[PATCH] truncate: dirty memory accounting fix
Only (un)account for IO and page-dirtying for devices which have real backing store (ie: not tmpfs or ramdisks). Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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