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btrfs-list
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#! /usr/bin/perl
# vim: et:ts=4:sw=4:sts=4:
#
# SPDX-License-Identifier: GPL-2.0-only
#
# btrfs-list: a wrapper to btrfs-progs to show a nice tree-style overview
# of your btrfs subvolumes and snapshots, a la 'zfs list'
#
# Check for the latest version at:
# https://github.com/speed47/btrfs-list
# git clone https://github.com/speed47/btrfs-list.git
# or wget https://raw.githubusercontent.com/speed47/btrfs-list/master/btrfs-list -O btrfs-list
# or curl -L https://raw.githubusercontent.com/speed47/btrfs-list/master/btrfs-list -o btrfs-list
#
# perltidy -b -csc -iscl -nolc -nbbc -pt=2 -sbt=2 -bt=2 -l=120 -msc=1 btrfs-list
#
# Stephane Lesimple
#
use strict;
use warnings;
use version;
use File::Basename;
use IPC::Open3;
use Symbol 'gensym';
use Getopt::Long qw{ :config gnu_getopt no_ignore_case };
use Data::Dumper;
use Term::ANSIColor;
my $VERSION = "2.4";
$Data::Dumper::Sortkeys = 1;
$Data::Dumper::Terse = 1;
use constant KiB => 1024**1;
use constant MiB => 1024**2;
use constant GiB => 1024**3;
use constant TiB => 1024**4;
use constant PiB => 1024**5;
use constant PARENT_UUID_DF => '*';
use constant PARENT_UUID_NONE_MAINVOL => '+';
use constant PARENT_UUID_NONE => '-';
use constant FAKE_ID_DF => -1;
use constant FAKE_ID_GHOST => -2;
sub help {
print <<"EOF";
Usage: $0 [options] [mountpoint1 [mountpoint2 [...]]]
If no mountpoints are specified, display info for all btrfs filesystems.
-h, --help display this message
--debug enable debug output
-q, --quiet silence quota disabled & quota rescan warnings,
repeat to silence all other warnings.
--version display version info
--color WHEN colorize the output; WHEN can be 'never',
'always', or 'auto' (default is:
colorize if STDOUT is a term)
-n, --no-color synonym of --color=never
--bright use bright colors (better for dark terminals)
-H, --no-header hide header from output
-r, --raw show raw numbers instead of human-readable
--btrfs-binary BIN path to the btrfs binary to use instead of using
the first binary found in the PATH
--ignore-version-check try to continue even if btrfs-progs seems too old
--ignore-root-check try to continue even if we are not root
-s, --hide-snap hide all snapshots
-S, --snap-only only show snapshots
-d, --deleted show deleted parents of orphaned snapshots
--snap-min-excl SIZE hide snapshots whose exclusively allocated extents
take up less space than SIZE
--snap-max-excl SIZE hide snapshots whose exclusively allocated extents
take up more space than SIZE
-f, --free-space only show free space on the filesystem
-u, --used display used space instead of free space
-p, --profile PROFILE override data profile detection and consider it
as 'dup', 'single', 'raid0', 'raid1',
'raid1c3', 'raid1c4', 'raid10', 'raid5' or
'raid6' for free space calculation
-a, --show-all show all information for each item
--show-gen show generation of each item
--show-cgen show generation at creation of each item
--show-id show id of each item
--show-parent show parent id of each item
--show-toplevel show top level of each item
--show-uuid show uuid of each item
--show-puuid show parent uuid of each item
--show-ruuid show received uuid of each item
--show-otime show snap creation time
-w, --wide don't truncate uuids on output (this is the
default if STDOUT is NOT a term)
--no-wide always truncate uuids on output (useful to
override above default)
--max-name-len LEN trim long subvol names to LEN. 0 means never trim.
Defaults to 80 if STDOUT is a term, 0 otherwise.
--indent LEN number of spaces to indent the tree, default: 3.
SIZE can be a number (in bytes), or a number followed by k, M, G, T or P.
EOF
exit 0;
} ## end sub help
GetOptions(
'debug' => \my $opt_debug,
'version' => \my $opt_version,
'ignore-version-check' => \my $opt_ignore_version_check,
'ignore-root-check' => \my $opt_ignore_root_check,
'q|quiet+' => \my $opt_quiet,
's|hide-snap' => \my $opt_hide_snapshots,
'S|snap-only' => \my $opt_only_snapshots,
'f|free-space' => \my $opt_free_space,
'a|show-all' => \my $opt_show_all,
'H|no-header' => \my $opt_no_header,
'show-gen' => \my $opt_show_gen,
'show-cgen' => \my $opt_show_cgen,
'show-id' => \my $opt_show_id,
'show-parent' => \my $opt_show_parent,
'show-toplevel' => \my $opt_show_toplevel,
'show-uuid' => \my $opt_show_uuid,
'show-puuid' => \my $opt_show_puuid,
'show-ruuid' => \my $opt_show_ruuid,
'show-otime' => \my $opt_show_otime,
'wide|w' => \my $opt_wide,
'no-wide' => \my $opt_no_wide,
'max-name-len=i' => \my $opt_max_name_len,
'indent=i' => \my $opt_indent,
'snap-min-used|snap-min-excl=s' => \my $opt_snap_min_used,
'snap-max-used|snap-max-excl=s' => \my $opt_snap_max_used,
'n|no-color' => \my $opt_no_color,
'color=s' => \my $opt_color,
'bright' => \my $opt_bright,
'h|help|usage' => \my $opt_help,
'p|profile=s' => \my $opt_profile,
'r|raw' => \my $opt_raw,
'btrfs-binary=s' => \my $opt_btrfs_binary,
'd|deleted' => \my $opt_deleted,
'u|used' => \my $opt_used,
) or die "FATAL: Error parsing arguments, aborting\n";
$opt_quiet ||= 0;
sub debug {
return if !$opt_debug;
print STDERR $_ . "\n" for @_;
return;
}
sub warning {
my ($level, @lines) = @_;
return if ($level <= $opt_quiet);
print STDERR "WARNING: $_\n" for @lines;
return;
} ## end sub warning
sub run_cmd {
my %params = @_;
my $cmd = $params{'cmd'};
my $silent_stderr = $params{'silent_stderr'};
my $fatal = $params{'fatal'};
if ($cmd->[0] eq 'btrfs' && $opt_btrfs_binary) {
$cmd->[0] = $opt_btrfs_binary;
}
my ($_stdin, $_stdout, $_stderr);
$_stderr = gensym;
debug("about to run_cmd ['" . join("','", @$cmd) . "']");
my $pid = eval { open3($_stdin, $_stdout, $_stderr, @$cmd); };
if ($@) {
if ($fatal) {
print STDERR "FATAL: failed to run [" . join(' ', @$cmd) . "] ($@)\n";
exit 1;
}
return {status => -1, stdout => [], stderr => []};
} ## end if ($@)
debug("waiting for cmd to complete...");
my @stdout = ();
my @stderr = ();
while (<$_stdout>) {
chomp;
debug("stdout: " . $_);
/WARNING: (.+)/ and warning(2, "btrfs-progs: $1");
push @stdout, $_;
} ## end while (<$_stdout>)
while (<$_stderr>) {
chomp;
debug("stderr: " . $_);
/WARNING: (RAID56 detected, not implemented)/ and warning(2, "btrfs-progs: $1");
if (!$silent_stderr) {
print join(' ', @$cmd) . ": stderr: " . $_ . "\n";
}
push @stderr, $_;
} ## end while (<$_stderr>)
waitpid($pid, 0);
my $child_exit_status = $? >> 8;
debug("cmd return status is $child_exit_status");
if ($fatal && $child_exit_status != 0) {
print STDERR "FATAL: the command [" . join(' ', @$cmd) . "] returned a non-zero status ($child_exit_status)\n";
print STDERR "FATAL: stdout: " . $_ . "\n" for @stdout;
print STDERR "FATAL: stderr: " . $_ . "\n" for @stderr;
exit 1;
} ## end if ($fatal && $child_exit_status...)
return {status => $child_exit_status, stdout => \@stdout, stderr => \@stderr};
} ## end sub run_cmd
sub link2real {
my $dev = shift;
CORE::state %readlinkcache;
if (defined $readlinkcache{$dev}) {
return $readlinkcache{$dev};
}
my $cmd = run_cmd(fatal => 1, cmd => [qw{ readlink -f }, $dev]);
if (defined $cmd->{stdout}->[0]) {
$readlinkcache{$dev} = $cmd->{stdout}->[0];
return $readlinkcache{$dev};
}
return $dev;
} ## end sub link2real
# returns a list with 5 items
# item1: color-code before the number
# item2: the string
# item3: color-code after the number and before the multiplier
# item4: the multiplier (1 char)
# item5: color-code after the multiplier
sub pretty_print {
my ($raw, $mode) = @_;
=comment
debug("pretty_print(@_);");
my @c = caller(0);
debug(Dumper(\@c));
=cut
if ($opt_raw) {
return ('', $raw, '', '', '') if (!$mode || $raw ne 0);
return ('', '-', '', '', '');
}
elsif ($mode && ($raw eq '-' || $raw == 0)) {
return ('', '-', '', '', '') if $mode == 1;
return ('', '0', '', '', '') if $mode == 2;
}
my $bright = ($opt_bright ? 'bright_' : '');
CORE::state($nbcolors, $dark);
if (!defined $nbcolors) {
# try to use tput if we happen to have it
my $cmd = run_cmd(cmd => [qw{ tput colors }], silent_stderr => 1);
if ($cmd->{'status'} == -1 || !@{$cmd->{stdout}}) {
# we don't have tput, get info from env instead
if ($ENV{'TERM'}) {
if ($ENV{'TERM'} =~ /256/) {
$nbcolors = 256;
}
elsif ($ENV{'TERM'} =~ /dumb/) {
$nbcolors = -1;
}
else {
$nbcolors = 8;
}
} ## end if ($ENV{'TERM'})
else {
$nbcolors = -1;
}
} ## end if ($cmd->{'status'} ==...)
else {
$nbcolors = $cmd->{stdout}->[0];
chomp $nbcolors;
}
$nbcolors = 8 if !$nbcolors;
debug("nbcolors=$nbcolors");
$dark = ($nbcolors <= 8 ? "${bright}black" : 'grey9');
# terms that don't support colors (except if --color=always)
$ENV{'ANSI_COLORS_DISABLED'} = 1 if ($nbcolors == -1 && $opt_color ne 'always');
} ## end if (!defined $nbcolors)
my $r = color('reset');
if ($raw > PiB) { return (color("${bright}magenta"), sprintf('%.2f', $raw / PiB), color($dark), 'P', $r); }
elsif ($raw > TiB) { return (color("${bright}red"), sprintf('%.2f', $raw / TiB), color($dark), 'T', $r); }
elsif ($raw > GiB) { return (color("${bright}yellow"), sprintf('%.2f', $raw / GiB), color($dark), 'G', $r); }
elsif ($raw > MiB) { return (color("${bright}green"), sprintf('%.2f', $raw / MiB), color($dark), 'M', $r); }
elsif ($raw > KiB) { return (color("${bright}blue"), sprintf('%.2f', $raw / KiB), color($dark), 'k', $r); }
else { return ('', sprintf('%.2f', $raw), '', ' ', ''); }
} ## end sub pretty_print
sub pretty_print_str {
return sprintf("%s%s%s%s%s", pretty_print(@_));
}
sub human2raw {
my $human = shift;
return $human if ($human !~ /^((\d+)(\.\d+)?)([kMGTP])/);
if ($4 eq 'P') { return $1 * PiB; }
elsif ($4 eq 'T') { return $1 * TiB; }
elsif ($4 eq 'G') { return $1 * GiB; }
elsif ($4 eq 'M') { return $1 * MiB; }
elsif ($4 eq 'k') { return $1 * KiB; }
return $human;
} ## end sub human2raw
sub compute_allocatable_for_profile {
my ($profile, $free, $devBytesRef) = @_;
my $unallocFree = 0;
my $sliceSize = TiB;
my %devBytes = %$devBytesRef;
while (1) {
# reduce sliceSize if needed, note that btrfs never allocates chunks
# smaller than 1 MiB
if ($sliceSize > MiB && grep { $_ < 3 * $sliceSize } values %devBytes) {
$sliceSize /= 2;
next;
}
# sort device by remaining free space.
# $sk[0] has the most available space, then $sk[1], etc.
my @sk = sort { $devBytes{$b} <=> $devBytes{$a} } keys %devBytes;
if ($profile eq 'raid1') {
last if ($devBytes{$sk[1]} <= $sliceSize); # out of space
$unallocFree += $sliceSize;
$devBytes{$sk[0]} -= $sliceSize;
$devBytes{$sk[1]} -= $sliceSize;
} ## end if ($profile eq 'raid1')
elsif ($profile eq 'raid1c3') {
last if ($devBytes{$sk[2]} <= $sliceSize); # out of space
$unallocFree += $sliceSize;
$devBytes{$sk[0]} -= $sliceSize;
$devBytes{$sk[1]} -= $sliceSize;
$devBytes{$sk[2]} -= $sliceSize;
} ## end elsif ($profile eq 'raid1c3')
elsif ($profile eq 'raid1c4') {
last if ($devBytes{$sk[3]} <= $sliceSize); # out of space
$unallocFree += $sliceSize;
$devBytes{$sk[0]} -= $sliceSize;
$devBytes{$sk[1]} -= $sliceSize;
$devBytes{$sk[2]} -= $sliceSize;
$devBytes{$sk[3]} -= $sliceSize;
} ## end elsif ($profile eq 'raid1c4')
elsif ($profile eq 'raid10') {
last if ($devBytes{$sk[3]} <= $sliceSize); # out of space
$unallocFree += $sliceSize * 2;
$devBytes{$sk[0]} -= $sliceSize;
$devBytes{$sk[1]} -= $sliceSize;
$devBytes{$sk[2]} -= $sliceSize;
$devBytes{$sk[3]} -= $sliceSize;
} ## end elsif ($profile eq 'raid10')
elsif ($profile eq 'raid5' || $profile eq 'raid6') {
my $parity = ($profile eq 'raid5' ? 1 : 2);
my $nb = grep { $_ > $sliceSize } values %devBytes;
last if $nb < $parity + 1; # out of space
foreach my $dev (keys %devBytes) {
$devBytes{$dev} -= $sliceSize if $devBytes{$dev} > $sliceSize;
}
$unallocFree += ($nb - $parity) * $sliceSize;
} ## end elsif ($profile eq 'raid5'...)
elsif (grep { $profile eq $_ } qw( raid0 single dup )) {
# those are easy, we just add up every free space of every device
# and call it a day (no need to loop through the allocator)
$unallocFree += $_ for values %devBytes;
$unallocFree /= 2 if $profile eq 'dup';
%devBytes = ();
last;
} ## end elsif (grep { $profile eq...})
else {
print "ERROR: Unknown data profile '$profile'!\n";
exit 1;
}
} ## end while (1)
$free += $unallocFree;
# if free is < 1 MiB, then consider it as full to the brim,
# because when FS is completely full, it always shows a couple
# kB left (depending on the profile), even if not a single more
# byte can be written.
$free = 0 if $free < MiB;
# remaining space on each device is unallocatable, don't count space
# below the MiB for a given device for the same reason as above
my $unallocatable = 0;
foreach (values %devBytes) {
$unallocatable += ($_ - MiB) if $_ > MiB;
}
return {allocatable => $free, unallocatable => $unallocatable};
} ## end sub compute_allocatable_for_profile
# MAIN
if ($opt_version) {
# if we were git clone'd, adjust VERSION
my $ver = $VERSION;
my $dir = dirname($0);
if (-d "$dir/.git") {
my $cmd = run_cmd(silent_stderr => 1, cmd => [qw{ git -C }, $dir, qw{ describe --tags --dirty }]);
if ($cmd->{status} == 0 && $cmd->{stdout}) {
$ver = $cmd->{stdout}[0];
$ver =~ s/^v//;
}
} ## end if (-d "$dir/.git")
# also get btrfs --version
my $btrfsver;
my $cmd = run_cmd(cmd => [qw{ btrfs --version }]);
if ($cmd->{status} == 0) {
($btrfsver) = $cmd->{stdout}->[0] =~ /v([0-9.]+)/;
}
print "btrfs-list v$ver using btrfs v$btrfsver\n";
exit 0;
} ## end if ($opt_version)
# check opts
$opt_color = 'never' if $opt_no_color;
$opt_color //= 'auto';
if (defined $opt_snap_min_used) {
$opt_snap_min_used = human2raw($opt_snap_min_used);
}
if (defined $opt_snap_max_used) {
$opt_snap_max_used = human2raw($opt_snap_max_used);
}
if ($opt_color eq 'never' || ($opt_color eq 'auto' && !-t 1)) { ## no critic(InputOutput::ProhibitInteractiveTest)
$ENV{'ANSI_COLORS_DISABLED'} = 1;
}
if (!$opt_wide && !-t 1) { ## no critic(InputOutput::ProhibitInteractiveTest)
# wide if STDOUT is NOT a term
$opt_wide = 1;
}
if (defined $opt_no_wide) {
# --no-wide always wins
$opt_wide = 0;
}
if (!defined $opt_max_name_len) {
# if STDOUT is a term, set to 80, otherwise 0 (no limit)
$opt_max_name_len = (-t 1 ? 80 : 0); ## no critic(InputOutput::ProhibitInteractiveTest)
}
if ($opt_max_name_len > 0 && $opt_max_name_len < 4) {
$opt_max_name_len = 4;
}
$opt_indent //= 3;
if (defined $opt_profile && $opt_profile !~ /^(raid([0156]|1c[34]|10)|single|dup)$/) {
print STDERR "FATAL: invalid argument for --profile\n";
help();
exit 1;
}
if ($opt_show_all) {
$opt_show_gen = 1;
$opt_show_cgen = 1;
$opt_show_id = 1;
$opt_show_parent = 1;
$opt_show_toplevel = 1;
$opt_show_uuid = 1;
$opt_show_puuid = 1;
$opt_show_ruuid = 1;
$opt_show_otime = 1;
} ## end if ($opt_show_all)
if ($opt_btrfs_binary && !-f -x $opt_btrfs_binary) {
print STDERR "FATAL: Specified btrfs binary '$opt_btrfs_binary' doesn't exist or is not executable\n";
exit 1;
}
help() if $opt_help;
# check btrfs-progs version
my $cmd = run_cmd(fatal => 1, cmd => [qw{ btrfs --version }]);
my ($version_verbatim, $version) = $cmd->{stdout}->[0] =~ /v((\d+\.\d+)\S*)/;
if (version->declare($version)->numify lt version->declare("3.18")->numify && !$opt_ignore_version_check) {
print STDERR "FATAL: you're using an old version of btrfs-progs, v$version, "
. "we need at least version 3.18 (Dec 2014).\n";
print STDERR "If you think this is in error, use --ignore-version-check.\n";
exit 1;
} ## end if (version->declare($version...))
if ($version_verbatim eq '6.1' && !$opt_ignore_version_check) {
warning(2,
"the btrfs-progs version you're using, " . "v$version_verbatim, is known to be missing subvolume uuids.");
}
elsif ($version_verbatim eq '5.15' && !$opt_ignore_version_check) {
warning(2,
"the btrfs-progs version you're using, " . "v$version_verbatim, is known to report free fs space incorrectly.");
}
if ($< != 0 && !$opt_ignore_root_check) {
print STDERR "FATAL: you must be root to use this command\n";
print STDERR "If you think this is in error, use --ignore-root-check\n";
exit 1;
}
# get moutpoint list, we'll need it several times in the script
my @procmounts;
my %mphash;
open(my $procfd, '<', '/proc/mounts') or die("Couldn't open /proc/mounts: $!");
while (<$procfd>) {
if (m{^(\S+)\s+(\S+)\s+(\S+)\s+(\S+)}) {
push @procmounts,
{
dev => $1,
mp => $2,
fstype => $3,
options => $4,
};
$mphash{$2} = 1;
} ## end if (m{^(\S+)\s+(\S+)\s+(\S+)\s+(\S+)})
} ## end while (<$procfd>)
close($procfd);
# get passed mountpoints
my @mountPoints = @ARGV;
# ensure these (if any) are mountpoints
foreach my $mp (@mountPoints) {
# canonicalize
$mp = link2real($mp);
# if not a mp, find a parent that is
while (1) {
$mp ||= '/';
my $ismp = 0;
foreach (@procmounts) {
next if ($_->{mp} ne $mp);
$ismp = 1;
last;
}
if (!$ismp) {
next if ($mp =~ s{/[^/]+$}{});
last;
}
last;
} ## end while (1)
debug("done, mp is: $mp");
} ## end foreach my $mp (@mountPoints)
# get filesystems list
=comment
# btrfs filesystem show
Label: 'beurre' uuid: 010705d8-430f-4f5b-9315-12df40677e97
Total devices 4 FS bytes used 18.23MiB
devid 1 size 250.00MiB used 176.00MiB path /dev/loop1
devid 2 size 250.00MiB used 164.00MiB path /dev/loop2
devid 3 size 250.00MiB used 164.00MiB path /dev/loop3
devid 4 size 250.00MiB used 164.00MiB path /dev/loop4
=cut
# if no mountpoints specified, use undef to run a 'btrfs fi show' once with no params (all fs)
@mountPoints = (undef) if !@mountPoints;
my @fishow = ();
foreach my $mp (@mountPoints) {
$cmd = run_cmd(silent_stderr => 1, cmd => [qw{ btrfs filesystem show --raw }, defined $mp ? $mp : ()]);
if (!@{$cmd->{stdout}} || $cmd->{status}) {
$cmd = run_cmd(fatal => 1, cmd => [qw{ btrfs filesystem show }, defined $mp ? $mp : ()]);
}
push @fishow, @{$cmd->{stdout}} if $cmd->{stdout};
} ## end foreach my $mp (@mountPoints)
my ($label, $fuuid, %filesystems);
foreach (@fishow) {
if (/^Label:\s+(\S+)\s+uuid:\s+([0-9a-f-]+)/) {
$label = $1;
$fuuid = $2;
# btrfs-progs v3.14+ enquote the label
if ($label =~ /^'(.+)'$/) {
$label = $1;
}
if ($label eq 'none') {
# use the beggining of the uuid instead
$label = substr($2, 0, 8);
}
} ## end if (/^Label:\s+(\S+)\s+uuid:\s+([0-9a-f-]+)/)
if (defined $fuuid and m{devid\s+(\d+)\s+size\s+(\S+).+path\s+(\S+)}) {
my ($devid, $size, $dev) = ($1, human2raw($2), $3);
if (not exists $filesystems{$fuuid}) {
$filesystems{$fuuid} = {uuid => $fuuid, label => $label, devices => [], devinfo => {}};
}
# btrfs-progs v5.10.1 bug workaround: "dm-X" instead of "/dev/dm-X"
if ($dev && $dev =~ m{^dm-}) {
debug("Applying workaround $dev => /dev/$dev");
$dev = "/dev/$dev";
}
if (-l $dev) {
$dev = link2real($dev);
}
push @{$filesystems{$fuuid}{'devices'}}, $dev;
$filesystems{$fuuid}{'devinfo'}{$dev} = {
devid => $devid,
size => $size
};
} ## end if (defined $fuuid and...)
} ## end foreach (@fishow)
debug("FILESYSTEMS HASH DUMP 1:", Dumper \%filesystems);
if (!%filesystems) {
print "No btrfs filesystem found.\n";
exit 0;
}
# now look for the mountpoints
my %dev2mp;
my %volid2mp;
foreach my $line (@procmounts) {
# fix for /dev/mapper/stuff being a sylink to ../dm-xxx
next if $line->{fstype} ne 'btrfs';
my $subvolid = 0;
($subvolid) = $line->{options} =~ /subvolid=(\d+)/;
debug(">> mounts item [$line->{dev}] subvolid[$subvolid] mounted on $line->{mp}");
# ||=: we might have bind mounts and such, just take the first occurence
if ($line->{options} =~ /subvolid=(\d+)/) {
$dev2mp{$line->{dev}} ||= $line->{mp};
$volid2mp{$line->{dev}}{$subvolid} ||= $line->{mp};
}
if (-l $line->{dev}) {
my $real = link2real($line->{dev});
$dev2mp{$real} ||= $line->{mp};
$volid2mp{$real}{$subvolid} ||= $line->{mp};
}
} ## end foreach my $line (@procmounts)
foreach my $fuuid (keys %filesystems) {
foreach my $dev (@{$filesystems{$fuuid}{'devices'} || []}) {
if (exists $dev2mp{$dev}) {
$filesystems{$fuuid}{'mountpoint'} = $dev2mp{$dev};
$filesystems{$fuuid}{'volmp'} = $volid2mp{$dev};
last;
}
} ## end foreach my $dev (@{$filesystems...})
} ## end foreach my $fuuid (keys %filesystems)
debug("FILESYSTEMS HASH DUMP 2:", Dumper \%filesystems);
# now, for each filesystem we found, let's dig:
my %vol;
foreach my $fuuid (keys %filesystems) {
my $mp = $filesystems{$fuuid}{'mountpoint'};
defined $mp or next;
-d $mp or next;
$cmd = run_cmd(silent_stderr => 1, cmd => [qw{ btrfs filesystem usage --raw }, $mp]);
if (!@{$cmd->{stdout}} || $cmd->{status}) {
$cmd = run_cmd(fatal => 1, cmd => [qw{ btrfs filesystem usage }, $mp]);
}
my ($seenUnallocated, %devFree, $profile, $mprofile);
my ($total, $fssize, $used, $freeEstimated) = (0, 0, 0, 0);
foreach (@{$cmd->{stdout}}) {
if (/Device\s+size:\s*(\S+)/) {
$fssize = human2raw($1);
}
elsif (/^Data,([^:]+): Size:([^,]+), Used:(\S+)/) {
#v3.18: Data,RAID1: Size:9.90TiB, Used:9.61TiB
#v3.19+: Data,RAID1: Size:10881302659072, Used:10569277333504
$profile = lc($1);
$total += human2raw($2);
$used += human2raw($3);
} ## end elsif (/^Data,([^:]+): Size:([^,]+), Used:(\S+)/)
elsif (/^Metadata,([^:]+): Size:([^,]+), Used:(\S+)/) {
$mprofile = lc($1);
}
elsif (/Free\s*\(estimated\)\s*:\s*(\S+)/) {
#Free (estimated): 405441961984 (min: 405441961984)
#Free (estimated): 377.60GiB (min: 377.60GiB)
$freeEstimated = human2raw($1);
} ## end elsif (/Free\s*\(estimated\)\s*:\s*(\S+)/)
if (m{^Unallocated:}) {
$seenUnallocated = 1;
}
elsif ($seenUnallocated && m{^\s*(/\S+)\s+(\d+)\s*$}) {
$devFree{$1} = human2raw($2) + 0;
}
} ## end foreach (@{$cmd->{stdout}})
$vol{$fuuid}{df} = {
id => FAKE_ID_DF,
path => $filesystems{$fuuid}{label},
gen => 0,
cgen => 0,
parent => '-',
top => '-', # top_level
uuid => $fuuid,
puuid => PARENT_UUID_DF, # parent_uuid
ruuid => '-', # received_uuid
type => 'fs',
mode => 'rw',
rfer => '-',
excl => $used,
free => $total - $used,
fssize => $fssize,
};
debug( "df for $fuuid ("
. $filesystems{$fuuid}{label}
. "), excl=$used, free="
. ($total - $used)
. ", fssize=$fssize");
# cmdline override
$profile = $opt_profile if defined $opt_profile;
if (!$profile) {
warning(2, "No profile found, assuming single");
$profile = "single";
}
$vol{$fuuid}{df}{profile} = $profile;
$vol{$fuuid}{df}{mprofile} = $mprofile;
my $computed = compute_allocatable_for_profile($profile, $vol{$fuuid}{df}{free}, \%devFree);
$vol{$fuuid}{df}{free} = $computed->{allocatable};
$vol{$fuuid}{df}{unallocatable} = $computed->{unallocatable};
# also compute total allocatable size if FS fs empty
my %devSize;
foreach my $dev (@{$filesystems{$fuuid}{devices}}) {
$devSize{$dev} = $filesystems{$fuuid}{devinfo}{$dev}{size};
}
$computed = compute_allocatable_for_profile($profile, 0, \%devSize);
$vol{$fuuid}{df}{fssize} = $computed->{allocatable};
next if $opt_free_space;
# cvol btrfs sub list
$cmd = run_cmd(silent_stderr => 1, cmd => [qw{ btrfs subvolume list -pacguq }, $mp]);
# ID 3332 gen 81668 cgen 2039 parent 0 top level 0 parent_uuid 9faf..17d4 uuid 20b7..5b61 path <FS_TREE>/DELETED
# ID 1911 gen 81668 cgen 929 parent 5 top level 5 parent_uuid - uuid aec0705e-6cae-a941-854c-d95e0a36ba2c path main
foreach (@{$cmd->{stdout}}) {
my $vuuid = undef;
if (/(\s|^)uuid ([0-9a-f-]+)/) {
$vuuid = $2;
if ($vuuid eq '-') {
# old btrfs kernel, recent btrfsprogs
m{ID (\d+)} and $vuuid = $1;
}
$vol{$fuuid}{$vuuid}{uuid} = $vuuid;
} ## end if (/(\s|^)uuid ([0-9a-f-]+)/)
elsif (/(\s|^)ID (\d+)/) {
# old btrfsprogs
$vuuid = $2;
$vol{$fuuid}{$vuuid}{uuid} = $vuuid;
} ## end elsif (/(\s|^)ID (\d+)/)
else {
next;
}
# ID 257 gen 17 cgen 11 parent 5 top level 5 parent_uuid - received_uuid - uuid 9bc4..fd75 path sub1 with spaces
$vol{$fuuid}{$vuuid}{puuid} = PARENT_UUID_NONE; # old btrfsprogs don't have puuid, set a sane default
/(\s|^)ID (\d+)/ and $vol{$fuuid}{$vuuid}{id} = $2;
/(\s|^)gen (\d+)/ and $vol{$fuuid}{$vuuid}{gen} = $2;
/(\s|^)cgen (\d+)/ and $vol{$fuuid}{$vuuid}{cgen} = $2;
/(\s|^)parent (\d+)/ and $vol{$fuuid}{$vuuid}{parent} = $2;
/(\s|^)top level (\d+)/ and $vol{$fuuid}{$vuuid}{top} = $2;
/(\s|^)parent_uuid (\S+)/ and $vol{$fuuid}{$vuuid}{puuid} = $2;
/(\s|^)received_uuid (\S+)/ and $vol{$fuuid}{$vuuid}{ruuid} = $2;
/(\s|^)path (.+)/ and $vol{$fuuid}{$vuuid}{path} = $2;
$vol{$fuuid}{$vuuid}{path} =~ s/^<FS_TREE>\///;
$vol{$fuuid}{$vuuid}{type} = 'subvol'; # by default, will be overriden below if applicable
$vol{$fuuid}{$vuuid}{mode} = 'rw'; # by default, will be overriden below if applicable
$vol{$fuuid}{$vuuid}{rfer} = 0;
$vol{$fuuid}{$vuuid}{excl} = 0;
$vol{$fuuid}{$vuuid}{mp} = $filesystems{$fuuid}{volmp}{$vol{$fuuid}{$vuuid}{id}};
} ## end foreach (@{$cmd->{stdout}})
# now, list only snapshots, we also get their otime for free
$cmd = run_cmd(cmd => [qw{ btrfs subvolume list -us }, $mp]);
# ID 694 gen 30002591 cgen 30002589 top level 5 otime 2022-01-02 14:37:14 path test backup2 with spaces
foreach (@{$cmd->{stdout}}) {
my ($found, $otime);
/(\s|^)uuid ([0-9a-f-]+)/ and exists $vol{$fuuid}{$2} and $found = $2;
/(\s|^)ID ([0-9]+)/ and exists $vol{$fuuid}{$2} and $found = $2;
/(\s|^)otime (\S+ \S+)/ and $otime = $2;
if (defined $found) {
if ($opt_hide_snapshots) {
delete $vol{$fuuid}{$found};
}
else {
$vol{$fuuid}{$found}{type} = 'snap';
$vol{$fuuid}{$found}{otime} = $otime if $otime;
}
} ## end if (defined $found)
} ## end foreach (@{$cmd->{stdout}})
# then, list readonly snapshots
$cmd = run_cmd(cmd => [qw{ btrfs subvolume list -ur }, $mp]);
foreach (@{$cmd->{stdout}}) {
/(\s|^)uuid ([0-9a-f-]+)/ and exists $vol{$fuuid}{$2} and $vol{$fuuid}{$2}{mode} = 'ro';
/(\s|^)ID ([0-9]+)/ and exists $vol{$fuuid}{$2} and $vol{$fuuid}{$2}{mode} = 'ro';
}
debug("VOL{FUUID=$fuuid} DUMP:", Dumper \$vol{$fuuid});
} ## end foreach my $fuuid (keys %filesystems)
# get quota stuff
# v3.18 (no --raw)
=comment
WARNING: Qgroup data inconsistent, rescan recommended
qgroupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/5 7.99MiB 7.99MiB 0.00B 0.00B --- ---
0/257 10.02MiB 10.01MiB 0.00B 0.00B --- ---
=cut
# v3.19+ has --raw, and additionally, since v4.1, we get 'none' instead of 0:
=comment
qgroupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/5 9848498 8015121 none none --- ---
0/257 10213513 10131212 none none --- ---
=cut
foreach my $fuuid (keys %filesystems) {
my $mp = $filesystems{$fuuid}{'mountpoint'};
defined $mp or next;
-d $mp or next;
next if $opt_free_space;
# let's still fill the info for the main volume
$vol{$fuuid}{5} = {
id => 5,
path => "[main]",
gen => 0,
cgen => 0,
parent => '-',
top => '-',
uuid => '-', # may be filled below
puuid => PARENT_UUID_NONE_MAINVOL,
ruuid => '-',
type => 'mainvol',
mode => 'rw',
mp => $mp,
};
# grab the uuid of the main volume, note that sometimes there is none, and UUID is reported as '-'
# also get the current geenration, and the gen at creation (which should always be 0)
$cmd = run_cmd(silent_stderr => 1, cmd => [qw{ btrfs subvolume show -b }, $mp]);
foreach (@{$cmd->{stdout}}) {
/^\s*UUID:\s*([0-9a-f-]+)/ and $vol{$fuuid}{5}{uuid} = $1;
/Generation:\s*(\d+)/ and $vol{$fuuid}{5}{gen} = $1;
/Gen at creation:\s*(\d+)/ and $vol{$fuuid}{5}{cgen} = $1;
}
$cmd = run_cmd(silent_stderr => 1, cmd => [qw{ btrfs quota rescan -s }, $mp]);
if ($cmd->{stdout}->[0] && $cmd->{stdout}->[0] =~ /operation running|current key/) {
warning(1, "a quota rescan is running, size information is not correct yet");
}
$cmd = run_cmd(silent_stderr => 1, cmd => [qw{ btrfs qgroup show -pcre --raw }, $mp]);
if ($cmd->{status} || !@{$cmd->{stdout}}) {
# btrfs-progs v3.18 doesn't support --raw
$cmd = run_cmd(silent_stderr => 1, cmd => [qw{ btrfs qgroup show -pcre }, $mp]);
if ($cmd->{status} || !@{$cmd->{stdout}}) {
warning(1, "to get refer/excl size information, please enable qgroups (btrfs quota enable $mp)");
$vol{$fuuid}{df}{noquota} = 1;
}
} ## end if ($cmd->{status} || ...)
foreach (@{$cmd->{stdout}}) {
if (m{^(\d+)/(\d+)\s+(\S+)\s+(\S+)}) {
my ($qid, $id, $rfer, $excl) = ($1, $2, human2raw($3), human2raw($4));
next if $qid != 0; # only check level 0 qgroups (leafs)
if ($id < 256) {
if (not exists $vol{$fuuid}{$id}) {
$vol{$fuuid}{$id} = {
id => $id,
path => "[main]",
gen => 0,
cgen => 0,
parent => '-',
top => '-',
puuid => PARENT_UUID_NONE_MAINVOL,
ruuid => '-',
type => 'mainvol',
mode => 'rw',
mp => $filesystems{$fuuid}{volmp}{5},
};
} ## end if (not exists $vol{$fuuid...})
$vol{$fuuid}{$id}{rfer} = $rfer;
$vol{$fuuid}{$id}{excl} = $excl;
next;
} ## end if ($id < 256)
foreach my $vuuid (keys %{$vol{$fuuid}}) {
if ($id eq $vol{$fuuid}{$vuuid}{id}) {
$vol{$fuuid}{$vuuid}{rfer} = $rfer;
$vol{$fuuid}{$vuuid}{excl} = $excl;
last;
}
} ## end foreach my $vuuid (keys %{$vol...})
} ## end if (m{^(\d+)/(\d+)\s+(\S+)\s+(\S+)})
} ## end foreach (@{$cmd->{stdout}})
} ## end foreach my $fuuid (keys %filesystems)
debug("VOL HASH DUMP (filesystem uuid - volume uuid - data):", Dumper \%vol);
# ok, now, do the magic
my @ordered = ();
my $maxdepth = 0;
my %seen;
sub recursive_add_children_of {
my %params = @_;
my $volumes = $params{'volumes'};
my $depth = $params{'depth'};
my $parentuuid = $params{'parentuuid'};
$depth > $maxdepth and $maxdepth = $depth;
foreach my $vuuid (sort { $volumes->{$a}{id} <=> $volumes->{$b}{id} } keys %$volumes) {
next if $seen{$vuuid}; # not needed, but just in case
my $vol = $volumes->{$vuuid};
debug( "..." x ($depth)
. "parent_uuid=$parentuuid, currently working on id "
. $vol->{id}
. " volume_uuid=$vuuid having parent_uuid="
. $vol->{puuid}
. " and path-type "
. $vol->{path} . "-"
. $vol->{type});
if ($parentuuid eq $vol->{puuid}) {
$vol->{depth} = $depth;
push @ordered, $vol;
debug("..." x ($depth) . "^^^");
$seen{$vuuid} = 1;
recursive_add_children_of(volumes => $volumes, depth => $depth + 1, parentuuid => $vuuid); # unless $parentuuid eq '-';
} ## end if ($parentuuid eq $vol...)
} ## end foreach my $vuuid (sort { $volumes...})
return;
} ## end sub recursive_add_children_of
my @orderedAll;
$opt_deleted ||= 0;
foreach my $fuuid (sort keys %filesystems) {
@ordered = ();
%seen = ();
$maxdepth = 0;
my @orphans = ();
# first, we want the so-called "df" line, which conveniently has a fake specific parent_uuid
debug(">>> order df");
recursive_add_children_of(volumes => $vol{$fuuid}, depth => 0, parentuuid => PARENT_UUID_DF);
# then, the builtin main volume (id=5) and all its descendants
debug(">>> order mainvol");
recursive_add_children_of(volumes => $vol{$fuuid}, depth => 1, parentuuid => PARENT_UUID_NONE_MAINVOL);
# then, all the other top-level volumes (i.e. that have no parent uuid)
debug(">>> order top level vols");
recursive_add_children_of(volumes => $vol{$fuuid}, depth => 1, parentuuid => PARENT_UUID_NONE);
next if !@ordered;
# then, we might still have unseen volumes, which are orphans (they have a parent_uuid)
# but the parent_uuid no longer exists). get all those in a hash
ORPHANS: foreach my $vuuid (keys %{$vol{$fuuid}}) {
next if $seen{$vuuid};
push @orphans, $vuuid;
}
# those orphans might however have parents/children between themselves,
# so find the first one that has no known parent among the other orphans
foreach my $orphan (sort @orphans) {
my $no_known_parent = 1;
foreach my $potential_parent (@orphans) {
next if $orphan eq $potential_parent; # skip myself
$no_known_parent = 0 if ($potential_parent eq $vol{$fuuid}{$orphan}{puuid});
}
debug(">>> orphan loop on $orphan, no known parent: $no_known_parent");