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Subject[PATCH v2 2/8] ext4: do not trim the group with corrupted block bitmap
Date
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>
---
fs/ext4/mballoc.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index d72b5e3c92ec..a95fa6e2b0f9 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -6757,6 +6757,9 @@ __releases(ext4_group_lock_ptr(sb, e4b->bd_group))
bool set_trimmed = false;
void *bitmap;

+ if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)))
+ return 0;
+
bitmap = e4b->bd_bitmap;
if (start == 0 && max >= ext4_last_grp_cluster(sb, e4b->bd_group))
set_trimmed = true;
--
2.31.1

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