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SUNRPC: Cleanup xs_tcp_read_common()

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Simplify the code to avoid a full copy of the struct xdr_skb_reader.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-08-13 02:13:45 -04:00
parent 8d6f97d698
commit 040249dfbe
1 changed files with 8 additions and 17 deletions
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23
net/sunrpc/xprtsock.c
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@ -1287,25 +1287,12 @@ static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
}
len = desc->count;
if (len > transport->tcp_reclen - transport->tcp_offset) {
struct xdr_skb_reader my_desc;
len = transport->tcp_reclen - transport->tcp_offset;
memcpy(&my_desc, desc, sizeof(my_desc));
my_desc.count = len;
r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
&my_desc, xdr_skb_read_bits);
desc->count -= r;
desc->offset += r;
} else
if (len > transport->tcp_reclen - transport->tcp_offset)
desc->count = transport->tcp_reclen - transport->tcp_offset;
r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
desc, xdr_skb_read_bits);
if (r > 0) {
transport->tcp_copied += r;
transport->tcp_offset += r;
}
if (r != len) {
if (desc->count) {
/* Error when copying to the receive buffer,
* usually because we weren't able to allocate
* additional buffer pages. All we can do now
@ -1325,6 +1312,10 @@ static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
return;
}
transport->tcp_copied += r;
transport->tcp_offset += r;
desc->count = len - r;
dprintk("RPC: XID %08x read %zd bytes\n",
ntohl(transport->tcp_xid), r);
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "