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
10 struct attrlist;
11 struct xfs_attr_list_context;
12 struct xfs_da_args;
13 struct xfs_da_state;
14 struct xfs_da_state_blk;
15 struct xfs_inode;
16 struct xfs_trans;
17
18 /*
19 * Incore version of the attribute leaf header.
20 */
21 struct xfs_attr3_icleaf_hdr {
22 uint32_t forw;
23 uint32_t back;
24 uint16_t magic;
25 uint16_t count;
26 uint16_t usedbytes;
27 /*
28 * Firstused is 32-bit here instead of 16-bit like the on-disk variant
29 * to support maximum fsb size of 64k without overflow issues throughout
30 * the attr code. Instead, the overflow condition is handled on
31 * conversion to/from disk.
32 */
33 uint32_t firstused;
34 __u8 holes;
35 struct {
36 uint16_t base;
37 uint16_t size;
38 } freemap[XFS_ATTR_LEAF_MAPSIZE];
39 };
40
41 /*========================================================================
42 * Function prototypes for the kernel.
43 *========================================================================*/
44
45 /*
46 * Internal routines when attribute fork size < XFS_LITINO(mp).
47 */
48 void xfs_attr_shortform_create(struct xfs_da_args *args);
49 void xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff);
50 int xfs_attr_shortform_getvalue(struct xfs_da_args *args);
51 int xfs_attr_shortform_to_leaf(struct xfs_da_args *args);
52 int xfs_attr_sf_removename(struct xfs_da_args *args);
53 struct xfs_attr_sf_entry *xfs_attr_sf_findname(struct xfs_da_args *args);
54 int xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
55 int xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes);
56 xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_attr_sf_hdr *sfp,
57 size_t size);
58 void xfs_attr_fork_remove(struct xfs_inode *ip, struct xfs_trans *tp);
59
60 /*
61 * Internal routines when attribute fork size == XFS_LBSIZE(mp).
62 */
63 int xfs_attr3_leaf_to_node(struct xfs_da_args *args);
64 int xfs_attr3_leaf_to_shortform(struct xfs_buf *bp,
65 struct xfs_da_args *args, int forkoff);
66 int xfs_attr3_leaf_clearflag(struct xfs_da_args *args);
67 int xfs_attr3_leaf_setflag(struct xfs_da_args *args);
68 int xfs_attr3_leaf_flipflags(struct xfs_da_args *args);
69
70 /*
71 * Routines used for growing the Btree.
72 */
73 int xfs_attr3_leaf_split(struct xfs_da_state *state,
74 struct xfs_da_state_blk *oldblk,
75 struct xfs_da_state_blk *newblk);
76 int xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf,
77 struct xfs_da_args *args);
78 int xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
79 int xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer,
80 struct xfs_da_args *args);
81 int xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer,
82 struct xfs_da_args *args);
83 int xfs_attr3_leaf_list_int(struct xfs_buf *bp,
84 struct xfs_attr_list_context *context);
85
86 /*
87 * Routines used for shrinking the Btree.
88 */
89 int xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
90 void xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
91 struct xfs_da_state_blk *drop_blk,
92 struct xfs_da_state_blk *save_blk);
93 /*
94 * Utility routines.
95 */
96 xfs_dahash_t xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count);
97 int xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
98 struct xfs_buf *leaf2_bp);
99 int xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local);
100 int xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
101 xfs_ino_t owner, xfs_dablk_t bno, struct xfs_buf **bpp);
102 void xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo,
103 struct xfs_attr3_icleaf_hdr *to,
104 struct xfs_attr_leafblock *from);
105 void xfs_attr3_leaf_hdr_to_disk(struct xfs_da_geometry *geo,
106 struct xfs_attr_leafblock *to,
107 struct xfs_attr3_icleaf_hdr *from);
108 xfs_failaddr_t xfs_attr3_leaf_header_check(struct xfs_buf *bp,
109 xfs_ino_t owner);
110
111 #endif /* __XFS_ATTR_LEAF_H__ */
112
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