From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
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. And I don't really know if
this is really a bug.
But in any case perhaps 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@xxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
net/sunrpc/auth_gss/svcauth_gss.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
Considering for 3.10.
diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index 9f0f017..618ccf5 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1313,10 +1313,12 @@ 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));
}
@@ -1358,7 +1360,7 @@ 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;
--
1.7.9.5
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