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(there are still some details to work out) but expect that to go away soon. To support these basic changes (creation of lfs_putpages, lfs_gop_write, mods to lfs_balloc) several other changes were made, to wit: * Create a writer daemon kernel thread whose purpose is to handle page writes for the pagedaemon, but which also takes over some of the functions of lfs_check(). This thread is started the first time an LFS is mounted. * Add a "flags" parameter to GOP_SIZE. Current values are GOP_SIZE_READ, meaning that the call should return the size of the in-core version of the file, and GOP_SIZE_WRITE, meaning that it should return the on-disk size. One of GOP_SIZE_READ or GOP_SIZE_WRITE must be specified. * Instead of using malloc(...M_WAITOK) for everything, reserve enough resources to get by and use malloc(...M_NOWAIT), using the reserves if necessary. Use the pool subsystem for structures small enough that this is feasible. This also obsoletes LFS_THROTTLE. And a few that are not strictly necessary: * Moves the LFS inode extensions off onto a separately allocated structure; getting closer to LFS as an LKM. "Welcome to 1.6O." * Unified GOP_ALLOC between FFS and LFS. * Update LFS copyright headers to correct values. * Actually cast to unsigned in lfs_shellsort, like the comment says. * Keep track of which segments were empty before the previous checkpoint; any segments that pass two checkpoints both dirty and empty can be summarily cleaned. Do this. Right now lfs_segclean still works, but this should be turned into an effectless compatibility syscall.
173 lines
6.2 KiB
C
173 lines
6.2 KiB
C
/* $NetBSD: uvm_pager.h,v 1.26 2003/02/17 23:48:24 perseant Exp $ */
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/*
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*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* All rights reserved.
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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 Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: Id: uvm_pager.h,v 1.1.2.14 1998/01/13 19:00:50 chuck Exp
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*/
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/*
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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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* @(#)vm_pager.h 8.5 (Berkeley) 7/7/94
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*/
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#ifndef _UVM_UVM_PAGER_H_
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#define _UVM_UVM_PAGER_H_
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/*
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* uvm_pager.h
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*/
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/*
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* forward structure declarations
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*/
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struct uvm_faultinfo;
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/*
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* pager ops
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*/
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struct uvm_pagerops {
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/* init pager */
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void (*pgo_init) __P((void));
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/* add reference to obj */
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void (*pgo_reference)(struct uvm_object *);
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/* drop reference to obj */
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void (*pgo_detach)(struct uvm_object *);
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/* special non-standard fault processing */
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int (*pgo_fault)(struct uvm_faultinfo *, vaddr_t, struct vm_page **,
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int, int, vm_fault_t, vm_prot_t, int);
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/* get/read pages */
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int (*pgo_get)(struct uvm_object *, voff_t, struct vm_page **,
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int *, int, vm_prot_t, int, int);
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/* put/write pages */
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int (*pgo_put)(struct uvm_object *, voff_t, voff_t, int);
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};
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/* pager flags [mostly for flush] */
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#define PGO_CLEANIT 0x001 /* write dirty pages to backing store */
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#define PGO_SYNCIO 0x002 /* if PGO_CLEANIT: use sync I/O? */
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#define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */
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#define PGO_FREE 0x008 /* free flushed pages */
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/* if PGO_FREE is not set then the pages stay where they are. */
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#define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */
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#define PGO_LOCKED 0x040 /* fault data structures are locked [get] */
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#define PGO_BUSYFAIL 0x080 /* fail if a page is busy [put] */
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#define PGO_OVERWRITE 0x200 /* pages will be overwritten before unlocked */
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#define PGO_PASTEOF 0x400 /* allow allocation of pages past EOF */
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/* page we are not interested in getting */
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#define PGO_DONTCARE ((struct vm_page *) -1L) /* [get only] */
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#ifdef _KERNEL
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/*
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* handle inline options
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*/
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#ifdef UVM_PAGER_INLINE
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#define PAGER_INLINE static __inline
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#else
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#define PAGER_INLINE /* nothing */
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#endif /* UVM_PAGER_INLINE */
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/*
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* prototypes
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*/
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void uvm_pager_init __P((void));
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PAGER_INLINE struct vm_page *uvm_pageratop __P((vaddr_t));
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vaddr_t uvm_pagermapin __P((struct vm_page **, int, int));
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void uvm_pagermapout __P((vaddr_t, int));
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/* Flags to uvm_pagermapin() */
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#define UVMPAGER_MAPIN_WAITOK 0x01 /* it's okay to wait */
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#define UVMPAGER_MAPIN_READ 0x02 /* device -> host */
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#define UVMPAGER_MAPIN_WRITE 0x00 /* host -> device (pseudo flag) */
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/*
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* XXX
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* this is needed until the device strategy interface
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* is changed to do physically-addressed i/o.
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*/
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#ifndef PAGER_MAP_SIZE
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#define PAGER_MAP_SIZE (16 * 1024 * 1024)
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#endif
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#endif /* _KERNEL */
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#endif /* _UVM_UVM_PAGER_H_ */
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