linux-kernel - [PATCH RFC 7/7] fs/f2fs: support `DISABLE_FS_CSUM

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Date:   Fri, 14 Oct 2022 08:48:37 +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 7/7] fs/f2fs: 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/f2fs/checkpoint.c | 3 ++-
 fs/f2fs/compress.c   | 3 ++-
 fs/f2fs/f2fs.h       | 2 ++
 fs/f2fs/inode.c      | 3 +++
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 0c82dae082aa..cc5043fbffcb 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -864,7 +864,8 @@ static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
 	}
 
 	crc = f2fs_checkpoint_chksum(sbi, *cp_block);
-	if (crc != cur_cp_crc(*cp_block)) {
+	if (!IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION) &&
+	    crc != cur_cp_crc(*cp_block)) {
 		f2fs_put_page(*cp_page, 1);
 		f2fs_warn(sbi, "invalid crc value");
 		return -EINVAL;
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index d315c2de136f..d0bce92dbf38 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -772,7 +772,8 @@ void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
 		u32 provided = le32_to_cpu(dic->cbuf->chksum);
 		u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
 
-		if (provided != calculated) {
+		if (!IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION) &&
+		    provided != calculated) {
 			if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
 				set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
 				printk_ratelimited(
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e6355a5683b7..b27f1ec9b49f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1976,6 +1976,8 @@ static inline u32 f2fs_crc32(struct f2fs_sb_info *sbi, const void *address,
 static inline bool f2fs_crc_valid(struct f2fs_sb_info *sbi, __u32 blk_crc,
 				  void *buf, size_t buf_size)
 {
+	if (IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION))
+		return true;
 	return f2fs_crc32(sbi, buf, buf_size) == blk_crc;
 }
 
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 9f0d3864d9f1..239bb08e45b1 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -181,6 +181,9 @@ bool f2fs_inode_chksum_verify(struct f2fs_sb_info *sbi, struct page *page)
 #endif
 		return true;
 
+	if (IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION))
+		return true;
+
 	ri = &F2FS_NODE(page)->i;
 	provided = le32_to_cpu(ri->i_inode_checksum);
 	calculated = f2fs_inode_chksum(sbi, page);
-- 
2.38.0.413.g74048e4d9e-goog