linux-kernel - [RFC PATCH V6 2/7] ovl: mark overlayfs inode dirty when it has upper

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Date:   Mon, 22 Nov 2021 11:00:33 +0800
From:   Chengguang Xu <cgxu519@...ernel.net>
To:     miklos@...redi.hu, jack@...e.cz, amir73il@...il.com
Cc:     linux-unionfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chengguang Xu <charliecgxu@...cent.com>
Subject: [RFC PATCH V6 2/7] ovl: mark overlayfs inode dirty when it has upper

From: Chengguang Xu <charliecgxu@...cent.com>

We simply mark overlayfs inode dirty when it has upper,
it's much simpler than mark dirtiness on modification.

Signed-off-by: Chengguang Xu <charliecgxu@...cent.com>
---
 fs/overlayfs/inode.c | 4 +++-
 fs/overlayfs/util.c  | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 1f36158c7dbe..027ffc0a2539 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -778,8 +778,10 @@ void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
 {
 	struct inode *realinode;
 
-	if (oip->upperdentry)
+	if (oip->upperdentry) {
 		OVL_I(inode)->__upperdentry = oip->upperdentry;
+		mark_inode_dirty(inode);
+	}
 	if (oip->lowerpath && oip->lowerpath->dentry)
 		OVL_I(inode)->lower = igrab(d_inode(oip->lowerpath->dentry));
 	if (oip->lowerdata)
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index f48284a2a896..a1922af32a13 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -421,6 +421,7 @@ void ovl_inode_update(struct inode *inode, struct dentry *upperdentry)
 		inode->i_private = upperinode;
 		__insert_inode_hash(inode, (unsigned long) upperinode);
 	}
+	mark_inode_dirty(inode);
 }
 
 static void ovl_dir_version_inc(struct dentry *dentry, bool impurity)
-- 
2.27.0