50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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// Author: jacobsa@google.com (Aaron Jacobs)
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package memfs
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import (
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"github.com/jacobsa/fuse"
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"github.com/jacobsa/fuse/fuseutil"
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"github.com/jacobsa/gcloud/syncutil"
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"github.com/jacobsa/gcsfuse/timeutil"
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)
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type memFS struct {
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fuseutil.NotImplementedFileSystem
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/////////////////////////
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// Dependencies
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/////////////////////////
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clock timeutil.Clock
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/////////////////////////
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// Mutable state
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/////////////////////////
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mu syncutil.InvariantMutex
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// The collection of all inodes that have ever been created, indexed by inode
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// ID. Some inodes are not in use if they have been unlinked, and no inode
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// with ID less than fuse.RootInodeID is ever used.
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//
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// INVARIANT: len(inodes) > fuse.RootInodeID
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// INVARIANT: For all i < fuse.RootInodeID, inodes[i].impl == nil
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// INVARIANT: inodes[fuse.RootInodeID].impl is of type *memDir
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inodes []inode // GUARDED_BY(mu)
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// A list of inode IDs within inodes available for reuse, not including the
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// reserved IDs less than fuse.RootInodeID.
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//
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// INVARIANT: This is all and only indices i of inodes such that i >
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// fuse.RootInodeID and inodes[i].impl == nil
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freeInodes []fuse.InodeID // GUARDED_BY(mu)
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}
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// Create a file system that stores data and metadata in memory.
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func NewMemFS(
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clock timeutil.Clock) fuse.FileSystem {
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panic("TODO(jacobsa): Implement NewMemFS.")
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}
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