drbd: Do not try to free tl_hash in drbd_disconnect() when IO is suspended
We may not free tl_hash when IO is suspended, since we can not wait
until ap_bio_cnt reaches zero.
We can do this after susp reched 0, since then tl_clear was called
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index aa9bb21..f84ffb1 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1493,6 +1493,7 @@
extern void drbd_set_recv_tcq(struct drbd_conf *mdev, int tcq_enabled);
extern void _drbd_clear_done_ee(struct drbd_conf *mdev, struct list_head *to_be_freed);
extern void drbd_flush_workqueue(struct drbd_conf *mdev);
+extern void drbd_free_tl_hash(struct drbd_conf *mdev);
/* yes, there is kernel_setsockopt, but only since 2.6.18. we don't need to
* mess with get_fs/set_fs, we know we are KERNEL_DS always. */
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 9fe9bdd..8d14635 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1409,6 +1409,10 @@
(os.user_isp && !ns.user_isp))
resume_next_sg(mdev);
+ /* free tl_hash if we Got thawed and are C_STANDALONE */
+ if (ns.conn == C_STANDALONE && ns.susp == 0 && mdev->tl_hash)
+ drbd_free_tl_hash(mdev);
+
/* Upon network connection, we need to start the receiver */
if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
drbd_thread_start(&mdev->receiver);
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index dc0a9ac..6c08e63 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1391,6 +1391,7 @@
}
}
+ drbd_flush_workqueue(mdev);
spin_lock_irq(&mdev->req_lock);
if (mdev->net_conf != NULL) {
retcode = ERR_NET_CONFIGURED;
@@ -1429,10 +1430,9 @@
mdev->int_dig_out=int_dig_out;
mdev->int_dig_in=int_dig_in;
mdev->int_dig_vv=int_dig_vv;
+ retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
spin_unlock_irq(&mdev->req_lock);
- retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
-
kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 22d74d7..5e49ee7 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3691,6 +3691,36 @@
wait_for_completion(&barr.done);
}
+void drbd_free_tl_hash(struct drbd_conf *mdev)
+{
+ struct hlist_head *h;
+
+ spin_lock_irq(&mdev->req_lock);
+
+ if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) {
+ spin_unlock_irq(&mdev->req_lock);
+ return;
+ }
+ /* paranoia code */
+ for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++)
+ if (h->first)
+ dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n",
+ (int)(h - mdev->ee_hash), h->first);
+ kfree(mdev->ee_hash);
+ mdev->ee_hash = NULL;
+ mdev->ee_hash_s = 0;
+
+ /* paranoia code */
+ for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++)
+ if (h->first)
+ dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n",
+ (int)(h - mdev->tl_hash), h->first);
+ kfree(mdev->tl_hash);
+ mdev->tl_hash = NULL;
+ mdev->tl_hash_s = 0;
+ spin_unlock_irq(&mdev->req_lock);
+}
+
static void drbd_disconnect(struct drbd_conf *mdev)
{
enum drbd_fencing_p fp;
@@ -3774,32 +3804,14 @@
spin_unlock_irq(&mdev->req_lock);
if (os.conn == C_DISCONNECTING) {
- struct hlist_head *h;
wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0);
- /* we must not free the tl_hash
- * while application io is still on the fly */
- wait_event(mdev->misc_wait, atomic_read(&mdev->ap_bio_cnt) == 0);
-
- spin_lock_irq(&mdev->req_lock);
- /* paranoia code */
- for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++)
- if (h->first)
- dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n",
- (int)(h - mdev->ee_hash), h->first);
- kfree(mdev->ee_hash);
- mdev->ee_hash = NULL;
- mdev->ee_hash_s = 0;
-
- /* paranoia code */
- for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++)
- if (h->first)
- dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n",
- (int)(h - mdev->tl_hash), h->first);
- kfree(mdev->tl_hash);
- mdev->tl_hash = NULL;
- mdev->tl_hash_s = 0;
- spin_unlock_irq(&mdev->req_lock);
+ if (!mdev->state.susp) {
+ /* we must not free the tl_hash
+ * while application io is still on the fly */
+ wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
+ drbd_free_tl_hash(mdev);
+ }
crypto_free_hash(mdev->cram_hmac_tfm);
mdev->cram_hmac_tfm = NULL;