Messages in this thread | | | Date | Thu, 10 Apr 2008 13:10:30 -0700 | From | "Paul Menage" <> | Subject | Re: [RFC] Control Groups Roadmap ideas |
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On Tue, Apr 8, 2008 at 7:28 PM, Li Zefan <lizf@cn.fujitsu.com> wrote: > > Sounds good, and I wrote a prototype in a quick:
Yes, that's pretty much what I was envisaging, thanks.
Paul
> > diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h > index a6a6035..091bc21 100644 > --- a/include/linux/cgroup.h > +++ b/include/linux/cgroup.h > @@ -254,6 +254,7 @@ struct cgroup_subsys { > struct cgroup *cgrp); > void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp); > void (*bind)(struct cgroup_subsys *ss, struct cgroup *root); > + int (*can_mount)(struct cgroup_subsys *ss, unsigned long subsys_bits); > int subsys_id; > int active; > int disabled; > diff --git a/kernel/cgroup.c b/kernel/cgroup.c > index 62f1a52..3d43ff2 100644 > --- a/kernel/cgroup.c > +++ b/kernel/cgroup.c > @@ -824,6 +824,25 @@ static int parse_cgroupfs_options(char *data, > return 0; > } > > +static int check_mount(unsigned long subsys_bits) > +{ > + int i; > + int ret; > + struct cgroup_subsys *ss; > + > + for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) { > + ss = subsys[i]; > + > + if (test_bit(i, &subsys_bits) && ss->can_mount) { > + ret = ss->can_mount(ss, subsys_bits); > + if (ret) > + return ret; > + } > + } > + > + return 0; > +} > + > static int cgroup_remount(struct super_block *sb, int *flags, char *data) > { > int ret = 0; > @@ -839,6 +858,10 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data) > if (ret) > goto out_unlock; > > + ret = check_mount(opts.subsys_bits); > + if (ret) > + goto out_unlock; > + > /* Don't allow flags to change at remount */ > if (opts.flags != root->flags) { > ret = -EINVAL; > @@ -959,6 +982,13 @@ static int cgroup_get_sb(struct file_system_type *fs_type, > return ret; > } > > + ret = check_mount(opts.subsys_bits); > + if (ret) { > + if (opts.release_agent) > + kfree(opts.release_agent); > + return ret; > + } > + > root = kzalloc(sizeof(*root), GFP_KERNEL); > if (!root) { > if (opts.release_agent) > ------- > > for the example about swap controller and memory controller: > > static int swap_cgroup_can_mount(struct cgroup_subsys *ss, > unsigned long subsys_bits) > { > if (!test_bit(mem_cgroup_subsys_id, &subsys_bits)) > return -EINVAL; > return 0; > } > > 'mem_cgroup_subsys_id' is a member of enum cgroup_subsys_id defined in cgroup.h >
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