1 files changed, 31 insertions, 1 deletions

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 2da255f0247f..3961524fd4ab 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -40,10 +40,40 @@ static const struct rpc_call_ops nfs_read_partial_ops;
 static const struct rpc_call_ops nfs_read_full_ops;
 
 static kmem_cache_t *nfs_rdata_cachep;
-mempool_t *nfs_rdata_mempool;
+static mempool_t *nfs_rdata_mempool;
 
 #define MIN_POOL_READ   (32)
 
+struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
+{
+        struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
+
+        if (p) {
+                memset(p, 0, sizeof(*p));
+                INIT_LIST_HEAD(&p->pages);
+                if (pagecount < NFS_PAGEVEC_SIZE)
+                        p->pagevec = &p->page_array[0];
+                else {
+                        size_t size = ++pagecount * sizeof(struct page *);
+                        p->pagevec = kmalloc(size, GFP_NOFS);
+                        if (p->pagevec) {
+                                memset(p->pagevec, 0, size);
+                        } else {
+                                mempool_free(p, nfs_rdata_mempool);
+                                p = NULL;
+                        }
+                }
+        }
+        return p;
+}
+
+void nfs_readdata_free(struct nfs_read_data *p)
+{
+        if (p && (p->pagevec != &p->page_array[0]))
+                kfree(p->pagevec);
+        mempool_free(p, nfs_rdata_mempool);
+}
+
 void nfs_readdata_release(void *data)
 {
         nfs_readdata_free(data);