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tcmu: split unmap_thread_fn

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Separate unmap_thread_fn to make it easier to read.

Note: this patch does not fix the bug where we might
miss a wake up call. The next patch will fix that.
This patch only separates the code into functions.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Mike Christie 2017-11-28 12:40:29 -06:00 committed by Nicholas Bellinger
parent bf99ec1332
commit 89ec9cfd3b
1 changed files with 70 additions and 50 deletions
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46
drivers/target/target_core_user.c
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@ -1973,22 +1973,13 @@ static struct target_backend_ops tcmu_ops = {
.tb_dev_attrib_attrs = NULL,
};
static int unmap_thread_fn(void *data)
static void find_free_blocks(void)
{
struct tcmu_dev *udev;
loff_t off;
uint32_t start, end, block;
while (!kthread_should_stop()) {
DEFINE_WAIT(__wait);
prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE);
schedule();
finish_wait(&unmap_wait, &__wait);
if (kthread_should_stop())
break;
mutex_lock(&root_udev_mutex);
list_for_each_entry(udev, &root_udev, node) {
mutex_lock(&udev->cmdr_lock);
@ -2028,18 +2019,47 @@ static int unmap_thread_fn(void *data)
tcmu_blocks_release(&udev->data_blocks, start, end);
mutex_unlock(&udev->cmdr_lock);
}
mutex_unlock(&root_udev_mutex);
}
static void run_cmdr_queues(void)
{
struct tcmu_dev *udev;
/*
* Try to wake up the udevs who are waiting
* for the global data pool.
* for the global data block pool.
*/
mutex_lock(&root_udev_mutex);
list_for_each_entry(udev, &root_udev, node) {
if (udev->waiting_global)
mutex_lock(&udev->cmdr_lock);
if (!udev->waiting_global) {
mutex_unlock(&udev->cmdr_lock);
break;
}
mutex_unlock(&udev->cmdr_lock);
wake_up(&udev->wait_cmdr);
}
mutex_unlock(&root_udev_mutex);
}
static int unmap_thread_fn(void *data)
{
while (!kthread_should_stop()) {
DEFINE_WAIT(__wait);
prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE);
schedule();
finish_wait(&unmap_wait, &__wait);
if (kthread_should_stop())
break;
find_free_blocks();
run_cmdr_queues();
}
return 0;
}