system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-07-21 10:41:44 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

blk-wbt: remove dead code to handle wbt enable/disable with io inflight

Browse source 
enable or disable wbt is always called with queue freezed, so that wbt
can never be enabled or disabled while io is still inflight, and this
behaviour should always hold to avoid io hang(There have been reported
several times).

Therefor, the code to handle wbt enable/diskble with io inflight is not
and never will be used, hence remove such dead code.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230527010644.647900-3-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2023-05-27 09:06:41 +08:00 committed by Jens Axboe
parent 645a829e03
commit 71b8642e79
1 changed files with 0 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
block/blk-wbt.c
View file

@ -200,15 +200,6 @@ static void wbt_rqw_done(struct rq_wb *rwb, struct rq_wait *rqw,
inflight = atomic_dec_return(&rqw->inflight);
/*
* wbt got disabled with IO in flight. Wake up any potential
* waiters, we don't have to do more than that.
*/
if (unlikely(!rwb_enabled(rwb))) {
rwb_wake_all(rwb);
return;
}
/*
* For discards, our limit is always the background. For writes, if
* the device does write back caching, drop further down before we
@ -545,13 +536,6 @@ static inline unsigned int get_limit(struct rq_wb *rwb, blk_opf_t opf)
{
unsigned int limit;
/*
* If we got disabled, just return UINT_MAX. This ensures that
* we'll properly inc a new IO, and dec+wakeup at the end.
*/
if (!rwb_enabled(rwb))
return UINT_MAX;
if ((opf & REQ_OP_MASK) == REQ_OP_DISCARD)
return rwb->wb_background;