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  1. 24 Sep, 2008 2 commits
    • Tejun Heo's avatar
      9p-trans_fd: fix trans_fd::p9_conn_destroy() · 7dc5d24b
      Tejun Heo authored 
      p9_conn_destroy() first kills all current requests by calling
p9_conn_cancel(), then waits for the request list to be cleared by
waiting on p9_conn->equeue.  After that, polling is stopped and the
trans is destroyed.  This sequence has a few problems.

* Read and write works were never cancelled and the p9_conn can be
  destroyed while the works are running as r/w works remove requests
  from the list and dereference the p9_conn from them.

* The list emptiness wait using p9_conn->equeue wouldn't trigger
  because p9_conn_cancel() always clears all the lists and the only
  way the wait can be triggered is to have another task to issue a
  request between the slim window between p9_conn_cancel() and the
  wait, which isn't safe under the current implementation with or
  without the wait.

This patch fixes the problem by first stopping poll, which can
schedule r/w works, first and cancle r/w works which guarantees that
r/w works are not and will not run from that point and then calling
p9_conn_cancel() and do the rest of destruction.
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      7dc5d24b
    • Tejun Heo's avatar
      9p: implement proper trans module refcounting and unregistration · 72029fe8
      Tejun Heo authored 
      9p trans modules aren't refcounted nor were they unregistered
properly.  Fix it.

* Add 9p_trans_module->owner and reference the module on each trans
  instance creation and put it on destruction.

* Protect v9fs_trans_list with a spinlock.  This isn't strictly
  necessary as the list is manipulated only during module loading /
  unloading but it's a good idea to make the API safe.

* Unregister trans modules when the corresponding module is being
  unloaded.

* While at it, kill unnecessary EXPORT_SYMBOL on p9_trans_fd_init().
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
      72029fe8
  3. 21 Sep, 2008 11 commits
  5. 20 Sep, 2008 10 commits
  7. 19 Sep, 2008 17 commits