On Fri, Apr 29, 2016 at 12:38:20PM -0400, Waiman Long wrote: > From my testing, it looked like that parallel overwrites to the same file in > an ext4 filesystem on DAX can happen in parallel even if their range > overlaps. It was mainly because the code will drop the i_mutex before the > write. That means the overlapped blocks can get garbage. I think this is a > problem, but I am not expert in the ext4 filesystem to say for sure. I would > like to know your thought on that. That's another issue with dax I/O pretending to be direct I/O.. Because it isn't we'll need to synchronize it like buffered I/O and not like direct I/O in all file systems. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
