ext4: fix bogus warning in ext4_update_dx_flag()

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@kernel.org>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index de47525972a1ce3743d46d6c61ff2a2d2339fde9..abffa2488ae91d28c5bade3e6ca8e1e60b940523 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2398,7 +2398,8 @@ int ext4_insert_dentry(struct inode *dir,
                       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);