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/* $NetBSD: extent.h,v 1.26 2017/08/24 11:33:28 jmcneill 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.
*
* 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/queue.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#ifndef _KERNEL
#include <stdbool.h>
#endif
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 */
kmutex_t ex_lock; /* lock on this extent */
kcondvar_t ex_cv; /* synchronization */
/* allocated regions in extent */
LIST_HEAD(, extent_region) ex_regions;
u_long ex_start; /* start of extent */
u_long ex_end; /* end of extent */
int ex_flags; /* misc. information */
bool ex_flwanted; /* someone asleep on freelist */
};
struct extent_fixed {
struct extent fex_extent; /* MUST BE FIRST */
/* freelist of region descriptors */
LIST_HEAD(, extent_region) fex_freelist;
void * fex_storage; /* storage space for descriptors */
size_t fex_storagesize; /* size of storage space */
};
/* ex_flags; for internal use only */
#define EXF_FIXED __BIT(0) /* extent uses fixed storage */
#define EXF_NOCOALESCE __BIT(1) /* coalescing of regions not allowed */
#define EXF_EARLY __BIT(2) /* no need to lock */
#define EXF_BITS "\20\3EARLY\2NOCOALESCE\1FIXED"
/* misc. flags passed to extent functions */
#define EX_NOWAIT 0 /* not safe to sleep */
#define EX_WAITOK __BIT(0) /* safe to sleep */
#define EX_FAST __BIT(1) /* take first fit in extent_alloc() */
#define EX_CATCH __BIT(2) /* catch signals while sleeping */
#define EX_NOCOALESCE __BIT(3) /* create a non-coalescing extent */
#define EX_MALLOCOK __BIT(4) /* safe to call kmem_alloc() */
#define EX_WAITSPACE __BIT(5) /* wait for space to become free */
#define EX_BOUNDZERO __BIT(6) /* boundary lines start at 0 */
#define EX_EARLY __BIT(7) /* safe for early kernel bootstrap */
/*
* 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 extent *extent_create(const char *, u_long, u_long,
void *, 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_subregion(struct extent *, 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_alloc1(struct extent *, u_long, u_long, u_long, u_long, int,
u_long *);
int extent_alloc(struct extent *, u_long, u_long, u_long, int, u_long *);
int extent_free(struct extent *, u_long, u_long, int);
void extent_print(struct extent *);
void extent_init(void);
#endif /* _KERNEL || _EXTENT_TESTING */
#endif /* ! _SYS_EXTENT_H_ */
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