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drbd: Iterate over all connections 

in drbd_adm_down(), drbd_create_device() and drbd_set_role()

Signed-off-by: Andreas Gruenbacher <agruen@linbit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
This commit is contained in:
Andreas Gruenbacher 2011-07-06 15:03:31 +02:00 committed by Philipp Reisner
parent 270eb5c972
commit b6f85ef953
2 changed files with 70 additions and 53 deletions
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55
drivers/block/drbd/drbd_main.c
View File

@ -2661,9 +2661,9 @@ static int init_submitter(struct drbd_device *device)
enum drbd_ret_code drbd_create_device(struct drbd_resource *resource, unsigned int minor, int vnr)
{
struct drbd_connection *connection = first_connection(resource);
struct drbd_connection *connection;
struct drbd_device *device;
struct drbd_peer_device *peer_device;
struct drbd_peer_device *peer_device, *tmp_peer_device;
struct gendisk *disk;
struct request_queue *q;
int id;
@ -2679,18 +2679,8 @@ enum drbd_ret_code drbd_create_device(struct drbd_resource *resource, unsigned i
return ERR_NOMEM;
kref_init(&device->kref);
peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL);
if (!peer_device)
goto out_no_peer_device;
INIT_LIST_HEAD(&device->peer_devices);
list_add(&peer_device->peer_devices, &device->peer_devices);
kref_get(&resource->kref);
device->resource = resource;
kref_get(&connection->kref);
peer_device->connection = connection;
peer_device->device = device;
device->minor = minor;
device->vnr = vnr;
@ -2761,15 +2751,27 @@ enum drbd_ret_code drbd_create_device(struct drbd_resource *resource, unsigned i
}
kref_get(&device->kref);
id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL);
if (id < 0) {
if (id == -ENOSPC) {
err = ERR_INVALID_REQUEST;
drbd_msg_put_info("requested volume exists already");
INIT_LIST_HEAD(&device->peer_devices);
for_each_connection(connection, resource) {
peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL);
if (!peer_device)
goto out_idr_remove_from_resource;
peer_device->connection = connection;
peer_device->device = device;
list_add(&peer_device->peer_devices, &device->peer_devices);
kref_get(&device->kref);
id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL);
if (id < 0) {
if (id == -ENOSPC) {
err = ERR_INVALID_REQUEST;
drbd_msg_put_info("requested volume exists already");
}
goto out_idr_remove_from_resource;
}
goto out_idr_remove_from_resource;
kref_get(&connection->kref);
}
kref_get(&device->kref);
if (init_submitter(device)) {
err = ERR_NOMEM;
@ -2780,7 +2782,7 @@ enum drbd_ret_code drbd_create_device(struct drbd_resource *resource, unsigned i
add_disk(disk);
/* inherit the connection state */
device->state.conn = connection->cstate;
device->state.conn = first_connection(resource)->cstate;
if (device->state.conn == C_WF_REPORT_PARAMS)
drbd_connected(device);
@ -2789,6 +2791,17 @@ enum drbd_ret_code drbd_create_device(struct drbd_resource *resource, unsigned i
out_idr_remove_vol:
idr_remove(&connection->peer_devices, vnr);
out_idr_remove_from_resource:
for_each_connection(connection, resource) {
peer_device = idr_find(&connection->peer_devices, vnr);
if (peer_device) {
idr_remove(&connection->peer_devices, vnr);
kref_put(&connection->kref, drbd_destroy_connection);
}
}
for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
list_del(&peer_device->peer_devices);
kfree(peer_device);
}
idr_remove(&resource->devices, vnr);
out_idr_remove_minor:
idr_remove(&drbd_devices, minor);
@ -2802,9 +2815,7 @@ enum drbd_ret_code drbd_create_device(struct drbd_resource *resource, unsigned i
out_no_disk:
blk_cleanup_queue(q);
out_no_q:
kref_put(&connection->kref, drbd_destroy_connection);
kref_put(&resource->kref, drbd_destroy_resource);
out_no_peer_device:
kfree(device);
return err;
}

68
drivers/block/drbd/drbd_nl.c
View File

@ -560,8 +560,16 @@ drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
int forced = 0;
union drbd_state mask, val;
if (new_role == R_PRIMARY)
request_ping(first_peer_device(device)->connection); /* Detect a dead peer ASAP */
if (new_role == R_PRIMARY) {
struct drbd_connection *connection;
/* Detect dead peers as soon as possible. */
rcu_read_lock();
for_each_connection(connection, device->resource)
request_ping(connection);
rcu_read_unlock();
}
mutex_lock(device->state_mutex);
@ -3387,8 +3395,10 @@ int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info)
int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_resource *resource;
struct drbd_connection *connection;
struct drbd_device *device;
int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
struct drbd_peer_device *peer_device;
unsigned i;
retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_RESOURCE);
@ -3397,24 +3407,29 @@ int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
if (retcode != NO_ERROR)
goto out;
resource = adm_ctx.resource;
/* demote */
idr_for_each_entry(&adm_ctx.connection->peer_devices, peer_device, i) {
retcode = drbd_set_role(peer_device->device, R_SECONDARY, 0);
for_each_connection(connection, resource) {
struct drbd_peer_device *peer_device;
idr_for_each_entry(&connection->peer_devices, peer_device, i) {
retcode = drbd_set_role(peer_device->device, R_SECONDARY, 0);
if (retcode < SS_SUCCESS) {
drbd_msg_put_info("failed to demote");
goto out;
}
}
retcode = conn_try_disconnect(connection, 0);
if (retcode < SS_SUCCESS) {
drbd_msg_put_info("failed to demote");
drbd_msg_put_info("failed to disconnect");
goto out;
}
}
retcode = conn_try_disconnect(adm_ctx.connection, 0);
if (retcode < SS_SUCCESS) {
drbd_msg_put_info("failed to disconnect");
goto out;
}
/* detach */
idr_for_each_entry(&adm_ctx.connection->peer_devices, peer_device, i) {
retcode = adm_detach(peer_device->device, 0);
idr_for_each_entry(&resource->devices, device, i) {
retcode = adm_detach(device, 0);
if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
drbd_msg_put_info("failed to detach");
goto out;
@ -3424,13 +3439,14 @@ int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
/* If we reach this, all volumes (of this connection) are Secondary,
* Disconnected, Diskless, aka Unconfigured. Make sure all threads have
* actually stopped, state handling only does drbd_thread_stop_nowait(). */
drbd_thread_stop(&adm_ctx.connection->worker);
for_each_connection(connection, resource)
drbd_thread_stop(&connection->worker);
/* Now, nothing can fail anymore */
/* delete volumes */
idr_for_each_entry(&adm_ctx.connection->peer_devices, peer_device, i) {
retcode = adm_del_minor(peer_device->device);
idr_for_each_entry(&resource->devices, device, i) {
retcode = adm_del_minor(device);
if (retcode != NO_ERROR) {
/* "can not happen" */
drbd_msg_put_info("failed to delete volume");
@ -3438,21 +3454,11 @@ int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
}
}
/* delete connection */
if (conn_lowest_minor(adm_ctx.connection) < 0) {
struct drbd_resource *resource = adm_ctx.connection->resource;
list_del_rcu(&resource->resources);
synchronize_rcu();
drbd_free_resource(resource);
retcode = NO_ERROR;
list_del_rcu(&resource->resources);
synchronize_rcu();
drbd_free_resource(resource);
retcode = NO_ERROR;
} else {
/* "can not happen" */
retcode = ERR_RES_IN_USE;
drbd_msg_put_info("failed to delete connection");
}
goto out;
out:
drbd_adm_finish(info, retcode);
return 0;