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authorLars Ellenberg <lars.ellenberg@linbit.com>2016-06-14 01:26:23 +0300
committerJens Axboe <axboe@fb.com>2016-06-14 06:43:05 +0300
commit505675f96cf0f169647a18c3dda1f373eca957b1 (patch)
treecd9e16e66de8d3abfc9e69eb9a14bfe9b5f72569 /drivers/block/drbd/drbd_int.h
parent7435e9018f9141e38d856229475335c8e757a497 (diff)
downloadlinux-505675f96cf0f169647a18c3dda1f373eca957b1.tar.xz
drbd: allow larger max_discard_sectors
Make sure we have at least 67 (> AL_UPDATES_PER_TRANSACTION) al-extents available, and allow up to half of that to be discarded in one bio. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/drbd/drbd_int.h')
-rw-r--r--drivers/block/drbd/drbd_int.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 0b5a658882b2..9c68ec54a247 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1347,10 +1347,10 @@ struct bm_extent {
#define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* Header 80 only allows packets up to 32KiB data */
#define DRBD_MAX_BIO_SIZE_P95 (1U << 17) /* Protocol 95 to 99 allows bios up to 128KiB */
-/* For now, don't allow more than one activity log extent worth of data
- * to be discarded in one go. We may need to rework drbd_al_begin_io()
- * to allow for even larger discard ranges */
-#define DRBD_MAX_DISCARD_SIZE AL_EXTENT_SIZE
+/* For now, don't allow more than half of what we can "activate" in one
+ * activity log transaction to be discarded in one go. We may need to rework
+ * drbd_al_begin_io() to allow for even larger discard ranges */
+#define DRBD_MAX_DISCARD_SIZE (AL_UPDATES_PER_TRANSACTION/2*AL_EXTENT_SIZE)
#define DRBD_MAX_DISCARD_SECTORS (DRBD_MAX_DISCARD_SIZE >> 9)
extern int drbd_bm_init(struct drbd_device *device);