NSM: Avoid return code checking in NSM XDR encoder functions
Clean up.
The trend in the other XDR encoder functions is to BUG() when encoding
problems occur, since a problem here is always due to a local coding
error. Then, instead of a status, zero is unconditionally returned.
Update the NSM XDR encoders to behave this way.
To finish the update, use the new-style be32_to_cpup() and
cpu_to_be32() macros, and compute the buffer sizes using raw integers
instead of sizeof(). This matches the conventions used in other XDR
functions
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index e0c9189..d812818 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -401,26 +401,22 @@
* Status Monitor wire protocol.
*/
-static int encode_nsm_string(struct xdr_stream *xdr, const char *string)
+static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
{
const u32 len = strlen(string);
__be32 *p;
- if (unlikely(len > SM_MAXSTRLEN))
- return -EIO;
- p = xdr_reserve_space(xdr, sizeof(u32) + len);
- if (unlikely(p == NULL))
- return -EIO;
+ BUG_ON(len > SM_MAXSTRLEN);
+ p = xdr_reserve_space(xdr, 4 + len);
xdr_encode_opaque(p, string, len);
- return 0;
}
/*
* "mon_name" specifies the host to be monitored.
*/
-static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
{
- return encode_nsm_string(xdr, argp->mon_name);
+ encode_nsm_string(xdr, argp->mon_name);
}
/*
@@ -429,35 +425,25 @@
* (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
* has changed.
*/
-static int encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
{
- int status;
__be32 *p;
- status = encode_nsm_string(xdr, utsname()->nodename);
- if (unlikely(status != 0))
- return status;
- p = xdr_reserve_space(xdr, 3 * sizeof(u32));
- if (unlikely(p == NULL))
- return -EIO;
- *p++ = htonl(argp->prog);
- *p++ = htonl(argp->vers);
- *p++ = htonl(argp->proc);
- return 0;
+ encode_nsm_string(xdr, utsname()->nodename);
+ p = xdr_reserve_space(xdr, 4 + 4 + 4);
+ *p++ = cpu_to_be32(argp->prog);
+ *p++ = cpu_to_be32(argp->vers);
+ *p = cpu_to_be32(argp->proc);
}
/*
* The "mon_id" argument specifies the non-private arguments
* of an NSMPROC_MON or NSMPROC_UNMON call.
*/
-static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
{
- int status;
-
- status = encode_mon_name(xdr, argp);
- if (unlikely(status != 0))
- return status;
- return encode_my_id(xdr, argp);
+ encode_mon_name(xdr, argp);
+ encode_my_id(xdr, argp);
}
/*
@@ -465,28 +451,23 @@
* by the NSMPROC_MON call. This information will be supplied in the
* NLMPROC_SM_NOTIFY call.
*/
-static int encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
+static void encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
{
__be32 *p;
p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
- if (unlikely(p == NULL))
- return -EIO;
xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
- return 0;
}
static int xdr_enc_mon(struct rpc_rqst *req, __be32 *p,
const struct nsm_args *argp)
{
struct xdr_stream xdr;
- int status;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
- status = encode_mon_id(&xdr, argp);
- if (unlikely(status))
- return status;
- return encode_priv(&xdr, argp);
+ encode_mon_id(&xdr, argp);
+ encode_priv(&xdr, argp);
+ return 0;
}
static int xdr_enc_unmon(struct rpc_rqst *req, __be32 *p,
@@ -495,7 +476,8 @@
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
- return encode_mon_id(&xdr, argp);
+ encode_mon_id(&xdr, argp);
+ return 0;
}
static int xdr_dec_stat_res(struct rpc_rqst *rqstp, __be32 *p,
@@ -504,11 +486,11 @@
struct xdr_stream xdr;
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
- p = xdr_inline_decode(&xdr, 2 * sizeof(u32));
+ p = xdr_inline_decode(&xdr, 4 + 4);
if (unlikely(p == NULL))
return -EIO;
- resp->status = ntohl(*p++);
- resp->state = ntohl(*p);
+ resp->status = be32_to_cpup(p++);
+ resp->state = be32_to_cpup(p);
dprintk("lockd: xdr_dec_stat_res status %d state %d\n",
resp->status, resp->state);
@@ -521,10 +503,10 @@
struct xdr_stream xdr;
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
- p = xdr_inline_decode(&xdr, sizeof(u32));
+ p = xdr_inline_decode(&xdr, 4);
if (unlikely(p == NULL))
return -EIO;
- resp->state = ntohl(*p);
+ resp->state = be32_to_cpup(p);
dprintk("lockd: xdr_dec_stat state %d\n", resp->state);
return 0;