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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (c) 2020-2024 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#ifndef __XFS_EXCHMAPS_ITEM_H__
#define __XFS_EXCHMAPS_ITEM_H__
/*
* The file mapping exchange intent item helps us exchange multiple file
* mappings between two inode forks. It does this by tracking the range of
* file block offsets that still need to be exchanged, 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 mapping exchanges.
*/
/* kernel only XMI/XMD definitions */
struct xfs_mount;
struct kmem_cache;
/*
* This is the incore file mapping exchange intent log item. It is used to log
* the fact that we are exchanging mappings between two files. It is used in
* conjunction with the incore file mapping exchange 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_xmi_log_item {
struct xfs_log_item xmi_item;
atomic_t xmi_refcount;
struct xfs_xmi_log_format xmi_format;
};
/*
* This is the incore file mapping exchange done log item. It is used to log
* the fact that an exchange mentioned in an earlier xmi item have been
* performed.
*/
struct xfs_xmd_log_item {
struct xfs_log_item xmd_item;
struct xfs_xmi_log_item *xmd_intent_log_item;
struct xfs_xmd_log_format xmd_format;
};
extern struct kmem_cache *xfs_xmi_cache;
extern struct kmem_cache *xfs_xmd_cache;
struct xfs_exchmaps_intent;
void xfs_exchmaps_defer_add(struct xfs_trans *tp,
struct xfs_exchmaps_intent *xmi);
#endif /* __XFS_EXCHMAPS_ITEM_H__ */
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