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71 lines
2.2 KiB
71 lines
2.2 KiB
// 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 <[email protected]> |
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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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