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    SubjectRe: [PATCH 0/4] 2.6.21-rc7 NFS writes: fix a series of issues
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    On Tue, 2007-04-17 at 21:19 -0400, Trond Myklebust wrote:
    > I've split the issues introduced by the 2.6.21-rcX write code up into 4
    > subproblems.
    >
    > The first patch is just a cleanup in order to ease review.
    >
    > Patch number 2 ensures that we never release the PG_writeback flag until
    > _after_ we've either discarded the unstable request altogether, or put it
    > on the nfs_inode's commit or dirty lists.
    >
    > Patch number 3 fixes the 'desynchronized value of nfs_i.ncommit' error. It
    > uses the PG_NEED_COMMIT flag as an indicator for whether or not the request
    > may be redirtied.
    >
    > Patch number 4 protects the NFS '.set_page_dirty' address_space operation
    > against races with nfs_inode_add_request.

    Ok, stuck them in, and my debug patch from yesterday, just in case...

    However, I can't seem to run long enough to establish whether the
    problem is gone. It deadlocks between 10-30 minutes due to missing IO
    completions, whereas yesterday it took between 45-60 minutes to trigger
    the 'desynchronized value of nfs_i.ncommit' messages.

    I will continue trying go get a good run, however if you got some
    (perhaps experimental .22) patches you want me to try..



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