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Subject[PATCH 4/9] blkio-cgroup-v9: Refactoring io-context initialization
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This patch refactors io_context initialization.

Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>
Signed-off-by: Ryo Tsuruta <ryov@valinux.co.jp>

---
block/blk-ioc.c | 30 +++++++++++++++++-------------
include/linux/iocontext.h | 1 +
2 files changed, 18 insertions(+), 13 deletions(-)
Index: linux-2.6.31-rc3/block/blk-ioc.c
===================================================================
--- linux-2.6.31-rc3.orig/block/blk-ioc.c
+++ linux-2.6.31-rc3/block/blk-ioc.c
@@ -84,24 +84,28 @@ void exit_io_context(void)
}
}

+void init_io_context(struct io_context *ioc)
+{
+ atomic_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-rc3/include/linux/iocontext.h
===================================================================
--- linux-2.6.31-rc3.orig/include/linux/iocontext.h
+++ linux-2.6.31-rc3/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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