diff options
| author | Josef Bacik <josef@toxicpanda.com> | 2024-06-24 11:49:50 -0400 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-06-28 09:53:31 +0200 |
| commit | e8e43a1fcc5c07575f37e40f8a2cd78aee46f9a0 (patch) | |
| tree | 58c23b611a71a68ce96cd91acd984c910960e460 /fs/nsfs.c | |
| parent | 71aacb4c8c3d19da053363a5fe7538a8af082d56 (diff) | |
fs: add an ioctl to get the mnt ns id from nsfs
In order to utilize the listmount() and statmount() extensions that
allow us to call them on different namespaces we need a way to get the
mnt namespace id from user space. Add an ioctl to nsfs that will allow
us to extract the mnt namespace id in order to make these new extensions
usable.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/180449959d5a756af7306d6bda55f41b9d53e3cb.1719243756.git.josef@toxicpanda.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/nsfs.c')
| -rw-r--r-- | fs/nsfs.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/nsfs.c b/fs/nsfs.c index 07e22a15ef02..af352dadffe1 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -12,6 +12,7 @@ #include <linux/nsfs.h> #include <linux/uaccess.h> +#include "mount.h" #include "internal.h" static struct vfsmount *nsfs_mnt; @@ -143,6 +144,19 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl, argp = (uid_t __user *) arg; uid = from_kuid_munged(current_user_ns(), user_ns->owner); return put_user(uid, argp); + case NS_GET_MNTNS_ID: { + struct mnt_namespace *mnt_ns; + __u64 __user *idp; + __u64 id; + + if (ns->ops->type != CLONE_NEWNS) + return -EINVAL; + + mnt_ns = container_of(ns, struct mnt_namespace, ns); + idp = (__u64 __user *)arg; + id = mnt_ns->seq; + return put_user(id, idp); + } default: return -ENOTTY; } |