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elevator: allow name aliases

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Since we now lookup elevator types with the appropriate multiqueue
capability, allow schedulers to register with an alias alongside
the real name. This is in preparation for allowing 'mq-deadline'
to register an alias of 'deadline' as well.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2017-10-25 12:35:02 -06:00
parent 2527d99789
commit 8ac0d9a81e
2 changed files with 18 additions and 6 deletions
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23
block/elevator.c
View File

@ -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;
}

1
include/linux/elevator.h
View File

@ -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