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block/blk-sysfs.c
24.8 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * Functions related to sysfs handling */ #include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> #include <linux/bio.h> #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 "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 { struct attribute attr; ssize_t (*show)(struct request_queue *, char *); ssize_t (*store)(struct request_queue *, const char *, size_t); }; 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 ", var); |
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} static ssize_t queue_var_store(unsigned long *var, const char *page, size_t count) { |
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int err; unsigned long v; |
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err = kstrtoul(page, 10, &v); |
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if (err || v > UINT_MAX) return -EINVAL; *var = v; |
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|
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return count; } |
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static ssize_t queue_var_store64(s64 *var, const char *page) |
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{ int err; |
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s64 v; |
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|
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err = kstrtos64(page, 10, &v); |
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if (err < 0) return err; *var = v; return 0; } |
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static ssize_t queue_requests_show(struct request_queue *q, char *page) { return queue_var_show(q->nr_requests, (page)); } static ssize_t queue_requests_store(struct request_queue *q, const char *page, size_t count) { |
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unsigned long nr; |
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int ret, err; |
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|
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if (!q->request_fn && !q->mq_ops) |
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return -EINVAL; ret = queue_var_store(&nr, page, count); |
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if (ret < 0) return ret; |
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if (nr < BLKDEV_MIN_RQ) nr = BLKDEV_MIN_RQ; |
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if (q->request_fn) err = blk_update_nr_requests(q, nr); else err = blk_mq_update_nr_requests(q, nr); if (err) return err; |
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return ret; } static ssize_t queue_ra_show(struct request_queue *q, char *page) { |
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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)); } static ssize_t queue_ra_store(struct request_queue *q, const char *page, size_t count) { unsigned long ra_kb; ssize_t ret = queue_var_store(&ra_kb, page, count); |
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if (ret < 0) return ret; |
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q->backing_dev_info->ra_pages = ra_kb >> (PAGE_SHIFT - 10); |
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return ret; } static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) { |
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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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static ssize_t queue_max_segments_show(struct request_queue *q, char *page) { return queue_var_show(queue_max_segments(q), (page)); } |
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static ssize_t queue_max_discard_segments_show(struct request_queue *q, char *page) { return queue_var_show(queue_max_discard_segments(q), (page)); } |
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static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) { return queue_var_show(q->limits.max_integrity_segments, (page)); } |
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static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) { |
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if (blk_queue_cluster(q)) |
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return queue_var_show(queue_max_segment_size(q), (page)); |
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return queue_var_show(PAGE_SIZE, (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) { return queue_var_show(queue_physical_block_size(q), page); } |
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static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page) { return queue_var_show(q->limits.chunk_sectors, page); } |
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static ssize_t queue_io_min_show(struct request_queue *q, char *page) { return queue_var_show(queue_io_min(q), page); } static ssize_t queue_io_opt_show(struct request_queue *q, char *page) { 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) { return queue_var_show(q->limits.discard_granularity, page); } |
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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 ", (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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return sprintf(page, "%llu ", (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, const char *page, size_t count) { unsigned long max_discard; ssize_t ret = queue_var_store(&max_discard, page, count); if (ret < 0) return ret; if (max_discard & (q->limits.discard_granularity - 1)) return -EINVAL; max_discard >>= 9; if (max_discard > UINT_MAX) return -EINVAL; if (max_discard > q->limits.max_hw_discard_sectors) max_discard = q->limits.max_hw_discard_sectors; q->limits.max_discard_sectors = max_discard; return ret; } |
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static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) { |
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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) { return sprintf(page, "%llu ", (unsigned long long)q->limits.max_write_same_sectors << 9); } |
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static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page) { return sprintf(page, "%llu ", (unsigned long long)q->limits.max_write_zeroes_sectors << 9); } |
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|
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static ssize_t queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) { 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) return ret; |
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max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) q->limits.max_dev_sectors >> 1); |
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if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) 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); return ret; } static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) { |
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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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#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ static ssize_t \ queue_show_##name(struct request_queue *q, char *page) \ { \ int bit; \ bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ return queue_var_show(neg ? !bit : bit, page); \ } \ static ssize_t \ queue_store_##name(struct request_queue *q, const char *page, size_t count) \ { \ unsigned long val; \ ssize_t ret; \ ret = queue_var_store(&val, page, count); \ |
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if (ret < 0) \ return ret; \ |
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if (neg) \ val = !val; \ \ |
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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); QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); #undef QUEUE_SYSFS_BIT_FNS |
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|
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static ssize_t queue_zoned_show(struct request_queue *q, char *page) { switch (blk_queue_zoned_model(q)) { case BLK_ZONED_HA: return sprintf(page, "host-aware "); case BLK_ZONED_HM: return sprintf(page, "host-managed "); default: return sprintf(page, "none "); } } |
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static ssize_t queue_nomerges_show(struct request_queue *q, char *page) { |
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return queue_var_show((blk_queue_nomerges(q) << 1) | blk_queue_noxmerges(q), page); |
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} static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, size_t count) { unsigned long nm; ssize_t ret = queue_var_store(&nm, page, count); |
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if (ret < 0) return ret; |
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spin_lock_irq(q->queue_lock); |
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queue_flag_clear(QUEUE_FLAG_NOMERGES, q); queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); if (nm == 2) |
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queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
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else if (nm) queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
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spin_unlock_irq(q->queue_lock); |
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|
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return ret; } |
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static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) { |
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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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|
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return queue_var_show(set << force, page); |
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} static ssize_t queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) { ssize_t ret = -EINVAL; |
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#ifdef CONFIG_SMP |
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unsigned long val; ret = queue_var_store(&val, page, count); |
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if (ret < 0) return ret; |
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spin_lock_irq(q->queue_lock); |
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if (val == 2) { |
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queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
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queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); } else if (val == 1) { queue_flag_set(QUEUE_FLAG_SAME_COMP, q); queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); } else if (val == 0) { |
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queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); } |
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spin_unlock_irq(q->queue_lock); #endif return ret; } |
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static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) { |
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int val; if (q->poll_nsec == -1) val = -1; else val = q->poll_nsec / 1000; return sprintf(page, "%d ", val); |
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} static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, size_t count) { |
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int err, val; |
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if (!q->mq_ops || !q->mq_ops->poll) return -EINVAL; |
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err = kstrtoint(page, 10, &val); if (err < 0) return err; |
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if (val == -1) q->poll_nsec = -1; else q->poll_nsec = val * 1000; return count; |
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} |
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static ssize_t queue_poll_show(struct request_queue *q, char *page) { return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); } static ssize_t queue_poll_store(struct request_queue *q, const char *page, size_t count) { unsigned long poll_on; ssize_t ret; if (!q->mq_ops || !q->mq_ops->poll) return -EINVAL; ret = queue_var_store(&poll_on, page, count); if (ret < 0) 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_queue_flag_clear(QUEUE_FLAG_POLL, q); |
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return ret; } |
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static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) { |
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if (!wbt_rq_qos(q)) |
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return -EINVAL; |
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return sprintf(page, "%llu ", div_u64(wbt_get_min_lat(q), 1000)); |
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} static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, size_t count) { |
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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); if (ret < 0) return ret; |
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if (val < -1) return -EINVAL; |
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rqos = wbt_rq_qos(q); if (!rqos) { |
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ret = wbt_init(q); if (ret) 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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|
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/* * 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. */ if (q->mq_ops) { blk_mq_freeze_queue(q); blk_mq_quiesce_queue(q); } else blk_queue_bypass_start(q); |
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wbt_set_min_lat(q, val); |
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wbt_update_limits(q); |
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if (q->mq_ops) { blk_mq_unquiesce_queue(q); blk_mq_unfreeze_queue(q); } else blk_queue_bypass_end(q); |
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return count; } |
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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 "); return sprintf(page, "write through "); } 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; |
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if (set) |
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blk_queue_flag_set(QUEUE_FLAG_WC, q); |
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else |
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blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
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return count; } |
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static ssize_t queue_fua_show(struct request_queue *q, char *page) { return sprintf(page, "%u ", test_bit(QUEUE_FLAG_FUA, &q->queue_flags)); } |
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482 483 484 485 |
static ssize_t queue_dax_show(struct request_queue *q, char *page) { return queue_var_show(blk_queue_dax(q), page); } |
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486 |
static struct queue_sysfs_entry queue_requests_entry = { |
5657a819a block drivers/blo... |
487 |
.attr = {.name = "nr_requests", .mode = 0644 }, |
8324aa91d block: split tag ... |
488 489 490 491 492 |
.show = queue_requests_show, .store = queue_requests_store, }; static struct queue_sysfs_entry queue_ra_entry = { |
5657a819a block drivers/blo... |
493 |
.attr = {.name = "read_ahead_kb", .mode = 0644 }, |
8324aa91d block: split tag ... |
494 495 496 497 498 |
.show = queue_ra_show, .store = queue_ra_store, }; static struct queue_sysfs_entry queue_max_sectors_entry = { |
5657a819a block drivers/blo... |
499 |
.attr = {.name = "max_sectors_kb", .mode = 0644 }, |
8324aa91d block: split tag ... |
500 501 502 503 504 |
.show = queue_max_sectors_show, .store = queue_max_sectors_store, }; static struct queue_sysfs_entry queue_max_hw_sectors_entry = { |
5657a819a block drivers/blo... |
505 |
.attr = {.name = "max_hw_sectors_kb", .mode = 0444 }, |
8324aa91d block: split tag ... |
506 507 |
.show = queue_max_hw_sectors_show, }; |
c77a5710b block: Export max... |
508 |
static struct queue_sysfs_entry queue_max_segments_entry = { |
5657a819a block drivers/blo... |
509 |
.attr = {.name = "max_segments", .mode = 0444 }, |
c77a5710b block: Export max... |
510 511 |
.show = queue_max_segments_show, }; |
1e739730c block: optionally... |
512 |
static struct queue_sysfs_entry queue_max_discard_segments_entry = { |
5657a819a block drivers/blo... |
513 |
.attr = {.name = "max_discard_segments", .mode = 0444 }, |
1e739730c block: optionally... |
514 515 |
.show = queue_max_discard_segments_show, }; |
13f05c8d8 block/scsi: Provi... |
516 |
static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
5657a819a block drivers/blo... |
517 |
.attr = {.name = "max_integrity_segments", .mode = 0444 }, |
13f05c8d8 block/scsi: Provi... |
518 519 |
.show = queue_max_integrity_segments_show, }; |
c77a5710b block: Export max... |
520 |
static struct queue_sysfs_entry queue_max_segment_size_entry = { |
5657a819a block drivers/blo... |
521 |
.attr = {.name = "max_segment_size", .mode = 0444 }, |
c77a5710b block: Export max... |
522 523 |
.show = queue_max_segment_size_show, }; |
8324aa91d block: split tag ... |
524 |
static struct queue_sysfs_entry queue_iosched_entry = { |
5657a819a block drivers/blo... |
525 |
.attr = {.name = "scheduler", .mode = 0644 }, |
8324aa91d block: split tag ... |
526 527 528 |
.show = elv_iosched_show, .store = elv_iosched_store, }; |
e68b903c6 Expose hardware s... |
529 |
static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
5657a819a block drivers/blo... |
530 |
.attr = {.name = "hw_sector_size", .mode = 0444 }, |
e1defc4ff block: Do away wi... |
531 532 533 534 |
.show = queue_logical_block_size_show, }; static struct queue_sysfs_entry queue_logical_block_size_entry = { |
5657a819a block drivers/blo... |
535 |
.attr = {.name = "logical_block_size", .mode = 0444 }, |
e1defc4ff block: Do away wi... |
536 |
.show = queue_logical_block_size_show, |
e68b903c6 Expose hardware s... |
537 |
}; |
c72758f33 block: Export I/O... |
538 |
static struct queue_sysfs_entry queue_physical_block_size_entry = { |
5657a819a block drivers/blo... |
539 |
.attr = {.name = "physical_block_size", .mode = 0444 }, |
c72758f33 block: Export I/O... |
540 541 |
.show = queue_physical_block_size_show, }; |
87caf97cf blk-sysfs: Add 'c... |
542 |
static struct queue_sysfs_entry queue_chunk_sectors_entry = { |
5657a819a block drivers/blo... |
543 |
.attr = {.name = "chunk_sectors", .mode = 0444 }, |
87caf97cf blk-sysfs: Add 'c... |
544 545 |
.show = queue_chunk_sectors_show, }; |
c72758f33 block: Export I/O... |
546 |
static struct queue_sysfs_entry queue_io_min_entry = { |
5657a819a block drivers/blo... |
547 |
.attr = {.name = "minimum_io_size", .mode = 0444 }, |
c72758f33 block: Export I/O... |
548 549 550 551 |
.show = queue_io_min_show, }; static struct queue_sysfs_entry queue_io_opt_entry = { |
5657a819a block drivers/blo... |
552 |
.attr = {.name = "optimal_io_size", .mode = 0444 }, |
c72758f33 block: Export I/O... |
553 |
.show = queue_io_opt_show, |
e68b903c6 Expose hardware s... |
554 |
}; |
86b372814 block: Expose dis... |
555 |
static struct queue_sysfs_entry queue_discard_granularity_entry = { |
5657a819a block drivers/blo... |
556 |
.attr = {.name = "discard_granularity", .mode = 0444 }, |
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557 558 |
.show = queue_discard_granularity_show, }; |
0034af036 block: make /sys/... |
559 |
static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
5657a819a block drivers/blo... |
560 |
.attr = {.name = "discard_max_hw_bytes", .mode = 0444 }, |
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561 562 |
.show = queue_discard_max_hw_show, }; |
86b372814 block: Expose dis... |
563 |
static struct queue_sysfs_entry queue_discard_max_entry = { |
5657a819a block drivers/blo... |
564 |
.attr = {.name = "discard_max_bytes", .mode = 0644 }, |
86b372814 block: Expose dis... |
565 |
.show = queue_discard_max_show, |
0034af036 block: make /sys/... |
566 |
.store = queue_discard_max_store, |
86b372814 block: Expose dis... |
567 |
}; |
98262f276 block: Allow devi... |
568 |
static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
5657a819a block drivers/blo... |
569 |
.attr = {.name = "discard_zeroes_data", .mode = 0444 }, |
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570 571 |
.show = queue_discard_zeroes_data_show, }; |
4363ac7c1 block: Implement ... |
572 |
static struct queue_sysfs_entry queue_write_same_max_entry = { |
5657a819a block drivers/blo... |
573 |
.attr = {.name = "write_same_max_bytes", .mode = 0444 }, |
4363ac7c1 block: Implement ... |
574 575 |
.show = queue_write_same_max_show, }; |
a6f0788ec block: add suppor... |
576 |
static struct queue_sysfs_entry queue_write_zeroes_max_entry = { |
5657a819a block drivers/blo... |
577 |
.attr = {.name = "write_zeroes_max_bytes", .mode = 0444 }, |
a6f0788ec block: add suppor... |
578 579 |
.show = queue_write_zeroes_max_show, }; |
1308835ff block: export SSD... |
580 |
static struct queue_sysfs_entry queue_nonrot_entry = { |
5657a819a block drivers/blo... |
581 |
.attr = {.name = "rotational", .mode = 0644 }, |
956bcb7c1 block: add helper... |
582 583 |
.show = queue_show_nonrot, .store = queue_store_nonrot, |
1308835ff block: export SSD... |
584 |
}; |
797476b88 block: Add 'zoned... |
585 |
static struct queue_sysfs_entry queue_zoned_entry = { |
5657a819a block drivers/blo... |
586 |
.attr = {.name = "zoned", .mode = 0444 }, |
797476b88 block: Add 'zoned... |
587 588 |
.show = queue_zoned_show, }; |
ac9fafa12 block: Skip I/O m... |
589 |
static struct queue_sysfs_entry queue_nomerges_entry = { |
5657a819a block drivers/blo... |
590 |
.attr = {.name = "nomerges", .mode = 0644 }, |
ac9fafa12 block: Skip I/O m... |
591 592 593 |
.show = queue_nomerges_show, .store = queue_nomerges_store, }; |
c7c22e4d5 block: add suppor... |
594 |
static struct queue_sysfs_entry queue_rq_affinity_entry = { |
5657a819a block drivers/blo... |
595 |
.attr = {.name = "rq_affinity", .mode = 0644 }, |
c7c22e4d5 block: add suppor... |
596 597 598 |
.show = queue_rq_affinity_show, .store = queue_rq_affinity_store, }; |
bc58ba946 block: add sysfs ... |
599 |
static struct queue_sysfs_entry queue_iostats_entry = { |
5657a819a block drivers/blo... |
600 |
.attr = {.name = "iostats", .mode = 0644 }, |
956bcb7c1 block: add helper... |
601 602 |
.show = queue_show_iostats, .store = queue_store_iostats, |
bc58ba946 block: add sysfs ... |
603 |
}; |
e2e1a148b block: add sysfs ... |
604 |
static struct queue_sysfs_entry queue_random_entry = { |
5657a819a block drivers/blo... |
605 |
.attr = {.name = "add_random", .mode = 0644 }, |
956bcb7c1 block: add helper... |
606 607 |
.show = queue_show_random, .store = queue_store_random, |
e2e1a148b block: add sysfs ... |
608 |
}; |
05229beed block: add block ... |
609 |
static struct queue_sysfs_entry queue_poll_entry = { |
5657a819a block drivers/blo... |
610 |
.attr = {.name = "io_poll", .mode = 0644 }, |
05229beed block: add block ... |
611 612 613 |
.show = queue_poll_show, .store = queue_poll_store, }; |
06426adf0 blk-mq: implement... |
614 |
static struct queue_sysfs_entry queue_poll_delay_entry = { |
5657a819a block drivers/blo... |
615 |
.attr = {.name = "io_poll_delay", .mode = 0644 }, |
06426adf0 blk-mq: implement... |
616 617 618 |
.show = queue_poll_delay_show, .store = queue_poll_delay_store, }; |
93e9d8e83 block: add abilit... |
619 |
static struct queue_sysfs_entry queue_wc_entry = { |
5657a819a block drivers/blo... |
620 |
.attr = {.name = "write_cache", .mode = 0644 }, |
93e9d8e83 block: add abilit... |
621 622 623 |
.show = queue_wc_show, .store = queue_wc_store, }; |
6fcefbe57 block: Add sysfs ... |
624 |
static struct queue_sysfs_entry queue_fua_entry = { |
5657a819a block drivers/blo... |
625 |
.attr = {.name = "fua", .mode = 0444 }, |
6fcefbe57 block: Add sysfs ... |
626 627 |
.show = queue_fua_show, }; |
ea6ca600e block: expose QUE... |
628 |
static struct queue_sysfs_entry queue_dax_entry = { |
5657a819a block drivers/blo... |
629 |
.attr = {.name = "dax", .mode = 0444 }, |
ea6ca600e block: expose QUE... |
630 631 |
.show = queue_dax_show, }; |
87760e5ee block: hook up wr... |
632 |
static struct queue_sysfs_entry queue_wb_lat_entry = { |
5657a819a block drivers/blo... |
633 |
.attr = {.name = "wbt_lat_usec", .mode = 0644 }, |
87760e5ee block: hook up wr... |
634 635 636 |
.show = queue_wb_lat_show, .store = queue_wb_lat_store, }; |
297e3d854 blk-throttle: mak... |
637 638 |
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW static struct queue_sysfs_entry throtl_sample_time_entry = { |
5657a819a block drivers/blo... |
639 |
.attr = {.name = "throttle_sample_time", .mode = 0644 }, |
297e3d854 blk-throttle: mak... |
640 641 642 643 |
.show = blk_throtl_sample_time_show, .store = blk_throtl_sample_time_store, }; #endif |
8324aa91d block: split tag ... |
644 645 646 647 648 |
static struct attribute *default_attrs[] = { &queue_requests_entry.attr, &queue_ra_entry.attr, &queue_max_hw_sectors_entry.attr, &queue_max_sectors_entry.attr, |
c77a5710b block: Export max... |
649 |
&queue_max_segments_entry.attr, |
1e739730c block: optionally... |
650 |
&queue_max_discard_segments_entry.attr, |
13f05c8d8 block/scsi: Provi... |
651 |
&queue_max_integrity_segments_entry.attr, |
c77a5710b block: Export max... |
652 |
&queue_max_segment_size_entry.attr, |
8324aa91d block: split tag ... |
653 |
&queue_iosched_entry.attr, |
e68b903c6 Expose hardware s... |
654 |
&queue_hw_sector_size_entry.attr, |
e1defc4ff block: Do away wi... |
655 |
&queue_logical_block_size_entry.attr, |
c72758f33 block: Export I/O... |
656 |
&queue_physical_block_size_entry.attr, |
87caf97cf blk-sysfs: Add 'c... |
657 |
&queue_chunk_sectors_entry.attr, |
c72758f33 block: Export I/O... |
658 659 |
&queue_io_min_entry.attr, &queue_io_opt_entry.attr, |
86b372814 block: Expose dis... |
660 661 |
&queue_discard_granularity_entry.attr, &queue_discard_max_entry.attr, |
0034af036 block: make /sys/... |
662 |
&queue_discard_max_hw_entry.attr, |
98262f276 block: Allow devi... |
663 |
&queue_discard_zeroes_data_entry.attr, |
4363ac7c1 block: Implement ... |
664 |
&queue_write_same_max_entry.attr, |
a6f0788ec block: add suppor... |
665 |
&queue_write_zeroes_max_entry.attr, |
1308835ff block: export SSD... |
666 |
&queue_nonrot_entry.attr, |
797476b88 block: Add 'zoned... |
667 |
&queue_zoned_entry.attr, |
ac9fafa12 block: Skip I/O m... |
668 |
&queue_nomerges_entry.attr, |
c7c22e4d5 block: add suppor... |
669 |
&queue_rq_affinity_entry.attr, |
bc58ba946 block: add sysfs ... |
670 |
&queue_iostats_entry.attr, |
e2e1a148b block: add sysfs ... |
671 |
&queue_random_entry.attr, |
05229beed block: add block ... |
672 |
&queue_poll_entry.attr, |
93e9d8e83 block: add abilit... |
673 |
&queue_wc_entry.attr, |
6fcefbe57 block: Add sysfs ... |
674 |
&queue_fua_entry.attr, |
ea6ca600e block: expose QUE... |
675 |
&queue_dax_entry.attr, |
87760e5ee block: hook up wr... |
676 |
&queue_wb_lat_entry.attr, |
06426adf0 blk-mq: implement... |
677 |
&queue_poll_delay_entry.attr, |
297e3d854 blk-throttle: mak... |
678 679 680 |
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW &throtl_sample_time_entry.attr, #endif |
8324aa91d block: split tag ... |
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 |
NULL, }; #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); |
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697 |
if (blk_queue_dying(q)) { |
8324aa91d block: split tag ... |
698 699 700 701 702 703 704 705 706 707 708 709 710 |
mutex_unlock(&q->sysfs_lock); return -ENOENT; } 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); |
6728cb0e6 block: make core ... |
711 |
struct request_queue *q; |
8324aa91d block: split tag ... |
712 713 714 715 |
ssize_t res; if (!entry->store) return -EIO; |
6728cb0e6 block: make core ... |
716 717 |
q = container_of(kobj, struct request_queue, kobj); |
8324aa91d block: split tag ... |
718 |
mutex_lock(&q->sysfs_lock); |
3f3299d5c block: Rename que... |
719 |
if (blk_queue_dying(q)) { |
8324aa91d block: split tag ... |
720 721 722 723 724 725 726 |
mutex_unlock(&q->sysfs_lock); return -ENOENT; } res = entry->store(q, page, length); mutex_unlock(&q->sysfs_lock); return res; } |
548bc8e1b block: RCU free r... |
727 728 729 730 731 732 |
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); } |
8324aa91d block: split tag ... |
733 |
/** |
dc9edc44d block: Fix a blk_... |
734 735 |
* __blk_release_queue - release a request queue when it is no longer needed * @work: pointer to the release_work member of the request queue to be released |
8324aa91d block: split tag ... |
736 737 |
* * Description: |
dc9edc44d block: Fix a blk_... |
738 739 740 741 |
* blk_release_queue is the counterpart of blk_init_queue(). It should be * called when a request queue is being released; typically when a block * device is being de-registered. Its primary task it to free the queue * itself. |
8324aa91d block: split tag ... |
742 |
* |
dc9edc44d block: Fix a blk_... |
743 |
* Notes: |
45a9c9d90 blk-mq: Fix a use... |
744 745 |
* The low level driver must have finished any outstanding requests first * via blk_cleanup_queue(). |
dc9edc44d block: Fix a blk_... |
746 747 748 749 750 |
* * Although blk_release_queue() may be called with preemption disabled, * __blk_release_queue() may sleep. */ static void __blk_release_queue(struct work_struct *work) |
8324aa91d block: split tag ... |
751 |
{ |
dc9edc44d block: Fix a blk_... |
752 |
struct request_queue *q = container_of(work, typeof(*q), release_work); |
8324aa91d block: split tag ... |
753 |
|
34dbad5d2 blk-stat: convert... |
754 755 756 |
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); |
777eb1bf1 block: Free queue... |
757 |
|
24ecc3585 block: Ensure tha... |
758 759 760 761 762 763 764 765 766 767 768 |
if (!blk_queue_dead(q)) { /* * Last reference was dropped without having called * blk_cleanup_queue(). */ WARN_ONCE(blk_queue_init_done(q), "request queue %p has been registered but blk_cleanup_queue() has not been called for that queue ", q); blk_exit_queue(q); } |
b86d865cb blkcg: Make blkg_... |
769 |
WARN(blk_queue_root_blkg(q), |
24ecc3585 block: Ensure tha... |
770 771 772 |
"request queue %p is being released but it has not yet been removed from the blkcg controller ", q); |
34dbad5d2 blk-stat: convert... |
773 |
blk_free_queue_stats(q->stats); |
b425e5049 block: Avoid that... |
774 |
blk_exit_rl(q, &q->root_rl); |
8324aa91d block: split tag ... |
775 776 777 |
if (q->queue_tags) __blk_queue_free_tags(q); |
6d247d7f7 block: allow spec... |
778 779 780 |
if (!q->mq_ops) { if (q->exit_rq_fn) q->exit_rq_fn(q, q->fq->flush_rq); |
f70ced091 blk-mq: support p... |
781 |
blk_free_flush_queue(q->fq); |
6d247d7f7 block: allow spec... |
782 |
} else { |
e09aae7ed blk-mq: release m... |
783 |
blk_mq_release(q); |
6d247d7f7 block: allow spec... |
784 |
} |
18741986a blk-mq: rework fl... |
785 |
|
8324aa91d block: split tag ... |
786 |
blk_trace_shutdown(q); |
62ebce16c blk-mq: move debu... |
787 788 |
if (q->mq_ops) blk_mq_debugfs_unregister(q); |
338aa96d5 block: convert bo... |
789 |
bioset_exit(&q->bio_split); |
54efd50bf block: make gener... |
790 |
|
a73f730d0 block, cfq: move ... |
791 |
ida_simple_remove(&blk_queue_ida, q->id); |
548bc8e1b block: RCU free r... |
792 |
call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91d block: split tag ... |
793 |
} |
dc9edc44d block: Fix a blk_... |
794 795 796 797 798 799 800 801 |
static void blk_release_queue(struct kobject *kobj) { struct request_queue *q = container_of(kobj, struct request_queue, kobj); INIT_WORK(&q->release_work, __blk_release_queue); schedule_work(&q->release_work); } |
52cf25d0a Driver core: Cons... |
802 |
static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91d block: split tag ... |
803 804 805 806 807 808 809 810 811 |
.show = queue_attr_show, .store = queue_attr_store, }; struct kobj_type blk_queue_ktype = { .sysfs_ops = &queue_sysfs_ops, .default_attrs = default_attrs, .release = blk_release_queue, }; |
2c2086afc block: Protect le... |
812 813 814 815 |
/** * blk_register_queue - register a block layer queue with sysfs * @disk: Disk of which the request queue should be registered with sysfs. */ |
8324aa91d block: split tag ... |
816 817 818 |
int blk_register_queue(struct gendisk *disk) { int ret; |
1d54ad6da blktrace: add tra... |
819 |
struct device *dev = disk_to_dev(disk); |
8324aa91d block: split tag ... |
820 |
struct request_queue *q = disk->queue; |
fb1997463 block: fix blk_re... |
821 |
if (WARN_ON(!q)) |
8324aa91d block: split tag ... |
822 |
return -ENXIO; |
334335d2f block: warn if sh... |
823 824 825 826 827 |
WARN_ONCE(test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags), "%s is registering an already registered queue ", kobject_name(&dev->kobj)); queue_flag_set_unlocked(QUEUE_FLAG_REGISTERED, q); |
749fefe67 block: lift the i... |
828 |
/* |
17497acbd blk-mq, percpu_re... |
829 830 831 832 833 834 835 |
* 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. |
749fefe67 block: lift the i... |
836 |
*/ |
df35c7c91 Block: fix unbala... |
837 838 |
if (!blk_queue_init_done(q)) { queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); |
3ef28e83a block: generic re... |
839 |
percpu_ref_switch_to_percpu(&q->q_usage_counter); |
df35c7c91 Block: fix unbala... |
840 841 |
blk_queue_bypass_end(q); } |
749fefe67 block: lift the i... |
842 |
|
1d54ad6da blktrace: add tra... |
843 844 845 |
ret = blk_trace_init_sysfs(dev); if (ret) return ret; |
b410aff2b block: do not all... |
846 847 |
/* Prevent changes through sysfs until registration is completed. */ mutex_lock(&q->sysfs_lock); |
c9059598e Merge branch 'for... |
848 |
ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
ed5302d3c block, blk-sysfs:... |
849 850 |
if (ret < 0) { blk_trace_remove_sysfs(dev); |
b410aff2b block: do not all... |
851 |
goto unlock; |
ed5302d3c block, blk-sysfs:... |
852 |
} |
8324aa91d block: split tag ... |
853 |
|
a8ecdd711 blk-mq: Only regi... |
854 |
if (q->mq_ops) { |
2d0364c8c blk-mq: Register ... |
855 |
__blk_mq_register_dev(dev, q); |
a8ecdd711 blk-mq: Only regi... |
856 857 |
blk_mq_debugfs_register(q); } |
9c1051aac blk-mq: untangle ... |
858 |
|
8324aa91d block: split tag ... |
859 |
kobject_uevent(&q->kobj, KOBJ_ADD); |
8330cdb0f block: Make write... |
860 |
wbt_enable_default(q); |
87760e5ee block: hook up wr... |
861 |
|
d61fcfa4b blk-throttle: cho... |
862 |
blk_throtl_register_queue(q); |
80c6b1573 blk-mq-sched: (un... |
863 864 865 |
if (q->request_fn || (q->mq_ops && q->elevator)) { ret = elv_register_queue(q); if (ret) { |
2c2086afc block: Protect le... |
866 |
mutex_unlock(&q->sysfs_lock); |
80c6b1573 blk-mq-sched: (un... |
867 868 869 870 |
kobject_uevent(&q->kobj, KOBJ_REMOVE); kobject_del(&q->kobj); blk_trace_remove_sysfs(dev); kobject_put(&dev->kobj); |
2c2086afc block: Protect le... |
871 |
return ret; |
80c6b1573 blk-mq-sched: (un... |
872 |
} |
8324aa91d block: split tag ... |
873 |
} |
b410aff2b block: do not all... |
874 875 876 877 |
ret = 0; unlock: mutex_unlock(&q->sysfs_lock); return ret; |
8324aa91d block: split tag ... |
878 |
} |
fa70d2e2c block: allow gend... |
879 |
EXPORT_SYMBOL_GPL(blk_register_queue); |
8324aa91d block: split tag ... |
880 |
|
2c2086afc block: Protect le... |
881 882 883 884 885 886 887 |
/** * 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. */ |
8324aa91d block: split tag ... |
888 889 890 |
void blk_unregister_queue(struct gendisk *disk) { struct request_queue *q = disk->queue; |
fb1997463 block: fix blk_re... |
891 892 |
if (WARN_ON(!q)) return; |
fa70d2e2c block: allow gend... |
893 894 895 |
/* Return early if disk->queue was never registered. */ if (!test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags)) return; |
667257e8b block: properly p... |
896 |
/* |
2c2086afc block: Protect le... |
897 898 899 |
* Since sysfs_remove_dir() prevents adding new directory entries * before removal of existing entries starts, protect against * concurrent elv_iosched_store() calls. |
667257e8b block: properly p... |
900 |
*/ |
e9a823fb3 block: fix warnin... |
901 |
mutex_lock(&q->sysfs_lock); |
334335d2f block: warn if sh... |
902 |
|
8814ce8a0 block: Introduce ... |
903 |
blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q); |
02ba8893a block: fix leak o... |
904 |
|
2c2086afc block: Protect le... |
905 906 907 908 |
/* * Remove the sysfs attributes before unregistering the queue data * structures that can be modified through sysfs. */ |
320ae51fe blk-mq: new multi... |
909 |
if (q->mq_ops) |
b21d5b301 blk-mq: register ... |
910 |
blk_mq_unregister_dev(disk_to_dev(disk), q); |
2c2086afc block: Protect le... |
911 |
mutex_unlock(&q->sysfs_lock); |
8324aa91d block: split tag ... |
912 |
|
48c0d4d4c Add missing blk_t... |
913 914 915 |
kobject_uevent(&q->kobj, KOBJ_REMOVE); kobject_del(&q->kobj); blk_trace_remove_sysfs(disk_to_dev(disk)); |
667257e8b block: properly p... |
916 |
|
a79050434 blk-rq-qos: refac... |
917 |
rq_qos_exit(q); |
2c2086afc block: Protect le... |
918 919 920 921 |
mutex_lock(&q->sysfs_lock); if (q->request_fn || (q->mq_ops && q->elevator)) elv_unregister_queue(q); |
667257e8b block: properly p... |
922 |
mutex_unlock(&q->sysfs_lock); |
2c2086afc block: Protect le... |
923 924 |
kobject_put(&disk_to_dev(disk)->kobj); |
8324aa91d block: split tag ... |
925 |
} |