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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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98262f2762
The discard ioctl is used by mkfs utilities to clear a block device prior to putting metadata down. However, not all devices return zeroed blocks after a discard. Some drives return stale data, potentially containing old superblocks. It is therefore important to know whether discarded blocks are properly zeroed. Both ATA and SCSI drives have configuration bits that indicate whether zeroes are returned after a discard operation. Implement a block level interface that allows this information to be bubbled up the stack and queried via a new block device ioctl. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
510 lines
13 KiB
C
510 lines
13 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 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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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;
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if (!q->request_fn)
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return -EINVAL;
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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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unsigned long ra_kb = q->backing_dev_info.ra_pages <<
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(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 = 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_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_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_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->limits.max_discard_sectors << 9, page);
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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(queue_discard_zeroes_data(q), 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 = queue_max_hw_sectors(q) >> 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->limits.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 = 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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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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bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
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return queue_var_show(set, 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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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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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_logical_block_size_show,
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};
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static struct queue_sysfs_entry queue_logical_block_size_entry = {
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.attr = {.name = "logical_block_size", .mode = S_IRUGO },
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.show = queue_logical_block_size_show,
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};
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static struct queue_sysfs_entry queue_physical_block_size_entry = {
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.attr = {.name = "physical_block_size", .mode = S_IRUGO },
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.show = queue_physical_block_size_show,
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};
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static struct queue_sysfs_entry queue_io_min_entry = {
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.attr = {.name = "minimum_io_size", .mode = S_IRUGO },
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.show = queue_io_min_show,
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};
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static struct queue_sysfs_entry queue_io_opt_entry = {
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.attr = {.name = "optimal_io_size", .mode = S_IRUGO },
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.show = queue_io_opt_show,
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};
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static struct queue_sysfs_entry queue_discard_granularity_entry = {
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.attr = {.name = "discard_granularity", .mode = S_IRUGO },
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.show = queue_discard_granularity_show,
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};
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static struct queue_sysfs_entry queue_discard_max_entry = {
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.attr = {.name = "discard_max_bytes", .mode = S_IRUGO },
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.show = queue_discard_max_show,
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};
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static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
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.attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
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.show = queue_discard_zeroes_data_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_logical_block_size_entry.attr,
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&queue_physical_block_size_entry.attr,
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&queue_io_min_entry.attr,
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&queue_io_opt_entry.attr,
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&queue_discard_granularity_entry.attr,
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&queue_discard_max_entry.attr,
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&queue_discard_zeroes_data_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 device *dev = disk_to_dev(disk);
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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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ret = blk_trace_init_sysfs(dev);
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if (ret)
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return ret;
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|
|
ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
kobject_uevent(&q->kobj, KOBJ_ADD);
|
|
|
|
if (!q->request_fn)
|
|
return 0;
|
|
|
|
ret = elv_register_queue(q);
|
|
if (ret) {
|
|
kobject_uevent(&q->kobj, KOBJ_REMOVE);
|
|
kobject_del(&q->kobj);
|
|
blk_trace_remove_sysfs(disk_to_dev(disk));
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void blk_unregister_queue(struct gendisk *disk)
|
|
{
|
|
struct request_queue *q = disk->queue;
|
|
|
|
if (WARN_ON(!q))
|
|
return;
|
|
|
|
if (q->request_fn)
|
|
elv_unregister_queue(q);
|
|
|
|
kobject_uevent(&q->kobj, KOBJ_REMOVE);
|
|
kobject_del(&q->kobj);
|
|
blk_trace_remove_sysfs(disk_to_dev(disk));
|
|
kobject_put(&disk_to_dev(disk)->kobj);
|
|
}
|