Provide a dumb BUILD_BUG_ON_MSG and import the kernel xfs_ondisk.h file
so that libxfs_init can check the size of all relevant on-disk
structures.
This seems like a better way to verify the struct size in userspace
compared to the xfs/122 test in xfstests that needs constant updates.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
Note that xfs_ondisk.h should move to libxfs if this gets applied.
include/xfs.h | 4 +
libxfs/init.c | 7 ++
libxfs/xfs_ondisk.h | 195 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 206 insertions(+)
create mode 100644 libxfs/xfs_ondisk.h
diff --git a/include/xfs.h b/include/xfs.h
index e97158c8d..796af1f37 100644
--- a/include/xfs.h
+++ b/include/xfs.h
@@ -38,6 +38,10 @@ extern int xfs_assert_largefile[sizeof(off_t)-8];
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
#endif
+#ifndef BUILD_BUG_ON_MSG
+#define BUILD_BUG_ON_MSG(a, b) BUILD_BUG_ON(a)
+#endif
+
#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
#include <xfs/xfs_types.h>
diff --git a/libxfs/init.c b/libxfs/init.c
index ce6e62cde..aa37ef651 100644
--- a/libxfs/init.c
+++ b/libxfs/init.c
@@ -23,6 +23,11 @@
#include "xfs_refcount_btree.h"
#include "libfrog/platform.h"
+#include "xfs_format.h"
+#include "xfs_da_format.h"
+#include "xfs_log_format.h"
+#include "xfs_ondisk.h"
+
#include "libxfs.h" /* for now */
#ifndef HAVE_LIBURCU_ATOMIC64
@@ -317,6 +322,8 @@ libxfs_init(libxfs_init_t *a)
int rval = 0;
int flags;
+ xfs_check_ondisk_structs();
+
dpath[0] = logpath[0] = rtpath[0] = '\0';
dname = a->dname;
logname = a->logname;
diff --git a/libxfs/xfs_ondisk.h b/libxfs/xfs_ondisk.h
new file mode 100644
index 000000000..c4cc99b70
--- /dev/null
+++ b/libxfs/xfs_ondisk.h
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2016 Oracle.
+ * All Rights Reserved.
+ */
+#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)
+
+#define XFS_CHECK_OFFSET(structname, member, off) \
+ BUILD_BUG_ON_MSG(offsetof(structname, member) != (off), \
+ "XFS: offsetof(" #structname ", " #member ") is wrong, " \
+ "expected " #off)
+
+#define XFS_CHECK_VALUE(value, expected) \
+ BUILD_BUG_ON_MSG((value) != (expected), \
+ "XFS: value of " #value " is wrong, expected " #expected)
+
+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, 344);
+ 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_shdr, 48);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_lhdr, 64);
+ 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_refcount_key, 4);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_refcount_rec, 12);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_key, 20);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_rmap_rec, 24);
+ XFS_CHECK_STRUCT_SIZE(xfs_timestamp_t, 8);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_legacy_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);
+ XFS_CHECK_STRUCT_SIZE(xfs_refcount_ptr_t, 4);
+ XFS_CHECK_STRUCT_SIZE(xfs_rmap_ptr_t, 4);
+
+ /* dir/attr trees */
+ XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leaf_hdr, 80);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_attr3_leafblock, 80);
+ 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_OFFSET(xfs_attr_leaf_name_local_t, valuelen, 0);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, namelen, 2);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, nameval, 3);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valueblk, 0);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valuelen, 4);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, namelen, 8);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, name, 9);
+ XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t, 32);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_attr_shortform, 4);
+ XFS_CHECK_OFFSET(struct xfs_attr_shortform, hdr.totsize, 0);
+ XFS_CHECK_OFFSET(struct xfs_attr_shortform, hdr.count, 2);
+ XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].namelen, 4);
+ XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].valuelen, 5);
+ XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].flags, 6);
+ XFS_CHECK_OFFSET(struct xfs_attr_shortform, list[0].nameval, 7);
+ 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_OFFSET(xfs_dir2_data_unused_t, freetag, 0);
+ XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, length, 2);
+ 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_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_OFFSET(xfs_dir2_sf_entry_t, namelen, 0);
+ XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, offset, 1);
+ XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, name, 3);
+ XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t, 10);
+
+ /* log structures */
+ XFS_CHECK_STRUCT_SIZE(struct xfs_buf_log_format, 88);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat, 24);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_32, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64, 16);
+ 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(xfs_log_timestamp_t, 8);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_log_legacy_timestamp, 8);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format_32, 52);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format, 56);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat, 20);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_attri_log_format, 40);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_attrd_log_format, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_bui_log_format, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_bud_log_format, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_cui_log_format, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_cud_log_format, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_rui_log_format, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_rud_log_format, 16);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_map_extent, 32);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_phys_extent, 16);
+
+ XFS_CHECK_OFFSET(struct xfs_bui_log_format, bui_extents, 16);
+ XFS_CHECK_OFFSET(struct xfs_cui_log_format, cui_extents, 16);
+ XFS_CHECK_OFFSET(struct xfs_rui_log_format, rui_extents, 16);
+ XFS_CHECK_OFFSET(struct xfs_efi_log_format, efi_extents, 16);
+ XFS_CHECK_OFFSET(struct xfs_efi_log_format_32, efi_extents, 16);
+ XFS_CHECK_OFFSET(struct xfs_efi_log_format_64, efi_extents, 16);
+
+ /*
+ * The v5 superblock format extended several v4 header structures with
+ * additional data. While new fields are only accessible on v5
+ * superblocks, it's important that the v5 structures place original v4
+ * fields/headers in the correct location on-disk. For example, we must
+ * be able to find magic values at the same location in certain blocks
+ * regardless of superblock version.
+ *
+ * The following checks ensure that various v5 data structures place the
+ * subset of v4 metadata associated with the same type of block at the
+ * start of the on-disk block. If there is no data structure definition
+ * for certain types of v4 blocks, traverse down to the first field of
+ * common metadata (e.g., magic value) and make sure it is at offset
+ * zero.
+ */
+ XFS_CHECK_OFFSET(struct xfs_dir3_leaf, hdr.info.hdr, 0);
+ XFS_CHECK_OFFSET(struct xfs_da3_intnode, hdr.info.hdr, 0);
+ XFS_CHECK_OFFSET(struct xfs_dir3_data_hdr, hdr.magic, 0);
+ XFS_CHECK_OFFSET(struct xfs_dir3_free, hdr.hdr.magic, 0);
+ XFS_CHECK_OFFSET(struct xfs_attr3_leafblock, hdr.info.hdr, 0);
+
+ XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat, 192);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers, 24);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_req, 64);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers_req, 64);
+
+ /*
+ * Make sure the incore inode timestamp range corresponds to hand
+ * converted values based on the ondisk format specification.
+ */
+ XFS_CHECK_VALUE(XFS_BIGTIME_TIME_MIN - XFS_BIGTIME_EPOCH_OFFSET,
+ XFS_LEGACY_TIME_MIN);
+ XFS_CHECK_VALUE(XFS_BIGTIME_TIME_MAX - XFS_BIGTIME_EPOCH_OFFSET,
+ 16299260424LL);
+
+ /* Do the same with the incore quota expiration range. */
+ XFS_CHECK_VALUE(XFS_DQ_BIGTIME_EXPIRY_MIN << XFS_DQ_BIGTIME_SHIFT, 4);
+ XFS_CHECK_VALUE(XFS_DQ_BIGTIME_EXPIRY_MAX << XFS_DQ_BIGTIME_SHIFT,
+ 16299260424LL);
+}
+
+#endif /* __XFS_ONDISK_H */
--
2.39.2
