Commit cac7c9fc authored Jan 04, 2024 by Baokun Li Committed by Greg Kroah-Hartman Sep 04, 2024

ext4: do not trim the group with corrupted block bitmap



[ Upstream commit 172202152a125955367393956acf5f4ffd092e0d ]

Otherwise operating on an incorrupted block bitmap can lead to all sorts
of unknown problems.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240104142040.2835097-3-libaokun1@huawei.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 479a0cff

fs/ext4/mballoc.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -5219,6 +5219,9 @@ static int ext4_try_to_trim_range(struct super_block *sb,
		bool set_trimmed = false;
		void *bitmap;

		if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)))
		return 0;

		last = ext4_last_grp_cluster(sb, e4b->bd_group);
		bitmap = e4b->bd_bitmap;
		if (start == 0 && max >= last)