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 xfs_fsblock_t firstblock; /* io first block allocated */ 78 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 79 enum xfs_ag_resv_type resv; /* block reservation to use */ 80 } xfs_alloc_arg_t; 81 82 /* 83 * Defines for datatype 84 */ 85 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 86 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 87 #define XFS_ALLOC_USERDATA_ZERO (1 << 2)/* zero extent on allocation */ 88 #define XFS_ALLOC_NOBUSY (1 << 3)/* Busy extents not allowed */ 89 90 static inline bool 91 xfs_alloc_is_userdata(int datatype) 92 { 93 return (datatype & ~XFS_ALLOC_NOBUSY) != 0; 94 } 95 96 static inline bool 97 xfs_alloc_allow_busy_reuse(int datatype) 98 { 99 return (datatype & XFS_ALLOC_NOBUSY) == 0; 100 } 101 102 /* freespace limit calculations */ 103 #define XFS_ALLOC_AGFL_RESERVE 4 104 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 105 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 106 107 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, 108 xfs_extlen_t need, xfs_extlen_t reserved); 109 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 110 struct xfs_perag *pag); 111 112 /* 113 * Compute and fill in value of m_ag_maxlevels. 114 */ 115 void 116 xfs_alloc_compute_maxlevels( 117 struct xfs_mount *mp); /* file system mount structure */ 118 119 /* 120 * Get a block from the freelist. 121 * Returns with the buffer for the block gotten. 122 */ 123 int /* error */ 124 xfs_alloc_get_freelist( 125 struct xfs_trans *tp, /* transaction pointer */ 126 struct xfs_buf *agbp, /* buffer containing the agf structure */ 127 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 128 int btreeblk); /* destination is a AGF btree */ 129 130 /* 131 * Log the given fields from the agf structure. 132 */ 133 void 134 xfs_alloc_log_agf( 135 struct xfs_trans *tp, /* transaction pointer */ 136 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 137 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 138 139 /* 140 * Interface for inode allocation to force the pag data to be initialized. 141 */ 142 int /* error */ 143 xfs_alloc_pagf_init( 144 struct xfs_mount *mp, /* file system mount structure */ 145 struct xfs_trans *tp, /* transaction pointer */ 146 xfs_agnumber_t agno, /* allocation group number */ 147 int flags); /* XFS_ALLOC_FLAGS_... */ 148 149 /* 150 * Put the block on the freelist for the allocation group. 151 */ 152 int /* error */ 153 xfs_alloc_put_freelist( 154 struct xfs_trans *tp, /* transaction pointer */ 155 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 156 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 157 xfs_agblock_t bno, /* block being freed */ 158 int btreeblk); /* owner was a AGF btree */ 159 160 /* 161 * Read in the allocation group header (free/alloc section). 162 */ 163 int /* error */ 164 xfs_alloc_read_agf( 165 struct xfs_mount *mp, /* mount point structure */ 166 struct xfs_trans *tp, /* transaction pointer */ 167 xfs_agnumber_t agno, /* allocation group number */ 168 int flags, /* XFS_ALLOC_FLAG_... */ 169 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 170 171 /* 172 * Allocate an extent (variable-size). 173 */ 174 int /* error */ 175 xfs_alloc_vextent( 176 xfs_alloc_arg_t *args); /* allocation argument structure */ 177 178 /* 179 * Free an extent. 180 */ 181 int /* error */ 182 __xfs_free_extent( 183 struct xfs_trans *tp, /* transaction pointer */ 184 xfs_fsblock_t bno, /* starting block number of extent */ 185 xfs_extlen_t len, /* length of extent */ 186 struct xfs_owner_info *oinfo, /* extent owner */ 187 enum xfs_ag_resv_type type, /* block reservation type */ 188 bool skip_discard); 189 190 static inline int 191 xfs_free_extent( 192 struct xfs_trans *tp, 193 xfs_fsblock_t bno, 194 xfs_extlen_t len, 195 struct xfs_owner_info *oinfo, 196 enum xfs_ag_resv_type type) 197 { 198 return __xfs_free_extent(tp, bno, len, oinfo, type, false); 199 } 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_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t, 227 struct xfs_buf *, struct xfs_owner_info *); 228 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 229 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, 230 struct xfs_buf **agbp); 231 232 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 233 234 typedef int (*xfs_alloc_query_range_fn)( 235 struct xfs_btree_cur *cur, 236 struct xfs_alloc_rec_incore *rec, 237 void *priv); 238 239 int xfs_alloc_query_range(struct xfs_btree_cur *cur, 240 struct xfs_alloc_rec_incore *low_rec, 241 struct xfs_alloc_rec_incore *high_rec, 242 xfs_alloc_query_range_fn fn, void *priv); 243 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn, 244 void *priv); 245 246 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno, 247 xfs_extlen_t len, bool *exist); 248 249 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno, 250 void *priv); 251 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf, 252 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv); 253 254 #endif /* __XFS_ALLOC_H__ */ 255