[PATCH] RPC: Lazy RPC receive buffer allocation
Signed-off-by: Olaf Kirch <okir@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index f86d1ba..65b268d 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -176,7 +176,7 @@
xdr->buflen += len;
}
-void
+int
xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base,
skb_reader_t *desc,
skb_read_actor_t copy_actor)
@@ -190,7 +190,7 @@
len -= base;
ret = copy_actor(desc, (char *)xdr->head[0].iov_base + base, len);
if (ret != len || !desc->count)
- return;
+ return 0;
base = 0;
} else
base -= len;
@@ -210,6 +210,14 @@
do {
char *kaddr;
+ /* ACL likes to be lazy in allocating pages - ACLs
+ * are small by default but can get huge. */
+ if (unlikely(*ppage == NULL)) {
+ *ppage = alloc_page(GFP_ATOMIC);
+ if (unlikely(*ppage == NULL))
+ return -ENOMEM;
+ }
+
len = PAGE_CACHE_SIZE;
kaddr = kmap_atomic(*ppage, KM_SKB_SUNRPC_DATA);
if (base) {
@@ -226,13 +234,15 @@
flush_dcache_page(*ppage);
kunmap_atomic(kaddr, KM_SKB_SUNRPC_DATA);
if (ret != len || !desc->count)
- return;
+ return 0;
ppage++;
} while ((pglen -= len) != 0);
copy_tail:
len = xdr->tail[0].iov_len;
if (base < len)
copy_actor(desc, (char *)xdr->tail[0].iov_base + base, len - base);
+
+ return 0;
}