[LU-10337] Open by handle does not work with unlinked files from multiple nodes

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Severity: 3
• Assignee: Patrick Farrell
• Reporter: Patrick Farrell

Description

When doing open by handle, a requirement is that it be possible to open already open unlinked files. This is important for the sort of userspace NFS server/ i/o forwarder (DVS) uses that file handles are intended for.

This works from one node in Lustre, but not across multiple nodes. This looks fixable - It's possible to open an orphaned file, it seems to be as simple as using the code from mdd_close in mdd_open, particularly rewriting the "EEXIST check" (mdd_is_dead_obj) to check if the object is an orphan and then open it anyway.

Patch forthcoming.

Issue Links

• is related to: LU-11777 interop: sanityn test 102 fails with 'check_fhandle_syscalls failed'