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
---
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 8d64e28..0000000
--- 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@xxxxxxxxx> and
-Nitin Gupta <ngupta@xxxxxxxxxx>
diff --git a/drivers/staging/ramzswap/ramzswap_drv.c b/drivers/staging/ramzswap/ramzswap_drv.c
index ee5eb12..ab15276 100644
--- a/drivers/staging/ramzswap/ramzswap_drv.c
+++ b/drivers/staging/ramzswap/ramzswap_drv.c
@@ -795,14 +795,6 @@ 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);
@@ -1295,9 +1287,21 @@ 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)
--
1.6.6.1
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