maillist inclusion
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I6MMUV
CVE: NA

Reference: https://www.spinics.net/lists/linux-ext4/msg88237.html

--------------------------------

As discussed in [1], 'sbi->s_journal_bdev != sb->s_bdev' will always
become true if sbi->s_journal_bdev exists. Filesystem block device and
journal block device are both opened with 'FMODE_EXCL' mode, so these
two devices can't be same one. Then we can remove the redundant checking
'sbi->s_journal_bdev != sb->s_bdev' if 'sbi->s_journal_bdev' exists.

[1] https://lore.kernel.org/lkml/f86584f6-3877-ff18-47a1-2efaa12d18b2@huawei.com/

Conflicts:
	fs/ext4/super.c
	[ ee7ed3aa("ext4: rename journal_dev to s_journal_dev inside
	  ext4_sb_info") is not applied. ]
Signed-off-by: NZhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: NZhang Yi <yi.zhang@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>