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extent.h
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extent.h
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/* $NetBSD: extent.h,v 1.11.2.1 2005/02/04 11:48:05 skrll Exp $ */
/*-
* Copyright (c) 1996, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SYS_EXTENT_H_
#define _SYS_EXTENT_H_
#include <sys/lock.h>
#include <sys/queue.h>
struct extent_region {
LIST_ENTRY(extent_region) er_link; /* link in region list */
u_long er_start; /* start of region */
u_long er_end; /* end of region */
int er_flags; /* misc. flags */
};
/* er_flags */
#define ER_ALLOC 0x01 /* region descriptor dynamically allocated */
struct extent {
const char *ex_name; /* name of extent */
struct simplelock ex_slock; /* lock on this extent */
/* allocated regions in extent */
LIST_HEAD(, extent_region) ex_regions;
u_long ex_start; /* start of extent */
u_long ex_end; /* end of extent */
struct malloc_type *ex_mtype; /* memory type */
int ex_flags; /* misc. information */
};
struct extent_fixed {
struct extent fex_extent; /* MUST BE FIRST */
/* freelist of region descriptors */
LIST_HEAD(, extent_region) fex_freelist;
caddr_t fex_storage; /* storage space for descriptors */
size_t fex_storagesize; /* size of storage space */
};
/* ex_flags; for internal use only */
#define EXF_FIXED 0x01 /* extent uses fixed storage */
#define EXF_NOCOALESCE 0x02 /* coalescing of regions not allowed */
#define EXF_WANTED 0x04 /* someone asleep on extent */
#define EXF_FLWANTED 0x08 /* someone asleep on freelist */
#define EXF_BITS "\20\4FLWANTED\3WANTED\2NOCOALESCE\1FIXED"
/* misc. flags passed to extent functions */
#define EX_NOWAIT 0x00 /* not safe to sleep */
#define EX_WAITOK 0x01 /* safe to sleep */
#define EX_FAST 0x02 /* take first fit in extent_alloc() */
#define EX_CATCH 0x04 /* catch signals while sleeping */
#define EX_NOCOALESCE 0x08 /* create a non-coalescing extent */
#define EX_MALLOCOK 0x10 /* safe to call malloc() */
#define EX_WAITSPACE 0x20 /* wait for space to become free */
#define EX_BOUNDZERO 0x40 /* boundary lines start at 0 */
/*
* Special place holders for "alignment" and "boundary" arguments,
* in the event the caller doesn't wish to use those features.
*/
#define EX_NOALIGN 1 /* don't do alignment */
#define EX_NOBOUNDARY 0 /* don't do boundary checking */
#if defined(_KERNEL) || defined(_EXTENT_TESTING)
#define EXTENT_FIXED_STORAGE_SIZE(_nregions) \
(ALIGN(sizeof(struct extent_fixed)) + \
((ALIGN(sizeof(struct extent_region))) * \
(_nregions)))
struct malloc_type;
struct extent *extent_create(const char *, u_long, u_long,
struct malloc_type *, caddr_t, size_t, int);
void extent_destroy(struct extent *);
int extent_alloc_subregion1(struct extent *, u_long, u_long,
u_long, u_long, u_long, u_long, int, u_long *);
int extent_alloc_region(struct extent *, u_long, u_long, int);
int extent_free(struct extent *, u_long, u_long, int);
void extent_print(struct extent *);
/* Simple case of extent_alloc_subregion() */
#define extent_alloc(_ex, _size, _alignment, _boundary, _flags, _result) \
extent_alloc_subregion1((_ex), (_ex)->ex_start, (_ex)->ex_end, \
(_size), (_alignment), 0, (_boundary), (_flags), (_result))
#define extent_alloc1(_ex, _size, _alignment, _skew, _boundary, \
_flags, _result) \
extent_alloc_subregion1((_ex), (_ex)->ex_start, (_ex)->ex_end, \
(_size), (_alignment), (_skew), (_boundary), (_flags), (_result))
/* Compat version of extent_alloc_subregion() */
#define extent_alloc_subregion(_ex, _start, _end, _size, _alignment, \
_boundary, _flags, _result) \
extent_alloc_subregion1((_ex), (_start), (_end), \
(_size), (_alignment), 0, (_boundary), (_flags), (_result))
#endif /* _KERNEL || _EXTENT_TESTING */
#endif /* ! _SYS_EXTENT_H_ */