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ext4: disable synchronous transaction batching if max_batch_time==0

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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 <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Cc: [email protected]
This commit is contained in:
Eric Sandeen 2014-07-05 19:18:22 -04:00 • committed by Theodore Ts'o
commit 5dd214248f
2 changed files with 4 additions and 3 deletions
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5
fs/jbd2/transaction.c
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@ -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;