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a6ae3edab9
Summary: This change makes it so that all of the C++ code related to the edenfs daemon is now contained in the eden/fs subdirectory. Reviewed By: bolinfest, wez Differential Revision: D4889053 fbshipit-source-id: d0bd4774cc0bdb5d1d6b6f47d716ecae52391f37
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/*
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* Copyright (c) 2016-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 <folly/Optional.h>
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#include <folly/Range.h>
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#include "TreeInode.h"
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#include "eden/fs/utils/DirType.h"
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#include "eden/fs/utils/PathFuncs.h"
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#include "eden/fs/utils/PathMap.h"
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namespace facebook {
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namespace eden {
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namespace overlay {
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class OverlayDir;
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}
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/** Manages the write overlay storage area.
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*
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* The overlay is where we store files that are not yet part of a snapshot.
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*
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* The contents of this storage layer are overlaid on top of the object store
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* snapshot that is active in a given mount point.
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*
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* There is one overlay area associated with each eden client instance.
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*
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* We use the Overlay to manage mutating the structure of the checkout;
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* each time we create or delete a directory entry, we do so through
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* the overlay class.
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*
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* The Overlay class keeps track of the mutated tree; if we mutate some
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* file "foo/bar/baz" then the Overlay records metadata about the list
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* of files in the root, the list of files in "foo", the list of files in
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* "foo/bar" and finally materializes "foo/bar/baz".
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*/
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class Overlay {
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public:
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explicit Overlay(AbsolutePathPiece localDir);
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/** Returns the path to the root of the Overlay storage area */
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const AbsolutePath& getLocalDir() const;
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void saveOverlayDir(fuse_ino_t inodeNumber, const TreeInode::Dir* dir);
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folly::Optional<TreeInode::Dir> loadOverlayDir(fuse_ino_t inodeNumber) const;
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void removeOverlayData(fuse_ino_t inodeNumber) const;
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/**
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* Get the path to the overlay file for the given inode
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*/
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AbsolutePath getFilePath(fuse_ino_t inodeNumber) const;
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/**
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* Get the maximum inode number stored in the overlay.
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*
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* This is called when opening a mount point, to make sure that new inodes
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* handed out from this point forwards are always greater than any inodes
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* already tracked in the overlay.
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*/
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fuse_ino_t getMaxRecordedInode();
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private:
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void initOverlay();
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bool isOldFormatOverlay() const;
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void readExistingOverlay(int infoFD);
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void initNewOverlay();
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folly::Optional<overlay::OverlayDir> deserializeOverlayDir(
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fuse_ino_t inodeNumber) const;
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/** path to ".eden/CLIENT/local" */
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AbsolutePath localDir_;
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};
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}
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}
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