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[ Upstream commit91b8ca8b26] Currently we clear BH_New bit in case of error and also in the standard ext4_write_end() handler (in block_commit_write()). However ext4_journalled_write_end() misses this clearing and thus we are leaving stale BH_New bits behind. Generally ext4_block_write_begin() clears these bits before any harm can be done but in case blocksize < pagesize and we hit some error when processing a page with these stale bits, we'll try to zero buffers with these stale BH_New bits and jbd2 will complain (as buffers were not prepared for writing in this transaction). Fix the problem by clearing BH_New bits in ext4_journalled_write_end() and WARN if ext4_block_write_begin() sees stale BH_New bits. Reported-by: Baolin Liu <liubaolin12138@163.com> Reported-by: Zhi Long <longzhi@sangfor.com.cn> Fixes:3910b513fc("ext4: persist the new uptodate buffers in ext4_journalled_zero_new_buffers") Signed-off-by: Jan Kara <jack@suse.cz> Link: https://patch.msgid.link/20250709084831.23876-2-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Sasha Levin <sashal@kernel.org>