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-rw-r--r--fs/jbd/transaction.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 429f4b263cf..ca917973c2c 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -1308,6 +1308,7 @@ int journal_stop(handle_t *handle)
transaction_t *transaction = handle->h_transaction;
journal_t *journal = transaction->t_journal;
int old_handle_count, err;
+ pid_t pid;
J_ASSERT(transaction->t_updates > 0);
J_ASSERT(journal_current_handle() == handle);
@@ -1333,8 +1334,15 @@ int journal_stop(handle_t *handle)
* It doesn't cost much - we're about to run a commit and sleep
* on IO anyway. Speeds up many-threaded, many-dir operations
* by 30x or more...
+ *
+ * But don't do this if this process was the most recent one 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.
*/
- if (handle->h_sync) {
+ pid = current->pid;
+ if (handle->h_sync && journal->j_last_sync_writer != pid) {
+ journal->j_last_sync_writer = pid;
do {
old_handle_count = transaction->t_handle_count;
schedule_timeout_uninterruptible(1);