![Jerome Marchand](/assets/img/avatar_default.png)
This forces in_flight to be zero when turning off or on the I/O stat accounting and stops updating I/O stats in attempt_merge() when accounting is turned off. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
431 lines
10 KiB
C
431 lines
10 KiB
C
/*
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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/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/blktrace_api.h>
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#include "blk.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 int var, char *page)
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{
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return sprintf(page, "%d\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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char *p = (char *) page;
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*var = simple_strtoul(p, &p, 10);
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return count;
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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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struct request_list *rl = &q->rq;
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unsigned long nr;
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int ret = queue_var_store(&nr, page, count);
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if (nr < BLKDEV_MIN_RQ)
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nr = BLKDEV_MIN_RQ;
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spin_lock_irq(q->queue_lock);
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q->nr_requests = nr;
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blk_queue_congestion_threshold(q);
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if (rl->count[BLK_RW_SYNC] >= queue_congestion_on_threshold(q))
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blk_set_queue_congested(q, BLK_RW_SYNC);
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else if (rl->count[BLK_RW_SYNC] < queue_congestion_off_threshold(q))
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blk_clear_queue_congested(q, BLK_RW_SYNC);
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if (rl->count[BLK_RW_ASYNC] >= queue_congestion_on_threshold(q))
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blk_set_queue_congested(q, BLK_RW_ASYNC);
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else if (rl->count[BLK_RW_ASYNC] < queue_congestion_off_threshold(q))
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blk_clear_queue_congested(q, BLK_RW_ASYNC);
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if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
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blk_set_queue_full(q, BLK_RW_SYNC);
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} else if (rl->count[BLK_RW_SYNC]+1 <= q->nr_requests) {
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blk_clear_queue_full(q, BLK_RW_SYNC);
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wake_up(&rl->wait[BLK_RW_SYNC]);
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}
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if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
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blk_set_queue_full(q, BLK_RW_ASYNC);
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} else if (rl->count[BLK_RW_ASYNC]+1 <= q->nr_requests) {
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blk_clear_queue_full(q, BLK_RW_ASYNC);
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wake_up(&rl->wait[BLK_RW_ASYNC]);
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}
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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_ra_show(struct request_queue *q, char *page)
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{
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int ra_kb = q->backing_dev_info.ra_pages << (PAGE_CACHE_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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q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_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 = q->max_sectors >> 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_hw_sector_size_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->hardsect_size, page);
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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 = q->max_hw_sectors >> 1,
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page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
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ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
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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->max_sectors = max_sectors_kb << 1;
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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 = q->max_hw_sectors >> 1;
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return queue_var_show(max_hw_sectors_kb, (page));
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}
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static ssize_t queue_nonrot_show(struct request_queue *q, char *page)
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{
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return queue_var_show(!blk_queue_nonrot(q), page);
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}
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static ssize_t queue_nonrot_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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spin_lock_irq(q->queue_lock);
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if (nm)
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queue_flag_clear(QUEUE_FLAG_NONROT, q);
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else
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queue_flag_set(QUEUE_FLAG_NONROT, q);
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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_nomerges_show(struct request_queue *q, char *page)
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{
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return queue_var_show(blk_queue_nomerges(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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spin_lock_irq(q->queue_lock);
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if (nm)
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queue_flag_set(QUEUE_FLAG_NOMERGES, q);
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else
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queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
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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_rq_affinity_show(struct request_queue *q, char *page)
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{
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unsigned int set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
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return queue_var_show(set != 0, 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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#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
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unsigned long val;
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ret = queue_var_store(&val, page, count);
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spin_lock_irq(q->queue_lock);
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if (val)
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queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
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else
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queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
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spin_unlock_irq(q->queue_lock);
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#endif
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return ret;
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}
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static ssize_t queue_iostats_show(struct request_queue *q, char *page)
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{
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return queue_var_show(blk_queue_io_stat(q), page);
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}
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static ssize_t queue_iostats_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 stats;
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ssize_t ret = queue_var_store(&stats, page, count);
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spin_lock_irq(q->queue_lock);
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elv_quisce_start(q);
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if (stats)
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queue_flag_set(QUEUE_FLAG_IO_STAT, q);
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else
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queue_flag_clear(QUEUE_FLAG_IO_STAT, q);
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elv_quisce_end(q);
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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 struct queue_sysfs_entry queue_requests_entry = {
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.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
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.show = queue_requests_show,
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.store = queue_requests_store,
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};
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static struct queue_sysfs_entry queue_ra_entry = {
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.attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
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.show = queue_ra_show,
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.store = queue_ra_store,
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};
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static struct queue_sysfs_entry queue_max_sectors_entry = {
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.attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
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.show = queue_max_sectors_show,
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.store = queue_max_sectors_store,
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};
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static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
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.attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
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.show = queue_max_hw_sectors_show,
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};
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static struct queue_sysfs_entry queue_iosched_entry = {
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.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
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.show = elv_iosched_show,
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.store = elv_iosched_store,
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};
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static struct queue_sysfs_entry queue_hw_sector_size_entry = {
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.attr = {.name = "hw_sector_size", .mode = S_IRUGO },
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.show = queue_hw_sector_size_show,
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};
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static struct queue_sysfs_entry queue_nonrot_entry = {
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.attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
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.show = queue_nonrot_show,
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.store = queue_nonrot_store,
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};
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static struct queue_sysfs_entry queue_nomerges_entry = {
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.attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
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.show = queue_nomerges_show,
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.store = queue_nomerges_store,
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};
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static struct queue_sysfs_entry queue_rq_affinity_entry = {
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.attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
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.show = queue_rq_affinity_show,
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.store = queue_rq_affinity_store,
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};
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static struct queue_sysfs_entry queue_iostats_entry = {
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.attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
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.show = queue_iostats_show,
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.store = queue_iostats_store,
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};
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static struct attribute *default_attrs[] = {
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&queue_requests_entry.attr,
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&queue_ra_entry.attr,
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&queue_max_hw_sectors_entry.attr,
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&queue_max_sectors_entry.attr,
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&queue_iosched_entry.attr,
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&queue_hw_sector_size_entry.attr,
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&queue_nonrot_entry.attr,
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&queue_nomerges_entry.attr,
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&queue_rq_affinity_entry.attr,
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&queue_iostats_entry.attr,
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NULL,
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};
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#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
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static ssize_t
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queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
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{
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struct queue_sysfs_entry *entry = to_queue(attr);
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struct request_queue *q =
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container_of(kobj, struct request_queue, kobj);
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ssize_t res;
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if (!entry->show)
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return -EIO;
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mutex_lock(&q->sysfs_lock);
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if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
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mutex_unlock(&q->sysfs_lock);
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return -ENOENT;
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}
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res = entry->show(q, page);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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static ssize_t
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queue_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *page, size_t length)
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{
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struct queue_sysfs_entry *entry = to_queue(attr);
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struct request_queue *q;
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ssize_t res;
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if (!entry->store)
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return -EIO;
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q = container_of(kobj, struct request_queue, kobj);
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mutex_lock(&q->sysfs_lock);
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if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
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mutex_unlock(&q->sysfs_lock);
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return -ENOENT;
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}
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res = entry->store(q, page, length);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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/**
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* blk_cleanup_queue: - release a &struct request_queue when it is no longer needed
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* @kobj: the kobj belonging of the request queue to be released
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*
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* Description:
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* blk_cleanup_queue is the pair to blk_init_queue() or
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* blk_queue_make_request(). It should be called when a request queue is
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* being released; typically when a block device is being de-registered.
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* Currently, its primary task it to free all the &struct request
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* structures that were allocated to the queue and the queue itself.
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*
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* Caveat:
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* Hopefully the low level driver will have finished any
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* outstanding requests first...
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**/
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static void blk_release_queue(struct kobject *kobj)
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{
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struct request_queue *q =
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container_of(kobj, struct request_queue, kobj);
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struct request_list *rl = &q->rq;
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blk_sync_queue(q);
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if (rl->rq_pool)
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mempool_destroy(rl->rq_pool);
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if (q->queue_tags)
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__blk_queue_free_tags(q);
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blk_trace_shutdown(q);
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bdi_destroy(&q->backing_dev_info);
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kmem_cache_free(blk_requestq_cachep, q);
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}
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static struct sysfs_ops queue_sysfs_ops = {
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.show = queue_attr_show,
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.store = queue_attr_store,
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};
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struct kobj_type blk_queue_ktype = {
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.sysfs_ops = &queue_sysfs_ops,
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.default_attrs = default_attrs,
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.release = blk_release_queue,
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};
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int blk_register_queue(struct gendisk *disk)
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{
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int ret;
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struct request_queue *q = disk->queue;
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if (WARN_ON(!q))
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return -ENXIO;
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if (!q->request_fn)
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return 0;
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ret = kobject_add(&q->kobj, kobject_get(&disk_to_dev(disk)->kobj),
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"%s", "queue");
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if (ret < 0)
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return ret;
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kobject_uevent(&q->kobj, KOBJ_ADD);
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ret = elv_register_queue(q);
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if (ret) {
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kobject_uevent(&q->kobj, KOBJ_REMOVE);
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kobject_del(&q->kobj);
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return ret;
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}
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return 0;
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}
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void blk_unregister_queue(struct gendisk *disk)
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{
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struct request_queue *q = disk->queue;
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if (WARN_ON(!q))
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return;
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if (q->request_fn) {
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elv_unregister_queue(q);
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kobject_uevent(&q->kobj, KOBJ_REMOVE);
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kobject_del(&q->kobj);
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kobject_put(&disk_to_dev(disk)->kobj);
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}
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}
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