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_INITIAL_USER_DATA (1 << 0)/* special case start of file */ 85 #define XFS_ALLOC_USERDATA_ZERO (1 << 1)/* zero extent on allocation */ 86 #define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */ 87 88 static inline bool 89 xfs_alloc_is_userdata(int datatype) 90 { 91 return (datatype & ~XFS_ALLOC_NOBUSY) != 0; 92 } 93 94 static inline bool 95 xfs_alloc_allow_busy_reuse(int datatype) 96 { 97 return (datatype & XFS_ALLOC_NOBUSY) == 0; 98 } 99 100 /* freespace limit calculations */ 101 #define XFS_ALLOC_AGFL_RESERVE 4 102 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 103 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 104 105 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, 106 xfs_extlen_t need, xfs_extlen_t reserved); 107 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 108 struct xfs_perag *pag); 109 110 /* 111 * Compute and fill in value of m_ag_maxlevels. 112 */ 113 void 114 xfs_alloc_compute_maxlevels( 115 struct xfs_mount *mp); /* file system mount structure */ 116 117 /* 118 * Get a block from the freelist. 119 * Returns with the buffer for the block gotten. 120 */ 121 int /* error */ 122 xfs_alloc_get_freelist( 123 struct xfs_trans *tp, /* transaction pointer */ 124 struct xfs_buf *agbp, /* buffer containing the agf structure */ 125 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 126 int btreeblk); /* destination is a AGF btree */ 127 128 /* 129 * Log the given fields from the agf structure. 130 */ 131 void 132 xfs_alloc_log_agf( 133 struct xfs_trans *tp, /* transaction pointer */ 134 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 135 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 136 137 /* 138 * Interface for inode allocation to force the pag data to be initialized. 139 */ 140 int /* error */ 141 xfs_alloc_pagf_init( 142 struct xfs_mount *mp, /* file system mount structure */ 143 struct xfs_trans *tp, /* transaction pointer */ 144 xfs_agnumber_t agno, /* allocation group number */ 145 int flags); /* XFS_ALLOC_FLAGS_... */ 146 147 /* 148 * Put the block on the freelist for the allocation group. 149 */ 150 int /* error */ 151 xfs_alloc_put_freelist( 152 struct xfs_trans *tp, /* transaction pointer */ 153 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 154 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 155 xfs_agblock_t bno, /* block being freed */ 156 int btreeblk); /* owner was a AGF btree */ 157 158 /* 159 * Read in the allocation group header (free/alloc section). 160 */ 161 int /* error */ 162 xfs_alloc_read_agf( 163 struct xfs_mount *mp, /* mount point structure */ 164 struct xfs_trans *tp, /* transaction pointer */ 165 xfs_agnumber_t agno, /* allocation group number */ 166 int flags, /* XFS_ALLOC_FLAG_... */ 167 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 168 169 /* 170 * Allocate an extent (variable-size). 171 */ 172 int /* error */ 173 xfs_alloc_vextent( 174 xfs_alloc_arg_t *args); /* allocation argument structure */ 175 176 /* 177 * Free an extent. 178 */ 179 int /* error */ 180 __xfs_free_extent( 181 struct xfs_trans *tp, /* transaction pointer */ 182 xfs_fsblock_t bno, /* starting block number of extent */ 183 xfs_extlen_t len, /* length of extent */ 184 const struct xfs_owner_info *oinfo, /* extent owner */ 185 enum xfs_ag_resv_type type, /* block reservation type */ 186 bool skip_discard); 187 188 static inline int 189 xfs_free_extent( 190 struct xfs_trans *tp, 191 xfs_fsblock_t bno, 192 xfs_extlen_t len, 193 const struct xfs_owner_info *oinfo, 194 enum xfs_ag_resv_type type) 195 { 196 return __xfs_free_extent(tp, bno, len, oinfo, type, false); 197 } 198 199 int /* error */ 200 xfs_alloc_lookup_le( 201 struct xfs_btree_cur *cur, /* btree cursor */ 202 xfs_agblock_t bno, /* starting block of extent */ 203 xfs_extlen_t len, /* length of extent */ 204 int *stat); /* success/failure */ 205 206 int /* error */ 207 xfs_alloc_lookup_ge( 208 struct xfs_btree_cur *cur, /* btree cursor */ 209 xfs_agblock_t bno, /* starting block of extent */ 210 xfs_extlen_t len, /* length of extent */ 211 int *stat); /* success/failure */ 212 213 int /* error */ 214 xfs_alloc_get_rec( 215 struct xfs_btree_cur *cur, /* btree cursor */ 216 xfs_agblock_t *bno, /* output: starting block of extent */ 217 xfs_extlen_t *len, /* output: length of extent */ 218 int *stat); /* output: success/failure */ 219 220 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, 221 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); 222 int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp, 223 xfs_agnumber_t agno, struct xfs_buf **bpp); 224 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t, 225 struct xfs_buf *, struct xfs_owner_info *); 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); 243 244 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno, 245 xfs_extlen_t len, bool *exist); 246 247 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno, 248 void *priv); 249 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf, 250 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv); 251 252 #endif /* __XFS_ALLOC_H__ */ 253