tree b199a039df4aacd26224302b7c29193171e4d444
parent 5980fc966bb347801f3fcc39a2ef2a1e14fbf8cb
author Jeff Layton <jlayton@redhat.com> 1311697217 -0400
committer Steve French <sfrench@us.ibm.com> 1312147280 +0000

cifs: simplify refcounting for oplock breaks

Currently, we take a sb->s_active reference and a cifsFileInfo reference
when an oplock break workqueue job is queued. This is unnecessary and
more complicated than it needs to be. Also as Al points out,
deactivate_super has non-trivial locking implications so it's best to
avoid that if we can.

Instead, just cancel any pending oplock breaks for this filehandle
synchronously in cifsFileInfo_put after taking it off the lists.
That should ensure that this job doesn't outlive the structures it
depends on.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>