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9f07485239
Summary: The serialized data for each file handle needs to be enough to re-construct the handle when we load it into a new process later on. We need the inode number, the file handle number that we communicated to the kernel and a flag to let us know whether it is a file or a dir. Note that the file handle allocation strategy already accomodates the idea of migrating to a new process; we don't need to serialize anything like a next file handle id number. This doesn't implement instantiating the handles from the loaded state, it is just the plumbing for saving and loading that state information. Reviewed By: bolinfest Differential Revision: D5733079 fbshipit-source-id: 8fb8afb8ae9694d013ce7a4a82c31bc876ed33c9
45 lines
1.3 KiB
C++
45 lines
1.3 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 "eden/fs/fuse/FileHandle.h"
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#include "eden/fs/inodes/InodePtr.h"
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namespace facebook {
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namespace eden {
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class Blob;
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class FileInode;
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class LocalStore;
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class FileHandle : public fusell::FileHandle {
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public:
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explicit FileHandle(FileInodePtr inode);
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~FileHandle() override {}
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fuse_ino_t getInodeNumber() override;
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folly::Future<fusell::Dispatcher::Attr> getattr() override;
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folly::Future<fusell::Dispatcher::Attr> setattr(
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const struct stat& attr,
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int to_set) override;
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bool preserveCache() const override;
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bool isSeekable() const override;
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folly::Future<fusell::BufVec> read(size_t size, off_t off) override;
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folly::Future<size_t> write(fusell::BufVec&& buf, off_t off) override;
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folly::Future<size_t> write(folly::StringPiece data, off_t off) override;
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folly::Future<folly::Unit> flush(uint64_t lock_owner) override;
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folly::Future<folly::Unit> fsync(bool datasync) override;
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private:
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FileInodePtr inode_;
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};
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}
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}
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