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authorLi Zefan <lizf@cn.fujitsu.com>2008-09-05 14:00:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-09-05 14:39:37 -0700
commit11d55d2cba6e867be8955e5ae011c54c556b849f (patch)
tree53a0746c05e5922a2c35db9201d8d92818c4ed67 /include
parent7f621861fbdb1ea90c36b1a59a45cb84b4a2239f (diff)
res_counter: fix off-by-one bug in setting limit
I found we can no longer set limit to 0 with 2.6.27-rcX: # mount -t cgroup -omemory xxx /mnt # mkdir /mnt/0 # echo 0 > /mnt/0/memory.limit_in_bytes bash: echo: write error: Device or resource busy It turned out 'limit' can't be set to 'usage', which is wrong IMO. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/res_counter.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index fdeadd9740d..271c1c2c9f6 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -166,7 +166,7 @@ static inline int res_counter_set_limit(struct res_counter *cnt,
int ret = -EBUSY;
spin_lock_irqsave(&cnt->lock, flags);
- if (cnt->usage < limit) {
+ if (cnt->usage <= limit) {
cnt->limit = limit;
ret = 0;
}