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Add selected helpers to estimate the transaction reservation required to write various log intent and buffer items to the log. These helpers will be used by the online repair code for more precise estimations of how much work can be done in a single transaction. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: John Garry <john.g.garry@oracle.com> Signed-off-by: John Garry <john.g.garry@oracle.com>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __XFS_REFCOUNT_ITEM_H__
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#define __XFS_REFCOUNT_ITEM_H__
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/*
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* There are (currently) two pairs of refcount btree redo item types:
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* increase and decrease. The log items for these are CUI (refcount
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* update intent) and CUD (refcount update done). The redo item type
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* is encoded in the flags field of each xfs_map_extent.
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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
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* transaction that records the associated refcountbt updates.
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*
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* Should the system crash after the commit of the first transaction
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* but before the commit of the final transaction in a series, log
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* recovery will use the redo information recorded by the intent items
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* to replay the refcountbt metadata updates.
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*/
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/* kernel only CUI/CUD definitions */
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struct xfs_mount;
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struct kmem_cache;
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/*
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* Max number of extents in fast allocation path.
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*/
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#define XFS_CUI_MAX_FAST_EXTENTS 16
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/*
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* This is the "refcount update intent" log item. It is used to log
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* the fact that some reverse mappings need to change. It is used in
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* conjunction with the "refcount update 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;
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* see the comments about that structure (in xfs_extfree_item.h) for
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* more details.
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*/
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struct xfs_cui_log_item {
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struct xfs_log_item cui_item;
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atomic_t cui_refcount;
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atomic_t cui_next_extent;
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struct xfs_cui_log_format cui_format;
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};
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static inline size_t
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xfs_cui_log_item_sizeof(
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unsigned int nr)
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{
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return offsetof(struct xfs_cui_log_item, cui_format) +
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xfs_cui_log_format_sizeof(nr);
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}
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/*
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* This is the "refcount update done" log item. It is used to log the
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* fact that some refcountbt updates mentioned in an earlier cui item
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* have been performed.
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*/
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struct xfs_cud_log_item {
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struct xfs_log_item cud_item;
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struct xfs_cui_log_item *cud_cuip;
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struct xfs_cud_log_format cud_format;
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};
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extern struct kmem_cache *xfs_cui_cache;
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extern struct kmem_cache *xfs_cud_cache;
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struct xfs_refcount_intent;
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void xfs_refcount_defer_add(struct xfs_trans *tp,
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struct xfs_refcount_intent *ri);
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unsigned int xfs_cui_log_space(unsigned int nr);
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unsigned int xfs_cud_log_space(void);
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#endif /* __XFS_REFCOUNT_ITEM_H__ */
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