bf284aee23
Only if we create a file we know for sure that it is empty and hence our sparse file logic of skipping over NUL bytes can can work. If we hwoever are called to write data to some existing file/block device, we must do regular writes to override everything that might be in place before. Hence, conditionalize sparse file writing on the write offset not being configured (which is how we internally distinguish write to existing file and write to new file)
System and Service Manager
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