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orangefs: have ..._clean_interrupted_...() wait for copy to/from daemon

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* turn all those list_del(&op->list) into list_del_init()
* don't pick ops that are already given up in control device
  ->read()/->write_iter().
* have orangefs_clean_interrupted_operation() notice if op is currently
  being copied to/from daemon (by said ->read()/->write_iter()) and
  wait for that to finish.
* when we are done copying to/from daemon and find that it had been
  given up while we were doing that, wake the waiting ..._clean_interrupted_...

As the result, we are guaranteed that orangefs_clean_interrupted_operation(op)
doesn't return until nobody else can see op.  Moreover, we don't need to play
with op refcounts anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Al Viro
2016-02-18 18:59:44 -05:00
committed by Mike Marshall
parent 5964c1b839
commit 05a50a5be8
3 changed files with 21 additions and 23 deletions
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2
fs/orangefs/orangefs-kernel.h
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@@ -259,7 +259,7 @@ static inline void set_op_state_purged(struct orangefs_kernel_op_s *op)
{
spin_lock(&op->lock);
if (unlikely(op_is_cancel(op))) {
list_del(&op->list);
list_del_init(&op->list);
spin_unlock(&op->lock);
put_cancel(op);
} else {