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_BMAP_ITEM_H__ 7*4882a593Smuzhiyun #define __XFS_BMAP_ITEM_H__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * There are (currently) two pairs of bmap btree redo item types: map & unmap. 11*4882a593Smuzhiyun * The common abbreviations for these are BUI (bmap update intent) and BUD 12*4882a593Smuzhiyun * (bmap update done). The redo item type is encoded in the flags field of 13*4882a593Smuzhiyun * 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 bmbt updates. 18*4882a593Smuzhiyun * 19*4882a593Smuzhiyun * Should the system crash after the commit of the first transaction but 20*4882a593Smuzhiyun * before the commit of the final transaction in a series, log recovery will 21*4882a593Smuzhiyun * use the redo information recorded by the intent items to replay the 22*4882a593Smuzhiyun * bmbt metadata updates in the non-first transaction. 23*4882a593Smuzhiyun */ 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /* kernel only BUI/BUD definitions */ 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun struct xfs_mount; 28*4882a593Smuzhiyun struct kmem_zone; 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun /* 31*4882a593Smuzhiyun * Max number of extents in fast allocation path. 32*4882a593Smuzhiyun */ 33*4882a593Smuzhiyun #define XFS_BUI_MAX_FAST_EXTENTS 1 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun /* 36*4882a593Smuzhiyun * This is the "bmap update intent" log item. It is used to log the fact that 37*4882a593Smuzhiyun * some reverse mappings need to change. It is used in conjunction with the 38*4882a593Smuzhiyun * "bmap update done" log item described below. 39*4882a593Smuzhiyun * 40*4882a593Smuzhiyun * These log items follow the same rules as struct xfs_efi_log_item; see the 41*4882a593Smuzhiyun * comments about that structure (in xfs_extfree_item.h) for more details. 42*4882a593Smuzhiyun */ 43*4882a593Smuzhiyun struct xfs_bui_log_item { 44*4882a593Smuzhiyun struct xfs_log_item bui_item; 45*4882a593Smuzhiyun atomic_t bui_refcount; 46*4882a593Smuzhiyun atomic_t bui_next_extent; 47*4882a593Smuzhiyun struct xfs_bui_log_format bui_format; 48*4882a593Smuzhiyun }; 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun static inline size_t xfs_bui_log_item_sizeof(unsigned int nr)51*4882a593Smuzhiyunxfs_bui_log_item_sizeof( 52*4882a593Smuzhiyun unsigned int nr) 53*4882a593Smuzhiyun { 54*4882a593Smuzhiyun return offsetof(struct xfs_bui_log_item, bui_format) + 55*4882a593Smuzhiyun xfs_bui_log_format_sizeof(nr); 56*4882a593Smuzhiyun } 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun /* 59*4882a593Smuzhiyun * This is the "bmap update done" log item. It is used to log the fact that 60*4882a593Smuzhiyun * some bmbt updates mentioned in an earlier bui item have been performed. 61*4882a593Smuzhiyun */ 62*4882a593Smuzhiyun struct xfs_bud_log_item { 63*4882a593Smuzhiyun struct xfs_log_item bud_item; 64*4882a593Smuzhiyun struct xfs_bui_log_item *bud_buip; 65*4882a593Smuzhiyun struct xfs_bud_log_format bud_format; 66*4882a593Smuzhiyun }; 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun extern struct kmem_zone *xfs_bui_zone; 69*4882a593Smuzhiyun extern struct kmem_zone *xfs_bud_zone; 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun #endif /* __XFS_BMAP_ITEM_H__ */ 72