87 lines
2.6 KiB
C
87 lines
2.6 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_REFCOUNT_ITEM_H__
|
|
#define __XFS_REFCOUNT_ITEM_H__
|
|
|
|
/*
|
|
* There are (currently) two pairs of refcount btree redo item types:
|
|
* increase and decrease. The log items for these are CUI (refcount
|
|
* update intent) and CUD (refcount 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 refcountbt 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 refcountbt metadata updates.
|
|
*/
|
|
|
|
/* kernel only CUI/CUD definitions */
|
|
|
|
struct xfs_mount;
|
|
struct kmem_zone;
|
|
|
|
/*
|
|
* Max number of extents in fast allocation path.
|
|
*/
|
|
#define XFS_CUI_MAX_FAST_EXTENTS 16
|
|
|
|
/*
|
|
* Define CUI flag bits. Manipulated by set/clear/test_bit operators.
|
|
*/
|
|
#define XFS_CUI_RECOVERED 1
|
|
|
|
/*
|
|
* This is the "refcount 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 "refcount 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_cui_log_item {
|
|
struct xfs_log_item cui_item;
|
|
atomic_t cui_refcount;
|
|
atomic_t cui_next_extent;
|
|
unsigned long cui_flags; /* misc flags */
|
|
struct xfs_cui_log_format cui_format;
|
|
};
|
|
|
|
static inline size_t
|
|
xfs_cui_log_item_sizeof(
|
|
unsigned int nr)
|
|
{
|
|
return offsetof(struct xfs_cui_log_item, cui_format) +
|
|
xfs_cui_log_format_sizeof(nr);
|
|
}
|
|
|
|
/*
|
|
* This is the "refcount update done" log item. It is used to log the
|
|
* fact that some refcountbt updates mentioned in an earlier cui item
|
|
* have been performed.
|
|
*/
|
|
struct xfs_cud_log_item {
|
|
struct xfs_log_item cud_item;
|
|
struct xfs_cui_log_item *cud_cuip;
|
|
struct xfs_cud_log_format cud_format;
|
|
};
|
|
|
|
extern struct kmem_zone *xfs_cui_zone;
|
|
extern struct kmem_zone *xfs_cud_zone;
|
|
|
|
struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint);
|
|
void xfs_cui_item_free(struct xfs_cui_log_item *);
|
|
void xfs_cui_release(struct xfs_cui_log_item *);
|
|
int xfs_cui_recover(struct xfs_cui_log_item *cuip,
|
|
struct list_head *capture_list);
|
|
|
|
#endif /* __XFS_REFCOUNT_ITEM_H__ */
|