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>
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 7dc9be1..5c3d77f 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -210,6 +210,7 @@
 
 extern int __init nfs_init_directcache(void);
 extern void nfs_destroy_directcache(void);
+extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
 
 /* nfs2xdr.c */
 extern int nfs_stat_to_errno(enum nfs_stat);