1 // SPDX-License-Identifier: GPL-2.0
3 * Functions related to sysfs handling
5 #include <linux/kernel.h>
6 #include <linux/slab.h>
7 #include <linux/module.h>
9 #include <linux/blkdev.h>
10 #include <linux/backing-dev.h>
11 #include <linux/blktrace_api.h>
12 #include <linux/debugfs.h>
16 #include "blk-mq-debugfs.h"
17 #include "blk-mq-sched.h"
18 #include "blk-rq-qos.h"
20 #include "blk-cgroup.h"
21 #include "blk-throttle.h"
23 struct queue_sysfs_entry {
24 struct attribute attr;
25 ssize_t (*show)(struct request_queue *, char *);
26 ssize_t (*store)(struct request_queue *, const char *, size_t);
30 queue_var_show(unsigned long var, char *page)
32 return sprintf(page, "%lu\n", var);
36 queue_var_store(unsigned long *var, const char *page, size_t count)
41 err = kstrtoul(page, 10, &v);
42 if (err || v > UINT_MAX)
50 static ssize_t queue_var_store64(s64 *var, const char *page)
55 err = kstrtos64(page, 10, &v);
63 static ssize_t queue_requests_show(struct request_queue *q, char *page)
65 return queue_var_show(q->nr_requests, page);
69 queue_requests_store(struct request_queue *q, const char *page, size_t count)
77 ret = queue_var_store(&nr, page, count);
81 if (nr < BLKDEV_MIN_RQ)
84 err = blk_mq_update_nr_requests(q, nr);
91 static ssize_t queue_ra_show(struct request_queue *q, char *page)
97 ra_kb = q->disk->bdi->ra_pages << (PAGE_SHIFT - 10);
98 return queue_var_show(ra_kb, page);
102 queue_ra_store(struct request_queue *q, const char *page, size_t count)
109 ret = queue_var_store(&ra_kb, page, count);
112 q->disk->bdi->ra_pages = ra_kb >> (PAGE_SHIFT - 10);
116 static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
118 int max_sectors_kb = queue_max_sectors(q) >> 1;
120 return queue_var_show(max_sectors_kb, page);
123 static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
125 return queue_var_show(queue_max_segments(q), page);
128 static ssize_t queue_max_discard_segments_show(struct request_queue *q,
131 return queue_var_show(queue_max_discard_segments(q), page);
134 static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
136 return queue_var_show(q->limits.max_integrity_segments, page);
139 static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
141 return queue_var_show(queue_max_segment_size(q), page);
144 static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
146 return queue_var_show(queue_logical_block_size(q), page);
149 static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
151 return queue_var_show(queue_physical_block_size(q), page);
154 static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
156 return queue_var_show(q->limits.chunk_sectors, page);
159 static ssize_t queue_io_min_show(struct request_queue *q, char *page)
161 return queue_var_show(queue_io_min(q), page);
164 static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
166 return queue_var_show(queue_io_opt(q), page);
169 static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
171 return queue_var_show(q->limits.discard_granularity, page);
174 static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page)
177 return sprintf(page, "%llu\n",
178 (unsigned long long)q->limits.max_hw_discard_sectors << 9);
181 static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
183 return sprintf(page, "%llu\n",
184 (unsigned long long)q->limits.max_discard_sectors << 9);
187 static ssize_t queue_discard_max_store(struct request_queue *q,
188 const char *page, size_t count)
190 unsigned long max_discard;
191 ssize_t ret = queue_var_store(&max_discard, page, count);
196 if (max_discard & (q->limits.discard_granularity - 1))
200 if (max_discard > UINT_MAX)
203 if (max_discard > q->limits.max_hw_discard_sectors)
204 max_discard = q->limits.max_hw_discard_sectors;
206 q->limits.max_discard_sectors = max_discard;
210 static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
212 return queue_var_show(0, page);
215 static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
217 return queue_var_show(0, page);
220 static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page)
222 return sprintf(page, "%llu\n",
223 (unsigned long long)q->limits.max_write_zeroes_sectors << 9);
226 static ssize_t queue_zone_write_granularity_show(struct request_queue *q,
229 return queue_var_show(queue_zone_write_granularity(q), page);
232 static ssize_t queue_zone_append_max_show(struct request_queue *q, char *page)
234 unsigned long long max_sectors = q->limits.max_zone_append_sectors;
236 return sprintf(page, "%llu\n", max_sectors << SECTOR_SHIFT);
240 queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
243 unsigned int max_sectors_kb,
244 max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
245 page_kb = 1 << (PAGE_SHIFT - 10);
246 ssize_t ret = queue_var_store(&var, page, count);
251 max_sectors_kb = (unsigned int)var;
252 max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb,
253 q->limits.max_dev_sectors >> 1);
254 if (max_sectors_kb == 0) {
255 q->limits.max_user_sectors = 0;
256 max_sectors_kb = min(max_hw_sectors_kb,
257 BLK_DEF_MAX_SECTORS >> 1);
259 if (max_sectors_kb > max_hw_sectors_kb ||
260 max_sectors_kb < page_kb)
262 q->limits.max_user_sectors = max_sectors_kb << 1;
265 spin_lock_irq(&q->queue_lock);
266 q->limits.max_sectors = max_sectors_kb << 1;
268 q->disk->bdi->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10);
269 spin_unlock_irq(&q->queue_lock);
274 static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
276 int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
278 return queue_var_show(max_hw_sectors_kb, page);
281 static ssize_t queue_virt_boundary_mask_show(struct request_queue *q, char *page)
283 return queue_var_show(q->limits.virt_boundary_mask, page);
286 static ssize_t queue_dma_alignment_show(struct request_queue *q, char *page)
288 return queue_var_show(queue_dma_alignment(q), page);
291 #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
293 queue_##name##_show(struct request_queue *q, char *page) \
296 bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
297 return queue_var_show(neg ? !bit : bit, page); \
300 queue_##name##_store(struct request_queue *q, const char *page, size_t count) \
304 ret = queue_var_store(&val, page, count); \
311 blk_queue_flag_set(QUEUE_FLAG_##flag, q); \
313 blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \
317 QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
318 QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
319 QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
320 QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0);
321 #undef QUEUE_SYSFS_BIT_FNS
323 static ssize_t queue_zoned_show(struct request_queue *q, char *page)
325 switch (blk_queue_zoned_model(q)) {
327 return sprintf(page, "host-aware\n");
329 return sprintf(page, "host-managed\n");
331 return sprintf(page, "none\n");
335 static ssize_t queue_nr_zones_show(struct request_queue *q, char *page)
337 return queue_var_show(disk_nr_zones(q->disk), page);
340 static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page)
342 return queue_var_show(bdev_max_open_zones(q->disk->part0), page);
345 static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page)
347 return queue_var_show(bdev_max_active_zones(q->disk->part0), page);
350 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
352 return queue_var_show((blk_queue_nomerges(q) << 1) |
353 blk_queue_noxmerges(q), page);
356 static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
360 ssize_t ret = queue_var_store(&nm, page, count);
365 blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
366 blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
368 blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q);
370 blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
375 static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
377 bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
378 bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
380 return queue_var_show(set << force, page);
384 queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
386 ssize_t ret = -EINVAL;
390 ret = queue_var_store(&val, page, count);
395 blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
396 blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
397 } else if (val == 1) {
398 blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
399 blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
400 } else if (val == 0) {
401 blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
402 blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
408 static ssize_t queue_poll_delay_show(struct request_queue *q, char *page)
410 return sprintf(page, "%d\n", -1);
413 static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
419 static ssize_t queue_poll_show(struct request_queue *q, char *page)
421 return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page);
424 static ssize_t queue_poll_store(struct request_queue *q, const char *page,
427 if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
429 pr_info_ratelimited("writes to the poll attribute are ignored.\n");
430 pr_info_ratelimited("please use driver specific parameters instead.\n");
434 static ssize_t queue_io_timeout_show(struct request_queue *q, char *page)
436 return sprintf(page, "%u\n", jiffies_to_msecs(q->rq_timeout));
439 static ssize_t queue_io_timeout_store(struct request_queue *q, const char *page,
445 err = kstrtou32(page, 10, &val);
449 blk_queue_rq_timeout(q, msecs_to_jiffies(val));
454 static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
460 return sprintf(page, "0\n");
462 return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
465 static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
472 ret = queue_var_store64(&val, page);
478 rqos = wbt_rq_qos(q);
480 ret = wbt_init(q->disk);
486 val = wbt_default_latency_nsec(q);
490 if (wbt_get_min_lat(q) == val)
494 * Ensure that the queue is idled, in case the latency update
495 * ends up either enabling or disabling wbt completely. We can't
496 * have IO inflight if that happens.
498 blk_mq_freeze_queue(q);
499 blk_mq_quiesce_queue(q);
501 wbt_set_min_lat(q, val);
503 blk_mq_unquiesce_queue(q);
504 blk_mq_unfreeze_queue(q);
509 static ssize_t queue_wc_show(struct request_queue *q, char *page)
511 if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
512 return sprintf(page, "write back\n");
514 return sprintf(page, "write through\n");
517 static ssize_t queue_wc_store(struct request_queue *q, const char *page,
522 if (!strncmp(page, "write back", 10))
524 else if (!strncmp(page, "write through", 13) ||
525 !strncmp(page, "none", 4))
532 blk_queue_flag_set(QUEUE_FLAG_WC, q);
534 blk_queue_flag_clear(QUEUE_FLAG_WC, q);
539 static ssize_t queue_fua_show(struct request_queue *q, char *page)
541 return sprintf(page, "%u\n", test_bit(QUEUE_FLAG_FUA, &q->queue_flags));
544 static ssize_t queue_dax_show(struct request_queue *q, char *page)
546 return queue_var_show(blk_queue_dax(q), page);
549 #define QUEUE_RO_ENTRY(_prefix, _name) \
550 static struct queue_sysfs_entry _prefix##_entry = { \
551 .attr = { .name = _name, .mode = 0444 }, \
552 .show = _prefix##_show, \
555 #define QUEUE_RW_ENTRY(_prefix, _name) \
556 static struct queue_sysfs_entry _prefix##_entry = { \
557 .attr = { .name = _name, .mode = 0644 }, \
558 .show = _prefix##_show, \
559 .store = _prefix##_store, \
562 QUEUE_RW_ENTRY(queue_requests, "nr_requests");
563 QUEUE_RW_ENTRY(queue_ra, "read_ahead_kb");
564 QUEUE_RW_ENTRY(queue_max_sectors, "max_sectors_kb");
565 QUEUE_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb");
566 QUEUE_RO_ENTRY(queue_max_segments, "max_segments");
567 QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments");
568 QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size");
569 QUEUE_RW_ENTRY(elv_iosched, "scheduler");
571 QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size");
572 QUEUE_RO_ENTRY(queue_physical_block_size, "physical_block_size");
573 QUEUE_RO_ENTRY(queue_chunk_sectors, "chunk_sectors");
574 QUEUE_RO_ENTRY(queue_io_min, "minimum_io_size");
575 QUEUE_RO_ENTRY(queue_io_opt, "optimal_io_size");
577 QUEUE_RO_ENTRY(queue_max_discard_segments, "max_discard_segments");
578 QUEUE_RO_ENTRY(queue_discard_granularity, "discard_granularity");
579 QUEUE_RO_ENTRY(queue_discard_max_hw, "discard_max_hw_bytes");
580 QUEUE_RW_ENTRY(queue_discard_max, "discard_max_bytes");
581 QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data");
583 QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes");
584 QUEUE_RO_ENTRY(queue_write_zeroes_max, "write_zeroes_max_bytes");
585 QUEUE_RO_ENTRY(queue_zone_append_max, "zone_append_max_bytes");
586 QUEUE_RO_ENTRY(queue_zone_write_granularity, "zone_write_granularity");
588 QUEUE_RO_ENTRY(queue_zoned, "zoned");
589 QUEUE_RO_ENTRY(queue_nr_zones, "nr_zones");
590 QUEUE_RO_ENTRY(queue_max_open_zones, "max_open_zones");
591 QUEUE_RO_ENTRY(queue_max_active_zones, "max_active_zones");
593 QUEUE_RW_ENTRY(queue_nomerges, "nomerges");
594 QUEUE_RW_ENTRY(queue_rq_affinity, "rq_affinity");
595 QUEUE_RW_ENTRY(queue_poll, "io_poll");
596 QUEUE_RW_ENTRY(queue_poll_delay, "io_poll_delay");
597 QUEUE_RW_ENTRY(queue_wc, "write_cache");
598 QUEUE_RO_ENTRY(queue_fua, "fua");
599 QUEUE_RO_ENTRY(queue_dax, "dax");
600 QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout");
601 QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
602 QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask");
603 QUEUE_RO_ENTRY(queue_dma_alignment, "dma_alignment");
605 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
606 QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time");
609 /* legacy alias for logical_block_size: */
610 static struct queue_sysfs_entry queue_hw_sector_size_entry = {
611 .attr = {.name = "hw_sector_size", .mode = 0444 },
612 .show = queue_logical_block_size_show,
615 QUEUE_RW_ENTRY(queue_nonrot, "rotational");
616 QUEUE_RW_ENTRY(queue_iostats, "iostats");
617 QUEUE_RW_ENTRY(queue_random, "add_random");
618 QUEUE_RW_ENTRY(queue_stable_writes, "stable_writes");
620 static struct attribute *queue_attrs[] = {
621 &queue_requests_entry.attr,
622 &queue_ra_entry.attr,
623 &queue_max_hw_sectors_entry.attr,
624 &queue_max_sectors_entry.attr,
625 &queue_max_segments_entry.attr,
626 &queue_max_discard_segments_entry.attr,
627 &queue_max_integrity_segments_entry.attr,
628 &queue_max_segment_size_entry.attr,
629 &elv_iosched_entry.attr,
630 &queue_hw_sector_size_entry.attr,
631 &queue_logical_block_size_entry.attr,
632 &queue_physical_block_size_entry.attr,
633 &queue_chunk_sectors_entry.attr,
634 &queue_io_min_entry.attr,
635 &queue_io_opt_entry.attr,
636 &queue_discard_granularity_entry.attr,
637 &queue_discard_max_entry.attr,
638 &queue_discard_max_hw_entry.attr,
639 &queue_discard_zeroes_data_entry.attr,
640 &queue_write_same_max_entry.attr,
641 &queue_write_zeroes_max_entry.attr,
642 &queue_zone_append_max_entry.attr,
643 &queue_zone_write_granularity_entry.attr,
644 &queue_nonrot_entry.attr,
645 &queue_zoned_entry.attr,
646 &queue_nr_zones_entry.attr,
647 &queue_max_open_zones_entry.attr,
648 &queue_max_active_zones_entry.attr,
649 &queue_nomerges_entry.attr,
650 &queue_rq_affinity_entry.attr,
651 &queue_iostats_entry.attr,
652 &queue_stable_writes_entry.attr,
653 &queue_random_entry.attr,
654 &queue_poll_entry.attr,
655 &queue_wc_entry.attr,
656 &queue_fua_entry.attr,
657 &queue_dax_entry.attr,
658 &queue_wb_lat_entry.attr,
659 &queue_poll_delay_entry.attr,
660 &queue_io_timeout_entry.attr,
661 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
662 &blk_throtl_sample_time_entry.attr,
664 &queue_virt_boundary_mask_entry.attr,
665 &queue_dma_alignment_entry.attr,
669 static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
672 struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
673 struct request_queue *q = disk->queue;
675 if (attr == &queue_io_timeout_entry.attr &&
676 (!q->mq_ops || !q->mq_ops->timeout))
679 if ((attr == &queue_max_open_zones_entry.attr ||
680 attr == &queue_max_active_zones_entry.attr) &&
681 !blk_queue_is_zoned(q))
687 static struct attribute_group queue_attr_group = {
688 .attrs = queue_attrs,
689 .is_visible = queue_attr_visible,
693 #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
696 queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
698 struct queue_sysfs_entry *entry = to_queue(attr);
699 struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
700 struct request_queue *q = disk->queue;
705 mutex_lock(&q->sysfs_lock);
706 res = entry->show(q, page);
707 mutex_unlock(&q->sysfs_lock);
712 queue_attr_store(struct kobject *kobj, struct attribute *attr,
713 const char *page, size_t length)
715 struct queue_sysfs_entry *entry = to_queue(attr);
716 struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
717 struct request_queue *q = disk->queue;
723 mutex_lock(&q->sysfs_lock);
724 res = entry->store(q, page, length);
725 mutex_unlock(&q->sysfs_lock);
729 static const struct sysfs_ops queue_sysfs_ops = {
730 .show = queue_attr_show,
731 .store = queue_attr_store,
734 static const struct attribute_group *blk_queue_attr_groups[] = {
739 static void blk_queue_release(struct kobject *kobj)
741 /* nothing to do here, all data is associated with the parent gendisk */
744 static const struct kobj_type blk_queue_ktype = {
745 .default_groups = blk_queue_attr_groups,
746 .sysfs_ops = &queue_sysfs_ops,
747 .release = blk_queue_release,
750 static void blk_debugfs_remove(struct gendisk *disk)
752 struct request_queue *q = disk->queue;
754 mutex_lock(&q->debugfs_mutex);
755 blk_trace_shutdown(q);
756 debugfs_remove_recursive(q->debugfs_dir);
757 q->debugfs_dir = NULL;
758 q->sched_debugfs_dir = NULL;
759 q->rqos_debugfs_dir = NULL;
760 mutex_unlock(&q->debugfs_mutex);
764 * blk_register_queue - register a block layer queue with sysfs
765 * @disk: Disk of which the request queue should be registered with sysfs.
767 int blk_register_queue(struct gendisk *disk)
769 struct request_queue *q = disk->queue;
772 mutex_lock(&q->sysfs_dir_lock);
773 kobject_init(&disk->queue_kobj, &blk_queue_ktype);
774 ret = kobject_add(&disk->queue_kobj, &disk_to_dev(disk)->kobj, "queue");
776 goto out_put_queue_kobj;
778 if (queue_is_mq(q)) {
779 ret = blk_mq_sysfs_register(disk);
781 goto out_put_queue_kobj;
783 mutex_lock(&q->sysfs_lock);
785 mutex_lock(&q->debugfs_mutex);
786 q->debugfs_dir = debugfs_create_dir(disk->disk_name, blk_debugfs_root);
788 blk_mq_debugfs_register(q);
789 mutex_unlock(&q->debugfs_mutex);
791 ret = disk_register_independent_access_ranges(disk);
793 goto out_debugfs_remove;
796 ret = elv_register_queue(q, false);
798 goto out_unregister_ia_ranges;
801 ret = blk_crypto_sysfs_register(disk);
803 goto out_elv_unregister;
805 blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);
806 wbt_enable_default(disk);
807 blk_throtl_register(disk);
809 /* Now everything is ready and send out KOBJ_ADD uevent */
810 kobject_uevent(&disk->queue_kobj, KOBJ_ADD);
812 kobject_uevent(&q->elevator->kobj, KOBJ_ADD);
813 mutex_unlock(&q->sysfs_lock);
814 mutex_unlock(&q->sysfs_dir_lock);
817 * SCSI probing may synchronously create and destroy a lot of
818 * request_queues for non-existent devices. Shutting down a fully
819 * functional queue takes measureable wallclock time as RCU grace
820 * periods are involved. To avoid excessive latency in these
821 * cases, a request_queue starts out in a degraded mode which is
822 * faster to shut down and is made fully functional here as
823 * request_queues for non-existent devices never get registered.
825 if (!blk_queue_init_done(q)) {
826 blk_queue_flag_set(QUEUE_FLAG_INIT_DONE, q);
827 percpu_ref_switch_to_percpu(&q->q_usage_counter);
833 elv_unregister_queue(q);
834 out_unregister_ia_ranges:
835 disk_unregister_independent_access_ranges(disk);
837 blk_debugfs_remove(disk);
838 mutex_unlock(&q->sysfs_lock);
840 kobject_put(&disk->queue_kobj);
841 mutex_unlock(&q->sysfs_dir_lock);
846 * blk_unregister_queue - counterpart of blk_register_queue()
847 * @disk: Disk of which the request queue should be unregistered from sysfs.
849 * Note: the caller is responsible for guaranteeing that this function is called
850 * after blk_register_queue() has finished.
852 void blk_unregister_queue(struct gendisk *disk)
854 struct request_queue *q = disk->queue;
859 /* Return early if disk->queue was never registered. */
860 if (!blk_queue_registered(q))
864 * Since sysfs_remove_dir() prevents adding new directory entries
865 * before removal of existing entries starts, protect against
866 * concurrent elv_iosched_store() calls.
868 mutex_lock(&q->sysfs_lock);
869 blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q);
870 mutex_unlock(&q->sysfs_lock);
872 mutex_lock(&q->sysfs_dir_lock);
874 * Remove the sysfs attributes before unregistering the queue data
875 * structures that can be modified through sysfs.
878 blk_mq_sysfs_unregister(disk);
879 blk_crypto_sysfs_unregister(disk);
881 mutex_lock(&q->sysfs_lock);
882 elv_unregister_queue(q);
883 disk_unregister_independent_access_ranges(disk);
884 mutex_unlock(&q->sysfs_lock);
886 /* Now that we've deleted all child objects, we can delete the queue. */
887 kobject_uevent(&disk->queue_kobj, KOBJ_REMOVE);
888 kobject_del(&disk->queue_kobj);
889 mutex_unlock(&q->sysfs_dir_lock);
891 blk_debugfs_remove(disk);