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TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_bmap_item.h

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  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 
 27 struct xfs_mount;
 28 struct kmem_zone;
 29 
 30 /*
 31  * Max number of extents in fast allocation path.
 32  */
 33 #define XFS_BUI_MAX_FAST_EXTENTS        1
 34 
 35 /*
 36  * Define BUI flag bits. Manipulated by set/clear/test_bit operators.
 37  */
 38 #define XFS_BUI_RECOVERED               1
 39 
 40 /*
 41  * This is the "bmap update intent" log item.  It is used to log the fact that
 42  * some reverse mappings need to change.  It is used in conjunction with the
 43  * "bmap update done" log item described below.
 44  *
 45  * These log items follow the same rules as struct xfs_efi_log_item; see the
 46  * comments about that structure (in xfs_extfree_item.h) for more details.
 47  */
 48 struct xfs_bui_log_item {
 49         struct xfs_log_item             bui_item;
 50         atomic_t                        bui_refcount;
 51         atomic_t                        bui_next_extent;
 52         unsigned long                   bui_flags;      /* misc flags */
 53         struct xfs_bui_log_format       bui_format;
 54 };
 55 
 56 static inline size_t
 57 xfs_bui_log_item_sizeof(
 58         unsigned int            nr)
 59 {
 60         return offsetof(struct xfs_bui_log_item, bui_format) +
 61                         xfs_bui_log_format_sizeof(nr);
 62 }
 63 
 64 /*
 65  * This is the "bmap update done" log item.  It is used to log the fact that
 66  * some bmbt updates mentioned in an earlier bui item have been performed.
 67  */
 68 struct xfs_bud_log_item {
 69         struct xfs_log_item             bud_item;
 70         struct xfs_bui_log_item         *bud_buip;
 71         struct xfs_bud_log_format       bud_format;
 72 };
 73 
 74 extern struct kmem_zone *xfs_bui_zone;
 75 extern struct kmem_zone *xfs_bud_zone;
 76 
 77 struct xfs_bui_log_item *xfs_bui_init(struct xfs_mount *);
 78 struct xfs_bud_log_item *xfs_bud_init(struct xfs_mount *,
 79                 struct xfs_bui_log_item *);
 80 void xfs_bui_item_free(struct xfs_bui_log_item *);
 81 void xfs_bui_release(struct xfs_bui_log_item *);
 82 int xfs_bui_recover(struct xfs_trans *parent_tp, struct xfs_bui_log_item *buip);
 83 
 84 #endif  /* __XFS_BMAP_ITEM_H__ */
 85 

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