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9194610f42
Flags are set on the initial I/O and passed to any callbacks that may in turn issue further I/O using the inherited flags.
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "lib.h"
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#include "lvm1-label.h"
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#include "disk-rep.h"
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#include "label.h"
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#include "metadata.h"
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#include "xlate.h"
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#include "format1.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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static void _not_supported(const char *op)
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{
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log_error("The '%s' operation is not supported for the lvm1 labeller.",
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op);
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}
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static int _lvm1_can_handle(struct labeller *l __attribute__((unused)), void *buf, uint64_t sector)
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{
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struct pv_disk *pvd = (struct pv_disk *) buf;
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uint32_t version;
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/* LVM1 label must always be in first sector */
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if (sector)
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return 0;
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version = xlate16(pvd->version);
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if (pvd->id[0] == 'H' && pvd->id[1] == 'M' &&
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(version == 1 || version == 2))
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return 1;
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return 0;
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}
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static int _lvm1_write(struct label *label __attribute__((unused)), void *buf __attribute__((unused)))
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{
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_not_supported("write");
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return 0;
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}
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static int _lvm1_read(struct labeller *l, struct device *dev, void *buf, unsigned ioflags,
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lvm_callback_fn_t read_label_callback_fn, void *read_label_callback_context)
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{
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struct pv_disk *pvd = (struct pv_disk *) buf;
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struct vg_disk vgd;
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struct lvmcache_info *info;
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struct label *label;
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const char *vgid = FMT_LVM1_ORPHAN_VG_NAME;
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const char *vgname = FMT_LVM1_ORPHAN_VG_NAME;
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unsigned exported = 0;
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int r = 0;
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munge_pvd(dev, pvd);
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if (*pvd->vg_name) {
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if (!read_vgd(dev, &vgd, pvd))
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return_0;
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vgid = (char *) vgd.vg_uuid;
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vgname = (char *) pvd->vg_name;
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exported = pvd->pv_status & VG_EXPORTED;
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}
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if (!(info = lvmcache_add(l, (char *)pvd->pv_uuid, dev, vgname, vgid,
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exported)))
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goto_out;
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label = lvmcache_get_label(info);
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lvmcache_set_device_size(info, ((uint64_t)xlate32(pvd->pv_size)) << SECTOR_SHIFT);
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lvmcache_set_ext_version(info, 0);
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lvmcache_set_ext_flags(info, 0);
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lvmcache_del_mdas(info);
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lvmcache_del_bas(info);
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lvmcache_make_valid(info);
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r = 1;
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out:
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if (read_label_callback_fn)
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read_label_callback_fn(!r, 0, read_label_callback_context, label);
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return r;
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}
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static int _lvm1_initialise_label(struct labeller *l __attribute__((unused)), struct label *label)
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{
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strcpy(label->type, "LVM1");
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return 1;
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}
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static void _lvm1_destroy_label(struct labeller *l __attribute__((unused)), struct label *label __attribute__((unused)))
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{
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}
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static void _lvm1_destroy(struct labeller *l)
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{
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dm_free(l);
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}
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struct label_ops _lvm1_ops = {
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.can_handle = _lvm1_can_handle,
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.write = _lvm1_write,
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.read = _lvm1_read,
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.initialise_label = _lvm1_initialise_label,
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.destroy_label = _lvm1_destroy_label,
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.destroy = _lvm1_destroy,
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};
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struct labeller *lvm1_labeller_create(struct format_type *fmt)
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{
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struct labeller *l;
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if (!(l = dm_malloc(sizeof(*l)))) {
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log_error("Couldn't allocate labeller object.");
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return NULL;
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}
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l->ops = &_lvm1_ops;
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l->fmt = fmt;
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return l;
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}
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