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Date:   Wed, 18 Nov 2020 16:30:32 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, Eric Biggers <ebiggers@...nel.org>,
        Jan Kara <jack@...e.cz>
Subject: [PATCH] ext4: Fix bogus warning in ext4_update_dx_flag()

The idea of the warning in ext4_update_dx_flag() is that we should warn
when we are clearing EXT4_INODE_INDEX on a filesystem with metadata
checksums enabled since after clearing the flag, checksums for internal
htree nodes will become invalid. So there's no need to warn (or actually
do anything) when EXT4_INODE_INDEX is not set.

Reported-by: Eric Biggers <ebiggers@...nel.org>
Fixes: 48a34311953d ("ext4: fix checksum errors with indexed dirs")
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/ext4.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f976b5089476..5ee04ee27769 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2685,7 +2685,8 @@ void ext4_insert_dentry(struct inode *inode,
 			struct ext4_filename *fname);
 static inline void ext4_update_dx_flag(struct inode *inode)
 {
-	if (!ext4_has_feature_dir_index(inode->i_sb)) {
+	if (!ext4_has_feature_dir_index(inode->i_sb) &&
+	    ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
 		/* ext4_iget() should have caught this... */
 		WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
 		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
-- 
2.16.4

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