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 static inline void __init 19 xfs_check_ondisk_structs(void) 20 { 21 /* ag/file structures */ 22 XFS_CHECK_STRUCT_SIZE(struct xfs_acl, 4); 23 XFS_CHECK_STRUCT_SIZE(struct xfs_acl_entry, 12); 24 XFS_CHECK_STRUCT_SIZE(struct xfs_agf, 224); 25 XFS_CHECK_STRUCT_SIZE(struct xfs_agfl, 36); 26 XFS_CHECK_STRUCT_SIZE(struct xfs_agi, 336); 27 XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_key, 8); 28 XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_rec, 16); 29 XFS_CHECK_STRUCT_SIZE(struct xfs_bmdr_block, 4); 30 XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_shdr, 48); 31 XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_lhdr, 64); 32 XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block, 72); 33 XFS_CHECK_STRUCT_SIZE(struct xfs_dinode, 176); 34 XFS_CHECK_STRUCT_SIZE(struct xfs_disk_dquot, 104); 35 XFS_CHECK_STRUCT_SIZE(struct xfs_dqblk, 136); 36 XFS_CHECK_STRUCT_SIZE(struct xfs_dsb, 264); 37 XFS_CHECK_STRUCT_SIZE(struct xfs_dsymlink_hdr, 56); 38 XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_key, 4); 39 XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_rec, 16); 40 XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_key, 4); 41 XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_rec, 12); 42 XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_key, 20); 43 XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_rec, 24); 44 XFS_CHECK_STRUCT_SIZE(struct xfs_timestamp, 8); 45 XFS_CHECK_STRUCT_SIZE(xfs_alloc_key_t, 8); 46 XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t, 4); 47 XFS_CHECK_STRUCT_SIZE(xfs_alloc_rec_t, 8); 48 XFS_CHECK_STRUCT_SIZE(xfs_inobt_ptr_t, 4); 49 XFS_CHECK_STRUCT_SIZE(xfs_refcount_ptr_t, 4); 50 XFS_CHECK_STRUCT_SIZE(xfs_rmap_ptr_t, 4); 51 52 /* dir/attr trees */ 53 XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leaf_hdr, 80); 54 XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leafblock, 88); 55 XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_rmt_hdr, 56); 56 XFS_CHECK_STRUCT_SIZE(struct xfs_da3_blkinfo, 56); 57 XFS_CHECK_STRUCT_SIZE(struct xfs_da3_intnode, 64); 58 XFS_CHECK_STRUCT_SIZE(struct xfs_da3_node_hdr, 64); 59 XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_blk_hdr, 48); 60 XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_data_hdr, 64); 61 XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free, 64); 62 XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free_hdr, 64); 63 XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf, 64); 64 XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf_hdr, 64); 65 XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_entry_t, 8); 66 XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_hdr_t, 32); 67 XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_map_t, 4); 68 XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_local_t, 4); 69 70 /* 71 * m68k has problems with xfs_attr_leaf_name_remote_t, but we pad it to 72 * 4 bytes anyway so it's not obviously a problem. Hence for the moment 73 * we don't check this structure. This can be re-instated when the attr 74 * definitions are updated to use c99 VLA definitions. 75 * 76 XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_remote_t, 12); 77 */ 78 79 XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, valuelen, 0); 80 XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, namelen, 2); 81 XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, nameval, 3); 82 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valueblk, 0); 83 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valuelen, 4); 84 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, namelen, 8); 85 XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, name, 9); 86 XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t, 40); 87 XFS_CHECK_OFFSET(xfs_attr_shortform_t, hdr.totsize, 0); 88 XFS_CHECK_OFFSET(xfs_attr_shortform_t, hdr.count, 2); 89 XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].namelen, 4); 90 XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].valuelen, 5); 91 XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].flags, 6); 92 XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].nameval, 7); 93 XFS_CHECK_STRUCT_SIZE(xfs_da_blkinfo_t, 12); 94 XFS_CHECK_STRUCT_SIZE(xfs_da_intnode_t, 16); 95 XFS_CHECK_STRUCT_SIZE(xfs_da_node_entry_t, 8); 96 XFS_CHECK_STRUCT_SIZE(xfs_da_node_hdr_t, 16); 97 XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_free_t, 4); 98 XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_hdr_t, 16); 99 XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, freetag, 0); 100 XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, length, 2); 101 XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t, 16); 102 XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t, 16); 103 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t, 8); 104 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t, 16); 105 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t, 16); 106 XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_tail_t, 4); 107 XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t, 3); 108 XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, namelen, 0); 109 XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, offset, 1); 110 XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, name, 3); 111 XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t, 10); 112 113 /* log structures */ 114 XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat, 24); 115 XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32, 28); 116 XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64, 32); 117 XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32, 28); 118 XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64, 32); 119 XFS_CHECK_STRUCT_SIZE(struct xfs_extent_32, 12); 120 XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64, 16); 121 XFS_CHECK_STRUCT_SIZE(struct xfs_log_dinode, 176); 122 XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log, 28); 123 XFS_CHECK_STRUCT_SIZE(struct xfs_ictimestamp, 8); 124 XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32, 52); 125 XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format, 56); 126 XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat, 20); 127 XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header, 16); 128 129 /* 130 * The v5 superblock format extended several v4 header structures with 131 * additional data. While new fields are only accessible on v5 132 * superblocks, it's important that the v5 structures place original v4 133 * fields/headers in the correct location on-disk. For example, we must 134 * be able to find magic values at the same location in certain blocks 135 * regardless of superblock version. 136 * 137 * The following checks ensure that various v5 data structures place the 138 * subset of v4 metadata associated with the same type of block at the 139 * start of the on-disk block. If there is no data structure definition 140 * for certain types of v4 blocks, traverse down to the first field of 141 * common metadata (e.g., magic value) and make sure it is at offset 142 * zero. 143 */ 144 XFS_CHECK_OFFSET(struct xfs_dir3_leaf, hdr.info.hdr, 0); 145 XFS_CHECK_OFFSET(struct xfs_da3_intnode, hdr.info.hdr, 0); 146 XFS_CHECK_OFFSET(struct xfs_dir3_data_hdr, hdr.magic, 0); 147 XFS_CHECK_OFFSET(struct xfs_dir3_free, hdr.hdr.magic, 0); 148 XFS_CHECK_OFFSET(struct xfs_attr3_leafblock, hdr.info.hdr, 0); 149 150 XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat, 192); 151 XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers, 24); 152 XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_req, 64); 153 XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers_req, 64); 154 } 155 156 #endif /* __XFS_ONDISK_H */ 157