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/*
* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004 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 General Public License v.2.
*
* You should have received a copy of the GNU 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 "pool.h"
#include "list.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"
static const char *_name(const struct lv_segment *seg)
{
return (seg->area_count == 1) ? "linear" : seg->segtype->name;
}
static void _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);
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 _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'.", sn->key);
return 0;
}
return 1;
}
static int _text_import(struct lv_segment *seg, const struct config_node *sn,
struct 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'.",
sn->key);
return 0;
}
if (!(cn = find_config_node(sn, "stripes"))) {
log_error("Couldn't find stripes array for segment "
"'%s'.", sn->key);
return 0;
}
seg->area_len /= seg->area_count;
return text_import_areas(seg, sn, cn, pv_hash);
}
static int _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 _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 ((first->area[s].type != AREA_PV) ||
(second->area[s].type != AREA_PV)) return 0;
width = first->area_len;
if ((first->area[s].u.pv.pv != second->area[s].u.pv.pv) ||
(first->area[s].u.pv.pe + width != second->area[s].u.pv.pe))
return 0;
}
if (!str_list_lists_equal(&first->tags, &second->tags))
return 0;
return 1;
}
static int _merge_segments(struct lv_segment *seg1, struct lv_segment *seg2)
{
if (!_segments_compatible(seg1, seg2))
return 0;
seg1->len += seg2->len;
seg1->area_len += seg2->area_len;
return 1;
}
#ifdef DEVMAPPER_SUPPORT
static int _compose_target_line(struct dev_manager *dm, struct pool *mem,
struct config_tree *cft, void **target_state,
struct lv_segment *seg, char *params,
size_t paramsize, const char **target, int *pos,
uint32_t *pvmove_mirror_count)
{
/* linear [device offset]+
* striped #stripes stripe_size [device offset]+ */
if (seg->area_count == 1)
*target = "linear";
else if (seg->area_count > 1) {
*target = "striped";
if ((*pos = lvm_snprintf(params, paramsize, "%u %u ",
seg->area_count,
seg->stripe_size)) < 0) {
stack;
return -1;
}
} else {
log_error("Internal error: striped target with no stripes");
return 0;
}
return compose_areas_line(dm, seg, params, paramsize, pos, 0u,
seg->area_count);
}
static int _target_present(void)
{
static int checked = 0;
static int present = 0;
if (!checked)
present = target_present("linear") && target_present("striped");
checked = 1;
return present;
}
#endif
static void _destroy(const struct segment_type *segtype)
{
dbg_free((void *) segtype);
}
static struct segtype_handler _striped_ops = {
name:_name,
display:_display,
text_import_area_count:_text_import_area_count,
text_import:_text_import,
text_export:_text_export,
merge_segments:_merge_segments,
#ifdef DEVMAPPER_SUPPORT
compose_target_line:_compose_target_line,
target_present:_target_present,
#endif
destroy:_destroy,
};
struct segment_type *init_striped_segtype(struct cmd_context *cmd)
{
struct segment_type *segtype = dbg_malloc(sizeof(*segtype));
if (!segtype) {
stack;
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;
}
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