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 22static inline void __init 23xfs_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