1 files changed, 0 insertions, 459 deletions
diff --git a/ANDROID_3.4.5/block/blk-ioc.c b/ANDROID_3.4.5/block/blk-ioc.c
deleted file mode 100644
index fb95dd2f..00000000
--- a/ANDROID_3.4.5/block/blk-ioc.c
+++ /dev/null
@@ -1,459 +0,0 @@
-/*
- * Functions related to io context handling
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/bio.h>
-#include <linux/blkdev.h>
-#include <linux/bootmem.h>	/* for max_pfn/max_low_pfn */
-#include <linux/slab.h>
-
-#include "blk.h"
-
-/*
- * For io context allocations
- */
-static struct kmem_cache *iocontext_cachep;
-
-/**
- * get_io_context - increment reference count to io_context
- * @ioc: io_context to get
- *
- * Increment reference count to @ioc.
- */
-void get_io_context(struct io_context *ioc)
-{
-	BUG_ON(atomic_long_read(&ioc->refcount) <= 0);
-	atomic_long_inc(&ioc->refcount);
-}
-EXPORT_SYMBOL(get_io_context);
-
-static void icq_free_icq_rcu(struct rcu_head *head)
-{
-	struct io_cq *icq = container_of(head, struct io_cq, __rcu_head);
-
-	kmem_cache_free(icq->__rcu_icq_cache, icq);
-}
-
-/* Exit an icq. Called with both ioc and q locked. */
-static void ioc_exit_icq(struct io_cq *icq)
-{
-	struct elevator_type *et = icq->q->elevator->type;
-
-	if (icq->flags & ICQ_EXITED)
-		return;
-
-	if (et->ops.elevator_exit_icq_fn)
-		et->ops.elevator_exit_icq_fn(icq);
-
-	icq->flags |= ICQ_EXITED;
-}
-
-/* Release an icq.  Called with both ioc and q locked. */
-static void ioc_destroy_icq(struct io_cq *icq)
-{
-	struct io_context *ioc = icq->ioc;
-	struct request_queue *q = icq->q;
-	struct elevator_type *et = q->elevator->type;
-
-	lockdep_assert_held(&ioc->lock);
-	lockdep_assert_held(q->queue_lock);
-
-	radix_tree_delete(&ioc->icq_tree, icq->q->id);
-	hlist_del_init(&icq->ioc_node);
-	list_del_init(&icq->q_node);
-
-	/*
-	 * Both setting lookup hint to and clearing it from @icq are done
-	 * under queue_lock.  If it's not pointing to @icq now, it never
-	 * will.  Hint assignment itself can race safely.
-	 */
-	if (rcu_dereference_raw(ioc->icq_hint) == icq)
-		rcu_assign_pointer(ioc->icq_hint, NULL);
-
-	ioc_exit_icq(icq);
-
-	/*
-	 * @icq->q might have gone away by the time RCU callback runs
-	 * making it impossible to determine icq_cache.  Record it in @icq.
-	 */
-	icq->__rcu_icq_cache = et->icq_cache;
-	call_rcu(&icq->__rcu_head, icq_free_icq_rcu);
-}
-
-/*
- * Slow path for ioc release in put_io_context().  Performs double-lock
- * dancing to unlink all icq's and then frees ioc.
- */
-static void ioc_release_fn(struct work_struct *work)
-{
-	struct io_context *ioc = container_of(work, struct io_context,
-					      release_work);
-	unsigned long flags;
-
-	/*
-	 * Exiting icq may call into put_io_context() through elevator
-	 * which will trigger lockdep warning.  The ioc's are guaranteed to
-	 * be different, use a different locking subclass here.  Use
-	 * irqsave variant as there's no spin_lock_irq_nested().
-	 */
-	spin_lock_irqsave_nested(&ioc->lock, flags, 1);
-
-	while (!hlist_empty(&ioc->icq_list)) {
-		struct io_cq *icq = hlist_entry(ioc->icq_list.first,
-						struct io_cq, ioc_node);
-		struct request_queue *q = icq->q;
-
-		if (spin_trylock(q->queue_lock)) {
-			ioc_destroy_icq(icq);
-			spin_unlock(q->queue_lock);
-		} else {
-			spin_unlock_irqrestore(&ioc->lock, flags);
-			cpu_relax();
-			spin_lock_irqsave_nested(&ioc->lock, flags, 1);
-		}
-	}
-
-	spin_unlock_irqrestore(&ioc->lock, flags);
-
-	kmem_cache_free(iocontext_cachep, ioc);
-}
-
-/**
- * put_io_context - put a reference of io_context
- * @ioc: io_context to put
- *
- * Decrement reference count of @ioc and release it if the count reaches
- * zero.
- */
-void put_io_context(struct io_context *ioc)
-{
-	unsigned long flags;
-	bool free_ioc = false;
-
-	if (ioc == NULL)
-		return;
-
-	BUG_ON(atomic_long_read(&ioc->refcount) <= 0);
-
-	/*
-	 * Releasing ioc requires reverse order double locking and we may
-	 * already be holding a queue_lock.  Do it asynchronously from wq.
-	 */
-	if (atomic_long_dec_and_test(&ioc->refcount)) {
-		spin_lock_irqsave(&ioc->lock, flags);
-		if (!hlist_empty(&ioc->icq_list))
-			schedule_work(&ioc->release_work);
-		else
-			free_ioc = true;
-		spin_unlock_irqrestore(&ioc->lock, flags);
-	}
-
-	if (free_ioc)
-		kmem_cache_free(iocontext_cachep, ioc);
-}
-EXPORT_SYMBOL(put_io_context);
-
-/* Called by the exiting task */
-void exit_io_context(struct task_struct *task)
-{
-	struct io_context *ioc;
-	struct io_cq *icq;
-	struct hlist_node *n;
-	unsigned long flags;
-
-	task_lock(task);
-	ioc = task->io_context;
-	task->io_context = NULL;
-	task_unlock(task);
-
-	if (!atomic_dec_and_test(&ioc->nr_tasks)) {
-		put_io_context(ioc);
-		return;
-	}
-
-	/*
-	 * Need ioc lock to walk icq_list and q lock to exit icq.  Perform
-	 * reverse double locking.  Read comment in ioc_release_fn() for
-	 * explanation on the nested locking annotation.
-	 */
-retry:
-	spin_lock_irqsave_nested(&ioc->lock, flags, 1);
-	hlist_for_each_entry(icq, n, &ioc->icq_list, ioc_node) {
-		if (icq->flags & ICQ_EXITED)
-			continue;
-		if (spin_trylock(icq->q->queue_lock)) {
-			ioc_exit_icq(icq);
-			spin_unlock(icq->q->queue_lock);
-		} else {
-			spin_unlock_irqrestore(&ioc->lock, flags);
-			cpu_relax();
-			goto retry;
-		}
-	}
-	spin_unlock_irqrestore(&ioc->lock, flags);
-
-	put_io_context(ioc);
-}
-
-/**
- * ioc_clear_queue - break any ioc association with the specified queue
- * @q: request_queue being cleared
- *
- * Walk @q->icq_list and exit all io_cq's.  Must be called with @q locked.
- */
-void ioc_clear_queue(struct request_queue *q)
-{
-	lockdep_assert_held(q->queue_lock);
-
-	while (!list_empty(&q->icq_list)) {
-		struct io_cq *icq = list_entry(q->icq_list.next,
-					       struct io_cq, q_node);
-		struct io_context *ioc = icq->ioc;
-
-		spin_lock(&ioc->lock);
-		ioc_destroy_icq(icq);
-		spin_unlock(&ioc->lock);
-	}
-}
-
-void create_io_context_slowpath(struct task_struct *task, gfp_t gfp_flags,
-				int node)
-{
-	struct io_context *ioc;
-
-	ioc = kmem_cache_alloc_node(iocontext_cachep, gfp_flags | __GFP_ZERO,
-				    node);
-	if (unlikely(!ioc))
-		return;
-
-	/* initialize */
-	atomic_long_set(&ioc->refcount, 1);
-	atomic_set(&ioc->nr_tasks, 1);
-	spin_lock_init(&ioc->lock);
-	INIT_RADIX_TREE(&ioc->icq_tree, GFP_ATOMIC | __GFP_HIGH);
-	INIT_HLIST_HEAD(&ioc->icq_list);
-	INIT_WORK(&ioc->release_work, ioc_release_fn);
-
-	/*
-	 * Try to install.  ioc shouldn't be installed if someone else
-	 * already did or @task, which isn't %current, is exiting.  Note
-	 * that we need to allow ioc creation on exiting %current as exit
-	 * path may issue IOs from e.g. exit_files().  The exit path is
-	 * responsible for not issuing IO after exit_io_context().
-	 */
-	task_lock(task);
-	if (!task->io_context &&
-	    (task == current || !(task->flags & PF_EXITING)))
-		task->io_context = ioc;
-	else
-		kmem_cache_free(iocontext_cachep, ioc);
-	task_unlock(task);
-}
-
-/**
- * get_task_io_context - get io_context of a task
- * @task: task of interest
- * @gfp_flags: allocation flags, used if allocation is necessary
- * @node: allocation node, used if allocation is necessary
- *
- * Return io_context of @task.  If it doesn't exist, it is created with
- * @gfp_flags and @node.  The returned io_context has its reference count
- * incremented.
- *
- * This function always goes through task_lock() and it's better to use
- * %current->io_context + get_io_context() for %current.
- */
-struct io_context *get_task_io_context(struct task_struct *task,
-				       gfp_t gfp_flags, int node)
-{
-	struct io_context *ioc;
-
-	might_sleep_if(gfp_flags & __GFP_WAIT);
-
-	do {
-		task_lock(task);
-		ioc = task->io_context;
-		if (likely(ioc)) {
-			get_io_context(ioc);
-			task_unlock(task);
-			return ioc;
-		}
-		task_unlock(task);
-	} while (create_io_context(task, gfp_flags, node));
-
-	return NULL;
-}
-EXPORT_SYMBOL(get_task_io_context);
-
-/**
- * ioc_lookup_icq - lookup io_cq from ioc
- * @ioc: the associated io_context
- * @q: the associated request_queue
- *
- * Look up io_cq associated with @ioc - @q pair from @ioc.  Must be called
- * with @q->queue_lock held.
- */
-struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q)
-{
-	struct io_cq *icq;
-
-	lockdep_assert_held(q->queue_lock);
-
-	/*
-	 * icq's are indexed from @ioc using radix tree and hint pointer,
-	 * both of which are protected with RCU.  All removals are done
-	 * holding both q and ioc locks, and we're holding q lock - if we
-	 * find a icq which points to us, it's guaranteed to be valid.
-	 */
-	rcu_read_lock();
-	icq = rcu_dereference(ioc->icq_hint);
-	if (icq && icq->q == q)
-		goto out;
-
-	icq = radix_tree_lookup(&ioc->icq_tree, q->id);
-	if (icq && icq->q == q)
-		rcu_assign_pointer(ioc->icq_hint, icq);	/* allowed to race */
-	else
-		icq = NULL;
-out:
-	rcu_read_unlock();
-	return icq;
-}
-EXPORT_SYMBOL(ioc_lookup_icq);
-
-/**
- * ioc_create_icq - create and link io_cq
- * @q: request_queue of interest
- * @gfp_mask: allocation mask
- *
- * Make sure io_cq linking %current->io_context and @q exists.  If either
- * io_context and/or icq don't exist, they will be created using @gfp_mask.
- *
- * The caller is responsible for ensuring @ioc won't go away and @q is
- * alive and will stay alive until this function returns.
- */
-struct io_cq *ioc_create_icq(struct request_queue *q, gfp_t gfp_mask)
-{
-	struct elevator_type *et = q->elevator->type;
-	struct io_context *ioc;
-	struct io_cq *icq;
-
-	/* allocate stuff */
-	ioc = create_io_context(current, gfp_mask, q->node);
-	if (!ioc)
-		return NULL;
-
-	icq = kmem_cache_alloc_node(et->icq_cache, gfp_mask | __GFP_ZERO,
-				    q->node);
-	if (!icq)
-		return NULL;
-
-	if (radix_tree_preload(gfp_mask) < 0) {
-		kmem_cache_free(et->icq_cache, icq);
-		return NULL;
-	}
-
-	icq->ioc = ioc;
-	icq->q = q;
-	INIT_LIST_HEAD(&icq->q_node);
-	INIT_HLIST_NODE(&icq->ioc_node);
-
-	/* lock both q and ioc and try to link @icq */
-	spin_lock_irq(q->queue_lock);
-	spin_lock(&ioc->lock);
-
-	if (likely(!radix_tree_insert(&ioc->icq_tree, q->id, icq))) {
-		hlist_add_head(&icq->ioc_node, &ioc->icq_list);
-		list_add(&icq->q_node, &q->icq_list);
-		if (et->ops.elevator_init_icq_fn)
-			et->ops.elevator_init_icq_fn(icq);
-	} else {
-		kmem_cache_free(et->icq_cache, icq);
-		icq = ioc_lookup_icq(ioc, q);
-		if (!icq)
-			printk(KERN_ERR "cfq: icq link failed!\n");
-	}
-
-	spin_unlock(&ioc->lock);
-	spin_unlock_irq(q->queue_lock);
-	radix_tree_preload_end();
-	return icq;
-}
-
-void ioc_set_icq_flags(struct io_context *ioc, unsigned int flags)
-{
-	struct io_cq *icq;
-	struct hlist_node *n;
-
-	hlist_for_each_entry(icq, n, &ioc->icq_list, ioc_node)
-		icq->flags |= flags;
-}
-
-/**
- * ioc_ioprio_changed - notify ioprio change
- * @ioc: io_context of interest
- * @ioprio: new ioprio
- *
- * @ioc's ioprio has changed to @ioprio.  Set %ICQ_IOPRIO_CHANGED for all
- * icq's.  iosched is responsible for checking the bit and applying it on
- * request issue path.
- */
-void ioc_ioprio_changed(struct io_context *ioc, int ioprio)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&ioc->lock, flags);
-	ioc->ioprio = ioprio;
-	ioc_set_icq_flags(ioc, ICQ_IOPRIO_CHANGED);
-	spin_unlock_irqrestore(&ioc->lock, flags);
-}
-
-/**
- * ioc_cgroup_changed - notify cgroup change
- * @ioc: io_context of interest
- *
- * @ioc's cgroup has changed.  Set %ICQ_CGROUP_CHANGED for all icq's.
- * iosched is responsible for checking the bit and applying it on request
- * issue path.
- */
-void ioc_cgroup_changed(struct io_context *ioc)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&ioc->lock, flags);
-	ioc_set_icq_flags(ioc, ICQ_CGROUP_CHANGED);
-	spin_unlock_irqrestore(&ioc->lock, flags);
-}
-EXPORT_SYMBOL(ioc_cgroup_changed);
-
-/**
- * icq_get_changed - fetch and clear icq changed mask
- * @icq: icq of interest
- *
- * Fetch and clear ICQ_*_CHANGED bits from @icq.  Grabs and releases
- * @icq->ioc->lock.
- */
-unsigned icq_get_changed(struct io_cq *icq)
-{
-	unsigned int changed = 0;
-	unsigned long flags;
-
-	if (unlikely(icq->flags & ICQ_CHANGED_MASK)) {
-		spin_lock_irqsave(&icq->ioc->lock, flags);
-		changed = icq->flags & ICQ_CHANGED_MASK;
-		icq->flags &= ~ICQ_CHANGED_MASK;
-		spin_unlock_irqrestore(&icq->ioc->lock, flags);
-	}
-	return changed;
-}
-EXPORT_SYMBOL(icq_get_changed);
-
-static int __init blk_ioc_init(void)
-{
-	iocontext_cachep = kmem_cache_create("blkdev_ioc",
-			sizeof(struct io_context), 0, SLAB_PANIC, NULL);
-	return 0;
-}
-subsys_initcall(blk_ioc_init);