On 2010-12-01 18:35, Rik van Riel wrote: > On 12/01/2010 11:17 AM, Linus Torvalds wrote: > >> So this is a TOTALLY UNTESTED trivial patch that just adds another >> callback. Does this work? I dunno. But I get the feeling that instead >> of having NFS work around the odd semantics that don't actually match >> what NFS wants, introducing a new callback with much simpler semantics >> would be simpler for everybody, and avoid the need for subtle code. > > Surely somebody can have just looked up the page and > gotten a reference count, right before your ->freepage > call is invoked? > > CPU A CPU B > > look up page > grab refcount > ->freepage > > use contents of page > > Am I overlooking something obvious? > The page is not cached any more at this point therefore looking it up won't find it. Benny -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
