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Subject[PATCH 09/11] drbd: receive_protocol(): Make the program flow less confusing
Date
From: Andreas Gruenbacher <agruen@linbit.com>

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_receiver.c | 73 +++++++++++++++++------------------
1 files changed, 35 insertions(+), 38 deletions(-)

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 11f2e72..06bbf0f 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3083,55 +3083,52 @@ static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi)

synchronize_rcu();
kfree(old_net_conf);
+ } else {
+ clear_bit(CONN_DRY_RUN, &tconn->flags);

- return 0;
- }
-
- clear_bit(CONN_DRY_RUN, &tconn->flags);
+ if (cf & CF_DRY_RUN)
+ set_bit(CONN_DRY_RUN, &tconn->flags);

- if (cf & CF_DRY_RUN)
- set_bit(CONN_DRY_RUN, &tconn->flags);
+ rcu_read_lock();
+ nc = rcu_dereference(tconn->net_conf);

- rcu_read_lock();
- nc = rcu_dereference(tconn->net_conf);
+ if (p_proto != nc->wire_protocol) {
+ conn_err(tconn, "incompatible communication protocols\n");
+ goto disconnect_rcu_unlock;
+ }

- if (p_proto != nc->wire_protocol) {
- conn_err(tconn, "incompatible communication protocols\n");
- goto disconnect_rcu_unlock;
- }
+ if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) {
+ conn_err(tconn, "incompatible after-sb-0pri settings\n");
+ goto disconnect_rcu_unlock;
+ }

- if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) {
- conn_err(tconn, "incompatible after-sb-0pri settings\n");
- goto disconnect_rcu_unlock;
- }
+ if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) {
+ conn_err(tconn, "incompatible after-sb-1pri settings\n");
+ goto disconnect_rcu_unlock;
+ }

- if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) {
- conn_err(tconn, "incompatible after-sb-1pri settings\n");
- goto disconnect_rcu_unlock;
- }
+ if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) {
+ conn_err(tconn, "incompatible after-sb-2pri settings\n");
+ goto disconnect_rcu_unlock;
+ }

- if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) {
- conn_err(tconn, "incompatible after-sb-2pri settings\n");
- goto disconnect_rcu_unlock;
- }
+ if (p_discard_my_data && nc->discard_my_data) {
+ conn_err(tconn, "both sides have the 'discard_my_data' flag set\n");
+ goto disconnect_rcu_unlock;
+ }

- if (p_discard_my_data && nc->discard_my_data) {
- conn_err(tconn, "both sides have the 'discard_my_data' flag set\n");
- goto disconnect_rcu_unlock;
- }
+ if (p_two_primaries != nc->two_primaries) {
+ conn_err(tconn, "incompatible setting of the two-primaries options\n");
+ goto disconnect_rcu_unlock;
+ }

- if (p_two_primaries != nc->two_primaries) {
- conn_err(tconn, "incompatible setting of the two-primaries options\n");
- goto disconnect_rcu_unlock;
- }
+ if (strcmp(integrity_alg, nc->integrity_alg)) {
+ conn_err(tconn, "incompatible setting of the data-integrity-alg\n");
+ goto disconnect_rcu_unlock;
+ }

- if (strcmp(integrity_alg, nc->integrity_alg)) {
- conn_err(tconn, "incompatible setting of the data-integrity-alg\n");
- goto disconnect_rcu_unlock;
+ rcu_read_unlock();
}
-
- rcu_read_unlock();
-
return 0;

disconnect_rcu_unlock:
--
1.7.4.1


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