mirror of
git://sourceware.org/git/lvm2.git
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318 lines
7.8 KiB
C
318 lines
7.8 KiB
C
/*
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* Copyright (C) 2003-2004 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 "metadata.h"
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#include "toolcontext.h"
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#include "segtypes.h"
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#include "display.h"
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#include "activate.h"
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/*
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* Replace any LV segments on given PV with temporary mirror.
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* Returns list of LVs changed.
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*/
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int insert_pvmove_mirrors(struct cmd_context *cmd,
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struct logical_volume *lv_mirr,
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struct physical_volume *pv,
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struct logical_volume *lv,
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struct list *allocatable_pvs,
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struct list *lvs_changed)
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{
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struct list *segh;
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struct lv_segment *seg;
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struct lv_list *lvl;
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int lv_used = 0;
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uint32_t s, start_le, extent_count = 0u;
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struct segment_type *segtype;
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if (!(segtype = get_segtype_from_string(lv->vg->cmd, "mirror"))) {
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stack;
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return 0;
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}
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if (activation() && segtype->ops->target_present &&
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!segtype->ops->target_present()) {
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log_error("%s: Required device-mapper target(s) not "
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"detected in your kernel", segtype->name);
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return 0;
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}
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/* Work through all segments on the supplied PV */
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list_iterate(segh, &lv->segments) {
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seg = list_item(segh, struct lv_segment);
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for (s = 0; s < seg->area_count; s++) {
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if (seg->area[s].type != AREA_PV ||
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seg->area[s].u.pv.pv->dev != pv->dev)
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continue;
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/* First time, add LV to list of LVs affected */
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if (!lv_used) {
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if (!(lvl = pool_alloc(cmd->mem, sizeof(*lvl)))) {
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log_error("lv_list alloc failed");
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return 0;
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}
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lvl->lv = lv;
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list_add(lvs_changed, &lvl->list);
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lv_used = 1;
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}
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start_le = lv_mirr->le_count;
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if (!lv_extend(lv->vg->fid, lv_mirr, segtype, 1,
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seg->area_len, 0u, seg->area_len,
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seg->area[s].u.pv.pv,
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seg->area[s].u.pv.pe,
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PVMOVE, allocatable_pvs,
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lv->alloc)) {
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log_error("Allocation for temporary "
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"pvmove LV failed");
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return 0;
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}
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seg->area[s].type = AREA_LV;
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seg->area[s].u.lv.lv = lv_mirr;
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seg->area[s].u.lv.le = start_le;
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extent_count += seg->area_len;
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lv->status |= LOCKED;
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}
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}
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log_verbose("Moving %u extents of logical volume %s/%s", extent_count,
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lv->vg->name, lv->name);
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return 1;
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}
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/* Remove a temporary mirror */
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int remove_pvmove_mirrors(struct volume_group *vg,
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struct logical_volume *lv_mirr)
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{
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struct list *lvh, *segh;
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struct logical_volume *lv1;
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struct lv_segment *seg, *mir_seg;
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uint32_t s, c;
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/* Loop through all LVs except the temporary mirror */
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list_iterate(lvh, &vg->lvs) {
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lv1 = list_item(lvh, struct lv_list)->lv;
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if (lv1 == lv_mirr)
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continue;
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/* Find all segments that point at the temporary mirror */
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list_iterate(segh, &lv1->segments) {
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seg = list_item(segh, struct lv_segment);
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for (s = 0; s < seg->area_count; s++) {
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if (seg->area[s].type != AREA_LV ||
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seg->area[s].u.lv.lv != lv_mirr)
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continue;
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/* Find the mirror segment pointed at */
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if (!(mir_seg = find_seg_by_le(lv_mirr,
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seg->area[s].
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u.lv.le))) {
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/* FIXME Error message */
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log_error("No segment found with LE");
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return 0;
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}
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/* Check the segment params are compatible */
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/* FIXME Improve error mesg & remove restrcn */
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if ((!(mir_seg->segtype->flags
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& SEG_AREAS_MIRRORED)) ||
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!(mir_seg->status & PVMOVE) ||
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mir_seg->le != seg->area[s].u.lv.le ||
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mir_seg->area_count != 2 ||
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mir_seg->area_len != seg->area_len) {
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log_error("Incompatible segments");
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return 0;
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}
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/* Replace original segment with newly-mirrored
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* area (or original if reverting)
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*/
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if (mir_seg->extents_copied ==
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mir_seg->area_len)
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c = 1;
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else
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c = 0;
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seg->area[s].type = AREA_PV;
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seg->area[s].u.pv.pv = mir_seg->area[c].u.pv.pv;
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seg->area[s].u.pv.pe = mir_seg->area[c].u.pv.pe;
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/* Replace mirror with old area */
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if (!
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(mir_seg->segtype =
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get_segtype_from_string(vg->cmd,
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"striped"))) {
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log_error("Missing striped segtype");
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return 0;
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}
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mir_seg->area_count = 1;
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/* FIXME Assumes only one pvmove at a time! */
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lv1->status &= ~LOCKED;
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}
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}
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}
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return 1;
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}
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const char *get_pvmove_pvname_from_lv_mirr(struct logical_volume *lv_mirr)
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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_mirr->segments) {
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seg = list_item(segh, struct lv_segment);
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if (!(seg->segtype->flags & SEG_AREAS_MIRRORED))
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continue;
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if (seg->area[0].type != AREA_PV)
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continue;
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return dev_name(seg->area[0].u.pv.pv->dev);
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}
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return NULL;
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}
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const char *get_pvmove_pvname_from_lv(struct logical_volume *lv)
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{
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struct list *segh;
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struct lv_segment *seg;
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uint32_t s;
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list_iterate(segh, &lv->segments) {
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seg = list_item(segh, struct lv_segment);
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for (s = 0; s < seg->area_count; s++) {
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if (seg->area[s].type != AREA_LV)
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continue;
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return get_pvmove_pvname_from_lv_mirr(seg->area[s].u.lv.lv);
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}
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}
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return NULL;
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}
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struct logical_volume *find_pvmove_lv(struct volume_group *vg,
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struct device *dev,
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uint32_t lv_type)
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{
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struct list *lvh, *segh;
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struct logical_volume *lv;
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struct lv_segment *seg;
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/* Loop through all LVs */
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list_iterate(lvh, &vg->lvs) {
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lv = list_item(lvh, struct lv_list)->lv;
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if (!(lv->status & lv_type))
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continue;
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/* Check segment origins point to pvname */
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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 (seg->area[0].type != AREA_PV)
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continue;
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if (seg->area[0].u.pv.pv->dev != dev)
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continue;
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return lv;
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}
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}
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return NULL;
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}
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struct logical_volume *find_pvmove_lv_from_pvname(struct cmd_context *cmd,
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struct volume_group *vg,
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const char *name,
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uint32_t lv_type)
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{
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struct physical_volume *pv;
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if (!(pv = find_pv_by_name(cmd, name))) {
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stack;
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return NULL;
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}
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return find_pvmove_lv(vg, pv->dev, lv_type);
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}
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struct list *lvs_using_lv(struct cmd_context *cmd, struct volume_group *vg,
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struct logical_volume *lv)
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{
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struct list *lvh, *segh, *lvs;
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struct logical_volume *lv1;
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struct lv_list *lvl;
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struct lv_segment *seg;
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uint32_t s;
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if (!(lvs = pool_alloc(cmd->mem, sizeof(*lvs)))) {
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log_error("lvs list alloc failed");
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return NULL;
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}
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list_init(lvs);
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/* Loop through all LVs except the one supplied */
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list_iterate(lvh, &vg->lvs) {
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lv1 = list_item(lvh, struct lv_list)->lv;
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if (lv1 == lv)
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continue;
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/* Find whether any segment points at the supplied LV */
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list_iterate(segh, &lv1->segments) {
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seg = list_item(segh, struct lv_segment);
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for (s = 0; s < seg->area_count; s++) {
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if (seg->area[s].type != AREA_LV ||
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seg->area[s].u.lv.lv != lv)
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continue;
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if (!(lvl = pool_alloc(cmd->mem, sizeof(*lvl)))) {
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log_error("lv_list alloc failed");
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return NULL;
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}
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lvl->lv = lv1;
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list_add(lvs, &lvl->list);
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goto next_lv;
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}
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}
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next_lv:
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;
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}
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return lvs;
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}
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float copy_percent(struct logical_volume *lv_mirr)
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{
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uint32_t numerator = 0u, denominator = 0u;
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struct list *segh;
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struct lv_segment *seg;
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list_iterate(segh, &lv_mirr->segments) {
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seg = list_item(segh, struct lv_segment);
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denominator += seg->area_len;
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if (seg->segtype->flags & SEG_AREAS_MIRRORED)
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numerator += seg->extents_copied;
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else
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numerator += seg->area_len;
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}
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return denominator ? (float) numerator *100 / denominator : 100.0;
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}
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