コード例 #1
0
ファイル: FileRepository.cs プロジェクト: seclerp/FileFS
        private Cursor WriteFileDescriptor(IFileEntry file, bool isNewFile)
        {
            _logger.Information($"Start writing file descriptor for filename {file.EntryName}");

            var allocatedCursor = _allocator.AllocateFile(file.DataLength, isNewFile);

            var filesystemDescriptor = _filesystemDescriptorAccessor.Value;
            var createdOn            = DateTime.UtcNow.ToUnixTime();
            var updatedOn            = createdOn;
            var id                   = Guid.NewGuid();
            var fileDescriptor       = new EntryDescriptor(id, file.ParentEntryId, file.EntryName, EntryType.File, createdOn, updatedOn, allocatedCursor.Offset, file.DataLength);
            var fileDescriptorOffset = -FilesystemDescriptor.BytesTotal -
                                       (filesystemDescriptor.EntryDescriptorsCount *
                                        filesystemDescriptor.EntryDescriptorLength)
                                       - filesystemDescriptor.EntryDescriptorLength;

            var origin = SeekOrigin.End;
            var cursor = new Cursor(fileDescriptorOffset, origin);

            var storageItem = new StorageItem <EntryDescriptor>(in fileDescriptor, in cursor);

            _entryDescriptorRepository.Write(storageItem);

            _logger.Information($"Done writing file descriptor for filename {file.EntryName}");

            return(allocatedCursor);
        }
コード例 #2
0
        /// <inheritdoc/>
        public void Create(DirectoryEntry directoryEntry)
        {
            _logger.Information($"Start writing entry descriptor for directory {directoryEntry.EntryName}");

            var filesystemDescriptor = _filesystemDescriptorAccessor.Value;
            var createdOn            = DateTime.UtcNow.ToUnixTime();
            var updatedOn            = createdOn;
            var entryDescriptor      = new EntryDescriptor(
                directoryEntry.Id,
                directoryEntry.ParentEntryId,
                directoryEntry.EntryName,
                EntryType.Directory,
                createdOn,
                updatedOn,
                0,
                0);

            var entryDescriptorOffset = -FilesystemDescriptor.BytesTotal -
                                        (filesystemDescriptor.EntryDescriptorsCount *
                                         filesystemDescriptor.EntryDescriptorLength)
                                        - filesystemDescriptor.EntryDescriptorLength;

            var origin = SeekOrigin.End;
            var cursor = new Cursor(entryDescriptorOffset, origin);

            var storageItem = new StorageItem <EntryDescriptor>(in entryDescriptor, in cursor);

            _entryDescriptorRepository.Write(storageItem);

            _logger.Information($"Done writing entry descriptor for directory {directoryEntry.EntryName}");

            IncreaseEntriesCount(1);
        }
コード例 #3
0
        /// <inheritdoc />
        public void Delete(string entryName)
        {
            // 1. Find last descriptor
            var filesystemDescriptor = _filesystemDescriptorAccessor.Value;
            var lastDescriptorCursor = new Cursor(
                -FilesystemDescriptor.BytesTotal -
                (filesystemDescriptor.EntryDescriptorsCount *
                 filesystemDescriptor.EntryDescriptorLength),
                SeekOrigin.End);
            var lastDescriptor = _entryDescriptorRepository.Read(lastDescriptorCursor).Value;

            // 2. Find current descriptor
            var descriptorItem = _entryDescriptorRepository.Find(entryName);
            var cursor         = descriptorItem.Cursor;

            // 3. Save last descriptor in new empty space (perform swap with last)
            _entryDescriptorRepository.Write(new StorageItem <EntryDescriptor>(lastDescriptor, cursor));

            // 4. Decrease count of descriptors
            IncreaseEntriesCount(-1);
        }
コード例 #4
0
ファイル: StorageInitializer.cs プロジェクト: seclerp/FileFS
        private void CreateRootDirectory()
        {
            var rootDirectoryId = Guid.NewGuid();
            var createdOn       = DateTime.UtcNow.ToUnixTime();
            var updatedOn       = createdOn;
            var rootDirectory   = new EntryDescriptor(
                rootDirectoryId,
                rootDirectoryId,
                "/",
                EntryType.Directory,
                createdOn,
                updatedOn,
                0,
                0);

            // Write root directory descriptor
            var filesystemDescriptor = _filesystemDescriptorAccessor.Value;
            var cursor = new Cursor(-FilesystemDescriptor.BytesTotal - filesystemDescriptor.EntryDescriptorLength, SeekOrigin.End);

            _entryDescriptorRepository.Write(new StorageItem <EntryDescriptor>(rootDirectory, cursor));
        }
コード例 #5
0
ファイル: StorageOptimizer.cs プロジェクト: seclerp/FileFS
        private StorageItem <EntryDescriptor> CopyFile(EntryDescriptor entryDescriptor, Cursor cursor, int destinationOffset)
        {
            var newDescriptor = new EntryDescriptor(
                entryDescriptor.Id,
                entryDescriptor.ParentId,
                entryDescriptor.Name,
                entryDescriptor.Type,
                entryDescriptor.CreatedOn,
                entryDescriptor.UpdatedOn,
                destinationOffset,
                entryDescriptor.DataLength);
            var newStorageItem = new StorageItem <EntryDescriptor>(in newDescriptor, in cursor);

            _logger.Information($"Moving {entryDescriptor.DataLength} bytes of data from {entryDescriptor.DataOffset} to {destinationOffset}");

            PerformCopy(entryDescriptor.DataOffset, destinationOffset, entryDescriptor.DataLength);
            _entryDescriptorRepository.Write(newStorageItem);

            _logger.Information($"{entryDescriptor.DataLength} bytes of data moved to offset {destinationOffset}");

            return(newStorageItem);
        }