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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "pv_map.h"
#include "pv_alloc.h"
#include <assert.h>
/*
* Areas are maintained in size order, largest first.
*
* FIXME Cope with overlap.
*/
static void _insert_area(struct dm_list *head, struct pv_area *a, unsigned reduced)
{
struct pv_area *pva;
uint32_t count = reduced ? a->unreserved : a->count;
dm_list_iterate_items(pva, head)
if (count > pva->count)
break;
dm_list_add(&pva->list, &a->list);
a->map->pe_count += a->count;
}
static void _remove_area(struct pv_area *a)
{
dm_list_del(&a->list);
a->map->pe_count -= a->count;
}
static int _create_single_area(struct dm_pool *mem, struct pv_map *pvm,
uint32_t start, uint32_t length)
{
struct pv_area *pva;
if (!(pva = dm_pool_zalloc(mem, sizeof(*pva))))
return_0;
log_debug("Allowing allocation on %s start PE %" PRIu32 " length %"
PRIu32, pv_dev_name(pvm->pv), start, length);
pva->map = pvm;
pva->start = start;
pva->count = length;
pva->unreserved = pva->count;
_insert_area(&pvm->areas, pva, 0);
return 1;
}
static int _create_alloc_areas_for_pv(struct dm_pool *mem, struct pv_map *pvm,
uint32_t start, uint32_t count)
{
struct pv_segment *peg;
uint32_t pe, end, area_len;
/* Only select extents from start to end inclusive */
end = start + count - 1;
if (end > pvm->pv->pe_count - 1)
end = pvm->pv->pe_count - 1;
pe = start;
/* Walk through complete ordered list of device segments */
dm_list_iterate_items(peg, &pvm->pv->segments) {
/* pe holds the next extent we want to check */
/* Beyond the range we're interested in? */
if (pe > end)
break;
/* Skip if we haven't reached the first seg we want yet */
if (pe > peg->pe + peg->len - 1)
continue;
/* Free? */
if (peg->lvseg)
goto next;
/* How much of this peg do we need? */
area_len = (end >= peg->pe + peg->len - 1) ?
peg->len - (pe - peg->pe) : end - pe + 1;
if (!_create_single_area(mem, pvm, pe, area_len))
return_0;
next:
pe = peg->pe + peg->len;
}
return 1;
}
static int _create_all_areas_for_pv(struct dm_pool *mem, struct pv_map *pvm,
struct dm_list *pe_ranges)
{
struct pe_range *aa;
if (!pe_ranges) {
/* Use whole PV */
if (!_create_alloc_areas_for_pv(mem, pvm, UINT32_C(0),
pvm->pv->pe_count))
return_0;
return 1;
}
dm_list_iterate_items(aa, pe_ranges) {
if (!_create_alloc_areas_for_pv(mem, pvm, aa->start,
aa->count))
return_0;
}
return 1;
}
static int _create_maps(struct dm_pool *mem, struct dm_list *pvs, struct dm_list *pvms)
{
struct pv_map *pvm, *pvm2;
struct pv_list *pvl;
dm_list_iterate_items(pvl, pvs) {
if (!(pvl->pv->status & ALLOCATABLE_PV))
continue;
if (is_missing_pv(pvl->pv))
continue;
assert(pvl->pv->dev);
pvm = NULL;
dm_list_iterate_items(pvm2, pvms)
if (pvm2->pv->dev == pvl->pv->dev) {
pvm = pvm2;
break;
}
if (!pvm) {
if (!(pvm = dm_pool_zalloc(mem, sizeof(*pvm))))
return_0;
pvm->pv = pvl->pv;
dm_list_init(&pvm->areas);
dm_list_add(pvms, &pvm->list);
}
if (!_create_all_areas_for_pv(mem, pvm, pvl->pe_ranges))
return_0;
}
return 1;
}
/*
* Create list of PV areas available for this particular allocation
*/
struct dm_list *create_pv_maps(struct dm_pool *mem, struct volume_group *vg,
struct dm_list *allocatable_pvs)
{
struct dm_list *pvms;
if (!(pvms = dm_pool_zalloc(mem, sizeof(*pvms)))) {
log_error("create_pv_maps alloc failed");
return NULL;
}
dm_list_init(pvms);
if (!_create_maps(mem, allocatable_pvs, pvms)) {
log_error("Couldn't create physical volume maps in %s",
vg->name);
dm_pool_free(mem, pvms);
return NULL;
}
return pvms;
}
void consume_pv_area(struct pv_area *pva, uint32_t to_go)
{
_remove_area(pva);
assert(to_go <= pva->count);
if (to_go < pva->count) {
/* split the area */
pva->start += to_go;
pva->count -= to_go;
pva->unreserved = pva->count;
_insert_area(&pva->map->areas, pva, 0);
}
}
/*
* Remove an area from list and reinsert it based on its new smaller size
* after a provisional allocation.
*/
void reinsert_reduced_pv_area(struct pv_area *pva)
{
_remove_area(pva);
_insert_area(&pva->map->areas, pva, 1);
}
uint32_t pv_maps_size(struct dm_list *pvms)
{
struct pv_map *pvm;
uint32_t pe_count = 0;
dm_list_iterate_items(pvm, pvms)
pe_count += pvm->pe_count;
return pe_count;
}
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