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res_counter: fix off-by-one bug in setting limit

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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>
This commit is contained in:
Li Zefan 2008-09-05 14:00:18 -07:00 committed by Linus Torvalds
parent 7f621861fb
commit 11d55d2cba
1 changed files with 1 additions and 1 deletions
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2
include/linux/res_counter.h
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@ -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;
}