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elevator: Enable const sysfs attributes

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The elevator core does not need to modify the sysfs attributes added by
the elevators. Reflect this in the types, so the attributes can be moved
into read-only memory.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20250102-sysfs-const-attr-elevator-v1-1-9837d2058c60@weissschuh.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Thomas Weißschuh 2025-01-02 13:01:31 +01:00 committed by Jens Axboe
parent cb01ecb799
commit 044792cda0
2 changed files with 5 additions and 5 deletions
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8
block/elevator.c
View File

@ -405,12 +405,12 @@ struct request *elv_former_request(struct request_queue *q, struct request *rq)
return NULL;
}
#define to_elv(atr) container_of((atr), struct elv_fs_entry, attr)
#define to_elv(atr) container_of_const((atr), struct elv_fs_entry, attr)
static ssize_t
elv_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct elv_fs_entry *entry = to_elv(attr);
const struct elv_fs_entry *entry = to_elv(attr);
struct elevator_queue *e;
ssize_t error;
@ -428,7 +428,7 @@ static ssize_t
elv_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t length)
{
struct elv_fs_entry *entry = to_elv(attr);
const struct elv_fs_entry *entry = to_elv(attr);
struct elevator_queue *e;
ssize_t error;
@ -461,7 +461,7 @@ int elv_register_queue(struct request_queue *q, bool uevent)
error = kobject_add(&e->kobj, &q->disk->queue_kobj, "iosched");
if (!error) {
struct elv_fs_entry *attr = e->type->elevator_attrs;
const struct elv_fs_entry *attr = e->type->elevator_attrs;
if (attr) {
while (attr->attr.name) {
if (sysfs_create_file(&e->kobj, &attr->attr))

2
block/elevator.h
View File

@ -71,7 +71,7 @@ struct elevator_type
size_t icq_size; /* see iocontext.h */
size_t icq_align; /* ditto */
struct elv_fs_entry *elevator_attrs;
const struct elv_fs_entry *elevator_attrs;
const char *elevator_name;
const char *elevator_alias;
struct module *elevator_owner;