2 * Functions related to sysfs handling
4 #include <linux/kernel.h>
5 #include <linux/slab.h>
6 #include <linux/module.h>
8 #include <linux/blkdev.h>
9 #include <linux/backing-dev.h>
10 #include <linux/blktrace_api.h>
11 #include <linux/blk-mq.h>
12 #include <linux/blk-cgroup.h>
18 struct queue_sysfs_entry {
19 struct attribute attr;
20 ssize_t (*show)(struct request_queue *, char *);
21 ssize_t (*store)(struct request_queue *, const char *, size_t);
25 queue_var_show(unsigned long var, char *page)
27 return sprintf(page, "%lu\n", var);
31 queue_var_store(unsigned long *var, const char *page, size_t count)
36 err = kstrtoul(page, 10, &v);
37 if (err || v > UINT_MAX)
45 static ssize_t queue_var_store64(s64 *var, const char *page)
50 err = kstrtos64(page, 10, &v);
58 static ssize_t queue_requests_show(struct request_queue *q, char *page)
60 return queue_var_show(q->nr_requests, (page));
64 queue_requests_store(struct request_queue *q, const char *page, size_t count)
69 if (!q->request_fn && !q->mq_ops)
72 ret = queue_var_store(&nr, page, count);
76 if (nr < BLKDEV_MIN_RQ)
80 err = blk_update_nr_requests(q, nr);
82 err = blk_mq_update_nr_requests(q, nr);
90 static ssize_t queue_ra_show(struct request_queue *q, char *page)
92 unsigned long ra_kb = q->backing_dev_info.ra_pages <<
95 return queue_var_show(ra_kb, (page));
99 queue_ra_store(struct request_queue *q, const char *page, size_t count)
102 ssize_t ret = queue_var_store(&ra_kb, page, count);
107 q->backing_dev_info.ra_pages = ra_kb >> (PAGE_SHIFT - 10);
112 static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
114 int max_sectors_kb = queue_max_sectors(q) >> 1;
116 return queue_var_show(max_sectors_kb, (page));
119 static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
121 return queue_var_show(queue_max_segments(q), (page));
124 static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
126 return queue_var_show(q->limits.max_integrity_segments, (page));
129 static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
131 if (blk_queue_cluster(q))
132 return queue_var_show(queue_max_segment_size(q), (page));
134 return queue_var_show(PAGE_SIZE, (page));
137 static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
139 return queue_var_show(queue_logical_block_size(q), page);
142 static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
144 return queue_var_show(queue_physical_block_size(q), page);
147 static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
149 return queue_var_show(q->limits.chunk_sectors, page);
152 static ssize_t queue_io_min_show(struct request_queue *q, char *page)
154 return queue_var_show(queue_io_min(q), page);
157 static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
159 return queue_var_show(queue_io_opt(q), page);
162 static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
164 return queue_var_show(q->limits.discard_granularity, page);
167 static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page)
170 return sprintf(page, "%llu\n",
171 (unsigned long long)q->limits.max_hw_discard_sectors << 9);
174 static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
176 return sprintf(page, "%llu\n",
177 (unsigned long long)q->limits.max_discard_sectors << 9);
180 static ssize_t queue_discard_max_store(struct request_queue *q,
181 const char *page, size_t count)
183 unsigned long max_discard;
184 ssize_t ret = queue_var_store(&max_discard, page, count);
189 if (max_discard & (q->limits.discard_granularity - 1))
193 if (max_discard > UINT_MAX)
196 if (max_discard > q->limits.max_hw_discard_sectors)
197 max_discard = q->limits.max_hw_discard_sectors;
199 q->limits.max_discard_sectors = max_discard;
203 static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
205 return queue_var_show(queue_discard_zeroes_data(q), page);
208 static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
210 return sprintf(page, "%llu\n",
211 (unsigned long long)q->limits.max_write_same_sectors << 9);
214 static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page)
216 return sprintf(page, "%llu\n",
217 (unsigned long long)q->limits.max_write_zeroes_sectors << 9);
221 queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
223 unsigned long max_sectors_kb,
224 max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
225 page_kb = 1 << (PAGE_SHIFT - 10);
226 ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
231 max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long)
232 q->limits.max_dev_sectors >> 1);
234 if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
237 spin_lock_irq(q->queue_lock);
238 q->limits.max_sectors = max_sectors_kb << 1;
239 q->backing_dev_info.io_pages = max_sectors_kb >> (PAGE_SHIFT - 10);
240 spin_unlock_irq(q->queue_lock);
245 static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
247 int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
249 return queue_var_show(max_hw_sectors_kb, (page));
252 #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
254 queue_show_##name(struct request_queue *q, char *page) \
257 bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
258 return queue_var_show(neg ? !bit : bit, page); \
261 queue_store_##name(struct request_queue *q, const char *page, size_t count) \
265 ret = queue_var_store(&val, page, count); \
271 spin_lock_irq(q->queue_lock); \
273 queue_flag_set(QUEUE_FLAG_##flag, q); \
275 queue_flag_clear(QUEUE_FLAG_##flag, q); \
276 spin_unlock_irq(q->queue_lock); \
280 QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
281 QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
282 QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
283 #undef QUEUE_SYSFS_BIT_FNS
285 static ssize_t queue_zoned_show(struct request_queue *q, char *page)
287 switch (blk_queue_zoned_model(q)) {
289 return sprintf(page, "host-aware\n");
291 return sprintf(page, "host-managed\n");
293 return sprintf(page, "none\n");
297 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
299 return queue_var_show((blk_queue_nomerges(q) << 1) |
300 blk_queue_noxmerges(q), page);
303 static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
307 ssize_t ret = queue_var_store(&nm, page, count);
312 spin_lock_irq(q->queue_lock);
313 queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
314 queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
316 queue_flag_set(QUEUE_FLAG_NOMERGES, q);
318 queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
319 spin_unlock_irq(q->queue_lock);
324 static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
326 bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
327 bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
329 return queue_var_show(set << force, page);
333 queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
335 ssize_t ret = -EINVAL;
339 ret = queue_var_store(&val, page, count);
343 spin_lock_irq(q->queue_lock);
345 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
346 queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
347 } else if (val == 1) {
348 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
349 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
350 } else if (val == 0) {
351 queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
352 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
354 spin_unlock_irq(q->queue_lock);
359 static ssize_t queue_poll_delay_show(struct request_queue *q, char *page)
363 if (q->poll_nsec == -1)
366 val = q->poll_nsec / 1000;
368 return sprintf(page, "%d\n", val);
371 static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
376 if (!q->mq_ops || !q->mq_ops->poll)
379 err = kstrtoint(page, 10, &val);
386 q->poll_nsec = val * 1000;
391 static ssize_t queue_poll_show(struct request_queue *q, char *page)
393 return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page);
396 static ssize_t queue_poll_store(struct request_queue *q, const char *page,
399 unsigned long poll_on;
402 if (!q->mq_ops || !q->mq_ops->poll)
405 ret = queue_var_store(&poll_on, page, count);
409 spin_lock_irq(q->queue_lock);
411 queue_flag_set(QUEUE_FLAG_POLL, q);
413 queue_flag_clear(QUEUE_FLAG_POLL, q);
414 spin_unlock_irq(q->queue_lock);
419 static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
424 return sprintf(page, "%llu\n", div_u64(q->rq_wb->min_lat_nsec, 1000));
427 static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
434 ret = queue_var_store64(&val, page);
452 rwb->min_lat_nsec = wbt_default_latency_nsec(q);
454 rwb->min_lat_nsec = val * 1000ULL;
456 if (rwb->enable_state == WBT_STATE_ON_DEFAULT)
457 rwb->enable_state = WBT_STATE_ON_MANUAL;
459 wbt_update_limits(rwb);
463 static ssize_t queue_wc_show(struct request_queue *q, char *page)
465 if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
466 return sprintf(page, "write back\n");
468 return sprintf(page, "write through\n");
471 static ssize_t queue_wc_store(struct request_queue *q, const char *page,
476 if (!strncmp(page, "write back", 10))
478 else if (!strncmp(page, "write through", 13) ||
479 !strncmp(page, "none", 4))
485 spin_lock_irq(q->queue_lock);
487 queue_flag_set(QUEUE_FLAG_WC, q);
489 queue_flag_clear(QUEUE_FLAG_WC, q);
490 spin_unlock_irq(q->queue_lock);
495 static ssize_t queue_dax_show(struct request_queue *q, char *page)
497 return queue_var_show(blk_queue_dax(q), page);
500 static ssize_t print_stat(char *page, struct blk_rq_stat *stat, const char *pre)
502 return sprintf(page, "%s samples=%llu, mean=%lld, min=%lld, max=%lld\n",
503 pre, (long long) stat->nr_samples,
504 (long long) stat->mean, (long long) stat->min,
505 (long long) stat->max);
508 static ssize_t queue_stats_show(struct request_queue *q, char *page)
510 struct blk_rq_stat stat[2];
513 blk_queue_stat_get(q, stat);
515 ret = print_stat(page, &stat[BLK_STAT_READ], "read :");
516 ret += print_stat(page + ret, &stat[BLK_STAT_WRITE], "write:");
520 static struct queue_sysfs_entry queue_requests_entry = {
521 .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
522 .show = queue_requests_show,
523 .store = queue_requests_store,
526 static struct queue_sysfs_entry queue_ra_entry = {
527 .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
528 .show = queue_ra_show,
529 .store = queue_ra_store,
532 static struct queue_sysfs_entry queue_max_sectors_entry = {
533 .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
534 .show = queue_max_sectors_show,
535 .store = queue_max_sectors_store,
538 static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
539 .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
540 .show = queue_max_hw_sectors_show,
543 static struct queue_sysfs_entry queue_max_segments_entry = {
544 .attr = {.name = "max_segments", .mode = S_IRUGO },
545 .show = queue_max_segments_show,
548 static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
549 .attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
550 .show = queue_max_integrity_segments_show,
553 static struct queue_sysfs_entry queue_max_segment_size_entry = {
554 .attr = {.name = "max_segment_size", .mode = S_IRUGO },
555 .show = queue_max_segment_size_show,
558 static struct queue_sysfs_entry queue_iosched_entry = {
559 .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
560 .show = elv_iosched_show,
561 .store = elv_iosched_store,
564 static struct queue_sysfs_entry queue_hw_sector_size_entry = {
565 .attr = {.name = "hw_sector_size", .mode = S_IRUGO },
566 .show = queue_logical_block_size_show,
569 static struct queue_sysfs_entry queue_logical_block_size_entry = {
570 .attr = {.name = "logical_block_size", .mode = S_IRUGO },
571 .show = queue_logical_block_size_show,
574 static struct queue_sysfs_entry queue_physical_block_size_entry = {
575 .attr = {.name = "physical_block_size", .mode = S_IRUGO },
576 .show = queue_physical_block_size_show,
579 static struct queue_sysfs_entry queue_chunk_sectors_entry = {
580 .attr = {.name = "chunk_sectors", .mode = S_IRUGO },
581 .show = queue_chunk_sectors_show,
584 static struct queue_sysfs_entry queue_io_min_entry = {
585 .attr = {.name = "minimum_io_size", .mode = S_IRUGO },
586 .show = queue_io_min_show,
589 static struct queue_sysfs_entry queue_io_opt_entry = {
590 .attr = {.name = "optimal_io_size", .mode = S_IRUGO },
591 .show = queue_io_opt_show,
594 static struct queue_sysfs_entry queue_discard_granularity_entry = {
595 .attr = {.name = "discard_granularity", .mode = S_IRUGO },
596 .show = queue_discard_granularity_show,
599 static struct queue_sysfs_entry queue_discard_max_hw_entry = {
600 .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO },
601 .show = queue_discard_max_hw_show,
604 static struct queue_sysfs_entry queue_discard_max_entry = {
605 .attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR },
606 .show = queue_discard_max_show,
607 .store = queue_discard_max_store,
610 static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
611 .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
612 .show = queue_discard_zeroes_data_show,
615 static struct queue_sysfs_entry queue_write_same_max_entry = {
616 .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO },
617 .show = queue_write_same_max_show,
620 static struct queue_sysfs_entry queue_write_zeroes_max_entry = {
621 .attr = {.name = "write_zeroes_max_bytes", .mode = S_IRUGO },
622 .show = queue_write_zeroes_max_show,
625 static struct queue_sysfs_entry queue_nonrot_entry = {
626 .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
627 .show = queue_show_nonrot,
628 .store = queue_store_nonrot,
631 static struct queue_sysfs_entry queue_zoned_entry = {
632 .attr = {.name = "zoned", .mode = S_IRUGO },
633 .show = queue_zoned_show,
636 static struct queue_sysfs_entry queue_nomerges_entry = {
637 .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
638 .show = queue_nomerges_show,
639 .store = queue_nomerges_store,
642 static struct queue_sysfs_entry queue_rq_affinity_entry = {
643 .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
644 .show = queue_rq_affinity_show,
645 .store = queue_rq_affinity_store,
648 static struct queue_sysfs_entry queue_iostats_entry = {
649 .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
650 .show = queue_show_iostats,
651 .store = queue_store_iostats,
654 static struct queue_sysfs_entry queue_random_entry = {
655 .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
656 .show = queue_show_random,
657 .store = queue_store_random,
660 static struct queue_sysfs_entry queue_poll_entry = {
661 .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR },
662 .show = queue_poll_show,
663 .store = queue_poll_store,
666 static struct queue_sysfs_entry queue_poll_delay_entry = {
667 .attr = {.name = "io_poll_delay", .mode = S_IRUGO | S_IWUSR },
668 .show = queue_poll_delay_show,
669 .store = queue_poll_delay_store,
672 static struct queue_sysfs_entry queue_wc_entry = {
673 .attr = {.name = "write_cache", .mode = S_IRUGO | S_IWUSR },
674 .show = queue_wc_show,
675 .store = queue_wc_store,
678 static struct queue_sysfs_entry queue_dax_entry = {
679 .attr = {.name = "dax", .mode = S_IRUGO },
680 .show = queue_dax_show,
683 static struct queue_sysfs_entry queue_stats_entry = {
684 .attr = {.name = "stats", .mode = S_IRUGO },
685 .show = queue_stats_show,
688 static struct queue_sysfs_entry queue_wb_lat_entry = {
689 .attr = {.name = "wbt_lat_usec", .mode = S_IRUGO | S_IWUSR },
690 .show = queue_wb_lat_show,
691 .store = queue_wb_lat_store,
694 static struct attribute *default_attrs[] = {
695 &queue_requests_entry.attr,
696 &queue_ra_entry.attr,
697 &queue_max_hw_sectors_entry.attr,
698 &queue_max_sectors_entry.attr,
699 &queue_max_segments_entry.attr,
700 &queue_max_integrity_segments_entry.attr,
701 &queue_max_segment_size_entry.attr,
702 &queue_iosched_entry.attr,
703 &queue_hw_sector_size_entry.attr,
704 &queue_logical_block_size_entry.attr,
705 &queue_physical_block_size_entry.attr,
706 &queue_chunk_sectors_entry.attr,
707 &queue_io_min_entry.attr,
708 &queue_io_opt_entry.attr,
709 &queue_discard_granularity_entry.attr,
710 &queue_discard_max_entry.attr,
711 &queue_discard_max_hw_entry.attr,
712 &queue_discard_zeroes_data_entry.attr,
713 &queue_write_same_max_entry.attr,
714 &queue_write_zeroes_max_entry.attr,
715 &queue_nonrot_entry.attr,
716 &queue_zoned_entry.attr,
717 &queue_nomerges_entry.attr,
718 &queue_rq_affinity_entry.attr,
719 &queue_iostats_entry.attr,
720 &queue_random_entry.attr,
721 &queue_poll_entry.attr,
722 &queue_wc_entry.attr,
723 &queue_dax_entry.attr,
724 &queue_stats_entry.attr,
725 &queue_wb_lat_entry.attr,
726 &queue_poll_delay_entry.attr,
730 #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
733 queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
735 struct queue_sysfs_entry *entry = to_queue(attr);
736 struct request_queue *q =
737 container_of(kobj, struct request_queue, kobj);
742 mutex_lock(&q->sysfs_lock);
743 if (blk_queue_dying(q)) {
744 mutex_unlock(&q->sysfs_lock);
747 res = entry->show(q, page);
748 mutex_unlock(&q->sysfs_lock);
753 queue_attr_store(struct kobject *kobj, struct attribute *attr,
754 const char *page, size_t length)
756 struct queue_sysfs_entry *entry = to_queue(attr);
757 struct request_queue *q;
763 q = container_of(kobj, struct request_queue, kobj);
764 mutex_lock(&q->sysfs_lock);
765 if (blk_queue_dying(q)) {
766 mutex_unlock(&q->sysfs_lock);
769 res = entry->store(q, page, length);
770 mutex_unlock(&q->sysfs_lock);
774 static void blk_free_queue_rcu(struct rcu_head *rcu_head)
776 struct request_queue *q = container_of(rcu_head, struct request_queue,
778 kmem_cache_free(blk_requestq_cachep, q);
782 * blk_release_queue: - release a &struct request_queue when it is no longer needed
783 * @kobj: the kobj belonging to the request queue to be released
786 * blk_release_queue is the pair to blk_init_queue() or
787 * blk_queue_make_request(). It should be called when a request queue is
788 * being released; typically when a block device is being de-registered.
789 * Currently, its primary task it to free all the &struct request
790 * structures that were allocated to the queue and the queue itself.
793 * The low level driver must have finished any outstanding requests first
794 * via blk_cleanup_queue().
796 static void blk_release_queue(struct kobject *kobj)
798 struct request_queue *q =
799 container_of(kobj, struct request_queue, kobj);
802 bdi_exit(&q->backing_dev_info);
806 spin_lock_irq(q->queue_lock);
808 spin_unlock_irq(q->queue_lock);
809 elevator_exit(q->elevator);
812 blk_exit_rl(&q->root_rl);
815 __blk_queue_free_tags(q);
818 blk_free_flush_queue(q->fq);
822 blk_trace_shutdown(q);
825 bioset_free(q->bio_split);
827 ida_simple_remove(&blk_queue_ida, q->id);
828 call_rcu(&q->rcu_head, blk_free_queue_rcu);
831 static const struct sysfs_ops queue_sysfs_ops = {
832 .show = queue_attr_show,
833 .store = queue_attr_store,
836 struct kobj_type blk_queue_ktype = {
837 .sysfs_ops = &queue_sysfs_ops,
838 .default_attrs = default_attrs,
839 .release = blk_release_queue,
842 static void blk_wb_init(struct request_queue *q)
844 #ifndef CONFIG_BLK_WBT_MQ
848 #ifndef CONFIG_BLK_WBT_SQ
854 * If this fails, we don't get throttling
859 int blk_register_queue(struct gendisk *disk)
862 struct device *dev = disk_to_dev(disk);
863 struct request_queue *q = disk->queue;
869 * SCSI probing may synchronously create and destroy a lot of
870 * request_queues for non-existent devices. Shutting down a fully
871 * functional queue takes measureable wallclock time as RCU grace
872 * periods are involved. To avoid excessive latency in these
873 * cases, a request_queue starts out in a degraded mode which is
874 * faster to shut down and is made fully functional here as
875 * request_queues for non-existent devices never get registered.
877 if (!blk_queue_init_done(q)) {
878 queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);
879 percpu_ref_switch_to_percpu(&q->q_usage_counter);
880 blk_queue_bypass_end(q);
883 ret = blk_trace_init_sysfs(dev);
887 ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
889 blk_trace_remove_sysfs(dev);
893 kobject_uevent(&q->kobj, KOBJ_ADD);
896 blk_mq_register_dev(dev, q);
903 ret = elv_register_queue(q);
905 kobject_uevent(&q->kobj, KOBJ_REMOVE);
906 kobject_del(&q->kobj);
907 blk_trace_remove_sysfs(dev);
908 kobject_put(&dev->kobj);
915 void blk_unregister_queue(struct gendisk *disk)
917 struct request_queue *q = disk->queue;
923 blk_mq_unregister_dev(disk_to_dev(disk), q);
926 elv_unregister_queue(q);
928 kobject_uevent(&q->kobj, KOBJ_REMOVE);
929 kobject_del(&q->kobj);
930 blk_trace_remove_sysfs(disk_to_dev(disk));
931 kobject_put(&disk_to_dev(disk)->kobj);