Hello,
On Mon 12-07-21 12:20:03, Andreas Dilger wrote:
> NAK.
>
> We are working on a snapshot implementation for ext4, it is
> just taking a lot longer that I thought it would to complete.
>
> There isn't any shortage of these feature bits, so no reason to re-use them.
Sure. I thought this feature bit was a leftover from experimental ext4
snapshot feature Amir Goldstein was playing with some 10-15 years ago and
which never completed. If there's somebody working on this, I'll allocate a
different bit.
Honza
>
> Cheers, Andreas
>
> > On Jul 12, 2021, at 09:43, Jan Kara <jack@xxxxxxx> wrote:
> >
> > It has never been implemented and is dead for quite some time and
> > unused AFAICT.
> >
> > Signed-off-by: Jan Kara <jack@xxxxxxx>
> > ---
> > lib/ext2fs/ext2_fs.h | 2 --
> > 1 file changed, 2 deletions(-)
> >
> > diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> > index e92a045205a9..6f1d5db4b482 100644
> > --- a/lib/ext2fs/ext2_fs.h
> > +++ b/lib/ext2fs/ext2_fs.h
> > @@ -825,7 +825,6 @@ struct ext2_super_block {
> > #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
> > #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
> > #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
> > -#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
> > #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
> > #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
> > /*
> > @@ -926,7 +925,6 @@ EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE)
> > EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM)
> > EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK)
> > EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE)
> > -EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT)
> > EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA)
> > EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC)
> > EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM)
> > --
> > 2.26.2
> >
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
