summaryrefslogtreecommitdiffstats
path: root/block/noop-iosched.c
diff options
context:
space:
mode:
authorJens Axboe <axboe@kernel.dk>2018-10-12 10:14:46 -0600
committerJens Axboe <axboe@kernel.dk>2018-11-07 13:42:32 -0700
commitf382fb0bcef4c37dc049e9f6963e3baf204d815c (patch)
treedbfbe5689176a03ea1590497f965b40b2f8fd532 /block/noop-iosched.c
parent404b8f5a03d840f74669fd55e26f8e3564cc2dd8 (diff)
downloadlinux-f382fb0bcef4c37dc049e9f6963e3baf204d815c.tar.bz2
block: remove legacy IO schedulers
Retain the deadline documentation, as that carries over to mq-deadline as well. Tested-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/noop-iosched.c')
-rw-r--r--block/noop-iosched.c124
1 files changed, 0 insertions, 124 deletions
diff --git a/block/noop-iosched.c b/block/noop-iosched.c
deleted file mode 100644
index 2d1b15d89b45..000000000000
--- a/block/noop-iosched.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/*
- * elevator noop
- */
-#include <linux/blkdev.h>
-#include <linux/elevator.h>
-#include <linux/bio.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-
-struct noop_data {
- struct list_head queue;
-};
-
-static void noop_merged_requests(struct request_queue *q, struct request *rq,
- struct request *next)
-{
- list_del_init(&next->queuelist);
-}
-
-static int noop_dispatch(struct request_queue *q, int force)
-{
- struct noop_data *nd = q->elevator->elevator_data;
- struct request *rq;
-
- rq = list_first_entry_or_null(&nd->queue, struct request, queuelist);
- if (rq) {
- list_del_init(&rq->queuelist);
- elv_dispatch_sort(q, rq);
- return 1;
- }
- return 0;
-}
-
-static void noop_add_request(struct request_queue *q, struct request *rq)
-{
- struct noop_data *nd = q->elevator->elevator_data;
-
- list_add_tail(&rq->queuelist, &nd->queue);
-}
-
-static struct request *
-noop_former_request(struct request_queue *q, struct request *rq)
-{
- struct noop_data *nd = q->elevator->elevator_data;
-
- if (rq->queuelist.prev == &nd->queue)
- return NULL;
- return list_prev_entry(rq, queuelist);
-}
-
-static struct request *
-noop_latter_request(struct request_queue *q, struct request *rq)
-{
- struct noop_data *nd = q->elevator->elevator_data;
-
- if (rq->queuelist.next == &nd->queue)
- return NULL;
- return list_next_entry(rq, queuelist);
-}
-
-static int noop_init_queue(struct request_queue *q, struct elevator_type *e)
-{
- struct noop_data *nd;
- struct elevator_queue *eq;
-
- eq = elevator_alloc(q, e);
- if (!eq)
- return -ENOMEM;
-
- nd = kmalloc_node(sizeof(*nd), GFP_KERNEL, q->node);
- if (!nd) {
- kobject_put(&eq->kobj);
- return -ENOMEM;
- }
- eq->elevator_data = nd;
-
- INIT_LIST_HEAD(&nd->queue);
-
- spin_lock_irq(q->queue_lock);
- q->elevator = eq;
- spin_unlock_irq(q->queue_lock);
- return 0;
-}
-
-static void noop_exit_queue(struct elevator_queue *e)
-{
- struct noop_data *nd = e->elevator_data;
-
- BUG_ON(!list_empty(&nd->queue));
- kfree(nd);
-}
-
-static struct elevator_type elevator_noop = {
- .ops.sq = {
- .elevator_merge_req_fn = noop_merged_requests,
- .elevator_dispatch_fn = noop_dispatch,
- .elevator_add_req_fn = noop_add_request,
- .elevator_former_req_fn = noop_former_request,
- .elevator_latter_req_fn = noop_latter_request,
- .elevator_init_fn = noop_init_queue,
- .elevator_exit_fn = noop_exit_queue,
- },
- .elevator_name = "noop",
- .elevator_owner = THIS_MODULE,
-};
-
-static int __init noop_init(void)
-{
- return elv_register(&elevator_noop);
-}
-
-static void __exit noop_exit(void)
-{
- elv_unregister(&elevator_noop);
-}
-
-module_init(noop_init);
-module_exit(noop_exit);
-
-
-MODULE_AUTHOR("Jens Axboe");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("No-op IO scheduler");