linux-ext4 - Re: [PATCH 1/9] ext2fs: Drop HAS

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Date:   Mon, 12 Jul 2021 12:20:03 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Jan Kara <jack@...e.cz>
Cc:     Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/9] ext2fs: Drop HAS_SNAPSHOT feature

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. 

Cheers, Andreas

> On Jul 12, 2021, at 09:43, Jan Kara <jack@...e.cz> wrote:
> 
> It has never been implemented and is dead for quite some time and
> unused AFAICT.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
> 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
>