X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/eee302a3157296bccf40e9b83f52c2952294a04e..d8d6bca4b5db4851a29473f08dc600816c977a21:/sdk/go/arvados/fs_base.go

diff --git a/sdk/go/arvados/fs_base.go b/sdk/go/arvados/fs_base.go
index 5e57fed3be..2478641df5 100644
--- a/sdk/go/arvados/fs_base.go
+++ b/sdk/go/arvados/fs_base.go
@@ -106,6 +106,9 @@ type FileSystem interface {
 	// path is "", flush all dirs/streams; otherwise, flush only
 	// the specified dir/stream.
 	Flush(path string, shortBlocks bool) error
+
+	// Estimate current memory usage.
+	MemorySize() int64
 }
 
 type inode interface {
@@ -156,6 +159,7 @@ type inode interface {
 	sync.Locker
 	RLock()
 	RUnlock()
+	MemorySize() int64
 }
 
 type fileinfo struct {
@@ -229,6 +233,13 @@ func (*nullnode) Child(name string, replace func(inode) (inode, error)) (inode,
 	return nil, ErrNotADirectory
 }
 
+func (*nullnode) MemorySize() int64 {
+	// Types that embed nullnode should report their own size, but
+	// if they don't, we at least report a non-zero size to ensure
+	// a large tree doesn't get reported as 0 bytes.
+	return 64
+}
+
 type treenode struct {
 	fs       FileSystem
 	parent   inode
@@ -319,6 +330,15 @@ func (n *treenode) Sync() error {
 	return nil
 }
 
+func (n *treenode) MemorySize() (size int64) {
+	n.RLock()
+	defer n.RUnlock()
+	for _, inode := range n.inodes {
+		size += inode.MemorySize()
+	}
+	return
+}
+
 type fileSystem struct {
 	root inode
 	fsBackend
@@ -598,9 +618,8 @@ func (fs *fileSystem) remove(name string, recursive bool) error {
 func (fs *fileSystem) Sync() error {
 	if syncer, ok := fs.root.(syncer); ok {
 		return syncer.Sync()
-	} else {
-		return ErrInvalidOperation
 	}
+	return ErrInvalidOperation
 }
 
 func (fs *fileSystem) Flush(string, bool) error {
@@ -608,6 +627,10 @@ func (fs *fileSystem) Flush(string, bool) error {
 	return ErrInvalidOperation
 }
 
+func (fs *fileSystem) MemorySize() int64 {
+	return fs.root.MemorySize()
+}
+
 // rlookup (recursive lookup) returns the inode for the file/directory
 // with the given name (which may contain "/" separators). If no such
 // file/directory exists, the returned node is nil.