NFS: define a function to update nfsi->cache_change_attribute

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

fs/nfs/dir.c

@@ -638,6 +638,21 @@ static int nfs_fsync_dir(struct file *filp, struct dentry *dentry, int datasync)
 	return 0;
 }
 
+/**
+ * nfs_force_lookup_revalidate - Mark the directory as having changed
+ * @dir - pointer to directory inode
+ *
+ * This forces the revalidation code in nfs_lookup_revalidate() to do a
+ * full lookup on all child dentries of 'dir' whenever a change occurs
+ * on the server that might have invalidated our dcache.
+ *
+ * The caller should be holding dir->i_lock
+ */
+void nfs_force_lookup_revalidate(struct inode *dir)
+{
+	NFS_I(dir)->cache_change_attribute = jiffies;
+}
+
 /*
  * A check for whether or not the parent directory has changed.
  * In the case it has, we assume that the dentries are untrustworthy

fs/nfs/inode.c

@@ -1029,7 +1029,8 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 			dprintk("NFS: mtime change on server for file %s/%ld\n",
 					inode->i_sb->s_id, inode->i_ino);
 			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
-			nfsi->cache_change_attribute = now;
+			if (S_ISDIR(inode->i_mode))
+				nfs_force_lookup_revalidate(inode);
 		}
 		/* If ctime has changed we should definitely clear access+acl caches */
 		if (!timespec_equal(&inode->i_ctime, &fattr->ctime))
@@ -1038,7 +1039,8 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 		dprintk("NFS: change_attr change on server for file %s/%ld\n",
 				inode->i_sb->s_id, inode->i_ino);
 		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
-		nfsi->cache_change_attribute = now;
+		if (S_ISDIR(inode->i_mode))
+			nfs_force_lookup_revalidate(inode);
 	}
 
 	/* Check if our cached file size is stale */

fs/nfs/nfs4proc.c

@@ -210,7 +210,7 @@ static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 	spin_lock(&dir->i_lock);
 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 	if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
-		nfsi->cache_change_attribute = jiffies;
+		nfs_force_lookup_revalidate(dir);
 	nfsi->change_attr = cinfo->after;
 	spin_unlock(&dir->i_lock);
 }

include/linux/nfs_fs.h

@@ -366,6 +366,7 @@ extern const struct inode_operations nfs3_dir_inode_operations;
 extern const struct file_operations nfs_dir_operations;
 extern struct dentry_operations nfs_dentry_operations;
 
+extern void nfs_force_lookup_revalidate(struct inode *dir);
 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 extern void nfs_access_zap_cache(struct inode *inode);