[LU-17613] improve client_evicted()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.7
• Severity: 3
• Assignee: Vladimir Saveliev
• Reporter: Vladimir Saveliev

Description

client_evicted() used to check for client eviction based on result of lfs df. When it returned any error but EOPNOTSUPP - that was taken as "client was evicted".

When glibc's realpath() changed to not call stat() which happened in rhel9 (see for ref
stdlib: Sync canonicalize with gnulib BZ #10635 BZ #26592 [BZ
..

• Realpath mishandles EOVERFLOW; stat not needed anyway (BZ#24970).
  )
  lfs df started to return EOPNOTSUPP from lfs_df() which broken few replay-vbr tests.
  Than client_evicted() was changed (LU-16916 tests: fix client_evicted() not to ignore EOPNOTSUPP) and now any not 0 of lfs df is taken as "client was evicted".

How about to do explicit check for client eviction in client_evicted()?