| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2016 Oracle. All Rights Reserved. |
| * Author: Darrick J. Wong <darrick.wong@oracle.com> |
| */ |
| #ifndef __XFS_REFCOUNT_ITEM_H__ |
| #define __XFS_REFCOUNT_ITEM_H__ |
| |
| /* |
| * There are (currently) two pairs of refcount btree redo item types: |
| * increase and decrease. The log items for these are CUI (refcount |
| * update intent) and CUD (refcount update done). The redo item type |
| * is encoded in the flags field of each xfs_map_extent. |
| * |
| * *I items should be recorded in the *first* of a series of rolled |
| * transactions, and the *D items should be recorded in the same |
| * transaction that records the associated refcountbt updates. |
| * |
| * Should the system crash after the commit of the first transaction |
| * but before the commit of the final transaction in a series, log |
| * recovery will use the redo information recorded by the intent items |
| * to replay the refcountbt metadata updates. |
| */ |
| |
| /* kernel only CUI/CUD definitions */ |
| |
| struct xfs_mount; |
| struct kmem_zone; |
| |
| /* |
| * Max number of extents in fast allocation path. |
| */ |
| #define XFS_CUI_MAX_FAST_EXTENTS 16 |
| |
| /* |
| * Define CUI flag bits. Manipulated by set/clear/test_bit operators. |
| */ |
| #define XFS_CUI_RECOVERED 1 |
| |
| /* |
| * This is the "refcount update intent" log item. It is used to log |
| * the fact that some reverse mappings need to change. It is used in |
| * conjunction with the "refcount update done" log item described |
| * below. |
| * |
| * These log items follow the same rules as struct xfs_efi_log_item; |
| * see the comments about that structure (in xfs_extfree_item.h) for |
| * more details. |
| */ |
| struct xfs_cui_log_item { |
| struct xfs_log_item cui_item; |
| atomic_t cui_refcount; |
| atomic_t cui_next_extent; |
| unsigned long cui_flags; /* misc flags */ |
| struct xfs_cui_log_format cui_format; |
| }; |
| |
| static inline size_t |
| xfs_cui_log_item_sizeof( |
| unsigned int nr) |
| { |
| return offsetof(struct xfs_cui_log_item, cui_format) + |
| xfs_cui_log_format_sizeof(nr); |
| } |
| |
| /* |
| * This is the "refcount update done" log item. It is used to log the |
| * fact that some refcountbt updates mentioned in an earlier cui item |
| * have been performed. |
| */ |
| struct xfs_cud_log_item { |
| struct xfs_log_item cud_item; |
| struct xfs_cui_log_item *cud_cuip; |
| struct xfs_cud_log_format cud_format; |
| }; |
| |
| extern struct kmem_zone *xfs_cui_zone; |
| extern struct kmem_zone *xfs_cud_zone; |
| |
| struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint); |
| void xfs_cui_item_free(struct xfs_cui_log_item *); |
| void xfs_cui_release(struct xfs_cui_log_item *); |
| int xfs_cui_recover(struct xfs_cui_log_item *cuip, |
| struct list_head *capture_list); |
| |
| #endif /* __XFS_REFCOUNT_ITEM_H__ */ |