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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_ALLOC_H__
19#define __XFS_ALLOC_H__
20
21struct xfs_buf;
22struct xfs_mount;
23struct xfs_perag;
24struct xfs_trans;
25
26/*
27 * Freespace allocation types. Argument to xfs_alloc_[v]extent.
28 */
29typedef 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 */
50typedef 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
89extern 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 */
105void
106xfs_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 */
113int /* error */
114xfs_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 */
122void
123xfs_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 */
131int /* error */
132xfs_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 */
141int /* error */
142xfs_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 */
151int /* error */
152xfs_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 */
162int /* error */
163xfs_alloc_vextent(
164 xfs_alloc_arg_t *args); /* allocation argument structure */
165
166/*
167 * Free an extent.
168 */
169int /* error */
170xfs_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
175void
176xfs_alloc_mark_busy(xfs_trans_t *tp,
177 xfs_agnumber_t agno,
178 xfs_agblock_t bno,
179 xfs_extlen_t len);
180
181void
182xfs_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__ */