From c22e78ee41f4c5a91429bb83c6be3e60b4c2a20f Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 5 Jul 2020 19:33:50 +0200
Subject: v2api: implement Opendir

---
 internal/fusefrontend/node_api_check.go |  1 +
 internal/fusefrontend/node_dir_ops.go   | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

(limited to 'internal/fusefrontend')

diff --git a/internal/fusefrontend/node_api_check.go b/internal/fusefrontend/node_api_check.go
index 9b5746a..d9facb7 100644
--- a/internal/fusefrontend/node_api_check.go
+++ b/internal/fusefrontend/node_api_check.go
@@ -14,3 +14,4 @@ var _ = (fs.NodeRmdirer)((*Node)(nil))
 var _ = (fs.NodeUnlinker)((*Node)(nil))
 var _ = (fs.NodeReadlinker)((*Node)(nil))
 var _ = (fs.NodeOpener)((*Node)(nil))
+var _ = (fs.NodeOpendirer)((*Node)(nil))
diff --git a/internal/fusefrontend/node_dir_ops.go b/internal/fusefrontend/node_dir_ops.go
index 8aa79ba..32e5e86 100644
--- a/internal/fusefrontend/node_dir_ops.go
+++ b/internal/fusefrontend/node_dir_ops.go
@@ -348,3 +348,20 @@ retry:
 	}
 	return 0
 }
+
+// Opendir is a FUSE call to check if the directory can be opened.
+func (n *Node) Opendir(ctx context.Context) (errno syscall.Errno) {
+	dirfd, cName, errno := n.prepareAtSyscall("")
+	if errno != 0 {
+		return
+	}
+	defer syscall.Close(dirfd)
+
+	// Open backing directory
+	fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_DIRECTORY, 0)
+	if err != nil {
+		return fs.ToErrno(err)
+	}
+	syscall.Close(fd)
+	return 0
+}
-- 
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