1 /* $NetBSD: disk_rep.c,v 1.1.1.2 2009/12/02 00:26:50 haad Exp $ */
4 * Copyright (C) 1997-2004 Sistina Software, Inc. All rights reserved.
5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
7 * This file is part of LVM2.
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.
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
28 /* FIXME: memcpy might not be portable */
29 #define CPIN_8(x, y, z) {memcpy((x), (y), (z));}
30 #define CPOUT_8(x, y, z) {memcpy((y), (x), (z));}
31 #define CPIN_16(x, y) {(x) = xlate16_be((y));}
32 #define CPOUT_16(x, y) {(y) = xlate16_be((x));}
33 #define CPIN_32(x, y) {(x) = xlate32_be((y));}
34 #define CPOUT_32(x, y) {(y) = xlate32_be((x));}
35 #define CPIN_64(x, y) {(x) = xlate64_be((y));}
36 #define CPOUT_64(x, y) {(y) = xlate64_be((x));}
38 static int __read_pool_disk(const struct format_type *fmt, struct device *dev,
39 struct dm_pool *mem __attribute((unused)), struct pool_list *pl,
40 const char *vg_name __attribute((unused)))
42 char buf[512] __attribute((aligned(8)));
44 /* FIXME: Need to check the cache here first */
45 if (!dev_read(dev, UINT64_C(0), 512, buf)) {
46 log_very_verbose("Failed to read PV data from %s",
51 if (!read_pool_label(pl, fmt->labeller, dev, buf, NULL))
57 static void _add_pl_to_list(struct dm_list *head, struct pool_list *data)
61 dm_list_iterate_items(pl, head) {
62 if (id_equal(&data->pv_uuid, &pl->pv_uuid)) {
63 char uuid[ID_LEN + 7] __attribute((aligned(8)));
65 id_write_format(&pl->pv_uuid, uuid, ID_LEN + 7);
67 if (!dev_subsystem_part_major(data->dev)) {
68 log_very_verbose("Ignoring duplicate PV %s on "
73 log_very_verbose("Duplicate PV %s - using %s %s",
74 uuid, dev_subsystem_name(data->dev),
76 dm_list_del(&pl->list);
80 dm_list_add(head, &data->list);
83 int read_pool_label(struct pool_list *pl, struct labeller *l,
84 struct device *dev, char *buf, struct label **label)
86 struct lvmcache_info *info;
89 char uuid[ID_LEN + 7] __attribute((aligned(8)));
90 struct pool_disk *pd = &pl->pd;
92 pool_label_in(pd, buf);
94 get_pool_pv_uuid(&pvid, pd);
95 id_write_format(&pvid, uuid, ID_LEN + 7);
96 log_debug("Calculated uuid %s for %s", uuid, dev_name(dev));
98 get_pool_vg_uuid(&vgid, pd);
99 id_write_format(&vgid, uuid, ID_LEN + 7);
100 log_debug("Calculated uuid %s for %s", uuid, pd->pl_pool_name);
102 if (!(info = lvmcache_add(l, (char *) &pvid, dev, pd->pl_pool_name,
106 *label = info->label;
108 info->device_size = xlate32_be(pd->pl_blocks) << SECTOR_SHIFT;
109 dm_list_init(&info->mdas);
111 info->status &= ~CACHE_INVALID;
115 memcpy(&pl->pv_uuid, &pvid, sizeof(pvid));
121 * pool_label_out - copies a pool_label_t into a char buffer
122 * @pl: ptr to a pool_label_t struct
123 * @buf: ptr to raw space where label info will be copied
125 * This function is important because it takes care of all of
126 * the endian issues when copying to disk. This way, when
127 * machines of different architectures are used, they will
128 * be able to interpret ondisk labels correctly. Always use
129 * this function before writing to disk.
131 void pool_label_out(struct pool_disk *pl, void *buf)
133 struct pool_disk *bufpl = (struct pool_disk *) buf;
135 CPOUT_64(pl->pl_magic, bufpl->pl_magic);
136 CPOUT_64(pl->pl_pool_id, bufpl->pl_pool_id);
137 CPOUT_8(pl->pl_pool_name, bufpl->pl_pool_name, POOL_NAME_SIZE);
138 CPOUT_32(pl->pl_version, bufpl->pl_version);
139 CPOUT_32(pl->pl_subpools, bufpl->pl_subpools);
140 CPOUT_32(pl->pl_sp_id, bufpl->pl_sp_id);
141 CPOUT_32(pl->pl_sp_devs, bufpl->pl_sp_devs);
142 CPOUT_32(pl->pl_sp_devid, bufpl->pl_sp_devid);
143 CPOUT_32(pl->pl_sp_type, bufpl->pl_sp_type);
144 CPOUT_64(pl->pl_blocks, bufpl->pl_blocks);
145 CPOUT_32(pl->pl_striping, bufpl->pl_striping);
146 CPOUT_32(pl->pl_sp_dmepdevs, bufpl->pl_sp_dmepdevs);
147 CPOUT_32(pl->pl_sp_dmepid, bufpl->pl_sp_dmepid);
148 CPOUT_32(pl->pl_sp_weight, bufpl->pl_sp_weight);
149 CPOUT_32(pl->pl_minor, bufpl->pl_minor);
150 CPOUT_32(pl->pl_padding, bufpl->pl_padding);
151 CPOUT_8(pl->pl_reserve, bufpl->pl_reserve, 184);
155 * pool_label_in - copies a char buffer into a pool_label_t
156 * @pl: ptr to a pool_label_t struct
157 * @buf: ptr to raw space where label info is copied from
159 * This function is important because it takes care of all of
160 * the endian issues when information from disk is about to be
161 * used. This way, when machines of different architectures
162 * are used, they will be able to interpret ondisk labels
163 * correctly. Always use this function before using labels that
164 * were read from disk.
166 void pool_label_in(struct pool_disk *pl, void *buf)
168 struct pool_disk *bufpl = (struct pool_disk *) buf;
170 CPIN_64(pl->pl_magic, bufpl->pl_magic);
171 CPIN_64(pl->pl_pool_id, bufpl->pl_pool_id);
172 CPIN_8(pl->pl_pool_name, bufpl->pl_pool_name, POOL_NAME_SIZE);
173 CPIN_32(pl->pl_version, bufpl->pl_version);
174 CPIN_32(pl->pl_subpools, bufpl->pl_subpools);
175 CPIN_32(pl->pl_sp_id, bufpl->pl_sp_id);
176 CPIN_32(pl->pl_sp_devs, bufpl->pl_sp_devs);
177 CPIN_32(pl->pl_sp_devid, bufpl->pl_sp_devid);
178 CPIN_32(pl->pl_sp_type, bufpl->pl_sp_type);
179 CPIN_64(pl->pl_blocks, bufpl->pl_blocks);
180 CPIN_32(pl->pl_striping, bufpl->pl_striping);
181 CPIN_32(pl->pl_sp_dmepdevs, bufpl->pl_sp_dmepdevs);
182 CPIN_32(pl->pl_sp_dmepid, bufpl->pl_sp_dmepid);
183 CPIN_32(pl->pl_sp_weight, bufpl->pl_sp_weight);
184 CPIN_32(pl->pl_minor, bufpl->pl_minor);
185 CPIN_32(pl->pl_padding, bufpl->pl_padding);
186 CPIN_8(pl->pl_reserve, bufpl->pl_reserve, 184);
189 static char _calc_char(unsigned int id)
192 * [0-9A-Za-z!#] - 64 printable chars (6-bits)
198 return (id - 10) + 65;
200 return (id - 36) + 97;
209 void get_pool_uuid(char *uuid, uint64_t poolid, uint32_t spid, uint32_t devid)
212 unsigned shifter = 0x003F;
214 assert(ID_LEN == 32);
215 memset(uuid, 0, ID_LEN);
216 strcat(uuid, "POOL0000000000");
218 /* We grab the entire 64 bits (+2 that get shifted in) */
219 for (i = 13; i < 24; i++) {
220 uuid[i] = _calc_char(((unsigned) poolid) & shifter);
221 poolid = poolid >> 6;
224 /* We grab the entire 32 bits (+4 that get shifted in) */
225 for (i = 24; i < 30; i++) {
226 uuid[i] = _calc_char((unsigned) (spid & shifter));
231 * Since we can only have 128 devices, we only worry about the
234 for (i = 30; i < 32; i++) {
235 uuid[i] = _calc_char((unsigned) (devid & shifter));
241 static int _read_vg_pds(const struct format_type *fmt, struct dm_pool *mem,
242 struct lvmcache_vginfo *vginfo, struct dm_list *head,
245 struct lvmcache_info *info;
246 struct pool_list *pl = NULL;
247 struct dm_pool *tmpmem;
249 uint32_t sp_count = 0;
250 uint32_t *sp_devs = NULL;
253 /* FIXME: maybe should return a different error in memory
254 * allocation failure */
255 if (!(tmpmem = dm_pool_create("pool read_vg", 512)))
258 dm_list_iterate_items(info, &vginfo->infos) {
260 !(pl = read_pool_disk(fmt, info->dev, mem, vginfo->vgname)))
263 * We need to keep track of the total expected number
264 * of devices per subpool
267 /* FIXME pl left uninitialised if !info->dev */
268 sp_count = pl->pd.pl_subpools;
270 dm_pool_zalloc(tmpmem,
271 sizeof(uint32_t) * sp_count))) {
272 log_error("Unable to allocate %d 32-bit uints",
274 dm_pool_destroy(tmpmem);
279 * watch out for a pool label with a different subpool
280 * count than the original - give up if it does
282 if (sp_count != pl->pd.pl_subpools)
285 _add_pl_to_list(head, pl);
287 if (sp_count > pl->pd.pl_sp_id && sp_devs[pl->pd.pl_sp_id] == 0)
288 sp_devs[pl->pd.pl_sp_id] = pl->pd.pl_sp_devs;
292 for (i = 0; i < sp_count; i++)
293 *devcount += sp_devs[i];
295 dm_pool_destroy(tmpmem);
297 if (pl && *pl->pd.pl_pool_name)
304 int read_pool_pds(const struct format_type *fmt, const char *vg_name,
305 struct dm_pool *mem, struct dm_list *pdhead)
307 struct lvmcache_vginfo *vginfo;
313 * If the cache scanning doesn't work, this will never work
315 if (vg_name && (vginfo = vginfo_from_vgname(vg_name, NULL)) &&
318 if (_read_vg_pds(fmt, mem, vginfo, pdhead, &totaldevs)) {
320 * If we found all the devices we were
321 * expecting, return success
323 if (dm_list_size(pdhead) == totaldevs)
327 * accept partial pool if we've done a full
328 * rescan of the cache
335 dm_list_init(pdhead);
339 log_debug("No devices for vg %s found in cache",
343 lvmcache_label_scan(fmt->cmd, full_scan);
349 struct pool_list *read_pool_disk(const struct format_type *fmt,
350 struct device *dev, struct dm_pool *mem,
353 struct pool_list *pl;
358 if (!(pl = dm_pool_zalloc(mem, sizeof(*pl)))) {
359 log_error("Unable to allocate pool list structure");
363 if (!__read_pool_disk(fmt, dev, mem, pl, vg_name))