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![Tejun Heo](/assets/img/avatar_default.png)
Currently, blkg is per cgroup-queue-policy combination. This is unnatural and leads to various convolutions in partially used duplicate fields in blkg, config / stat access, and general management of blkgs. This patch make blkg's per cgroup-queue and let them serve all policies. blkgs are now created and destroyed by blkcg core proper. This will allow further consolidation of common management logic into blkcg core and API with better defined semantics and layering. As a transitional step to untangle blkg management, elvswitch and policy [de]registration, all blkgs except the root blkg are being shot down during elvswitch and bypass. This patch adds blkg_root_update() to update root blkg in place on policy change. This is hacky and racy but should be good enough as interim step until we get locking simplified and switch over to proper in-place update for all blkgs. -v2: Root blkgs need to be updated on elvswitch too and blkg_alloc() comment wasn't updated according to the function change. Fixed. Both pointed out by Vivek. -v3: v2 updated blkg_destroy_all() to invoke update_root_blkg_pd() for all policies. This freed root pd during elvswitch before the last queue finished exiting and led to oops. Directly invoke update_root_blkg_pd() only on BLKIO_POLICY_PROP from cfq_exit_queue(). This also is closer to what will be done with proper in-place blkg update. Reported by Vivek. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
567 lines
15 KiB
C
567 lines
15 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/slab.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/blktrace_api.h>
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#include "blk.h"
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#include "blk-cgroup.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 {
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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 {
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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_max_segments_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_max_segments(q), (page));
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}
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static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->limits.max_integrity_segments, (page));
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}
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static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
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{
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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_CACHE_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)
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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 sprintf(page, "%llu\n",
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(unsigned long long)q->limits.max_discard_sectors << 9);
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}
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static ssize_t queue_discard_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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#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
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static ssize_t \
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queue_show_##name(struct request_queue *q, char *page) \
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{ \
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int bit; \
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bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
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return queue_var_show(neg ? !bit : bit, page); \
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} \
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static ssize_t \
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queue_store_##name(struct request_queue *q, const char *page, size_t count) \
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{ \
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unsigned long val; \
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ssize_t ret; \
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ret = queue_var_store(&val, page, count); \
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if (neg) \
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val = !val; \
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\
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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_##flag, q); \
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else \
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queue_flag_clear(QUEUE_FLAG_##flag, 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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QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
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QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
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QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
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#undef QUEUE_SYSFS_BIT_FNS
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static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
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{
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return queue_var_show((blk_queue_nomerges(q) << 1) |
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blk_queue_noxmerges(q), page);
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}
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static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
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size_t count)
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{
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unsigned long nm;
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ssize_t ret = queue_var_store(&nm, page, count);
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spin_lock_irq(q->queue_lock);
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queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
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queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
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if (nm == 2)
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queue_flag_set(QUEUE_FLAG_NOMERGES, q);
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else if (nm)
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queue_flag_set(QUEUE_FLAG_NOXMERGES, 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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bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
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return queue_var_show(set << force, page);
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}
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static ssize_t
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queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
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{
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ssize_t ret = -EINVAL;
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#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 == 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);
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} else if (val == 1) {
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queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
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queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
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} else if (val == 0) {
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queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
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queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
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}
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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 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_max_segments_entry = {
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.attr = {.name = "max_segments", .mode = S_IRUGO },
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.show = queue_max_segments_show,
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};
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static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
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.attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
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.show = queue_max_integrity_segments_show,
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};
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static struct queue_sysfs_entry queue_max_segment_size_entry = {
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.attr = {.name = "max_segment_size", .mode = S_IRUGO },
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.show = queue_max_segment_size_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_show_nonrot,
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.store = queue_store_nonrot,
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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_show_iostats,
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.store = queue_store_iostats,
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};
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static struct queue_sysfs_entry queue_random_entry = {
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.attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
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.show = queue_show_random,
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.store = queue_store_random,
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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_max_segments_entry.attr,
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&queue_max_integrity_segments_entry.attr,
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&queue_max_segment_size_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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&queue_random_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 (blk_queue_dead(q)) {
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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,
|
|
const char *page, size_t length)
|
|
{
|
|
struct queue_sysfs_entry *entry = to_queue(attr);
|
|
struct request_queue *q;
|
|
ssize_t res;
|
|
|
|
if (!entry->store)
|
|
return -EIO;
|
|
|
|
q = container_of(kobj, struct request_queue, kobj);
|
|
mutex_lock(&q->sysfs_lock);
|
|
if (blk_queue_dead(q)) {
|
|
mutex_unlock(&q->sysfs_lock);
|
|
return -ENOENT;
|
|
}
|
|
res = entry->store(q, page, length);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* blk_release_queue: - release a &struct request_queue when it is no longer needed
|
|
* @kobj: the kobj belonging to the request queue to be released
|
|
*
|
|
* Description:
|
|
* blk_release_queue is the pair to blk_init_queue() or
|
|
* blk_queue_make_request(). It should be called when a request queue is
|
|
* being released; typically when a block device is being de-registered.
|
|
* Currently, its primary task it to free all the &struct request
|
|
* structures that were allocated to the queue and the queue itself.
|
|
*
|
|
* Caveat:
|
|
* Hopefully the low level driver will have finished any
|
|
* outstanding requests first...
|
|
**/
|
|
static void blk_release_queue(struct kobject *kobj)
|
|
{
|
|
struct request_queue *q =
|
|
container_of(kobj, struct request_queue, kobj);
|
|
struct request_list *rl = &q->rq;
|
|
|
|
blk_sync_queue(q);
|
|
|
|
blkcg_exit_queue(q);
|
|
|
|
if (q->elevator) {
|
|
spin_lock_irq(q->queue_lock);
|
|
ioc_clear_queue(q);
|
|
spin_unlock_irq(q->queue_lock);
|
|
elevator_exit(q->elevator);
|
|
}
|
|
|
|
if (rl->rq_pool)
|
|
mempool_destroy(rl->rq_pool);
|
|
|
|
if (q->queue_tags)
|
|
__blk_queue_free_tags(q);
|
|
|
|
blk_trace_shutdown(q);
|
|
|
|
bdi_destroy(&q->backing_dev_info);
|
|
|
|
ida_simple_remove(&blk_queue_ida, q->id);
|
|
kmem_cache_free(blk_requestq_cachep, q);
|
|
}
|
|
|
|
static const struct sysfs_ops queue_sysfs_ops = {
|
|
.show = queue_attr_show,
|
|
.store = queue_attr_store,
|
|
};
|
|
|
|
struct kobj_type blk_queue_ktype = {
|
|
.sysfs_ops = &queue_sysfs_ops,
|
|
.default_attrs = default_attrs,
|
|
.release = blk_release_queue,
|
|
};
|
|
|
|
int blk_register_queue(struct gendisk *disk)
|
|
{
|
|
int ret;
|
|
struct device *dev = disk_to_dev(disk);
|
|
struct request_queue *q = disk->queue;
|
|
|
|
if (WARN_ON(!q))
|
|
return -ENXIO;
|
|
|
|
ret = blk_trace_init_sysfs(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
|
|
if (ret < 0) {
|
|
blk_trace_remove_sysfs(dev);
|
|
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(dev);
|
|
kobject_put(&dev->kobj);
|
|
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);
|
|
}
|