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authorDarrick J. Wong <darrick.wong@oracle.com>2016-03-09 08:15:14 +1100
committerDave Chinner <david@fromorbit.com>2016-03-09 08:15:14 +1100
commit30cbc591c34e680e8b5d6d675ea49effe42a0570 (patch)
tree8580f806e3ebe6f762bd4fb472d29539bd736034 /fs/xfs
parent5110cd82ca90e6ce04c1c3264587c183aad1f179 (diff)
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>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_ondisk.h117
-rw-r--r--fs/xfs/xfs_super.c3
2 files changed, 120 insertions, 0 deletions
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
new file mode 100644
index 000000000000..184c44effdd5
--- /dev/null
+++ b/fs/xfs/xfs_ondisk.h
@@ -0,0 +1,117 @@
+/*
+ * 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(" \
+ #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);
+
+ /*
+ * m68k has problems with xfs_attr_leaf_name_remote_t, but we pad it to
+ * 4 bytes anyway so it's not obviously a problem. Hence for the moment
+ * we don't check this structure. This can be re-instated when the attr
+ * definitions are updated to use c99 VLA definitions.
+ *
+ 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_log_dinode, 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 59c9b7bd958d..3bd2027a7ea6 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");