/* $NetBSD: striped.c,v 1.1.1.2 2009/12/02 00:26:47 haad Exp $ */
/*
* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 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 "toolcontext.h"
#include "segtype.h"
#include "display.h"
#include "text_export.h"
#include "text_import.h"
#include "config.h"
#include "str_list.h"
#include "targets.h"
#include "lvm-string.h"
#include "activate.h"
#include "pv_alloc.h"
#include "metadata.h"
static const char *_striped_name(const struct lv_segment *seg)
{
return (seg->area_count == 1) ? "linear" : seg->segtype->name;
}
static void _striped_display(const struct lv_segment *seg)
{
uint32_t s;
if (seg->area_count == 1)
display_stripe(seg, 0, " ");
else {
log_print(" Stripes\t\t%u", seg->area_count);
if (seg->lv->vg->cmd->si_unit_consistency)
log_print(" Stripe size\t\t%s",
display_size(seg->lv->vg->cmd,
(uint64_t) seg->stripe_size));
else
log_print(" Stripe size\t\t%u KB",
seg->stripe_size / 2);
for (s = 0; s < seg->area_count; s++) {
log_print(" Stripe %d:", s);
display_stripe(seg, s, " ");
}
}
log_print(" ");
}
static int _striped_text_import_area_count(struct config_node *sn, uint32_t *area_count)
{
if (!get_config_uint32(sn, "stripe_count", area_count)) {
log_error("Couldn't read 'stripe_count' for "
"segment '%s'.", config_parent_name(sn));
return 0;
}
return 1;
}
static int _striped_text_import(struct lv_segment *seg, const struct config_node *sn,
struct dm_hash_table *pv_hash)
{
struct config_node *cn;
if ((seg->area_count != 1) &&
!get_config_uint32(sn, "stripe_size", &seg->stripe_size)) {
log_error("Couldn't read stripe_size for segment %s "
"of logical volume %s.", config_parent_name(sn), seg->lv->name);
return 0;
}
if (!(cn = find_config_node(sn, "stripes"))) {
log_error("Couldn't find stripes array for segment %s "
"of logical volume %s.", config_parent_name(sn), seg->lv->name);
return 0;
}
seg->area_len /= seg->area_count;
return text_import_areas(seg, sn, cn, pv_hash, 0);
}
static int _striped_text_export(const struct lv_segment *seg, struct formatter *f)
{
outf(f, "stripe_count = %u%s", seg->area_count,
(seg->area_count == 1) ? "\t# linear" : "");
if (seg->area_count > 1)
out_size(f, (uint64_t) seg->stripe_size,
"stripe_size = %u", seg->stripe_size);
return out_areas(f, seg, "stripe");
}
/*
* Test whether two segments could be merged by the current merging code
*/
static int _striped_segments_compatible(struct lv_segment *first,
struct lv_segment *second)
{
uint32_t width;
unsigned s;
if ((first->area_count != second->area_count) ||
(first->stripe_size != second->stripe_size))
return 0;
for (s = 0; s < first->area_count; s++) {
/* FIXME Relax this to first area type != second area type */
/* plus the additional AREA_LV checks needed */
if ((seg_type(first, s) != AREA_PV) ||
(seg_type(second, s) != AREA_PV))
return 0;
width = first->area_len;
if ((seg_pv(first, s) !=
seg_pv(second, s)) ||
(seg_pe(first, s) + width !=
seg_pe(second, s)))
return 0;
}
if (!str_list_lists_equal(&first->tags, &second->tags))
return 0;
return 1;
}
static int _striped_merge_segments(struct lv_segment *seg1, struct lv_segment *seg2)
{
uint32_t s;
if (!_striped_segments_compatible(seg1, seg2))
return 0;
seg1->len += seg2->len;
seg1->area_len += seg2->area_len;
for (s = 0; s < seg1->area_count; s++)
if (seg_type(seg1, s) == AREA_PV)
merge_pv_segments(seg_pvseg(seg1, s),
seg_pvseg(seg2, s));
return 1;
}
#ifdef DEVMAPPER_SUPPORT
static int _striped_add_target_line(struct dev_manager *dm,
struct dm_pool *mem __attribute((unused)),
struct cmd_context *cmd __attribute((unused)),
void **target_state __attribute((unused)),
struct lv_segment *seg,
struct dm_tree_node *node, uint64_t len,
uint32_t *pvmove_mirror_count __attribute((unused)))
{
if (!seg->area_count) {
log_error("Internal error: striped add_target_line called "
"with no areas for %s.", seg->lv->name);
return 0;
}
if (seg->area_count == 1) {
if (!dm_tree_node_add_linear_target(node, len))
return_0;
} else if (!dm_tree_node_add_striped_target(node, len,
seg->stripe_size))
return_0;
return add_areas_line(dm, seg, node, 0u, seg->area_count);
}
static int _striped_target_present(struct cmd_context *cmd,
const struct lv_segment *seg __attribute((unused)),
unsigned *attributes __attribute((unused)))
{
static int _striped_checked = 0;
static int _striped_present = 0;
if (!_striped_checked)
_striped_present = target_present(cmd, "linear", 0) &&
target_present(cmd, "striped", 0);
_striped_checked = 1;
return _striped_present;
}
#endif
static void _striped_destroy(const struct segment_type *segtype)
{
dm_free((void *)segtype);
}
static struct segtype_handler _striped_ops = {
.name = _striped_name,
.display = _striped_display,
.text_import_area_count = _striped_text_import_area_count,
.text_import = _striped_text_import,
.text_export = _striped_text_export,
.merge_segments = _striped_merge_segments,
#ifdef DEVMAPPER_SUPPORT
.add_target_line = _striped_add_target_line,
.target_present = _striped_target_present,
#endif
.destroy = _striped_destroy,
};
struct segment_type *init_striped_segtype(struct cmd_context *cmd)
{
struct segment_type *segtype = dm_malloc(sizeof(*segtype));
if (!segtype)
return_NULL;
segtype->cmd = cmd;
segtype->ops = &_striped_ops;
segtype->name = "striped";
segtype->private = NULL;
segtype->flags =
SEG_CAN_SPLIT | SEG_AREAS_STRIPED | SEG_FORMAT1_SUPPORT;
log_very_verbose("Initialised segtype: %s", segtype->name);
return segtype;
}