diff options
Diffstat (limited to 'drivers/block/drbd/drbd_receiver.c')
| -rw-r--r-- | drivers/block/drbd/drbd_receiver.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 3cdadf75c82d..c9e8d61dea24 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -3980,6 +3980,7 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL; enum determine_dev_size dd = DS_UNCHANGED; sector_t p_size, p_usize, p_csize, my_usize; + sector_t new_size, cur_size; int ldsc = 0; /* local disk size changed */ enum dds_flags ddsf; @@ -3987,6 +3988,7 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info if (!peer_device) return config_unknown_volume(connection, pi); device = peer_device->device; + cur_size = drbd_get_capacity(device->this_bdev); p_size = be64_to_cpu(p->d_size); p_usize = be64_to_cpu(p->u_size); @@ -3997,7 +3999,6 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info device->p_size = p_size; if (get_ldev(device)) { - sector_t new_size, cur_size; rcu_read_lock(); my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; rcu_read_unlock(); @@ -4015,7 +4016,6 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info /* Never shrink a device with usable data during connect. But allow online shrinking if we are connected. */ new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0); - cur_size = drbd_get_capacity(device->this_bdev); if (new_size < cur_size && device->state.disk >= D_OUTDATED && device->state.conn < C_CONNECTED) { @@ -4080,9 +4080,36 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info * * However, if he sends a zero current size, * take his (user-capped or) backing disk size anyways. + * + * Unless of course he does not have a disk himself. + * In which case we ignore this completely. */ + sector_t new_size = p_csize ?: p_usize ?: p_size; drbd_reconsider_queue_parameters(device, NULL, o); - drbd_set_my_capacity(device, p_csize ?: p_usize ?: p_size); + if (new_size == 0) { + /* Ignore, peer does not know nothing. */ + } else if (new_size == cur_size) { + /* nothing to do */ + } else if (cur_size != 0 && p_size == 0) { + drbd_warn(device, "Ignored diskless peer device size (peer:%llu != me:%llu sectors)!\n", + (unsigned long long)new_size, (unsigned long long)cur_size); + } else if (new_size < cur_size && device->state.role == R_PRIMARY) { + drbd_err(device, "The peer's device size is too small! (%llu < %llu sectors); demote me first!\n", + (unsigned long long)new_size, (unsigned long long)cur_size); + conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); + return -EIO; + } else { + /* I believe the peer, if + * - I don't have a current size myself + * - we agree on the size anyways + * - I do have a current size, am Secondary, + * and he has the only disk + * - I do have a current size, am Primary, + * and he has the only disk, + * which is larger than my current size + */ + drbd_set_my_capacity(device, new_size); + } } if (get_ldev(device)) { |