aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_alloc.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/xfs_alloc.h')
-rw-r--r--fs/xfs/xfs_alloc.h203
1 files changed, 203 insertions, 0 deletions
diff --git a/fs/xfs/xfs_alloc.h b/fs/xfs/xfs_alloc.h
new file mode 100644
index 000000000000..72329c86351c
--- /dev/null
+++ b/fs/xfs/xfs_alloc.h
@@ -0,0 +1,203 @@
1/*
2 * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32#ifndef __XFS_ALLOC_H__
33#define __XFS_ALLOC_H__
34
35struct xfs_buf;
36struct xfs_mount;
37struct xfs_perag;
38struct xfs_trans;
39
40/*
41 * Freespace allocation types. Argument to xfs_alloc_[v]extent.
42 */
43typedef enum xfs_alloctype
44{
45 XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */
46 XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */
47 XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */
48 XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */
49 XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */
50 XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */
51 XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */
52} xfs_alloctype_t;
53
54/*
55 * Flags for xfs_alloc_fix_freelist.
56 */
57#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
58
59/*
60 * Argument structure for xfs_alloc routines.
61 * This is turned into a structure to avoid having 20 arguments passed
62 * down several levels of the stack.
63 */
64typedef struct xfs_alloc_arg {
65 struct xfs_trans *tp; /* transaction pointer */
66 struct xfs_mount *mp; /* file system mount point */
67 struct xfs_buf *agbp; /* buffer for a.g. freelist header */
68 struct xfs_perag *pag; /* per-ag struct for this agno */
69 xfs_fsblock_t fsbno; /* file system block number */
70 xfs_agnumber_t agno; /* allocation group number */
71 xfs_agblock_t agbno; /* allocation group-relative block # */
72 xfs_extlen_t minlen; /* minimum size of extent */
73 xfs_extlen_t maxlen; /* maximum size of extent */
74 xfs_extlen_t mod; /* mod value for extent size */
75 xfs_extlen_t prod; /* prod value for extent size */
76 xfs_extlen_t minleft; /* min blocks must be left after us */
77 xfs_extlen_t total; /* total blocks needed in xaction */
78 xfs_extlen_t alignment; /* align answer to multiple of this */
79 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
80 xfs_extlen_t len; /* output: actual size of extent */
81 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */
82 xfs_alloctype_t otype; /* original allocation type */
83 char wasdel; /* set if allocation was prev delayed */
84 char wasfromfl; /* set if allocation is from freelist */
85 char isfl; /* set if is freelist blocks - !actg */
86 char userdata; /* set if this is user data */
87} xfs_alloc_arg_t;
88
89/*
90 * Defines for userdata
91 */
92#define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/
93#define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */
94
95
96#ifdef __KERNEL__
97
98#if defined(XFS_ALLOC_TRACE)
99/*
100 * Allocation tracing buffer size.
101 */
102#define XFS_ALLOC_TRACE_SIZE 4096
103extern ktrace_t *xfs_alloc_trace_buf;
104
105/*
106 * Types for alloc tracing.
107 */
108#define XFS_ALLOC_KTRACE_ALLOC 1
109#define XFS_ALLOC_KTRACE_FREE 2
110#define XFS_ALLOC_KTRACE_MODAGF 3
111#define XFS_ALLOC_KTRACE_BUSY 4
112#define XFS_ALLOC_KTRACE_UNBUSY 5
113#define XFS_ALLOC_KTRACE_BUSYSEARCH 6
114#endif
115
116/*
117 * Compute and fill in value of m_ag_maxlevels.
118 */
119void
120xfs_alloc_compute_maxlevels(
121 struct xfs_mount *mp); /* file system mount structure */
122
123/*
124 * Get a block from the freelist.
125 * Returns with the buffer for the block gotten.
126 */
127int /* error */
128xfs_alloc_get_freelist(
129 struct xfs_trans *tp, /* transaction pointer */
130 struct xfs_buf *agbp, /* buffer containing the agf structure */
131 xfs_agblock_t *bnop); /* block address retrieved from freelist */
132
133/*
134 * Log the given fields from the agf structure.
135 */
136void
137xfs_alloc_log_agf(
138 struct xfs_trans *tp, /* transaction pointer */
139 struct xfs_buf *bp, /* buffer for a.g. freelist header */
140 int fields);/* mask of fields to be logged (XFS_AGF_...) */
141
142/*
143 * Interface for inode allocation to force the pag data to be initialized.
144 */
145int /* error */
146xfs_alloc_pagf_init(
147 struct xfs_mount *mp, /* file system mount structure */
148 struct xfs_trans *tp, /* transaction pointer */
149 xfs_agnumber_t agno, /* allocation group number */
150 int flags); /* XFS_ALLOC_FLAGS_... */
151
152/*
153 * Put the block on the freelist for the allocation group.
154 */
155int /* error */
156xfs_alloc_put_freelist(
157 struct xfs_trans *tp, /* transaction pointer */
158 struct xfs_buf *agbp, /* buffer for a.g. freelist header */
159 struct xfs_buf *agflbp,/* buffer for a.g. free block array */
160 xfs_agblock_t bno); /* block being freed */
161
162/*
163 * Read in the allocation group header (free/alloc section).
164 */
165int /* error */
166xfs_alloc_read_agf(
167 struct xfs_mount *mp, /* mount point structure */
168 struct xfs_trans *tp, /* transaction pointer */
169 xfs_agnumber_t agno, /* allocation group number */
170 int flags, /* XFS_ALLOC_FLAG_... */
171 struct xfs_buf **bpp); /* buffer for the ag freelist header */
172
173/*
174 * Allocate an extent (variable-size).
175 */
176int /* error */
177xfs_alloc_vextent(
178 xfs_alloc_arg_t *args); /* allocation argument structure */
179
180/*
181 * Free an extent.
182 */
183int /* error */
184xfs_free_extent(
185 struct xfs_trans *tp, /* transaction pointer */
186 xfs_fsblock_t bno, /* starting block number of extent */
187 xfs_extlen_t len); /* length of extent */
188
189void
190xfs_alloc_mark_busy(xfs_trans_t *tp,
191 xfs_agnumber_t agno,
192 xfs_agblock_t bno,
193 xfs_extlen_t len);
194
195void
196xfs_alloc_clear_busy(xfs_trans_t *tp,
197 xfs_agnumber_t ag,
198 int idx);
199
200
201#endif /* __KERNEL__ */
202
203#endif /* __XFS_ALLOC_H__ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 05:17:09 -0500