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btrbk: extents-diff: add (hidden) option: ignore_extent_data_inline

pull/358/head
Axel Burri 2020-11-08 20:59:11 +01:00
parent 0719fc415d
commit 208fc36231
1 changed files with 28 additions and 15 deletions
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@ -145,6 +145,7 @@ my %config_options = (
archive_exclude_older => { default => undef, accept => [ "yes", "no" ] },
cache_dir => { default => undef, accept_file => { absolute => 1 }, allow_multiple => 1, context => [ "global" ] },
ignore_extent_data_inline => { default => "yes", accept => [ "yes", "no" ] },
# deprecated options
ssh_port => { default => "default", accept => [ "default" ], accept_numeric => 1,
@ -2328,7 +2329,7 @@ sub filefrag_extentmap($)
my $vol = shift || die;
my $starttime = time;
INFO("Fetching extent information for: $vol->{PRINT}");
INFO("Fetching extent information (filefrag) for: $vol->{PRINT}");
# NOTE: this returns exitstatus=0 if file is not found, or no files found
my $ret = run_cmd({ cmd => [ 'find', { unsafe => $vol->{PATH} }, '-xdev', '-type', 'f',
@ -2338,18 +2339,32 @@ sub filefrag_extentmap($)
ERROR "Failed to fetch extent map for: $vol->{PRINT}", @stderr;
return undef;
}
WARN_ONCE "Configuration option \"ignore_extent_data_inline=no\" not available for filefrag (please install \"IO::AIO\" perl module)" unless(config_key($vol, "ignore_extent_data_inline"));
my @range; # array of [start,end]
my $extents = 0;
foreach (@$ret) {
#my $file = $1 if(/^File size of (.*?) is/);
if(/^\s*[0-9]+:\s*[0-9]+\.\.\s*[0-9]+:\s*([0-9]+)\.\.\s*([0-9]+):/) {
$extents++;
next if /inline/; # ignore inline data, this seems wrong
# NOTE: filefrag (v1.45.5) returns wrong (?) physical_offset for
# "inline" regions unless run with `-b1` (blocksize=1) option.
#
# For btrfs file systems it does not make much sense to consider
# the "inline" extents anyways: these are stored in metadata
# section and are not really part of the used disk space.
#
# # filefrag -v MYFILE
# File size of MYFILE is 2307 (1 block of 4096 bytes)
# ext: logical_offset: physical_offset: length: expected: flags:
# 0: 0.. 4095: 0.. 4095: 4096: last,not_aligned,inline,eof
# # filefrag -v -b1 MYFILE
# File size of MYFILE is 2307 (4096 block of 1 bytes)
# ext: logical_offset: physical_offset: length: expected: flags:
# 0: 0.. 4095: 0.. 4095: 4096: last,not_aligned,inline,eof
next if(/inline/);
push @range, [ $1, $2 ];
}
}
DEBUG("Parsed " . scalar(@range) . " regions in " . (time - $starttime) . "s for: $vol->{PRINT}");
DEBUG("Ignored " . ($extents - scalar(@range)) . " \"inline\" extents for: $vol->{PRINT}");
return extentmap_merge(\@range);
}
@ -2359,6 +2374,7 @@ sub aio_extentmap($)
{
my $vol = shift || die;
my $starttime = time;
my $ignore_inline = config_key($vol, "ignore_extent_data_inline");
INFO("Fetching extent information (IO::AIO) for: $vol->{PRINT}");
@ -2378,7 +2394,7 @@ sub aio_extentmap($)
# Note: aio_fiemap returns byte range (not blocks)
my @range;
my $count = 0;
my $inline = 0;
my $inline_count = 0;
foreach my $file (@$ret) {
IO::AIO::aio_open($file, IO::AIO::O_RDONLY(), 0, sub {
return unless($_[0]); # graceful abort on file open errors (check $count below)
@ -2386,26 +2402,23 @@ sub aio_extentmap($)
$count++;
foreach(@{$_[0]}) { # [$logical, $physical, $length, $flags]
if($_->[3] & IO::AIO::FIEMAP_EXTENT_DATA_INLINE()) {
# ignore inline data: for some reason, filefrag reports different size (x 4096 ?)
$inline++;
next;
WARN_ONCE "Ambigous inline region [$_->[1] .. $_->[1] + $_->[2] - 1] for $file" if(!$ignore_inline && (($_->[1] != 0) || ($_->[2] != 4096)));
$inline_count++;
next if($ignore_inline);
}
push @range, [ $_->[1], $_->[1] + $_->[2] - 1 ];
}
});
});
# poll, or the above eats up all our filedescriptors
IO::AIO::poll_cb(); # takes "max_outstanding" and "max_poll_reqs" settings
#TRACE "aio_fiemap: processed $ret : $count files (inline=$inline), " . scalar(@range) . " regions" if($loglevel >= 4);
}
IO::AIO::flush();
WARN "Failed to open $count / " . scalar(@$ret) . " files" if($count != scalar(@$ret));
DEBUG("Parsed " . scalar(@range) . " regions for $count files in " . (time - $starttime) . "s for: $vol->{PRINT}");
DEBUG("Ignored $inline \"inline\" extents for: $vol->{PRINT}") if($inline);
DEBUG("Parsed " . scalar(@range) . " regions (" . ($ignore_inline ? "ignored " : "") . "$inline_count \"inline\") for $count files in " . (time - $starttime) . "s for: $vol->{PRINT}");
return extentmap_merge(\@range);
}