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966ceafc7a
Now that we've created the skeleton of a log intent item to track and restart file mapping exchange operations, add the upper level logic to commit intent items and turn them into concrete work recorded in the log. This builds on the existing bmap update intent items that have been around for a while now. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
65 lines
2 KiB
C
65 lines
2 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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