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