<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD><TITLE></TITLE> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2900.3492" name=GENERATOR></HEAD> <BODY> Andreas Dilger wrote: > On Dec 25, 2008 12:35 -0200, Alberto Bertogli wrote: > > On Wed, Dec 24, 2008 at 06:49:15PM -0500, Theodore Tso wrote: > > > I have no idea why you would need to do manual __breads(). No doubt > > > I'm missing some context here. > > > > I'm writing (just for fun and learning purposes) a device mapper > > module that stores checksums on writes and verifies them on reads. The > > integrity metadata (currently just the checksum) is interleaved in the > > backing device: one sector holding the integrity metadata for the > > following 64 data sectors. > Alex and I discussed implementing checksums for ext4 using an external device like this, and he might have some more design information for you. That external device could possibly be a TPM chip that can store checksums. <DIV align=left>Shyam Iyer</DIV> <DIV align=left>Dell Linux Engineering</DIV></BODY></HTML>