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    SubjectRe: [Lsf10-pc] [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tag on ext2 write)
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    On Fri, Jun 04, 2010 at 06:23:32PM +0200, Jan Kara wrote:
    > 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.

    Will the same work for the NFS server checksumming page data in read
    replies?

    --b.

    > 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@suse.cz>
    > SUSE Labs, CR
    > _______________________________________________
    > Lsf10-pc mailing list
    > Lsf10-pc@lists.linux-foundation.org
    > https://lists.linux-foundation.org/mailman/listinfo/lsf10-pc


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