[PATCH v3 2/6] ext4: ext4_put_super: Remove redundant checking for 'sbi->s_journal_bdev'

Zhihao Cheng
2023-03-15T01:33:00Z

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/

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
---
fs/ext4/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 61511b7ba017..a22417d113ca 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1277,7 +1277,7 @@ static void ext4_put_super(struct super_block *sb)

sync_blockdev(sb->s_bdev);
invalidate_bdev(sb->s_bdev);
- if (sbi->s_journal_bdev && sbi->s_journal_bdev != sb->s_bdev) {
+ if (sbi->s_journal_bdev) {
sync_blockdev(sbi->s_journal_bdev);
ext4_blkdev_remove(sbi);
}
--
2.31.1