On Sun, 2013-07-07 at 14:46 +0200, Bernd Schubert wrote:

The block layer has no knowledge which file a block belongs to.

Sure...

 Even for
file systems that is hard task to figure out, as only inodes store
information which blocks they use. So if you would want to figure out
the corresponding file, you first need to scan through all inodes and
search for the specific block. Once you have the corresponding inode you
need to find directory-entries referencing it. So lots of expensive
reverse searching.

Well of course nothing that should run online in the RAID drivers... but
when you have a tool like raid6check or similar... it sounds nice if it
would tell you which files were affected (if any).


Cheers,
Chris.