Dear ext4 developers, I'm working on a research project about side channel attacks to hard drives. My testbed runs Ubuntu Linux 12.04 with ext4 file system. When writing a random file with dd command to my hard drive, I could see the process jbd2/sda1 writing two times while it seems to wait a fixed period of time between these two writes. I actually think that the process is first writing the data to the sectors and then updating the ext4 data base in a second step. Is that true or am I wrong? Why is it waiting some seconds between these two steps and on what is that delay depending? Thank you! Sebastian -- 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
