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/*
* Copyright (c) 2008, XenSource Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of XenSource Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "lvm-util.h"
#define EPRINTF(_f, _a...) \
do { \
syslog(LOG_INFO, "%s: " _f, __func__, ##_a); \
} while (0)
#define _NAME "%255s"
static char line[1024];
static inline int
lvm_read_line(FILE *scan)
{
memset(line, 0, sizeof(line));
return (fscanf(scan, "%1023[^\n]", line) != 1);
}
static inline int
lvm_next_line(FILE *scan)
{
return (fscanf(scan, "%1023[\n]", line) != 1);
}
static int
lvm_copy_name(char *dst, const char *src, size_t size)
{
if (strnlen(src, size) == size)
return -ENAMETOOLONG;
strcpy(dst, src);
return 0;
}
static int
lvm_parse_pv(struct vg *vg, const char *name, int pvs, uint64_t start)
{
int i, err;
struct pv *pv;
pv = NULL;
if (!vg->pvs) {
vg->pvs = calloc(pvs, sizeof(struct pv));
if (!vg->pvs)
return -ENOMEM;
}
for (i = 0; i < pvs; i++) {
pv = vg->pvs + i;
if (!pv->name[0])
break;
if (!strcmp(pv->name, name))
return -EEXIST;
}
if (!pv)
return -ENOENT;
if (i == pvs)
return -ENOMEM;
err = lvm_copy_name(pv->name, name, sizeof(pv->name) - 1);
if (err)
return err;
pv->start = start;
return 0;
}
static int
lvm_open_vg(const char *vgname, struct vg *vg)
{
FILE *scan;
int i, err, pvs, lvs;
char *cmd, pvname[256];
uint64_t size, pv_start;
memset(vg, 0, sizeof(*vg));
err = asprintf(&cmd, "/sbin/vgs %s --noheadings --nosuffix --units=b "
"--options=vg_name,vg_extent_size,lv_count,pv_count,"
"pv_name,pe_start --unbuffered 2> /dev/null", vgname);
if (err == -1)
return -ENOMEM;
errno = 0;
scan = popen(cmd, "r");
if (!scan) {
err = (errno ? -errno : ENOMEM);
goto out;
}
for (;;) {
if (lvm_read_line(scan))
break;
err = -EINVAL;
if (sscanf(line, _NAME" %"PRIu64" %d %d "_NAME" %"PRIu64, vg->name,
&size, &lvs, &pvs, pvname, &pv_start) != 6) {
EPRINTF("sscanf failed on '%s'\n", line);
goto out;
}
if (strcmp(vg->name, vgname)) {
EPRINTF("VG name '%s' != '%s'\n", vg->name, vgname);
goto out;
}
err = lvm_parse_pv(vg, pvname, pvs, pv_start);
if (err)
goto out;
if (lvm_next_line(scan))
break;
}
err = -EINVAL;
if (strcmp(vg->name, vgname)) {
EPRINTF("VG name '%s' != '%s'\n", vg->name, vgname);
goto out;
}
for (i = 0; i < pvs; i++)
if (!vg->pvs[i].name[0]) {
EPRINTF("pvs %d name empty\n", i);
goto out;
}
err = -ENOMEM;
vg->lvs = calloc(lvs, sizeof(struct lv));
if (!vg->lvs)
goto out;
err = 0;
vg->lv_cnt = lvs;
vg->pv_cnt = pvs;
vg->extent_size = size;
out:
if (scan)
pclose(scan);
if (err)
lvm_free_vg(vg);
free(cmd);
return err;
}
static int
lvm_parse_lv_devices(struct vg *vg, struct lv_segment *seg, char *devices)
{
int i;
uint64_t start, pe_start;
for (i = 0; i < strlen(devices); i++)
if (strchr(",()", devices[i]))
devices[i] = ' ';
if (sscanf(devices, _NAME" %"PRIu64, seg->device, &start) != 2) {
EPRINTF("sscanf failed on '%s'\n", devices);
return -EINVAL;
}
pe_start = -1;
for (i = 0; i < vg->pv_cnt; i++)
if (!strcmp(vg->pvs[i].name, seg->device)) {
pe_start = vg->pvs[i].start;
break;
}
if (pe_start == -1) {
EPRINTF("invalid pe_start value\n");
return -EINVAL;
}
seg->pe_start = (start * vg->extent_size) + pe_start;
return 0;
}
static int
lvm_scan_lvs(struct vg *vg)
{
char *cmd;
FILE *scan;
int i, err;
err = asprintf(&cmd, "/sbin/lvs %s --noheadings --nosuffix --units=b "
"--options=lv_name,lv_size,segtype,seg_count,seg_start,"
"seg_size,devices --unbuffered 2> /dev/null", vg->name);
if (err == -1)
return -ENOMEM;
errno = 0;
scan = popen(cmd, "r");
if (!scan) {
err = (errno ? -errno : -ENOMEM);
goto out;
}
for (i = 0;;) {
int segs;
struct lv *lv;
struct lv_segment seg;
unsigned long long size, seg_start;
char type[32], name[256], devices[1024];
if (i >= vg->lv_cnt)
break;
if (lvm_read_line(scan)) {
vg->lv_cnt = i;
break;
}
err = -EINVAL;
lv = vg->lvs + i;
if (sscanf(line, _NAME" %llu %31s %u %llu %"PRIu64" %1023s",
name, &size, type, &segs, &seg_start,
&seg.pe_size, devices) != 7) {
EPRINTF("sscanf failed on '%s'\n", line);
goto out;
}
if (seg_start)
goto next;
if (!strcmp(type, "linear"))
seg.type = LVM_SEG_TYPE_LINEAR;
else
seg.type = LVM_SEG_TYPE_UNKNOWN;
if (lvm_parse_lv_devices(vg, &seg, devices))
goto out;
i++;
lv->size = size;
lv->segments = segs;
lv->first_segment = seg;
err = lvm_copy_name(lv->name, name, sizeof(lv->name) - 1);
if (err)
goto out;
err = -EINVAL;
next:
if (lvm_next_line(scan)) {
if (err)
EPRINTF("fscanf failed\n");
goto out;
}
}
err = 0;
out:
if (scan)
pclose(scan);
free(cmd);
return err;
}
void
lvm_free_vg(struct vg *vg)
{
free(vg->lvs);
free(vg->pvs);
memset(vg, 0, sizeof(*vg));
}
int
lvm_scan_vg(const char *vg_name, struct vg *vg)
{
int err;
memset(vg, 0, sizeof(*vg));
err = lvm_open_vg(vg_name, vg);
if (err)
return err;
err = lvm_scan_lvs(vg);
if (err) {
lvm_free_vg(vg);
return err;
}
return 0;
}
#ifdef LVM_UTIL
static int
usage(void)
{
printf("usage: lvm-util <vgname>\n");
exit(EINVAL);
}
int
main(int argc, char **argv)
{
int i, err;
struct vg vg;
struct pv *pv;
struct lv *lv;
struct lv_segment *seg;
if (argc != 2)
usage();
err = lvm_scan_vg(argv[1], &vg);
if (err) {
printf("scan failed: %d\n", err);
return (err >= 0 ? err : -err);
}
printf("vg %s: extent_size: %"PRIu64", pvs: %d, lvs: %d\n",
vg.name, vg.extent_size, vg.pv_cnt, vg.lv_cnt);
for (i = 0; i < vg.pv_cnt; i++) {
pv = vg.pvs + i;
printf("pv %s: start %"PRIu64"\n", pv->name, pv->start);
}
for (i = 0; i < vg.lv_cnt; i++) {
lv = vg.lvs + i;
seg = &lv->first_segment;
printf("lv %s: size: %"PRIu64", segments: %u, type: %u, "
"dev: %s, pe_start: %"PRIu64", pe_size: %"PRIu64"\n",
lv->name, lv->size, lv->segments, seg->type,
seg->device, seg->pe_start, seg->pe_size);
}
lvm_free_vg(&vg);
return 0;
}
#endif
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