[LU-13852] PCC lookup(IT_OPEN) shouldn't alloc FID in LLITE

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Affects Version/s: Lustre 2.12.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

In ll_lookup_it(IT_OPEN) is called by PCC, it always allocates FID on MDT0 for this new file, but if parent directory is striped or is remote, it will cause this create RPC sent to the MDT where its name hash points to, but not where its FID belongs to, and finally it will trigger assertion in osp_md_create:

[22573.885685] LustreError: 29626:0:(osp_md_object.c:167:osp_md_create()) ASSERTION( attr->la_valid & LA_TYPE ) failed: 
[22573.886840] LustreError: 29626:0:(osp_md_object.c:167:osp_md_create()) LBUG
[22573.887513] Pid: 29626, comm: mdt00_000 3.10.0-1127.8.2.el7_lustre.x86_64 #1 SMP Wed Jul 22 17:22:45 UTC 2020
[22573.888637] Call Trace:
[22573.889029]  [] libcfs_call_trace+0x8c/0xc0 [libcfs]
[22573.890130]  [] lbug_with_loc+0x4c/0xa0 [libcfs]
[22573.891078]  [] osp_md_create+0x442/0x490 [osp]
[22573.892202]  [] lod_sub_create+0x1f5/0x480 [lod]
[22573.893094]  [] lod_create+0x54/0x2d0 [lod]
[22573.893698]  [] mdd_create_object_internal+0xae/0x2f0 [mdd]
[22573.894630]  [] mdd_create_object+0x83/0x940 [mdd]
[22573.895450]  [] mdd_create+0xf3f/0x1690 [mdd]
[22573.896197]  [] mdt_reint_open+0x2413/0x3270 [mdt]
[22573.897188]  [] mdt_reint_rec+0x83/0x210 [mdt]
[22573.897812]  [] mdt_reint_internal+0x720/0xaf0 [mdt]
[22573.898654]  [] mdt_intent_open+0x82/0x3a0 [mdt]
[22573.899522]  [] mdt_intent_opc+0x1ba/0xb40 [mdt]
[22573.900292]  [] mdt_intent_policy+0x1a4/0x360 [mdt]
[22573.901200]  [] ldlm_lock_enqueue+0x3cb/0xad0 [ptlrpc]
[22573.902216]  [] ldlm_handle_enqueue0+0xa56/0x1610 [ptlrpc]
[22573.903120]  [] tgt_enqueue+0x62/0x210 [ptlrpc]
[22573.903966]  [] tgt_request_handle+0x96a/0x1640 [ptlrpc]
[22573.904718]  [] ptlrpc_server_handle_request+0x256/0xb10 [ptlrpc]
[22573.905691]  [] ptlrpc_main+0xb3c/0x14d0 [ptlrpc]
[22573.906627]  [] kthread+0xd1/0xe0
[22573.907307]  [] ret_from_fork_nospec_end+0x0/0x39
[22573.908266]  [] 0xffffffffffffffff
[22573.908991] Kernel panic - not syncing: LBUG

Issue Links

• is related to: LU-14039 Set LA_TYPE while working on osp-mdt device