Switched to an array of inodes for memfs, like a real file system.
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23b398bc83
commit
3379842d1e
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@ -25,20 +25,21 @@ type memFS struct {
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mu syncutil.InvariantMutex
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// The next inode to issue.
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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: nextInode > 0
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nextInode fuse.InodeID // GUARDED_BY(mu)
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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 map from inode number to file or directory with that inode.
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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: inodeIndex[fuse.RootInodeID] != nil
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// INVARIANT: For all keys k, k > 0
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// INVARIANT: For all keys k, k < nextInode
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// INVARIANT: For all keys k, inodeIndex[k] is *memFile or *memDir
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// INVARIANT: For all keys k, inodeIndex[k].inode == k
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// INVARIANT: For all dirs d, all of d's children are in the map.
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inodeIndex map[fuse.InodeID]interface{} // GUARDED_BY(mu)
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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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@ -0,0 +1,13 @@
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// 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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// Common attributes for files and directories.
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type inode struct {
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// The *memFile or *memDir for this inode, or nil if the inode is available
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// for reuse.
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//
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// INVARIANT: impl is nil, or of type *memFile or *memDir
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impl interface{}
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}
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