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_levels[XFS_BTNUM_AGF]; 40 /* # of levels in bno & cnt btree */ 41 uint32_t pagf_flcount; /* count of blocks in freelist */ 42 xfs_extlen_t pagf_freeblks; /* total free blocks */ 43 xfs_extlen_t pagf_longest; /* longest free space */ 44 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ 45 xfs_agino_t pagi_freecount; /* number of free inodes */ 46 xfs_agino_t pagi_count; /* number of allocated inodes */ 47 48 /* 49 * Inode allocation search lookup optimisation. 50 * If the pagino matches, the search for new inodes 51 * doesn't need to search the near ones again straight away 52 */ 53 xfs_agino_t pagl_pagino; 54 xfs_agino_t pagl_leftrec; 55 xfs_agino_t pagl_rightrec; 56 57 int pagb_count; /* pagb slots in use */ 58 uint8_t pagf_refcount_level; /* recount btree height */ 59 60 /* Blocks reserved for all kinds of metadata. */ 61 struct xfs_ag_resv pag_meta_resv; 62 /* Blocks reserved for the reverse mapping btree. */ 63 struct xfs_ag_resv pag_rmapbt_resv; 64 65 /* for rcu-safe freeing */ 66 struct rcu_head rcu_head; 67 68 /* Precalculated geometry info */ 69 xfs_agblock_t block_count; 70 xfs_agblock_t min_block; 71 xfs_agino_t agino_min; 72 xfs_agino_t agino_max; 73 74 #ifdef __KERNEL__ 75 /* -- kernel only structures below this line -- */ 76 77 /* 78 * Bitsets of per-ag metadata that have been checked and/or are sick. 79 * Callers should hold pag_state_lock before accessing this field. 80 */ 81 uint16_t pag_checked; 82 uint16_t pag_sick; 83 spinlock_t pag_state_lock; 84 85 spinlock_t pagb_lock; /* lock for pagb_tree */ 86 struct rb_root pagb_tree; /* ordered tree of busy extents */ 87 unsigned int pagb_gen; /* generation count for pagb_tree */ 88 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */ 89 90 atomic_t pagf_fstrms; /* # of filestreams active in this AG */ 91 92 spinlock_t pag_ici_lock; /* incore inode cache lock */ 93 struct radix_tree_root pag_ici_root; /* incore inode cache root */ 94 int pag_ici_reclaimable; /* reclaimable inodes */ 95 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ 96 97 /* buffer cache index */ 98 spinlock_t pag_buf_lock; /* lock for pag_buf_hash */ 99 struct rhashtable pag_buf_hash; 100 101 /* background prealloc block trimming */ 102 struct delayed_work pag_blockgc_work; 103 104 /* 105 * We use xfs_drain to track the number of deferred log intent items 106 * that have been queued (but not yet processed) so that waiters (e.g. 107 * scrub) will not lock resources when other threads are in the middle 108 * of processing a chain of intent items only to find momentary 109 * inconsistencies. 110 */ 111 struct xfs_defer_drain pag_intents_drain; 112 #endif /* __KERNEL__ */ 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 agcount, 137 xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi); 138 int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); 139 void xfs_free_perag(struct xfs_mount *mp); 140 141 /* Passive AG references */ 142 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno); 143 struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno, 144 unsigned int tag); 145 struct xfs_perag *xfs_perag_hold(struct xfs_perag *pag); 146 void xfs_perag_put(struct xfs_perag *pag); 147 148 /* Active AG references */ 149 struct xfs_perag *xfs_perag_grab(struct xfs_mount *, xfs_agnumber_t); 150 struct xfs_perag *xfs_perag_grab_tag(struct xfs_mount *, xfs_agnumber_t, 151 int tag); 152 void xfs_perag_rele(struct xfs_perag *pag); 153 154 /* 155 * Per-ag geometry infomation and validation 156 */ 157 xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno); 158 void xfs_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno, 159 xfs_agino_t *first, xfs_agino_t *last); 160 161 static inline bool 162 xfs_verify_agbno(struct xfs_perag *pag, xfs_agblock_t agbno) 163 { 164 if (agbno >= pag->block_count) 165 return false; 166 if (agbno <= pag->min_block) 167 return false; 168 return true; 169 } 170 171 static inline bool 172 xfs_verify_agbext( 173 struct xfs_perag *pag, 174 xfs_agblock_t agbno, 175 xfs_agblock_t len) 176 { 177 if (agbno + len <= agbno) 178 return false; 179 180 if (!xfs_verify_agbno(pag, agbno)) 181 return false; 182 183 return xfs_verify_agbno(pag, agbno + len - 1); 184 } 185 186 /* 187 * Verify that an AG inode number pointer neither points outside the AG 188 * nor points at static metadata. 189 */ 190 static inline bool 191 xfs_verify_agino(struct xfs_perag *pag, xfs_agino_t agino) 192 { 193 if (agino < pag->agino_min) 194 return false; 195 if (agino > pag->agino_max) 196 return false; 197 return true; 198 } 199 200 /* 201 * Verify that an AG inode number pointer neither points outside the AG 202 * nor points at static metadata, or is NULLAGINO. 203 */ 204 static inline bool 205 xfs_verify_agino_or_null(struct xfs_perag *pag, xfs_agino_t agino) 206 { 207 if (agino == NULLAGINO) 208 return true; 209 return xfs_verify_agino(pag, agino); 210 } 211 212 static inline bool 213 xfs_ag_contains_log(struct xfs_mount *mp, xfs_agnumber_t agno) 214 { 215 return mp->m_sb.sb_logstart > 0 && 216 agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart); 217 } 218 219 /* 220 * Perag iteration APIs 221 */ 222 static inline struct xfs_perag * 223 xfs_perag_next( 224 struct xfs_perag *pag, 225 xfs_agnumber_t *agno, 226 xfs_agnumber_t end_agno) 227 { 228 struct xfs_mount *mp = pag->pag_mount; 229 230 *agno = pag->pag_agno + 1; 231 xfs_perag_rele(pag); 232 while (*agno <= end_agno) { 233 pag = xfs_perag_grab(mp, *agno); 234 if (pag) 235 return pag; 236 (*agno)++; 237 } 238 return NULL; 239 } 240 241 #define for_each_perag_range(mp, agno, end_agno, pag) \ 242 for ((pag) = xfs_perag_grab((mp), (agno)); \ 243 (pag) != NULL; \ 244 (pag) = xfs_perag_next((pag), &(agno), (end_agno))) 245 246 #define for_each_perag_from(mp, agno, pag) \ 247 for_each_perag_range((mp), (agno), (mp)->m_sb.sb_agcount - 1, (pag)) 248 249 #define for_each_perag(mp, agno, pag) \ 250 (agno) = 0; \ 251 for_each_perag_from((mp), (agno), (pag)) 252 253 #define for_each_perag_tag(mp, agno, pag, tag) \ 254 for ((agno) = 0, (pag) = xfs_perag_grab_tag((mp), 0, (tag)); \ 255 (pag) != NULL; \ 256 (agno) = (pag)->pag_agno + 1, \ 257 xfs_perag_rele(pag), \ 258 (pag) = xfs_perag_grab_tag((mp), (agno), (tag))) 259 260 static inline struct xfs_perag * 261 xfs_perag_next_wrap( 262 struct xfs_perag *pag, 263 xfs_agnumber_t *agno, 264 xfs_agnumber_t stop_agno, 265 xfs_agnumber_t restart_agno, 266 xfs_agnumber_t wrap_agno) 267 { 268 struct xfs_mount *mp = pag->pag_mount; 269 270 *agno = pag->pag_agno + 1; 271 xfs_perag_rele(pag); 272 while (*agno != stop_agno) { 273 if (*agno >= wrap_agno) { 274 if (restart_agno >= stop_agno) 275 break; 276 *agno = restart_agno; 277 } 278 279 pag = xfs_perag_grab(mp, *agno); 280 if (pag) 281 return pag; 282 (*agno)++; 283 } 284 return NULL; 285 } 286 287 /* 288 * Iterate all AGs from start_agno through wrap_agno, then restart_agno through 289 * (start_agno - 1). 290 */ 291 #define for_each_perag_wrap_range(mp, start_agno, restart_agno, wrap_agno, agno, pag) \ 292 for ((agno) = (start_agno), (pag) = xfs_perag_grab((mp), (agno)); \ 293 (pag) != NULL; \ 294 (pag) = xfs_perag_next_wrap((pag), &(agno), (start_agno), \ 295 (restart_agno), (wrap_agno))) 296 /* 297 * Iterate all AGs from start_agno through wrap_agno, then 0 through 298 * (start_agno - 1). 299 */ 300 #define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) \ 301 for_each_perag_wrap_range((mp), (start_agno), 0, (wrap_agno), (agno), (pag)) 302 303 /* 304 * Iterate all AGs from start_agno through to the end of the filesystem, then 0 305 * through (start_agno - 1). 306 */ 307 #define for_each_perag_wrap(mp, start_agno, agno, pag) \ 308 for_each_perag_wrap_at((mp), (start_agno), (mp)->m_sb.sb_agcount, \ 309 (agno), (pag)) 310 311 312 struct aghdr_init_data { 313 /* per ag data */ 314 xfs_agblock_t agno; /* ag to init */ 315 xfs_extlen_t agsize; /* new AG size */ 316 struct list_head buffer_list; /* buffer writeback list */ 317 xfs_rfsblock_t nfree; /* cumulative new free space */ 318 319 /* per header data */ 320 xfs_daddr_t daddr; /* header location */ 321 size_t numblks; /* size of header */ 322 xfs_btnum_t type; /* type of btree root block */ 323 }; 324 325 int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id); 326 int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp, 327 xfs_extlen_t delta); 328 int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp, 329 xfs_extlen_t len); 330 int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo); 331 332 #endif /* __LIBXFS_AG_H */ 333