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7d4a54eb11
Reviewed By: xavierd Differential Revision: D44716052 fbshipit-source-id: 45bd5d4b1e55792a3f43853dd4decc1faf4a1a9e
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include "eden/fs/inodes/InodeNumber.h"
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#include "eden/fs/nfs/NfsdRpc.h"
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namespace facebook::eden {
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/**
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* Hardcoded static overhead of READDIR3resok before adding any entries.
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* Ideally we should make XdrTrait<T>::serializedSize a constexpr, but some
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* compiler (gcc) don't seem to be able to then compile the code. Thus, this
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* value is hardcoded here and verified in the DirListTest.
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*/
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constexpr size_t kNfsDirListInitialOverhead = 104u;
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/**
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* Abstraction to only add as many directory entries that can fit into a given
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* amount of memory.
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*/
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class NfsDirList {
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public:
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explicit NfsDirList(uint32_t count, nfsv3Procs listType);
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NfsDirList(NfsDirList&&) = default;
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NfsDirList& operator=(NfsDirList&&) = default;
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NfsDirList() = delete;
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NfsDirList(const NfsDirList&) = delete;
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NfsDirList& operator=(const NfsDirList&) = delete;
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/**
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* Add an entry. Return true if the entry was successfully added, false
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* otherwise.
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*/
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bool add(folly::StringPiece name, InodeNumber ino, uint64_t offset);
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/**
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* Move the built list out of the NfsDirList.
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*/
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template <typename T>
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XdrList<T> extractList() {
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return std::get<XdrList<T>>(std::move(list_));
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}
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/**
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* Access the built list via reference. Only implemented for entryplus3
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* since only the entryplus3 implementation will need to fill in stat data.
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*
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* Use this method when you need to modify the NfsDirList's vector of entries.
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*/
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std::vector<entryplus3>& getListRef() {
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return std::get<XdrList<entryplus3>>(list_).list;
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}
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private:
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uint32_t remaining_;
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std::variant<XdrList<entry3>, XdrList<entryplus3>> list_{};
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};
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} // namespace facebook::eden
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