external/gpl2/lvm2/dist/lib/format1/lvm1-label.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2006 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 "lib.h"
  19 #include "lvm1-label.h"
  20 #include "disk-rep.h"
  21 #include "label.h"
  22 #include "metadata.h"
  23 #include "xlate.h"
  24 #include "format1.h"
  25
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28
  29 static void _not_supported(const char *op)
  30 {
  31         log_error("The '%s' operation is not supported for the lvm1 labeller.",
  32                   op);
  33 }
  34
  35 static int _lvm1_can_handle(struct labeller *l __attribute((unused)), void *buf, uint64_t sector)
  36 {
  37         struct pv_disk *pvd = (struct pv_disk *) buf;
  38         uint32_t version;
  39
  40         /* LVM1 label must always be in first sector */
  41         if (sector)
  42                 return 0;
  43
  44         version = xlate16(pvd->version);
  45
  46         if (pvd->id[0] == 'H' && pvd->id[1] == 'M' &&
  47             (version == 1 || version == 2))
  48                 return 1;
  49
  50         return 0;
  51 }
  52
  53 static int _lvm1_write(struct label *label __attribute((unused)), void *buf __attribute((unused)))
  54 {
  55         _not_supported("write");
  56         return 0;
  57 }
  58
  59 static int _lvm1_read(struct labeller *l, struct device *dev, void *buf,
  60                  struct label **label)
  61 {
  62         struct pv_disk *pvd = (struct pv_disk *) buf;
  63         struct vg_disk vgd;
  64         struct lvmcache_info *info;
  65         const char *vgid = FMT_LVM1_ORPHAN_VG_NAME;
  66         const char *vgname = FMT_LVM1_ORPHAN_VG_NAME;
  67         unsigned exported = 0;
  68
  69         munge_pvd(dev, pvd);
  70
  71         if (*pvd->vg_name) {
  72                 if (!read_vgd(dev, &vgd, pvd))
  73                         return_0;
  74                 vgid = (char *) vgd.vg_uuid;
  75                 vgname = (char *) pvd->vg_name;
  76                 exported = pvd->pv_status & VG_EXPORTED;
  77         }
  78
  79         if (!(info = lvmcache_add(l, (char *)pvd->pv_uuid, dev, vgname, vgid,
  80                                   exported)))
  81                 return_0;
  82         *label = info->label;
  83
  84         info->device_size = xlate32(pvd->pv_size) << SECTOR_SHIFT;
  85         dm_list_init(&info->mdas);
  86
  87         info->status &= ~CACHE_INVALID;
  88
  89         return 1;
  90 }
  91
  92 static int _lvm1_initialise_label(struct labeller *l __attribute((unused)), struct label *label)
  93 {
  94         strcpy(label->type, "LVM1");
  95
  96         return 1;
  97 }
  98
  99 static void _lvm1_destroy_label(struct labeller *l __attribute((unused)), struct label *label __attribute((unused)))
 100 {
 101         return;
 102 }
 103
 104 static void _lvm1_destroy(struct labeller *l)
 105 {
 106         dm_free(l);
 107 }
 108
 109 struct label_ops _lvm1_ops = {
 110         .can_handle = _lvm1_can_handle,
 111         .write = _lvm1_write,
 112         .read = _lvm1_read,
 113         .verify = _lvm1_can_handle,
 114         .initialise_label = _lvm1_initialise_label,
 115         .destroy_label = _lvm1_destroy_label,
 116         .destroy = _lvm1_destroy,
 117 };
 118
 119 struct labeller *lvm1_labeller_create(struct format_type *fmt)
 120 {
 121         struct labeller *l;
 122
 123         if (!(l = dm_malloc(sizeof(*l)))) {
 124                 log_error("Couldn't allocate labeller object.");
 125                 return NULL;
 126         }
 127
 128         l->ops = &_lvm1_ops;
 129         l->private = (const void *) fmt;
 130
 131         return l;
 132 }