1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009-2011 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 #include "optgroups.h"
35 optgroup_lvm2_available (void)
37 return prog_exists ("lvm");
40 /* LVM actions. Keep an eye on liblvm, although at the time
41 * of writing it hasn't progressed very far.
45 convert_lvm_output (char *out, const char *prefix)
49 int size = 0, alloc = 0;
56 pend = strchr (p, '\n'); /* Get the next line of output. */
62 while (*p && c_isspace (*p)) /* Skip any leading whitespace. */
65 /* Sigh, skip trailing whitespace too. "pvs", I'm looking at you. */
67 while (*p && c_isspace (p[len]))
70 if (!*p) { /* Empty line? Skip it. */
77 snprintf (buf, sizeof buf, "%s%s", prefix, p);
82 if (add_string (&r, &size, &alloc, str) == -1) {
92 if (add_string (&r, &size, &alloc, NULL) == -1)
95 sort_strings (r, size-1);
105 r = command (&out, &err,
106 "lvm", "pvs", "-o", "pv_name", "--noheadings", NULL);
108 reply_with_error ("%s", err);
116 return convert_lvm_output (out, NULL);
125 r = command (&out, &err,
126 "lvm", "vgs", "-o", "vg_name", "--noheadings", NULL);
128 reply_with_error ("%s", err);
136 return convert_lvm_output (out, NULL);
145 r = command (&out, &err,
147 "-o", "vg_name,lv_name", "--noheadings",
148 "--separator", "/", NULL);
150 reply_with_error ("%s", err);
158 return convert_lvm_output (out, "/dev/");
161 /* These were so complex to implement that I ended up auto-generating
162 * the code. That code is in stubs.c, and it is generated as usual
165 guestfs_int_lvm_pv_list *
168 return parse_command_line_pvs ();
171 guestfs_int_lvm_vg_list *
174 return parse_command_line_vgs ();
177 guestfs_int_lvm_lv_list *
180 return parse_command_line_lvs ();
184 do_pvcreate (const char *device)
189 r = command (NULL, &err,
190 "lvm", "pvcreate", device, NULL);
192 reply_with_error ("%s", err);
205 do_vgcreate (const char *volgroup, char *const *physvols)
211 argc = count_strings (physvols) + 3;
212 argv = malloc (sizeof (char *) * (argc + 1));
214 reply_with_perror ("malloc");
218 argv[1] = "vgcreate";
220 for (i = 3; i <= argc; ++i)
221 argv[i] = physvols[i-3];
223 r = commandv (NULL, &err, (const char * const*) argv);
225 reply_with_error ("%s", err);
240 do_lvcreate (const char *logvol, const char *volgroup, int mbytes)
246 snprintf (size, sizeof size, "%d", mbytes);
248 r = command (NULL, &err,
250 "-L", size, "-n", logvol, volgroup, NULL);
252 reply_with_error ("%s", err);
265 do_lvresize (const char *logvol, int mbytes)
271 snprintf (size, sizeof size, "%d", mbytes);
273 r = command (NULL, &err,
275 "--force", "-L", size, logvol, NULL);
277 reply_with_error ("%s", err);
287 do_lvresize_free (const char *logvol, int percent)
292 if (percent < 0 || percent > 100) {
293 reply_with_error ("percentage must be [0..100] (was %d)", percent);
298 snprintf (size, sizeof size, "+%d%%FREE", percent);
300 r = command (NULL, &err,
301 "lvm", "lvresize", "-l", size, logvol, NULL);
303 reply_with_error ("%s", err);
312 /* Super-dangerous command used for testing. It removes all
313 * LVs, VGs and PVs permanently.
316 do_lvm_remove_all (void)
327 for (i = 0; xs[i] != NULL; ++i) {
328 /* Deactivate the LV first. On Ubuntu, lvremove '-f' option
329 * does not remove active LVs reliably.
331 (void) command (NULL, NULL, "lvm", "lvchange", "-an", xs[i], NULL);
334 r = command (NULL, &err, "lvm", "lvremove", "-f", xs[i], NULL);
336 reply_with_error ("lvremove: %s: %s", xs[i], err);
350 for (i = 0; xs[i] != NULL; ++i) {
351 /* Deactivate the VG first, see note above. */
352 (void) command (NULL, NULL, "lvm", "vgchange", "-an", xs[i], NULL);
355 r = command (NULL, &err, "lvm", "vgremove", "-f", xs[i], NULL);
357 reply_with_error ("vgremove: %s: %s", xs[i], err);
371 for (i = 0; xs[i] != NULL; ++i) {
372 r = command (NULL, &err, "lvm", "pvremove", "-f", xs[i], NULL);
374 reply_with_error ("pvremove: %s: %s", xs[i], err);
385 /* There, that was easy, sorry about your data. */
390 do_lvremove (const char *device)
395 r = command (NULL, &err,
396 "lvm", "lvremove", "-f", device, NULL);
398 reply_with_error ("%s", err);
411 do_vgremove (const char *device)
416 r = command (NULL, &err,
417 "lvm", "vgremove", "-f", device, NULL);
419 reply_with_error ("%s", err);
432 do_pvremove (const char *device)
437 r = command (NULL, &err,
438 "lvm", "pvremove", "-ff", device, NULL);
440 reply_with_error ("%s", err);
453 do_pvresize (const char *device)
458 r = command (NULL, &err,
459 "lvm", "pvresize", device, NULL);
461 reply_with_error ("%s: %s", device, err);
471 do_pvresize_size (const char *device, int64_t size)
477 snprintf (buf, sizeof buf, "%" PRIi64 "b", size);
479 r = command (NULL, &err,
481 "--setphysicalvolumesize", buf,
484 reply_with_error ("%s: %s", device, err);
494 do_vg_activate (int activate, char *const *volgroups)
500 argc = count_strings (volgroups) + 4;
501 argv = malloc (sizeof (char *) * (argc+1));
503 reply_with_perror ("malloc");
508 argv[1] = "vgchange";
510 argv[3] = activate ? "y" : "n";
511 for (i = 4; i <= argc; ++i)
512 argv[i] = volgroups[i-4];
514 r = commandv (NULL, &err, (const char * const*) argv);
516 reply_with_error ("vgchange: %s", err);
531 do_vg_activate_all (int activate)
533 char *empty[] = { NULL };
534 return do_vg_activate (activate, empty);
538 do_lvrename (const char *logvol, const char *newlogvol)
543 r = command (NULL, &err,
545 logvol, newlogvol, NULL);
547 reply_with_error ("%s -> %s: %s", logvol, newlogvol, err);
560 do_vgrename (const char *volgroup, const char *newvolgroup)
565 r = command (NULL, &err,
567 volgroup, newvolgroup, NULL);
569 reply_with_error ("%s -> %s: %s", volgroup, newvolgroup, err);
582 get_lvm_field (const char *cmd, const char *field, const char *device)
586 int r = command (&out, &err,
588 "--unbuffered", "--noheadings", "-o", field,
591 reply_with_error ("%s: %s", device, err);
600 return out; /* Caller frees. */
604 do_pvuuid (const char *device)
606 return get_lvm_field ("pvs", "pv_uuid", device);
610 do_vguuid (const char *vgname)
612 return get_lvm_field ("vgs", "vg_uuid", vgname);
616 do_lvuuid (const char *device)
618 return get_lvm_field ("lvs", "lv_uuid", device);
622 get_lvm_fields (const char *cmd, const char *field, const char *device)
626 int r = command (&out, &err,
628 "--unbuffered", "--noheadings", "-o", field,
631 reply_with_error ("%s: %s", device, err);
639 char **ret = split_lines (out);
646 for (i = 0; ret[i] != NULL; ++i)
653 do_vgpvuuids (const char *vgname)
655 return get_lvm_fields ("vgs", "pv_uuid", vgname);
659 do_vglvuuids (const char *vgname)
661 return get_lvm_fields ("vgs", "lv_uuid", vgname);
670 r = command (NULL, &err,
671 "lvm", "vgscan", NULL);
673 reply_with_error ("%s", err);
682 /* Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0
683 * to a canonical one.
685 * This is harder than it should be. A LV device like /dev/VG/LV is
686 * really a symlink to a device-mapper device like /dev/dm-0. However
687 * at the device-mapper (kernel) level, nothing is really known about
688 * LVM (a userspace concept). Therefore we use a convoluted method to
689 * determine this, by listing out known LVs and checking whether the
690 * rdev (major/minor) of the device we are passed matches any of them.
692 * Note use of 'stat' instead of 'lstat' so that symlinks are fully
696 * 1 = conversion was successful, path is an LV
697 * '*ret' is set to the updated path if 'ret' is non-NULL.
698 * 0 = path is not an LV
699 * -1 = error, reply_with_* has been called
703 lv_canonical (const char *device, char **ret)
705 struct stat stat1, stat2;
707 int r = stat (device, &stat1);
709 reply_with_perror ("stat: %s", device);
713 char **lvs = do_lvs ();
718 for (i = 0; lvs[i] != NULL; ++i) {
719 r = stat (lvs[i], &stat2);
721 reply_with_perror ("stat: %s", lvs[i]);
725 if (stat1.st_rdev == stat2.st_rdev) { /* found it */
727 *ret = strdup (lvs[i]);
729 reply_with_perror ("strdup");
744 /* Test if a device is a logical volume (RHBZ#619793). */
746 do_is_lv (const char *device)
748 return lv_canonical (device, NULL);
751 /* Return canonical name of LV to caller (RHBZ#638899). */
753 do_lvm_canonical_lv_name (const char *device)
756 int r = lv_canonical (device, &canonical);
761 reply_with_error ("%s: not a logical volume", device);
765 return canonical; /* caller frees */
768 /* List everything in /dev/mapper which *isn't* an LV (RHBZ#688062). */
770 do_list_dm_devices (void)
773 int size = 0, alloc = 0;
778 dir = opendir ("/dev/mapper");
780 reply_with_perror ("opendir: /dev/mapper");
787 if (d == NULL) break;
789 /* Ignore . and .. */
790 if (STREQ (d->d_name, ".") || STREQ (d->d_name, ".."))
793 /* Ignore /dev/mapper/control which is used internally by dm. */
794 if (STREQ (d->d_name, "control"))
797 size_t len = strlen (d->d_name);
798 char devname[len+64];
800 snprintf (devname, len+64, "/dev/mapper/%s", d->d_name);
802 /* Ignore dm devices which are LVs. */
803 r = lv_canonical (devname, NULL);
805 free_stringslen (ret, size);
812 /* Not an LV, so add it. */
813 if (add_string (&ret, &size, &alloc, devname) == -1) {
819 /* Did readdir fail? */
821 reply_with_perror ("readdir: /dev/mapper");
822 free_stringslen (ret, size);
827 /* Close the directory handle. */
828 if (closedir (dir) == -1) {
829 reply_with_perror ("closedir: /dev/mapper");
830 free_stringslen (ret, size);
834 /* Sort the output (may be empty). */
836 sort_strings (ret, size);
838 /* NULL-terminate the list. */
839 if (add_string (&ret, &size, &alloc, NULL) == -1)