linux-kernel - Re: [PATCH v2 0/4] Add xxhash and zstd modules

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Message-ID: <8C0B630F-01E0-459E-BAD6-44F8A68E1858@fb.com>
Date:   Fri, 30 Jun 2017 19:52:10 +0000
From:   Nick Terrell <terrelln@...com>
To:     Timofey Titovets <nefelim4ag@...il.com>
CC:     Kernel Team <Kernel-team@...com>, Chris Mason <clm@...com>,
        Yann Collet <cyan@...com>, Adam Borowski <kilobyte@...band.pl>,
        David Sterba <dsterba@...e.cz>,
        "squashfs-devel@...ts.sourceforge.net" 
        <squashfs-devel@...ts.sourceforge.net>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] Add xxhash and zstd modules

> If i understood all correctly,
> zstd can compress (decompress) data in way compatible with gzip (zlib)
> Do that also true for in kernel library?

The zstd command line tool can decompress gzip/zlib compressed data, and
can compress in the gzip format. However, the zstd format is not compatible
with zlib, so gzip/zlib cannot decompress zstd compressed data. The zstd
kernel module can only compress and decompress the zstd format, and can't
decompress zlib/gzip compressed data.