From 107c161b7ddeeb7da43509cc6b29211885ccd9af Mon Sep 17 00:00:00 2001
From: Nitin Gupta <ngupta@vflare.org>
Date: Mon, 17 May 2010 11:02:44 +0530
Subject: [PATCH] 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: Nitin Gupta <ngupta@vflare.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Nigel Cunningham <nigel@tuxonice.net>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/staging/ramzswap/TODO | 5 -----
drivers/staging/ramzswap/ramzswap_drv.c | 22 +++++++++++++---------
2 files changed, 13 insertions(+), 14 deletions(-)
delete mode 100644 drivers/staging/ramzswap/TODO
diff --git a/drivers/staging/ramzswap/TODO b/drivers/staging/ramzswap/TODO
deleted file mode 100644
index 8d64e28fac0e..000000000000
--- a/drivers/staging/ramzswap/TODO
+++ /dev/null
@@ -1,5 +0,0 @@
-TODO:
- - Add support for swap notifiers
-
-Please send patches to Greg Kroah-Hartman <greg@kroah.com> and
-Nitin Gupta <ngupta@vflare.org>
diff --git a/drivers/staging/ramzswap/ramzswap_drv.c b/drivers/staging/ramzswap/ramzswap_drv.c
index 167f8d17a808..d14bf9129e36 100644
--- a/drivers/staging/ramzswap/ramzswap_drv.c
+++ b/drivers/staging/ramzswap/ramzswap_drv.c
@@ -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 @@ static int ramzswap_ioctl(struct block_device *bdev, fmode_t mode,
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)
--
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