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

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_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 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.
 * 
 * @APPLE_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_setcred(vp, p);

	/*
	 * 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	/*
e5568f75	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
e5568f75 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
e5568f75 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22
1c79356b A	23	#include <sys/param.h>
	24	#include <sys/systm.h>
	25	#include <sys/lock.h>
91447636 A	26	#include <sys/proc_internal.h>
91447636 A	27	#include <sys/kauth.h>
1c79356b A	28	#include <sys/buf.h>
1c79356b A	29	#include <sys/uio.h>
91447636	30	#include <sys/vnode_internal.h>
1c79356b	31	#include <sys/namei.h>
91447636 A	32	#include <sys/ubc_internal.h>
	33	#include <sys/malloc.h>
	34
	35	#include <default_pager/default_pager_types.h>
	36	#include <default_pager/default_pager_object.h>
1c79356b	37
e5568f75 A	38	#include <bsm/audit_kernel.h>
	39	#include <bsm/audit_kevents.h>
	40
1c79356b	41	#include <mach/mach_types.h>
91447636 A	42	#include <mach/host_priv.h>
	43	#include <mach/mach_traps.h>
	44	#include <mach/boolean.h>
	45
	46	#include <kern/kern_types.h>
1c79356b	47	#include <kern/host.h>
91447636	48	#include <kern/task.h>
1c79356b A	49	#include <kern/zalloc.h>
1c79356b A	50	#include <kern/kalloc.h>
91447636 A	51	#include <kern/assert.h>
91447636 A	52
1c79356b	53	#include <libkern/libkern.h>
1c79356b	54
91447636 A	55	#include <vm/vm_pageout.h>
	56	#include <vm/vm_map.h>
	57	#include <vm/vm_kern.h>
1c79356b	58	#include <vm/vnode_pager.h>
91447636 A	59	#include <vm/vm_protos.h>
	60
	61	extern thread_t current_act(void);
1c79356b A	62
	63	/*
	64	* temporary support for delayed instantiation
	65	* of default_pager
	66	*/
	67	int default_pager_init_flag = 0;
	68
	69	struct bs_map bs_port_table[MAX_BACKING_STORE] = {
	70	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	71	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	72	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	73	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	74	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	75	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	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
	81	/* ###################################################### */
	82
	83
55e303ae A	84	/*
	85	* Routine: macx_backing_store_recovery
	86	* Function:
	87	* Syscall interface to set a tasks privilege
	88	* level so that it is not subject to
	89	* macx_backing_store_suspend
	90	*/
	91	int
	92	macx_backing_store_recovery(
91447636	93	struct macx_backing_store_recovery_args *args)
55e303ae	94	{
91447636	95	int pid = args->pid;
55e303ae A	96	int error;
	97	struct proc *p = current_proc();
	98	boolean_t funnel_state;
	99
	100	funnel_state = thread_funnel_set(kernel_flock, TRUE);
91447636	101	if ((error = suser(kauth_cred_get(), 0)))
55e303ae A	102	goto backing_store_recovery_return;
	103
	104	/* for now restrict backing_store_recovery */
	105	/* usage to only present task */
91447636	106	if(pid != proc_selfpid()) {
55e303ae A	107	error = EINVAL;
	108	goto backing_store_recovery_return;
	109	}
	110
	111	task_backing_store_privileged(p->task);
	112
	113	backing_store_recovery_return:
	114	(void) thread_funnel_set(kernel_flock, FALSE);
	115	return(error);
	116	}
	117
	118	/*
	119	* Routine: macx_backing_store_suspend
	120	* Function:
	121	* Syscall interface to stop new demand for
	122	* backing store when backing store is low
	123	*/
	124
	125	int
	126	macx_backing_store_suspend(
91447636	127	struct macx_backing_store_suspend_args *args)
55e303ae	128	{
91447636	129	boolean_t suspend = args->suspend;
55e303ae	130	int error;
55e303ae A	131	boolean_t funnel_state;
	132
	133	funnel_state = thread_funnel_set(kernel_flock, TRUE);
91447636	134	if ((error = suser(kauth_cred_get(), 0)))
55e303ae A	135	goto backing_store_suspend_return;
	136
	137	vm_backing_store_disable(suspend);
	138
	139	backing_store_suspend_return:
	140	(void) thread_funnel_set(kernel_flock, FALSE);
	141	return(error);
	142	}
	143
1c79356b A	144	/*
	145	* Routine: macx_swapon
	146	* Function:
	147	* Syscall interface to add a file to backing store
	148	*/
	149	int
	150	macx_swapon(
91447636	151	struct macx_swapon_args *args)
1c79356b	152	{
91447636 A	153	int size = args->size;
91447636 A	154	vnode_t vp = (vnode_t)NULL;
1c79356b A	155	struct nameidata nd, *ndp;
1c79356b A	156	struct proc *p = current_proc();
1c79356b A	157	register int error;
	158	kern_return_t kr;
	159	mach_port_t backing_store;
0b4e3aa0	160	memory_object_default_t default_pager;
1c79356b A	161	int i;
1c79356b A	162	boolean_t funnel_state;
91447636 A	163	off_t file_size;
91447636 A	164	struct vfs_context context;
1c79356b	165
91447636 A	166	context.vc_proc = p;
91447636 A	167	context.vc_ucred = kauth_cred_get();
1c79356b	168
e5568f75	169	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON);
91447636	170	AUDIT_ARG(value, args->priority);
e5568f75	171
1c79356b A	172	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	173	ndp = &nd;
	174
91447636	175	if ((error = suser(kauth_cred_get(), 0)))
1c79356b A	176	goto swapon_bailout;
1c79356b A	177
1c79356b A	178	if(default_pager_init_flag == 0) {
	179	start_def_pager(NULL);
	180	default_pager_init_flag = 1;
	181	}
	182
	183	/*
	184	* Get a vnode for the paging area.
	185	*/
91447636 A	186	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF \| AUDITVNPATH1,
	187	((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
	188	CAST_USER_ADDR_T(args->filename), &context);
1c79356b A	189
	190	if ((error = namei(ndp)))
	191	goto swapon_bailout;
91447636	192	nameidone(ndp);
1c79356b A	193	vp = ndp->ni_vp;
	194
	195	if (vp->v_type != VREG) {
	196	error = EINVAL;
1c79356b A	197	goto swapon_bailout;
	198	}
	199	UBCINFOCHECK("macx_swapon", vp);
	200
91447636 A	201	/* get file size */
91447636 A	202	if ((error = vnode_size(vp, &file_size, &context)) != 0)
1c79356b	203	goto swapon_bailout;
1c79356b	204
91447636 A	205	/* resize to desired size if it's too small */
	206	if ((file_size < (off_t)size) && ((error = vnode_setsize(vp, (off_t)size, 0, &context)) != 0))
	207	goto swapon_bailout;
1c79356b A	208
	209	/* add new backing store to list */
	210	i = 0;
	211	while(bs_port_table[i].vp != 0) {
	212	if(i == MAX_BACKING_STORE)
	213	break;
	214	i++;
	215	}
	216	if(i == MAX_BACKING_STORE) {
	217	error = ENOMEM;
1c79356b A	218	goto swapon_bailout;
	219	}
	220
	221	/* remember the vnode. This vnode has namei() reference */
	222	bs_port_table[i].vp = vp;
	223
	224	/*
	225	* Look to see if we are already paging to this file.
	226	*/
	227	/* make certain the copy send of kernel call will work */
0b4e3aa0 A	228	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
0b4e3aa0 A	229	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
1c79356b A	230	if(kr != KERN_SUCCESS) {
1c79356b A	231	error = EAGAIN;
1c79356b A	232	bs_port_table[i].vp = 0;
	233	goto swapon_bailout;
	234	}
	235
0b4e3aa0	236	kr = default_pager_backing_store_create(default_pager,
1c79356b A	237	-1, /* default priority */
	238	0, /* default cluster size */
	239	&backing_store);
0b4e3aa0 A	240	memory_object_default_deallocate(default_pager);
0b4e3aa0 A	241
1c79356b A	242	if(kr != KERN_SUCCESS) {
1c79356b A	243	error = ENOMEM;
1c79356b A	244	bs_port_table[i].vp = 0;
	245	goto swapon_bailout;
	246	}
	247
	248	/*
	249	* NOTE: we are able to supply PAGE_SIZE here instead of
	250	* an actual record size or block number because:
	251	* a: we do not support offsets from the beginning of the
	252	* file (allowing for non page size/record modulo offsets.
	253	* b: because allow paging will be done modulo page size
	254	*/
	255
91447636 A	256	kr = default_pager_add_file(backing_store, (vnode_ptr_t) vp,
91447636 A	257	PAGE_SIZE, (int)(file_size/PAGE_SIZE));
1c79356b A	258	if(kr != KERN_SUCCESS) {
	259	bs_port_table[i].vp = 0;
	260	if(kr == KERN_INVALID_ARGUMENT)
	261	error = EINVAL;
	262	else
	263	error = ENOMEM;
	264	goto swapon_bailout;
	265	}
	266	bs_port_table[i].bs = (void *)backing_store;
	267	error = 0;
1c79356b A	268
	269	/* Mark this vnode as being used for swapfile */
	270	SET(vp->v_flag, VSWAP);
	271
55e303ae A	272	ubc_setcred(vp, p);
55e303ae A	273
1c79356b	274	/*
91447636	275	* take a long term reference on the vnode to keep
1c79356b A	276	* vnreclaim() away from this vnode.
1c79356b A	277	*/
91447636	278	vnode_ref(vp);
1c79356b A	279
	280	swapon_bailout:
	281	if (vp) {
91447636	282	vnode_put(vp);
1c79356b	283	}
1c79356b	284	(void) thread_funnel_set(kernel_flock, FALSE);
e5568f75	285	AUDIT_MACH_SYSCALL_EXIT(error);
1c79356b A	286	return(error);
	287	}
	288
	289	/*
	290	* Routine: macx_swapoff
	291	* Function:
	292	* Syscall interface to remove a file from backing store
	293	*/
	294	int
	295	macx_swapoff(
91447636	296	struct macx_swapoff_args *args)
1c79356b	297	{
91447636	298	__unused int flags = args->flags;
1c79356b A	299	kern_return_t kr;
	300	mach_port_t backing_store;
	301
	302	struct vnode *vp = 0;
	303	struct nameidata nd, *ndp;
	304	struct proc *p = current_proc();
	305	int i;
	306	int error;
	307	boolean_t funnel_state;
91447636 A	308	struct vfs_context context;
	309
	310	context.vc_proc = p;
	311	context.vc_ucred = kauth_cred_get();
1c79356b	312
e5568f75	313	AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPOFF);
91447636	314
1c79356b A	315	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	316	backing_store = NULL;
	317	ndp = &nd;
	318
91447636	319	if ((error = suser(kauth_cred_get(), 0)))
1c79356b A	320	goto swapoff_bailout;
1c79356b A	321
1c79356b A	322	/*
	323	* Get the vnode for the paging area.
	324	*/
91447636 A	325	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF \| AUDITVNPATH1,
	326	((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32),
	327	CAST_USER_ADDR_T(args->filename), &context);
1c79356b A	328
	329	if ((error = namei(ndp)))
	330	goto swapoff_bailout;
91447636	331	nameidone(ndp);
1c79356b A	332	vp = ndp->ni_vp;
	333
	334	if (vp->v_type != VREG) {
	335	error = EINVAL;
1c79356b A	336	goto swapoff_bailout;
	337	}
	338
	339	for(i = 0; i < MAX_BACKING_STORE; i++) {
	340	if(bs_port_table[i].vp == vp) {
1c79356b A	341	break;
	342	}
	343	}
	344	if (i == MAX_BACKING_STORE) {
	345	error = EINVAL;
1c79356b A	346	goto swapoff_bailout;
	347	}
	348	backing_store = (mach_port_t)bs_port_table[i].bs;
	349
1c79356b A	350	kr = default_pager_backing_store_delete(backing_store);
	351	switch (kr) {
	352	case KERN_SUCCESS:
	353	error = 0;
	354	bs_port_table[i].vp = 0;
1c79356b A	355	/* This vnode is no longer used for swapfile */
	356	CLR(vp->v_flag, VSWAP);
	357
91447636 A	358	/* get rid of macx_swapon() "long term" reference */
91447636 A	359	vnode_rele(vp);
1c79356b	360
1c79356b A	361	break;
	362	case KERN_FAILURE:
	363	error = EAGAIN;
	364	break;
	365	default:
	366	error = EAGAIN;
	367	break;
	368	}
	369
	370	swapoff_bailout:
	371	/* get rid of macx_swapoff() namei() reference */
	372	if (vp)
91447636	373	vnode_put(vp);
1c79356b	374
1c79356b	375	(void) thread_funnel_set(kernel_flock, FALSE);
e5568f75	376	AUDIT_MACH_SYSCALL_EXIT(error);
1c79356b A	377	return(error);
1c79356b A	378	}
91447636 A	379
	380	/*
	381	* Routine: macx_swapinfo
	382	* Function:
	383	* Syscall interface to get general swap statistics
	384	*/
	385	int
	386	macx_swapinfo(
	387	memory_object_size_t *total_p,
	388	memory_object_size_t *avail_p,
	389	vm_size_t *pagesize_p,
	390	boolean_t *encrypted_p)
	391	{
	392	int error;
	393	memory_object_default_t default_pager;
	394	default_pager_info_64_t dpi64;
	395	kern_return_t kr;
	396
	397	error = 0;
	398
	399	/*
	400	* Get a handle on the default pager.
	401	*/
	402	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
	403	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
	404	if (kr != KERN_SUCCESS) {
	405	error = EAGAIN; /* XXX why EAGAIN ? */
	406	goto done;
	407	}
	408	if (default_pager == MEMORY_OBJECT_DEFAULT_NULL) {
	409	/*
	410	* The default pager has not initialized yet,
	411	* so it can't be using any swap space at all.
	412	*/
	413	*total_p = 0;
	414	*avail_p = 0;
	415	*pagesize_p = 0;
	416	*encrypted_p = FALSE;
	417	goto done;
	418	}
	419
	420	/*
	421	* Get swap usage data from default pager.
	422	*/
	423	kr = default_pager_info_64(default_pager, &dpi64);
	424	if (kr != KERN_SUCCESS) {
	425	error = ENOTSUP;
	426	goto done;
	427	}
	428
	429	/*
	430	* Provide default pager info to caller.
	431	*/
	432	*total_p = dpi64.dpi_total_space;
	433	*avail_p = dpi64.dpi_free_space;
	434	*pagesize_p = dpi64.dpi_page_size;
	435	if (dpi64.dpi_flags & DPI_ENCRYPTED) {
	436	*encrypted_p = TRUE;
	437	} else {
	438	*encrypted_p = FALSE;
	439	}
	440
	441	done:
	442	if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) {
443	/* release our handle on default pager */
444	memory_object_default_deallocate(default_pager);
445	}
446	return error;
447	}