mirror of
git://sourceware.org/git/lvm2.git
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97 lines
1.7 KiB
C
97 lines
1.7 KiB
C
/*
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* Copyright (C) 2002 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*/
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#include "log.h"
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#include "metadata.h"
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#include "toolcontext.h"
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int lv_is_origin(struct logical_volume *lv)
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{
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struct list *slh;
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struct snapshot *s;
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list_iterate (slh, &lv->vg->snapshots) {
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s = list_item(slh, struct snapshot_list)->snapshot;
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if (s->origin == lv)
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return 1;
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}
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return 0;
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}
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int lv_is_cow(struct logical_volume *lv)
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{
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struct list *slh;
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struct snapshot *s;
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list_iterate (slh, &lv->vg->snapshots) {
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s = list_item(slh, struct snapshot_list)->snapshot;
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if (s->cow == lv)
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return 1;
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}
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return 0;
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}
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int vg_add_snapshot(struct volume_group *vg,
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struct logical_volume *origin,
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struct logical_volume *cow,
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int persistent,
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uint32_t chunk_size)
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{
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struct snapshot *s;
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struct snapshot_list *sl;
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struct pool *mem = vg->cmd->mem;
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/*
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* Is the cow device already being used ?
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*/
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if (lv_is_cow(cow)) {
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log_err("'%s' is already in use as a snapshot.", cow->name);
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return 0;
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}
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if (!(s = pool_alloc(mem, sizeof(*s)))) {
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stack;
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return 0;
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}
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s->persistent = persistent;
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s->chunk_size = chunk_size;
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s->origin = origin;
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s->cow = cow;
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if (!(sl = pool_alloc(mem, sizeof(*sl)))) {
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stack;
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pool_free(mem, s);
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return 0;
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}
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sl->snapshot = s;
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list_add(&vg->snapshots, &sl->list);
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return 1;
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}
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int vg_remove_snapshot(struct volume_group *vg, struct logical_volume *cow)
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{
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struct list *slh;
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struct snapshot_list *sl;
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list_iterate (slh, &vg->snapshots) {
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sl = list_item(slh, struct snapshot_list);
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if (sl->snapshot->cow == cow) {
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list_del(slh);
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return 1;
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}
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}
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/* fail */
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log_err("Asked to remove an unknown snapshot.");
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return 0;
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}
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