From: André Almeida <andrealmeid@igalia.com>
Date: Thu, 14 Aug 2025 17:22:17 +0000 (-0300)
Subject: ovl: Set case-insensitive dentry operations for ovl sb
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=8a78f189756ac3bc8c1c326994ad7261885227bb;p=users%2Fhch%2Fmisc.git

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 as ovl_dentry_ci_operations.

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 548ea9b1a48d..4ba2baff1b72 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -161,6 +161,16 @@ static const struct dentry_operations ovl_dentry_operations = {
 	.d_weak_revalidate = ovl_dentry_weak_revalidate,
 };
 
+#if IS_ENABLED(CONFIG_UNICODE)
+static const struct dentry_operations ovl_dentry_ci_operations = {
+	.d_real = ovl_d_real,
+	.d_revalidate = ovl_dentry_revalidate,
+	.d_weak_revalidate = ovl_dentry_weak_revalidate,
+	.d_hash = generic_ci_d_hash,
+	.d_compare = generic_ci_d_compare,
+};
+#endif
+
 static struct kmem_cache *ovl_inode_cachep;
 
 static struct inode *ovl_alloc_inode(struct super_block *sb)
@@ -1345,6 +1355,19 @@ static struct dentry *ovl_get_root(struct super_block *sb,
 	return root;
 }
 
+static void ovl_set_d_op(struct super_block *sb)
+{
+#if IS_ENABLED(CONFIG_UNICODE)
+	struct ovl_fs *ofs = sb->s_fs_info;
+
+	if (ofs->casefold) {
+		set_default_d_op(sb, &ovl_dentry_ci_operations);
+		return;
+	}
+#endif
+	set_default_d_op(sb, &ovl_dentry_operations);
+}
+
 int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	struct ovl_fs *ofs = sb->s_fs_info;
@@ -1360,7 +1383,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
 	if (WARN_ON(fc->user_ns != current_user_ns()))
 		goto out_err;
 
-	set_default_d_op(sb, &ovl_dentry_operations);
+	ovl_set_d_op(sb);
 
 	err = -ENOMEM;
 	if (!ofs->creator_cred)