From: Eric Sandeen Date: Sat, 5 Jul 2014 23:18:22 +0000 (-0400) Subject: ext4: disable synchronous transaction batching if max_batch_time==0 X-Git-Tag: firefly_0821_release~176^2~3619^2~3 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5dd214248f94d430d70e9230bda72f2654ac88a8;p=firefly-linux-kernel-4.4.55.git ext4: disable synchronous transaction batching if max_batch_time==0 The mount manpage says of the max_batch_time option, This optimization can be turned off entirely by setting max_batch_time to 0. But the code doesn't do that. So fix the code to do that. Signed-off-by: Eric Sandeen Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org --- diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 342394772b6c..6297c07c937f 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1525,8 +1525,6 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, arg = JBD2_DEFAULT_MAX_COMMIT_AGE; sbi->s_commit_interval = HZ * arg; } else if (token == Opt_max_batch_time) { - if (arg == 0) - arg = EXT4_DEF_MAX_BATCH_TIME; sbi->s_max_batch_time = arg; } else if (token == Opt_min_batch_time) { sbi->s_min_batch_time = arg; diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 38cfcf5f6fce..6f0f590cc5a3 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1588,9 +1588,12 @@ int jbd2_journal_stop(handle_t *handle) * to perform a synchronous write. We do this to detect the * case where a single process is doing a stream of sync * writes. No point in waiting for joiners in that case. + * + * Setting max_batch_time to 0 disables this completely. */ pid = current->pid; - if (handle->h_sync && journal->j_last_sync_writer != pid) { + if (handle->h_sync && journal->j_last_sync_writer != pid && + journal->j_max_batch_time) { u64 commit_time, trans_time; journal->j_last_sync_writer = pid;