From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f65.google.com ([74.125.82.65]:53667 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936637AbeE2Oqk (ORCPT ); Tue, 29 May 2018 10:46:40 -0400 Received: by mail-wm0-f65.google.com with SMTP id a67-v6so41218189wmf.3 for ; Tue, 29 May 2018 07:46:40 -0700 (PDT) From: Miklos Szeredi To: linux-unionfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 20/28] ovl: Add an inode flag OVL_CONST_INO Date: Tue, 29 May 2018 16:46:04 +0200 Message-Id: <20180529144612.16675-21-mszeredi@redhat.com> In-Reply-To: <20180529144612.16675-1-mszeredi@redhat.com> References: <20180529144612.16675-1-mszeredi@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Vivek Goyal Add an ovl_inode flag OVL_CONST_INO. This flag signifies if inode number will remain constant over copy up or not. This flag does not get updated over copy up and remains unmodifed after setting once. Next patch in the series will make use of this flag. It will basically figure out if dentry is of type ORIGIN or not. And this can be derived by this flag. ORIGIN = (upperdentry && ovl_test_flag(OVL_CONST_INO, inode)). Suggested-by: Amir Goldstein Signed-off-by: Vivek Goyal Reviewed-by: Amir Goldstein Signed-off-by: Miklos Szeredi --- fs/overlayfs/inode.c | 3 +++ fs/overlayfs/overlayfs.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index d4e643e9098b..ac1d2a581a6e 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -883,6 +883,9 @@ struct inode *ovl_get_inode(struct super_block *sb, OVL_I(inode)->redirect = oip->redirect; + if (bylower) + ovl_set_flag(OVL_CONST_INO, inode); + /* Check for non-merge dir that may have whiteouts */ if (is_dir) { if (((upperdentry && lowerdentry) || oip->numlower > 1) || diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index dcd600201ec8..bde352e414e7 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -38,6 +38,8 @@ enum ovl_inode_flag { OVL_WHITEOUTS, OVL_INDEX, OVL_UPPERDATA, + /* Inode number will remain constant over copy up. */ + OVL_CONST_INO, }; enum ovl_entry_flag { -- 2.14.3