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SUNRPC: Make NFS swap work with multipath

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Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-01-30 20:05:34 -05:00
parent 3227886c65
commit 15001e5a7e
1 changed files with 24 additions and 42 deletions
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66
net/sunrpc/clnt.c
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@ -2554,57 +2554,39 @@ void rpc_show_tasks(struct net *net)
#endif
#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
static int
rpc_clnt_swap_activate_callback(struct rpc_clnt *clnt,
struct rpc_xprt *xprt,
void *dummy)
{
return xprt_enable_swap(xprt);
}
int
rpc_clnt_swap_activate(struct rpc_clnt *clnt)
{
int ret = 0;
struct rpc_xprt *xprt;
if (atomic_inc_return(&clnt->cl_swapper) == 1) {
retry:
rcu_read_lock();
xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
rcu_read_unlock();
if (!xprt) {
/*
* If we didn't get a reference, then we likely are
* racing with a migration event. Wait for a grace
* period and try again.
*/
synchronize_rcu();
goto retry;
}
ret = xprt_enable_swap(xprt);
xprt_put(xprt);
}
return ret;
if (atomic_inc_return(&clnt->cl_swapper) == 1)
return rpc_clnt_iterate_for_each_xprt(clnt,
rpc_clnt_swap_activate_callback, NULL);
return 0;
}
EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
static int
rpc_clnt_swap_deactivate_callback(struct rpc_clnt *clnt,
struct rpc_xprt *xprt,
void *dummy)
{
xprt_disable_swap(xprt);
return 0;
}
void
rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
{
struct rpc_xprt *xprt;
if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) {
retry:
rcu_read_lock();
xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
rcu_read_unlock();
if (!xprt) {
/*
* If we didn't get a reference, then we likely are
* racing with a migration event. Wait for a grace
* period and try again.
*/
synchronize_rcu();
goto retry;
}
xprt_disable_swap(xprt);
xprt_put(xprt);
}
if (atomic_dec_if_positive(&clnt->cl_swapper) == 0)
rpc_clnt_iterate_for_each_xprt(clnt,
rpc_clnt_swap_deactivate_callback, NULL);
}
EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
#endif /* CONFIG_SUNRPC_SWAP */