From: Sebastian Riemer Date: Thu, 21 Feb 2013 02:28:09 +0000 (+1100) Subject: md: protect against crash upon fsync on ro array X-Git-Tag: v3.9-rc2~28^2~11 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bbfa57c0f2243a7c31fd248d22e9861a2802cad5;p=pandora-kernel.git md: protect against crash upon fsync on ro array If an fsync occurs on a read-only array, we need to send a completion for the IO and may not increment the active IO count. Otherwise, we hit a bug trace and can't stop the MD array anymore. By advice of Christoph Hellwig we return success upon a flush request but we return -EROFS for other writes. We detect flush requests by checking if the bio has zero sectors. This patch is suitable to any -stable kernel to which it applies. Cc: Christoph Hellwig Cc: Ben Hutchings Cc: NeilBrown Cc: stable@vger.kernel.org Signed-off-by: Sebastian Riemer Reported-by: Ben Hutchings Acked-by: Paul Menzel Signed-off-by: NeilBrown --- Reading git-diff-tree failed