pNFS: Don't mark the inode as revalidated if a LAYOUTCOMMIT is outstanding

We know that the attributes will need updating if there is still a
LAYOUTCOMMIT outstanding.
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/inode.c

@@ -1664,7 +1664,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 	unsigned long now = jiffies;
 	unsigned long save_cache_validity;
 	bool have_writers = nfs_file_has_buffered_writers(nfsi);
-	bool cache_revalidated = true;
+	bool cache_revalidated;
 
 	dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
 			__func__, inode->i_sb->s_id, inode->i_ino,
@@ -1713,6 +1713,9 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 	/* Do atomic weak cache consistency updates */
 	invalid |= nfs_wcc_update_inode(inode, fattr);
 
+
+	cache_revalidated = !pnfs_layoutcommit_outstanding(inode);
+
 	/* More cache consistency checks */
 	if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
 		if (inode->i_version != fattr->change_attr) {

fs/nfs/pnfs.h

@@ -628,6 +628,13 @@ pnfs_sync_inode(struct inode *inode, bool datasync)
 	return 0;
 }
 
+static inline bool
+pnfs_layoutcommit_outstanding(struct inode *inode)
+{
+	return false;
+}
+
+
 static inline bool
 pnfs_roc(struct inode *ino)
 {