mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 20:22:09 +00:00
8028411585
Move the code that adds the incore xfs_bmap_item deferred work data to a transaction live with the BUI log item code. This means that the file mapping code no longer has to know about the inner workings of the BUI log items. As a consequence, we can hide the _get_group helper. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2016 Oracle. All Rights Reserved.
|
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
|
*/
|
|
#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_cache;
|
|
|
|
/*
|
|
* Max number of extents in fast allocation path.
|
|
*/
|
|
#define XFS_BUI_MAX_FAST_EXTENTS 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;
|
|
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_cache *xfs_bui_cache;
|
|
extern struct kmem_cache *xfs_bud_cache;
|
|
|
|
struct xfs_bmap_intent;
|
|
|
|
void xfs_bmap_defer_add(struct xfs_trans *tp, struct xfs_bmap_intent *bi);
|
|
|
|
#endif /* __XFS_BMAP_ITEM_H__ */
|