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package Linux::LVM2::Utils; |
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{ |
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$Linux::LVM2::Utils::VERSION = '0.14'; |
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} |
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BEGIN { |
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1
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1760
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$Linux::LVM2::Utils::AUTHORITY = 'cpan:TEX'; |
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} |
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# ABSTRACT: Linux LVM2 helper |
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10
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1
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1
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use 5.010_000; |
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5
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1
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47
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11
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1
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1
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use mro 'c3'; |
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2
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1
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12
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1
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1
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use feature ':5.10'; |
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3
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1
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108
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14
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1
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1
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use strict; |
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2
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1
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54
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15
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1
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1
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6
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use warnings; |
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1
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1
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36
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16
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17
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# use IO::Handle; |
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# use autodie; |
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1
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1
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use Carp; |
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1
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2
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1
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97
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21
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1
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1
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8
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use File::Basename; |
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1
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1
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95
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22
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1
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1
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1206
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use POSIX qw(); |
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1
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12685
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1
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1009
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24
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# translate_devmapper_name |
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# inspired by translate_devicemapper_name from the munin diskstats plugin |
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# which was written by Michael Renner <michael.renner@amd.co.at> |
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sub translate_devmapper_name { |
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0
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0
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1
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my $device = shift; |
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30
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0
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my $want_minor; |
31
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32
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0
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0
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if($device =~ m/^dm-(\d+)$/) { |
33
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0
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$want_minor = $1; |
34
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} |
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36
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0
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0
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if(!$want_minor) { |
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0
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carp "No devicemapper id found\n"; |
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0
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return; |
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} |
40
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41
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0
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my $dm_major = find_dm_major(); |
42
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43
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0
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0
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if(!$dm_major) { |
44
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0
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carp "No devicemapper major id found\n"; |
45
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0
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return; |
46
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} |
47
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48
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0
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foreach my $dirent ( glob('/dev/mapper/*')) { |
49
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0
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my $rdev = (stat($dirent))[6]; |
50
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0
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my $major = POSIX::floor($rdev / 256 ); |
51
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0
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my $minor = $rdev % 256; |
52
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53
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0
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0
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0
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if( $major == $dm_major && $minor == $want_minor) { |
54
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0
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my $display_name = translate_lvm_name($dirent); |
55
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0
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$dirent =~ s#/dev/##; |
56
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57
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0
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0
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if(defined($display_name)) { |
58
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0
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return $display_name; |
59
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} else { |
60
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0
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return $dirent; |
61
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} |
62
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} |
63
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} |
64
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65
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# fallback in case our search was fruitless |
66
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0
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return $device; |
67
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} |
68
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69
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# translate_lvm_name |
70
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# inspired by translate_lvm_name from the munin diskstats plugin |
71
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# which was written by Michael Renner <michael.renner@amd.co.at> |
72
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sub translate_lvm_name { |
73
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0
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0
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1
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my $device = shift; |
74
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0
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0
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my $no_stat = shift || 0; |
75
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76
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0
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my $device_name = File::Basename::basename($device); |
77
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78
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# search for single dashes as this suggests for a lvm devmapper dev |
79
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0
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0
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if ( $device_name =~ m/(?<!-)-(?!-)/ ) { |
80
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# split into vg and lv parts |
81
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0
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my ( $vg, $lv ) = split /(?<!-)-(?!-)/, $device_name, 2; |
82
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83
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# remove superflous dashes from vg and lv names |
84
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0
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$vg =~ s/--/-/g; |
85
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0
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$lv =~ s/--/-/g; |
86
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87
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0
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$device_name = '/dev/'.$vg.'/'.$lv; |
88
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89
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# assert that the assembled device name actually exists |
90
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0
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0
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if($no_stat) { |
|
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0
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91
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0
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return $device_name; |
92
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} |
93
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elsif( stat($device_name)) { |
94
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0
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return $device_name; |
95
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} |
96
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} |
97
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98
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0
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return; |
99
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} |
100
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101
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# translate_mapper_name |
102
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|
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|
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sub translate_mapper_name { |
103
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0
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0
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1
|
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my $entry = shift; |
104
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0
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0
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my $no_stat = shift || 0; |
105
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106
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0
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0
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if ( $entry =~ m#^/dev/([^/]+)/(.*)$# ) { |
107
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0
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my $vg = $1; |
108
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0
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my $lv = $2; |
109
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110
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# add extraneous dashes to vg and lv names |
111
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0
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$vg =~ s/-/--/g; |
112
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0
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$lv =~ s/-/--/g; |
113
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114
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0
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my $device_name = '/dev/mapper/'.$vg.'-'.$lv; |
115
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116
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# Sanity check - does the constructed device name exist? |
117
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# Breaks unless we are root. |
118
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0
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0
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if( $no_stat) { |
|
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0
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119
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0
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return $device_name; |
120
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} |
121
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elsif ( stat($device_name) ) { |
122
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0
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|
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return $device_name; |
123
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} |
124
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} |
125
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126
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0
|
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return $entry; |
127
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} |
128
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129
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# find_devicemapper_major |
130
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# inspired by find_devicemapper_major from the munin diskstats plugin |
131
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|
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# which was written by Michael Renner <michael.renner@amd.co.at> |
132
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sub find_devicemapper_major { |
133
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0
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0
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1
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my $dm_major; |
134
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|
135
|
0
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0
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|
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if(open(my $fh, '<', '/proc/devices')) { |
136
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0
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|
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my @lines = <$fh>; |
137
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## no critic (RequireCheckedClose) |
138
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0
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close($fh); |
139
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## use critic |
140
|
0
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chomp(@lines); |
141
|
0
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|
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foreach my $line ( @lines ) { |
142
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143
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0
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my ($major, $name ) = split /\s+/, $line, 2; |
144
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145
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0
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0
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next unless defined $name; |
146
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147
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0
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0
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if ( $name eq 'device-mapper' ) { |
148
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0
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$dm_major = $major; |
149
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0
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last; |
150
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} |
151
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} |
152
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} |
153
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154
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0
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return $dm_major; |
155
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} |
156
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157
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1; |
158
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159
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__END__ |
160
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161
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=pod |
162
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163
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=encoding utf-8 |
164
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165
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|
=head1 NAME |
166
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167
|
|
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Linux::LVM2::Utils - Linux LVM2 helper |
168
|
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169
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=head1 SYNOPSIS |
170
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171
|
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|
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use Linux::LVM2::Utils |
172
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173
|
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|
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|
|
=head1 DESCRIPTION |
174
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|
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|
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|
175
|
|
|
|
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|
|
This class provides some helper methods that aid in handling of Linux LVM2 devices. |
176
|
|
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|
177
|
|
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|
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|
|
=head1 FUNCTIONS |
178
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179
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=head2 find_devicemapper_major |
180
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181
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|
Searches for the major number of the devicemapper device |
182
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183
|
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=head2 translate_devmapper_name |
184
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|
185
|
|
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|
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This method tries to find a device mapper name based on the dm minor number. |
186
|
|
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|
187
|
|
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It will return either the resolved device mapper name or the original device. |
188
|
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189
|
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|
=head2 translate_lvm_name |
190
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|
191
|
|
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|
This method tries to translate an dev-mapper device name to |
192
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|
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|
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|
|
its LVM counterpart, e.g. /dev/mapper/vg-lv -> /dev/vg/lv |
193
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194
|
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=head2 translate_mapper_name |
195
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196
|
|
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|
Translates LVM names to their ugly devicemapper names |
197
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e.g. /dev/VGfoo/LVbar -> /dev/mapper/VGfoo-LVbar |
198
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199
|
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|
|
=head1 NAME |
200
|
|
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|
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|
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|
201
|
|
|
|
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|
|
Linux::LVM2::Utils - LVM2 helper methods. |
202
|
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203
|
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|
=head1 AUTHOR |
204
|
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205
|
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|
|
Dominik Schulz <dominik.schulz@gauner.org> |
206
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207
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=head1 COPYRIGHT AND LICENSE |
208
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209
|
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This software is copyright (c) 2012 by Dominik Schulz. |
210
|
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211
|
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|
This is free software; you can redistribute it and/or modify it under |
212
|
|
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|
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|
|
the same terms as the Perl 5 programming language system itself. |
213
|
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214
|
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|
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=cut |