fuse: add MountOptions.MaxStackDepth

Addresses #548 Change-Id: I61f348278d0f1de2ae49808f30d7b2f0ae11a40e
hanwen · Dec 2, 2024 · 98027c7 · 98027c7
1 parent 7e2f19f
commit 98027c7
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Showing 3 changed files with 7 additions and 2 deletions.
diff --git a/fuse/api.go b/fuse/api.go
@@ -332,6 +332,9 @@ type MountOptions struct {
 
 	// Disable splicing from files to the FUSE device.
 	DisableSplice bool
+
+	// Maximum stacking depth for passthrough files. Defaults to 1.
+	MaxStackDepth int
 }
 
 // RawFileSystem is an interface close to the FUSE wire protocol.

diff --git a/fuse/opcode.go b/fuse/opcode.go
@@ -146,7 +146,7 @@ func doInit(server *protocolServer, req *request) {
 		CongestionThreshold: uint16(server.opts.MaxBackground * 3 / 4),
 		MaxBackground:       uint16(server.opts.MaxBackground),
 		MaxPages:            uint16(maxPages),
-		MaxStackDepth:       1,
+		MaxStackDepth:       server.opts.MaxStackDepth,
 	}
 	out.setFlags(kernelFlags)
 	if server.opts.MaxReadAhead != 0 && uint32(server.opts.MaxReadAhead) < out.MaxReadAhead {

diff --git a/fuse/server.go b/fuse/server.go
@@ -178,7 +178,9 @@ func NewServer(fs RawFileSystem, mountPoint string, opts *MountOptions) (*Server
 	if o.MaxWrite > MAX_KERNEL_WRITE {
 		o.MaxWrite = MAX_KERNEL_WRITE
 	}
-
+	if o.MaxStackDepth == 0 {
+		o.MaxStackDepth = 1
+	}
 	if o.Name == "" {
 		name := fs.String()
 		l := len(name)