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Commit 0414f2ec authored by Nigel Cunningham's avatar Nigel Cunningham Committed by Rafael J. Wysocki
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PM / Hibernate: Move swap functions to kernel/power/swap.c. 



Move hibernation code's functions for allocating and freeing swap
from swsusp.c to swap.c, which is where you'd expect to find them.

Signed-off-by: default avatarNigel Cunningham <nigel@tuxonice.net>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 64357ed4

kernel/power/swap.c

+101 −0
Original line number Diff line number Diff line
@@ -38,6 +38,107 @@ struct swsusp_header { 


static struct swsusp_header *swsusp_header;



/**

 *	The following functions are used for tracing the allocated

 *	swap pages, so that they can be freed in case of an error.

 */



struct swsusp_extent {

	struct rb_node node;

	unsigned long start;

	unsigned long end;

};



static struct rb_root swsusp_extents = RB_ROOT;



static int swsusp_extents_insert(unsigned long swap_offset)

{

	struct rb_node **new = &(swsusp_extents.rb_node);

	struct rb_node *parent = NULL;

	struct swsusp_extent *ext;



	/* Figure out where to put the new node */

	while (*new) {

		ext = container_of(*new, struct swsusp_extent, node);

		parent = *new;

		if (swap_offset < ext->start) {

			/* Try to merge */

			if (swap_offset == ext->start - 1) {

				ext->start--;

				return 0;

			}

			new = &((*new)->rb_left);

		} else if (swap_offset > ext->end) {

			/* Try to merge */

			if (swap_offset == ext->end + 1) {

				ext->end++;

				return 0;

			}

			new = &((*new)->rb_right);

		} else {

			/* It already is in the tree */

			return -EINVAL;

		}

	}

	/* Add the new node and rebalance the tree. */

	ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);

	if (!ext)

		return -ENOMEM;



	ext->start = swap_offset;

	ext->end = swap_offset;

	rb_link_node(&ext->node, parent, new);

	rb_insert_color(&ext->node, &swsusp_extents);

	return 0;

}



/**

 *	alloc_swapdev_block - allocate a swap page and register that it has

 *	been allocated, so that it can be freed in case of an error.

 */



sector_t alloc_swapdev_block(int swap)

{

	unsigned long offset;



	offset = swp_offset(get_swap_page_of_type(swap));

	if (offset) {

		if (swsusp_extents_insert(offset))

			swap_free(swp_entry(swap, offset));

		else

			return swapdev_block(swap, offset);

	}

	return 0;

}



/**

 *	free_all_swap_pages - free swap pages allocated for saving image data.

 *	It also frees the extents used to register which swap entres had been

 *	allocated.

 */



void free_all_swap_pages(int swap)

{

	struct rb_node *node;



	while ((node = swsusp_extents.rb_node)) {

		struct swsusp_extent *ext;

		unsigned long offset;



		ext = container_of(node, struct swsusp_extent, node);

		rb_erase(node, &swsusp_extents);

		for (offset = ext->start; offset <= ext->end; offset++)

			swap_free(swp_entry(swap, offset));



		kfree(ext);

	}

}



int swsusp_swap_in_use(void)

{

	return (swsusp_extents.rb_node != NULL);

}



/*

 * General things

 */

kernel/power/swsusp.c

+0 −101
Original line number Diff line number Diff line
@@ -57,107 +57,6 @@ 


int in_suspend __nosavedata = 0;



/**

 *	The following functions are used for tracing the allocated

 *	swap pages, so that they can be freed in case of an error.

 */



struct swsusp_extent {

	struct rb_node node;

	unsigned long start;

	unsigned long end;

};



static struct rb_root swsusp_extents = RB_ROOT;



static int swsusp_extents_insert(unsigned long swap_offset)

{

	struct rb_node **new = &(swsusp_extents.rb_node);

	struct rb_node *parent = NULL;

	struct swsusp_extent *ext;



	/* Figure out where to put the new node */

	while (*new) {

		ext = container_of(*new, struct swsusp_extent, node);

		parent = *new;

		if (swap_offset < ext->start) {

			/* Try to merge */

			if (swap_offset == ext->start - 1) {

				ext->start--;

				return 0;

			}

			new = &((*new)->rb_left);

		} else if (swap_offset > ext->end) {

			/* Try to merge */

			if (swap_offset == ext->end + 1) {

				ext->end++;

				return 0;

			}

			new = &((*new)->rb_right);

		} else {

			/* It already is in the tree */

			return -EINVAL;

		}

	}

	/* Add the new node and rebalance the tree. */

	ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);

	if (!ext)

		return -ENOMEM;



	ext->start = swap_offset;

	ext->end = swap_offset;

	rb_link_node(&ext->node, parent, new);

	rb_insert_color(&ext->node, &swsusp_extents);

	return 0;

}



/**

 *	alloc_swapdev_block - allocate a swap page and register that it has

 *	been allocated, so that it can be freed in case of an error.

 */



sector_t alloc_swapdev_block(int swap)

{

	unsigned long offset;



	offset = swp_offset(get_swap_page_of_type(swap));

	if (offset) {

		if (swsusp_extents_insert(offset))

			swap_free(swp_entry(swap, offset));

		else

			return swapdev_block(swap, offset);

	}

	return 0;

}



/**

 *	free_all_swap_pages - free swap pages allocated for saving image data.

 *	It also frees the extents used to register which swap entres had been

 *	allocated.

 */



void free_all_swap_pages(int swap)

{

	struct rb_node *node;



	while ((node = swsusp_extents.rb_node)) {

		struct swsusp_extent *ext;

		unsigned long offset;



		ext = container_of(node, struct swsusp_extent, node);

		rb_erase(node, &swsusp_extents);

		for (offset = ext->start; offset <= ext->end; offset++)

			swap_free(swp_entry(swap, offset));



		kfree(ext);

	}

}



int swsusp_swap_in_use(void)

{

	return (swsusp_extents.rb_node != NULL);

}



/**

 *	swsusp_show_speed - print the time elapsed between two events represented by

 *	@start and @stop