diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/elevator.c | 57 |
1 files changed, 30 insertions, 27 deletions
diff --git a/block/elevator.c b/block/elevator.c index 8cd5775..bafbae0 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -45,7 +45,8 @@ static LIST_HEAD(elv_list); */ static const int elv_hash_shift = 6; #define ELV_HASH_BLOCK(sec) ((sec) >> 3) -#define ELV_HASH_FN(sec) (hash_long(ELV_HASH_BLOCK((sec)), elv_hash_shift)) +#define ELV_HASH_FN(sec) \ + (hash_long(ELV_HASH_BLOCK((sec)), elv_hash_shift)) #define ELV_HASH_ENTRIES (1 << elv_hash_shift) #define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors) #define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash)) @@ -224,15 +225,27 @@ int elevator_init(struct request_queue *q, char *name) q->end_sector = 0; q->boundary_rq = NULL; - if (name && !(e = elevator_get(name))) - return -EINVAL; + if (name) { + e = elevator_get(name); + if (!e) + return -EINVAL; + } - if (!e && *chosen_elevator && !(e = elevator_get(chosen_elevator))) - printk("I/O scheduler %s not found\n", chosen_elevator); + if (!e && *chosen_elevator) { + e = elevator_get(chosen_elevator); + if (!e) + printk(KERN_ERR "I/O scheduler %s not found\n", + chosen_elevator); + } - if (!e && !(e = elevator_get(CONFIG_DEFAULT_IOSCHED))) { - printk("Default I/O scheduler not found, using no-op\n"); - e = elevator_get("noop"); + if (!e) { + e = elevator_get(CONFIG_DEFAULT_IOSCHED); + if (!e) { + printk(KERN_ERR + "Default I/O scheduler not found. " \ + "Using noop.\n"); + e = elevator_get("noop"); + } } eq = elevator_alloc(q, e); @@ -248,7 +261,6 @@ int elevator_init(struct request_queue *q, char *name) elevator_attach(q, eq, data); return ret; } - EXPORT_SYMBOL(elevator_init); void elevator_exit(elevator_t *e) @@ -261,7 +273,6 @@ void elevator_exit(elevator_t *e) kobject_put(&e->kobj); } - EXPORT_SYMBOL(elevator_exit); static void elv_activate_rq(struct request_queue *q, struct request *rq) @@ -353,7 +364,6 @@ struct request *elv_rb_add(struct rb_root *root, struct request *rq) rb_insert_color(&rq->rb_node, root); return NULL; } - EXPORT_SYMBOL(elv_rb_add); void elv_rb_del(struct rb_root *root, struct request *rq) @@ -362,7 +372,6 @@ void elv_rb_del(struct rb_root *root, struct request *rq) rb_erase(&rq->rb_node, root); RB_CLEAR_NODE(&rq->rb_node); } - EXPORT_SYMBOL(elv_rb_del); struct request *elv_rb_find(struct rb_root *root, sector_t sector) @@ -383,7 +392,6 @@ struct request *elv_rb_find(struct rb_root *root, sector_t sector) return NULL; } - EXPORT_SYMBOL(elv_rb_find); /* @@ -395,6 +403,7 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq) { sector_t boundary; struct list_head *entry; + int stop_flags; if (q->last_merge == rq) q->last_merge = NULL; @@ -404,13 +413,13 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq) q->nr_sorted--; boundary = q->end_sector; - + stop_flags = REQ_SOFTBARRIER | REQ_HARDBARRIER | REQ_STARTED; list_for_each_prev(entry, &q->queue_head) { struct request *pos = list_entry_rq(entry); if (rq_data_dir(rq) != rq_data_dir(pos)) break; - if (pos->cmd_flags & (REQ_SOFTBARRIER|REQ_HARDBARRIER|REQ_STARTED)) + if (pos->cmd_flags & stop_flags) break; if (rq->sector >= boundary) { if (pos->sector < boundary) @@ -425,7 +434,6 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq) list_add(&rq->queuelist, entry); } - EXPORT_SYMBOL(elv_dispatch_sort); /* @@ -446,7 +454,6 @@ void elv_dispatch_add_tail(struct request_queue *q, struct request *rq) q->boundary_rq = rq; list_add_tail(&rq->queuelist, &q->queue_head); } - EXPORT_SYMBOL(elv_dispatch_add_tail); int elv_merge(struct request_queue *q, struct request **req, struct bio *bio) @@ -665,7 +672,8 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where, q->end_sector = rq_end_sector(rq); q->boundary_rq = rq; } - } else if (!(rq->cmd_flags & REQ_ELVPRIV) && where == ELEVATOR_INSERT_SORT) + } else if (!(rq->cmd_flags & REQ_ELVPRIV) && + where == ELEVATOR_INSERT_SORT) where = ELEVATOR_INSERT_BACK; if (plug) @@ -673,7 +681,6 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where, elv_insert(q, rq, where); } - EXPORT_SYMBOL(__elv_add_request); void elv_add_request(struct request_queue *q, struct request *rq, int where, @@ -685,7 +692,6 @@ void elv_add_request(struct request_queue *q, struct request *rq, int where, __elv_add_request(q, rq, where, plug); spin_unlock_irqrestore(q->queue_lock, flags); } - EXPORT_SYMBOL(elv_add_request); static inline struct request *__elv_next_request(struct request_queue *q) @@ -792,7 +798,6 @@ struct request *elv_next_request(struct request_queue *q) return rq; } - EXPORT_SYMBOL(elv_next_request); void elv_dequeue_request(struct request_queue *q, struct request *rq) @@ -810,7 +815,6 @@ void elv_dequeue_request(struct request_queue *q, struct request *rq) if (blk_account_rq(rq)) q->in_flight++; } - EXPORT_SYMBOL(elv_dequeue_request); int elv_queue_empty(struct request_queue *q) @@ -825,7 +829,6 @@ int elv_queue_empty(struct request_queue *q) return 1; } - EXPORT_SYMBOL(elv_queue_empty); struct request *elv_latter_request(struct request_queue *q, struct request *rq) @@ -994,7 +997,8 @@ void elv_register(struct elevator_type *e) !strcmp(e->elevator_name, CONFIG_DEFAULT_IOSCHED))) def = " (default)"; - printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name, def); + printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name, + def); } EXPORT_SYMBOL_GPL(elv_register); @@ -1126,7 +1130,8 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name, } if (!elevator_switch(q, e)) - printk(KERN_ERR "elevator: switch to %s failed\n",elevator_name); + printk(KERN_ERR "elevator: switch to %s failed\n", + elevator_name); return count; } @@ -1160,7 +1165,6 @@ struct request *elv_rb_former_request(struct request_queue *q, return NULL; } - EXPORT_SYMBOL(elv_rb_former_request); struct request *elv_rb_latter_request(struct request_queue *q, @@ -1173,5 +1177,4 @@ struct request *elv_rb_latter_request(struct request_queue *q, return NULL; } - EXPORT_SYMBOL(elv_rb_latter_request); |
