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74e2acb680
There are two fixes other than improving variable names and updating code layout etc. The loop counter is incremented by area_len instead of area_len * stripes; the 3rd _check_stripe parameter is no longer multiplied by number of stripes.
391 lines
8.4 KiB
C
391 lines
8.4 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 "disk-rep.h"
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#include "lv_alloc.h"
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#include "display.h"
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#include "segtype.h"
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/*
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* After much thought I have decided it is easier,
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* and probably no less efficient, to convert the
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* pe->le map to a full le->pe map, and then
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* process this to get the segments form that
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* we're after. Any code which goes directly from
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* the pe->le map to segments would be gladly
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* accepted, if it is less complicated than this
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* file.
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*/
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struct pe_specifier {
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struct physical_volume *pv;
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uint32_t pe;
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};
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struct lv_map {
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struct logical_volume *lv;
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uint32_t stripes;
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uint32_t stripe_size;
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struct pe_specifier *map;
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};
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static struct dm_hash_table *_create_lv_maps(struct dm_pool *mem,
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struct volume_group *vg)
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{
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struct dm_hash_table *maps = dm_hash_create(32);
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struct lv_list *ll;
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struct lv_map *lvm;
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if (!maps) {
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log_err("Unable to create hash table for holding "
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"extent maps.");
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return NULL;
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}
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list_iterate_items(ll, &vg->lvs) {
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if (ll->lv->status & SNAPSHOT)
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continue;
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if (!(lvm = dm_pool_alloc(mem, sizeof(*lvm)))) {
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stack;
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goto bad;
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}
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lvm->lv = ll->lv;
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if (!(lvm->map = dm_pool_zalloc(mem, sizeof(*lvm->map)
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* ll->lv->le_count))) {
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stack;
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goto bad;
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}
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if (!dm_hash_insert(maps, ll->lv->name, lvm)) {
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stack;
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goto bad;
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}
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}
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return maps;
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bad:
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dm_hash_destroy(maps);
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return NULL;
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}
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static int _fill_lv_array(struct lv_map **lvs,
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struct dm_hash_table *maps, struct disk_list *dl)
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{
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struct lvd_list *ll;
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struct lv_map *lvm;
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memset(lvs, 0, sizeof(*lvs) * MAX_LV);
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list_iterate_items(ll, &dl->lvds) {
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if (!(lvm = dm_hash_lookup(maps, strrchr((char *)ll->lvd.lv_name, '/')
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+ 1))) {
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log_err("Physical volume (%s) contains an "
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"unknown logical volume (%s).",
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dev_name(dl->dev), ll->lvd.lv_name);
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return 0;
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}
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lvm->stripes = ll->lvd.lv_stripes;
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lvm->stripe_size = ll->lvd.lv_stripesize;
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lvs[ll->lvd.lv_number] = lvm;
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}
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return 1;
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}
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static int _fill_maps(struct dm_hash_table *maps, struct volume_group *vg,
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struct list *pvds)
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{
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struct disk_list *dl;
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struct physical_volume *pv;
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struct lv_map *lvms[MAX_LV], *lvm;
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struct pe_disk *e;
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uint32_t i, lv_num, le;
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list_iterate_items(dl, pvds) {
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pv = find_pv(vg, dl->dev);
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e = dl->extents;
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/* build an array of lv's for this pv */
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if (!_fill_lv_array(lvms, maps, dl)) {
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stack;
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return 0;
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}
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for (i = 0; i < dl->pvd.pe_total; i++) {
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lv_num = e[i].lv_num;
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if (lv_num == UNMAPPED_EXTENT)
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continue;
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else {
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lv_num--;
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lvm = lvms[lv_num];
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if (!lvm) {
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log_error("Invalid LV in extent map "
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"(PV %s, PE %" PRIu32
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", LV %" PRIu32
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", LE %" PRIu32 ")",
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dev_name(pv->dev), i,
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lv_num, e[i].le_num);
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return 0;
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}
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le = e[i].le_num;
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if (le >= lvm->lv->le_count) {
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log_err("logical extent number "
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"out of bounds");
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return 0;
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}
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if (lvm->map[le].pv) {
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log_err("logical extent (%u) "
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"already mapped.", le);
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return 0;
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}
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lvm->map[le].pv = pv;
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lvm->map[le].pe = i;
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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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static int _check_single_map(struct lv_map *lvm)
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{
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uint32_t i;
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for (i = 0; i < lvm->lv->le_count; i++) {
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if (!lvm->map[i].pv) {
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log_err("Logical volume (%s) contains an incomplete "
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"mapping table.", lvm->lv->name);
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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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static int _check_maps_are_complete(struct dm_hash_table *maps)
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{
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struct dm_hash_node *n;
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struct lv_map *lvm;
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for (n = dm_hash_get_first(maps); n; n = dm_hash_get_next(maps, n)) {
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lvm = (struct lv_map *) dm_hash_get_data(maps, n);
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if (!_check_single_map(lvm)) {
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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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static uint32_t _area_length(struct lv_map *lvm, uint32_t le)
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{
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uint32_t len = 0;
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do
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len++;
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while ((lvm->map[le + len].pv == lvm->map[le].pv) &&
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(lvm->map[le].pv &&
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lvm->map[le + len].pe == lvm->map[le].pe + len));
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return len;
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}
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static int _read_linear(struct cmd_context *cmd, struct lv_map *lvm)
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{
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uint32_t le = 0, len;
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struct lv_segment *seg;
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struct segment_type *segtype;
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if (!(segtype = get_segtype_from_string(cmd, "striped"))) {
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stack;
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return 0;
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}
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while (le < lvm->lv->le_count) {
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len = _area_length(lvm, le);
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if (!(seg = alloc_lv_segment(cmd->mem, segtype, lvm->lv, le,
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len, 0, 0, NULL, 1, len, 0, 0, 0))) {
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log_error("Failed to allocate linear segment.");
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return 0;
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}
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if (!set_lv_segment_area_pv(seg, 0, lvm->map[le].pv,
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lvm->map[le].pe))
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return_0;
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list_add(&lvm->lv->segments, &seg->list);
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le += seg->len;
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}
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return 1;
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}
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static int _check_stripe(struct lv_map *lvm, uint32_t area_count,
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uint32_t area_len, uint32_t base_le,
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uint32_t total_area_len)
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{
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uint32_t st;
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/*
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* Is the next physical extent in every stripe adjacent to the last?
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*/
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for (st = 0; st < area_count; st++)
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if ((lvm->map[base_le + st * total_area_len + area_len].pv !=
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lvm->map[base_le + st * total_area_len].pv) ||
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(lvm->map[base_le + st * total_area_len].pv &&
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lvm->map[base_le + st * total_area_len + area_len].pe !=
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lvm->map[base_le + st * total_area_len].pe + area_len))
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return 0;
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return 1;
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}
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static int _read_stripes(struct cmd_context *cmd, struct lv_map *lvm)
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{
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uint32_t st, first_area_le = 0, total_area_len;
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uint32_t area_len;
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struct lv_segment *seg;
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struct segment_type *segtype;
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/*
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* Work out overall striped length
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*/
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if (lvm->lv->le_count % lvm->stripes) {
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log_error("Number of stripes (%u) incompatible "
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"with logical extent count (%u) for %s",
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lvm->stripes, lvm->lv->le_count, lvm->lv->name);
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}
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total_area_len = lvm->lv->le_count / lvm->stripes;
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if (!(segtype = get_segtype_from_string(cmd, "striped")))
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return_0;
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while (first_area_le < total_area_len) {
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area_len = 1;
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/*
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* Find how many extents are contiguous in all stripes
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* and so can form part of this segment
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*/
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while (_check_stripe(lvm, lvm->stripes,
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area_len, first_area_le, total_area_len))
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area_len++;
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if (!(seg = alloc_lv_segment(cmd->mem, segtype, lvm->lv,
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lvm->stripes * first_area_le,
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lvm->stripes * area_len,
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0, lvm->stripe_size, NULL,
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lvm->stripes,
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area_len, 0, 0, 0))) {
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log_error("Failed to allocate striped segment.");
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return 0;
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}
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/*
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* Set up start positions of each stripe in this segment
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*/
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for (st = 0; st < seg->area_count; st++)
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if (!set_lv_segment_area_pv(seg, st,
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lvm->map[first_area_le + st * total_area_len].pv,
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lvm->map[first_area_le + st * total_area_len].pe))
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return_0;
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list_add(&lvm->lv->segments, &seg->list);
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first_area_le += area_len;
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}
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return 1;
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}
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static int _build_segments(struct cmd_context *cmd, struct lv_map *lvm)
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{
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return (lvm->stripes > 1 ? _read_stripes(cmd, lvm) :
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_read_linear(cmd, lvm));
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}
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static int _build_all_segments(struct cmd_context *cmd, struct dm_hash_table *maps)
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{
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struct dm_hash_node *n;
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struct lv_map *lvm;
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for (n = dm_hash_get_first(maps); n; n = dm_hash_get_next(maps, n)) {
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lvm = (struct lv_map *) dm_hash_get_data(maps, n);
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if (!_build_segments(cmd, lvm)) {
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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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int import_extents(struct cmd_context *cmd, struct volume_group *vg,
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struct list *pvds)
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{
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int r = 0;
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struct dm_pool *scratch = dm_pool_create("lvm1 import_extents", 10 * 1024);
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struct dm_hash_table *maps;
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if (!scratch) {
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stack;
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return 0;
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}
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if (!(maps = _create_lv_maps(scratch, vg))) {
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log_err("Couldn't allocate logical volume maps.");
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goto out;
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}
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if (!_fill_maps(maps, vg, pvds)) {
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log_err("Couldn't fill logical volume maps.");
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goto out;
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}
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if (!_check_maps_are_complete(maps) && !(vg->status & PARTIAL_VG)) {
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stack;
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goto out;
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}
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if (!_build_all_segments(cmd, maps)) {
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log_err("Couldn't build extent segments.");
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goto out;
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}
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r = 1;
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out:
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if (maps)
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dm_hash_destroy(maps);
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dm_pool_destroy(scratch);
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return r;
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}
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