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authorBaolin Wang <baolin.wang@linux.alibaba.com>2020-10-08 11:52:25 +0800
committerJens Axboe <axboe@kernel.dk>2020-10-08 08:01:38 -0600
commit5b7048b89745c3c5fb4b3080fb7bced61dba2a2b (patch)
tree42f5930231ace93e1cb02357fecbe6f67fa17593
parentb185efa78bf9f13e32f115169e4ab35e68993461 (diff)
downloadlinux-5b7048b89745c3c5fb4b3080fb7bced61dba2a2b.tar.bz2
blk-throttle: Fix IO hang for a corner case
It can not scale up in throtl_adjusted_limit() if we set bps or iops is 1, which will cause IO hang when enable low limit. Thus we should treat 1 as a illegal value to avoid this issue. Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/blk-throttle.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index b0d8f7cc5e92..0649bceebf35 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1687,13 +1687,13 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
goto out_finish;
ret = -EINVAL;
- if (!strcmp(tok, "rbps"))
+ if (!strcmp(tok, "rbps") && val > 1)
v[0] = val;
- else if (!strcmp(tok, "wbps"))
+ else if (!strcmp(tok, "wbps") && val > 1)
v[1] = val;
- else if (!strcmp(tok, "riops"))
+ else if (!strcmp(tok, "riops") && val > 1)
v[2] = min_t(u64, val, UINT_MAX);
- else if (!strcmp(tok, "wiops"))
+ else if (!strcmp(tok, "wiops") && val > 1)
v[3] = min_t(u64, val, UINT_MAX);
else if (off == LIMIT_LOW && !strcmp(tok, "idle"))
idle_time = val;