linux-kernel - [PATCH 5.9 205/252] ext4: fix bogus warning in ext4_update_dx

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Message-Id: <20201123121845.459540549@linuxfoundation.org>
Date:   Mon, 23 Nov 2020 13:22:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Biggers <ebiggers@...nel.org>,
        Eric Biggers <ebiggers@...gle.com>, Jan Kara <jack@...e.cz>,
        Theodore Tso <tytso@....edu>, stable@...nel.org
Subject: [PATCH 5.9 205/252] ext4: fix bogus warning in ext4_update_dx_flag()

From: Jan Kara <jack@...e.cz>

commit f902b216501094495ff75834035656e8119c537f upstream.

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.

Link: https://lore.kernel.org/r/20201118153032.17281-1-jack@suse.cz
Fixes: 48a34311953d ("ext4: fix checksum errors with indexed dirs")
Reported-by: Eric Biggers <ebiggers@...nel.org>
Reviewed-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...nel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/ext4.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2622,7 +2622,8 @@ void ext4_insert_dentry(struct inode *in
 			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);