1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2018 Red Hat, Inc. 4 * All rights reserved. 5 */ 6 7 #ifndef __LIBXFS_AG_H 8 #define __LIBXFS_AG_H 1 9 10 #include "xfs_group.h" 11 12 struct xfs_mount; 13 struct xfs_trans; 14 struct xfs_perag; 15 16 /* 17 * Per-ag infrastructure 18 */ 19 20 /* per-AG block reservation data structures*/ 21 struct xfs_ag_resv { 22 /* number of blocks originally reserved here */ 23 xfs_extlen_t ar_orig_reserved; 24 /* number of blocks reserved here */ 25 xfs_extlen_t ar_reserved; 26 /* number of blocks originally asked for */ 27 xfs_extlen_t ar_asked; 28 }; 29 30 /* 31 * Per-ag incore structure, copies of information in agf and agi, to improve the 32 * performance of allocation group selection. 33 */ 34 struct xfs_perag { 35 struct xfs_group pag_group; 36 unsigned long pag_opstate; 37 uint8_t pagf_bno_level; /* # of levels in bno btree */ 38 uint8_t pagf_cnt_level; /* # of levels in cnt btree */ 39 uint8_t pagf_rmap_level;/* # of levels in rmap btree */ 40 uint32_t pagf_flcount; /* count of blocks in freelist */ 41 xfs_extlen_t pagf_freeblks; /* total free blocks */ 42 xfs_extlen_t pagf_longest; /* longest free space */ 43 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ 44 xfs_agino_t pagi_freecount; /* number of free inodes */ 45 xfs_agino_t pagi_count; /* number of allocated inodes */ 46 47 /* 48 * Inode allocation search lookup optimisation. 49 * If the pagino matches, the search for new inodes 50 * doesn't need to search the near ones again straight away 51 */ 52 xfs_agino_t pagl_pagino; 53 xfs_agino_t pagl_leftrec; 54 xfs_agino_t pagl_rightrec; 55 56 uint8_t pagf_refcount_level; /* recount btree height */ 57 58 /* Blocks reserved for all kinds of metadata. */ 59 struct xfs_ag_resv pag_meta_resv; 60 /* Blocks reserved for the reverse mapping btree. */ 61 struct xfs_ag_resv pag_rmapbt_resv; 62 63 /* Precalculated geometry info */ 64 xfs_agino_t agino_min; 65 xfs_agino_t agino_max; 66 67 #ifdef __KERNEL__ 68 /* -- kernel only structures below this line -- */ 69 70 #ifdef CONFIG_XFS_ONLINE_REPAIR 71 /* 72 * Alternate btree heights so that online repair won't trip the write 73 * verifiers while rebuilding the AG btrees. 74 */ 75 uint8_t pagf_repair_bno_level; 76 uint8_t pagf_repair_cnt_level; 77 uint8_t pagf_repair_refcount_level; 78 uint8_t pagf_repair_rmap_level; 79 #endif 80 81 atomic_t pagf_fstrms; /* # of filestreams active in this AG */ 82 83 spinlock_t pag_ici_lock; /* incore inode cache lock */ 84 struct radix_tree_root pag_ici_root; /* incore inode cache root */ 85 int pag_ici_reclaimable; /* reclaimable inodes */ 86 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ 87 88 struct xfs_buf_cache pag_bcache; 89 90 /* background prealloc block trimming */ 91 struct delayed_work pag_blockgc_work; 92 #endif /* __KERNEL__ */ 93 }; 94 95 static inline struct xfs_perag *to_perag(struct xfs_group *xg) 96 { 97 return container_of(xg, struct xfs_perag, pag_group); 98 } 99 100 static inline struct xfs_group *pag_group(struct xfs_perag *pag) 101 { 102 return &pag->pag_group; 103 } 104 105 static inline struct xfs_mount *pag_mount(const struct xfs_perag *pag) 106 { 107 return pag->pag_group.xg_mount; 108 } 109 110 static inline xfs_agnumber_t pag_agno(const struct xfs_perag *pag) 111 { 112 return pag->pag_group.xg_gno; 113 } 114 115 /* 116 * Per-AG operational state. These are atomic flag bits. 117 */ 118 #define XFS_AGSTATE_AGF_INIT 0 119 #define XFS_AGSTATE_AGI_INIT 1 120 #define XFS_AGSTATE_PREFERS_METADATA 2 121 #define XFS_AGSTATE_ALLOWS_INODES 3 122 #define XFS_AGSTATE_AGFL_NEEDS_RESET 4 123 124 #define __XFS_AG_OPSTATE(name, NAME) \ 125 static inline bool xfs_perag_ ## name (struct xfs_perag *pag) \ 126 { \ 127 return test_bit(XFS_AGSTATE_ ## NAME, &pag->pag_opstate); \ 128 } 129 130 __XFS_AG_OPSTATE(initialised_agf, AGF_INIT) 131 __XFS_AG_OPSTATE(initialised_agi, AGI_INIT) 132 __XFS_AG_OPSTATE(prefers_metadata, PREFERS_METADATA) 133 __XFS_AG_OPSTATE(allows_inodes, ALLOWS_INODES) 134 __XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET) 135 136 int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t orig_agcount, 137 xfs_agnumber_t new_agcount, xfs_rfsblock_t dcount, 138 xfs_agnumber_t *maxagi); 139 void xfs_free_perag_range(struct xfs_mount *mp, xfs_agnumber_t first_agno, 140 xfs_agnumber_t end_agno); 141 int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); 142 int xfs_update_last_ag_size(struct xfs_mount *mp, xfs_agnumber_t prev_agcount); 143 144 /* Passive AG references */ 145 static inline struct xfs_perag * 146 xfs_perag_get( 147 struct xfs_mount *mp, 148 xfs_agnumber_t agno) 149 { 150 return to_perag(xfs_group_get(mp, agno, XG_TYPE_AG)); 151 } 152 153 static inline struct xfs_perag * 154 xfs_perag_hold( 155 struct xfs_perag *pag) 156 { 157 return to_perag(xfs_group_hold(pag_group(pag))); 158 } 159 160 static inline void 161 xfs_perag_put( 162 struct xfs_perag *pag) 163 { 164 xfs_group_put(pag_group(pag)); 165 } 166 167 /* Active AG references */ 168 static inline struct xfs_perag * 169 xfs_perag_grab( 170 struct xfs_mount *mp, 171 xfs_agnumber_t agno) 172 { 173 return to_perag(xfs_group_grab(mp, agno, XG_TYPE_AG)); 174 } 175 176 static inline void 177 xfs_perag_rele( 178 struct xfs_perag *pag) 179 { 180 xfs_group_rele(pag_group(pag)); 181 } 182 183 static inline struct xfs_perag * 184 xfs_perag_next_range( 185 struct xfs_mount *mp, 186 struct xfs_perag *pag, 187 xfs_agnumber_t start_agno, 188 xfs_agnumber_t end_agno) 189 { 190 return to_perag(xfs_group_next_range(mp, pag ? pag_group(pag) : NULL, 191 start_agno, end_agno, XG_TYPE_AG)); 192 } 193 194 static inline struct xfs_perag * 195 xfs_perag_next_from( 196 struct xfs_mount *mp, 197 struct xfs_perag *pag, 198 xfs_agnumber_t start_agno) 199 { 200 return xfs_perag_next_range(mp, pag, start_agno, mp->m_sb.sb_agcount - 1); 201 } 202 203 static inline struct xfs_perag * 204 xfs_perag_next( 205 struct xfs_mount *mp, 206 struct xfs_perag *pag) 207 { 208 return xfs_perag_next_from(mp, pag, 0); 209 } 210 211 /* 212 * Per-ag geometry infomation and validation 213 */ 214 xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno); 215 void xfs_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno, 216 xfs_agino_t *first, xfs_agino_t *last); 217 218 static inline bool 219 xfs_verify_agbno(struct xfs_perag *pag, xfs_agblock_t agbno) 220 { 221 return xfs_verify_gbno(pag_group(pag), agbno); 222 } 223 224 static inline bool 225 xfs_verify_agbext( 226 struct xfs_perag *pag, 227 xfs_agblock_t agbno, 228 xfs_agblock_t len) 229 { 230 return xfs_verify_gbext(pag_group(pag), agbno, len); 231 } 232 233 /* 234 * Verify that an AG inode number pointer neither points outside the AG 235 * nor points at static metadata. 236 */ 237 static inline bool 238 xfs_verify_agino(struct xfs_perag *pag, xfs_agino_t agino) 239 { 240 if (agino < pag->agino_min) 241 return false; 242 if (agino > pag->agino_max) 243 return false; 244 return true; 245 } 246 247 /* 248 * Verify that an AG inode number pointer neither points outside the AG 249 * nor points at static metadata, or is NULLAGINO. 250 */ 251 static inline bool 252 xfs_verify_agino_or_null(struct xfs_perag *pag, xfs_agino_t agino) 253 { 254 if (agino == NULLAGINO) 255 return true; 256 return xfs_verify_agino(pag, agino); 257 } 258 259 static inline bool 260 xfs_ag_contains_log(struct xfs_mount *mp, xfs_agnumber_t agno) 261 { 262 return mp->m_sb.sb_logstart > 0 && 263 agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart); 264 } 265 266 static inline struct xfs_perag * 267 xfs_perag_next_wrap( 268 struct xfs_perag *pag, 269 xfs_agnumber_t *agno, 270 xfs_agnumber_t stop_agno, 271 xfs_agnumber_t restart_agno, 272 xfs_agnumber_t wrap_agno) 273 { 274 struct xfs_mount *mp = pag_mount(pag); 275 276 *agno = pag_agno(pag) + 1; 277 xfs_perag_rele(pag); 278 while (*agno != stop_agno) { 279 if (*agno >= wrap_agno) { 280 if (restart_agno >= stop_agno) 281 break; 282 *agno = restart_agno; 283 } 284 285 pag = xfs_perag_grab(mp, *agno); 286 if (pag) 287 return pag; 288 (*agno)++; 289 } 290 return NULL; 291 } 292 293 /* 294 * Iterate all AGs from start_agno through wrap_agno, then restart_agno through 295 * (start_agno - 1). 296 */ 297 #define for_each_perag_wrap_range(mp, start_agno, restart_agno, wrap_agno, agno, pag) \ 298 for ((agno) = (start_agno), (pag) = xfs_perag_grab((mp), (agno)); \ 299 (pag) != NULL; \ 300 (pag) = xfs_perag_next_wrap((pag), &(agno), (start_agno), \ 301 (restart_agno), (wrap_agno))) 302 /* 303 * Iterate all AGs from start_agno through wrap_agno, then 0 through 304 * (start_agno - 1). 305 */ 306 #define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) \ 307 for_each_perag_wrap_range((mp), (start_agno), 0, (wrap_agno), (agno), (pag)) 308 309 /* 310 * Iterate all AGs from start_agno through to the end of the filesystem, then 0 311 * through (start_agno - 1). 312 */ 313 #define for_each_perag_wrap(mp, start_agno, agno, pag) \ 314 for_each_perag_wrap_at((mp), (start_agno), (mp)->m_sb.sb_agcount, \ 315 (agno), (pag)) 316 317 318 struct aghdr_init_data { 319 /* per ag data */ 320 xfs_agblock_t agno; /* ag to init */ 321 xfs_extlen_t agsize; /* new AG size */ 322 struct list_head buffer_list; /* buffer writeback list */ 323 xfs_rfsblock_t nfree; /* cumulative new free space */ 324 325 /* per header data */ 326 xfs_daddr_t daddr; /* header location */ 327 size_t numblks; /* size of header */ 328 const struct xfs_btree_ops *bc_ops; /* btree ops */ 329 }; 330 331 int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id); 332 int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp, 333 xfs_extlen_t delta); 334 int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp, 335 xfs_extlen_t len); 336 int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo); 337 338 static inline xfs_fsblock_t 339 xfs_agbno_to_fsb( 340 struct xfs_perag *pag, 341 xfs_agblock_t agbno) 342 { 343 return XFS_AGB_TO_FSB(pag_mount(pag), pag_agno(pag), agbno); 344 } 345 346 static inline xfs_daddr_t 347 xfs_agbno_to_daddr( 348 struct xfs_perag *pag, 349 xfs_agblock_t agbno) 350 { 351 return XFS_AGB_TO_DADDR(pag_mount(pag), pag_agno(pag), agbno); 352 } 353 354 static inline xfs_ino_t 355 xfs_agino_to_ino( 356 struct xfs_perag *pag, 357 xfs_agino_t agino) 358 { 359 return XFS_AGINO_TO_INO(pag_mount(pag), pag_agno(pag), agino); 360 } 361 362 #endif /* __LIBXFS_AG_H */ 363