From: Baokun Li libaokun1@huawei.com

commit a408f33e895e455f16cf964cb5cd4979b658db7b upstream.

When online resizing is performed twice consecutively, the error message "Superblock checksum does not match superblock" is displayed for the second time. Here's the reproducer:

mkfs.ext4 -F /dev/sdb 100M mount /dev/sdb /tmp/test resize2fs /dev/sdb 5G resize2fs /dev/sdb 6G

To solve this issue, we moved the update of the checksum after the es->s_overhead_clusters is updated.

Fixes: 026d0d27c488 ("ext4: reduce computation of overhead during resize") Fixes: de394a86658f ("ext4: update s_overhead_clusters in the superblock during an on-line resize") Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Darrick J. Wong djwong@kernel.org Reviewed-by: Jan Kara jack@suse.cz Cc: stable@kernel.org Link: https://lore.kernel.org/r/20221117040341.1380702-2-libaokun1@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Oleksandr Tymoshenko ovt@google.com --- fs/ext4/resize.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 405c68085055..589ed99856f3 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1445,8 +1445,6 @@ static void ext4_update_super(struct super_block *sb, * active. */ ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + reserved_blocks); - ext4_superblock_csum_set(sb); - unlock_buffer(sbi->s_sbh);

/* Update the free space counts */ percpu_counter_add(&sbi->s_freeclusters_counter, @@ -1474,6 +1472,8 @@ static void ext4_update_super(struct super_block *sb, ext4_calculate_overhead(sb); es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead);

+ ext4_superblock_csum_set(sb); + unlock_buffer(sbi->s_sbh); if (test_opt(sb, DEBUG)) printk(KERN_DEBUG "EXT4-fs: added group %u:" "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,