fs/xfs/xfs_ondisk.h

   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_buf_log_format,        88);
 115         XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat,          24);
 116         XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32,     28);
 117         XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64,     32);
 118         XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32,     28);
 119         XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64,     32);
 120         XFS_CHECK_STRUCT_SIZE(struct xfs_extent_32,             12);
 121         XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64,             16);
 122         XFS_CHECK_STRUCT_SIZE(struct xfs_log_dinode,            176);
 123         XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log,           28);
 124         XFS_CHECK_STRUCT_SIZE(struct xfs_ictimestamp,           8);
 125         XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32,   52);
 126         XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format,      56);
 127         XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,        20);
 128         XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header,          16);
 129
 130         /*
 131          * The v5 superblock format extended several v4 header structures with
 132          * additional data. While new fields are only accessible on v5
 133          * superblocks, it's important that the v5 structures place original v4
 134          * fields/headers in the correct location on-disk. For example, we must
 135          * be able to find magic values at the same location in certain blocks
 136          * regardless of superblock version.
 137          *
 138          * The following checks ensure that various v5 data structures place the
 139          * subset of v4 metadata associated with the same type of block at the
 140          * start of the on-disk block. If there is no data structure definition
 141          * for certain types of v4 blocks, traverse down to the first field of
 142          * common metadata (e.g., magic value) and make sure it is at offset
 143          * zero.
 144          */
 145         XFS_CHECK_OFFSET(struct xfs_dir3_leaf, hdr.info.hdr,    0);
 146         XFS_CHECK_OFFSET(struct xfs_da3_intnode, hdr.info.hdr,  0);
 147         XFS_CHECK_OFFSET(struct xfs_dir3_data_hdr, hdr.magic,   0);
 148         XFS_CHECK_OFFSET(struct xfs_dir3_free, hdr.hdr.magic,   0);
 149         XFS_CHECK_OFFSET(struct xfs_attr3_leafblock, hdr.info.hdr, 0);
 150
 151         XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat,              192);
 152         XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers,              24);
 153         XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_req,          64);
 154         XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers_req,          64);
 155 }
 156
 157 #endif /* __XFS_ONDISK_H */