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-rw-r--r--block/Kconfig.iosched6
-rw-r--r--block/Makefile2
-rw-r--r--block/blk-cgroup.c14
-rw-r--r--block/blk-core.c1
-rw-r--r--block/blk-flush.c13
-rw-r--r--block/blk-iocost.c8
-rw-r--r--block/blk-iolatency.c6
-rw-r--r--block/blk-mq.c40
-rw-r--r--block/blk.h6
-rw-r--r--block/kyber-iosched.c2
-rw-r--r--block/mq-deadline-cgroup.c124
-rw-r--r--block/mq-deadline-cgroup.h114
-rw-r--r--block/mq-deadline.c (renamed from block/mq-deadline-main.c)119
-rw-r--r--block/partitions/ldm.c2
14 files changed, 68 insertions, 389 deletions
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 64053d67a97b..2f2158e05a91 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -9,12 +9,6 @@ config MQ_IOSCHED_DEADLINE
help
MQ version of the deadline IO scheduler.
-config MQ_IOSCHED_DEADLINE_CGROUP
- tristate
- default y
- depends on MQ_IOSCHED_DEADLINE
- depends on BLK_CGROUP
-
config MQ_IOSCHED_KYBER
tristate "Kyber I/O scheduler"
default y
diff --git a/block/Makefile b/block/Makefile
index 0d951adce796..1d0d466f2182 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -22,8 +22,6 @@ obj-$(CONFIG_BLK_CGROUP_IOPRIO) += blk-ioprio.o
obj-$(CONFIG_BLK_CGROUP_IOLATENCY) += blk-iolatency.o
obj-$(CONFIG_BLK_CGROUP_IOCOST) += blk-iocost.o
obj-$(CONFIG_MQ_IOSCHED_DEADLINE) += mq-deadline.o
-mq-deadline-y += mq-deadline-main.o
-mq-deadline-$(CONFIG_MQ_IOSCHED_DEADLINE_CGROUP)+= mq-deadline-cgroup.o
obj-$(CONFIG_MQ_IOSCHED_KYBER) += kyber-iosched.o
bfq-y := bfq-iosched.o bfq-wf2q.o bfq-cgroup.o
obj-$(CONFIG_IOSCHED_BFQ) += bfq.o
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index f575aa42922b..3c88a79a319b 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -789,6 +789,7 @@ static void blkcg_rstat_flush(struct cgroup_subsys_state *css, int cpu)
struct blkcg_gq *parent = blkg->parent;
struct blkg_iostat_set *bisc = per_cpu_ptr(blkg->iostat_cpu, cpu);
struct blkg_iostat cur, delta;
+ unsigned long flags;
unsigned int seq;
/* fetch the current per-cpu values */
@@ -798,21 +799,21 @@ static void blkcg_rstat_flush(struct cgroup_subsys_state *css, int cpu)
} while (u64_stats_fetch_retry(&bisc->sync, seq));
/* propagate percpu delta to global */
- u64_stats_update_begin(&blkg->iostat.sync);
+ flags = u64_stats_update_begin_irqsave(&blkg->iostat.sync);
blkg_iostat_set(&delta, &cur);
blkg_iostat_sub(&delta, &bisc->last);
blkg_iostat_add(&blkg->iostat.cur, &delta);
blkg_iostat_add(&bisc->last, &delta);
- u64_stats_update_end(&blkg->iostat.sync);
+ u64_stats_update_end_irqrestore(&blkg->iostat.sync, flags);
/* propagate global delta to parent (unless that's root) */
if (parent && parent->parent) {
- u64_stats_update_begin(&parent->iostat.sync);
+ flags = u64_stats_update_begin_irqsave(&parent->iostat.sync);
blkg_iostat_set(&delta, &blkg->iostat.cur);
blkg_iostat_sub(&delta, &blkg->iostat.last);
blkg_iostat_add(&parent->iostat.cur, &delta);
blkg_iostat_add(&blkg->iostat.last, &delta);
- u64_stats_update_end(&parent->iostat.sync);
+ u64_stats_update_end_irqrestore(&parent->iostat.sync, flags);
}
}
@@ -847,6 +848,7 @@ static void blkcg_fill_root_iostats(void)
memset(&tmp, 0, sizeof(tmp));
for_each_possible_cpu(cpu) {
struct disk_stats *cpu_dkstats;
+ unsigned long flags;
cpu_dkstats = per_cpu_ptr(bdev->bd_stats, cpu);
tmp.ios[BLKG_IOSTAT_READ] +=
@@ -863,9 +865,9 @@ static void blkcg_fill_root_iostats(void)
tmp.bytes[BLKG_IOSTAT_DISCARD] +=
cpu_dkstats->sectors[STAT_DISCARD] << 9;
- u64_stats_update_begin(&blkg->iostat.sync);
+ flags = u64_stats_update_begin_irqsave(&blkg->iostat.sync);
blkg_iostat_set(&blkg->iostat.cur, &tmp);
- u64_stats_update_end(&blkg->iostat.sync);
+ u64_stats_update_end_irqrestore(&blkg->iostat.sync, flags);
}
}
}
diff --git a/block/blk-core.c b/block/blk-core.c
index 0874bc2fcdb4..b5098739f72a 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -121,7 +121,6 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
rq->internal_tag = BLK_MQ_NO_TAG;
rq->start_time_ns = ktime_get_ns();
rq->part = NULL;
- refcount_set(&rq->ref, 1);
blk_crypto_rq_set_defaults(rq);
}
EXPORT_SYMBOL(blk_rq_init);
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 1002f6c58181..4201728bf3a5 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -262,6 +262,11 @@ static void flush_end_io(struct request *flush_rq, blk_status_t error)
spin_unlock_irqrestore(&fq->mq_flush_lock, flags);
}
+bool is_flush_rq(struct request *rq)
+{
+ return rq->end_io == flush_end_io;
+}
+
/**
* blk_kick_flush - consider issuing flush request
* @q: request_queue being kicked
@@ -329,6 +334,14 @@ static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq,
flush_rq->rq_flags |= RQF_FLUSH_SEQ;
flush_rq->rq_disk = first_rq->rq_disk;
flush_rq->end_io = flush_end_io;
+ /*
+ * Order WRITE ->end_io and WRITE rq->ref, and its pair is the one
+ * implied in refcount_inc_not_zero() called from
+ * blk_mq_find_and_get_req(), which orders WRITE/READ flush_rq->ref
+ * and READ flush_rq->end_io
+ */
+ smp_wmb();
+ refcount_set(&flush_rq->ref, 1);
blk_flush_queue_rq(flush_rq, false);
}
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 89b21a360b2c..b3880e4ba22a 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3056,19 +3056,19 @@ static ssize_t ioc_weight_write(struct kernfs_open_file *of, char *buf,
if (v < CGROUP_WEIGHT_MIN || v > CGROUP_WEIGHT_MAX)
return -EINVAL;
- spin_lock(&blkcg->lock);
+ spin_lock_irq(&blkcg->lock);
iocc->dfl_weight = v * WEIGHT_ONE;
hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) {
struct ioc_gq *iocg = blkg_to_iocg(blkg);
if (iocg) {
- spin_lock_irq(&iocg->ioc->lock);
+ spin_lock(&iocg->ioc->lock);
ioc_now(iocg->ioc, &now);
weight_updated(iocg, &now);
- spin_unlock_irq(&iocg->ioc->lock);
+ spin_unlock(&iocg->ioc->lock);
}
}
- spin_unlock(&blkcg->lock);
+ spin_unlock_irq(&blkcg->lock);
return nbytes;
}
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index 4c06fafb7411..c0545f9da549 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -833,7 +833,11 @@ static ssize_t iolatency_set_limit(struct kernfs_open_file *of, char *buf,
enable = iolatency_set_min_lat_nsec(blkg, lat_val);
if (enable) {
- WARN_ON_ONCE(!blk_get_queue(blkg->q));
+ if (!blk_get_queue(blkg->q)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
blkg_get(blkg);
}
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0a33d16a7298..944049982e6e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -606,7 +606,7 @@ static inline bool blk_mq_complete_need_ipi(struct request *rq)
* This is probably worse than completing the request on a different
* cache domain.
*/
- if (force_irqthreads)
+ if (force_irqthreads())
return false;
/* same CPU or cache domain? Complete locally */
@@ -911,7 +911,7 @@ static bool blk_mq_req_expired(struct request *rq, unsigned long *next)
void blk_mq_put_rq_ref(struct request *rq)
{
- if (is_flush_rq(rq, rq->mq_hctx))
+ if (is_flush_rq(rq))
rq->end_io(rq, 0);
else if (refcount_dec_and_test(&rq->ref))
__blk_mq_free_request(rq);
@@ -923,34 +923,14 @@ static bool blk_mq_check_expired(struct blk_mq_hw_ctx *hctx,
unsigned long *next = priv;
/*
- * Just do a quick check if it is expired before locking the request in
- * so we're not unnecessarilly synchronizing across CPUs.
- */
- if (!blk_mq_req_expired(rq, next))
- return true;
-
- /*
- * We have reason to believe the request may be expired. Take a
- * reference on the request to lock this request lifetime into its
- * currently allocated context to prevent it from being reallocated in
- * the event the completion by-passes this timeout handler.
- *
- * If the reference was already released, then the driver beat the
- * timeout handler to posting a natural completion.
- */
- if (!refcount_inc_not_zero(&rq->ref))
- return true;
-
- /*
- * The request is now locked and cannot be reallocated underneath the
- * timeout handler's processing. Re-verify this exact request is truly
- * expired; if it is not expired, then the request was completed and
- * reallocated as a new request.
+ * blk_mq_queue_tag_busy_iter() has locked the request, so it cannot
+ * be reallocated underneath the timeout handler's processing, then
+ * the expire check is reliable. If the request is not expired, then
+ * it was completed and reallocated as a new request after returning
+ * from blk_mq_check_expired().
*/
if (blk_mq_req_expired(rq, next))
blk_mq_rq_timed_out(rq, reserved);
-
- blk_mq_put_rq_ref(rq);
return true;
}
@@ -2994,10 +2974,12 @@ static void queue_set_hctx_shared(struct request_queue *q, bool shared)
int i;
queue_for_each_hw_ctx(q, hctx, i) {
- if (shared)
+ if (shared) {
hctx->flags |= BLK_MQ_F_TAG_QUEUE_SHARED;
- else
+ } else {
+ blk_mq_tag_idle(hctx);
hctx->flags &= ~BLK_MQ_F_TAG_QUEUE_SHARED;
+ }
}
}
diff --git a/block/blk.h b/block/blk.h
index bbbcc1a64a2d..346d184c82b0 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -44,11 +44,7 @@ static inline void __blk_get_queue(struct request_queue *q)
kobject_get(&q->kobj);
}
-static inline bool
-is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
-{
- return hctx->fq->flush_rq == req;
-}
+bool is_flush_rq(struct request *req);
struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
gfp_t flags);
diff --git a/block/kyber-iosched.c b/block/kyber-iosched.c
index 81e3279ecd57..15a8be57203d 100644
--- a/block/kyber-iosched.c
+++ b/block/kyber-iosched.c
@@ -596,13 +596,13 @@ static void kyber_insert_requests(struct blk_mq_hw_ctx *hctx,
struct list_head *head = &kcq->rq_list[sched_domain];
spin_lock(&kcq->lock);
+ trace_block_rq_insert(rq);
if (at_head)
list_move(&rq->queuelist, head);
else
list_move_tail(&rq->queuelist, head);
sbitmap_set_bit(&khd->kcq_map[sched_domain],
rq->mq_ctx->index_hw[hctx->type]);
- trace_block_rq_insert(rq);
spin_unlock(&kcq->lock);
}
}
diff --git a/block/mq-deadline-cgroup.c b/block/mq-deadline-cgroup.c
deleted file mode 100644
index b48a4b962f90..000000000000
--- a/block/mq-deadline-cgroup.c
+++ /dev/null
@@ -1,124 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/blk-cgroup.h>
-#include <linux/ioprio.h>
-
-#include "mq-deadline-cgroup.h"
-
-static struct blkcg_policy dd_blkcg_policy;
-
-static struct blkcg_policy_data *dd_cpd_alloc(gfp_t gfp)
-{
- struct dd_blkcg *pd;
-
- pd = kzalloc(sizeof(*pd), gfp);
- if (!pd)
- return NULL;
- pd->stats = alloc_percpu_gfp(typeof(*pd->stats),
- GFP_KERNEL | __GFP_ZERO);
- if (!pd->stats) {
- kfree(pd);
- return NULL;
- }
- return &pd->cpd;
-}
-
-static void dd_cpd_free(struct blkcg_policy_data *cpd)
-{
- struct dd_blkcg *dd_blkcg = container_of(cpd, typeof(*dd_blkcg), cpd);
-
- free_percpu(dd_blkcg->stats);
- kfree(dd_blkcg);
-}
-
-static struct dd_blkcg *dd_blkcg_from_pd(struct blkg_policy_data *pd)
-{
- return container_of(blkcg_to_cpd(pd->blkg->blkcg, &dd_blkcg_policy),
- struct dd_blkcg, cpd);
-}
-
-/*
- * Convert an association between a block cgroup and a request queue into a
- * pointer to the mq-deadline information associated with a (blkcg, queue) pair.
- */
-struct dd_blkcg *dd_blkcg_from_bio(struct bio *bio)
-{
- struct blkg_policy_data *pd;
-
- pd = blkg_to_pd(bio->bi_blkg, &dd_blkcg_policy);
- if (!pd)
- return NULL;
-
- return dd_blkcg_from_pd(pd);
-}
-
-static bool dd_pd_stat(struct blkg_policy_data *pd, struct seq_file *s)
-{
- static const char *const prio_class_name[] = {
- [IOPRIO_CLASS_NONE] = "NONE",
- [IOPRIO_CLASS_RT] = "RT",
- [IOPRIO_CLASS_BE] = "BE",
- [IOPRIO_CLASS_IDLE] = "IDLE",
- };
- struct dd_blkcg *blkcg = dd_blkcg_from_pd(pd);
- u8 prio;
-
- for (prio = 0; prio < ARRAY_SIZE(blkcg->stats->stats); prio++)
- seq_printf(s, " [%s] dispatched=%u inserted=%u merged=%u",
- prio_class_name[prio],
- ddcg_sum(blkcg, dispatched, prio) +
- ddcg_sum(blkcg, merged, prio) -
- ddcg_sum(blkcg, completed, prio),
- ddcg_sum(blkcg, inserted, prio) -
- ddcg_sum(blkcg, completed, prio),
- ddcg_sum(blkcg, merged, prio));
-
- return true;
-}
-
-static struct blkg_policy_data *dd_pd_alloc(gfp_t gfp, struct request_queue *q,
- struct blkcg *blkcg)
-{
- struct dd_blkg *pd;
-
- pd = kzalloc(sizeof(*pd), gfp);
- if (!pd)
- return NULL;
- return &pd->pd;
-}
-
-static void dd_pd_free(struct blkg_policy_data *pd)
-{
- struct dd_blkg *dd_blkg = container_of(pd, typeof(*dd_blkg), pd);
-
- kfree(dd_blkg);
-}
-
-static struct blkcg_policy dd_blkcg_policy = {
- .cpd_alloc_fn = dd_cpd_alloc,
- .cpd_free_fn = dd_cpd_free,
-
- .pd_alloc_fn = dd_pd_alloc,
- .pd_free_fn = dd_pd_free,
- .pd_stat_fn = dd_pd_stat,
-};
-
-int dd_activate_policy(struct request_queue *q)
-{
- return blkcg_activate_policy(q, &dd_blkcg_policy);
-}
-
-void dd_deactivate_policy(struct request_queue *q)
-{
- blkcg_deactivate_policy(q, &dd_blkcg_policy);
-}
-
-int __init dd_blkcg_init(void)
-{
- return blkcg_policy_register(&dd_blkcg_policy);
-}
-
-void __exit dd_blkcg_exit(void)
-{
- blkcg_policy_unregister(&dd_blkcg_policy);
-}
diff --git a/block/mq-deadline-cgroup.h b/block/mq-deadline-cgroup.h
deleted file mode 100644
index 0143fd74f3ce..000000000000
--- a/block/mq-deadline-cgroup.h
+++ /dev/null
@@ -1,114 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-#if !defined(_MQ_DEADLINE_CGROUP_H_)
-#define _MQ_DEADLINE_CGROUP_H_
-
-#include <linux/blk-cgroup.h>
-
-struct request_queue;
-
-/**
- * struct io_stats_per_prio - I/O statistics per I/O priority class.
- * @inserted: Number of inserted requests.
- * @merged: Number of merged requests.
- * @dispatched: Number of dispatched requests.
- * @completed: Number of I/O completions.
- */
-struct io_stats_per_prio {
- local_t inserted;
- local_t merged;
- local_t dispatched;
- local_t completed;
-};
-
-/* I/O statistics per I/O cgroup per I/O priority class (IOPRIO_CLASS_*). */
-struct blkcg_io_stats {
- struct io_stats_per_prio stats[4];
-};
-
-/**
- * struct dd_blkcg - Per cgroup data.
- * @cpd: blkcg_policy_data structure.
- * @stats: I/O statistics.
- */
-struct dd_blkcg {
- struct blkcg_policy_data cpd; /* must be the first member */
- struct blkcg_io_stats __percpu *stats;
-};
-
-/*
- * Count one event of type 'event_type' and with I/O priority class
- * 'prio_class'.
- */
-#define ddcg_count(ddcg, event_type, prio_class) do { \
-if (ddcg) { \
- struct blkcg_io_stats *io_stats = get_cpu_ptr((ddcg)->stats); \
- \
- BUILD_BUG_ON(!__same_type((ddcg), struct dd_blkcg *)); \
- BUILD_BUG_ON(!__same_type((prio_class), u8)); \
- local_inc(&io_stats->stats[(prio_class)].event_type); \
- put_cpu_ptr(io_stats); \
-} \
-} while (0)
-
-/*
- * Returns the total number of ddcg_count(ddcg, event_type, prio_class) calls
- * across all CPUs. No locking or barriers since it is fine if the returned
- * sum is slightly outdated.
- */
-#define ddcg_sum(ddcg, event_type, prio) ({ \
- unsigned int cpu; \
- u32 sum = 0; \
- \
- BUILD_BUG_ON(!__same_type((ddcg), struct dd_blkcg *)); \
- BUILD_BUG_ON(!__same_type((prio), u8)); \
- for_each_present_cpu(cpu) \
- sum += local_read(&per_cpu_ptr((ddcg)->stats, cpu)-> \
- stats[(prio)].event_type); \
- sum; \
-})
-
-#ifdef CONFIG_BLK_CGROUP
-
-/**
- * struct dd_blkg - Per (cgroup, request queue) data.
- * @pd: blkg_policy_data structure.
- */
-struct dd_blkg {
- struct blkg_policy_data pd; /* must be the first member */
-};
-
-struct dd_blkcg *dd_blkcg_from_bio(struct bio *bio);
-int dd_activate_policy(struct request_queue *q);
-void dd_deactivate_policy(struct request_queue *q);
-int __init dd_blkcg_init(void);
-void __exit dd_blkcg_exit(void);
-
-#else /* CONFIG_BLK_CGROUP */
-
-static inline struct dd_blkcg *dd_blkcg_from_bio(struct bio *bio)
-{
- return NULL;
-}
-
-static inline int dd_activate_policy(struct request_queue *q)
-{
- return 0;
-}
-
-static inline void dd_deactivate_policy(struct request_queue *q)
-{
-}
-
-static inline int dd_blkcg_init(void)
-{
- return 0;
-}
-
-static inline void dd_blkcg_exit(void)
-{
-}
-
-#endif /* CONFIG_BLK_CGROUP */
-
-#endif /* _MQ_DEADLINE_CGROUP_H_ */
diff --git a/block/mq-deadline-main.c b/block/mq-deadline.c
index 294be0c0db65..3c3693c34f06 100644
--- a/block/mq-deadline-main.c
+++ b/block/mq-deadline.c
@@ -25,18 +25,12 @@
#include "blk-mq-debugfs.h"
#include "blk-mq-tag.h"
#include "blk-mq-sched.h"
-#include "mq-deadline-cgroup.h"
/*
* See Documentation/block/deadline-iosched.rst
*/
static const int read_expire = HZ / 2; /* max time before a read is submitted. */
static const int write_expire = 5 * HZ; /* ditto for writes, these limits are SOFT! */
-/*
- * Time after which to dispatch lower priority requests even if higher
- * priority requests are pending.
- */
-static const int aging_expire = 10 * HZ;
static const int writes_starved = 2; /* max times reads can starve a write */
static const int fifo_batch = 16; /* # of sequential requests treated as one
by the above parameters. For throughput. */
@@ -57,6 +51,14 @@ enum dd_prio {
enum { DD_PRIO_COUNT = 3 };
+/* I/O statistics per I/O priority. */
+struct io_stats_per_prio {
+ local_t inserted;
+ local_t merged;
+ local_t dispatched;
+ local_t completed;
+};
+
/* I/O statistics for all I/O priorities (enum dd_prio). */
struct io_stats {
struct io_stats_per_prio stats[DD_PRIO_COUNT];
@@ -79,9 +81,6 @@ struct deadline_data {
* run time data
*/
- /* Request queue that owns this data structure. */
- struct request_queue *queue;
-
struct dd_per_prio per_prio[DD_PRIO_COUNT];
/* Data direction of latest dispatched request. */
@@ -99,7 +98,6 @@ struct deadline_data {
int writes_starved;
int front_merges;
u32 async_depth;
- int aging_expire;
spinlock_t lock;
spinlock_t zone_lock;
@@ -234,10 +232,8 @@ static void dd_merged_requests(struct request_queue *q, struct request *req,
struct deadline_data *dd = q->elevator->elevator_data;
const u8 ioprio_class = dd_rq_ioclass(next);
const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
- struct dd_blkcg *blkcg = next->elv.priv[0];
dd_count(dd, merged, prio);
- ddcg_count(blkcg, merged, ioprio_class);
/*
* if next expires before rq, assign its expire time to rq
@@ -367,15 +363,13 @@ deadline_next_request(struct deadline_data *dd, struct dd_per_prio *per_prio,
/*
* deadline_dispatch_requests selects the best request according to
- * read/write expire, fifo_batch, etc and with a start time <= @latest.
+ * read/write expire, fifo_batch, etc
*/
static struct request *__dd_dispatch_request(struct deadline_data *dd,
- struct dd_per_prio *per_prio,
- u64 latest_start_ns)
+ struct dd_per_prio *per_prio)
{
struct request *rq, *next_rq;
enum dd_data_dir data_dir;
- struct dd_blkcg *blkcg;
enum dd_prio prio;
u8 ioprio_class;
@@ -384,8 +378,6 @@ static struct request *__dd_dispatch_request(struct deadline_data *dd,
if (!list_empty(&per_prio->dispatch)) {
rq = list_first_entry(&per_prio->dispatch, struct request,
queuelist);
- if (rq->start_time_ns > latest_start_ns)
- return NULL;
list_del_init(&rq->queuelist);
goto done;
}
@@ -463,8 +455,6 @@ dispatch_find_request:
dd->batching = 0;
dispatch_request:
- if (rq->start_time_ns > latest_start_ns)
- return NULL;
/*
* rq is the selected appropriate request.
*/
@@ -474,8 +464,6 @@ done:
ioprio_class = dd_rq_ioclass(rq);
prio = ioprio_class_to_prio[ioprio_class];
dd_count(dd, dispatched, prio);
- blkcg = rq->elv.priv[0];
- ddcg_count(blkcg, dispatched, ioprio_class);
/*
* If the request needs its target zone locked, do it.
*/
@@ -495,32 +483,15 @@ done:
static struct request *dd_dispatch_request(struct blk_mq_hw_ctx *hctx)
{
struct deadline_data *dd = hctx->queue->elevator->elevator_data;
- const u64 now_ns = ktime_get_ns();
- struct request *rq = NULL;
+ struct request *rq;
enum dd_prio prio;
spin_lock(&dd->lock);
- /*
- * Start with dispatching requests whose deadline expired more than
- * aging_expire jiffies ago.
- */
- for (prio = DD_BE_PRIO; prio <= DD_PRIO_MAX; prio++) {
- rq = __dd_dispatch_request(dd, &dd->per_prio[prio], now_ns -
- jiffies_to_nsecs(dd->aging_expire));
- if (rq)
- goto unlock;
- }
- /*
- * Next, dispatch requests in priority order. Ignore lower priority
- * requests if any higher priority requests are pending.
- */
for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
- rq = __dd_dispatch_request(dd, &dd->per_prio[prio], now_ns);
- if (rq || dd_queued(dd, prio))
+ rq = __dd_dispatch_request(dd, &dd->per_prio[prio]);
+ if (rq)
break;
}
-
-unlock:
spin_unlock(&dd->lock);
return rq;
@@ -569,8 +540,6 @@ static void dd_exit_sched(struct elevator_queue *e)
struct deadline_data *dd = e->elevator_data;
enum dd_prio prio;
- dd_deactivate_policy(dd->queue);
-
for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
struct dd_per_prio *per_prio = &dd->per_prio[prio];
@@ -584,7 +553,7 @@ static void dd_exit_sched(struct elevator_queue *e)
}
/*
- * Initialize elevator private data (deadline_data) and associate with blkcg.
+ * initialize elevator private data (deadline_data).
*/
static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
{
@@ -593,12 +562,6 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
enum dd_prio prio;
int ret = -ENOMEM;
- /*
- * Initialization would be very tricky if the queue is not frozen,
- * hence the warning statement below.
- */
- WARN_ON_ONCE(!percpu_ref_is_zero(&q->q_usage_counter));
-
eq = elevator_alloc(q, e);
if (!eq)
return ret;
@@ -614,8 +577,6 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
if (!dd->stats)
goto free_dd;
- dd->queue = q;
-
for (prio = 0; prio <= DD_PRIO_MAX; prio++) {
struct dd_per_prio *per_prio = &dd->per_prio[prio];
@@ -631,21 +592,12 @@ static int dd_init_sched(struct request_queue *q, struct elevator_type *e)
dd->front_merges = 1;
dd->last_dir = DD_WRITE;
dd->fifo_batch = fifo_batch;
- dd->aging_expire = aging_expire;
spin_lock_init(&dd->lock);
spin_lock_init(&dd->zone_lock);
- ret = dd_activate_policy(q);
- if (ret)
- goto free_stats;
-
- ret = 0;
q->elevator = eq;
return 0;
-free_stats:
- free_percpu(dd->stats);
-
free_dd:
kfree(dd);
@@ -720,7 +672,6 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
u8 ioprio_class = IOPRIO_PRIO_CLASS(ioprio);
struct dd_per_prio *per_prio;
enum dd_prio prio;
- struct dd_blkcg *blkcg;
LIST_HEAD(free);
lockdep_assert_held(&dd->lock);
@@ -731,18 +682,9 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
*/
blk_req_zone_write_unlock(rq);
- /*
- * If a block cgroup has been associated with the submitter and if an
- * I/O priority has been set in the associated block cgroup, use the
- * lowest of the cgroup priority and the request priority for the
- * request. If no priority has been set in the request, use the cgroup
- * priority.
- */
prio = ioprio_class_to_prio[ioprio_class];
dd_count(dd, inserted, prio);
- blkcg = dd_blkcg_from_bio(rq->bio);
- ddcg_count(blkcg, inserted, ioprio_class);
- rq->elv.priv[0] = blkcg;
+ rq->elv.priv[0] = (void *)(uintptr_t)1;
if (blk_mq_sched_try_insert_merge(q, rq, &free)) {
blk_mq_free_requests(&free);
@@ -817,13 +759,18 @@ static void dd_finish_request(struct request *rq)
{
struct request_queue *q = rq->q;
struct deadline_data *dd = q->elevator->elevator_data;
- struct dd_blkcg *blkcg = rq->elv.priv[0];
const u8 ioprio_class = dd_rq_ioclass(rq);
const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
struct dd_per_prio *per_prio = &dd->per_prio[prio];
- dd_count(dd, completed, prio);
- ddcg_count(blkcg, completed, ioprio_class);
+ /*
+ * The block layer core may call dd_finish_request() without having
+ * called dd_insert_requests(). Hence only update statistics for
+ * requests for which dd_insert_requests() has been called. See also
+ * blk_mq_request_bypass_insert().
+ */
+ if (rq->elv.priv[0])
+ dd_count(dd, completed, prio);
if (blk_queue_is_zoned(q)) {
unsigned long flags;
@@ -868,7 +815,6 @@ static ssize_t __FUNC(struct elevator_queue *e, char *page) \
#define SHOW_JIFFIES(__FUNC, __VAR) SHOW_INT(__FUNC, jiffies_to_msecs(__VAR))
SHOW_JIFFIES(deadline_read_expire_show, dd->fifo_expire[DD_READ]);
SHOW_JIFFIES(deadline_write_expire_show, dd->fifo_expire[DD_WRITE]);
-SHOW_JIFFIES(deadline_aging_expire_show, dd->aging_expire);
SHOW_INT(deadline_writes_starved_show, dd->writes_starved);
SHOW_INT(deadline_front_merges_show, dd->front_merges);
SHOW_INT(deadline_async_depth_show, dd->front_merges);
@@ -898,7 +844,6 @@ static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count)
STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, msecs_to_jiffies)
STORE_JIFFIES(deadline_read_expire_store, &dd->fifo_expire[DD_READ], 0, INT_MAX);
STORE_JIFFIES(deadline_write_expire_store, &dd->fifo_expire[DD_WRITE], 0, INT_MAX);
-STORE_JIFFIES(deadline_aging_expire_store, &dd->aging_expire, 0, INT_MAX);
STORE_INT(deadline_writes_starved_store, &dd->writes_starved, INT_MIN, INT_MAX);
STORE_INT(deadline_front_merges_store, &dd->front_merges, 0, 1);
STORE_INT(deadline_async_depth_store, &dd->front_merges, 1, INT_MAX);
@@ -917,7 +862,6 @@ static struct elv_fs_entry deadline_attrs[] = {
DD_ATTR(front_merges),
DD_ATTR(async_depth),
DD_ATTR(fifo_batch),
- DD_ATTR(aging_expire),
__ATTR_NULL
};
@@ -1146,26 +1090,11 @@ MODULE_ALIAS("mq-deadline-iosched");
static int __init deadline_init(void)
{
- int ret;
-
- ret = elv_register(&mq_deadline);
- if (ret)
- goto out;
- ret = dd_blkcg_init();
- if (ret)
- goto unreg;
-
-out:
- return ret;
-
-unreg:
- elv_unregister(&mq_deadline);
- goto out;
+ return elv_register(&mq_deadline);
}
static void __exit deadline_exit(void)
{
- dd_blkcg_exit();
elv_unregister(&mq_deadline);
}
diff --git a/block/partitions/ldm.c b/block/partitions/ldm.c
index a6f0c9eaebe9..27f6c7d9c776 100644
--- a/block/partitions/ldm.c
+++ b/block/partitions/ldm.c
@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-/**
+/*
* ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
*
* Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-14 10:55:40 +0000