summaryrefslogtreecommitdiff
path: root/block/elevator.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/elevator.c')
-rw-r--r--block/elevator.c67
1 files changed, 38 insertions, 29 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 153926a90901..7bda083d5968 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -83,12 +83,25 @@ bool elv_bio_merge_ok(struct request *rq, struct bio *bio)
}
EXPORT_SYMBOL(elv_bio_merge_ok);
-static struct elevator_type *elevator_find(const char *name)
+static bool elevator_match(const struct elevator_type *e, const char *name)
+{
+ if (!strcmp(e->elevator_name, name))
+ return true;
+ if (e->elevator_alias && !strcmp(e->elevator_alias, name))
+ return true;
+
+ return false;
+}
+
+/*
+ * Return scheduler with name 'name' and with matching 'mq capability
+ */
+static struct elevator_type *elevator_find(const char *name, bool mq)
{
struct elevator_type *e;
list_for_each_entry(e, &elv_list, list) {
- if (!strcmp(e->elevator_name, name))
+ if (elevator_match(e, name) && (mq == e->uses_mq))
return e;
}
@@ -100,25 +113,25 @@ static void elevator_put(struct elevator_type *e)
module_put(e->elevator_owner);
}
-static struct elevator_type *elevator_get(const char *name, bool try_loading)
+static struct elevator_type *elevator_get(struct request_queue *q,
+ const char *name, bool try_loading)
{
struct elevator_type *e;
spin_lock(&elv_list_lock);
- e = elevator_find(name);
+ e = elevator_find(name, q->mq_ops != NULL);
if (!e && try_loading) {
spin_unlock(&elv_list_lock);
request_module("%s-iosched", name);
spin_lock(&elv_list_lock);
- e = elevator_find(name);
+ e = elevator_find(name, q->mq_ops != NULL);
}
if (e && !try_module_get(e->elevator_owner))
e = NULL;
spin_unlock(&elv_list_lock);
-
return e;
}
@@ -144,8 +157,12 @@ void __init load_default_elevator_module(void)
if (!chosen_elevator[0])
return;
+ /*
+ * Boot parameter is deprecated, we haven't supported that for MQ.
+ * Only look for non-mq schedulers from here.
+ */
spin_lock(&elv_list_lock);
- e = elevator_find(chosen_elevator);
+ e = elevator_find(chosen_elevator, false);
spin_unlock(&elv_list_lock);
if (!e)
@@ -202,7 +219,7 @@ int elevator_init(struct request_queue *q, char *name)
q->boundary_rq = NULL;
if (name) {
- e = elevator_get(name, true);
+ e = elevator_get(q, name, true);
if (!e)
return -EINVAL;
}
@@ -214,7 +231,7 @@ int elevator_init(struct request_queue *q, char *name)
* allowed from async.
*/
if (!e && !q->mq_ops && *chosen_elevator) {
- e = elevator_get(chosen_elevator, false);
+ e = elevator_get(q, chosen_elevator, false);
if (!e)
printk(KERN_ERR "I/O scheduler %s not found\n",
chosen_elevator);
@@ -229,17 +246,17 @@ int elevator_init(struct request_queue *q, char *name)
*/
if (q->mq_ops) {
if (q->nr_hw_queues == 1)
- e = elevator_get("mq-deadline", false);
+ e = elevator_get(q, "mq-deadline", false);
if (!e)
return 0;
} else
- e = elevator_get(CONFIG_DEFAULT_IOSCHED, false);
+ e = elevator_get(q, CONFIG_DEFAULT_IOSCHED, false);
if (!e) {
printk(KERN_ERR
"Default I/O scheduler not found. " \
"Using noop.\n");
- e = elevator_get("noop", false);
+ e = elevator_get(q, "noop", false);
}
}
@@ -905,7 +922,7 @@ int elv_register(struct elevator_type *e)
/* register, don't allow duplicate names */
spin_lock(&elv_list_lock);
- if (elevator_find(e->elevator_name)) {
+ if (elevator_find(e->elevator_name, e->uses_mq)) {
spin_unlock(&elv_list_lock);
if (e->icq_cache)
kmem_cache_destroy(e->icq_cache);
@@ -915,9 +932,9 @@ int elv_register(struct elevator_type *e)
spin_unlock(&elv_list_lock);
/* print pretty message */
- if (!strcmp(e->elevator_name, chosen_elevator) ||
+ if (elevator_match(e, chosen_elevator) ||
(!*chosen_elevator &&
- !strcmp(e->elevator_name, CONFIG_DEFAULT_IOSCHED)))
+ elevator_match(e, CONFIG_DEFAULT_IOSCHED)))
def = " (default)";
printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name,
@@ -1066,25 +1083,15 @@ static int __elevator_change(struct request_queue *q, const char *name)
return elevator_switch(q, NULL);
strlcpy(elevator_name, name, sizeof(elevator_name));
- e = elevator_get(strstrip(elevator_name), true);
+ e = elevator_get(q, strstrip(elevator_name), true);
if (!e)
return -EINVAL;
- if (q->elevator &&
- !strcmp(elevator_name, q->elevator->type->elevator_name)) {
+ if (q->elevator && elevator_match(q->elevator->type, elevator_name)) {
elevator_put(e);
return 0;
}
- if (!e->uses_mq && q->mq_ops) {
- elevator_put(e);
- return -EINVAL;
- }
- if (e->uses_mq && !q->mq_ops) {
- elevator_put(e);
- return -EINVAL;
- }
-
return elevator_switch(q, e);
}
@@ -1116,9 +1123,10 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
struct elevator_queue *e = q->elevator;
struct elevator_type *elv = NULL;
struct elevator_type *__e;
+ bool uses_mq = q->mq_ops != NULL;
int len = 0;
- if (!blk_queue_stackable(q))
+ if (!queue_is_rq_based(q))
return sprintf(name, "none\n");
if (!q->elevator)
@@ -1128,7 +1136,8 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
spin_lock(&elv_list_lock);
list_for_each_entry(__e, &elv_list, list) {
- if (elv && !strcmp(elv->elevator_name, __e->elevator_name)) {
+ if (elv && elevator_match(elv, __e->elevator_name) &&
+ (__e->uses_mq == uses_mq)) {
len += sprintf(name+len, "[%s] ", elv->elevator_name);
continue;
}