[LU-13190] I/O can fail with -EBADF if fresh client has no connection to OST

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

otherwise it's possible to get -EBADF:

• client sends open|create intent before a connection to OST is established
• MDS replies back without UPDATE bit in LDLM lock, but with the layout
  (MDS doesn't send OBD_MD_FLMODEASIZE and back
• client's cl_default_mds_easize is still 0
• client sends getattr intent with 0-size buffer for EA
• MDS replies with no layout and LAYOUT bit
• client sets local layout to EMPTY
• all subsequent I/O fails with -EBADF