Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2016 Oracle.  All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Author: Darrick J. Wong <darrick.wong@oracle.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #ifndef	__XFS_BMAP_ITEM_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #define	__XFS_BMAP_ITEM_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * There are (currently) two pairs of bmap btree redo item types: map & unmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * The common abbreviations for these are BUI (bmap update intent) and BUD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * (bmap update done).  The redo item type is encoded in the flags field of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * each xfs_map_extent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * *I items should be recorded in the *first* of a series of rolled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * transactions, and the *D items should be recorded in the same transaction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * that records the associated bmbt updates.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * Should the system crash after the commit of the first transaction but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * before the commit of the final transaction in a series, log recovery will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * use the redo information recorded by the intent items to replay the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * bmbt metadata updates in the non-first transaction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* kernel only BUI/BUD definitions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct xfs_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct kmem_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  * Max number of extents in fast allocation path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define	XFS_BUI_MAX_FAST_EXTENTS	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)  * This is the "bmap update intent" log item.  It is used to log the fact that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  * some reverse mappings need to change.  It is used in conjunction with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  * "bmap update done" log item described below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  * These log items follow the same rules as struct xfs_efi_log_item; see the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  * comments about that structure (in xfs_extfree_item.h) for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct xfs_bui_log_item {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	struct xfs_log_item		bui_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	atomic_t			bui_refcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	atomic_t			bui_next_extent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	struct xfs_bui_log_format	bui_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static inline size_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) xfs_bui_log_item_sizeof(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	unsigned int		nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	return offsetof(struct xfs_bui_log_item, bui_format) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 			xfs_bui_log_format_sizeof(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)  * This is the "bmap update done" log item.  It is used to log the fact that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)  * some bmbt updates mentioned in an earlier bui item have been performed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct xfs_bud_log_item {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	struct xfs_log_item		bud_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	struct xfs_bui_log_item		*bud_buip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	struct xfs_bud_log_format	bud_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) extern struct kmem_zone	*xfs_bui_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) extern struct kmem_zone	*xfs_bud_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #endif	/* __XFS_BMAP_ITEM_H__ */