26  * Unlink a buffer from a transaction checkpoint list.
32 	transaction_t *transaction = jh->b_cp_transaction;  in __buffer_unlink()  local
36 	if (transaction->t_checkpoint_list == jh) {  in __buffer_unlink()
37 		transaction->t_checkpoint_list = jh->b_cpnext;  in __buffer_unlink()
38 		if (transaction->t_checkpoint_list == jh)  in __buffer_unlink()
39 			transaction->t_checkpoint_list = NULL;  in __buffer_unlink()
67 		 * transaction to complete.  If there is absolutely no way  in __jbd2_log_wait_for_space()
141  * Perform an actual checkpoint. We take the first transaction on the
152 	transaction_t		*transaction;  in jbd2_log_do_checkpoint()  local
170 	 * OK, we need to start writing disk blocks.  Take one transaction  in jbd2_log_do_checkpoint()
176 	transaction = journal->j_checkpoint_transactions;  in jbd2_log_do_checkpoint()
177 	if (transaction->t_chp_stats.cs_chp_time == 0)  in jbd2_log_do_checkpoint()
178 		transaction->t_chp_stats.cs_chp_time = jiffies;  in jbd2_log_do_checkpoint()
179 	this_tid = transaction->t_tid;  in jbd2_log_do_checkpoint()
182 	 * If someone cleaned up this transaction while we slept, we're  in jbd2_log_do_checkpoint()
183 	 * done (maybe it's a new transaction, but it fell at the same  in jbd2_log_do_checkpoint()
186 	if (journal->j_checkpoint_transactions != transaction ||  in jbd2_log_do_checkpoint()
187 	    transaction->t_tid != this_tid)  in jbd2_log_do_checkpoint()
190 	/* checkpoint all of the transaction's buffers */  in jbd2_log_do_checkpoint()
191 	while (transaction->t_checkpoint_list) {  in jbd2_log_do_checkpoint()
192 		jh = transaction->t_checkpoint_list;  in jbd2_log_do_checkpoint()
199 			transaction->t_chp_stats.cs_forced_to_close++;  in jbd2_log_do_checkpoint()
233 			 * re-adding into a new transaction, need to check  in jbd2_log_do_checkpoint()
247 			 * If the transaction was released or the checkpoint  in jbd2_log_do_checkpoint()
251 			    !transaction->t_checkpoint_list)  in jbd2_log_do_checkpoint()
257 			 * raced by some other transaction shrink or buffer  in jbd2_log_do_checkpoint()
266 			transaction->t_chp_stats.cs_written++;  in jbd2_log_do_checkpoint()
267 			transaction->t_checkpoint_list = jh->b_cpnext;  in jbd2_log_do_checkpoint()
272 		    jh2bh(transaction->t_checkpoint_list) == journal->j_chkpt_bhs[0])  in jbd2_log_do_checkpoint()
304  * aware of transaction aborts.  Checkpointing involves writing to the
346  * and try to release them. If the whole transaction is released, set
406 	transaction_t *transaction, *last_transaction, *next_transaction;  in jbd2_journal_shrink_checkpoint_list()  local
421 	 * Get next shrink transaction, resume previous scan or start  in jbd2_journal_shrink_checkpoint_list()
422 	 * over again. If some others do checkpoint and drop transaction  in jbd2_journal_shrink_checkpoint_list()
427 		transaction = journal->j_shrink_transaction;  in jbd2_journal_shrink_checkpoint_list()
429 		transaction = journal->j_checkpoint_transactions;  in jbd2_journal_shrink_checkpoint_list()
432 		first_tid = transaction->t_tid;  in jbd2_journal_shrink_checkpoint_list()
434 	next_transaction = transaction;  in jbd2_journal_shrink_checkpoint_list()
437 		transaction = next_transaction;  in jbd2_journal_shrink_checkpoint_list()
438 		next_transaction = transaction->t_cpnext;  in jbd2_journal_shrink_checkpoint_list()
439 		tid = transaction->t_tid;  in jbd2_journal_shrink_checkpoint_list()
441 		freed = journal_shrink_one_cp_list(transaction->t_checkpoint_list,  in jbd2_journal_shrink_checkpoint_list()
449 	} while (transaction != last_transaction);  in jbd2_journal_shrink_checkpoint_list()
451 	if (transaction != last_transaction) {  in jbd2_journal_shrink_checkpoint_list()
481 	transaction_t *transaction, *last_transaction, *next_transaction;  in __jbd2_journal_clean_checkpoint_list()  local
485 	transaction = journal->j_checkpoint_transactions;  in __jbd2_journal_clean_checkpoint_list()
486 	if (!transaction)  in __jbd2_journal_clean_checkpoint_list()
490 	last_transaction = transaction->t_cpprev;  in __jbd2_journal_clean_checkpoint_list()
491 	next_transaction = transaction;  in __jbd2_journal_clean_checkpoint_list()
493 		transaction = next_transaction;  in __jbd2_journal_clean_checkpoint_list()
494 		next_transaction = transaction->t_cpnext;  in __jbd2_journal_clean_checkpoint_list()
495 		journal_shrink_one_cp_list(transaction->t_checkpoint_list,  in __jbd2_journal_clean_checkpoint_list()
505 		 * Stop scanning if we couldn't free the transaction. This  in __jbd2_journal_clean_checkpoint_list()
511 	} while (transaction != last_transaction);  in __jbd2_journal_clean_checkpoint_list()
541  * We cannot safely clean a transaction out of the log until all of the
542  * buffer updates committed in that transaction have safely been stored
544  * transaction need to be maintained on the transaction's checkpoint
546  * called to remove the buffer from the existing transaction's
549  * The function returns 1 if it frees the transaction, 0 otherwise.
557 	transaction_t *transaction;  in __jbd2_journal_remove_checkpoint()  local
562 	transaction = jh->b_cp_transaction;  in __jbd2_journal_remove_checkpoint()
563 	if (!transaction) {  in __jbd2_journal_remove_checkpoint()
564 		JBUFFER_TRACE(jh, "not on transaction");  in __jbd2_journal_remove_checkpoint()
567 	journal = transaction->t_journal;  in __jbd2_journal_remove_checkpoint()
569 	JBUFFER_TRACE(jh, "removing from transaction");  in __jbd2_journal_remove_checkpoint()
576 	/* Is this transaction empty? */  in __jbd2_journal_remove_checkpoint()
577 	if (transaction->t_checkpoint_list)  in __jbd2_journal_remove_checkpoint()
582 	 * buffer off a running or committing transaction's checkpoing list,  in __jbd2_journal_remove_checkpoint()
583 	 * then even if the checkpoint list is empty, the transaction obviously  in __jbd2_journal_remove_checkpoint()
589 	if (transaction->t_state != T_FINISHED)  in __jbd2_journal_remove_checkpoint()
593 	 * OK, that was the last buffer for the transaction, we can now  in __jbd2_journal_remove_checkpoint()
594 	 * safely remove this transaction from the log.  in __jbd2_journal_remove_checkpoint()
596 	stats = &transaction->t_chp_stats;  in __jbd2_journal_remove_checkpoint()
601 				    transaction->t_tid, stats);  in __jbd2_journal_remove_checkpoint()
603 	__jbd2_journal_drop_transaction(journal, transaction);  in __jbd2_journal_remove_checkpoint()
604 	jbd2_journal_free_transaction(transaction);  in __jbd2_journal_remove_checkpoint()
611  * it frees the transaction, 0 otherwise.
632 	 * buffer from this transaction.  in jbd2_journal_try_remove_checkpoint()
640  * list so that we know when it is safe to clean the transaction out of
647 			       transaction_t *transaction)  in __jbd2_journal_insert_checkpoint()  argument
653 	/* Get reference for checkpointing transaction */  in __jbd2_journal_insert_checkpoint()
655 	jh->b_cp_transaction = transaction;  in __jbd2_journal_insert_checkpoint()
657 	if (!transaction->t_checkpoint_list) {  in __jbd2_journal_insert_checkpoint()
660 		jh->b_cpnext = transaction->t_checkpoint_list;  in __jbd2_journal_insert_checkpoint()
661 		jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev;  in __jbd2_journal_insert_checkpoint()
665 	transaction->t_checkpoint_list = jh;  in __jbd2_journal_insert_checkpoint()
666 	percpu_counter_inc(&transaction->t_journal->j_checkpoint_jh_count);  in __jbd2_journal_insert_checkpoint()
670  * We've finished with this transaction structure: adios...
672  * The transaction must have no links except for the checkpoint by this
679 void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)  in __jbd2_journal_drop_transaction()  argument
684 	if (transaction->t_cpnext) {  in __jbd2_journal_drop_transaction()
685 		transaction->t_cpnext->t_cpprev = transaction->t_cpprev;  in __jbd2_journal_drop_transaction()
686 		transaction->t_cpprev->t_cpnext = transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
687 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
689 				transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
690 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
694 	J_ASSERT(transaction->t_state == T_FINISHED);  in __jbd2_journal_drop_transaction()
695 	J_ASSERT(transaction->t_buffers == NULL);  in __jbd2_journal_drop_transaction()
696 	J_ASSERT(transaction->t_forget == NULL);  in __jbd2_journal_drop_transaction()
697 	J_ASSERT(transaction->t_shadow_list == NULL);  in __jbd2_journal_drop_transaction()
698 	J_ASSERT(transaction->t_checkpoint_list == NULL);  in __jbd2_journal_drop_transaction()
699 	J_ASSERT(atomic_read(&transaction->t_updates) == 0);  in __jbd2_journal_drop_transaction()
700 	J_ASSERT(journal->j_committing_transaction != transaction);  in __jbd2_journal_drop_transaction()
701 	J_ASSERT(journal->j_running_transaction != transaction);  in __jbd2_journal_drop_transaction()
703 	trace_jbd2_drop_transaction(journal, transaction);  in __jbd2_journal_drop_transaction()
705 	jbd2_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);  in __jbd2_journal_drop_transaction()