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>

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index d524973f94b3c7f94cba9cc712274d6cee815cf3..265b2b6ebdec269230775c526c61239a14275280 100644 (file)
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -258,7 +258,7 @@ bool drbd_al_begin_io_fastpath(struct drbd_device *device, struct drbd_interval
        unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
        unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
 
-       D_ASSERT(device, (unsigned)(last - first) <= 1);
+       D_ASSERT(device, first <= last);
        D_ASSERT(device, atomic_read(&device->local_cnt) > 0);
 
        /* FIXME figure out a fast path for bios crossing AL extent boundaries */

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 0b5a658882b22080a4884ebc0f80255a3172a20c..9c68ec54a247b4d94c21bb533ec08f5884220289 100644 (file)
--- 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);

diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index a351c40087cd663d5520c50dd0720874f6bf30b1..ddac68422a9648efbadba86a4b3a5fa9dd01b8ef 100644 (file)
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -126,8 +126,7 @@
 #define DRBD_RESYNC_RATE_DEF 250
 #define DRBD_RESYNC_RATE_SCALE 'k'  /* kilobytes */
 
-  /* less than 7 would hit performance unnecessarily. */
-#define DRBD_AL_EXTENTS_MIN  7
+#define DRBD_AL_EXTENTS_MIN  67
   /* we use u16 as "slot number", (u16)~0 is "FREE".
    * If you use >= 292 kB on-disk ring buffer,
    * this is the maximum you can use: */