FreeBSD/Linux Kernel Cross Reference
sys/sys/extent.h
1 /* $NetBSD: extent.h,v 1.18 2008/04/28 20:24:10 martin 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 struct malloc_type *ex_mtype; /* memory type */
58 int ex_flags; /* misc. information */
59 };
60
61 struct extent_fixed {
62 struct extent fex_extent; /* MUST BE FIRST */
63 /* freelist of region descriptors */
64 LIST_HEAD(, extent_region) fex_freelist;
65 void * fex_storage; /* storage space for descriptors */
66 size_t fex_storagesize; /* size of storage space */
67 };
68
69 /* ex_flags; for internal use only */
70 #define EXF_FIXED 0x01 /* extent uses fixed storage */
71 #define EXF_NOCOALESCE 0x02 /* coalescing of regions not allowed */
72 #define EXF_FLWANTED 0x08 /* someone asleep on freelist */
73
74 #define EXF_BITS "\2\4FLWANTED\2NOCOALESCE\1FIXED"
75
76 /* misc. flags passed to extent functions */
77 #define EX_NOWAIT 0x00 /* not safe to sleep */
78 #define EX_WAITOK 0x01 /* safe to sleep */
79 #define EX_FAST 0x02 /* take first fit in extent_alloc() */
80 #define EX_CATCH 0x04 /* catch signals while sleeping */
81 #define EX_NOCOALESCE 0x08 /* create a non-coalescing extent */
82 #define EX_MALLOCOK 0x10 /* safe to call malloc() */
83 #define EX_WAITSPACE 0x20 /* wait for space to become free */
84 #define EX_BOUNDZERO 0x40 /* boundary lines start at 0 */
85
86 /*
87 * Special place holders for "alignment" and "boundary" arguments,
88 * in the event the caller doesn't wish to use those features.
89 */
90 #define EX_NOALIGN 1 /* don't do alignment */
91 #define EX_NOBOUNDARY 0 /* don't do boundary checking */
92
93 #if defined(_KERNEL) || defined(_EXTENT_TESTING)
94 #define EXTENT_FIXED_STORAGE_SIZE(_nregions) \
95 (ALIGN(sizeof(struct extent_fixed)) + \
96 ((ALIGN(sizeof(struct extent_region))) * \
97 (_nregions)))
98
99 struct malloc_type;
100
101 struct extent *extent_create(const char *, u_long, u_long,
102 struct malloc_type *, void *, size_t, int);
103 void extent_destroy(struct extent *);
104 int extent_alloc_subregion1(struct extent *, u_long, u_long,
105 u_long, u_long, u_long, u_long, int, u_long *);
106 int extent_alloc_subregion(struct extent *, u_long, u_long,
107 u_long, u_long, u_long, int, u_long *);
108 int extent_alloc_region(struct extent *, u_long, u_long, int);
109 int extent_alloc1(struct extent *, u_long, u_long, u_long, u_long, int,
110 u_long *);
111 int extent_alloc(struct extent *, u_long, u_long, u_long, int, u_long *);
112 int extent_free(struct extent *, u_long, u_long, int);
113 void extent_print(struct extent *);
114 void extent_init(void);
115
116 #endif /* _KERNEL || _EXTENT_TESTING */
117
118 #endif /* ! _SYS_EXTENT_H_ */
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