1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_ALLOC_H__ 7 #define __XFS_ALLOC_H__ 8 9 struct xfs_buf; 10 struct xfs_btree_cur; 11 struct xfs_mount; 12 struct xfs_perag; 13 struct xfs_trans; 14 15 extern struct workqueue_struct *xfs_alloc_wq; 16 17 unsigned int xfs_agfl_size(struct xfs_mount *mp); 18 19 /* 20 * Freespace allocation types. Argument to xfs_alloc_[v]extent. 21 */ 22 #define XFS_ALLOCTYPE_FIRST_AG 0x02 /* ... start at ag 0 */ 23 #define XFS_ALLOCTYPE_THIS_AG 0x08 /* anywhere in this a.g. */ 24 #define XFS_ALLOCTYPE_START_BNO 0x10 /* near this block else anywhere */ 25 #define XFS_ALLOCTYPE_NEAR_BNO 0x20 /* in this a.g. and near this block */ 26 #define XFS_ALLOCTYPE_THIS_BNO 0x40 /* at exactly this block */ 27 28 /* this should become an enum again when the tracing code is fixed */ 29 typedef unsigned int xfs_alloctype_t; 30 31 #define XFS_ALLOC_TYPES \ 32 { XFS_ALLOCTYPE_FIRST_AG, "FIRST_AG" }, \ 33 { XFS_ALLOCTYPE_THIS_AG, "THIS_AG" }, \ 34 { XFS_ALLOCTYPE_START_BNO, "START_BNO" }, \ 35 { XFS_ALLOCTYPE_NEAR_BNO, "NEAR_BNO" }, \ 36 { XFS_ALLOCTYPE_THIS_BNO, "THIS_BNO" } 37 38 /* 39 * Flags for xfs_alloc_fix_freelist. 40 */ 41 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ 42 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ 43 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */ 44 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */ 45 #define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */ 46 47 /* 48 * Argument structure for xfs_alloc routines. 49 * This is turned into a structure to avoid having 20 arguments passed 50 * down several levels of the stack. 51 */ 52 typedef struct xfs_alloc_arg { 53 struct xfs_trans *tp; /* transaction pointer */ 54 struct xfs_mount *mp; /* file system mount point */ 55 struct xfs_buf *agbp; /* buffer for a.g. freelist header */ 56 struct xfs_perag *pag; /* per-ag struct for this agno */ 57 struct xfs_inode *ip; /* for userdata zeroing method */ 58 xfs_fsblock_t fsbno; /* file system block number */ 59 xfs_agnumber_t agno; /* allocation group number */ 60 xfs_agblock_t agbno; /* allocation group-relative block # */ 61 xfs_extlen_t minlen; /* minimum size of extent */ 62 xfs_extlen_t maxlen; /* maximum size of extent */ 63 xfs_extlen_t mod; /* mod value for extent size */ 64 xfs_extlen_t prod; /* prod value for extent size */ 65 xfs_extlen_t minleft; /* min blocks must be left after us */ 66 xfs_extlen_t total; /* total blocks needed in xaction */ 67 xfs_extlen_t alignment; /* align answer to multiple of this */ 68 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ 69 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ 70 xfs_agblock_t max_agbno; /* ... */ 71 xfs_extlen_t len; /* output: actual size of extent */ 72 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ 73 xfs_alloctype_t otype; /* original allocation type */ 74 int datatype; /* mask defining data type treatment */ 75 char wasdel; /* set if allocation was prev delayed */ 76 char wasfromfl; /* set if allocation is from freelist */ 77 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 78 enum xfs_ag_resv_type resv; /* block reservation to use */ 79 } xfs_alloc_arg_t; 80 81 /* 82 * Defines for datatype 83 */ 84 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 85 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 86 #define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */ 87 #define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */ 88 89 static inline bool 90 xfs_alloc_is_userdata(int datatype) 91 { 92 return (datatype & ~XFS_ALLOC_NOBUSY) != 0; 93 } 94 95 static inline bool 96 xfs_alloc_allow_busy_reuse(int datatype) 97 { 98 return (datatype & XFS_ALLOC_NOBUSY) == 0; 99 } 100 101 /* freespace limit calculations */ 102 #define XFS_ALLOC_AGFL_RESERVE 4 103 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 104 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 105 106 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, 107 xfs_extlen_t need, xfs_extlen_t reserved); 108 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 109 struct xfs_perag *pag); 110 111 /* 112 * Compute and fill in value of m_ag_maxlevels. 113 */ 114 void 115 xfs_alloc_compute_maxlevels( 116 struct xfs_mount *mp); /* file system mount structure */ 117 118 /* 119 * Get a block from the freelist. 120 * Returns with the buffer for the block gotten. 121 */ 122 int /* error */ 123 xfs_alloc_get_freelist( 124 struct xfs_trans *tp, /* transaction pointer */ 125 struct xfs_buf *agbp, /* buffer containing the agf structure */ 126 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 127 int btreeblk); /* destination is a AGF btree */ 128 129 /* 130 * Log the given fields from the agf structure. 131 */ 132 void 133 xfs_alloc_log_agf( 134 struct xfs_trans *tp, /* transaction pointer */ 135 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 136 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 137 138 /* 139 * Interface for inode allocation to force the pag data to be initialized. 140 */ 141 int /* error */ 142 xfs_alloc_pagf_init( 143 struct xfs_mount *mp, /* file system mount structure */ 144 struct xfs_trans *tp, /* transaction pointer */ 145 xfs_agnumber_t agno, /* allocation group number */ 146 int flags); /* XFS_ALLOC_FLAGS_... */ 147 148 /* 149 * Put the block on the freelist for the allocation group. 150 */ 151 int /* error */ 152 xfs_alloc_put_freelist( 153 struct xfs_trans *tp, /* transaction pointer */ 154 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 155 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 156 xfs_agblock_t bno, /* block being freed */ 157 int btreeblk); /* owner was a AGF btree */ 158 159 /* 160 * Read in the allocation group header (free/alloc section). 161 */ 162 int /* error */ 163 xfs_alloc_read_agf( 164 struct xfs_mount *mp, /* mount point structure */ 165 struct xfs_trans *tp, /* transaction pointer */ 166 xfs_agnumber_t agno, /* allocation group number */ 167 int flags, /* XFS_ALLOC_FLAG_... */ 168 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 169 170 /* 171 * Allocate an extent (variable-size). 172 */ 173 int /* error */ 174 xfs_alloc_vextent( 175 xfs_alloc_arg_t *args); /* allocation argument structure */ 176 177 /* 178 * Free an extent. 179 */ 180 int /* error */ 181 __xfs_free_extent( 182 struct xfs_trans *tp, /* transaction pointer */ 183 xfs_fsblock_t bno, /* starting block number of extent */ 184 xfs_extlen_t len, /* length of extent */ 185 struct xfs_owner_info *oinfo, /* extent owner */ 186 enum xfs_ag_resv_type type, /* block reservation type */ 187 bool skip_discard); 188 189 static inline int 190 xfs_free_extent( 191 struct xfs_trans *tp, 192 xfs_fsblock_t bno, 193 xfs_extlen_t len, 194 struct xfs_owner_info *oinfo, 195 enum xfs_ag_resv_type type) 196 { 197 return __xfs_free_extent(tp, bno, len, oinfo, type, false); 198 } 199 200 int /* error */ 201 xfs_alloc_lookup_le( 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_lookup_ge( 209 struct xfs_btree_cur *cur, /* btree cursor */ 210 xfs_agblock_t bno, /* starting block of extent */ 211 xfs_extlen_t len, /* length of extent */ 212 int *stat); /* success/failure */ 213 214 int /* error */ 215 xfs_alloc_get_rec( 216 struct xfs_btree_cur *cur, /* btree cursor */ 217 xfs_agblock_t *bno, /* output: starting block of extent */ 218 xfs_extlen_t *len, /* output: length of extent */ 219 int *stat); /* output: success/failure */ 220 221 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, 222 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); 223 int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp, 224 xfs_agnumber_t agno, struct xfs_buf **bpp); 225 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t, 226 struct xfs_buf *, struct xfs_owner_info *); 227 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 228 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, 229 struct xfs_buf **agbp); 230 231 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 232 233 typedef int (*xfs_alloc_query_range_fn)( 234 struct xfs_btree_cur *cur, 235 struct xfs_alloc_rec_incore *rec, 236 void *priv); 237 238 int xfs_alloc_query_range(struct xfs_btree_cur *cur, 239 struct xfs_alloc_rec_incore *low_rec, 240 struct xfs_alloc_rec_incore *high_rec, 241 xfs_alloc_query_range_fn fn, void *priv); 242 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn, 243 void *priv); 244 245 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno, 246 xfs_extlen_t len, bool *exist); 247 248 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno, 249 void *priv); 250 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf, 251 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv); 252 253 #endif /* __XFS_ALLOC_H__ */ 254