[PATCH v2 04/11] nfs: shorten and simplify rpc_add_credentials a bit

[Uwe Kleine-König]

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 fs/nfs.c | 26 +++++---------------------
 1 file changed, 5 insertions(+), 21 deletions(-)

diff --git a/fs/nfs.c b/fs/nfs.c
index 76d8c0595db4..54dda261c0b1 100644
--- a/fs/nfs.c
+++ b/fs/nfs.c
@@ -224,34 +224,18 @@ out_overflow:
  */
 static uint32_t *rpc_add_credentials(uint32_t *p)
 {
-	int hl;
-	int hostnamelen = 0;
-
 	/*
-	 * Here's the executive summary on authentication requirements of the
-	 * various NFS server implementations:	Linux accepts both AUTH_NONE
-	 * and AUTH_UNIX authentication (also accepts an empty hostname field
-	 * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
-	 * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
-	 * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
-	 * it (if the BOOTP/DHCP reply didn't give one, just use an empty
-	 * hostname).
+	 * *BSD refuses AUTH_NONE, so use AUTH_UNIX. An empty hostname is OK for
+	 * both Linux and *BSD.
 	 */
 
-	hl = (hostnamelen + 3) & ~3;
-
 	/* Provide an AUTH_UNIX credential.  */
 	*p++ = htonl(1);		/* AUTH_UNIX */
-	*p++ = htonl(hl + 20);		/* auth length */
+	*p++ = htonl(20);		/* auth length: 20 + strlen(hostname) */
 	*p++ = htonl(0);		/* stamp */
-	*p++ = htonl(hostnamelen);	/* hostname string */
-
-	if (hostnamelen & 3)
-		*(p + hostnamelen / 4) = 0; /* add zero padding */
-
-	/* memcpy(p, hostname, hostnamelen); */ /* empty hostname */
+	*p++ = htonl(0);		/* hostname string length */
+	/* memcpy(p, "", 0); p += 0; <- empty host name */
 
-	p += hl / 4;
 	*p++ = 0;			/* uid */
 	*p++ = 0;			/* gid */
 	*p++ = 0;			/* auxiliary gid list */
-- 
1.8.5.2