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drbd: Do not try to free tl_hash in drbd_disconnect() when IO is suspended

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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>
This commit is contained in:
Philipp Reisner 2010-06-24 14:34:40 +02:00
parent 8f488156c0
commit f70b351159
4 changed files with 43 additions and 26 deletions
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1
drivers/block/drbd/drbd_int.h
View File

@ -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. */

4
drivers/block/drbd/drbd_main.c
View File

@ -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);

4
drivers/block/drbd/drbd_nl.c
View File

@ -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);

60
drivers/block/drbd/drbd_receiver.c
View File

@ -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;