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 | |