ceph: take i_mutex before getting Fw cap
There is deadlock as illustrated bellow. The fix is taking i_mutex before getting Fw cap reference. write truncate MDS --------------------- -------------------- -------------- get Fw cap lock i_mutex lock i_mutex (blocked) request setattr.size -> <- revoke Fw cap Signed-off-by: NYan, Zheng <zheng.z.yan@intel.com> Reviewed-by: NAlex Elder <elder@inktank.com> Reviewed-by: NSage Weil <sage@inktank.com>
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