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xfs: check sizes of XFS on-disk structures at compile time
Check the sizes of XFS on-disk structures when compiling the kernel. Use this to catch inadvertent changes in structure size due to padding and alignment issues, etc. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong
Dave Chinner
parent
5110cd82ca
commit
30cbc591c3
117
fs/xfs/xfs_ondisk.h
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117
fs/xfs/xfs_ondisk.h
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@ -0,0 +1,117 @@
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/*
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* Copyright (c) 2016 Oracle.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_ONDISK_H
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#define __XFS_ONDISK_H
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#define XFS_CHECK_STRUCT_SIZE(structname, size) \
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BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(" \
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#structname ") is wrong, expected " #size)
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static inline void __init
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xfs_check_ondisk_structs(void)
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{
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/* ag/file structures */
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XFS_CHECK_STRUCT_SIZE(struct xfs_acl, 4);
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XFS_CHECK_STRUCT_SIZE(struct xfs_acl_entry, 12);
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XFS_CHECK_STRUCT_SIZE(struct xfs_agf, 224);
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XFS_CHECK_STRUCT_SIZE(struct xfs_agfl, 36);
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XFS_CHECK_STRUCT_SIZE(struct xfs_agi, 336);
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XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_key, 8);
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XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_rec, 16);
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XFS_CHECK_STRUCT_SIZE(struct xfs_bmdr_block, 4);
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XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block, 72);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dinode, 176);
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XFS_CHECK_STRUCT_SIZE(struct xfs_disk_dquot, 104);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dqblk, 136);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dsb, 264);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dsymlink_hdr, 56);
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XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_key, 4);
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XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_rec, 16);
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XFS_CHECK_STRUCT_SIZE(struct xfs_timestamp, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_alloc_key_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t, 4);
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XFS_CHECK_STRUCT_SIZE(xfs_alloc_rec_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_inobt_ptr_t, 4);
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/* dir/attr trees */
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XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leaf_hdr, 80);
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XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leafblock, 88);
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XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_rmt_hdr, 56);
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XFS_CHECK_STRUCT_SIZE(struct xfs_da3_blkinfo, 56);
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XFS_CHECK_STRUCT_SIZE(struct xfs_da3_intnode, 64);
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XFS_CHECK_STRUCT_SIZE(struct xfs_da3_node_hdr, 64);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_blk_hdr, 48);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_data_hdr, 64);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free, 64);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free_hdr, 64);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf, 64);
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XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf_hdr, 64);
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XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_entry_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_hdr_t, 32);
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XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_map_t, 4);
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XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_local_t, 4);
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/*
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* m68k has problems with xfs_attr_leaf_name_remote_t, but we pad it to
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* 4 bytes anyway so it's not obviously a problem. Hence for the moment
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* we don't check this structure. This can be re-instated when the attr
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* definitions are updated to use c99 VLA definitions.
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*
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XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_remote_t, 12);
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*/
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XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t, 40);
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XFS_CHECK_STRUCT_SIZE(xfs_attr_shortform_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_da_blkinfo_t, 12);
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XFS_CHECK_STRUCT_SIZE(xfs_da_intnode_t, 16);
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XFS_CHECK_STRUCT_SIZE(xfs_da_node_entry_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_da_node_hdr_t, 16);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_free_t, 4);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_hdr_t, 16);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_unused_t, 6);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t, 16);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t, 16);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino4_t, 4);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino8_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_inou_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t, 8);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t, 16);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t, 16);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_tail_t, 4);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t, 3);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t, 10);
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XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_off_t, 2);
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/* log structures */
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XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat, 24);
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XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32, 28);
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XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64, 32);
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XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32, 28);
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XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64, 32);
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XFS_CHECK_STRUCT_SIZE(struct xfs_extent_32, 12);
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XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64, 16);
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XFS_CHECK_STRUCT_SIZE(struct xfs_log_dinode, 176);
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XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log, 28);
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XFS_CHECK_STRUCT_SIZE(struct xfs_ictimestamp, 8);
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XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32, 52);
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XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_64, 56);
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XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat, 20);
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XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header, 16);
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}
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#endif /* __XFS_ONDISK_H */
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@ -45,6 +45,7 @@
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#include "xfs_filestream.h"
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#include "xfs_quota.h"
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#include "xfs_sysfs.h"
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#include "xfs_ondisk.h"
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#include <linux/namei.h>
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#include <linux/init.h>
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@ -1817,6 +1818,8 @@ init_xfs_fs(void)
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{
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int error;
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xfs_check_ondisk_structs();
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printk(KERN_INFO XFS_VERSION_STRING " with "
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XFS_BUILD_OPTIONS " enabled\n");
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