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1package PVE::Storage::LVMPlugin;
2
3use strict;
4use warnings;
5use IO::File;
6use PVE::Tools qw(run_command trim);
7use PVE::Storage::Plugin;
8use PVE::JSONSchema qw(get_standard_option);
9
10use base qw(PVE::Storage::Plugin);
11
12# lvm helper functions
13
14sub lvm_pv_info {
15 my ($device) = @_;
16
17 die "no device specified" if !$device;
18
19 my $has_label = 0;
20
21 my $cmd = ['/usr/bin/file', '-L', '-s', $device];
22 run_command($cmd, outfunc => sub {
23 my $line = shift;
24 $has_label = 1 if $line =~ m/LVM2/;
25 });
26
27 return undef if !$has_label;
28
29 $cmd = ['/sbin/pvs', '--separator', ':', '--noheadings', '--units', 'k',
30 '--unbuffered', '--nosuffix', '--options',
31 'pv_name,pv_size,vg_name,pv_uuid', $device];
32
33 my $pvinfo;
34 run_command($cmd, outfunc => sub {
35 my $line = shift;
36
37 $line = trim($line);
38
39 my ($pvname, $size, $vgname, $uuid) = split(':', $line);
40
41 die "found multiple pvs entries for device '$device'\n"
42 if $pvinfo;
43
44 $pvinfo = {
45 pvname => $pvname,
46 size => $size,
47 vgname => $vgname,
48 uuid => $uuid,
49 };
50 });
51
52 return $pvinfo;
53}
54
55sub clear_first_sector {
56 my ($dev) = shift;
57
58 if (my $fh = IO::File->new($dev, "w")) {
59 my $buf = 0 x 512;
60 syswrite $fh, $buf;
61 $fh->close();
62 }
63}
64
65sub lvm_create_volume_group {
66 my ($device, $vgname, $shared) = @_;
67
68 my $res = lvm_pv_info($device);
69
70 if ($res->{vgname}) {
71 return if $res->{vgname} eq $vgname; # already created
72 die "device '$device' is already used by volume group '$res->{vgname}'\n";
73 }
74
75 clear_first_sector($device); # else pvcreate fails
76
77 # we use --metadatasize 250k, which reseults in "pe_start = 512"
78 # so pe_start is aligned on a 128k boundary (advantage for SSDs)
79 my $cmd = ['/sbin/pvcreate', '--metadatasize', '250k', $device];
80
81 run_command($cmd, errmsg => "pvcreate '$device' error");
82
83 $cmd = ['/sbin/vgcreate', $vgname, $device];
84 # push @$cmd, '-c', 'y' if $shared; # we do not use this yet
85
86 run_command($cmd, errmsg => "vgcreate $vgname $device error");
87}
88
89sub lvm_vgs {
90
91 my $cmd = ['/sbin/vgs', '--separator', ':', '--noheadings', '--units', 'b',
92 '--unbuffered', '--nosuffix', '--options',
93 'vg_name,vg_size,vg_free'];
94
95 my $vgs = {};
96 eval {
97 run_command($cmd, outfunc => sub {
98 my $line = shift;
99
100 $line = trim($line);
101
102 my ($name, $size, $free) = split (':', $line);
103
104 $vgs->{$name} = { size => int ($size), free => int ($free) };
105 });
106 };
107 my $err = $@;
108
109 # just warn (vgs return error code 5 if clvmd does not run)
110 # but output is still OK (list without clustered VGs)
111 warn $err if $err;
112
113 return $vgs;
114}
115
116sub lvm_lvs {
117 my ($vgname) = @_;
118
119 my $cmd = ['/sbin/lvs', '--separator', ':', '--noheadings', '--units', 'b',
120 '--unbuffered', '--nosuffix', '--options',
121 'vg_name,lv_name,lv_size,uuid,tags'];
122
123 push @$cmd, $vgname if $vgname;
124
125 my $lvs = {};
126 run_command($cmd, outfunc => sub {
127 my $line = shift;
128
129 $line = trim($line);
130
131 my ($vg, $name, $size, $uuid, $tags) = split(':', $line);
132
133 return if $name !~ m/^vm-(\d+)-/;
134 my $nid = $1;
135
136 my $owner;
137 foreach my $tag (split (/,/, $tags)) {
138 if ($tag =~ m/^pve-vm-(\d+)$/) {
139 $owner = $1;
140 last;
141 }
142 }
143
144 if ($owner) {
145 if ($owner ne $nid) {
146 warn "owner mismatch name = $name, owner = $owner\n";
147 }
148
149 $lvs->{$vg}->{$name} = { format => 'raw', size => $size,
150 uuid => $uuid, tags => $tags,
151 vmid => $owner };
152 }
153 });
154
155 return $lvs;
156}
157
158# Configuration
159
160PVE::JSONSchema::register_format('pve-storage-vgname', \&parse_lvm_name);
161sub parse_lvm_name {
162 my ($name, $noerr) = @_;
163
164 if ($name !~ m/^[a-z][a-z0-9\-\_\.]*[a-z0-9]$/i) {
165 return undef if $noerr;
166 die "lvm name '$name' contains illegal characters\n";
167 }
168
169 return $name;
170}
171
172sub type {
173 return 'lvm';
174}
175
176sub plugindata {
177 return {
178 content => [ {images => 1}, { images => 1 }],
179 };
180}
181
182sub properties {
183 return {
184 vgname => {
185 description => "Volume group name.",
186 type => 'string', format => 'pve-storage-vgname',
187 },
188 base => {
189 description => "Base volume. This volume is automatically activated.",
190 type => 'string', format => 'pve-volume-id',
191 },
192 saferemove => {
193 description => "Zero-out data when removing LVs.",
194 type => 'boolean',
195 },
196 };
197}
198
199sub options {
200 return {
201 vgname => { fixed => 1 },
202 nodes => { optional => 1 },
203 shared => { optional => 1 },
204 disable => { optional => 1 },
205 saferemove => { optional => 1 },
206 content => { optional => 1 },
207 base => { fixed => 1, optional => 1 },
208 };
209}
210
211# Storage implementation
212
213sub parse_volname {
214 my ($class, $volname) = @_;
215
216 parse_lvm_name($volname);
217
218 if ($volname =~ m/^(vm-(\d+)-\S+)$/) {
219 return ('images', $1, $2);
220 }
221
222 die "unable to parse lvm volume name '$volname'\n";
223}
224
225sub path {
226 my ($class, $scfg, $volname) = @_;
227
228 my ($vtype, $name, $vmid) = $class->parse_volname($volname);
229
230 my $vg = $scfg->{vgname};
231
232 my $path = "/dev/$vg/$name";
233
5521b580 234 return wantarray ? ($path, $vmid, $vtype) : $path;
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235}
236
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237sub create_base {
238 my ($class, $storeid, $scfg, $volname) = @_;
239
240 die "can't create base images in lvm storage\n";
241}
242
243sub clone_image {
244 my ($class, $scfg, $storeid, $volname, $vmid) = @_;
245
246 die "can't clone images in lvm storage\n";
247}
248
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249sub alloc_image {
250 my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size) = @_;
251
252 die "unsupported format '$fmt'" if $fmt ne 'raw';
253
254 die "illegal name '$name' - sould be 'vm-$vmid-*'\n"
255 if $name && $name !~ m/^vm-$vmid-/;
256
257 my $vgs = lvm_vgs();
258
259 my $vg = $scfg->{vgname};
260
e8acaa3c 261 die "no such volume group '$vg'\n" if !defined ($vgs->{$vg});
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262
263 my $free = int($vgs->{$vg}->{free});
264
265 die "not enough free space ($free < $size)\n" if $free < $size;
266
267 if (!$name) {
268 my $lvs = lvm_lvs($vg);
269
270 for (my $i = 1; $i < 100; $i++) {
271 my $tn = "vm-$vmid-disk-$i";
272 if (!defined ($lvs->{$vg}->{$tn})) {
273 $name = $tn;
274 last;
275 }
276 }
277 }
278
279 die "unable to allocate an image name for VM $vmid in storage '$storeid'\n"
280 if !$name;
281
282 my $cmd = ['/sbin/lvcreate', '-aly', '--addtag', "pve-vm-$vmid", '--size', "${size}k", '--name', $name, $vg];
283
284 run_command($cmd, errmsg => "lvcreate '$vg/pve-vm-$vmid' error");
285
286 return $name;
287}
288
289sub free_image {
32437ed2 290 my ($class, $storeid, $scfg, $volname, $isBase) = @_;
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291
292 my $vg = $scfg->{vgname};
293
294 # we need to zero out LVM data for security reasons
295 # and to allow thin provisioning
296
297 my $zero_out_worker = sub {
298 print "zero-out data on image $volname\n";
299 my $cmd = ['dd', "if=/dev/zero", "of=/dev/$vg/del-$volname", "bs=1M"];
300 eval { run_command($cmd, errmsg => "zero out failed"); };
301 warn $@ if $@;
302
303 $class->cluster_lock_storage($storeid, $scfg->{shared}, undef, sub {
304 my $cmd = ['/sbin/lvremove', '-f', "$vg/del-$volname"];
305 run_command($cmd, errmsg => "lvremove '$vg/del-$volname' error");
306 });
307 print "successfully removed volume $volname\n";
308 };
309
310 if ($scfg->{saferemove}) {
311 # avoid long running task, so we only rename here
312 my $cmd = ['/sbin/lvrename', $vg, $volname, "del-$volname"];
313 run_command($cmd, errmsg => "lvrename '$vg/$volname' error");
314 return $zero_out_worker;
315 } else {
316 my $tmpvg = $scfg->{vgname};
317 my $cmd = ['/sbin/lvremove', '-f', "$tmpvg/$volname"];
318 run_command($cmd, errmsg => "lvremove '$tmpvg/$volname' error");
319 }
320
321 return undef;
322}
323
324sub list_images {
325 my ($class, $storeid, $scfg, $vmid, $vollist, $cache) = @_;
326
327 my $vgname = $scfg->{vgname};
328
329 $cache->{lvs} = lvm_lvs() if !$cache->{lvs};
330
331 my $res = [];
332
333 if (my $dat = $cache->{lvs}->{$vgname}) {
334
335 foreach my $volname (keys %$dat) {
336
337 my $owner = $dat->{$volname}->{vmid};
338
339 my $volid = "$storeid:$volname";
340
341 if ($vollist) {
342 my $found = grep { $_ eq $volid } @$vollist;
343 next if !$found;
344 } else {
345 next if defined ($vmid) && ($owner ne $vmid);
346 }
347
348 my $info = $dat->{$volname};
349 $info->{volid} = $volid;
350
351 push @$res, $info;
352 }
353 }
354
355 return $res;
356}
357
358sub status {
359 my ($class, $storeid, $scfg, $cache) = @_;
360
361 $cache->{vgs} = lvm_vgs() if !$cache->{vgs};
362
363 my $vgname = $scfg->{vgname};
364
365 my $total = 0;
366 my $free = 0;
367 my $used = 0;
368
369 if (my $info = $cache->{vgs}->{$vgname}) {
370 return ($info->{size}, $info->{free}, $total - $free, 1);
371 }
372
373 return undef;
374}
375
376sub activate_storage {
377 my ($class, $storeid, $scfg, $cache) = @_;
378
379 $cache->{vgs} = lvm_vgs() if !$cache->{vgs};
380
381 # In LVM2, vgscans take place automatically;
382 # this is just to be sure
383 if ($cache->{vgs} && !$cache->{vgscaned} &&
384 !$cache->{vgs}->{$scfg->{vgname}}) {
385 $cache->{vgscaned} = 1;
386 my $cmd = ['/sbin/vgscan', '--ignorelockingfailure', '--mknodes'];
387 eval { run_command($cmd, outfunc => sub {}); };
388 warn $@ if $@;
389 }
390
391 # we do not acticate any volumes here ('vgchange -aly')
392 # instead, volumes are activate individually later
393}
394
395sub deactivate_storage {
396 my ($class, $storeid, $scfg, $cache) = @_;
397
398 my $cmd = ['/sbin/vgchange', '-aln', $scfg->{vgname}];
399 run_command($cmd, errmsg => "can't deactivate VG '$scfg->{vgname}'");
400}
401
402sub activate_volume {
403 my ($class, $storeid, $scfg, $volname, $exclusive, $cache) = @_;
404
405 my $path = $class->path($scfg, $volname);
406
407 my $lvm_activate_mode = $exclusive ? 'ey' : 'ly';
408
409 my $cmd = ['/sbin/lvchange', "-a$lvm_activate_mode", $path];
410 run_command($cmd, errmsg => "can't activate LV '$path'");
411}
412
413sub deactivate_volume {
414 my ($class, $storeid, $scfg, $volname, $cache) = @_;
415
416 my $path = $class->path($scfg, $volname);
417 return if ! -b $path;
418
419 my $cmd = ['/sbin/lvchange', '-aln', $path];
420 run_command($cmd, errmsg => "can't deactivate LV '$path'");
421}
422
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423sub volume_resize {
424 my ($class, $scfg, $storeid, $volname, $size, $running) = @_;
425
426 $size = ($size/1024/1024) . "M";
427
428 my $path = $class->path($scfg, $volname);
429 my $cmd = ['/sbin/lvextend', '-L', $size, $path];
430 run_command($cmd, errmsg => "error resizing volume '$path'");
431
432 return 1;
433}
434
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435sub volume_snapshot {
436 my ($class, $scfg, $storeid, $volname, $snap, $running) = @_;
437
438 die "lvm snapshot is not implemented";
439}
440
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441sub volume_snapshot_rollback {
442 my ($class, $scfg, $storeid, $volname, $snap) = @_;
443
444 die "lvm snapshot rollback is not implemented";
445}
446
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447sub volume_snapshot_delete {
448 my ($class, $scfg, $storeid, $volname, $snap) = @_;
449
450 die "lvm snapshot delete is not implemented";
451}
452
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453sub volume_has_feature {
454 my ($class, $scfg, $feature, $storeid, $volname, $snapname, $running) = @_;
455
456 return undef;
457}
458
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