cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xfs_bmap_item.h (2205B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright (C) 2016 Oracle.  All Rights Reserved.
      4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
      5 */
      6#ifndef	__XFS_BMAP_ITEM_H__
      7#define	__XFS_BMAP_ITEM_H__
      8
      9/*
     10 * There are (currently) two pairs of bmap btree redo item types: map & unmap.
     11 * The common abbreviations for these are BUI (bmap update intent) and BUD
     12 * (bmap update done).  The redo item type is encoded in the flags field of
     13 * each xfs_map_extent.
     14 *
     15 * *I items should be recorded in the *first* of a series of rolled
     16 * transactions, and the *D items should be recorded in the same transaction
     17 * that records the associated bmbt updates.
     18 *
     19 * Should the system crash after the commit of the first transaction but
     20 * before the commit of the final transaction in a series, log recovery will
     21 * use the redo information recorded by the intent items to replay the
     22 * bmbt metadata updates in the non-first transaction.
     23 */
     24
     25/* kernel only BUI/BUD definitions */
     26
     27struct xfs_mount;
     28struct kmem_cache;
     29
     30/*
     31 * Max number of extents in fast allocation path.
     32 */
     33#define	XFS_BUI_MAX_FAST_EXTENTS	1
     34
     35/*
     36 * This is the "bmap update intent" log item.  It is used to log the fact that
     37 * some reverse mappings need to change.  It is used in conjunction with the
     38 * "bmap update done" log item described below.
     39 *
     40 * These log items follow the same rules as struct xfs_efi_log_item; see the
     41 * comments about that structure (in xfs_extfree_item.h) for more details.
     42 */
     43struct xfs_bui_log_item {
     44	struct xfs_log_item		bui_item;
     45	atomic_t			bui_refcount;
     46	atomic_t			bui_next_extent;
     47	struct xfs_bui_log_format	bui_format;
     48};
     49
     50static inline size_t
     51xfs_bui_log_item_sizeof(
     52	unsigned int		nr)
     53{
     54	return offsetof(struct xfs_bui_log_item, bui_format) +
     55			xfs_bui_log_format_sizeof(nr);
     56}
     57
     58/*
     59 * This is the "bmap update done" log item.  It is used to log the fact that
     60 * some bmbt updates mentioned in an earlier bui item have been performed.
     61 */
     62struct xfs_bud_log_item {
     63	struct xfs_log_item		bud_item;
     64	struct xfs_bui_log_item		*bud_buip;
     65	struct xfs_bud_log_format	bud_format;
     66};
     67
     68extern struct kmem_cache	*xfs_bui_cache;
     69extern struct kmem_cache	*xfs_bud_cache;
     70
     71#endif	/* __XFS_BMAP_ITEM_H__ */