NFS: Allow redirtying of a completed unstable write.

Currently, if an unstable write completes, we cannot redirty the page in
order to reflect a new change in the page data until after we've sent a
COMMIT request.

This patch allows a page rewrite to proceed without the unnecessary COMMIT
step, putting it immediately back onto the dirty page list, undoing the
VM unstable write accounting, and removing the NFS_PAGE_TAG_COMMIT tag from
the NFS radix tree.

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

include/linux/nfs_page.h

@@ -27,9 +27,12 @@
 /*
  * Valid flags for a dirty buffer
  */
-#define PG_BUSY			0
-#define PG_NEED_COMMIT		1
-#define PG_NEED_RESCHED		2
+enum {
+	PG_BUSY = 0,
+	PG_CLEAN,
+	PG_NEED_COMMIT,
+	PG_NEED_RESCHED,
+};
 
 struct nfs_inode;
 struct nfs_page {