1 files changed, 89 insertions, 0 deletions
diff --git a/src/common/blkdev.h b/src/common/blkdev.h
new file mode 100644
index 000000000..f8b089b0c
--- /dev/null
+++ b/src/common/blkdev.h
@@ -0,0 +1,89 @@
+// -*- 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