Re: Future Linux filesystems

[Joe Peterson <lavajoe@gentoo.org>]

Martin K. Petersen wrote:
> We're very concerned about data integrity.  With btrfs everything is
> checksummed at the logical level.  This allows you to detect data
> corruption, repair bad blocks using redundant, good copies, perform
> data scrubbing, etc.

That's the main reason I am interesting in btrfs, actually.  :)

> A related, but orthogonal data integrity measure is the T10 DIF
> infrastructure that I am working on.  DIF enables protection at the
> sector level and includes stuff like a data checksum and a locality
> check which ensures that the sector ends up the right place on disk.

Great!  Really great to hear that this issue is being actively worked.

> Right now the DIF checksum is added at the block layer level.  Work is
> in progress to move it up into the filesystems and from there into
> user space.  Eventually we'd like to be able to generate the checksum
> in the application and pass it along the I/O path all the way out to
> the physical disk.

Yep, end-to-end is a great idea.  Kudos to this and to btrfs!

					-Joe