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 (1U << 0) /* use trylock for buffer locking */ 23 #define XFS_ALLOC_FLAG_FREEING (1U << 1) /* indicate caller is freeing extents*/ 24 #define XFS_ALLOC_FLAG_NORMAP (1U << 2) /* don't modify the rmapbt */ 25 #define XFS_ALLOC_FLAG_NOSHRINK (1U << 3) /* don't shrink the freelist */ 26 #define XFS_ALLOC_FLAG_CHECK (1U << 4) /* test only, don't modify args */ 27 #define XFS_ALLOC_FLAG_TRYFLUSH (1U << 5) /* don't wait in busy extent flush */ 28 29 /* 30 * Argument structure for xfs_alloc routines. 31 * This is turned into a structure to avoid having 20 arguments passed 32 * down several levels of the stack. 33 */ 34 typedef struct xfs_alloc_arg { 35 struct xfs_trans *tp; /* transaction pointer */ 36 struct xfs_mount *mp; /* file system mount point */ 37 struct xfs_buf *agbp; /* buffer for a.g. freelist header */ 38 struct xfs_perag *pag; /* per-ag struct for this agno */ 39 xfs_fsblock_t fsbno; /* file system block number */ 40 xfs_agnumber_t agno; /* allocation group number */ 41 xfs_agblock_t agbno; /* allocation group-relative block # */ 42 xfs_extlen_t minlen; /* minimum size of extent */ 43 xfs_extlen_t maxlen; /* maximum size of extent */ 44 xfs_extlen_t mod; /* mod value for extent size */ 45 xfs_extlen_t prod; /* prod value for extent size */ 46 xfs_extlen_t minleft; /* min blocks must be left after us */ 47 xfs_extlen_t total; /* total blocks needed in xaction */ 48 xfs_extlen_t alignment; /* align answer to multiple of this */ 49 xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */ 50 xfs_agblock_t min_agbno; /* set an agbno range for NEAR allocs */ 51 xfs_agblock_t max_agbno; /* ... */ 52 xfs_extlen_t len; /* output: actual size of extent */ 53 int datatype; /* mask defining data type treatment */ 54 char wasdel; /* set if allocation was prev delayed */ 55 char wasfromfl; /* set if allocation is from freelist */ 56 struct xfs_owner_info oinfo; /* owner of blocks being allocated */ 57 enum xfs_ag_resv_type resv; /* block reservation to use */ 58 #ifdef DEBUG 59 bool alloc_minlen_only; /* allocate exact minlen extent */ 60 #endif 61 } xfs_alloc_arg_t; 62 63 /* 64 * Defines for datatype 65 */ 66 #define XFS_ALLOC_USERDATA (1 << 0)/* allocation is for user data*/ 67 #define XFS_ALLOC_INITIAL_USER_DATA (1 << 1)/* special case start of file */ 68 #define XFS_ALLOC_NOBUSY (1 << 2)/* Busy extents not allowed */ 69 70 /* freespace limit calculations */ 71 unsigned int xfs_alloc_set_aside(struct xfs_mount *mp); 72 unsigned int xfs_alloc_ag_max_usable(struct xfs_mount *mp); 73 74 xfs_extlen_t xfs_alloc_longest_free_extent(struct xfs_perag *pag, 75 xfs_extlen_t need, xfs_extlen_t reserved); 76 unsigned int xfs_alloc_min_freelist(struct xfs_mount *mp, 77 struct xfs_perag *pag); 78 int xfs_alloc_get_freelist(struct xfs_perag *pag, struct xfs_trans *tp, 79 struct xfs_buf *agfbp, xfs_agblock_t *bnop, int btreeblk); 80 int xfs_alloc_put_freelist(struct xfs_perag *pag, struct xfs_trans *tp, 81 struct xfs_buf *agfbp, struct xfs_buf *agflbp, 82 xfs_agblock_t bno, int btreeblk); 83 int xfs_free_ag_extent(struct xfs_trans *tp, struct xfs_buf *agbp, 84 xfs_agnumber_t agno, xfs_agblock_t bno, 85 xfs_extlen_t len, const struct xfs_owner_info *oinfo, 86 enum xfs_ag_resv_type type); 87 88 /* 89 * Compute and fill in value of m_alloc_maxlevels. 90 */ 91 void 92 xfs_alloc_compute_maxlevels( 93 struct xfs_mount *mp); /* file system mount structure */ 94 95 /* 96 * Log the given fields from the agf structure. 97 */ 98 void 99 xfs_alloc_log_agf( 100 struct xfs_trans *tp, /* transaction pointer */ 101 struct xfs_buf *bp, /* buffer for a.g. freelist header */ 102 uint32_t fields);/* mask of fields to be logged (XFS_AGF_...) */ 103 104 /* 105 * Allocate an extent anywhere in the specific AG given. If there is no 106 * space matching the requirements in that AG, then the allocation will fail. 107 */ 108 int xfs_alloc_vextent_this_ag(struct xfs_alloc_arg *args, xfs_agnumber_t agno); 109 110 /* 111 * Allocate an extent as close to the target as possible. If there are not 112 * viable candidates in the AG, then fail the allocation. 113 */ 114 int xfs_alloc_vextent_near_bno(struct xfs_alloc_arg *args, 115 xfs_fsblock_t target); 116 117 /* 118 * Allocate an extent exactly at the target given. If this is not possible 119 * then the allocation fails. 120 */ 121 int xfs_alloc_vextent_exact_bno(struct xfs_alloc_arg *args, 122 xfs_fsblock_t target); 123 124 /* 125 * Best effort full filesystem allocation scan. 126 * 127 * Locality aware allocation will be attempted in the initial AG, but on failure 128 * non-localised attempts will be made. The AGs are constrained by previous 129 * allocations in the current transaction. Two passes will be made - the first 130 * non-blocking, the second blocking. 131 */ 132 int xfs_alloc_vextent_start_ag(struct xfs_alloc_arg *args, 133 xfs_fsblock_t target); 134 135 /* 136 * Iterate from the AG indicated from args->fsbno through to the end of the 137 * filesystem attempting blocking allocation. This is for use in last 138 * resort allocation attempts when everything else has failed. 139 */ 140 int xfs_alloc_vextent_first_ag(struct xfs_alloc_arg *args, 141 xfs_fsblock_t target); 142 143 /* 144 * Free an extent. 145 */ 146 int /* error */ 147 __xfs_free_extent( 148 struct xfs_trans *tp, /* transaction pointer */ 149 struct xfs_perag *pag, 150 xfs_agblock_t agbno, 151 xfs_extlen_t len, /* length of extent */ 152 const struct xfs_owner_info *oinfo, /* extent owner */ 153 enum xfs_ag_resv_type type, /* block reservation type */ 154 bool skip_discard); 155 156 static inline int 157 xfs_free_extent( 158 struct xfs_trans *tp, 159 struct xfs_perag *pag, 160 xfs_agblock_t agbno, 161 xfs_extlen_t len, 162 const struct xfs_owner_info *oinfo, 163 enum xfs_ag_resv_type type) 164 { 165 return __xfs_free_extent(tp, pag, agbno, len, oinfo, type, false); 166 } 167 168 int /* error */ 169 xfs_alloc_lookup_le( 170 struct xfs_btree_cur *cur, /* btree cursor */ 171 xfs_agblock_t bno, /* starting block of extent */ 172 xfs_extlen_t len, /* length of extent */ 173 int *stat); /* success/failure */ 174 175 int /* error */ 176 xfs_alloc_lookup_ge( 177 struct xfs_btree_cur *cur, /* btree cursor */ 178 xfs_agblock_t bno, /* starting block of extent */ 179 xfs_extlen_t len, /* length of extent */ 180 int *stat); /* success/failure */ 181 182 int /* error */ 183 xfs_alloc_get_rec( 184 struct xfs_btree_cur *cur, /* btree cursor */ 185 xfs_agblock_t *bno, /* output: starting block of extent */ 186 xfs_extlen_t *len, /* output: length of extent */ 187 int *stat); /* output: success/failure */ 188 189 union xfs_btree_rec; 190 void xfs_alloc_btrec_to_irec(const union xfs_btree_rec *rec, 191 struct xfs_alloc_rec_incore *irec); 192 xfs_failaddr_t xfs_alloc_check_irec(struct xfs_perag *pag, 193 const struct xfs_alloc_rec_incore *irec); 194 195 int xfs_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags, 196 struct xfs_buf **agfbpp); 197 int xfs_alloc_read_agf(struct xfs_perag *pag, struct xfs_trans *tp, int flags, 198 struct xfs_buf **agfbpp); 199 int xfs_alloc_read_agfl(struct xfs_perag *pag, struct xfs_trans *tp, 200 struct xfs_buf **bpp); 201 int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, uint32_t alloc_flags); 202 int xfs_free_extent_fix_freelist(struct xfs_trans *tp, struct xfs_perag *pag, 203 struct xfs_buf **agbp); 204 205 xfs_extlen_t xfs_prealloc_blocks(struct xfs_mount *mp); 206 207 typedef int (*xfs_alloc_query_range_fn)( 208 struct xfs_btree_cur *cur, 209 const struct xfs_alloc_rec_incore *rec, 210 void *priv); 211 212 int xfs_alloc_query_range(struct xfs_btree_cur *cur, 213 const struct xfs_alloc_rec_incore *low_rec, 214 const struct xfs_alloc_rec_incore *high_rec, 215 xfs_alloc_query_range_fn fn, void *priv); 216 int xfs_alloc_query_all(struct xfs_btree_cur *cur, xfs_alloc_query_range_fn fn, 217 void *priv); 218 219 int xfs_alloc_has_records(struct xfs_btree_cur *cur, xfs_agblock_t bno, 220 xfs_extlen_t len, enum xbtree_recpacking *outcome); 221 222 typedef int (*xfs_agfl_walk_fn)(struct xfs_mount *mp, xfs_agblock_t bno, 223 void *priv); 224 int xfs_agfl_walk(struct xfs_mount *mp, struct xfs_agf *agf, 225 struct xfs_buf *agflbp, xfs_agfl_walk_fn walk_fn, void *priv); 226 227 static inline __be32 * 228 xfs_buf_to_agfl_bno( 229 struct xfs_buf *bp) 230 { 231 if (xfs_has_crc(bp->b_mount)) 232 return bp->b_addr + sizeof(struct xfs_agfl); 233 return bp->b_addr; 234 } 235 236 int xfs_free_extent_later(struct xfs_trans *tp, xfs_fsblock_t bno, 237 xfs_filblks_t len, const struct xfs_owner_info *oinfo, 238 enum xfs_ag_resv_type type, unsigned int free_flags); 239 240 /* Don't issue a discard for the blocks freed. */ 241 #define XFS_FREE_EXTENT_SKIP_DISCARD (1U << 0) 242 243 #define XFS_FREE_EXTENT_ALL_FLAGS (XFS_FREE_EXTENT_SKIP_DISCARD) 244 245 /* 246 * List of extents to be free "later". 247 * The list is kept sorted on xbf_startblock. 248 */ 249 struct xfs_extent_free_item { 250 struct list_head xefi_list; 251 uint64_t xefi_owner; 252 xfs_fsblock_t xefi_startblock;/* starting fs block number */ 253 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */ 254 struct xfs_perag *xefi_pag; 255 unsigned int xefi_flags; 256 enum xfs_ag_resv_type xefi_agresv; 257 }; 258 259 #define XFS_EFI_SKIP_DISCARD (1U << 0) /* don't issue discard */ 260 #define XFS_EFI_ATTR_FORK (1U << 1) /* freeing attr fork block */ 261 #define XFS_EFI_BMBT_BLOCK (1U << 2) /* freeing bmap btree block */ 262 #define XFS_EFI_CANCELLED (1U << 3) /* dont actually free the space */ 263 264 struct xfs_alloc_autoreap { 265 struct xfs_defer_pending *dfp; 266 }; 267 268 int xfs_alloc_schedule_autoreap(const struct xfs_alloc_arg *args, 269 unsigned int free_flags, struct xfs_alloc_autoreap *aarp); 270 void xfs_alloc_cancel_autoreap(struct xfs_trans *tp, 271 struct xfs_alloc_autoreap *aarp); 272 void xfs_alloc_commit_autoreap(struct xfs_trans *tp, 273 struct xfs_alloc_autoreap *aarp); 274 275 extern struct kmem_cache *xfs_extfree_item_cache; 276 277 int __init xfs_extfree_intent_init_cache(void); 278 void xfs_extfree_intent_destroy_cache(void); 279 280 xfs_failaddr_t xfs_validate_ag_length(struct xfs_buf *bp, uint32_t seqno, 281 uint32_t length); 282 283 #endif /* __XFS_ALLOC_H__ */ 284