xref: /linux/fs/xfs/libxfs/xfs_ondisk.h (revision 9c93c0b44be36fd5267fb79ae33453f989fbe909)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2016 Oracle.
4  * All Rights Reserved.
5  */
6 #ifndef __XFS_ONDISK_H
7 #define __XFS_ONDISK_H
8 
9 #define XFS_CHECK_STRUCT_SIZE(structname, size) \
10 	static_assert(sizeof(structname) == (size), \
11 		"XFS: sizeof(" #structname ") is wrong, expected " #size)
12 
13 #define XFS_CHECK_OFFSET(structname, member, off) \
14 	static_assert(offsetof(structname, member) == (off), \
15 		"XFS: offsetof(" #structname ", " #member ") is wrong, " \
16 		"expected " #off)
17 
18 #define XFS_CHECK_VALUE(value, expected) \
19 	static_assert((value) == (expected), \
20 		"XFS: value of " #value " is wrong, expected " #expected)
21 
22 static inline void __init
23 xfs_check_ondisk_structs(void)
24 {
25 	/* ag/file structures */
26 	XFS_CHECK_STRUCT_SIZE(struct xfs_acl,			4);
27 	XFS_CHECK_STRUCT_SIZE(struct xfs_acl_entry,		12);
28 	XFS_CHECK_STRUCT_SIZE(struct xfs_agf,			224);
29 	XFS_CHECK_STRUCT_SIZE(struct xfs_agfl,			36);
30 	XFS_CHECK_STRUCT_SIZE(struct xfs_agi,			344);
31 	XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_key,		8);
32 	XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_rec,		16);
33 	XFS_CHECK_STRUCT_SIZE(struct xfs_bmdr_block,		4);
34 	XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_shdr,	48);
35 	XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_lhdr,	64);
36 	XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block,		72);
37 	XFS_CHECK_STRUCT_SIZE(struct xfs_dinode,		176);
38 	XFS_CHECK_STRUCT_SIZE(struct xfs_disk_dquot,		104);
39 	XFS_CHECK_STRUCT_SIZE(struct xfs_dqblk,			136);
40 	XFS_CHECK_STRUCT_SIZE(struct xfs_dsb,			264);
41 	XFS_CHECK_STRUCT_SIZE(struct xfs_dsymlink_hdr,		56);
42 	XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_key,		4);
43 	XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_rec,		16);
44 	XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_key,		4);
45 	XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_rec,		12);
46 	XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_key,		20);
47 	XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_rec,		24);
48 	XFS_CHECK_STRUCT_SIZE(xfs_timestamp_t,			8);
49 	XFS_CHECK_STRUCT_SIZE(struct xfs_legacy_timestamp,	8);
50 	XFS_CHECK_STRUCT_SIZE(xfs_alloc_key_t,			8);
51 	XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t,			4);
52 	XFS_CHECK_STRUCT_SIZE(xfs_alloc_rec_t,			8);
53 	XFS_CHECK_STRUCT_SIZE(xfs_inobt_ptr_t,			4);
54 	XFS_CHECK_STRUCT_SIZE(xfs_refcount_ptr_t,		4);
55 	XFS_CHECK_STRUCT_SIZE(xfs_rmap_ptr_t,			4);
56 
57 	/* dir/attr trees */
58 	XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leaf_hdr,	80);
59 	XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leafblock,	80);
60 	XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_rmt_hdr,		56);
61 	XFS_CHECK_STRUCT_SIZE(struct xfs_da3_blkinfo,		56);
62 	XFS_CHECK_STRUCT_SIZE(struct xfs_da3_intnode,		64);
63 	XFS_CHECK_STRUCT_SIZE(struct xfs_da3_node_hdr,		64);
64 	XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_blk_hdr,		48);
65 	XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_data_hdr,		64);
66 	XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free,		64);
67 	XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free_hdr,		64);
68 	XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf,		64);
69 	XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf_hdr,		64);
70 	XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_entry_t,		8);
71 	XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_hdr_t,		32);
72 	XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_map_t,		4);
73 	XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_local_t,	4);
74 
75 	/* realtime structures */
76 	XFS_CHECK_STRUCT_SIZE(union xfs_rtword_raw,		4);
77 	XFS_CHECK_STRUCT_SIZE(union xfs_suminfo_raw,		4);
78 
79 	/*
80 	 * m68k has problems with xfs_attr_leaf_name_remote_t, but we pad it to
81 	 * 4 bytes anyway so it's not obviously a problem.  Hence for the moment
82 	 * we don't check this structure. This can be re-instated when the attr
83 	 * definitions are updated to use c99 VLA definitions.
84 	 *
85 	XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_remote_t,	12);
86 	 */
87 
88 	XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, valuelen,	0);
89 	XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, namelen,	2);
90 	XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, nameval,	3);
91 	XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valueblk,	0);
92 	XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valuelen,	4);
93 	XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, namelen,	8);
94 	XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, name,	9);
95 	XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t,		32);
96 	XFS_CHECK_STRUCT_SIZE(struct xfs_attr_sf_hdr,		4);
97 	XFS_CHECK_OFFSET(struct xfs_attr_sf_hdr, totsize,	0);
98 	XFS_CHECK_OFFSET(struct xfs_attr_sf_hdr, count,		2);
99 	XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, namelen,	0);
100 	XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, valuelen,	1);
101 	XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, flags,	2);
102 	XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, nameval,	3);
103 	XFS_CHECK_STRUCT_SIZE(xfs_da_blkinfo_t,			12);
104 	XFS_CHECK_STRUCT_SIZE(xfs_da_intnode_t,			16);
105 	XFS_CHECK_STRUCT_SIZE(xfs_da_node_entry_t,		8);
106 	XFS_CHECK_STRUCT_SIZE(xfs_da_node_hdr_t,		16);
107 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_free_t,		4);
108 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_hdr_t,		16);
109 	XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, freetag,	0);
110 	XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, length,	2);
111 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t,		16);
112 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t,			16);
113 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t,		8);
114 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t,		16);
115 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t,			16);
116 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_tail_t,		4);
117 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t,		3);
118 	XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, namelen,		0);
119 	XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, offset,		1);
120 	XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, name,		3);
121 	XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t,		10);
122 
123 	/* log structures */
124 	XFS_CHECK_STRUCT_SIZE(struct xfs_buf_log_format,	88);
125 	XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat,		24);
126 	XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32,	16);
127 	XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64,	16);
128 	XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32,	16);
129 	XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64,	16);
130 	XFS_CHECK_STRUCT_SIZE(struct xfs_extent_32,		12);
131 	XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64,		16);
132 	XFS_CHECK_STRUCT_SIZE(struct xfs_log_dinode,		176);
133 	XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log,		28);
134 	XFS_CHECK_STRUCT_SIZE(xfs_log_timestamp_t,		8);
135 	XFS_CHECK_STRUCT_SIZE(struct xfs_log_legacy_timestamp,	8);
136 	XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32,	52);
137 	XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format,	56);
138 	XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,	20);
139 	XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header,		16);
140 	XFS_CHECK_STRUCT_SIZE(struct xfs_attri_log_format,	40);
141 	XFS_CHECK_STRUCT_SIZE(struct xfs_attrd_log_format,	16);
142 	XFS_CHECK_STRUCT_SIZE(struct xfs_bui_log_format,	16);
143 	XFS_CHECK_STRUCT_SIZE(struct xfs_bud_log_format,	16);
144 	XFS_CHECK_STRUCT_SIZE(struct xfs_cui_log_format,	16);
145 	XFS_CHECK_STRUCT_SIZE(struct xfs_cud_log_format,	16);
146 	XFS_CHECK_STRUCT_SIZE(struct xfs_rui_log_format,	16);
147 	XFS_CHECK_STRUCT_SIZE(struct xfs_rud_log_format,	16);
148 	XFS_CHECK_STRUCT_SIZE(struct xfs_map_extent,		32);
149 	XFS_CHECK_STRUCT_SIZE(struct xfs_phys_extent,		16);
150 
151 	XFS_CHECK_OFFSET(struct xfs_bui_log_format, bui_extents,	16);
152 	XFS_CHECK_OFFSET(struct xfs_cui_log_format, cui_extents,	16);
153 	XFS_CHECK_OFFSET(struct xfs_rui_log_format, rui_extents,	16);
154 	XFS_CHECK_OFFSET(struct xfs_efi_log_format, efi_extents,	16);
155 	XFS_CHECK_OFFSET(struct xfs_efi_log_format_32, efi_extents,	16);
156 	XFS_CHECK_OFFSET(struct xfs_efi_log_format_64, efi_extents,	16);
157 
158 	/*
159 	 * The v5 superblock format extended several v4 header structures with
160 	 * additional data. While new fields are only accessible on v5
161 	 * superblocks, it's important that the v5 structures place original v4
162 	 * fields/headers in the correct location on-disk. For example, we must
163 	 * be able to find magic values at the same location in certain blocks
164 	 * regardless of superblock version.
165 	 *
166 	 * The following checks ensure that various v5 data structures place the
167 	 * subset of v4 metadata associated with the same type of block at the
168 	 * start of the on-disk block. If there is no data structure definition
169 	 * for certain types of v4 blocks, traverse down to the first field of
170 	 * common metadata (e.g., magic value) and make sure it is at offset
171 	 * zero.
172 	 */
173 	XFS_CHECK_OFFSET(struct xfs_dir3_leaf, hdr.info.hdr,	0);
174 	XFS_CHECK_OFFSET(struct xfs_da3_intnode, hdr.info.hdr,	0);
175 	XFS_CHECK_OFFSET(struct xfs_dir3_data_hdr, hdr.magic,	0);
176 	XFS_CHECK_OFFSET(struct xfs_dir3_free, hdr.hdr.magic,	0);
177 	XFS_CHECK_OFFSET(struct xfs_attr3_leafblock, hdr.info.hdr, 0);
178 
179 	XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat,		192);
180 	XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers,		24);
181 	XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_req,		64);
182 	XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers_req,		64);
183 
184 	/*
185 	 * Make sure the incore inode timestamp range corresponds to hand
186 	 * converted values based on the ondisk format specification.
187 	 */
188 	XFS_CHECK_VALUE(XFS_BIGTIME_TIME_MIN - XFS_BIGTIME_EPOCH_OFFSET,
189 			XFS_LEGACY_TIME_MIN);
190 	XFS_CHECK_VALUE(XFS_BIGTIME_TIME_MAX - XFS_BIGTIME_EPOCH_OFFSET,
191 			16299260424LL);
192 
193 	/* Do the same with the incore quota expiration range. */
194 	XFS_CHECK_VALUE(XFS_DQ_BIGTIME_EXPIRY_MIN << XFS_DQ_BIGTIME_SHIFT, 4);
195 	XFS_CHECK_VALUE(XFS_DQ_BIGTIME_EXPIRY_MAX << XFS_DQ_BIGTIME_SHIFT,
196 			16299260424LL);
197 }
198 
199 #endif /* __XFS_ONDISK_H */
200