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 35 struct xfs_buf; 36 struct xfs_mount; 37 struct xfs_perag; 38 struct xfs_trans; 39 40 /* 41 * Freespace allocation types. Argument to xfs_alloc_[v]extent. 42 */ 43 typedef 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 */ 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 */ 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 103 extern 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 */ 119 void 120 xfs_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 */ 127 int /* error */ 128 xfs_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 */ 136 void 137 xfs_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 */ 145 int /* error */ 146 xfs_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 */ 155 int /* error */ 156 xfs_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 */ 165 int /* error */ 166 xfs_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 */ 176 int /* error */ 177 xfs_alloc_vextent( 178 xfs_alloc_arg_t *args); /* allocation argument structure */ 179 180 /* 181 * Free an extent. 182 */ 183 int /* error */ 184 xfs_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 */ 188 189 void 190 xfs_alloc_mark_busy(xfs_trans_t *tp, 191 xfs_agnumber_t agno, 192 xfs_agblock_t bno, 193 xfs_extlen_t len); 194 195 void 196 xfs_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__ */ 204