[LU-4539] mdt_intent_opc converts any error from mdt_unpack_req_pack_rep into -EPROTO

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.7.0
• Affects Version/s: Lustre 2.6.0
• Labels: mdt
• Severity: 3
• Assignee: John Hammond
• Reporter: John Hammond

Description

Running on a single node llmount.sh filesystem I often notice that some RPCs are returning -EPROTO which seems odd since client and server are running that same version of Lustre.

LustreError: 11-0: lustre-MDT0000-mdc-ffff8801e3477800: Communicating with 0@lo, operation ldlm_enqueue failed with -71.
LustreError: 11973:0:(mdc_locks.c:917:mdc_enqueue()) ldlm_cli_enqueue: -71
LustreError: 12186:0:(mdc_locks.c:917:mdc_enqueue()) ldlm_cli_enqueue: -71

These are actually errors from mdt_unpack_req_pack_rep() (for example, if HABEO_CORPUS is set but the object does not exist then -ENOENT is returned). But in mdt_intent_opc() any error from mdt_unpack_req_pack_rep() is replaced with -EPROTO. We should return the original rc instead so we don't mislead admins and users.

Issue Links

• is related to: LU-6549 sanityn test_8: sanityn fails: Protocol error