[LU-1598] Bypass OI lookup in osd_fid_lookup() if it's for file creation

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.3.0
• Affects Version/s: Lustre 2.3.0
• Assignee: Liang Zhen (Inactive)
• Reporter: Liang Zhen (Inactive)

Description

It's unnecessary to call osd_oi_lookup() in osd_fid_lookup if it's a file creation because FID shouldn't never be re-used so we expect it to be not existed, which means we can bypass overhead of OI lookup at here, if it's really a duplicate FID from unexpected reasons, we should be able to detect it later while calling do_create->osd_oi_insert().