NFS: create struct nfs_page_array

Both nfs_read_data and nfs_write_data devote several fields which
can be combined into a single shared struct.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index d21fceaa9f62..d349bd4c48db 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -26,6 +26,19 @@
 
 static struct kmem_cache *nfs_page_cachep;
 
+bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
+{
+        p->npages = pagecount;
+        if (pagecount <= ARRAY_SIZE(p->page_array))
+                p->pagevec = p->page_array;
+        else {
+                p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
+                if (!p->pagevec)
+                        p->npages = 0;
+        }
+        return p->pagevec != NULL;
+}
+
 static inline struct nfs_page *
 nfs_page_alloc(void)
 {