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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Jeffle Xu](/assets/img/avatar_default.png)
QUEUE_FLAG_POLL flag will be cleared when turning off 'io_poll', while at that moment there may be IOs stuck in hw queue uncompleted. The following polling routine won't help reap these IOs, since blk_poll() will return immediately because of cleared QUEUE_FLAG_POLL flag. Thus these IOs will hang until they finnaly time out. The hang out can be observed by 'fio --engine=io_uring iodepth=1', while turning off 'io_poll' at the same time. To fix this, freeze and flush the request queue first when turning off 'io_poll'. Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
984 lines
25 KiB
C
984 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Functions related to sysfs handling
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/blktrace_api.h>
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#include <linux/blk-mq.h>
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#include <linux/blk-cgroup.h>
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#include <linux/debugfs.h>
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#include "blk.h"
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#include "blk-mq.h"
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#include "blk-mq-debugfs.h"
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#include "blk-wbt.h"
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struct queue_sysfs_entry {
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struct attribute attr;
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ssize_t (*show)(struct request_queue *, char *);
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ssize_t (*store)(struct request_queue *, const char *, size_t);
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};
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static ssize_t
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queue_var_show(unsigned long var, char *page)
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{
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return sprintf(page, "%lu\n", var);
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}
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static ssize_t
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queue_var_store(unsigned long *var, const char *page, size_t count)
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{
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int err;
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unsigned long v;
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err = kstrtoul(page, 10, &v);
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if (err || v > UINT_MAX)
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return -EINVAL;
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*var = v;
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return count;
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}
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static ssize_t queue_var_store64(s64 *var, const char *page)
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{
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int err;
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s64 v;
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err = kstrtos64(page, 10, &v);
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if (err < 0)
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return err;
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*var = v;
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return 0;
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}
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static ssize_t queue_requests_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->nr_requests, (page));
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}
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static ssize_t
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queue_requests_store(struct request_queue *q, const char *page, size_t count)
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{
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unsigned long nr;
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int ret, err;
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if (!queue_is_mq(q))
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return -EINVAL;
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ret = queue_var_store(&nr, page, count);
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if (ret < 0)
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return ret;
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if (nr < BLKDEV_MIN_RQ)
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nr = BLKDEV_MIN_RQ;
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err = blk_mq_update_nr_requests(q, nr);
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if (err)
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return err;
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return ret;
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}
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static ssize_t queue_ra_show(struct request_queue *q, char *page)
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{
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unsigned long ra_kb = q->backing_dev_info->ra_pages <<
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(PAGE_SHIFT - 10);
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return queue_var_show(ra_kb, (page));
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}
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static ssize_t
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queue_ra_store(struct request_queue *q, const char *page, size_t count)
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{
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unsigned long ra_kb;
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ssize_t ret = queue_var_store(&ra_kb, page, count);
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if (ret < 0)
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return ret;
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q->backing_dev_info->ra_pages = ra_kb >> (PAGE_SHIFT - 10);
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return ret;
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}
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static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
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{
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int max_sectors_kb = queue_max_sectors(q) >> 1;
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return queue_var_show(max_sectors_kb, (page));
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}
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static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_max_segments(q), (page));
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}
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static ssize_t queue_max_discard_segments_show(struct request_queue *q,
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char *page)
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{
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return queue_var_show(queue_max_discard_segments(q), (page));
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}
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static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->limits.max_integrity_segments, (page));
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}
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static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_max_segment_size(q), (page));
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}
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static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_logical_block_size(q), page);
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}
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static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_physical_block_size(q), page);
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}
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static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->limits.chunk_sectors, page);
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}
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static ssize_t queue_io_min_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_io_min(q), page);
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}
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static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_io_opt(q), page);
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}
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static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->limits.discard_granularity, page);
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}
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static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page)
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{
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return sprintf(page, "%llu\n",
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(unsigned long long)q->limits.max_hw_discard_sectors << 9);
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}
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static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
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{
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return sprintf(page, "%llu\n",
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(unsigned long long)q->limits.max_discard_sectors << 9);
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}
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static ssize_t queue_discard_max_store(struct request_queue *q,
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const char *page, size_t count)
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{
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unsigned long max_discard;
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ssize_t ret = queue_var_store(&max_discard, page, count);
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if (ret < 0)
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return ret;
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if (max_discard & (q->limits.discard_granularity - 1))
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return -EINVAL;
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max_discard >>= 9;
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if (max_discard > UINT_MAX)
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return -EINVAL;
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if (max_discard > q->limits.max_hw_discard_sectors)
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max_discard = q->limits.max_hw_discard_sectors;
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q->limits.max_discard_sectors = max_discard;
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return ret;
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}
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static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
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{
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return queue_var_show(0, page);
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}
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static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
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{
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return sprintf(page, "%llu\n",
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(unsigned long long)q->limits.max_write_same_sectors << 9);
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}
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static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page)
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{
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return sprintf(page, "%llu\n",
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(unsigned long long)q->limits.max_write_zeroes_sectors << 9);
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}
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static ssize_t queue_zone_write_granularity_show(struct request_queue *q,
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char *page)
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{
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return queue_var_show(queue_zone_write_granularity(q), page);
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}
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static ssize_t queue_zone_append_max_show(struct request_queue *q, char *page)
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{
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unsigned long long max_sectors = q->limits.max_zone_append_sectors;
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return sprintf(page, "%llu\n", max_sectors << SECTOR_SHIFT);
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}
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static ssize_t
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queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
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{
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unsigned long max_sectors_kb,
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max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
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page_kb = 1 << (PAGE_SHIFT - 10);
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ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
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if (ret < 0)
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return ret;
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max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long)
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q->limits.max_dev_sectors >> 1);
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if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
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return -EINVAL;
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spin_lock_irq(&q->queue_lock);
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q->limits.max_sectors = max_sectors_kb << 1;
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q->backing_dev_info->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10);
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spin_unlock_irq(&q->queue_lock);
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return ret;
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}
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static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
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{
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int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
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return queue_var_show(max_hw_sectors_kb, (page));
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}
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#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
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static ssize_t \
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queue_##name##_show(struct request_queue *q, char *page) \
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{ \
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int bit; \
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bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
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return queue_var_show(neg ? !bit : bit, page); \
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} \
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static ssize_t \
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queue_##name##_store(struct request_queue *q, const char *page, size_t count) \
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{ \
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unsigned long val; \
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ssize_t ret; \
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ret = queue_var_store(&val, page, count); \
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if (ret < 0) \
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return ret; \
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if (neg) \
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val = !val; \
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\
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if (val) \
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blk_queue_flag_set(QUEUE_FLAG_##flag, q); \
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else \
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blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \
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return ret; \
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}
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QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
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QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
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QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
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QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0);
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#undef QUEUE_SYSFS_BIT_FNS
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static ssize_t queue_zoned_show(struct request_queue *q, char *page)
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{
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switch (blk_queue_zoned_model(q)) {
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case BLK_ZONED_HA:
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return sprintf(page, "host-aware\n");
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case BLK_ZONED_HM:
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return sprintf(page, "host-managed\n");
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default:
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return sprintf(page, "none\n");
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}
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}
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static ssize_t queue_nr_zones_show(struct request_queue *q, char *page)
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{
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return queue_var_show(blk_queue_nr_zones(q), page);
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}
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static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_max_open_zones(q), page);
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}
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static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_max_active_zones(q), page);
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}
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static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
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{
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return queue_var_show((blk_queue_nomerges(q) << 1) |
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blk_queue_noxmerges(q), page);
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}
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static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
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size_t count)
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{
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unsigned long nm;
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ssize_t ret = queue_var_store(&nm, page, count);
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if (ret < 0)
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return ret;
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blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
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blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
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if (nm == 2)
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blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q);
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else if (nm)
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blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
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return ret;
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}
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static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
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{
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bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
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bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
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return queue_var_show(set << force, page);
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}
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static ssize_t
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queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
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{
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ssize_t ret = -EINVAL;
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#ifdef CONFIG_SMP
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unsigned long val;
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ret = queue_var_store(&val, page, count);
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if (ret < 0)
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return ret;
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if (val == 2) {
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blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
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blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
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} else if (val == 1) {
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blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
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blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
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} else if (val == 0) {
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blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
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blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
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}
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#endif
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return ret;
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}
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static ssize_t queue_poll_delay_show(struct request_queue *q, char *page)
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{
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int val;
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if (q->poll_nsec == BLK_MQ_POLL_CLASSIC)
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val = BLK_MQ_POLL_CLASSIC;
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else
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val = q->poll_nsec / 1000;
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return sprintf(page, "%d\n", val);
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}
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static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
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size_t count)
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{
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int err, val;
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if (!q->mq_ops || !q->mq_ops->poll)
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return -EINVAL;
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err = kstrtoint(page, 10, &val);
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if (err < 0)
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return err;
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if (val == BLK_MQ_POLL_CLASSIC)
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q->poll_nsec = BLK_MQ_POLL_CLASSIC;
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else if (val >= 0)
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q->poll_nsec = val * 1000;
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else
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return -EINVAL;
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return count;
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}
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static ssize_t queue_poll_show(struct request_queue *q, char *page)
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{
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return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page);
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}
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static ssize_t queue_poll_store(struct request_queue *q, const char *page,
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size_t count)
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{
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unsigned long poll_on;
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ssize_t ret;
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if (!q->tag_set || q->tag_set->nr_maps <= HCTX_TYPE_POLL ||
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!q->tag_set->map[HCTX_TYPE_POLL].nr_queues)
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return -EINVAL;
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ret = queue_var_store(&poll_on, page, count);
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if (ret < 0)
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return ret;
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if (poll_on) {
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blk_queue_flag_set(QUEUE_FLAG_POLL, q);
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} else {
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blk_mq_freeze_queue(q);
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blk_queue_flag_clear(QUEUE_FLAG_POLL, q);
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blk_mq_unfreeze_queue(q);
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}
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return ret;
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}
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static ssize_t queue_io_timeout_show(struct request_queue *q, char *page)
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{
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return sprintf(page, "%u\n", jiffies_to_msecs(q->rq_timeout));
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}
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static ssize_t queue_io_timeout_store(struct request_queue *q, const char *page,
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size_t count)
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{
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unsigned int val;
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int err;
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err = kstrtou32(page, 10, &val);
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if (err || val == 0)
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return -EINVAL;
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blk_queue_rq_timeout(q, msecs_to_jiffies(val));
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return count;
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}
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static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
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{
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if (!wbt_rq_qos(q))
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return -EINVAL;
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return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
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}
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static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
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size_t count)
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{
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struct rq_qos *rqos;
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ssize_t ret;
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s64 val;
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ret = queue_var_store64(&val, page);
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if (ret < 0)
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return ret;
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if (val < -1)
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return -EINVAL;
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rqos = wbt_rq_qos(q);
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if (!rqos) {
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ret = wbt_init(q);
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if (ret)
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return ret;
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}
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|
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if (val == -1)
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val = wbt_default_latency_nsec(q);
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else if (val >= 0)
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val *= 1000ULL;
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|
|
if (wbt_get_min_lat(q) == val)
|
|
return count;
|
|
|
|
/*
|
|
* Ensure that the queue is idled, in case the latency update
|
|
* ends up either enabling or disabling wbt completely. We can't
|
|
* have IO inflight if that happens.
|
|
*/
|
|
blk_mq_freeze_queue(q);
|
|
blk_mq_quiesce_queue(q);
|
|
|
|
wbt_set_min_lat(q, val);
|
|
|
|
blk_mq_unquiesce_queue(q);
|
|
blk_mq_unfreeze_queue(q);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t queue_wc_show(struct request_queue *q, char *page)
|
|
{
|
|
if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
|
|
return sprintf(page, "write back\n");
|
|
|
|
return sprintf(page, "write through\n");
|
|
}
|
|
|
|
static ssize_t queue_wc_store(struct request_queue *q, const char *page,
|
|
size_t count)
|
|
{
|
|
int set = -1;
|
|
|
|
if (!strncmp(page, "write back", 10))
|
|
set = 1;
|
|
else if (!strncmp(page, "write through", 13) ||
|
|
!strncmp(page, "none", 4))
|
|
set = 0;
|
|
|
|
if (set == -1)
|
|
return -EINVAL;
|
|
|
|
if (set)
|
|
blk_queue_flag_set(QUEUE_FLAG_WC, q);
|
|
else
|
|
blk_queue_flag_clear(QUEUE_FLAG_WC, q);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t queue_fua_show(struct request_queue *q, char *page)
|
|
{
|
|
return sprintf(page, "%u\n", test_bit(QUEUE_FLAG_FUA, &q->queue_flags));
|
|
}
|
|
|
|
static ssize_t queue_dax_show(struct request_queue *q, char *page)
|
|
{
|
|
return queue_var_show(blk_queue_dax(q), page);
|
|
}
|
|
|
|
#define QUEUE_RO_ENTRY(_prefix, _name) \
|
|
static struct queue_sysfs_entry _prefix##_entry = { \
|
|
.attr = { .name = _name, .mode = 0444 }, \
|
|
.show = _prefix##_show, \
|
|
};
|
|
|
|
#define QUEUE_RW_ENTRY(_prefix, _name) \
|
|
static struct queue_sysfs_entry _prefix##_entry = { \
|
|
.attr = { .name = _name, .mode = 0644 }, \
|
|
.show = _prefix##_show, \
|
|
.store = _prefix##_store, \
|
|
};
|
|
|
|
QUEUE_RW_ENTRY(queue_requests, "nr_requests");
|
|
QUEUE_RW_ENTRY(queue_ra, "read_ahead_kb");
|
|
QUEUE_RW_ENTRY(queue_max_sectors, "max_sectors_kb");
|
|
QUEUE_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb");
|
|
QUEUE_RO_ENTRY(queue_max_segments, "max_segments");
|
|
QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments");
|
|
QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size");
|
|
QUEUE_RW_ENTRY(elv_iosched, "scheduler");
|
|
|
|
QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size");
|
|
QUEUE_RO_ENTRY(queue_physical_block_size, "physical_block_size");
|
|
QUEUE_RO_ENTRY(queue_chunk_sectors, "chunk_sectors");
|
|
QUEUE_RO_ENTRY(queue_io_min, "minimum_io_size");
|
|
QUEUE_RO_ENTRY(queue_io_opt, "optimal_io_size");
|
|
|
|
QUEUE_RO_ENTRY(queue_max_discard_segments, "max_discard_segments");
|
|
QUEUE_RO_ENTRY(queue_discard_granularity, "discard_granularity");
|
|
QUEUE_RO_ENTRY(queue_discard_max_hw, "discard_max_hw_bytes");
|
|
QUEUE_RW_ENTRY(queue_discard_max, "discard_max_bytes");
|
|
QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data");
|
|
|
|
QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes");
|
|
QUEUE_RO_ENTRY(queue_write_zeroes_max, "write_zeroes_max_bytes");
|
|
QUEUE_RO_ENTRY(queue_zone_append_max, "zone_append_max_bytes");
|
|
QUEUE_RO_ENTRY(queue_zone_write_granularity, "zone_write_granularity");
|
|
|
|
QUEUE_RO_ENTRY(queue_zoned, "zoned");
|
|
QUEUE_RO_ENTRY(queue_nr_zones, "nr_zones");
|
|
QUEUE_RO_ENTRY(queue_max_open_zones, "max_open_zones");
|
|
QUEUE_RO_ENTRY(queue_max_active_zones, "max_active_zones");
|
|
|
|
QUEUE_RW_ENTRY(queue_nomerges, "nomerges");
|
|
QUEUE_RW_ENTRY(queue_rq_affinity, "rq_affinity");
|
|
QUEUE_RW_ENTRY(queue_poll, "io_poll");
|
|
QUEUE_RW_ENTRY(queue_poll_delay, "io_poll_delay");
|
|
QUEUE_RW_ENTRY(queue_wc, "write_cache");
|
|
QUEUE_RO_ENTRY(queue_fua, "fua");
|
|
QUEUE_RO_ENTRY(queue_dax, "dax");
|
|
QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout");
|
|
QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
|
|
|
|
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
|
|
QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time");
|
|
#endif
|
|
|
|
/* legacy alias for logical_block_size: */
|
|
static struct queue_sysfs_entry queue_hw_sector_size_entry = {
|
|
.attr = {.name = "hw_sector_size", .mode = 0444 },
|
|
.show = queue_logical_block_size_show,
|
|
};
|
|
|
|
QUEUE_RW_ENTRY(queue_nonrot, "rotational");
|
|
QUEUE_RW_ENTRY(queue_iostats, "iostats");
|
|
QUEUE_RW_ENTRY(queue_random, "add_random");
|
|
QUEUE_RW_ENTRY(queue_stable_writes, "stable_writes");
|
|
|
|
static struct attribute *queue_attrs[] = {
|
|
&queue_requests_entry.attr,
|
|
&queue_ra_entry.attr,
|
|
&queue_max_hw_sectors_entry.attr,
|
|
&queue_max_sectors_entry.attr,
|
|
&queue_max_segments_entry.attr,
|
|
&queue_max_discard_segments_entry.attr,
|
|
&queue_max_integrity_segments_entry.attr,
|
|
&queue_max_segment_size_entry.attr,
|
|
&elv_iosched_entry.attr,
|
|
&queue_hw_sector_size_entry.attr,
|
|
&queue_logical_block_size_entry.attr,
|
|
&queue_physical_block_size_entry.attr,
|
|
&queue_chunk_sectors_entry.attr,
|
|
&queue_io_min_entry.attr,
|
|
&queue_io_opt_entry.attr,
|
|
&queue_discard_granularity_entry.attr,
|
|
&queue_discard_max_entry.attr,
|
|
&queue_discard_max_hw_entry.attr,
|
|
&queue_discard_zeroes_data_entry.attr,
|
|
&queue_write_same_max_entry.attr,
|
|
&queue_write_zeroes_max_entry.attr,
|
|
&queue_zone_append_max_entry.attr,
|
|
&queue_zone_write_granularity_entry.attr,
|
|
&queue_nonrot_entry.attr,
|
|
&queue_zoned_entry.attr,
|
|
&queue_nr_zones_entry.attr,
|
|
&queue_max_open_zones_entry.attr,
|
|
&queue_max_active_zones_entry.attr,
|
|
&queue_nomerges_entry.attr,
|
|
&queue_rq_affinity_entry.attr,
|
|
&queue_iostats_entry.attr,
|
|
&queue_stable_writes_entry.attr,
|
|
&queue_random_entry.attr,
|
|
&queue_poll_entry.attr,
|
|
&queue_wc_entry.attr,
|
|
&queue_fua_entry.attr,
|
|
&queue_dax_entry.attr,
|
|
&queue_wb_lat_entry.attr,
|
|
&queue_poll_delay_entry.attr,
|
|
&queue_io_timeout_entry.attr,
|
|
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
|
|
&blk_throtl_sample_time_entry.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
|
|
int n)
|
|
{
|
|
struct request_queue *q =
|
|
container_of(kobj, struct request_queue, kobj);
|
|
|
|
if (attr == &queue_io_timeout_entry.attr &&
|
|
(!q->mq_ops || !q->mq_ops->timeout))
|
|
return 0;
|
|
|
|
if ((attr == &queue_max_open_zones_entry.attr ||
|
|
attr == &queue_max_active_zones_entry.attr) &&
|
|
!blk_queue_is_zoned(q))
|
|
return 0;
|
|
|
|
return attr->mode;
|
|
}
|
|
|
|
static struct attribute_group queue_attr_group = {
|
|
.attrs = queue_attrs,
|
|
.is_visible = queue_attr_visible,
|
|
};
|
|
|
|
|
|
#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
|
|
|
|
static ssize_t
|
|
queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
|
|
{
|
|
struct queue_sysfs_entry *entry = to_queue(attr);
|
|
struct request_queue *q =
|
|
container_of(kobj, struct request_queue, kobj);
|
|
ssize_t res;
|
|
|
|
if (!entry->show)
|
|
return -EIO;
|
|
mutex_lock(&q->sysfs_lock);
|
|
res = entry->show(q, page);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
return res;
|
|
}
|
|
|
|
static ssize_t
|
|
queue_attr_store(struct kobject *kobj, struct attribute *attr,
|
|
const char *page, size_t length)
|
|
{
|
|
struct queue_sysfs_entry *entry = to_queue(attr);
|
|
struct request_queue *q;
|
|
ssize_t res;
|
|
|
|
if (!entry->store)
|
|
return -EIO;
|
|
|
|
q = container_of(kobj, struct request_queue, kobj);
|
|
mutex_lock(&q->sysfs_lock);
|
|
res = entry->store(q, page, length);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
return res;
|
|
}
|
|
|
|
static void blk_free_queue_rcu(struct rcu_head *rcu_head)
|
|
{
|
|
struct request_queue *q = container_of(rcu_head, struct request_queue,
|
|
rcu_head);
|
|
kmem_cache_free(blk_requestq_cachep, q);
|
|
}
|
|
|
|
/* Unconfigure the I/O scheduler and dissociate from the cgroup controller. */
|
|
static void blk_exit_queue(struct request_queue *q)
|
|
{
|
|
/*
|
|
* Since the I/O scheduler exit code may access cgroup information,
|
|
* perform I/O scheduler exit before disassociating from the block
|
|
* cgroup controller.
|
|
*/
|
|
if (q->elevator) {
|
|
ioc_clear_queue(q);
|
|
__elevator_exit(q, q->elevator);
|
|
}
|
|
|
|
/*
|
|
* Remove all references to @q from the block cgroup controller before
|
|
* restoring @q->queue_lock to avoid that restoring this pointer causes
|
|
* e.g. blkcg_print_blkgs() to crash.
|
|
*/
|
|
blkcg_exit_queue(q);
|
|
|
|
/*
|
|
* Since the cgroup code may dereference the @q->backing_dev_info
|
|
* pointer, only decrease its reference count after having removed the
|
|
* association with the block cgroup controller.
|
|
*/
|
|
bdi_put(q->backing_dev_info);
|
|
}
|
|
|
|
/**
|
|
* blk_release_queue - releases all allocated resources of the request_queue
|
|
* @kobj: pointer to a kobject, whose container is a request_queue
|
|
*
|
|
* This function releases all allocated resources of the request queue.
|
|
*
|
|
* The struct request_queue refcount is incremented with blk_get_queue() and
|
|
* decremented with blk_put_queue(). Once the refcount reaches 0 this function
|
|
* is called.
|
|
*
|
|
* For drivers that have a request_queue on a gendisk and added with
|
|
* __device_add_disk() the refcount to request_queue will reach 0 with
|
|
* the last put_disk() called by the driver. For drivers which don't use
|
|
* __device_add_disk() this happens with blk_cleanup_queue().
|
|
*
|
|
* Drivers exist which depend on the release of the request_queue to be
|
|
* synchronous, it should not be deferred.
|
|
*
|
|
* Context: can sleep
|
|
*/
|
|
static void blk_release_queue(struct kobject *kobj)
|
|
{
|
|
struct request_queue *q =
|
|
container_of(kobj, struct request_queue, kobj);
|
|
|
|
might_sleep();
|
|
|
|
if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags))
|
|
blk_stat_remove_callback(q, q->poll_cb);
|
|
blk_stat_free_callback(q->poll_cb);
|
|
|
|
blk_free_queue_stats(q->stats);
|
|
|
|
if (queue_is_mq(q)) {
|
|
struct blk_mq_hw_ctx *hctx;
|
|
int i;
|
|
|
|
cancel_delayed_work_sync(&q->requeue_work);
|
|
|
|
queue_for_each_hw_ctx(q, hctx, i)
|
|
cancel_delayed_work_sync(&hctx->run_work);
|
|
}
|
|
|
|
blk_exit_queue(q);
|
|
|
|
blk_queue_free_zone_bitmaps(q);
|
|
|
|
if (queue_is_mq(q))
|
|
blk_mq_release(q);
|
|
|
|
blk_trace_shutdown(q);
|
|
mutex_lock(&q->debugfs_mutex);
|
|
debugfs_remove_recursive(q->debugfs_dir);
|
|
mutex_unlock(&q->debugfs_mutex);
|
|
|
|
if (queue_is_mq(q))
|
|
blk_mq_debugfs_unregister(q);
|
|
|
|
bioset_exit(&q->bio_split);
|
|
|
|
ida_simple_remove(&blk_queue_ida, q->id);
|
|
call_rcu(&q->rcu_head, blk_free_queue_rcu);
|
|
}
|
|
|
|
static const struct sysfs_ops queue_sysfs_ops = {
|
|
.show = queue_attr_show,
|
|
.store = queue_attr_store,
|
|
};
|
|
|
|
struct kobj_type blk_queue_ktype = {
|
|
.sysfs_ops = &queue_sysfs_ops,
|
|
.release = blk_release_queue,
|
|
};
|
|
|
|
/**
|
|
* blk_register_queue - register a block layer queue with sysfs
|
|
* @disk: Disk of which the request queue should be registered with sysfs.
|
|
*/
|
|
int blk_register_queue(struct gendisk *disk)
|
|
{
|
|
int ret;
|
|
struct device *dev = disk_to_dev(disk);
|
|
struct request_queue *q = disk->queue;
|
|
|
|
if (WARN_ON(!q))
|
|
return -ENXIO;
|
|
|
|
WARN_ONCE(blk_queue_registered(q),
|
|
"%s is registering an already registered queue\n",
|
|
kobject_name(&dev->kobj));
|
|
|
|
/*
|
|
* SCSI probing may synchronously create and destroy a lot of
|
|
* request_queues for non-existent devices. Shutting down a fully
|
|
* functional queue takes measureable wallclock time as RCU grace
|
|
* periods are involved. To avoid excessive latency in these
|
|
* cases, a request_queue starts out in a degraded mode which is
|
|
* faster to shut down and is made fully functional here as
|
|
* request_queues for non-existent devices never get registered.
|
|
*/
|
|
if (!blk_queue_init_done(q)) {
|
|
blk_queue_flag_set(QUEUE_FLAG_INIT_DONE, q);
|
|
percpu_ref_switch_to_percpu(&q->q_usage_counter);
|
|
}
|
|
|
|
blk_queue_update_readahead(q);
|
|
|
|
ret = blk_trace_init_sysfs(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&q->sysfs_dir_lock);
|
|
|
|
ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
|
|
if (ret < 0) {
|
|
blk_trace_remove_sysfs(dev);
|
|
goto unlock;
|
|
}
|
|
|
|
ret = sysfs_create_group(&q->kobj, &queue_attr_group);
|
|
if (ret) {
|
|
blk_trace_remove_sysfs(dev);
|
|
kobject_del(&q->kobj);
|
|
kobject_put(&dev->kobj);
|
|
goto unlock;
|
|
}
|
|
|
|
mutex_lock(&q->debugfs_mutex);
|
|
q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
|
|
blk_debugfs_root);
|
|
mutex_unlock(&q->debugfs_mutex);
|
|
|
|
if (queue_is_mq(q)) {
|
|
__blk_mq_register_dev(dev, q);
|
|
blk_mq_debugfs_register(q);
|
|
}
|
|
|
|
mutex_lock(&q->sysfs_lock);
|
|
if (q->elevator) {
|
|
ret = elv_register_queue(q, false);
|
|
if (ret) {
|
|
mutex_unlock(&q->sysfs_lock);
|
|
mutex_unlock(&q->sysfs_dir_lock);
|
|
kobject_del(&q->kobj);
|
|
blk_trace_remove_sysfs(dev);
|
|
kobject_put(&dev->kobj);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);
|
|
wbt_enable_default(q);
|
|
blk_throtl_register_queue(q);
|
|
|
|
/* Now everything is ready and send out KOBJ_ADD uevent */
|
|
kobject_uevent(&q->kobj, KOBJ_ADD);
|
|
if (q->elevator)
|
|
kobject_uevent(&q->elevator->kobj, KOBJ_ADD);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
|
|
ret = 0;
|
|
unlock:
|
|
mutex_unlock(&q->sysfs_dir_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_register_queue);
|
|
|
|
/**
|
|
* blk_unregister_queue - counterpart of blk_register_queue()
|
|
* @disk: Disk of which the request queue should be unregistered from sysfs.
|
|
*
|
|
* Note: the caller is responsible for guaranteeing that this function is called
|
|
* after blk_register_queue() has finished.
|
|
*/
|
|
void blk_unregister_queue(struct gendisk *disk)
|
|
{
|
|
struct request_queue *q = disk->queue;
|
|
|
|
if (WARN_ON(!q))
|
|
return;
|
|
|
|
/* Return early if disk->queue was never registered. */
|
|
if (!blk_queue_registered(q))
|
|
return;
|
|
|
|
/*
|
|
* Since sysfs_remove_dir() prevents adding new directory entries
|
|
* before removal of existing entries starts, protect against
|
|
* concurrent elv_iosched_store() calls.
|
|
*/
|
|
mutex_lock(&q->sysfs_lock);
|
|
blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
|
|
mutex_lock(&q->sysfs_dir_lock);
|
|
/*
|
|
* Remove the sysfs attributes before unregistering the queue data
|
|
* structures that can be modified through sysfs.
|
|
*/
|
|
if (queue_is_mq(q))
|
|
blk_mq_unregister_dev(disk_to_dev(disk), q);
|
|
|
|
kobject_uevent(&q->kobj, KOBJ_REMOVE);
|
|
kobject_del(&q->kobj);
|
|
blk_trace_remove_sysfs(disk_to_dev(disk));
|
|
|
|
mutex_lock(&q->sysfs_lock);
|
|
if (q->elevator)
|
|
elv_unregister_queue(q);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
mutex_unlock(&q->sysfs_dir_lock);
|
|
|
|
kobject_put(&disk_to_dev(disk)->kobj);
|
|
}
|