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review.trustedfirmware.org / hafnium / third_party / linux / 3a0ad55d848b50499b68d7141d4eca997fce28ef / . / fs / xfs / libxfs / xfs_shared.h
blob: 1c5debe748f0aca5431fa45daf7fbc078270378e [file] [log] [blame]
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * Copyright (c) 2013 Red Hat, Inc.
5 * All Rights Reserved.
6 */
7#ifndef __XFS_SHARED_H__
8#define __XFS_SHARED_H__
9
10/*
11 * Definitions shared between kernel and userspace that don't fit into any other
12 * header file that is shared with userspace.
13 */
14struct xfs_ifork;
15struct xfs_buf;
16struct xfs_buf_ops;
17struct xfs_mount;
18struct xfs_trans;
19struct xfs_inode;
20
21/*
22 * Buffer verifier operations are widely used, including userspace tools
23 */
24extern const struct xfs_buf_ops xfs_agf_buf_ops;
25extern const struct xfs_buf_ops xfs_agi_buf_ops;
26extern const struct xfs_buf_ops xfs_agf_buf_ops;
27extern const struct xfs_buf_ops xfs_agfl_buf_ops;
28extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
29extern const struct xfs_buf_ops xfs_rmapbt_buf_ops;
30extern const struct xfs_buf_ops xfs_refcountbt_buf_ops;
31extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
32extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
33extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
34extern const struct xfs_buf_ops xfs_da3_node_buf_ops;
35extern const struct xfs_buf_ops xfs_dquot_buf_ops;
36extern const struct xfs_buf_ops xfs_symlink_buf_ops;
37extern const struct xfs_buf_ops xfs_agi_buf_ops;
38extern const struct xfs_buf_ops xfs_inobt_buf_ops;
39extern const struct xfs_buf_ops xfs_inode_buf_ops;
40extern const struct xfs_buf_ops xfs_inode_buf_ra_ops;
41extern const struct xfs_buf_ops xfs_dquot_buf_ops;
42extern const struct xfs_buf_ops xfs_dquot_buf_ra_ops;
43extern const struct xfs_buf_ops xfs_sb_buf_ops;
44extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops;
45extern const struct xfs_buf_ops xfs_symlink_buf_ops;
46extern const struct xfs_buf_ops xfs_rtbuf_ops;
47
48/* log size calculation functions */
49int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
50int xfs_log_calc_minimum_size(struct xfs_mount *);
51
52struct xfs_trans_res;
53void xfs_log_get_max_trans_res(struct xfs_mount *mp,
54 struct xfs_trans_res *max_resp);
55
56/*
57 * Values for t_flags.
58 */
59#define XFS_TRANS_DIRTY 0x01 /* something needs to be logged */
60#define XFS_TRANS_SB_DIRTY 0x02 /* superblock is modified */
61#define XFS_TRANS_PERM_LOG_RES 0x04 /* xact took a permanent log res */
62#define XFS_TRANS_SYNC 0x08 /* make commit synchronous */
63#define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */
64#define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */
65#define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */
66#define XFS_TRANS_NOFS 0x80 /* pass KM_NOFS to kmem_alloc */
67/*
68 * LOWMODE is used by the allocator to activate the lowspace algorithm - when
69 * free space is running low the extent allocator may choose to allocate an
70 * extent from an AG without leaving sufficient space for a btree split when
71 * inserting the new extent. In this case the allocator will enable the
72 * lowspace algorithm which is supposed to allow further allocations (such as
73 * btree splits and newroots) to allocate from sequential AGs. In order to
74 * avoid locking AGs out of order the lowspace algorithm will start searching
75 * for free space from AG 0. If the correct transaction reservations have been
76 * made then this algorithm will eventually find all the space it needs.
77 */
78#define XFS_TRANS_LOWMODE 0x100 /* allocate in low space mode */
79
80/*
81 * Field values for xfs_trans_mod_sb.
82 */
83#define XFS_TRANS_SB_ICOUNT 0x00000001
84#define XFS_TRANS_SB_IFREE 0x00000002
85#define XFS_TRANS_SB_FDBLOCKS 0x00000004
86#define XFS_TRANS_SB_RES_FDBLOCKS 0x00000008
87#define XFS_TRANS_SB_FREXTENTS 0x00000010
88#define XFS_TRANS_SB_RES_FREXTENTS 0x00000020
89#define XFS_TRANS_SB_DBLOCKS 0x00000040
90#define XFS_TRANS_SB_AGCOUNT 0x00000080
91#define XFS_TRANS_SB_IMAXPCT 0x00000100
92#define XFS_TRANS_SB_REXTSIZE 0x00000200
93#define XFS_TRANS_SB_RBMBLOCKS 0x00000400
94#define XFS_TRANS_SB_RBLOCKS 0x00000800
95#define XFS_TRANS_SB_REXTENTS 0x00001000
96#define XFS_TRANS_SB_REXTSLOG 0x00002000
97
98/*
99 * Here we centralize the specification of XFS meta-data buffer reference count
100 * values. This determines how hard the buffer cache tries to hold onto the
101 * buffer.
102 */
103#define XFS_AGF_REF 4
104#define XFS_AGI_REF 4
105#define XFS_AGFL_REF 3
106#define XFS_INO_BTREE_REF 3
107#define XFS_ALLOC_BTREE_REF 2
108#define XFS_BMAP_BTREE_REF 2
109#define XFS_RMAP_BTREE_REF 2
110#define XFS_DIR_BTREE_REF 2
111#define XFS_INO_REF 2
112#define XFS_ATTR_BTREE_REF 1
113#define XFS_DQUOT_REF 1
114#define XFS_REFC_BTREE_REF 1
115#define XFS_SSB_REF 0
116
117/*
118 * Flags for xfs_trans_ichgtime().
119 */
120#define XFS_ICHGTIME_MOD 0x1 /* data fork modification timestamp */
121#define XFS_ICHGTIME_CHG 0x2 /* inode field change timestamp */
122#define XFS_ICHGTIME_CREATE 0x4 /* inode create timestamp */
123
124
125/*
126 * Symlink decoding/encoding functions
127 */
128int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
129int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
130 uint32_t size, struct xfs_buf *bp);
131bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset,
132 uint32_t size, struct xfs_buf *bp);
133void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
134 struct xfs_inode *ip, struct xfs_ifork *ifp);
135xfs_failaddr_t xfs_symlink_shortform_verify(struct xfs_inode *ip);
136
137#endif /* __XFS_SHARED_H__ */