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9c79b74456
Summary: we now serialize the overlay data for each directory independently. When we mount, we try to load the root overlay data. The children are lazy loaded as the inodes are instantiated. Structural changes cause the overlay data for the impacted dirs to get saved out. I need to make a pass over this to fixup comments and so on, I just wanted to get this diff out first. I moved the overlay stuff from `eden/fs/overlay` -> `eden/fs/inodes` since most of the overlay-ness is handled in `TreeInode` now; the `Overlay` class is really just for carrying around the paths and providing the serialization helpers. Reviewed By: simpkins Differential Revision: D3787108 fbshipit-source-id: f0e089a829defd953535b9d0a96b102ac729261b
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
/*
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* Copyright (c) 2016, 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/File.h>
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#include <folly/Optional.h>
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#include <folly/String.h>
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#include <map>
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#include "TreeInode.h"
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#include "eden/utils/DirType.h"
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#include "eden/utils/PathFuncs.h"
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#include "eden/utils/PathMap.h"
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namespace facebook {
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namespace eden {
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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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/** Returns the path to the root of the materialized tree.
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* This is a sub-directory of the local dir */
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const AbsolutePath& getContentDir() const;
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void saveOverlayDir(RelativePathPiece path, const TreeInode::Dir* dir) const;
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void removeOverlayDir(RelativePathPiece path) const;
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folly::Optional<TreeInode::Dir> loadOverlayDir(RelativePathPiece path) const;
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private:
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/** path to ".eden/CLIENT/local" */
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AbsolutePath localDir_;
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/** location of the materialized files/dirs */
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AbsolutePath contentDir_;
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};
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}
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}
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