From: Darrick J. Wong <djwong@xxxxxxxxxx> Replace this open-coded logic with the kernel's offsetofend macro before we start adding more in the next patch. Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx> --- include/xfs.h | 15 +++++++++++++++ repair/agheader.c | 21 +++++++-------------- 2 files changed, 22 insertions(+), 14 deletions(-) diff --git a/include/xfs.h b/include/xfs.h index e97158c8d223f5..a2f159a586ee71 100644 --- a/include/xfs.h +++ b/include/xfs.h @@ -38,8 +38,23 @@ extern int xfs_assert_largefile[sizeof(off_t)-8]; #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) #endif +/** + * sizeof_field() - Report the size of a struct field in bytes + * + * @TYPE: The structure containing the field of interest + * @MEMBER: The field to return the size of + */ #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) +/** + * offsetofend() - Report the offset of a struct field within the struct + * + * @TYPE: The type of the structure + * @MEMBER: The member within the structure to get the end offset of + */ +#define offsetofend(TYPE, MEMBER) \ + (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) + #include <xfs/xfs_types.h> /* Include deprecated/compat pre-vfs xfs-specific symbols */ #include <xfs/xfs_fs_compat.h> diff --git a/repair/agheader.c b/repair/agheader.c index 5d4ca26cfb6155..daadacd1c43634 100644 --- a/repair/agheader.c +++ b/repair/agheader.c @@ -358,26 +358,19 @@ secondary_sb_whack( * size is the size of data which is valid for this sb. */ if (xfs_sb_version_hasmetadir(sb)) - size = offsetof(struct xfs_dsb, sb_metadirino) - + sizeof(sb->sb_metadirino); + size = offsetofend(struct xfs_dsb, sb_metadirino); else if (xfs_sb_version_hasmetauuid(sb)) - size = offsetof(struct xfs_dsb, sb_meta_uuid) - + sizeof(sb->sb_meta_uuid); + size = offsetofend(struct xfs_dsb, sb_meta_uuid); else if (xfs_sb_version_hascrc(sb)) - size = offsetof(struct xfs_dsb, sb_lsn) - + sizeof(sb->sb_lsn); + size = offsetofend(struct xfs_dsb, sb_lsn); else if (xfs_sb_version_hasmorebits(sb)) - size = offsetof(struct xfs_dsb, sb_bad_features2) - + sizeof(sb->sb_bad_features2); + size = offsetofend(struct xfs_dsb, sb_bad_features2); else if (xfs_sb_version_haslogv2(sb)) - size = offsetof(struct xfs_dsb, sb_logsunit) - + sizeof(sb->sb_logsunit); + size = offsetofend(struct xfs_dsb, sb_logsunit); else if (xfs_sb_version_hassector(sb)) - size = offsetof(struct xfs_dsb, sb_logsectsize) - + sizeof(sb->sb_logsectsize); + size = offsetofend(struct xfs_dsb, sb_logsectsize); else /* only support dirv2 or more recent */ - size = offsetof(struct xfs_dsb, sb_dirblklog) - + sizeof(sb->sb_dirblklog); + size = offsetofend(struct xfs_dsb, sb_dirblklog); /* Check the buffer we read from disk for garbage outside size */ for (ip = (char *)sbuf->b_addr + size;
