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1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * Copyright (c) 2013 Red Hat, Inc.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#ifndef __XFS_SHARED_H__
20#define __XFS_SHARED_H__
21
22/*
23 * Definitions shared between kernel and userspace that don't fit into any other
24 * header file that is shared with userspace.
25 */
26struct xfs_ifork;
27struct xfs_buf;
28struct xfs_buf_ops;
29struct xfs_mount;
30struct xfs_trans;
31struct xfs_inode;
32
33/*
34 * Buffer verifier operations are widely used, including userspace tools
35 */
36extern const struct xfs_buf_ops xfs_agf_buf_ops;
37extern const struct xfs_buf_ops xfs_agi_buf_ops;
38extern const struct xfs_buf_ops xfs_agf_buf_ops;
39extern const struct xfs_buf_ops xfs_agfl_buf_ops;
40extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
41extern const struct xfs_buf_ops xfs_rmapbt_buf_ops;
42extern const struct xfs_buf_ops xfs_refcountbt_buf_ops;
43extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
44extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
45extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
46extern const struct xfs_buf_ops xfs_da3_node_buf_ops;
47extern const struct xfs_buf_ops xfs_dquot_buf_ops;
48extern const struct xfs_buf_ops xfs_symlink_buf_ops;
49extern const struct xfs_buf_ops xfs_agi_buf_ops;
50extern const struct xfs_buf_ops xfs_inobt_buf_ops;
51extern const struct xfs_buf_ops xfs_inode_buf_ops;
52extern const struct xfs_buf_ops xfs_inode_buf_ra_ops;
53extern const struct xfs_buf_ops xfs_dquot_buf_ops;
54extern const struct xfs_buf_ops xfs_dquot_buf_ra_ops;
55extern const struct xfs_buf_ops xfs_sb_buf_ops;
56extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops;
57extern const struct xfs_buf_ops xfs_symlink_buf_ops;
58extern const struct xfs_buf_ops xfs_rtbuf_ops;
59
60/*
61 * This structure is used to track log items associated with
62 * a transaction. It points to the log item and keeps some
63 * flags to track the state of the log item. It also tracks
64 * the amount of space needed to log the item it describes
65 * once we get to commit processing (see xfs_trans_commit()).
66 */
67struct xfs_log_item_desc {
68 struct xfs_log_item *lid_item;
69 struct list_head lid_trans;
70 unsigned char lid_flags;
71};
72
73#define XFS_LID_DIRTY 0x1
74
75/* log size calculation functions */
76int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
77int xfs_log_calc_minimum_size(struct xfs_mount *);
78
79
80/*
81 * Values for t_flags.
82 */
83#define XFS_TRANS_DIRTY 0x01 /* something needs to be logged */
84#define XFS_TRANS_SB_DIRTY 0x02 /* superblock is modified */
85#define XFS_TRANS_PERM_LOG_RES 0x04 /* xact took a permanent log res */
86#define XFS_TRANS_SYNC 0x08 /* make commit synchronous */
87#define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */
88#define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */
89#define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */
90#define XFS_TRANS_NOFS 0x80 /* pass KM_NOFS to kmem_alloc */
91
92/*
93 * Field values for xfs_trans_mod_sb.
94 */
95#define XFS_TRANS_SB_ICOUNT 0x00000001
96#define XFS_TRANS_SB_IFREE 0x00000002
97#define XFS_TRANS_SB_FDBLOCKS 0x00000004
98#define XFS_TRANS_SB_RES_FDBLOCKS 0x00000008
99#define XFS_TRANS_SB_FREXTENTS 0x00000010
100#define XFS_TRANS_SB_RES_FREXTENTS 0x00000020
101#define XFS_TRANS_SB_DBLOCKS 0x00000040
102#define XFS_TRANS_SB_AGCOUNT 0x00000080
103#define XFS_TRANS_SB_IMAXPCT 0x00000100
104#define XFS_TRANS_SB_REXTSIZE 0x00000200
105#define XFS_TRANS_SB_RBMBLOCKS 0x00000400
106#define XFS_TRANS_SB_RBLOCKS 0x00000800
107#define XFS_TRANS_SB_REXTENTS 0x00001000
108#define XFS_TRANS_SB_REXTSLOG 0x00002000
109
110/*
111 * Here we centralize the specification of XFS meta-data buffer reference count
112 * values. This determines how hard the buffer cache tries to hold onto the
113 * buffer.
114 */
115#define XFS_AGF_REF 4
116#define XFS_AGI_REF 4
117#define XFS_AGFL_REF 3
118#define XFS_INO_BTREE_REF 3
119#define XFS_ALLOC_BTREE_REF 2
120#define XFS_BMAP_BTREE_REF 2
121#define XFS_RMAP_BTREE_REF 2
122#define XFS_DIR_BTREE_REF 2
123#define XFS_INO_REF 2
124#define XFS_ATTR_BTREE_REF 1
125#define XFS_DQUOT_REF 1
126#define XFS_REFC_BTREE_REF 1
127
128/*
129 * Flags for xfs_trans_ichgtime().
130 */
131#define XFS_ICHGTIME_MOD 0x1 /* data fork modification timestamp */
132#define XFS_ICHGTIME_CHG 0x2 /* inode field change timestamp */
133#define XFS_ICHGTIME_CREATE 0x4 /* inode create timestamp */
134
135
136/*
137 * Symlink decoding/encoding functions
138 */
139int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
140int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
141 uint32_t size, struct xfs_buf *bp);
142bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset,
143 uint32_t size, struct xfs_buf *bp);
144void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
145 struct xfs_inode *ip, struct xfs_ifork *ifp);
146
147#endif /* __XFS_SHARED_H__ */