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fuse: remove unneeded lock which protecting update of congestion_threshold 

Commit 670d21c6e1 ("fuse: remove reliance on bdi congestion") change how
congestion_threshold is used and lock in
fuse_conn_congestion_threshold_write is not needed anymore.
1. Access to supe_block is removed along with removing of bdi congestion.
Then down_read(&fc->killsb) which protecting access to super_block is no
needed.
2. Compare num_background and congestion_threshold without holding
bg_lock. Then there is no need to hold bg_lock to update
congestion_threshold.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Kemeng Shi 2023-10-07 23:39:56 +08:00 committed by Miklos Szeredi
parent 738adade96
commit efc4105a4c
1 changed files with 1 additions and 5 deletions
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6
fs/fuse/control.c
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@ -174,11 +174,7 @@ static ssize_t fuse_conn_congestion_threshold_write(struct file *file,
if (!fc)
goto out;
down_read(&fc->killsb);
spin_lock(&fc->bg_lock);
fc->congestion_threshold = val;
spin_unlock(&fc->bg_lock);
up_read(&fc->killsb);
WRITE_ONCE(fc->congestion_threshold, val);
fuse_conn_put(fc);
out:
return ret;