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446ae54b71
Summary: On Windows, the FS refcount is used to indicate that ProjectedFS knows about this inode and either has a placeholder on disk, or a plain file. The first event only occurs on lookup (similarly to Linux/macOS), while the second one happens when files are created by the user and we receive a notification about it. In order to avoid races and to miss necessary invalidation, the refcount has to be incremented after the placeholder has been created, and the refcount is decremented before the invalidation is performed. This is straightforward to achieve for notifications, but requires passing a callback to the PrfsChannel. Reviewed By: chadaustin Differential Revision: D24800819 fbshipit-source-id: 0e7ea7ed3a9ca0414e3e727fba975045546d82d1
154 lines
3.6 KiB
C++
154 lines
3.6 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its 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 "folly/portability/Windows.h"
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#include <ProjectedFSLib.h> // @manual
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#include "eden/fs/prjfs/Enumerator.h"
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#include "eden/fs/utils/Guid.h"
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#include "eden/fs/utils/PathFuncs.h"
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namespace folly {
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template <class T>
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class Future;
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} // namespace folly
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namespace facebook::eden {
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class ObjectFetchContext;
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class EdenStats;
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struct InodeMetadata {
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// To ensure that the OS has a record of the canonical file name, and not
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// just whatever case was used to lookup the file, we capture the
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// relative path here.
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RelativePath path;
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size_t size;
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bool isDir;
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};
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struct LookupResult {
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InodeMetadata meta;
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std::function<void()> incFsRefcount;
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};
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class Dispatcher {
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public:
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virtual ~Dispatcher();
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explicit Dispatcher(EdenStats* stats);
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EdenStats* getStats() const;
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/**
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* Open a directory
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*/
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virtual folly::Future<std::vector<FileMetadata>> opendir(
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RelativePathPiece path,
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ObjectFetchContext& context) = 0;
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/**
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* Lookup the specified file and get its attributes.
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*/
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virtual folly::Future<std::optional<LookupResult>> lookup(
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RelativePath path,
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ObjectFetchContext& context) = 0;
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/**
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* Test if a file with the given name exist
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*/
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virtual folly::Future<bool> access(
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RelativePath path,
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ObjectFetchContext& context) = 0;
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/**
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* Read the file with the given name
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*
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* Returns the entire content of the file at path.
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*
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* In the future, this will return only what's in between offset and
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* offset+length.
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*/
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virtual folly::Future<std::string> read(
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RelativePath path,
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uint64_t offset,
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uint32_t length,
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ObjectFetchContext& context) = 0;
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/**
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* Notification sent when a file was created
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*/
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virtual folly::Future<folly::Unit> newFileCreated(
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RelativePath relPath,
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RelativePath destPath,
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bool isDirectory,
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ObjectFetchContext& context) = 0;
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/**
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* Notification sent when a file was ovewritten
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*/
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virtual folly::Future<folly::Unit> fileOverwritten(
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RelativePath relPath,
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RelativePath destPath,
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bool isDirectory,
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ObjectFetchContext& context) = 0;
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/**
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* Notification sent when a file is closed after being modified
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*/
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virtual folly::Future<folly::Unit> fileHandleClosedFileModified(
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RelativePath relPath,
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RelativePath destPath,
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bool isDirectory,
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ObjectFetchContext& context) = 0;
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/**
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* Notification sent when a file is renamed
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*/
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virtual folly::Future<folly::Unit> fileRenamed(
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RelativePath oldPath,
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RelativePath newPath,
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bool isDirectory,
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ObjectFetchContext& context) = 0;
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/**
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* Notification sent prior to renaming a file
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*
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* A failure will block the rename operation
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*/
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virtual folly::Future<folly::Unit> preRename(
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RelativePath oldPath,
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RelativePath newPath,
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bool isDirectory,
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ObjectFetchContext& context) = 0;
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/**
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* Notification sent when a file is being removed
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*/
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virtual folly::Future<folly::Unit> fileHandleClosedFileDeleted(
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RelativePath relPath,
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RelativePath destPath,
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bool isDirectory,
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ObjectFetchContext& context) = 0;
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/**
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* Notification sent prior to creating a hardlink
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*
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* A failure will block the hardlink operation
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*/
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virtual folly::Future<folly::Unit> preSetHardlink(
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RelativePath oldPath,
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RelativePath newPath,
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bool isDirectory,
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ObjectFetchContext& context) = 0;
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private:
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EdenStats* stats_{nullptr};
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};
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} // namespace facebook::eden
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