1*baf4bcacSDarrick J. Wong /* 2*baf4bcacSDarrick J. Wong * Copyright (C) 2016 Oracle. All Rights Reserved. 3*baf4bcacSDarrick J. Wong * 4*baf4bcacSDarrick J. Wong * Author: Darrick J. Wong <darrick.wong@oracle.com> 5*baf4bcacSDarrick J. Wong * 6*baf4bcacSDarrick J. Wong * This program is free software; you can redistribute it and/or 7*baf4bcacSDarrick J. Wong * modify it under the terms of the GNU General Public License 8*baf4bcacSDarrick J. Wong * as published by the Free Software Foundation; either version 2 9*baf4bcacSDarrick J. Wong * of the License, or (at your option) any later version. 10*baf4bcacSDarrick J. Wong * 11*baf4bcacSDarrick J. Wong * This program is distributed in the hope that it would be useful, 12*baf4bcacSDarrick J. Wong * but WITHOUT ANY WARRANTY; without even the implied warranty of 13*baf4bcacSDarrick J. Wong * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*baf4bcacSDarrick J. Wong * GNU General Public License for more details. 15*baf4bcacSDarrick J. Wong * 16*baf4bcacSDarrick J. Wong * You should have received a copy of the GNU General Public License 17*baf4bcacSDarrick J. Wong * along with this program; if not, write the Free Software Foundation, 18*baf4bcacSDarrick J. Wong * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 19*baf4bcacSDarrick J. Wong */ 20*baf4bcacSDarrick J. Wong #ifndef __XFS_REFCOUNT_ITEM_H__ 21*baf4bcacSDarrick J. Wong #define __XFS_REFCOUNT_ITEM_H__ 22*baf4bcacSDarrick J. Wong 23*baf4bcacSDarrick J. Wong /* 24*baf4bcacSDarrick J. Wong * There are (currently) two pairs of refcount btree redo item types: 25*baf4bcacSDarrick J. Wong * increase and decrease. The log items for these are CUI (refcount 26*baf4bcacSDarrick J. Wong * update intent) and CUD (refcount update done). The redo item type 27*baf4bcacSDarrick J. Wong * is encoded in the flags field of each xfs_map_extent. 28*baf4bcacSDarrick J. Wong * 29*baf4bcacSDarrick J. Wong * *I items should be recorded in the *first* of a series of rolled 30*baf4bcacSDarrick J. Wong * transactions, and the *D items should be recorded in the same 31*baf4bcacSDarrick J. Wong * transaction that records the associated refcountbt updates. 32*baf4bcacSDarrick J. Wong * 33*baf4bcacSDarrick J. Wong * Should the system crash after the commit of the first transaction 34*baf4bcacSDarrick J. Wong * but before the commit of the final transaction in a series, log 35*baf4bcacSDarrick J. Wong * recovery will use the redo information recorded by the intent items 36*baf4bcacSDarrick J. Wong * to replay the refcountbt metadata updates. 37*baf4bcacSDarrick J. Wong */ 38*baf4bcacSDarrick J. Wong 39*baf4bcacSDarrick J. Wong /* kernel only CUI/CUD definitions */ 40*baf4bcacSDarrick J. Wong 41*baf4bcacSDarrick J. Wong struct xfs_mount; 42*baf4bcacSDarrick J. Wong struct kmem_zone; 43*baf4bcacSDarrick J. Wong 44*baf4bcacSDarrick J. Wong /* 45*baf4bcacSDarrick J. Wong * Max number of extents in fast allocation path. 46*baf4bcacSDarrick J. Wong */ 47*baf4bcacSDarrick J. Wong #define XFS_CUI_MAX_FAST_EXTENTS 16 48*baf4bcacSDarrick J. Wong 49*baf4bcacSDarrick J. Wong /* 50*baf4bcacSDarrick J. Wong * Define CUI flag bits. Manipulated by set/clear/test_bit operators. 51*baf4bcacSDarrick J. Wong */ 52*baf4bcacSDarrick J. Wong #define XFS_CUI_RECOVERED 1 53*baf4bcacSDarrick J. Wong 54*baf4bcacSDarrick J. Wong /* 55*baf4bcacSDarrick J. Wong * This is the "refcount update intent" log item. It is used to log 56*baf4bcacSDarrick J. Wong * the fact that some reverse mappings need to change. It is used in 57*baf4bcacSDarrick J. Wong * conjunction with the "refcount update done" log item described 58*baf4bcacSDarrick J. Wong * below. 59*baf4bcacSDarrick J. Wong * 60*baf4bcacSDarrick J. Wong * These log items follow the same rules as struct xfs_efi_log_item; 61*baf4bcacSDarrick J. Wong * see the comments about that structure (in xfs_extfree_item.h) for 62*baf4bcacSDarrick J. Wong * more details. 63*baf4bcacSDarrick J. Wong */ 64*baf4bcacSDarrick J. Wong struct xfs_cui_log_item { 65*baf4bcacSDarrick J. Wong struct xfs_log_item cui_item; 66*baf4bcacSDarrick J. Wong atomic_t cui_refcount; 67*baf4bcacSDarrick J. Wong atomic_t cui_next_extent; 68*baf4bcacSDarrick J. Wong unsigned long cui_flags; /* misc flags */ 69*baf4bcacSDarrick J. Wong struct xfs_cui_log_format cui_format; 70*baf4bcacSDarrick J. Wong }; 71*baf4bcacSDarrick J. Wong 72*baf4bcacSDarrick J. Wong static inline size_t 73*baf4bcacSDarrick J. Wong xfs_cui_log_item_sizeof( 74*baf4bcacSDarrick J. Wong unsigned int nr) 75*baf4bcacSDarrick J. Wong { 76*baf4bcacSDarrick J. Wong return offsetof(struct xfs_cui_log_item, cui_format) + 77*baf4bcacSDarrick J. Wong xfs_cui_log_format_sizeof(nr); 78*baf4bcacSDarrick J. Wong } 79*baf4bcacSDarrick J. Wong 80*baf4bcacSDarrick J. Wong /* 81*baf4bcacSDarrick J. Wong * This is the "refcount update done" log item. It is used to log the 82*baf4bcacSDarrick J. Wong * fact that some refcountbt updates mentioned in an earlier cui item 83*baf4bcacSDarrick J. Wong * have been performed. 84*baf4bcacSDarrick J. Wong */ 85*baf4bcacSDarrick J. Wong struct xfs_cud_log_item { 86*baf4bcacSDarrick J. Wong struct xfs_log_item cud_item; 87*baf4bcacSDarrick J. Wong struct xfs_cui_log_item *cud_cuip; 88*baf4bcacSDarrick J. Wong struct xfs_cud_log_format cud_format; 89*baf4bcacSDarrick J. Wong }; 90*baf4bcacSDarrick J. Wong 91*baf4bcacSDarrick J. Wong extern struct kmem_zone *xfs_cui_zone; 92*baf4bcacSDarrick J. Wong extern struct kmem_zone *xfs_cud_zone; 93*baf4bcacSDarrick J. Wong 94*baf4bcacSDarrick J. Wong struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint); 95*baf4bcacSDarrick J. Wong struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *, 96*baf4bcacSDarrick J. Wong struct xfs_cui_log_item *); 97*baf4bcacSDarrick J. Wong void xfs_cui_item_free(struct xfs_cui_log_item *); 98*baf4bcacSDarrick J. Wong void xfs_cui_release(struct xfs_cui_log_item *); 99*baf4bcacSDarrick J. Wong 100*baf4bcacSDarrick J. Wong #endif /* __XFS_REFCOUNT_ITEM_H__ */ 101