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 unsigned int xfs_agfl_size(struct xfs_mount *mp); 30 31 /* 32 * Freespace allocation types. Argument to xfs_alloc_[v]extent. 33 */ 34 #define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */ 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_FIRST_AG, "FIRST_AG" }, \ 45 { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ 46 { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ 47 { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ 48 { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } 49 50 /* 51 * Flags for xfs_alloc_fix_freelist. 52 */ 53 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ 54 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ 55 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */ 56 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */ 57 #define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */ 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 struct xfs_inode *ip; /* for userdata zeroing method */ 70 xfs_fsblock_t fsbno; /* file system block number */ 71 xfs_agnumber_t agno; /* allocation group number */ 72 xfs_agblock_t agbno; /* allocation group-relative block # */ 73 xfs_extlen_t minlen; /* minimum size of extent */ 74 xfs_extlen_t maxlen; /* maximum size of extent */ 75 xfs_extlen_t mod; /* mod value for extent size */ 76 xfs_extlen_t prod; /* prod value for extent size */ 77 xfs_extlen_t minleft; /* min blocks must be left after us */ 78 xfs_extlen_t total; /* total blocks needed in xaction */ 79 xfs_extlen_t alignment; /* align answer to multiple of this */ 80 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ 81 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ 82 xfs_agblock_t max_agbno; /* ... */ 83 xfs_extlen_t len; /* output: actual size of extent */ 84 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ 85 xfs_alloctype_t otype; /* original allocation type */ 86 int datatype; /* mask defining data type treatment */ 87 char wasdel; /* set if allocation was prev delayed */ 88 char wasfromfl; /* set if allocation is from freelist */ 89 xfs_fsblock_t firstblock; /* io first block allocated */ 90 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 91 enum xfs_ag_resv_type resv; /* block reservation to use */ 92 } xfs_alloc_arg_t; 93 94 /* 95 * Defines for datatype 96 */ 97 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 98 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 99 #define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */ 100 #define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */ 101 102 static inline bool 103 xfs_alloc_is_userdata(int datatype) 104 { 105 return (datatype & ~XFS_ALLOC_NOBUSY) != 0; 106 } 107 108 static inline bool 109 xfs_alloc_allow_busy_reuse(int datatype) 110 { 111 return (datatype & XFS_ALLOC_NOBUSY) == 0; 112 } 113 114 /* freespace limit calculations */ 115 #define XFS_ALLOC_AGFL_RESERVE 4 116 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 117 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 118 119 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, 120 xfs_extlen_t need, xfs_extlen_t reserved); 121 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 122 struct xfs_perag *pag); 123 124 /* 125 * Compute and fill in value of m_ag_maxlevels. 126 */ 127 void 128 xfs_alloc_compute_maxlevels( 129 struct xfs_mount *mp); /* file system mount structure */ 130 131 /* 132 * Get a block from the freelist. 133 * Returns with the buffer for the block gotten. 134 */ 135 int /* error */ 136 xfs_alloc_get_freelist( 137 struct xfs_trans *tp, /* transaction pointer */ 138 struct xfs_buf *agbp, /* buffer containing the agf structure */ 139 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 140 int btreeblk); /* destination is a AGF btree */ 141 142 /* 143 * Log the given fields from the agf structure. 144 */ 145 void 146 xfs_alloc_log_agf( 147 struct xfs_trans *tp, /* transaction pointer */ 148 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 149 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 150 151 /* 152 * Interface for inode allocation to force the pag data to be initialized. 153 */ 154 int /* error */ 155 xfs_alloc_pagf_init( 156 struct xfs_mount *mp, /* file system mount structure */ 157 struct xfs_trans *tp, /* transaction pointer */ 158 xfs_agnumber_t agno, /* allocation group number */ 159 int flags); /* XFS_ALLOC_FLAGS_... */ 160 161 /* 162 * Put the block on the freelist for the allocation group. 163 */ 164 int /* error */ 165 xfs_alloc_put_freelist( 166 struct xfs_trans *tp, /* transaction pointer */ 167 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 168 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 169 xfs_agblock_t bno, /* block being freed */ 170 int btreeblk); /* owner was a AGF btree */ 171 172 /* 173 * Read in the allocation group header (free/alloc section). 174 */ 175 int /* error */ 176 xfs_alloc_read_agf( 177 struct xfs_mount *mp, /* mount point structure */ 178 struct xfs_trans *tp, /* transaction pointer */ 179 xfs_agnumber_t agno, /* allocation group number */ 180 int flags, /* XFS_ALLOC_FLAG_... */ 181 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 182 183 /* 184 * Allocate an extent (variable-size). 185 */ 186 int /* error */ 187 xfs_alloc_vextent( 188 xfs_alloc_arg_t *args); /* allocation argument structure */ 189 190 /* 191 * Free an extent. 192 */ 193 int /* error */ 194 xfs_free_extent( 195 struct xfs_trans *tp, /* transaction pointer */ 196 xfs_fsblock_t bno, /* starting block number of extent */ 197 xfs_extlen_t len, /* length of extent */ 198 struct xfs_owner_info *oinfo, /* extent owner */ 199 enum xfs_ag_resv_type type); /* block reservation type */ 200 201 int /* error */ 202 xfs_alloc_lookup_le( 203 struct xfs_btree_cur *cur, /* btree cursor */ 204 xfs_agblock_t bno, /* starting block of extent */ 205 xfs_extlen_t len, /* length of extent */ 206 int *stat); /* success/failure */ 207 208 int /* error */ 209 xfs_alloc_lookup_ge( 210 struct xfs_btree_cur *cur, /* btree cursor */ 211 xfs_agblock_t bno, /* starting block of extent */ 212 xfs_extlen_t len, /* length of extent */ 213 int *stat); /* success/failure */ 214 215 int /* error */ 216 xfs_alloc_get_rec( 217 struct xfs_btree_cur *cur, /* btree cursor */ 218 xfs_agblock_t *bno, /* output: starting block of extent */ 219 xfs_extlen_t *len, /* output: length of extent */ 220 int *stat); /* output: success/failure */ 221 222 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, 223 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); 224 int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp, 225 xfs_agnumber_t agno, struct xfs_buf **bpp); 226 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 227 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, 228 struct xfs_buf **agbp); 229 230 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 231 232 typedef int (*xfs_alloc_query_range_fn)( 233 struct xfs_btree_cur *cur, 234 struct xfs_alloc_rec_incore *rec, 235 void *priv); 236 237 int xfs_alloc_query_range(struct xfs_btree_cur *cur, 238 struct xfs_alloc_rec_incore *low_rec, 239 struct xfs_alloc_rec_incore *high_rec, 240 xfs_alloc_query_range_fn fn, void *priv); 241 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn, 242 void *priv); 243 xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno); 244 bool xfs_verify_agbno(struct xfs_mount *mp, xfs_agnumber_t agno, 245 xfs_agblock_t agbno); 246 bool xfs_verify_fsbno(struct xfs_mount *mp, xfs_fsblock_t fsbno); 247 248 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno, 249 xfs_extlen_t len, bool *exist); 250 251 #endif /* __XFS_ALLOC_H__ */ 252