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SUNRPC xprtrdma: fix XDR tail buf marshalling for all ops 

rpcrdma_convert_iovs is passed an xdr_buf representing either an RPC
request or an RPC reply. In the case of a request, several
calculations and tests involving pos are unnecessary. In the case of a
reply, several calculations and tests involving pos are incorrect (the
code tests pos against the reply xdr buf's len field, which is always
0 at the time rpcrdma_convert_iovs is executed). This change removes
the incorrect/unnecessary calculations and tests involving pos.

This fixes an observed problem when reading certain file sizes over
NFS/RDMA.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: Tom Talpey <talpey@netapp.com>
Signed-off-by: James Lentini <jlentini@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
James Lentini 2007-12-10 11:24:48 -05:00 committed by Trond Myklebust
parent 5cef338b30
commit 50e1092b3a
1 changed files with 1 additions and 8 deletions
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9
net/sunrpc/xprtrdma/rpc_rdma.c
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@ -92,7 +92,6 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
seg[n].mr_page = NULL;
seg[n].mr_offset = xdrbuf->head[0].iov_base;
seg[n].mr_len = xdrbuf->head[0].iov_len;
pos += xdrbuf->head[0].iov_len;
++n;
}
@ -104,7 +103,6 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
seg[n].mr_len = min_t(u32,
PAGE_SIZE - xdrbuf->page_base, xdrbuf->page_len);
len = xdrbuf->page_len - seg[n].mr_len;
pos += len;
++n;
p = 1;
while (len > 0) {
@ -119,20 +117,15 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
}
}
if (pos < xdrbuf->len && xdrbuf->tail[0].iov_len) {
if (xdrbuf->tail[0].iov_len) {
if (n == nsegs)
return 0;
seg[n].mr_page = NULL;
seg[n].mr_offset = xdrbuf->tail[0].iov_base;
seg[n].mr_len = xdrbuf->tail[0].iov_len;
pos += xdrbuf->tail[0].iov_len;
++n;
}
if (pos < xdrbuf->len)
dprintk("RPC: %s: marshaled only %d of %d\n",
__func__, pos, xdrbuf->len);
return n;
}