LU-3190 mdd: not return linkEA for dead obj

1. Not return linkEA for dead object.
2. Check lma_self_fid to match object FID after get
real LMA from the object.
3. clear oi cache during oi delete.
4. correct error value if ldlm_handle_enqueue return
some value other than ldlm_err_t(for example -ESTALE).

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: I1d2345eb01ff58584ffba31f86bb408396780aeb
Reviewed-on: http://review.whamcloud.com/6252
Tested-by: Hudson
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
LU-3280 ldlm: suppress useless lock RPC for layout

In ldlm_lock_decref_internal() when l_lvb_data is freed to
reduce memory consumption, LDLM_FL_LVB_READY is not
cleared, so later when the lock is reused lvb is not
updated. But clearing LDLM_FL_LVB_READY forces layout refetch
at each file access, so the better is to remove the optimization.
The use case is after a restore in HSM.

Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Change-Id: I3aa56cf39fe34941d227400410b27db32479b1b1
Reviewed-on: http://review.whamcloud.com/6268
Tested-by: Hudson
Reviewed-by: Fan Yong <fan.yong@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
LU-3281 osc: some cleanup to reduce stack overflow chance

ptlrpcd_add_req() will wake_up other process, do not hold a spinlock
before calling ptlrpcd_queue_work()->ptlrpcd_add_req().

If current process is allocating memory, memory shrinker could get to
osc_lru_del(), don't call osc_lru_shrink() further since it could
lead a long calling chain.

Use static string OES_STRINGS in OSC_EXTENT_DUMP() to reduce stack
footprint.

Alloc crattr on heap for osc_build_rpc() to reduce stack footprint.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: I1a1ce0b46850773a2ae45ce16be6b708adc40ab8
Reviewed-on: http://review.whamcloud.com/6270
Tested-by: Hudson
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>