ioprio: move io priority from task_struct to io_context

This is where it belongs and then it doesn't take up space for a
process that doesn't do IO.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 21 insertions, 9 deletions

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 3d0422f48453..b9bb02e845cd 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3904,6 +3904,26 @@ void exit_io_context(void)
         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.
@@ -3921,16 +3941,8 @@ static struct io_context *current_io_context(gfp_t gfp_flags, int node)
         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;