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| author | Li Zefan | 2014-06-30 05:49:58 +0200 |
|---|---|---|
| committer | Tejun Heo | 2014-06-30 16:16:25 +0200 |
| commit | 970317aa48c6ef66cd023c039c2650c897bad927 (patch) | |
| tree | 6308e957b9690395717c0894dd339505d1071d9a /include/linux/kernfs.h | |
| parent | cpuset,mempolicy: fix sleeping function called from invalid context (diff) | |
| download | kernel-qcow2-linux-970317aa48c6ef66cd023c039c2650c897bad927.tar.gz kernel-qcow2-linux-970317aa48c6ef66cd023c039c2650c897bad927.tar.xz kernel-qcow2-linux-970317aa48c6ef66cd023c039c2650c897bad927.zip | |
cgroup: fix mount failure in a corner case
# cat test.sh
#! /bin/bash
mount -t cgroup -o cpu xxx /cgroup
umount /cgroup
mount -t cgroup -o cpu,cpuacct xxx /cgroup
umount /cgroup
# ./test.sh
mount: xxx already mounted or /cgroup busy
mount: according to mtab, xxx is already mounted on /cgroup
It's because the cgroupfs_root of the first mount was under destruction
asynchronously.
Fix this by delaying and then retrying mount for this case.
v3:
- put the refcnt immediately after getting it. (Tejun)
v2:
- use percpu_ref_tryget_live() rather that introducing
percpu_ref_alive(). (Tejun)
- adjust comment.
tj: Updated the comment a bit.
Cc: <stable@vger.kernel.org> # 3.15
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/kernfs.h')
0 files changed, 0 insertions, 0 deletions