Separate O_DSYNC and O_SYNC.

PiperOrigin-RevId: 258657913

1 files changed, 8 insertions, 1 deletions

diff --git a/pkg/sentry/fs/flags.go b/pkg/sentry/fs/flags.go
index 1278f9c78..0fab876a9 100644
--- a/pkg/sentry/fs/flags.go
+++ b/pkg/sentry/fs/flags.go
@@ -28,7 +28,11 @@ type FileFlags struct {
 	// NonBlocking indicates that I/O should not block.
 	NonBlocking bool
 
-	// Sync indicates that any writes should be synchronous.
+	// DSync indicates that each write will flush data and metadata required to
+	// read the file's contents.
+	DSync bool
+
+	// Sync indicates that each write will flush data and all file metadata.
 	Sync bool
 
 	// Append indicates this file is append only.
@@ -96,6 +100,9 @@ func (f FileFlags) ToLinux() (mask uint) {
 	if f.NonBlocking {
 		mask |= linux.O_NONBLOCK
 	}
+	if f.DSync {
+		mask |= linux.O_DSYNC
+	}
 	if f.Sync {
 		mask |= linux.O_SYNC
 	}