lib/nfs/Connection: add Lstat

src/lib/nfs/Connection.cxx

@@ -53,6 +53,18 @@ NfsConnection::CancellableCallback::Stat(nfs_context *ctx,
 					 nfs_get_error(ctx));
 }
 
+inline void
+NfsConnection::CancellableCallback::Lstat(nfs_context *ctx,
+					  const char *path)
+{
+	assert(connection.GetEventLoop().IsInside());
+
+	int result = nfs_lstat64_async(ctx, path, Callback, this);
+	if (result < 0)
+		throw FormatRuntimeError("nfs_lstat64_async() failed: %s",
+					 nfs_get_error(ctx));
+}
+
 inline void
 NfsConnection::CancellableCallback::OpenDirectory(nfs_context *ctx,
 						  const char *path)
@@ -231,6 +243,23 @@ NfsConnection::Stat(const char *path, NfsCallback &callback)
 	ScheduleSocket();
 }
 
+void
+NfsConnection::Lstat(const char *path, NfsCallback &callback)
+{
+	assert(GetEventLoop().IsInside());
+	assert(!callbacks.Contains(callback));
+
+	auto &c = callbacks.Add(callback, *this, false);
+	try {
+		c.Lstat(context, path);
+	} catch (...) {
+		callbacks.Remove(c);
+		throw;
+	}
+
+	ScheduleSocket();
+}
+
 void
 NfsConnection::OpenDirectory(const char *path, NfsCallback &callback)
 {

src/lib/nfs/Connection.hxx

@@ -66,6 +66,7 @@ class NfsConnection : SocketMonitor {
 			 open(_open), close_fh(nullptr) {}
 
 		void Stat(nfs_context *context, const char *path);
+		void Lstat(nfs_context *context, const char *path);
 		void OpenDirectory(nfs_context *context, const char *path);
 		void Open(nfs_context *context, const char *path, int flags);
 		void Stat(nfs_context *context, struct nfsfh *fh);
@@ -175,6 +176,7 @@ public:
 	void RemoveLease(NfsLease &lease) noexcept;
 
 	void Stat(const char *path, NfsCallback &callback);
+	void Lstat(const char *path, NfsCallback &callback);
 
 	void OpenDirectory(const char *path, NfsCallback &callback);
 	const struct nfsdirent *ReadDirectory(struct nfsdir *dir) noexcept;