Implemented inode.RemoveChild.
parent
621df57d80
commit
400d74dbdd
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@ -38,7 +38,8 @@ type inode struct {
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// INVARIANT: If !dir, then os.ModeDir is not set
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attributes fuse.InodeAttributes // GUARDED_BY(mu)
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// For directories, entries describing the children of the directory.
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// For directories, entries describing the children of the directory. Unused
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// entries are of type DT_Unknown.
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//
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// This array can never be shortened, nor can its elements be moved, because
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// we use its indices for Dirent.Offset, which is exposed to the user who
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@ -50,7 +51,7 @@ type inode struct {
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//
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// INVARIANT: If dir is false, this is nil.
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// INVARIANT: For each i, entries[i].Offset == i+1
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// INVARIANT: Contains no duplicate names.
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// INVARIANT: Contains no duplicate names in used entries.
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entries []fuseutil.Dirent // GUARDED_BY(mu)
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// For files, the current contents of the file.
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@ -100,11 +101,13 @@ func (inode *inode) checkInvariants() {
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panic(fmt.Sprintf("Unexpected offset: %v", e.Offset))
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}
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if _, ok := childNames[e.Name]; ok {
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panic(fmt.Sprintf("Duplicate name: %s", e.Name))
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}
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if e.Type != fuseutil.DT_Unknown {
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if _, ok := childNames[e.Name]; ok {
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panic(fmt.Sprintf("Duplicate name: %s", e.Name))
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}
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childNames[e.Name] = struct{}{}
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childNames[e.Name] = struct{}{}
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}
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}
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}
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@ -156,6 +159,7 @@ func (inode *inode) LookUpChild(name string) (id fuse.InodeID, ok bool) {
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// Add an entry for a child.
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//
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// REQUIRES: inode.dir
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// REQUIRES: dt != fuseutil.DT_Unknown
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// EXCLUSIVE_LOCKS_REQUIRED(inode.mu)
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func (inode *inode) AddChild(
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id fuse.InodeID,
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@ -169,6 +173,8 @@ func (inode *inode) AddChild(
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}
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inode.entries = append(inode.entries, e)
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// TODO(jacobsa): Re-use gaps.
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}
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// Remove an entry for a child.
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@ -176,7 +182,18 @@ func (inode *inode) AddChild(
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// REQUIRES: inode.dir
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// REQUIRES: An entry for the given name exists.
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// EXCLUSIVE_LOCKS_REQUIRED(inode.mu)
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func (inode *inode) RemoveChild(name string)
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func (inode *inode) RemoveChild(name string) {
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// Find the entry.
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i, ok := inode.findChild(name)
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if !ok {
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panic(fmt.Sprintf("Unknown child: %s", name))
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}
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// Mark it as unused.
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inode.entries[i] = fuseutil.Dirent{
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Type: fuseutil.DT_Unknown,
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}
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}
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// Serve a ReadDir request.
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//
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@ -188,6 +205,13 @@ func (inode *inode) ReadDir(offset int, size int) (data []byte, err error) {
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}
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for i := offset; i < len(inode.entries); i++ {
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e := inode.entries[i]
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// Skip unused entries.
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if e.Type == fuseutil.DT_Unknown {
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continue
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}
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data = fuseutil.AppendDirent(data, inode.entries[i])
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// Trim and stop early if we've exceeded the requested size.
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