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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Copyright (C) 2016 Oracle. All Rights Reserved.4 * Author: Darrick J. Wong <darrick.wong@oracle.com>5 */6#ifndef __XFS_BMAP_ITEM_H__7#define __XFS_BMAP_ITEM_H__8 9/*10 * There are (currently) two pairs of bmap btree redo item types: map & unmap.11 * The common abbreviations for these are BUI (bmap update intent) and BUD12 * (bmap update done). The redo item type is encoded in the flags field of13 * each xfs_map_extent.14 *15 * *I items should be recorded in the *first* of a series of rolled16 * transactions, and the *D items should be recorded in the same transaction17 * that records the associated bmbt updates.18 *19 * Should the system crash after the commit of the first transaction but20 * before the commit of the final transaction in a series, log recovery will21 * use the redo information recorded by the intent items to replay the22 * bmbt metadata updates in the non-first transaction.23 */24 25/* kernel only BUI/BUD definitions */26 27struct xfs_mount;28struct kmem_cache;29 30/*31 * Max number of extents in fast allocation path.32 */33#define XFS_BUI_MAX_FAST_EXTENTS 134 35/*36 * This is the "bmap update intent" log item. It is used to log the fact that37 * some reverse mappings need to change. It is used in conjunction with the38 * "bmap update done" log item described below.39 *40 * These log items follow the same rules as struct xfs_efi_log_item; see the41 * comments about that structure (in xfs_extfree_item.h) for more details.42 */43struct xfs_bui_log_item {44 struct xfs_log_item bui_item;45 atomic_t bui_refcount;46 atomic_t bui_next_extent;47 struct xfs_bui_log_format bui_format;48};49 50static inline size_t51xfs_bui_log_item_sizeof(52 unsigned int nr)53{54 return offsetof(struct xfs_bui_log_item, bui_format) +55 xfs_bui_log_format_sizeof(nr);56}57 58/*59 * This is the "bmap update done" log item. It is used to log the fact that60 * some bmbt updates mentioned in an earlier bui item have been performed.61 */62struct xfs_bud_log_item {63 struct xfs_log_item bud_item;64 struct xfs_bui_log_item *bud_buip;65 struct xfs_bud_log_format bud_format;66};67 68extern struct kmem_cache *xfs_bui_cache;69extern struct kmem_cache *xfs_bud_cache;70 71struct xfs_bmap_intent;72 73void xfs_bmap_defer_add(struct xfs_trans *tp, struct xfs_bmap_intent *bi);74 75#endif /* __XFS_BMAP_ITEM_H__ */76