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Commit 999646e3 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  cfq-iosched: do not leak ioc_data across iosched switches
  splice: fix infinite loop in generic_file_splice_read()
parents 76b0c26a 4faa3c81

block/cfq-iosched.c

+6 −3
Original line number Diff line number Diff line
@@ -1214,6 +1214,8 @@ static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) 
static void __cfq_exit_single_io_context(struct cfq_data *cfqd,

					 struct cfq_io_context *cic)

{

	struct io_context *ioc = cic->ioc;



	list_del_init(&cic->queue_list);



	/*
@@ -1223,6 +1225,9 @@ static void __cfq_exit_single_io_context(struct cfq_data *cfqd, 
	cic->dead_key = (unsigned long) cic->key;

	cic->key = NULL;



	if (ioc->ioc_data == cic)

		rcu_assign_pointer(ioc->ioc_data, NULL);



	if (cic->cfqq[ASYNC]) {

		cfq_exit_cfqq(cfqd, cic->cfqq[ASYNC]);

		cic->cfqq[ASYNC] = NULL;
@@ -1255,7 +1260,6 @@ static void cfq_exit_single_io_context(struct io_context *ioc, 
 */

static void cfq_exit_io_context(struct io_context *ioc)

{

	rcu_assign_pointer(ioc->ioc_data, NULL);

	call_for_each_cic(ioc, cfq_exit_single_io_context);

}
@@ -1478,8 +1482,7 @@ cfq_drop_dead_cic(struct cfq_data *cfqd, struct io_context *ioc, 


	spin_lock_irqsave(&ioc->lock, flags);



	if (ioc->ioc_data == cic)

		rcu_assign_pointer(ioc->ioc_data, NULL);

	BUG_ON(ioc->ioc_data == cic);



	radix_tree_delete(&ioc->radix_root, (unsigned long) cfqd);

	hlist_del_rcu(&cic->cic_list);

fs/splice.c

+6 −25
Original line number Diff line number Diff line
@@ -370,8 +370,10 @@ __generic_file_splice_read(struct file *in, loff_t *ppos, 
			 * for an in-flight io page

			 */

			if (flags & SPLICE_F_NONBLOCK) {

				if (TestSetPageLocked(page))

				if (TestSetPageLocked(page)) {

					error = -EAGAIN;

					break;

				}

			} else

				lock_page(page);
@@ -479,9 +481,8 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos, 
				 struct pipe_inode_info *pipe, size_t len,

				 unsigned int flags)

{

	ssize_t spliced;

	int ret;

	loff_t isize, left;

	int ret;



	isize = i_size_read(in->f_mapping->host);

	if (unlikely(*ppos >= isize))
@@ -491,29 +492,9 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos, 
	if (unlikely(left < len))

		len = left;



	ret = 0;

	spliced = 0;

	while (len && !spliced) {

	ret = __generic_file_splice_read(in, ppos, pipe, len, flags);



		if (ret < 0)

			break;

		else if (!ret) {

			if (spliced)

				break;

			if (flags & SPLICE_F_NONBLOCK) {

				ret = -EAGAIN;

				break;

			}

		}



	if (ret > 0)

		*ppos += ret;

		len -= ret;

		spliced += ret;

	}



	if (spliced)

		return spliced;



	return ret;

}