*/
static int elv_iosched_allow_merge(struct request *rq, struct bio *bio)
{
- request_queue_t *q = rq->q;
+ struct request_queue *q = rq->q;
elevator_t *e = q->elevator;
if (e->ops->elevator_allow_merge_fn)
return e;
}
-static void *elevator_init_queue(request_queue_t *q, struct elevator_queue *eq)
+static void *elevator_init_queue(struct request_queue *q,
+ struct elevator_queue *eq)
{
return eq->ops->elevator_init_fn(q);
}
-static void elevator_attach(request_queue_t *q, struct elevator_queue *eq,
+static void elevator_attach(struct request_queue *q, struct elevator_queue *eq,
void *data)
{
q->elevator = eq;
static struct kobj_type elv_ktype;
-static elevator_t *elevator_alloc(request_queue_t *q, struct elevator_type *e)
+static elevator_t *elevator_alloc(struct request_queue *q,
+ struct elevator_type *e)
{
elevator_t *eq;
int i;
eq->ops = &e->ops;
eq->elevator_type = e;
- kobject_init(&eq->kobj);
- snprintf(eq->kobj.name, KOBJ_NAME_LEN, "%s", "iosched");
- eq->kobj.ktype = &elv_ktype;
+ kobject_init(&eq->kobj, &elv_ktype);
mutex_init(&eq->sysfs_lock);
eq->hash = kmalloc_node(sizeof(struct hlist_head) * ELV_HASH_ENTRIES,
kfree(e);
}
-int elevator_init(request_queue_t *q, char *name)
+int elevator_init(struct request_queue *q, char *name)
{
struct elevator_type *e = NULL;
struct elevator_queue *eq;
EXPORT_SYMBOL(elevator_exit);
-static void elv_activate_rq(request_queue_t *q, struct request *rq)
+static void elv_activate_rq(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
e->ops->elevator_activate_req_fn(q, rq);
}
-static void elv_deactivate_rq(request_queue_t *q, struct request *rq)
+static void elv_deactivate_rq(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
hlist_del_init(&rq->hash);
}
-static void elv_rqhash_del(request_queue_t *q, struct request *rq)
+static void elv_rqhash_del(struct request_queue *q, struct request *rq)
{
if (ELV_ON_HASH(rq))
__elv_rqhash_del(rq);
}
-static void elv_rqhash_add(request_queue_t *q, struct request *rq)
+static void elv_rqhash_add(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
hlist_add_head(&rq->hash, &e->hash[ELV_HASH_FN(rq_hash_key(rq))]);
}
-static void elv_rqhash_reposition(request_queue_t *q, struct request *rq)
+static void elv_rqhash_reposition(struct request_queue *q, struct request *rq)
{
__elv_rqhash_del(rq);
elv_rqhash_add(q, rq);
}
-static struct request *elv_rqhash_find(request_queue_t *q, sector_t offset)
+static struct request *elv_rqhash_find(struct request_queue *q, sector_t offset)
{
elevator_t *e = q->elevator;
struct hlist_head *hash_list = &e->hash[ELV_HASH_FN(offset)];
/*
* Insert rq into dispatch queue of q. Queue lock must be held on
- * entry. rq is sort insted into the dispatch queue. To be used by
+ * entry. rq is sort instead into the dispatch queue. To be used by
* specific elevators.
*/
-void elv_dispatch_sort(request_queue_t *q, struct request *rq)
+void elv_dispatch_sort(struct request_queue *q, struct request *rq)
{
sector_t boundary;
struct list_head *entry;
EXPORT_SYMBOL(elv_dispatch_add_tail);
-int elv_merge(request_queue_t *q, struct request **req, struct bio *bio)
+int elv_merge(struct request_queue *q, struct request **req, struct bio *bio)
{
elevator_t *e = q->elevator;
struct request *__rq;
return ELEVATOR_NO_MERGE;
}
-void elv_merged_request(request_queue_t *q, struct request *rq, int type)
+void elv_merged_request(struct request_queue *q, struct request *rq, int type)
{
elevator_t *e = q->elevator;
q->last_merge = rq;
}
-void elv_merge_requests(request_queue_t *q, struct request *rq,
+void elv_merge_requests(struct request_queue *q, struct request *rq,
struct request *next)
{
elevator_t *e = q->elevator;
q->last_merge = rq;
}
-void elv_requeue_request(request_queue_t *q, struct request *rq)
+void elv_requeue_request(struct request_queue *q, struct request *rq)
{
/*
* it already went through dequeue, we need to decrement the
elv_insert(q, rq, ELEVATOR_INSERT_REQUEUE);
}
-static void elv_drain_elevator(request_queue_t *q)
+static void elv_drain_elevator(struct request_queue *q)
{
static int printed;
while (q->elevator->ops->elevator_dispatch_fn(q, 1))
}
}
-void elv_insert(request_queue_t *q, struct request *rq, int where)
+void elv_insert(struct request_queue *q, struct request *rq, int where)
{
struct list_head *pos;
unsigned ordseq;
}
}
-void __elv_add_request(request_queue_t *q, struct request *rq, int where,
+void __elv_add_request(struct request_queue *q, struct request *rq, int where,
int plug)
{
if (q->ordcolor)
EXPORT_SYMBOL(__elv_add_request);
-void elv_add_request(request_queue_t *q, struct request *rq, int where,
+void elv_add_request(struct request_queue *q, struct request *rq, int where,
int plug)
{
unsigned long flags;
EXPORT_SYMBOL(elv_add_request);
-static inline struct request *__elv_next_request(request_queue_t *q)
+static inline struct request *__elv_next_request(struct request_queue *q)
{
struct request *rq;
}
}
-struct request *elv_next_request(request_queue_t *q)
+struct request *elv_next_request(struct request_queue *q)
{
struct request *rq;
int ret;
while ((rq = __elv_next_request(q)) != NULL) {
+ /*
+ * Kill the empty barrier place holder, the driver must
+ * not ever see it.
+ */
+ if (blk_empty_barrier(rq)) {
+ end_queued_request(rq, 1);
+ continue;
+ }
if (!(rq->cmd_flags & REQ_STARTED)) {
/*
* This is the first time the device driver
q->boundary_rq = NULL;
}
- if ((rq->cmd_flags & REQ_DONTPREP) || !q->prep_rq_fn)
+ if (rq->cmd_flags & REQ_DONTPREP)
+ break;
+
+ if (q->dma_drain_size && rq->data_len) {
+ /*
+ * make sure space for the drain appears we
+ * know we can do this because max_hw_segments
+ * has been adjusted to be one fewer than the
+ * device can handle
+ */
+ rq->nr_phys_segments++;
+ rq->nr_hw_segments++;
+ }
+
+ if (!q->prep_rq_fn)
break;
ret = q->prep_rq_fn(q, rq);
* avoid resource deadlock. REQ_STARTED will
* prevent other fs requests from passing this one.
*/
+ if (q->dma_drain_size && rq->data_len &&
+ !(rq->cmd_flags & REQ_DONTPREP)) {
+ /*
+ * remove the space for the drain we added
+ * so that we don't add it again
+ */
+ --rq->nr_phys_segments;
+ --rq->nr_hw_segments;
+ }
+
rq = NULL;
break;
} else if (ret == BLKPREP_KILL) {
- int nr_bytes = rq->hard_nr_sectors << 9;
-
- if (!nr_bytes)
- nr_bytes = rq->data_len;
-
- blkdev_dequeue_request(rq);
rq->cmd_flags |= REQ_QUIET;
- end_that_request_chunk(rq, 0, nr_bytes);
- end_that_request_last(rq, 0);
+ end_queued_request(rq, 0);
} else {
printk(KERN_ERR "%s: bad return=%d\n", __FUNCTION__,
ret);
EXPORT_SYMBOL(elv_next_request);
-void elv_dequeue_request(request_queue_t *q, struct request *rq)
+void elv_dequeue_request(struct request_queue *q, struct request *rq)
{
BUG_ON(list_empty(&rq->queuelist));
BUG_ON(ELV_ON_HASH(rq));
EXPORT_SYMBOL(elv_dequeue_request);
-int elv_queue_empty(request_queue_t *q)
+int elv_queue_empty(struct request_queue *q)
{
elevator_t *e = q->elevator;
EXPORT_SYMBOL(elv_queue_empty);
-struct request *elv_latter_request(request_queue_t *q, struct request *rq)
+struct request *elv_latter_request(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
return NULL;
}
-struct request *elv_former_request(request_queue_t *q, struct request *rq)
+struct request *elv_former_request(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
return NULL;
}
-int elv_set_request(request_queue_t *q, struct request *rq, gfp_t gfp_mask)
+int elv_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask)
{
elevator_t *e = q->elevator;
return 0;
}
-void elv_put_request(request_queue_t *q, struct request *rq)
+void elv_put_request(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
e->ops->elevator_put_req_fn(rq);
}
-int elv_may_queue(request_queue_t *q, int rw)
+int elv_may_queue(struct request_queue *q, int rw)
{
elevator_t *e = q->elevator;
return ELV_MQUEUE_MAY;
}
-void elv_completed_request(request_queue_t *q, struct request *rq)
+void elv_completed_request(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
elevator_t *e = q->elevator;
int error;
- e->kobj.parent = &q->kobj;
-
- error = kobject_add(&e->kobj);
+ error = kobject_add(&e->kobj, &q->kobj, "%s", "iosched");
if (!error) {
struct elv_fs_entry *attr = e->elevator_type->elevator_attrs;
if (attr) {
__elv_unregister_queue(q->elevator);
}
-int elv_register(struct elevator_type *e)
+void elv_register(struct elevator_type *e)
{
char *def = "";
def = " (default)";
printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name, def);
- return 0;
}
EXPORT_SYMBOL_GPL(elv_register);
* need for the new one. this way we have a chance of going back to the old
* one, if the new one fails init for some reason.
*/
-static int elevator_switch(request_queue_t *q, struct elevator_type *new_e)
+static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
{
elevator_t *old_elevator, *e;
void *data;
return 0;
}
-ssize_t elv_iosched_store(request_queue_t *q, const char *name, size_t count)
+ssize_t elv_iosched_store(struct request_queue *q, const char *name,
+ size_t count)
{
char elevator_name[ELV_NAME_MAX];
size_t len;
return count;
}
-ssize_t elv_iosched_show(request_queue_t *q, char *name)
+ssize_t elv_iosched_show(struct request_queue *q, char *name)
{
elevator_t *e = q->elevator;
struct elevator_type *elv = e->elevator_type;
return len;
}
-struct request *elv_rb_former_request(request_queue_t *q, struct request *rq)
+struct request *elv_rb_former_request(struct request_queue *q,
+ struct request *rq)
{
struct rb_node *rbprev = rb_prev(&rq->rb_node);
EXPORT_SYMBOL(elv_rb_former_request);
-struct request *elv_rb_latter_request(request_queue_t *q, struct request *rq)
+struct request *elv_rb_latter_request(struct request_queue *q,
+ struct request *rq)
{
struct rb_node *rbnext = rb_next(&rq->rb_node);