Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Yu Kuai 3a5f45a4ad block, bfq: don't break merge chain in bfq_split_bfqq() ... [ Upstream commit 42c306ed723321af4003b2a41bb73728cab54f85 ] Consider the following scenario: Process 1 Process 2 Process 3 Process 4 (BIC1) (BIC2) (BIC3) (BIC4) Λ | | | \-------------\ \-------------\ \--------------\| V V V bfqq1--------->bfqq2---------->bfqq3----------->bfqq4 ref 0 1 2 4 If Process 1 issue a new IO and bfqq2 is found, and then bfq_init_rq() decide to spilt bfqq2 by bfq_split_bfqq(). Howerver, procress reference of bfqq2 is 1 and bfq_split_bfqq() just clear the coop flag, which will break the merge chain. Expected result: caller will allocate a new bfqq for BIC1 Process 1 Process 2 Process 3 Process 4 (BIC1) (BIC2) (BIC3) (BIC4) | | | \-------------\ \--------------\| V V bfqq1--------->bfqq2---------->bfqq3----------->bfqq4 ref 0 0 1 3 Since the condition is only used for the last bfqq4 when the previous bfqq2 and bfqq3 are already splited. Fix the problem by checking if bfqq is the last one in the merge chain as well. Fixes: 36eca89483 ("block, bfq: add Early Queue Merge (EQM)") Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240902130329.3787024-4-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-11-08 16:20:28 +01:00
..
partitions	block/partition: fix signedness issue for Amiga partitions	2023-07-27 08:37:29 +02:00
badblocks.c
bfq-cgroup.c
bfq-iosched.c	block, bfq: don't break merge chain in bfq_split_bfqq()	2024-11-08 16:20:28 +01:00
bfq-iosched.h
bfq-wf2q.c
bio-integrity.c	block: initialize integrity buffer to zero before writing it to media	2024-09-12 11:03:50 +02:00
bio.c	block: prevent an integer overflow in bvec_try_merge_hw_page	2024-02-23 08:24:59 +01:00
blk-cgroup.c
blk-core.c
blk-exec.c
blk-flush.c
blk-integrity.c
blk-ioc.c
blk-iocost.c	block/blk-iocost (gcc13): keep large values in a new enum	2023-06-14 10:59:54 +02:00
blk-iolatency.c
blk-lib.c
blk-map.c
blk-merge.c	treewide: Remove uninitialized_var() usage	2023-06-09 10:29:01 +02:00
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: correct stale comment of .get_budget	2023-03-11 16:43:34 +01:00
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: fix IO hang from sbitmap wakeup race	2024-02-23 08:25:03 +01:00
blk-mq.h
blk-pm.c
blk-pm.h
blk-rq-qos.c
blk-rq-qos.h
blk-settings.c
blk-softirq.c
blk-stat.c	block: prevent division by zero in blk_rq_stat_sum()	2024-04-13 12:51:38 +02:00
blk-stat.h
blk-sysfs.c
blk-throttle.c	blk-throttle: fix lockdep warning of "cgroup_mutex or RCU read lock required!"	2023-12-20 15:41:20 +01:00
blk-timeout.c
blk-wbt.c
blk-wbt.h
blk-zoned.c
blk.h
bounce.c
bsg-lib.c
bsg.c
cmdline-parser.c
compat_ioctl.c
elevator.c
genhd.c
ioctl.c
ioprio.c
Kconfig
Kconfig.iosched
kyber-iosched.c
Makefile
mq-deadline.c
opal_proto.h	block: sed-opal: handle empty atoms when parsing response	2024-03-26 18:22:12 -04:00
partition-generic.c
scsi_ioctl.c
sed-opal.c	block: sed-opal: handle empty atoms when parsing response	2024-03-26 18:22:12 -04:00
t10-pi.c