diff options
Diffstat (limited to 'include/llfio/v2.0/statfs.hpp')
| -rw-r--r-- | include/llfio/v2.0/statfs.hpp | 59 |
1 files changed, 55 insertions, 4 deletions
diff --git a/include/llfio/v2.0/statfs.hpp b/include/llfio/v2.0/statfs.hpp index 71732da5..c8af2fde 100644 --- a/include/llfio/v2.0/statfs.hpp +++ b/include/llfio/v2.0/statfs.hpp @@ -1,5 +1,5 @@ /* Information about the volume storing a file -(C) 2015-2017 Niall Douglas <http://www.nedproductions.biz/> (8 commits) +(C) 2015-2020 Niall Douglas <http://www.nedproductions.biz/> (8 commits) File Created: Dec 2015 @@ -41,13 +41,40 @@ LLFIO_V2_NAMESPACE_EXPORT_BEGIN class handle; +namespace detail +{ + inline constexpr float constexpr_float_allbits_set_nan() + { +#if defined(_MSC_VER) && !defined(__clang__) + // Not all bits 1, but I can't see how to do better whilst inside constexpr + return -NAN; +#else + return -__builtin_nanf("0xffffff"); // all bits 1 +#endif + } +} // namespace detail + /*! \struct statfs_t \brief Metadata about a filing system. Unsupported entries are all bits set. + +Note also that for some fields, a soft failure to read the requested value manifests +as all bits set. For example, `f_iosinprogress` might not be computable if the +filing system for your handle reports a `dev_t` from `fstat()` which does not +match anything in the system's disk hardware i/o stats. As this can be completely +benign (e.g. your handle is a socket), this is treated as a soft failure. + +Note for `f_iosinprogress` and `f_iosbusytime` that support is not implemented yet +outside Microsoft Windows and Linux. Note also that for Linux, filing systems +spanning multiple hardware devices have undefined outcomes, whereas on Windows +you are given the average of the values for all underlying hardware devices. +Code donations improving the support for these items on Mac OS, FreeBSD and Linux +would be welcomed. */ struct LLFIO_DECL statfs_t { static constexpr uint32_t _allbits1_32 = ~0U; static constexpr uint64_t _allbits1_64 = ~0ULL; + static constexpr float _allbits1_float = detail::constexpr_float_allbits_set_nan(); struct f_flags_t { uint32_t rdonly : 1; //!< Filing system is read only (Windows, POSIX) @@ -75,11 +102,31 @@ struct LLFIO_DECL statfs_t std::string f_mntfromname; /*!< mounted filesystem (Windows, POSIX) */ filesystem::path f_mntonname; /*!< directory on which mounted (Windows, POSIX) */ + uint32_t f_iosinprogress{_allbits1_32}; /*!< i/o's currently in progress (i.e. queue depth) (Windows, Linux) */ + float f_iosbusytime{_allbits1_float}; /*!< percentage of time spent doing i/o (1.0 = 100%) (Windows, Linux) */ + //! Used to indicate what metadata should be filled in - QUICKCPPLIB_BITFIELD_BEGIN(want) { flags = 1 << 0, bsize = 1 << 1, iosize = 1 << 2, blocks = 1 << 3, bfree = 1 << 4, bavail = 1 << 5, files = 1 << 6, ffree = 1 << 7, namemax = 1 << 8, owner = 1 << 9, fsid = 1 << 10, fstypename = 1 << 11, mntfromname = 1 << 12, mntonname = 1 << 13, all = static_cast<unsigned>(-1) } - QUICKCPPLIB_BITFIELD_END(want) + QUICKCPPLIB_BITFIELD_BEGIN(want){flags = 1 << 0, + bsize = 1 << 1, + iosize = 1 << 2, + blocks = 1 << 3, + bfree = 1 << 4, + bavail = 1 << 5, + files = 1 << 6, + ffree = 1 << 7, + namemax = 1 << 8, + owner = 1 << 9, + fsid = 1 << 10, + fstypename = 1 << 11, + mntfromname = 1 << 12, + mntonname = 1 << 13, + iosinprogress = 1 << 14, + iosbusytime = 1 << 15, + all = static_cast<unsigned>(-1)} QUICKCPPLIB_BITFIELD_END(want) //! Constructs a default initialised instance (all bits set) - statfs_t() {} // NOLINT Cannot be constexpr due to lack of constexpe string default constructor :( + statfs_t() + { + } // NOLINT Cannot be constexpr due to lack of constexpe string default constructor :( #ifdef __cpp_exceptions //! Constructs a filled instance, throwing as an exception any error which might occur explicit statfs_t(const handle &h, want wanted = want::all) @@ -94,6 +141,10 @@ struct LLFIO_DECL statfs_t #endif //! Fills in the structure with metadata, returning number of items filled in LLFIO_HEADERS_ONLY_MEMFUNC_SPEC result<size_t> fill(const handle &h, want wanted = want::all) noexcept; + +private: + // Implemented in file_handle.ipp on Windows, otherwise in statfs.ipp + static LLFIO_HEADERS_ONLY_MEMFUNC_SPEC result<std::pair<uint32_t, float>> _fill_ios(const handle &h, const std::string &mntfromname) noexcept; }; LLFIO_V2_NAMESPACE_END |