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SUNRPC: Clean up open coded setting of the xdr_stream 'nwords' field 

Move the setting of the xdr_stream 'nwords' field into the helpers that
reset the xdr_stream cursor.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2020-12-08 15:02:14 -05:00
parent e43ac22b83
commit 5a5f1c2c2c
1 changed files with 16 additions and 13 deletions
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29
net/sunrpc/xdr.c
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@ -1183,6 +1183,15 @@ static unsigned int xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov,
return len - base;
}
static unsigned int xdr_set_tail_base(struct xdr_stream *xdr,
unsigned int base, unsigned int len)
{
struct xdr_buf *buf = xdr->buf;
xdr_stream_set_pos(xdr, base + buf->page_len + buf->head->iov_len);
return xdr_set_iov(xdr, buf->tail, base, len);
}
static unsigned int xdr_set_page_base(struct xdr_stream *xdr,
unsigned int base, unsigned int len)
{
@ -1201,6 +1210,7 @@ static unsigned int xdr_set_page_base(struct xdr_stream *xdr,
if (len > maxlen)
len = maxlen;
xdr_stream_page_set_pos(xdr, base);
base += xdr->buf->page_base;
pgnr = base >> PAGE_SHIFT;
@ -1223,7 +1233,7 @@ static void xdr_set_page(struct xdr_stream *xdr, unsigned int base,
{
if (xdr_set_page_base(xdr, base, len) == 0) {
base -= xdr->buf->page_len;
xdr_set_iov(xdr, xdr->buf->tail, base, len);
xdr_set_tail_base(xdr, base, len);
}
}
@ -1236,7 +1246,7 @@ static void xdr_set_next_page(struct xdr_stream *xdr)
if (newbase < xdr->buf->page_len)
xdr_set_page_base(xdr, newbase, xdr_stream_remaining(xdr));
else
xdr_set_iov(xdr, xdr->buf->tail, 0, xdr_stream_remaining(xdr));
xdr_set_tail_base(xdr, 0, xdr_stream_remaining(xdr));
}
static bool xdr_set_next_buffer(struct xdr_stream *xdr)
@ -1388,7 +1398,7 @@ static void xdr_realign_pages(struct xdr_stream *xdr)
if (iov->iov_len > cur) {
copied = xdr_shrink_bufhead(buf, cur);
trace_rpc_xdr_alignment(xdr, cur, copied);
xdr->nwords = XDR_QUADLEN(buf->len - cur);
xdr_set_page(xdr, 0, buf->page_len);
}
}
@ -1396,7 +1406,6 @@ static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
{
struct xdr_buf *buf = xdr->buf;
unsigned int nwords = XDR_QUADLEN(len);
unsigned int cur = xdr_stream_pos(xdr);
unsigned int copied;
if (xdr->nwords == 0)
@ -1413,7 +1422,6 @@ static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
/* Truncate page data and move it into the tail */
copied = xdr_shrink_pagelen(buf, len);
trace_rpc_xdr_alignment(xdr, len, copied);
xdr->nwords = XDR_QUADLEN(buf->len - cur);
}
return len;
}
@ -1439,12 +1447,10 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
if (pglen == 0)
return 0;
xdr->nwords -= nwords;
base = (nwords << 2) - pglen;
end = xdr_stream_remaining(xdr) - pglen;
if (xdr_set_iov(xdr, xdr->buf->tail, base, end) == 0)
xdr->nwords = 0;
xdr_set_tail_base(xdr, base, end);
return len <= pglen ? len : pglen;
}
EXPORT_SYMBOL_GPL(xdr_read_pages);
@ -1478,15 +1484,13 @@ unsigned int xdr_align_data(struct xdr_stream *xdr, unsigned int offset,
/* Move page data to the left */
shift = from - offset;
xdr_buf_pages_shift_left(buf, from, len, shift);
xdr->buf->len -= shift;
xdr->nwords -= XDR_QUADLEN(shift);
bytes = xdr_stream_remaining(xdr);
if (length > bytes)
length = bytes;
bytes -= length;
xdr->nwords -= XDR_QUADLEN(length);
xdr->buf->len -= shift;
xdr_set_page(xdr, offset + length, bytes);
return length;
}
@ -1508,12 +1512,11 @@ unsigned int xdr_expand_hole(struct xdr_stream *xdr, unsigned int offset,
shift = to - from;
xdr_buf_try_expand(buf, shift);
xdr_buf_pages_shift_right(buf, from, buflen, shift);
xdr_stream_page_set_pos(xdr, to);
xdr_set_page(xdr, to, xdr_stream_remaining(xdr));
} else if (to != from)
xdr_align_data(xdr, to, 0);
xdr_buf_pages_zero(buf, offset, length);
xdr_set_page(xdr, to, xdr_stream_remaining(xdr));
return length;
}
EXPORT_SYMBOL_GPL(xdr_expand_hole);