FSFile.h

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#ifndef STORAGE_FSFILE_H
#define STORAGE_FSFILE_H
 
#include "tdb.h"
 
namespace taco {
 
class FSFile {
public:
    static FSFile *Open(const std::string& path, bool o_trunc,
                        bool o_direct, bool o_creat,
                        mode_t mode = 0600);
 
    ~FSFile();
 
    bool Reopen();
 
    void Close();
 
    bool IsOpen() const;
 
    void Delete() const;
 
    void Read(void *buf, size_t count, off_t offset);
 
    void Write(const void *buf, size_t count, off_t offset);
 
    void Allocate(size_t count);
 
    size_t Size() const noexcept;
 
    void Flush();
 
private:
    FSFile(const std::string &path, int fd, size_t flen, bool o_direct):
        m_path(path),
        m_o_direct(o_direct),
        m_fd(fd),
        m_flen(flen) {}
 
    void ReadImpl(void *buf, size_t count, off_t offset);
 
    void WriteImpl(const void *buf, size_t count, off_t offset);
 
    std::string     m_path;
    bool            m_o_direct;
    int             m_fd;
    atomic_size_t   m_flen;
};
 
bool fallocate_zerofill_fast(int fd, off_t offset, off_t len);
 
}   // namespace taco
 
#endif      // STORAGE_FSFILE_H