On Fri, Jan 22, 2016 at 04:34:44PM -0800, Darrick J. Wong wrote:
> 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@xxxxxxxxxx>
> ---
> fs/xfs/xfs_ondisk.h | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++
> fs/xfs/xfs_super.c | 3 +
> 2 files changed, 111 insertions(+)
> create mode 100644 fs/xfs/xfs_ondisk.h
>
>
> diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
> new file mode 100644
> index 0000000..56fab46
> --- /dev/null
> +++ b/fs/xfs/xfs_ondisk.h
> @@ -0,0 +1,108 @@
> +/*
> + * Copyright (c) 2016 Oracle.
> + * All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it would be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write the Free Software Foundation,
> + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +#ifndef __XFS_ONDISK_H
> +#define __XFS_ONDISK_H
> +
> +#define XFS_CHECK_STRUCT_SIZE(structname, size) \
> + BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(struct " \
We're printing "struct" in the core message as well as part of the
structname (where appropriate). E.g., "sizeof(struct struct xfs_acl) is
wrong, ..."
It would also be nice to include the current structure size in the
message if it happens to be unexpected. Otherwise, seems fine to me.
Brian
> + #structname ") is wrong, expected " #size)
> +
> +static inline void __init
> +xfs_check_ondisk_structs(void)
> +{
> + /* ag/file structures */
> + XFS_CHECK_STRUCT_SIZE(struct xfs_acl, 4);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_acl_entry, 12);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_agf, 224);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_agfl, 36);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_agi, 336);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_key, 8);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_rec, 16);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_bmdr_block, 4);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block, 72);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dinode, 176);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_disk_dquot, 104);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dqblk, 136);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dsb, 264);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dsymlink_hdr, 56);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_key, 4);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_inobt_rec, 16);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_timestamp, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_alloc_key_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t, 4);
> + XFS_CHECK_STRUCT_SIZE(xfs_alloc_rec_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_inobt_ptr_t, 4);
> +
> + /* dir/attr trees */
> + XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leaf_hdr, 80);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leafblock, 88);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_rmt_hdr, 56);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_da3_blkinfo, 56);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_da3_intnode, 64);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_da3_node_hdr, 64);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_blk_hdr, 48);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_data_hdr, 64);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free, 64);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_free_hdr, 64);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf, 64);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dir3_leaf_hdr, 64);
> + XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_entry_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_hdr_t, 32);
> + XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_map_t, 4);
> + XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_local_t, 4);
> + XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_remote_t, 12);
> + XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t, 40);
> + XFS_CHECK_STRUCT_SIZE(xfs_attr_shortform_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_da_blkinfo_t, 12);
> + XFS_CHECK_STRUCT_SIZE(xfs_da_intnode_t, 16);
> + XFS_CHECK_STRUCT_SIZE(xfs_da_node_entry_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_da_node_hdr_t, 16);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_free_t, 4);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_hdr_t, 16);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_unused_t, 6);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t, 16);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t, 16);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino4_t, 4);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino8_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_inou_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t, 8);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t, 16);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t, 16);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_tail_t, 4);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t, 3);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t, 10);
> + XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_off_t, 2);
> +
> + /* log structures */
> + XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat, 24);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32, 28);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64, 32);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32, 28);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64, 32);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_extent_32, 12);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_extent_64, 16);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_icdinode, 176);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log, 28);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_ictimestamp, 8);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32, 52);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_64, 56);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat, 20);
> + XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header, 16);
> +}
> +
> +#endif /* __XFS_ONDISK_H */
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 36bd882..f63d212 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -45,6 +45,7 @@
> #include "xfs_filestream.h"
> #include "xfs_quota.h"
> #include "xfs_sysfs.h"
> +#include "xfs_ondisk.h"
>
> #include <linux/namei.h>
> #include <linux/init.h>
> @@ -1817,6 +1818,8 @@ init_xfs_fs(void)
> {
> int error;
>
> + xfs_check_ondisk_structs();
> +
> printk(KERN_INFO XFS_VERSION_STRING " with "
> XFS_BUILD_OPTIONS " enabled\n");
>
>
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