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 int datatype; /* mask defining data type treatment */ 89 char wasdel; /* set if allocation was prev delayed */ 90 char wasfromfl; /* set if allocation is from freelist */ 91 xfs_fsblock_t firstblock; /* io first block allocated */ 92 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 93 enum xfs_ag_resv_type resv; /* block reservation to use */ 94 } xfs_alloc_arg_t; 95 96 /* 97 * Defines for datatype 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 #define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */ 103 104 static inline bool 105 xfs_alloc_is_userdata(int datatype) 106 { 107 return (datatype & ~XFS_ALLOC_NOBUSY) != 0; 108 } 109 110 static inline bool 111 xfs_alloc_allow_busy_reuse(int datatype) 112 { 113 return (datatype & XFS_ALLOC_NOBUSY) == 0; 114 } 115 116 /* freespace limit calculations */ 117 #define XFS_ALLOC_AGFL_RESERVE 4 118 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 119 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 120 121 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp, 122 struct xfs_perag *pag, xfs_extlen_t need, 123 xfs_extlen_t reserved); 124 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 125 struct xfs_perag *pag); 126 127 /* 128 * Compute and fill in value of m_ag_maxlevels. 129 */ 130 void 131 xfs_alloc_compute_maxlevels( 132 struct xfs_mount *mp); /* file system mount structure */ 133 134 /* 135 * Get a block from the freelist. 136 * Returns with the buffer for the block gotten. 137 */ 138 int /* error */ 139 xfs_alloc_get_freelist( 140 struct xfs_trans *tp, /* transaction pointer */ 141 struct xfs_buf *agbp, /* buffer containing the agf structure */ 142 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 143 int btreeblk); /* destination is a AGF btree */ 144 145 /* 146 * Log the given fields from the agf structure. 147 */ 148 void 149 xfs_alloc_log_agf( 150 struct xfs_trans *tp, /* transaction pointer */ 151 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 152 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 153 154 /* 155 * Interface for inode allocation to force the pag data to be initialized. 156 */ 157 int /* error */ 158 xfs_alloc_pagf_init( 159 struct xfs_mount *mp, /* file system mount structure */ 160 struct xfs_trans *tp, /* transaction pointer */ 161 xfs_agnumber_t agno, /* allocation group number */ 162 int flags); /* XFS_ALLOC_FLAGS_... */ 163 164 /* 165 * Put the block on the freelist for the allocation group. 166 */ 167 int /* error */ 168 xfs_alloc_put_freelist( 169 struct xfs_trans *tp, /* transaction pointer */ 170 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 171 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 172 xfs_agblock_t bno, /* block being freed */ 173 int btreeblk); /* owner was a AGF btree */ 174 175 /* 176 * Read in the allocation group header (free/alloc section). 177 */ 178 int /* error */ 179 xfs_alloc_read_agf( 180 struct xfs_mount *mp, /* mount point structure */ 181 struct xfs_trans *tp, /* transaction pointer */ 182 xfs_agnumber_t agno, /* allocation group number */ 183 int flags, /* XFS_ALLOC_FLAG_... */ 184 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 185 186 /* 187 * Allocate an extent (variable-size). 188 */ 189 int /* error */ 190 xfs_alloc_vextent( 191 xfs_alloc_arg_t *args); /* allocation argument structure */ 192 193 /* 194 * Free an extent. 195 */ 196 int /* error */ 197 xfs_free_extent( 198 struct xfs_trans *tp, /* transaction pointer */ 199 xfs_fsblock_t bno, /* starting block number of extent */ 200 xfs_extlen_t len, /* length of extent */ 201 struct xfs_owner_info *oinfo, /* extent owner */ 202 enum xfs_ag_resv_type type); /* block reservation type */ 203 204 int /* error */ 205 xfs_alloc_lookup_ge( 206 struct xfs_btree_cur *cur, /* btree cursor */ 207 xfs_agblock_t bno, /* starting block of extent */ 208 xfs_extlen_t len, /* length of extent */ 209 int *stat); /* success/failure */ 210 211 int /* error */ 212 xfs_alloc_get_rec( 213 struct xfs_btree_cur *cur, /* btree cursor */ 214 xfs_agblock_t *bno, /* output: starting block of extent */ 215 xfs_extlen_t *len, /* output: length of extent */ 216 int *stat); /* output: success/failure */ 217 218 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, 219 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); 220 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 221 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, 222 struct xfs_buf **agbp); 223 224 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 225 226 #endif /* __XFS_ALLOC_H__ */ 227