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1 | /* | |
2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it would be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | #ifndef __XFS_ALLOC_H__ | |
19 | #define __XFS_ALLOC_H__ | |
20 | ||
21 | struct xfs_buf; | |
22 | struct xfs_mount; | |
23 | struct xfs_perag; | |
24 | struct xfs_trans; | |
25 | ||
26 | /* | |
27 | * Freespace allocation types. Argument to xfs_alloc_[v]extent. | |
28 | */ | |
29 | typedef enum xfs_alloctype | |
30 | { | |
31 | XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */ | |
32 | XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */ | |
33 | XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */ | |
34 | XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */ | |
35 | XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */ | |
36 | XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */ | |
37 | XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */ | |
38 | } xfs_alloctype_t; | |
39 | ||
40 | /* | |
41 | * Flags for xfs_alloc_fix_freelist. | |
42 | */ | |
43 | #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ | |
44 | ||
45 | /* | |
46 | * Argument structure for xfs_alloc routines. | |
47 | * This is turned into a structure to avoid having 20 arguments passed | |
48 | * down several levels of the stack. | |
49 | */ | |
50 | typedef struct xfs_alloc_arg { | |
51 | struct xfs_trans *tp; /* transaction pointer */ | |
52 | struct xfs_mount *mp; /* file system mount point */ | |
53 | struct xfs_buf *agbp; /* buffer for a.g. freelist header */ | |
54 | struct xfs_perag *pag; /* per-ag struct for this agno */ | |
55 | xfs_fsblock_t fsbno; /* file system block number */ | |
56 | xfs_agnumber_t agno; /* allocation group number */ | |
57 | xfs_agblock_t agbno; /* allocation group-relative block # */ | |
58 | xfs_extlen_t minlen; /* minimum size of extent */ | |
59 | xfs_extlen_t maxlen; /* maximum size of extent */ | |
60 | xfs_extlen_t mod; /* mod value for extent size */ | |
61 | xfs_extlen_t prod; /* prod value for extent size */ | |
62 | xfs_extlen_t minleft; /* min blocks must be left after us */ | |
63 | xfs_extlen_t total; /* total blocks needed in xaction */ | |
64 | xfs_extlen_t alignment; /* align answer to multiple of this */ | |
65 | xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ | |
66 | xfs_extlen_t len; /* output: actual size of extent */ | |
67 | xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ | |
68 | xfs_alloctype_t otype; /* original allocation type */ | |
69 | char wasdel; /* set if allocation was prev delayed */ | |
70 | char wasfromfl; /* set if allocation is from freelist */ | |
71 | char isfl; /* set if is freelist blocks - !actg */ | |
72 | char userdata; /* set if this is user data */ | |
73 | } xfs_alloc_arg_t; | |
74 | ||
75 | /* | |
76 | * Defines for userdata | |
77 | */ | |
78 | #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/ | |
79 | #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */ | |
80 | ||
81 | ||
82 | #ifdef __KERNEL__ | |
83 | ||
84 | #if defined(XFS_ALLOC_TRACE) | |
85 | /* | |
86 | * Allocation tracing buffer size. | |
87 | */ | |
88 | #define XFS_ALLOC_TRACE_SIZE 4096 | |
89 | extern ktrace_t *xfs_alloc_trace_buf; | |
90 | ||
91 | /* | |
92 | * Types for alloc tracing. | |
93 | */ | |
94 | #define XFS_ALLOC_KTRACE_ALLOC 1 | |
95 | #define XFS_ALLOC_KTRACE_FREE 2 | |
96 | #define XFS_ALLOC_KTRACE_MODAGF 3 | |
97 | #define XFS_ALLOC_KTRACE_BUSY 4 | |
98 | #define XFS_ALLOC_KTRACE_UNBUSY 5 | |
99 | #define XFS_ALLOC_KTRACE_BUSYSEARCH 6 | |
100 | #endif | |
101 | ||
102 | /* | |
103 | * Compute and fill in value of m_ag_maxlevels. | |
104 | */ | |
105 | void | |
106 | xfs_alloc_compute_maxlevels( | |
107 | struct xfs_mount *mp); /* file system mount structure */ | |
108 | ||
109 | /* | |
110 | * Get a block from the freelist. | |
111 | * Returns with the buffer for the block gotten. | |
112 | */ | |
113 | int /* error */ | |
114 | xfs_alloc_get_freelist( | |
115 | struct xfs_trans *tp, /* transaction pointer */ | |
116 | struct xfs_buf *agbp, /* buffer containing the agf structure */ | |
117 | xfs_agblock_t *bnop); /* block address retrieved from freelist */ | |
118 | ||
119 | /* | |
120 | * Log the given fields from the agf structure. | |
121 | */ | |
122 | void | |
123 | xfs_alloc_log_agf( | |
124 | struct xfs_trans *tp, /* transaction pointer */ | |
125 | struct xfs_buf *bp, /* buffer for a.g. freelist header */ | |
126 | int fields);/* mask of fields to be logged (XFS_AGF_...) */ | |
127 | ||
128 | /* | |
129 | * Interface for inode allocation to force the pag data to be initialized. | |
130 | */ | |
131 | int /* error */ | |
132 | xfs_alloc_pagf_init( | |
133 | struct xfs_mount *mp, /* file system mount structure */ | |
134 | struct xfs_trans *tp, /* transaction pointer */ | |
135 | xfs_agnumber_t agno, /* allocation group number */ | |
136 | int flags); /* XFS_ALLOC_FLAGS_... */ | |
137 | ||
138 | /* | |
139 | * Put the block on the freelist for the allocation group. | |
140 | */ | |
141 | int /* error */ | |
142 | xfs_alloc_put_freelist( | |
143 | struct xfs_trans *tp, /* transaction pointer */ | |
144 | struct xfs_buf *agbp, /* buffer for a.g. freelist header */ | |
145 | struct xfs_buf *agflbp,/* buffer for a.g. free block array */ | |
146 | xfs_agblock_t bno); /* block being freed */ | |
147 | ||
148 | /* | |
149 | * Read in the allocation group header (free/alloc section). | |
150 | */ | |
151 | int /* error */ | |
152 | xfs_alloc_read_agf( | |
153 | struct xfs_mount *mp, /* mount point structure */ | |
154 | struct xfs_trans *tp, /* transaction pointer */ | |
155 | xfs_agnumber_t agno, /* allocation group number */ | |
156 | int flags, /* XFS_ALLOC_FLAG_... */ | |
157 | struct xfs_buf **bpp); /* buffer for the ag freelist header */ | |
158 | ||
159 | /* | |
160 | * Allocate an extent (variable-size). | |
161 | */ | |
162 | int /* error */ | |
163 | xfs_alloc_vextent( | |
164 | xfs_alloc_arg_t *args); /* allocation argument structure */ | |
165 | ||
166 | /* | |
167 | * Free an extent. | |
168 | */ | |
169 | int /* error */ | |
170 | xfs_free_extent( | |
171 | struct xfs_trans *tp, /* transaction pointer */ | |
172 | xfs_fsblock_t bno, /* starting block number of extent */ | |
173 | xfs_extlen_t len); /* length of extent */ | |
174 | ||
175 | void | |
176 | xfs_alloc_mark_busy(xfs_trans_t *tp, | |
177 | xfs_agnumber_t agno, | |
178 | xfs_agblock_t bno, | |
179 | xfs_extlen_t len); | |
180 | ||
181 | void | |
182 | xfs_alloc_clear_busy(xfs_trans_t *tp, | |
183 | xfs_agnumber_t ag, | |
184 | int idx); | |
185 | ||
186 | ||
187 | #endif /* __KERNEL__ */ | |
188 | ||
189 | #endif /* __XFS_ALLOC_H__ */ |