Add PARALLEL_DIROPS FUSE option to jacobsa/fuse

Author: sethiay

connection.go

@@ -193,6 +193,11 @@ func (c *Connection) Init() error {
 		initOp.Flags |= fusekernel.InitNoOpendirSupport
 	}
 
+	// Tell the Kernel to allow sending parallel lookup and readdir operations.
+	if c.cfg.EnableParallelDirOps {
+		initOp.Flags |= fusekernel.InitParallelDirOps
+	}
+
 	return c.Reply(ctx, nil)
 }
 

internal/fusekernel/fuse_kernel.go

@@ -266,6 +266,7 @@ const (
 	InitAsyncDIO         InitFlags = 1 << 15
 	InitWritebackCache   InitFlags = 1 << 16
 	InitNoOpenSupport    InitFlags = 1 << 17
+	InitParallelDirOps   InitFlags = 1 << 18
 	InitMaxPages         InitFlags = 1 << 22
 	InitCacheSymlinks    InitFlags = 1 << 23
 	InitNoOpendirSupport InitFlags = 1 << 24

mount_config.go

@@ -185,6 +185,11 @@ type MountConfig struct {
 	// Flag to enable async reads that are received from
 	// the kernel
 	EnableAsyncReads bool
+
+	// Flag to enable parallel lookup and readdir operations from the
+	// kernel
+	// Ref: https://github.com/torvalds/linux/commit/5c672ab3f0ee0f78f7acad183f34db0f8781a200
+	EnableParallelDirOps bool
 }
 
 // Create a map containing all of the key=value mount options to be given to