mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
1051 lines
24 KiB
C
1051 lines
24 KiB
C
/*
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* Copyright (C) 2001-2004 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 "pool.h"
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#include "device.h"
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#include "metadata.h"
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#include "toolcontext.h"
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#include "lvm-string.h"
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#include "lvmcache.h"
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#include "memlock.h"
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static int _add_pv_to_vg(struct format_instance *fid, struct volume_group *vg,
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const char *pv_name)
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{
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struct pv_list *pvl;
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struct physical_volume *pv;
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struct pool *mem = fid->fmt->cmd->mem;
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struct list mdas;
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log_verbose("Adding physical volume '%s' to volume group '%s'",
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pv_name, vg->name);
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if (!(pvl = pool_zalloc(mem, sizeof(*pvl)))) {
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log_error("pv_list allocation for '%s' failed", pv_name);
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return 0;
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}
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list_init(&mdas);
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if (!(pv = pv_read(fid->fmt->cmd, pv_name, &mdas, NULL, 1))) {
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log_error("%s not identified as an existing physical volume",
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pv_name);
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return 0;
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}
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if (*pv->vg_name) {
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log_error("Physical volume '%s' is already in volume group "
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"'%s'", pv_name, pv->vg_name);
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return 0;
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}
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if (pv->fmt != fid->fmt) {
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log_error("Physical volume %s is of different format type (%s)",
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pv_name, pv->fmt->name);
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return 0;
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}
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if (!(pv->vg_name = pool_strdup(mem, vg->name))) {
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log_error("vg->name allocation failed for '%s'", pv_name);
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return 0;
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}
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/* Units of 512-byte sectors */
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pv->pe_size = vg->extent_size;
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/* FIXME Do proper rounding-up alignment? */
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/* Reserved space for label; this holds 0 for PVs created by LVM1 */
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if (pv->pe_start < PE_ALIGN)
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pv->pe_start = PE_ALIGN;
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/*
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* The next two fields should be corrected
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* by fid->pv_setup.
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*/
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pv->pe_count = (pv->size - pv->pe_start) / vg->extent_size;
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pv->pe_alloc_count = 0;
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if (!fid->fmt->ops->pv_setup(fid->fmt, UINT64_C(0), 0,
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vg->extent_size, 0, UINT64_C(0),
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&fid->metadata_areas, pv, vg)) {
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log_error("Format-specific setup of physical volume '%s' "
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"failed.", pv_name);
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return 0;
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}
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if (find_pv_in_vg(vg, pv_name)) {
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log_error("Physical volume '%s' listed more than once.",
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pv_name);
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return 0;
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}
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if (vg->pv_count && (vg->pv_count == vg->max_pv)) {
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log_error("No space for '%s' - volume group '%s' "
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"holds max %d physical volume(s).", pv_name,
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vg->name, vg->max_pv);
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return 0;
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}
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pvl->pv = pv;
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list_add(&vg->pvs, &pvl->list);
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vg->pv_count++;
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vg->extent_count += pv->pe_count;
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vg->free_count += pv->pe_count;
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return 1;
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}
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int vg_rename(struct cmd_context *cmd, struct volume_group *vg,
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const char *new_name)
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{
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struct pool *mem = cmd->mem;
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struct physical_volume *pv;
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struct list *pvh;
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if (!(vg->name = pool_strdup(mem, new_name))) {
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log_error("vg->name allocation failed for '%s'", new_name);
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return 0;
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}
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list_iterate(pvh, &vg->pvs) {
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pv = list_item(pvh, struct pv_list)->pv;
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if (!(pv->vg_name = pool_strdup(mem, new_name))) {
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log_error("pv->vg_name allocation failed for '%s'",
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dev_name(pv->dev));
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return 0;
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}
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}
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return 1;
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}
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int vg_extend(struct format_instance *fid,
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struct volume_group *vg, int pv_count, char **pv_names)
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{
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int i;
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/* attach each pv */
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for (i = 0; i < pv_count; i++)
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if (!_add_pv_to_vg(fid, vg, pv_names[i])) {
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log_error("Unable to add physical volume '%s' to "
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"volume group '%s'.", pv_names[i], vg->name);
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return 0;
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}
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/* FIXME Decide whether to initialise and add new mdahs to format instance */
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return 1;
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}
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const char *strip_dir(const char *vg_name, const char *dev_dir)
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{
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size_t len = strlen(dev_dir);
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if (!strncmp(vg_name, dev_dir, len))
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vg_name += len;
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return vg_name;
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}
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struct volume_group *vg_create(struct cmd_context *cmd, const char *vg_name,
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uint32_t extent_size, uint32_t max_pv,
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uint32_t max_lv, alloc_policy_t alloc,
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int pv_count, char **pv_names)
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{
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struct volume_group *vg;
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struct pool *mem = cmd->mem;
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int consistent = 0;
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int old_partial;
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if (!(vg = pool_zalloc(mem, sizeof(*vg)))) {
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stack;
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return NULL;
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}
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/* is this vg name already in use ? */
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old_partial = partial_mode();
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init_partial(1);
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if (vg_read(cmd, vg_name, &consistent)) {
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log_err("A volume group called '%s' already exists.", vg_name);
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goto bad;
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}
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init_partial(old_partial);
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if (!id_create(&vg->id)) {
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log_err("Couldn't create uuid for volume group '%s'.", vg_name);
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goto bad;
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}
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/* Strip dev_dir if present */
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vg_name = strip_dir(vg_name, cmd->dev_dir);
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vg->cmd = cmd;
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if (!(vg->name = pool_strdup(mem, vg_name))) {
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stack;
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goto bad;
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}
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vg->seqno = 0;
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vg->status = (RESIZEABLE_VG | LVM_READ | LVM_WRITE);
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vg->system_id = pool_alloc(mem, NAME_LEN);
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*vg->system_id = '\0';
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vg->extent_size = extent_size;
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vg->extent_count = 0;
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vg->free_count = 0;
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vg->max_lv = max_lv;
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vg->max_pv = max_pv;
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vg->alloc = alloc;
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vg->pv_count = 0;
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list_init(&vg->pvs);
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vg->lv_count = 0;
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list_init(&vg->lvs);
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vg->snapshot_count = 0;
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list_init(&vg->snapshots);
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list_init(&vg->tags);
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if (!(vg->fid = cmd->fmt->ops->create_instance(cmd->fmt, vg_name,
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NULL))) {
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log_error("Failed to create format instance");
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goto bad;
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}
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if (vg->fid->fmt->ops->vg_setup &&
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!vg->fid->fmt->ops->vg_setup(vg->fid, vg)) {
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log_error("Format specific setup of volume group '%s' failed.",
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vg_name);
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goto bad;
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}
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/* attach the pv's */
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if (!vg_extend(vg->fid, vg, pv_count, pv_names))
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goto bad;
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return vg;
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bad:
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pool_free(mem, vg);
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return NULL;
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}
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/* Sizes in sectors */
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struct physical_volume *pv_create(const struct format_type *fmt,
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struct device *dev,
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struct id *id, uint64_t size,
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uint64_t pe_start,
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uint32_t existing_extent_count,
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uint32_t existing_extent_size,
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int pvmetadatacopies,
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uint64_t pvmetadatasize, struct list *mdas)
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{
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struct pool *mem = fmt->cmd->mem;
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struct physical_volume *pv = pool_alloc(mem, sizeof(*pv));
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if (!pv) {
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stack;
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return NULL;
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}
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if (id)
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memcpy(&pv->id, id, sizeof(*id));
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else if (!id_create(&pv->id)) {
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log_error("Failed to create random uuid for %s.",
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dev_name(dev));
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return NULL;
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}
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pv->dev = dev;
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if (!(pv->vg_name = pool_zalloc(mem, NAME_LEN))) {
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stack;
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goto bad;
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}
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pv->status = ALLOCATABLE_PV;
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if (!dev_get_size(pv->dev, &pv->size)) {
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log_error("%s: Couldn't get size.", dev_name(pv->dev));
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goto bad;
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}
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if (size) {
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if (size > pv->size)
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log_print("WARNING: %s: Overriding real size. "
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"You could lose data.", dev_name(pv->dev));
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log_verbose("%s: Pretending size is %" PRIu64 " sectors.",
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dev_name(pv->dev), size);
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pv->size = size;
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}
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if (pv->size < PV_MIN_SIZE) {
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log_error("%s: Size must exceed minimum of %ld sectors.",
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dev_name(pv->dev), PV_MIN_SIZE);
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goto bad;
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}
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pv->pe_size = 0;
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pv->pe_start = 0;
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pv->pe_count = 0;
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pv->pe_alloc_count = 0;
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pv->fmt = fmt;
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list_init(&pv->tags);
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if (!fmt->ops->pv_setup(fmt, pe_start, existing_extent_count,
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existing_extent_size,
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pvmetadatacopies, pvmetadatasize, mdas,
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pv, NULL)) {
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log_error("%s: Format-specific setup of physical volume "
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"failed.", dev_name(pv->dev));
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goto bad;
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}
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return pv;
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bad:
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pool_free(mem, pv);
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return NULL;
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}
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struct pv_list *find_pv_in_vg(struct volume_group *vg, const char *pv_name)
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{
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struct list *pvh;
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struct pv_list *pvl;
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list_iterate(pvh, &vg->pvs) {
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pvl = list_item(pvh, struct pv_list);
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if (pvl->pv->dev == dev_cache_get(pv_name, vg->cmd->filter))
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return pvl;
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}
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return NULL;
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}
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int pv_is_in_vg(struct volume_group *vg, struct physical_volume *pv)
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{
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struct list *pvh;
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list_iterate(pvh, &vg->pvs) {
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if (pv == list_item(pvh, struct pv_list)->pv)
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return 1;
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}
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return 0;
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}
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struct physical_volume *find_pv_in_vg_by_uuid(struct volume_group *vg,
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struct id *id)
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{
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struct list *pvh;
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struct pv_list *pvl;
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list_iterate(pvh, &vg->pvs) {
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pvl = list_item(pvh, struct pv_list);
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if (id_equal(&pvl->pv->id, id))
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return pvl->pv;
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}
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return NULL;
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}
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struct lv_list *find_lv_in_vg(struct volume_group *vg, const char *lv_name)
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{
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struct list *lvh;
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struct lv_list *lvl;
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const char *ptr;
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/* Use last component */
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if ((ptr = strrchr(lv_name, '/')))
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ptr++;
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else
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ptr = lv_name;
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list_iterate(lvh, &vg->lvs) {
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lvl = list_item(lvh, struct lv_list);
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if (!strcmp(lvl->lv->name, ptr))
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return lvl;
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}
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return NULL;
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}
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struct lv_list *find_lv_in_vg_by_lvid(struct volume_group *vg,
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const union lvid *lvid)
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{
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struct list *lvh;
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struct lv_list *lvl;
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list_iterate(lvh, &vg->lvs) {
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lvl = list_item(lvh, struct lv_list);
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if (!strncmp(lvl->lv->lvid.s, lvid->s, sizeof(*lvid)))
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return lvl;
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}
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return NULL;
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}
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struct logical_volume *find_lv(struct volume_group *vg, const char *lv_name)
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{
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struct lv_list *lvl = find_lv_in_vg(vg, lv_name);
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return lvl ? lvl->lv : NULL;
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}
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struct physical_volume *find_pv(struct volume_group *vg, struct device *dev)
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{
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struct list *pvh;
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struct physical_volume *pv;
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list_iterate(pvh, &vg->pvs) {
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pv = list_item(pvh, struct pv_list)->pv;
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if (dev == pv->dev)
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return pv;
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}
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return NULL;
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}
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struct physical_volume *find_pv_by_name(struct cmd_context *cmd,
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const char *pv_name)
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{
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struct physical_volume *pv;
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if (!(pv = pv_read(cmd, pv_name, NULL, NULL, 1))) {
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log_error("Physical volume %s not found", pv_name);
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return NULL;
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}
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if (!pv->vg_name[0]) {
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log_error("Physical volume %s not in a volume group", pv_name);
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return NULL;
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}
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return pv;
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}
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/* Find segment at a given logical extent in an LV */
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struct lv_segment *find_seg_by_le(struct logical_volume *lv, uint32_t le)
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{
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struct list *segh;
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struct lv_segment *seg;
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list_iterate(segh, &lv->segments) {
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seg = list_item(segh, struct lv_segment);
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if (le >= seg->le && le < seg->le + seg->len)
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return seg;
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}
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return NULL;
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}
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int vg_remove(struct volume_group *vg)
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{
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struct list *mdah;
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struct metadata_area *mda;
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/* FIXME Improve recovery situation? */
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/* Remove each copy of the metadata */
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list_iterate(mdah, &vg->fid->metadata_areas) {
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mda = list_item(mdah, struct metadata_area);
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if (mda->ops->vg_remove &&
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!mda->ops->vg_remove(vg->fid, vg, mda)) {
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stack;
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return 0;
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}
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}
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return 1;
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}
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|
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/*
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* After vg_write() returns success,
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* caller MUST call either vg_commit() or vg_revert()
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*/
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int vg_write(struct volume_group *vg)
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{
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struct list *mdah, *mdah2;
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struct metadata_area *mda;
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if (vg->status & PARTIAL_VG) {
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log_error("Cannot change metadata for partial volume group %s",
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vg->name);
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return 0;
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}
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if (list_empty(&vg->fid->metadata_areas)) {
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log_error("Aborting vg_write: No metadata areas to write to!");
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return 0;
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}
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vg->seqno++;
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|
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/* Write to each copy of the metadata area */
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list_iterate(mdah, &vg->fid->metadata_areas) {
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mda = list_item(mdah, struct metadata_area);
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if (!mda->ops->vg_write) {
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log_error("Format does not support writing volume"
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"group metadata areas");
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/* Revert */
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list_uniterate(mdah2, &vg->fid->metadata_areas, mdah) {
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mda = list_item(mdah2, struct metadata_area);
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if (mda->ops->vg_revert &&
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!mda->ops->vg_revert(vg->fid, vg, mda)) {
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stack;
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}
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}
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return 0;
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}
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if (!mda->ops->vg_write(vg->fid, vg, mda)) {
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stack;
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/* Revert */
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list_uniterate(mdah2, &vg->fid->metadata_areas, mdah) {
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mda = list_item(mdah2, struct metadata_area);
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if (mda->ops->vg_revert &&
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!mda->ops->vg_revert(vg->fid, vg, mda)) {
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stack;
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}
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}
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return 0;
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}
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}
|
|
|
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/* Now pre-commit each copy of the new metadata */
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list_iterate(mdah, &vg->fid->metadata_areas) {
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mda = list_item(mdah, struct metadata_area);
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if (mda->ops->vg_precommit &&
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!mda->ops->vg_precommit(vg->fid, vg, mda)) {
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stack;
|
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/* Revert */
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list_iterate(mdah2, &vg->fid->metadata_areas) {
|
|
mda = list_item(mdah2, struct metadata_area);
|
|
if (mda->ops->vg_revert &&
|
|
!mda->ops->vg_revert(vg->fid, vg, mda)) {
|
|
stack;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Commit pending changes */
|
|
int vg_commit(struct volume_group *vg)
|
|
{
|
|
struct list *mdah;
|
|
struct metadata_area *mda;
|
|
int cache_updated = 0;
|
|
int failed = 0;
|
|
|
|
/* Commit to each copy of the metadata area */
|
|
list_iterate(mdah, &vg->fid->metadata_areas) {
|
|
mda = list_item(mdah, struct metadata_area);
|
|
failed = 0;
|
|
if (mda->ops->vg_commit &&
|
|
!mda->ops->vg_commit(vg->fid, vg, mda)) {
|
|
stack;
|
|
failed = 1;
|
|
}
|
|
/* Update cache first time we succeed */
|
|
if (!failed && !cache_updated) {
|
|
lvmcache_update_vg(vg);
|
|
cache_updated = 1;
|
|
}
|
|
|
|
}
|
|
|
|
/* If at least one mda commit succeeded, it was committed */
|
|
return cache_updated;
|
|
}
|
|
|
|
/* Don't commit any pending changes */
|
|
int vg_revert(struct volume_group *vg)
|
|
{
|
|
struct list *mdah;
|
|
struct metadata_area *mda;
|
|
|
|
list_iterate(mdah, &vg->fid->metadata_areas) {
|
|
mda = list_item(mdah, struct metadata_area);
|
|
if (mda->ops->vg_revert &&
|
|
!mda->ops->vg_revert(vg->fid, vg, mda)) {
|
|
stack;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Make orphan PVs look like a VG */
|
|
static struct volume_group *_vg_read_orphans(struct cmd_context *cmd)
|
|
{
|
|
struct lvmcache_vginfo *vginfo;
|
|
struct list *ih;
|
|
struct device *dev;
|
|
struct pv_list *pvl;
|
|
struct volume_group *vg;
|
|
struct physical_volume *pv;
|
|
|
|
if (!(vginfo = vginfo_from_vgname(ORPHAN))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
if (!(vg = pool_zalloc(cmd->mem, sizeof(*vg)))) {
|
|
log_error("vg allocation failed");
|
|
return NULL;
|
|
}
|
|
list_init(&vg->pvs);
|
|
list_init(&vg->lvs);
|
|
list_init(&vg->snapshots);
|
|
list_init(&vg->tags);
|
|
vg->cmd = cmd;
|
|
if (!(vg->name = pool_strdup(cmd->mem, ORPHAN))) {
|
|
log_error("vg name allocation failed");
|
|
return NULL;
|
|
}
|
|
|
|
list_iterate(ih, &vginfo->infos) {
|
|
dev = list_item(ih, struct lvmcache_info)->dev;
|
|
if (!(pv = pv_read(cmd, dev_name(dev), NULL, NULL, 1))) {
|
|
continue;
|
|
}
|
|
if (!(pvl = pool_zalloc(cmd->mem, sizeof(*pvl)))) {
|
|
log_error("pv_list allocation failed");
|
|
return NULL;
|
|
}
|
|
pvl->pv = pv;
|
|
list_add(&vg->pvs, &pvl->list);
|
|
vg->pv_count++;
|
|
}
|
|
|
|
return vg;
|
|
}
|
|
|
|
/* Caller sets consistent to 1 if it's safe for vg_read to correct
|
|
* inconsistent metadata on disk (i.e. the VG write lock is held).
|
|
* This guarantees only consistent metadata is returned unless PARTIAL_VG.
|
|
* If consistent is 0, caller must check whether consistent == 1 on return
|
|
* and take appropriate action if it isn't (e.g. abort; get write lock
|
|
* and call vg_read again).
|
|
*/
|
|
static struct volume_group *_vg_read(struct cmd_context *cmd,
|
|
const char *vgname,
|
|
int *consistent, int precommitted)
|
|
{
|
|
struct format_instance *fid;
|
|
const struct format_type *fmt;
|
|
struct volume_group *vg, *correct_vg = NULL;
|
|
struct list *mdah;
|
|
struct metadata_area *mda;
|
|
int inconsistent = 0;
|
|
|
|
if (!*vgname) {
|
|
if (precommitted) {
|
|
log_error("Internal error: vg_read requires vgname "
|
|
"with pre-commit.");
|
|
return NULL;
|
|
}
|
|
*consistent = 1;
|
|
return _vg_read_orphans(cmd);
|
|
}
|
|
|
|
/* Find the vgname in the cache */
|
|
/* If it's not there we must do full scan to be completely sure */
|
|
if (!(fmt = fmt_from_vgname(vgname))) {
|
|
lvmcache_label_scan(cmd, 0);
|
|
if (!(fmt = fmt_from_vgname(vgname))) {
|
|
if (memlock()) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
lvmcache_label_scan(cmd, 2);
|
|
if (!(fmt = fmt_from_vgname(vgname))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (precommitted && !(fmt->features & FMT_PRECOMMIT)) {
|
|
log_error("Internal error: %s doesn't support "
|
|
"pre-commit", fmt->name);
|
|
return NULL;
|
|
}
|
|
|
|
/* create format instance with appropriate metadata area */
|
|
if (!(fid = fmt->ops->create_instance(fmt, vgname, NULL))) {
|
|
log_error("Failed to create format instance");
|
|
return NULL;
|
|
}
|
|
|
|
/* Ensure contents of all metadata areas match - else do recovery */
|
|
list_iterate(mdah, &fid->metadata_areas) {
|
|
mda = list_item(mdah, struct metadata_area);
|
|
if ((precommitted &&
|
|
!(vg = mda->ops->vg_read_precommit(fid, vgname, mda))) ||
|
|
(!precommitted &&
|
|
!(vg = mda->ops->vg_read(fid, vgname, mda)))) {
|
|
inconsistent = 1;
|
|
continue;
|
|
}
|
|
if (!correct_vg) {
|
|
correct_vg = vg;
|
|
continue;
|
|
}
|
|
/* FIXME Also ensure contents same - checksum compare? */
|
|
if (correct_vg->seqno != vg->seqno) {
|
|
inconsistent = 1;
|
|
if (vg->seqno > correct_vg->seqno)
|
|
correct_vg = vg;
|
|
}
|
|
}
|
|
|
|
/* Failed to find VG where we expected it - full scan and retry */
|
|
if (!correct_vg) {
|
|
inconsistent = 0;
|
|
|
|
lvmcache_label_scan(cmd, 2);
|
|
if (!(fmt = fmt_from_vgname(vgname))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
if (precommitted && !(fmt->features & FMT_PRECOMMIT)) {
|
|
log_error("Internal error: %s doesn't support "
|
|
"pre-commit", fmt->name);
|
|
return NULL;
|
|
}
|
|
|
|
/* create format instance with appropriate metadata area */
|
|
if (!(fid = fmt->ops->create_instance(fmt, vgname, NULL))) {
|
|
log_error("Failed to create format instance");
|
|
return NULL;
|
|
}
|
|
|
|
/* Ensure contents of all metadata areas match - else recover */
|
|
list_iterate(mdah, &fid->metadata_areas) {
|
|
mda = list_item(mdah, struct metadata_area);
|
|
if ((precommitted &&
|
|
!(vg = mda->ops->vg_read_precommit(fid, vgname,
|
|
mda))) ||
|
|
(!precommitted &&
|
|
!(vg = mda->ops->vg_read(fid, vgname, mda)))) {
|
|
inconsistent = 1;
|
|
continue;
|
|
}
|
|
if (!correct_vg) {
|
|
correct_vg = vg;
|
|
continue;
|
|
}
|
|
/* FIXME Also ensure contents same - checksums same? */
|
|
if (correct_vg->seqno != vg->seqno) {
|
|
inconsistent = 1;
|
|
if (vg->seqno > correct_vg->seqno)
|
|
correct_vg = vg;
|
|
}
|
|
}
|
|
|
|
/* Give up looking */
|
|
if (!correct_vg) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
lvmcache_update_vg(correct_vg);
|
|
|
|
if (inconsistent) {
|
|
if (precommitted) {
|
|
log_error("Inconsistent pre-commit metadata copies "
|
|
"for volume group %s", vgname);
|
|
return NULL;
|
|
}
|
|
|
|
if (!*consistent)
|
|
return correct_vg;
|
|
|
|
/* Don't touch partial volume group metadata */
|
|
/* Should be fixed manually with vgcfgbackup/restore etc. */
|
|
if ((correct_vg->status & PARTIAL_VG)) {
|
|
log_error("Inconsistent metadata copies found for "
|
|
"partial volume group %s", vgname);
|
|
*consistent = 0;
|
|
return correct_vg;
|
|
}
|
|
|
|
log_print("Inconsistent metadata copies found - updating "
|
|
"to use version %u", correct_vg->seqno);
|
|
if (!vg_write(correct_vg)) {
|
|
log_error("Automatic metadata correction failed");
|
|
return NULL;
|
|
}
|
|
if (!vg_commit(correct_vg)) {
|
|
log_error("Automatic metadata correction commit "
|
|
"failed");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if ((correct_vg->status & PVMOVE) && !pvmove_mode()) {
|
|
log_error("WARNING: Interrupted pvmove detected in "
|
|
"volume group %s", correct_vg->name);
|
|
log_error("Please restore the metadata by running "
|
|
"vgcfgrestore.");
|
|
return NULL;
|
|
}
|
|
|
|
*consistent = 1;
|
|
return correct_vg;
|
|
}
|
|
|
|
struct volume_group *vg_read(struct cmd_context *cmd, const char *vgname,
|
|
int *consistent)
|
|
{
|
|
return _vg_read(cmd, vgname, consistent, 0);
|
|
}
|
|
|
|
struct volume_group *vg_read_precommitted(struct cmd_context *cmd,
|
|
const char *vgname,
|
|
int *consistent)
|
|
{
|
|
return _vg_read(cmd, vgname, consistent, 1);
|
|
}
|
|
|
|
/* This is only called by lv_from_lvid, which is only called from
|
|
* activate.c so we know the appropriate VG lock is already held and
|
|
* the vg_read is therefore safe.
|
|
*/
|
|
struct volume_group *vg_read_by_vgid(struct cmd_context *cmd, const char *vgid)
|
|
{
|
|
const char *vgname;
|
|
struct list *vgnames, *slh;
|
|
struct volume_group *vg;
|
|
struct lvmcache_vginfo *vginfo;
|
|
int consistent = 0;
|
|
|
|
/* Is corresponding vgname already cached? */
|
|
if ((vginfo = vginfo_from_vgid(vgid)) &&
|
|
vginfo->vgname && *vginfo->vgname) {
|
|
if ((vg = vg_read(cmd, vginfo->vgname, &consistent)) &&
|
|
!strncmp(vg->id.uuid, vgid, ID_LEN)) {
|
|
if (!consistent) {
|
|
log_error("Volume group %s metadata is "
|
|
"inconsistent", vginfo->vgname);
|
|
return NULL;
|
|
}
|
|
return vg;
|
|
}
|
|
}
|
|
|
|
/* Mustn't scan if memory locked: ensure cache gets pre-populated! */
|
|
if (memlock())
|
|
return NULL;
|
|
|
|
/* FIXME Need a genuine read by ID here - don't vg_read by name! */
|
|
/* FIXME Disabled vgrenames while active for now because we aren't
|
|
* allowed to do a full scan here any more. */
|
|
|
|
// The slow way - full scan required to cope with vgrename
|
|
if (!(vgnames = get_vgs(cmd, 2))) {
|
|
log_error("vg_read_by_vgid: get_vgs failed");
|
|
return NULL;
|
|
}
|
|
|
|
list_iterate(slh, vgnames) {
|
|
vgname = list_item(slh, struct str_list)->str;
|
|
if (!vgname || !*vgname)
|
|
continue; // FIXME Unnecessary?
|
|
consistent = 0;
|
|
if ((vg = vg_read(cmd, vgname, &consistent)) &&
|
|
!strncmp(vg->id.uuid, vgid, ID_LEN)) {
|
|
if (!consistent) {
|
|
log_error("Volume group %s metadata is "
|
|
"inconsistent", vgname);
|
|
return NULL;
|
|
}
|
|
return vg;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Only called by activate.c */
|
|
struct logical_volume *lv_from_lvid(struct cmd_context *cmd, const char *lvid_s)
|
|
{
|
|
struct lv_list *lvl;
|
|
struct volume_group *vg;
|
|
const union lvid *lvid;
|
|
|
|
lvid = (const union lvid *) lvid_s;
|
|
|
|
log_very_verbose("Finding volume group for uuid %s", lvid_s);
|
|
if (!(vg = vg_read_by_vgid(cmd, lvid->id[0].uuid))) {
|
|
log_error("Volume group for uuid not found: %s", lvid_s);
|
|
return NULL;
|
|
}
|
|
|
|
log_verbose("Found volume group \"%s\"", vg->name);
|
|
if (vg->status & EXPORTED_VG) {
|
|
log_error("Volume group \"%s\" is exported", vg->name);
|
|
return NULL;
|
|
}
|
|
if (!(lvl = find_lv_in_vg_by_lvid(vg, lvid))) {
|
|
log_very_verbose("Can't find logical volume id %s", lvid_s);
|
|
return NULL;
|
|
}
|
|
|
|
return lvl->lv;
|
|
}
|
|
|
|
/* FIXME Use label functions instead of PV functions */
|
|
struct physical_volume *pv_read(struct cmd_context *cmd, const char *pv_name,
|
|
struct list *mdas, uint64_t *label_sector,
|
|
int warnings)
|
|
{
|
|
struct physical_volume *pv;
|
|
struct label *label;
|
|
struct lvmcache_info *info;
|
|
struct device *dev;
|
|
|
|
if (!(dev = dev_cache_get(pv_name, cmd->filter))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!(label_read(dev, &label))) {
|
|
if (warnings)
|
|
log_error("No physical volume label read from %s",
|
|
pv_name);
|
|
return 0;
|
|
}
|
|
|
|
info = (struct lvmcache_info *) label->info;
|
|
if (label_sector && *label_sector)
|
|
*label_sector = label->sector;
|
|
|
|
if (!(pv = pool_zalloc(cmd->mem, sizeof(*pv)))) {
|
|
log_error("pv allocation for '%s' failed", pv_name);
|
|
return 0;
|
|
}
|
|
|
|
list_init(&pv->tags);
|
|
|
|
/* FIXME Move more common code up here */
|
|
if (!(info->fmt->ops->pv_read(info->fmt, pv_name, pv, mdas))) {
|
|
log_error("Failed to read existing physical volume '%s'",
|
|
pv_name);
|
|
return 0;
|
|
}
|
|
|
|
if (!pv->size)
|
|
return NULL;
|
|
else
|
|
return pv;
|
|
}
|
|
|
|
/* May return empty list */
|
|
struct list *get_vgs(struct cmd_context *cmd, int full_scan)
|
|
{
|
|
return lvmcache_get_vgnames(cmd, full_scan);
|
|
}
|
|
|
|
struct list *get_pvs(struct cmd_context *cmd)
|
|
{
|
|
struct list *results;
|
|
const char *vgname;
|
|
struct list *pvh, *tmp;
|
|
struct list *vgnames, *slh;
|
|
struct volume_group *vg;
|
|
int consistent = 0;
|
|
int old_partial;
|
|
int old_pvmove;
|
|
|
|
lvmcache_label_scan(cmd, 0);
|
|
|
|
if (!(results = pool_alloc(cmd->mem, sizeof(*results)))) {
|
|
log_error("PV list allocation failed");
|
|
return NULL;
|
|
}
|
|
|
|
list_init(results);
|
|
|
|
/* Get list of VGs */
|
|
if (!(vgnames = get_vgs(cmd, 0))) {
|
|
log_error("get_pvs: get_vgs failed");
|
|
return NULL;
|
|
}
|
|
|
|
/* Read every VG to ensure cache consistency */
|
|
/* Orphan VG is last on list */
|
|
old_partial = partial_mode();
|
|
old_pvmove = pvmove_mode();
|
|
init_partial(1);
|
|
init_pvmove(1);
|
|
list_iterate(slh, vgnames) {
|
|
vgname = list_item(slh, struct str_list)->str;
|
|
if (!vgname)
|
|
continue; /* FIXME Unnecessary? */
|
|
consistent = 0;
|
|
if (!(vg = vg_read(cmd, vgname, &consistent))) {
|
|
stack;
|
|
continue;
|
|
}
|
|
if (!consistent)
|
|
log_print("Warning: Volume Group %s is not consistent",
|
|
vgname);
|
|
|
|
/* Move PVs onto results list */
|
|
list_iterate_safe(pvh, tmp, &vg->pvs) {
|
|
list_add(results, pvh);
|
|
}
|
|
}
|
|
init_pvmove(old_pvmove);
|
|
init_partial(old_partial);
|
|
|
|
return results;
|
|
}
|
|
|
|
int pv_write(struct cmd_context *cmd, struct physical_volume *pv,
|
|
struct list *mdas, int64_t label_sector)
|
|
{
|
|
if (!pv->fmt->ops->pv_write) {
|
|
log_error("Format does not support writing physical volumes");
|
|
return 0;
|
|
}
|
|
|
|
if (*pv->vg_name || pv->pe_alloc_count) {
|
|
log_error("Assertion failed: can't _pv_write non-orphan PV "
|
|
"(in VG %s)", pv->vg_name);
|
|
return 0;
|
|
}
|
|
|
|
if (!pv->fmt->ops->pv_write(pv->fmt, pv, mdas, label_sector)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|