xprtrdma: Allocate missing pagelist

GETACL relies on transport layer to alloc memory for reply buffer.
However xprtrdma assumes that the reply buffer (pagelist) has been
pre-allocated in upper layer. This problem was reported by IOL OFA lab
test on PPC.

Signed-off-by: Shirley Ma <shirley.ma@oracle.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Edward Mossman <emossman@iol.unh.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 436d229f31dc4c3092f3c65e90d240ddb5b34502..dc4a826192b6418e70372ffd3b22ae523e205c3d 100644 (file)
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -99,6 +99,12 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
        page_base = xdrbuf->page_base & ~PAGE_MASK;
        p = 0;
        while (len && n < nsegs) {
+               if (!ppages[p]) {
+                       /* alloc the pagelist for receiving buffer */
+                       ppages[p] = alloc_page(GFP_ATOMIC);
+                       if (!ppages[p])
+                               return 0;
+               }
                seg[n].mr_page = ppages[p];
                seg[n].mr_offset = (void *)(unsigned long) page_base;
                seg[n].mr_len = min_t(u32, PAGE_SIZE - page_base, len);