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svcrpc: implement O_NONBLOCK behavior for use-gss-proxy

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Somebody noticed LTP was complaining about O_NONBLOCK opens of
/proc/net/rpc/use-gss-proxy succeeding and then a following read
hanging.

I'm not convinced LTP really has any business opening random proc files
and expecting them to behave a certain way.  Maybe this isn't really a
bug.

But in any case the O_NONBLOCK behavior could be useful for someone that
wants to test whether gss-proxy is up without waiting.

Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2013-05-24 09:47:49 -04:00
parent 625cdd78d1
commit b161c14440
1 changed files with 4 additions and 2 deletions
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6
net/sunrpc/auth_gss/svcauth_gss.c
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@ -1317,10 +1317,12 @@ static inline bool gssp_ready(struct sunrpc_net *sn)
return false;
}
static int wait_for_gss_proxy(struct net *net)
static int wait_for_gss_proxy(struct net *net, struct file *file)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
if (file->f_flags & O_NONBLOCK && !gssp_ready(sn))
return -EAGAIN;
return wait_event_interruptible(sn->gssp_wq, gssp_ready(sn));
}
@ -1362,7 +1364,7 @@ static ssize_t read_gssp(struct file *file, char __user *buf,
size_t len;
int ret;
ret = wait_for_gss_proxy(net);
ret = wait_for_gss_proxy(net, file);
if (ret)
return ret;