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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | /* * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * Further, this software is distributed without any warranty that it is * free of the rightful claim of any third person regarding infringement * or the like. Any license provided herein, whether implied or * otherwise, applies only to this software file. Patent licenses, if * any, provided herein do not apply to combinations of this program with * other software, or any other product whatsoever. * * You should have received a copy of the GNU General Public License along * with this program; if not, write the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, * Mountain View, CA 94043, or: * * http://www.sgi.com * * For further information regarding this notice, see: * * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ */ #ifndef __XFS_ALLOC_H__ #define __XFS_ALLOC_H__ struct xfs_buf; struct xfs_mount; struct xfs_perag; struct xfs_trans; /* * Freespace allocation types. Argument to xfs_alloc_[v]extent. */ typedef enum xfs_alloctype { XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */ XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */ XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */ XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */ XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */ XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */ XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */ } xfs_alloctype_t; /* * Flags for xfs_alloc_fix_freelist. */ #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ /* * Argument structure for xfs_alloc routines. * This is turned into a structure to avoid having 20 arguments passed * down several levels of the stack. */ typedef struct xfs_alloc_arg { struct xfs_trans *tp; /* transaction pointer */ struct xfs_mount *mp; /* file system mount point */ struct xfs_buf *agbp; /* buffer for a.g. freelist header */ struct xfs_perag *pag; /* per-ag struct for this agno */ xfs_fsblock_t fsbno; /* file system block number */ xfs_agnumber_t agno; /* allocation group number */ xfs_agblock_t agbno; /* allocation group-relative block # */ xfs_extlen_t minlen; /* minimum size of extent */ xfs_extlen_t maxlen; /* maximum size of extent */ xfs_extlen_t mod; /* mod value for extent size */ xfs_extlen_t prod; /* prod value for extent size */ xfs_extlen_t minleft; /* min blocks must be left after us */ xfs_extlen_t total; /* total blocks needed in xaction */ xfs_extlen_t alignment; /* align answer to multiple of this */ xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ xfs_extlen_t len; /* output: actual size of extent */ xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ xfs_alloctype_t otype; /* original allocation type */ char wasdel; /* set if allocation was prev delayed */ char wasfromfl; /* set if allocation is from freelist */ char isfl; /* set if is freelist blocks - !actg */ char userdata; /* set if this is user data */ } xfs_alloc_arg_t; /* * Defines for userdata */ #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/ #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */ #ifdef __KERNEL__ /* * Types for alloc tracing. */ #define XFS_ALLOC_KTRACE_ALLOC 1 #define XFS_ALLOC_KTRACE_FREE 2 #define XFS_ALLOC_KTRACE_MODAGF 3 #define XFS_ALLOC_KTRACE_BUSY 4 #define XFS_ALLOC_KTRACE_UNBUSY 5 #define XFS_ALLOC_KTRACE_BUSYSEARCH 6 /* * Allocation tracing buffer size. */ #define XFS_ALLOC_TRACE_SIZE 4096 #ifdef XFS_ALL_TRACE #define XFS_ALLOC_TRACE #endif #if !defined(DEBUG) #undef XFS_ALLOC_TRACE #endif /* * Prototypes for visible xfs_alloc.c routines */ /* * Compute and fill in value of m_ag_maxlevels. */ void xfs_alloc_compute_maxlevels( struct xfs_mount *mp); /* file system mount structure */ /* * Get a block from the freelist. * Returns with the buffer for the block gotten. */ int /* error */ xfs_alloc_get_freelist( struct xfs_trans *tp, /* transaction pointer */ struct xfs_buf *agbp, /* buffer containing the agf structure */ xfs_agblock_t *bnop); /* block address retrieved from freelist */ /* * Log the given fields from the agf structure. */ void xfs_alloc_log_agf( struct xfs_trans *tp, /* transaction pointer */ struct xfs_buf *bp, /* buffer for a.g. freelist header */ int fields);/* mask of fields to be logged (XFS_AGF_...) */ /* * Interface for inode allocation to force the pag data to be initialized. */ int /* error */ xfs_alloc_pagf_init( struct xfs_mount *mp, /* file system mount structure */ struct xfs_trans *tp, /* transaction pointer */ xfs_agnumber_t agno, /* allocation group number */ int flags); /* XFS_ALLOC_FLAGS_... */ /* * Put the block on the freelist for the allocation group. */ int /* error */ xfs_alloc_put_freelist( struct xfs_trans *tp, /* transaction pointer */ struct xfs_buf *agbp, /* buffer for a.g. freelist header */ struct xfs_buf *agflbp,/* buffer for a.g. free block array */ xfs_agblock_t bno); /* block being freed */ /* * Read in the allocation group header (free/alloc section). */ int /* error */ xfs_alloc_read_agf( struct xfs_mount *mp, /* mount point structure */ struct xfs_trans *tp, /* transaction pointer */ xfs_agnumber_t agno, /* allocation group number */ int flags, /* XFS_ALLOC_FLAG_... */ struct xfs_buf **bpp); /* buffer for the ag freelist header */ /* * Allocate an extent (variable-size). */ int /* error */ xfs_alloc_vextent( xfs_alloc_arg_t *args); /* allocation argument structure */ /* * Free an extent. */ int /* error */ xfs_free_extent( struct xfs_trans *tp, /* transaction pointer */ xfs_fsblock_t bno, /* starting block number of extent */ xfs_extlen_t len); /* length of extent */ void xfs_alloc_mark_busy(xfs_trans_t *tp, xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len); void xfs_alloc_clear_busy(xfs_trans_t *tp, xfs_agnumber_t ag, int idx); #endif /* __KERNEL__ */ #endif /* __XFS_ALLOC_H__ */ |