block: prevent possible io_context->refcount overflow

[pandora-kernel.git] / block / cfq-iosched.c

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index a55a9bd..ef2f72d 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -349,8 +349,8 @@ cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2)
        else if (rq_is_meta(rq2) && !rq_is_meta(rq1))
                return rq2;
 
-       s1 = rq1->sector;
-       s2 = rq2->sector;
+       s1 = blk_rq_pos(rq1);
+       s2 = blk_rq_pos(rq2);
 
        last = cfqd->last_position;
 
@@ -579,9 +579,9 @@ cfq_prio_tree_lookup(struct cfq_data *cfqd, struct rb_root *root,
                 * Sort strictly based on sector.  Smallest to the left,
                 * largest to the right.
                 */
-               if (sector > cfqq->next_rq->sector)
+               if (sector > blk_rq_pos(cfqq->next_rq))
                        n = &(*p)->rb_right;
-               else if (sector < cfqq->next_rq->sector)
+               else if (sector < blk_rq_pos(cfqq->next_rq))
                        n = &(*p)->rb_left;
                else
                        break;
@@ -611,8 +611,8 @@ static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq)
                return;
 
        cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio];
-       __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, cfqq->next_rq->sector,
-                                        &parent, &p);
+       __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root,
+                                     blk_rq_pos(cfqq->next_rq), &parent, &p);
        if (!__cfqq) {
                rb_link_node(&cfqq->p_node, parent, p);
                rb_insert_color(&cfqq->p_node, cfqq->p_root);
@@ -760,7 +760,7 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq)
        cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
                                                cfqd->rq_in_driver);
 
-       cfqd->last_position = rq->hard_sector + rq->hard_nr_sectors;
+       cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq);
 }
 
 static void cfq_deactivate_request(struct request_queue *q, struct request *rq)
@@ -949,10 +949,10 @@ static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd,
 static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd,
                                          struct request *rq)
 {
-       if (rq->sector >= cfqd->last_position)
-               return rq->sector - cfqd->last_position;
+       if (blk_rq_pos(rq) >= cfqd->last_position)
+               return blk_rq_pos(rq) - cfqd->last_position;
        else
-               return cfqd->last_position - rq->sector;
+               return cfqd->last_position - blk_rq_pos(rq);
 }
 
 #define CIC_SEEK_THR   8 * 1024
@@ -996,7 +996,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
        if (cfq_rq_close(cfqd, __cfqq->next_rq))
                return __cfqq;
 
-       if (__cfqq->next_rq->sector < sector)
+       if (blk_rq_pos(__cfqq->next_rq) < sector)
                node = rb_next(&__cfqq->p_node);
        else
                node = rb_prev(&__cfqq->p_node);
@@ -1282,7 +1282,7 @@ static void cfq_dispatch_request(struct cfq_data *cfqd, struct cfq_queue *cfqq)
        if (!cfqd->active_cic) {
                struct cfq_io_context *cic = RQ_CIC(rq);
 
-               atomic_inc(&cic->ioc->refcount);
+               atomic_long_inc(&cic->ioc->refcount);
                cfqd->active_cic = cic;
        }
 }
@@ -1918,10 +1918,10 @@ cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_io_context *cic,
 
        if (!cic->last_request_pos)
                sdist = 0;
-       else if (cic->last_request_pos < rq->sector)
-               sdist = rq->sector - cic->last_request_pos;
+       else if (cic->last_request_pos < blk_rq_pos(rq))
+               sdist = blk_rq_pos(rq) - cic->last_request_pos;
        else
-               sdist = cic->last_request_pos - rq->sector;
+               sdist = cic->last_request_pos - blk_rq_pos(rq);
 
        /*
         * Don't allow the seek distance to get too large from the
@@ -2071,7 +2071,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
        cfq_update_io_seektime(cfqd, cic, rq);
        cfq_update_idle_window(cfqd, cfqq, cic);
 
-       cic->last_request_pos = rq->sector + rq->nr_sectors;
+       cic->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
 
        if (cfqq == cfqd->active_queue) {
                /*
@@ -2088,7 +2088,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
                        if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE ||
                            cfqd->busy_queues > 1) {
                                del_timer(&cfqd->idle_slice_timer);
-                               blk_start_queueing(cfqd->queue);
+                       __blk_run_queue(cfqd->queue);
                        }
                        cfq_mark_cfqq_must_dispatch(cfqq);
                }
@@ -2100,7 +2100,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
                 * this new queue is RT and the current one is BE
                 */
                cfq_preempt_queue(cfqd, cfqq);
-               blk_start_queueing(cfqd->queue);
+               __blk_run_queue(cfqd->queue);
        }
 }
 
@@ -2345,7 +2345,7 @@ static void cfq_kick_queue(struct work_struct *work)
        struct request_queue *q = cfqd->queue;
 
        spin_lock_irq(q->queue_lock);
-       blk_start_queueing(q);
+       __blk_run_queue(cfqd->queue);
        spin_unlock_irq(q->queue_lock);
 }