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uvm_swap.h revision 1.22.16.2 
      1 /*	$NetBSD: uvm_swap.h,v 1.22.16.2 2018/03/15 09:12:07 pgoyette Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Matthew R. Green
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * from: Id: uvm_swap.h,v 1.1.2.6 1997/12/15 05:39:31 mrg Exp
     29  */
     30 
     31 #ifndef _UVM_UVM_SWAP_H_
     32 #define _UVM_UVM_SWAP_H_
     33 
     34 #define	SWSLOT_BAD	(-1)
     35 
     36 #if defined(_KERNEL) || defined(_MODULE)
     37 #if defined(_KERNEL_OPT)
     38 #include "opt_vmswap.h"
     39 #endif
     40 
     41 struct lwp;
     42 
     43 /*
     44  * swapdev: describes a single swap partition/file
     45  *
     46  * note the following should be true:
     47  * swd_inuse <= swd_nblks  [number of blocks in use is <= total blocks]
     48  * swd_nblks <= swd_mapsize [because mapsize includes miniroot+disklabel]
     49  */
     50 struct swapdev {
     51 	dev_t			swd_dev;	/* device id */
     52 	int			swd_flags;	/* flags:inuse/enable/fake */
     53 	int			swd_priority;	/* our priority */
     54 	int			swd_nblks;	/* blocks in this device */
     55 	char			*swd_path;	/* saved pathname of device */
     56 	int			swd_pathlen;	/* length of pathname */
     57 	int			swd_npages;	/* #pages we can use */
     58 	int			swd_npginuse;	/* #pages in use */
     59 	int			swd_npgbad;	/* #pages bad */
     60 	int			swd_drumoffset;	/* page0 offset in drum */
     61 	int			swd_drumsize;	/* #pages in drum */
     62 	blist_t			swd_blist;	/* blist for this swapdev */
     63 	struct vnode		*swd_vp;	/* backing vnode */
     64 	TAILQ_ENTRY(swapdev)	swd_next;	/* priority tailq */
     65 
     66 	int			swd_bsize;	/* blocksize (bytes) */
     67 	int			swd_maxactive;	/* max active i/o reqs */
     68 	struct bufq_state	*swd_tab;	/* buffer list */
     69 	int			swd_active;	/* number of active buffers */
     70 };
     71 
     72 #if defined(VMSWAP)
     73 
     74 struct swapent;
     75 
     76 int	uvm_swap_get(struct vm_page *, int, int);
     77 int	uvm_swap_put(int, struct vm_page **, int, int);
     78 int	uvm_swap_alloc(int *, bool);
     79 void	uvm_swap_free(int, int);
     80 void	uvm_swap_markbad(int, int);
     81 bool	uvm_swapisfull(void);
     82 void	swapsys_lock(krw_t);
     83 void	swapsys_unlock(void);
     84 int	uvm_swap_stats(char *, int,
     85     void (*)(void *, const struct swapent *), size_t, register_t *);
     86 
     87 #else /* defined(VMSWAP) */
     88 #define	uvm_swapisfull()	true
     89 #define uvm_swap_stats(c, l, f, count, retval) (*retval = 0, ENOSYS)
     90 #endif /* defined(VMSWAP) */
     91 
     92 void	uvm_swap_shutdown(struct lwp *);
     93 
     94 #endif /* _KERNEL || _MODULE */
     95 
     96 #endif /* _UVM_UVM_SWAP_H_ */
     97