On Sun, 29 April 2007 18:34:59 +0200, Andi Kleen wrote: > Matt Mackall <mpm@xxxxxxxxxxx> writes: > > > This is a relatively simple scheme for making a filesystem with > > incremental online consistency checks of both data and metadata. > > Overhead can be well under 1% disk space and CPU overhead may also be > > very small, while greatly improving filesystem integrity. > > Problem I see is that your scheme doesn't support metadata checksums only. Why? It is fairly simple to run many different schemes with this: - Generate checksums for everything, compare for each access. - Generate checksums for everything, only compare metadata checksums. - Generate checksums for everything, only compare at fsck time. - Generate metadata checksums, use 0x0000_0000 as data "checksums". - Not generate any checksums. Users without checksums would still pay the .1% space overhead, sure. I'd bet they already pay more for unused inodes. Jörn -- ticks = jiffies; while (ticks == jiffies); ticks = jiffies; -- /usr/src/linux/init/main.c - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
