Commit 68717908 authored Jan 26, 2010 by Chuck Lever Committed by J. Bruce Fields Jan 26, 2010

SUNRPC: NFS kernel APIs shouldn't return ENOENT for "transport not found"



write_ports() converts svc_create_xprt()'s ENOENT error return to
EPROTONOSUPPORT so that rpc.nfsd (in user space) can report an error
message that makes sense.

It turns out that several of the other kernel APIs rpc.nfsd use can
also return ENOENT from svc_create_xprt(), by way of lockd_up().

On the client side, an NFSv2 or NFSv3 mount request can also return
the result of lockd_up().  This error may also be returned during an
NFSv4 mount request, since the NFSv4 callback service uses
svc_create_xprt() to create the callback listener.  An ENOENT error
return results in a confusing error message from the mount command.

Let's have svc_create_xprt() return EPROTONOSUPPORT instead of ENOENT.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

parent d6783b2b

fs/nfsd/nfsctl.c

+1 −5

Original line number	Diff line number	Diff line
		@@ -1002,12 +1002,8 @@ static ssize_t __write_ports_addxprt(char *buf)

		err = svc_create_xprt(nfsd_serv, transport,
		PF_INET, port, SVC_SOCK_ANONYMOUS);
		if (err < 0) {
		/* Give a reasonable perror msg for bad transport string */
		if (err == -ENOENT)
		err = -EPROTONOSUPPORT;
		if (err < 0)
		return err;
		}
		return 0;
		}

net/sunrpc/svc_xprt.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -235,7 +235,10 @@ int svc_create_xprt(struct svc_serv serv, const char xprt_name,
		err:
		spin_unlock(&svc_xprt_class_lock);
		dprintk("svc: transport %s not found\n", xprt_name);
		return -ENOENT;

		/* This errno is exposed to user space. Provide a reasonable
		* perror msg for a bad transport. */
		return -EPROTONOSUPPORT;
		}
		EXPORT_SYMBOL_GPL(svc_create_xprt);

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