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loongarch-next
linux-loongson/block
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Julian Sun 8f5845e074 block: restore default wbt enablement 
The commit 245618f8e4 ("block: protect wbt_lat_usec using
q->elevator_lock") protected wbt_enable_default() with
q->elevator_lock; however, it also placed wbt_enable_default()
before blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);, resulting
in wbt failing to be enabled.

Moreover, the protection of wbt_enable_default() by q->elevator_lock
was removed in commit 78c271344b ("block: move wbt_enable_default()
out of queue freezing from sched ->exit()"), so we can directly fix
this issue by placing wbt_enable_default() after
blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);.

Additionally, this issue also causes the inability to read the
wbt_lat_usec file, and the scenario is as follows:

root@q:/sys/block/sda/queue# cat wbt_lat_usec
cat: wbt_lat_usec: Invalid argument

root@q:/data00/sjc/linux# ls /sys/kernel/debug/block/sda/rqos
cannot access '/sys/kernel/debug/block/sda/rqos': No such file or directory

root@q:/data00/sjc/linux# find /sys -name wbt
/sys/kernel/debug/tracing/events/wbt

After testing with this patch, wbt can be enabled normally.

Signed-off-by: Julian Sun <sunjunchao@bytedance.com>
Cc: stable@vger.kernel.org
Fixes: 245618f8e4 ("block: protect wbt_lat_usec using q->elevator_lock")
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250812154257.57540-1-sunjunchao@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-08-13 05:33:48 -06:00
..
partitions for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
badblocks.c badblocks: Fix a nonsense WARN_ON() which checks whether a u64 variable < 0 2025-03-10 07:41:58 -06:00
bdev.c xfs: New code for 6.16 2025-05-26 12:56:01 -07:00
bfq-cgroup.c Revert "block, bfq: merge bfq_release_process_ref() into bfq_put_cooperator()" 2024-11-19 19:05:32 -07:00
bfq-iosched.c block, bfq: remove redundant __GFP_NOWARN 2025-08-11 07:59:22 -06:00
bfq-iosched.h lib/sbitmap: convert shallow_depth from one word to the whole sbitmap 2025-08-07 06:30:17 -06:00
bfq-wf2q.c
bio-integrity-auto.c block: rename tuple_size field in blk_integrity to metadata_size 2025-07-01 14:00:14 +02:00
bio-integrity.c block: don't merge different kinds of P2P transfers in a single bio 2025-06-30 15:50:32 -06:00
bio.c Summary of significant series in this pull request: 2025-07-31 14:57:54 -07:00
blk-cgroup-fc-appid.c block: Replace all non-returning strlcpy with strscpy 2023-06-01 09:13:31 -06:00
blk-cgroup-rwstat.c blk-cgroup: use group allocation/free of per-cpu counters API 2024-04-03 09:10:17 -06:00
blk-cgroup-rwstat.h blk-cgroup: rwstat: fix kernel-doc warnings in header file 2025-01-13 07:47:09 -07:00
blk-cgroup.c blk-cgroup: remove redundant __GFP_NOWARN 2025-08-11 07:59:40 -06:00
blk-cgroup.h block: correct locking order for protecting blk-wbt parameters 2025-03-19 11:35:45 -06:00
blk-core.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-crypto-fallback.c block: add a bi_write_stream field 2025-05-06 07:46:43 -06:00
blk-crypto-internal.h blk-crypto: add ioctls to create and prepare hardware-wrapped keys 2025-02-10 09:54:19 -07:00
blk-crypto-profile.c blk-crypto: export wrapped key functions 2025-05-06 19:08:08 +02:00
blk-crypto-sysfs.c blk-crypto: show supported key types in sysfs 2025-02-10 09:54:19 -07:00
blk-crypto.c blk-crypto: add ioctls to create and prepare hardware-wrapped keys 2025-02-10 09:54:19 -07:00
blk-flush.c block: remove unused parameter 2025-03-12 08:25:28 -06:00
blk-ia-ranges.c block: get rid of request queue ->sysfs_dir_lock 2025-01-29 07:16:47 -07:00
blk-integrity.c block: fix lbmd_guard_tag_type assignment in FS_IOC_GETLBMD_CAP 2025-07-23 14:55:51 +02:00
blk-ioc.c blk-ioc: don't hold queue_lock for ioc_lookup_icq() 2025-07-29 06:26:34 -06:00
blk-iocost.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
blk-iolatency.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-ioprio.c blk-cgroup: Simplify policy files registration 2025-03-11 09:22:55 -10:00
blk-ioprio.h blk-ioprio: remove per-disk structure 2024-07-28 16:47:51 -06:00
blk-lib.c block: fix detection of unsupported WRITE SAME in blkdev_issue_write_zeroes 2024-08-28 08:49:25 -06:00
blk-map.c block: simplify bio_map_kern 2025-05-07 07:31:07 -06:00
blk-merge.c block: use plug request list tail for one-shot backmerge attempt 2025-06-11 08:48:46 -06:00
blk-mq-cpumap.c blk-mq: add number of queue calc helper 2025-07-01 10:24:19 -06:00
blk-mq-debugfs.c blk-mq-debugfs: use debugfs_get_aux() 2025-07-09 13:30:29 +02:00
blk-mq-debugfs.h block: Replace zone_wlock debugfs entry with zone_wplugs entry 2024-04-17 08:44:03 -06:00
blk-mq-dma.c block: add scatterlist-less DMA mapping helpers 2025-06-30 15:50:32 -06:00
blk-mq-sched.c block: fix potential deadlock while running nr_hw_queue update 2025-07-30 06:20:51 -06:00
blk-mq-sched.h block: fix potential deadlock while running nr_hw_queue update 2025-07-30 06:20:51 -06:00
blk-mq-sysfs.c block: protect hctx attributes/params using q->elevator_lock 2025-03-10 07:31:06 -06:00
blk-mq-tag.c block: remove unused parameter 2025-03-12 08:25:28 -06:00
blk-mq.c block: fix potential deadlock while running nr_hw_queue update 2025-07-30 06:20:51 -06:00
blk-mq.h block: clean up blk_mq_in_flight_rw() 2025-05-10 16:11:21 +08:00
blk-pm.c block: force noio scope in blk_mq_freeze_queue 2025-01-31 07:20:08 -07:00
blk-pm.h
blk-rq-qos.c block: blk-rq-qos: guard rq-qos helpers by static key 2025-04-21 05:07:03 -06:00
blk-rq-qos.h block: blk-rq-qos: guard rq-qos helpers by static key 2025-04-21 05:07:03 -06:00
blk-settings.c block: ensure discard_granularity is zero when discard is not supported 2025-07-31 15:01:35 -06:00
blk-stat.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-stat.h treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
blk-sysfs.c block: restore default wbt enablement 2025-08-13 05:33:48 -06:00
blk-throttle.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-throttle.h blk-throttle: Prevents the bps restricted io from entering the bps queue again 2025-05-13 12:08:27 -06:00
blk-timeout.c
blk-wbt.c blk-wbt: Eliminate ambiguity in the comments of struct rq_wb 2025-08-11 10:21:38 -06:00
blk-wbt.h blk-wbt: remove the separate write cache tracking 2023-12-26 09:28:10 -07:00
blk-zoned.c block: add trace messages to zone write plugging 2025-07-15 08:03:49 -06:00
blk.h block: fix kobject double initialization in add_disk 2025-08-11 08:00:49 -06:00
bsg-lib.c block: remove unused parameter 'q' parameter in __blk_rq_map_sg() 2025-03-13 05:46:19 -06:00
bsg.c SCSI misc on 20230629 2023-06-30 11:57:07 -07:00
disk-events.c block: move bdev_mark_dead out of disk_check_media_change 2023-10-28 13:29:23 +02:00
early-lookup.c wrapper for access to ->bd_partno 2024-05-02 17:48:09 -04:00
elevator.c block: fix potential deadlock while running nr_hw_queue update 2025-07-30 06:20:51 -06:00
elevator.h block: fix lockdep warning caused by lock dependency in elv_iosched_store 2025-07-30 06:20:51 -06:00
fops.c vfs-6.17-rc1.iomap 2025-07-28 16:09:03 -07:00
genhd.c block: fix kobject double initialization in add_disk 2025-08-11 08:00:49 -06:00
holder.c block: fix deadlock between bd_link_disk_holder and partition scan 2024-02-23 07:44:19 -07:00
ioctl.c vfs-6.17-rc1.integrity 2025-07-28 15:12:00 -07:00
ioprio.c block: remove test of incorrect io priority level 2025-05-08 09:04:12 -06:00
Kconfig block: Remove obsolete configs BLK_MQ_{PCI,VIRTIO} 2025-05-14 05:43:56 -06:00
Kconfig.iosched
kyber-iosched.c lib/sbitmap: convert shallow_depth from one word to the whole sbitmap 2025-08-07 06:30:17 -06:00
Makefile blk-mq: move the DMA mapping code to a separate file 2025-05-16 08:43:41 -06:00
mq-deadline.c lib/sbitmap: convert shallow_depth from one word to the whole sbitmap 2025-08-07 06:30:17 -06:00
opal_proto.h block: sed-opal: handle empty atoms when parsing response 2024-02-16 15:52:45 -07:00
sed-opal.c block: sed-opal: add ioctl IOC_OPAL_SET_SID_PW 2024-10-22 08:16:40 -06:00
t10-pi.c block: rename tuple_size field in blk_integrity to metadata_size 2025-07-01 14:00:14 +02:00