[Drbd-dev] [PATCH 16/38] drbd: add comment why we want to first call local-io-error, then send state
philipp.reisner at linbit.com
Wed Nov 25 11:53:49 CET 2015
From: Lars Ellenberg <lars.ellenberg at linbit.com>
Even though we really want to get the state information about our bad
disk to the peer as soon as possible, it is useful to first call the
People may chose to hard-reset the box from there.
If that looks and behaves exactly like a "regular node crash", without
bumping the data generation UUIDs on the peer in between, it makes it
easier to deal with.
If you intend to return from the local-io-error handler, then better
return as quickly as possible to avoid triggering other timeouts.
Signed-off-by: Philipp Reisner <philipp.reisner at linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg at linbit.com>
drivers/block/drbd/drbd_state.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index 06afd4d..a4e4505 100644
@@ -1859,6 +1859,10 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &device->flags);
+ /* Intentionally call this handler first, before drbd_send_state().
+ * See: 2932204 drbd: call local-io-error handler early
+ * People may chose to hard-reset the box from this handler.
+ * It is useful if this looks like a "regular node crash". */
if (was_io_error && eh == EP_CALL_HELPER)
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