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303 lines
7.4 KiB
C
303 lines
7.4 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 "metadata.h"
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#include "toolcontext.h"
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#include "lv_alloc.h"
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#include "pv_alloc.h"
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#include "str_list.h"
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#include "segtype.h"
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/*
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* Attempt to merge two adjacent segments.
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* Currently only supports striped segments on AREA_PV.
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* Returns success if successful, in which case 'first'
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* gets adjusted to contain both areas.
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*/
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static int _merge(struct lv_segment *first, struct lv_segment *second)
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{
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if (!first || !second || first->segtype != second->segtype ||
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!first->segtype->ops->merge_segments) return 0;
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return first->segtype->ops->merge_segments(first, second);
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}
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int lv_merge_segments(struct logical_volume *lv)
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{
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struct list *segh, *t;
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struct lv_segment *current, *prev = NULL;
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if (lv->status & LOCKED || lv->status & PVMOVE)
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return 1;
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list_iterate_safe(segh, t, &lv->segments) {
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current = list_item(segh, struct lv_segment);
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if (_merge(prev, current))
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list_del(¤t->list);
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else
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prev = current;
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}
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return 1;
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}
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/*
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* Verify that an LV's segments are consecutive, complete and don't overlap.
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*/
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int check_lv_segments(struct logical_volume *lv, int complete_vg)
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{
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struct lv_segment *seg, *seg2;
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uint32_t le = 0;
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unsigned seg_count = 0;
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int r = 1;
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uint32_t area_multiplier, s;
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list_iterate_items(seg, &lv->segments) {
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seg_count++;
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if (seg->le != le) {
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log_error("LV %s invalid: segment %u should begin at "
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"LE %" PRIu32 " (found %" PRIu32 ").",
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lv->name, seg_count, le, seg->le);
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r = 0;
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}
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area_multiplier = segtype_is_striped(seg->segtype) ?
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seg->area_count : 1;
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if (seg->area_len * area_multiplier != seg->len) {
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log_error("LV %s: segment %u has inconsistent "
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"area_len %u",
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lv->name, seg_count, seg->area_len);
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r = 0;
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}
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if (complete_vg && seg->log_lv) {
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if (!seg_is_mirrored(seg)) {
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log_error("LV %s: segment %u has log LV but "
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"is not mirrored",
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lv->name, seg_count);
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r = 0;
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}
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if (!(seg->log_lv->status & MIRROR_LOG)) {
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log_error("LV %s: segment %u log LV %s is not "
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"a mirror log",
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lv->name, seg_count, seg->log_lv->name);
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r = 0;
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}
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if (!(seg2 = first_seg(seg->log_lv)) ||
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seg2->mirror_seg != seg) {
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log_error("LV %s: segment %u log LV does not "
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"point back to mirror segment",
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lv->name, seg_count);
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r = 0;
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}
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}
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if (complete_vg && seg->status & MIRROR_IMAGE) {
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if (!seg->mirror_seg ||
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!seg_is_mirrored(seg->mirror_seg)) {
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log_error("LV %s: segment %u mirror image "
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"is not mirrored",
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lv->name, seg_count);
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r = 0;
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}
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}
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for (s = 0; s < seg->area_count; s++) {
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if (seg_type(seg, s) == AREA_UNASSIGNED) {
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log_error("LV %s: segment %u has unassigned "
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"area %u.",
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lv->name, seg_count, s);
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r = 0;
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} else if (seg_type(seg, s) == AREA_PV) {
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if (!seg_pvseg(seg, s) ||
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seg_pvseg(seg, s)->lvseg != seg ||
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seg_pvseg(seg, s)->lv_area != s) {
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log_error("LV %s: segment %u has "
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"inconsistent PV area %u",
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lv->name, seg_count, s);
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r = 0;
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}
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} else {
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if (!seg_lv(seg, s) ||
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seg_lv(seg, s)->vg != lv->vg ||
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seg_lv(seg, s) == lv) {
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log_error("LV %s: segment %u has "
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"inconsistent LV area %u",
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lv->name, seg_count, s);
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r = 0;
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}
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if (complete_vg && seg_lv(seg, s) &&
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(seg_lv(seg, s)->status & MIRROR_IMAGE) &&
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(find_seg_by_le(seg_lv(seg, s),
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seg_le(seg, s))->mirror_seg
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!= seg)) {
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log_error("LV %s: segment %u mirror "
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"image %u missing mirror ptr",
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lv->name, seg_count, s);
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r = 0;
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}
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/* FIXME I don't think this ever holds?
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if (seg_le(seg, s) != le) {
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log_error("LV %s: segment %u has "
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"inconsistent LV area %u "
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"size",
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lv->name, seg_count, s);
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r = 0;
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}
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*/
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}
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}
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le += seg->len;
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}
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if (le != lv->le_count) {
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log_error("LV %s: inconsistent LE count %u != %u",
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lv->name, le, lv->le_count);
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r = 0;
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}
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return r;
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}
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/*
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* Split the supplied segment at the supplied logical extent
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* NB Use LE numbering that works across stripes PV1: 0,2,4 PV2: 1,3,5 etc.
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*/
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static int _lv_split_segment(struct logical_volume *lv, struct lv_segment *seg,
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uint32_t le)
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{
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struct lv_segment *split_seg;
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uint32_t s;
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uint32_t offset = le - seg->le;
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uint32_t area_offset;
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if (!seg_can_split(seg)) {
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log_error("Unable to split the %s segment at LE %" PRIu32
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" in LV %s", seg->segtype->name, le, lv->name);
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return 0;
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}
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/* Clone the existing segment */
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if (!(split_seg = alloc_lv_segment(lv->vg->cmd->mem, seg->segtype,
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seg->lv, seg->le, seg->len,
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seg->status, seg->stripe_size,
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seg->log_lv,
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seg->area_count, seg->area_len,
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seg->chunk_size, seg->region_size,
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seg->extents_copied))) {
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log_error("Couldn't allocate cloned LV segment.");
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return 0;
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}
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if (!str_list_dup(lv->vg->cmd->mem, &split_seg->tags, &seg->tags)) {
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log_error("LV segment tags duplication failed");
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return 0;
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}
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/* In case of a striped segment, the offset has to be / stripes */
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area_offset = offset;
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if (seg_is_striped(seg))
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area_offset /= seg->area_count;
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split_seg->area_len -= area_offset;
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seg->area_len = area_offset;
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split_seg->len -= offset;
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seg->len = offset;
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split_seg->le = seg->le + seg->len;
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/* Adjust the PV mapping */
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for (s = 0; s < seg->area_count; s++) {
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seg_type(split_seg, s) = seg_type(seg, s);
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/* Split area at the offset */
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switch (seg_type(seg, s)) {
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case AREA_LV:
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seg_lv(split_seg, s) = seg_lv(seg, s);
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seg_le(split_seg, s) =
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seg_le(seg, s) + seg->area_len;
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log_debug("Split %s:%u[%u] at %u: %s LE %u", lv->name,
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seg->le, s, le, seg_lv(seg, s)->name,
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seg_le(split_seg, s));
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break;
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case AREA_PV:
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if (!(seg_pvseg(split_seg, s) =
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assign_peg_to_lvseg(seg_pv(seg, s),
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seg_pe(seg, s) +
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seg->area_len,
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seg_pvseg(seg, s)->len -
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seg->area_len,
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split_seg, s))) {
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stack;
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return 0;
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}
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log_debug("Split %s:%u[%u] at %u: %s PE %u", lv->name,
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seg->le, s, le,
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dev_name(seg_dev(seg, s)),
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seg_pe(split_seg, s));
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break;
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case AREA_UNASSIGNED:
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log_error("Unassigned area %u found in segment", s);
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return 0;
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}
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}
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/* Add split off segment to the list _after_ the original one */
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list_add_h(&seg->list, &split_seg->list);
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return 1;
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}
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/*
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* Ensure there's a segment boundary at the given logical extent
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*/
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int lv_split_segment(struct logical_volume *lv, uint32_t le)
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{
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struct lv_segment *seg;
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if (!(seg = find_seg_by_le(lv, le))) {
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log_error("Segment with extent %" PRIu32 " in LV %s not found",
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le, lv->name);
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return 0;
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}
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/* This is a segment start already */
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if (le == seg->le)
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return 1;
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if (!_lv_split_segment(lv, seg, le)) {
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stack;
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return 0;
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}
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if (!vg_validate(lv->vg)) {
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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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