mirror of
https://github.com/facebook/sapling.git
synced 2024-10-05 14:28:17 +03:00
04c2b8b54c
Summary: I'm getting nfs to build on windows to prototype it and see how feasible it might be as an option on Windows. PrjFS has a very different model than EdenFS, and that has made EdenFS correctness on Windows very difficult. NFS may be easier to get correct, though the performance is suspect. Just exploring options here. After this change NFS builds on Windows! NOTE: this one is more than removing ifdefs, probably the most non trivial in the stack, please review carefully Reviewed By: xavierd Differential Revision: D44153443 fbshipit-source-id: b07e19f8bde1aa455eec97647ea450849133041f
86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
/*
|
|
* Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
*
|
|
* This software may be used and distributed according to the terms of the
|
|
* GNU General Public License version 2.
|
|
*/
|
|
|
|
#include "eden/fs/nfs/NfsDirList.h"
|
|
#include <variant>
|
|
#include "eden/fs/nfs/NfsdRpc.h"
|
|
|
|
namespace facebook::eden {
|
|
|
|
namespace {
|
|
|
|
/**
|
|
* NFS is weird, it specifies the maximum amount of entries to be returned by
|
|
* passing the total size of the READDIR3resok structure, therefore we need to
|
|
* account for all the overhead.
|
|
*/
|
|
uint32_t computeInitialRemaining(uint32_t count) {
|
|
if (kNfsDirListInitialOverhead > count) {
|
|
throw std::length_error(
|
|
"NFS READDIR overhead is bigger than the passed in size");
|
|
}
|
|
return count - kNfsDirListInitialOverhead;
|
|
}
|
|
|
|
std::variant<XdrList<entry3>, XdrList<entryplus3>> computeListType(
|
|
nfsv3Procs listType) {
|
|
switch (listType) {
|
|
case nfsv3Procs::readdirplus:
|
|
return std::variant<XdrList<entry3>, XdrList<entryplus3>>(
|
|
std::in_place_type<XdrList<entryplus3>>);
|
|
case nfsv3Procs::readdir:
|
|
default:
|
|
return std::variant<XdrList<entry3>, XdrList<entryplus3>>(
|
|
std::in_place_type<XdrList<entry3>>);
|
|
}
|
|
}
|
|
|
|
} // namespace
|
|
|
|
NfsDirList::NfsDirList(uint32_t count, nfsv3Procs listType)
|
|
: remaining_(computeInitialRemaining(count)),
|
|
list_(computeListType(listType)) {}
|
|
|
|
bool NfsDirList::add(
|
|
folly::StringPiece name,
|
|
InodeNumber ino,
|
|
uint64_t offset) {
|
|
auto fn = [name, ino, offset](auto&& list, uint32_t& remainingSize) {
|
|
size_t neededSize;
|
|
using ListType = std::decay_t<decltype(list->list)>;
|
|
using EntryT = typename ListType::value_type;
|
|
|
|
// For entryplus3s, we initially add an empty post_op_attr. This is
|
|
// because we don't have access to stat data in this layer. In a
|
|
// separate layer, we will fill in the post_op_attr with the
|
|
// appropriate stat data. For entry3s, we don't need this extra data.
|
|
EntryT entry = EntryT{ino, name.str(), offset};
|
|
|
|
// The serialized size includes a boolean indicating that this is not
|
|
// the end of the list.
|
|
neededSize = XdrTrait<EntryT>::serializedSize(entry) +
|
|
XdrTrait<bool>::serializedSize(true);
|
|
|
|
if (neededSize > remainingSize) {
|
|
return false;
|
|
}
|
|
|
|
remainingSize -= neededSize;
|
|
list->list.push_back(std::move(entry));
|
|
return true;
|
|
};
|
|
|
|
if (XdrList<entryplus3>* list = std::get_if<XdrList<entryplus3>>(&list_)) {
|
|
return fn(list, remaining_);
|
|
} else {
|
|
XdrList<entry3>* entry3List = &std::get<XdrList<entry3>>(list_);
|
|
return fn(entry3List, remaining_);
|
|
}
|
|
}
|
|
|
|
} // namespace facebook::eden
|