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Commit 107c161b authored by Nitin Gupta's avatar Nitin Gupta Committed by Greg Kroah-Hartman
Browse files

Staging: ramzswap: Handler for swap slot free callback 



Install handler for swap_slot_free_notify callback which is called
when a swap slot is no longer used. This handler immediately frees
memory allocated corresponding to the given swap slot.

Signed-off-by: default avatarNitin Gupta <ngupta@vflare.org>
Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Acked-by: default avatarNigel Cunningham <nigel@tuxonice.net>
Acked-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Reviewed-by: default avatarMinchan Kim <minchan.kim@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent b3a27d05

drivers/staging/ramzswap/TODO

deleted100644 → 0
+0 −5
Original line number Diff line number Diff line 
TODO:

	- Add support for swap notifiers



Please send patches to Greg Kroah-Hartman <greg@kroah.com> and

Nitin Gupta <ngupta@vflare.org>

drivers/staging/ramzswap/ramzswap_drv.c

+13 −9
Original line number Diff line number Diff line
@@ -335,14 +335,6 @@ static int ramzswap_write(struct ramzswap *rzs, struct bio *bio) 


	src = rzs->compress_buffer;



	/*

	 * System swaps to same sector again when the stored page

	 * is no longer referenced by any process. So, its now safe

	 * to free the memory that was allocated for this page.

	 */

	if (rzs->table[index].page || rzs_test_flag(rzs, index, RZS_ZERO))

		ramzswap_free_page(rzs, index);



	mutex_lock(&rzs->lock);



	user_mem = kmap_atomic(page, KM_USER0);
@@ -690,9 +682,21 @@ out: 
	return ret;

}



void ramzswap_slot_free_notify(struct block_device *bdev, unsigned long index)

{

	struct ramzswap *rzs;



	rzs = bdev->bd_disk->private_data;

	ramzswap_free_page(rzs, index);

	rzs_stat64_inc(rzs, &rzs->stats.notify_free);



	return;

}



static struct block_device_operations ramzswap_devops = {

	.ioctl = ramzswap_ioctl,

	.owner = THIS_MODULE,

	.swap_slot_free_notify = ramzswap_slot_free_notify,

	.owner = THIS_MODULE

};



static int create_device(struct ramzswap *rzs, int device_id)