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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>
This commit is contained in:
Shirley Ma 2014-05-28 10:34:24 -04:00 committed by Anna Schumaker
parent 5bc4bc7292
commit 196c69989d
1 changed files with 6 additions and 0 deletions
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6
net/sunrpc/xprtrdma/rpc_rdma.c
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@ -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);