Re: One more bio for for floppy users in 2.5.33..

[Andrew Morton]

Rogier Wolff wrote:
> 
> ...
> 
> Ehmm. I'm in the data-recovery business, and we seem to have lost
> the ability to recover the other 3k of a 4k page if one of the blocks
> is bad.
>
> And we're annoyed about the read-ahead trying to read blocks past
> a bad block without returning to the application.
> 

You can use the raw driver, or O_DIRECT against /dev/hdXX.  That
will give 512-byte granularity and no readahead.