1 /* $NetBSD: extent.h,v 1.19 2012/01/27 18:53:10 para Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _SYS_EXTENT_H_ 33 #define _SYS_EXTENT_H_ 34 35 #include <sys/queue.h> 36 #include <sys/mutex.h> 37 #include <sys/condvar.h> 38 39 struct extent_region { 40 LIST_ENTRY(extent_region) er_link; /* link in region list */ 41 u_long er_start; /* start of region */ 42 u_long er_end; /* end of region */ 43 int er_flags; /* misc. flags */ 44 }; 45 46 /* er_flags */ 47 #define ER_ALLOC 0x01 /* region descriptor dynamically allocated */ 48 49 struct extent { 50 const char *ex_name; /* name of extent */ 51 kmutex_t ex_lock; /* lock on this extent */ 52 kcondvar_t ex_cv; /* synchronization */ 53 /* allocated regions in extent */ 54 LIST_HEAD(, extent_region) ex_regions; 55 u_long ex_start; /* start of extent */ 56 u_long ex_end; /* end of extent */ 57 int ex_flags; /* misc. information */ 58 }; 59 60 struct extent_fixed { 61 struct extent fex_extent; /* MUST BE FIRST */ 62 /* freelist of region descriptors */ 63 LIST_HEAD(, extent_region) fex_freelist; 64 void * fex_storage; /* storage space for descriptors */ 65 size_t fex_storagesize; /* size of storage space */ 66 }; 67 68 /* ex_flags; for internal use only */ 69 #define EXF_FIXED 0x01 /* extent uses fixed storage */ 70 #define EXF_NOCOALESCE 0x02 /* coalescing of regions not allowed */ 71 #define EXF_FLWANTED 0x08 /* someone asleep on freelist */ 72 73 #define EXF_BITS "\20\4FLWANTED\2NOCOALESCE\1FIXED" 74 75 /* misc. flags passed to extent functions */ 76 #define EX_NOWAIT 0x00 /* not safe to sleep */ 77 #define EX_WAITOK 0x01 /* safe to sleep */ 78 #define EX_FAST 0x02 /* take first fit in extent_alloc() */ 79 #define EX_CATCH 0x04 /* catch signals while sleeping */ 80 #define EX_NOCOALESCE 0x08 /* create a non-coalescing extent */ 81 #define EX_MALLOCOK 0x10 /* safe to call kmem_alloc() */ 82 #define EX_WAITSPACE 0x20 /* wait for space to become free */ 83 #define EX_BOUNDZERO 0x40 /* boundary lines start at 0 */ 84 85 /* 86 * Special place holders for "alignment" and "boundary" arguments, 87 * in the event the caller doesn't wish to use those features. 88 */ 89 #define EX_NOALIGN 1 /* don't do alignment */ 90 #define EX_NOBOUNDARY 0 /* don't do boundary checking */ 91 92 #if defined(_KERNEL) || defined(_EXTENT_TESTING) 93 #define EXTENT_FIXED_STORAGE_SIZE(_nregions) \ 94 (ALIGN(sizeof(struct extent_fixed)) + \ 95 ((ALIGN(sizeof(struct extent_region))) * \ 96 (_nregions))) 97 98 struct extent *extent_create(const char *, u_long, u_long, 99 void *, size_t, int); 100 void extent_destroy(struct extent *); 101 int extent_alloc_subregion1(struct extent *, u_long, u_long, 102 u_long, u_long, u_long, u_long, int, u_long *); 103 int extent_alloc_subregion(struct extent *, u_long, u_long, 104 u_long, u_long, u_long, int, u_long *); 105 int extent_alloc_region(struct extent *, u_long, u_long, int); 106 int extent_alloc1(struct extent *, u_long, u_long, u_long, u_long, int, 107 u_long *); 108 int extent_alloc(struct extent *, u_long, u_long, u_long, int, u_long *); 109 int extent_free(struct extent *, u_long, u_long, int); 110 void extent_print(struct extent *); 111 void extent_init(void); 112 113 #endif /* _KERNEL || _EXTENT_TESTING */ 114 115 #endif /* ! _SYS_EXTENT_H_ */ 116