26  * Unlink a buffer from a transaction checkpoint list.
32 	transaction_t *transaction = jh->b_cp_transaction;  in __buffer_unlink_first()  local
36 	if (transaction->t_checkpoint_list == jh) {  in __buffer_unlink_first()
37 		transaction->t_checkpoint_list = jh->b_cpnext;  in __buffer_unlink_first()
38 		if (transaction->t_checkpoint_list == jh)  in __buffer_unlink_first()
39 			transaction->t_checkpoint_list = NULL;  in __buffer_unlink_first()
44  * Unlink a buffer from a transaction checkpoint(io) list.
50 	transaction_t *transaction = jh->b_cp_transaction;  in __buffer_unlink()  local
53 	if (transaction->t_checkpoint_io_list == jh) {  in __buffer_unlink()
54 		transaction->t_checkpoint_io_list = jh->b_cpnext;  in __buffer_unlink()
55 		if (transaction->t_checkpoint_io_list == jh)  in __buffer_unlink()
56 			transaction->t_checkpoint_io_list = NULL;  in __buffer_unlink()
67 	transaction_t *transaction = jh->b_cp_transaction;  in __buffer_relink_io()  local
71 	if (!transaction->t_checkpoint_io_list) {  in __buffer_relink_io()
74 		jh->b_cpnext = transaction->t_checkpoint_io_list;  in __buffer_relink_io()
75 		jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev;  in __buffer_relink_io()
79 	transaction->t_checkpoint_io_list = jh;  in __buffer_relink_io()
83  * Try to release a checkpointed buffer from its transaction.
85  * whole transaction.
124 		 * transaction to complete.  If there is absolutely no way  in __jbd2_log_wait_for_space()
198  * Perform an actual checkpoint. We take the first transaction on the
209 	transaction_t		*transaction;  in jbd2_log_do_checkpoint()  local
227 	 * OK, we need to start writing disk blocks.  Take one transaction  in jbd2_log_do_checkpoint()
234 	transaction = journal->j_checkpoint_transactions;  in jbd2_log_do_checkpoint()
235 	if (transaction->t_chp_stats.cs_chp_time == 0)  in jbd2_log_do_checkpoint()
236 		transaction->t_chp_stats.cs_chp_time = jiffies;  in jbd2_log_do_checkpoint()
237 	this_tid = transaction->t_tid;  in jbd2_log_do_checkpoint()
240 	 * If someone cleaned up this transaction while we slept, we're  in jbd2_log_do_checkpoint()
241 	 * done (maybe it's a new transaction, but it fell at the same  in jbd2_log_do_checkpoint()
244 	if (journal->j_checkpoint_transactions != transaction ||  in jbd2_log_do_checkpoint()
245 	    transaction->t_tid != this_tid)  in jbd2_log_do_checkpoint()
248 	/* checkpoint all of the transaction's buffers */  in jbd2_log_do_checkpoint()
249 	while (transaction->t_checkpoint_list) {  in jbd2_log_do_checkpoint()
250 		jh = transaction->t_checkpoint_list;  in jbd2_log_do_checkpoint()
266 			transaction->t_chp_stats.cs_forced_to_close++;  in jbd2_log_do_checkpoint()
288 				/* The transaction was released; we're done */  in jbd2_log_do_checkpoint()
295 		 * lock.  We cannot afford to let the transaction  in jbd2_log_do_checkpoint()
305 		transaction->t_chp_stats.cs_written++;  in jbd2_log_do_checkpoint()
323 	 * Now we issued all of the transaction's buffers, let's deal  in jbd2_log_do_checkpoint()
327 	/* Did somebody clean up the transaction in the meanwhile? */  in jbd2_log_do_checkpoint()
328 	if (journal->j_checkpoint_transactions != transaction ||  in jbd2_log_do_checkpoint()
329 	    transaction->t_tid != this_tid)  in jbd2_log_do_checkpoint()
332 	while (transaction->t_checkpoint_io_list) {  in jbd2_log_do_checkpoint()
333 		jh = transaction->t_checkpoint_io_list;  in jbd2_log_do_checkpoint()
377  * aware of transaction aborts.  Checkpointing involves writing to the
420  * Returns 1 if we freed the transaction, 0 otherwise.
466 	transaction_t *transaction, *last_transaction, *next_transaction;  in __jbd2_journal_clean_checkpoint_list()  local
469 	transaction = journal->j_checkpoint_transactions;  in __jbd2_journal_clean_checkpoint_list()
470 	if (!transaction)  in __jbd2_journal_clean_checkpoint_list()
473 	last_transaction = transaction->t_cpprev;  in __jbd2_journal_clean_checkpoint_list()
474 	next_transaction = transaction;  in __jbd2_journal_clean_checkpoint_list()
476 		transaction = next_transaction;  in __jbd2_journal_clean_checkpoint_list()
477 		next_transaction = transaction->t_cpnext;  in __jbd2_journal_clean_checkpoint_list()
478 		ret = journal_clean_one_cp_list(transaction->t_checkpoint_list,  in __jbd2_journal_clean_checkpoint_list()
494 		ret = journal_clean_one_cp_list(transaction->  in __jbd2_journal_clean_checkpoint_list()
499 		 * Stop scanning if we couldn't free the transaction. This  in __jbd2_journal_clean_checkpoint_list()
505 	} while (transaction != last_transaction);  in __jbd2_journal_clean_checkpoint_list()
535  * We cannot safely clean a transaction out of the log until all of the
536  * buffer updates committed in that transaction have safely been stored
538  * transaction need to be maintained on the transaction's checkpoint
540  * called to remove the buffer from the existing transaction's
543  * The function returns 1 if it frees the transaction, 0 otherwise.
551 	transaction_t *transaction;  in __jbd2_journal_remove_checkpoint()  local
557 	if ((transaction = jh->b_cp_transaction) == NULL) {  in __jbd2_journal_remove_checkpoint()
558 		JBUFFER_TRACE(jh, "not on transaction");  in __jbd2_journal_remove_checkpoint()
561 	journal = transaction->t_journal;  in __jbd2_journal_remove_checkpoint()
563 	JBUFFER_TRACE(jh, "removing from transaction");  in __jbd2_journal_remove_checkpoint()
568 	if (transaction->t_checkpoint_list != NULL ||  in __jbd2_journal_remove_checkpoint()
569 	    transaction->t_checkpoint_io_list != NULL)  in __jbd2_journal_remove_checkpoint()
574 	 * buffer off a running or committing transaction's checkpoing list,  in __jbd2_journal_remove_checkpoint()
575 	 * then even if the checkpoint list is empty, the transaction obviously  in __jbd2_journal_remove_checkpoint()
581 	if (transaction->t_state != T_FINISHED)  in __jbd2_journal_remove_checkpoint()
584 	/* OK, that was the last buffer for the transaction: we can now  in __jbd2_journal_remove_checkpoint()
585 	   safely remove this transaction from the log */  in __jbd2_journal_remove_checkpoint()
586 	stats = &transaction->t_chp_stats;  in __jbd2_journal_remove_checkpoint()
591 				    transaction->t_tid, stats);  in __jbd2_journal_remove_checkpoint()
593 	__jbd2_journal_drop_transaction(journal, transaction);  in __jbd2_journal_remove_checkpoint()
594 	jbd2_journal_free_transaction(transaction);  in __jbd2_journal_remove_checkpoint()
602  * list so that we know when it is safe to clean the transaction out of
609 			       transaction_t *transaction)  in __jbd2_journal_insert_checkpoint()  argument
615 	/* Get reference for checkpointing transaction */  in __jbd2_journal_insert_checkpoint()
617 	jh->b_cp_transaction = transaction;  in __jbd2_journal_insert_checkpoint()
619 	if (!transaction->t_checkpoint_list) {  in __jbd2_journal_insert_checkpoint()
622 		jh->b_cpnext = transaction->t_checkpoint_list;  in __jbd2_journal_insert_checkpoint()
623 		jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev;  in __jbd2_journal_insert_checkpoint()
627 	transaction->t_checkpoint_list = jh;  in __jbd2_journal_insert_checkpoint()
631  * We've finished with this transaction structure: adios...
633  * The transaction must have no links except for the checkpoint by this
640 void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)  in __jbd2_journal_drop_transaction()  argument
643 	if (transaction->t_cpnext) {  in __jbd2_journal_drop_transaction()
644 		transaction->t_cpnext->t_cpprev = transaction->t_cpprev;  in __jbd2_journal_drop_transaction()
645 		transaction->t_cpprev->t_cpnext = transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
646 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
648 				transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
649 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
653 	J_ASSERT(transaction->t_state == T_FINISHED);  in __jbd2_journal_drop_transaction()
654 	J_ASSERT(transaction->t_buffers == NULL);  in __jbd2_journal_drop_transaction()
655 	J_ASSERT(transaction->t_forget == NULL);  in __jbd2_journal_drop_transaction()
656 	J_ASSERT(transaction->t_shadow_list == NULL);  in __jbd2_journal_drop_transaction()
657 	J_ASSERT(transaction->t_checkpoint_list == NULL);  in __jbd2_journal_drop_transaction()
658 	J_ASSERT(transaction->t_checkpoint_io_list == NULL);  in __jbd2_journal_drop_transaction()
659 	J_ASSERT(atomic_read(&transaction->t_updates) == 0);  in __jbd2_journal_drop_transaction()
660 	J_ASSERT(journal->j_committing_transaction != transaction);  in __jbd2_journal_drop_transaction()
661 	J_ASSERT(journal->j_running_transaction != transaction);  in __jbd2_journal_drop_transaction()
663 	trace_jbd2_drop_transaction(journal, transaction);  in __jbd2_journal_drop_transaction()
665 	jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);  in __jbd2_journal_drop_transaction()