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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_RMAP_ITEM_H__7#define __XFS_RMAP_ITEM_H__8 9/*10 * There are (currently) three pairs of rmap btree redo item types: map, unmap,11 * and convert. The common abbreviations for these are RUI (rmap update12 * intent) and RUD (rmap update done). The redo item type is encoded in the13 * flags field of 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 rmapbt updates. Typically, the first18 * transaction will record a bmbt update, followed by some number of19 * transactions containing rmapbt updates, and finally transactions with any20 * bnobt/cntbt updates.21 *22 * Should the system crash after the commit of the first transaction but23 * before the commit of the final transaction in a series, log recovery will24 * use the redo information recorded by the intent items to replay the25 * (rmapbt/bnobt/cntbt) metadata updates in the non-first transaction.26 */27 28/* kernel only RUI/RUD definitions */29 30struct xfs_mount;31struct kmem_cache;32 33/*34 * Max number of extents in fast allocation path.35 */36#define XFS_RUI_MAX_FAST_EXTENTS 1637 38/*39 * This is the "rmap update intent" log item. It is used to log the fact that40 * some reverse mappings need to change. It is used in conjunction with the41 * "rmap update done" log item described below.42 *43 * These log items follow the same rules as struct xfs_efi_log_item; see the44 * comments about that structure (in xfs_extfree_item.h) for more details.45 */46struct xfs_rui_log_item {47 struct xfs_log_item rui_item;48 atomic_t rui_refcount;49 atomic_t rui_next_extent;50 struct xfs_rui_log_format rui_format;51};52 53static inline size_t54xfs_rui_log_item_sizeof(55 unsigned int nr)56{57 return offsetof(struct xfs_rui_log_item, rui_format) +58 xfs_rui_log_format_sizeof(nr);59}60 61/*62 * This is the "rmap update done" log item. It is used to log the fact that63 * some rmapbt updates mentioned in an earlier rui item have been performed.64 */65struct xfs_rud_log_item {66 struct xfs_log_item rud_item;67 struct xfs_rui_log_item *rud_ruip;68 struct xfs_rud_log_format rud_format;69};70 71extern struct kmem_cache *xfs_rui_cache;72extern struct kmem_cache *xfs_rud_cache;73 74struct xfs_rmap_intent;75 76void xfs_rmap_defer_add(struct xfs_trans *tp, struct xfs_rmap_intent *ri);77 78#endif /* __XFS_RMAP_ITEM_H__ */79