https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 9ebcfadb0610322ac537dd7aa5d9cbc2b2894c68 authored by Linus Torvalds on 28 June 2020, 22:00:24 UTC
Linux 5.8-rc3
Linux 5.8-rc3
Tip revision: 9ebcfad
xfs_bmap_item.h
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_BMAP_ITEM_H__
#define __XFS_BMAP_ITEM_H__
/*
* There are (currently) two pairs of bmap btree redo item types: map & unmap.
* The common abbreviations for these are BUI (bmap update intent) and BUD
* (bmap 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 bmbt 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
* bmbt metadata updates in the non-first transaction.
*/
/* kernel only BUI/BUD definitions */
struct xfs_mount;
struct kmem_zone;
/*
* Max number of extents in fast allocation path.
*/
#define XFS_BUI_MAX_FAST_EXTENTS 1
/*
* This is the "bmap 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
* "bmap 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_bui_log_item {
struct xfs_log_item bui_item;
atomic_t bui_refcount;
atomic_t bui_next_extent;
struct xfs_bui_log_format bui_format;
};
static inline size_t
xfs_bui_log_item_sizeof(
unsigned int nr)
{
return offsetof(struct xfs_bui_log_item, bui_format) +
xfs_bui_log_format_sizeof(nr);
}
/*
* This is the "bmap update done" log item. It is used to log the fact that
* some bmbt updates mentioned in an earlier bui item have been performed.
*/
struct xfs_bud_log_item {
struct xfs_log_item bud_item;
struct xfs_bui_log_item *bud_buip;
struct xfs_bud_log_format bud_format;
};
extern struct kmem_zone *xfs_bui_zone;
extern struct kmem_zone *xfs_bud_zone;
#endif /* __XFS_BMAP_ITEM_H__ */