ext4: protect journal inode's blocks using block_validity

mainline inclusion
from mainline-5.2-rc1
commit 345c0dbf
category: bugfix
bugzilla: 14858
CVE: NA
---------------------------

Add the blocks which belong to the journal inode to block_validity's
system zone so attempts to deallocate or overwrite the journal due a
corrupted file system where the journal blocks are also claimed by
another inode.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202879


Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org

Signed-off-by: yangerkun <yangerkun@huawei.com>
Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>