linux-kernel - [PATCH RFC 4/7] fs/exfat: support `DISABLE_FS_CSUM

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Date:   Fri, 14 Oct 2022 08:48:34 +0000
From:   Hrutvik Kanabar <hrkanabar@...il.com>
To:     Hrutvik Kanabar <hrutvik@...gle.com>
Cc:     Marco Elver <elver@...gle.com>,
        Aleksandr Nogikh <nogikh@...gle.com>,
        kasan-dev@...glegroups.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        "Darrick J . Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Anton Altaparmakov <anton@...era.com>,
        linux-ntfs-dev@...ts.sourceforge.net
Subject: [PATCH RFC 4/7] fs/exfat: support `DISABLE_FS_CSUM_VERIFICATION` config option

From: Hrutvik Kanabar <hrutvik@...gle.com>

When `DISABLE_FS_CSUM_VERIFICATION` is enabled, bypass checksum
verification.

Signed-off-by: Hrutvik Kanabar <hrutvik@...gle.com>
---
 fs/exfat/nls.c   | 3 ++-
 fs/exfat/super.c | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c
index 705710f93e2d..f0f92eaf6ccc 100644
--- a/fs/exfat/nls.c
+++ b/fs/exfat/nls.c
@@ -696,7 +696,8 @@ static int exfat_load_upcase_table(struct super_block *sb,
 		brelse(bh);
 	}
 
-	if (index >= 0xFFFF && utbl_checksum == chksum)
+	if (IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION) ||
+	    (index >= 0xFFFF && utbl_checksum == chksum))
 		return 0;
 
 	exfat_err(sb, "failed to load upcase table (idx : 0x%08x, chksum : 0x%08x, utbl_chksum : 0x%08x)",
diff --git a/fs/exfat/super.c b/fs/exfat/super.c
index 35f0305cd493..7418858792b3 100644
--- a/fs/exfat/super.c
+++ b/fs/exfat/super.c
@@ -564,6 +564,9 @@ static int exfat_verify_boot_region(struct super_block *sb)
 	if (!bh)
 		return -EIO;
 
+	if (IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION))
+		return 0;
+
 	for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) {
 		p_chksum = (__le32 *)&bh->b_data[i];
 		if (le32_to_cpu(*p_chksum) != chksum) {
-- 
2.38.0.413.g74048e4d9e-goog