[PATCH 01/30] drbd: bitmap bulk IO: do not always suspend IO

[Philipp Reisner]

From: Lars Ellenberg <lars.ellenb...@linbit.com>

The intention was to only suspend IO if some normal bitmap operation is
supposed to be locked out, not always. If the bulk operation is flaged
as BM_LOCKED_CHANGE_ALLOWED, we do not need to suspend IO.

Signed-off-by: Philipp Reisner <philipp.reis...@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenb...@linbit.com>
---
 drivers/block/drbd/drbd_main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 2b37744..2891631 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -3587,18 +3587,20 @@ void drbd_queue_bitmap_io(struct drbd_device *device,
 int drbd_bitmap_io(struct drbd_device *device, int (*io_fn)(struct drbd_device 
*),
                char *why, enum bm_flag flags)
 {
+       /* Only suspend io, if some operation is supposed to be locked out */
+       const bool do_suspend_io = flags & 
(BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST);
        int rv;
 
        D_ASSERT(device, current != 
first_peer_device(device)->connection->worker.task);
 
-       if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
+       if (do_suspend_io)
                drbd_suspend_io(device);
 
        drbd_bm_lock(device, why, flags);
        rv = io_fn(device);
        drbd_bm_unlock(device);
 
-       if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
+       if (do_suspend_io)
                drbd_resume_io(device);
 
        return rv;
-- 
2.7.4