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()
118 		 * transaction to complete.  If there is absolutely no way  in __jbd2_log_wait_for_space()
194  * Perform an actual checkpoint. We take the first transaction on the
205 	transaction_t		*transaction;  in jbd2_log_do_checkpoint()  local
223 	 * OK, we need to start writing disk blocks.  Take one transaction  in jbd2_log_do_checkpoint()
229 	transaction = journal->j_checkpoint_transactions;  in jbd2_log_do_checkpoint()
230 	if (transaction->t_chp_stats.cs_chp_time == 0)  in jbd2_log_do_checkpoint()
231 		transaction->t_chp_stats.cs_chp_time = jiffies;  in jbd2_log_do_checkpoint()
232 	this_tid = transaction->t_tid;  in jbd2_log_do_checkpoint()
235 	 * If someone cleaned up this transaction while we slept, we're  in jbd2_log_do_checkpoint()
236 	 * done (maybe it's a new transaction, but it fell at the same  in jbd2_log_do_checkpoint()
239 	if (journal->j_checkpoint_transactions != transaction ||  in jbd2_log_do_checkpoint()
240 	    transaction->t_tid != this_tid)  in jbd2_log_do_checkpoint()
243 	/* checkpoint all of the transaction's buffers */  in jbd2_log_do_checkpoint()
244 	while (transaction->t_checkpoint_list) {  in jbd2_log_do_checkpoint()
245 		jh = transaction->t_checkpoint_list;  in jbd2_log_do_checkpoint()
261 			transaction->t_chp_stats.cs_forced_to_close++;  in jbd2_log_do_checkpoint()
294 				/* The transaction was released; we're done */  in jbd2_log_do_checkpoint()
301 		 * lock.  We cannot afford to let the transaction  in jbd2_log_do_checkpoint()
311 		transaction->t_chp_stats.cs_written++;  in jbd2_log_do_checkpoint()
329 	 * Now we issued all of the transaction's buffers, let's deal  in jbd2_log_do_checkpoint()
333 	/* Did somebody clean up the transaction in the meanwhile? */  in jbd2_log_do_checkpoint()
334 	if (journal->j_checkpoint_transactions != transaction ||  in jbd2_log_do_checkpoint()
335 	    transaction->t_tid != this_tid)  in jbd2_log_do_checkpoint()
338 	while (transaction->t_checkpoint_io_list) {  in jbd2_log_do_checkpoint()
339 		jh = transaction->t_checkpoint_io_list;  in jbd2_log_do_checkpoint()
378  * aware of transaction aborts.  Checkpointing involves writing to the
421  * Returns 1 if we freed the transaction, 0 otherwise.
458  * and try to release them. If the whole transaction is released, set
511 	transaction_t *transaction, *last_transaction, *next_transaction;  in jbd2_journal_shrink_checkpoint_list()  local
526 	 * Get next shrink transaction, resume previous scan or start  in jbd2_journal_shrink_checkpoint_list()
527 	 * over again. If some others do checkpoint and drop transaction  in jbd2_journal_shrink_checkpoint_list()
532 		transaction = journal->j_shrink_transaction;  in jbd2_journal_shrink_checkpoint_list()
534 		transaction = journal->j_checkpoint_transactions;  in jbd2_journal_shrink_checkpoint_list()
537 		first_tid = transaction->t_tid;  in jbd2_journal_shrink_checkpoint_list()
539 	next_transaction = transaction;  in jbd2_journal_shrink_checkpoint_list()
542 		transaction = next_transaction;  in jbd2_journal_shrink_checkpoint_list()
543 		next_transaction = transaction->t_cpnext;  in jbd2_journal_shrink_checkpoint_list()
544 		tid = transaction->t_tid;  in jbd2_journal_shrink_checkpoint_list()
547 		nr_freed += journal_shrink_one_cp_list(transaction->t_checkpoint_list,  in jbd2_journal_shrink_checkpoint_list()
556 		nr_freed += journal_shrink_one_cp_list(transaction->t_checkpoint_io_list,  in jbd2_journal_shrink_checkpoint_list()
562 	} while (transaction != last_transaction);  in jbd2_journal_shrink_checkpoint_list()
564 	if (transaction != last_transaction) {  in jbd2_journal_shrink_checkpoint_list()
595 	transaction_t *transaction, *last_transaction, *next_transaction;  in __jbd2_journal_clean_checkpoint_list()  local
598 	transaction = journal->j_checkpoint_transactions;  in __jbd2_journal_clean_checkpoint_list()
599 	if (!transaction)  in __jbd2_journal_clean_checkpoint_list()
602 	last_transaction = transaction->t_cpprev;  in __jbd2_journal_clean_checkpoint_list()
603 	next_transaction = transaction;  in __jbd2_journal_clean_checkpoint_list()
605 		transaction = next_transaction;  in __jbd2_journal_clean_checkpoint_list()
606 		next_transaction = transaction->t_cpnext;  in __jbd2_journal_clean_checkpoint_list()
607 		ret = journal_clean_one_cp_list(transaction->t_checkpoint_list,  in __jbd2_journal_clean_checkpoint_list()
623 		ret = journal_clean_one_cp_list(transaction->  in __jbd2_journal_clean_checkpoint_list()
628 		 * Stop scanning if we couldn't free the transaction. This  in __jbd2_journal_clean_checkpoint_list()
634 	} while (transaction != last_transaction);  in __jbd2_journal_clean_checkpoint_list()
664  * We cannot safely clean a transaction out of the log until all of the
665  * buffer updates committed in that transaction have safely been stored
667  * transaction need to be maintained on the transaction's checkpoint
669  * called to remove the buffer from the existing transaction's
672  * The function returns 1 if it frees the transaction, 0 otherwise.
680 	transaction_t *transaction;  in __jbd2_journal_remove_checkpoint()  local
686 	transaction = jh->b_cp_transaction;  in __jbd2_journal_remove_checkpoint()
687 	if (!transaction) {  in __jbd2_journal_remove_checkpoint()
688 		JBUFFER_TRACE(jh, "not on transaction");  in __jbd2_journal_remove_checkpoint()
691 	journal = transaction->t_journal;  in __jbd2_journal_remove_checkpoint()
693 	JBUFFER_TRACE(jh, "removing from transaction");  in __jbd2_journal_remove_checkpoint()
710 	/* Is this transaction empty? */  in __jbd2_journal_remove_checkpoint()
711 	if (transaction->t_checkpoint_list || transaction->t_checkpoint_io_list)  in __jbd2_journal_remove_checkpoint()
716 	 * buffer off a running or committing transaction's checkpoing list,  in __jbd2_journal_remove_checkpoint()
717 	 * then even if the checkpoint list is empty, the transaction obviously  in __jbd2_journal_remove_checkpoint()
723 	if (transaction->t_state != T_FINISHED)  in __jbd2_journal_remove_checkpoint()
727 	 * OK, that was the last buffer for the transaction, we can now  in __jbd2_journal_remove_checkpoint()
728 	 * safely remove this transaction from the log.  in __jbd2_journal_remove_checkpoint()
730 	stats = &transaction->t_chp_stats;  in __jbd2_journal_remove_checkpoint()
735 				    transaction->t_tid, stats);  in __jbd2_journal_remove_checkpoint()
737 	__jbd2_journal_drop_transaction(journal, transaction);  in __jbd2_journal_remove_checkpoint()
738 	jbd2_journal_free_transaction(transaction);  in __jbd2_journal_remove_checkpoint()
744  * list so that we know when it is safe to clean the transaction out of
751 			       transaction_t *transaction)  in __jbd2_journal_insert_checkpoint()  argument
757 	/* Get reference for checkpointing transaction */  in __jbd2_journal_insert_checkpoint()
759 	jh->b_cp_transaction = transaction;  in __jbd2_journal_insert_checkpoint()
761 	if (!transaction->t_checkpoint_list) {  in __jbd2_journal_insert_checkpoint()
764 		jh->b_cpnext = transaction->t_checkpoint_list;  in __jbd2_journal_insert_checkpoint()
765 		jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev;  in __jbd2_journal_insert_checkpoint()
769 	transaction->t_checkpoint_list = jh;  in __jbd2_journal_insert_checkpoint()
770 	percpu_counter_inc(&transaction->t_journal->j_checkpoint_jh_count);  in __jbd2_journal_insert_checkpoint()
774  * We've finished with this transaction structure: adios...
776  * The transaction must have no links except for the checkpoint by this
783 void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)  in __jbd2_journal_drop_transaction()  argument
788 	if (transaction->t_cpnext) {  in __jbd2_journal_drop_transaction()
789 		transaction->t_cpnext->t_cpprev = transaction->t_cpprev;  in __jbd2_journal_drop_transaction()
790 		transaction->t_cpprev->t_cpnext = transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
791 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
793 				transaction->t_cpnext;  in __jbd2_journal_drop_transaction()
794 		if (journal->j_checkpoint_transactions == transaction)  in __jbd2_journal_drop_transaction()
798 	J_ASSERT(transaction->t_state == T_FINISHED);  in __jbd2_journal_drop_transaction()
799 	J_ASSERT(transaction->t_buffers == NULL);  in __jbd2_journal_drop_transaction()
800 	J_ASSERT(transaction->t_forget == NULL);  in __jbd2_journal_drop_transaction()
801 	J_ASSERT(transaction->t_shadow_list == NULL);  in __jbd2_journal_drop_transaction()
802 	J_ASSERT(transaction->t_checkpoint_list == NULL);  in __jbd2_journal_drop_transaction()
803 	J_ASSERT(transaction->t_checkpoint_io_list == NULL);  in __jbd2_journal_drop_transaction()
804 	J_ASSERT(atomic_read(&transaction->t_updates) == 0);  in __jbd2_journal_drop_transaction()
805 	J_ASSERT(journal->j_committing_transaction != transaction);  in __jbd2_journal_drop_transaction()
806 	J_ASSERT(journal->j_running_transaction != transaction);  in __jbd2_journal_drop_transaction()
808 	trace_jbd2_drop_transaction(journal, transaction);  in __jbd2_journal_drop_transaction()
810 	jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);  in __jbd2_journal_drop_transaction()