This is a note to let you know that I've just added the patch titled
ext4: do not trim the group with corrupted block bitmap
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-do-not-trim-the-group-with-corrupted-block-bitm.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c4aed850fea42bc2e942505c0d3fdaa1362e1578
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Thu Jan 4 22:20:34 2024 +0800
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@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Link: https://lore.kernel.org/r/20240104142040.2835097-3-libaokun1@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 5dcc3cad5c7d3..75dbe40ed8f72 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -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)
