Paolo Valente 39a7082195 block, bfq: do not plug I/O for bfq_queues with no proc refs ... [ Upstream commit f718b09327 ] Commit 478de3380c ("block, bfq: deschedule empty bfq_queues not referred by any process") fixed commit 3726112ec7 ("block, bfq: re-schedule empty queues if they deserve I/O plugging") by descheduling an empty bfq_queue when it remains with not process reference. Yet, this still left a case uncovered: an empty bfq_queue with not process reference that remains in service. This happens for an in-service sync bfq_queue that is deemed to deserve I/O-dispatch plugging when it remains empty. Yet no new requests will arrive for such a bfq_queue if no process sends requests to it any longer. Even worse, the bfq_queue may happen to be prematurely freed while still in service (because there may remain no reference to it any longer). This commit solves this problem by preventing I/O dispatch from being plugged for the in-service bfq_queue, if the latter has no process reference (the bfq_queue is then prevented from remaining in service). Fixes: 3726112ec7 ("block, bfq: re-schedule empty queues if they deserve I/O plugging") Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Reported-by: Patrick Dung <patdung100@gmail.com> Tested-by: Patrick Dung <patdung100@gmail.com> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-02-24 08:36:31 +01:00
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partitions	…
Kconfig	…
Kconfig.iosched	…
Makefile	…
badblocks.c	…
bfq-cgroup.c	…
bfq-iosched.c	block, bfq: do not plug I/O for bfq_queues with no proc refs	2020-02-24 08:36:31 +01:00
bfq-iosched.h	…
bfq-wf2q.c	…
bio-integrity.c	block: fix memleak of bio integrity data	2020-01-26 10:01:09 +01:00
bio.c	block: fix memleak of bio integrity data	2020-01-26 10:01:09 +01:00
blk-cgroup.c	…
blk-core.c	…
blk-exec.c	…
blk-flush.c	…
blk-integrity.c	…
blk-ioc.c	…
blk-iocost.c	…
blk-iolatency.c	…
blk-lib.c	…
blk-map.c	…
blk-merge.c	…
blk-mq-cpumap.c	…
blk-mq-debugfs-zoned.c	…
blk-mq-debugfs.c	…
blk-mq-debugfs.h	…
blk-mq-pci.c	…
blk-mq-rdma.c	…
blk-mq-sched.c	…
blk-mq-sched.h	…
blk-mq-sysfs.c	…
blk-mq-tag.c	…
blk-mq-tag.h	…
blk-mq-virtio.c	…
blk-mq.c	…
blk-mq.h	…
blk-pm.c	…
blk-pm.h	…
blk-rq-qos.c	…
blk-rq-qos.h	…
blk-settings.c	block: fix an integer overflow in logical block size	2020-01-23 08:22:32 +01:00
blk-softirq.c	…
blk-stat.c	…
blk-stat.h	…
blk-sysfs.c	…
blk-throttle.c	…
blk-timeout.c	…
blk-wbt.c	…
blk-wbt.h	…
blk-zoned.c	…
blk.h	block: fix memleak of bio integrity data	2020-01-26 10:01:09 +01:00
bounce.c	…
bsg-lib.c	block: Fix the type of 'sts' in bsg_queue_rq()	2020-01-23 08:22:44 +01:00
bsg.c	…
cmdline-parser.c	…
compat_ioctl.c	…
elevator.c	…
genhd.c	…
ioctl.c	…
ioprio.c	…
kyber-iosched.c	…
mq-deadline.c	…
opal_proto.h	…
partition-generic.c	…
scsi_ioctl.c	…
sed-opal.c	…
t10-pi.c	…