ext4: shutdown should not prevent get_write_access

commit 576d18ed upstream.

The ext4 forced shutdown flag needs to prevent new handles from being
started, but it needs to allow existing handles to complete.  So the
forced shutdown flag should not force ext4_journal_get_write_access to
fail.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/ext4/ext4_jbd2.c

@@ -166,13 +166,6 @@ int __ext4_journal_get_write_access(const char *where, unsigned int line,
 	might_sleep();
 
 	if (ext4_handle_valid(handle)) {
-		struct super_block *sb;
-
-		sb = handle->h_transaction->t_journal->j_private;
-		if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) {
-			jbd2_journal_abort_handle(handle);
-			return -EIO;
-		}
 		err = jbd2_journal_get_write_access(handle, bh);
 		if (err)
 			ext4_journal_abort_handle(where, line, __func__, bh,