ext4: regenerate buddy after block freeing failed if under fc replay

JIRA: https://issues.redhat.com/browse/RHEL-26678 Tested: with xfstests

This mostly reverts commit 6bd97bf2 ("ext4: remove redundant mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on code in mb_free_blocks(), fast commit replay can end up marking as free blocks that are already marked as such. This causes corruption of the buddy bitmap so we need to regenerate it in that case.

Reported-by: Jan Kara jack@suse.cz Fixes: 6bd97bf2 ("ext4: remove redundant mb_regenerate_buddy()") Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20240104142040.2835097-4-libaokun1@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu (cherry picked from commit c9b528c35795b711331ed36dc3dbee90d5812d4e) Signed-off-by: Carlos Maiolino cmaiolino@redhat.com