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linux/fs/xfs/libxfs/xfs_ondisk.h
Christoph Hellwig fe985b910e xfs: remove xlog_in_core_2_t 
xlog_in_core_2_t is a really odd type, not only is it grossly
misnamed because it actually is an on-disk structure, but it also
reprents the actual on-disk structure in a rather odd way.

A v1 or small v2 log header look like:

	+-----------------------+
	|      xlog_record      |
	+-----------------------+

while larger v2 log headers look like:

	+-----------------------+
	|      xlog_record      |
	+-----------------------+
	|  xlog_rec_ext_header  |
	+-------------------+---+
	|         .....         |
	+-----------------------+
	|  xlog_rec_ext_header  |
	+-----------------------+

I.e., the ext headers are a variable sized array at the end of the
header.  So instead of declaring a union of xlog_rec_header,
xlog_rec_ext_header and padding to BBSIZE, add the proper padding to
struct struct xlog_rec_header and struct xlog_rec_ext_header, and
add a variable sized array of the latter to the former.  This also
exposes the somewhat unusual scope of the log checksums, which is
made explicitly now by adding proper padding and macro designating
the actual payload length.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
2025-11-12 11:09:25 +01:00

307 lines
14 KiB
C
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// 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) \
static_assert(sizeof(structname) == (size), \
"XFS: sizeof(" #structname ") is wrong, expected " #size)
#define XFS_CHECK_OFFSET(structname, member, off) \
static_assert(offsetof(structname, member) == (off), \
"XFS: offsetof(" #structname ", " #member ") is wrong, " \
"expected " #off)
#define XFS_CHECK_VALUE(value, expected) \
static_assert((value) == (expected), \
"XFS: value of " #value " is wrong, expected " #expected)
#define XFS_CHECK_SB_OFFSET(field, offset) \
XFS_CHECK_OFFSET(struct xfs_dsb, field, offset); \
XFS_CHECK_OFFSET(struct xfs_sb, field, offset);
static inline void __init
xfs_check_ondisk_structs(void)
{
/* 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_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_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_dsymlink_hdr, 56);
XFS_CHECK_STRUCT_SIZE(xfs_timestamp_t, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_legacy_timestamp, 8);
/* space btrees */
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_alloc_rec, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block, 72);
XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_lhdr, 64);
XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_shdr, 48);
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_alloc_key_t, 8);
XFS_CHECK_STRUCT_SIZE(xfs_alloc_ptr_t, 4);
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);
XFS_CHECK_STRUCT_SIZE(xfs_bmdr_key_t, 8);
/* 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(struct xfs_attr_leaf_entry, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_attr_leaf_hdr, 32);
XFS_CHECK_STRUCT_SIZE(struct xfs_attr_leaf_map, 4);
XFS_CHECK_STRUCT_SIZE(struct xfs_attr_leaf_name_local, 4);
/* realtime structures */
XFS_CHECK_STRUCT_SIZE(struct xfs_rtsb, 56);
XFS_CHECK_STRUCT_SIZE(union xfs_rtword_raw, 4);
XFS_CHECK_STRUCT_SIZE(union xfs_suminfo_raw, 4);
XFS_CHECK_STRUCT_SIZE(struct xfs_rtbuf_blkinfo, 48);
XFS_CHECK_STRUCT_SIZE(xfs_rtrmap_ptr_t, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_rtrmap_root, 4);
XFS_CHECK_STRUCT_SIZE(xfs_rtrefcount_ptr_t, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_rtrefcount_root, 4);
/*
* m68k has problems with struct xfs_attr_leaf_name_remote, 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(struct xfs_attr_leaf_name_remote, 12);
*/
XFS_CHECK_OFFSET(struct xfs_attr_leaf_name_local, valuelen, 0);
XFS_CHECK_OFFSET(struct xfs_attr_leaf_name_local, namelen, 2);
XFS_CHECK_OFFSET(struct xfs_attr_leaf_name_local, nameval, 3);
XFS_CHECK_OFFSET(struct xfs_attr_leaf_name_remote, valueblk, 0);
XFS_CHECK_OFFSET(struct xfs_attr_leaf_name_remote, valuelen, 4);
XFS_CHECK_OFFSET(struct xfs_attr_leaf_name_remote, namelen, 8);
XFS_CHECK_OFFSET(struct xfs_attr_leaf_name_remote, name, 9);
XFS_CHECK_STRUCT_SIZE(struct xfs_attr_leafblock, 32);
XFS_CHECK_STRUCT_SIZE(struct xfs_attr_sf_hdr, 4);
XFS_CHECK_OFFSET(struct xfs_attr_sf_hdr, totsize, 0);
XFS_CHECK_OFFSET(struct xfs_attr_sf_hdr, count, 2);
XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, namelen, 0);
XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, valuelen, 1);
XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, flags, 2);
XFS_CHECK_OFFSET(struct xfs_attr_sf_entry, nameval, 3);
XFS_CHECK_STRUCT_SIZE(struct xfs_da_blkinfo, 12);
XFS_CHECK_STRUCT_SIZE(struct xfs_da_intnode, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_da_node_entry, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_da_node_hdr, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_data_free, 4);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_data_hdr, 16);
XFS_CHECK_OFFSET(struct xfs_dir2_data_unused, freetag, 0);
XFS_CHECK_OFFSET(struct xfs_dir2_data_unused, length, 2);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_free_hdr, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_free, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf_entry, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf_hdr, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf_tail, 4);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_sf_entry, 3);
XFS_CHECK_OFFSET(struct xfs_dir2_sf_entry, namelen, 0);
XFS_CHECK_OFFSET(struct xfs_dir2_sf_entry, offset, 1);
XFS_CHECK_OFFSET(struct xfs_dir2_sf_entry, name, 3);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_sf_hdr, 10);
XFS_CHECK_STRUCT_SIZE(struct xfs_parent_rec, 12);
/* ondisk dir/attr structures from xfs/122 */
XFS_CHECK_STRUCT_SIZE(struct xfs_attr_sf_entry, 3);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_data_free, 4);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_data_hdr, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_data_unused, 6);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_free, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_free_hdr, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf_entry, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf_hdr, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_leaf_tail, 4);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_sf_entry, 3);
XFS_CHECK_STRUCT_SIZE(struct xfs_dir2_sf_hdr, 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_STRUCT_SIZE(struct xlog_rec_header, 512);
XFS_CHECK_STRUCT_SIZE(struct xlog_rec_ext_header, 512);
XFS_CHECK_OFFSET(struct xlog_rec_header, h_reserved, 328);
XFS_CHECK_OFFSET(struct xlog_rec_ext_header, xh_reserved, 260);
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);
/* ondisk log structures from xfs/122 */
XFS_CHECK_STRUCT_SIZE(struct xfs_unmount_log_format, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_xmd_log_format, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_xmi_log_format, 88);
/* parent pointer ioctls */
XFS_CHECK_STRUCT_SIZE(struct xfs_getparents_rec, 32);
XFS_CHECK_STRUCT_SIZE(struct xfs_getparents, 40);
XFS_CHECK_STRUCT_SIZE(struct xfs_getparents_by_handle, 64);
/*
* 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);
/* superblock field checks we got from xfs/122 */
XFS_CHECK_STRUCT_SIZE(struct xfs_dsb, 304);
XFS_CHECK_STRUCT_SIZE(struct xfs_sb, 304);
XFS_CHECK_SB_OFFSET(sb_magicnum, 0);
XFS_CHECK_SB_OFFSET(sb_blocksize, 4);
XFS_CHECK_SB_OFFSET(sb_dblocks, 8);
XFS_CHECK_SB_OFFSET(sb_rblocks, 16);
XFS_CHECK_SB_OFFSET(sb_rextents, 24);
XFS_CHECK_SB_OFFSET(sb_uuid, 32);
XFS_CHECK_SB_OFFSET(sb_logstart, 48);
XFS_CHECK_SB_OFFSET(sb_rootino, 56);
XFS_CHECK_SB_OFFSET(sb_rbmino, 64);
XFS_CHECK_SB_OFFSET(sb_rsumino, 72);
XFS_CHECK_SB_OFFSET(sb_rextsize, 80);
XFS_CHECK_SB_OFFSET(sb_agblocks, 84);
XFS_CHECK_SB_OFFSET(sb_agcount, 88);
XFS_CHECK_SB_OFFSET(sb_rbmblocks, 92);
XFS_CHECK_SB_OFFSET(sb_logblocks, 96);
XFS_CHECK_SB_OFFSET(sb_versionnum, 100);
XFS_CHECK_SB_OFFSET(sb_sectsize, 102);
XFS_CHECK_SB_OFFSET(sb_inodesize, 104);
XFS_CHECK_SB_OFFSET(sb_inopblock, 106);
XFS_CHECK_SB_OFFSET(sb_blocklog, 120);
XFS_CHECK_SB_OFFSET(sb_fname[12], 120);
XFS_CHECK_SB_OFFSET(sb_sectlog, 121);
XFS_CHECK_SB_OFFSET(sb_inodelog, 122);
XFS_CHECK_SB_OFFSET(sb_inopblog, 123);
XFS_CHECK_SB_OFFSET(sb_agblklog, 124);
XFS_CHECK_SB_OFFSET(sb_rextslog, 125);
XFS_CHECK_SB_OFFSET(sb_inprogress, 126);
XFS_CHECK_SB_OFFSET(sb_imax_pct, 127);
XFS_CHECK_SB_OFFSET(sb_icount, 128);
XFS_CHECK_SB_OFFSET(sb_ifree, 136);
XFS_CHECK_SB_OFFSET(sb_fdblocks, 144);
XFS_CHECK_SB_OFFSET(sb_frextents, 152);
XFS_CHECK_SB_OFFSET(sb_uquotino, 160);
XFS_CHECK_SB_OFFSET(sb_gquotino, 168);
XFS_CHECK_SB_OFFSET(sb_qflags, 176);
XFS_CHECK_SB_OFFSET(sb_flags, 178);
XFS_CHECK_SB_OFFSET(sb_shared_vn, 179);
XFS_CHECK_SB_OFFSET(sb_inoalignmt, 180);
XFS_CHECK_SB_OFFSET(sb_unit, 184);
XFS_CHECK_SB_OFFSET(sb_width, 188);
XFS_CHECK_SB_OFFSET(sb_dirblklog, 192);
XFS_CHECK_SB_OFFSET(sb_logsectlog, 193);
XFS_CHECK_SB_OFFSET(sb_logsectsize, 194);
XFS_CHECK_SB_OFFSET(sb_logsunit, 196);
XFS_CHECK_SB_OFFSET(sb_features2, 200);
XFS_CHECK_SB_OFFSET(sb_bad_features2, 204);
XFS_CHECK_SB_OFFSET(sb_features_compat, 208);
XFS_CHECK_SB_OFFSET(sb_features_ro_compat, 212);
XFS_CHECK_SB_OFFSET(sb_features_incompat, 216);
XFS_CHECK_SB_OFFSET(sb_features_log_incompat, 220);
XFS_CHECK_SB_OFFSET(sb_crc, 224);
XFS_CHECK_SB_OFFSET(sb_spino_align, 228);
XFS_CHECK_SB_OFFSET(sb_pquotino, 232);
XFS_CHECK_SB_OFFSET(sb_lsn, 240);
XFS_CHECK_SB_OFFSET(sb_meta_uuid, 248);
XFS_CHECK_SB_OFFSET(sb_metadirino, 264);
XFS_CHECK_SB_OFFSET(sb_rgcount, 272);
XFS_CHECK_SB_OFFSET(sb_rgextents, 276);
XFS_CHECK_SB_OFFSET(sb_rgblklog, 280);
XFS_CHECK_SB_OFFSET(sb_pad, 281);
XFS_CHECK_SB_OFFSET(sb_rtstart, 288);
XFS_CHECK_SB_OFFSET(sb_rtreserved, 296);
}
#endif /* __XFS_ONDISK_H */
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