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| author |   Tejun Heo <tj@kernel.org> | 2018-12-28 10:31:07 -0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2018-12-28 10:34:12 -0800 |
| commit | 3fc9c12d27b4ded4f1f761a800558dab2e6bbac5 (patch) | |
| tree | 93db5bb4c9028449057db754f83058bb7593aefa /kernel/cgroup/cgroup-v1.c | |
| parent | cgroup: fix parsing empty mount option string (diff) | |
| download | wireguard-linux-3fc9c12d27b4ded4f1f761a800558dab2e6bbac5.tar.xz wireguard-linux-3fc9c12d27b4ded4f1f761a800558dab2e6bbac5.zip | |
cgroup: Add named hierarchy disabling to cgroup_no_v1 boot param
It can be useful to inhibit all cgroup1 hierarchies especially during
transition and for debugging. cgroup_no_v1 can block hierarchies with
controllers which leaves out the named hierarchies. Expand it to
cover the named hierarchies so that "cgroup_no_v1=all,named" disables
all cgroup1 hierarchies.
Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Marcin Pawlowski <mpawlowski@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup/cgroup-v1.c')
| -rw-r--r-- | kernel/cgroup/cgroup-v1.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c index 51063e7a93c2..583b969b0c0e 100644 --- a/kernel/cgroup/cgroup-v1.c +++ b/kernel/cgroup/cgroup-v1.c @@ -27,6 +27,9 @@ /* Controllers blocked by the commandline in v1 */ static u16 cgroup_no_v1_mask; +/* disable named v1 mounts */ +static bool cgroup_no_v1_named; + /* * pidlist destructions need to be flushed on cgroup destruction. Use a * separate workqueue as flush domain. @@ -963,6 +966,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts) } if (!strncmp(token, "name=", 5)) { const char *name = token + 5; + + /* blocked by boot param? */ + if (cgroup_no_v1_named) + return -ENOENT; /* Can't specify an empty name */ if (!strlen(name)) return -EINVAL; @@ -1292,7 +1299,12 @@ static int __init cgroup_no_v1(char *str) if (!strcmp(token, "all")) { cgroup_no_v1_mask = U16_MAX; - break; + continue; + } + + if (!strcmp(token, "named")) { + cgroup_no_v1_named = true; + continue; } for_each_subsys(ss, i) { |