Revert "ext4: Avoid writeback path when fs is shut down"

This reverts commit f50891a.

The patch didn't work to supress the sporadic

"ext4_writepages: jbd2_start: XXX pages, ino YYY; err -5" warnings we
sometimes get when mxqd tries to unmount the temporary job filesystems
using

- fcntl EXT4_IOC_SHUTDOWN with EXT4_GOING_FLAGS_NOLOGFLUSH
- dmestup reload $dmname --table "0 $sectors zero"
- dmsetup resume $dmname --noflush
- umount $mountpoint
- dmsetup remove --deferred $dmname
- rmdir $mountpoint

to avoid writeback.

fs/ext4/super.c

@@ -523,10 +523,6 @@ static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
 static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
 {
 	int ret;
-	journal_t *journal = EXT4_SB(jinode->i_vfs_inode->i_sb)->s_journal;
-
-	if (!journal || is_journal_aborted(journal))
-		return 0;
 
 	if (ext4_should_journal_data(jinode->i_vfs_inode))
 		ret = ext4_journalled_submit_inode_data_buffers(jinode);
@@ -539,10 +535,6 @@ static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
 static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
 {
 	int ret = 0;
-	journal_t *journal = EXT4_SB(jinode->i_vfs_inode->i_sb)->s_journal;
-
-	if (!journal || is_journal_aborted(journal))
-		return 0;
 
 	if (!ext4_should_journal_data(jinode->i_vfs_inode))
 		ret = jbd2_journal_finish_inode_data_buffers(jinode);