1 /* 2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * 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. 13 * 14 * 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 17 */ 18 #ifndef __XFS_ALLOC_H__ 19 #define __XFS_ALLOC_H__ 20 21 struct xfs_buf; 22 struct xfs_btree_cur; 23 struct xfs_mount; 24 struct xfs_perag; 25 struct xfs_trans; 26 27 extern struct workqueue_struct *xfs_alloc_wq; 28 29 /* 30 * Freespace allocation types. Argument to xfs_alloc_[v]extent. 31 */ 32 #define XFS_ALLOCTYPE_ANY_AG 0x01 /* allocate anywhere, use rotor */ 33 #define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */ 34 #define XFS_ALLOCTYPE_START_AG 0x04 /* anywhere, start in this a.g. */ 35 #define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */ 36 #define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */ 37 #define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */ 38 #define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */ 39 40 /* this should become an enum again when the tracing code is fixed */ 41 typedef unsigned int xfs_alloctype_t; 42 43 #define XFS_ALLOC_TYPES \ 44 { XFS_ALLOCTYPE_ANY_AG, "ANY_AG" }, \ 45 { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \ 46 { XFS_ALLOCTYPE_START_AG, "START_AG" }, \ 47 { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ 48 { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ 49 { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ 50 { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } 51 52 /* 53 * Flags for xfs_alloc_fix_freelist. 54 */ 55 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ 56 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ 57 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */ 58 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */ 59 60 61 /* 62 * Argument structure for xfs_alloc routines. 63 * This is turned into a structure to avoid having 20 arguments passed 64 * down several levels of the stack. 65 */ 66 typedef struct xfs_alloc_arg { 67 struct xfs_trans *tp; /* transaction pointer */ 68 struct xfs_mount *mp; /* file system mount point */ 69 struct xfs_buf *agbp; /* buffer for a.g. freelist header */ 70 struct xfs_perag *pag; /* per-ag struct for this agno */ 71 struct xfs_inode *ip; /* for userdata zeroing method */ 72 xfs_fsblock_t fsbno; /* file system block number */ 73 xfs_agnumber_t agno; /* allocation group number */ 74 xfs_agblock_t agbno; /* allocation group-relative block # */ 75 xfs_extlen_t minlen; /* minimum size of extent */ 76 xfs_extlen_t maxlen; /* maximum size of extent */ 77 xfs_extlen_t mod; /* mod value for extent size */ 78 xfs_extlen_t prod; /* prod value for extent size */ 79 xfs_extlen_t minleft; /* min blocks must be left after us */ 80 xfs_extlen_t total; /* total blocks needed in xaction */ 81 xfs_extlen_t alignment; /* align answer to multiple of this */ 82 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ 83 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ 84 xfs_agblock_t max_agbno; /* ... */ 85 xfs_extlen_t len; /* output: actual size of extent */ 86 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ 87 xfs_alloctype_t otype; /* original allocation type */ 88 char wasdel; /* set if allocation was prev delayed */ 89 char wasfromfl; /* set if allocation is from freelist */ 90 char isfl; /* set if is freelist blocks - !acctg */ 91 char userdata; /* mask defining userdata treatment */ 92 xfs_fsblock_t firstblock; /* io first block allocated */ 93 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 94 } xfs_alloc_arg_t; 95 96 /* 97 * Defines for userdata 98 */ 99 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 100 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 101 #define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */ 102 103 /* freespace limit calculations */ 104 #define XFS_ALLOC_AGFL_RESERVE 4 105 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 106 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 107 108 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp, 109 struct xfs_perag *pag, xfs_extlen_t need); 110 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 111 struct xfs_perag *pag); 112 113 /* 114 * Compute and fill in value of m_ag_maxlevels. 115 */ 116 void 117 xfs_alloc_compute_maxlevels( 118 struct xfs_mount *mp); /* file system mount structure */ 119 120 /* 121 * Get a block from the freelist. 122 * Returns with the buffer for the block gotten. 123 */ 124 int /* error */ 125 xfs_alloc_get_freelist( 126 struct xfs_trans *tp, /* transaction pointer */ 127 struct xfs_buf *agbp, /* buffer containing the agf structure */ 128 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 129 int btreeblk); /* destination is a AGF btree */ 130 131 /* 132 * Log the given fields from the agf structure. 133 */ 134 void 135 xfs_alloc_log_agf( 136 struct xfs_trans *tp, /* transaction pointer */ 137 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 138 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 139 140 /* 141 * Interface for inode allocation to force the pag data to be initialized. 142 */ 143 int /* error */ 144 xfs_alloc_pagf_init( 145 struct xfs_mount *mp, /* file system mount structure */ 146 struct xfs_trans *tp, /* transaction pointer */ 147 xfs_agnumber_t agno, /* allocation group number */ 148 int flags); /* XFS_ALLOC_FLAGS_... */ 149 150 /* 151 * Put the block on the freelist for the allocation group. 152 */ 153 int /* error */ 154 xfs_alloc_put_freelist( 155 struct xfs_trans *tp, /* transaction pointer */ 156 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 157 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 158 xfs_agblock_t bno, /* block being freed */ 159 int btreeblk); /* owner was a AGF btree */ 160 161 /* 162 * Read in the allocation group header (free/alloc section). 163 */ 164 int /* error */ 165 xfs_alloc_read_agf( 166 struct xfs_mount *mp, /* mount point structure */ 167 struct xfs_trans *tp, /* transaction pointer */ 168 xfs_agnumber_t agno, /* allocation group number */ 169 int flags, /* XFS_ALLOC_FLAG_... */ 170 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 171 172 /* 173 * Allocate an extent (variable-size). 174 */ 175 int /* error */ 176 xfs_alloc_vextent( 177 xfs_alloc_arg_t *args); /* allocation argument structure */ 178 179 /* 180 * Free an extent. 181 */ 182 int /* error */ 183 xfs_free_extent( 184 struct xfs_trans *tp, /* transaction pointer */ 185 xfs_fsblock_t bno, /* starting block number of extent */ 186 xfs_extlen_t len, /* length of extent */ 187 struct xfs_owner_info *oinfo);/* extent owner */ 188 189 int /* error */ 190 xfs_alloc_lookup_ge( 191 struct xfs_btree_cur *cur, /* btree cursor */ 192 xfs_agblock_t bno, /* starting block of extent */ 193 xfs_extlen_t len, /* length of extent */ 194 int *stat); /* success/failure */ 195 196 int /* error */ 197 xfs_alloc_get_rec( 198 struct xfs_btree_cur *cur, /* btree cursor */ 199 xfs_agblock_t *bno, /* output: starting block of extent */ 200 xfs_extlen_t *len, /* output: length of extent */ 201 int *stat); /* output: success/failure */ 202 203 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, 204 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); 205 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 206 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, 207 struct xfs_buf **agbp); 208 209 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 210 211 #endif /* __XFS_ALLOC_H__ */ 212