[LU-17444] llapi_open_by_fid leaks mount point fd

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Dominique Martinet
• Reporter: Dominique Martinet

Description

Commit 7154244354e3 ("LU-16786 utils: Replace open call to WANT_FD") replaced get_root_path() with llapi_root_path_open(), but the later always opens or dup a fd and requires a close, so worklaods that use open by fid would very quickly run out of fd because of many many dup() calls on the mnt fd