From 652f7b1d0fef6f522baaed091d4820a48014092c Mon Sep 17 00:00:00 2001
From: Kevin Krakauer <krakauer@google.com>
Date: Sat, 19 Oct 2019 11:48:09 -0700
Subject: Add support for pipes in VFS2.

PiperOrigin-RevId: 275650307
---
 pkg/sentry/vfs/syscalls.go | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to 'pkg/sentry/vfs/syscalls.go')

diff --git a/pkg/sentry/vfs/syscalls.go b/pkg/sentry/vfs/syscalls.go
index 23f2b9e08..abde0feaa 100644
--- a/pkg/sentry/vfs/syscalls.go
+++ b/pkg/sentry/vfs/syscalls.go
@@ -96,6 +96,26 @@ func (vfs *VirtualFilesystem) MkdirAt(ctx context.Context, creds *auth.Credentia
 	}
 }
 
+// MknodAt creates a file of the given mode at the given path. It returns an
+// error from the syserror package.
+func (vfs *VirtualFilesystem) MknodAt(ctx context.Context, creds *auth.Credentials, pop *PathOperation, opts *MknodOptions) error {
+	rp, err := vfs.getResolvingPath(creds, pop)
+	if err != nil {
+		return nil
+	}
+	for {
+		if err = rp.mount.fs.impl.MknodAt(ctx, rp, *opts); err == nil {
+			vfs.putResolvingPath(rp)
+			return nil
+		}
+		// Handle mount traversals.
+		if !rp.handleError(err) {
+			vfs.putResolvingPath(rp)
+			return err
+		}
+	}
+}
+
 // OpenAt returns a FileDescription providing access to the file at the given
 // path. A reference is taken on the returned FileDescription.
 func (vfs *VirtualFilesystem) OpenAt(ctx context.Context, creds *auth.Credentials, pop *PathOperation, opts *OpenOptions) (*FileDescription, error) {
@@ -198,8 +218,6 @@ func (fd *FileDescription) SetStatusFlags(ctx context.Context, flags uint32) err
 //
 // - VFS.LinkAt()
 //
-// - VFS.MknodAt()
-//
 // - VFS.ReadlinkAt()
 //
 // - VFS.RenameAt()
-- 
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