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btrbk: add support for zstd adaptive compression 

Requires zstd version >= 1.3.6
pull/409/head
ullr23@gmail.com 2021-06-07 00:03:47 -05:00 committed by Axel Burri
parent 907a5065ab
commit 322ae2c78f
2 changed files with 16 additions and 1 deletions
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13
btrbk
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@ -54,7 +54,7 @@ my %compression = (
xz => { name => 'xz', format => 'xz', compress_cmd => [ 'xz', '-c' ], decompress_cmd => [ 'xz', '-d', '-c' ], level_min => 0, level_max => 9, threads => '-T' },
lzo => { name => 'lzo', format => 'lzo', compress_cmd => [ 'lzop', '-c' ], decompress_cmd => [ 'lzop', '-d', '-c' ], level_min => 1, level_max => 9 },
lz4 => { name => 'lz4', format => 'lz4', compress_cmd => [ 'lz4', '-c' ], decompress_cmd => [ 'lz4', '-d', '-c' ], level_min => 1, level_max => 9 },
zstd => { name => 'zstd', format => 'zst', compress_cmd => [ 'zstd', '-c' ], decompress_cmd => [ 'zstd', '-d', '-c' ], level_min => 1, level_max => 19, threads => '-T', long => '--long=' },
zstd => { name => 'zstd', format => 'zst', compress_cmd => [ 'zstd', '-c' ], decompress_cmd => [ 'zstd', '-d', '-c' ], level_min => 1, level_max => 19, threads => '-T', long => '--long=', adapt => '--adapt' },
);
my $compress_format_alt = join '|', map { $_->{format} } values %compression; # note: this contains duplicate alternations
@ -110,6 +110,7 @@ my %config_options = (
stream_compress_level => { default => "default", accept => [ "default" ], accept_numeric => 1 },
stream_compress_long => { default => "default", accept => [ "default" ], accept_numeric => 1 },
stream_compress_threads => { default => "default", accept => [ "default" ], accept_numeric => 1 },
stream_compress_adapt => { default => undef, accept => [ "yes", "no" ] },
raw_target_compress => { default => undef, accept => [ "no", (keys %compression) ] },
raw_target_compress_level => { default => "default", accept => [ "default" ], accept_numeric => 1 },
@ -737,6 +738,15 @@ sub compress_cmd_text($;$)
WARN_ONCE "Long distance matching is not supported for '$cc->{name}', ignoring";
}
}
if(defined($def->{adapt})) {
my $adapt_opt = $cc->{adapt};
if($adapt_opt) {
push @cmd, $adapt_opt;
}
else {
WARN_ONCE "Adaptive compression is not supported for '$cc->{name}', ignoring";
}
}
return { cmd_text => join(' ', @cmd) };
}
@ -3994,6 +4004,7 @@ sub config_compress_hash($$)
level => config_key($config, $config_key . "_level"),
long => config_key($config, $config_key . "_long"),
threads => config_key($config, $config_key . "_threads"),
adapt => config_key($config, $config_key . "_adapt"),
};
}

4
doc/btrbk.conf.5.asciidoc
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@ -307,6 +307,10 @@ option in ssh_config(5).
Number of threads to use for <compress_command>. Only supported
for "pigz", "pbzip2", "zstd" and recent versions of "xz".
*stream_compress_adapt* default|<number>::
Enable adaptive compression for <compress_command>. Only supported
for "zstd" (version >= 1.3.6).
*stream_buffer* <size>|no::
Add a buffer to the btrfs send stream (locally, on uncompressed
data), with a maximum size of '<size>'. This can give a speed