NFSD: Revert 6c41d9a9bd0298002805758216a9c44e38a8500d

For some reason, the wait_on_bit() in nfsd4_deleg_getattr_conflict()
is waiting forever, preventing a clean server shutdown. The
requesting client might also hang waiting for a reply to the
conflicting GETATTR.

Invoking wait_on_bit() in an nfsd thread context is a hazard. The
correct fix is to replace this wait_on_bit() call site with a
mechanism that defers the conflicting GETATTR until the CB_GETATTR
completes or is known to have failed.

That will require some surgery and extended testing and it's late
in the v6.7-rc cycle, so I'm reverting now in favor of trying again
in a subsequent kernel release.

This is my fault: I should have recognized the ramifications of
calling wait_on_bit() in here before accepting this patch.

Thanks to Dai Ngo <[email protected]> for diagnosing the issue.

Reported-by: Wolfgang Walter <[email protected]>
Closes: https://lore.kernel.org/linux-nfs/[email protected]/
Signed-off-by: Chuck Lever <[email protected]>

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