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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2020 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_SWAPEXT_ITEM_H__
#define __XFS_SWAPEXT_ITEM_H__
/*
* The extent swapping intent item help us perform atomic extent swaps between
* two inode forks. It does this by tracking the range of logical offsets that
* still need to be swapped, and relogs as progress happens.
*
* *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
* rest of the extent swaps.
*/
/* kernel only SXI/SXD definitions */
struct xfs_mount;
struct kmem_zone;
/*
* Max number of extents in fast allocation path.
*/
#define XFS_SXI_MAX_FAST_EXTENTS 1
/*
* This is the "swapext update intent" log item. It is used to log the fact
* that we are swapping extents between two files. It is used in conjunction
* with the "swapext 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_sxi_log_item {
struct xfs_log_item sxi_item;
atomic_t sxi_refcount;
struct xfs_sxi_log_format sxi_format;
};
/*
* This is the "swapext update done" log item. It is used to log the fact that
* some extent swapping mentioned in an earlier sxi item have been performed.
*/
struct xfs_sxd_log_item {
struct xfs_log_item sxd_item;
struct xfs_sxi_log_item *sxd_intent_log_item;
struct xfs_sxd_log_format sxd_format;
};
extern struct kmem_zone *xfs_sxi_zone;
extern struct kmem_zone *xfs_sxd_zone;
#endif /* __XFS_SWAPEXT_ITEM_H__ */
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