mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 09:13:55 +08:00
77d61fe45e
Provide a mechanism for higher levels to create BUI/BUD items, submit them to the log, and a stub function to deal with recovered BUI items. These parts will be connected to the rmapbt in a later patch. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2016 Oracle. All Rights Reserved.
|
|
*
|
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
|
*
|
|
* 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__ */
|