1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2016 Oracle. All Rights Reserved. 4*4882a593Smuzhiyun * Author: Darrick J. Wong <darrick.wong@oracle.com> 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun #ifndef __XFS_RMAP_ITEM_H__ 7*4882a593Smuzhiyun #define __XFS_RMAP_ITEM_H__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * There are (currently) three pairs of rmap btree redo item types: map, unmap, 11*4882a593Smuzhiyun * and convert. The common abbreviations for these are RUI (rmap update 12*4882a593Smuzhiyun * intent) and RUD (rmap update done). The redo item type is encoded in the 13*4882a593Smuzhiyun * flags field of each xfs_map_extent. 14*4882a593Smuzhiyun * 15*4882a593Smuzhiyun * *I items should be recorded in the *first* of a series of rolled 16*4882a593Smuzhiyun * transactions, and the *D items should be recorded in the same transaction 17*4882a593Smuzhiyun * that records the associated rmapbt updates. Typically, the first 18*4882a593Smuzhiyun * transaction will record a bmbt update, followed by some number of 19*4882a593Smuzhiyun * transactions containing rmapbt updates, and finally transactions with any 20*4882a593Smuzhiyun * bnobt/cntbt updates. 21*4882a593Smuzhiyun * 22*4882a593Smuzhiyun * Should the system crash after the commit of the first transaction but 23*4882a593Smuzhiyun * before the commit of the final transaction in a series, log recovery will 24*4882a593Smuzhiyun * use the redo information recorded by the intent items to replay the 25*4882a593Smuzhiyun * (rmapbt/bnobt/cntbt) metadata updates in the non-first transaction. 26*4882a593Smuzhiyun */ 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun /* kernel only RUI/RUD definitions */ 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun struct xfs_mount; 31*4882a593Smuzhiyun struct kmem_zone; 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun /* 34*4882a593Smuzhiyun * Max number of extents in fast allocation path. 35*4882a593Smuzhiyun */ 36*4882a593Smuzhiyun #define XFS_RUI_MAX_FAST_EXTENTS 16 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun /* 39*4882a593Smuzhiyun * This is the "rmap update intent" log item. It is used to log the fact that 40*4882a593Smuzhiyun * some reverse mappings need to change. It is used in conjunction with the 41*4882a593Smuzhiyun * "rmap update done" log item described below. 42*4882a593Smuzhiyun * 43*4882a593Smuzhiyun * These log items follow the same rules as struct xfs_efi_log_item; see the 44*4882a593Smuzhiyun * comments about that structure (in xfs_extfree_item.h) for more details. 45*4882a593Smuzhiyun */ 46*4882a593Smuzhiyun struct xfs_rui_log_item { 47*4882a593Smuzhiyun struct xfs_log_item rui_item; 48*4882a593Smuzhiyun atomic_t rui_refcount; 49*4882a593Smuzhiyun atomic_t rui_next_extent; 50*4882a593Smuzhiyun struct xfs_rui_log_format rui_format; 51*4882a593Smuzhiyun }; 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun static inline size_t xfs_rui_log_item_sizeof(unsigned int nr)54*4882a593Smuzhiyunxfs_rui_log_item_sizeof( 55*4882a593Smuzhiyun unsigned int nr) 56*4882a593Smuzhiyun { 57*4882a593Smuzhiyun return offsetof(struct xfs_rui_log_item, rui_format) + 58*4882a593Smuzhiyun xfs_rui_log_format_sizeof(nr); 59*4882a593Smuzhiyun } 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun /* 62*4882a593Smuzhiyun * This is the "rmap update done" log item. It is used to log the fact that 63*4882a593Smuzhiyun * some rmapbt updates mentioned in an earlier rui item have been performed. 64*4882a593Smuzhiyun */ 65*4882a593Smuzhiyun struct xfs_rud_log_item { 66*4882a593Smuzhiyun struct xfs_log_item rud_item; 67*4882a593Smuzhiyun struct xfs_rui_log_item *rud_ruip; 68*4882a593Smuzhiyun struct xfs_rud_log_format rud_format; 69*4882a593Smuzhiyun }; 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun extern struct kmem_zone *xfs_rui_zone; 72*4882a593Smuzhiyun extern struct kmem_zone *xfs_rud_zone; 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun #endif /* __XFS_RMAP_ITEM_H__ */ 75