On Tue, Jan 07, 2020 at 08:18:25PM -0800, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > Increase XFS_BLF_DATAMAP_SIZE by 1 to fill in the implied padding at the > end of struct xfs_buf_log_format. This makes the size consistent so > that we can check it in xfs_ondisk.h, and will be needed once we start > logging attribute values. > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > --- > fs/xfs/libxfs/xfs_log_format.h | 9 +++++---- > fs/xfs/xfs_ondisk.h | 1 + > 2 files changed, 6 insertions(+), 4 deletions(-) > > > diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h > index 8ef31d71a9c7..5d8eb8978c33 100644 > --- a/fs/xfs/libxfs/xfs_log_format.h > +++ b/fs/xfs/libxfs/xfs_log_format.h > @@ -462,11 +462,12 @@ static inline uint xfs_log_dinode_size(int version) > #define XFS_BLF_GDQUOT_BUF (1<<4) > > /* > - * This is the structure used to lay out a buf log item in the > - * log. The data map describes which 128 byte chunks of the buffer > - * have been logged. > + * This is the structure used to lay out a buf log item in the log. The data > + * map describes which 128 byte chunks of the buffer have been logged. Note > + * that XFS_BLF_DATAMAP_SIZE is an odd number so that the structure size will > + * be consistent between 32-bit and 64-bit platforms. > */ > -#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD) > +#define XFS_BLF_DATAMAP_SIZE (1 + ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)) Shouldn't this do something like: #define __XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD) #define XFS_BLF_DATAMAP_SIZE (__XFS_BLF_DATAMAP_SIZE + (__XFS_BLF_DATAMAP_SIZE & 1)) or use an appropriate round up macro so that if we change the log chunk size or the max block size, it still evaluates correctly for all platforms? /me has prototype patches around somewhere that change XFS_BLF_CHUNK... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx
