From 36bbf9e9668d1982afffbe069ab3b26a3822a1e7 Mon Sep 17 00:00:00 2001
From: boyuan-he <67342292+boyuan-he@users.noreply.github.com>
Date: Wed, 9 Sep 2020 17:13:18 -0700
Subject: Implement FUSE_UNLINK

Fixes #3696
---
 pkg/sentry/fsimpl/fuse/fusefs.go | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'pkg/sentry/fsimpl/fuse')

diff --git a/pkg/sentry/fsimpl/fuse/fusefs.go b/pkg/sentry/fsimpl/fuse/fusefs.go
index f4ed73c12..8e749bdad 100644
--- a/pkg/sentry/fsimpl/fuse/fusefs.go
+++ b/pkg/sentry/fsimpl/fuse/fusefs.go
@@ -455,6 +455,29 @@ func (i *inode) NewSymlink(ctx context.Context, name, target string) (*vfs.Dentr
 	return i.newEntry(ctx, name, linux.S_IFLNK, linux.FUSE_SYMLINK, &in)
 }
 
+// Unlink implements kernfs.Inode.Unlink.
+func (i *inode) Unlink(ctx context.Context, name string, child *vfs.Dentry) error {
+	kernelTask := kernel.TaskFromContext(ctx)
+	if kernelTask == nil {
+		log.Warningf("fusefs.Inode.newEntry: couldn't get kernel task from context", i.NodeID)
+		return syserror.EINVAL
+	}
+	in := linux.FUSEUnlinkIn{Name: name}
+	req, err := i.fs.conn.NewRequest(auth.CredentialsFromContext(ctx), uint32(kernelTask.ThreadID()), i.NodeID, linux.FUSE_UNLINK, &in)
+	if err != nil {
+		return err
+	}
+	res, err := i.fs.conn.Call(kernelTask, req)
+	if err != nil {
+		return err
+	}
+	// only return error, discard res.
+	if err := res.Error(); err != nil {
+		return err
+	}
+	return i.dentry.RemoveChildLocked(name, child)
+}
+
 // NewDir implements kernfs.Inode.NewDir.
 func (i *inode) NewDir(ctx context.Context, name string, opts vfs.MkdirOptions) (*vfs.Dentry, error) {
 	in := linux.FUSEMkdirIn{
-- 
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