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Commit 88fe1acb authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

jbd2: fold __wait_cp_io into jbd2_log_do_checkpoint() 



__wait_cp_io() is only called by jbd2_log_do_checkpoint().  Fold it in
to make it a bit easier to understand.

Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent be1158cc

fs/jbd2/checkpoint.c

+31 −56
Original line number Diff line number Diff line
@@ -183,58 +183,6 @@ void __jbd2_log_wait_for_space(journal_t *journal) 
	}

}



/*

 * Clean up transaction's list of buffers submitted for io.

 * We wait for any pending IO to complete and remove any clean

 * buffers. Note that we take the buffers in the opposite ordering

 * from the one in which they were submitted for IO.

 *

 * Return 0 on success, and return <0 if some buffers have failed

 * to be written out.

 *

 * Called with j_list_lock held.

 */

static int __wait_cp_io(journal_t *journal, transaction_t *transaction)

{

	struct journal_head *jh;

	struct buffer_head *bh;

	tid_t this_tid;

	int released = 0;

	int ret = 0;



	this_tid = transaction->t_tid;

restart:

	/* Did somebody clean up the transaction in the meanwhile? */

	if (journal->j_checkpoint_transactions != transaction ||

			transaction->t_tid != this_tid)

		return ret;

	while (!released && transaction->t_checkpoint_io_list) {

		jh = transaction->t_checkpoint_io_list;

		bh = jh2bh(jh);

		get_bh(bh);

		if (buffer_locked(bh)) {

			spin_unlock(&journal->j_list_lock);

			wait_on_buffer(bh);

			/* the journal_head may have gone by now */

			BUFFER_TRACE(bh, "brelse");

			__brelse(bh);

			spin_lock(&journal->j_list_lock);

			goto restart;

		}

		if (unlikely(buffer_write_io_error(bh)))

			ret = -EIO;



		/*

		 * Now in whatever state the buffer currently is, we know that

		 * it has been written out and so we can drop it from the list

		 */

		released = __jbd2_journal_remove_checkpoint(jh);

		__brelse(bh);

	}



	return ret;

}



static void

__flush_batch(journal_t *journal, int *batch_count)

{
@@ -268,7 +216,7 @@ int jbd2_log_do_checkpoint(journal_t *journal) 
	struct buffer_head	*bh;

	transaction_t		*transaction;

	tid_t			this_tid;

	int			err, result, batch_count = 0;

	int			result, batch_count = 0, done = 0;



	jbd_debug(1, "Start checkpoint\n");
@@ -384,9 +332,36 @@ int jbd2_log_do_checkpoint(journal_t *journal) 
	 * Now we issued all of the transaction's buffers, let's deal

	 * with the buffers that are out for I/O.

	 */

	err = __wait_cp_io(journal, transaction);

	if (!result)

		result = err;

restart2:

	/* Did somebody clean up the transaction in the meanwhile? */

	if (journal->j_checkpoint_transactions != transaction ||

	    transaction->t_tid != this_tid)

		goto out;



	while (!done && transaction->t_checkpoint_io_list) {

		jh = transaction->t_checkpoint_io_list;

		bh = jh2bh(jh);

		get_bh(bh);

		if (buffer_locked(bh)) {

			spin_unlock(&journal->j_list_lock);

			wait_on_buffer(bh);

			/* the journal_head may have gone by now */

			BUFFER_TRACE(bh, "brelse");

			__brelse(bh);

			spin_lock(&journal->j_list_lock);

			goto restart2;

		}

		if (unlikely(buffer_write_io_error(bh)) && !result)

			result = -EIO;



		/*

		 * Now in whatever state the buffer currently is, we

		 * know that it has been written out and so we can

		 * drop it from the list

		 */

		done = __jbd2_journal_remove_checkpoint(jh);

		__brelse(bh);

	}

out:

	spin_unlock(&journal->j_list_lock);

	if (result < 0)