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-rw-r--r--block/elevator.c23
-rw-r--r--include/linux/elevator.h1
2 files changed, 18 insertions, 6 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 77856bf29568..7bda083d5968 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -83,6 +83,16 @@ bool elv_bio_merge_ok(struct request *rq, struct bio *bio)
}
EXPORT_SYMBOL(elv_bio_merge_ok);
+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
*/
@@ -91,7 +101,7 @@ 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) && (mq == e->uses_mq))
+ if (elevator_match(e, name) && (mq == e->uses_mq))
return e;
}
@@ -922,9 +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,
@@ -1077,8 +1087,7 @@ static int __elevator_change(struct request_queue *q, const char *name)
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;
}
@@ -1114,6 +1123,7 @@ 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 (!queue_is_rq_based(q))
@@ -1126,7 +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;
}
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 5bc8f8682a3e..6df8b14f1f6a 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -144,6 +144,7 @@ struct elevator_type
size_t icq_align; /* ditto */
struct elv_fs_entry *elevator_attrs;
char elevator_name[ELV_NAME_MAX];
+ const char *elevator_alias;
struct module *elevator_owner;
bool uses_mq;
#ifdef CONFIG_BLK_DEBUG_FS