ext4: Fix symlink file size not match to file content

hulk inclusion
category: bugfix
bugzilla: 186450, https://gitee.com/openeuler/kernel/issues/I4YSJ7


CVE: NA

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We got issue as follows:
[root@yebin home]# fsck.ext4  -fn  ram0yb
e2fsck 1.45.6 (20-Mar-2020)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Symlink /p3/d14/d1a/l3d (inode #3494) is invalid.
Clear? no
Entry 'l3d' in /p3/d14/d1a (3383) has an incorrect filetype (was 7, should be 0).
Fix? no

As symlink file size not match to file content. If symlink data block writback
failed, will call ext4_finish_bio to end io. In this path don't mark buffer
error. When umount do checkpoint can't detect buffer error, then will cleanup
jounral. Actually, correct data maybe in journal area.
To solve this issue, mark buffer error when detect bio error in ext4_finish_bio.

Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>