103 строки
3.3 KiB
C
103 строки
3.3 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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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_zone;
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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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* Define CUI flag bits. Manipulated by set/clear/test_bit operators.
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*/
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#define XFS_CUI_RECOVERED 1
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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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unsigned long cui_flags; /* misc flags */
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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_zone *xfs_cui_zone;
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extern struct kmem_zone *xfs_cud_zone;
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struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint);
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struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *,
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struct xfs_cui_log_item *);
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void xfs_cui_item_free(struct xfs_cui_log_item *);
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void xfs_cui_release(struct xfs_cui_log_item *);
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int xfs_cui_recover(struct xfs_mount *mp, struct xfs_cui_log_item *cuip,
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struct xfs_defer_ops *dfops);
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#endif /* __XFS_REFCOUNT_ITEM_H__ */
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