On Thu 03-06-10 19:09:52, Boaz Harrosh wrote: > [Topic] > How to not let pages change while in IO > > [Abstract] > As seen in a long thread on the fsdvel scsi mailing lists. Lots of > people have headaches and sleep less nights because individual pages > can change while in IO and/or DMA. Though each one as slightly different > needs, the mechanics look to be the same. Hmm, I don't think it's really about "how to not let pages change" - that is doable by using wait_on_page_writeback() in ->page_mkwrite and ->write_begin. I think the discussion is more about whether we should do it or whether we should rechecksum and resubmit IO in case of checksum failure as Nick proposed... Honza > People that care: > - Mirror and RAID people that need on disk consistency. > - Network storage that wants data checksum. > - DIF/DIX people > - ... > > I for one know nothing of the subject but am a RAID person and would > like a solution that does not force me to copy the complete data load. > > Please lets get all the VM VFS and drivers people in one room and see > if we can have a Linux solution to this problem -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
