linux-ext4 - [PATCH v4 05/10] ext4: Simplify hash check on ext4

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Date:   Wed, 11 May 2022 15:31:41 -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 05/10] ext4: Simplify hash check on ext4_match

The existence of fname->cf_name.name requires s_encoding & IS_CASEFOLDED,
therefore this can be simplified.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 fs/ext4/namei.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5296ced2e43e..cebbcabf0ff0 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1438,25 +1438,19 @@ static bool ext4_match(struct inode *parent,
 #endif
 
 #if IS_ENABLED(CONFIG_UNICODE)
-	if (parent->i_sb->s_encoding && IS_CASEFOLDED(parent) &&
-	    (!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) {
+	if (IS_ENCRYPTED(parent) && fname->cf_name.name) {
+		if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
+		    fname->hinfo.minor_hash != EXT4_DIRENT_MINOR_HASH(de))
+			return false;
+	}
+
+	if (parent->i_sb->s_encoding && IS_CASEFOLDED(parent)) {
 		struct unicode_name u = {
 			.folded_name = &fname->cf_name,
 			.usr_name = fname->usr_fname
 		};
 		int ret;
 
-		if (fname->cf_name.name) {
-			if (IS_ENCRYPTED(parent)) {
-				if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
-					fname->hinfo.minor_hash !=
-						EXT4_DIRENT_MINOR_HASH(de)) {
-
-					return false;
-				}
-			}
-		}
-
 		ret = ext4_match_ci(parent, &u, de->name, de->name_len);
 		if (ret < 0) {
 			/*
-- 
2.36.1