mirror of
git://sourceware.org/git/lvm2.git
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291 lines
6.8 KiB
C
291 lines
6.8 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004 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 General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "format-text.h"
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#include "layout.h"
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#include "label.h"
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#include "xlate.h"
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#include "lvmcache.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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static int _can_handle(struct labeller *l, char *buf, uint64_t sector)
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{
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struct label_header *lh = (struct label_header *) buf;
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if (!strncmp(lh->type, LVM2_LABEL, sizeof(lh->type)))
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return 1;
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return 0;
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}
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static int _write(struct label *label, char *buf)
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{
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struct label_header *lh = (struct label_header *) buf;
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struct pv_header *pvhdr;
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struct lvmcache_info *info;
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struct disk_locn *pvh_dlocn_xl;
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struct list *mdash, *dash;
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struct metadata_area *mda;
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struct mda_context *mdac;
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struct data_area_list *da;
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/* FIXME Move to where label is created */
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strncpy(label->type, LVM2_LABEL, sizeof(label->type));
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strncpy(lh->type, label->type, sizeof(label->type));
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pvhdr = (struct pv_header *) ((void *) buf + xlate32(lh->offset_xl));
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info = (struct lvmcache_info *) label->info;
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pvhdr->device_size_xl = xlate64(info->device_size);
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memcpy(pvhdr->pv_uuid, &info->dev->pvid, sizeof(struct id));
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pvh_dlocn_xl = &pvhdr->disk_areas_xl[0];
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/* List of data areas (holding PEs) */
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list_iterate(dash, &info->das) {
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da = list_item(dash, struct data_area_list);
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pvh_dlocn_xl->offset = xlate64(da->disk_locn.offset);
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pvh_dlocn_xl->size = xlate64(da->disk_locn.size);
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pvh_dlocn_xl++;
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}
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/* NULL-termination */
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pvh_dlocn_xl->offset = xlate64(UINT64_C(0));
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pvh_dlocn_xl->size = xlate64(UINT64_C(0));
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pvh_dlocn_xl++;
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/* List of metadata area header locations */
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list_iterate(mdash, &info->mdas) {
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mda = list_item(mdash, struct metadata_area);
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mdac = (struct mda_context *) mda->metadata_locn;
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if (mdac->area.dev != info->dev)
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continue;
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pvh_dlocn_xl->offset = xlate64(mdac->area.start);
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pvh_dlocn_xl->size = xlate64(mdac->area.size);
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pvh_dlocn_xl++;
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}
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/* NULL-termination */
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pvh_dlocn_xl->offset = xlate64(UINT64_C(0));
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pvh_dlocn_xl->size = xlate64(UINT64_C(0));
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return 1;
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}
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int add_da(const struct format_type *fmt, struct pool *mem, struct list *das,
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uint64_t start, uint64_t size)
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{
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struct data_area_list *dal;
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if (!mem) {
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if (!(dal = dbg_malloc(sizeof(*dal)))) {
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log_error("struct data_area_list allocation failed");
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return 0;
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}
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} else {
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if (!(dal = pool_alloc(mem, sizeof(*dal)))) {
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log_error("struct data_area_list allocation failed");
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return 0;
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}
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}
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dal->disk_locn.offset = start;
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dal->disk_locn.size = size;
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list_add(das, &dal->list);
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return 1;
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}
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void del_das(struct list *das)
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{
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struct list *dah, *tmp;
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struct data_area_list *da;
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list_iterate_safe(dah, tmp, das) {
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da = list_item(dah, struct data_area_list);
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list_del(&da->list);
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dbg_free(da);
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}
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}
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int add_mda(const struct format_type *fmt, struct pool *mem, struct list *mdas,
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struct device *dev, uint64_t start, uint64_t size)
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{
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/* FIXME List size restricted by pv_header SECTOR_SIZE */
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struct metadata_area *mdal;
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struct mda_lists *mda_lists = (struct mda_lists *) fmt->private;
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struct mda_context *mdac;
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if (!mem) {
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if (!(mdal = dbg_malloc(sizeof(struct metadata_area)))) {
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log_error("struct mda_list allocation failed");
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return 0;
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}
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if (!(mdac = dbg_malloc(sizeof(struct mda_context)))) {
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log_error("struct mda_context allocation failed");
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dbg_free(mdal);
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return 0;
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}
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} else {
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if (!(mdal = pool_alloc(mem, sizeof(struct metadata_area)))) {
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log_error("struct mda_list allocation failed");
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return 0;
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}
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if (!(mdac = pool_alloc(mem, sizeof(struct mda_context)))) {
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log_error("struct mda_context allocation failed");
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return 0;
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}
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}
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mdal->ops = mda_lists->raw_ops;
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mdal->metadata_locn = mdac;
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mdac->area.dev = dev;
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mdac->area.start = start;
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mdac->area.size = size;
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memset(&mdac->rlocn, 0, sizeof(mdac->rlocn));
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list_add(mdas, &mdal->list);
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return 1;
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}
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void del_mdas(struct list *mdas)
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{
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struct list *mdah, *tmp;
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struct metadata_area *mda;
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list_iterate_safe(mdah, tmp, mdas) {
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mda = list_item(mdah, struct metadata_area);
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dbg_free(mda->metadata_locn);
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list_del(&mda->list);
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dbg_free(mda);
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}
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}
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static int _initialise_label(struct labeller *l, struct label *label)
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{
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strncpy(label->type, LVM2_LABEL, sizeof(label->type));
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return 1;
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}
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static int _read(struct labeller *l, struct device *dev, char *buf,
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struct label **label)
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{
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struct label_header *lh = (struct label_header *) buf;
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struct pv_header *pvhdr;
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struct lvmcache_info *info;
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struct disk_locn *dlocn_xl;
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uint64_t offset;
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struct list *mdah;
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struct metadata_area *mda;
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char vgnamebuf[NAME_LEN + 2];
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struct mda_context *mdac;
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pvhdr = (struct pv_header *) ((void *) buf + xlate32(lh->offset_xl));
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if (!(info = lvmcache_add(l, pvhdr->pv_uuid, dev, NULL, NULL)))
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return 0;
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*label = info->label;
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info->device_size = xlate64(pvhdr->device_size_xl);
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if (info->das.n)
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del_das(&info->das);
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list_init(&info->das);
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if (info->mdas.n)
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del_mdas(&info->mdas);
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list_init(&info->mdas);
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/* Data areas holding the PEs */
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dlocn_xl = pvhdr->disk_areas_xl;
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while ((offset = xlate64(dlocn_xl->offset))) {
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add_da(info->fmt, NULL, &info->das, offset,
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xlate64(dlocn_xl->size));
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dlocn_xl++;
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}
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/* Metadata area headers */
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dlocn_xl++;
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while ((offset = xlate64(dlocn_xl->offset))) {
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add_mda(info->fmt, NULL, &info->mdas, dev, offset,
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xlate64(dlocn_xl->size));
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dlocn_xl++;
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}
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list_iterate(mdah, &info->mdas) {
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mda = list_item(mdah, struct metadata_area);
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mdac = (struct mda_context *) mda->metadata_locn;
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if (vgname_from_mda(info->fmt, &mdac->area, vgnamebuf,
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sizeof(vgnamebuf))) {
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lvmcache_update_vgname(info, vgnamebuf);
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}
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}
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info->status &= ~CACHE_INVALID;
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return 1;
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}
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static void _destroy_label(struct labeller *l, struct label *label)
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{
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struct lvmcache_info *info = (struct lvmcache_info *) label->info;
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if (info->mdas.n)
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del_mdas(&info->mdas);
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if (info->das.n)
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del_das(&info->das);
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}
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static void _destroy(struct labeller *l)
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{
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dbg_free(l);
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}
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struct label_ops _text_ops = {
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can_handle:_can_handle,
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write:_write,
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read:_read,
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verify:_can_handle,
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initialise_label:_initialise_label,
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destroy_label:_destroy_label,
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destroy:_destroy
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};
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struct labeller *text_labeller_create(const struct format_type *fmt)
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{
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struct labeller *l;
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if (!(l = dbg_malloc(sizeof(*l)))) {
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log_err("Couldn't allocate labeller object.");
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return NULL;
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}
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l->ops = &_text_ops;
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l->private = (const void *) fmt;
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return l;
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}
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