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ext4_journal: improve jbd_journal_alloc_block performance

Purge only one journal transaction if we are run out of journal
device space.

--- a/src/ext4_journal.c

+++ b/src/ext4_journal.c

@@ -1459,10 +1459,12 @@

 	trans->alloc_blocks++;

 	wrap(&journal->jbd_fs->sb, journal->last);

-	/* If there is no space left, flush all journalled

-	 * blocks to disk first.*/

-	if (journal->last == journal->start)

-		jbd_journal_purge_cp_trans(journal, true, false);

+	/* If there is no space left, flush just one journalled

+	 * transaction.*/

+	if (journal->last == journal->start) {

+		jbd_journal_purge_cp_trans(journal, true, true);

+		ext4_assert(journal->last != journal->start);

+	}

 	return start_block;

 }