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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* (C) Copyright IBM Corporation 2022
* Author: Martin Ohmacht <mohmacht@us.ibm.com>
*
* Based on the file ceph/src/common/blkdev.cc
* Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "ExtBlkDevVdo.h"
#include "common/blkdev.h"
#include "include/stringify.h"
#include <errno.h>
#include "common/debug.h"
#define dout_subsys ceph_subsys_bdev
#define dout_context cct
#undef dout_prefix
#define dout_prefix *_dout << "vdo(" << this << ") "
int ExtBlkDevVdo::_get_vdo_stats_handle(const std::string& devname)
{
int rc = -ENOENT;
dout(10) << __func__ << " VDO init checking device: " << devname << dendl;
// we need to go from the raw devname (e.g., dm-4) to the VDO volume name.
// currently the best way seems to be to look at /dev/mapper/* ...
std::string expect = std::string("../") + devname; // expected symlink target
DIR *dir = ::opendir("/dev/mapper");
if (!dir) {
return -errno;
}
struct dirent *de = nullptr;
while ((de = ::readdir(dir))) {
if (de->d_name[0] == '.')
continue;
char fn[4096], target[4096];
snprintf(fn, sizeof(fn), "/dev/mapper/%s", de->d_name);
int r = readlink(fn, target, sizeof(target));
if (r < 0 || r >= (int)sizeof(target))
continue;
target[r] = 0;
if (expect == target) {
snprintf(fn, sizeof(fn), "/sys/kvdo/%s/statistics", de->d_name);
int vdo_fd = ::open(fn, O_RDONLY|O_CLOEXEC);
if (vdo_fd >= 0) {
name = de->d_name;
vdo_dir_fd = vdo_fd;
rc = 0;
break;
}
}
}
closedir(dir);
return rc;
}
int ExtBlkDevVdo::get_vdo_stats_handle()
{
std::set<std::string> devs = { logdevname };
while (!devs.empty()) {
std::string dev = *devs.begin();
devs.erase(devs.begin());
int rc = _get_vdo_stats_handle(dev);
if (rc == 0) {
// yay, it's vdo
return rc;
}
// ok, see if there are constituent devices
if (dev.find("dm-") == 0) {
get_dm_parents(dev, &devs);
}
}
return -ENOENT;
}
int64_t ExtBlkDevVdo::get_vdo_stat(const char *property)
{
int64_t ret = 0;
int fd = ::openat(vdo_dir_fd, property, O_RDONLY|O_CLOEXEC);
if (fd < 0) {
return 0;
}
char buf[1024];
int r = ::read(fd, buf, sizeof(buf) - 1);
if (r > 0) {
buf[r] = 0;
ret = atoll(buf);
}
VOID_TEMP_FAILURE_RETRY(::close(fd));
return ret;
}
int ExtBlkDevVdo::init(const std::string& alogdevname)
{
logdevname = alogdevname;
// get directory handle for VDO metadata
return get_vdo_stats_handle();
}
int ExtBlkDevVdo::get_state(ceph::ExtBlkDevState& state)
{
int64_t block_size = get_vdo_stat("block_size");
int64_t physical_blocks = get_vdo_stat("physical_blocks");
int64_t overhead_blocks_used = get_vdo_stat("overhead_blocks_used");
int64_t data_blocks_used = get_vdo_stat("data_blocks_used");
int64_t logical_blocks = get_vdo_stat("logical_blocks");
int64_t logical_blocks_used = get_vdo_stat("logical_blocks_used");
if (!block_size
|| !physical_blocks
|| !overhead_blocks_used
|| !data_blocks_used
|| !logical_blocks) {
dout(1) << __func__ << " VDO sysfs provided zero value for at least one statistic: " << dendl;
dout(1) << __func__ << " VDO block_size: " << block_size << dendl;
dout(1) << __func__ << " VDO physical_blocks: " << physical_blocks << dendl;
dout(1) << __func__ << " VDO overhead_blocks_used: " << overhead_blocks_used << dendl;
dout(1) << __func__ << " VDO data_blocks_used: " << data_blocks_used << dendl;
dout(1) << __func__ << " VDO logical_blocks: " << logical_blocks << dendl;
return -1;
}
int64_t avail_blocks =
physical_blocks - overhead_blocks_used - data_blocks_used;
int64_t logical_avail_blocks =
logical_blocks - logical_blocks_used;
state.set_logical_total(block_size * logical_blocks);
state.set_logical_avail(block_size * logical_avail_blocks);
state.set_physical_total(block_size * physical_blocks);
state.set_physical_avail(block_size * avail_blocks);
return 0;
}
int ExtBlkDevVdo::collect_metadata(const std::string& prefix, std::map<std::string,std::string> *pm)
{
ceph::ExtBlkDevState state;
int rc = get_state(state);
if(rc != 0){
return rc;
}
(*pm)[prefix + "vdo"] = "true";
(*pm)[prefix + "vdo_physical_size"] = stringify(state.get_physical_total());
return 0;
}
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