mirror of
git://sourceware.org/git/lvm2.git
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529 lines
12 KiB
C
529 lines
12 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 "segtype.h"
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#include "display.h"
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#include "activate.h"
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#include "lv_alloc.h"
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#include "lvm-string.h"
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/*
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* Reduce mirrored_seg to num_mirrors images.
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*/
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int remove_mirror_images(struct lv_segment *mirrored_seg, uint32_t num_mirrors)
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{
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uint32_t m;
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for (m = num_mirrors; m < mirrored_seg->area_count; m++) {
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if (!lv_remove(seg_lv(mirrored_seg, m))) {
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stack;
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return 0;
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}
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}
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mirrored_seg->area_count = num_mirrors;
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return 1;
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}
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int remove_all_mirror_images(struct logical_volume *lv)
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{
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struct lv_segment *first_seg, *seg;
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struct logical_volume *lv1;
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list_iterate_items(first_seg, &lv->segments)
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break;
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if (!remove_mirror_images(first_seg, 1)) {
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stack;
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return 0;
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}
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if (!lv_remove(first_seg->log_lv)) {
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stack;
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return 0;
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}
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lv1 = seg_lv(first_seg, 0);
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lv->segments = lv1->segments;
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lv->segments.n->p = &lv->segments;
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lv->segments.p->n = &lv->segments;
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list_init(&lv1->segments);
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lv1->le_count = 0;
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lv1->size = 0;
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if (!lv_remove(lv1)) {
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stack;
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return 0;
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}
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lv->status &= ~MIRRORED;
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list_iterate_items(seg, &lv->segments)
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seg->lv = lv;
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return 1;
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}
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/*
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* Add mirror images to an existing mirror
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*/
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/* FIXME
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int add_mirror_images(struct alloc_handle *ah,
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uint32_t first_area,
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uint32_t num_areas,
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struct logical_volume *lv)
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{
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}
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*/
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int create_mirror_layers(struct alloc_handle *ah,
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uint32_t first_area,
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uint32_t num_mirrors,
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struct logical_volume *lv,
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struct segment_type *segtype,
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uint32_t status,
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uint32_t region_size,
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struct logical_volume *log_lv)
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{
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uint32_t m;
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struct logical_volume **img_lvs;
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char *img_name;
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size_t len;
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if (!(img_lvs = alloca(sizeof(*img_lvs) * num_mirrors))) {
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log_error("img_lvs allocation failed. "
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"Remove new LV and retry.");
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return 0;
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}
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len = strlen(lv->name) + 32;
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if (!(img_name = alloca(len))) {
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log_error("img_name allocation failed. "
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"Remove new LV and retry.");
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return 0;
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}
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if (lvm_snprintf(img_name, len, "%s_mimage_%%d", lv->name) < 0) {
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log_error("img_name allocation failed. "
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"Remove new LV and retry.");
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return 0;
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}
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for (m = 0; m < num_mirrors; m++) {
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if (!(img_lvs[m] = lv_create_empty(lv->vg->fid, img_name,
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NULL, LVM_READ | LVM_WRITE,
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ALLOC_INHERIT, 0, lv->vg))) {\
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log_error("Aborting. Failed to create submirror LV. "
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"Remove new LV and retry.");
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return 0;
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}
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if (!lv_add_segment(ah, m, 1, img_lvs[m],
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get_segtype_from_string(lv->vg->cmd,
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"striped"),
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0, NULL, 0, 0, 0, NULL)) {
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log_error("Aborting. Failed to add submirror segment "
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"to %s. Remove new LV and retry.",
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img_lvs[m]->name);
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return 0;
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}
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}
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if (!lv_add_mirror_segment(ah, lv, img_lvs, num_mirrors, segtype,
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0, region_size, log_lv)) {
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log_error("Aborting. Failed to add mirror segment. "
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"Remove new LV and retry.");
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return 0;
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}
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return 1;
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}
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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 list *source_pvl,
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struct logical_volume *lv,
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struct list *allocatable_pvs,
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alloc_policy_t alloc,
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struct list *lvs_changed)
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{
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struct lv_segment *seg;
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struct lv_list *lvl;
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struct pv_list *pvl;
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struct physical_volume *pv;
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uint32_t pe;
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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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struct pe_range *per;
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uint32_t pe_start, pe_end, per_end, stripe_multiplier;
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/* Only 1 PV may feature in source_pvl */
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pvl = list_item(source_pvl->n, struct pv_list);
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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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/* Split LV segments to match PE ranges */
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list_iterate_items(seg, &lv->segments) {
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for (s = 0; s < seg->area_count; s++) {
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if (seg_type(seg, s) != AREA_PV ||
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seg_dev(seg, s) != pvl->pv->dev)
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continue;
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/* Do these PEs need moving? */
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list_iterate_items(per, pvl->pe_ranges) {
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pe_start = seg_pe(seg, s);
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pe_end = pe_start + seg->area_len - 1;
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per_end = per->start + per->count - 1;
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/* No overlap? */
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if ((pe_end < per->start) ||
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(pe_start > per_end))
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continue;
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if (seg_is_striped(seg))
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stripe_multiplier = seg->area_count;
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else
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stripe_multiplier = 1;
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if ((per->start != pe_start &&
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per->start > pe_start) &&
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!lv_split_segment(lv, seg->le +
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(per->start - pe_start) *
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stripe_multiplier)) {
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stack;
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return 0;
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}
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if ((per_end != pe_end &&
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per_end < pe_end) &&
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!lv_split_segment(lv, seg->le +
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(per_end - pe_start + 1) *
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stripe_multiplier)) {
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stack;
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return 0;
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}
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}
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}
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}
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/* Work through all segments on the supplied PV */
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list_iterate_items(seg, &lv->segments) {
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for (s = 0; s < seg->area_count; s++) {
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if (seg_type(seg, s) != AREA_PV ||
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seg_dev(seg, s) != pvl->pv->dev)
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continue;
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pe_start = seg_pe(seg, s);
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/* Do these PEs need moving? */
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list_iterate_items(per, pvl->pe_ranges) {
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per_end = per->start + per->count - 1;
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if ((pe_start < per->start) ||
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(pe_start > per_end))
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continue;
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log_debug("Matched PE range %u-%u against "
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"%s %u len %u", per->start, per_end,
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dev_name(seg_dev(seg, s)),
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seg_pe(seg, s),
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seg->area_len);
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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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pv = seg_pv(seg, s);
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pe = seg_pe(seg, s);
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log_very_verbose("Moving %s:%u-%u of %s/%s",
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dev_name(pvl->pv->dev),
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pe, pe + seg->area_len - 1,
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lv->vg->name, lv->name);
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start_le = lv_mirr->le_count;
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/* FIXME Clean this up */
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release_lv_segment_area(seg, s, seg->area_len);
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if (!lv_extend(lv_mirr, segtype, 1,
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seg->area_len, 0u, seg->area_len,
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pv, pe,
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PVMOVE, allocatable_pvs,
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alloc)) {
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log_error("Unable to allocate "
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"temporary LV for pvmove.");
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return 0;
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}
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set_lv_segment_area_lv(seg, s, lv_mirr, start_le, 0);
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extent_count += seg->area_len;
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lv->status |= LOCKED;
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break;
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}
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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 lv_list *lvl;
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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_items(lvl, &vg->lvs) {
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lv1 = lvl->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_items(seg, &lv1->segments) {
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for (s = 0; s < seg->area_count; s++) {
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if (seg_type(seg, s) != AREA_LV ||
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seg_lv(seg, s) != 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_le(seg, s)))) {
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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 (!seg_is_mirrored(mir_seg) ||
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!(mir_seg->status & PVMOVE) ||
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mir_seg->le != seg_le(seg, s) ||
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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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if (!move_lv_segment_area(seg, s, mir_seg, c)) {
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stack;
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return 0;
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}
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release_lv_segment_area(mir_seg, !c, mir_seg->area_len);
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/* Replace mirror with error segment */
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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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"error"))) {
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log_error("Missing error segtype");
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return 0;
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}
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mir_seg->area_count = 0;
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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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if (!lv_merge_segments(lv1))
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stack;
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}
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if (!lv_empty(lv_mirr)) {
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stack;
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return 0;
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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 lv_segment *seg;
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list_iterate_items(seg, &lv_mirr->segments) {
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if (!seg_is_mirrored(seg))
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continue;
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if (seg_type(seg, 0) != AREA_PV)
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continue;
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return dev_name(seg_dev(seg, 0));
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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 lv_segment *seg;
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uint32_t s;
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list_iterate_items(seg, &lv->segments) {
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for (s = 0; s < seg->area_count; s++) {
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if (seg_type(seg, s) != AREA_LV)
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continue;
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return get_pvmove_pvname_from_lv_mirr(seg_lv(seg, s));
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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 lv_list *lvl;
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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_items(lvl, &vg->lvs) {
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lv = lvl->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_items(seg, &lv->segments) {
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if (seg_type(seg, 0) != AREA_PV)
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continue;
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if (seg_dev(seg, 0) != 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 *lvs;
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struct logical_volume *lv1;
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struct lv_list *lvl, *lvl1;
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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_items(lvl1, &vg->lvs) {
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lv1 = lvl1->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_items(seg, &lv1->segments) {
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for (s = 0; s < seg->area_count; s++) {
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if (seg_type(seg, s) != AREA_LV ||
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seg_lv(seg, s) != 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 lv_segment *seg;
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list_iterate_items(seg, &lv_mirr->segments) {
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denominator += seg->area_len;
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if (seg_is_mirrored(seg))
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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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