[LU-2715] fix dne_sanity.sh to run on multiple mountpoints

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.4.0
• Type: Technical task
• Priority: Minor
• Reporter: Andreas Dilger
• Assignee: Di Wang
• Resolution: Low Priority
• Labels: easy, test

Description

The dne_sanity.sh test currently runs multiple copies of sanity.sh, each one in a separate subdirectory on a separate MDT. However, many subtests are skipped with:

    [ $PARALLEL == "yes" ] && skip "skip parallel run" && return

For some subtests, they are skipped due to the use of do_facet() to affect the running of the MDT or OST, which cannot easily be fixed.

For other subtests, they are skipped due to the use of cancel_lru_locks() to cancel local locks. In this case, it would be possible to have the client(s) use multiple mountpoints, and run a separate sanity.sh for each mountpoint. cancel_lru_locks() would need to be updated to allow cancelling locks for only a single mountpoint.