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 xfs_fsblock_t fsbno; /* file system block number */ 58 xfs_agnumber_t agno; /* allocation group number */ 59 xfs_agblock_t agbno; /* allocation group-relative block # */ 60 xfs_extlen_t minlen; /* minimum size of extent */ 61 xfs_extlen_t maxlen; /* maximum size of extent */ 62 xfs_extlen_t mod; /* mod value for extent size */ 63 xfs_extlen_t prod; /* prod value for extent size */ 64 xfs_extlen_t minleft; /* min blocks must be left after us */ 65 xfs_extlen_t total; /* total blocks needed in xaction */ 66 xfs_extlen_t alignment; /* align answer to multiple of this */ 67 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ 68 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ 69 xfs_agblock_t max_agbno; /* ... */ 70 xfs_extlen_t len; /* output: actual size of extent */ 71 xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */ 72 xfs_alloctype_t otype; /* original allocation type */ 73 int datatype; /* mask defining data type treatment */ 74 char wasdel; /* set if allocation was prev delayed */ 75 char wasfromfl; /* set if allocation is from freelist */ 76 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 77 enum xfs_ag_resv_type resv; /* block reservation to use */ 78 } xfs_alloc_arg_t; 79 80 /* 81 * Defines for datatype 82 */ 83 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 84 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 85 #define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */ 86 87 /* freespace limit calculations */ 88 #define XFS_ALLOC_AGFL_RESERVE 4 89 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 90 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 91 92 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, 93 xfs_extlen_t need, xfs_extlen_t reserved); 94 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 95 struct xfs_perag *pag); 96 97 /* 98 * Compute and fill in value of m_ag_maxlevels. 99 */ 100 void 101 xfs_alloc_compute_maxlevels( 102 struct xfs_mount *mp); /* file system mount structure */ 103 104 /* 105 * Get a block from the freelist. 106 * Returns with the buffer for the block gotten. 107 */ 108 int /* error */ 109 xfs_alloc_get_freelist( 110 struct xfs_trans *tp, /* transaction pointer */ 111 struct xfs_buf *agbp, /* buffer containing the agf structure */ 112 xfs_agblock_t *bnop, /* block address retrieved from freelist */ 113 int btreeblk); /* destination is a AGF btree */ 114 115 /* 116 * Log the given fields from the agf structure. 117 */ 118 void 119 xfs_alloc_log_agf( 120 struct xfs_trans *tp, /* transaction pointer */ 121 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 122 int fields);/* mask of fields to be logged (XFS_AGF_...) */ 123 124 /* 125 * Interface for inode allocation to force the pag data to be initialized. 126 */ 127 int /* error */ 128 xfs_alloc_pagf_init( 129 struct xfs_mount *mp, /* file system mount structure */ 130 struct xfs_trans *tp, /* transaction pointer */ 131 xfs_agnumber_t agno, /* allocation group number */ 132 int flags); /* XFS_ALLOC_FLAGS_... */ 133 134 /* 135 * Put the block on the freelist for the allocation group. 136 */ 137 int /* error */ 138 xfs_alloc_put_freelist( 139 struct xfs_trans *tp, /* transaction pointer */ 140 struct xfs_buf *agbp, /* buffer for a.g. freelist header */ 141 struct xfs_buf *agflbp,/* buffer for a.g. free block array */ 142 xfs_agblock_t bno, /* block being freed */ 143 int btreeblk); /* owner was a AGF btree */ 144 145 /* 146 * Read in the allocation group header (free/alloc section). 147 */ 148 int /* error */ 149 xfs_alloc_read_agf( 150 struct xfs_mount *mp, /* mount point structure */ 151 struct xfs_trans *tp, /* transaction pointer */ 152 xfs_agnumber_t agno, /* allocation group number */ 153 int flags, /* XFS_ALLOC_FLAG_... */ 154 struct xfs_buf **bpp); /* buffer for the ag freelist header */ 155 156 /* 157 * Allocate an extent (variable-size). 158 */ 159 int /* error */ 160 xfs_alloc_vextent( 161 xfs_alloc_arg_t *args); /* allocation argument structure */ 162 163 /* 164 * Free an extent. 165 */ 166 int /* error */ 167 __xfs_free_extent( 168 struct xfs_trans *tp, /* transaction pointer */ 169 xfs_fsblock_t bno, /* starting block number of extent */ 170 xfs_extlen_t len, /* length of extent */ 171 const struct xfs_owner_info *oinfo, /* extent owner */ 172 enum xfs_ag_resv_type type, /* block reservation type */ 173 bool skip_discard); 174 175 static inline int 176 xfs_free_extent( 177 struct xfs_trans *tp, 178 xfs_fsblock_t bno, 179 xfs_extlen_t len, 180 const struct xfs_owner_info *oinfo, 181 enum xfs_ag_resv_type type) 182 { 183 return __xfs_free_extent(tp, bno, len, oinfo, type, false); 184 } 185 186 int /* error */ 187 xfs_alloc_lookup_le( 188 struct xfs_btree_cur *cur, /* btree cursor */ 189 xfs_agblock_t bno, /* starting block of extent */ 190 xfs_extlen_t len, /* length of extent */ 191 int *stat); /* success/failure */ 192 193 int /* error */ 194 xfs_alloc_lookup_ge( 195 struct xfs_btree_cur *cur, /* btree cursor */ 196 xfs_agblock_t bno, /* starting block of extent */ 197 xfs_extlen_t len, /* length of extent */ 198 int *stat); /* success/failure */ 199 200 int /* error */ 201 xfs_alloc_get_rec( 202 struct xfs_btree_cur *cur, /* btree cursor */ 203 xfs_agblock_t *bno, /* output: starting block of extent */ 204 xfs_extlen_t *len, /* output: length of extent */ 205 int *stat); /* output: success/failure */ 206 207 int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, 208 xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); 209 int xfs_alloc_read_agfl(struct xfs_mount *mp, struct xfs_trans *tp, 210 xfs_agnumber_t agno, struct xfs_buf **bpp); 211 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t, 212 struct xfs_buf *, struct xfs_owner_info *); 213 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 214 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno, 215 struct xfs_buf **agbp); 216 217 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 218 219 typedef int (*xfs_alloc_query_range_fn)( 220 struct xfs_btree_cur *cur, 221 struct xfs_alloc_rec_incore *rec, 222 void *priv); 223 224 int xfs_alloc_query_range(struct xfs_btree_cur *cur, 225 struct xfs_alloc_rec_incore *low_rec, 226 struct xfs_alloc_rec_incore *high_rec, 227 xfs_alloc_query_range_fn fn, void *priv); 228 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn, 229 void *priv); 230 231 int xfs_alloc_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno, 232 xfs_extlen_t len, bool *exist); 233 234 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno, 235 void *priv); 236 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf, 237 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv); 238 239 static inline __be32 * 240 xfs_buf_to_agfl_bno( 241 struct xfs_buf *bp) 242 { 243 if (xfs_sb_version_hascrc(&bp->b_mount->m_sb)) 244 return bp->b_addr + sizeof(struct xfs_agfl); 245 return bp->b_addr; 246 } 247 248 #endif /* __XFS_ALLOC_H__ */ 249