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 * Flags for xfs_alloc_fix_freelist. 21 */ 22 #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */ 23 #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/ 24 #define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */ 25 #define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */ 26 #define XFS_ALLOC_FLAG_CHECK 0x00000010 /* test only, don't modify args */ 27 28 /* 29 * Argument structure for xfs_alloc routines. 30 * This is turned into a structure to avoid having 20 arguments passed 31 * down several levels of the stack. 32 */ 33 typedef struct xfs_alloc_arg { 34 struct xfs_trans *tp; /* transaction pointer */ 35 struct xfs_mount *mp; /* file system mount point */ 36 struct xfs_buf *agbp; /* buffer for a.g. freelist header */ 37 struct xfs_perag *pag; /* per-ag struct for this agno */ 38 xfs_fsblock_t fsbno; /* file system block number */ 39 xfs_agnumber_t agno; /* allocation group number */ 40 xfs_agblock_t agbno; /* allocation group-relative block # */ 41 xfs_extlen_t minlen; /* minimum size of extent */ 42 xfs_extlen_t maxlen; /* maximum size of extent */ 43 xfs_extlen_t mod; /* mod value for extent size */ 44 xfs_extlen_t prod; /* prod value for extent size */ 45 xfs_extlen_t minleft; /* min blocks must be left after us */ 46 xfs_extlen_t total; /* total blocks needed in xaction */ 47 xfs_extlen_t alignment; /* align answer to multiple of this */ 48 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ 49 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ 50 xfs_agblock_t max_agbno; /* ... */ 51 xfs_extlen_t len; /* output: actual size of extent */ 52 int datatype; /* mask defining data type treatment */ 53 char wasdel; /* set if allocation was prev delayed */ 54 char wasfromfl; /* set if allocation is from freelist */ 55 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 56 enum xfs_ag_resv_type resv; /* block reservation to use */ 57 #ifdef DEBUG 58 bool alloc_minlen_only; /* allocate exact minlen extent */ 59 #endif 60 } xfs_alloc_arg_t; 61 62 /* 63 * Defines for datatype 64 */ 65 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 66 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 67 #define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */ 68 69 /* freespace limit calculations */ 70 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 71 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 72 73 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, 74 xfs_extlen_t need, xfs_extlen_t reserved); 75 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 76 struct xfs_perag *pag); 77 int xfs_alloc_get_freelist(struct xfs_perag *pag, struct xfs_trans *tp, 78 struct xfs_buf *agfbp, xfs_agblock_t *bnop, int btreeblk); 79 int xfs_alloc_put_freelist(struct xfs_perag *pag, struct xfs_trans *tp, 80 struct xfs_buf *agfbp, struct xfs_buf *agflbp, 81 xfs_agblock_t bno, int btreeblk); 82 83 /* 84 * Compute and fill in value of m_alloc_maxlevels. 85 */ 86 void 87 xfs_alloc_compute_maxlevels( 88 struct xfs_mount *mp); /* file system mount structure */ 89 90 /* 91 * Log the given fields from the agf structure. 92 */ 93 void 94 xfs_alloc_log_agf( 95 struct xfs_trans *tp, /* transaction pointer */ 96 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 97 uint32_t fields);/* mask of fields to be logged (XFS_AGF_...) */ 98 99 /* 100 * Allocate an extent anywhere in the specific AG given. If there is no 101 * space matching the requirements in that AG, then the allocation will fail. 102 */ 103 int xfs_alloc_vextent_this_ag(struct xfs_alloc_arg *args, xfs_agnumber_t agno); 104 105 /* 106 * Allocate an extent as close to the target as possible. If there are not 107 * viable candidates in the AG, then fail the allocation. 108 */ 109 int xfs_alloc_vextent_near_bno(struct xfs_alloc_arg *args, 110 xfs_fsblock_t target); 111 112 /* 113 * Allocate an extent exactly at the target given. If this is not possible 114 * then the allocation fails. 115 */ 116 int xfs_alloc_vextent_exact_bno(struct xfs_alloc_arg *args, 117 xfs_fsblock_t target); 118 119 /* 120 * Best effort full filesystem allocation scan. 121 * 122 * Locality aware allocation will be attempted in the initial AG, but on failure 123 * non-localised attempts will be made. The AGs are constrained by previous 124 * allocations in the current transaction. Two passes will be made - the first 125 * non-blocking, the second blocking. 126 */ 127 int xfs_alloc_vextent_start_ag(struct xfs_alloc_arg *args, 128 xfs_fsblock_t target); 129 130 /* 131 * Iterate from the AG indicated from args->fsbno through to the end of the 132 * filesystem attempting blocking allocation. This is for use in last 133 * resort allocation attempts when everything else has failed. 134 */ 135 int xfs_alloc_vextent_first_ag(struct xfs_alloc_arg *args, 136 xfs_fsblock_t target); 137 138 /* 139 * Free an extent. 140 */ 141 int /* error */ 142 __xfs_free_extent( 143 struct xfs_trans *tp, /* transaction pointer */ 144 struct xfs_perag *pag, 145 xfs_agblock_t agbno, 146 xfs_extlen_t len, /* length of extent */ 147 const struct xfs_owner_info *oinfo, /* extent owner */ 148 enum xfs_ag_resv_type type, /* block reservation type */ 149 bool skip_discard); 150 151 static inline int 152 xfs_free_extent( 153 struct xfs_trans *tp, 154 struct xfs_perag *pag, 155 xfs_agblock_t agbno, 156 xfs_extlen_t len, 157 const struct xfs_owner_info *oinfo, 158 enum xfs_ag_resv_type type) 159 { 160 return __xfs_free_extent(tp, pag, agbno, len, oinfo, type, false); 161 } 162 163 int /* error */ 164 xfs_alloc_lookup_le( 165 struct xfs_btree_cur *cur, /* btree cursor */ 166 xfs_agblock_t bno, /* starting block of extent */ 167 xfs_extlen_t len, /* length of extent */ 168 int *stat); /* success/failure */ 169 170 int /* error */ 171 xfs_alloc_lookup_ge( 172 struct xfs_btree_cur *cur, /* btree cursor */ 173 xfs_agblock_t bno, /* starting block of extent */ 174 xfs_extlen_t len, /* length of extent */ 175 int *stat); /* success/failure */ 176 177 int /* error */ 178 xfs_alloc_get_rec( 179 struct xfs_btree_cur *cur, /* btree cursor */ 180 xfs_agblock_t *bno, /* output: starting block of extent */ 181 xfs_extlen_t *len, /* output: length of extent */ 182 int *stat); /* output: success/failure */ 183 184 union xfs_btree_rec; 185 void xfs_alloc_btrec_to_irec(const union xfs_btree_rec *rec, 186 struct xfs_alloc_rec_incore *irec); 187 xfs_failaddr_t xfs_alloc_check_irec(struct xfs_btree_cur *cur, 188 const struct xfs_alloc_rec_incore *irec); 189 190 int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags, 191 struct xfs_buf **agfbpp); 192 int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags, 193 struct xfs_buf **agfbpp); 194 int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp, 195 struct xfs_buf **bpp); 196 int xfs_free_agfl_block(struct xfs_trans *, xfs_agnumber_t, xfs_agblock_t, 197 struct xfs_buf *, struct xfs_owner_info *); 198 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags); 199 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag, 200 struct xfs_buf **agbp); 201 202 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 203 204 typedef int (*xfs_alloc_query_range_fn)( 205 struct xfs_btree_cur *cur, 206 const struct xfs_alloc_rec_incore *rec, 207 void *priv); 208 209 int xfs_alloc_query_range(struct xfs_btree_cur *cur, 210 const struct xfs_alloc_rec_incore *low_rec, 211 const struct xfs_alloc_rec_incore *high_rec, 212 xfs_alloc_query_range_fn fn, void *priv); 213 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn, 214 void *priv); 215 216 int xfs_alloc_has_records(struct xfs_btree_cur *cur, xfs_agblock_t bno, 217 xfs_extlen_t len, enum xbtree_recpacking *outcome); 218 219 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno, 220 void *priv); 221 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf, 222 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv); 223 224 static inline __be32 * 225 xfs_buf_to_agfl_bno( 226 struct xfs_buf *bp) 227 { 228 if (xfs_has_crc(bp->b_mount)) 229 return bp->b_addr + sizeof(struct xfs_agfl); 230 return bp->b_addr; 231 } 232 233 int __xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno, 234 xfs_filblks_t len, const struct xfs_owner_info *oinfo, 235 bool skip_discard); 236 237 /* 238 * List of extents to be free "later". 239 * The list is kept sorted on xbf_startblock. 240 */ 241 struct xfs_extent_free_item { 242 struct list_head xefi_list; 243 uint64_t xefi_owner; 244 xfs_fsblock_t xefi_startblock;/* starting fs block number */ 245 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */ 246 struct xfs_perag *xefi_pag; 247 unsigned int xefi_flags; 248 }; 249 250 void xfs_extent_free_get_group(struct xfs_mount *mp, 251 struct xfs_extent_free_item *xefi); 252 253 #define XFS_EFI_SKIP_DISCARD (1U << 0) /* don't issue discard */ 254 #define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */ 255 #define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */ 256 257 static inline int 258 xfs_free_extent_later( 259 struct xfs_trans *tp, 260 xfs_fsblock_t bno, 261 xfs_filblks_t len, 262 const struct xfs_owner_info *oinfo) 263 { 264 return __xfs_free_extent_later(tp, bno, len, oinfo, false); 265 } 266 267 268 extern struct kmem_cache *xfs_extfree_item_cache; 269 270 int __init xfs_extfree_intent_init_cache(void); 271 void xfs_extfree_intent_destroy_cache(void); 272 273 #endif /* __XFS_ALLOC_H__ */ 274