linux-ext4 - [PATCH v2 7/8] libfs: Don't support setting casefold operations during lookup

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Date: Fri, 15 Dec 2023 16:16:07 -0500
From: Gabriel Krisman Bertazi <krisman@...e.de>
To: viro@...iv.linux.org.uk,
	ebiggers@...nel.org,
	jaegeuk@...nel.org,
	tytso@....edu
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Gabriel Krisman Bertazi <krisman@...e.de>
Subject: [PATCH v2 7/8] libfs: Don't support setting casefold operations during lookup

No filesystems depend on it anymore, and it is generally a bad idea.
Since all dentries should have the same set of dentry operations in
case-insensitive filesystems, it should be configured through ->s_d_op.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...e.de>
---
 fs/libfs.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/fs/libfs.c b/fs/libfs.c
index b8ecada3a5b2..41c02c003265 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1784,27 +1784,12 @@ static const struct dentry_operations generic_encrypted_dentry_ops = {
  * generic_set_encrypted_ci_d_ops - helper for setting d_ops for given dentry
  * @dentry:	dentry to set ops on
  *
- * Casefolded directories need d_hash and d_compare set, so that the dentries
- * contained in them are handled case-insensitively.  Note that these operations
- * are needed on the parent directory rather than on the dentries in it, and
- * while the casefolding flag can be toggled on and off on an empty directory,
- * dentry_operations can't be changed later.  As a result, if the filesystem has
- * casefolding support enabled at all, we have to give all dentries the
- * casefolding operations even if their inode doesn't have the casefolding flag
- * currently (and thus the casefolding ops would be no-ops for now).
- *
  * Encryption works differently in that the only dentry operation it needs is
  * d_revalidate, which it only needs on dentries that have the no-key name flag.
  * The no-key flag can't be set "later", so we don't have to worry about that.
  */
 void generic_set_encrypted_ci_d_ops(struct dentry *dentry)
 {
-#if IS_ENABLED(CONFIG_UNICODE)
-	if (dentry->d_sb->s_encoding) {
-		d_set_d_op(dentry, &generic_ci_dentry_ops);
-		return;
-	}
-#endif
 #ifdef CONFIG_FS_ENCRYPTION
 	if (dentry->d_flags & DCACHE_NOKEY_NAME) {
 		d_set_d_op(dentry, &generic_encrypted_dentry_ops);
-- 
2.43.0