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-rw-r--r--block/elevator.c824
1 files changed, 824 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c
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index 0000000000..5ff093cb3c
--- /dev/null
+++ b/block/elevator.c
@@ -0,0 +1,824 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Block device elevator/IO-scheduler.
+ *
+ * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
+ *
+ * 30042000 Jens Axboe <axboe@kernel.dk> :
+ *
+ * Split the elevator a bit so that it is possible to choose a different
+ * one or even write a new "plug in". There are three pieces:
+ * - elevator_fn, inserts a new request in the queue list
+ * - elevator_merge_fn, decides whether a new buffer can be merged with
+ * an existing request
+ * - elevator_dequeue_fn, called when a request is taken off the active list
+ *
+ * 20082000 Dave Jones <davej@suse.de> :
+ * Removed tests for max-bomb-segments, which was breaking elvtune
+ * when run without -bN
+ *
+ * Jens:
+ * - Rework again to work with bio instead of buffer_heads
+ * - loose bi_dev comparisons, partition handling is right now
+ * - completely modularize elevator setup and teardown
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <linux/bio.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/compiler.h>
+#include <linux/blktrace_api.h>
+#include <linux/hash.h>
+#include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
+
+#include <trace/events/block.h>
+
+#include "elevator.h"
+#include "blk.h"
+#include "blk-mq-sched.h"
+#include "blk-pm.h"
+#include "blk-wbt.h"
+#include "blk-cgroup.h"
+
+static DEFINE_SPINLOCK(elv_list_lock);
+static LIST_HEAD(elv_list);
+
+/*
+ * Merge hash stuff.
+ */
+#define rq_hash_key(rq) (blk_rq_pos(rq) + blk_rq_sectors(rq))
+
+/*
+ * Query io scheduler to see if the current process issuing bio may be
+ * merged with rq.
+ */
+static bool elv_iosched_allow_bio_merge(struct request *rq, struct bio *bio)
+{
+ struct request_queue *q = rq->q;
+ struct elevator_queue *e = q->elevator;
+
+ if (e->type->ops.allow_merge)
+ return e->type->ops.allow_merge(q, rq, bio);
+
+ return true;
+}
+
+/*
+ * can we safely merge with this request?
+ */
+bool elv_bio_merge_ok(struct request *rq, struct bio *bio)
+{
+ if (!blk_rq_merge_ok(rq, bio))
+ return false;
+
+ if (!elv_iosched_allow_bio_merge(rq, bio))
+ return false;
+
+ return true;
+}
+EXPORT_SYMBOL(elv_bio_merge_ok);
+
+static inline bool elv_support_features(struct request_queue *q,
+ const struct elevator_type *e)
+{
+ return (q->required_elevator_features & e->elevator_features) ==
+ q->required_elevator_features;
+}
+
+/**
+ * elevator_match - Check whether @e's name or alias matches @name
+ * @e: Scheduler to test
+ * @name: Elevator name to test
+ *
+ * Return true if the elevator @e's name or alias matches @name.
+ */
+static bool elevator_match(const struct elevator_type *e, const char *name)
+{
+ return !strcmp(e->elevator_name, name) ||
+ (e->elevator_alias && !strcmp(e->elevator_alias, name));
+}
+
+static struct elevator_type *__elevator_find(const char *name)
+{
+ struct elevator_type *e;
+
+ list_for_each_entry(e, &elv_list, list)
+ if (elevator_match(e, name))
+ return e;
+ return NULL;
+}
+
+static struct elevator_type *elevator_find_get(struct request_queue *q,
+ const char *name)
+{
+ struct elevator_type *e;
+
+ spin_lock(&elv_list_lock);
+ e = __elevator_find(name);
+ if (e && (!elv_support_features(q, e) || !elevator_tryget(e)))
+ e = NULL;
+ spin_unlock(&elv_list_lock);
+ return e;
+}
+
+static const struct kobj_type elv_ktype;
+
+struct elevator_queue *elevator_alloc(struct request_queue *q,
+ struct elevator_type *e)
+{
+ struct elevator_queue *eq;
+
+ eq = kzalloc_node(sizeof(*eq), GFP_KERNEL, q->node);
+ if (unlikely(!eq))
+ return NULL;
+
+ __elevator_get(e);
+ eq->type = e;
+ kobject_init(&eq->kobj, &elv_ktype);
+ mutex_init(&eq->sysfs_lock);
+ hash_init(eq->hash);
+
+ return eq;
+}
+EXPORT_SYMBOL(elevator_alloc);
+
+static void elevator_release(struct kobject *kobj)
+{
+ struct elevator_queue *e;
+
+ e = container_of(kobj, struct elevator_queue, kobj);
+ elevator_put(e->type);
+ kfree(e);
+}
+
+void elevator_exit(struct request_queue *q)
+{
+ struct elevator_queue *e = q->elevator;
+
+ ioc_clear_queue(q);
+ blk_mq_sched_free_rqs(q);
+
+ mutex_lock(&e->sysfs_lock);
+ blk_mq_exit_sched(q, e);
+ mutex_unlock(&e->sysfs_lock);
+
+ kobject_put(&e->kobj);
+}
+
+static inline void __elv_rqhash_del(struct request *rq)
+{
+ hash_del(&rq->hash);
+ rq->rq_flags &= ~RQF_HASHED;
+}
+
+void elv_rqhash_del(struct request_queue *q, struct request *rq)
+{
+ if (ELV_ON_HASH(rq))
+ __elv_rqhash_del(rq);
+}
+EXPORT_SYMBOL_GPL(elv_rqhash_del);
+
+void elv_rqhash_add(struct request_queue *q, struct request *rq)
+{
+ struct elevator_queue *e = q->elevator;
+
+ BUG_ON(ELV_ON_HASH(rq));
+ hash_add(e->hash, &rq->hash, rq_hash_key(rq));
+ rq->rq_flags |= RQF_HASHED;
+}
+EXPORT_SYMBOL_GPL(elv_rqhash_add);
+
+void elv_rqhash_reposition(struct request_queue *q, struct request *rq)
+{
+ __elv_rqhash_del(rq);
+ elv_rqhash_add(q, rq);
+}
+
+struct request *elv_rqhash_find(struct request_queue *q, sector_t offset)
+{
+ struct elevator_queue *e = q->elevator;
+ struct hlist_node *next;
+ struct request *rq;
+
+ hash_for_each_possible_safe(e->hash, rq, next, hash, offset) {
+ BUG_ON(!ELV_ON_HASH(rq));
+
+ if (unlikely(!rq_mergeable(rq))) {
+ __elv_rqhash_del(rq);
+ continue;
+ }
+
+ if (rq_hash_key(rq) == offset)
+ return rq;
+ }
+
+ return NULL;
+}
+
+/*
+ * RB-tree support functions for inserting/lookup/removal of requests
+ * in a sorted RB tree.
+ */
+void elv_rb_add(struct rb_root *root, struct request *rq)
+{
+ struct rb_node **p = &root->rb_node;
+ struct rb_node *parent = NULL;
+ struct request *__rq;
+
+ while (*p) {
+ parent = *p;
+ __rq = rb_entry(parent, struct request, rb_node);
+
+ if (blk_rq_pos(rq) < blk_rq_pos(__rq))
+ p = &(*p)->rb_left;
+ else if (blk_rq_pos(rq) >= blk_rq_pos(__rq))
+ p = &(*p)->rb_right;
+ }
+
+ rb_link_node(&rq->rb_node, parent, p);
+ rb_insert_color(&rq->rb_node, root);
+}
+EXPORT_SYMBOL(elv_rb_add);
+
+void elv_rb_del(struct rb_root *root, struct request *rq)
+{
+ BUG_ON(RB_EMPTY_NODE(&rq->rb_node));
+ rb_erase(&rq->rb_node, root);
+ RB_CLEAR_NODE(&rq->rb_node);
+}
+EXPORT_SYMBOL(elv_rb_del);
+
+struct request *elv_rb_find(struct rb_root *root, sector_t sector)
+{
+ struct rb_node *n = root->rb_node;
+ struct request *rq;
+
+ while (n) {
+ rq = rb_entry(n, struct request, rb_node);
+
+ if (sector < blk_rq_pos(rq))
+ n = n->rb_left;
+ else if (sector > blk_rq_pos(rq))
+ n = n->rb_right;
+ else
+ return rq;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(elv_rb_find);
+
+enum elv_merge elv_merge(struct request_queue *q, struct request **req,
+ struct bio *bio)
+{
+ struct elevator_queue *e = q->elevator;
+ struct request *__rq;
+
+ /*
+ * Levels of merges:
+ * nomerges: No merges at all attempted
+ * noxmerges: Only simple one-hit cache try
+ * merges: All merge tries attempted
+ */
+ if (blk_queue_nomerges(q) || !bio_mergeable(bio))
+ return ELEVATOR_NO_MERGE;
+
+ /*
+ * First try one-hit cache.
+ */
+ if (q->last_merge && elv_bio_merge_ok(q->last_merge, bio)) {
+ enum elv_merge ret = blk_try_merge(q->last_merge, bio);
+
+ if (ret != ELEVATOR_NO_MERGE) {
+ *req = q->last_merge;
+ return ret;
+ }
+ }
+
+ if (blk_queue_noxmerges(q))
+ return ELEVATOR_NO_MERGE;
+
+ /*
+ * See if our hash lookup can find a potential backmerge.
+ */
+ __rq = elv_rqhash_find(q, bio->bi_iter.bi_sector);
+ if (__rq && elv_bio_merge_ok(__rq, bio)) {
+ *req = __rq;
+
+ if (blk_discard_mergable(__rq))
+ return ELEVATOR_DISCARD_MERGE;
+ return ELEVATOR_BACK_MERGE;
+ }
+
+ if (e->type->ops.request_merge)
+ return e->type->ops.request_merge(q, req, bio);
+
+ return ELEVATOR_NO_MERGE;
+}
+
+/*
+ * Attempt to do an insertion back merge. Only check for the case where
+ * we can append 'rq' to an existing request, so we can throw 'rq' away
+ * afterwards.
+ *
+ * Returns true if we merged, false otherwise. 'free' will contain all
+ * requests that need to be freed.
+ */
+bool elv_attempt_insert_merge(struct request_queue *q, struct request *rq,
+ struct list_head *free)
+{
+ struct request *__rq;
+ bool ret;
+
+ if (blk_queue_nomerges(q))
+ return false;
+
+ /*
+ * First try one-hit cache.
+ */
+ if (q->last_merge && blk_attempt_req_merge(q, q->last_merge, rq)) {
+ list_add(&rq->queuelist, free);
+ return true;
+ }
+
+ if (blk_queue_noxmerges(q))
+ return false;
+
+ ret = false;
+ /*
+ * See if our hash lookup can find a potential backmerge.
+ */
+ while (1) {
+ __rq = elv_rqhash_find(q, blk_rq_pos(rq));
+ if (!__rq || !blk_attempt_req_merge(q, __rq, rq))
+ break;
+
+ list_add(&rq->queuelist, free);
+ /* The merged request could be merged with others, try again */
+ ret = true;
+ rq = __rq;
+ }
+
+ return ret;
+}
+
+void elv_merged_request(struct request_queue *q, struct request *rq,
+ enum elv_merge type)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (e->type->ops.request_merged)
+ e->type->ops.request_merged(q, rq, type);
+
+ if (type == ELEVATOR_BACK_MERGE)
+ elv_rqhash_reposition(q, rq);
+
+ q->last_merge = rq;
+}
+
+void elv_merge_requests(struct request_queue *q, struct request *rq,
+ struct request *next)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (e->type->ops.requests_merged)
+ e->type->ops.requests_merged(q, rq, next);
+
+ elv_rqhash_reposition(q, rq);
+ q->last_merge = rq;
+}
+
+struct request *elv_latter_request(struct request_queue *q, struct request *rq)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (e->type->ops.next_request)
+ return e->type->ops.next_request(q, rq);
+
+ return NULL;
+}
+
+struct request *elv_former_request(struct request_queue *q, struct request *rq)
+{
+ struct elevator_queue *e = q->elevator;
+
+ if (e->type->ops.former_request)
+ return e->type->ops.former_request(q, rq);
+
+ return NULL;
+}
+
+#define to_elv(atr) container_of((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);
+ struct elevator_queue *e;
+ ssize_t error;
+
+ if (!entry->show)
+ return -EIO;
+
+ e = container_of(kobj, struct elevator_queue, kobj);
+ mutex_lock(&e->sysfs_lock);
+ error = e->type ? entry->show(e, page) : -ENOENT;
+ mutex_unlock(&e->sysfs_lock);
+ return error;
+}
+
+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);
+ struct elevator_queue *e;
+ ssize_t error;
+
+ if (!entry->store)
+ return -EIO;
+
+ e = container_of(kobj, struct elevator_queue, kobj);
+ mutex_lock(&e->sysfs_lock);
+ error = e->type ? entry->store(e, page, length) : -ENOENT;
+ mutex_unlock(&e->sysfs_lock);
+ return error;
+}
+
+static const struct sysfs_ops elv_sysfs_ops = {
+ .show = elv_attr_show,
+ .store = elv_attr_store,
+};
+
+static const struct kobj_type elv_ktype = {
+ .sysfs_ops = &elv_sysfs_ops,
+ .release = elevator_release,
+};
+
+int elv_register_queue(struct request_queue *q, bool uevent)
+{
+ struct elevator_queue *e = q->elevator;
+ int error;
+
+ lockdep_assert_held(&q->sysfs_lock);
+
+ error = kobject_add(&e->kobj, &q->disk->queue_kobj, "iosched");
+ if (!error) {
+ struct elv_fs_entry *attr = e->type->elevator_attrs;
+ if (attr) {
+ while (attr->attr.name) {
+ if (sysfs_create_file(&e->kobj, &attr->attr))
+ break;
+ attr++;
+ }
+ }
+ if (uevent)
+ kobject_uevent(&e->kobj, KOBJ_ADD);
+
+ set_bit(ELEVATOR_FLAG_REGISTERED, &e->flags);
+ }
+ return error;
+}
+
+void elv_unregister_queue(struct request_queue *q)
+{
+ struct elevator_queue *e = q->elevator;
+
+ lockdep_assert_held(&q->sysfs_lock);
+
+ if (e && test_and_clear_bit(ELEVATOR_FLAG_REGISTERED, &e->flags)) {
+ kobject_uevent(&e->kobj, KOBJ_REMOVE);
+ kobject_del(&e->kobj);
+ }
+}
+
+int elv_register(struct elevator_type *e)
+{
+ /* finish request is mandatory */
+ if (WARN_ON_ONCE(!e->ops.finish_request))
+ return -EINVAL;
+ /* insert_requests and dispatch_request are mandatory */
+ if (WARN_ON_ONCE(!e->ops.insert_requests || !e->ops.dispatch_request))
+ return -EINVAL;
+
+ /* create icq_cache if requested */
+ if (e->icq_size) {
+ if (WARN_ON(e->icq_size < sizeof(struct io_cq)) ||
+ WARN_ON(e->icq_align < __alignof__(struct io_cq)))
+ return -EINVAL;
+
+ snprintf(e->icq_cache_name, sizeof(e->icq_cache_name),
+ "%s_io_cq", e->elevator_name);
+ e->icq_cache = kmem_cache_create(e->icq_cache_name, e->icq_size,
+ e->icq_align, 0, NULL);
+ if (!e->icq_cache)
+ return -ENOMEM;
+ }
+
+ /* register, don't allow duplicate names */
+ spin_lock(&elv_list_lock);
+ if (__elevator_find(e->elevator_name)) {
+ spin_unlock(&elv_list_lock);
+ kmem_cache_destroy(e->icq_cache);
+ return -EBUSY;
+ }
+ list_add_tail(&e->list, &elv_list);
+ spin_unlock(&elv_list_lock);
+
+ printk(KERN_INFO "io scheduler %s registered\n", e->elevator_name);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(elv_register);
+
+void elv_unregister(struct elevator_type *e)
+{
+ /* unregister */
+ spin_lock(&elv_list_lock);
+ list_del_init(&e->list);
+ spin_unlock(&elv_list_lock);
+
+ /*
+ * Destroy icq_cache if it exists. icq's are RCU managed. Make
+ * sure all RCU operations are complete before proceeding.
+ */
+ if (e->icq_cache) {
+ rcu_barrier();
+ kmem_cache_destroy(e->icq_cache);
+ e->icq_cache = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(elv_unregister);
+
+static inline bool elv_support_iosched(struct request_queue *q)
+{
+ if (!queue_is_mq(q) ||
+ (q->tag_set && (q->tag_set->flags & BLK_MQ_F_NO_SCHED)))
+ return false;
+ return true;
+}
+
+/*
+ * For single queue devices, default to using mq-deadline. If we have multiple
+ * queues or mq-deadline is not available, default to "none".
+ */
+static struct elevator_type *elevator_get_default(struct request_queue *q)
+{
+ if (q->tag_set && q->tag_set->flags & BLK_MQ_F_NO_SCHED_BY_DEFAULT)
+ return NULL;
+
+ if (q->nr_hw_queues != 1 &&
+ !blk_mq_is_shared_tags(q->tag_set->flags))
+ return NULL;
+
+ return elevator_find_get(q, "mq-deadline");
+}
+
+/*
+ * Get the first elevator providing the features required by the request queue.
+ * Default to "none" if no matching elevator is found.
+ */
+static struct elevator_type *elevator_get_by_features(struct request_queue *q)
+{
+ struct elevator_type *e, *found = NULL;
+
+ spin_lock(&elv_list_lock);
+
+ list_for_each_entry(e, &elv_list, list) {
+ if (elv_support_features(q, e)) {
+ found = e;
+ break;
+ }
+ }
+
+ if (found && !elevator_tryget(found))
+ found = NULL;
+
+ spin_unlock(&elv_list_lock);
+ return found;
+}
+
+/*
+ * For a device queue that has no required features, use the default elevator
+ * settings. Otherwise, use the first elevator available matching the required
+ * features. If no suitable elevator is find or if the chosen elevator
+ * initialization fails, fall back to the "none" elevator (no elevator).
+ */
+void elevator_init_mq(struct request_queue *q)
+{
+ struct elevator_type *e;
+ int err;
+
+ if (!elv_support_iosched(q))
+ return;
+
+ WARN_ON_ONCE(blk_queue_registered(q));
+
+ if (unlikely(q->elevator))
+ return;
+
+ if (!q->required_elevator_features)
+ e = elevator_get_default(q);
+ else
+ e = elevator_get_by_features(q);
+ if (!e)
+ return;
+
+ /*
+ * We are called before adding disk, when there isn't any FS I/O,
+ * so freezing queue plus canceling dispatch work is enough to
+ * drain any dispatch activities originated from passthrough
+ * requests, then no need to quiesce queue which may add long boot
+ * latency, especially when lots of disks are involved.
+ */
+ blk_mq_freeze_queue(q);
+ blk_mq_cancel_work_sync(q);
+
+ err = blk_mq_init_sched(q, e);
+
+ blk_mq_unfreeze_queue(q);
+
+ if (err) {
+ pr_warn("\"%s\" elevator initialization failed, "
+ "falling back to \"none\"\n", e->elevator_name);
+ }
+
+ elevator_put(e);
+}
+
+/*
+ * Switch to new_e io scheduler.
+ *
+ * If switching fails, we are most likely running out of memory and not able
+ * to restore the old io scheduler, so leaving the io scheduler being none.
+ */
+int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
+{
+ int ret;
+
+ lockdep_assert_held(&q->sysfs_lock);
+
+ blk_mq_freeze_queue(q);
+ blk_mq_quiesce_queue(q);
+
+ if (q->elevator) {
+ elv_unregister_queue(q);
+ elevator_exit(q);
+ }
+
+ ret = blk_mq_init_sched(q, new_e);
+ if (ret)
+ goto out_unfreeze;
+
+ ret = elv_register_queue(q, true);
+ if (ret) {
+ elevator_exit(q);
+ goto out_unfreeze;
+ }
+ blk_add_trace_msg(q, "elv switch: %s", new_e->elevator_name);
+
+out_unfreeze:
+ blk_mq_unquiesce_queue(q);
+ blk_mq_unfreeze_queue(q);
+
+ if (ret) {
+ pr_warn("elv: switch to \"%s\" failed, falling back to \"none\"\n",
+ new_e->elevator_name);
+ }
+
+ return ret;
+}
+
+void elevator_disable(struct request_queue *q)
+{
+ lockdep_assert_held(&q->sysfs_lock);
+
+ blk_mq_freeze_queue(q);
+ blk_mq_quiesce_queue(q);
+
+ elv_unregister_queue(q);
+ elevator_exit(q);
+ blk_queue_flag_clear(QUEUE_FLAG_SQ_SCHED, q);
+ q->elevator = NULL;
+ q->nr_requests = q->tag_set->queue_depth;
+ blk_add_trace_msg(q, "elv switch: none");
+
+ blk_mq_unquiesce_queue(q);
+ blk_mq_unfreeze_queue(q);
+}
+
+/*
+ * Switch this queue to the given IO scheduler.
+ */
+static int elevator_change(struct request_queue *q, const char *elevator_name)
+{
+ struct elevator_type *e;
+ int ret;
+
+ /* Make sure queue is not in the middle of being removed */
+ if (!blk_queue_registered(q))
+ return -ENOENT;
+
+ if (!strncmp(elevator_name, "none", 4)) {
+ if (q->elevator)
+ elevator_disable(q);
+ return 0;
+ }
+
+ if (q->elevator && elevator_match(q->elevator->type, elevator_name))
+ return 0;
+
+ e = elevator_find_get(q, elevator_name);
+ if (!e) {
+ request_module("%s-iosched", elevator_name);
+ e = elevator_find_get(q, elevator_name);
+ if (!e)
+ return -EINVAL;
+ }
+ ret = elevator_switch(q, e);
+ elevator_put(e);
+ return ret;
+}
+
+ssize_t elv_iosched_store(struct request_queue *q, const char *buf,
+ size_t count)
+{
+ char elevator_name[ELV_NAME_MAX];
+ int ret;
+
+ if (!elv_support_iosched(q))
+ return count;
+
+ strscpy(elevator_name, buf, sizeof(elevator_name));
+ ret = elevator_change(q, strstrip(elevator_name));
+ if (!ret)
+ return count;
+ return ret;
+}
+
+ssize_t elv_iosched_show(struct request_queue *q, char *name)
+{
+ struct elevator_queue *eq = q->elevator;
+ struct elevator_type *cur = NULL, *e;
+ int len = 0;
+
+ if (!elv_support_iosched(q))
+ return sprintf(name, "none\n");
+
+ if (!q->elevator) {
+ len += sprintf(name+len, "[none] ");
+ } else {
+ len += sprintf(name+len, "none ");
+ cur = eq->type;
+ }
+
+ spin_lock(&elv_list_lock);
+ list_for_each_entry(e, &elv_list, list) {
+ if (e == cur)
+ len += sprintf(name+len, "[%s] ", e->elevator_name);
+ else if (elv_support_features(q, e))
+ len += sprintf(name+len, "%s ", e->elevator_name);
+ }
+ spin_unlock(&elv_list_lock);
+
+ len += sprintf(name+len, "\n");
+ return len;
+}
+
+struct request *elv_rb_former_request(struct request_queue *q,
+ struct request *rq)
+{
+ struct rb_node *rbprev = rb_prev(&rq->rb_node);
+
+ if (rbprev)
+ return rb_entry_rq(rbprev);
+
+ return NULL;
+}
+EXPORT_SYMBOL(elv_rb_former_request);
+
+struct request *elv_rb_latter_request(struct request_queue *q,
+ struct request *rq)
+{
+ struct rb_node *rbnext = rb_next(&rq->rb_node);
+
+ if (rbnext)
+ return rb_entry_rq(rbnext);
+
+ return NULL;
+}
+EXPORT_SYMBOL(elv_rb_latter_request);
+
+static int __init elevator_setup(char *str)
+{
+ pr_warn("Kernel parameter elevator= does not have any effect anymore.\n"
+ "Please use sysfs to set IO scheduler for individual devices.\n");
+ return 1;
+}
+
+__setup("elevator=", elevator_setup);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 04:40:05 +0000