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_REFCOUNT_ITEM_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #define	__XFS_REFCOUNT_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 refcount btree redo item types:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * increase and decrease.  The log items for these are CUI (refcount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * update intent) and CUD (refcount update done).  The redo item type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * is encoded in the flags field of 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
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * transaction that records the associated refcountbt 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
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * but before the commit of the final transaction in a series, log
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * recovery will use the redo information recorded by the intent items
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * to replay the refcountbt metadata updates.
^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 CUI/CUD 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_CUI_MAX_FAST_EXTENTS	16
^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 "refcount update intent" log item.  It is used to log
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  * the fact that some reverse mappings need to change.  It is used in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  * conjunction with the "refcount update done" log item described
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  * below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  * These log items follow the same rules as struct xfs_efi_log_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  * see the comments about that structure (in xfs_extfree_item.h) for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)  * more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct xfs_cui_log_item {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	struct xfs_log_item		cui_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	atomic_t			cui_refcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	atomic_t			cui_next_extent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	struct xfs_cui_log_format	cui_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static inline size_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) xfs_cui_log_item_sizeof(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	unsigned int		nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return offsetof(struct xfs_cui_log_item, cui_format) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 			xfs_cui_log_format_sizeof(nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)  * This is the "refcount update done" log item.  It is used to log the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)  * fact that some refcountbt updates mentioned in an earlier cui item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)  * have been performed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct xfs_cud_log_item {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	struct xfs_log_item		cud_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	struct xfs_cui_log_item		*cud_cuip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	struct xfs_cud_log_format	cud_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) extern struct kmem_zone	*xfs_cui_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) extern struct kmem_zone	*xfs_cud_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #endif	/* __XFS_REFCOUNT_ITEM_H__ */