Return-Path: Received: from mail-gx0-f180.google.com ([209.85.161.180]:60246 "EHLO mail-gx0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756678Ab0LNO6n (ORCPT ); Tue, 14 Dec 2010 09:58:43 -0500 Received: by gxk19 with SMTP id 19so474921gxk.11 for ; Tue, 14 Dec 2010 06:58:43 -0800 (PST) From: Chuck Lever Subject: [PATCH 26/31] NFS: Avoid return code checking in mount XDR encoder functions To: trond.myklebust@netapp.com Cc: linux-nfs@vger.kernel.org Date: Tue, 14 Dec 2010 09:58:40 -0500 Message-ID: <20101214145840.2293.20221.stgit@matisse.1015granger.net> In-Reply-To: <20101214144747.2293.68070.stgit@matisse.1015granger.net> References: <20101214144747.2293.68070.stgit@matisse.1015granger.net> Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 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 mount client 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 Tested-by: J. Bruce Fields --- fs/nfs/mount_clnt.c | 35 +++++++++++++++-------------------- 1 files changed, 15 insertions(+), 20 deletions(-) diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c index 4f981f1..c82547e 100644 --- a/fs/nfs/mount_clnt.c +++ b/fs/nfs/mount_clnt.c @@ -280,20 +280,14 @@ out_call_err: * XDR encode/decode functions for MOUNT */ -static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) +static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) { const u32 pathname_len = strlen(pathname); __be32 *p; - if (unlikely(pathname_len > MNTPATHLEN)) - return -EIO; - - p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len); - if (unlikely(p == NULL)) - return -EIO; + BUG_ON(pathname_len > MNTPATHLEN); + p = xdr_reserve_space(xdr, 4 + pathname_len); xdr_encode_opaque(p, pathname, pathname_len); - - return 0; } static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p, @@ -302,7 +296,8 @@ static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p, struct xdr_stream xdr; xdr_init_encode(&xdr, &req->rq_snd_buf, p); - return encode_mntdirpath(&xdr, dirpath); + encode_mntdirpath(&xdr, dirpath); + return 0; } /* @@ -320,10 +315,10 @@ static int decode_status(struct xdr_stream *xdr, struct mountres *res) u32 status; __be32 *p; - p = xdr_inline_decode(xdr, sizeof(status)); + p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; - status = ntohl(*p); + status = be32_to_cpup(p); for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) { if (mnt_errtbl[i].status == status) { @@ -371,10 +366,10 @@ static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) u32 status; __be32 *p; - p = xdr_inline_decode(xdr, sizeof(status)); + p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; - status = ntohl(*p); + status = be32_to_cpup(p); for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) { if (mnt3_errtbl[i].status == status) { @@ -394,11 +389,11 @@ static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res) u32 size; __be32 *p; - p = xdr_inline_decode(xdr, sizeof(size)); + p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; - size = ntohl(*p++); + size = be32_to_cpup(p); if (size > NFS3_FHSIZE || size == 0) return -EIO; @@ -421,15 +416,15 @@ static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res) if (*count == 0) return 0; - p = xdr_inline_decode(xdr, sizeof(entries)); + p = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return -EIO; - entries = ntohl(*p); + entries = be32_to_cpup(p); dprintk("NFS: received %u auth flavors\n", entries); if (entries > NFS_MAX_SECFLAVORS) entries = NFS_MAX_SECFLAVORS; - p = xdr_inline_decode(xdr, sizeof(u32) * entries); + p = xdr_inline_decode(xdr, 4 * entries); if (unlikely(p == NULL)) return -EIO; @@ -437,7 +432,7 @@ static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res) entries = *count; for (i = 0; i < entries; i++) { - flavors[i] = ntohl(*p++); + flavors[i] = be32_to_cpup(p++); dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]); } *count = i;