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103 lines
4.1 KiB
C
103 lines
4.1 KiB
C
/*
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
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* $Id: swap_pager.h,v 1.5 1995/02/02 09:08:09 davidg Exp $
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*/
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/*
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* Modifications to the block allocation data structure by John S. Dyson
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* 18 Dec 93.
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*/
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#ifndef _SWAP_PAGER_
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#define _SWAP_PAGER_ 1
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/*
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* SWB_NPAGES can be set to any value from 1 to 16 pages per allocation,
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* however, due to the allocation spilling into non-swap pager backed memory,
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* suggest keeping SWB_NPAGES small (1-4). If high performance is manditory
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* perhaps up to 8 pages might be in order????
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* Above problem has been fixed, now we support 16 pages per block. Unused
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* space is recovered by the swap pager now...
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*/
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#define SWB_NPAGES 8
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struct swblock {
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unsigned short swb_valid; /* bitmask for valid pages */
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unsigned short swb_locked; /* block locked */
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int swb_block[SWB_NPAGES]; /* unfortunately int instead of daddr_t */
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};
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typedef struct swblock *sw_blk_t;
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/*
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* Swap pager private data.
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*/
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struct swpager {
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vm_size_t sw_osize; /* size of object we are backing (bytes) */
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int sw_nblocks; /* number of blocks in list (sw_blk_t units) */
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int sw_allocsize; /* amount of space actually allocated */
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sw_blk_t sw_blocks; /* pointer to list of swap blocks */
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short sw_flags; /* flags */
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short sw_poip; /* pageouts in progress */
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short sw_piip; /* pageins in progress */
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};
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typedef struct swpager *sw_pager_t;
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#define SW_WANTED 0x01
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#define SW_NAMED 0x02
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#ifdef KERNEL
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void swap_pager_init(void);
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vm_pager_t swap_pager_alloc(void *, vm_size_t, vm_prot_t, vm_offset_t);
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void swap_pager_dealloc(vm_pager_t);
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boolean_t swap_pager_getpage(vm_pager_t, vm_page_t, boolean_t);
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boolean_t swap_pager_putpage(vm_pager_t, vm_page_t, boolean_t);
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boolean_t swap_pager_getmulti(vm_pager_t, vm_page_t *, int, int, boolean_t);
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boolean_t swap_pager_haspage(vm_pager_t, vm_offset_t);
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int swap_pager_io(sw_pager_t, vm_page_t *, int, int, int);
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void swap_pager_iodone(struct buf *);
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boolean_t swap_pager_clean();
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void swap_pager_copy __P((vm_pager_t, vm_offset_t, vm_pager_t, vm_offset_t, vm_offset_t));
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void swap_pager_freespace __P((vm_pager_t, vm_offset_t, vm_offset_t));
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extern struct pagerops swappagerops;
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#endif
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#endif /* _SWAP_PAGER_ */
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