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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
4 * Copyright (c) 2013 Red Hat, Inc.
5 * All Rights Reserved.
6 */
7#ifndef __XFS_ATTR_LEAF_H__
8#define __XFS_ATTR_LEAF_H__
9
10struct attrlist;
11struct attrlist_cursor_kern;
12struct xfs_attr_list_context;
13struct xfs_da_args;
14struct xfs_da_state;
15struct xfs_da_state_blk;
16struct xfs_inode;
17struct xfs_trans;
18
19/*
20 * Incore version of the attribute leaf header.
21 */
22struct xfs_attr3_icleaf_hdr {
23 uint32_t forw;
24 uint32_t back;
25 uint16_t magic;
26 uint16_t count;
27 uint16_t usedbytes;
28 /*
29 * Firstused is 32-bit here instead of 16-bit like the on-disk variant
30 * to support maximum fsb size of 64k without overflow issues throughout
31 * the attr code. Instead, the overflow condition is handled on
32 * conversion to/from disk.
33 */
34 uint32_t firstused;
35 __u8 holes;
36 struct {
37 uint16_t base;
38 uint16_t size;
39 } freemap[XFS_ATTR_LEAF_MAPSIZE];
40};
41
42/*========================================================================
43 * Function prototypes for the kernel.
44 *========================================================================*/
45
46/*
47 * Internal routines when attribute fork size < XFS_LITINO(mp).
48 */
49void xfs_attr_shortform_create(struct xfs_da_args *args);
50void xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff);
51int xfs_attr_shortform_lookup(struct xfs_da_args *args);
52int xfs_attr_shortform_getvalue(struct xfs_da_args *args);
53int xfs_attr_shortform_to_leaf(struct xfs_da_args *args,
54 struct xfs_buf **leaf_bp);
55int xfs_attr_shortform_remove(struct xfs_da_args *args);
56int xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
57int xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes);
58xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_inode *ip);
59void xfs_attr_fork_remove(struct xfs_inode *ip, struct xfs_trans *tp);
60
61/*
62 * Internal routines when attribute fork size == XFS_LBSIZE(mp).
63 */
64int xfs_attr3_leaf_to_node(struct xfs_da_args *args);
65int xfs_attr3_leaf_to_shortform(struct xfs_buf *bp,
66 struct xfs_da_args *args, int forkoff);
67int xfs_attr3_leaf_clearflag(struct xfs_da_args *args);
68int xfs_attr3_leaf_setflag(struct xfs_da_args *args);
69int xfs_attr3_leaf_flipflags(struct xfs_da_args *args);
70
71/*
72 * Routines used for growing the Btree.
73 */
74int xfs_attr3_leaf_split(struct xfs_da_state *state,
75 struct xfs_da_state_blk *oldblk,
76 struct xfs_da_state_blk *newblk);
77int xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf,
78 struct xfs_da_args *args);
79int xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
80int xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer,
81 struct xfs_da_args *args);
82int xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer,
83 struct xfs_da_args *args);
84int xfs_attr3_leaf_list_int(struct xfs_buf *bp,
85 struct xfs_attr_list_context *context);
86
87/*
88 * Routines used for shrinking the Btree.
89 */
90int xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
91void xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
92 struct xfs_da_state_blk *drop_blk,
93 struct xfs_da_state_blk *save_blk);
94/*
95 * Utility routines.
96 */
97xfs_dahash_t xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count);
98int xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
99 struct xfs_buf *leaf2_bp);
100int xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local);
101int xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
102 xfs_dablk_t bno, struct xfs_buf **bpp);
103void xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo,
104 struct xfs_attr3_icleaf_hdr *to,
105 struct xfs_attr_leafblock *from);
106void xfs_attr3_leaf_hdr_to_disk(struct xfs_da_geometry *geo,
107 struct xfs_attr_leafblock *to,
108 struct xfs_attr3_icleaf_hdr *from);
109
110#endif /* __XFS_ATTR_LEAF_H__ */