From 6a90c88b97481a6d81b05f09d5c8ed7158225dd5 Mon Sep 17 00:00:00 2001
From: Zach Koopmans <zkoopmans@google.com>
Date: Wed, 1 Jul 2020 13:13:04 -0700
Subject: Port fallocate to VFS2.

PiperOrigin-RevId: 319283715
---
 pkg/sentry/fsimpl/host/host.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

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

diff --git a/pkg/sentry/fsimpl/host/host.go b/pkg/sentry/fsimpl/host/host.go
index d5e73ddae..007b3332e 100644
--- a/pkg/sentry/fsimpl/host/host.go
+++ b/pkg/sentry/fsimpl/host/host.go
@@ -543,6 +543,16 @@ func (f *fileDescription) Release() {
 	// noop
 }
 
+// Allocate implements vfs.FileDescriptionImpl.
+func (f *fileDescription) Allocate(ctx context.Context, mode, offset, length uint64) error {
+	if !f.inode.seekable {
+		return syserror.ESPIPE
+	}
+
+	// TODO(gvisor.dev/issue/2923): Implement Allocate for non-pipe hostfds.
+	return syserror.EOPNOTSUPP
+}
+
 // PRead implements FileDescriptionImpl.
 func (f *fileDescription) PRead(ctx context.Context, dst usermem.IOSequence, offset int64, opts vfs.ReadOptions) (int64, error) {
 	i := f.inode
-- 
cgit v1.2.3