On Thu, Oct 17, 2019 at 12:00:28PM -0300, Carlos Neira wrote:
> ns_match returns true if the namespace inode and dev_t matches the ones
> provided by the caller.
>
> Signed-off-by: Carlos Neira <cneirabustos@xxxxxxxxx>
> ---
> fs/nsfs.c | 8 ++++++++
> include/linux/proc_ns.h | 2 ++
> 2 files changed, 10 insertions(+)
>
> diff --git a/fs/nsfs.c b/fs/nsfs.c
> index a0431642c6b5..256f6295d33d 100644
> --- a/fs/nsfs.c
> +++ b/fs/nsfs.c
> @@ -245,6 +245,14 @@ struct file *proc_ns_fget(int fd)
> return ERR_PTR(-EINVAL);
> }
>
> +/* Returns true if current namespace matches dev/ino.
> + */
The above could be a single line comment.
Perhaps using kdoc format would be appropriate here.
> +bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino)
> +{
> + return ((ns->inum == ino) && (nsfs_mnt->mnt_sb->s_dev == dev));
The parentheses on the line above seem unnecessary.
> +}
> +
> +
> static int nsfs_show_path(struct seq_file *seq, struct dentry *dentry)
> {
> struct inode *inode = d_inode(dentry);
> diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
> index d31cb6215905..1da9f33489f3 100644
> --- a/include/linux/proc_ns.h
> +++ b/include/linux/proc_ns.h
> @@ -82,6 +82,8 @@ typedef struct ns_common *ns_get_path_helper_t(void *);
> extern void *ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
> void *private_data);
>
> +extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
> +
> extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
> const struct proc_ns_operations *ns_ops);
> extern void nsfs_init(void);
> --
> 2.20.1
>
