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SUNRPC: Destroy transport from the system workqueue

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The transport may need to flush transport connect and receive tasks
that are running on rpciod. In order to do so safely, we need to
ensure that the caller of cancel_work_sync() etc is not itself
running on rpciod.
Do so by running the destroy task from the system workqueue.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-10-19 12:13:10 -04:00
parent 4c625a974f
commit 528fd3547b
1 changed files with 24 additions and 10 deletions
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34
net/sunrpc/xprt.c
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@ -1445,6 +1445,23 @@ out:
return xprt;
}
static void xprt_destroy_cb(struct work_struct *work)
{
struct rpc_xprt *xprt =
container_of(work, struct rpc_xprt, task_cleanup);
rpc_xprt_debugfs_unregister(xprt);
rpc_destroy_wait_queue(&xprt->binding);
rpc_destroy_wait_queue(&xprt->pending);
rpc_destroy_wait_queue(&xprt->sending);
rpc_destroy_wait_queue(&xprt->backlog);
kfree(xprt->servername);
/*
* Tear down transport state and free the rpc_xprt
*/
xprt->ops->destroy(xprt);
}
/**
* xprt_destroy - destroy an RPC transport, killing off all requests.
* @xprt: transport to destroy
@ -1454,22 +1471,19 @@ static void xprt_destroy(struct rpc_xprt *xprt)
{
dprintk("RPC: destroying transport %p\n", xprt);
/* Exclude transport connect/disconnect handlers */
/*
* Exclude transport connect/disconnect handlers and autoclose
*/
wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE);
del_timer_sync(&xprt->timer);
rpc_xprt_debugfs_unregister(xprt);
rpc_destroy_wait_queue(&xprt->binding);
rpc_destroy_wait_queue(&xprt->pending);
rpc_destroy_wait_queue(&xprt->sending);
rpc_destroy_wait_queue(&xprt->backlog);
cancel_work_sync(&xprt->task_cleanup);
kfree(xprt->servername);
/*
* Tear down transport state and free the rpc_xprt
* Destroy sockets etc from the system workqueue so they can
* safely flush receive work running on rpciod.
*/
xprt->ops->destroy(xprt);
INIT_WORK(&xprt->task_cleanup, xprt_destroy_cb);
schedule_work(&xprt->task_cleanup);
}
static void xprt_destroy_kref(struct kref *kref)