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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_REFCOUNT_ITEM_H__7#define __XFS_REFCOUNT_ITEM_H__8 9/*10 * There are (currently) two pairs of refcount btree redo item types:11 * increase and decrease. The log items for these are CUI (refcount12 * update intent) and CUD (refcount update done). The redo item type13 * is encoded in the 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 same17 * transaction that records the associated refcountbt updates.18 *19 * Should the system crash after the commit of the first transaction20 * but before the commit of the final transaction in a series, log21 * recovery will use the redo information recorded by the intent items22 * to replay the refcountbt metadata updates.23 */24 25/* kernel only CUI/CUD definitions */26 27struct xfs_mount;28struct kmem_cache;29 30/*31 * Max number of extents in fast allocation path.32 */33#define XFS_CUI_MAX_FAST_EXTENTS 1634 35/*36 * This is the "refcount update intent" log item. It is used to log37 * the fact that some reverse mappings need to change. It is used in38 * conjunction with the "refcount update done" log item described39 * below.40 *41 * These log items follow the same rules as struct xfs_efi_log_item;42 * see the comments about that structure (in xfs_extfree_item.h) for43 * more details.44 */45struct xfs_cui_log_item {46 struct xfs_log_item cui_item;47 atomic_t cui_refcount;48 atomic_t cui_next_extent;49 struct xfs_cui_log_format cui_format;50};51 52static inline size_t53xfs_cui_log_item_sizeof(54 unsigned int nr)55{56 return offsetof(struct xfs_cui_log_item, cui_format) +57 xfs_cui_log_format_sizeof(nr);58}59 60/*61 * This is the "refcount update done" log item. It is used to log the62 * fact that some refcountbt updates mentioned in an earlier cui item63 * have been performed.64 */65struct xfs_cud_log_item {66 struct xfs_log_item cud_item;67 struct xfs_cui_log_item *cud_cuip;68 struct xfs_cud_log_format cud_format;69};70 71extern struct kmem_cache *xfs_cui_cache;72extern struct kmem_cache *xfs_cud_cache;73 74struct xfs_refcount_intent;75 76void xfs_refcount_defer_add(struct xfs_trans *tp,77 struct xfs_refcount_intent *ri);78 79#endif /* __XFS_REFCOUNT_ITEM_H__ */80