NFSv4: Express delegation limit in units of pages

Since we're tracking modifications to the page cache on a per-page
basis, it makes sense to express the limit to how much we may cache
in units of pages.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index e3c20a3..554178a 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -18,7 +18,7 @@
 	struct inode *inode;
 	nfs4_stateid stateid;
 	fmode_t type;
-	loff_t maxsize;
+	unsigned long pagemod_limit;
 	__u64 change_attr;
 	unsigned long flags;
 	spinlock_t lock;