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[RFC PATCH] cgroup namespaces: add a 'nsroot=' mountinfo field

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  [RFC PATCH] cgroup namespaces: add a 'nsroot=' mountinfo field "Serge E. Hallyn" <serge@hallyn.com> - 2016-03-22 00:50 +0100
    Re: [RFC PATCH] cgroup namespaces: add a 'nsroot=' mountinfo field "Serge E. Hallyn" <serge@hallyn.com> - 2016-03-29 03:20 +0200
      Re: [RFC PATCH] cgroup namespaces: add a 'nsroot=' mountinfo field Tejun Heo <tj@kernel.org> - 2016-03-30 21:00 +0200
    Re: [RFC PATCH] cgroup namespaces: add a 'nsroot=' mountinfo field Tycho Andersen <tycho.andersen@canonical.com> - 2016-03-29 16:00 +0200
      Re: [RFC PATCH] cgroup namespaces: add a 'nsroot=' mountinfo field "Serge E. Hallyn" <serge@hallyn.com> - 2016-03-29 22:10 +0200
        [PATCH] cgroup mount: ignore nsroot= "Serge E. Hallyn" <serge@hallyn.com> - 2016-03-30 19:30 +0200
          Re: [PATCH] cgroup mount: ignore nsroot= Tycho Andersen <tycho.andersen@canonical.com> - 2016-03-30 20:10 +0200

#1362227 — [RFC PATCH] cgroup namespaces: add a 'nsroot=' mountinfo field

One practical problem I've found with cgroup namespaces is that there
is no way to disambiguate between a cgroupfs mount which was done in
a cgroup namespace, and a bind mount of a cgroupfs directory.  So
whether I do

unshare --cgroup -- bash -c "mount -t cgroup -o freezer f /mnt; cat /proc/self/mountinfo"

or whether I just

mount --bind /sys/fs/cgroup/freezer/$(awk -F: '/freezer/ { print $3 }' /proc/self/cgroup) /mnt

'mount root' field (field 3) in /proc/self/mountinfo will show the
same thing, the result of awk -F: '/freezer/ { print $3 }' /proc/self/cgroup.

This patch adds a 'nsroot=' field to cgroup mountinfo entries, so that
userspace can distinguish a mount made in a cgroup namespace from a bind
mount from a cgroup subdirectory.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
---
 fs/kernfs/mount.c      |  2 +-
 include/linux/kernfs.h |  3 ++-
 kernel/cgroup.c        | 29 ++++++++++++++++++++++++++++-
 3 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index b67dbcc..58f59fd 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -36,7 +36,7 @@ static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)
 	struct kernfs_syscall_ops *scops = root->syscall_ops;
 
 	if (scops && scops->show_options)
-		return scops->show_options(sf, root);
+		return scops->show_options(sf, dentry, root);
 	return 0;
 }
 
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index c06c442..3124b91 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -145,7 +145,8 @@ struct kernfs_node {
  */
 struct kernfs_syscall_ops {
 	int (*remount_fs)(struct kernfs_root *root, int *flags, char *data);
-	int (*show_options)(struct seq_file *sf, struct kernfs_root *root);
+	int (*show_options)(struct seq_file *sf, struct dentry *dentry,
+			    struct kernfs_root *root);
 
 	int (*mkdir)(struct kernfs_node *parent, const char *name,
 		     umode_t mode);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 671dc05..806d1e7 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1593,7 +1593,32 @@ static int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask)
 	return 0;
 }
 
-static int cgroup_show_options(struct seq_file *seq,
+static void cgroup_show_nsroot(struct seq_file *seq, struct dentry *dentry,
+			       struct kernfs_root *kf_root)
+{
+	struct kernfs_node *d_kn = dentry->d_fsdata;
+	char *nsroot;
+	int len, ret;
+
+	if (!kf_root)
+		return;
+	len = kernfs_path_from_node(d_kn, kf_root->kn, NULL, 0);
+	if (len <= 0)
+		return;
+	nsroot = kzalloc(len + 1, GFP_ATOMIC);
+	if (!nsroot)
+		return;
+	ret = kernfs_path_from_node(d_kn, kf_root->kn, nsroot, len + 1);
+	if (ret <= 0 || ret > len)
+		goto out;
+
+	seq_show_option(seq, "nsroot", nsroot);
+
+out:
+	kfree(nsroot);
+}
+
+static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry,
 			       struct kernfs_root *kf_root)
 {
 	struct cgroup_root *root = cgroup_root_from_kf(kf_root);
@@ -1619,6 +1644,8 @@ static int cgroup_show_options(struct seq_file *seq,
 		seq_puts(seq, ",clone_children");
 	if (strlen(root->name))
 		seq_show_option(seq, "name", root->name);
+	cgroup_show_nsroot(seq, dentry, kf_root);
+
 	return 0;
 }
 
-- 
2.7.3

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#1365758

Quoting Serge E. Hallyn (serge@hallyn.com):
> One practical problem I've found with cgroup namespaces is that there
> is no way to disambiguate between a cgroupfs mount which was done in
> a cgroup namespace, and a bind mount of a cgroupfs directory.  So
> whether I do
> 
> unshare --cgroup -- bash -c "mount -t cgroup -o freezer f /mnt; cat /proc/self/mountinfo"
> 
> or whether I just
> 
> mount --bind /sys/fs/cgroup/freezer/$(awk -F: '/freezer/ { print $3 }' /proc/self/cgroup) /mnt
> 
> 'mount root' field (field 3) in /proc/self/mountinfo will show the
> same thing, the result of awk -F: '/freezer/ { print $3 }' /proc/self/cgroup.
> 
> This patch adds a 'nsroot=' field to cgroup mountinfo entries, so that
> userspace can distinguish a mount made in a cgroup namespace from a bind
> mount from a cgroup subdirectory.

Hi Tejun,

no rush on the patch itself, I don't mind if i have to rewrite it from
scratch, but I'd like to get the patch into docker/libcontainer using it,
so can we decide on whether the syntax as shown here is ok?

thanks,
-serge

> Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
> ---
>  fs/kernfs/mount.c      |  2 +-
>  include/linux/kernfs.h |  3 ++-
>  kernel/cgroup.c        | 29 ++++++++++++++++++++++++++++-
>  3 files changed, 31 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
> index b67dbcc..58f59fd 100644
> --- a/fs/kernfs/mount.c
> +++ b/fs/kernfs/mount.c
> @@ -36,7 +36,7 @@ static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)
>  	struct kernfs_syscall_ops *scops = root->syscall_ops;
>  
>  	if (scops && scops->show_options)
> -		return scops->show_options(sf, root);
> +		return scops->show_options(sf, dentry, root);
>  	return 0;
>  }
>  
> diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
> index c06c442..3124b91 100644
> --- a/include/linux/kernfs.h
> +++ b/include/linux/kernfs.h
> @@ -145,7 +145,8 @@ struct kernfs_node {
>   */
>  struct kernfs_syscall_ops {
>  	int (*remount_fs)(struct kernfs_root *root, int *flags, char *data);
> -	int (*show_options)(struct seq_file *sf, struct kernfs_root *root);
> +	int (*show_options)(struct seq_file *sf, struct dentry *dentry,
> +			    struct kernfs_root *root);
>  
>  	int (*mkdir)(struct kernfs_node *parent, const char *name,
>  		     umode_t mode);
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 671dc05..806d1e7 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -1593,7 +1593,32 @@ static int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask)
>  	return 0;
>  }
>  
> -static int cgroup_show_options(struct seq_file *seq,
> +static void cgroup_show_nsroot(struct seq_file *seq, struct dentry *dentry,
> +			       struct kernfs_root *kf_root)
> +{
> +	struct kernfs_node *d_kn = dentry->d_fsdata;
> +	char *nsroot;
> +	int len, ret;
> +
> +	if (!kf_root)
> +		return;
> +	len = kernfs_path_from_node(d_kn, kf_root->kn, NULL, 0);
> +	if (len <= 0)
> +		return;
> +	nsroot = kzalloc(len + 1, GFP_ATOMIC);
> +	if (!nsroot)
> +		return;
> +	ret = kernfs_path_from_node(d_kn, kf_root->kn, nsroot, len + 1);
> +	if (ret <= 0 || ret > len)
> +		goto out;
> +
> +	seq_show_option(seq, "nsroot", nsroot);
> +
> +out:
> +	kfree(nsroot);
> +}
> +
> +static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry,
>  			       struct kernfs_root *kf_root)
>  {
>  	struct cgroup_root *root = cgroup_root_from_kf(kf_root);
> @@ -1619,6 +1644,8 @@ static int cgroup_show_options(struct seq_file *seq,
>  		seq_puts(seq, ",clone_children");
>  	if (strlen(root->name))
>  		seq_show_option(seq, "name", root->name);
> +	cgroup_show_nsroot(seq, dentry, kf_root);
> +
>  	return 0;
>  }
>  
> -- 
> 2.7.3
> 

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#1367522

Hello, Serge.

On Mon, Mar 28, 2016 at 08:12:03PM -0500, Serge E. Hallyn wrote:
> Quoting Serge E. Hallyn (serge@hallyn.com):
> > One practical problem I've found with cgroup namespaces is that there
> > is no way to disambiguate between a cgroupfs mount which was done in
> > a cgroup namespace, and a bind mount of a cgroupfs directory.  So
> > whether I do
> > 
> > unshare --cgroup -- bash -c "mount -t cgroup -o freezer f /mnt; cat /proc/self/mountinfo"
> > 
> > or whether I just
> > 
> > mount --bind /sys/fs/cgroup/freezer/$(awk -F: '/freezer/ { print $3 }' /proc/self/cgroup) /mnt
> > 
> > 'mount root' field (field 3) in /proc/self/mountinfo will show the
> > same thing, the result of awk -F: '/freezer/ { print $3 }' /proc/self/cgroup.
> > 
> > This patch adds a 'nsroot=' field to cgroup mountinfo entries, so that
> > userspace can distinguish a mount made in a cgroup namespace from a bind
> > mount from a cgroup subdirectory.
> 
> no rush on the patch itself, I don't mind if i have to rewrite it from
> scratch, but I'd like to get the patch into docker/libcontainer using it,
> so can we decide on whether the syntax as shown here is ok?

Yeah, I think the syntax is fine.

Thanks.

-- 
tejun

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#1366307

Hi Serge,

On Mon, Mar 21, 2016 at 06:41:33PM -0500, Serge E. Hallyn wrote:
> One practical problem I've found with cgroup namespaces is that there
> is no way to disambiguate between a cgroupfs mount which was done in
> a cgroup namespace, and a bind mount of a cgroupfs directory.  So
> whether I do
> 
> unshare --cgroup -- bash -c "mount -t cgroup -o freezer f /mnt; cat /proc/self/mountinfo"
> 
> or whether I just
> 
> mount --bind /sys/fs/cgroup/freezer/$(awk -F: '/freezer/ { print $3 }' /proc/self/cgroup) /mnt
> 
> 'mount root' field (field 3) in /proc/self/mountinfo will show the
> same thing, the result of awk -F: '/freezer/ { print $3 }' /proc/self/cgroup.
> 
> This patch adds a 'nsroot=' field to cgroup mountinfo entries, so that
> userspace can distinguish a mount made in a cgroup namespace from a bind
> mount from a cgroup subdirectory.

With this patch, mountinfo shows nsroot= in the mount options, but the
actual mount() call for cgroups doesn't allow nsroot. Would it be
possible to allow passing nsroot= to mount, as long is it does in fact
match the current nsroot?

The motivation for this is that CRIU just copies the mount options and
uses them on restore, so with this patch we have to add a special case
to trim off nsroot= before we restore.

Tycho

> Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
> ---
>  fs/kernfs/mount.c      |  2 +-
>  include/linux/kernfs.h |  3 ++-
>  kernel/cgroup.c        | 29 ++++++++++++++++++++++++++++-
>  3 files changed, 31 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
> index b67dbcc..58f59fd 100644
> --- a/fs/kernfs/mount.c
> +++ b/fs/kernfs/mount.c
> @@ -36,7 +36,7 @@ static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)
>  	struct kernfs_syscall_ops *scops = root->syscall_ops;
>  
>  	if (scops && scops->show_options)
> -		return scops->show_options(sf, root);
> +		return scops->show_options(sf, dentry, root);
>  	return 0;
>  }
>  
> diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
> index c06c442..3124b91 100644
> --- a/include/linux/kernfs.h
> +++ b/include/linux/kernfs.h
> @@ -145,7 +145,8 @@ struct kernfs_node {
>   */
>  struct kernfs_syscall_ops {
>  	int (*remount_fs)(struct kernfs_root *root, int *flags, char *data);
> -	int (*show_options)(struct seq_file *sf, struct kernfs_root *root);
> +	int (*show_options)(struct seq_file *sf, struct dentry *dentry,
> +			    struct kernfs_root *root);
>  
>  	int (*mkdir)(struct kernfs_node *parent, const char *name,
>  		     umode_t mode);
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 671dc05..806d1e7 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -1593,7 +1593,32 @@ static int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask)
>  	return 0;
>  }
>  
> -static int cgroup_show_options(struct seq_file *seq,
> +static void cgroup_show_nsroot(struct seq_file *seq, struct dentry *dentry,
> +			       struct kernfs_root *kf_root)
> +{
> +	struct kernfs_node *d_kn = dentry->d_fsdata;
> +	char *nsroot;
> +	int len, ret;
> +
> +	if (!kf_root)
> +		return;
> +	len = kernfs_path_from_node(d_kn, kf_root->kn, NULL, 0);
> +	if (len <= 0)
> +		return;
> +	nsroot = kzalloc(len + 1, GFP_ATOMIC);
> +	if (!nsroot)
> +		return;
> +	ret = kernfs_path_from_node(d_kn, kf_root->kn, nsroot, len + 1);
> +	if (ret <= 0 || ret > len)
> +		goto out;
> +
> +	seq_show_option(seq, "nsroot", nsroot);
> +
> +out:
> +	kfree(nsroot);
> +}
> +
> +static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry,
>  			       struct kernfs_root *kf_root)
>  {
>  	struct cgroup_root *root = cgroup_root_from_kf(kf_root);
> @@ -1619,6 +1644,8 @@ static int cgroup_show_options(struct seq_file *seq,
>  		seq_puts(seq, ",clone_children");
>  	if (strlen(root->name))
>  		seq_show_option(seq, "name", root->name);
> +	cgroup_show_nsroot(seq, dentry, kf_root);
> +
>  	return 0;
>  }
>  
> -- 
> 2.7.3
> 

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#1366625

Quoting Tycho Andersen (tycho.andersen@canonical.com):
> Hi Serge,
> 
> On Mon, Mar 21, 2016 at 06:41:33PM -0500, Serge E. Hallyn wrote:
> > One practical problem I've found with cgroup namespaces is that there
> > is no way to disambiguate between a cgroupfs mount which was done in
> > a cgroup namespace, and a bind mount of a cgroupfs directory.  So
> > whether I do
> > 
> > unshare --cgroup -- bash -c "mount -t cgroup -o freezer f /mnt; cat /proc/self/mountinfo"
> > 
> > or whether I just
> > 
> > mount --bind /sys/fs/cgroup/freezer/$(awk -F: '/freezer/ { print $3 }' /proc/self/cgroup) /mnt
> > 
> > 'mount root' field (field 3) in /proc/self/mountinfo will show the
> > same thing, the result of awk -F: '/freezer/ { print $3 }' /proc/self/cgroup.
> > 
> > This patch adds a 'nsroot=' field to cgroup mountinfo entries, so that
> > userspace can distinguish a mount made in a cgroup namespace from a bind
> > mount from a cgroup subdirectory.
> 
> With this patch, mountinfo shows nsroot= in the mount options, but the
> actual mount() call for cgroups doesn't allow nsroot. Would it be
> possible to allow passing nsroot= to mount, as long is it does in fact
> match the current nsroot?

Yeah, that should be possible.  I'll try to send a patch for that later
this week.  That's not to say Tejun will be ok with the behavior, but
it seems to make sense to me.

> The motivation for this is that CRIU just copies the mount options and
> uses them on restore, so with this patch we have to add a special case
> to trim off nsroot= before we restore.
> 
> Tycho
> 
> > Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
> > ---
> >  fs/kernfs/mount.c      |  2 +-
> >  include/linux/kernfs.h |  3 ++-
> >  kernel/cgroup.c        | 29 ++++++++++++++++++++++++++++-
> >  3 files changed, 31 insertions(+), 3 deletions(-)
> > 
> > diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
> > index b67dbcc..58f59fd 100644
> > --- a/fs/kernfs/mount.c
> > +++ b/fs/kernfs/mount.c
> > @@ -36,7 +36,7 @@ static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)
> >  	struct kernfs_syscall_ops *scops = root->syscall_ops;
> >  
> >  	if (scops && scops->show_options)
> > -		return scops->show_options(sf, root);
> > +		return scops->show_options(sf, dentry, root);
> >  	return 0;
> >  }
> >  
> > diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
> > index c06c442..3124b91 100644
> > --- a/include/linux/kernfs.h
> > +++ b/include/linux/kernfs.h
> > @@ -145,7 +145,8 @@ struct kernfs_node {
> >   */
> >  struct kernfs_syscall_ops {
> >  	int (*remount_fs)(struct kernfs_root *root, int *flags, char *data);
> > -	int (*show_options)(struct seq_file *sf, struct kernfs_root *root);
> > +	int (*show_options)(struct seq_file *sf, struct dentry *dentry,
> > +			    struct kernfs_root *root);
> >  
> >  	int (*mkdir)(struct kernfs_node *parent, const char *name,
> >  		     umode_t mode);
> > diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> > index 671dc05..806d1e7 100644
> > --- a/kernel/cgroup.c
> > +++ b/kernel/cgroup.c
> > @@ -1593,7 +1593,32 @@ static int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask)
> >  	return 0;
> >  }
> >  
> > -static int cgroup_show_options(struct seq_file *seq,
> > +static void cgroup_show_nsroot(struct seq_file *seq, struct dentry *dentry,
> > +			       struct kernfs_root *kf_root)
> > +{
> > +	struct kernfs_node *d_kn = dentry->d_fsdata;
> > +	char *nsroot;
> > +	int len, ret;
> > +
> > +	if (!kf_root)
> > +		return;
> > +	len = kernfs_path_from_node(d_kn, kf_root->kn, NULL, 0);
> > +	if (len <= 0)
> > +		return;
> > +	nsroot = kzalloc(len + 1, GFP_ATOMIC);
> > +	if (!nsroot)
> > +		return;
> > +	ret = kernfs_path_from_node(d_kn, kf_root->kn, nsroot, len + 1);
> > +	if (ret <= 0 || ret > len)
> > +		goto out;
> > +
> > +	seq_show_option(seq, "nsroot", nsroot);
> > +
> > +out:
> > +	kfree(nsroot);
> > +}
> > +
> > +static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry,
> >  			       struct kernfs_root *kf_root)
> >  {
> >  	struct cgroup_root *root = cgroup_root_from_kf(kf_root);
> > @@ -1619,6 +1644,8 @@ static int cgroup_show_options(struct seq_file *seq,
> >  		seq_puts(seq, ",clone_children");
> >  	if (strlen(root->name))
> >  		seq_show_option(seq, "name", root->name);
> > +	cgroup_show_nsroot(seq, dentry, kf_root);
> > +
> >  	return 0;
> >  }
> >  
> > -- 
> > 2.7.3
> > 

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#1367481 — [PATCH] cgroup mount: ignore nsroot=

As of the patch "cgroup namespaces: add a 'nsroot=' mountinfo field", 
cgroupfs mountinfo output shows 'nsroot='.  If userspace like criu
copy/pastes mount options from there into a new mount command, we should
ignore it.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
---
 kernel/cgroup.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index ef0c25d..69fb112 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1680,6 +1680,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
 			opts->none = true;
 			continue;
 		}
+		if (!strncmp(token, "nsroot=", 7)) {
+			/* ignore nsroot= copied from mountinfo */
+			continue;
+		}
 		if (!strcmp(token, "all")) {
 			/* Mutually exclusive option 'all' + subsystem name */
 			if (one_ss)
-- 
2.7.0

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#1367504 — Re: [PATCH] cgroup mount: ignore nsroot=

On Wed, Mar 30, 2016 at 12:21:00PM -0500, Serge E. Hallyn wrote:
> As of the patch "cgroup namespaces: add a 'nsroot=' mountinfo field", 
> cgroupfs mountinfo output shows 'nsroot='.  If userspace like criu
> copy/pastes mount options from there into a new mount command, we should
> ignore it.
> 
> Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

Tested-by: Tycho Andersen <tycho.andersen@canonical.com>

Thanks, Serge.

> ---
>  kernel/cgroup.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index ef0c25d..69fb112 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -1680,6 +1680,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
>  			opts->none = true;
>  			continue;
>  		}
> +		if (!strncmp(token, "nsroot=", 7)) {
> +			/* ignore nsroot= copied from mountinfo */
> +			continue;
> +		}
>  		if (!strcmp(token, "all")) {
>  			/* Mutually exclusive option 'all' + subsystem name */
>  			if (one_ss)
> -- 
> 2.7.0
> 

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