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git://sourceware.org/git/lvm2.git
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d591d04103
Mark the first metadata area on each text format PV as MDA_PRIMARY. Pass this information down to the device layer so that when there are two metadata areas on a block device, we can easily distinguish two independent streams of I/O.
496 lines
12 KiB
C
496 lines
12 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 "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 _text_can_handle(struct labeller *l __attribute__((unused)),
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void *buf,
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uint64_t sector __attribute__((unused)))
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{
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struct label_header *lh = (struct label_header *) buf;
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if (!strncmp((char *)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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struct _dl_setup_baton {
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struct disk_locn *pvh_dlocn_xl;
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struct device *dev;
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};
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static int _da_setup(struct disk_locn *da, void *baton)
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{
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struct _dl_setup_baton *p = baton;
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p->pvh_dlocn_xl->offset = xlate64(da->offset);
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p->pvh_dlocn_xl->size = xlate64(da->size);
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p->pvh_dlocn_xl++;
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return 1;
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}
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static int _ba_setup(struct disk_locn *ba, void *baton)
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{
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return _da_setup(ba, baton);
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}
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static int _mda_setup(struct metadata_area *mda, void *baton)
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{
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struct _dl_setup_baton *p = baton;
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struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
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if (mdac->area.dev != p->dev)
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return 1;
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p->pvh_dlocn_xl->offset = xlate64(mdac->area.start);
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p->pvh_dlocn_xl->size = xlate64(mdac->area.size);
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p->pvh_dlocn_xl++;
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return 1;
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}
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static int _dl_null_termination(void *baton)
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{
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struct _dl_setup_baton *p = baton;
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p->pvh_dlocn_xl->offset = xlate64(UINT64_C(0));
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p->pvh_dlocn_xl->size = xlate64(UINT64_C(0));
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p->pvh_dlocn_xl++;
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return 1;
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}
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static int _text_write(struct label *label, void *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 pv_header_extension *pvhdr_ext;
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struct lvmcache_info *info;
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struct _dl_setup_baton baton;
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char buffer[64] __attribute__((aligned(8)));
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int ba1, da1, mda1, mda2;
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/*
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* PV header base
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*/
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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((char *)lh->type, label->type, sizeof(label->type));
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pvhdr = (struct pv_header *) ((char *) buf + xlate32(lh->offset_xl));
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info = (struct lvmcache_info *) label->info;
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pvhdr->device_size_xl = xlate64(lvmcache_device_size(info));
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memcpy(pvhdr->pv_uuid, &lvmcache_device(info)->pvid, sizeof(struct id));
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if (!id_write_format((const struct id *)pvhdr->pv_uuid, buffer,
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sizeof(buffer))) {
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stack;
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buffer[0] = '\0';
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}
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baton.dev = lvmcache_device(info);
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baton.pvh_dlocn_xl = &pvhdr->disk_areas_xl[0];
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/* List of data areas (holding PEs) */
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lvmcache_foreach_da(info, _da_setup, &baton);
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_dl_null_termination(&baton);
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/* List of metadata area header locations */
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lvmcache_foreach_mda(info, _mda_setup, &baton);
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_dl_null_termination(&baton);
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/*
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* PV header extension
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*/
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pvhdr_ext = (struct pv_header_extension *) ((char *) baton.pvh_dlocn_xl);
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pvhdr_ext->version = xlate32(PV_HEADER_EXTENSION_VSN);
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pvhdr_ext->flags = xlate32(lvmcache_ext_flags(info));
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/* List of bootloader area locations */
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baton.pvh_dlocn_xl = &pvhdr_ext->bootloader_areas_xl[0];
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lvmcache_foreach_ba(info, _ba_setup, &baton);
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_dl_null_termination(&baton);
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/* Create debug message with ba, da and mda locations */
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ba1 = (xlate64(pvhdr_ext->bootloader_areas_xl[0].offset) ||
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xlate64(pvhdr_ext->bootloader_areas_xl[0].size)) ? 0 : -1;
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da1 = (xlate64(pvhdr->disk_areas_xl[0].offset) ||
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xlate64(pvhdr->disk_areas_xl[0].size)) ? 0 : -1;
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mda1 = da1 + 2;
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mda2 = mda1 + 1;
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if (!xlate64(pvhdr->disk_areas_xl[mda1].offset) &&
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!xlate64(pvhdr->disk_areas_xl[mda1].size))
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mda1 = mda2 = 0;
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else if (!xlate64(pvhdr->disk_areas_xl[mda2].offset) &&
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!xlate64(pvhdr->disk_areas_xl[mda2].size))
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mda2 = 0;
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log_debug_metadata("%s: Preparing PV label header %s size %" PRIu64 " with"
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"%s%.*" PRIu64 "%s%.*" PRIu64 "%s"
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"%s%.*" PRIu64 "%s%.*" PRIu64 "%s"
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"%s%.*" PRIu64 "%s%.*" PRIu64 "%s"
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"%s%.*" PRIu64 "%s%.*" PRIu64 "%s",
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dev_name(lvmcache_device(info)), buffer, lvmcache_device_size(info),
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(ba1 > -1) ? " ba1 (" : "",
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(ba1 > -1) ? 1 : 0,
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(ba1 > -1) ? xlate64(pvhdr_ext->bootloader_areas_xl[ba1].offset) >> SECTOR_SHIFT : 0,
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(ba1 > -1) ? "s, " : "",
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(ba1 > -1) ? 1 : 0,
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(ba1 > -1) ? xlate64(pvhdr_ext->bootloader_areas_xl[ba1].size) >> SECTOR_SHIFT : 0,
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(ba1 > -1) ? "s)" : "",
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(da1 > -1) ? " da1 (" : "",
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(da1 > -1) ? 1 : 0,
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(da1 > -1) ? xlate64(pvhdr->disk_areas_xl[da1].offset) >> SECTOR_SHIFT : 0,
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(da1 > -1) ? "s, " : "",
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(da1 > -1) ? 1 : 0,
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(da1 > -1) ? xlate64(pvhdr->disk_areas_xl[da1].size) >> SECTOR_SHIFT : 0,
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(da1 > -1) ? "s)" : "",
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mda1 ? " mda1 (" : "",
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mda1 ? 1 : 0,
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mda1 ? xlate64(pvhdr->disk_areas_xl[mda1].offset) >> SECTOR_SHIFT : 0,
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mda1 ? "s, " : "",
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mda1 ? 1 : 0,
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mda1 ? xlate64(pvhdr->disk_areas_xl[mda1].size) >> SECTOR_SHIFT : 0,
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mda1 ? "s)" : "",
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mda2 ? " mda2 (" : "",
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mda2 ? 1 : 0,
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mda2 ? xlate64(pvhdr->disk_areas_xl[mda2].offset) >> SECTOR_SHIFT : 0,
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mda2 ? "s, " : "",
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mda2 ? 1 : 0,
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mda2 ? xlate64(pvhdr->disk_areas_xl[mda2].size) >> SECTOR_SHIFT : 0,
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mda2 ? "s)" : "");
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if (da1 < 0) {
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log_error(INTERNAL_ERROR "%s label header currently requires "
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"a data area.", dev_name(lvmcache_device(info)));
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return 0;
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}
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return 1;
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}
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int add_da(struct dm_pool *mem, struct dm_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 = dm_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 = dm_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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dm_list_add(das, &dal->list);
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return 1;
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}
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void del_das(struct dm_list *das)
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{
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struct dm_list *dah, *tmp;
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struct data_area_list *da;
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dm_list_iterate_safe(dah, tmp, das) {
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da = dm_list_item(dah, struct data_area_list);
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dm_list_del(&da->list);
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dm_free(da);
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}
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}
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int add_ba(struct dm_pool *mem, struct dm_list *eas,
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uint64_t start, uint64_t size)
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{
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return add_da(mem, eas, start, size);
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}
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void del_bas(struct dm_list *bas)
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{
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del_das(bas);
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}
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/* FIXME: refactor this function with other mda constructor code */
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int add_mda(const struct format_type *fmt, struct dm_pool *mem, struct dm_list *mdas,
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struct device *dev, uint64_t start, uint64_t size, unsigned ignored)
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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, *mda;
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struct mda_lists *mda_lists = (struct mda_lists *) fmt->private;
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struct mda_context *mdac, *mdac2;
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if (!mem) {
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if (!(mdal = dm_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 = dm_malloc(sizeof(struct mda_context)))) {
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log_error("struct mda_context allocation failed");
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dm_free(mdal);
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return 0;
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}
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} else {
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if (!(mdal = dm_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 = dm_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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mdac->free_sectors = UINT64_C(0);
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memset(&mdac->rlocn, 0, sizeof(mdac->rlocn));
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/* Set MDA_PRIMARY only if this is the first metadata area on this device. */
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mdal->status = MDA_PRIMARY;
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dm_list_iterate_items(mda, mdas) {
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mdac2 = mda->metadata_locn;
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if (mdac2->area.dev == dev) {
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mdal->status = 0;
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break;
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}
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}
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mda_set_ignored(mdal, ignored);
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dm_list_add(mdas, &mdal->list);
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return 1;
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}
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void del_mdas(struct dm_list *mdas)
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{
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struct dm_list *mdah, *tmp;
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struct metadata_area *mda;
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dm_list_iterate_safe(mdah, tmp, mdas) {
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mda = dm_list_item(mdah, struct metadata_area);
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dm_free(mda->metadata_locn);
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dm_list_del(&mda->list);
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dm_free(mda);
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}
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}
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static int _text_initialise_label(struct labeller *l __attribute__((unused)),
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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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struct _update_mda_baton {
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struct lvmcache_info *info;
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struct label *label;
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};
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static int _update_mda(struct metadata_area *mda, void *baton)
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{
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struct _update_mda_baton *p = baton;
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const struct format_type *fmt = p->label->labeller->fmt;
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struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
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struct mda_header *mdah;
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struct lvmcache_vgsummary vgsummary = { 0 };
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/*
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* Using the labeller struct to preserve info about
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* the last parsed vgname, vgid, creation host
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*
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* TODO: make lvmcache smarter and move this cache logic there
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*/
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if (!dev_open_readonly(mdac->area.dev)) {
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mda_set_ignored(mda, 1);
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stack;
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return 1;
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}
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if (!(mdah = raw_read_mda_header(fmt, &mdac->area, mda_is_primary(mda)))) {
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stack;
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goto close_dev;
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}
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mda_set_ignored(mda, rlocn_is_ignored(mdah->raw_locns));
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if (mda_is_ignored(mda)) {
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log_debug_metadata("Ignoring mda on device %s at offset %"PRIu64,
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dev_name(mdac->area.dev),
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mdac->area.start);
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if (!dev_close(mdac->area.dev))
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stack;
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return 1;
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}
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if (vgname_from_mda(fmt, mdah, mda_is_primary(mda), &mdac->area, &vgsummary,
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&mdac->free_sectors) &&
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!lvmcache_update_vgname_and_id(p->info, &vgsummary)) {
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if (!dev_close(mdac->area.dev))
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stack;
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return_0;
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}
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close_dev:
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if (!dev_close(mdac->area.dev))
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stack;
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return 1;
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}
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static int _text_read(struct labeller *l, struct device *dev, void *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 pv_header_extension *pvhdr_ext;
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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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uint32_t ext_version;
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struct _update_mda_baton baton;
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/*
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* PV header base
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*/
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pvhdr = (struct pv_header *) ((char *) buf + xlate32(lh->offset_xl));
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if (!(info = lvmcache_add(l, (char *)pvhdr->pv_uuid, dev,
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FMT_TEXT_ORPHAN_VG_NAME,
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FMT_TEXT_ORPHAN_VG_NAME, 0)))
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return_0;
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*label = lvmcache_get_label(info);
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lvmcache_set_device_size(info, xlate64(pvhdr->device_size_xl));
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lvmcache_del_das(info);
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lvmcache_del_mdas(info);
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lvmcache_del_bas(info);
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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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lvmcache_add_da(info, offset, 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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lvmcache_add_mda(info, dev, offset, xlate64(dlocn_xl->size), 0);
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dlocn_xl++;
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}
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dlocn_xl++;
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/*
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* PV header extension
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*/
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pvhdr_ext = (struct pv_header_extension *) ((char *) dlocn_xl);
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if (!(ext_version = xlate32(pvhdr_ext->version)))
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goto out;
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log_debug_metadata("%s: PV header extension version %" PRIu32 " found",
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dev_name(dev), ext_version);
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/* Extension version */
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lvmcache_set_ext_version(info, xlate32(pvhdr_ext->version));
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/* Extension flags */
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lvmcache_set_ext_flags(info, xlate32(pvhdr_ext->flags));
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/* Bootloader areas */
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dlocn_xl = pvhdr_ext->bootloader_areas_xl;
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while ((offset = xlate64(dlocn_xl->offset))) {
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lvmcache_add_ba(info, offset, xlate64(dlocn_xl->size));
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dlocn_xl++;
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}
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out:
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baton.info = info;
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baton.label = *label;
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if (!lvmcache_foreach_mda(info, _update_mda, &baton))
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return_0;
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lvmcache_make_valid(info);
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return 1;
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}
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static void _text_destroy_label(struct labeller *l __attribute__((unused)),
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struct label *label)
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{
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struct lvmcache_info *info = (struct lvmcache_info *) label->info;
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lvmcache_del_mdas(info);
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lvmcache_del_das(info);
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lvmcache_del_bas(info);
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}
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static void _fmt_text_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 _text_ops = {
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.can_handle = _text_can_handle,
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.write = _text_write,
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.read = _text_read,
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.initialise_label = _text_initialise_label,
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.destroy_label = _text_destroy_label,
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.destroy = _fmt_text_destroy,
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};
|
|
|
|
struct labeller *text_labeller_create(const struct format_type *fmt)
|
|
{
|
|
struct labeller *l;
|
|
|
|
if (!(l = dm_zalloc(sizeof(*l)))) {
|
|
log_error("Couldn't allocate labeller object.");
|
|
return NULL;
|
|
}
|
|
|
|
l->ops = &_text_ops;
|
|
l->fmt = fmt;
|
|
|
|
return l;
|
|
}
|