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 BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(" \ 11 #structname ") is wrong, expected " #size) 12 13 #define XFS_CHECK_OFFSET(structname, member, off) \ 14 BUILD_BUG_ON_MSG(offsetof(structname, member) != (off), \ 15 "XFS: offsetof(" #structname ", " #member ") is wrong, " \ 16 "expected " #off) 17 18 #define XFS_CHECK_VALUE(value, expected) \ 19 BUILD_BUG_ON_MSG((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, 88); 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 /* 76 * m68k has problems with xfs_attr_leaf_name_remote_t, but we pad it to 77 * 4 bytes anyway so it's not obviously a problem. Hence for the moment 78 * we don't check this structure. This can be re-instated when the attr 79 * definitions are updated to use c99 VLA definitions. 80 * 81 XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_remote_t, 12); 82 */ 83 84 XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, valuelen, 0); 85 XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, namelen, 2); 86 XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, nameval, 3); 87 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valueblk, 0); 88 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valuelen, 4); 89 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, namelen, 8); 90 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, name, 9); 91 XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t, 40); 92 XFS_CHECK_OFFSET(struct xfs_attr_shortform, hdr.totsize, 0); 93 XFS_CHECK_OFFSET(struct xfs_attr_shortform, hdr.count, 2); 94 XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].namelen, 4); 95 XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].valuelen, 5); 96 XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].flags, 6); 97 XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].nameval, 7); 98 XFS_CHECK_STRUCT_SIZE(xfs_da_blkinfo_t, 12); 99 XFS_CHECK_STRUCT_SIZE(xfs_da_intnode_t, 16); 100 XFS_CHECK_STRUCT_SIZE(xfs_da_node_entry_t, 8); 101 XFS_CHECK_STRUCT_SIZE(xfs_da_node_hdr_t, 16); 102 XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_free_t, 4); 103 XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_hdr_t, 16); 104 XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, freetag, 0); 105 XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, length, 2); 106 XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t, 16); 107 XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t, 16); 108 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t, 8); 109 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t, 16); 110 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t, 16); 111 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_tail_t, 4); 112 XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t, 3); 113 XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, namelen, 0); 114 XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, offset, 1); 115 XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, name, 3); 116 XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t, 10); 117 118 /* log structures */ 119 XFS_CHECK_STRUCT_SIZE(struct xfs_buf_log_format, 88); 120 XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat, 24); 121 XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32, 28); 122 XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64, 32); 123 XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32, 28); 124 XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64, 32); 125 XFS_CHECK_STRUCT_SIZE(struct xfs_extent_32, 12); 126 XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64, 16); 127 XFS_CHECK_STRUCT_SIZE(struct xfs_log_dinode, 176); 128 XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log, 28); 129 XFS_CHECK_STRUCT_SIZE(xfs_log_timestamp_t, 8); 130 XFS_CHECK_STRUCT_SIZE(struct xfs_log_legacy_timestamp, 8); 131 XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32, 52); 132 XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format, 56); 133 XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat, 20); 134 XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header, 16); 135 136 /* 137 * The v5 superblock format extended several v4 header structures with 138 * additional data. While new fields are only accessible on v5 139 * superblocks, it's important that the v5 structures place original v4 140 * fields/headers in the correct location on-disk. For example, we must 141 * be able to find magic values at the same location in certain blocks 142 * regardless of superblock version. 143 * 144 * The following checks ensure that various v5 data structures place the 145 * subset of v4 metadata associated with the same type of block at the 146 * start of the on-disk block. If there is no data structure definition 147 * for certain types of v4 blocks, traverse down to the first field of 148 * common metadata (e.g., magic value) and make sure it is at offset 149 * zero. 150 */ 151 XFS_CHECK_OFFSET(struct xfs_dir3_leaf, hdr.info.hdr, 0); 152 XFS_CHECK_OFFSET(struct xfs_da3_intnode, hdr.info.hdr, 0); 153 XFS_CHECK_OFFSET(struct xfs_dir3_data_hdr, hdr.magic, 0); 154 XFS_CHECK_OFFSET(struct xfs_dir3_free, hdr.hdr.magic, 0); 155 XFS_CHECK_OFFSET(struct xfs_attr3_leafblock, hdr.info.hdr, 0); 156 157 XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat, 192); 158 XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers, 24); 159 XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_req, 64); 160 XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers_req, 64); 161 162 /* 163 * Make sure the incore inode timestamp range corresponds to hand 164 * converted values based on the ondisk format specification. 165 */ 166 XFS_CHECK_VALUE(XFS_BIGTIME_TIME_MIN - XFS_BIGTIME_EPOCH_OFFSET, 167 XFS_LEGACY_TIME_MIN); 168 XFS_CHECK_VALUE(XFS_BIGTIME_TIME_MAX - XFS_BIGTIME_EPOCH_OFFSET, 169 16299260424LL); 170 171 /* Do the same with the incore quota expiration range. */ 172 XFS_CHECK_VALUE(XFS_DQ_BIGTIME_EXPIRY_MIN << XFS_DQ_BIGTIME_SHIFT, 4); 173 XFS_CHECK_VALUE(XFS_DQ_BIGTIME_EXPIRY_MAX << XFS_DQ_BIGTIME_SHIFT, 174 16299260424LL); 175 } 176 177 #endif /* __XFS_ONDISK_H */ 178