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lvm2/lib/snapshot/snapshot.c
2005-01-27 15:48:49 +00:00

169 lines
3.8 KiB
C

/*
* 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 "metadata.h"
#include "segtype.h"
#include "text_export.h"
#include "config.h"
#include "activate.h"
static const char *_name(const struct lv_segment *seg)
{
return seg->segtype->name;
}
static int _text_import(struct lv_segment *seg, const struct config_node *sn,
struct hash_table *pv_hash)
{
uint32_t chunk_size;
const char *org_name, *cow_name;
struct logical_volume *org, *cow;
seg->lv->status |= SNAPSHOT;
if (!get_config_uint32(sn, "chunk_size", &chunk_size)) {
log_error("Couldn't read chunk size for snapshot.");
return 0;
}
log_suppress(1);
if (!(cow_name = find_config_str(sn, "cow_store", NULL))) {
log_suppress(0);
log_error("Snapshot cow storage not specified.");
return 0;
}
if (!(org_name = find_config_str(sn, "origin", NULL))) {
log_suppress(0);
log_error("Snapshot origin not specified.");
return 0;
}
log_suppress(0);
if (!(cow = find_lv(seg->lv->vg, cow_name))) {
log_error("Unknown logical volume specified for "
"snapshot cow store.");
return 0;
}
if (!(org = find_lv(seg->lv->vg, org_name))) {
log_error("Unknown logical volume specified for "
"snapshot origin.");
return 0;
}
if (!vg_add_snapshot(org, cow, 1, &seg->lv->lvid.id[1], seg->len,
chunk_size)) {
stack;
return 0;
}
return 1;
}
static int _text_export(const struct lv_segment *seg, struct formatter *f)
{
outf(f, "chunk_size = %u", seg->chunk_size);
outf(f, "origin = \"%s\"", seg->origin->name);
outf(f, "cow_store = \"%s\"", seg->cow->name);
return 1;
}
#ifdef DEVMAPPER_SUPPORT
static int _target_percent(void **target_state, struct pool *mem,
struct config_tree *cft, struct lv_segment *seg,
char *params, uint64_t *total_numerator,
uint64_t *total_denominator, float *percent)
{
float percent2;
uint64_t numerator, denominator;
if (index(params, '/')) {
if (sscanf(params, "%" PRIu64 "/%" PRIu64,
&numerator, &denominator) == 2) {
*total_numerator += numerator;
*total_denominator += denominator;
}
} else if (sscanf(params, "%f", &percent2) == 1) {
*percent += percent2;
*percent /= 2;
}
return 1;
}
static int _target_present(void)
{
static int checked = 0;
static int present = 0;
if (!checked)
present = target_present("snapshot") &&
target_present("snapshot-origin");
checked = 1;
return present;
}
#endif
static void _destroy(const struct segment_type *segtype)
{
dbg_free((void *) segtype);
}
static struct segtype_handler _snapshot_ops = {
name:_name,
text_import:_text_import,
text_export:_text_export,
#ifdef DEVMAPPER_SUPPORT
target_percent:_target_percent,
target_present:_target_present,
#endif
destroy:_destroy,
};
#ifdef SNAPSHOT_INTERNAL
struct segment_type *init_snapshot_segtype(struct cmd_context *cmd)
#else /* Shared */
struct segment_type *init_segtype(struct cmd_context *cmd);
struct segment_type *init_segtype(struct cmd_context *cmd)
#endif
{
struct segment_type *segtype = dbg_malloc(sizeof(*segtype));
if (!segtype) {
stack;
return NULL;
}
segtype->cmd = cmd;
segtype->ops = &_snapshot_ops;
segtype->name = "snapshot";
segtype->private = NULL;
segtype->flags = SEG_SNAPSHOT;
log_very_verbose("Initialised segtype: %s", segtype->name);
return segtype;
}