2 * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
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.
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.
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.
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.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
32 #ifndef __XFS_ALLOC_H__
33 #define __XFS_ALLOC_H__
41 * Freespace allocation types. Argument to xfs_alloc_[v]extent.
43 typedef enum xfs_alloctype
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 */
55 * Flags for xfs_alloc_fix_freelist.
57 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
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.
64 typedef 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 */
90 * Defines for userdata
92 #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/
93 #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */
99 * Types for alloc tracing.
101 #define XFS_ALLOC_KTRACE_ALLOC 1
102 #define XFS_ALLOC_KTRACE_FREE 2
103 #define XFS_ALLOC_KTRACE_MODAGF 3
104 #define XFS_ALLOC_KTRACE_BUSY 4
105 #define XFS_ALLOC_KTRACE_UNBUSY 5
106 #define XFS_ALLOC_KTRACE_BUSYSEARCH 6
110 * Allocation tracing buffer size.
112 #define XFS_ALLOC_TRACE_SIZE 4096
115 #define XFS_ALLOC_TRACE
119 #undef XFS_ALLOC_TRACE
123 * Prototypes for visible xfs_alloc.c routines
127 * Compute and fill in value of m_ag_maxlevels.
130 xfs_alloc_compute_maxlevels(
131 struct xfs_mount
*mp
); /* file system mount structure */
134 * Decide whether to use this allocation group for this allocation.
135 * If so, fix up the btree freelist's size.
136 * This is external so mkfs can call it, too.
139 xfs_alloc_fix_freelist(
140 xfs_alloc_arg_t
*args
, /* allocation argument structure */
141 int flags
); /* XFS_ALLOC_FLAG_... */
144 * Get a block from the freelist.
145 * Returns with the buffer for the block gotten.
148 xfs_alloc_get_freelist(
149 struct xfs_trans
*tp
, /* transaction pointer */
150 struct xfs_buf
*agbp
, /* buffer containing the agf structure */
151 xfs_agblock_t
*bnop
); /* block address retrieved from freelist */
154 * Log the given fields from the agf structure.
158 struct xfs_trans
*tp
, /* transaction pointer */
159 struct xfs_buf
*bp
, /* buffer for a.g. freelist header */
160 int fields
);/* mask of fields to be logged (XFS_AGF_...) */
163 * Interface for inode allocation to force the pag data to be initialized.
167 struct xfs_mount
*mp
, /* file system mount structure */
168 struct xfs_trans
*tp
, /* transaction pointer */
169 xfs_agnumber_t agno
, /* allocation group number */
170 int flags
); /* XFS_ALLOC_FLAGS_... */
173 * Put the block on the freelist for the allocation group.
176 xfs_alloc_put_freelist(
177 struct xfs_trans
*tp
, /* transaction pointer */
178 struct xfs_buf
*agbp
, /* buffer for a.g. freelist header */
179 struct xfs_buf
*agflbp
,/* buffer for a.g. free block array */
180 xfs_agblock_t bno
); /* block being freed */
183 * Read in the allocation group header (free/alloc section).
187 struct xfs_mount
*mp
, /* mount point structure */
188 struct xfs_trans
*tp
, /* transaction pointer */
189 xfs_agnumber_t agno
, /* allocation group number */
190 int flags
, /* XFS_ALLOC_FLAG_... */
191 struct xfs_buf
**bpp
); /* buffer for the ag freelist header */
194 * Allocate an extent (variable-size).
198 xfs_alloc_arg_t
*args
); /* allocation argument structure */
205 struct xfs_trans
*tp
, /* transaction pointer */
206 xfs_fsblock_t bno
, /* starting block number of extent */
207 xfs_extlen_t len
); /* length of extent */
210 xfs_alloc_mark_busy(xfs_trans_t
*tp
,
216 xfs_alloc_clear_busy(xfs_trans_t
*tp
,
221 #endif /* __KERNEL__ */
223 #endif /* __XFS_ALLOC_H__ */