diff options
Diffstat (limited to 'pkg/sentry/fs/ext/regular_file.go')
-rw-r--r-- | pkg/sentry/fs/ext/regular_file.go | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/pkg/sentry/fs/ext/regular_file.go b/pkg/sentry/fs/ext/regular_file.go deleted file mode 100644 index b48f61795..000000000 --- a/pkg/sentry/fs/ext/regular_file.go +++ /dev/null @@ -1,85 +0,0 @@ -// Copyright 2019 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package ext - -import ( - "io" -) - -// fileReader is used to abstact away the complexity of how the file data is -// stored under the hood. Provides a method to get a file reader which can be -// used to read file data without worrying about how it is organized on disk. -type fileReader interface { - - // getFileReader returns a Reader implementation which can be used to read a - // file. It abstracts away the complexity of how the file is actually - // organized on disk. The reader is initialized with the passed offset. - // - // This reader is not meant to be retained across Read operations as it needs - // to be reinitialized with the correct offset for every Read. - getFileReader(dev io.ReaderAt, blkSize uint64, offset uint64) io.Reader -} - -// regularFile represents a regular file's inode. This too follows the -// inheritance pattern prevelant in the vfs layer described in -// pkg/sentry/vfs/README.md. -type regularFile struct { - inode inode - - // This is immutable. The first field of fileReader implementations must be - // regularFile to ensure temporality. - impl fileReader -} - -// newRegularFile is the regularFile constructor. It figures out what kind of -// file this is and initializes the fileReader. -func newRegularFile(dev io.ReaderAt, blkSize uint64, inode inode) (*regularFile, error) { - regFile := regularFile{ - inode: inode, - } - - inodeFlags := inode.diskInode.Flags() - - if inodeFlags.Extents { - file, err := newExtentFile(dev, blkSize, regFile) - if err != nil { - return nil, err - } - - file.regFile.inode.impl = &file.regFile - return &file.regFile, nil - } - - if inodeFlags.Inline { - if inode.diskInode.Size() > 60 { - panic("ext fs: inline file larger than 60 bytes") - } - - file := newInlineFile(regFile) - file.regFile.inode.impl = &file.regFile - return &file.regFile, nil - } - - file, err := newBlockMapFile(blkSize, regFile) - if err != nil { - return nil, err - } - file.regFile.inode.impl = &file.regFile - return &file.regFile, nil -} - -func (f *regularFile) blksUsed(blkSize uint64) uint64 { - return (f.inode.diskInode.Size() + blkSize - 1) / blkSize -} |