linux/fs/xfs/xfs_refcount_item.h
Christoph Hellwig ebeb8e0629 xfs: merge xfs_cud_init into xfs_trans_get_cud
There is no good reason to keep these two functions separate.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-06-28 19:27:35 -07:00

86 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_trans *parent_tp, struct xfs_cui_log_item *cuip);
#endif /* __XFS_REFCOUNT_ITEM_H__ */