On Fri, Apr 26, 2013 at 05:37:24AM -0600, Eric Blake wrote:
> On 04/26/2013 04:45 AM, Daniel P. Berrange wrote:
> > From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
> >
> > If a user cgroup name begins with "cgroup.", "_" or with any of
> > the controllers from /proc/cgroups followed by a dot, then they
> > need to be prefixed with a single underscore. eg if there is
> > an object "cpu.service", then this would end up as "_cpu.service"
> > in the cgroup filesystem tree, however, "waldo.service" would
> > stay "waldo.service", at least as long as nobody comes up with
> > a cgroup controller called "waldo".
>
> Do we also need to consider cgroup names beginning with leading '.'?
Good question, I'm just going to raise that question with the
systemd folks.
> > Since we require a '.XXXX' suffix on all partitions, there is
> > no scope for clashing with the kernel 'tasks' and 'release_agent'
> > files.
> >
> > Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
> > ---
> > src/util/vircgroup.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++
> > tests/vircgroupmock.c | 27 +++++++++++++---
> > tests/vircgrouptest.c | 54 ++++++++++++++++++++++++++++++++
> > 3 files changed, 163 insertions(+), 4 deletions(-)
>
> > #if defined HAVE_MNTENT_H && defined HAVE_GETMNTENT_R
> > +static int virCgroupNeedEscape(const char *path)
>
> NeedsEscape sounds a bit better than NeedEscape, if you want to make the
> tweak.
Yep.
> > +static int virCgroupEscape(char **path)
> > +{
> > + size_t len = strlen(*path);
> > + int rc;
> > +
> > + if ((rc = virCgroupNeedEscape(*path)) <= 0)
> > + return rc;
> > +
>
> From here...
>
> > + if (VIR_REALLOC_N(*path, len + 2) < 0)
> > + return -ENOMEM;
> > +
> > + memmove((*path) + 1,
> > + *path,
> > + len + 1);
> > + (*path)[0] = '_';
>
> ...to here could be simplified to:
>
> char escape = '_';
> VIR_INSERT_ELEMENT(*path, 0, len, escape);
Oooh, very clever !
Daniel
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