[apple/xnu.git] / bsd / vm / vnode_pager.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@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1987 Carnegie-Mellon University
 * All rights reserved.  The CMU software License Agreement specifies
 * the terms and conditions for use and redistribution.
 */
/*
 *	File:	vnode_pager.c
 *
 *	"Swap" pager that pages to/from vnodes.  Also
 *	handles demand paging from files.
 *
 */

#include <mach/boolean.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/mount.h>
#include <sys/ubc.h>
#include <sys/lock.h>

#include <mach/mach_types.h>
#include <mach/memory_object_types.h>

#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <kern/zalloc.h>
#include <kern/kalloc.h>
#include <libkern/libkern.h>

#include <vm/vnode_pager.h>
#include <vm/vm_pageout.h>

#include <kern/assert.h>
#include <sys/kdebug.h>

unsigned int vp_pagein=0;
unsigned int vp_pgodirty=0;
unsigned int vp_pgoclean=0;
unsigned int dp_pgouts=0;	/* Default pager pageouts */
unsigned int dp_pgins=0;	/* Default pager pageins */

vm_object_offset_t
vnode_pager_get_filesize(struct vnode *vp)
{
	if (UBCINVALID(vp)) {
		return (vm_object_offset_t) 0;
	}

	return (vm_object_offset_t) ubc_getsize(vp);
	
}

pager_return_t
vnode_pageout(struct vnode *vp,
	upl_t			upl,
	vm_offset_t		upl_offset,
	vm_object_offset_t	f_offset,
	vm_size_t		size,
	int			flags,
	int			*errorp)
{
	int		result = PAGER_SUCCESS;
	struct proc 	*p = current_proc();
	int		error = 0;
	int blkno=0, s;
	int cnt, isize;
	int pg_index;
	int offset;
	struct buf *bp;
	boolean_t	funnel_state;
	upl_page_info_t *pl;
	upl_t vpupl = NULL;

	funnel_state = thread_funnel_set(kernel_flock, TRUE);

	isize = (int)size;

	if (isize <= 0) {
	        result = error = PAGER_ERROR;
		goto out;
	}
	UBCINFOCHECK("vnode_pageout", vp);

	if (UBCINVALID(vp)) {
		result = error = PAGER_ERROR;

		if (upl && !(flags & UPL_NOCOMMIT))
		        ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
		goto out;
	}
	if (upl) {
		/*
		 * This is a pageout from the Default pager,
		 * just go ahead and call VOP_PAGEOUT
		 */
		dp_pgouts++;

		KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, 
				      size, 1, 0, 0, 0);

		if (error = VOP_PAGEOUT(vp, upl, upl_offset, (off_t)f_offset,
					(size_t)size, p->p_ucred, flags))
			result = error = PAGER_ERROR;

		KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, 
				      size, 1, 0, 0, 0);

		goto out;
	}
	ubc_create_upl(vp, f_offset, isize, &vpupl, &pl, UPL_COPYOUT_FROM);

	if (vpupl == (upl_t) 0) {
		result = error = PAGER_ABSENT;
		goto out;
	}
	/*
	 * if we get here, we've created the upl and
	 * are responsible for commiting/aborting it
	 * regardless of what the caller has passed in
	 */
	flags &= ~UPL_NOCOMMIT;

	if (ubc_getsize(vp) == 0) {
		for (offset = 0; isize; isize -= PAGE_SIZE,
					offset += PAGE_SIZE) {
			blkno = ubc_offtoblk(vp, (off_t)f_offset);
			f_offset += PAGE_SIZE;
			if ((bp = incore(vp, blkno)) &&
			    ISSET(bp->b_flags, B_BUSY)) {
				ubc_upl_abort_range(vpupl, offset, PAGE_SIZE,
						    UPL_ABORT_FREE_ON_EMPTY);
				result = error = PAGER_ERROR;
				continue;
			} else if (bp) {
				bremfree(bp);
				SET(bp->b_flags, B_BUSY | B_INVAL);
				brelse(bp);
			}
			ubc_upl_commit_range(vpupl, offset, PAGE_SIZE,
					     UPL_COMMIT_FREE_ON_EMPTY);
		}
		goto out;
	}
	pg_index = 0;
	offset   = 0;

	while (isize) {
		int  xsize;
		int  num_of_pages;

		if ( !upl_valid_page(pl, pg_index)) {
			ubc_upl_abort_range(vpupl, offset, PAGE_SIZE,
					    UPL_ABORT_FREE_ON_EMPTY);
			offset += PAGE_SIZE;
			isize  -= PAGE_SIZE;
			pg_index++;

			continue;
		}
		if ( !upl_dirty_page(pl, pg_index)) {
			/*
			 * if the page is not dirty and reached here it is
			 * marked precious or it is due to invalidation in
			 * memory_object_lock request as part of truncation
			 * We also get here from vm_object_terminate()
			 * So all you need to do in these
			 * cases is to invalidate incore buffer if it is there
			 * Note we must not sleep here if B_BUSY - that is
			 * a lock inversion which causes deadlock.
			 */
			blkno = ubc_offtoblk(vp, (off_t)(f_offset + offset));
			s = splbio();
			vp_pgoclean++;			
			if ((bp = incore(vp, blkno)) &&
			    ISSET(bp->b_flags, B_BUSY | B_NEEDCOMMIT)) {
				splx(s);
				ubc_upl_abort_range(vpupl, offset, PAGE_SIZE,
						    UPL_ABORT_FREE_ON_EMPTY);
				result = error = PAGER_ERROR;
				offset += PAGE_SIZE;
				isize -= PAGE_SIZE;
				pg_index++;
				continue;
			} else if (bp) {
			        bremfree(bp);
				SET(bp->b_flags, B_BUSY | B_INVAL );
				splx(s);
				brelse(bp);
			} else
				splx(s);

			ubc_upl_commit_range(vpupl, offset, PAGE_SIZE, 
					     UPL_COMMIT_FREE_ON_EMPTY);
			offset += PAGE_SIZE;
			isize  -= PAGE_SIZE;
			pg_index++;

			continue;
		}
		vp_pgodirty++;

		num_of_pages = 1;
		xsize = isize - PAGE_SIZE;

		while (xsize) {
			if ( !upl_valid_page(pl, pg_index + num_of_pages))
				break;
			if ( !upl_dirty_page(pl, pg_index + num_of_pages))
				break;
			num_of_pages++;
			xsize -= PAGE_SIZE;
		}
		xsize = num_of_pages * PAGE_SIZE;

		KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, 
				      xsize, 0, 0, 0, 0);

		if (error = VOP_PAGEOUT(vp, vpupl, (vm_offset_t)offset,
					(off_t)(f_offset + offset), xsize,
					p->p_ucred, flags))
			result = error = PAGER_ERROR;

		KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, 
				      xsize, 0, 0, 0, 0);

		offset += xsize;
		isize  -= xsize;
		pg_index += num_of_pages;
	}
out:
	if (errorp)
		*errorp = result;

	thread_funnel_set(kernel_flock, funnel_state);

	return (error);
}


pager_return_t
vnode_pagein(
	struct vnode 		*vp,
	upl_t        		upl,
	vm_offset_t  		upl_offset,
	vm_object_offset_t	f_offset,
	vm_size_t     		size,
	int           		flags,
	int 			*errorp)
{
        struct proc     *p = current_proc();
        upl_page_info_t *pl;
	int	        result = PAGER_SUCCESS;
	int		error = 0;
	int		xfer_size;
        int             pages_in_upl;
        int             start_pg;
        int             last_pg;
	int             first_pg;
        int             xsize;
	int             abort_needed = 1;
	boolean_t	funnel_state;


	funnel_state = thread_funnel_set(kernel_flock, TRUE);

	UBCINFOCHECK("vnode_pagein", vp);

	if (UBCINVALID(vp)) {
		result = PAGER_ERROR;
		error  = PAGER_ERROR;
		if (upl && !(flags & UPL_NOCOMMIT)) {
			ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR);
		}
		goto out;
	}
	if (upl == (upl_t)NULL) {
	        if (size > (MAX_UPL_TRANSFER * PAGE_SIZE)) {
		        result = PAGER_ERROR;
			error  = PAGER_ERROR;
			goto out;
		}
	        ubc_create_upl(vp, f_offset, size, &upl, &pl, UPL_RET_ONLY_ABSENT);

		if (upl == (upl_t)NULL) {
		        result =  PAGER_ABSENT;
			error = PAGER_ABSENT;
			goto out;
		}
		upl_offset = 0;
		/*
		 * if we get here, we've created the upl and
		 * are responsible for commiting/aborting it
		 * regardless of what the caller has passed in
		 */
		flags &= ~UPL_NOCOMMIT;
		
		vp_pagein++;
	} else {
	        pl = ubc_upl_pageinfo(upl);

		dp_pgins++;
	}
	pages_in_upl = size / PAGE_SIZE;
	first_pg     = upl_offset / PAGE_SIZE;

	/*
	 * before we start marching forward, we must make sure we end on 
	 * a present page, otherwise we will be working with a freed
         * upl
	 */
	for (last_pg = pages_in_upl - 1; last_pg >= first_pg; last_pg--) {
		if (upl_page_present(pl, last_pg))
			break;
	}
	pages_in_upl = last_pg + 1;

	for (last_pg = first_pg; last_pg < pages_in_upl;) {
	        /*
		 * scan the upl looking for the next
		 * page that is present.... if all of the 
		 * pages are absent, we're done
		 */
	        for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
		        if (upl_page_present(pl, last_pg))
			        break;
		}
		if (last_pg == pages_in_upl)
		        break;

	        /*
		 * if we get here, we've sitting on a page 
		 * that is present... we want to skip over
		 * any range of 'valid' pages... if this takes
		 * us to the end of the request, than we're done
		 */
	        for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
		        if (!upl_valid_page(pl, last_pg) || !upl_page_present(pl, last_pg))
			        break;
		}
		if (last_pg > start_pg) {
		        /*
			 * we've found a range of valid pages
			 * if we've got COMMIT responsibility
			 * commit this range of pages back to the
			 * cache unchanged
			 */
		        xsize = (last_pg - start_pg) * PAGE_SIZE;

			if (!(flags & UPL_NOCOMMIT))
			        ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, xsize, UPL_ABORT_FREE_ON_EMPTY);

			abort_needed = 0;
		}
		if (last_pg == pages_in_upl)
		        break;

		if (!upl_page_present(pl, last_pg))
		        /*
			 * if we found a range of valid pages 
			 * terminated by a non-present page
			 * than start over
			 */
		        continue;

		/*
		 * scan from the found invalid page looking for a valid
		 * or non-present page before the end of the upl is reached, if we
		 * find one, then it will be the last page of the request to
		 * 'cluster_io'
		 */
		for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
		        if (upl_valid_page(pl, last_pg) || !upl_page_present(pl, last_pg))
			        break;
		}
		if (last_pg > start_pg) {
		        int xoff;

		        xsize = (last_pg - start_pg) * PAGE_SIZE;
			xoff  = start_pg * PAGE_SIZE;

			if (error = VOP_PAGEIN(vp, upl, (vm_offset_t) xoff,
					       (off_t)f_offset + xoff,
					       xsize, p->p_ucred,
					       flags)) {
				result = PAGER_ERROR;
				error  = PAGER_ERROR;

			}
			abort_needed = 0;
		}
        }
	if (!(flags & UPL_NOCOMMIT) && abort_needed)
	        ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
out:
	if (errorp)
		*errorp = result;
	thread_funnel_set(kernel_flock, funnel_state);

	return (error);
}

void
vnode_pager_shutdown()
{
	int i;
	extern struct bs_map  bs_port_table[];
	struct vnode *vp;

	for(i = 0; i < MAX_BACKING_STORE; i++) {
		vp = (struct vnode *)(bs_port_table[i]).vp;
		if (vp) {
			(bs_port_table[i]).vp = 0;
			ubc_rele(vp);
			/* get rid of macx_swapon() namei() reference */
			vrele(vp);

			/* get rid of macx_swapon() "extra" reference */
			vrele(vp);
		}
	}
}


void *
upl_get_internal_page_list(upl_t upl)
{
  return(UPL_GET_INTERNAL_PAGE_LIST(upl));

}
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	* Mach Operating System
	24	* Copyright (c) 1987 Carnegie-Mellon University
	25	* All rights reserved. The CMU software License Agreement specifies
	26	* the terms and conditions for use and redistribution.
	27	*/
	28	/*
	29	* File: vnode_pager.c
	30	*
	31	* "Swap" pager that pages to/from vnodes. Also
	32	* handles demand paging from files.
	33	*
	34	*/
	35
	36	#include <mach/boolean.h>
	37	#include <sys/param.h>
	38	#include <sys/systm.h>
	39	#include <sys/proc.h>
	40	#include <sys/buf.h>
	41	#include <sys/uio.h>
	42	#include <sys/vnode.h>
	43	#include <sys/namei.h>
	44	#include <sys/mount.h>
	45	#include <sys/ubc.h>
	46	#include <sys/lock.h>
	47
	48	#include <mach/mach_types.h>
	49	#include <mach/memory_object_types.h>
	50
	51	#include <vm/vm_map.h>
	52	#include <vm/vm_kern.h>
1c79356b A	53	#include <kern/zalloc.h>
	54	#include <kern/kalloc.h>
	55	#include <libkern/libkern.h>
	56
	57	#include <vm/vnode_pager.h>
	58	#include <vm/vm_pageout.h>
	59
	60	#include <kern/assert.h>
9bccf70c	61	#include <sys/kdebug.h>
1c79356b A	62
	63	unsigned int vp_pagein=0;
	64	unsigned int vp_pgodirty=0;
	65	unsigned int vp_pgoclean=0;
	66	unsigned int dp_pgouts=0; /* Default pager pageouts */
	67	unsigned int dp_pgins=0; /* Default pager pageins */
	68
0b4e3aa0 A	69	vm_object_offset_t
	70	vnode_pager_get_filesize(struct vnode *vp)
	71	{
	72	if (UBCINVALID(vp)) {
	73	return (vm_object_offset_t) 0;
	74	}
	75
	76	return (vm_object_offset_t) ubc_getsize(vp);
	77
	78	}
	79
1c79356b A	80	pager_return_t
	81	vnode_pageout(struct vnode *vp,
	82	upl_t upl,
	83	vm_offset_t upl_offset,
	84	vm_object_offset_t f_offset,
	85	vm_size_t size,
	86	int flags,
	87	int *errorp)
	88	{
	89	int result = PAGER_SUCCESS;
	90	struct proc *p = current_proc();
	91	int error = 0;
1c79356b A	92	int blkno=0, s;
	93	int cnt, isize;
	94	int pg_index;
	95	int offset;
	96	struct buf *bp;
	97	boolean_t funnel_state;
1c79356b	98	upl_page_info_t *pl;
0b4e3aa0	99	upl_t vpupl = NULL;
1c79356b A	100
	101	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	102
1c79356b A	103	isize = (int)size;
1c79356b A	104
9bccf70c A	105	if (isize <= 0) {
	106	result = error = PAGER_ERROR;
	107	goto out;
	108	}
1c79356b A	109	UBCINFOCHECK("vnode_pageout", vp);
	110
	111	if (UBCINVALID(vp)) {
9bccf70c A	112	result = error = PAGER_ERROR;
9bccf70c A	113
fa4905b1	114	if (upl && !(flags & UPL_NOCOMMIT))
9bccf70c	115	ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
1c79356b A	116	goto out;
1c79356b A	117	}
fa4905b1	118	if (upl) {
1c79356b	119	/*
fa4905b1	120	* This is a pageout from the Default pager,
1c79356b A	121	* just go ahead and call VOP_PAGEOUT
	122	*/
	123	dp_pgouts++;
9bccf70c A	124
	125	KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) \| DBG_FUNC_START,
	126	size, 1, 0, 0, 0);
	127
fa4905b1 A	128	if (error = VOP_PAGEOUT(vp, upl, upl_offset, (off_t)f_offset,
	129	(size_t)size, p->p_ucred, flags))
	130	result = error = PAGER_ERROR;
9bccf70c A	131
	132	KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) \| DBG_FUNC_END,
	133	size, 1, 0, 0, 0);
	134
1c79356b A	135	goto out;
1c79356b A	136	}
de355530	137	ubc_create_upl(vp, f_offset, isize, &vpupl, &pl, UPL_COPYOUT_FROM);
9bccf70c A	138
	139	if (vpupl == (upl_t) 0) {
	140	result = error = PAGER_ABSENT;
	141	goto out;
	142	}
	143	/*
	144	* if we get here, we've created the upl and
	145	* are responsible for commiting/aborting it
	146	* regardless of what the caller has passed in
	147	*/
	148	flags &= ~UPL_NOCOMMIT;
1c79356b	149
fa4905b1 A	150	if (ubc_getsize(vp) == 0) {
	151	for (offset = 0; isize; isize -= PAGE_SIZE,
	152	offset += PAGE_SIZE) {
1c79356b	153	blkno = ubc_offtoblk(vp, (off_t)f_offset);
1c79356b	154	f_offset += PAGE_SIZE;
fa4905b1 A	155	if ((bp = incore(vp, blkno)) &&
	156	ISSET(bp->b_flags, B_BUSY)) {
	157	ubc_upl_abort_range(vpupl, offset, PAGE_SIZE,
	158	UPL_ABORT_FREE_ON_EMPTY);
	159	result = error = PAGER_ERROR;
	160	continue;
	161	} else if (bp) {
	162	bremfree(bp);
	163	SET(bp->b_flags, B_BUSY \| B_INVAL);
	164	brelse(bp);
	165	}
	166	ubc_upl_commit_range(vpupl, offset, PAGE_SIZE,
	167	UPL_COMMIT_FREE_ON_EMPTY);
1c79356b	168	}
1c79356b A	169	goto out;
	170	}
	171	pg_index = 0;
	172	offset = 0;
	173
	174	while (isize) {
	175	int xsize;
	176	int num_of_pages;
	177
	178	if ( !upl_valid_page(pl, pg_index)) {
0b4e3aa0	179	ubc_upl_abort_range(vpupl, offset, PAGE_SIZE,
fa4905b1	180	UPL_ABORT_FREE_ON_EMPTY);
1c79356b A	181	offset += PAGE_SIZE;
	182	isize -= PAGE_SIZE;
	183	pg_index++;
	184
	185	continue;
	186	}
	187	if ( !upl_dirty_page(pl, pg_index)) {
	188	/*
	189	* if the page is not dirty and reached here it is
	190	* marked precious or it is due to invalidation in
	191	* memory_object_lock request as part of truncation
	192	* We also get here from vm_object_terminate()
	193	* So all you need to do in these
	194	* cases is to invalidate incore buffer if it is there
fa4905b1 A	195	* Note we must not sleep here if B_BUSY - that is
fa4905b1 A	196	* a lock inversion which causes deadlock.
1c79356b A	197	*/
	198	blkno = ubc_offtoblk(vp, (off_t)(f_offset + offset));
	199	s = splbio();
	200	vp_pgoclean++;
fa4905b1 A	201	if ((bp = incore(vp, blkno)) &&
	202	ISSET(bp->b_flags, B_BUSY \| B_NEEDCOMMIT)) {
	203	splx(s);
	204	ubc_upl_abort_range(vpupl, offset, PAGE_SIZE,
	205	UPL_ABORT_FREE_ON_EMPTY);
	206	result = error = PAGER_ERROR;
	207	offset += PAGE_SIZE;
	208	isize -= PAGE_SIZE;
	209	pg_index++;
	210	continue;
	211	} else if (bp) {
	212	bremfree(bp);
	213	SET(bp->b_flags, B_BUSY \| B_INVAL );
	214	splx(s);
1c79356b	215	brelse(bp);
fa4905b1 A	216	} else
fa4905b1 A	217	splx(s);
1c79356b	218
0b4e3aa0	219	ubc_upl_commit_range(vpupl, offset, PAGE_SIZE,
fa4905b1	220	UPL_COMMIT_FREE_ON_EMPTY);
1c79356b A	221	offset += PAGE_SIZE;
	222	isize -= PAGE_SIZE;
	223	pg_index++;
	224
	225	continue;
	226	}
	227	vp_pgodirty++;
	228
	229	num_of_pages = 1;
	230	xsize = isize - PAGE_SIZE;
	231
	232	while (xsize) {
	233	if ( !upl_valid_page(pl, pg_index + num_of_pages))
	234	break;
	235	if ( !upl_dirty_page(pl, pg_index + num_of_pages))
	236	break;
	237	num_of_pages++;
	238	xsize -= PAGE_SIZE;
	239	}
	240	xsize = num_of_pages * PAGE_SIZE;
	241
9bccf70c A	242	KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) \| DBG_FUNC_START,
	243	xsize, 0, 0, 0, 0);
	244
fa4905b1 A	245	if (error = VOP_PAGEOUT(vp, vpupl, (vm_offset_t)offset,
fa4905b1 A	246	(off_t)(f_offset + offset), xsize,
9bccf70c	247	p->p_ucred, flags))
fa4905b1	248	result = error = PAGER_ERROR;
9bccf70c A	249
	250	KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) \| DBG_FUNC_END,
	251	xsize, 0, 0, 0, 0);
	252
1c79356b A	253	offset += xsize;
	254	isize -= xsize;
	255	pg_index += num_of_pages;
	256	}
	257	out:
	258	if (errorp)
	259	*errorp = result;
	260
	261	thread_funnel_set(kernel_flock, funnel_state);
	262
	263	return (error);
	264	}
	265
	266
	267	pager_return_t
	268	vnode_pagein(
	269	struct vnode *vp,
9bccf70c A	270	upl_t upl,
9bccf70c A	271	vm_offset_t upl_offset,
1c79356b A	272	vm_object_offset_t f_offset,
	273	vm_size_t size,
	274	int flags,
	275	int *errorp)
	276	{
9bccf70c A	277	struct proc *p = current_proc();
	278	upl_page_info_t *pl;
	279	int result = PAGER_SUCCESS;
1c79356b	280	int error = 0;
0b4e3aa0	281	int xfer_size;
9bccf70c A	282	int pages_in_upl;
	283	int start_pg;
	284	int last_pg;
	285	int first_pg;
	286	int xsize;
	287	int abort_needed = 1;
1c79356b	288	boolean_t funnel_state;
9bccf70c	289
1c79356b A	290
	291	funnel_state = thread_funnel_set(kernel_flock, TRUE);
	292
1c79356b A	293	UBCINFOCHECK("vnode_pagein", vp);
	294
	295	if (UBCINVALID(vp)) {
	296	result = PAGER_ERROR;
	297	error = PAGER_ERROR;
9bccf70c A	298	if (upl && !(flags & UPL_NOCOMMIT)) {
9bccf70c A	299	ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY \| UPL_ABORT_ERROR);
fa4905b1	300	}
1c79356b A	301	goto out;
1c79356b A	302	}
9bccf70c A	303	if (upl == (upl_t)NULL) {
	304	if (size > (MAX_UPL_TRANSFER * PAGE_SIZE)) {
	305	result = PAGER_ERROR;
	306	error = PAGER_ERROR;
	307	goto out;
	308	}
	309	ubc_create_upl(vp, f_offset, size, &upl, &pl, UPL_RET_ONLY_ABSENT);
1c79356b	310
9bccf70c A	311	if (upl == (upl_t)NULL) {
	312	result = PAGER_ABSENT;
	313	error = PAGER_ABSENT;
	314	goto out;
1c79356b	315	}
9bccf70c A	316	upl_offset = 0;
	317	/*
	318	* if we get here, we've created the upl and
	319	* are responsible for commiting/aborting it
	320	* regardless of what the caller has passed in
	321	*/
	322	flags &= ~UPL_NOCOMMIT;
	323
	324	vp_pagein++;
1c79356b	325	} else {
9bccf70c	326	pl = ubc_upl_pageinfo(upl);
1c79356b	327
9bccf70c A	328	dp_pgins++;
	329	}
	330	pages_in_upl = size / PAGE_SIZE;
	331	first_pg = upl_offset / PAGE_SIZE;
	332
	333	/*
	334	* before we start marching forward, we must make sure we end on
	335	* a present page, otherwise we will be working with a freed
	336	* upl
	337	*/
	338	for (last_pg = pages_in_upl - 1; last_pg >= first_pg; last_pg--) {
	339	if (upl_page_present(pl, last_pg))
	340	break;
	341	}
	342	pages_in_upl = last_pg + 1;
	343
	344	for (last_pg = first_pg; last_pg < pages_in_upl;) {
	345	/*
	346	* scan the upl looking for the next
	347	* page that is present.... if all of the
	348	* pages are absent, we're done
	349	*/
	350	for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
	351	if (upl_page_present(pl, last_pg))
	352	break;
	353	}
	354	if (last_pg == pages_in_upl)
	355	break;
	356
	357	/*
	358	* if we get here, we've sitting on a page
	359	* that is present... we want to skip over
	360	* any range of 'valid' pages... if this takes
	361	* us to the end of the request, than we're done
	362	*/
	363	for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
	364	if (!upl_valid_page(pl, last_pg) \|\| !upl_page_present(pl, last_pg))
	365	break;
	366	}
	367	if (last_pg > start_pg) {
	368	/*
	369	* we've found a range of valid pages
	370	* if we've got COMMIT responsibility
	371	* commit this range of pages back to the
	372	* cache unchanged
	373	*/
	374	xsize = (last_pg - start_pg) * PAGE_SIZE;
1c79356b	375
9bccf70c A	376	if (!(flags & UPL_NOCOMMIT))
9bccf70c A	377	ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, xsize, UPL_ABORT_FREE_ON_EMPTY);
1c79356b	378
9bccf70c A	379	abort_needed = 0;
	380	}
	381	if (last_pg == pages_in_upl)
	382	break;
	383
	384	if (!upl_page_present(pl, last_pg))
	385	/*
	386	* if we found a range of valid pages
	387	* terminated by a non-present page
	388	* than start over
	389	*/
	390	continue;
	391
	392	/*
	393	* scan from the found invalid page looking for a valid
	394	* or non-present page before the end of the upl is reached, if we
	395	* find one, then it will be the last page of the request to
	396	* 'cluster_io'
	397	*/
	398	for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) {
	399	if (upl_valid_page(pl, last_pg) \|\| !upl_page_present(pl, last_pg))
	400	break;
	401	}
	402	if (last_pg > start_pg) {
	403	int xoff;
	404
	405	xsize = (last_pg - start_pg) * PAGE_SIZE;
	406	xoff = start_pg * PAGE_SIZE;
	407
	408	if (error = VOP_PAGEIN(vp, upl, (vm_offset_t) xoff,
	409	(off_t)f_offset + xoff,
	410	xsize, p->p_ucred,
	411	flags)) {
0b4e3aa0 A	412	result = PAGER_ERROR;
0b4e3aa0 A	413	error = PAGER_ERROR;
9bccf70c	414
0b4e3aa0	415	}
9bccf70c	416	abort_needed = 0;
1c79356b	417	}
9bccf70c A	418	}
	419	if (!(flags & UPL_NOCOMMIT) && abort_needed)
	420	ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY);
1c79356b A	421	out:
1c79356b A	422	if (errorp)
fa4905b1	423	*errorp = result;
1c79356b A	424	thread_funnel_set(kernel_flock, funnel_state);
	425
	426	return (error);
	427	}
	428
	429	void
	430	vnode_pager_shutdown()
	431	{
	432	int i;
	433	extern struct bs_map bs_port_table[];
	434	struct vnode *vp;
	435
	436	for(i = 0; i < MAX_BACKING_STORE; i++) {
	437	vp = (struct vnode *)(bs_port_table[i]).vp;
	438	if (vp) {
	439	(bs_port_table[i]).vp = 0;
	440	ubc_rele(vp);
	441	/* get rid of macx_swapon() namei() reference */
	442	vrele(vp);
	443
	444	/* get rid of macx_swapon() "extra" reference */
	445	vrele(vp);
	446	}
	447	}
	448	}
	449
0b4e3aa0 A	450
0b4e3aa0 A	451	void *
1c79356b A	452	upl_get_internal_page_list(upl_t upl)
1c79356b A	453	{
0b4e3aa0	454	return(UPL_GET_INTERNAL_PAGE_LIST(upl));
1c79356b A	455
1c79356b A	456	}