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; /* perag reference count */ 36 char pagf_init; /* this agf's entry is initialized */ 37 char pagi_init; /* this agi's entry is initialized */ 38 char pagf_metadata; /* the agf is preferred to be metadata */ 39 char pagi_inodeok; /* The agi is ok for inodes */ 40 uint8_t pagf_levels[XFS_BTNUM_AGF]; 41 /* # of levels in bno & cnt btree */ 42 bool pagf_agflreset; /* agfl requires reset before use */ 43 uint32_t pagf_flcount; /* count of blocks in freelist */ 44 xfs_extlen_t pagf_freeblks; /* total free blocks */ 45 xfs_extlen_t pagf_longest; /* longest free space */ 46 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ 47 xfs_agino_t pagi_freecount; /* number of free inodes */ 48 xfs_agino_t pagi_count; /* number of allocated inodes */ 49 50 /* 51 * Inode allocation search lookup optimisation. 52 * If the pagino matches, the search for new inodes 53 * doesn't need to search the near ones again straight away 54 */ 55 xfs_agino_t pagl_pagino; 56 xfs_agino_t pagl_leftrec; 57 xfs_agino_t pagl_rightrec; 58 59 int pagb_count; /* pagb slots in use */ 60 uint8_t pagf_refcount_level; /* recount btree height */ 61 62 /* Blocks reserved for all kinds of metadata. */ 63 struct xfs_ag_resv pag_meta_resv; 64 /* Blocks reserved for the reverse mapping btree. */ 65 struct xfs_ag_resv pag_rmapbt_resv; 66 67 /* -- kernel only structures below this line -- */ 68 69 /* 70 * Bitsets of per-ag metadata that have been checked and/or are sick. 71 * Callers should hold pag_state_lock before accessing this field. 72 */ 73 uint16_t pag_checked; 74 uint16_t pag_sick; 75 spinlock_t pag_state_lock; 76 77 spinlock_t pagb_lock; /* lock for pagb_tree */ 78 struct rb_root pagb_tree; /* ordered tree of busy extents */ 79 unsigned int pagb_gen; /* generation count for pagb_tree */ 80 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */ 81 82 atomic_t pagf_fstrms; /* # of filestreams active in this AG */ 83 84 spinlock_t pag_ici_lock; /* incore inode cache lock */ 85 struct radix_tree_root pag_ici_root; /* incore inode cache root */ 86 int pag_ici_reclaimable; /* reclaimable inodes */ 87 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ 88 89 /* buffer cache index */ 90 spinlock_t pag_buf_lock; /* lock for pag_buf_hash */ 91 struct rhashtable pag_buf_hash; 92 93 /* for rcu-safe freeing */ 94 struct rcu_head rcu_head; 95 96 /* background prealloc block trimming */ 97 struct delayed_work pag_blockgc_work; 98 99 /* 100 * Unlinked inode information. This incore information reflects 101 * data stored in the AGI, so callers must hold the AGI buffer lock 102 * or have some other means to control concurrency. 103 */ 104 struct rhashtable pagi_unlinked_hash; 105 }; 106 107 int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount, 108 xfs_agnumber_t *maxagi); 109 int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); 110 void xfs_free_perag(struct xfs_mount *mp); 111 112 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno); 113 struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno, 114 unsigned int tag); 115 void xfs_perag_put(struct xfs_perag *pag); 116 117 /* 118 * Perag iteration APIs 119 * 120 * XXX: for_each_perag_range() usage really needs an iterator to clean up when 121 * we terminate at end_agno because we may have taken a reference to the perag 122 * beyond end_agno. Right now callers have to be careful to catch and clean that 123 * up themselves. This is not necessary for the callers of for_each_perag() and 124 * for_each_perag_from() because they terminate at sb_agcount where there are 125 * no perag structures in tree beyond end_agno. 126 */ 127 #define for_each_perag_range(mp, next_agno, end_agno, pag) \ 128 for ((pag) = xfs_perag_get((mp), (next_agno)); \ 129 (pag) != NULL && (next_agno) <= (end_agno); \ 130 (next_agno) = (pag)->pag_agno + 1, \ 131 xfs_perag_put(pag), \ 132 (pag) = xfs_perag_get((mp), (next_agno))) 133 134 #define for_each_perag_from(mp, next_agno, pag) \ 135 for_each_perag_range((mp), (next_agno), (mp)->m_sb.sb_agcount, (pag)) 136 137 138 #define for_each_perag(mp, agno, pag) \ 139 (agno) = 0; \ 140 for_each_perag_from((mp), (agno), (pag)) 141 142 #define for_each_perag_tag(mp, agno, pag, tag) \ 143 for ((agno) = 0, (pag) = xfs_perag_get_tag((mp), 0, (tag)); \ 144 (pag) != NULL; \ 145 (agno) = (pag)->pag_agno + 1, \ 146 xfs_perag_put(pag), \ 147 (pag) = xfs_perag_get_tag((mp), (agno), (tag))) 148 149 struct aghdr_init_data { 150 /* per ag data */ 151 xfs_agblock_t agno; /* ag to init */ 152 xfs_extlen_t agsize; /* new AG size */ 153 struct list_head buffer_list; /* buffer writeback list */ 154 xfs_rfsblock_t nfree; /* cumulative new free space */ 155 156 /* per header data */ 157 xfs_daddr_t daddr; /* header location */ 158 size_t numblks; /* size of header */ 159 xfs_btnum_t type; /* type of btree root block */ 160 }; 161 162 int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id); 163 int xfs_ag_shrink_space(struct xfs_mount *mp, struct xfs_trans **tpp, 164 xfs_agnumber_t agno, xfs_extlen_t delta); 165 int xfs_ag_extend_space(struct xfs_mount *mp, struct xfs_trans *tp, 166 struct aghdr_init_data *id, xfs_extlen_t len); 167 int xfs_ag_get_geometry(struct xfs_mount *mp, xfs_agnumber_t agno, 168 struct xfs_ag_geometry *ageo); 169 170 #endif /* __LIBXFS_AG_H */ 171