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linux
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xfs_ag.h
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Darrick J. Wong
Merge tag 'inode-walk-cleanups-5.14_2021-06-03' of
https://git.kernel…
Jun 8, 2021
ffc1858
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Jun 8, 2021
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170 lines (142 loc) · 5.76 KB
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/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2018 Red Hat, Inc. * All rights reserved. */ #ifndef __LIBXFS_AG_H #define __LIBXFS_AG_H 1 struct xfs_mount; struct xfs_trans; struct xfs_perag; /* * Per-ag infrastructure */ /* per-AG block reservation data structures*/ struct xfs_ag_resv { /* number of blocks originally reserved here */ xfs_extlen_t ar_orig_reserved; /* number of blocks reserved here */ xfs_extlen_t ar_reserved; /* number of blocks originally asked for */ xfs_extlen_t ar_asked; }; /* * Per-ag incore structure, copies of information in agf and agi, to improve the * performance of allocation group selection. */ struct xfs_perag { struct xfs_mount *pag_mount; /* owner filesystem */ xfs_agnumber_t pag_agno; /* AG this structure belongs to */ atomic_t pag_ref; /* perag reference count */ char pagf_init; /* this agf's entry is initialized */ char pagi_init; /* this agi's entry is initialized */ char pagf_metadata; /* the agf is preferred to be metadata */ char pagi_inodeok; /* The agi is ok for inodes */ uint8_t pagf_levels[XFS_BTNUM_AGF]; /* # of levels in bno & cnt btree */ bool pagf_agflreset; /* agfl requires reset before use */ uint32_t pagf_flcount; /* count of blocks in freelist */ xfs_extlen_t pagf_freeblks; /* total free blocks */ xfs_extlen_t pagf_longest; /* longest free space */ uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ xfs_agino_t pagi_freecount; /* number of free inodes */ xfs_agino_t pagi_count; /* number of allocated inodes */ /* * Inode allocation search lookup optimisation. * If the pagino matches, the search for new inodes * doesn't need to search the near ones again straight away */ xfs_agino_t pagl_pagino; xfs_agino_t pagl_leftrec; xfs_agino_t pagl_rightrec; int pagb_count; /* pagb slots in use */ uint8_t pagf_refcount_level; /* recount btree height */ /* Blocks reserved for all kinds of metadata. */ struct xfs_ag_resv pag_meta_resv; /* Blocks reserved for the reverse mapping btree. */ struct xfs_ag_resv pag_rmapbt_resv; /* -- kernel only structures below this line -- */ /* * Bitsets of per-ag metadata that have been checked and/or are sick. * Callers should hold pag_state_lock before accessing this field. */ uint16_t pag_checked; uint16_t pag_sick; spinlock_t pag_state_lock; spinlock_t pagb_lock; /* lock for pagb_tree */ struct rb_root pagb_tree; /* ordered tree of busy extents */ unsigned int pagb_gen; /* generation count for pagb_tree */ wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */ atomic_t pagf_fstrms; /* # of filestreams active in this AG */ spinlock_t pag_ici_lock; /* incore inode cache lock */ struct radix_tree_root pag_ici_root; /* incore inode cache root */ int pag_ici_reclaimable; /* reclaimable inodes */ unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ /* buffer cache index */ spinlock_t pag_buf_lock; /* lock for pag_buf_hash */ struct rhashtable pag_buf_hash; /* for rcu-safe freeing */ struct rcu_head rcu_head; /* background prealloc block trimming */ struct delayed_work pag_blockgc_work; /* * Unlinked inode information. This incore information reflects * data stored in the AGI, so callers must hold the AGI buffer lock * or have some other means to control concurrency. */ struct rhashtable pagi_unlinked_hash; }; int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount, xfs_agnumber_t *maxagi); int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); void xfs_free_perag(struct xfs_mount *mp); struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno); struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno, unsigned int tag); void xfs_perag_put(struct xfs_perag *pag); /* * Perag iteration APIs * * XXX: for_each_perag_range() usage really needs an iterator to clean up when * we terminate at end_agno because we may have taken a reference to the perag * beyond end_agno. Right now callers have to be careful to catch and clean that * up themselves. This is not necessary for the callers of for_each_perag() and * for_each_perag_from() because they terminate at sb_agcount where there are * no perag structures in tree beyond end_agno. */ #define for_each_perag_range(mp, next_agno, end_agno, pag) \ for ((pag) = xfs_perag_get((mp), (next_agno)); \ (pag) != NULL && (next_agno) <= (end_agno); \ (next_agno) = (pag)->pag_agno + 1, \ xfs_perag_put(pag), \ (pag) = xfs_perag_get((mp), (next_agno))) #define for_each_perag_from(mp, next_agno, pag) \ for_each_perag_range((mp), (next_agno), (mp)->m_sb.sb_agcount, (pag)) #define for_each_perag(mp, agno, pag) \ (agno) = 0; \ for_each_perag_from((mp), (agno), (pag)) #define for_each_perag_tag(mp, agno, pag, tag) \ for ((agno) = 0, (pag) = xfs_perag_get_tag((mp), 0, (tag)); \ (pag) != NULL; \ (agno) = (pag)->pag_agno + 1, \ xfs_perag_put(pag), \ (pag) = xfs_perag_get_tag((mp), (agno), (tag))) struct aghdr_init_data { /* per ag data */ xfs_agblock_t agno; /* ag to init */ xfs_extlen_t agsize; /* new AG size */ struct list_head buffer_list; /* buffer writeback list */ xfs_rfsblock_t nfree; /* cumulative new free space */ /* per header data */ xfs_daddr_t daddr; /* header location */ size_t numblks; /* size of header */ xfs_btnum_t type; /* type of btree root block */ }; int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id); int xfs_ag_shrink_space(struct xfs_mount *mp, struct xfs_trans **tpp, xfs_agnumber_t agno, xfs_extlen_t delta); int xfs_ag_extend_space(struct xfs_mount *mp, struct xfs_trans *tp, struct aghdr_init_data *id, xfs_extlen_t len); int xfs_ag_get_geometry(struct xfs_mount *mp, xfs_agnumber_t agno, struct xfs_ag_geometry *ageo); #endif /* __LIBXFS_AG_H */
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