示例#1
0
文件: fs.go 项目: mbookman/gcsfuse
// LOCKS_EXCLUDED(fs.mu)
func (fs *fileSystem) MkDir(
	op *fuseops.MkDirOp) (err error) {
	// Find the parent.
	fs.mu.Lock()
	parent := fs.inodes[op.Parent].(inode.DirInode)
	fs.mu.Unlock()

	// Create an empty backing object for the child, failing if it already
	// exists.
	parent.Lock()
	o, err := parent.CreateChildDir(op.Context(), op.Name)
	parent.Unlock()

	// Special case: *gcs.PreconditionError means the name already exists.
	if _, ok := err.(*gcs.PreconditionError); ok {
		err = fuse.EEXIST
		return
	}

	// Propagate other errors.
	if err != nil {
		err = fmt.Errorf("CreateChildDir: %v", err)
		return
	}

	// Attempt to create a child inode using the object we created. If we fail to
	// do so, it means someone beat us to the punch with a newer generation
	// (unlikely, so we're probably okay with failing here).
	fs.mu.Lock()
	child := fs.lookUpOrCreateInodeIfNotStale(o.Name, o)
	if child == nil {
		err = fmt.Errorf("Newly-created record is already stale")
		return
	}

	defer fs.unlockAndMaybeDisposeOfInode(child, &err)

	// Fill out the response.
	op.Entry.Child = child.ID()
	op.Entry.Attributes, err = child.Attributes(op.Context())

	if err != nil {
		err = fmt.Errorf("Attributes: %v", err)
		return
	}

	return
}
示例#2
0
func (fs *fsImpl) MkDir(
	ctx context.Context,
	op *fuseops.MkDirOp) (err error) {
	fs.mu.Lock()
	defer fs.mu.Unlock()

	// Make sure the parent exists and has not been forgotten.
	_ = fs.findInodeByID(op.Parent)

	// Mint a child inode.
	childID := fs.nextInodeID
	fs.nextInodeID++

	child := &inode{
		attributes: fuseops.InodeAttributes{
			Nlink: 0,
			Mode:  0777 | os.ModeDir,
		},
	}

	fs.inodes[childID] = child
	child.IncrementLookupCount()

	// Return an appropriate entry.
	op.Entry = fuseops.ChildInodeEntry{
		Child:      childID,
		Attributes: child.attributes,
	}

	return
}
示例#3
0
func (fs *memFS) MkDir(
	op *fuseops.MkDirOp) (err error) {
	fs.mu.Lock()
	defer fs.mu.Unlock()

	// Grab the parent, which we will update shortly.
	parent := fs.getInodeOrDie(op.Parent)

	// Ensure that the name doesn't already exist, so we don't wind up with a
	// duplicate.
	_, _, exists := parent.LookUpChild(op.Name)
	if exists {
		err = fuse.EEXIST
		return
	}

	// Set up attributes from the child, using the credentials of the calling
	// process as owner (matching inode_init_owner, cf. http://goo.gl/5qavg8).
	childAttrs := fuseops.InodeAttributes{
		Nlink: 1,
		Mode:  op.Mode,
		Uid:   op.Header().Uid,
		Gid:   op.Header().Gid,
	}

	// Allocate a child.
	childID, child := fs.allocateInode(childAttrs)

	// Add an entry in the parent.
	parent.AddChild(childID, op.Name, fuseutil.DT_Directory)

	// Fill in the response.
	op.Entry.Child = childID
	op.Entry.Attributes = child.attrs

	// We don't spontaneously mutate, so the kernel can cache as long as it wants
	// (since it also handles invalidation).
	op.Entry.AttributesExpiration = fs.clock.Now().Add(365 * 24 * time.Hour)
	op.Entry.EntryExpiration = op.Entry.EntryExpiration

	return
}