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7335196fed
Summary: This gets rid of those pesky #ifdefs in FileInode.cpp and TreeInode.cpp. Reviewed By: wez Differential Revision: D7735914 fbshipit-source-id: d810461984e21f72670f43ca2d1b4f5aacbf376e
143 lines
3.2 KiB
C++
143 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#pragma once
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#include "eden/fs/utils/TimeUtil.h"
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#include <stdint.h>
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#include <time.h>
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struct fuse_setattr_in;
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struct stat;
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namespace facebook {
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namespace eden {
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class Clock;
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/**
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* For space efficiency, store timestamps in a single 64-bit value as
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* nanoseconds from 1901-12-13 (-0x80000000 seconds before unix epoch) through
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* 2446. This range is similar to ext4's timestamp range, though slightly
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* larger.
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*
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* https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout#Inode_Timestamps
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*/
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class EdenTimestamp {
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public:
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constexpr static struct Clamp {
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} clamp{};
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constexpr static struct ThrowIfOutOfRange {
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} throwIfOutOfRange{};
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/**
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* Default construction produces a timestamp at EdenTimestamp's earliest
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* representable value.
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*/
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EdenTimestamp() = default;
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EdenTimestamp(const EdenTimestamp&) = default;
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/**
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* Constructs an EdenTimestamp given a raw uint64_t in nanoseconds since
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* the earliest representable ext4 timestamp.
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*/
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explicit EdenTimestamp(uint64_t nsec) : nsec_(nsec) {}
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/**
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* Converts a timespec to an EdenTimestamp.
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*
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* If the timespec is out of range, it is clamped.
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*/
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explicit EdenTimestamp(timespec ts, Clamp = clamp);
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/**
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* Converts a timespec to an EdenTimestamp.
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*
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* If the timespec is out of range, std::overflow_error or
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* std::underflow_error is thrown.
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*/
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EdenTimestamp(timespec ts, ThrowIfOutOfRange);
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EdenTimestamp& operator=(const EdenTimestamp&) = default;
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EdenTimestamp& operator=(timespec ts) {
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return *this = EdenTimestamp{ts};
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}
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bool operator<(EdenTimestamp ts) const {
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return nsec_ < ts.nsec_;
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}
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bool operator<(timespec ts) const {
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return toTimespec() < ts;
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}
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/**
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* Returns a timespec representing duration since the unix epoch.
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*/
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timespec toTimespec() const;
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/**
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* Returns the raw representation -- should be for testing only. :)
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*/
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uint64_t asRawRepresentation() const {
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return nsec_;
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}
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private:
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uint64_t nsec_{0};
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};
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/**
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* Structure for wrapping atime,ctime,mtime
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*/
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struct InodeTimestamps {
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EdenTimestamp atime{};
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EdenTimestamp mtime{};
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EdenTimestamp ctime{};
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/**
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* Initializes all timestamps to zero.
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*/
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InodeTimestamps() {}
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/**
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* Initializes all timestamps from the same value.
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*/
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explicit InodeTimestamps(const timespec& ts)
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: atime(ts), mtime(ts), ctime(ts) {}
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/**
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* Assigns the specified ts to atime, mtime, and ctime.
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*/
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void setAll(const timespec& ts) {
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atime = ts;
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mtime = ts;
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ctime = ts;
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}
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/**
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* Helper that assigns all three timestamps from the flags and parameters in
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* a fuse_setattr_in struct.
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*
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* Always sets ctime to the current time as given by the clock.
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*/
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void setattrTimes(const Clock& clock, const fuse_setattr_in& attr);
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/**
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* Updates st_atime, st_mtime, and st_ctime of the given stat struct.
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*/
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void applyToStat(struct stat& st) const;
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};
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} // namespace eden
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} // namespace facebook
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