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.
126 		 * transaction to complete.  If there is absolutely no way  in __jbd2_log_wait_for_space()
199  * Perform an actual checkpoint. We take the first transaction on the
210 	transaction_t		*transaction;  in jbd2_log_do_checkpoint()  local
228 	 * OK, we need to start writing disk blocks.  Take one transaction  in jbd2_log_do_checkpoint()
235 	transaction = journal->j_checkpoint_transactions;  in jbd2_log_do_checkpoint()
236 	if (transaction->t_chp_stats.cs_chp_time == 0)  in jbd2_log_do_checkpoint()
237 		transaction->t_chp_stats.cs_chp_time = jiffies;  in jbd2_log_do_checkpoint()
238 	this_tid = transaction->t_tid;  in jbd2_log_do_checkpoint()
241 	 * If someone cleaned up this transaction while we slept, we're  in jbd2_log_do_checkpoint()
242 	 * done (maybe it's a new transaction, but it fell at the same  in jbd2_log_do_checkpoint()
245 	if (journal->j_checkpoint_transactions != transaction ||  in jbd2_log_do_checkpoint()
246 	    transaction->t_tid != this_tid)  in jbd2_log_do_checkpoint()
249 	/* checkpoint all of the transaction's buffers */  in jbd2_log_do_checkpoint()
250 	while (transaction->t_checkpoint_list) {  in jbd2_log_do_checkpoint()
251 		jh = transaction->t_checkpoint_list;  in jbd2_log_do_checkpoint()
267 			transaction->t_chp_stats.cs_forced_to_close++;  in jbd2_log_do_checkpoint()
302 				/* The transaction was released; we're done */  in jbd2_log_do_checkpoint()
309 		 * lock.  We cannot afford to let the transaction  in jbd2_log_do_checkpoint()
319 		transaction->t_chp_stats.cs_written++;  in jbd2_log_do_checkpoint()
337 	 * Now we issued all of the transaction's buffers, let's deal  in jbd2_log_do_checkpoint()
341 	/* Did somebody clean up the transaction in the meanwhile? */  in jbd2_log_do_checkpoint()
342 	if (journal->j_checkpoint_transactions != transaction ||  in jbd2_log_do_checkpoint()
343 	    transaction->t_tid != this_tid)  in jbd2_log_do_checkpoint()
346 	while (transaction->t_checkpoint_io_list) {  in jbd2_log_do_checkpoint()
347 		jh = transaction->t_checkpoint_io_list;  in jbd2_log_do_checkpoint()
391  * aware of transaction aborts.  Checkpointing involves writing to the
434  * Returns 1 if we freed the transaction, 0 otherwise.
480 	transaction_t *transaction, *last_transaction, *next_transaction;  in __jbd2_journal_clean_checkpoint_list()  local
483 	transaction = journal->j_checkpoint_transactions;  in __jbd2_journal_clean_checkpoint_list()
484 	if (!transaction)  in __jbd2_journal_clean_checkpoint_list()
487 	last_transaction = transaction->t_cpprev;  in __jbd2_journal_clean_checkpoint_list()
488 	next_transaction = transaction;  in __jbd2_journal_clean_checkpoint_list()
490 		transaction = next_transaction;  in __jbd2_journal_clean_checkpoint_list()
491 		next_transaction = transaction->t_cpnext;  in __jbd2_journal_clean_checkpoint_list()
492 		ret = journal_clean_one_cp_list(transaction->t_checkpoint_list,  in __jbd2_journal_clean_checkpoint_list()
508 		ret = journal_clean_one_cp_list(transaction->  in __jbd2_journal_clean_checkpoint_list()
513 		 * Stop scanning if we couldn't free the transaction. This  in __jbd2_journal_clean_checkpoint_list()
519 	} while (transaction != last_transaction);  in __jbd2_journal_clean_checkpoint_list()
549  * We cannot safely clean a transaction out of the log until all of the
550  * buffer updates committed in that transaction have safely been stored
552  * transaction need to be maintained on the transaction's checkpoint
554  * called to remove the buffer from the existing transaction's
557  * The function returns 1 if it frees the transaction, 0 otherwise.
565 	transaction_t *transaction;  in __jbd2_journal_remove_checkpoint()  local
571 	if ((transaction = jh->b_cp_transaction) == NULL) {  in __jbd2_journal_remove_checkpoint()
572 		JBUFFER_TRACE(jh, "not on transaction");  in __jbd2_journal_remove_checkpoint()
575 	journal = transaction->t_journal;  in __jbd2_journal_remove_checkpoint()
577 	JBUFFER_TRACE(jh, "removing from transaction");  in __jbd2_journal_remove_checkpoint()
582 	if (transaction->t_checkpoint_list != NULL ||  in __jbd2_journal_remove_checkpoint()
583 	    transaction->t_checkpoint_io_list != NULL)  in __jbd2_journal_remove_checkpoint()
588 	 * buffer off a running or committing transaction's checkpoing list,  in __jbd2_journal_remove_checkpoint()
589 	 * then even if the checkpoint list is empty, the transaction obviously  in __jbd2_journal_remove_checkpoint()
595 	if (transaction->t_state != T_FINISHED)  in __jbd2_journal_remove_checkpoint()
598 	/* OK, that was the last buffer for the transaction: we can now  in __jbd2_journal_remove_checkpoint()
599 	   safely remove this transaction from the log */  in __jbd2_journal_remove_checkpoint()
600 	stats = &transaction->t_chp_stats;  in __jbd2_journal_remove_checkpoint()
605 				    transaction->t_tid, stats);  in __jbd2_journal_remove_checkpoint()
607 	__jbd2_journal_drop_transaction(journal, transaction);  in __jbd2_journal_remove_checkpoint()
608 	jbd2_journal_free_transaction(transaction);  in __jbd2_journal_remove_checkpoint()
616  * list so that we know when it is safe to clean the transaction out of
623 			       transaction_t *transaction)  in __jbd2_journal_insert_checkpoint()  argument
629 	/* Get reference for checkpointing transaction */  in __jbd2_journal_insert_checkpoint()
631 	jh->b_cp_transaction = transaction;  in __jbd2_journal_insert_checkpoint()
633 	if (!transaction->t_checkpoint_list) {  in __jbd2_journal_insert_checkpoint()
636 		jh->b_cpnext = transaction->t_checkpoint_list;  in __jbd2_journal_insert_checkpoint()
637 		jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev;  in __jbd2_journal_insert_checkpoint()
641 	transaction->t_checkpoint_list = jh;  in __jbd2_journal_insert_checkpoint()
645  * We've finished with this transaction structure: adios...
647  * The transaction must have no links except for the checkpoint by this
654 void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)  in __jbd2_journal_drop_transaction()  argument
657 	if (transaction->t_cpnext) {  in __jbd2_journal_drop_transaction()
658 		transaction->t_cpnext->t_cpprev = transaction->t_cpprev;  in __jbd2_journal_drop_transaction()
659 		transaction->t_cpprev->t_cpnext = transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
660 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
662 				transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
663 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
667 	J_ASSERT(transaction->t_state == T_FINISHED);  in __jbd2_journal_drop_transaction()
668 	J_ASSERT(transaction->t_buffers == NULL);  in __jbd2_journal_drop_transaction()
669 	J_ASSERT(transaction->t_forget == NULL);  in __jbd2_journal_drop_transaction()
670 	J_ASSERT(transaction->t_shadow_list == NULL);  in __jbd2_journal_drop_transaction()
671 	J_ASSERT(transaction->t_checkpoint_list == NULL);  in __jbd2_journal_drop_transaction()
672 	J_ASSERT(transaction->t_checkpoint_io_list == NULL);  in __jbd2_journal_drop_transaction()
673 	J_ASSERT(atomic_read(&transaction->t_updates) == 0);  in __jbd2_journal_drop_transaction()
674 	J_ASSERT(journal->j_committing_transaction != transaction);  in __jbd2_journal_drop_transaction()
675 	J_ASSERT(journal->j_running_transaction != transaction);  in __jbd2_journal_drop_transaction()
677 	trace_jbd2_drop_transaction(journal, transaction);  in __jbd2_journal_drop_transaction()
679 	jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);  in __jbd2_journal_drop_transaction()