87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __XFS_REFCOUNT_H__
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#define __XFS_REFCOUNT_H__
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extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur,
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xfs_agblock_t bno, int *stat);
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extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur,
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xfs_agblock_t bno, int *stat);
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extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur,
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struct xfs_refcount_irec *irec, int *stat);
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enum xfs_refcount_intent_type {
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XFS_REFCOUNT_INCREASE = 1,
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XFS_REFCOUNT_DECREASE,
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XFS_REFCOUNT_ALLOC_COW,
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XFS_REFCOUNT_FREE_COW,
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};
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struct xfs_refcount_intent {
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struct list_head ri_list;
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enum xfs_refcount_intent_type ri_type;
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xfs_fsblock_t ri_startblock;
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xfs_extlen_t ri_blockcount;
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};
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extern int xfs_refcount_increase_extent(struct xfs_mount *mp,
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struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec);
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extern int xfs_refcount_decrease_extent(struct xfs_mount *mp,
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struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec);
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extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp,
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struct xfs_btree_cur *rcur, int error);
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extern int xfs_refcount_finish_one(struct xfs_trans *tp,
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struct xfs_defer_ops *dfops, enum xfs_refcount_intent_type type,
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xfs_fsblock_t startblock, xfs_extlen_t blockcount,
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xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len,
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struct xfs_btree_cur **pcur);
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extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur,
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xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno,
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xfs_extlen_t *flen, bool find_end_of_shared);
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extern int xfs_refcount_alloc_cow_extent(struct xfs_mount *mp,
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struct xfs_defer_ops *dfops, xfs_fsblock_t fsb,
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xfs_extlen_t len);
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extern int xfs_refcount_free_cow_extent(struct xfs_mount *mp,
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struct xfs_defer_ops *dfops, xfs_fsblock_t fsb,
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xfs_extlen_t len);
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extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp,
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xfs_agnumber_t agno);
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/*
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* While we're adjusting the refcounts records of an extent, we have
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* to keep an eye on the number of extents we're dirtying -- run too
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* many in a single transaction and we'll exceed the transaction's
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* reservation and crash the fs. Each record adds 12 bytes to the
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* log (plus any key updates) so we'll conservatively assume 32 bytes
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* per record. We must also leave space for btree splits on both ends
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* of the range and space for the CUD and a new CUI.
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*/
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#define XFS_REFCOUNT_ITEM_OVERHEAD 32
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static inline xfs_fileoff_t xfs_refcount_max_unmap(int log_res)
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{
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return (log_res * 3 / 4) / XFS_REFCOUNT_ITEM_OVERHEAD;
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}
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#endif /* __XFS_REFCOUNT_H__ */
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