From: Philipp Reisner Date: Thu, 24 Jun 2010 12:34:40 +0000 (+0200) Subject: drbd: Do not try to free tl_hash in drbd_disconnect() when IO is suspended X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f70b3511599c49a3dc20ae349d6cdc5af47659df;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Lars Ellenberg --- diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index aa9bb213fe70..f84ffb17a7e5 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1493,6 +1493,7 @@ extern void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, 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 9fe9bdd9e33d..8d14635e7faf 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1409,6 +1409,10 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, (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 dc0a9acbfdf1..6c08e637e25c 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1391,6 +1391,7 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, } } + drbd_flush_workqueue(mdev); spin_lock_irq(&mdev->req_lock); if (mdev->net_conf != NULL) { retcode = ERR_NET_CONFIGURED; @@ -1429,10 +1430,9 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, 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 22d74d79ba42..5e49ee75d3c9 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -3691,6 +3691,36 @@ void drbd_flush_workqueue(struct drbd_conf *mdev) 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 @@ static void drbd_disconnect(struct drbd_conf *mdev) 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;