fs/xfs/xfs_ondisk.h

   1 /*
   2  * Copyright (c) 2016 Oracle.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_ONDISK_H
  19 #define __XFS_ONDISK_H
  20
  21 #define XFS_CHECK_STRUCT_SIZE(structname, size) \
  22         BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(" \
  23                 #structname ") is wrong, expected " #size)
  24
  25 #define XFS_CHECK_OFFSET(structname, member, off) \
  26         BUILD_BUG_ON_MSG(offsetof(structname, member) != (off), \
  27                 "XFS: offsetof(" #structname ", " #member ") is wrong, " \
  28                 "expected " #off)
  29
  30 static inline void __init
  31 xfs_check_ondisk_structs(void)
  32 {
  33         /* ag/file structures */
  34         XFS_CHECK_STRUCT_SIZE(struct xfs_acl,                   4);
  35         XFS_CHECK_STRUCT_SIZE(struct xfs_acl_entry,             12);
  36         XFS_CHECK_STRUCT_SIZE(struct xfs_agf,                   224);
  37         XFS_CHECK_STRUCT_SIZE(struct xfs_agfl,                  36);
  38         XFS_CHECK_STRUCT_SIZE(struct xfs_agi,                   336);
  39         XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_key,              8);
  40         XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_rec,              16);
  41         XFS_CHECK_STRUCT_SIZE(struct xfs_bmdr_block,            4);
  42         XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_shdr,      48);
  43         XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_lhdr,      64);
  44         XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block,           72);
  45         XFS_CHECK_STRUCT_SIZE(struct xfs_dinode,                176);
  46         XFS_CHECK_STRUCT_SIZE(struct xfs_disk_dquot,            104);
  47         XFS_CHECK_STRUCT_SIZE(struct xfs_dqblk,                 136);
  48         XFS_CHECK_STRUCT_SIZE(struct xfs_dsb,                   264);
  49         XFS_CHECK_STRUCT_SIZE(struct xfs_dsymlink_hdr,          56);
  50         XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_key,             4);
  51         XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_rec,             16);
  52         XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_key,          4);
  53         XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_rec,          12);
  54         XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_key,              20);
  55         XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_rec,              24);
  56         XFS_CHECK_STRUCT_SIZE(struct xfs_timestamp,             8);
  57         XFS_CHECK_STRUCT_SIZE(xfs_alloc_key_t,                  8);
  58         XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t,                  4);
  59         XFS_CHECK_STRUCT_SIZE(xfs_alloc_rec_t,                  8);
  60         XFS_CHECK_STRUCT_SIZE(xfs_inobt_ptr_t,                  4);
  61         XFS_CHECK_STRUCT_SIZE(xfs_refcount_ptr_t,               4);
  62         XFS_CHECK_STRUCT_SIZE(xfs_rmap_ptr_t,                   4);
  63
  64         /* dir/attr trees */
  65         XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leaf_hdr,        80);
  66         XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leafblock,       88);
  67         XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_rmt_hdr,         56);
  68         XFS_CHECK_STRUCT_SIZE(struct xfs_da3_blkinfo,           56);
  69         XFS_CHECK_STRUCT_SIZE(struct xfs_da3_intnode,           64);
  70         XFS_CHECK_STRUCT_SIZE(struct xfs_da3_node_hdr,          64);
  71         XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_blk_hdr,          48);
  72         XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_data_hdr,         64);
  73         XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free,             64);
  74         XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free_hdr,         64);
  75         XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf,             64);
  76         XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf_hdr,         64);
  77         XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_entry_t,            8);
  78         XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_hdr_t,              32);
  79         XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_map_t,              4);
  80         XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_local_t,       4);
  81
  82         /*
  83          * m68k has problems with xfs_attr_leaf_name_remote_t, but we pad it to
  84          * 4 bytes anyway so it's not obviously a problem.  Hence for the moment
  85          * we don't check this structure. This can be re-instated when the attr
  86          * definitions are updated to use c99 VLA definitions.
  87          *
  88         XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_remote_t,      12);
  89          */
  90
  91         XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, valuelen,  0);
  92         XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, namelen,   2);
  93         XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, nameval,   3);
  94         XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valueblk, 0);
  95         XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valuelen, 4);
  96         XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, namelen,  8);
  97         XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, name,     9);
  98         XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t,             40);
  99         XFS_CHECK_OFFSET(xfs_attr_shortform_t, hdr.totsize,     0);
 100         XFS_CHECK_OFFSET(xfs_attr_shortform_t, hdr.count,       2);
 101         XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].namelen, 4);
 102         XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].valuelen, 5);
 103         XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].flags,   6);
 104         XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].nameval, 7);
 105         XFS_CHECK_STRUCT_SIZE(xfs_da_blkinfo_t,                 12);
 106         XFS_CHECK_STRUCT_SIZE(xfs_da_intnode_t,                 16);
 107         XFS_CHECK_STRUCT_SIZE(xfs_da_node_entry_t,              8);
 108         XFS_CHECK_STRUCT_SIZE(xfs_da_node_hdr_t,                16);
 109         XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_free_t,             4);
 110         XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_hdr_t,              16);
 111         XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, freetag,       0);
 112         XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, length,        2);
 113         XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t,              16);
 114         XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t,                  16);
 115         XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t,            8);
 116         XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t,              16);
 117         XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t,                  16);
 118         XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_tail_t,             4);
 119         XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t,              3);
 120         XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, namelen,          0);
 121         XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, offset,           1);
 122         XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, name,             3);
 123         XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t,                10);
 124
 125         /* log structures */
 126         XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat,          24);
 127         XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32,     28);
 128         XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64,     32);
 129         XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32,     28);
 130         XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64,     32);
 131         XFS_CHECK_STRUCT_SIZE(struct xfs_extent_32,             12);
 132         XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64,             16);
 133         XFS_CHECK_STRUCT_SIZE(struct xfs_log_dinode,            176);
 134         XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log,           28);
 135         XFS_CHECK_STRUCT_SIZE(struct xfs_ictimestamp,           8);
 136         XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32,   52);
 137         XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_64,   56);
 138         XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,        20);
 139         XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header,          16);
 140 }
 141
 142 #endif /* __XFS_ONDISK_H */