linux-kernel - [PATCH RFC v2 5/8] ovl: Set case-insensitive dentry operations for ovl sb

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Message-Id: <20250805-tonyk-overlayfs-v2-5-0e54281da318@igalia.com>
Date: Tue, 05 Aug 2025 00:09:09 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Miklos Szeredi <miklos@...redi.hu>, Amir Goldstein <amir73il@...il.com>, 
 Theodore Tso <tytso@....edu>, Gabriel Krisman Bertazi <krisman@...nel.org>
Cc: linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-fsdevel@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 kernel-dev@...lia.com, 
 André Almeida <andrealmeid@...lia.com>
Subject: [PATCH RFC v2 5/8] ovl: Set case-insensitive dentry operations for
 ovl sb

For filesystems with encoding (i.e. with case-insensitive support), set
the dentry operations for the super block with generic_set_sb_d_ops().
Also, use the upper layer encoding as the ovl super block encoding.

Signed-off-by: André Almeida <andrealmeid@...lia.com>
---
 fs/overlayfs/super.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index cfe8010616414a5ec0421b9ac5947596bfd0a5bd..5d55a287a8c0f69aeaf2ada862c59bd7eb7b10f2 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1423,6 +1423,16 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
 
 		sb->s_stack_depth = upper_sb->s_stack_depth;
 		sb->s_time_gran = upper_sb->s_time_gran;
+
+#if IS_ENABLED(CONFIG_UNICODE)
+		if (sb_has_encoding(upper_sb)) {
+			sb->s_encoding = upper_sb->s_encoding;
+			sb->s_encoding_flags = upper_sb->s_encoding_flags;
+		}
+
+		generic_set_sb_d_ops(sb);
+#endif
+
 	}
 	oe = ovl_get_lowerstack(sb, ctx, ofs, layers);
 	err = PTR_ERR(oe);

-- 
2.50.1