mirror of
git://sourceware.org/git/lvm2.git
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168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
/*
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* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "pool.h"
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#include "list.h"
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#include "toolcontext.h"
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#include "metadata.h"
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#include "segtype.h"
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#include "text_export.h"
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#include "config.h"
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#include "activate.h"
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static const char *_name(const struct lv_segment *seg)
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{
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return seg->segtype->name;
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}
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static int _text_import(struct lv_segment *seg, const struct config_node *sn,
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struct hash_table *pv_hash)
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{
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uint32_t chunk_size;
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const char *org_name, *cow_name;
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struct logical_volume *org, *cow;
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seg->lv->status |= SNAPSHOT;
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if (!get_config_uint32(sn, "chunk_size", &chunk_size)) {
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log_error("Couldn't read chunk size for snapshot.");
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return 0;
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}
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log_suppress(1);
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if (!(cow_name = find_config_str(sn, "cow_store", NULL))) {
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log_suppress(0);
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log_error("Snapshot cow storage not specified.");
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return 0;
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}
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if (!(org_name = find_config_str(sn, "origin", NULL))) {
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log_suppress(0);
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log_error("Snapshot origin not specified.");
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return 0;
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}
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log_suppress(0);
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if (!(cow = find_lv(seg->lv->vg, cow_name))) {
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log_error("Unknown logical volume specified for "
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"snapshot cow store.");
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return 0;
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}
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if (!(org = find_lv(seg->lv->vg, org_name))) {
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log_error("Unknown logical volume specified for "
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"snapshot origin.");
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return 0;
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}
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if (!vg_add_snapshot(org, cow, 1, &seg->lv->lvid.id[1], chunk_size)) {
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stack;
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return 0;
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}
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return 1;
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}
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static int _text_export(const struct lv_segment *seg, struct formatter *f)
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{
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outf(f, "chunk_size = %u", seg->chunk_size);
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outf(f, "origin = \"%s\"", seg->origin->name);
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outf(f, "cow_store = \"%s\"", seg->cow->name);
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return 1;
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}
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#ifdef DEVMAPPER_SUPPORT
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static int _target_percent(void **target_state, struct pool *mem,
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struct config_tree *cft, struct lv_segment *seg,
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char *params, uint64_t *total_numerator,
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uint64_t *total_denominator, float *percent)
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{
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float percent2;
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uint64_t numerator, denominator;
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if (index(params, '/')) {
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if (sscanf(params, "%" PRIu64 "/%" PRIu64,
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&numerator, &denominator) == 2) {
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*total_numerator += numerator;
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*total_denominator += denominator;
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}
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} else if (sscanf(params, "%f", &percent2) == 1) {
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*percent += percent2;
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*percent /= 2;
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}
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return 1;
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}
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static int _target_present(void)
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{
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static int checked = 0;
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static int present = 0;
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if (!checked)
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present = target_present("snapshot") &&
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target_present("snapshot-origin");
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checked = 1;
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return present;
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}
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#endif
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static void _destroy(const struct segment_type *segtype)
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{
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dbg_free((void *) segtype);
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}
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static struct segtype_handler _snapshot_ops = {
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name:_name,
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text_import:_text_import,
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text_export:_text_export,
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#ifdef DEVMAPPER_SUPPORT
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target_percent:_target_percent,
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target_present:_target_present,
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#endif
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destroy:_destroy,
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};
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#ifdef SNAPSHOT_INTERNAL
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struct segment_type *init_snapshot_segtype(struct cmd_context *cmd)
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#else /* Shared */
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struct segment_type *init_segtype(struct cmd_context *cmd);
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struct segment_type *init_segtype(struct cmd_context *cmd)
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#endif
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{
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struct segment_type *segtype = dbg_malloc(sizeof(*segtype));
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if (!segtype) {
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stack;
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return NULL;
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}
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segtype->cmd = cmd;
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segtype->ops = &_snapshot_ops;
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segtype->name = "snapshot";
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segtype->private = NULL;
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segtype->flags = SEG_SNAPSHOT;
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log_very_verbose("Initialised segtype: %s", segtype->name);
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return segtype;
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}
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