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) 2000,2005 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #ifndef	__XFS_EXTFREE_ITEM_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #define	__XFS_EXTFREE_ITEM_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) /* kernel only EFI/EFD definitions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) struct xfs_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) struct kmem_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * Max number of extents in fast allocation path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define	XFS_EFI_MAX_FAST_EXTENTS	16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * This is the "extent free intention" log item.  It is used to log the fact
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * that some extents need to be free.  It is used in conjunction with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * "extent free done" log item described below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * The EFI is reference counted so that it is not freed prior to both the EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  * and EFD being committed and unpinned. This ensures the EFI is inserted into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  * the AIL even in the event of out of order EFI/EFD processing. In other words,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  * an EFI is born with two references:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * 	1.) an EFI held reference to track EFI AIL insertion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  * 	2.) an EFD held reference to track EFD commit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  * On allocation, both references are the responsibility of the caller. Once the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  * EFI is added to and dirtied in a transaction, ownership of reference one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  * transfers to the transaction. The reference is dropped once the EFI is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)  * inserted to the AIL or in the event of failure along the way (e.g., commit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)  * failure, log I/O error, etc.). Note that the caller remains responsible for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  * the EFD reference under all circumstances to this point. The caller has no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  * means to detect failure once the transaction is committed, however.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  * Therefore, an EFD is required after this point, even in the event of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  * unrelated failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  * Once an EFD is allocated and dirtied in a transaction, reference two
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)  * transfers to the transaction. The EFD reference is dropped once it reaches
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)  * the unpin handler. Similar to the EFI, the reference also drops in the event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)  * of commit failure or log I/O errors. Note that the EFD is not inserted in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)  * AIL, so at this point both the EFI and EFD are freed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct xfs_efi_log_item {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	struct xfs_log_item	efi_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	atomic_t		efi_refcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	atomic_t		efi_next_extent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	xfs_efi_log_format_t	efi_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)  * This is the "extent free done" log item.  It is used to log
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)  * the fact that some extents earlier mentioned in an efi item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)  * have been freed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct xfs_efd_log_item {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	struct xfs_log_item	efd_item;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	struct xfs_efi_log_item *efd_efip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	uint			efd_next_extent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	xfs_efd_log_format_t	efd_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) };
^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)  * Max number of extents in fast allocation path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #define	XFS_EFD_MAX_FAST_EXTENTS	16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) extern struct kmem_zone	*xfs_efi_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) extern struct kmem_zone	*xfs_efd_zone;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #endif	/* __XFS_EXTFREE_ITEM_H__ */