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-rw-r--r--fs/jbd2/transaction.c43
1 files changed, 38 insertions, 5 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index c0b66a7a795b..116d8251fbff 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -138,9 +138,9 @@ static inline void update_t_max_wait(transaction_t *transaction,
}
/*
- * Wait until running transaction passes T_LOCKED state. Also starts the commit
- * if needed. The function expects running transaction to exist and releases
- * j_state_lock.
+ * Wait until running transaction passes to T_FLUSH state and new transaction
+ * can thus be started. Also starts the commit if needed. The function expects
+ * running transaction to exist and releases j_state_lock.
*/
static void wait_transaction_locked(journal_t *journal)
__releases(journal->j_state_lock)
@@ -160,6 +160,32 @@ static void wait_transaction_locked(journal_t *journal)
finish_wait(&journal->j_wait_transaction_locked, &wait);
}
+/*
+ * Wait until running transaction transitions from T_SWITCH to T_FLUSH
+ * state and new transaction can thus be started. The function releases
+ * j_state_lock.
+ */
+static void wait_transaction_switching(journal_t *journal)
+ __releases(journal->j_state_lock)
+{
+ DEFINE_WAIT(wait);
+
+ if (WARN_ON(!journal->j_running_transaction ||
+ journal->j_running_transaction->t_state != T_SWITCH))
+ return;
+ prepare_to_wait(&journal->j_wait_transaction_locked, &wait,
+ TASK_UNINTERRUPTIBLE);
+ read_unlock(&journal->j_state_lock);
+ /*
+ * We don't call jbd2_might_wait_for_commit() here as there's no
+ * waiting for outstanding handles happening anymore in T_SWITCH state
+ * and handling of reserved handles actually relies on that for
+ * correctness.
+ */
+ schedule();
+ finish_wait(&journal->j_wait_transaction_locked, &wait);
+}
+
static void sub_reserved_credits(journal_t *journal, int blocks)
{
atomic_sub(blocks, &journal->j_reserved_credits);
@@ -183,7 +209,8 @@ static int add_transaction_credits(journal_t *journal, int blocks,
* If the current transaction is locked down for commit, wait
* for the lock to be released.
*/
- if (t->t_state == T_LOCKED) {
+ if (t->t_state != T_RUNNING) {
+ WARN_ON_ONCE(t->t_state >= T_FLUSH);
wait_transaction_locked(journal);
return 1;
}
@@ -360,8 +387,14 @@ repeat:
/*
* We have handle reserved so we are allowed to join T_LOCKED
* transaction and we don't have to check for transaction size
- * and journal space.
+ * and journal space. But we still have to wait while running
+ * transaction is being switched to a committing one as it
+ * won't wait for any handles anymore.
*/
+ if (transaction->t_state == T_SWITCH) {
+ wait_transaction_switching(journal);
+ goto repeat;
+ }
sub_reserved_credits(journal, blocks);
handle->h_reserved = 0;
}