1/*	$NetBSD: pvremove.c,v 1.1.1.2 2009/12/02 00:25:54 haad Exp $	*/
2
3/*
4 * Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
5 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
6 *
7 * This file is part of LVM2.
8 *
9 * This copyrighted material is made available to anyone wishing to use,
10 * modify, copy, or redistribute it subject to the terms and conditions
11 * of the GNU Lesser General Public License v.2.1.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16 */
17
18#include "tools.h"
19
20const char _really_wipe[] =
21    "Really WIPE LABELS from physical volume \"%s\" of volume group \"%s\" [y/n]? ";
22
23/*
24 * Decide whether it is "safe" to wipe the labels on this device.
25 * 0 indicates we may not.
26 */
27static int pvremove_check(struct cmd_context *cmd, const char *name)
28{
29	struct physical_volume *pv;
30	struct dm_list mdas;
31
32	dm_list_init(&mdas);
33
34	/* FIXME Check partition type is LVM unless --force is given */
35
36	/* Is there a pv here already? */
37	/* If not, this is an error unless you used -f. */
38	if (!(pv = pv_read(cmd, name, &mdas, NULL, 1, 0))) {
39		if (arg_count(cmd, force_ARG))
40			return 1;
41		log_error("Physical Volume %s not found", name);
42		return 0;
43	}
44
45	/*
46	 * If a PV has no MDAs it may appear to be an
47	 * orphan until the metadata is read off
48	 * another PV in the same VG.  Detecting this
49	 * means checking every VG by scanning every
50	 * PV on the system.
51	 */
52	if (is_orphan(pv) && !dm_list_size(&mdas)) {
53		if (!scan_vgs_for_pvs(cmd)) {
54			log_error("Rescan for PVs without metadata areas "
55				  "failed.");
56			return 0;
57		}
58		if (!(pv = pv_read(cmd, name, NULL, NULL, 1, 0))) {
59			log_error("Failed to read physical volume %s", name);
60			return 0;
61		}
62	}
63
64	/* orphan ? */
65	if (is_orphan(pv))
66		return 1;
67
68	/* Allow partial & exported VGs to be destroyed. */
69	/* we must have -ff to overwrite a non orphan */
70	if (arg_count(cmd, force_ARG) < 2) {
71		log_error("Can't pvremove physical volume \"%s\" of "
72			  "volume group \"%s\" without -ff", name, pv_vg_name(pv));
73		return 0;
74	}
75
76	/* prompt */
77	if (!arg_count(cmd, yes_ARG) &&
78	    yes_no_prompt(_really_wipe, name, pv_vg_name(pv)) == 'n') {
79		log_print("%s: physical volume label not removed", name);
80		return 0;
81	}
82
83	if (arg_count(cmd, force_ARG)) {
84		log_warn("WARNING: Wiping physical volume label from "
85			  "%s%s%s%s", name,
86			  !is_orphan(pv) ? " of volume group \"" : "",
87			  !is_orphan(pv) ? pv_vg_name(pv) : "",
88			  !is_orphan(pv) ? "\"" : "");
89	}
90
91	return 1;
92}
93
94static int pvremove_single(struct cmd_context *cmd, const char *pv_name,
95			   void *handle __attribute((unused)))
96{
97	struct device *dev;
98	int ret = ECMD_FAILED;
99
100	if (!lock_vol(cmd, VG_ORPHANS, LCK_VG_WRITE)) {
101		log_error("Can't get lock for orphan PVs");
102		return ECMD_FAILED;
103	}
104
105	if (!pvremove_check(cmd, pv_name))
106		goto error;
107
108	if (!(dev = dev_cache_get(pv_name, cmd->filter))) {
109		log_error("%s: Couldn't find device.  Check your filters?",
110			  pv_name);
111		goto error;
112	}
113
114	if (!dev_test_excl(dev)) {
115		/* FIXME Detect whether device-mapper is still using the device */
116		log_error("Can't open %s exclusively - not removing. "
117			  "Mounted filesystem?", dev_name(dev));
118		goto error;
119	}
120
121	/* Wipe existing label(s) */
122	if (!label_remove(dev)) {
123		log_error("Failed to wipe existing label(s) on %s", pv_name);
124		goto error;
125	}
126
127	log_print("Labels on physical volume \"%s\" successfully wiped",
128		  pv_name);
129
130	ret = ECMD_PROCESSED;
131
132      error:
133	unlock_vg(cmd, VG_ORPHANS);
134
135	return ret;
136}
137
138int pvremove(struct cmd_context *cmd, int argc, char **argv)
139{
140	int i, r;
141	int ret = ECMD_PROCESSED;
142
143	if (!argc) {
144		log_error("Please enter a physical volume path");
145		return EINVALID_CMD_LINE;
146	}
147
148	if (arg_count(cmd, yes_ARG) && !arg_count(cmd, force_ARG)) {
149		log_error("Option y can only be given with option f");
150		return EINVALID_CMD_LINE;
151	}
152
153	for (i = 0; i < argc; i++) {
154		r = pvremove_single(cmd, argv[i], NULL);
155		if (r > ret)
156			ret = r;
157	}
158
159	return ret;
160}
161