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nexenta: add volume_snapshot
[pve-storage.git] / PVE / Storage / LVMPlugin.pm
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1dc01b9f
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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) : $path;
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235}
236
237sub alloc_image {
238 my ($class, $storeid, $scfg, $vmid, $fmt, $name, $size) = @_;
239
240 die "unsupported format '$fmt'" if $fmt ne 'raw';
241
242 die "illegal name '$name' - sould be 'vm-$vmid-*'\n"
243 if $name && $name !~ m/^vm-$vmid-/;
244
245 my $vgs = lvm_vgs();
246
247 my $vg = $scfg->{vgname};
248
249 die "no such volume gruoup '$vg'\n" if !defined ($vgs->{$vg});
250
251 my $free = int($vgs->{$vg}->{free});
252
253 die "not enough free space ($free < $size)\n" if $free < $size;
254
255 if (!$name) {
256 my $lvs = lvm_lvs($vg);
257
258 for (my $i = 1; $i < 100; $i++) {
259 my $tn = "vm-$vmid-disk-$i";
260 if (!defined ($lvs->{$vg}->{$tn})) {
261 $name = $tn;
262 last;
263 }
264 }
265 }
266
267 die "unable to allocate an image name for VM $vmid in storage '$storeid'\n"
268 if !$name;
269
270 my $cmd = ['/sbin/lvcreate', '-aly', '--addtag', "pve-vm-$vmid", '--size', "${size}k", '--name', $name, $vg];
271
272 run_command($cmd, errmsg => "lvcreate '$vg/pve-vm-$vmid' error");
273
274 return $name;
275}
276
277sub free_image {
278 my ($class, $storeid, $scfg, $volname) = @_;
279
280 my $vg = $scfg->{vgname};
281
282 # we need to zero out LVM data for security reasons
283 # and to allow thin provisioning
284
285 my $zero_out_worker = sub {
286 print "zero-out data on image $volname\n";
287 my $cmd = ['dd', "if=/dev/zero", "of=/dev/$vg/del-$volname", "bs=1M"];
288 eval { run_command($cmd, errmsg => "zero out failed"); };
289 warn $@ if $@;
290
291 $class->cluster_lock_storage($storeid, $scfg->{shared}, undef, sub {
292 my $cmd = ['/sbin/lvremove', '-f', "$vg/del-$volname"];
293 run_command($cmd, errmsg => "lvremove '$vg/del-$volname' error");
294 });
295 print "successfully removed volume $volname\n";
296 };
297
298 if ($scfg->{saferemove}) {
299 # avoid long running task, so we only rename here
300 my $cmd = ['/sbin/lvrename', $vg, $volname, "del-$volname"];
301 run_command($cmd, errmsg => "lvrename '$vg/$volname' error");
302 return $zero_out_worker;
303 } else {
304 my $tmpvg = $scfg->{vgname};
305 my $cmd = ['/sbin/lvremove', '-f', "$tmpvg/$volname"];
306 run_command($cmd, errmsg => "lvremove '$tmpvg/$volname' error");
307 }
308
309 return undef;
310}
311
312sub list_images {
313 my ($class, $storeid, $scfg, $vmid, $vollist, $cache) = @_;
314
315 my $vgname = $scfg->{vgname};
316
317 $cache->{lvs} = lvm_lvs() if !$cache->{lvs};
318
319 my $res = [];
320
321 if (my $dat = $cache->{lvs}->{$vgname}) {
322
323 foreach my $volname (keys %$dat) {
324
325 my $owner = $dat->{$volname}->{vmid};
326
327 my $volid = "$storeid:$volname";
328
329 if ($vollist) {
330 my $found = grep { $_ eq $volid } @$vollist;
331 next if !$found;
332 } else {
333 next if defined ($vmid) && ($owner ne $vmid);
334 }
335
336 my $info = $dat->{$volname};
337 $info->{volid} = $volid;
338
339 push @$res, $info;
340 }
341 }
342
343 return $res;
344}
345
346sub status {
347 my ($class, $storeid, $scfg, $cache) = @_;
348
349 $cache->{vgs} = lvm_vgs() if !$cache->{vgs};
350
351 my $vgname = $scfg->{vgname};
352
353 my $total = 0;
354 my $free = 0;
355 my $used = 0;
356
357 if (my $info = $cache->{vgs}->{$vgname}) {
358 return ($info->{size}, $info->{free}, $total - $free, 1);
359 }
360
361 return undef;
362}
363
364sub activate_storage {
365 my ($class, $storeid, $scfg, $cache) = @_;
366
367 $cache->{vgs} = lvm_vgs() if !$cache->{vgs};
368
369 # In LVM2, vgscans take place automatically;
370 # this is just to be sure
371 if ($cache->{vgs} && !$cache->{vgscaned} &&
372 !$cache->{vgs}->{$scfg->{vgname}}) {
373 $cache->{vgscaned} = 1;
374 my $cmd = ['/sbin/vgscan', '--ignorelockingfailure', '--mknodes'];
375 eval { run_command($cmd, outfunc => sub {}); };
376 warn $@ if $@;
377 }
378
379 # we do not acticate any volumes here ('vgchange -aly')
380 # instead, volumes are activate individually later
381}
382
383sub deactivate_storage {
384 my ($class, $storeid, $scfg, $cache) = @_;
385
386 my $cmd = ['/sbin/vgchange', '-aln', $scfg->{vgname}];
387 run_command($cmd, errmsg => "can't deactivate VG '$scfg->{vgname}'");
388}
389
390sub activate_volume {
391 my ($class, $storeid, $scfg, $volname, $exclusive, $cache) = @_;
392
393 my $path = $class->path($scfg, $volname);
394
395 my $lvm_activate_mode = $exclusive ? 'ey' : 'ly';
396
397 my $cmd = ['/sbin/lvchange', "-a$lvm_activate_mode", $path];
398 run_command($cmd, errmsg => "can't activate LV '$path'");
399}
400
401sub deactivate_volume {
402 my ($class, $storeid, $scfg, $volname, $cache) = @_;
403
404 my $path = $class->path($scfg, $volname);
405 return if ! -b $path;
406
407 my $cmd = ['/sbin/lvchange', '-aln', $path];
408 run_command($cmd, errmsg => "can't deactivate LV '$path'");
409}
410
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411sub volume_resize {
412 my ($class, $scfg, $storeid, $volname, $size, $running) = @_;
413
414 $size = ($size/1024/1024) . "M";
415
416 my $path = $class->path($scfg, $volname);
417 my $cmd = ['/sbin/lvextend', '-L', $size, $path];
418 run_command($cmd, errmsg => "error resizing volume '$path'");
419
420 return 1;
421}
422
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