linux-kernel - [PATCH RFC 5/7] fs/xfs: support `DISABLE_FS_CSUM

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Date:   Fri, 14 Oct 2022 08:48:35 +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 5/7] fs/xfs: support `DISABLE_FS_CSUM_VERIFICATION` config option

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

When `DISABLE_FS_CSUM_VERIFICATION` is enabled, return truthy value for
`xfs_verify_cksum`, which is the key function implementing checksum
verification for XFS.

Signed-off-by: Hrutvik Kanabar <hrutvik@...gle.com>
---
 fs/xfs/libxfs/xfs_cksum.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_cksum.h b/fs/xfs/libxfs/xfs_cksum.h
index 999a290cfd72..ba55b1afa382 100644
--- a/fs/xfs/libxfs/xfs_cksum.h
+++ b/fs/xfs/libxfs/xfs_cksum.h
@@ -76,7 +76,10 @@ xfs_verify_cksum(char *buffer, size_t length, unsigned long cksum_offset)
 {
 	uint32_t crc = xfs_start_cksum_safe(buffer, length, cksum_offset);
 
-	return *(__le32 *)(buffer + cksum_offset) == xfs_end_cksum(crc);
+	if (IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION))
+		return 1;
+	else
+		return *(__le32 *)(buffer + cksum_offset) == xfs_end_cksum(crc);
 }
 
 #endif /* _XFS_CKSUM_H */
-- 
2.38.0.413.g74048e4d9e-goog