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Date:   Wed, 11 May 2022 15:31:44 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org
Cc:     linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        ebiggers@...nel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH v4 08/10] f2fs: Reuse generic_ci_match for ci comparisons

Now that ci_match is part of libfs, make f2fs reuse it instead of having
a different implementation.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>

---
Changes since v3:
  - fix unused variable iff !CONFIG_UNICODE (lkp)
---
 fs/f2fs/dir.c | 63 +++++++--------------------------------------------
 1 file changed, 8 insertions(+), 55 deletions(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index c2a02003c5b9..e284d6f5d0bf 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -222,58 +222,6 @@ static struct f2fs_dir_entry *find_in_block(struct inode *dir,
 	return f2fs_find_target_dentry(&d, fname, max_slots);
 }
 
-#if IS_ENABLED(CONFIG_UNICODE)
-/*
- * Test whether a case-insensitive directory entry matches the filename
- * being searched for.
- *
- * Returns 1 for a match, 0 for no match, and -errno on an error.
- */
-static int f2fs_match_ci_name(const struct inode *dir, const struct qstr *name,
-			       const u8 *de_name, u32 de_name_len)
-{
-	const struct super_block *sb = dir->i_sb;
-	const struct unicode_map *um = sb->s_encoding;
-	struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len);
-	struct qstr entry = QSTR_INIT(de_name, de_name_len);
-	int res;
-
-	if (IS_ENCRYPTED(dir)) {
-		const struct fscrypt_str encrypted_name =
-			FSTR_INIT((u8 *)de_name, de_name_len);
-
-		if (WARN_ON_ONCE(!fscrypt_has_encryption_key(dir)))
-			return -EINVAL;
-
-		decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL);
-		if (!decrypted_name.name)
-			return -ENOMEM;
-		res = fscrypt_fname_disk_to_usr(dir, 0, 0, &encrypted_name,
-						&decrypted_name);
-		if (res < 0)
-			goto out;
-		entry.name = decrypted_name.name;
-		entry.len = decrypted_name.len;
-	}
-
-	res = utf8_strncasecmp_folded(um, name, &entry);
-	/*
-	 * In strict mode, ignore invalid names.  In non-strict mode,
-	 * fall back to treating them as opaque byte sequences.
-	 */
-	if (res < 0 && !sb_has_strict_encoding(sb)) {
-		res = name->len == entry.len &&
-				memcmp(name->name, entry.name, name->len) == 0;
-	} else {
-		/* utf8_strncasecmp_folded returns 0 on match */
-		res = (res == 0);
-	}
-out:
-	kfree(decrypted_name.name);
-	return res;
-}
-#endif /* CONFIG_UNICODE */
-
 static inline int f2fs_match_name(const struct inode *dir,
 				   const struct f2fs_filename *fname,
 				   const u8 *de_name, u32 de_name_len)
@@ -281,9 +229,14 @@ static inline int f2fs_match_name(const struct inode *dir,
 	struct fscrypt_name f;
 
 #if IS_ENABLED(CONFIG_UNICODE)
-	if (fname->cf_name.name)
-		return f2fs_match_ci_name(dir, &fname->cf_name,
-					  de_name, de_name_len);
+	if (fname->cf_name.name) {
+		struct unicode_name u = {
+			.folded_name = &fname->cf_name,
+			.usr_name = fname->usr_fname,
+		};
+
+		return generic_ci_match(dir, &u, (u8 *) de_name, de_name_len);
+	}
 #endif
 	f.usr_fname = fname->usr_fname;
 	f.disk_name = fname->disk_name;
-- 
2.36.1

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