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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef __CEPH_COMMON_BLKDEV_H
#define __CEPH_COMMON_BLKDEV_H
#include <set>
#include <map>
#include <string>
#include "json_spirit/json_spirit_value.h"
extern int get_device_by_path(const char *path, char* partition, char* device, size_t max);
extern std::string _decode_model_enc(const std::string& in); // helper, exported only so we can unit test
// get $vendor_$model_$serial style device id
extern std::string get_device_id(const std::string& devname,
std::string *err=0);
// get /dev/disk/by-path/... style device id that is stable for a disk slot across reboots etc
extern std::string get_device_path(const std::string& devname,
std::string *err=0);
// populate daemon metadata map with device info
extern void get_device_metadata(
const std::set<std::string>& devnames,
std::map<std::string,std::string> *pm,
std::map<std::string,std::string> *errs);
extern void get_dm_parents(const std::string& dev, std::set<std::string> *ls);
extern int block_device_get_metrics(const std::string& devname, int timeout,
json_spirit::mValue *result);
// do everything to translate a device to the raw physical devices that
// back it, including partitions -> wholedisks and dm -> constituent devices.
extern void get_raw_devices(const std::string& in,
std::set<std::string> *ls);
// for VDO
/// return an op fd for the sysfs stats dir, if this is a VDO device
extern int get_vdo_stats_handle(const char *devname, std::string *vdo_name);
extern int64_t get_vdo_stat(int fd, const char *property);
extern bool get_vdo_utilization(int fd, uint64_t *total, uint64_t *avail);
class BlkDev {
public:
BlkDev(int fd);
BlkDev(const std::string& devname);
/* GoogleMock requires a virtual destructor */
virtual ~BlkDev() {}
// from an fd
int discard(int64_t offset, int64_t len) const;
int get_size(int64_t *psize) const;
int get_devid(dev_t *id) const;
int partition(char* partition, size_t max) const;
// from a device (e.g., "sdb")
bool support_discard() const;
bool is_rotational() const;
int get_numa_node(int *node) const;
int dev(char *dev, size_t max) const;
int vendor(char *vendor, size_t max) const;
int model(char *model, size_t max) const;
int serial(char *serial, size_t max) const;
/* virtual for testing purposes */
virtual const char *sysfsdir() const;
virtual int wholedisk(char* device, size_t max) const;
int wholedisk(std::string *s) const {
char out[PATH_MAX] = {0};
int r = wholedisk(out, sizeof(out));
if (r < 0) {
return r;
}
*s = out;
return r;
}
protected:
int64_t get_int_property(const char* prop) const;
int64_t get_string_property(const char* prop, char *val,
size_t maxlen) const;
private:
int fd = -1;
std::string devname;
};
#endif
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