[dm-devel] Status of dm integrity checksumming features

[Pasi Kärkkäinen]

Hello,

What's the current status of Linux device mapper integrity (checksumming) features? 

iirc bio integrity extensions were integrated into Linux 2.6.27, but those are only
usable for SCSI disks that provide 520-bytes per sector support and also have the 
hardware support for verifying the checksums, correct? Or then you need to have a HBA
or RAID-adapter with integrity support..

(bio integrity patches: http://kerneltrap.org/mailarchive/linux-kernel/2008/6/7/2056354)

Is it possible to use 'normal' 512-bytes per sectors disks, and store the checksums
on them, and calculate/verify the checkcums in software in device mapper.. 
this obviously gives you a bit less usable space, but would be suitable for sw-raid scenarios. 

I guess that sounds pretty much like dm-csum:
https://patchwork.kernel.org/patch/25245/

What's the status of all this nowadays? 

Thanks!

-- Pasi