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

/*
 * Copyright (c) 2000 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 <mach/boolean.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/ubc.h>

#include <mach/mach_types.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <kern/host.h>
#include <kern/zalloc.h>
#include <kern/kalloc.h>
#include <libkern/libkern.h>
#include <sys/malloc.h>

#include <vm/vnode_pager.h>

/*
 * 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}};

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


#include <kern/assert.h>

/*
 *	Routine:	macx_swapon
 *	Function:
 *		Syscall interface to add a file to backing store
 */
int
macx_swapon(
	char 	*filename,
	int	flags,
	long	size,
	long	priority)
{
	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;
	memory_object_default_t	default_pager;
	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;

	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, UIO_USERSPACE,
	    filename, p);

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

	if (vp->v_type != VREG) {
		error = EINVAL;
	        VOP_UNLOCK(vp, 0, p);
		goto swapon_bailout;
	}
	UBCINFOCHECK("macx_swapon", vp);

	if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) {
	        VOP_UNLOCK(vp, 0, p);
		goto swapon_bailout;
	}

	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;
		}
	}

	/* 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;
	}

	/* 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;
	   VOP_UNLOCK(vp, 0, p);
	   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;
	   VOP_UNLOCK(vp, 0, p);
	   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
	 */

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

/*
 *	Routine:	macx_swapoff
 *	Function:
 *		Syscall interface to remove a file from backing store
 */
int
macx_swapoff(
	char 	*filename,
	int	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;

	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;

	/*
	 * 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;
	}

	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;
	}

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

	(void) thread_funnel_set(kernel_flock, FALSE);
	return(error);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 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	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 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,
de355530 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
	23	#include <mach/boolean.h>
	24	#include <sys/param.h>
	25	#include <sys/systm.h>
	26	#include <sys/lock.h>
	27	#include <sys/proc.h>
	28	#include <sys/buf.h>
	29	#include <sys/uio.h>
	30	#include <sys/vnode.h>
	31	#include <sys/namei.h>
	32	#include <sys/ubc.h>
	33
	34	#include <mach/mach_types.h>
	35	#include <vm/vm_map.h>
	36	#include <vm/vm_kern.h>
	37	#include <kern/host.h>
1c79356b A	38	#include <kern/zalloc.h>
	39	#include <kern/kalloc.h>
	40	#include <libkern/libkern.h>
	41	#include <sys/malloc.h>
	42
	43	#include <vm/vnode_pager.h>
	44
	45	/*
	46	* temporary support for delayed instantiation
	47	* of default_pager
	48	*/
	49	int default_pager_init_flag = 0;
	50
	51	struct bs_map bs_port_table[MAX_BACKING_STORE] = {
	52	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	53	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	54	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	55	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	56	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	57	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	58	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	59	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	60	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
	61	{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}};
	62
	63	/* ###################################################### */
	64
	65
	66	#include <kern/assert.h>
	67
	68	/*
	69	* Routine: macx_swapon
	70	* Function:
	71	* Syscall interface to add a file to backing store
	72	*/
	73	int
	74	macx_swapon(
	75	char *filename,
	76	int flags,
	77	long size,
	78	long priority)
	79	{
	80	struct vnode *vp = 0;
	81	struct nameidata nd, *ndp;
	82	struct proc *p = current_proc();
	83	pager_file_t pf;
	84	register int error;
	85	kern_return_t kr;
	86	mach_port_t backing_store;
0b4e3aa0	87	memory_object_default_t default_pager;
1c79356b A	88	int i;
	89	boolean_t funnel_state;
	90
	91	struct vattr vattr;
	92
	93	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	94	ndp = &nd;
	95
	96	if ((error = suser(p->p_ucred, &p->p_acflag)))
	97	goto swapon_bailout;
	98
1c79356b A	99	if(default_pager_init_flag == 0) {
	100	start_def_pager(NULL);
	101	default_pager_init_flag = 1;
	102	}
	103
	104	/*
	105	* Get a vnode for the paging area.
	106	*/
	107	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF, UIO_USERSPACE,
	108	filename, p);
	109
	110	if ((error = namei(ndp)))
	111	goto swapon_bailout;
	112	vp = ndp->ni_vp;
	113
	114	if (vp->v_type != VREG) {
	115	error = EINVAL;
	116	VOP_UNLOCK(vp, 0, p);
	117	goto swapon_bailout;
	118	}
	119	UBCINFOCHECK("macx_swapon", vp);
	120
	121	if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) {
	122	VOP_UNLOCK(vp, 0, p);
	123	goto swapon_bailout;
	124	}
	125
	126	if (vattr.va_size < (u_quad_t)size) {
	127	vattr_null(&vattr);
	128	vattr.va_size = (u_quad_t)size;
	129	error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
	130	if (error) {
	131	VOP_UNLOCK(vp, 0, p);
	132	goto swapon_bailout;
	133	}
	134	}
	135
	136	/* add new backing store to list */
	137	i = 0;
	138	while(bs_port_table[i].vp != 0) {
	139	if(i == MAX_BACKING_STORE)
	140	break;
	141	i++;
	142	}
	143	if(i == MAX_BACKING_STORE) {
	144	error = ENOMEM;
	145	VOP_UNLOCK(vp, 0, p);
	146	goto swapon_bailout;
	147	}
	148
	149	/* remember the vnode. This vnode has namei() reference */
	150	bs_port_table[i].vp = vp;
	151
	152	/*
	153	* Look to see if we are already paging to this file.
	154	*/
	155	/* make certain the copy send of kernel call will work */
0b4e3aa0 A	156	default_pager = MEMORY_OBJECT_DEFAULT_NULL;
0b4e3aa0 A	157	kr = host_default_memory_manager(host_priv_self(), &default_pager, 0);
1c79356b A	158	if(kr != KERN_SUCCESS) {
	159	error = EAGAIN;
	160	VOP_UNLOCK(vp, 0, p);
	161	bs_port_table[i].vp = 0;
	162	goto swapon_bailout;
	163	}
	164
0b4e3aa0	165	kr = default_pager_backing_store_create(default_pager,
1c79356b A	166	-1, /* default priority */
	167	0, /* default cluster size */
	168	&backing_store);
0b4e3aa0 A	169	memory_object_default_deallocate(default_pager);
0b4e3aa0 A	170
1c79356b A	171	if(kr != KERN_SUCCESS) {
	172	error = ENOMEM;
	173	VOP_UNLOCK(vp, 0, p);
	174	bs_port_table[i].vp = 0;
	175	goto swapon_bailout;
	176	}
	177
	178	/*
	179	* NOTE: we are able to supply PAGE_SIZE here instead of
	180	* an actual record size or block number because:
	181	* a: we do not support offsets from the beginning of the
	182	* file (allowing for non page size/record modulo offsets.
	183	* b: because allow paging will be done modulo page size
	184	*/
	185
	186	VOP_UNLOCK(vp, 0, p);
	187	kr = default_pager_add_file(backing_store, vp, PAGE_SIZE,
	188	((int)vattr.va_size)/PAGE_SIZE);
	189	if(kr != KERN_SUCCESS) {
	190	bs_port_table[i].vp = 0;
	191	if(kr == KERN_INVALID_ARGUMENT)
	192	error = EINVAL;
	193	else
	194	error = ENOMEM;
	195	goto swapon_bailout;
	196	}
	197	bs_port_table[i].bs = (void *)backing_store;
	198	error = 0;
	199	if (!ubc_hold(vp))
	200	panic("macx_swapon: hold");
	201
	202	/* Mark this vnode as being used for swapfile */
	203	SET(vp->v_flag, VSWAP);
	204
	205	/*
	206	* take an extra reference on the vnode to keep
	207	* vnreclaim() away from this vnode.
	208	*/
	209	VREF(vp);
	210
	211	/* Hold on to the namei reference to the paging file vnode */
	212	vp = 0;
	213
	214	swapon_bailout:
	215	if (vp) {
	216	vrele(vp);
	217	}
1c79356b A	218	(void) thread_funnel_set(kernel_flock, FALSE);
	219	return(error);
	220	}
	221
	222	/*
	223	* Routine: macx_swapoff
	224	* Function:
	225	* Syscall interface to remove a file from backing store
	226	*/
	227	int
	228	macx_swapoff(
	229	char *filename,
	230	int flags)
	231	{
	232	kern_return_t kr;
	233	mach_port_t backing_store;
	234
	235	struct vnode *vp = 0;
	236	struct nameidata nd, *ndp;
	237	struct proc *p = current_proc();
	238	int i;
	239	int error;
	240	boolean_t funnel_state;
	241
	242	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	243	backing_store = NULL;
	244	ndp = &nd;
	245
	246	if ((error = suser(p->p_ucred, &p->p_acflag)))
	247	goto swapoff_bailout;
	248
1c79356b A	249	/*
	250	* Get the vnode for the paging area.
	251	*/
	252	NDINIT(ndp, LOOKUP, FOLLOW \| LOCKLEAF, UIO_USERSPACE,
	253	filename, p);
	254
	255	if ((error = namei(ndp)))
	256	goto swapoff_bailout;
	257	vp = ndp->ni_vp;
	258
	259	if (vp->v_type != VREG) {
	260	error = EINVAL;
	261	VOP_UNLOCK(vp, 0, p);
	262	goto swapoff_bailout;
	263	}
	264
	265	for(i = 0; i < MAX_BACKING_STORE; i++) {
	266	if(bs_port_table[i].vp == vp) {
	267	backing_store;
	268	break;
	269	}
	270	}
	271	if (i == MAX_BACKING_STORE) {
	272	error = EINVAL;
	273	VOP_UNLOCK(vp, 0, p);
	274	goto swapoff_bailout;
	275	}
	276	backing_store = (mach_port_t)bs_port_table[i].bs;
	277
	278	VOP_UNLOCK(vp, 0, p);
	279	kr = default_pager_backing_store_delete(backing_store);
	280	switch (kr) {
	281	case KERN_SUCCESS:
	282	error = 0;
	283	bs_port_table[i].vp = 0;
	284	ubc_rele(vp);
	285	/* This vnode is no longer used for swapfile */
	286	CLR(vp->v_flag, VSWAP);
	287
	288	/* get rid of macx_swapon() namei() reference */
	289	vrele(vp);
	290
	291	/* get rid of macx_swapon() "extra" reference */
	292	vrele(vp);
	293	break;
	294	case KERN_FAILURE:
	295	error = EAGAIN;
	296	break;
	297	default:
	298	error = EAGAIN;
	299	break;
	300	}
	301
	302	swapoff_bailout:
	303	/* get rid of macx_swapoff() namei() reference */
	304	if (vp)
	305	vrele(vp);
	306
1c79356b A	307	(void) thread_funnel_set(kernel_flock, FALSE);
	308	return(error);
	309	}