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 struct xfs_mount; 11 struct xfs_trans; 12 struct xfs_perag; 13 14 /* 15 * Per-ag infrastructure 16 */ 17 18 /* per-AG block reservation data structures*/ 19 struct xfs_ag_resv { 20 /* number of blocks originally reserved here */ 21 xfs_extlen_t ar_orig_reserved; 22 /* number of blocks reserved here */ 23 xfs_extlen_t ar_reserved; 24 /* number of blocks originally asked for */ 25 xfs_extlen_t ar_asked; 26 }; 27 28 /* 29 * Per-ag incore structure, copies of information in agf and agi, to improve the 30 * performance of allocation group selection. 31 */ 32 struct xfs_perag { 33 struct xfs_mount *pag_mount; /* owner filesystem */ 34 xfs_agnumber_t pag_agno; /* AG this structure belongs to */ 35 atomic_t pag_ref; /* passive reference count */ 36 atomic_t pag_active_ref; /* active reference count */ 37 wait_queue_head_t pag_active_wq;/* woken active_ref falls to zero */ 38 unsigned long pag_opstate; 39 uint8_t pagf_bno_level; /* # of levels in bno btree */ 40 uint8_t pagf_cnt_level; /* # of levels in cnt btree */ 41 uint8_t pagf_rmap_level;/* # of levels in rmap btree */ 42 uint32_t pagf_flcount; /* count of blocks in freelist */ 43 xfs_extlen_t pagf_freeblks; /* total free blocks */ 44 xfs_extlen_t pagf_longest; /* longest free space */ 45 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ 46 xfs_agino_t pagi_freecount; /* number of free inodes */ 47 xfs_agino_t pagi_count; /* number of allocated inodes */ 48 49 /* 50 * Inode allocation search lookup optimisation. 51 * If the pagino matches, the search for new inodes 52 * doesn't need to search the near ones again straight away 53 */ 54 xfs_agino_t pagl_pagino; 55 xfs_agino_t pagl_leftrec; 56 xfs_agino_t pagl_rightrec; 57 58 int pagb_count; /* pagb slots in use */ 59 uint8_t pagf_refcount_level; /* recount btree height */ 60 61 /* Blocks reserved for all kinds of metadata. */ 62 struct xfs_ag_resv pag_meta_resv; 63 /* Blocks reserved for the reverse mapping btree. */ 64 struct xfs_ag_resv pag_rmapbt_resv; 65 66 /* for rcu-safe freeing */ 67 struct rcu_head rcu_head; 68 69 /* Precalculated geometry info */ 70 xfs_agblock_t block_count; 71 xfs_agblock_t min_block; 72 xfs_agino_t agino_min; 73 xfs_agino_t agino_max; 74 75 #ifdef __KERNEL__ 76 /* -- kernel only structures below this line -- */ 77 78 /* 79 * Bitsets of per-ag metadata that have been checked and/or are sick. 80 * Callers should hold pag_state_lock before accessing this field. 81 */ 82 uint16_t pag_checked; 83 uint16_t pag_sick; 84 85 #ifdef CONFIG_XFS_ONLINE_REPAIR 86 /* 87 * Alternate btree heights so that online repair won't trip the write 88 * verifiers while rebuilding the AG btrees. 89 */ 90 uint8_t pagf_repair_bno_level; 91 uint8_t pagf_repair_cnt_level; 92 uint8_t pagf_repair_refcount_level; 93 uint8_t pagf_repair_rmap_level; 94 #endif 95 96 spinlock_t pag_state_lock; 97 98 spinlock_t pagb_lock; /* lock for pagb_tree */ 99 struct rb_root pagb_tree; /* ordered tree of busy extents */ 100 unsigned int pagb_gen; /* generation count for pagb_tree */ 101 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */ 102 103 atomic_t pagf_fstrms; /* # of filestreams active in this AG */ 104 105 spinlock_t pag_ici_lock; /* incore inode cache lock */ 106 struct radix_tree_root pag_ici_root; /* incore inode cache root */ 107 int pag_ici_reclaimable; /* reclaimable inodes */ 108 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ 109 110 struct xfs_buf_cache pag_bcache; 111 112 /* background prealloc block trimming */ 113 struct delayed_work pag_blockgc_work; 114 115 /* 116 * We use xfs_drain to track the number of deferred log intent items 117 * that have been queued (but not yet processed) so that waiters (e.g. 118 * scrub) will not lock resources when other threads are in the middle 119 * of processing a chain of intent items only to find momentary 120 * inconsistencies. 121 */ 122 struct xfs_defer_drain pag_intents_drain; 123 124 /* Hook to feed rmapbt updates to an active online repair. */ 125 struct xfs_hooks pag_rmap_update_hooks; 126 #endif /* __KERNEL__ */ 127 }; 128 129 /* 130 * Per-AG operational state. These are atomic flag bits. 131 */ 132 #define XFS_AGSTATE_AGF_INIT 0 133 #define XFS_AGSTATE_AGI_INIT 1 134 #define XFS_AGSTATE_PREFERS_METADATA 2 135 #define XFS_AGSTATE_ALLOWS_INODES 3 136 #define XFS_AGSTATE_AGFL_NEEDS_RESET 4 137 138 #define __XFS_AG_OPSTATE(name, NAME) \ 139 static inline bool xfs_perag_ ## name (struct xfs_perag *pag) \ 140 { \ 141 return test_bit(XFS_AGSTATE_ ## NAME, &pag->pag_opstate); \ 142 } 143 144 __XFS_AG_OPSTATE(initialised_agf, AGF_INIT) 145 __XFS_AG_OPSTATE(initialised_agi, AGI_INIT) 146 __XFS_AG_OPSTATE(prefers_metadata, PREFERS_METADATA) 147 __XFS_AG_OPSTATE(allows_inodes, ALLOWS_INODES) 148 __XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET) 149 150 void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart, 151 xfs_agnumber_t agend); 152 int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount, 153 xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi); 154 int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); 155 void xfs_free_perag(struct xfs_mount *mp); 156 157 /* Passive AG references */ 158 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno); 159 struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno, 160 unsigned int tag); 161 struct xfs_perag *xfs_perag_hold(struct xfs_perag *pag); 162 void xfs_perag_put(struct xfs_perag *pag); 163 164 /* Active AG references */ 165 struct xfs_perag *xfs_perag_grab(struct xfs_mount *, xfs_agnumber_t); 166 struct xfs_perag *xfs_perag_grab_tag(struct xfs_mount *, xfs_agnumber_t, 167 int tag); 168 void xfs_perag_rele(struct xfs_perag *pag); 169 170 /* 171 * Per-ag geometry infomation and validation 172 */ 173 xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno); 174 void xfs_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno, 175 xfs_agino_t *first, xfs_agino_t *last); 176 177 static inline bool 178 xfs_verify_agbno(struct xfs_perag *pag, xfs_agblock_t agbno) 179 { 180 if (agbno >= pag->block_count) 181 return false; 182 if (agbno <= pag->min_block) 183 return false; 184 return true; 185 } 186 187 static inline bool 188 xfs_verify_agbext( 189 struct xfs_perag *pag, 190 xfs_agblock_t agbno, 191 xfs_agblock_t len) 192 { 193 if (agbno + len <= agbno) 194 return false; 195 196 if (!xfs_verify_agbno(pag, agbno)) 197 return false; 198 199 return xfs_verify_agbno(pag, agbno + len - 1); 200 } 201 202 /* 203 * Verify that an AG inode number pointer neither points outside the AG 204 * nor points at static metadata. 205 */ 206 static inline bool 207 xfs_verify_agino(struct xfs_perag *pag, xfs_agino_t agino) 208 { 209 if (agino < pag->agino_min) 210 return false; 211 if (agino > pag->agino_max) 212 return false; 213 return true; 214 } 215 216 /* 217 * Verify that an AG inode number pointer neither points outside the AG 218 * nor points at static metadata, or is NULLAGINO. 219 */ 220 static inline bool 221 xfs_verify_agino_or_null(struct xfs_perag *pag, xfs_agino_t agino) 222 { 223 if (agino == NULLAGINO) 224 return true; 225 return xfs_verify_agino(pag, agino); 226 } 227 228 static inline bool 229 xfs_ag_contains_log(struct xfs_mount *mp, xfs_agnumber_t agno) 230 { 231 return mp->m_sb.sb_logstart > 0 && 232 agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart); 233 } 234 235 /* 236 * Perag iteration APIs 237 */ 238 static inline struct xfs_perag * 239 xfs_perag_next( 240 struct xfs_perag *pag, 241 xfs_agnumber_t *agno, 242 xfs_agnumber_t end_agno) 243 { 244 struct xfs_mount *mp = pag->pag_mount; 245 246 *agno = pag->pag_agno + 1; 247 xfs_perag_rele(pag); 248 while (*agno <= end_agno) { 249 pag = xfs_perag_grab(mp, *agno); 250 if (pag) 251 return pag; 252 (*agno)++; 253 } 254 return NULL; 255 } 256 257 #define for_each_perag_range(mp, agno, end_agno, pag) \ 258 for ((pag) = xfs_perag_grab((mp), (agno)); \ 259 (pag) != NULL; \ 260 (pag) = xfs_perag_next((pag), &(agno), (end_agno))) 261 262 #define for_each_perag_from(mp, agno, pag) \ 263 for_each_perag_range((mp), (agno), (mp)->m_sb.sb_agcount - 1, (pag)) 264 265 #define for_each_perag(mp, agno, pag) \ 266 (agno) = 0; \ 267 for_each_perag_from((mp), (agno), (pag)) 268 269 #define for_each_perag_tag(mp, agno, pag, tag) \ 270 for ((agno) = 0, (pag) = xfs_perag_grab_tag((mp), 0, (tag)); \ 271 (pag) != NULL; \ 272 (agno) = (pag)->pag_agno + 1, \ 273 xfs_perag_rele(pag), \ 274 (pag) = xfs_perag_grab_tag((mp), (agno), (tag))) 275 276 static inline struct xfs_perag * 277 xfs_perag_next_wrap( 278 struct xfs_perag *pag, 279 xfs_agnumber_t *agno, 280 xfs_agnumber_t stop_agno, 281 xfs_agnumber_t restart_agno, 282 xfs_agnumber_t wrap_agno) 283 { 284 struct xfs_mount *mp = pag->pag_mount; 285 286 *agno = pag->pag_agno + 1; 287 xfs_perag_rele(pag); 288 while (*agno != stop_agno) { 289 if (*agno >= wrap_agno) { 290 if (restart_agno >= stop_agno) 291 break; 292 *agno = restart_agno; 293 } 294 295 pag = xfs_perag_grab(mp, *agno); 296 if (pag) 297 return pag; 298 (*agno)++; 299 } 300 return NULL; 301 } 302 303 /* 304 * Iterate all AGs from start_agno through wrap_agno, then restart_agno through 305 * (start_agno - 1). 306 */ 307 #define for_each_perag_wrap_range(mp, start_agno, restart_agno, wrap_agno, agno, pag) \ 308 for ((agno) = (start_agno), (pag) = xfs_perag_grab((mp), (agno)); \ 309 (pag) != NULL; \ 310 (pag) = xfs_perag_next_wrap((pag), &(agno), (start_agno), \ 311 (restart_agno), (wrap_agno))) 312 /* 313 * Iterate all AGs from start_agno through wrap_agno, then 0 through 314 * (start_agno - 1). 315 */ 316 #define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) \ 317 for_each_perag_wrap_range((mp), (start_agno), 0, (wrap_agno), (agno), (pag)) 318 319 /* 320 * Iterate all AGs from start_agno through to the end of the filesystem, then 0 321 * through (start_agno - 1). 322 */ 323 #define for_each_perag_wrap(mp, start_agno, agno, pag) \ 324 for_each_perag_wrap_at((mp), (start_agno), (mp)->m_sb.sb_agcount, \ 325 (agno), (pag)) 326 327 328 struct aghdr_init_data { 329 /* per ag data */ 330 xfs_agblock_t agno; /* ag to init */ 331 xfs_extlen_t agsize; /* new AG size */ 332 struct list_head buffer_list; /* buffer writeback list */ 333 xfs_rfsblock_t nfree; /* cumulative new free space */ 334 335 /* per header data */ 336 xfs_daddr_t daddr; /* header location */ 337 size_t numblks; /* size of header */ 338 const struct xfs_btree_ops *bc_ops; /* btree ops */ 339 }; 340 341 int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id); 342 int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp, 343 xfs_extlen_t delta); 344 int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp, 345 xfs_extlen_t len); 346 int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo); 347 348 #endif /* __LIBXFS_AG_H */ 349