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authorTrond Myklebust <trond.myklebust@hammerspace.com>2020-11-22 04:46:18 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2020-12-02 22:05:53 +0300
commit9ed5af268e88f6e5b65376be98d652b37cb20d7b (patch)
treef5b157f23446a5bfe5ef99f92a5085ba40d28e9d /net/sunrpc
parent1d97316692f708de755655ac1cfd704d7a55843f (diff)
downloadlinux-9ed5af268e88f6e5b65376be98d652b37cb20d7b.tar.xz
SUNRPC: Clean up the handling of page padding in rpc_prepare_reply_pages()
rpc_prepare_reply_pages() currently expects the 'hdrsize' argument to contain the length of the data that we expect to want placed in the head kvec plus a count of 1 word of padding that is placed after the page data. This is very confusing when trying to read the code, and sometimes leads to callers adding an arbitrary value of '1' just in order to satisfy the requirement (whether or not the page data actually needs such padding). This patch aims to clarify the code by changing the 'hdrsize' argument to remove that 1 word of padding. This means we need to subtract the padding from all the existing callers. Fixes: 02ef04e432ba ("NFS: Account for XDR pad of buf->pages") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/clnt.c5
-rw-r--r--net/sunrpc/xdr.c3
2 files changed, 1 insertions, 7 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 3259120462ed..612f0a641f4c 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1251,10 +1251,7 @@ void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
unsigned int base, unsigned int len,
unsigned int hdrsize)
{
- /* Subtract one to force an extra word of buffer space for the
- * payload's XDR pad to fall into the rcv_buf's tail iovec.
- */
- hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign - 1;
+ hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign;
xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len);
trace_rpc_xdr_reply_pages(req->rq_task, &req->rq_rcv_buf);
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 3ce0a5daa9eb..5a450055469f 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -193,9 +193,6 @@ xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
tail->iov_base = buf + offset;
tail->iov_len = buflen - offset;
- if ((xdr->page_len & 3) == 0)
- tail->iov_len -= sizeof(__be32);
-
xdr->buflen += len;
}
EXPORT_SYMBOL_GPL(xdr_inline_pages);