EXPORT_SYMBOL(blk_queue_dma_alignment);
+/**
+ * blk_queue_update_dma_alignment - update dma length and memory alignment
+ * @q: the request queue for the device
+ * @mask: alignment mask
+ *
+ * description:
+ * update required memory and length aligment for direct dma transactions.
+ * If the requested alignment is larger than the current alignment, then
+ * the current queue alignment is updated to the new value, otherwise it
+ * is left alone. The design of this is to allow multiple objects
+ * (driver, device, transport etc) to set their respective
+ * alignments without having them interfere.
+ *
+ **/
+void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
+{
+ BUG_ON(mask > PAGE_SIZE);
+
+ if (mask > q->dma_alignment)
+ q->dma_alignment = mask;
+}
+
+EXPORT_SYMBOL(blk_queue_update_dma_alignment);
+
/**
* blk_queue_find_tag - find a request by its tag and queue
* @q: The request queue for the device
init_timer(&q->unplug_timer);
- kobject_set_name(&q->kobj, "%s", "queue");
- q->kobj.ktype = &queue_ktype;
- kobject_init(&q->kobj);
+ kobject_init(&q->kobj, &queue_ktype);
mutex_init(&q->sysfs_lock);
put_io_context(ioc);
}
+struct io_context *alloc_io_context(gfp_t gfp_flags, int node)
+{
+ struct io_context *ret;
+
+ ret = kmem_cache_alloc_node(iocontext_cachep, gfp_flags, node);
+ if (ret) {
+ atomic_set(&ret->refcount, 1);
+ ret->task = current;
+ ret->ioprio_changed = 0;
+ ret->ioprio = 0;
+ ret->last_waited = jiffies; /* doesn't matter... */
+ ret->nr_batch_requests = 0; /* because this is 0 */
+ ret->aic = NULL;
+ ret->cic_root.rb_node = NULL;
+ ret->ioc_data = NULL;
+ }
+
+ return ret;
+}
+
/*
* If the current task has no IO context then create one and initialise it.
* Otherwise, return its existing IO context.
if (likely(ret))
return ret;
- ret = kmem_cache_alloc_node(iocontext_cachep, gfp_flags, node);
+ ret = alloc_io_context(gfp_flags, node);
if (ret) {
- atomic_set(&ret->refcount, 1);
- ret->task = current;
- ret->ioprio_changed = 0;
- ret->last_waited = jiffies; /* doesn't matter... */
- ret->nr_batch_requests = 0; /* because this is 0 */
- ret->aic = NULL;
- ret->cic_root.rb_node = NULL;
- ret->ioc_data = NULL;
/* make sure set_task_ioprio() sees the settings above */
smp_wmb();
tsk->io_context = ret;
if (!q || !q->request_fn)
return -ENXIO;
- q->kobj.parent = kobject_get(&disk->kobj);
-
- ret = kobject_add(&q->kobj);
+ ret = kobject_add(&q->kobj, kobject_get(&disk->dev.kobj),
+ "%s", "queue");
if (ret < 0)
return ret;
kobject_uevent(&q->kobj, KOBJ_REMOVE);
kobject_del(&q->kobj);
- kobject_put(&disk->kobj);
+ kobject_put(&disk->dev.kobj);
}
}