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mirror of git://sourceware.org/git/lvm2.git synced 2024-12-22 17:35:59 +03:00
lvm2/lib/metadata/snapshot_manip.c
2002-02-21 10:16:33 +00:00

111 lines
1.9 KiB
C

/*
* Copyright (C) 2002 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
#include "log.h"
#include "metadata.h"
#include "toolcontext.h"
int lv_is_origin(struct logical_volume *lv)
{
struct list *slh;
struct snapshot *s;
list_iterate (slh, &lv->vg->snapshots) {
s = list_item(slh, struct snapshot_list)->snapshot;
if (s->origin == lv)
return 1;
}
return 0;
}
int lv_is_cow(struct logical_volume *lv)
{
struct list *slh;
struct snapshot *s;
list_iterate (slh, &lv->vg->snapshots) {
s = list_item(slh, struct snapshot_list)->snapshot;
if (s->cow == lv)
return 1;
}
return 0;
}
struct snapshot *find_cow(struct volume_group *vg, struct logical_volume *lv)
{
struct list *slh;
struct snapshot *s;
list_iterate (slh, &vg->snapshots) {
s = list_item(slh, struct snapshot_list)->snapshot;
if (s->cow == lv)
return s;
}
return NULL;
}
int vg_add_snapshot(struct volume_group *vg,
struct logical_volume *origin,
struct logical_volume *cow,
int persistent,
uint32_t chunk_size)
{
struct snapshot *s;
struct snapshot_list *sl;
struct pool *mem = vg->cmd->mem;
/*
* Is the cow device already being used ?
*/
if (lv_is_cow(cow)) {
log_err("'%s' is already in use as a snapshot.", cow->name);
return 0;
}
if (!(s = pool_alloc(mem, sizeof(*s)))) {
stack;
return 0;
}
s->persistent = persistent;
s->chunk_size = chunk_size;
s->origin = origin;
s->cow = cow;
if (!(sl = pool_alloc(mem, sizeof(*sl)))) {
stack;
pool_free(mem, s);
return 0;
}
sl->snapshot = s;
list_add(&vg->snapshots, &sl->list);
return 1;
}
int vg_remove_snapshot(struct volume_group *vg, struct logical_volume *cow)
{
struct list *slh;
struct snapshot_list *sl;
list_iterate (slh, &vg->snapshots) {
sl = list_item(slh, struct snapshot_list);
if (sl->snapshot->cow == cow) {
list_del(slh);
return 1;
}
}
/* fail */
log_err("Asked to remove an unknown snapshot.");
return 0;
}