On Mar 21, 2007 19:42 +0530, Kalpak Shah wrote:
> Index: e2fsprogs-1.40/lib/ext2fs/ext2_fs.h
> ===================================================================
> --- e2fsprogs-1.40.orig/lib/ext2fs/ext2_fs.h
> +++ e2fsprogs-1.40/lib/ext2fs/ext2_fs.h
> @@ -635,6 +635,7 @@ struct ext2_super_block {
> #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
> #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
> EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
> + EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
> EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
>
> /*
> Index: e2fsprogs-1.40/lib/ext2fs/ext2fs.h
> ===================================================================
> --- e2fsprogs-1.40.orig/lib/ext2fs/ext2fs.h
> +++ e2fsprogs-1.40/lib/ext2fs/ext2fs.h
> @@ -460,7 +463,8 @@ typedef struct ext2_icount *ext2_icount_
> EXT3_FEATURE_INCOMPAT_RECOVER)
> #endif
> #define EXT2_LIB_FEATURE_RO_COMPAT_SUPP
> (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
> - EXT2_FEATURE_RO_COMPAT_LARGE_FILE)
> + EXT2_FEATURE_RO_COMPAT_LARGE_FILE|\
> + EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
Ted, can you give a bit of clarification for these different masks.
For EXT2_LIB_SOFTSUPP_RO_COMPAT, it says "These features are only allowed
if EXT2_FLAG_SOFTSUPP_FEATURES is passed to ext2fs_openfs()". If the patch
from Kalpak adds DIR_NLINK to EXT2_LIB_FEATURE_RO_COMPAT_SUPP, does that
mean we should remove it from EXT2_FLAG_SOFTSUPP_FEATURES?
Also, I notice in ext2fs_open2() that there is a bit of code:
#ifdef EXT2_LIB_SOFTSUPP_RO_COMPAT
if (flags & EXT2_FLAG_SOFTSUPP_FEATURES)
features &= !EXT2_LIB_SOFTSUPP_RO_COMPAT;
#endif
But what does "!EXT2_LIB_SOFTSUPP_RO_COMPAT" really mean? Should this be
~EXT2_LIB_SOFTSUPP_RO_COMPAT? Should it be instead:
features &= ~(EXT2_LIB_SOFTSUPP_RO_COMPAT|EXT2_LIB_FEATURE_RO_COMPAT_SUPP)
so that we don't mask out all of the features that are NOT in
SOFTSUPP_RO_COMPAT? Otherwise we've just broken e2fsprogs feature compat
support badly I think. A similar hunk exists for EXT2_LIB_SOFTSUPP_INCOMPAT.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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