65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2020-2024 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <djwong@kernel.org>
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*/
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#ifndef __XFS_EXCHMAPS_ITEM_H__
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#define __XFS_EXCHMAPS_ITEM_H__
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/*
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* The file mapping exchange intent item helps us exchange multiple file
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* mappings between two inode forks. It does this by tracking the range of
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* file block offsets that still need to be exchanged, and relogs as progress
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* happens.
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*
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* *I items should be recorded in the *first* of a series of rolled
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* transactions, and the *D items should be recorded in the same transaction
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* that records the associated bmbt updates.
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*
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* Should the system crash after the commit of the first transaction but
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* before the commit of the final transaction in a series, log recovery will
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* use the redo information recorded by the intent items to replay the
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* rest of the mapping exchanges.
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*/
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/* kernel only XMI/XMD definitions */
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struct xfs_mount;
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struct kmem_cache;
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/*
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* This is the incore file mapping exchange intent log item. It is used to log
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* the fact that we are exchanging mappings between two files. It is used in
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* conjunction with the incore file mapping exchange done log item described
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* below.
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*
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* These log items follow the same rules as struct xfs_efi_log_item; see the
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* comments about that structure (in xfs_extfree_item.h) for more details.
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*/
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struct xfs_xmi_log_item {
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struct xfs_log_item xmi_item;
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atomic_t xmi_refcount;
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struct xfs_xmi_log_format xmi_format;
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};
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/*
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* This is the incore file mapping exchange done log item. It is used to log
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* the fact that an exchange mentioned in an earlier xmi item have been
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* performed.
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*/
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struct xfs_xmd_log_item {
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struct xfs_log_item xmd_item;
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struct xfs_xmi_log_item *xmd_intent_log_item;
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struct xfs_xmd_log_format xmd_format;
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};
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extern struct kmem_cache *xfs_xmi_cache;
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extern struct kmem_cache *xfs_xmd_cache;
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struct xfs_exchmaps_intent;
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void xfs_exchmaps_defer_add(struct xfs_trans *tp,
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struct xfs_exchmaps_intent *xmi);
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#endif /* __XFS_EXCHMAPS_ITEM_H__ */
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