72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __XFS_BMAP_ITEM_H__
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#define __XFS_BMAP_ITEM_H__
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/*
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* There are (currently) two pairs of bmap btree redo item types: map & unmap.
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* The common abbreviations for these are BUI (bmap update intent) and BUD
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* (bmap update done). The redo item type is encoded in the flags field of
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* each xfs_map_extent.
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*
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* *I items should be recorded in the *first* of a series of rolled
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* transactions, and the *D items should be recorded in the same transaction
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* that records the associated bmbt updates.
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*
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* Should the system crash after the commit of the first transaction but
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* before the commit of the final transaction in a series, log recovery will
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* use the redo information recorded by the intent items to replay the
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* bmbt metadata updates in the non-first transaction.
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*/
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/* kernel only BUI/BUD definitions */
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struct xfs_mount;
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struct kmem_cache;
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/*
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* Max number of extents in fast allocation path.
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*/
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#define XFS_BUI_MAX_FAST_EXTENTS 1
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/*
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* This is the "bmap update intent" log item. It is used to log the fact that
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* some reverse mappings need to change. It is used in conjunction with the
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* "bmap update done" log item described below.
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*
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* These log items follow the same rules as struct xfs_efi_log_item; see the
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* comments about that structure (in xfs_extfree_item.h) for more details.
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*/
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struct xfs_bui_log_item {
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struct xfs_log_item bui_item;
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atomic_t bui_refcount;
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atomic_t bui_next_extent;
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struct xfs_bui_log_format bui_format;
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};
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static inline size_t
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xfs_bui_log_item_sizeof(
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unsigned int nr)
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{
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return offsetof(struct xfs_bui_log_item, bui_format) +
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xfs_bui_log_format_sizeof(nr);
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}
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/*
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* This is the "bmap update done" log item. It is used to log the fact that
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* some bmbt updates mentioned in an earlier bui item have been performed.
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*/
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struct xfs_bud_log_item {
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struct xfs_log_item bud_item;
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struct xfs_bui_log_item *bud_buip;
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struct xfs_bud_log_format bud_format;
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};
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extern struct kmem_cache *xfs_bui_cache;
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extern struct kmem_cache *xfs_bud_cache;
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#endif /* __XFS_BMAP_ITEM_H__ */
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