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block-5.7-2020-05-09 

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Merge tag 'block-5.7-2020-05-09' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - a small series fixing a use-after-free of bdi name (Christoph,Yufen)

 - NVMe fix for a regression with the smaller CQ update (Alexey)

 - NVMe fix for a hang at namespace scanning error recovery (Sagi)

 - fix race with blk-iocost iocg->abs_vdebt updates (Tejun)

* tag 'block-5.7-2020-05-09' of git://git.kernel.dk/linux-block:
  nvme: fix possible hang when ns scanning fails during error recovery
  nvme-pci: fix "slimmer CQ head update"
  bdi: add a ->dev_name field to struct backing_dev_info
  bdi: use bdi_dev_name() to get device name
  bdi: move bdi_dev_name out of line
  vboxsf: don't use the source name in the bdi name
  iocost: protect iocg->abs_vdebt with iocg->waitq.lock
This commit is contained in:
Linus Torvalds 2020-05-10 11:16:07 -07:00
parent e99332e7b4 59c7c3caaa
commit 0a85ed6e7f
12 changed files with 107 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block/bfq-iosched.c
View File

@ -123,6 +123,7 @@
#include <linux/ioprio.h>
#include <linux/sbitmap.h>
#include <linux/delay.h>
#include <linux/backing-dev.h>
#include "blk.h"
#include "blk-mq.h"
@ -4976,8 +4977,9 @@ bfq_set_next_ioprio_data(struct bfq_queue *bfqq, struct bfq_io_cq *bic)
ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio);
switch (ioprio_class) {
default:
dev_err(bfqq->bfqd->queue->backing_dev_info->dev,
"bfq: bad prio class %d\n", ioprio_class);
pr_err("bdi %s: bfq: bad prio class %d\n",
bdi_dev_name(bfqq->bfqd->queue->backing_dev_info),
ioprio_class);
/* fall through */
case IOPRIO_CLASS_NONE:
/*

2
block/blk-cgroup.c
View File

@ -496,7 +496,7 @@ const char *blkg_dev_name(struct blkcg_gq *blkg)
{
/* some drivers (floppy) instantiate a queue w/o disk registered */
if (blkg->q->backing_dev_info->dev)
return dev_name(blkg->q->backing_dev_info->dev);
return bdi_dev_name(blkg->q->backing_dev_info);
return NULL;
}

117
block/blk-iocost.c
View File

@ -466,7 +466,7 @@ struct ioc_gq {
*/
atomic64_t vtime;
atomic64_t done_vtime;
atomic64_t abs_vdebt;
u64 abs_vdebt;
u64 last_vtime;
/*
@ -1142,7 +1142,7 @@ static void iocg_kick_waitq(struct ioc_gq *iocg, struct ioc_now *now)
struct iocg_wake_ctx ctx = { .iocg = iocg };
u64 margin_ns = (u64)(ioc->period_us *
WAITQ_TIMER_MARGIN_PCT / 100) * NSEC_PER_USEC;
u64 abs_vdebt, vdebt, vshortage, expires, oexpires;
u64 vdebt, vshortage, expires, oexpires;
s64 vbudget;
u32 hw_inuse;
@ -1152,18 +1152,15 @@ static void iocg_kick_waitq(struct ioc_gq *iocg, struct ioc_now *now)
vbudget = now->vnow - atomic64_read(&iocg->vtime);
/* pay off debt */
abs_vdebt = atomic64_read(&iocg->abs_vdebt);
vdebt = abs_cost_to_cost(abs_vdebt, hw_inuse);
vdebt = abs_cost_to_cost(iocg->abs_vdebt, hw_inuse);
if (vdebt && vbudget > 0) {
u64 delta = min_t(u64, vbudget, vdebt);
u64 abs_delta = min(cost_to_abs_cost(delta, hw_inuse),
abs_vdebt);
iocg->abs_vdebt);
atomic64_add(delta, &iocg->vtime);
atomic64_add(delta, &iocg->done_vtime);
atomic64_sub(abs_delta, &iocg->abs_vdebt);
if (WARN_ON_ONCE(atomic64_read(&iocg->abs_vdebt) < 0))
atomic64_set(&iocg->abs_vdebt, 0);
iocg->abs_vdebt -= abs_delta;
}
/*
@ -1219,12 +1216,18 @@ static bool iocg_kick_delay(struct ioc_gq *iocg, struct ioc_now *now, u64 cost)
u64 expires, oexpires;
u32 hw_inuse;
lockdep_assert_held(&iocg->waitq.lock);
/* debt-adjust vtime */
current_hweight(iocg, NULL, &hw_inuse);
vtime += abs_cost_to_cost(atomic64_read(&iocg->abs_vdebt), hw_inuse);
vtime += abs_cost_to_cost(iocg->abs_vdebt, hw_inuse);
/* clear or maintain depending on the overage */
if (time_before_eq64(vtime, now->vnow)) {
/*
* Clear or maintain depending on the overage. Non-zero vdebt is what
* guarantees that @iocg is online and future iocg_kick_delay() will
* clear use_delay. Don't leave it on when there's no vdebt.
*/
if (!iocg->abs_vdebt || time_before_eq64(vtime, now->vnow)) {
blkcg_clear_delay(blkg);
return false;
}
@ -1258,9 +1261,12 @@ static enum hrtimer_restart iocg_delay_timer_fn(struct hrtimer *timer)
{
struct ioc_gq *iocg = container_of(timer, struct ioc_gq, delay_timer);
struct ioc_now now;
unsigned long flags;
spin_lock_irqsave(&iocg->waitq.lock, flags);
ioc_now(iocg->ioc, &now);
iocg_kick_delay(iocg, &now, 0);
spin_unlock_irqrestore(&iocg->waitq.lock, flags);
return HRTIMER_NORESTART;
}
@ -1368,14 +1374,13 @@ static void ioc_timer_fn(struct timer_list *timer)
* should have woken up in the last period and expire idle iocgs.
*/
list_for_each_entry_safe(iocg, tiocg, &ioc->active_iocgs, active_list) {
if (!waitqueue_active(&iocg->waitq) &&
!atomic64_read(&iocg->abs_vdebt) && !iocg_is_idle(iocg))
if (!waitqueue_active(&iocg->waitq) && iocg->abs_vdebt &&
!iocg_is_idle(iocg))
continue;
spin_lock(&iocg->waitq.lock);
if (waitqueue_active(&iocg->waitq) ||
atomic64_read(&iocg->abs_vdebt)) {
if (waitqueue_active(&iocg->waitq) || iocg->abs_vdebt) {
/* might be oversleeping vtime / hweight changes, kick */
iocg_kick_waitq(iocg, &now);
iocg_kick_delay(iocg, &now, 0);
@ -1718,28 +1723,49 @@ static void ioc_rqos_throttle(struct rq_qos *rqos, struct bio *bio)
* tests are racy but the races aren't systemic - we only miss once
* in a while which is fine.
*/
if (!waitqueue_active(&iocg->waitq) &&
!atomic64_read(&iocg->abs_vdebt) &&
if (!waitqueue_active(&iocg->waitq) && !iocg->abs_vdebt &&
time_before_eq64(vtime + cost, now.vnow)) {
iocg_commit_bio(iocg, bio, cost);
return;
}
/*
* We're over budget. If @bio has to be issued regardless,
* remember the abs_cost instead of advancing vtime.
* iocg_kick_waitq() will pay off the debt before waking more IOs.
* We activated above but w/o any synchronization. Deactivation is
* synchronized with waitq.lock and we won't get deactivated as long
* as we're waiting or has debt, so we're good if we're activated
* here. In the unlikely case that we aren't, just issue the IO.
*/
spin_lock_irq(&iocg->waitq.lock);
if (unlikely(list_empty(&iocg->active_list))) {
spin_unlock_irq(&iocg->waitq.lock);
iocg_commit_bio(iocg, bio, cost);
return;
}
/*
* We're over budget. If @bio has to be issued regardless, remember
* the abs_cost instead of advancing vtime. iocg_kick_waitq() will pay
* off the debt before waking more IOs.
*
* This way, the debt is continuously paid off each period with the
* actual budget available to the cgroup. If we just wound vtime,
* we would incorrectly use the current hw_inuse for the entire
* amount which, for example, can lead to the cgroup staying
* blocked for a long time even with substantially raised hw_inuse.
* actual budget available to the cgroup. If we just wound vtime, we
* would incorrectly use the current hw_inuse for the entire amount
* which, for example, can lead to the cgroup staying blocked for a
* long time even with substantially raised hw_inuse.
*
* An iocg with vdebt should stay online so that the timer can keep
* deducting its vdebt and [de]activate use_delay mechanism
* accordingly. We don't want to race against the timer trying to
* clear them and leave @iocg inactive w/ dangling use_delay heavily
* penalizing the cgroup and its descendants.
*/
if (bio_issue_as_root_blkg(bio) || fatal_signal_pending(current)) {
atomic64_add(abs_cost, &iocg->abs_vdebt);
iocg->abs_vdebt += abs_cost;
if (iocg_kick_delay(iocg, &now, cost))
blkcg_schedule_throttle(rqos->q,
(bio->bi_opf & REQ_SWAP) == REQ_SWAP);
spin_unlock_irq(&iocg->waitq.lock);
return;
}
@ -1756,20 +1782,6 @@ static void ioc_rqos_throttle(struct rq_qos *rqos, struct bio *bio)
* All waiters are on iocg->waitq and the wait states are
* synchronized using waitq.lock.
*/
spin_lock_irq(&iocg->waitq.lock);
/*
* We activated above but w/o any synchronization. Deactivation is
* synchronized with waitq.lock and we won't get deactivated as
* long as we're waiting, so we're good if we're activated here.
* In the unlikely case that we are deactivated, just issue the IO.
*/
if (unlikely(list_empty(&iocg->active_list))) {
spin_unlock_irq(&iocg->waitq.lock);
iocg_commit_bio(iocg, bio, cost);
return;
}
init_waitqueue_func_entry(&wait.wait, iocg_wake_fn);
wait.wait.private = current;
wait.bio = bio;
@ -1801,6 +1813,7 @@ static void ioc_rqos_merge(struct rq_qos *rqos, struct request *rq,
struct ioc_now now;
u32 hw_inuse;
u64 abs_cost, cost;
unsigned long flags;
/* bypass if disabled or for root cgroup */
if (!ioc->enabled || !iocg->level)
@ -1820,15 +1833,28 @@ static void ioc_rqos_merge(struct rq_qos *rqos, struct request *rq,
iocg->cursor = bio_end;
/*
* Charge if there's enough vtime budget and the existing request
* has cost assigned. Otherwise, account it as debt. See debt
* handling in ioc_rqos_throttle() for details.
* Charge if there's enough vtime budget and the existing request has
* cost assigned.
*/
if (rq->bio && rq->bio->bi_iocost_cost &&
time_before_eq64(atomic64_read(&iocg->vtime) + cost, now.vnow))
time_before_eq64(atomic64_read(&iocg->vtime) + cost, now.vnow)) {
iocg_commit_bio(iocg, bio, cost);
else
atomic64_add(abs_cost, &iocg->abs_vdebt);
return;
}
/*
* Otherwise, account it as debt if @iocg is online, which it should
* be for the vast majority of cases. See debt handling in
* ioc_rqos_throttle() for details.
*/
spin_lock_irqsave(&iocg->waitq.lock, flags);
if (likely(!list_empty(&iocg->active_list))) {
iocg->abs_vdebt += abs_cost;
iocg_kick_delay(iocg, &now, cost);
} else {
iocg_commit_bio(iocg, bio, cost);
}
spin_unlock_irqrestore(&iocg->waitq.lock, flags);
}
static void ioc_rqos_done_bio(struct rq_qos *rqos, struct bio *bio)
@ -1998,7 +2024,6 @@ static void ioc_pd_init(struct blkg_policy_data *pd)
iocg->ioc = ioc;
atomic64_set(&iocg->vtime, now.vnow);
atomic64_set(&iocg->done_vtime, now.vnow);
atomic64_set(&iocg->abs_vdebt, 0);
atomic64_set(&iocg->active_period, atomic64_read(&ioc->cur_period));
INIT_LIST_HEAD(&iocg->active_list);
iocg->hweight_active = HWEIGHT_WHOLE;

2
drivers/nvme/host/core.c
View File

@ -1110,7 +1110,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
* Don't treat an error as fatal, as we potentially already
* have a NGUID or EUI-64.
*/
if (status > 0)
if (status > 0 && !(status & NVME_SC_DNR))
status = 0;
goto free_data;
}

6
drivers/nvme/host/pci.c
View File

@ -973,9 +973,13 @@ static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, u16 idx)
static inline void nvme_update_cq_head(struct nvme_queue *nvmeq)
{
if (++nvmeq->cq_head == nvmeq->q_depth) {
u16 tmp = nvmeq->cq_head + 1;
if (tmp == nvmeq->q_depth) {
nvmeq->cq_head = 0;
nvmeq->cq_phase ^= 1;
} else {
nvmeq->cq_head = tmp;
}
}

2
fs/ceph/debugfs.c
View File

@ -271,7 +271,7 @@ void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
&congestion_kb_fops);
snprintf(name, sizeof(name), "../../bdi/%s",
dev_name(fsc->sb->s_bdi->dev));
bdi_dev_name(fsc->sb->s_bdi));
fsc->debugfs_bdi =
debugfs_create_symlink("bdi",
fsc->client->debugfs_dir,

2
fs/vboxsf/super.c
View File

@ -164,7 +164,7 @@ static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc)
goto fail_free;
}
err = super_setup_bdi_name(sb, "vboxsf-%s.%d", fc->source, sbi->bdi_id);
err = super_setup_bdi_name(sb, "vboxsf-%d", sbi->bdi_id);
if (err)
goto fail_free;

1
include/linux/backing-dev-defs.h
View File

@ -219,6 +219,7 @@ struct backing_dev_info {
wait_queue_head_t wb_waitq;
struct device *dev;
char dev_name[64];
struct device *owner;
struct timer_list laptop_mode_wb_timer;

9
include/linux/backing-dev.h
View File

@ -505,13 +505,6 @@ static inline int bdi_rw_congested(struct backing_dev_info *bdi)
(1 << WB_async_congested));
}
extern const char *bdi_unknown_name;
static inline const char *bdi_dev_name(struct backing_dev_info *bdi)
{
if (!bdi || !bdi->dev)
return bdi_unknown_name;
return dev_name(bdi->dev);
}
const char *bdi_dev_name(struct backing_dev_info *bdi);
#endif /* _LINUX_BACKING_DEV_H */

8
include/trace/events/wbt.h
View File

@ -33,7 +33,7 @@ TRACE_EVENT(wbt_stat,
),
TP_fast_assign(
strlcpy(__entry->name, dev_name(bdi->dev),
strlcpy(__entry->name, bdi_dev_name(bdi),
ARRAY_SIZE(__entry->name));
__entry->rmean = stat[0].mean;
__entry->rmin = stat[0].min;
@ -68,7 +68,7 @@ TRACE_EVENT(wbt_lat,
),
TP_fast_assign(
strlcpy(__entry->name, dev_name(bdi->dev),
strlcpy(__entry->name, bdi_dev_name(bdi),
ARRAY_SIZE(__entry->name));
__entry->lat = div_u64(lat, 1000);
),
@ -105,7 +105,7 @@ TRACE_EVENT(wbt_step,
),
TP_fast_assign(
strlcpy(__entry->name, dev_name(bdi->dev),
strlcpy(__entry->name, bdi_dev_name(bdi),
ARRAY_SIZE(__entry->name));
__entry->msg = msg;
__entry->step = step;
@ -141,7 +141,7 @@ TRACE_EVENT(wbt_timer,
),
TP_fast_assign(
strlcpy(__entry->name, dev_name(bdi->dev),
strlcpy(__entry->name, bdi_dev_name(bdi),
ARRAY_SIZE(__entry->name));
__entry->status = status;
__entry->step = step;

13
mm/backing-dev.c
View File

@ -21,7 +21,7 @@ struct backing_dev_info noop_backing_dev_info = {
EXPORT_SYMBOL_GPL(noop_backing_dev_info);
static struct class *bdi_class;
const char *bdi_unknown_name = "(unknown)";
static const char *bdi_unknown_name = "(unknown)";
/*
* bdi_lock protects bdi_tree and updates to bdi_list. bdi_list has RCU
@ -938,7 +938,8 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)
if (bdi->dev) /* The driver needs to use separate queues per device */
return 0;
dev = device_create_vargs(bdi_class, NULL, MKDEV(0, 0), bdi, fmt, args);
vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args);
dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
if (IS_ERR(dev))
return PTR_ERR(dev);
@ -1043,6 +1044,14 @@ void bdi_put(struct backing_dev_info *bdi)
}
EXPORT_SYMBOL(bdi_put);
const char *bdi_dev_name(struct backing_dev_info *bdi)
{
if (!bdi || !bdi->dev)
return bdi_unknown_name;
return bdi->dev_name;
}
EXPORT_SYMBOL_GPL(bdi_dev_name);
static wait_queue_head_t congestion_wqh[2] = {
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]),
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1])

7
tools/cgroup/iocost_monitor.py
View File

@ -159,7 +159,12 @@ class IocgStat:
else:
self.inflight_pct = 0
self.debt_ms = iocg.abs_vdebt.counter.value_() / VTIME_PER_USEC / 1000
# vdebt used to be an atomic64_t and is now u64, support both
try:
self.debt_ms = iocg.abs_vdebt.counter.value_() / VTIME_PER_USEC / 1000
except:
self.debt_ms = iocg.abs_vdebt.value_() / VTIME_PER_USEC / 1000
self.use_delay = blkg.use_delay.counter.value_()
self.delay_ms = blkg.delay_nsec.counter.value_() / 1_000_000