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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /drivers/block/drbd/drbd_main.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'drivers/block/drbd/drbd_main.c')
-rw-r--r--drivers/block/drbd/drbd_main.c74
1 files changed, 41 insertions, 33 deletions
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 74d97f4ba..5b43dfb79 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -117,6 +117,7 @@ module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0
*/
struct idr drbd_devices;
struct list_head drbd_resources;
+struct mutex resources_mutex;
struct kmem_cache *drbd_request_cache;
struct kmem_cache *drbd_ee_cache; /* peer requests */
@@ -1435,8 +1436,8 @@ static int we_should_drop_the_connection(struct drbd_connection *connection, str
/* long elapsed = (long)(jiffies - device->last_received); */
drop_it = connection->meta.socket == sock
- || !connection->asender.task
- || get_t_state(&connection->asender) != RUNNING
+ || !connection->ack_receiver.task
+ || get_t_state(&connection->ack_receiver) != RUNNING
|| connection->cstate < C_WF_REPORT_PARAMS;
if (drop_it)
@@ -1793,15 +1794,6 @@ int drbd_send(struct drbd_connection *connection, struct socket *sock,
drbd_update_congested(connection);
}
do {
- /* STRANGE
- * tcp_sendmsg does _not_ use its size parameter at all ?
- *
- * -EAGAIN on timeout, -EINTR on signal.
- */
-/* THINK
- * do we need to block DRBD_SIG if sock == &meta.socket ??
- * otherwise wake_asender() might interrupt some send_*Ack !
- */
rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
if (rv == -EAGAIN) {
if (we_should_drop_the_connection(connection, sock))
@@ -2000,7 +1992,7 @@ void drbd_device_cleanup(struct drbd_device *device)
drbd_bm_cleanup(device);
}
- drbd_free_ldev(device->ldev);
+ drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
clear_bit(AL_SUSPENDED, &device->flags);
@@ -2179,7 +2171,7 @@ void drbd_destroy_device(struct kref *kref)
if (device->this_bdev)
bdput(device->this_bdev);
- drbd_free_ldev(device->ldev);
+ drbd_backing_dev_free(device, device->ldev);
device->ldev = NULL;
drbd_release_all_peer_reqs(device);
@@ -2563,7 +2555,7 @@ int set_resource_options(struct drbd_resource *resource, struct res_opts *res_op
cpumask_copy(resource->cpu_mask, new_cpu_mask);
for_each_connection_rcu(connection, resource) {
connection->receiver.reset_cpu_mask = 1;
- connection->asender.reset_cpu_mask = 1;
+ connection->ack_receiver.reset_cpu_mask = 1;
connection->worker.reset_cpu_mask = 1;
}
}
@@ -2590,7 +2582,7 @@ struct drbd_resource *drbd_create_resource(const char *name)
kref_init(&resource->kref);
idr_init(&resource->devices);
INIT_LIST_HEAD(&resource->connections);
- resource->write_ordering = WO_bdev_flush;
+ resource->write_ordering = WO_BDEV_FLUSH;
list_add_tail_rcu(&resource->resources, &drbd_resources);
mutex_init(&resource->conf_update);
mutex_init(&resource->adm_mutex);
@@ -2652,8 +2644,8 @@ struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts)
connection->receiver.connection = connection;
drbd_thread_init(resource, &connection->worker, drbd_worker, "worker");
connection->worker.connection = connection;
- drbd_thread_init(resource, &connection->asender, drbd_asender, "asender");
- connection->asender.connection = connection;
+ drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv");
+ connection->ack_receiver.connection = connection;
kref_init(&connection->kref);
@@ -2702,8 +2694,8 @@ static int init_submitter(struct drbd_device *device)
{
/* opencoded create_singlethread_workqueue(),
* to be able to say "drbd%d", ..., minor */
- device->submit.wq = alloc_workqueue("drbd%u_submit",
- WQ_UNBOUND | WQ_MEM_RECLAIM, 1, device->minor);
+ device->submit.wq =
+ alloc_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor);
if (!device->submit.wq)
return -ENOMEM;
@@ -2820,6 +2812,7 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
goto out_idr_remove_from_resource;
}
kref_get(&connection->kref);
+ INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf);
}
if (init_submitter(device)) {
@@ -2923,7 +2916,7 @@ static int __init drbd_init(void)
drbd_proc = NULL; /* play safe for drbd_cleanup */
idr_init(&drbd_devices);
- rwlock_init(&global_state_lock);
+ mutex_init(&resources_mutex);
INIT_LIST_HEAD(&drbd_resources);
err = drbd_genl_register();
@@ -2971,18 +2964,6 @@ fail:
return err;
}
-void drbd_free_ldev(struct drbd_backing_dev *ldev)
-{
- if (ldev == NULL)
- return;
-
- blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
- blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
-
- kfree(ldev->disk_conf);
- kfree(ldev);
-}
-
static void drbd_free_one_sock(struct drbd_socket *ds)
{
struct socket *s;
@@ -3277,6 +3258,10 @@ int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev)
* and read it. */
bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx;
bdev->md.md_offset = drbd_md_ss(bdev);
+ /* Even for (flexible or indexed) external meta data,
+ * initially restrict us to the 4k superblock for now.
+ * Affects the paranoia out-of-range access check in drbd_md_sync_page_io(). */
+ bdev->md.md_size_sect = 8;
if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset, READ)) {
/* NOTE: can't do normal error processing here as this is
@@ -3578,7 +3563,9 @@ void drbd_queue_bitmap_io(struct drbd_device *device,
spin_lock_irq(&device->resource->req_lock);
set_bit(BITMAP_IO, &device->flags);
- if (atomic_read(&device->ap_bio_cnt) == 0) {
+ /* don't wait for pending application IO if the caller indicates that
+ * application IO does not conflict anyways. */
+ if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) {
if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags))
drbd_queue_work(&first_peer_device(device)->connection->sender_work,
&device->bm_io_work.w);
@@ -3746,6 +3733,27 @@ int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i)
return 0;
}
+void lock_all_resources(void)
+{
+ struct drbd_resource *resource;
+ int __maybe_unused i = 0;
+
+ mutex_lock(&resources_mutex);
+ local_irq_disable();
+ for_each_resource(resource, &drbd_resources)
+ spin_lock_nested(&resource->req_lock, i++);
+}
+
+void unlock_all_resources(void)
+{
+ struct drbd_resource *resource;
+
+ for_each_resource(resource, &drbd_resources)
+ spin_unlock(&resource->req_lock);
+ local_irq_enable();
+ mutex_unlock(&resources_mutex);
+}
+
#ifdef CONFIG_DRBD_FAULT_INJECTION
/* Fault insertion support including random number generator shamelessly
* stolen from kernel/rcutorture.c */