* Added a handy BDiskSystem::SupportsWriting().

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28066 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/storage/DiskSystem.h

@@ -45,6 +45,7 @@ public:
 			bool			SupportsCreatingChild() const;
 			bool			SupportsDeletingChild() const;
 			bool			SupportsInitializing() const;
+			bool			SupportsWriting() const;
 
 			status_t		GetTypeForContentType(const char* contentType,
 								BString* type) const;

src/kits/storage/disk_device/DiskSystem.cpp

@@ -290,6 +290,17 @@ BDiskSystem::SupportsInitializing() const
 }
 
 
+bool
+BDiskSystem::SupportsWriting() const
+{
+	if (InitCheck() != B_OK
+		|| !IsFileSystem())
+		return false;
+
+	return (fFlags & B_DISK_SYSTEM_SUPPORTS_WRITING) != 0;
+}
+
+
 // GetTypeForContentType
 status_t
 BDiskSystem::GetTypeForContentType(const char* contentType, BString* type) const