staging/lustre/osc: shorten IO calling path
staging/lustre/osc: shorten IO calling path

By using osc_io_unplug_aync() for osc_queue_sync_pages() to shorten
the IO calling path, to reduce the chance of stack overflow.

Signed-off-by: Bobi Jam <7d01b33a7d567b444ad639b417798985dff55ff9@intel.com>
Signed-off-by: Bob Glossman <67e548fbeaf191ffde66fc5ef46cd49dbf7d7d6a@intel.com>
Reviewed-on: http://review.whamcloud.com/11612
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3188
Reviewed-by: Jinshan Xiong <4f9c0b864b7f9eb8a22fd0e8ad685c34bbc01268@intel.com>
Reviewed-by: Niu Yawei <9a4306993a9b05dce7bd8a5e926759eea151be9f@intel.com>
Signed-off-by: Oleg Drokin <65b2ca07820e940f66d8901813c729ec10a548f5@intel.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs