block: remove unused copy_io_context()
[linux-3.10.git] / block / blk-ioc.c
index d4ed600..3c7a339 100644 (file)
@@ -7,6 +7,7 @@
 #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"
 
@@ -39,8 +40,6 @@ int put_io_context(struct io_context *ioc)
 
        if (atomic_long_dec_and_test(&ioc->refcount)) {
                rcu_read_lock();
-               if (ioc->aic && ioc->aic->dtor)
-                       ioc->aic->dtor(ioc->aic);
                cfq_dtor(ioc);
                rcu_read_unlock();
 
@@ -66,22 +65,20 @@ static void cfq_exit(struct io_context *ioc)
 }
 
 /* Called by the exitting task */
-void exit_io_context(void)
+void exit_io_context(struct task_struct *task)
 {
        struct io_context *ioc;
 
-       task_lock(current);
-       ioc = current->io_context;
-       current->io_context = NULL;
-       task_unlock(current);
+       task_lock(task);
+       ioc = task->io_context;
+       task->io_context = NULL;
+       task_unlock(task);
 
        if (atomic_dec_and_test(&ioc->nr_tasks)) {
-               if (ioc->aic && ioc->aic->exit)
-                       ioc->aic->exit(ioc->aic);
                cfq_exit(ioc);
 
-               put_io_context(ioc);
        }
+       put_io_context(ioc);
 }
 
 struct io_context *alloc_io_context(gfp_t gfp_flags, int node)
@@ -95,9 +92,8 @@ struct io_context *alloc_io_context(gfp_t gfp_flags, int node)
                spin_lock_init(&ret->lock);
                ret->ioprio_changed = 0;
                ret->ioprio = 0;
-               ret->last_waited = jiffies; /* doesn't matter... */
+               ret->last_waited = 0; /* doesn't matter... */
                ret->nr_batch_requests = 0; /* because this is 0 */
-               ret->aic = NULL;
                INIT_RADIX_TREE(&ret->radix_root, GFP_ATOMIC | __GFP_HIGH);
                INIT_HLIST_HEAD(&ret->cic_list);
                ret->ioc_data = NULL;
@@ -157,20 +153,6 @@ struct io_context *get_io_context(gfp_t gfp_flags, int node)
 }
 EXPORT_SYMBOL(get_io_context);
 
-void copy_io_context(struct io_context **pdst, struct io_context **psrc)
-{
-       struct io_context *src = *psrc;
-       struct io_context *dst = *pdst;
-
-       if (src) {
-               BUG_ON(atomic_long_read(&src->refcount) == 0);
-               atomic_long_inc(&src->refcount);
-               put_io_context(dst);
-               *pdst = src;
-       }
-}
-EXPORT_SYMBOL(copy_io_context);
-
 static int __init blk_ioc_init(void)
 {
        iocontext_cachep = kmem_cache_create("blkdev_ioc",