diff mbox series

[4/4] blk-throttle: Fix IO hang for a corner case

Message ID 605f98f527761d79dea4345976e57566c03afcd4.1600592693.git.baolin.wang@linux.alibaba.com (mailing list archive)
State New, archived
Headers show
Series Some improvements for blk throttle | expand

Commit Message

Baolin Wang Sept. 20, 2020, 9:14 a.m. UTC 
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>
---
 block/blk-throttle.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index b0d8f7c..0649bce 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;