Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
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: <[email protected]> # 3.15 Signed-off-by: Li Zefan <[email protected]> Signed-off-by: Tejun Heo <[email protected]>
- Loading branch information