[Xen-devel] [PATCH 3/8] blkio-cgroup-v11: Refactoring io-context initialization

[Ryo Tsuruta <ryov@xxxxxxxxxxxxx>]

This patch refactors io_context initialization.

Signed-off-by: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>
Signed-off-by: Ryo Tsuruta <ryov@xxxxxxxxxxxxx>

---
 block/blk-ioc.c           |   30 +++++++++++++++++-------------
 include/linux/iocontext.h |    1 +
 2 files changed, 18 insertions(+), 13 deletions(-)

Index: linux-2.6.31-rc7/block/blk-ioc.c
===================================================================
--- linux-2.6.31-rc7.orig/block/blk-ioc.c
+++ linux-2.6.31-rc7/block/blk-ioc.c
@@ -84,24 +84,28 @@ void exit_io_context(void)
        }
 }
 
+void init_io_context(struct io_context *ioc)
+{
+       atomic_long_set(&ioc->refcount, 1);
+       atomic_set(&ioc->nr_tasks, 1);
+       spin_lock_init(&ioc->lock);
+       ioc->ioprio_changed = 0;
+       ioc->ioprio = 0;
+       ioc->last_waited = jiffies; /* doesn't matter... */
+       ioc->nr_batch_requests = 0; /* because this is 0 */
+       ioc->aic = NULL;
+       INIT_RADIX_TREE(&ioc->radix_root, GFP_ATOMIC | __GFP_HIGH);
+       INIT_HLIST_HEAD(&ioc->cic_list);
+       ioc->ioc_data = NULL;
+}
+
 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_long_set(&ret->refcount, 1);
-               atomic_set(&ret->nr_tasks, 1);
-               spin_lock_init(&ret->lock);
-               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;
-               INIT_RADIX_TREE(&ret->radix_root, GFP_ATOMIC | __GFP_HIGH);
-               INIT_HLIST_HEAD(&ret->cic_list);
-               ret->ioc_data = NULL;
-       }
+       if (ret)
+               init_io_context(ret);
 
        return ret;
 }
Index: linux-2.6.31-rc7/include/linux/iocontext.h
===================================================================
--- linux-2.6.31-rc7.orig/include/linux/iocontext.h
+++ linux-2.6.31-rc7/include/linux/iocontext.h
@@ -104,6 +104,7 @@ int put_io_context(struct io_context *io
 void exit_io_context(void);
 struct io_context *get_io_context(gfp_t gfp_flags, int node);
 struct io_context *alloc_io_context(gfp_t gfp_flags, int node);
+void init_io_context(struct io_context *ioc);
 void copy_io_context(struct io_context **pdst, struct io_context **psrc);
 #else
 static inline void exit_io_context(void)

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