cifs: turn the pages list in cifs_readdata into an array

We'll need an array to put into a smb_rqst, so convert this into an array
instead of (ab)using the lru list_head.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 737289b..b70863e 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -977,12 +977,13 @@
 	unsigned int			bytes;
 	pid_t				pid;
 	int				result;
-	struct list_head		pages;
 	struct work_struct		work;
 	int (*marshal_iov) (struct cifs_readdata *rdata,
 			    unsigned int remaining);
 	unsigned int			nr_iov;
 	struct kvec			*iov;
+	unsigned int			nr_pages;
+	struct page			*pages[];
 };
 
 struct cifs_writedata;