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NFS: add nfs_sb_deactive_async to avoid deadlock

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Use nfs_sb_deactive_async instead of nfs_sb_deactive when in a workqueue
context.  This avoids a deadlock where rpc_shutdown_client loops forever
in a workqueue kworker context, trying to kill all RPC tasks associated with
the client, while one or more of these tasks have already been assigned to the
same kworker (and will never run rpc_exit_task).

This approach is needed because RPC tasks that have already been assigned
to a kworker by queue_work cannot be canceled, as explained in the comment
for workqueue.c:insert_wq_barrier.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
[Trond: add module_get/put.]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Weston Andros Adamson 2012-10-30 17:01:39 -04:00 • committed by Trond Myklebust
parent 97a5486826
commit 324d003b0c
5 changed files with 56 additions and 3 deletions
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2
fs/nfs/unlink.c
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@ -95,7 +95,7 @@ static void nfs_async_unlink_release(void *calldata)
nfs_dec_sillycount(data->dir);
nfs_free_unlinkdata(data);
nfs_sb_deactive(sb);
nfs_sb_deactive_async(sb);
}
static void nfs_unlink_prepare(struct rpc_task *task, void *calldata)