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 void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart, 137 xfs_agnumber_t agend); 138 int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount, 139 xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi); 140 int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); 141 void xfs_free_perag(struct xfs_mount *mp); 142 143 /* Passive AG references */ 144 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno); 145 struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno, 146 unsigned int tag); 147 struct xfs_perag *xfs_perag_hold(struct xfs_perag *pag); 148 void xfs_perag_put(struct xfs_perag *pag); 149 150 /* Active AG references */ 151 struct xfs_perag *xfs_perag_grab(struct xfs_mount *, xfs_agnumber_t); 152 struct xfs_perag *xfs_perag_grab_tag(struct xfs_mount *, xfs_agnumber_t, 153 int tag); 154 void xfs_perag_rele(struct xfs_perag *pag); 155 156 /* 157 * Per-ag geometry infomation and validation 158 */ 159 xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno); 160 void xfs_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno, 161 xfs_agino_t *first, xfs_agino_t *last); 162 163 static inline bool 164 xfs_verify_agbno(struct xfs_perag *pag, xfs_agblock_t agbno) 165 { 166 if (agbno >= pag->block_count) 167 return false; 168 if (agbno <= pag->min_block) 169 return false; 170 return true; 171 } 172 173 static inline bool 174 xfs_verify_agbext( 175 struct xfs_perag *pag, 176 xfs_agblock_t agbno, 177 xfs_agblock_t len) 178 { 179 if (agbno + len <= agbno) 180 return false; 181 182 if (!xfs_verify_agbno(pag, agbno)) 183 return false; 184 185 return xfs_verify_agbno(pag, agbno + len - 1); 186 } 187 188 /* 189 * Verify that an AG inode number pointer neither points outside the AG 190 * nor points at static metadata. 191 */ 192 static inline bool 193 xfs_verify_agino(struct xfs_perag *pag, xfs_agino_t agino) 194 { 195 if (agino < pag->agino_min) 196 return false; 197 if (agino > pag->agino_max) 198 return false; 199 return true; 200 } 201 202 /* 203 * Verify that an AG inode number pointer neither points outside the AG 204 * nor points at static metadata, or is NULLAGINO. 205 */ 206 static inline bool 207 xfs_verify_agino_or_null(struct xfs_perag *pag, xfs_agino_t agino) 208 { 209 if (agino == NULLAGINO) 210 return true; 211 return xfs_verify_agino(pag, agino); 212 } 213 214 static inline bool 215 xfs_ag_contains_log(struct xfs_mount *mp, xfs_agnumber_t agno) 216 { 217 return mp->m_sb.sb_logstart > 0 && 218 agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart); 219 } 220 221 /* 222 * Perag iteration APIs 223 */ 224 static inline struct xfs_perag * 225 xfs_perag_next( 226 struct xfs_perag *pag, 227 xfs_agnumber_t *agno, 228 xfs_agnumber_t end_agno) 229 { 230 struct xfs_mount *mp = pag->pag_mount; 231 232 *agno = pag->pag_agno + 1; 233 xfs_perag_rele(pag); 234 while (*agno <= end_agno) { 235 pag = xfs_perag_grab(mp, *agno); 236 if (pag) 237 return pag; 238 (*agno)++; 239 } 240 return NULL; 241 } 242 243 #define for_each_perag_range(mp, agno, end_agno, pag) \ 244 for ((pag) = xfs_perag_grab((mp), (agno)); \ 245 (pag) != NULL; \ 246 (pag) = xfs_perag_next((pag), &(agno), (end_agno))) 247 248 #define for_each_perag_from(mp, agno, pag) \ 249 for_each_perag_range((mp), (agno), (mp)->m_sb.sb_agcount - 1, (pag)) 250 251 #define for_each_perag(mp, agno, pag) \ 252 (agno) = 0; \ 253 for_each_perag_from((mp), (agno), (pag)) 254 255 #define for_each_perag_tag(mp, agno, pag, tag) \ 256 for ((agno) = 0, (pag) = xfs_perag_grab_tag((mp), 0, (tag)); \ 257 (pag) != NULL; \ 258 (agno) = (pag)->pag_agno + 1, \ 259 xfs_perag_rele(pag), \ 260 (pag) = xfs_perag_grab_tag((mp), (agno), (tag))) 261 262 static inline struct xfs_perag * 263 xfs_perag_next_wrap( 264 struct xfs_perag *pag, 265 xfs_agnumber_t *agno, 266 xfs_agnumber_t stop_agno, 267 xfs_agnumber_t restart_agno, 268 xfs_agnumber_t wrap_agno) 269 { 270 struct xfs_mount *mp = pag->pag_mount; 271 272 *agno = pag->pag_agno + 1; 273 xfs_perag_rele(pag); 274 while (*agno != stop_agno) { 275 if (*agno >= wrap_agno) { 276 if (restart_agno >= stop_agno) 277 break; 278 *agno = restart_agno; 279 } 280 281 pag = xfs_perag_grab(mp, *agno); 282 if (pag) 283 return pag; 284 (*agno)++; 285 } 286 return NULL; 287 } 288 289 /* 290 * Iterate all AGs from start_agno through wrap_agno, then restart_agno through 291 * (start_agno - 1). 292 */ 293 #define for_each_perag_wrap_range(mp, start_agno, restart_agno, wrap_agno, agno, pag) \ 294 for ((agno) = (start_agno), (pag) = xfs_perag_grab((mp), (agno)); \ 295 (pag) != NULL; \ 296 (pag) = xfs_perag_next_wrap((pag), &(agno), (start_agno), \ 297 (restart_agno), (wrap_agno))) 298 /* 299 * Iterate all AGs from start_agno through wrap_agno, then 0 through 300 * (start_agno - 1). 301 */ 302 #define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) \ 303 for_each_perag_wrap_range((mp), (start_agno), 0, (wrap_agno), (agno), (pag)) 304 305 /* 306 * Iterate all AGs from start_agno through to the end of the filesystem, then 0 307 * through (start_agno - 1). 308 */ 309 #define for_each_perag_wrap(mp, start_agno, agno, pag) \ 310 for_each_perag_wrap_at((mp), (start_agno), (mp)->m_sb.sb_agcount, \ 311 (agno), (pag)) 312 313 314 struct aghdr_init_data { 315 /* per ag data */ 316 xfs_agblock_t agno; /* ag to init */ 317 xfs_extlen_t agsize; /* new AG size */ 318 struct list_head buffer_list; /* buffer writeback list */ 319 xfs_rfsblock_t nfree; /* cumulative new free space */ 320 321 /* per header data */ 322 xfs_daddr_t daddr; /* header location */ 323 size_t numblks; /* size of header */ 324 xfs_btnum_t type; /* type of btree root block */ 325 }; 326 327 int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id); 328 int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp, 329 xfs_extlen_t delta); 330 int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp, 331 xfs_extlen_t len); 332 int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo); 333 334 #endif /* __LIBXFS_AG_H */ 335