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drbd: Add drbd_thread->resource and make drbd_thread->connection optional 

In the drbd_thread "infrastructure" functions, only use the resource instead of
the connection.  Make the connection field of drbd_thread optional.  This will
allow to introduce threads which are not associated with a connection.

Signed-off-by: Andreas Gruenbacher <agruen@linbit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
This commit is contained in:
Andreas Gruenbacher 2011-07-21 13:45:21 +02:00 committed by Philipp Reisner
parent 6780139c0a
commit 2457b6d5ee
2 changed files with 31 additions and 19 deletions
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1
drivers/block/drbd/drbd_int.h
View File

@ -263,6 +263,7 @@ struct drbd_thread {
struct completion stop;
enum drbd_thread_state t_state;
int (*function) (struct drbd_thread *);
struct drbd_resource *resource;
struct drbd_connection *connection;
int reset_cpu_mask;
const char *name;

49
drivers/block/drbd/drbd_main.c
View File

@ -322,13 +322,13 @@ void tl_abort_disk_io(struct drbd_device *device)
static int drbd_thread_setup(void *arg)
{
struct drbd_thread *thi = (struct drbd_thread *) arg;
struct drbd_connection *connection = thi->connection;
struct drbd_resource *resource = thi->resource;
unsigned long flags;
int retval;
snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s",
thi->name[0],
thi->connection->resource->name);
resource->name);
restart:
retval = thi->function(thi);
@ -346,7 +346,7 @@ static int drbd_thread_setup(void *arg)
*/
if (thi->t_state == RESTARTING) {
drbd_info(connection, "Restarting %s thread\n", thi->name);
drbd_info(resource, "Restarting %s thread\n", thi->name);
thi->t_state = RUNNING;
spin_unlock_irqrestore(&thi->t_lock, flags);
goto restart;
@ -358,29 +358,32 @@ static int drbd_thread_setup(void *arg)
complete_all(&thi->stop);
spin_unlock_irqrestore(&thi->t_lock, flags);
drbd_info(connection, "Terminating %s\n", current->comm);
drbd_info(resource, "Terminating %s\n", current->comm);
/* Release mod reference taken when thread was started */
kref_put(&connection->kref, drbd_destroy_connection);
if (thi->connection)
kref_put(&thi->connection->kref, drbd_destroy_connection);
kref_put(&resource->kref, drbd_destroy_resource);
module_put(THIS_MODULE);
return retval;
}
static void drbd_thread_init(struct drbd_connection *connection, struct drbd_thread *thi,
static void drbd_thread_init(struct drbd_resource *resource, struct drbd_thread *thi,
int (*func) (struct drbd_thread *), const char *name)
{
spin_lock_init(&thi->t_lock);
thi->task = NULL;
thi->t_state = NONE;
thi->function = func;
thi->connection = connection;
thi->resource = resource;
thi->connection = NULL;
thi->name = name;
}
int drbd_thread_start(struct drbd_thread *thi)
{
struct drbd_connection *connection = thi->connection;
struct drbd_resource *resource = thi->resource;
struct task_struct *nt;
unsigned long flags;
@ -390,17 +393,19 @@ int drbd_thread_start(struct drbd_thread *thi)
switch (thi->t_state) {
case NONE:
drbd_info(connection, "Starting %s thread (from %s [%d])\n",
drbd_info(resource, "Starting %s thread (from %s [%d])\n",
thi->name, current->comm, current->pid);
/* Get ref on module for thread - this is released when thread exits */
if (!try_module_get(THIS_MODULE)) {
drbd_err(connection, "Failed to get module reference in drbd_thread_start\n");
drbd_err(resource, "Failed to get module reference in drbd_thread_start\n");
spin_unlock_irqrestore(&thi->t_lock, flags);
return false;
}
kref_get(&thi->connection->kref);
kref_get(&resource->kref);
if (thi->connection)
kref_get(&thi->connection->kref);
init_completion(&thi->stop);
thi->reset_cpu_mask = 1;
@ -409,12 +414,14 @@ int drbd_thread_start(struct drbd_thread *thi)
flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
nt = kthread_create(drbd_thread_setup, (void *) thi,
"drbd_%c_%s", thi->name[0], thi->connection->resource->name);
"drbd_%c_%s", thi->name[0], thi->resource->name);
if (IS_ERR(nt)) {
drbd_err(connection, "Couldn't start thread\n");
drbd_err(resource, "Couldn't start thread\n");
kref_put(&connection->kref, drbd_destroy_connection);
if (thi->connection)
kref_put(&thi->connection->kref, drbd_destroy_connection);
kref_put(&resource->kref, drbd_destroy_resource);
module_put(THIS_MODULE);
return false;
}
@ -426,7 +433,7 @@ int drbd_thread_start(struct drbd_thread *thi)
break;
case EXITING:
thi->t_state = RESTARTING;
drbd_info(connection, "Restarting %s thread (from %s [%d])\n",
drbd_info(resource, "Restarting %s thread (from %s [%d])\n",
thi->name, current->comm, current->pid);
/* fall through */
case RUNNING:
@ -536,12 +543,13 @@ static void drbd_calc_cpu_mask(cpumask_var_t *cpu_mask)
*/
void drbd_thread_current_set_cpu(struct drbd_thread *thi)
{
struct drbd_resource *resource = thi->resource;
struct task_struct *p = current;
if (!thi->reset_cpu_mask)
return;
thi->reset_cpu_mask = 0;
set_cpus_allowed_ptr(p, thi->connection->resource->cpu_mask);
set_cpus_allowed_ptr(p, resource->cpu_mask);
}
#else
#define drbd_calc_cpu_mask(A) ({})
@ -2616,9 +2624,12 @@ struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts)
mutex_init(&connection->data.mutex);
mutex_init(&connection->meta.mutex);
drbd_thread_init(connection, &connection->receiver, drbd_receiver, "receiver");
drbd_thread_init(connection, &connection->worker, drbd_worker, "worker");
drbd_thread_init(connection, &connection->asender, drbd_asender, "asender");
drbd_thread_init(resource, &connection->receiver, drbd_receiver, "receiver");
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;
kref_init(&connection->kref);