From 481dbfa5ab24ec2c0752b9e748d3617285603c4e Mon Sep 17 00:00:00 2001
From: Jamie Liu <jamieliu@google.com>
Date: Wed, 11 Dec 2019 13:40:57 -0800
Subject: Add vfs.Pathname{WithDeleted,ForGetcwd}.

The former is needed for vfs.FileDescription to implement
memmap.MappingIdentity, and the latter is needed to implement getcwd(2).

PiperOrigin-RevId: 285051855
---
 pkg/sentry/fsimpl/ext/BUILD         | 1 +
 pkg/sentry/fsimpl/ext/filesystem.go | 8 ++++++++
 2 files changed, 9 insertions(+)

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

diff --git a/pkg/sentry/fsimpl/ext/BUILD b/pkg/sentry/fsimpl/ext/BUILD
index 7ccff8b0d..880b7bcd3 100644
--- a/pkg/sentry/fsimpl/ext/BUILD
+++ b/pkg/sentry/fsimpl/ext/BUILD
@@ -38,6 +38,7 @@ go_library(
         "//pkg/abi/linux",
         "//pkg/binary",
         "//pkg/fd",
+        "//pkg/fspath",
         "//pkg/log",
         "//pkg/sentry/arch",
         "//pkg/sentry/context",
diff --git a/pkg/sentry/fsimpl/ext/filesystem.go b/pkg/sentry/fsimpl/ext/filesystem.go
index 2d15e8aaf..e7aa3b41b 100644
--- a/pkg/sentry/fsimpl/ext/filesystem.go
+++ b/pkg/sentry/fsimpl/ext/filesystem.go
@@ -20,6 +20,7 @@ import (
 	"sync"
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
+	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/sentry/context"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/ext/disklayout"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
@@ -441,3 +442,10 @@ func (fs *filesystem) UnlinkAt(ctx context.Context, rp *vfs.ResolvingPath) error
 
 	return syserror.EROFS
 }
+
+// PrependPath implements vfs.FilesystemImpl.PrependPath.
+func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDentry, b *fspath.Builder) error {
+	fs.mu.RLock()
+	defer fs.mu.RUnlock()
+	return vfs.GenericPrependPath(vfsroot, vd, b)
+}
-- 
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