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 xfs_attr_list_context;
12struct xfs_da_args;
13struct xfs_da_state;
14struct xfs_da_state_blk;
15struct xfs_inode;
16struct xfs_trans;
17
18/*
19 * Incore version of the attribute leaf header.
20 */
21struct 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 */
48void	xfs_attr_shortform_create(struct xfs_da_args *args);
49void	xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff);
50int	xfs_attr_shortform_getvalue(struct xfs_da_args *args);
51int	xfs_attr_shortform_to_leaf(struct xfs_da_args *args);
52int	xfs_attr_sf_removename(struct xfs_da_args *args);
53struct xfs_attr_sf_entry *xfs_attr_sf_findname(struct xfs_da_args *args);
54int	xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
55int	xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes);
56xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_attr_sf_hdr *sfp,
57		size_t size);
58void	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 */
63int	xfs_attr3_leaf_to_node(struct xfs_da_args *args);
64int	xfs_attr3_leaf_to_shortform(struct xfs_buf *bp,
65				   struct xfs_da_args *args, int forkoff);
66int	xfs_attr3_leaf_clearflag(struct xfs_da_args *args);
67int	xfs_attr3_leaf_setflag(struct xfs_da_args *args);
68int	xfs_attr3_leaf_flipflags(struct xfs_da_args *args);
69
70/*
71 * Routines used for growing the Btree.
72 */
73int	xfs_attr3_leaf_split(struct xfs_da_state *state,
74				   struct xfs_da_state_blk *oldblk,
75				   struct xfs_da_state_blk *newblk);
76int	xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf,
77					struct xfs_da_args *args);
78int	xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
79int	xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer,
80				 struct xfs_da_args *args);
81int	xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer,
82				    struct xfs_da_args *args);
83int	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 */
89int	xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
90void	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 */
96xfs_dahash_t	xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count);
97int	xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
98				   struct xfs_buf *leaf2_bp);
99int	xfs_attr_leaf_newentsize(struct xfs_da_args *args, int *local);
100int	xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
101			xfs_dablk_t bno, struct xfs_buf **bpp);
102void	xfs_attr3_leaf_hdr_from_disk(struct xfs_da_geometry *geo,
103				     struct xfs_attr3_icleaf_hdr *to,
104				     struct xfs_attr_leafblock *from);
105void	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
109#endif	/* __XFS_ATTR_LEAF_H__ */
110