nfs: page group syncing in read path
Operations that modify state for a whole page must be syncronized across all requests within a page group. In the read path, this is calling unlock_page and SetPageUptodate. Both of these functions should not be called until all requests in a page group have reached the point where they would call them. This patch should have no effect yet since all page groups currently have one request, but will come into play when pg_test functions are modified to split pages into sub-page regions. Signed-off-by:Weston Andros Adamson <dros@primarydata.com> Signed-off-by:
Trond Myklebust <trond.myklebust@primarydata.com>
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