linux-kernel - [PATCH] xfs: Fix xfs_dir2_sf_entry

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Date:   Thu,  9 Jan 2020 14:14:59 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     darrick.wong@...cle.com, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     vincenzo.frascino@....com
Subject: [PATCH] xfs: Fix xfs_dir2_sf_entry_t size check

xfs_check_ondisk_structs() verifies that the sizes of the data types
used by xfs are correct via the XFS_CHECK_STRUCT_SIZE() macro.

xfs_dir2_sf_entry_t size is set erroneously to 3 which breaks the
compilation with the assertion below:

In file included from linux/include/linux/string.h:6,
                 from linux/include/linux/uuid.h:12,
                 from linux/fs/xfs/xfs_linux.h:10,
                 from linux/fs/xfs/xfs.h:22,
                 from linux/fs/xfs/xfs_super.c:7:
In function ‘xfs_check_ondisk_structs’,
    inlined from ‘init_xfs_fs’ at linux/fs/xfs/xfs_super.c:2025:2:
linux/include/linux/compiler.h:350:38:
    error: call to ‘__compiletime_assert_107’ declared with attribute
    error: XFS: sizeof(xfs_dir2_sf_entry_t) is wrong, expected 3
    _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)

Restore the correct behavior defining the correct size.

Cc: "Darrick J. Wong" <darrick.wong@...cle.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
---
 fs/xfs/xfs_ondisk.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index b6701b4f59a9..ee487ddc60c7 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -104,7 +104,7 @@ xfs_check_ondisk_structs(void)
 	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_entry_t,		4);
 	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);
-- 
2.24.1