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_FIRST_AG 0x02 /* ... start at ag 0 */ 33 #define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */ 34 #define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */ 35 #define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */ 36 #define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */ 37 38 /* this should become an enum again when the tracing code is fixed */ 39 typedef unsigned int xfs_alloctype_t; 40 41 #define XFS_ALLOC_TYPES \ 42 { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \ 43 { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ 44 { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ 45 { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ 46 { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } 47 48 /* 49 * Flags for xfs_alloc_fix_freelist. 50 */ 51 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ 52 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ 53 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */ 54 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */ 55 #define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */ 56 57 /* 58 * Argument structure for xfs_alloc routines. 59 * This is turned into a structure to avoid having 20 arguments passed 60 * down several levels of the stack. 61 */ 62 typedef struct xfs_alloc_arg { 63 struct xfs_trans *tp; /* transaction pointer */ 64 struct xfs_mount *mp; /* file system mount point */ 65 struct xfs_buf *agbp; /* buffer for a.g. freelist header */ 66 struct xfs_perag *pag; /* per-ag struct for this agno */ 67 struct xfs_inode *ip; /* for userdata zeroing method */ 68 xfs_fsblock_t fsbno; /* file system block number */ 69 xfs_agnumber_t agno; /* allocation group number */ 70 xfs_agblock_t agbno; /* allocation group-relative block # */ 71 xfs_extlen_t minlen; /* minimum size of extent */ 72 xfs_extlen_t maxlen; /* maximum size of extent */ 73 xfs_extlen_t mod; /* mod value for extent size */ 74 xfs_extlen_t prod; /* prod value for extent size */ 75 xfs_extlen_t minleft; /* min blocks must be left after us */ 76 xfs_extlen_t total; /* total blocks needed in xaction */ 77 xfs_extlen_t alignment; /* align answer to multiple of this */ 78 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ 79 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ 80 xfs_agblock_t max_agbno; /* ... */ 81 xfs_extlen_t len; /* output: actual size of extent */ 82 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ 83 xfs_alloctype_t otype; /* original allocation type */ 84 int datatype; /* mask defining data type treatment */ 85 char wasdel; /* set if allocation was prev delayed */ 86 char wasfromfl; /* set if allocation is from freelist */ 87 xfs_fsblock_t firstblock; /* io first block allocated */ 88 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 89 enum xfs_ag_resv_type resv; /* block reservation to use */ 90 } xfs_alloc_arg_t; 91 92 /* 93 * Defines for datatype 94 */ 95 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 96 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 97 #define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */ 98 #define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */ 99 100 static inline bool 101 xfs_alloc_is_userdata(int datatype) 102 { 103 return (datatype & ~XFS_ALLOC_NOBUSY) != 0; 104 } 105 106 static inline bool 107 xfs_alloc_allow_busy_reuse(int datatype) 108 { 109 return (datatype & XFS_ALLOC_NOBUSY) == 0; 110 } 111 112 /* freespace limit calculations */ 113 #define XFS_ALLOC_AGFL_RESERVE 4 114 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 115 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 116 117 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_mount *mp, 118 struct xfs_perag *pag, xfs_extlen_t need, 119 xfs_extlen_t reserved); 120 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 121 struct xfs_perag *pag); 122 123 /* 124 * Compute and fill in value of m_ag_maxlevels. 125 */ 126 void 127 xfs_alloc_compute_maxlevels( 128 struct xfs_mount *mp); /* file system mount structure */ 129 130 /* 131 * Get a block from the freelist. 132 * Returns with the buffer for the block gotten. 133 */ 134 int /* error */ 135 xfs_alloc_get_freelist( 136 struct xfs_trans *tp, /* transaction pointer */ 137 struct xfs_buf *agbp, /* buffer containing the agf structure */ 138 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 139 int btreeblk); /* destination is a AGF btree */ 140 141 /* 142 * Log the given fields from the agf structure. 143 */ 144 void 145 xfs_alloc_log_agf( 146 struct xfs_trans *tp, /* transaction pointer */ 147 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 148 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 149 150 /* 151 * Interface for inode allocation to force the pag data to be initialized. 152 */ 153 int /* error */ 154 xfs_alloc_pagf_init( 155 struct xfs_mount *mp, /* file system mount structure */ 156 struct xfs_trans *tp, /* transaction pointer */ 157 xfs_agnumber_t agno, /* allocation group number */ 158 int flags); /* XFS_ALLOC_FLAGS_... */ 159 160 /* 161 * Put the block on the freelist for the allocation group. 162 */ 163 int /* error */ 164 xfs_alloc_put_freelist( 165 struct xfs_trans *tp, /* transaction pointer */ 166 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 167 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 168 xfs_agblock_t bno, /* block being freed */ 169 int btreeblk); /* owner was a AGF btree */ 170 171 /* 172 * Read in the allocation group header (free/alloc section). 173 */ 174 int /* error */ 175 xfs_alloc_read_agf( 176 struct xfs_mount *mp, /* mount point structure */ 177 struct xfs_trans *tp, /* transaction pointer */ 178 xfs_agnumber_t agno, /* allocation group number */ 179 int flags, /* XFS_ALLOC_FLAG_... */ 180 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 181 182 /* 183 * Allocate an extent (variable-size). 184 */ 185 int /* error */ 186 xfs_alloc_vextent( 187 xfs_alloc_arg_t *args); /* allocation argument structure */ 188 189 /* 190 * Free an extent. 191 */ 192 int /* error */ 193 xfs_free_extent( 194 struct xfs_trans *tp, /* transaction pointer */ 195 xfs_fsblock_t bno, /* starting block number of extent */ 196 xfs_extlen_t len, /* length of extent */ 197 struct xfs_owner_info *oinfo, /* extent owner */ 198 enum xfs_ag_resv_type type); /* block reservation type */ 199 200 int /* error */ 201 xfs_alloc_lookup_ge( 202 struct xfs_btree_cur *cur, /* btree cursor */ 203 xfs_agblock_t bno, /* starting block of extent */ 204 xfs_extlen_t len, /* length of extent */ 205 int *stat); /* success/failure */ 206 207 int /* error */ 208 xfs_alloc_get_rec( 209 struct xfs_btree_cur *cur, /* btree cursor */ 210 xfs_agblock_t *bno, /* output: starting block of extent */ 211 xfs_extlen_t *len, /* output: length of extent */ 212 int *stat); /* output: success/failure */ 213 214 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, 215 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); 216 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 217 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, 218 struct xfs_buf **agbp); 219 220 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 221 222 #endif /* __XFS_ALLOC_H__ */ 223