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xfs_bmap_item.h
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/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __XFS_BMAP_ITEM_H__
#define __XFS_BMAP_ITEM_H__
/*
* There are (currently) two pairs of bmap btree redo item types: map & unmap.
* The common abbreviations for these are BUI (bmap update intent) and BUD
* (bmap update done). The redo item type is encoded in the flags field of
* each xfs_map_extent.
*
* *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
* bmbt metadata updates in the non-first transaction.
*/
/* kernel only BUI/BUD definitions */
struct xfs_mount;
struct kmem_zone;
/*
* Max number of extents in fast allocation path.
*/
#define XFS_BUI_MAX_FAST_EXTENTS 1
/*
* Define BUI flag bits. Manipulated by set/clear/test_bit operators.
*/
#define XFS_BUI_RECOVERED 1
/*
* This is the "bmap update intent" log item. It is used to log the fact that
* some reverse mappings need to change. It is used in conjunction with the
* "bmap update 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_bui_log_item {
struct xfs_log_item bui_item;
atomic_t bui_refcount;
atomic_t bui_next_extent;
unsigned long bui_flags; /* misc flags */
struct xfs_bui_log_format bui_format;
};
static inline size_t
xfs_bui_log_item_sizeof(
unsigned int nr)
{
return offsetof(struct xfs_bui_log_item, bui_format) +
xfs_bui_log_format_sizeof(nr);
}
/*
* This is the "bmap update done" log item. It is used to log the fact that
* some bmbt updates mentioned in an earlier bui item have been performed.
*/
struct xfs_bud_log_item {
struct xfs_log_item bud_item;
struct xfs_bui_log_item *bud_buip;
struct xfs_bud_log_format bud_format;
};
extern struct kmem_zone *xfs_bui_zone;
extern struct kmem_zone *xfs_bud_zone;
struct xfs_bui_log_item *xfs_bui_init(struct xfs_mount *);
struct xfs_bud_log_item *xfs_bud_init(struct xfs_mount *,
struct xfs_bui_log_item *);
void xfs_bui_item_free(struct xfs_bui_log_item *);
void xfs_bui_release(struct xfs_bui_log_item *);
int xfs_bui_recover(struct xfs_mount *mp, struct xfs_bui_log_item *buip);
#endif /* __XFS_BMAP_ITEM_H__ */