447636	337	nameidone(ndp);
1c79356b A	338	vp = ndp->ni_vp;
	339
	340	if (vp->v_type != VREG) {
	341	error = EINVAL;
1c79356b A	342	goto swapoff_bailout;
	343	}
	344
	345	for(i = 0; i < MAX_BACKING_STORE; i++) {
	346	if(bs_port_table[i].vp == vp) {
1c79356b A	347	break;
	348	}
	349	}
	350	if (i == MAX_BACKING_STORE) {
	351	error = EINVAL;
1c79356b A	352	goto swapoff_bailout;
	353	}
	354	backing_store = (mach_port_t)bs_port_table[i].bs;
	355
1c79356b A	356	kr = default_pager_backing_store_delete(backing_store);
	357	switch (kr) {
	358	case KERN_SUCCESS:
	359	error = 0;
	360	bs_port_table[i].vp = 0;
1c79356b A	361	/* This vnode is no longer used for swapfile */
	362	CLR(vp->v_flag, VSWAP);
	363
91447636 A	364	/* get rid of macx_swapon() "long term" reference */
91447636 A	365	vnode_rele(vp);
1c79356b	366
1c79356b A	367	break;
	368	case KERN_FAILURE:
	369	error = EAGAIN;
	370	break;
	371	default:
	372	error = EAGAIN;
	373	break;
	374	}
	375
	376	swapoff_bailout:
	377	/* get rid of macx_swapoff() namei() reference */
	378	if (vp)
91447636	379	vnode_put(vp);
1c79356b	380
1c79356b	381	(void) thread_funnel_set(kernel_flock, FALSE);
e5568f75	382	AUDIT_MACH_SYSCALL_EXIT(error);
1c79356b A	383	return(error);
1c79356b A	384	}
91447636 A	385
	386	/*
	387	* Routine: macx_swapinfo
	388	* Function:
	389	* Syscall interface to get general swap statistics
	390	*/
	391	int
	392	macx_swapinfo(
	393	memory_object_size_t *total_p,
	394	memory_object_size_t *avail_p,
	395	vm_size_t *pagesize_p,
	396	boolean_t *encrypted_p)
	397	{
	398	int error;
	399	memory_object_default_t default_pager;
	400	default_pager_info_64_t dpi64;
	401	kern_return_t kr;
	402
	403	error = 0;
	404
	405	/*
	406	* Get a handle on the default pager.
	407	*/
	408	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
	409	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
	410	if (kr != KERN_SUCCESS) {
	411	error = EAGAIN; /* XXX why EAGAIN ? */
	412	goto done;
	413	}
	414	if (default_pager == MEMORY_OBJECT_DEFAULT_NULL) {
	415	/*
	416	* The default pager has not initialized yet,
	417	* so it can't be using any swap space at all.
	418	*/
	419	*total_p = 0;
	420	*avail_p = 0;
	421	*pagesize_p = 0;
	422	*encrypted_p = FALSE;
	423	goto done;
	424	}
	425
	426	/*
	427	* Get swap usage data from default pager.
	428	*/
	429	kr = default_pager_info_64(default_pager, &dpi64);
	430	if (kr != KERN_SUCCESS) {
	431	error = ENOTSUP;
	432	goto done;
	433	}
	434
	435	/*
	436	* Provide default pager info to caller.
	437	*/
	438	*total_p = dpi64.dpi_total_space;
	439	*avail_p = dpi64.dpi_free_space;
	440	*pagesize_p = dpi64.dpi_page_size;
	441	if (dpi64.dpi_flags & DPI_ENCRYPTED) {
	442	*encrypted_p = TRUE;
	443	} else {
	444	*encrypted_p = FALSE;
	445	}
	446
	447	done:
	448	if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) {
449	/* release our handle on default pager */
450	memory_object_default_deallocate(default_pager);
451	}
452	return error;
453	}