xref: /linux/fs/xfs/xfs_attr_item.h (revision afeea2758b4f1210361ce2a91d8fa3e7df606ad2)
1 /* SPDX-License-Identifier: GPL-2.0-or-later
2  *
3  * Copyright (C) 2022 Oracle.  All Rights Reserved.
4  * Author: Allison Henderson <allison.henderson@oracle.com>
5  */
6 #ifndef	__XFS_ATTR_ITEM_H__
7 #define	__XFS_ATTR_ITEM_H__
8 
9 /* kernel only ATTRI/ATTRD definitions */
10 
11 struct xfs_mount;
12 struct kmem_zone;
13 
14 struct xfs_attri_log_nameval {
15 	struct xfs_log_iovec	name;
16 	struct xfs_log_iovec	new_name;	/* PPTR_REPLACE only */
17 	struct xfs_log_iovec	value;
18 	struct xfs_log_iovec	new_value;	/* PPTR_REPLACE only */
19 	refcount_t		refcount;
20 
21 	/* name and value follow the end of this struct */
22 };
23 
24 /*
25  * This is the "attr intention" log item.  It is used to log the fact that some
26  * extended attribute operations need to be processed.  An operation is
27  * currently either a set or remove.  Set or remove operations are described by
28  * the xfs_attr_intent which may be logged to this intent.
29  *
30  * During a normal attr operation, name and value point to the name and value
31  * fields of the caller's xfs_da_args structure.  During a recovery, the name
32  * and value buffers are copied from the log, and stored in a trailing buffer
33  * attached to the xfs_attr_intent until they are committed.  They are freed
34  * when the xfs_attr_intent itself is freed when the work is done.
35  */
36 struct xfs_attri_log_item {
37 	struct xfs_log_item		attri_item;
38 	atomic_t			attri_refcount;
39 	struct xfs_attri_log_nameval	*attri_nameval;
40 	struct xfs_attri_log_format	attri_format;
41 };
42 
43 /*
44  * This is the "attr done" log item.  It is used to log the fact that some attrs
45  * earlier mentioned in an attri item have been freed.
46  */
47 struct xfs_attrd_log_item {
48 	struct xfs_log_item		attrd_item;
49 	struct xfs_attri_log_item	*attrd_attrip;
50 	struct xfs_attrd_log_format	attrd_format;
51 };
52 
53 extern struct kmem_cache	*xfs_attri_cache;
54 extern struct kmem_cache	*xfs_attrd_cache;
55 
56 enum xfs_attr_defer_op {
57 	XFS_ATTR_DEFER_SET,
58 	XFS_ATTR_DEFER_REMOVE,
59 	XFS_ATTR_DEFER_REPLACE,
60 };
61 
62 void xfs_attr_defer_add(struct xfs_da_args *args, enum xfs_attr_defer_op op);
63 
64 #endif	/* __XFS_ATTR_ITEM_H__ */
65