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xfs: use static_assert to check struct sizes and offsets

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Use the compiler-provided static_assert built-in from C11 instead of
the kernel-specific BUILD_BUG_ON_MSG for the structure size and offset
checks in xfs_ondisk.  This not only gives slightly nicer error messages
in case things go south, but can also be trivially used as-is in
userspace.

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: Chandan Babu R <chandanbabu@kernel.org>
This commit is contained in:
Christoph Hellwig 2023-12-04 21:07:18 +01:00 committed by Chandan Babu R
parent fd45ddb9dd
commit c12c50393c
1 changed files with 4 additions and 4 deletions
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8
fs/xfs/xfs_ondisk.h
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@ -7,16 +7,16 @@
#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_assert(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), \
static_assert(offsetof(structname, member) == (off), \
"XFS: offsetof(" #structname ", " #member ") is wrong, " \
"expected " #off)
#define XFS_CHECK_VALUE(value, expected) \
BUILD_BUG_ON_MSG((value) != (expected), \
static_assert((value) == (expected), \
"XFS: value of " #value " is wrong, expected " #expected)
static inline void __init