Hi Vyacheslav, Just to make sure I understand your approach: You reserve two areas (a few mb in size) which are dedicated to hold only super-root data and this data is written at the same frequency as the current superblock? If so, this most likely won't improve the situation for flash media with weak FTL - as those writes will still be concentrated around a few erase blocks. For devices with powerful FTL such as modern SSDs, updating the superblock periodically doesn't pose a real problem. I am still somewhat favour an optional simple linear-scan. Would it be possible to check at mount-time whether the volume was cleanly unmounted and otherwise perform a linear scan? So when I mount the volume with o=no_superblock_update a flag is set in the superblock, which is reset on a clean volume unmount after the most recent segment has been stored in the superblock. When at mount-time the flag is still set, nilfs knows a scan is required as the segment in the superblock is not up-to-date. Thanks & regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
