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    Subject[PATCH 07/20] nfs: add a comment explaining the use of PG_private in the NFS client
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    Add a little comment explaining the use of PG_private in the NFS client.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    CC: Trond Myklebust <trond.myklebust@fys.uio.no>
    ---
    fs/nfs/write.c | 5 +++++
    1 file changed, 5 insertions(+)

    Index: linux-2.6/fs/nfs/write.c
    ===================================================================
    --- linux-2.6.orig/fs/nfs/write.c
    +++ linux-2.6/fs/nfs/write.c
    @@ -417,6 +417,11 @@ static int nfs_inode_add_request(struct
    if (nfs_have_delegation(inode, FMODE_WRITE))
    nfsi->change_attr++;
    }
    + /*
    + * The PG_private bit is unfortunately needed if we want to fix the
    + * hole in the mmap semantics. If we do not set it, then the VM will
    + * fail to call the "releasepage" address ops.
    + */
    SetPagePrivate(req->wb_page);
    nfsi->npages++;
    atomic_inc(&req->wb_count);
    --

    -
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