diff options
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index b0b754a6882b..a55a9bd75bd1 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -154,6 +154,8 @@ struct cfq_queue { unsigned long rb_key; /* prio tree member */ struct rb_node p_node; + /* prio tree root we belong to, if any */ + struct rb_root *p_root; /* sorted list of pending requests */ struct rb_root sort_list; /* if fifo isn't expired, next request to serve */ @@ -558,10 +560,10 @@ static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, } static struct cfq_queue * -cfq_prio_tree_lookup(struct cfq_data *cfqd, int ioprio, sector_t sector, - struct rb_node **ret_parent, struct rb_node ***rb_link) +cfq_prio_tree_lookup(struct cfq_data *cfqd, struct rb_root *root, + sector_t sector, struct rb_node **ret_parent, + struct rb_node ***rb_link) { - struct rb_root *root = &cfqd->prio_trees[ioprio]; struct rb_node **p, *parent; struct cfq_queue *cfqq = NULL; @@ -595,24 +597,27 @@ cfq_prio_tree_lookup(struct cfq_data *cfqd, int ioprio, sector_t sector, static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq) { - struct rb_root *root = &cfqd->prio_trees[cfqq->ioprio]; struct rb_node **p, *parent; struct cfq_queue *__cfqq; - if (!RB_EMPTY_NODE(&cfqq->p_node)) - rb_erase_init(&cfqq->p_node, root); + if (cfqq->p_root) { + rb_erase(&cfqq->p_node, cfqq->p_root); + cfqq->p_root = NULL; + } if (cfq_class_idle(cfqq)) return; if (!cfqq->next_rq) return; - __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->ioprio, cfqq->next_rq->sector, + cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio]; + __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, cfqq->next_rq->sector, &parent, &p); if (!__cfqq) { rb_link_node(&cfqq->p_node, parent, p); - rb_insert_color(&cfqq->p_node, root); - } + rb_insert_color(&cfqq->p_node, cfqq->p_root); + } else + cfqq->p_root = NULL; } /* @@ -657,8 +662,10 @@ static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) if (!RB_EMPTY_NODE(&cfqq->rb_node)) cfq_rb_erase(&cfqq->rb_node, &cfqd->service_tree); - if (!RB_EMPTY_NODE(&cfqq->p_node)) - rb_erase_init(&cfqq->p_node, &cfqd->prio_trees[cfqq->ioprio]); + if (cfqq->p_root) { + rb_erase(&cfqq->p_node, cfqq->p_root); + cfqq->p_root = NULL; + } BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; @@ -965,7 +972,7 @@ static inline int cfq_rq_close(struct cfq_data *cfqd, struct request *rq) static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, struct cfq_queue *cur_cfqq) { - struct rb_root *root = &cfqd->prio_trees[cur_cfqq->ioprio]; + struct rb_root *root = &cfqd->prio_trees[cur_cfqq->org_ioprio]; struct rb_node *parent, *node; struct cfq_queue *__cfqq; sector_t sector = cfqd->last_position; @@ -977,8 +984,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, * First, if we find a request starting at the end of the last * request, choose it. */ - __cfqq = cfq_prio_tree_lookup(cfqd, cur_cfqq->ioprio, - sector, &parent, NULL); + __cfqq = cfq_prio_tree_lookup(cfqd, root, sector, &parent, NULL); if (__cfqq) return __cfqq; |